1 /*
2 * Copyright (c) 2016, 2022, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2016, 2019 SAP SE. All rights reserved.
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This code is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 only, as
8 * published by the Free Software Foundation.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 *
24 */
25
26 #include "precompiled.hpp"
27 #include "asm/codeBuffer.hpp"
28 #include "asm/macroAssembler.inline.hpp"
29 #include "compiler/disassembler.hpp"
30 #include "gc/shared/barrierSet.hpp"
31 #include "gc/shared/barrierSetAssembler.hpp"
32 #include "gc/shared/collectedHeap.inline.hpp"
33 #include "interpreter/interpreter.hpp"
34 #include "gc/shared/cardTableBarrierSet.hpp"
35 #include "memory/resourceArea.hpp"
36 #include "memory/universe.hpp"
37 #include "oops/accessDecorators.hpp"
38 #include "oops/compressedKlass.inline.hpp"
39 #include "oops/compressedOops.inline.hpp"
40 #include "oops/klass.inline.hpp"
41 #include "prims/methodHandles.hpp"
42 #include "registerSaver_s390.hpp"
43 #include "runtime/icache.hpp"
44 #include "runtime/interfaceSupport.inline.hpp"
45 #include "runtime/objectMonitor.hpp"
46 #include "runtime/os.hpp"
47 #include "runtime/safepoint.hpp"
48 #include "runtime/safepointMechanism.hpp"
49 #include "runtime/sharedRuntime.hpp"
50 #include "runtime/stubRoutines.hpp"
51 #include "utilities/events.hpp"
52 #include "utilities/macros.hpp"
53 #include "utilities/powerOfTwo.hpp"
54
55 #include <ucontext.h>
56
57 #define BLOCK_COMMENT(str) block_comment(str)
58 #define BIND(label) bind(label); BLOCK_COMMENT(#label ":")
59
60 // Move 32-bit register if destination and source are different.
61 void MacroAssembler::lr_if_needed(Register rd, Register rs) {
62 if (rs != rd) { z_lr(rd, rs); }
63 }
64
65 // Move register if destination and source are different.
66 void MacroAssembler::lgr_if_needed(Register rd, Register rs) {
67 if (rs != rd) { z_lgr(rd, rs); }
68 }
69
70 // Zero-extend 32-bit register into 64-bit register if destination and source are different.
71 void MacroAssembler::llgfr_if_needed(Register rd, Register rs) {
72 if (rs != rd) { z_llgfr(rd, rs); }
73 }
74
75 // Move float register if destination and source are different.
76 void MacroAssembler::ldr_if_needed(FloatRegister rd, FloatRegister rs) {
77 if (rs != rd) { z_ldr(rd, rs); }
78 }
79
80 // Move integer register if destination and source are different.
81 // It is assumed that shorter-than-int types are already
82 // appropriately sign-extended.
83 void MacroAssembler::move_reg_if_needed(Register dst, BasicType dst_type, Register src,
84 BasicType src_type) {
85 assert((dst_type != T_FLOAT) && (dst_type != T_DOUBLE), "use move_freg for float types");
86 assert((src_type != T_FLOAT) && (src_type != T_DOUBLE), "use move_freg for float types");
87
88 if (dst_type == src_type) {
89 lgr_if_needed(dst, src); // Just move all 64 bits.
90 return;
91 }
92
93 switch (dst_type) {
94 // Do not support these types for now.
95 // case T_BOOLEAN:
96 case T_BYTE: // signed byte
97 switch (src_type) {
98 case T_INT:
99 z_lgbr(dst, src);
100 break;
101 default:
102 ShouldNotReachHere();
103 }
104 return;
105
106 case T_CHAR:
107 case T_SHORT:
108 switch (src_type) {
109 case T_INT:
110 if (dst_type == T_CHAR) {
111 z_llghr(dst, src);
112 } else {
113 z_lghr(dst, src);
114 }
115 break;
116 default:
117 ShouldNotReachHere();
118 }
119 return;
120
121 case T_INT:
122 switch (src_type) {
123 case T_BOOLEAN:
124 case T_BYTE:
125 case T_CHAR:
126 case T_SHORT:
127 case T_INT:
128 case T_LONG:
129 case T_OBJECT:
130 case T_ARRAY:
131 case T_VOID:
132 case T_ADDRESS:
133 lr_if_needed(dst, src);
134 // llgfr_if_needed(dst, src); // zero-extend (in case we need to find a bug).
135 return;
136
137 default:
138 assert(false, "non-integer src type");
139 return;
140 }
141 case T_LONG:
142 switch (src_type) {
143 case T_BOOLEAN:
144 case T_BYTE:
145 case T_CHAR:
146 case T_SHORT:
147 case T_INT:
148 z_lgfr(dst, src); // sign extension
149 return;
150
151 case T_LONG:
152 case T_OBJECT:
153 case T_ARRAY:
154 case T_VOID:
155 case T_ADDRESS:
156 lgr_if_needed(dst, src);
157 return;
158
159 default:
160 assert(false, "non-integer src type");
161 return;
162 }
163 return;
164 case T_OBJECT:
165 case T_ARRAY:
166 case T_VOID:
167 case T_ADDRESS:
168 switch (src_type) {
169 // These types don't make sense to be converted to pointers:
170 // case T_BOOLEAN:
171 // case T_BYTE:
172 // case T_CHAR:
173 // case T_SHORT:
174
175 case T_INT:
176 z_llgfr(dst, src); // zero extension
177 return;
178
179 case T_LONG:
180 case T_OBJECT:
181 case T_ARRAY:
182 case T_VOID:
183 case T_ADDRESS:
184 lgr_if_needed(dst, src);
185 return;
186
187 default:
188 assert(false, "non-integer src type");
189 return;
190 }
191 return;
192 default:
193 assert(false, "non-integer dst type");
194 return;
195 }
196 }
197
198 // Move float register if destination and source are different.
199 void MacroAssembler::move_freg_if_needed(FloatRegister dst, BasicType dst_type,
200 FloatRegister src, BasicType src_type) {
201 assert((dst_type == T_FLOAT) || (dst_type == T_DOUBLE), "use move_reg for int types");
202 assert((src_type == T_FLOAT) || (src_type == T_DOUBLE), "use move_reg for int types");
203 if (dst_type == src_type) {
204 ldr_if_needed(dst, src); // Just move all 64 bits.
205 } else {
206 switch (dst_type) {
207 case T_FLOAT:
208 assert(src_type == T_DOUBLE, "invalid float type combination");
209 z_ledbr(dst, src);
210 return;
211 case T_DOUBLE:
212 assert(src_type == T_FLOAT, "invalid float type combination");
213 z_ldebr(dst, src);
214 return;
215 default:
216 assert(false, "non-float dst type");
217 return;
218 }
219 }
220 }
221
222 // Optimized emitter for reg to mem operations.
223 // Uses modern instructions if running on modern hardware, classic instructions
224 // otherwise. Prefers (usually shorter) classic instructions if applicable.
225 // Data register (reg) cannot be used as work register.
226 //
227 // Don't rely on register locking, instead pass a scratch register (Z_R0 by default).
228 // CAUTION! Passing registers >= Z_R2 may produce bad results on old CPUs!
229 void MacroAssembler::freg2mem_opt(FloatRegister reg,
230 int64_t disp,
231 Register index,
232 Register base,
233 void (MacroAssembler::*modern) (FloatRegister, int64_t, Register, Register),
234 void (MacroAssembler::*classic)(FloatRegister, int64_t, Register, Register),
235 Register scratch) {
236 index = (index == noreg) ? Z_R0 : index;
237 if (Displacement::is_shortDisp(disp)) {
238 (this->*classic)(reg, disp, index, base);
239 } else {
240 if (Displacement::is_validDisp(disp)) {
241 (this->*modern)(reg, disp, index, base);
242 } else {
243 if (scratch != Z_R0 && scratch != Z_R1) {
244 (this->*modern)(reg, disp, index, base); // Will fail with disp out of range.
245 } else {
246 if (scratch != Z_R0) { // scratch == Z_R1
247 if ((scratch == index) || (index == base)) {
248 (this->*modern)(reg, disp, index, base); // Will fail with disp out of range.
249 } else {
250 add2reg(scratch, disp, base);
251 (this->*classic)(reg, 0, index, scratch);
252 if (base == scratch) {
253 add2reg(base, -disp); // Restore base.
254 }
255 }
256 } else { // scratch == Z_R0
257 z_lgr(scratch, base);
258 add2reg(base, disp);
259 (this->*classic)(reg, 0, index, base);
260 z_lgr(base, scratch); // Restore base.
261 }
262 }
263 }
264 }
265 }
266
267 void MacroAssembler::freg2mem_opt(FloatRegister reg, const Address &a, bool is_double) {
268 if (is_double) {
269 freg2mem_opt(reg, a.disp20(), a.indexOrR0(), a.baseOrR0(), MODERN_FFUN(z_stdy), CLASSIC_FFUN(z_std));
270 } else {
271 freg2mem_opt(reg, a.disp20(), a.indexOrR0(), a.baseOrR0(), MODERN_FFUN(z_stey), CLASSIC_FFUN(z_ste));
272 }
273 }
274
275 // Optimized emitter for mem to reg operations.
276 // Uses modern instructions if running on modern hardware, classic instructions
277 // otherwise. Prefers (usually shorter) classic instructions if applicable.
278 // data register (reg) cannot be used as work register.
279 //
280 // Don't rely on register locking, instead pass a scratch register (Z_R0 by default).
281 // CAUTION! Passing registers >= Z_R2 may produce bad results on old CPUs!
282 void MacroAssembler::mem2freg_opt(FloatRegister reg,
283 int64_t disp,
284 Register index,
285 Register base,
286 void (MacroAssembler::*modern) (FloatRegister, int64_t, Register, Register),
287 void (MacroAssembler::*classic)(FloatRegister, int64_t, Register, Register),
288 Register scratch) {
289 index = (index == noreg) ? Z_R0 : index;
290 if (Displacement::is_shortDisp(disp)) {
291 (this->*classic)(reg, disp, index, base);
292 } else {
293 if (Displacement::is_validDisp(disp)) {
294 (this->*modern)(reg, disp, index, base);
295 } else {
296 if (scratch != Z_R0 && scratch != Z_R1) {
297 (this->*modern)(reg, disp, index, base); // Will fail with disp out of range.
298 } else {
299 if (scratch != Z_R0) { // scratch == Z_R1
300 if ((scratch == index) || (index == base)) {
301 (this->*modern)(reg, disp, index, base); // Will fail with disp out of range.
302 } else {
303 add2reg(scratch, disp, base);
304 (this->*classic)(reg, 0, index, scratch);
305 if (base == scratch) {
306 add2reg(base, -disp); // Restore base.
307 }
308 }
309 } else { // scratch == Z_R0
310 z_lgr(scratch, base);
311 add2reg(base, disp);
312 (this->*classic)(reg, 0, index, base);
313 z_lgr(base, scratch); // Restore base.
314 }
315 }
316 }
317 }
318 }
319
320 void MacroAssembler::mem2freg_opt(FloatRegister reg, const Address &a, bool is_double) {
321 if (is_double) {
322 mem2freg_opt(reg, a.disp20(), a.indexOrR0(), a.baseOrR0(), MODERN_FFUN(z_ldy), CLASSIC_FFUN(z_ld));
323 } else {
324 mem2freg_opt(reg, a.disp20(), a.indexOrR0(), a.baseOrR0(), MODERN_FFUN(z_ley), CLASSIC_FFUN(z_le));
325 }
326 }
327
328 // Optimized emitter for reg to mem operations.
329 // Uses modern instructions if running on modern hardware, classic instructions
330 // otherwise. Prefers (usually shorter) classic instructions if applicable.
331 // Data register (reg) cannot be used as work register.
332 //
333 // Don't rely on register locking, instead pass a scratch register
334 // (Z_R0 by default)
335 // CAUTION! passing registers >= Z_R2 may produce bad results on old CPUs!
336 void MacroAssembler::reg2mem_opt(Register reg,
337 int64_t disp,
338 Register index,
339 Register base,
340 void (MacroAssembler::*modern) (Register, int64_t, Register, Register),
341 void (MacroAssembler::*classic)(Register, int64_t, Register, Register),
342 Register scratch) {
343 index = (index == noreg) ? Z_R0 : index;
344 if (Displacement::is_shortDisp(disp)) {
345 (this->*classic)(reg, disp, index, base);
346 } else {
347 if (Displacement::is_validDisp(disp)) {
348 (this->*modern)(reg, disp, index, base);
349 } else {
350 if (scratch != Z_R0 && scratch != Z_R1) {
351 (this->*modern)(reg, disp, index, base); // Will fail with disp out of range.
352 } else {
353 if (scratch != Z_R0) { // scratch == Z_R1
354 if ((scratch == index) || (index == base)) {
355 (this->*modern)(reg, disp, index, base); // Will fail with disp out of range.
356 } else {
357 add2reg(scratch, disp, base);
358 (this->*classic)(reg, 0, index, scratch);
359 if (base == scratch) {
360 add2reg(base, -disp); // Restore base.
361 }
362 }
363 } else { // scratch == Z_R0
364 if ((scratch == reg) || (scratch == base) || (reg == base)) {
365 (this->*modern)(reg, disp, index, base); // Will fail with disp out of range.
366 } else {
367 z_lgr(scratch, base);
368 add2reg(base, disp);
369 (this->*classic)(reg, 0, index, base);
370 z_lgr(base, scratch); // Restore base.
371 }
372 }
373 }
374 }
375 }
376 }
377
378 int MacroAssembler::reg2mem_opt(Register reg, const Address &a, bool is_double) {
379 int store_offset = offset();
380 if (is_double) {
381 reg2mem_opt(reg, a.disp20(), a.indexOrR0(), a.baseOrR0(), MODERN_IFUN(z_stg), CLASSIC_IFUN(z_stg));
382 } else {
383 reg2mem_opt(reg, a.disp20(), a.indexOrR0(), a.baseOrR0(), MODERN_IFUN(z_sty), CLASSIC_IFUN(z_st));
384 }
385 return store_offset;
386 }
387
388 // Optimized emitter for mem to reg operations.
389 // Uses modern instructions if running on modern hardware, classic instructions
390 // otherwise. Prefers (usually shorter) classic instructions if applicable.
391 // Data register (reg) will be used as work register where possible.
392 void MacroAssembler::mem2reg_opt(Register reg,
393 int64_t disp,
394 Register index,
395 Register base,
396 void (MacroAssembler::*modern) (Register, int64_t, Register, Register),
397 void (MacroAssembler::*classic)(Register, int64_t, Register, Register)) {
398 index = (index == noreg) ? Z_R0 : index;
399 if (Displacement::is_shortDisp(disp)) {
400 (this->*classic)(reg, disp, index, base);
401 } else {
402 if (Displacement::is_validDisp(disp)) {
403 (this->*modern)(reg, disp, index, base);
404 } else {
405 if ((reg == index) && (reg == base)) {
406 z_sllg(reg, reg, 1);
407 add2reg(reg, disp);
408 (this->*classic)(reg, 0, noreg, reg);
409 } else if ((reg == index) && (reg != Z_R0)) {
410 add2reg(reg, disp);
411 (this->*classic)(reg, 0, reg, base);
412 } else if (reg == base) {
413 add2reg(reg, disp);
414 (this->*classic)(reg, 0, index, reg);
415 } else if (reg != Z_R0) {
416 add2reg(reg, disp, base);
417 (this->*classic)(reg, 0, index, reg);
418 } else { // reg == Z_R0 && reg != base here
419 add2reg(base, disp);
420 (this->*classic)(reg, 0, index, base);
421 add2reg(base, -disp);
422 }
423 }
424 }
425 }
426
427 void MacroAssembler::mem2reg_opt(Register reg, const Address &a, bool is_double) {
428 if (is_double) {
429 z_lg(reg, a);
430 } else {
431 mem2reg_opt(reg, a.disp20(), a.indexOrR0(), a.baseOrR0(), MODERN_IFUN(z_ly), CLASSIC_IFUN(z_l));
432 }
433 }
434
435 void MacroAssembler::mem2reg_signed_opt(Register reg, const Address &a) {
436 mem2reg_opt(reg, a.disp20(), a.indexOrR0(), a.baseOrR0(), MODERN_IFUN(z_lgf), CLASSIC_IFUN(z_lgf));
437 }
438
439 void MacroAssembler::and_imm(Register r, long mask,
440 Register tmp /* = Z_R0 */,
441 bool wide /* = false */) {
442 assert(wide || Immediate::is_simm32(mask), "mask value too large");
443
444 if (!wide) {
445 z_nilf(r, mask);
446 return;
447 }
448
449 assert(r != tmp, " need a different temporary register !");
450 load_const_optimized(tmp, mask);
451 z_ngr(r, tmp);
452 }
453
454 // Calculate the 1's complement.
455 // Note: The condition code is neither preserved nor correctly set by this code!!!
456 // Note: (wide == false) does not protect the high order half of the target register
457 // from alteration. It only serves as optimization hint for 32-bit results.
458 void MacroAssembler::not_(Register r1, Register r2, bool wide) {
459
460 if ((r2 == noreg) || (r2 == r1)) { // Calc 1's complement in place.
461 z_xilf(r1, -1);
462 if (wide) {
463 z_xihf(r1, -1);
464 }
465 } else { // Distinct src and dst registers.
466 load_const_optimized(r1, -1);
467 z_xgr(r1, r2);
468 }
469 }
470
471 unsigned long MacroAssembler::create_mask(int lBitPos, int rBitPos) {
472 assert(lBitPos >= 0, "zero is leftmost bit position");
473 assert(rBitPos <= 63, "63 is rightmost bit position");
474 assert(lBitPos <= rBitPos, "inverted selection interval");
475 return (lBitPos == 0 ? (unsigned long)(-1L) : ((1UL<<(63-lBitPos+1))-1)) & (~((1UL<<(63-rBitPos))-1));
476 }
477
478 // Helper function for the "Rotate_then_<logicalOP>" emitters.
479 // Rotate src, then mask register contents such that only bits in range survive.
480 // For oneBits == false, all bits not in range are set to 0. Useful for deleting all bits outside range.
481 // For oneBits == true, all bits not in range are set to 1. Useful for preserving all bits outside range.
482 // The caller must ensure that the selected range only contains bits with defined value.
483 void MacroAssembler::rotate_then_mask(Register dst, Register src, int lBitPos, int rBitPos,
484 int nRotate, bool src32bit, bool dst32bit, bool oneBits) {
485 assert(!(dst32bit && lBitPos < 32), "selection interval out of range for int destination");
486 bool sll4rll = (nRotate >= 0) && (nRotate <= (63-rBitPos)); // Substitute SLL(G) for RLL(G).
487 bool srl4rll = (nRotate < 0) && (-nRotate <= lBitPos); // Substitute SRL(G) for RLL(G).
488 // Pre-determine which parts of dst will be zero after shift/rotate.
489 bool llZero = sll4rll && (nRotate >= 16);
490 bool lhZero = (sll4rll && (nRotate >= 32)) || (srl4rll && (nRotate <= -48));
491 bool lfZero = llZero && lhZero;
492 bool hlZero = (sll4rll && (nRotate >= 48)) || (srl4rll && (nRotate <= -32));
493 bool hhZero = (srl4rll && (nRotate <= -16));
494 bool hfZero = hlZero && hhZero;
495
496 // rotate then mask src operand.
497 // if oneBits == true, all bits outside selected range are 1s.
498 // if oneBits == false, all bits outside selected range are 0s.
499 if (src32bit) { // There might be garbage in the upper 32 bits which will get masked away.
500 if (dst32bit) {
501 z_rll(dst, src, nRotate); // Copy and rotate, upper half of reg remains undisturbed.
502 } else {
503 if (sll4rll) { z_sllg(dst, src, nRotate); }
504 else if (srl4rll) { z_srlg(dst, src, -nRotate); }
505 else { z_rllg(dst, src, nRotate); }
506 }
507 } else {
508 if (sll4rll) { z_sllg(dst, src, nRotate); }
509 else if (srl4rll) { z_srlg(dst, src, -nRotate); }
510 else { z_rllg(dst, src, nRotate); }
511 }
512
513 unsigned long range_mask = create_mask(lBitPos, rBitPos);
514 unsigned int range_mask_h = (unsigned int)(range_mask >> 32);
515 unsigned int range_mask_l = (unsigned int)range_mask;
516 unsigned short range_mask_hh = (unsigned short)(range_mask >> 48);
517 unsigned short range_mask_hl = (unsigned short)(range_mask >> 32);
518 unsigned short range_mask_lh = (unsigned short)(range_mask >> 16);
519 unsigned short range_mask_ll = (unsigned short)range_mask;
520 // Works for z9 and newer H/W.
521 if (oneBits) {
522 if ((~range_mask_l) != 0) { z_oilf(dst, ~range_mask_l); } // All bits outside range become 1s.
523 if (((~range_mask_h) != 0) && !dst32bit) { z_oihf(dst, ~range_mask_h); }
524 } else {
525 // All bits outside range become 0s
526 if (((~range_mask_l) != 0) && !lfZero) {
527 z_nilf(dst, range_mask_l);
528 }
529 if (((~range_mask_h) != 0) && !dst32bit && !hfZero) {
530 z_nihf(dst, range_mask_h);
531 }
532 }
533 }
534
535 // Rotate src, then insert selected range from rotated src into dst.
536 // Clear dst before, if requested.
537 void MacroAssembler::rotate_then_insert(Register dst, Register src, int lBitPos, int rBitPos,
538 int nRotate, bool clear_dst) {
539 // This version does not depend on src being zero-extended int2long.
540 nRotate &= 0x003f; // For risbg, pretend it's an unsigned value.
541 z_risbg(dst, src, lBitPos, rBitPos, nRotate, clear_dst); // Rotate, then insert selected, clear the rest.
542 }
543
544 // Rotate src, then and selected range from rotated src into dst.
545 // Set condition code only if so requested. Otherwise it is unpredictable.
546 // See performance note in macroAssembler_s390.hpp for important information.
547 void MacroAssembler::rotate_then_and(Register dst, Register src, int lBitPos, int rBitPos,
548 int nRotate, bool test_only) {
549 guarantee(!test_only, "Emitter not fit for test_only instruction variant.");
550 // This version does not depend on src being zero-extended int2long.
551 nRotate &= 0x003f; // For risbg, pretend it's an unsigned value.
552 z_rxsbg(dst, src, lBitPos, rBitPos, nRotate, test_only); // Rotate, then xor selected.
553 }
554
555 // Rotate src, then or selected range from rotated src into dst.
556 // Set condition code only if so requested. Otherwise it is unpredictable.
557 // See performance note in macroAssembler_s390.hpp for important information.
558 void MacroAssembler::rotate_then_or(Register dst, Register src, int lBitPos, int rBitPos,
559 int nRotate, bool test_only) {
560 guarantee(!test_only, "Emitter not fit for test_only instruction variant.");
561 // This version does not depend on src being zero-extended int2long.
562 nRotate &= 0x003f; // For risbg, pretend it's an unsigned value.
563 z_rosbg(dst, src, lBitPos, rBitPos, nRotate, test_only); // Rotate, then xor selected.
564 }
565
566 // Rotate src, then xor selected range from rotated src into dst.
567 // Set condition code only if so requested. Otherwise it is unpredictable.
568 // See performance note in macroAssembler_s390.hpp for important information.
569 void MacroAssembler::rotate_then_xor(Register dst, Register src, int lBitPos, int rBitPos,
570 int nRotate, bool test_only) {
571 guarantee(!test_only, "Emitter not fit for test_only instruction variant.");
572 // This version does not depend on src being zero-extended int2long.
573 nRotate &= 0x003f; // For risbg, pretend it's an unsigned value.
574 z_rxsbg(dst, src, lBitPos, rBitPos, nRotate, test_only); // Rotate, then xor selected.
575 }
576
577 void MacroAssembler::add64(Register r1, RegisterOrConstant inc) {
578 if (inc.is_register()) {
579 z_agr(r1, inc.as_register());
580 } else { // constant
581 intptr_t imm = inc.as_constant();
582 add2reg(r1, imm);
583 }
584 }
585 // Helper function to multiply the 64bit contents of a register by a 16bit constant.
586 // The optimization tries to avoid the mghi instruction, since it uses the FPU for
587 // calculation and is thus rather slow.
588 //
589 // There is no handling for special cases, e.g. cval==0 or cval==1.
590 //
591 // Returns len of generated code block.
592 unsigned int MacroAssembler::mul_reg64_const16(Register rval, Register work, int cval) {
593 int block_start = offset();
594
595 bool sign_flip = cval < 0;
596 cval = sign_flip ? -cval : cval;
597
598 BLOCK_COMMENT("Reg64*Con16 {");
599
600 int bit1 = cval & -cval;
601 if (bit1 == cval) {
602 z_sllg(rval, rval, exact_log2(bit1));
603 if (sign_flip) { z_lcgr(rval, rval); }
604 } else {
605 int bit2 = (cval-bit1) & -(cval-bit1);
606 if ((bit1+bit2) == cval) {
607 z_sllg(work, rval, exact_log2(bit1));
608 z_sllg(rval, rval, exact_log2(bit2));
609 z_agr(rval, work);
610 if (sign_flip) { z_lcgr(rval, rval); }
611 } else {
612 if (sign_flip) { z_mghi(rval, -cval); }
613 else { z_mghi(rval, cval); }
614 }
615 }
616 BLOCK_COMMENT("} Reg64*Con16");
617
618 int block_end = offset();
619 return block_end - block_start;
620 }
621
622 // Generic operation r1 := r2 + imm.
623 //
624 // Should produce the best code for each supported CPU version.
625 // r2 == noreg yields r1 := r1 + imm
626 // imm == 0 emits either no instruction or r1 := r2 !
627 // NOTES: 1) Don't use this function where fixed sized
628 // instruction sequences are required!!!
629 // 2) Don't use this function if condition code
630 // setting is required!
631 // 3) Despite being declared as int64_t, the parameter imm
632 // must be a simm_32 value (= signed 32-bit integer).
633 void MacroAssembler::add2reg(Register r1, int64_t imm, Register r2) {
634 assert(Immediate::is_simm32(imm), "probably an implicit conversion went wrong");
635
636 if (r2 == noreg) { r2 = r1; }
637
638 // Handle special case imm == 0.
639 if (imm == 0) {
640 lgr_if_needed(r1, r2);
641 // Nothing else to do.
642 return;
643 }
644
645 if (!PreferLAoverADD || (r2 == Z_R0)) {
646 bool distinctOpnds = VM_Version::has_DistinctOpnds();
647
648 // Can we encode imm in 16 bits signed?
649 if (Immediate::is_simm16(imm)) {
650 if (r1 == r2) {
651 z_aghi(r1, imm);
652 return;
653 }
654 if (distinctOpnds) {
655 z_aghik(r1, r2, imm);
656 return;
657 }
658 z_lgr(r1, r2);
659 z_aghi(r1, imm);
660 return;
661 }
662 } else {
663 // Can we encode imm in 12 bits unsigned?
664 if (Displacement::is_shortDisp(imm)) {
665 z_la(r1, imm, r2);
666 return;
667 }
668 // Can we encode imm in 20 bits signed?
669 if (Displacement::is_validDisp(imm)) {
670 // Always use LAY instruction, so we don't need the tmp register.
671 z_lay(r1, imm, r2);
672 return;
673 }
674
675 }
676
677 // Can handle it (all possible values) with long immediates.
678 lgr_if_needed(r1, r2);
679 z_agfi(r1, imm);
680 }
681
682 // Generic operation r := b + x + d
683 //
684 // Addition of several operands with address generation semantics - sort of:
685 // - no restriction on the registers. Any register will do for any operand.
686 // - x == noreg: operand will be disregarded.
687 // - b == noreg: will use (contents of) result reg as operand (r := r + d).
688 // - x == Z_R0: just disregard
689 // - b == Z_R0: use as operand. This is not address generation semantics!!!
690 //
691 // The same restrictions as on add2reg() are valid!!!
692 void MacroAssembler::add2reg_with_index(Register r, int64_t d, Register x, Register b) {
693 assert(Immediate::is_simm32(d), "probably an implicit conversion went wrong");
694
695 if (x == noreg) { x = Z_R0; }
696 if (b == noreg) { b = r; }
697
698 // Handle special case x == R0.
699 if (x == Z_R0) {
700 // Can simply add the immediate value to the base register.
701 add2reg(r, d, b);
702 return;
703 }
704
705 if (!PreferLAoverADD || (b == Z_R0)) {
706 bool distinctOpnds = VM_Version::has_DistinctOpnds();
707 // Handle special case d == 0.
708 if (d == 0) {
709 if (b == x) { z_sllg(r, b, 1); return; }
710 if (r == x) { z_agr(r, b); return; }
711 if (r == b) { z_agr(r, x); return; }
712 if (distinctOpnds) { z_agrk(r, x, b); return; }
713 z_lgr(r, b);
714 z_agr(r, x);
715 } else {
716 if (x == b) { z_sllg(r, x, 1); }
717 else if (r == x) { z_agr(r, b); }
718 else if (r == b) { z_agr(r, x); }
719 else if (distinctOpnds) { z_agrk(r, x, b); }
720 else {
721 z_lgr(r, b);
722 z_agr(r, x);
723 }
724 add2reg(r, d);
725 }
726 } else {
727 // Can we encode imm in 12 bits unsigned?
728 if (Displacement::is_shortDisp(d)) {
729 z_la(r, d, x, b);
730 return;
731 }
732 // Can we encode imm in 20 bits signed?
733 if (Displacement::is_validDisp(d)) {
734 z_lay(r, d, x, b);
735 return;
736 }
737 z_la(r, 0, x, b);
738 add2reg(r, d);
739 }
740 }
741
742 // Generic emitter (32bit) for direct memory increment.
743 // For optimal code, do not specify Z_R0 as temp register.
744 void MacroAssembler::add2mem_32(const Address &a, int64_t imm, Register tmp) {
745 if (VM_Version::has_MemWithImmALUOps() && Immediate::is_simm8(imm)) {
746 z_asi(a, imm);
747 } else {
748 z_lgf(tmp, a);
749 add2reg(tmp, imm);
750 z_st(tmp, a);
751 }
752 }
753
754 void MacroAssembler::add2mem_64(const Address &a, int64_t imm, Register tmp) {
755 if (VM_Version::has_MemWithImmALUOps() && Immediate::is_simm8(imm)) {
756 z_agsi(a, imm);
757 } else {
758 z_lg(tmp, a);
759 add2reg(tmp, imm);
760 z_stg(tmp, a);
761 }
762 }
763
764 void MacroAssembler::load_sized_value(Register dst, Address src, size_t size_in_bytes, bool is_signed) {
765 switch (size_in_bytes) {
766 case 8: z_lg(dst, src); break;
767 case 4: is_signed ? z_lgf(dst, src) : z_llgf(dst, src); break;
768 case 2: is_signed ? z_lgh(dst, src) : z_llgh(dst, src); break;
769 case 1: is_signed ? z_lgb(dst, src) : z_llgc(dst, src); break;
770 default: ShouldNotReachHere();
771 }
772 }
773
774 void MacroAssembler::store_sized_value(Register src, Address dst, size_t size_in_bytes) {
775 switch (size_in_bytes) {
776 case 8: z_stg(src, dst); break;
777 case 4: z_st(src, dst); break;
778 case 2: z_sth(src, dst); break;
779 case 1: z_stc(src, dst); break;
780 default: ShouldNotReachHere();
781 }
782 }
783
784 // Split a si20 offset (20bit, signed) into an ui12 offset (12bit, unsigned) and
785 // a high-order summand in register tmp.
786 //
787 // return value: < 0: No split required, si20 actually has property uimm12.
788 // >= 0: Split performed. Use return value as uimm12 displacement and
789 // tmp as index register.
790 int MacroAssembler::split_largeoffset(int64_t si20_offset, Register tmp, bool fixed_codelen, bool accumulate) {
791 assert(Immediate::is_simm20(si20_offset), "sanity");
792 int lg_off = (int)si20_offset & 0x0fff; // Punch out low-order 12 bits, always positive.
793 int ll_off = (int)si20_offset & ~0x0fff; // Force low-order 12 bits to zero.
794 assert((Displacement::is_shortDisp(si20_offset) && (ll_off == 0)) ||
795 !Displacement::is_shortDisp(si20_offset), "unexpected offset values");
796 assert((lg_off+ll_off) == si20_offset, "offset splitup error");
797
798 Register work = accumulate? Z_R0 : tmp;
799
800 if (fixed_codelen) { // Len of code = 10 = 4 + 6.
801 z_lghi(work, ll_off>>12); // Implicit sign extension.
802 z_slag(work, work, 12);
803 } else { // Len of code = 0..10.
804 if (ll_off == 0) { return -1; }
805 // ll_off has 8 significant bits (at most) plus sign.
806 if ((ll_off & 0x0000f000) == 0) { // Non-zero bits only in upper halfbyte.
807 z_llilh(work, ll_off >> 16);
808 if (ll_off < 0) { // Sign-extension required.
809 z_lgfr(work, work);
810 }
811 } else {
812 if ((ll_off & 0x000f0000) == 0) { // Non-zero bits only in lower halfbyte.
813 z_llill(work, ll_off);
814 } else { // Non-zero bits in both halfbytes.
815 z_lghi(work, ll_off>>12); // Implicit sign extension.
816 z_slag(work, work, 12);
817 }
818 }
819 }
820 if (accumulate) { z_algr(tmp, work); } // len of code += 4
821 return lg_off;
822 }
823
824 void MacroAssembler::load_float_largeoffset(FloatRegister t, int64_t si20, Register a, Register tmp) {
825 if (Displacement::is_validDisp(si20)) {
826 z_ley(t, si20, a);
827 } else {
828 // Fixed_codelen = true is a simple way to ensure that the size of load_float_largeoffset
829 // does not depend on si20 (scratch buffer emit size == code buffer emit size for constant
830 // pool loads).
831 bool accumulate = true;
832 bool fixed_codelen = true;
833 Register work;
834
835 if (fixed_codelen) {
836 z_lgr(tmp, a); // Lgr_if_needed not applicable due to fixed_codelen.
837 } else {
838 accumulate = (a == tmp);
839 }
840 work = tmp;
841
842 int disp12 = split_largeoffset(si20, work, fixed_codelen, accumulate);
843 if (disp12 < 0) {
844 z_le(t, si20, work);
845 } else {
846 if (accumulate) {
847 z_le(t, disp12, work);
848 } else {
849 z_le(t, disp12, work, a);
850 }
851 }
852 }
853 }
854
855 void MacroAssembler::load_double_largeoffset(FloatRegister t, int64_t si20, Register a, Register tmp) {
856 if (Displacement::is_validDisp(si20)) {
857 z_ldy(t, si20, a);
858 } else {
859 // Fixed_codelen = true is a simple way to ensure that the size of load_double_largeoffset
860 // does not depend on si20 (scratch buffer emit size == code buffer emit size for constant
861 // pool loads).
862 bool accumulate = true;
863 bool fixed_codelen = true;
864 Register work;
865
866 if (fixed_codelen) {
867 z_lgr(tmp, a); // Lgr_if_needed not applicable due to fixed_codelen.
868 } else {
869 accumulate = (a == tmp);
870 }
871 work = tmp;
872
873 int disp12 = split_largeoffset(si20, work, fixed_codelen, accumulate);
874 if (disp12 < 0) {
875 z_ld(t, si20, work);
876 } else {
877 if (accumulate) {
878 z_ld(t, disp12, work);
879 } else {
880 z_ld(t, disp12, work, a);
881 }
882 }
883 }
884 }
885
886 // PCrelative TOC access.
887 // Returns distance (in bytes) from current position to start of consts section.
888 // Returns 0 (zero) if no consts section exists or if it has size zero.
889 long MacroAssembler::toc_distance() {
890 CodeSection* cs = code()->consts();
891 return (long)((cs != NULL) ? cs->start()-pc() : 0);
892 }
893
894 // Implementation on x86/sparc assumes that constant and instruction section are
895 // adjacent, but this doesn't hold. Two special situations may occur, that we must
896 // be able to handle:
897 // 1. const section may be located apart from the inst section.
898 // 2. const section may be empty
899 // In both cases, we use the const section's start address to compute the "TOC",
900 // this seems to occur only temporarily; in the final step we always seem to end up
901 // with the pc-relatice variant.
902 //
903 // PC-relative offset could be +/-2**32 -> use long for disp
904 // Furthermore: makes no sense to have special code for
905 // adjacent const and inst sections.
906 void MacroAssembler::load_toc(Register Rtoc) {
907 // Simply use distance from start of const section (should be patched in the end).
908 long disp = toc_distance();
909
910 RelocationHolder rspec = internal_word_Relocation::spec(pc() + disp);
911 relocate(rspec);
912 z_larl(Rtoc, RelAddr::pcrel_off32(disp)); // Offset is in halfwords.
913 }
914
915 // PCrelative TOC access.
916 // Load from anywhere pcrelative (with relocation of load instr)
917 void MacroAssembler::load_long_pcrelative(Register Rdst, address dataLocation) {
918 address pc = this->pc();
919 ptrdiff_t total_distance = dataLocation - pc;
920 RelocationHolder rspec = internal_word_Relocation::spec(dataLocation);
921
922 assert((total_distance & 0x01L) == 0, "halfword alignment is mandatory");
923 assert(total_distance != 0, "sanity");
924
925 // Some extra safety net.
926 if (!RelAddr::is_in_range_of_RelAddr32(total_distance)) {
927 guarantee(RelAddr::is_in_range_of_RelAddr32(total_distance), "load_long_pcrelative can't handle distance " INTPTR_FORMAT, total_distance);
928 }
929
930 (this)->relocate(rspec, relocInfo::pcrel_addr_format);
931 z_lgrl(Rdst, RelAddr::pcrel_off32(total_distance));
932 }
933
934
935 // PCrelative TOC access.
936 // Load from anywhere pcrelative (with relocation of load instr)
937 // loaded addr has to be relocated when added to constant pool.
938 void MacroAssembler::load_addr_pcrelative(Register Rdst, address addrLocation) {
939 address pc = this->pc();
940 ptrdiff_t total_distance = addrLocation - pc;
941 RelocationHolder rspec = internal_word_Relocation::spec(addrLocation);
942
943 assert((total_distance & 0x01L) == 0, "halfword alignment is mandatory");
944
945 // Some extra safety net.
946 if (!RelAddr::is_in_range_of_RelAddr32(total_distance)) {
947 guarantee(RelAddr::is_in_range_of_RelAddr32(total_distance), "load_long_pcrelative can't handle distance " INTPTR_FORMAT, total_distance);
948 }
949
950 (this)->relocate(rspec, relocInfo::pcrel_addr_format);
951 z_lgrl(Rdst, RelAddr::pcrel_off32(total_distance));
952 }
953
954 // Generic operation: load a value from memory and test.
955 // CondCode indicates the sign (<0, ==0, >0) of the loaded value.
956 void MacroAssembler::load_and_test_byte(Register dst, const Address &a) {
957 z_lb(dst, a);
958 z_ltr(dst, dst);
959 }
960
961 void MacroAssembler::load_and_test_short(Register dst, const Address &a) {
962 int64_t disp = a.disp20();
963 if (Displacement::is_shortDisp(disp)) {
964 z_lh(dst, a);
965 } else if (Displacement::is_longDisp(disp)) {
966 z_lhy(dst, a);
967 } else {
968 guarantee(false, "displacement out of range");
969 }
970 z_ltr(dst, dst);
971 }
972
973 void MacroAssembler::load_and_test_int(Register dst, const Address &a) {
974 z_lt(dst, a);
975 }
976
977 void MacroAssembler::load_and_test_int2long(Register dst, const Address &a) {
978 z_ltgf(dst, a);
979 }
980
981 void MacroAssembler::load_and_test_long(Register dst, const Address &a) {
982 z_ltg(dst, a);
983 }
984
985 // Test a bit in memory.
986 void MacroAssembler::testbit(const Address &a, unsigned int bit) {
987 assert(a.index() == noreg, "no index reg allowed in testbit");
988 if (bit <= 7) {
989 z_tm(a.disp() + 3, a.base(), 1 << bit);
990 } else if (bit <= 15) {
991 z_tm(a.disp() + 2, a.base(), 1 << (bit - 8));
992 } else if (bit <= 23) {
993 z_tm(a.disp() + 1, a.base(), 1 << (bit - 16));
994 } else if (bit <= 31) {
995 z_tm(a.disp() + 0, a.base(), 1 << (bit - 24));
996 } else {
997 ShouldNotReachHere();
998 }
999 }
1000
1001 // Test a bit in a register. Result is reflected in CC.
1002 void MacroAssembler::testbit(Register r, unsigned int bitPos) {
1003 if (bitPos < 16) {
1004 z_tmll(r, 1U<<bitPos);
1005 } else if (bitPos < 32) {
1006 z_tmlh(r, 1U<<(bitPos-16));
1007 } else if (bitPos < 48) {
1008 z_tmhl(r, 1U<<(bitPos-32));
1009 } else if (bitPos < 64) {
1010 z_tmhh(r, 1U<<(bitPos-48));
1011 } else {
1012 ShouldNotReachHere();
1013 }
1014 }
1015
1016 void MacroAssembler::prefetch_read(Address a) {
1017 z_pfd(1, a.disp20(), a.indexOrR0(), a.base());
1018 }
1019 void MacroAssembler::prefetch_update(Address a) {
1020 z_pfd(2, a.disp20(), a.indexOrR0(), a.base());
1021 }
1022
1023 // Clear a register, i.e. load const zero into reg.
1024 // Return len (in bytes) of generated instruction(s).
1025 // whole_reg: Clear 64 bits if true, 32 bits otherwise.
1026 // set_cc: Use instruction that sets the condition code, if true.
1027 int MacroAssembler::clear_reg(Register r, bool whole_reg, bool set_cc) {
1028 unsigned int start_off = offset();
1029 if (whole_reg) {
1030 set_cc ? z_xgr(r, r) : z_laz(r, 0, Z_R0);
1031 } else { // Only 32bit register.
1032 set_cc ? z_xr(r, r) : z_lhi(r, 0);
1033 }
1034 return offset() - start_off;
1035 }
1036
1037 #ifdef ASSERT
1038 int MacroAssembler::preset_reg(Register r, unsigned long pattern, int pattern_len) {
1039 switch (pattern_len) {
1040 case 1:
1041 pattern = (pattern & 0x000000ff) | ((pattern & 0x000000ff)<<8);
1042 case 2:
1043 pattern = (pattern & 0x0000ffff) | ((pattern & 0x0000ffff)<<16);
1044 case 4:
1045 pattern = (pattern & 0xffffffffL) | ((pattern & 0xffffffffL)<<32);
1046 case 8:
1047 return load_const_optimized_rtn_len(r, pattern, true);
1048 break;
1049 default:
1050 guarantee(false, "preset_reg: bad len");
1051 }
1052 return 0;
1053 }
1054 #endif
1055
1056 // addr: Address descriptor of memory to clear index register will not be used !
1057 // size: Number of bytes to clear.
1058 // !!! DO NOT USE THEM FOR ATOMIC MEMORY CLEARING !!!
1059 // !!! Use store_const() instead !!!
1060 void MacroAssembler::clear_mem(const Address& addr, unsigned size) {
1061 guarantee(size <= 256, "MacroAssembler::clear_mem: size too large");
1062
1063 if (size == 1) {
1064 z_mvi(addr, 0);
1065 return;
1066 }
1067
1068 switch (size) {
1069 case 2: z_mvhhi(addr, 0);
1070 return;
1071 case 4: z_mvhi(addr, 0);
1072 return;
1073 case 8: z_mvghi(addr, 0);
1074 return;
1075 default: ; // Fallthru to xc.
1076 }
1077
1078 z_xc(addr, size, addr);
1079 }
1080
1081 void MacroAssembler::align(int modulus) {
1082 while (offset() % modulus != 0) z_nop();
1083 }
1084
1085 // Special version for non-relocateable code if required alignment
1086 // is larger than CodeEntryAlignment.
1087 void MacroAssembler::align_address(int modulus) {
1088 while ((uintptr_t)pc() % modulus != 0) z_nop();
1089 }
1090
1091 Address MacroAssembler::argument_address(RegisterOrConstant arg_slot,
1092 Register temp_reg,
1093 int64_t extra_slot_offset) {
1094 // On Z, we can have index and disp in an Address. So don't call argument_offset,
1095 // which issues an unnecessary add instruction.
1096 int stackElementSize = Interpreter::stackElementSize;
1097 int64_t offset = extra_slot_offset * stackElementSize;
1098 const Register argbase = Z_esp;
1099 if (arg_slot.is_constant()) {
1100 offset += arg_slot.as_constant() * stackElementSize;
1101 return Address(argbase, offset);
1102 }
1103 // else
1104 assert(temp_reg != noreg, "must specify");
1105 assert(temp_reg != Z_ARG1, "base and index are conflicting");
1106 z_sllg(temp_reg, arg_slot.as_register(), exact_log2(stackElementSize)); // tempreg = arg_slot << 3
1107 return Address(argbase, temp_reg, offset);
1108 }
1109
1110
1111 //===================================================================
1112 //=== START C O N S T A N T S I N C O D E S T R E A M ===
1113 //===================================================================
1114 //=== P A T CH A B L E C O N S T A N T S ===
1115 //===================================================================
1116
1117
1118 //---------------------------------------------------
1119 // Load (patchable) constant into register
1120 //---------------------------------------------------
1121
1122
1123 // Load absolute address (and try to optimize).
1124 // Note: This method is usable only for position-fixed code,
1125 // referring to a position-fixed target location.
1126 // If not so, relocations and patching must be used.
1127 void MacroAssembler::load_absolute_address(Register d, address addr) {
1128 assert(addr != NULL, "should not happen");
1129 BLOCK_COMMENT("load_absolute_address:");
1130 if (addr == NULL) {
1131 z_larl(d, pc()); // Dummy emit for size calc.
1132 return;
1133 }
1134
1135 if (RelAddr::is_in_range_of_RelAddr32(addr, pc())) {
1136 z_larl(d, addr);
1137 return;
1138 }
1139
1140 load_const_optimized(d, (long)addr);
1141 }
1142
1143 // Load a 64bit constant.
1144 // Patchable code sequence, but not atomically patchable.
1145 // Make sure to keep code size constant -> no value-dependent optimizations.
1146 // Do not kill condition code.
1147 void MacroAssembler::load_const(Register t, long x) {
1148 // Note: Right shift is only cleanly defined for unsigned types
1149 // or for signed types with nonnegative values.
1150 Assembler::z_iihf(t, (long)((unsigned long)x >> 32));
1151 Assembler::z_iilf(t, (long)((unsigned long)x & 0xffffffffUL));
1152 }
1153
1154 // Load a 32bit constant into a 64bit register, sign-extend or zero-extend.
1155 // Patchable code sequence, but not atomically patchable.
1156 // Make sure to keep code size constant -> no value-dependent optimizations.
1157 // Do not kill condition code.
1158 void MacroAssembler::load_const_32to64(Register t, int64_t x, bool sign_extend) {
1159 if (sign_extend) { Assembler::z_lgfi(t, x); }
1160 else { Assembler::z_llilf(t, x); }
1161 }
1162
1163 // Load narrow oop constant, no decompression.
1164 void MacroAssembler::load_narrow_oop(Register t, narrowOop a) {
1165 assert(UseCompressedOops, "must be on to call this method");
1166 load_const_32to64(t, CompressedOops::narrow_oop_value(a), false /*sign_extend*/);
1167 }
1168
1169 // Load narrow klass constant, compression required.
1170 void MacroAssembler::load_narrow_klass(Register t, Klass* k) {
1171 assert(UseCompressedClassPointers, "must be on to call this method");
1172 narrowKlass encoded_k = CompressedKlassPointers::encode(k);
1173 load_const_32to64(t, encoded_k, false /*sign_extend*/);
1174 }
1175
1176 //------------------------------------------------------
1177 // Compare (patchable) constant with register.
1178 //------------------------------------------------------
1179
1180 // Compare narrow oop in reg with narrow oop constant, no decompression.
1181 void MacroAssembler::compare_immediate_narrow_oop(Register oop1, narrowOop oop2) {
1182 assert(UseCompressedOops, "must be on to call this method");
1183
1184 Assembler::z_clfi(oop1, CompressedOops::narrow_oop_value(oop2));
1185 }
1186
1187 // Compare narrow oop in reg with narrow oop constant, no decompression.
1188 void MacroAssembler::compare_immediate_narrow_klass(Register klass1, Klass* klass2) {
1189 assert(UseCompressedClassPointers, "must be on to call this method");
1190 narrowKlass encoded_k = CompressedKlassPointers::encode(klass2);
1191
1192 Assembler::z_clfi(klass1, encoded_k);
1193 }
1194
1195 //----------------------------------------------------------
1196 // Check which kind of load_constant we have here.
1197 //----------------------------------------------------------
1198
1199 // Detection of CPU version dependent load_const sequence.
1200 // The detection is valid only for code sequences generated by load_const,
1201 // not load_const_optimized.
1202 bool MacroAssembler::is_load_const(address a) {
1203 unsigned long inst1, inst2;
1204 unsigned int len1, len2;
1205
1206 len1 = get_instruction(a, &inst1);
1207 len2 = get_instruction(a + len1, &inst2);
1208
1209 return is_z_iihf(inst1) && is_z_iilf(inst2);
1210 }
1211
1212 // Detection of CPU version dependent load_const_32to64 sequence.
1213 // Mostly used for narrow oops and narrow Klass pointers.
1214 // The detection is valid only for code sequences generated by load_const_32to64.
1215 bool MacroAssembler::is_load_const_32to64(address pos) {
1216 unsigned long inst1, inst2;
1217 unsigned int len1;
1218
1219 len1 = get_instruction(pos, &inst1);
1220 return is_z_llilf(inst1);
1221 }
1222
1223 // Detection of compare_immediate_narrow sequence.
1224 // The detection is valid only for code sequences generated by compare_immediate_narrow_oop.
1225 bool MacroAssembler::is_compare_immediate32(address pos) {
1226 return is_equal(pos, CLFI_ZOPC, RIL_MASK);
1227 }
1228
1229 // Detection of compare_immediate_narrow sequence.
1230 // The detection is valid only for code sequences generated by compare_immediate_narrow_oop.
1231 bool MacroAssembler::is_compare_immediate_narrow_oop(address pos) {
1232 return is_compare_immediate32(pos);
1233 }
1234
1235 // Detection of compare_immediate_narrow sequence.
1236 // The detection is valid only for code sequences generated by compare_immediate_narrow_klass.
1237 bool MacroAssembler::is_compare_immediate_narrow_klass(address pos) {
1238 return is_compare_immediate32(pos);
1239 }
1240
1241 //-----------------------------------
1242 // patch the load_constant
1243 //-----------------------------------
1244
1245 // CPU-version dependent patching of load_const.
1246 void MacroAssembler::patch_const(address a, long x) {
1247 assert(is_load_const(a), "not a load of a constant");
1248 // Note: Right shift is only cleanly defined for unsigned types
1249 // or for signed types with nonnegative values.
1250 set_imm32((address)a, (long)((unsigned long)x >> 32));
1251 set_imm32((address)(a + 6), (long)((unsigned long)x & 0xffffffffUL));
1252 }
1253
1254 // Patching the value of CPU version dependent load_const_32to64 sequence.
1255 // The passed ptr MUST be in compressed format!
1256 int MacroAssembler::patch_load_const_32to64(address pos, int64_t np) {
1257 assert(is_load_const_32to64(pos), "not a load of a narrow ptr (oop or klass)");
1258
1259 set_imm32(pos, np);
1260 return 6;
1261 }
1262
1263 // Patching the value of CPU version dependent compare_immediate_narrow sequence.
1264 // The passed ptr MUST be in compressed format!
1265 int MacroAssembler::patch_compare_immediate_32(address pos, int64_t np) {
1266 assert(is_compare_immediate32(pos), "not a compressed ptr compare");
1267
1268 set_imm32(pos, np);
1269 return 6;
1270 }
1271
1272 // Patching the immediate value of CPU version dependent load_narrow_oop sequence.
1273 // The passed ptr must NOT be in compressed format!
1274 int MacroAssembler::patch_load_narrow_oop(address pos, oop o) {
1275 assert(UseCompressedOops, "Can only patch compressed oops");
1276 return patch_load_const_32to64(pos, CompressedOops::narrow_oop_value(o));
1277 }
1278
1279 // Patching the immediate value of CPU version dependent load_narrow_klass sequence.
1280 // The passed ptr must NOT be in compressed format!
1281 int MacroAssembler::patch_load_narrow_klass(address pos, Klass* k) {
1282 assert(UseCompressedClassPointers, "Can only patch compressed klass pointers");
1283
1284 narrowKlass nk = CompressedKlassPointers::encode(k);
1285 return patch_load_const_32to64(pos, nk);
1286 }
1287
1288 // Patching the immediate value of CPU version dependent compare_immediate_narrow_oop sequence.
1289 // The passed ptr must NOT be in compressed format!
1290 int MacroAssembler::patch_compare_immediate_narrow_oop(address pos, oop o) {
1291 assert(UseCompressedOops, "Can only patch compressed oops");
1292 return patch_compare_immediate_32(pos, CompressedOops::narrow_oop_value(o));
1293 }
1294
1295 // Patching the immediate value of CPU version dependent compare_immediate_narrow_klass sequence.
1296 // The passed ptr must NOT be in compressed format!
1297 int MacroAssembler::patch_compare_immediate_narrow_klass(address pos, Klass* k) {
1298 assert(UseCompressedClassPointers, "Can only patch compressed klass pointers");
1299
1300 narrowKlass nk = CompressedKlassPointers::encode(k);
1301 return patch_compare_immediate_32(pos, nk);
1302 }
1303
1304 //------------------------------------------------------------------------
1305 // Extract the constant from a load_constant instruction stream.
1306 //------------------------------------------------------------------------
1307
1308 // Get constant from a load_const sequence.
1309 long MacroAssembler::get_const(address a) {
1310 assert(is_load_const(a), "not a load of a constant");
1311 unsigned long x;
1312 x = (((unsigned long) (get_imm32(a,0) & 0xffffffff)) << 32);
1313 x |= (((unsigned long) (get_imm32(a,1) & 0xffffffff)));
1314 return (long) x;
1315 }
1316
1317 //--------------------------------------
1318 // Store a constant in memory.
1319 //--------------------------------------
1320
1321 // General emitter to move a constant to memory.
1322 // The store is atomic.
1323 // o Address must be given in RS format (no index register)
1324 // o Displacement should be 12bit unsigned for efficiency. 20bit signed also supported.
1325 // o Constant can be 1, 2, 4, or 8 bytes, signed or unsigned.
1326 // o Memory slot can be 1, 2, 4, or 8 bytes, signed or unsigned.
1327 // o Memory slot must be at least as wide as constant, will assert otherwise.
1328 // o Signed constants will sign-extend, unsigned constants will zero-extend to slot width.
1329 int MacroAssembler::store_const(const Address &dest, long imm,
1330 unsigned int lm, unsigned int lc,
1331 Register scratch) {
1332 int64_t disp = dest.disp();
1333 Register base = dest.base();
1334 assert(!dest.has_index(), "not supported");
1335 assert((lm==1)||(lm==2)||(lm==4)||(lm==8), "memory length not supported");
1336 assert((lc==1)||(lc==2)||(lc==4)||(lc==8), "constant length not supported");
1337 assert(lm>=lc, "memory slot too small");
1338 assert(lc==8 || Immediate::is_simm(imm, lc*8), "const out of range");
1339 assert(Displacement::is_validDisp(disp), "displacement out of range");
1340
1341 bool is_shortDisp = Displacement::is_shortDisp(disp);
1342 int store_offset = -1;
1343
1344 // For target len == 1 it's easy.
1345 if (lm == 1) {
1346 store_offset = offset();
1347 if (is_shortDisp) {
1348 z_mvi(disp, base, imm);
1349 return store_offset;
1350 } else {
1351 z_mviy(disp, base, imm);
1352 return store_offset;
1353 }
1354 }
1355
1356 // All the "good stuff" takes an unsigned displacement.
1357 if (is_shortDisp) {
1358 // NOTE: Cannot use clear_mem for imm==0, because it is not atomic.
1359
1360 store_offset = offset();
1361 switch (lm) {
1362 case 2: // Lc == 1 handled correctly here, even for unsigned. Instruction does no widening.
1363 z_mvhhi(disp, base, imm);
1364 return store_offset;
1365 case 4:
1366 if (Immediate::is_simm16(imm)) {
1367 z_mvhi(disp, base, imm);
1368 return store_offset;
1369 }
1370 break;
1371 case 8:
1372 if (Immediate::is_simm16(imm)) {
1373 z_mvghi(disp, base, imm);
1374 return store_offset;
1375 }
1376 break;
1377 default:
1378 ShouldNotReachHere();
1379 break;
1380 }
1381 }
1382
1383 // Can't optimize, so load value and store it.
1384 guarantee(scratch != noreg, " need a scratch register here !");
1385 if (imm != 0) {
1386 load_const_optimized(scratch, imm); // Preserves CC anyway.
1387 } else {
1388 // Leave CC alone!!
1389 (void) clear_reg(scratch, true, false); // Indicate unused result.
1390 }
1391
1392 store_offset = offset();
1393 if (is_shortDisp) {
1394 switch (lm) {
1395 case 2:
1396 z_sth(scratch, disp, Z_R0, base);
1397 return store_offset;
1398 case 4:
1399 z_st(scratch, disp, Z_R0, base);
1400 return store_offset;
1401 case 8:
1402 z_stg(scratch, disp, Z_R0, base);
1403 return store_offset;
1404 default:
1405 ShouldNotReachHere();
1406 break;
1407 }
1408 } else {
1409 switch (lm) {
1410 case 2:
1411 z_sthy(scratch, disp, Z_R0, base);
1412 return store_offset;
1413 case 4:
1414 z_sty(scratch, disp, Z_R0, base);
1415 return store_offset;
1416 case 8:
1417 z_stg(scratch, disp, Z_R0, base);
1418 return store_offset;
1419 default:
1420 ShouldNotReachHere();
1421 break;
1422 }
1423 }
1424 return -1; // should not reach here
1425 }
1426
1427 //===================================================================
1428 //=== N O T P A T CH A B L E C O N S T A N T S ===
1429 //===================================================================
1430
1431 // Load constant x into register t with a fast instruction sequence
1432 // depending on the bits in x. Preserves CC under all circumstances.
1433 int MacroAssembler::load_const_optimized_rtn_len(Register t, long x, bool emit) {
1434 if (x == 0) {
1435 int len;
1436 if (emit) {
1437 len = clear_reg(t, true, false);
1438 } else {
1439 len = 4;
1440 }
1441 return len;
1442 }
1443
1444 if (Immediate::is_simm16(x)) {
1445 if (emit) { z_lghi(t, x); }
1446 return 4;
1447 }
1448
1449 // 64 bit value: | part1 | part2 | part3 | part4 |
1450 // At least one part is not zero!
1451 // Note: Right shift is only cleanly defined for unsigned types
1452 // or for signed types with nonnegative values.
1453 int part1 = (int)((unsigned long)x >> 48) & 0x0000ffff;
1454 int part2 = (int)((unsigned long)x >> 32) & 0x0000ffff;
1455 int part3 = (int)((unsigned long)x >> 16) & 0x0000ffff;
1456 int part4 = (int)x & 0x0000ffff;
1457 int part12 = (int)((unsigned long)x >> 32);
1458 int part34 = (int)x;
1459
1460 // Lower word only (unsigned).
1461 if (part12 == 0) {
1462 if (part3 == 0) {
1463 if (emit) z_llill(t, part4);
1464 return 4;
1465 }
1466 if (part4 == 0) {
1467 if (emit) z_llilh(t, part3);
1468 return 4;
1469 }
1470 if (emit) z_llilf(t, part34);
1471 return 6;
1472 }
1473
1474 // Upper word only.
1475 if (part34 == 0) {
1476 if (part1 == 0) {
1477 if (emit) z_llihl(t, part2);
1478 return 4;
1479 }
1480 if (part2 == 0) {
1481 if (emit) z_llihh(t, part1);
1482 return 4;
1483 }
1484 if (emit) z_llihf(t, part12);
1485 return 6;
1486 }
1487
1488 // Lower word only (signed).
1489 if ((part1 == 0x0000ffff) && (part2 == 0x0000ffff) && ((part3 & 0x00008000) != 0)) {
1490 if (emit) z_lgfi(t, part34);
1491 return 6;
1492 }
1493
1494 int len = 0;
1495
1496 if ((part1 == 0) || (part2 == 0)) {
1497 if (part1 == 0) {
1498 if (emit) z_llihl(t, part2);
1499 len += 4;
1500 } else {
1501 if (emit) z_llihh(t, part1);
1502 len += 4;
1503 }
1504 } else {
1505 if (emit) z_llihf(t, part12);
1506 len += 6;
1507 }
1508
1509 if ((part3 == 0) || (part4 == 0)) {
1510 if (part3 == 0) {
1511 if (emit) z_iill(t, part4);
1512 len += 4;
1513 } else {
1514 if (emit) z_iilh(t, part3);
1515 len += 4;
1516 }
1517 } else {
1518 if (emit) z_iilf(t, part34);
1519 len += 6;
1520 }
1521 return len;
1522 }
1523
1524 //=====================================================================
1525 //=== H I G H E R L E V E L B R A N C H E M I T T E R S ===
1526 //=====================================================================
1527
1528 // Note: In the worst case, one of the scratch registers is destroyed!!!
1529 void MacroAssembler::compare32_and_branch(Register r1, RegisterOrConstant x2, branch_condition cond, Label& lbl) {
1530 // Right operand is constant.
1531 if (x2.is_constant()) {
1532 jlong value = x2.as_constant();
1533 compare_and_branch_optimized(r1, value, cond, lbl, /*len64=*/false, /*has_sign=*/true);
1534 return;
1535 }
1536
1537 // Right operand is in register.
1538 compare_and_branch_optimized(r1, x2.as_register(), cond, lbl, /*len64=*/false, /*has_sign=*/true);
1539 }
1540
1541 // Note: In the worst case, one of the scratch registers is destroyed!!!
1542 void MacroAssembler::compareU32_and_branch(Register r1, RegisterOrConstant x2, branch_condition cond, Label& lbl) {
1543 // Right operand is constant.
1544 if (x2.is_constant()) {
1545 jlong value = x2.as_constant();
1546 compare_and_branch_optimized(r1, value, cond, lbl, /*len64=*/false, /*has_sign=*/false);
1547 return;
1548 }
1549
1550 // Right operand is in register.
1551 compare_and_branch_optimized(r1, x2.as_register(), cond, lbl, /*len64=*/false, /*has_sign=*/false);
1552 }
1553
1554 // Note: In the worst case, one of the scratch registers is destroyed!!!
1555 void MacroAssembler::compare64_and_branch(Register r1, RegisterOrConstant x2, branch_condition cond, Label& lbl) {
1556 // Right operand is constant.
1557 if (x2.is_constant()) {
1558 jlong value = x2.as_constant();
1559 compare_and_branch_optimized(r1, value, cond, lbl, /*len64=*/true, /*has_sign=*/true);
1560 return;
1561 }
1562
1563 // Right operand is in register.
1564 compare_and_branch_optimized(r1, x2.as_register(), cond, lbl, /*len64=*/true, /*has_sign=*/true);
1565 }
1566
1567 void MacroAssembler::compareU64_and_branch(Register r1, RegisterOrConstant x2, branch_condition cond, Label& lbl) {
1568 // Right operand is constant.
1569 if (x2.is_constant()) {
1570 jlong value = x2.as_constant();
1571 compare_and_branch_optimized(r1, value, cond, lbl, /*len64=*/true, /*has_sign=*/false);
1572 return;
1573 }
1574
1575 // Right operand is in register.
1576 compare_and_branch_optimized(r1, x2.as_register(), cond, lbl, /*len64=*/true, /*has_sign=*/false);
1577 }
1578
1579 // Generate an optimal branch to the branch target.
1580 // Optimal means that a relative branch (brc or brcl) is used if the
1581 // branch distance is short enough. Loading the target address into a
1582 // register and branching via reg is used as fallback only.
1583 //
1584 // Used registers:
1585 // Z_R1 - work reg. Holds branch target address.
1586 // Used in fallback case only.
1587 //
1588 // This version of branch_optimized is good for cases where the target address is known
1589 // and constant, i.e. is never changed (no relocation, no patching).
1590 void MacroAssembler::branch_optimized(Assembler::branch_condition cond, address branch_addr) {
1591 address branch_origin = pc();
1592
1593 if (RelAddr::is_in_range_of_RelAddr16(branch_addr, branch_origin)) {
1594 z_brc(cond, branch_addr);
1595 } else if (RelAddr::is_in_range_of_RelAddr32(branch_addr, branch_origin)) {
1596 z_brcl(cond, branch_addr);
1597 } else {
1598 load_const_optimized(Z_R1, branch_addr); // CC must not get killed by load_const_optimized.
1599 z_bcr(cond, Z_R1);
1600 }
1601 }
1602
1603 // This version of branch_optimized is good for cases where the target address
1604 // is potentially not yet known at the time the code is emitted.
1605 //
1606 // One very common case is a branch to an unbound label which is handled here.
1607 // The caller might know (or hope) that the branch distance is short enough
1608 // to be encoded in a 16bit relative address. In this case he will pass a
1609 // NearLabel branch_target.
1610 // Care must be taken with unbound labels. Each call to target(label) creates
1611 // an entry in the patch queue for that label to patch all references of the label
1612 // once it gets bound. Those recorded patch locations must be patchable. Otherwise,
1613 // an assertion fires at patch time.
1614 void MacroAssembler::branch_optimized(Assembler::branch_condition cond, Label& branch_target) {
1615 if (branch_target.is_bound()) {
1616 address branch_addr = target(branch_target);
1617 branch_optimized(cond, branch_addr);
1618 } else if (branch_target.is_near()) {
1619 z_brc(cond, branch_target); // Caller assures that the target will be in range for z_brc.
1620 } else {
1621 z_brcl(cond, branch_target); // Let's hope target is in range. Otherwise, we will abort at patch time.
1622 }
1623 }
1624
1625 // Generate an optimal compare and branch to the branch target.
1626 // Optimal means that a relative branch (clgrj, brc or brcl) is used if the
1627 // branch distance is short enough. Loading the target address into a
1628 // register and branching via reg is used as fallback only.
1629 //
1630 // Input:
1631 // r1 - left compare operand
1632 // r2 - right compare operand
1633 void MacroAssembler::compare_and_branch_optimized(Register r1,
1634 Register r2,
1635 Assembler::branch_condition cond,
1636 address branch_addr,
1637 bool len64,
1638 bool has_sign) {
1639 unsigned int casenum = (len64?2:0)+(has_sign?0:1);
1640
1641 address branch_origin = pc();
1642 if (VM_Version::has_CompareBranch() && RelAddr::is_in_range_of_RelAddr16(branch_addr, branch_origin)) {
1643 switch (casenum) {
1644 case 0: z_crj( r1, r2, cond, branch_addr); break;
1645 case 1: z_clrj (r1, r2, cond, branch_addr); break;
1646 case 2: z_cgrj(r1, r2, cond, branch_addr); break;
1647 case 3: z_clgrj(r1, r2, cond, branch_addr); break;
1648 default: ShouldNotReachHere(); break;
1649 }
1650 } else {
1651 switch (casenum) {
1652 case 0: z_cr( r1, r2); break;
1653 case 1: z_clr(r1, r2); break;
1654 case 2: z_cgr(r1, r2); break;
1655 case 3: z_clgr(r1, r2); break;
1656 default: ShouldNotReachHere(); break;
1657 }
1658 branch_optimized(cond, branch_addr);
1659 }
1660 }
1661
1662 // Generate an optimal compare and branch to the branch target.
1663 // Optimal means that a relative branch (clgij, brc or brcl) is used if the
1664 // branch distance is short enough. Loading the target address into a
1665 // register and branching via reg is used as fallback only.
1666 //
1667 // Input:
1668 // r1 - left compare operand (in register)
1669 // x2 - right compare operand (immediate)
1670 void MacroAssembler::compare_and_branch_optimized(Register r1,
1671 jlong x2,
1672 Assembler::branch_condition cond,
1673 Label& branch_target,
1674 bool len64,
1675 bool has_sign) {
1676 address branch_origin = pc();
1677 bool x2_imm8 = (has_sign && Immediate::is_simm8(x2)) || (!has_sign && Immediate::is_uimm8(x2));
1678 bool is_RelAddr16 = branch_target.is_near() ||
1679 (branch_target.is_bound() &&
1680 RelAddr::is_in_range_of_RelAddr16(target(branch_target), branch_origin));
1681 unsigned int casenum = (len64?2:0)+(has_sign?0:1);
1682
1683 if (VM_Version::has_CompareBranch() && is_RelAddr16 && x2_imm8) {
1684 switch (casenum) {
1685 case 0: z_cij( r1, x2, cond, branch_target); break;
1686 case 1: z_clij(r1, x2, cond, branch_target); break;
1687 case 2: z_cgij(r1, x2, cond, branch_target); break;
1688 case 3: z_clgij(r1, x2, cond, branch_target); break;
1689 default: ShouldNotReachHere(); break;
1690 }
1691 return;
1692 }
1693
1694 if (x2 == 0) {
1695 switch (casenum) {
1696 case 0: z_ltr(r1, r1); break;
1697 case 1: z_ltr(r1, r1); break; // Caution: unsigned test only provides zero/notZero indication!
1698 case 2: z_ltgr(r1, r1); break;
1699 case 3: z_ltgr(r1, r1); break; // Caution: unsigned test only provides zero/notZero indication!
1700 default: ShouldNotReachHere(); break;
1701 }
1702 } else {
1703 if ((has_sign && Immediate::is_simm16(x2)) || (!has_sign && Immediate::is_uimm(x2, 15))) {
1704 switch (casenum) {
1705 case 0: z_chi(r1, x2); break;
1706 case 1: z_chi(r1, x2); break; // positive immediate < 2**15
1707 case 2: z_cghi(r1, x2); break;
1708 case 3: z_cghi(r1, x2); break; // positive immediate < 2**15
1709 default: break;
1710 }
1711 } else if ( (has_sign && Immediate::is_simm32(x2)) || (!has_sign && Immediate::is_uimm32(x2)) ) {
1712 switch (casenum) {
1713 case 0: z_cfi( r1, x2); break;
1714 case 1: z_clfi(r1, x2); break;
1715 case 2: z_cgfi(r1, x2); break;
1716 case 3: z_clgfi(r1, x2); break;
1717 default: ShouldNotReachHere(); break;
1718 }
1719 } else {
1720 // No instruction with immediate operand possible, so load into register.
1721 Register scratch = (r1 != Z_R0) ? Z_R0 : Z_R1;
1722 load_const_optimized(scratch, x2);
1723 switch (casenum) {
1724 case 0: z_cr( r1, scratch); break;
1725 case 1: z_clr(r1, scratch); break;
1726 case 2: z_cgr(r1, scratch); break;
1727 case 3: z_clgr(r1, scratch); break;
1728 default: ShouldNotReachHere(); break;
1729 }
1730 }
1731 }
1732 branch_optimized(cond, branch_target);
1733 }
1734
1735 // Generate an optimal compare and branch to the branch target.
1736 // Optimal means that a relative branch (clgrj, brc or brcl) is used if the
1737 // branch distance is short enough. Loading the target address into a
1738 // register and branching via reg is used as fallback only.
1739 //
1740 // Input:
1741 // r1 - left compare operand
1742 // r2 - right compare operand
1743 void MacroAssembler::compare_and_branch_optimized(Register r1,
1744 Register r2,
1745 Assembler::branch_condition cond,
1746 Label& branch_target,
1747 bool len64,
1748 bool has_sign) {
1749 unsigned int casenum = (len64 ? 2 : 0) + (has_sign ? 0 : 1);
1750
1751 if (branch_target.is_bound()) {
1752 address branch_addr = target(branch_target);
1753 compare_and_branch_optimized(r1, r2, cond, branch_addr, len64, has_sign);
1754 } else {
1755 if (VM_Version::has_CompareBranch() && branch_target.is_near()) {
1756 switch (casenum) {
1757 case 0: z_crj( r1, r2, cond, branch_target); break;
1758 case 1: z_clrj( r1, r2, cond, branch_target); break;
1759 case 2: z_cgrj( r1, r2, cond, branch_target); break;
1760 case 3: z_clgrj(r1, r2, cond, branch_target); break;
1761 default: ShouldNotReachHere(); break;
1762 }
1763 } else {
1764 switch (casenum) {
1765 case 0: z_cr( r1, r2); break;
1766 case 1: z_clr(r1, r2); break;
1767 case 2: z_cgr(r1, r2); break;
1768 case 3: z_clgr(r1, r2); break;
1769 default: ShouldNotReachHere(); break;
1770 }
1771 branch_optimized(cond, branch_target);
1772 }
1773 }
1774 }
1775
1776 //===========================================================================
1777 //=== END H I G H E R L E V E L B R A N C H E M I T T E R S ===
1778 //===========================================================================
1779
1780 AddressLiteral MacroAssembler::allocate_metadata_address(Metadata* obj) {
1781 assert(oop_recorder() != NULL, "this assembler needs an OopRecorder");
1782 int index = oop_recorder()->allocate_metadata_index(obj);
1783 RelocationHolder rspec = metadata_Relocation::spec(index);
1784 return AddressLiteral((address)obj, rspec);
1785 }
1786
1787 AddressLiteral MacroAssembler::constant_metadata_address(Metadata* obj) {
1788 assert(oop_recorder() != NULL, "this assembler needs an OopRecorder");
1789 int index = oop_recorder()->find_index(obj);
1790 RelocationHolder rspec = metadata_Relocation::spec(index);
1791 return AddressLiteral((address)obj, rspec);
1792 }
1793
1794 AddressLiteral MacroAssembler::allocate_oop_address(jobject obj) {
1795 assert(oop_recorder() != NULL, "this assembler needs an OopRecorder");
1796 int oop_index = oop_recorder()->allocate_oop_index(obj);
1797 return AddressLiteral(address(obj), oop_Relocation::spec(oop_index));
1798 }
1799
1800 AddressLiteral MacroAssembler::constant_oop_address(jobject obj) {
1801 assert(oop_recorder() != NULL, "this assembler needs an OopRecorder");
1802 int oop_index = oop_recorder()->find_index(obj);
1803 return AddressLiteral(address(obj), oop_Relocation::spec(oop_index));
1804 }
1805
1806 // NOTE: destroys r
1807 void MacroAssembler::c2bool(Register r, Register t) {
1808 z_lcr(t, r); // t = -r
1809 z_or(r, t); // r = -r OR r
1810 z_srl(r, 31); // Yields 0 if r was 0, 1 otherwise.
1811 }
1812
1813 // Patch instruction `inst' at offset `inst_pos' to refer to `dest_pos'
1814 // and return the resulting instruction.
1815 // Dest_pos and inst_pos are 32 bit only. These parms can only designate
1816 // relative positions.
1817 // Use correct argument types. Do not pre-calculate distance.
1818 unsigned long MacroAssembler::patched_branch(address dest_pos, unsigned long inst, address inst_pos) {
1819 int c = 0;
1820 unsigned long patched_inst = 0;
1821 if (is_call_pcrelative_short(inst) ||
1822 is_branch_pcrelative_short(inst) ||
1823 is_branchoncount_pcrelative_short(inst) ||
1824 is_branchonindex32_pcrelative_short(inst)) {
1825 c = 1;
1826 int m = fmask(15, 0); // simm16(-1, 16, 32);
1827 int v = simm16(RelAddr::pcrel_off16(dest_pos, inst_pos), 16, 32);
1828 patched_inst = (inst & ~m) | v;
1829 } else if (is_compareandbranch_pcrelative_short(inst)) {
1830 c = 2;
1831 long m = fmask(31, 16); // simm16(-1, 16, 48);
1832 long v = simm16(RelAddr::pcrel_off16(dest_pos, inst_pos), 16, 48);
1833 patched_inst = (inst & ~m) | v;
1834 } else if (is_branchonindex64_pcrelative_short(inst)) {
1835 c = 3;
1836 long m = fmask(31, 16); // simm16(-1, 16, 48);
1837 long v = simm16(RelAddr::pcrel_off16(dest_pos, inst_pos), 16, 48);
1838 patched_inst = (inst & ~m) | v;
1839 } else if (is_call_pcrelative_long(inst) || is_branch_pcrelative_long(inst)) {
1840 c = 4;
1841 long m = fmask(31, 0); // simm32(-1, 16, 48);
1842 long v = simm32(RelAddr::pcrel_off32(dest_pos, inst_pos), 16, 48);
1843 patched_inst = (inst & ~m) | v;
1844 } else if (is_pcrelative_long(inst)) { // These are the non-branch pc-relative instructions.
1845 c = 5;
1846 long m = fmask(31, 0); // simm32(-1, 16, 48);
1847 long v = simm32(RelAddr::pcrel_off32(dest_pos, inst_pos), 16, 48);
1848 patched_inst = (inst & ~m) | v;
1849 } else {
1850 print_dbg_msg(tty, inst, "not a relative branch", 0);
1851 dump_code_range(tty, inst_pos, 32, "not a pcrelative branch");
1852 ShouldNotReachHere();
1853 }
1854
1855 long new_off = get_pcrel_offset(patched_inst);
1856 if (new_off != (dest_pos-inst_pos)) {
1857 tty->print_cr("case %d: dest_pos = %p, inst_pos = %p, disp = %ld(%12.12lx)", c, dest_pos, inst_pos, new_off, new_off);
1858 print_dbg_msg(tty, inst, "<- original instruction: branch patching error", 0);
1859 print_dbg_msg(tty, patched_inst, "<- patched instruction: branch patching error", 0);
1860 #ifdef LUCY_DBG
1861 VM_Version::z_SIGSEGV();
1862 #endif
1863 ShouldNotReachHere();
1864 }
1865 return patched_inst;
1866 }
1867
1868 // Only called when binding labels (share/vm/asm/assembler.cpp)
1869 // Pass arguments as intended. Do not pre-calculate distance.
1870 void MacroAssembler::pd_patch_instruction(address branch, address target, const char* file, int line) {
1871 unsigned long stub_inst;
1872 int inst_len = get_instruction(branch, &stub_inst);
1873
1874 set_instruction(branch, patched_branch(target, stub_inst, branch), inst_len);
1875 }
1876
1877
1878 // Extract relative address (aka offset).
1879 // inv_simm16 works for 4-byte instructions only.
1880 // compare and branch instructions are 6-byte and have a 16bit offset "in the middle".
1881 long MacroAssembler::get_pcrel_offset(unsigned long inst) {
1882
1883 if (MacroAssembler::is_pcrelative_short(inst)) {
1884 if (((inst&0xFFFFffff00000000UL) == 0) && ((inst&0x00000000FFFF0000UL) != 0)) {
1885 return RelAddr::inv_pcrel_off16(inv_simm16(inst));
1886 } else {
1887 return RelAddr::inv_pcrel_off16(inv_simm16_48(inst));
1888 }
1889 }
1890
1891 if (MacroAssembler::is_pcrelative_long(inst)) {
1892 return RelAddr::inv_pcrel_off32(inv_simm32(inst));
1893 }
1894
1895 print_dbg_msg(tty, inst, "not a pcrelative instruction", 6);
1896 #ifdef LUCY_DBG
1897 VM_Version::z_SIGSEGV();
1898 #else
1899 ShouldNotReachHere();
1900 #endif
1901 return -1;
1902 }
1903
1904 long MacroAssembler::get_pcrel_offset(address pc) {
1905 unsigned long inst;
1906 unsigned int len = get_instruction(pc, &inst);
1907
1908 #ifdef ASSERT
1909 long offset;
1910 if (MacroAssembler::is_pcrelative_short(inst) || MacroAssembler::is_pcrelative_long(inst)) {
1911 offset = get_pcrel_offset(inst);
1912 } else {
1913 offset = -1;
1914 }
1915
1916 if (offset == -1) {
1917 dump_code_range(tty, pc, 32, "not a pcrelative instruction");
1918 #ifdef LUCY_DBG
1919 VM_Version::z_SIGSEGV();
1920 #else
1921 ShouldNotReachHere();
1922 #endif
1923 }
1924 return offset;
1925 #else
1926 return get_pcrel_offset(inst);
1927 #endif // ASSERT
1928 }
1929
1930 // Get target address from pc-relative instructions.
1931 address MacroAssembler::get_target_addr_pcrel(address pc) {
1932 assert(is_pcrelative_long(pc), "not a pcrelative instruction");
1933 return pc + get_pcrel_offset(pc);
1934 }
1935
1936 // Patch pc relative load address.
1937 void MacroAssembler::patch_target_addr_pcrel(address pc, address con) {
1938 unsigned long inst;
1939 // Offset is +/- 2**32 -> use long.
1940 ptrdiff_t distance = con - pc;
1941
1942 get_instruction(pc, &inst);
1943
1944 if (is_pcrelative_short(inst)) {
1945 *(short *)(pc+2) = RelAddr::pcrel_off16(con, pc); // Instructions are at least 2-byte aligned, no test required.
1946
1947 // Some extra safety net.
1948 if (!RelAddr::is_in_range_of_RelAddr16(distance)) {
1949 print_dbg_msg(tty, inst, "distance out of range (16bit)", 4);
1950 dump_code_range(tty, pc, 32, "distance out of range (16bit)");
1951 guarantee(RelAddr::is_in_range_of_RelAddr16(distance), "too far away (more than +/- 2**16");
1952 }
1953 return;
1954 }
1955
1956 if (is_pcrelative_long(inst)) {
1957 *(int *)(pc+2) = RelAddr::pcrel_off32(con, pc);
1958
1959 // Some Extra safety net.
1960 if (!RelAddr::is_in_range_of_RelAddr32(distance)) {
1961 print_dbg_msg(tty, inst, "distance out of range (32bit)", 6);
1962 dump_code_range(tty, pc, 32, "distance out of range (32bit)");
1963 guarantee(RelAddr::is_in_range_of_RelAddr32(distance), "too far away (more than +/- 2**32");
1964 }
1965 return;
1966 }
1967
1968 guarantee(false, "not a pcrelative instruction to patch!");
1969 }
1970
1971 // "Current PC" here means the address just behind the basr instruction.
1972 address MacroAssembler::get_PC(Register result) {
1973 z_basr(result, Z_R0); // Don't branch, just save next instruction address in result.
1974 return pc();
1975 }
1976
1977 // Get current PC + offset.
1978 // Offset given in bytes, must be even!
1979 // "Current PC" here means the address of the larl instruction plus the given offset.
1980 address MacroAssembler::get_PC(Register result, int64_t offset) {
1981 address here = pc();
1982 z_larl(result, offset/2); // Save target instruction address in result.
1983 return here + offset;
1984 }
1985
1986 void MacroAssembler::instr_size(Register size, Register pc) {
1987 // Extract 2 most significant bits of current instruction.
1988 z_llgc(size, Address(pc));
1989 z_srl(size, 6);
1990 // Compute (x+3)&6 which translates 0->2, 1->4, 2->4, 3->6.
1991 z_ahi(size, 3);
1992 z_nill(size, 6);
1993 }
1994
1995 // Resize_frame with SP(new) = SP(old) - [offset].
1996 void MacroAssembler::resize_frame_sub(Register offset, Register fp, bool load_fp)
1997 {
1998 assert_different_registers(offset, fp, Z_SP);
1999 if (load_fp) { z_lg(fp, _z_abi(callers_sp), Z_SP); }
2000
2001 z_sgr(Z_SP, offset);
2002 z_stg(fp, _z_abi(callers_sp), Z_SP);
2003 }
2004
2005 // Resize_frame with SP(new) = [newSP] + offset.
2006 // This emitter is useful if we already have calculated a pointer
2007 // into the to-be-allocated stack space, e.g. with special alignment properties,
2008 // but need some additional space, e.g. for spilling.
2009 // newSP is the pre-calculated pointer. It must not be modified.
2010 // fp holds, or is filled with, the frame pointer.
2011 // offset is the additional increment which is added to addr to form the new SP.
2012 // Note: specify a negative value to reserve more space!
2013 // load_fp == true only indicates that fp is not pre-filled with the frame pointer.
2014 // It does not guarantee that fp contains the frame pointer at the end.
2015 void MacroAssembler::resize_frame_abs_with_offset(Register newSP, Register fp, int offset, bool load_fp) {
2016 assert_different_registers(newSP, fp, Z_SP);
2017
2018 if (load_fp) {
2019 z_lg(fp, _z_abi(callers_sp), Z_SP);
2020 }
2021
2022 add2reg(Z_SP, offset, newSP);
2023 z_stg(fp, _z_abi(callers_sp), Z_SP);
2024 }
2025
2026 // Resize_frame with SP(new) = [newSP].
2027 // load_fp == true only indicates that fp is not pre-filled with the frame pointer.
2028 // It does not guarantee that fp contains the frame pointer at the end.
2029 void MacroAssembler::resize_frame_absolute(Register newSP, Register fp, bool load_fp) {
2030 assert_different_registers(newSP, fp, Z_SP);
2031
2032 if (load_fp) {
2033 z_lg(fp, _z_abi(callers_sp), Z_SP); // need to use load/store.
2034 }
2035
2036 z_lgr(Z_SP, newSP);
2037 if (newSP != Z_R0) { // make sure we generate correct code, no matter what register newSP uses.
2038 z_stg(fp, _z_abi(callers_sp), newSP);
2039 } else {
2040 z_stg(fp, _z_abi(callers_sp), Z_SP);
2041 }
2042 }
2043
2044 // Resize_frame with SP(new) = SP(old) + offset.
2045 void MacroAssembler::resize_frame(RegisterOrConstant offset, Register fp, bool load_fp) {
2046 assert_different_registers(fp, Z_SP);
2047
2048 if (load_fp) {
2049 z_lg(fp, _z_abi(callers_sp), Z_SP);
2050 }
2051 add64(Z_SP, offset);
2052 z_stg(fp, _z_abi(callers_sp), Z_SP);
2053 }
2054
2055 void MacroAssembler::push_frame(Register bytes, Register old_sp, bool copy_sp, bool bytes_with_inverted_sign) {
2056 #ifdef ASSERT
2057 assert_different_registers(bytes, old_sp, Z_SP);
2058 if (!copy_sp) {
2059 z_cgr(old_sp, Z_SP);
2060 asm_assert_eq("[old_sp]!=[Z_SP]", 0x211);
2061 }
2062 #endif
2063 if (copy_sp) { z_lgr(old_sp, Z_SP); }
2064 if (bytes_with_inverted_sign) {
2065 z_agr(Z_SP, bytes);
2066 } else {
2067 z_sgr(Z_SP, bytes); // Z_sgfr sufficient, but probably not faster.
2068 }
2069 z_stg(old_sp, _z_abi(callers_sp), Z_SP);
2070 }
2071
2072 unsigned int MacroAssembler::push_frame(unsigned int bytes, Register scratch) {
2073 long offset = Assembler::align(bytes, frame::alignment_in_bytes);
2074 assert(offset > 0, "should push a frame with positive size, size = %ld.", offset);
2075 assert(Displacement::is_validDisp(-offset), "frame size out of range, size = %ld", offset);
2076
2077 // We must not write outside the current stack bounds (given by Z_SP).
2078 // Thus, we have to first update Z_SP and then store the previous SP as stack linkage.
2079 // We rely on Z_R0 by default to be available as scratch.
2080 z_lgr(scratch, Z_SP);
2081 add2reg(Z_SP, -offset);
2082 z_stg(scratch, _z_abi(callers_sp), Z_SP);
2083 #ifdef ASSERT
2084 // Just make sure nobody uses the value in the default scratch register.
2085 // When another register is used, the caller might rely on it containing the frame pointer.
2086 if (scratch == Z_R0) {
2087 z_iihf(scratch, 0xbaadbabe);
2088 z_iilf(scratch, 0xdeadbeef);
2089 }
2090 #endif
2091 return offset;
2092 }
2093
2094 // Push a frame of size `bytes' plus abi160 on top.
2095 unsigned int MacroAssembler::push_frame_abi160(unsigned int bytes) {
2096 BLOCK_COMMENT("push_frame_abi160 {");
2097 unsigned int res = push_frame(bytes + frame::z_abi_160_size);
2098 BLOCK_COMMENT("} push_frame_abi160");
2099 return res;
2100 }
2101
2102 // Pop current C frame.
2103 void MacroAssembler::pop_frame() {
2104 BLOCK_COMMENT("pop_frame:");
2105 Assembler::z_lg(Z_SP, _z_abi(callers_sp), Z_SP);
2106 }
2107
2108 // Pop current C frame and restore return PC register (Z_R14).
2109 void MacroAssembler::pop_frame_restore_retPC(int frame_size_in_bytes) {
2110 BLOCK_COMMENT("pop_frame_restore_retPC:");
2111 int retPC_offset = _z_abi16(return_pc) + frame_size_in_bytes;
2112 // If possible, pop frame by add instead of load (a penny saved is a penny got :-).
2113 if (Displacement::is_validDisp(retPC_offset)) {
2114 z_lg(Z_R14, retPC_offset, Z_SP);
2115 add2reg(Z_SP, frame_size_in_bytes);
2116 } else {
2117 add2reg(Z_SP, frame_size_in_bytes);
2118 restore_return_pc();
2119 }
2120 }
2121
2122 void MacroAssembler::call_VM_leaf_base(address entry_point, bool allow_relocation) {
2123 if (allow_relocation) {
2124 call_c(entry_point);
2125 } else {
2126 call_c_static(entry_point);
2127 }
2128 }
2129
2130 void MacroAssembler::call_VM_leaf_base(address entry_point) {
2131 bool allow_relocation = true;
2132 call_VM_leaf_base(entry_point, allow_relocation);
2133 }
2134
2135 void MacroAssembler::call_VM_base(Register oop_result,
2136 Register last_java_sp,
2137 address entry_point,
2138 bool allow_relocation,
2139 bool check_exceptions) { // Defaults to true.
2140 // Allow_relocation indicates, if true, that the generated code shall
2141 // be fit for code relocation or referenced data relocation. In other
2142 // words: all addresses must be considered variable. PC-relative addressing
2143 // is not possible then.
2144 // On the other hand, if (allow_relocation == false), addresses and offsets
2145 // may be considered stable, enabling us to take advantage of some PC-relative
2146 // addressing tweaks. These might improve performance and reduce code size.
2147
2148 // Determine last_java_sp register.
2149 if (!last_java_sp->is_valid()) {
2150 last_java_sp = Z_SP; // Load Z_SP as SP.
2151 }
2152
2153 set_top_ijava_frame_at_SP_as_last_Java_frame(last_java_sp, Z_R1, allow_relocation);
2154
2155 // ARG1 must hold thread address.
2156 z_lgr(Z_ARG1, Z_thread);
2157
2158 address return_pc = NULL;
2159 if (allow_relocation) {
2160 return_pc = call_c(entry_point);
2161 } else {
2162 return_pc = call_c_static(entry_point);
2163 }
2164
2165 reset_last_Java_frame(allow_relocation);
2166
2167 // C++ interp handles this in the interpreter.
2168 check_and_handle_popframe(Z_thread);
2169 check_and_handle_earlyret(Z_thread);
2170
2171 // Check for pending exceptions.
2172 if (check_exceptions) {
2173 // Check for pending exceptions (java_thread is set upon return).
2174 load_and_test_long(Z_R0_scratch, Address(Z_thread, Thread::pending_exception_offset()));
2175
2176 // This used to conditionally jump to forward_exception however it is
2177 // possible if we relocate that the branch will not reach. So we must jump
2178 // around so we can always reach.
2179
2180 Label ok;
2181 z_bre(ok); // Bcondequal is the same as bcondZero.
2182 call_stub(StubRoutines::forward_exception_entry());
2183 bind(ok);
2184 }
2185
2186 // Get oop result if there is one and reset the value in the thread.
2187 if (oop_result->is_valid()) {
2188 get_vm_result(oop_result);
2189 }
2190
2191 _last_calls_return_pc = return_pc; // Wipe out other (error handling) calls.
2192 }
2193
2194 void MacroAssembler::call_VM_base(Register oop_result,
2195 Register last_java_sp,
2196 address entry_point,
2197 bool check_exceptions) { // Defaults to true.
2198 bool allow_relocation = true;
2199 call_VM_base(oop_result, last_java_sp, entry_point, allow_relocation, check_exceptions);
2200 }
2201
2202 // VM calls without explicit last_java_sp.
2203
2204 void MacroAssembler::call_VM(Register oop_result, address entry_point, bool check_exceptions) {
2205 // Call takes possible detour via InterpreterMacroAssembler.
2206 call_VM_base(oop_result, noreg, entry_point, true, check_exceptions);
2207 }
2208
2209 void MacroAssembler::call_VM(Register oop_result, address entry_point, Register arg_1, bool check_exceptions) {
2210 // Z_ARG1 is reserved for the thread.
2211 lgr_if_needed(Z_ARG2, arg_1);
2212 call_VM(oop_result, entry_point, check_exceptions);
2213 }
2214
2215 void MacroAssembler::call_VM(Register oop_result, address entry_point, Register arg_1, Register arg_2, bool check_exceptions) {
2216 // Z_ARG1 is reserved for the thread.
2217 lgr_if_needed(Z_ARG2, arg_1);
2218 assert(arg_2 != Z_ARG2, "smashed argument");
2219 lgr_if_needed(Z_ARG3, arg_2);
2220 call_VM(oop_result, entry_point, check_exceptions);
2221 }
2222
2223 void MacroAssembler::call_VM(Register oop_result, address entry_point, Register arg_1, Register arg_2,
2224 Register arg_3, bool check_exceptions) {
2225 // Z_ARG1 is reserved for the thread.
2226 lgr_if_needed(Z_ARG2, arg_1);
2227 assert(arg_2 != Z_ARG2, "smashed argument");
2228 lgr_if_needed(Z_ARG3, arg_2);
2229 assert(arg_3 != Z_ARG2 && arg_3 != Z_ARG3, "smashed argument");
2230 lgr_if_needed(Z_ARG4, arg_3);
2231 call_VM(oop_result, entry_point, check_exceptions);
2232 }
2233
2234 // VM static calls without explicit last_java_sp.
2235
2236 void MacroAssembler::call_VM_static(Register oop_result, address entry_point, bool check_exceptions) {
2237 // Call takes possible detour via InterpreterMacroAssembler.
2238 call_VM_base(oop_result, noreg, entry_point, false, check_exceptions);
2239 }
2240
2241 void MacroAssembler::call_VM_static(Register oop_result, address entry_point, Register arg_1, Register arg_2,
2242 Register arg_3, bool check_exceptions) {
2243 // Z_ARG1 is reserved for the thread.
2244 lgr_if_needed(Z_ARG2, arg_1);
2245 assert(arg_2 != Z_ARG2, "smashed argument");
2246 lgr_if_needed(Z_ARG3, arg_2);
2247 assert(arg_3 != Z_ARG2 && arg_3 != Z_ARG3, "smashed argument");
2248 lgr_if_needed(Z_ARG4, arg_3);
2249 call_VM_static(oop_result, entry_point, check_exceptions);
2250 }
2251
2252 // VM calls with explicit last_java_sp.
2253
2254 void MacroAssembler::call_VM(Register oop_result, Register last_java_sp, address entry_point, bool check_exceptions) {
2255 // Call takes possible detour via InterpreterMacroAssembler.
2256 call_VM_base(oop_result, last_java_sp, entry_point, true, check_exceptions);
2257 }
2258
2259 void MacroAssembler::call_VM(Register oop_result, Register last_java_sp, address entry_point, Register arg_1, bool check_exceptions) {
2260 // Z_ARG1 is reserved for the thread.
2261 lgr_if_needed(Z_ARG2, arg_1);
2262 call_VM(oop_result, last_java_sp, entry_point, check_exceptions);
2263 }
2264
2265 void MacroAssembler::call_VM(Register oop_result, Register last_java_sp, address entry_point, Register arg_1,
2266 Register arg_2, bool check_exceptions) {
2267 // Z_ARG1 is reserved for the thread.
2268 lgr_if_needed(Z_ARG2, arg_1);
2269 assert(arg_2 != Z_ARG2, "smashed argument");
2270 lgr_if_needed(Z_ARG3, arg_2);
2271 call_VM(oop_result, last_java_sp, entry_point, check_exceptions);
2272 }
2273
2274 void MacroAssembler::call_VM(Register oop_result, Register last_java_sp, address entry_point, Register arg_1,
2275 Register arg_2, Register arg_3, bool check_exceptions) {
2276 // Z_ARG1 is reserved for the thread.
2277 lgr_if_needed(Z_ARG2, arg_1);
2278 assert(arg_2 != Z_ARG2, "smashed argument");
2279 lgr_if_needed(Z_ARG3, arg_2);
2280 assert(arg_3 != Z_ARG2 && arg_3 != Z_ARG3, "smashed argument");
2281 lgr_if_needed(Z_ARG4, arg_3);
2282 call_VM(oop_result, last_java_sp, entry_point, check_exceptions);
2283 }
2284
2285 // VM leaf calls.
2286
2287 void MacroAssembler::call_VM_leaf(address entry_point) {
2288 // Call takes possible detour via InterpreterMacroAssembler.
2289 call_VM_leaf_base(entry_point, true);
2290 }
2291
2292 void MacroAssembler::call_VM_leaf(address entry_point, Register arg_1) {
2293 if (arg_1 != noreg) lgr_if_needed(Z_ARG1, arg_1);
2294 call_VM_leaf(entry_point);
2295 }
2296
2297 void MacroAssembler::call_VM_leaf(address entry_point, Register arg_1, Register arg_2) {
2298 if (arg_1 != noreg) lgr_if_needed(Z_ARG1, arg_1);
2299 assert(arg_2 != Z_ARG1, "smashed argument");
2300 if (arg_2 != noreg) lgr_if_needed(Z_ARG2, arg_2);
2301 call_VM_leaf(entry_point);
2302 }
2303
2304 void MacroAssembler::call_VM_leaf(address entry_point, Register arg_1, Register arg_2, Register arg_3) {
2305 if (arg_1 != noreg) lgr_if_needed(Z_ARG1, arg_1);
2306 assert(arg_2 != Z_ARG1, "smashed argument");
2307 if (arg_2 != noreg) lgr_if_needed(Z_ARG2, arg_2);
2308 assert(arg_3 != Z_ARG1 && arg_3 != Z_ARG2, "smashed argument");
2309 if (arg_3 != noreg) lgr_if_needed(Z_ARG3, arg_3);
2310 call_VM_leaf(entry_point);
2311 }
2312
2313 // Static VM leaf calls.
2314 // Really static VM leaf calls are never patched.
2315
2316 void MacroAssembler::call_VM_leaf_static(address entry_point) {
2317 // Call takes possible detour via InterpreterMacroAssembler.
2318 call_VM_leaf_base(entry_point, false);
2319 }
2320
2321 void MacroAssembler::call_VM_leaf_static(address entry_point, Register arg_1) {
2322 if (arg_1 != noreg) lgr_if_needed(Z_ARG1, arg_1);
2323 call_VM_leaf_static(entry_point);
2324 }
2325
2326 void MacroAssembler::call_VM_leaf_static(address entry_point, Register arg_1, Register arg_2) {
2327 if (arg_1 != noreg) lgr_if_needed(Z_ARG1, arg_1);
2328 assert(arg_2 != Z_ARG1, "smashed argument");
2329 if (arg_2 != noreg) lgr_if_needed(Z_ARG2, arg_2);
2330 call_VM_leaf_static(entry_point);
2331 }
2332
2333 void MacroAssembler::call_VM_leaf_static(address entry_point, Register arg_1, Register arg_2, Register arg_3) {
2334 if (arg_1 != noreg) lgr_if_needed(Z_ARG1, arg_1);
2335 assert(arg_2 != Z_ARG1, "smashed argument");
2336 if (arg_2 != noreg) lgr_if_needed(Z_ARG2, arg_2);
2337 assert(arg_3 != Z_ARG1 && arg_3 != Z_ARG2, "smashed argument");
2338 if (arg_3 != noreg) lgr_if_needed(Z_ARG3, arg_3);
2339 call_VM_leaf_static(entry_point);
2340 }
2341
2342 // Don't use detour via call_c(reg).
2343 address MacroAssembler::call_c(address function_entry) {
2344 load_const(Z_R1, function_entry);
2345 return call(Z_R1);
2346 }
2347
2348 // Variant for really static (non-relocatable) calls which are never patched.
2349 address MacroAssembler::call_c_static(address function_entry) {
2350 load_absolute_address(Z_R1, function_entry);
2351 #if 0 // def ASSERT
2352 // Verify that call site did not move.
2353 load_const_optimized(Z_R0, function_entry);
2354 z_cgr(Z_R1, Z_R0);
2355 z_brc(bcondEqual, 3);
2356 z_illtrap(0xba);
2357 #endif
2358 return call(Z_R1);
2359 }
2360
2361 address MacroAssembler::call_c_opt(address function_entry) {
2362 bool success = call_far_patchable(function_entry, -2 /* emit relocation + constant */);
2363 _last_calls_return_pc = success ? pc() : NULL;
2364 return _last_calls_return_pc;
2365 }
2366
2367 // Identify a call_far_patchable instruction: LARL + LG + BASR
2368 //
2369 // nop ; optionally, if required for alignment
2370 // lgrl rx,A(TOC entry) ; PC-relative access into constant pool
2371 // basr Z_R14,rx ; end of this instruction must be aligned to a word boundary
2372 //
2373 // Code pattern will eventually get patched into variant2 (see below for detection code).
2374 //
2375 bool MacroAssembler::is_call_far_patchable_variant0_at(address instruction_addr) {
2376 address iaddr = instruction_addr;
2377
2378 // Check for the actual load instruction.
2379 if (!is_load_const_from_toc(iaddr)) { return false; }
2380 iaddr += load_const_from_toc_size();
2381
2382 // Check for the call (BASR) instruction, finally.
2383 assert(iaddr-instruction_addr+call_byregister_size() == call_far_patchable_size(), "size mismatch");
2384 return is_call_byregister(iaddr);
2385 }
2386
2387 // Identify a call_far_patchable instruction: BRASL
2388 //
2389 // Code pattern to suits atomic patching:
2390 // nop ; Optionally, if required for alignment.
2391 // nop ... ; Multiple filler nops to compensate for size difference (variant0 is longer).
2392 // nop ; For code pattern detection: Prepend each BRASL with a nop.
2393 // brasl Z_R14,<reladdr> ; End of code must be 4-byte aligned !
2394 bool MacroAssembler::is_call_far_patchable_variant2_at(address instruction_addr) {
2395 const address call_addr = (address)((intptr_t)instruction_addr + call_far_patchable_size() - call_far_pcrelative_size());
2396
2397 // Check for correct number of leading nops.
2398 address iaddr;
2399 for (iaddr = instruction_addr; iaddr < call_addr; iaddr += nop_size()) {
2400 if (!is_z_nop(iaddr)) { return false; }
2401 }
2402 assert(iaddr == call_addr, "sanity");
2403
2404 // --> Check for call instruction.
2405 if (is_call_far_pcrelative(call_addr)) {
2406 assert(call_addr-instruction_addr+call_far_pcrelative_size() == call_far_patchable_size(), "size mismatch");
2407 return true;
2408 }
2409
2410 return false;
2411 }
2412
2413 // Emit a NOT mt-safely patchable 64 bit absolute call.
2414 // If toc_offset == -2, then the destination of the call (= target) is emitted
2415 // to the constant pool and a runtime_call relocation is added
2416 // to the code buffer.
2417 // If toc_offset != -2, target must already be in the constant pool at
2418 // _ctableStart+toc_offset (a caller can retrieve toc_offset
2419 // from the runtime_call relocation).
2420 // Special handling of emitting to scratch buffer when there is no constant pool.
2421 // Slightly changed code pattern. We emit an additional nop if we would
2422 // not end emitting at a word aligned address. This is to ensure
2423 // an atomically patchable displacement in brasl instructions.
2424 //
2425 // A call_far_patchable comes in different flavors:
2426 // - LARL(CP) / LG(CP) / BR (address in constant pool, access via CP register)
2427 // - LGRL(CP) / BR (address in constant pool, pc-relative access)
2428 // - BRASL (relative address of call target coded in instruction)
2429 // All flavors occupy the same amount of space. Length differences are compensated
2430 // by leading nops, such that the instruction sequence always ends at the same
2431 // byte offset. This is required to keep the return offset constant.
2432 // Furthermore, the return address (the end of the instruction sequence) is forced
2433 // to be on a 4-byte boundary. This is required for atomic patching, should we ever
2434 // need to patch the call target of the BRASL flavor.
2435 // RETURN value: false, if no constant pool entry could be allocated, true otherwise.
2436 bool MacroAssembler::call_far_patchable(address target, int64_t tocOffset) {
2437 // Get current pc and ensure word alignment for end of instr sequence.
2438 const address start_pc = pc();
2439 const intptr_t start_off = offset();
2440 assert(!call_far_patchable_requires_alignment_nop(start_pc), "call_far_patchable requires aligned address");
2441 const ptrdiff_t dist = (ptrdiff_t)(target - (start_pc + 2)); // Prepend each BRASL with a nop.
2442 const bool emit_target_to_pool = (tocOffset == -2) && !code_section()->scratch_emit();
2443 const bool emit_relative_call = !emit_target_to_pool &&
2444 RelAddr::is_in_range_of_RelAddr32(dist) &&
2445 ReoptimizeCallSequences &&
2446 !code_section()->scratch_emit();
2447
2448 if (emit_relative_call) {
2449 // Add padding to get the same size as below.
2450 const unsigned int padding = call_far_patchable_size() - call_far_pcrelative_size();
2451 unsigned int current_padding;
2452 for (current_padding = 0; current_padding < padding; current_padding += nop_size()) { z_nop(); }
2453 assert(current_padding == padding, "sanity");
2454
2455 // relative call: len = 2(nop) + 6 (brasl)
2456 // CodeBlob resize cannot occur in this case because
2457 // this call is emitted into pre-existing space.
2458 z_nop(); // Prepend each BRASL with a nop.
2459 z_brasl(Z_R14, target);
2460 } else {
2461 // absolute call: Get address from TOC.
2462 // len = (load TOC){6|0} + (load from TOC){6} + (basr){2} = {14|8}
2463 if (emit_target_to_pool) {
2464 // When emitting the call for the first time, we do not need to use
2465 // the pc-relative version. It will be patched anyway, when the code
2466 // buffer is copied.
2467 // Relocation is not needed when !ReoptimizeCallSequences.
2468 relocInfo::relocType rt = ReoptimizeCallSequences ? relocInfo::runtime_call_w_cp_type : relocInfo::none;
2469 AddressLiteral dest(target, rt);
2470 // Store_oop_in_toc() adds dest to the constant table. As side effect, this kills
2471 // inst_mark(). Reset if possible.
2472 bool reset_mark = (inst_mark() == pc());
2473 tocOffset = store_oop_in_toc(dest);
2474 if (reset_mark) { set_inst_mark(); }
2475 if (tocOffset == -1) {
2476 return false; // Couldn't create constant pool entry.
2477 }
2478 }
2479 assert(offset() == start_off, "emit no code before this point!");
2480
2481 address tocPos = pc() + tocOffset;
2482 if (emit_target_to_pool) {
2483 tocPos = code()->consts()->start() + tocOffset;
2484 }
2485 load_long_pcrelative(Z_R14, tocPos);
2486 z_basr(Z_R14, Z_R14);
2487 }
2488
2489 #ifdef ASSERT
2490 // Assert that we can identify the emitted call.
2491 assert(is_call_far_patchable_at(addr_at(start_off)), "can't identify emitted call");
2492 assert(offset() == start_off+call_far_patchable_size(), "wrong size");
2493
2494 if (emit_target_to_pool) {
2495 assert(get_dest_of_call_far_patchable_at(addr_at(start_off), code()->consts()->start()) == target,
2496 "wrong encoding of dest address");
2497 }
2498 #endif
2499 return true; // success
2500 }
2501
2502 // Identify a call_far_patchable instruction.
2503 // For more detailed information see header comment of call_far_patchable.
2504 bool MacroAssembler::is_call_far_patchable_at(address instruction_addr) {
2505 return is_call_far_patchable_variant2_at(instruction_addr) || // short version: BRASL
2506 is_call_far_patchable_variant0_at(instruction_addr); // long version LARL + LG + BASR
2507 }
2508
2509 // Does the call_far_patchable instruction use a pc-relative encoding
2510 // of the call destination?
2511 bool MacroAssembler::is_call_far_patchable_pcrelative_at(address instruction_addr) {
2512 // Variant 2 is pc-relative.
2513 return is_call_far_patchable_variant2_at(instruction_addr);
2514 }
2515
2516 bool MacroAssembler::is_call_far_pcrelative(address instruction_addr) {
2517 // Prepend each BRASL with a nop.
2518 return is_z_nop(instruction_addr) && is_z_brasl(instruction_addr + nop_size()); // Match at position after one nop required.
2519 }
2520
2521 // Set destination address of a call_far_patchable instruction.
2522 void MacroAssembler::set_dest_of_call_far_patchable_at(address instruction_addr, address dest, int64_t tocOffset) {
2523 ResourceMark rm;
2524
2525 // Now that CP entry is verified, patch call to a pc-relative call (if circumstances permit).
2526 int code_size = MacroAssembler::call_far_patchable_size();
2527 CodeBuffer buf(instruction_addr, code_size);
2528 MacroAssembler masm(&buf);
2529 masm.call_far_patchable(dest, tocOffset);
2530 ICache::invalidate_range(instruction_addr, code_size); // Empty on z.
2531 }
2532
2533 // Get dest address of a call_far_patchable instruction.
2534 address MacroAssembler::get_dest_of_call_far_patchable_at(address instruction_addr, address ctable) {
2535 // Dynamic TOC: absolute address in constant pool.
2536 // Check variant2 first, it is more frequent.
2537
2538 // Relative address encoded in call instruction.
2539 if (is_call_far_patchable_variant2_at(instruction_addr)) {
2540 return MacroAssembler::get_target_addr_pcrel(instruction_addr + nop_size()); // Prepend each BRASL with a nop.
2541
2542 // Absolute address in constant pool.
2543 } else if (is_call_far_patchable_variant0_at(instruction_addr)) {
2544 address iaddr = instruction_addr;
2545
2546 long tocOffset = get_load_const_from_toc_offset(iaddr);
2547 address tocLoc = iaddr + tocOffset;
2548 return *(address *)(tocLoc);
2549 } else {
2550 fprintf(stderr, "MacroAssembler::get_dest_of_call_far_patchable_at has a problem at %p:\n", instruction_addr);
2551 fprintf(stderr, "not a call_far_patchable: %16.16lx %16.16lx, len = %d\n",
2552 *(unsigned long*)instruction_addr,
2553 *(unsigned long*)(instruction_addr+8),
2554 call_far_patchable_size());
2555 Disassembler::decode(instruction_addr, instruction_addr+call_far_patchable_size());
2556 ShouldNotReachHere();
2557 return NULL;
2558 }
2559 }
2560
2561 void MacroAssembler::align_call_far_patchable(address pc) {
2562 if (call_far_patchable_requires_alignment_nop(pc)) { z_nop(); }
2563 }
2564
2565 void MacroAssembler::check_and_handle_earlyret(Register java_thread) {
2566 }
2567
2568 void MacroAssembler::check_and_handle_popframe(Register java_thread) {
2569 }
2570
2571 // Read from the polling page.
2572 // Use TM or TMY instruction, depending on read offset.
2573 // offset = 0: Use TM, safepoint polling.
2574 // offset < 0: Use TMY, profiling safepoint polling.
2575 void MacroAssembler::load_from_polling_page(Register polling_page_address, int64_t offset) {
2576 if (Immediate::is_uimm12(offset)) {
2577 z_tm(offset, polling_page_address, mask_safepoint);
2578 } else {
2579 z_tmy(offset, polling_page_address, mask_profiling);
2580 }
2581 }
2582
2583 // Check whether z_instruction is a read access to the polling page
2584 // which was emitted by load_from_polling_page(..).
2585 bool MacroAssembler::is_load_from_polling_page(address instr_loc) {
2586 unsigned long z_instruction;
2587 unsigned int ilen = get_instruction(instr_loc, &z_instruction);
2588
2589 if (ilen == 2) { return false; } // It's none of the allowed instructions.
2590
2591 if (ilen == 4) {
2592 if (!is_z_tm(z_instruction)) { return false; } // It's len=4, but not a z_tm. fail.
2593
2594 int ms = inv_mask(z_instruction,8,32); // mask
2595 int ra = inv_reg(z_instruction,16,32); // base register
2596 int ds = inv_uimm12(z_instruction); // displacement
2597
2598 if (!(ds == 0 && ra != 0 && ms == mask_safepoint)) {
2599 return false; // It's not a z_tm(0, ra, mask_safepoint). Fail.
2600 }
2601
2602 } else { /* if (ilen == 6) */
2603
2604 assert(!is_z_lg(z_instruction), "old form (LG) polling page access. Please fix and use TM(Y).");
2605
2606 if (!is_z_tmy(z_instruction)) { return false; } // It's len=6, but not a z_tmy. fail.
2607
2608 int ms = inv_mask(z_instruction,8,48); // mask
2609 int ra = inv_reg(z_instruction,16,48); // base register
2610 int ds = inv_simm20(z_instruction); // displacement
2611 }
2612
2613 return true;
2614 }
2615
2616 // Extract poll address from instruction and ucontext.
2617 address MacroAssembler::get_poll_address(address instr_loc, void* ucontext) {
2618 assert(ucontext != NULL, "must have ucontext");
2619 ucontext_t* uc = (ucontext_t*) ucontext;
2620 unsigned long z_instruction;
2621 unsigned int ilen = get_instruction(instr_loc, &z_instruction);
2622
2623 if (ilen == 4 && is_z_tm(z_instruction)) {
2624 int ra = inv_reg(z_instruction, 16, 32); // base register
2625 int ds = inv_uimm12(z_instruction); // displacement
2626 address addr = (address)uc->uc_mcontext.gregs[ra];
2627 return addr + ds;
2628 } else if (ilen == 6 && is_z_tmy(z_instruction)) {
2629 int ra = inv_reg(z_instruction, 16, 48); // base register
2630 int ds = inv_simm20(z_instruction); // displacement
2631 address addr = (address)uc->uc_mcontext.gregs[ra];
2632 return addr + ds;
2633 }
2634
2635 ShouldNotReachHere();
2636 return NULL;
2637 }
2638
2639 // Extract poll register from instruction.
2640 uint MacroAssembler::get_poll_register(address instr_loc) {
2641 unsigned long z_instruction;
2642 unsigned int ilen = get_instruction(instr_loc, &z_instruction);
2643
2644 if (ilen == 4 && is_z_tm(z_instruction)) {
2645 return (uint)inv_reg(z_instruction, 16, 32); // base register
2646 } else if (ilen == 6 && is_z_tmy(z_instruction)) {
2647 return (uint)inv_reg(z_instruction, 16, 48); // base register
2648 }
2649
2650 ShouldNotReachHere();
2651 return 0;
2652 }
2653
2654 void MacroAssembler::safepoint_poll(Label& slow_path, Register temp_reg) {
2655 const Address poll_byte_addr(Z_thread, in_bytes(JavaThread::polling_word_offset()) + 7 /* Big Endian */);
2656 // Armed page has poll_bit set.
2657 z_tm(poll_byte_addr, SafepointMechanism::poll_bit());
2658 z_brnaz(slow_path);
2659 }
2660
2661 // Don't rely on register locking, always use Z_R1 as scratch register instead.
2662 void MacroAssembler::bang_stack_with_offset(int offset) {
2663 // Stack grows down, caller passes positive offset.
2664 assert(offset > 0, "must bang with positive offset");
2665 if (Displacement::is_validDisp(-offset)) {
2666 z_tmy(-offset, Z_SP, mask_stackbang);
2667 } else {
2668 add2reg(Z_R1, -offset, Z_SP); // Do not destroy Z_SP!!!
2669 z_tm(0, Z_R1, mask_stackbang); // Just banging.
2670 }
2671 }
2672
2673 void MacroAssembler::reserved_stack_check(Register return_pc) {
2674 // Test if reserved zone needs to be enabled.
2675 Label no_reserved_zone_enabling;
2676 assert(return_pc == Z_R14, "Return pc must be in R14 before z_br() to StackOverflow stub.");
2677 BLOCK_COMMENT("reserved_stack_check {");
2678
2679 z_clg(Z_SP, Address(Z_thread, JavaThread::reserved_stack_activation_offset()));
2680 z_brl(no_reserved_zone_enabling);
2681
2682 // Enable reserved zone again, throw stack overflow exception.
2683 save_return_pc();
2684 push_frame_abi160(0);
2685 call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::enable_stack_reserved_zone), Z_thread);
2686 pop_frame();
2687 restore_return_pc();
2688
2689 load_const_optimized(Z_R1, StubRoutines::throw_delayed_StackOverflowError_entry());
2690 // Don't use call() or z_basr(), they will invalidate Z_R14 which contains the return pc.
2691 z_br(Z_R1);
2692
2693 should_not_reach_here();
2694
2695 bind(no_reserved_zone_enabling);
2696 BLOCK_COMMENT("} reserved_stack_check");
2697 }
2698
2699 // Defines obj, preserves var_size_in_bytes, okay for t2 == var_size_in_bytes.
2700 void MacroAssembler::tlab_allocate(Register obj,
2701 Register var_size_in_bytes,
2702 int con_size_in_bytes,
2703 Register t1,
2704 Label& slow_case) {
2705 assert_different_registers(obj, var_size_in_bytes, t1);
2706 Register end = t1;
2707 Register thread = Z_thread;
2708
2709 z_lg(obj, Address(thread, JavaThread::tlab_top_offset()));
2710 if (var_size_in_bytes == noreg) {
2711 z_lay(end, Address(obj, con_size_in_bytes));
2712 } else {
2713 z_lay(end, Address(obj, var_size_in_bytes));
2714 }
2715 z_cg(end, Address(thread, JavaThread::tlab_end_offset()));
2716 branch_optimized(bcondHigh, slow_case);
2717
2718 // Update the tlab top pointer.
2719 z_stg(end, Address(thread, JavaThread::tlab_top_offset()));
2720
2721 // Recover var_size_in_bytes if necessary.
2722 if (var_size_in_bytes == end) {
2723 z_sgr(var_size_in_bytes, obj);
2724 }
2725 }
2726
2727 // Emitter for interface method lookup.
2728 // input: recv_klass, intf_klass, itable_index
2729 // output: method_result
2730 // kills: itable_index, temp1_reg, Z_R0, Z_R1
2731 // TODO: Temp2_reg is unused. we may use this emitter also in the itable stubs.
2732 // If the register is still not needed then, remove it.
2733 void MacroAssembler::lookup_interface_method(Register recv_klass,
2734 Register intf_klass,
2735 RegisterOrConstant itable_index,
2736 Register method_result,
2737 Register temp1_reg,
2738 Label& no_such_interface,
2739 bool return_method) {
2740
2741 const Register vtable_len = temp1_reg; // Used to compute itable_entry_addr.
2742 const Register itable_entry_addr = Z_R1_scratch;
2743 const Register itable_interface = Z_R0_scratch;
2744
2745 BLOCK_COMMENT("lookup_interface_method {");
2746
2747 // Load start of itable entries into itable_entry_addr.
2748 z_llgf(vtable_len, Address(recv_klass, Klass::vtable_length_offset()));
2749 z_sllg(vtable_len, vtable_len, exact_log2(vtableEntry::size_in_bytes()));
2750
2751 // Loop over all itable entries until desired interfaceOop(Rinterface) found.
2752 const int vtable_base_offset = in_bytes(Klass::vtable_start_offset());
2753
2754 add2reg_with_index(itable_entry_addr,
2755 vtable_base_offset + itableOffsetEntry::interface_offset_in_bytes(),
2756 recv_klass, vtable_len);
2757
2758 const int itable_offset_search_inc = itableOffsetEntry::size() * wordSize;
2759 Label search;
2760
2761 bind(search);
2762
2763 // Handle IncompatibleClassChangeError.
2764 // If the entry is NULL then we've reached the end of the table
2765 // without finding the expected interface, so throw an exception.
2766 load_and_test_long(itable_interface, Address(itable_entry_addr));
2767 z_bre(no_such_interface);
2768
2769 add2reg(itable_entry_addr, itable_offset_search_inc);
2770 z_cgr(itable_interface, intf_klass);
2771 z_brne(search);
2772
2773 // Entry found and itable_entry_addr points to it, get offset of vtable for interface.
2774 if (return_method) {
2775 const int vtable_offset_offset = (itableOffsetEntry::offset_offset_in_bytes() -
2776 itableOffsetEntry::interface_offset_in_bytes()) -
2777 itable_offset_search_inc;
2778
2779 // Compute itableMethodEntry and get method and entry point
2780 // we use addressing with index and displacement, since the formula
2781 // for computing the entry's offset has a fixed and a dynamic part,
2782 // the latter depending on the matched interface entry and on the case,
2783 // that the itable index has been passed as a register, not a constant value.
2784 int method_offset = itableMethodEntry::method_offset_in_bytes();
2785 // Fixed part (displacement), common operand.
2786 Register itable_offset = method_result; // Dynamic part (index register).
2787
2788 if (itable_index.is_register()) {
2789 // Compute the method's offset in that register, for the formula, see the
2790 // else-clause below.
2791 z_sllg(itable_offset, itable_index.as_register(), exact_log2(itableMethodEntry::size() * wordSize));
2792 z_agf(itable_offset, vtable_offset_offset, itable_entry_addr);
2793 } else {
2794 // Displacement increases.
2795 method_offset += itableMethodEntry::size() * wordSize * itable_index.as_constant();
2796
2797 // Load index from itable.
2798 z_llgf(itable_offset, vtable_offset_offset, itable_entry_addr);
2799 }
2800
2801 // Finally load the method's oop.
2802 z_lg(method_result, method_offset, itable_offset, recv_klass);
2803 }
2804 BLOCK_COMMENT("} lookup_interface_method");
2805 }
2806
2807 // Lookup for virtual method invocation.
2808 void MacroAssembler::lookup_virtual_method(Register recv_klass,
2809 RegisterOrConstant vtable_index,
2810 Register method_result) {
2811 assert_different_registers(recv_klass, vtable_index.register_or_noreg());
2812 assert(vtableEntry::size() * wordSize == wordSize,
2813 "else adjust the scaling in the code below");
2814
2815 BLOCK_COMMENT("lookup_virtual_method {");
2816
2817 const int base = in_bytes(Klass::vtable_start_offset());
2818
2819 if (vtable_index.is_constant()) {
2820 // Load with base + disp.
2821 Address vtable_entry_addr(recv_klass,
2822 vtable_index.as_constant() * wordSize +
2823 base +
2824 vtableEntry::method_offset_in_bytes());
2825
2826 z_lg(method_result, vtable_entry_addr);
2827 } else {
2828 // Shift index properly and load with base + index + disp.
2829 Register vindex = vtable_index.as_register();
2830 Address vtable_entry_addr(recv_klass, vindex,
2831 base + vtableEntry::method_offset_in_bytes());
2832
2833 z_sllg(vindex, vindex, exact_log2(wordSize));
2834 z_lg(method_result, vtable_entry_addr);
2835 }
2836 BLOCK_COMMENT("} lookup_virtual_method");
2837 }
2838
2839 // Factor out code to call ic_miss_handler.
2840 // Generate code to call the inline cache miss handler.
2841 //
2842 // In most cases, this code will be generated out-of-line.
2843 // The method parameters are intended to provide some variability.
2844 // ICM - Label which has to be bound to the start of useful code (past any traps).
2845 // trapMarker - Marking byte for the generated illtrap instructions (if any).
2846 // Any value except 0x00 is supported.
2847 // = 0x00 - do not generate illtrap instructions.
2848 // use nops to fill unused space.
2849 // requiredSize - required size of the generated code. If the actually
2850 // generated code is smaller, use padding instructions to fill up.
2851 // = 0 - no size requirement, no padding.
2852 // scratch - scratch register to hold branch target address.
2853 //
2854 // The method returns the code offset of the bound label.
2855 unsigned int MacroAssembler::call_ic_miss_handler(Label& ICM, int trapMarker, int requiredSize, Register scratch) {
2856 intptr_t startOffset = offset();
2857
2858 // Prevent entry at content_begin().
2859 if (trapMarker != 0) {
2860 z_illtrap(trapMarker);
2861 }
2862
2863 // Load address of inline cache miss code into scratch register
2864 // and branch to cache miss handler.
2865 BLOCK_COMMENT("IC miss handler {");
2866 BIND(ICM);
2867 unsigned int labelOffset = offset();
2868 AddressLiteral icmiss(SharedRuntime::get_ic_miss_stub());
2869
2870 load_const_optimized(scratch, icmiss);
2871 z_br(scratch);
2872
2873 // Fill unused space.
2874 if (requiredSize > 0) {
2875 while ((offset() - startOffset) < requiredSize) {
2876 if (trapMarker == 0) {
2877 z_nop();
2878 } else {
2879 z_illtrap(trapMarker);
2880 }
2881 }
2882 }
2883 BLOCK_COMMENT("} IC miss handler");
2884 return labelOffset;
2885 }
2886
2887 void MacroAssembler::nmethod_UEP(Label& ic_miss) {
2888 Register ic_reg = Z_inline_cache;
2889 int klass_offset = oopDesc::klass_offset_in_bytes();
2890 if (!ImplicitNullChecks || MacroAssembler::needs_explicit_null_check(klass_offset)) {
2891 if (VM_Version::has_CompareBranch()) {
2892 z_cgij(Z_ARG1, 0, Assembler::bcondEqual, ic_miss);
2893 } else {
2894 z_ltgr(Z_ARG1, Z_ARG1);
2895 z_bre(ic_miss);
2896 }
2897 }
2898 // Compare cached class against klass from receiver.
2899 compare_klass_ptr(ic_reg, klass_offset, Z_ARG1, false);
2900 z_brne(ic_miss);
2901 }
2902
2903 void MacroAssembler::check_klass_subtype_fast_path(Register sub_klass,
2904 Register super_klass,
2905 Register temp1_reg,
2906 Label* L_success,
2907 Label* L_failure,
2908 Label* L_slow_path,
2909 RegisterOrConstant super_check_offset) {
2910
2911 const int sc_offset = in_bytes(Klass::secondary_super_cache_offset());
2912 const int sco_offset = in_bytes(Klass::super_check_offset_offset());
2913
2914 bool must_load_sco = (super_check_offset.constant_or_zero() == -1);
2915 bool need_slow_path = (must_load_sco ||
2916 super_check_offset.constant_or_zero() == sc_offset);
2917
2918 // Input registers must not overlap.
2919 assert_different_registers(sub_klass, super_klass, temp1_reg);
2920 if (super_check_offset.is_register()) {
2921 assert_different_registers(sub_klass, super_klass,
2922 super_check_offset.as_register());
2923 } else if (must_load_sco) {
2924 assert(temp1_reg != noreg, "supply either a temp or a register offset");
2925 }
2926
2927 const Register Rsuper_check_offset = temp1_reg;
2928
2929 NearLabel L_fallthrough;
2930 int label_nulls = 0;
2931 if (L_success == NULL) { L_success = &L_fallthrough; label_nulls++; }
2932 if (L_failure == NULL) { L_failure = &L_fallthrough; label_nulls++; }
2933 if (L_slow_path == NULL) { L_slow_path = &L_fallthrough; label_nulls++; }
2934 assert(label_nulls <= 1 ||
2935 (L_slow_path == &L_fallthrough && label_nulls <= 2 && !need_slow_path),
2936 "at most one NULL in the batch, usually");
2937
2938 BLOCK_COMMENT("check_klass_subtype_fast_path {");
2939 // If the pointers are equal, we are done (e.g., String[] elements).
2940 // This self-check enables sharing of secondary supertype arrays among
2941 // non-primary types such as array-of-interface. Otherwise, each such
2942 // type would need its own customized SSA.
2943 // We move this check to the front of the fast path because many
2944 // type checks are in fact trivially successful in this manner,
2945 // so we get a nicely predicted branch right at the start of the check.
2946 compare64_and_branch(sub_klass, super_klass, bcondEqual, *L_success);
2947
2948 // Check the supertype display, which is uint.
2949 if (must_load_sco) {
2950 z_llgf(Rsuper_check_offset, sco_offset, super_klass);
2951 super_check_offset = RegisterOrConstant(Rsuper_check_offset);
2952 }
2953 Address super_check_addr(sub_klass, super_check_offset, 0);
2954 z_cg(super_klass, super_check_addr); // compare w/ displayed supertype
2955
2956 // This check has worked decisively for primary supers.
2957 // Secondary supers are sought in the super_cache ('super_cache_addr').
2958 // (Secondary supers are interfaces and very deeply nested subtypes.)
2959 // This works in the same check above because of a tricky aliasing
2960 // between the super_cache and the primary super display elements.
2961 // (The 'super_check_addr' can address either, as the case requires.)
2962 // Note that the cache is updated below if it does not help us find
2963 // what we need immediately.
2964 // So if it was a primary super, we can just fail immediately.
2965 // Otherwise, it's the slow path for us (no success at this point).
2966
2967 // Hacked jmp, which may only be used just before L_fallthrough.
2968 #define final_jmp(label) \
2969 if (&(label) == &L_fallthrough) { /*do nothing*/ } \
2970 else { branch_optimized(Assembler::bcondAlways, label); } /*omit semicolon*/
2971
2972 if (super_check_offset.is_register()) {
2973 branch_optimized(Assembler::bcondEqual, *L_success);
2974 z_cfi(super_check_offset.as_register(), sc_offset);
2975 if (L_failure == &L_fallthrough) {
2976 branch_optimized(Assembler::bcondEqual, *L_slow_path);
2977 } else {
2978 branch_optimized(Assembler::bcondNotEqual, *L_failure);
2979 final_jmp(*L_slow_path);
2980 }
2981 } else if (super_check_offset.as_constant() == sc_offset) {
2982 // Need a slow path; fast failure is impossible.
2983 if (L_slow_path == &L_fallthrough) {
2984 branch_optimized(Assembler::bcondEqual, *L_success);
2985 } else {
2986 branch_optimized(Assembler::bcondNotEqual, *L_slow_path);
2987 final_jmp(*L_success);
2988 }
2989 } else {
2990 // No slow path; it's a fast decision.
2991 if (L_failure == &L_fallthrough) {
2992 branch_optimized(Assembler::bcondEqual, *L_success);
2993 } else {
2994 branch_optimized(Assembler::bcondNotEqual, *L_failure);
2995 final_jmp(*L_success);
2996 }
2997 }
2998
2999 bind(L_fallthrough);
3000 #undef local_brc
3001 #undef final_jmp
3002 BLOCK_COMMENT("} check_klass_subtype_fast_path");
3003 // fallthru (to slow path)
3004 }
3005
3006 void MacroAssembler::check_klass_subtype_slow_path(Register Rsubklass,
3007 Register Rsuperklass,
3008 Register Rarray_ptr, // tmp
3009 Register Rlength, // tmp
3010 Label* L_success,
3011 Label* L_failure) {
3012 // Input registers must not overlap.
3013 // Also check for R1 which is explicitly used here.
3014 assert_different_registers(Z_R1, Rsubklass, Rsuperklass, Rarray_ptr, Rlength);
3015 NearLabel L_fallthrough;
3016 int label_nulls = 0;
3017 if (L_success == NULL) { L_success = &L_fallthrough; label_nulls++; }
3018 if (L_failure == NULL) { L_failure = &L_fallthrough; label_nulls++; }
3019 assert(label_nulls <= 1, "at most one NULL in the batch");
3020
3021 const int ss_offset = in_bytes(Klass::secondary_supers_offset());
3022 const int sc_offset = in_bytes(Klass::secondary_super_cache_offset());
3023
3024 const int length_offset = Array<Klass*>::length_offset_in_bytes();
3025 const int base_offset = Array<Klass*>::base_offset_in_bytes();
3026
3027 // Hacked jmp, which may only be used just before L_fallthrough.
3028 #define final_jmp(label) \
3029 if (&(label) == &L_fallthrough) { /*do nothing*/ } \
3030 else branch_optimized(Assembler::bcondAlways, label) /*omit semicolon*/
3031
3032 NearLabel loop_iterate, loop_count, match;
3033
3034 BLOCK_COMMENT("check_klass_subtype_slow_path {");
3035 z_lg(Rarray_ptr, ss_offset, Rsubklass);
3036
3037 load_and_test_int(Rlength, Address(Rarray_ptr, length_offset));
3038 branch_optimized(Assembler::bcondZero, *L_failure);
3039
3040 // Oops in table are NO MORE compressed.
3041 z_cg(Rsuperklass, base_offset, Rarray_ptr); // Check array element for match.
3042 z_bre(match); // Shortcut for array length = 1.
3043
3044 // No match yet, so we must walk the array's elements.
3045 z_lngfr(Rlength, Rlength);
3046 z_sllg(Rlength, Rlength, LogBytesPerWord); // -#bytes of cache array
3047 z_llill(Z_R1, BytesPerWord); // Set increment/end index.
3048 add2reg(Rlength, 2 * BytesPerWord); // start index = -(n-2)*BytesPerWord
3049 z_slgr(Rarray_ptr, Rlength); // start addr: += (n-2)*BytesPerWord
3050 z_bru(loop_count);
3051
3052 BIND(loop_iterate);
3053 z_cg(Rsuperklass, base_offset, Rlength, Rarray_ptr); // Check array element for match.
3054 z_bre(match);
3055 BIND(loop_count);
3056 z_brxlg(Rlength, Z_R1, loop_iterate);
3057
3058 // Rsuperklass not found among secondary super classes -> failure.
3059 branch_optimized(Assembler::bcondAlways, *L_failure);
3060
3061 // Got a hit. Return success (zero result). Set cache.
3062 // Cache load doesn't happen here. For speed it is directly emitted by the compiler.
3063
3064 BIND(match);
3065
3066 z_stg(Rsuperklass, sc_offset, Rsubklass); // Save result to cache.
3067
3068 final_jmp(*L_success);
3069
3070 // Exit to the surrounding code.
3071 BIND(L_fallthrough);
3072 #undef local_brc
3073 #undef final_jmp
3074 BLOCK_COMMENT("} check_klass_subtype_slow_path");
3075 }
3076
3077 // Emitter for combining fast and slow path.
3078 void MacroAssembler::check_klass_subtype(Register sub_klass,
3079 Register super_klass,
3080 Register temp1_reg,
3081 Register temp2_reg,
3082 Label& L_success) {
3083 NearLabel failure;
3084 BLOCK_COMMENT(err_msg("check_klass_subtype(%s subclass of %s) {", sub_klass->name(), super_klass->name()));
3085 check_klass_subtype_fast_path(sub_klass, super_klass, temp1_reg,
3086 &L_success, &failure, NULL);
3087 check_klass_subtype_slow_path(sub_klass, super_klass,
3088 temp1_reg, temp2_reg, &L_success, NULL);
3089 BIND(failure);
3090 BLOCK_COMMENT("} check_klass_subtype");
3091 }
3092
3093 void MacroAssembler::clinit_barrier(Register klass, Register thread, Label* L_fast_path, Label* L_slow_path) {
3094 assert(L_fast_path != NULL || L_slow_path != NULL, "at least one is required");
3095
3096 Label L_fallthrough;
3097 if (L_fast_path == NULL) {
3098 L_fast_path = &L_fallthrough;
3099 } else if (L_slow_path == NULL) {
3100 L_slow_path = &L_fallthrough;
3101 }
3102
3103 // Fast path check: class is fully initialized
3104 z_cli(Address(klass, InstanceKlass::init_state_offset()), InstanceKlass::fully_initialized);
3105 z_bre(*L_fast_path);
3106
3107 // Fast path check: current thread is initializer thread
3108 z_cg(thread, Address(klass, InstanceKlass::init_thread_offset()));
3109 if (L_slow_path == &L_fallthrough) {
3110 z_bre(*L_fast_path);
3111 } else if (L_fast_path == &L_fallthrough) {
3112 z_brne(*L_slow_path);
3113 } else {
3114 Unimplemented();
3115 }
3116
3117 bind(L_fallthrough);
3118 }
3119
3120 // Increment a counter at counter_address when the eq condition code is
3121 // set. Kills registers tmp1_reg and tmp2_reg and preserves the condition code.
3122 void MacroAssembler::increment_counter_eq(address counter_address, Register tmp1_reg, Register tmp2_reg) {
3123 Label l;
3124 z_brne(l);
3125 load_const(tmp1_reg, counter_address);
3126 add2mem_32(Address(tmp1_reg), 1, tmp2_reg);
3127 z_cr(tmp1_reg, tmp1_reg); // Set cc to eq.
3128 bind(l);
3129 }
3130
3131 void MacroAssembler::compiler_fast_lock_object(Register oop, Register box, Register temp1, Register temp2) {
3132 Register displacedHeader = temp1;
3133 Register currentHeader = temp1;
3134 Register temp = temp2;
3135 NearLabel done, object_has_monitor;
3136
3137 BLOCK_COMMENT("compiler_fast_lock_object {");
3138
3139 // Load markWord from oop into mark.
3140 z_lg(displacedHeader, 0, oop);
3141
3142 if (DiagnoseSyncOnValueBasedClasses != 0) {
3143 load_klass(Z_R1_scratch, oop);
3144 z_l(Z_R1_scratch, Address(Z_R1_scratch, Klass::access_flags_offset()));
3145 assert((JVM_ACC_IS_VALUE_BASED_CLASS & 0xFFFF) == 0, "or change following instruction");
3146 z_nilh(Z_R1_scratch, JVM_ACC_IS_VALUE_BASED_CLASS >> 16);
3147 z_brne(done);
3148 }
3149
3150 // Handle existing monitor.
3151 // The object has an existing monitor iff (mark & monitor_value) != 0.
3152 guarantee(Immediate::is_uimm16(markWord::monitor_value), "must be half-word");
3153 z_lr(temp, displacedHeader);
3154 z_nill(temp, markWord::monitor_value);
3155 z_brne(object_has_monitor);
3156
3157 // Set mark to markWord | markWord::unlocked_value.
3158 z_oill(displacedHeader, markWord::unlocked_value);
3159
3160 // Load Compare Value application register.
3161
3162 // Initialize the box (must happen before we update the object mark).
3163 z_stg(displacedHeader, BasicLock::displaced_header_offset_in_bytes(), box);
3164
3165 // Memory Fence (in cmpxchgd)
3166 // Compare object markWord with mark and if equal exchange scratch1 with object markWord.
3167
3168 // If the compare-and-swap succeeded, then we found an unlocked object and we
3169 // have now locked it.
3170 z_csg(displacedHeader, box, 0, oop);
3171 assert(currentHeader==displacedHeader, "must be same register"); // Identified two registers from z/Architecture.
3172 z_bre(done);
3173
3174 // We did not see an unlocked object so try the fast recursive case.
3175
3176 z_sgr(currentHeader, Z_SP);
3177 load_const_optimized(temp, (~(os::vm_page_size()-1) | markWord::lock_mask_in_place));
3178
3179 z_ngr(currentHeader, temp);
3180 // z_brne(done);
3181 // z_release();
3182 z_stg(currentHeader/*==0 or not 0*/, BasicLock::displaced_header_offset_in_bytes(), box);
3183
3184 z_bru(done);
3185
3186 Register zero = temp;
3187 Register monitor_tagged = displacedHeader; // Tagged with markWord::monitor_value.
3188 bind(object_has_monitor);
3189 // The object's monitor m is unlocked iff m->owner == NULL,
3190 // otherwise m->owner may contain a thread or a stack address.
3191 //
3192 // Try to CAS m->owner from NULL to current thread.
3193 z_lghi(zero, 0);
3194 // If m->owner is null, then csg succeeds and sets m->owner=THREAD and CR=EQ.
3195 z_csg(zero, Z_thread, OM_OFFSET_NO_MONITOR_VALUE_TAG(owner), monitor_tagged);
3196 // Store a non-null value into the box.
3197 z_stg(box, BasicLock::displaced_header_offset_in_bytes(), box);
3198 #ifdef ASSERT
3199 z_brne(done);
3200 // We've acquired the monitor, check some invariants.
3201 // Invariant 1: _recursions should be 0.
3202 asm_assert_mem8_is_zero(OM_OFFSET_NO_MONITOR_VALUE_TAG(recursions), monitor_tagged,
3203 "monitor->_recursions should be 0", -1);
3204 z_ltgr(zero, zero); // Set CR=EQ.
3205 #endif
3206 bind(done);
3207
3208 BLOCK_COMMENT("} compiler_fast_lock_object");
3209 // If locking was successful, CR should indicate 'EQ'.
3210 // The compiler or the native wrapper generates a branch to the runtime call
3211 // _complete_monitor_locking_Java.
3212 }
3213
3214 void MacroAssembler::compiler_fast_unlock_object(Register oop, Register box, Register temp1, Register temp2) {
3215 Register displacedHeader = temp1;
3216 Register currentHeader = temp2;
3217 Register temp = temp1;
3218 Register monitor = temp2;
3219
3220 Label done, object_has_monitor;
3221
3222 BLOCK_COMMENT("compiler_fast_unlock_object {");
3223
3224 // Find the lock address and load the displaced header from the stack.
3225 // if the displaced header is zero, we have a recursive unlock.
3226 load_and_test_long(displacedHeader, Address(box, BasicLock::displaced_header_offset_in_bytes()));
3227 z_bre(done);
3228
3229 // Handle existing monitor.
3230 // The object has an existing monitor iff (mark & monitor_value) != 0.
3231 z_lg(currentHeader, oopDesc::mark_offset_in_bytes(), oop);
3232 guarantee(Immediate::is_uimm16(markWord::monitor_value), "must be half-word");
3233 z_nill(currentHeader, markWord::monitor_value);
3234 z_brne(object_has_monitor);
3235
3236 // Check if it is still a light weight lock, this is true if we see
3237 // the stack address of the basicLock in the markWord of the object
3238 // copy box to currentHeader such that csg does not kill it.
3239 z_lgr(currentHeader, box);
3240 z_csg(currentHeader, displacedHeader, 0, oop);
3241 z_bru(done); // Csg sets CR as desired.
3242
3243 // Handle existing monitor.
3244 bind(object_has_monitor);
3245 z_lg(currentHeader, oopDesc::mark_offset_in_bytes(), oop); // CurrentHeader is tagged with monitor_value set.
3246 load_and_test_long(temp, Address(currentHeader, OM_OFFSET_NO_MONITOR_VALUE_TAG(recursions)));
3247 z_brne(done);
3248 load_and_test_long(temp, Address(currentHeader, OM_OFFSET_NO_MONITOR_VALUE_TAG(owner)));
3249 z_brne(done);
3250 load_and_test_long(temp, Address(currentHeader, OM_OFFSET_NO_MONITOR_VALUE_TAG(EntryList)));
3251 z_brne(done);
3252 load_and_test_long(temp, Address(currentHeader, OM_OFFSET_NO_MONITOR_VALUE_TAG(cxq)));
3253 z_brne(done);
3254 z_release();
3255 z_stg(temp/*=0*/, OM_OFFSET_NO_MONITOR_VALUE_TAG(owner), currentHeader);
3256
3257 bind(done);
3258
3259 BLOCK_COMMENT("} compiler_fast_unlock_object");
3260 // flag == EQ indicates success
3261 // flag == NE indicates failure
3262 }
3263
3264 void MacroAssembler::resolve_jobject(Register value, Register tmp1, Register tmp2) {
3265 BarrierSetAssembler* bs = BarrierSet::barrier_set()->barrier_set_assembler();
3266 bs->resolve_jobject(this, value, tmp1, tmp2);
3267 }
3268
3269 // Last_Java_sp must comply to the rules in frame_s390.hpp.
3270 void MacroAssembler::set_last_Java_frame(Register last_Java_sp, Register last_Java_pc, bool allow_relocation) {
3271 BLOCK_COMMENT("set_last_Java_frame {");
3272
3273 // Always set last_Java_pc and flags first because once last_Java_sp
3274 // is visible has_last_Java_frame is true and users will look at the
3275 // rest of the fields. (Note: flags should always be zero before we
3276 // get here so doesn't need to be set.)
3277
3278 // Verify that last_Java_pc was zeroed on return to Java.
3279 if (allow_relocation) {
3280 asm_assert_mem8_is_zero(in_bytes(JavaThread::last_Java_pc_offset()),
3281 Z_thread,
3282 "last_Java_pc not zeroed before leaving Java",
3283 0x200);
3284 } else {
3285 asm_assert_mem8_is_zero_static(in_bytes(JavaThread::last_Java_pc_offset()),
3286 Z_thread,
3287 "last_Java_pc not zeroed before leaving Java",
3288 0x200);
3289 }
3290
3291 // When returning from calling out from Java mode the frame anchor's
3292 // last_Java_pc will always be set to NULL. It is set here so that
3293 // if we are doing a call to native (not VM) that we capture the
3294 // known pc and don't have to rely on the native call having a
3295 // standard frame linkage where we can find the pc.
3296 if (last_Java_pc!=noreg) {
3297 z_stg(last_Java_pc, Address(Z_thread, JavaThread::last_Java_pc_offset()));
3298 }
3299
3300 // This membar release is not required on z/Architecture, since the sequence of stores
3301 // in maintained. Nevertheless, we leave it in to document the required ordering.
3302 // The implementation of z_release() should be empty.
3303 // z_release();
3304
3305 z_stg(last_Java_sp, Address(Z_thread, JavaThread::last_Java_sp_offset()));
3306 BLOCK_COMMENT("} set_last_Java_frame");
3307 }
3308
3309 void MacroAssembler::reset_last_Java_frame(bool allow_relocation) {
3310 BLOCK_COMMENT("reset_last_Java_frame {");
3311
3312 if (allow_relocation) {
3313 asm_assert_mem8_isnot_zero(in_bytes(JavaThread::last_Java_sp_offset()),
3314 Z_thread,
3315 "SP was not set, still zero",
3316 0x202);
3317 } else {
3318 asm_assert_mem8_isnot_zero_static(in_bytes(JavaThread::last_Java_sp_offset()),
3319 Z_thread,
3320 "SP was not set, still zero",
3321 0x202);
3322 }
3323
3324 // _last_Java_sp = 0
3325 // Clearing storage must be atomic here, so don't use clear_mem()!
3326 store_const(Address(Z_thread, JavaThread::last_Java_sp_offset()), 0);
3327
3328 // _last_Java_pc = 0
3329 store_const(Address(Z_thread, JavaThread::last_Java_pc_offset()), 0);
3330
3331 BLOCK_COMMENT("} reset_last_Java_frame");
3332 return;
3333 }
3334
3335 void MacroAssembler::set_top_ijava_frame_at_SP_as_last_Java_frame(Register sp, Register tmp1, bool allow_relocation) {
3336 assert_different_registers(sp, tmp1);
3337
3338 // We cannot trust that code generated by the C++ compiler saves R14
3339 // to z_abi_160.return_pc, because sometimes it spills R14 using stmg at
3340 // z_abi_160.gpr14 (e.g. InterpreterRuntime::_new()).
3341 // Therefore we load the PC into tmp1 and let set_last_Java_frame() save
3342 // it into the frame anchor.
3343 get_PC(tmp1);
3344 set_last_Java_frame(/*sp=*/sp, /*pc=*/tmp1, allow_relocation);
3345 }
3346
3347 void MacroAssembler::set_thread_state(JavaThreadState new_state) {
3348 z_release();
3349
3350 assert(Immediate::is_uimm16(_thread_max_state), "enum value out of range for instruction");
3351 assert(sizeof(JavaThreadState) == sizeof(int), "enum value must have base type int");
3352 store_const(Address(Z_thread, JavaThread::thread_state_offset()), new_state, Z_R0, false);
3353 }
3354
3355 void MacroAssembler::get_vm_result(Register oop_result) {
3356 verify_thread();
3357
3358 z_lg(oop_result, Address(Z_thread, JavaThread::vm_result_offset()));
3359 clear_mem(Address(Z_thread, JavaThread::vm_result_offset()), sizeof(void*));
3360
3361 verify_oop(oop_result, FILE_AND_LINE);
3362 }
3363
3364 void MacroAssembler::get_vm_result_2(Register result) {
3365 verify_thread();
3366
3367 z_lg(result, Address(Z_thread, JavaThread::vm_result_2_offset()));
3368 clear_mem(Address(Z_thread, JavaThread::vm_result_2_offset()), sizeof(void*));
3369 }
3370
3371 // We require that C code which does not return a value in vm_result will
3372 // leave it undisturbed.
3373 void MacroAssembler::set_vm_result(Register oop_result) {
3374 z_stg(oop_result, Address(Z_thread, JavaThread::vm_result_offset()));
3375 }
3376
3377 // Explicit null checks (used for method handle code).
3378 void MacroAssembler::null_check(Register reg, Register tmp, int64_t offset) {
3379 if (!ImplicitNullChecks) {
3380 NearLabel ok;
3381
3382 compare64_and_branch(reg, (intptr_t) 0, Assembler::bcondNotEqual, ok);
3383
3384 // We just put the address into reg if it was 0 (tmp==Z_R0 is allowed so we can't use it for the address).
3385 address exception_entry = Interpreter::throw_NullPointerException_entry();
3386 load_absolute_address(reg, exception_entry);
3387 z_br(reg);
3388
3389 bind(ok);
3390 } else {
3391 if (needs_explicit_null_check((intptr_t)offset)) {
3392 // Provoke OS NULL exception if reg = NULL by
3393 // accessing M[reg] w/o changing any registers.
3394 z_lg(tmp, 0, reg);
3395 }
3396 // else
3397 // Nothing to do, (later) access of M[reg + offset]
3398 // will provoke OS NULL exception if reg = NULL.
3399 }
3400 }
3401
3402 //-------------------------------------
3403 // Compressed Klass Pointers
3404 //-------------------------------------
3405
3406 // Klass oop manipulations if compressed.
3407 void MacroAssembler::encode_klass_not_null(Register dst, Register src) {
3408 Register current = (src != noreg) ? src : dst; // Klass is in dst if no src provided. (dst == src) also possible.
3409 address base = CompressedKlassPointers::base();
3410 int shift = CompressedKlassPointers::shift();
3411 bool need_zero_extend = base != 0;
3412 assert(UseCompressedClassPointers, "only for compressed klass ptrs");
3413
3414 BLOCK_COMMENT("cKlass encoder {");
3415
3416 #ifdef ASSERT
3417 Label ok;
3418 z_tmll(current, KlassAlignmentInBytes-1); // Check alignment.
3419 z_brc(Assembler::bcondAllZero, ok);
3420 // The plain disassembler does not recognize illtrap. It instead displays
3421 // a 32-bit value. Issuing two illtraps assures the disassembler finds
3422 // the proper beginning of the next instruction.
3423 z_illtrap(0xee);
3424 z_illtrap(0xee);
3425 bind(ok);
3426 #endif
3427
3428 // Scale down the incoming klass pointer first.
3429 // We then can be sure we calculate an offset that fits into 32 bit.
3430 // More generally speaking: all subsequent calculations are purely 32-bit.
3431 if (shift != 0) {
3432 assert (LogKlassAlignmentInBytes == shift, "decode alg wrong");
3433 z_srlg(dst, current, shift);
3434 current = dst;
3435 }
3436
3437 if (base != NULL) {
3438 // Use scaled-down base address parts to match scaled-down klass pointer.
3439 unsigned int base_h = ((unsigned long)base)>>(32+shift);
3440 unsigned int base_l = (unsigned int)(((unsigned long)base)>>shift);
3441
3442 // General considerations:
3443 // - when calculating (current_h - base_h), all digits must cancel (become 0).
3444 // Otherwise, we would end up with a compressed klass pointer which doesn't
3445 // fit into 32-bit.
3446 // - Only bit#33 of the difference could potentially be non-zero. For that
3447 // to happen, (current_l < base_l) must hold. In this case, the subtraction
3448 // will create a borrow out of bit#32, nicely killing bit#33.
3449 // - With the above, we only need to consider current_l and base_l to
3450 // calculate the result.
3451 // - Both values are treated as unsigned. The unsigned subtraction is
3452 // replaced by adding (unsigned) the 2's complement of the subtrahend.
3453
3454 if (base_l == 0) {
3455 // - By theory, the calculation to be performed here (current_h - base_h) MUST
3456 // cancel all high-word bits. Otherwise, we would end up with an offset
3457 // (i.e. compressed klass pointer) that does not fit into 32 bit.
3458 // - current_l remains unchanged.
3459 // - Therefore, we can replace all calculation with just a
3460 // zero-extending load 32 to 64 bit.
3461 // - Even that can be replaced with a conditional load if dst != current.
3462 // (this is a local view. The shift step may have requested zero-extension).
3463 } else {
3464 if ((base_h == 0) && is_uimm(base_l, 31)) {
3465 // If we happen to find that (base_h == 0), and that base_l is within the range
3466 // which can be represented by a signed int, then we can use 64bit signed add with
3467 // (-base_l) as 32bit signed immediate operand. The add will take care of the
3468 // upper 32 bits of the result, saving us the need of an extra zero extension.
3469 // For base_l to be in the required range, it must not have the most significant
3470 // bit (aka sign bit) set.
3471 lgr_if_needed(dst, current); // no zero/sign extension in this case!
3472 z_agfi(dst, -(int)base_l); // base_l must be passed as signed.
3473 need_zero_extend = false;
3474 current = dst;
3475 } else {
3476 // To begin with, we may need to copy and/or zero-extend the register operand.
3477 // We have to calculate (current_l - base_l). Because there is no unsigend
3478 // subtract instruction with immediate operand, we add the 2's complement of base_l.
3479 if (need_zero_extend) {
3480 z_llgfr(dst, current);
3481 need_zero_extend = false;
3482 } else {
3483 llgfr_if_needed(dst, current);
3484 }
3485 current = dst;
3486 z_alfi(dst, -base_l);
3487 }
3488 }
3489 }
3490
3491 if (need_zero_extend) {
3492 // We must zero-extend the calculated result. It may have some leftover bits in
3493 // the hi-word because we only did optimized calculations.
3494 z_llgfr(dst, current);
3495 } else {
3496 llgfr_if_needed(dst, current); // zero-extension while copying comes at no extra cost.
3497 }
3498
3499 BLOCK_COMMENT("} cKlass encoder");
3500 }
3501
3502 // This function calculates the size of the code generated by
3503 // decode_klass_not_null(register dst, Register src)
3504 // when (Universe::heap() != NULL). Hence, if the instructions
3505 // it generates change, then this method needs to be updated.
3506 int MacroAssembler::instr_size_for_decode_klass_not_null() {
3507 address base = CompressedKlassPointers::base();
3508 int shift_size = CompressedKlassPointers::shift() == 0 ? 0 : 6; /* sllg */
3509 int addbase_size = 0;
3510 assert(UseCompressedClassPointers, "only for compressed klass ptrs");
3511
3512 if (base != NULL) {
3513 unsigned int base_h = ((unsigned long)base)>>32;
3514 unsigned int base_l = (unsigned int)((unsigned long)base);
3515 if ((base_h != 0) && (base_l == 0) && VM_Version::has_HighWordInstr()) {
3516 addbase_size += 6; /* aih */
3517 } else if ((base_h == 0) && (base_l != 0)) {
3518 addbase_size += 6; /* algfi */
3519 } else {
3520 addbase_size += load_const_size();
3521 addbase_size += 4; /* algr */
3522 }
3523 }
3524 #ifdef ASSERT
3525 addbase_size += 10;
3526 addbase_size += 2; // Extra sigill.
3527 #endif
3528 return addbase_size + shift_size;
3529 }
3530
3531 // !!! If the instructions that get generated here change
3532 // then function instr_size_for_decode_klass_not_null()
3533 // needs to get updated.
3534 // This variant of decode_klass_not_null() must generate predictable code!
3535 // The code must only depend on globally known parameters.
3536 void MacroAssembler::decode_klass_not_null(Register dst) {
3537 address base = CompressedKlassPointers::base();
3538 int shift = CompressedKlassPointers::shift();
3539 int beg_off = offset();
3540 assert(UseCompressedClassPointers, "only for compressed klass ptrs");
3541
3542 BLOCK_COMMENT("cKlass decoder (const size) {");
3543
3544 if (shift != 0) { // Shift required?
3545 z_sllg(dst, dst, shift);
3546 }
3547 if (base != NULL) {
3548 unsigned int base_h = ((unsigned long)base)>>32;
3549 unsigned int base_l = (unsigned int)((unsigned long)base);
3550 if ((base_h != 0) && (base_l == 0) && VM_Version::has_HighWordInstr()) {
3551 z_aih(dst, base_h); // Base has no set bits in lower half.
3552 } else if ((base_h == 0) && (base_l != 0)) {
3553 z_algfi(dst, base_l); // Base has no set bits in upper half.
3554 } else {
3555 load_const(Z_R0, base); // Base has set bits everywhere.
3556 z_algr(dst, Z_R0);
3557 }
3558 }
3559
3560 #ifdef ASSERT
3561 Label ok;
3562 z_tmll(dst, KlassAlignmentInBytes-1); // Check alignment.
3563 z_brc(Assembler::bcondAllZero, ok);
3564 // The plain disassembler does not recognize illtrap. It instead displays
3565 // a 32-bit value. Issuing two illtraps assures the disassembler finds
3566 // the proper beginning of the next instruction.
3567 z_illtrap(0xd1);
3568 z_illtrap(0xd1);
3569 bind(ok);
3570 #endif
3571 assert(offset() == beg_off + instr_size_for_decode_klass_not_null(), "Code gen mismatch.");
3572
3573 BLOCK_COMMENT("} cKlass decoder (const size)");
3574 }
3575
3576 // This variant of decode_klass_not_null() is for cases where
3577 // 1) the size of the generated instructions may vary
3578 // 2) the result is (potentially) stored in a register different from the source.
3579 void MacroAssembler::decode_klass_not_null(Register dst, Register src) {
3580 address base = CompressedKlassPointers::base();
3581 int shift = CompressedKlassPointers::shift();
3582 assert(UseCompressedClassPointers, "only for compressed klass ptrs");
3583
3584 BLOCK_COMMENT("cKlass decoder {");
3585
3586 if (src == noreg) src = dst;
3587
3588 if (shift != 0) { // Shift or at least move required?
3589 z_sllg(dst, src, shift);
3590 } else {
3591 lgr_if_needed(dst, src);
3592 }
3593
3594 if (base != NULL) {
3595 unsigned int base_h = ((unsigned long)base)>>32;
3596 unsigned int base_l = (unsigned int)((unsigned long)base);
3597 if ((base_h != 0) && (base_l == 0) && VM_Version::has_HighWordInstr()) {
3598 z_aih(dst, base_h); // Base has not set bits in lower half.
3599 } else if ((base_h == 0) && (base_l != 0)) {
3600 z_algfi(dst, base_l); // Base has no set bits in upper half.
3601 } else {
3602 load_const_optimized(Z_R0, base); // Base has set bits everywhere.
3603 z_algr(dst, Z_R0);
3604 }
3605 }
3606
3607 #ifdef ASSERT
3608 Label ok;
3609 z_tmll(dst, KlassAlignmentInBytes-1); // Check alignment.
3610 z_brc(Assembler::bcondAllZero, ok);
3611 // The plain disassembler does not recognize illtrap. It instead displays
3612 // a 32-bit value. Issuing two illtraps assures the disassembler finds
3613 // the proper beginning of the next instruction.
3614 z_illtrap(0xd2);
3615 z_illtrap(0xd2);
3616 bind(ok);
3617 #endif
3618 BLOCK_COMMENT("} cKlass decoder");
3619 }
3620
3621 void MacroAssembler::load_klass(Register klass, Address mem) {
3622 if (UseCompressedClassPointers) {
3623 z_llgf(klass, mem);
3624 // Attention: no null check here!
3625 decode_klass_not_null(klass);
3626 } else {
3627 z_lg(klass, mem);
3628 }
3629 }
3630
3631 void MacroAssembler::load_klass(Register klass, Register src_oop) {
3632 if (UseCompressedClassPointers) {
3633 z_llgf(klass, oopDesc::klass_offset_in_bytes(), src_oop);
3634 // Attention: no null check here!
3635 decode_klass_not_null(klass);
3636 } else {
3637 z_lg(klass, oopDesc::klass_offset_in_bytes(), src_oop);
3638 }
3639 }
3640
3641 void MacroAssembler::store_klass(Register klass, Register dst_oop, Register ck) {
3642 if (UseCompressedClassPointers) {
3643 assert_different_registers(dst_oop, klass, Z_R0);
3644 if (ck == noreg) ck = klass;
3645 encode_klass_not_null(ck, klass);
3646 z_st(ck, Address(dst_oop, oopDesc::klass_offset_in_bytes()));
3647 } else {
3648 z_stg(klass, Address(dst_oop, oopDesc::klass_offset_in_bytes()));
3649 }
3650 }
3651
3652 void MacroAssembler::store_klass_gap(Register s, Register d) {
3653 if (UseCompressedClassPointers) {
3654 assert(s != d, "not enough registers");
3655 // Support s = noreg.
3656 if (s != noreg) {
3657 z_st(s, Address(d, oopDesc::klass_gap_offset_in_bytes()));
3658 } else {
3659 z_mvhi(Address(d, oopDesc::klass_gap_offset_in_bytes()), 0);
3660 }
3661 }
3662 }
3663
3664 // Compare klass ptr in memory against klass ptr in register.
3665 //
3666 // Rop1 - klass in register, always uncompressed.
3667 // disp - Offset of klass in memory, compressed/uncompressed, depending on runtime flag.
3668 // Rbase - Base address of cKlass in memory.
3669 // maybeNULL - True if Rop1 possibly is a NULL.
3670 void MacroAssembler::compare_klass_ptr(Register Rop1, int64_t disp, Register Rbase, bool maybeNULL) {
3671
3672 BLOCK_COMMENT("compare klass ptr {");
3673
3674 if (UseCompressedClassPointers) {
3675 const int shift = CompressedKlassPointers::shift();
3676 address base = CompressedKlassPointers::base();
3677
3678 assert((shift == 0) || (shift == LogKlassAlignmentInBytes), "cKlass encoder detected bad shift");
3679 assert_different_registers(Rop1, Z_R0);
3680 assert_different_registers(Rop1, Rbase, Z_R1);
3681
3682 // First encode register oop and then compare with cOop in memory.
3683 // This sequence saves an unnecessary cOop load and decode.
3684 if (base == NULL) {
3685 if (shift == 0) {
3686 z_cl(Rop1, disp, Rbase); // Unscaled
3687 } else {
3688 z_srlg(Z_R0, Rop1, shift); // ZeroBased
3689 z_cl(Z_R0, disp, Rbase);
3690 }
3691 } else { // HeapBased
3692 #ifdef ASSERT
3693 bool used_R0 = true;
3694 bool used_R1 = true;
3695 #endif
3696 Register current = Rop1;
3697 Label done;
3698
3699 if (maybeNULL) { // NULL ptr must be preserved!
3700 z_ltgr(Z_R0, current);
3701 z_bre(done);
3702 current = Z_R0;
3703 }
3704
3705 unsigned int base_h = ((unsigned long)base)>>32;
3706 unsigned int base_l = (unsigned int)((unsigned long)base);
3707 if ((base_h != 0) && (base_l == 0) && VM_Version::has_HighWordInstr()) {
3708 lgr_if_needed(Z_R0, current);
3709 z_aih(Z_R0, -((int)base_h)); // Base has no set bits in lower half.
3710 } else if ((base_h == 0) && (base_l != 0)) {
3711 lgr_if_needed(Z_R0, current);
3712 z_agfi(Z_R0, -(int)base_l);
3713 } else {
3714 int pow2_offset = get_oop_base_complement(Z_R1, ((uint64_t)(intptr_t)base));
3715 add2reg_with_index(Z_R0, pow2_offset, Z_R1, Rop1); // Subtract base by adding complement.
3716 }
3717
3718 if (shift != 0) {
3719 z_srlg(Z_R0, Z_R0, shift);
3720 }
3721 bind(done);
3722 z_cl(Z_R0, disp, Rbase);
3723 #ifdef ASSERT
3724 if (used_R0) preset_reg(Z_R0, 0xb05bUL, 2);
3725 if (used_R1) preset_reg(Z_R1, 0xb06bUL, 2);
3726 #endif
3727 }
3728 } else {
3729 z_clg(Rop1, disp, Z_R0, Rbase);
3730 }
3731 BLOCK_COMMENT("} compare klass ptr");
3732 }
3733
3734 //---------------------------
3735 // Compressed oops
3736 //---------------------------
3737
3738 void MacroAssembler::encode_heap_oop(Register oop) {
3739 oop_encoder(oop, oop, true /*maybe null*/);
3740 }
3741
3742 void MacroAssembler::encode_heap_oop_not_null(Register oop) {
3743 oop_encoder(oop, oop, false /*not null*/);
3744 }
3745
3746 // Called with something derived from the oop base. e.g. oop_base>>3.
3747 int MacroAssembler::get_oop_base_pow2_offset(uint64_t oop_base) {
3748 unsigned int oop_base_ll = ((unsigned int)(oop_base >> 0)) & 0xffff;
3749 unsigned int oop_base_lh = ((unsigned int)(oop_base >> 16)) & 0xffff;
3750 unsigned int oop_base_hl = ((unsigned int)(oop_base >> 32)) & 0xffff;
3751 unsigned int oop_base_hh = ((unsigned int)(oop_base >> 48)) & 0xffff;
3752 unsigned int n_notzero_parts = (oop_base_ll == 0 ? 0:1)
3753 + (oop_base_lh == 0 ? 0:1)
3754 + (oop_base_hl == 0 ? 0:1)
3755 + (oop_base_hh == 0 ? 0:1);
3756
3757 assert(oop_base != 0, "This is for HeapBased cOops only");
3758
3759 if (n_notzero_parts != 1) { // Check if oop_base is just a few pages shy of a power of 2.
3760 uint64_t pow2_offset = 0x10000 - oop_base_ll;
3761 if (pow2_offset < 0x8000) { // This might not be necessary.
3762 uint64_t oop_base2 = oop_base + pow2_offset;
3763
3764 oop_base_ll = ((unsigned int)(oop_base2 >> 0)) & 0xffff;
3765 oop_base_lh = ((unsigned int)(oop_base2 >> 16)) & 0xffff;
3766 oop_base_hl = ((unsigned int)(oop_base2 >> 32)) & 0xffff;
3767 oop_base_hh = ((unsigned int)(oop_base2 >> 48)) & 0xffff;
3768 n_notzero_parts = (oop_base_ll == 0 ? 0:1) +
3769 (oop_base_lh == 0 ? 0:1) +
3770 (oop_base_hl == 0 ? 0:1) +
3771 (oop_base_hh == 0 ? 0:1);
3772 if (n_notzero_parts == 1) {
3773 assert(-(int64_t)pow2_offset != (int64_t)-1, "We use -1 to signal uninitialized base register");
3774 return -pow2_offset;
3775 }
3776 }
3777 }
3778 return 0;
3779 }
3780
3781 // If base address is offset from a straight power of two by just a few pages,
3782 // return this offset to the caller for a possible later composite add.
3783 // TODO/FIX: will only work correctly for 4k pages.
3784 int MacroAssembler::get_oop_base(Register Rbase, uint64_t oop_base) {
3785 int pow2_offset = get_oop_base_pow2_offset(oop_base);
3786
3787 load_const_optimized(Rbase, oop_base - pow2_offset); // Best job possible.
3788
3789 return pow2_offset;
3790 }
3791
3792 int MacroAssembler::get_oop_base_complement(Register Rbase, uint64_t oop_base) {
3793 int offset = get_oop_base(Rbase, oop_base);
3794 z_lcgr(Rbase, Rbase);
3795 return -offset;
3796 }
3797
3798 // Compare compressed oop in memory against oop in register.
3799 // Rop1 - Oop in register.
3800 // disp - Offset of cOop in memory.
3801 // Rbase - Base address of cOop in memory.
3802 // maybeNULL - True if Rop1 possibly is a NULL.
3803 // maybeNULLtarget - Branch target for Rop1 == NULL, if flow control shall NOT continue with compare instruction.
3804 void MacroAssembler::compare_heap_oop(Register Rop1, Address mem, bool maybeNULL) {
3805 Register Rbase = mem.baseOrR0();
3806 Register Rindex = mem.indexOrR0();
3807 int64_t disp = mem.disp();
3808
3809 const int shift = CompressedOops::shift();
3810 address base = CompressedOops::base();
3811
3812 assert(UseCompressedOops, "must be on to call this method");
3813 assert(Universe::heap() != NULL, "java heap must be initialized to call this method");
3814 assert((shift == 0) || (shift == LogMinObjAlignmentInBytes), "cOop encoder detected bad shift");
3815 assert_different_registers(Rop1, Z_R0);
3816 assert_different_registers(Rop1, Rbase, Z_R1);
3817 assert_different_registers(Rop1, Rindex, Z_R1);
3818
3819 BLOCK_COMMENT("compare heap oop {");
3820
3821 // First encode register oop and then compare with cOop in memory.
3822 // This sequence saves an unnecessary cOop load and decode.
3823 if (base == NULL) {
3824 if (shift == 0) {
3825 z_cl(Rop1, disp, Rindex, Rbase); // Unscaled
3826 } else {
3827 z_srlg(Z_R0, Rop1, shift); // ZeroBased
3828 z_cl(Z_R0, disp, Rindex, Rbase);
3829 }
3830 } else { // HeapBased
3831 #ifdef ASSERT
3832 bool used_R0 = true;
3833 bool used_R1 = true;
3834 #endif
3835 Label done;
3836 int pow2_offset = get_oop_base_complement(Z_R1, ((uint64_t)(intptr_t)base));
3837
3838 if (maybeNULL) { // NULL ptr must be preserved!
3839 z_ltgr(Z_R0, Rop1);
3840 z_bre(done);
3841 }
3842
3843 add2reg_with_index(Z_R0, pow2_offset, Z_R1, Rop1);
3844 z_srlg(Z_R0, Z_R0, shift);
3845
3846 bind(done);
3847 z_cl(Z_R0, disp, Rindex, Rbase);
3848 #ifdef ASSERT
3849 if (used_R0) preset_reg(Z_R0, 0xb05bUL, 2);
3850 if (used_R1) preset_reg(Z_R1, 0xb06bUL, 2);
3851 #endif
3852 }
3853 BLOCK_COMMENT("} compare heap oop");
3854 }
3855
3856 void MacroAssembler::access_store_at(BasicType type, DecoratorSet decorators,
3857 const Address& addr, Register val,
3858 Register tmp1, Register tmp2, Register tmp3) {
3859 assert((decorators & ~(AS_RAW | IN_HEAP | IN_NATIVE | IS_ARRAY | IS_NOT_NULL |
3860 ON_UNKNOWN_OOP_REF)) == 0, "unsupported decorator");
3861 BarrierSetAssembler* bs = BarrierSet::barrier_set()->barrier_set_assembler();
3862 decorators = AccessInternal::decorator_fixup(decorators);
3863 bool as_raw = (decorators & AS_RAW) != 0;
3864 if (as_raw) {
3865 bs->BarrierSetAssembler::store_at(this, decorators, type,
3866 addr, val,
3867 tmp1, tmp2, tmp3);
3868 } else {
3869 bs->store_at(this, decorators, type,
3870 addr, val,
3871 tmp1, tmp2, tmp3);
3872 }
3873 }
3874
3875 void MacroAssembler::access_load_at(BasicType type, DecoratorSet decorators,
3876 const Address& addr, Register dst,
3877 Register tmp1, Register tmp2, Label *is_null) {
3878 assert((decorators & ~(AS_RAW | IN_HEAP | IN_NATIVE | IS_ARRAY | IS_NOT_NULL |
3879 ON_PHANTOM_OOP_REF | ON_WEAK_OOP_REF)) == 0, "unsupported decorator");
3880 BarrierSetAssembler* bs = BarrierSet::barrier_set()->barrier_set_assembler();
3881 decorators = AccessInternal::decorator_fixup(decorators);
3882 bool as_raw = (decorators & AS_RAW) != 0;
3883 if (as_raw) {
3884 bs->BarrierSetAssembler::load_at(this, decorators, type,
3885 addr, dst,
3886 tmp1, tmp2, is_null);
3887 } else {
3888 bs->load_at(this, decorators, type,
3889 addr, dst,
3890 tmp1, tmp2, is_null);
3891 }
3892 }
3893
3894 void MacroAssembler::load_heap_oop(Register dest, const Address &a,
3895 Register tmp1, Register tmp2,
3896 DecoratorSet decorators, Label *is_null) {
3897 access_load_at(T_OBJECT, IN_HEAP | decorators, a, dest, tmp1, tmp2, is_null);
3898 }
3899
3900 void MacroAssembler::store_heap_oop(Register Roop, const Address &a,
3901 Register tmp1, Register tmp2, Register tmp3,
3902 DecoratorSet decorators) {
3903 access_store_at(T_OBJECT, IN_HEAP | decorators, a, Roop, tmp1, tmp2, tmp3);
3904 }
3905
3906 //-------------------------------------------------
3907 // Encode compressed oop. Generally usable encoder.
3908 //-------------------------------------------------
3909 // Rsrc - contains regular oop on entry. It remains unchanged.
3910 // Rdst - contains compressed oop on exit.
3911 // Rdst and Rsrc may indicate same register, in which case Rsrc does not remain unchanged.
3912 //
3913 // Rdst must not indicate scratch register Z_R1 (Z_R1_scratch) for functionality.
3914 // Rdst should not indicate scratch register Z_R0 (Z_R0_scratch) for performance.
3915 //
3916 // only32bitValid is set, if later code only uses the lower 32 bits. In this
3917 // case we must not fix the upper 32 bits.
3918 void MacroAssembler::oop_encoder(Register Rdst, Register Rsrc, bool maybeNULL,
3919 Register Rbase, int pow2_offset, bool only32bitValid) {
3920
3921 const address oop_base = CompressedOops::base();
3922 const int oop_shift = CompressedOops::shift();
3923 const bool disjoint = CompressedOops::base_disjoint();
3924
3925 assert(UseCompressedOops, "must be on to call this method");
3926 assert(Universe::heap() != NULL, "java heap must be initialized to call this encoder");
3927 assert((oop_shift == 0) || (oop_shift == LogMinObjAlignmentInBytes), "cOop encoder detected bad shift");
3928
3929 if (disjoint || (oop_base == NULL)) {
3930 BLOCK_COMMENT("cOop encoder zeroBase {");
3931 if (oop_shift == 0) {
3932 if (oop_base != NULL && !only32bitValid) {
3933 z_llgfr(Rdst, Rsrc); // Clear upper bits in case the register will be decoded again.
3934 } else {
3935 lgr_if_needed(Rdst, Rsrc);
3936 }
3937 } else {
3938 z_srlg(Rdst, Rsrc, oop_shift);
3939 if (oop_base != NULL && !only32bitValid) {
3940 z_llgfr(Rdst, Rdst); // Clear upper bits in case the register will be decoded again.
3941 }
3942 }
3943 BLOCK_COMMENT("} cOop encoder zeroBase");
3944 return;
3945 }
3946
3947 bool used_R0 = false;
3948 bool used_R1 = false;
3949
3950 BLOCK_COMMENT("cOop encoder general {");
3951 assert_different_registers(Rdst, Z_R1);
3952 assert_different_registers(Rsrc, Rbase);
3953 if (maybeNULL) {
3954 Label done;
3955 // We reorder shifting and subtracting, so that we can compare
3956 // and shift in parallel:
3957 //
3958 // cycle 0: potential LoadN, base = <const>
3959 // cycle 1: base = !base dst = src >> 3, cmp cr = (src != 0)
3960 // cycle 2: if (cr) br, dst = dst + base + offset
3961
3962 // Get oop_base components.
3963 if (pow2_offset == -1) {
3964 if (Rdst == Rbase) {
3965 if (Rdst == Z_R1 || Rsrc == Z_R1) {
3966 Rbase = Z_R0;
3967 used_R0 = true;
3968 } else {
3969 Rdst = Z_R1;
3970 used_R1 = true;
3971 }
3972 }
3973 if (Rbase == Z_R1) {
3974 used_R1 = true;
3975 }
3976 pow2_offset = get_oop_base_complement(Rbase, ((uint64_t)(intptr_t)oop_base) >> oop_shift);
3977 }
3978 assert_different_registers(Rdst, Rbase);
3979
3980 // Check for NULL oop (must be left alone) and shift.
3981 if (oop_shift != 0) { // Shift out alignment bits
3982 if (((intptr_t)oop_base&0xc000000000000000L) == 0L) { // We are sure: no single address will have the leftmost bit set.
3983 z_srag(Rdst, Rsrc, oop_shift); // Arithmetic shift sets the condition code.
3984 } else {
3985 z_srlg(Rdst, Rsrc, oop_shift);
3986 z_ltgr(Rsrc, Rsrc); // This is the recommended way of testing for zero.
3987 // This probably is faster, as it does not write a register. No!
3988 // z_cghi(Rsrc, 0);
3989 }
3990 } else {
3991 z_ltgr(Rdst, Rsrc); // Move NULL to result register.
3992 }
3993 z_bre(done);
3994
3995 // Subtract oop_base components.
3996 if ((Rdst == Z_R0) || (Rbase == Z_R0)) {
3997 z_algr(Rdst, Rbase);
3998 if (pow2_offset != 0) { add2reg(Rdst, pow2_offset); }
3999 } else {
4000 add2reg_with_index(Rdst, pow2_offset, Rbase, Rdst);
4001 }
4002 if (!only32bitValid) {
4003 z_llgfr(Rdst, Rdst); // Clear upper bits in case the register will be decoded again.
4004 }
4005 bind(done);
4006
4007 } else { // not null
4008 // Get oop_base components.
4009 if (pow2_offset == -1) {
4010 pow2_offset = get_oop_base_complement(Rbase, (uint64_t)(intptr_t)oop_base);
4011 }
4012
4013 // Subtract oop_base components and shift.
4014 if (Rdst == Z_R0 || Rsrc == Z_R0 || Rbase == Z_R0) {
4015 // Don't use lay instruction.
4016 if (Rdst == Rsrc) {
4017 z_algr(Rdst, Rbase);
4018 } else {
4019 lgr_if_needed(Rdst, Rbase);
4020 z_algr(Rdst, Rsrc);
4021 }
4022 if (pow2_offset != 0) add2reg(Rdst, pow2_offset);
4023 } else {
4024 add2reg_with_index(Rdst, pow2_offset, Rbase, Rsrc);
4025 }
4026 if (oop_shift != 0) { // Shift out alignment bits.
4027 z_srlg(Rdst, Rdst, oop_shift);
4028 }
4029 if (!only32bitValid) {
4030 z_llgfr(Rdst, Rdst); // Clear upper bits in case the register will be decoded again.
4031 }
4032 }
4033 #ifdef ASSERT
4034 if (used_R0 && Rdst != Z_R0 && Rsrc != Z_R0) { preset_reg(Z_R0, 0xb01bUL, 2); }
4035 if (used_R1 && Rdst != Z_R1 && Rsrc != Z_R1) { preset_reg(Z_R1, 0xb02bUL, 2); }
4036 #endif
4037 BLOCK_COMMENT("} cOop encoder general");
4038 }
4039
4040 //-------------------------------------------------
4041 // decode compressed oop. Generally usable decoder.
4042 //-------------------------------------------------
4043 // Rsrc - contains compressed oop on entry.
4044 // Rdst - contains regular oop on exit.
4045 // Rdst and Rsrc may indicate same register.
4046 // Rdst must not be the same register as Rbase, if Rbase was preloaded (before call).
4047 // Rdst can be the same register as Rbase. Then, either Z_R0 or Z_R1 must be available as scratch.
4048 // Rbase - register to use for the base
4049 // pow2_offset - offset of base to nice value. If -1, base must be loaded.
4050 // For performance, it is good to
4051 // - avoid Z_R0 for any of the argument registers.
4052 // - keep Rdst and Rsrc distinct from Rbase. Rdst == Rsrc is ok for performance.
4053 // - avoid Z_R1 for Rdst if Rdst == Rbase.
4054 void MacroAssembler::oop_decoder(Register Rdst, Register Rsrc, bool maybeNULL, Register Rbase, int pow2_offset) {
4055
4056 const address oop_base = CompressedOops::base();
4057 const int oop_shift = CompressedOops::shift();
4058 const bool disjoint = CompressedOops::base_disjoint();
4059
4060 assert(UseCompressedOops, "must be on to call this method");
4061 assert(Universe::heap() != NULL, "java heap must be initialized to call this decoder");
4062 assert((oop_shift == 0) || (oop_shift == LogMinObjAlignmentInBytes),
4063 "cOop encoder detected bad shift");
4064
4065 // cOops are always loaded zero-extended from memory. No explicit zero-extension necessary.
4066
4067 if (oop_base != NULL) {
4068 unsigned int oop_base_hl = ((unsigned int)((uint64_t)(intptr_t)oop_base >> 32)) & 0xffff;
4069 unsigned int oop_base_hh = ((unsigned int)((uint64_t)(intptr_t)oop_base >> 48)) & 0xffff;
4070 unsigned int oop_base_hf = ((unsigned int)((uint64_t)(intptr_t)oop_base >> 32)) & 0xFFFFffff;
4071 if (disjoint && (oop_base_hl == 0 || oop_base_hh == 0)) {
4072 BLOCK_COMMENT("cOop decoder disjointBase {");
4073 // We do not need to load the base. Instead, we can install the upper bits
4074 // with an OR instead of an ADD.
4075 Label done;
4076
4077 // Rsrc contains a narrow oop. Thus we are sure the leftmost <oop_shift> bits will never be set.
4078 if (maybeNULL) { // NULL ptr must be preserved!
4079 z_slag(Rdst, Rsrc, oop_shift); // Arithmetic shift sets the condition code.
4080 z_bre(done);
4081 } else {
4082 z_sllg(Rdst, Rsrc, oop_shift); // Logical shift leaves condition code alone.
4083 }
4084 if ((oop_base_hl != 0) && (oop_base_hh != 0)) {
4085 z_oihf(Rdst, oop_base_hf);
4086 } else if (oop_base_hl != 0) {
4087 z_oihl(Rdst, oop_base_hl);
4088 } else {
4089 assert(oop_base_hh != 0, "not heapbased mode");
4090 z_oihh(Rdst, oop_base_hh);
4091 }
4092 bind(done);
4093 BLOCK_COMMENT("} cOop decoder disjointBase");
4094 } else {
4095 BLOCK_COMMENT("cOop decoder general {");
4096 // There are three decode steps:
4097 // scale oop offset (shift left)
4098 // get base (in reg) and pow2_offset (constant)
4099 // add base, pow2_offset, and oop offset
4100 // The following register overlap situations may exist:
4101 // Rdst == Rsrc, Rbase any other
4102 // not a problem. Scaling in-place leaves Rbase undisturbed.
4103 // Loading Rbase does not impact the scaled offset.
4104 // Rdst == Rbase, Rsrc any other
4105 // scaling would destroy a possibly preloaded Rbase. Loading Rbase
4106 // would destroy the scaled offset.
4107 // Remedy: use Rdst_tmp if Rbase has been preloaded.
4108 // use Rbase_tmp if base has to be loaded.
4109 // Rsrc == Rbase, Rdst any other
4110 // Only possible without preloaded Rbase.
4111 // Loading Rbase does not destroy compressed oop because it was scaled into Rdst before.
4112 // Rsrc == Rbase, Rdst == Rbase
4113 // Only possible without preloaded Rbase.
4114 // Loading Rbase would destroy compressed oop. Scaling in-place is ok.
4115 // Remedy: use Rbase_tmp.
4116 //
4117 Label done;
4118 Register Rdst_tmp = Rdst;
4119 Register Rbase_tmp = Rbase;
4120 bool used_R0 = false;
4121 bool used_R1 = false;
4122 bool base_preloaded = pow2_offset >= 0;
4123 guarantee(!(base_preloaded && (Rsrc == Rbase)), "Register clash, check caller");
4124 assert(oop_shift != 0, "room for optimization");
4125
4126 // Check if we need to use scratch registers.
4127 if (Rdst == Rbase) {
4128 assert(!(((Rdst == Z_R0) && (Rsrc == Z_R1)) || ((Rdst == Z_R1) && (Rsrc == Z_R0))), "need a scratch reg");
4129 if (Rdst != Rsrc) {
4130 if (base_preloaded) { Rdst_tmp = (Rdst == Z_R1) ? Z_R0 : Z_R1; }
4131 else { Rbase_tmp = (Rdst == Z_R1) ? Z_R0 : Z_R1; }
4132 } else {
4133 Rbase_tmp = (Rdst == Z_R1) ? Z_R0 : Z_R1;
4134 }
4135 }
4136 if (base_preloaded) lgr_if_needed(Rbase_tmp, Rbase);
4137
4138 // Scale oop and check for NULL.
4139 // Rsrc contains a narrow oop. Thus we are sure the leftmost <oop_shift> bits will never be set.
4140 if (maybeNULL) { // NULL ptr must be preserved!
4141 z_slag(Rdst_tmp, Rsrc, oop_shift); // Arithmetic shift sets the condition code.
4142 z_bre(done);
4143 } else {
4144 z_sllg(Rdst_tmp, Rsrc, oop_shift); // Logical shift leaves condition code alone.
4145 }
4146
4147 // Get oop_base components.
4148 if (!base_preloaded) {
4149 pow2_offset = get_oop_base(Rbase_tmp, (uint64_t)(intptr_t)oop_base);
4150 }
4151
4152 // Add up all components.
4153 if ((Rbase_tmp == Z_R0) || (Rdst_tmp == Z_R0)) {
4154 z_algr(Rdst_tmp, Rbase_tmp);
4155 if (pow2_offset != 0) { add2reg(Rdst_tmp, pow2_offset); }
4156 } else {
4157 add2reg_with_index(Rdst_tmp, pow2_offset, Rbase_tmp, Rdst_tmp);
4158 }
4159
4160 bind(done);
4161 lgr_if_needed(Rdst, Rdst_tmp);
4162 #ifdef ASSERT
4163 if (used_R0 && Rdst != Z_R0 && Rsrc != Z_R0) { preset_reg(Z_R0, 0xb03bUL, 2); }
4164 if (used_R1 && Rdst != Z_R1 && Rsrc != Z_R1) { preset_reg(Z_R1, 0xb04bUL, 2); }
4165 #endif
4166 BLOCK_COMMENT("} cOop decoder general");
4167 }
4168 } else {
4169 BLOCK_COMMENT("cOop decoder zeroBase {");
4170 if (oop_shift == 0) {
4171 lgr_if_needed(Rdst, Rsrc);
4172 } else {
4173 z_sllg(Rdst, Rsrc, oop_shift);
4174 }
4175 BLOCK_COMMENT("} cOop decoder zeroBase");
4176 }
4177 }
4178
4179 // ((OopHandle)result).resolve();
4180 void MacroAssembler::resolve_oop_handle(Register result) {
4181 // OopHandle::resolve is an indirection.
4182 z_lg(result, 0, result);
4183 }
4184
4185 void MacroAssembler::load_mirror_from_const_method(Register mirror, Register const_method) {
4186 mem2reg_opt(mirror, Address(const_method, ConstMethod::constants_offset()));
4187 mem2reg_opt(mirror, Address(mirror, ConstantPool::pool_holder_offset_in_bytes()));
4188 mem2reg_opt(mirror, Address(mirror, Klass::java_mirror_offset()));
4189 resolve_oop_handle(mirror);
4190 }
4191
4192 void MacroAssembler::load_method_holder(Register holder, Register method) {
4193 mem2reg_opt(holder, Address(method, Method::const_offset()));
4194 mem2reg_opt(holder, Address(holder, ConstMethod::constants_offset()));
4195 mem2reg_opt(holder, Address(holder, ConstantPool::pool_holder_offset_in_bytes()));
4196 }
4197
4198 //---------------------------------------------------------------
4199 //--- Operations on arrays.
4200 //---------------------------------------------------------------
4201
4202 // Compiler ensures base is doubleword aligned and cnt is #doublewords.
4203 // Emitter does not KILL cnt and base arguments, since they need to be copied to
4204 // work registers anyway.
4205 // Actually, only r0, r1, and r5 are killed.
4206 unsigned int MacroAssembler::Clear_Array(Register cnt_arg, Register base_pointer_arg, Register odd_tmp_reg) {
4207
4208 int block_start = offset();
4209 Register dst_len = Z_R1; // Holds dst len for MVCLE.
4210 Register dst_addr = Z_R0; // Holds dst addr for MVCLE.
4211
4212 Label doXC, doMVCLE, done;
4213
4214 BLOCK_COMMENT("Clear_Array {");
4215
4216 // Check for zero len and convert to long.
4217 z_ltgfr(odd_tmp_reg, cnt_arg);
4218 z_bre(done); // Nothing to do if len == 0.
4219
4220 // Prefetch data to be cleared.
4221 if (VM_Version::has_Prefetch()) {
4222 z_pfd(0x02, 0, Z_R0, base_pointer_arg);
4223 z_pfd(0x02, 256, Z_R0, base_pointer_arg);
4224 }
4225
4226 z_sllg(dst_len, odd_tmp_reg, 3); // #bytes to clear.
4227 z_cghi(odd_tmp_reg, 32); // Check for len <= 256 bytes (<=32 DW).
4228 z_brnh(doXC); // If so, use executed XC to clear.
4229
4230 // MVCLE: initialize long arrays (general case).
4231 bind(doMVCLE);
4232 z_lgr(dst_addr, base_pointer_arg);
4233 // Pass 0 as source length to MVCLE: destination will be filled with padding byte 0.
4234 // The even register of the register pair is not killed.
4235 clear_reg(odd_tmp_reg, true, false);
4236 MacroAssembler::move_long_ext(dst_addr, as_Register(odd_tmp_reg->encoding()-1), 0);
4237 z_bru(done);
4238
4239 // XC: initialize short arrays.
4240 Label XC_template; // Instr template, never exec directly!
4241 bind(XC_template);
4242 z_xc(0,0,base_pointer_arg,0,base_pointer_arg);
4243
4244 bind(doXC);
4245 add2reg(dst_len, -1); // Get #bytes-1 for EXECUTE.
4246 if (VM_Version::has_ExecuteExtensions()) {
4247 z_exrl(dst_len, XC_template); // Execute XC with var. len.
4248 } else {
4249 z_larl(odd_tmp_reg, XC_template);
4250 z_ex(dst_len,0,Z_R0,odd_tmp_reg); // Execute XC with var. len.
4251 }
4252 // z_bru(done); // fallthru
4253
4254 bind(done);
4255
4256 BLOCK_COMMENT("} Clear_Array");
4257
4258 int block_end = offset();
4259 return block_end - block_start;
4260 }
4261
4262 // Compiler ensures base is doubleword aligned and cnt is count of doublewords.
4263 // Emitter does not KILL any arguments nor work registers.
4264 // Emitter generates up to 16 XC instructions, depending on the array length.
4265 unsigned int MacroAssembler::Clear_Array_Const(long cnt, Register base) {
4266 int block_start = offset();
4267 int off;
4268 int lineSize_Bytes = AllocatePrefetchStepSize;
4269 int lineSize_DW = AllocatePrefetchStepSize>>LogBytesPerWord;
4270 bool doPrefetch = VM_Version::has_Prefetch();
4271 int XC_maxlen = 256;
4272 int numXCInstr = cnt > 0 ? (cnt*BytesPerWord-1)/XC_maxlen+1 : 0;
4273
4274 BLOCK_COMMENT("Clear_Array_Const {");
4275 assert(cnt*BytesPerWord <= 4096, "ClearArrayConst can handle 4k only");
4276
4277 // Do less prefetching for very short arrays.
4278 if (numXCInstr > 0) {
4279 // Prefetch only some cache lines, then begin clearing.
4280 if (doPrefetch) {
4281 if (cnt*BytesPerWord <= lineSize_Bytes/4) { // If less than 1/4 of a cache line to clear,
4282 z_pfd(0x02, 0, Z_R0, base); // prefetch just the first cache line.
4283 } else {
4284 assert(XC_maxlen == lineSize_Bytes, "ClearArrayConst needs 256B cache lines");
4285 for (off = 0; (off < AllocatePrefetchLines) && (off <= numXCInstr); off ++) {
4286 z_pfd(0x02, off*lineSize_Bytes, Z_R0, base);
4287 }
4288 }
4289 }
4290
4291 for (off=0; off<(numXCInstr-1); off++) {
4292 z_xc(off*XC_maxlen, XC_maxlen-1, base, off*XC_maxlen, base);
4293
4294 // Prefetch some cache lines in advance.
4295 if (doPrefetch && (off <= numXCInstr-AllocatePrefetchLines)) {
4296 z_pfd(0x02, (off+AllocatePrefetchLines)*lineSize_Bytes, Z_R0, base);
4297 }
4298 }
4299 if (off*XC_maxlen < cnt*BytesPerWord) {
4300 z_xc(off*XC_maxlen, (cnt*BytesPerWord-off*XC_maxlen)-1, base, off*XC_maxlen, base);
4301 }
4302 }
4303 BLOCK_COMMENT("} Clear_Array_Const");
4304
4305 int block_end = offset();
4306 return block_end - block_start;
4307 }
4308
4309 // Compiler ensures base is doubleword aligned and cnt is #doublewords.
4310 // Emitter does not KILL cnt and base arguments, since they need to be copied to
4311 // work registers anyway.
4312 // Actually, only r0, r1, (which are work registers) and odd_tmp_reg are killed.
4313 //
4314 // For very large arrays, exploit MVCLE H/W support.
4315 // MVCLE instruction automatically exploits H/W-optimized page mover.
4316 // - Bytes up to next page boundary are cleared with a series of XC to self.
4317 // - All full pages are cleared with the page mover H/W assist.
4318 // - Remaining bytes are again cleared by a series of XC to self.
4319 //
4320 unsigned int MacroAssembler::Clear_Array_Const_Big(long cnt, Register base_pointer_arg, Register odd_tmp_reg) {
4321
4322 int block_start = offset();
4323 Register dst_len = Z_R1; // Holds dst len for MVCLE.
4324 Register dst_addr = Z_R0; // Holds dst addr for MVCLE.
4325
4326 BLOCK_COMMENT("Clear_Array_Const_Big {");
4327
4328 // Get len to clear.
4329 load_const_optimized(dst_len, (long)cnt*8L); // in Bytes = #DW*8
4330
4331 // Prepare other args to MVCLE.
4332 z_lgr(dst_addr, base_pointer_arg);
4333 // Pass 0 as source length to MVCLE: destination will be filled with padding byte 0.
4334 // The even register of the register pair is not killed.
4335 (void) clear_reg(odd_tmp_reg, true, false); // Src len of MVCLE is zero.
4336 MacroAssembler::move_long_ext(dst_addr, as_Register(odd_tmp_reg->encoding() - 1), 0);
4337 BLOCK_COMMENT("} Clear_Array_Const_Big");
4338
4339 int block_end = offset();
4340 return block_end - block_start;
4341 }
4342
4343 // Allocator.
4344 unsigned int MacroAssembler::CopyRawMemory_AlignedDisjoint(Register src_reg, Register dst_reg,
4345 Register cnt_reg,
4346 Register tmp1_reg, Register tmp2_reg) {
4347 // Tmp1 is oddReg.
4348 // Tmp2 is evenReg.
4349
4350 int block_start = offset();
4351 Label doMVC, doMVCLE, done, MVC_template;
4352
4353 BLOCK_COMMENT("CopyRawMemory_AlignedDisjoint {");
4354
4355 // Check for zero len and convert to long.
4356 z_ltgfr(cnt_reg, cnt_reg); // Remember casted value for doSTG case.
4357 z_bre(done); // Nothing to do if len == 0.
4358
4359 z_sllg(Z_R1, cnt_reg, 3); // Dst len in bytes. calc early to have the result ready.
4360
4361 z_cghi(cnt_reg, 32); // Check for len <= 256 bytes (<=32 DW).
4362 z_brnh(doMVC); // If so, use executed MVC to clear.
4363
4364 bind(doMVCLE); // A lot of data (more than 256 bytes).
4365 // Prep dest reg pair.
4366 z_lgr(Z_R0, dst_reg); // dst addr
4367 // Dst len already in Z_R1.
4368 // Prep src reg pair.
4369 z_lgr(tmp2_reg, src_reg); // src addr
4370 z_lgr(tmp1_reg, Z_R1); // Src len same as dst len.
4371
4372 // Do the copy.
4373 move_long_ext(Z_R0, tmp2_reg, 0xb0); // Bypass cache.
4374 z_bru(done); // All done.
4375
4376 bind(MVC_template); // Just some data (not more than 256 bytes).
4377 z_mvc(0, 0, dst_reg, 0, src_reg);
4378
4379 bind(doMVC);
4380
4381 if (VM_Version::has_ExecuteExtensions()) {
4382 add2reg(Z_R1, -1);
4383 } else {
4384 add2reg(tmp1_reg, -1, Z_R1);
4385 z_larl(Z_R1, MVC_template);
4386 }
4387
4388 if (VM_Version::has_Prefetch()) {
4389 z_pfd(1, 0,Z_R0,src_reg);
4390 z_pfd(2, 0,Z_R0,dst_reg);
4391 // z_pfd(1,256,Z_R0,src_reg); // Assume very short copy.
4392 // z_pfd(2,256,Z_R0,dst_reg);
4393 }
4394
4395 if (VM_Version::has_ExecuteExtensions()) {
4396 z_exrl(Z_R1, MVC_template);
4397 } else {
4398 z_ex(tmp1_reg, 0, Z_R0, Z_R1);
4399 }
4400
4401 bind(done);
4402
4403 BLOCK_COMMENT("} CopyRawMemory_AlignedDisjoint");
4404
4405 int block_end = offset();
4406 return block_end - block_start;
4407 }
4408
4409 //-------------------------------------------------
4410 // Constants (scalar and oop) in constant pool
4411 //-------------------------------------------------
4412
4413 // Add a non-relocated constant to the CP.
4414 int MacroAssembler::store_const_in_toc(AddressLiteral& val) {
4415 long value = val.value();
4416 address tocPos = long_constant(value);
4417
4418 if (tocPos != NULL) {
4419 int tocOffset = (int)(tocPos - code()->consts()->start());
4420 return tocOffset;
4421 }
4422 // Address_constant returned NULL, so no constant entry has been created.
4423 // In that case, we return a "fatal" offset, just in case that subsequently
4424 // generated access code is executed.
4425 return -1;
4426 }
4427
4428 // Returns the TOC offset where the address is stored.
4429 // Add a relocated constant to the CP.
4430 int MacroAssembler::store_oop_in_toc(AddressLiteral& oop) {
4431 // Use RelocationHolder::none for the constant pool entry.
4432 // Otherwise we will end up with a failing NativeCall::verify(x),
4433 // where x is the address of the constant pool entry.
4434 address tocPos = address_constant((address)oop.value(), RelocationHolder::none);
4435
4436 if (tocPos != NULL) {
4437 int tocOffset = (int)(tocPos - code()->consts()->start());
4438 RelocationHolder rsp = oop.rspec();
4439 Relocation *rel = rsp.reloc();
4440
4441 // Store toc_offset in relocation, used by call_far_patchable.
4442 if ((relocInfo::relocType)rel->type() == relocInfo::runtime_call_w_cp_type) {
4443 ((runtime_call_w_cp_Relocation *)(rel))->set_constant_pool_offset(tocOffset);
4444 }
4445 // Relocate at the load's pc.
4446 relocate(rsp);
4447
4448 return tocOffset;
4449 }
4450 // Address_constant returned NULL, so no constant entry has been created
4451 // in that case, we return a "fatal" offset, just in case that subsequently
4452 // generated access code is executed.
4453 return -1;
4454 }
4455
4456 bool MacroAssembler::load_const_from_toc(Register dst, AddressLiteral& a, Register Rtoc) {
4457 int tocOffset = store_const_in_toc(a);
4458 if (tocOffset == -1) return false;
4459 address tocPos = tocOffset + code()->consts()->start();
4460 assert((address)code()->consts()->start() != NULL, "Please add CP address");
4461 relocate(a.rspec());
4462 load_long_pcrelative(dst, tocPos);
4463 return true;
4464 }
4465
4466 bool MacroAssembler::load_oop_from_toc(Register dst, AddressLiteral& a, Register Rtoc) {
4467 int tocOffset = store_oop_in_toc(a);
4468 if (tocOffset == -1) return false;
4469 address tocPos = tocOffset + code()->consts()->start();
4470 assert((address)code()->consts()->start() != NULL, "Please add CP address");
4471
4472 load_addr_pcrelative(dst, tocPos);
4473 return true;
4474 }
4475
4476 // If the instruction sequence at the given pc is a load_const_from_toc
4477 // sequence, return the value currently stored at the referenced position
4478 // in the TOC.
4479 intptr_t MacroAssembler::get_const_from_toc(address pc) {
4480
4481 assert(is_load_const_from_toc(pc), "must be load_const_from_pool");
4482
4483 long offset = get_load_const_from_toc_offset(pc);
4484 address dataLoc = NULL;
4485 if (is_load_const_from_toc_pcrelative(pc)) {
4486 dataLoc = pc + offset;
4487 } else {
4488 CodeBlob* cb = CodeCache::find_blob_unsafe(pc); // Else we get assertion if nmethod is zombie.
4489 assert(cb && cb->is_nmethod(), "sanity");
4490 nmethod* nm = (nmethod*)cb;
4491 dataLoc = nm->ctable_begin() + offset;
4492 }
4493 return *(intptr_t *)dataLoc;
4494 }
4495
4496 // If the instruction sequence at the given pc is a load_const_from_toc
4497 // sequence, copy the passed-in new_data value into the referenced
4498 // position in the TOC.
4499 void MacroAssembler::set_const_in_toc(address pc, unsigned long new_data, CodeBlob *cb) {
4500 assert(is_load_const_from_toc(pc), "must be load_const_from_pool");
4501
4502 long offset = MacroAssembler::get_load_const_from_toc_offset(pc);
4503 address dataLoc = NULL;
4504 if (is_load_const_from_toc_pcrelative(pc)) {
4505 dataLoc = pc+offset;
4506 } else {
4507 nmethod* nm = CodeCache::find_nmethod(pc);
4508 assert((cb == NULL) || (nm == (nmethod*)cb), "instruction address should be in CodeBlob");
4509 dataLoc = nm->ctable_begin() + offset;
4510 }
4511 if (*(unsigned long *)dataLoc != new_data) { // Prevent cache invalidation: update only if necessary.
4512 *(unsigned long *)dataLoc = new_data;
4513 }
4514 }
4515
4516 // Dynamic TOC. Getter must only be called if "a" is a load_const_from_toc
4517 // site. Verify by calling is_load_const_from_toc() before!!
4518 // Offset is +/- 2**32 -> use long.
4519 long MacroAssembler::get_load_const_from_toc_offset(address a) {
4520 assert(is_load_const_from_toc_pcrelative(a), "expected pc relative load");
4521 // expected code sequence:
4522 // z_lgrl(t, simm32); len = 6
4523 unsigned long inst;
4524 unsigned int len = get_instruction(a, &inst);
4525 return get_pcrel_offset(inst);
4526 }
4527
4528 //**********************************************************************************
4529 // inspection of generated instruction sequences for a particular pattern
4530 //**********************************************************************************
4531
4532 bool MacroAssembler::is_load_const_from_toc_pcrelative(address a) {
4533 #ifdef ASSERT
4534 unsigned long inst;
4535 unsigned int len = get_instruction(a+2, &inst);
4536 if ((len == 6) && is_load_pcrelative_long(a) && is_call_pcrelative_long(inst)) {
4537 const int range = 128;
4538 Assembler::dump_code_range(tty, a, range, "instr(a) == z_lgrl && instr(a+2) == z_brasl");
4539 VM_Version::z_SIGSEGV();
4540 }
4541 #endif
4542 // expected code sequence:
4543 // z_lgrl(t, relAddr32); len = 6
4544 //TODO: verify accessed data is in CP, if possible.
4545 return is_load_pcrelative_long(a); // TODO: might be too general. Currently, only lgrl is used.
4546 }
4547
4548 bool MacroAssembler::is_load_const_from_toc_call(address a) {
4549 return is_load_const_from_toc(a) && is_call_byregister(a + load_const_from_toc_size());
4550 }
4551
4552 bool MacroAssembler::is_load_const_call(address a) {
4553 return is_load_const(a) && is_call_byregister(a + load_const_size());
4554 }
4555
4556 //-------------------------------------------------
4557 // Emitters for some really CICS instructions
4558 //-------------------------------------------------
4559
4560 void MacroAssembler::move_long_ext(Register dst, Register src, unsigned int pad) {
4561 assert(dst->encoding()%2==0, "must be an even/odd register pair");
4562 assert(src->encoding()%2==0, "must be an even/odd register pair");
4563 assert(pad<256, "must be a padding BYTE");
4564
4565 Label retry;
4566 bind(retry);
4567 Assembler::z_mvcle(dst, src, pad);
4568 Assembler::z_brc(Assembler::bcondOverflow /* CC==3 (iterate) */, retry);
4569 }
4570
4571 void MacroAssembler::compare_long_ext(Register left, Register right, unsigned int pad) {
4572 assert(left->encoding() % 2 == 0, "must be an even/odd register pair");
4573 assert(right->encoding() % 2 == 0, "must be an even/odd register pair");
4574 assert(pad<256, "must be a padding BYTE");
4575
4576 Label retry;
4577 bind(retry);
4578 Assembler::z_clcle(left, right, pad, Z_R0);
4579 Assembler::z_brc(Assembler::bcondOverflow /* CC==3 (iterate) */, retry);
4580 }
4581
4582 void MacroAssembler::compare_long_uni(Register left, Register right, unsigned int pad) {
4583 assert(left->encoding() % 2 == 0, "must be an even/odd register pair");
4584 assert(right->encoding() % 2 == 0, "must be an even/odd register pair");
4585 assert(pad<=0xfff, "must be a padding HALFWORD");
4586 assert(VM_Version::has_ETF2(), "instruction must be available");
4587
4588 Label retry;
4589 bind(retry);
4590 Assembler::z_clclu(left, right, pad, Z_R0);
4591 Assembler::z_brc(Assembler::bcondOverflow /* CC==3 (iterate) */, retry);
4592 }
4593
4594 void MacroAssembler::search_string(Register end, Register start) {
4595 assert(end->encoding() != 0, "end address must not be in R0");
4596 assert(start->encoding() != 0, "start address must not be in R0");
4597
4598 Label retry;
4599 bind(retry);
4600 Assembler::z_srst(end, start);
4601 Assembler::z_brc(Assembler::bcondOverflow /* CC==3 (iterate) */, retry);
4602 }
4603
4604 void MacroAssembler::search_string_uni(Register end, Register start) {
4605 assert(end->encoding() != 0, "end address must not be in R0");
4606 assert(start->encoding() != 0, "start address must not be in R0");
4607 assert(VM_Version::has_ETF3(), "instruction must be available");
4608
4609 Label retry;
4610 bind(retry);
4611 Assembler::z_srstu(end, start);
4612 Assembler::z_brc(Assembler::bcondOverflow /* CC==3 (iterate) */, retry);
4613 }
4614
4615 void MacroAssembler::kmac(Register srcBuff) {
4616 assert(srcBuff->encoding() != 0, "src buffer address can't be in Z_R0");
4617 assert(srcBuff->encoding() % 2 == 0, "src buffer/len must be an even/odd register pair");
4618
4619 Label retry;
4620 bind(retry);
4621 Assembler::z_kmac(Z_R0, srcBuff);
4622 Assembler::z_brc(Assembler::bcondOverflow /* CC==3 (iterate) */, retry);
4623 }
4624
4625 void MacroAssembler::kimd(Register srcBuff) {
4626 assert(srcBuff->encoding() != 0, "src buffer address can't be in Z_R0");
4627 assert(srcBuff->encoding() % 2 == 0, "src buffer/len must be an even/odd register pair");
4628
4629 Label retry;
4630 bind(retry);
4631 Assembler::z_kimd(Z_R0, srcBuff);
4632 Assembler::z_brc(Assembler::bcondOverflow /* CC==3 (iterate) */, retry);
4633 }
4634
4635 void MacroAssembler::klmd(Register srcBuff) {
4636 assert(srcBuff->encoding() != 0, "src buffer address can't be in Z_R0");
4637 assert(srcBuff->encoding() % 2 == 0, "src buffer/len must be an even/odd register pair");
4638
4639 Label retry;
4640 bind(retry);
4641 Assembler::z_klmd(Z_R0, srcBuff);
4642 Assembler::z_brc(Assembler::bcondOverflow /* CC==3 (iterate) */, retry);
4643 }
4644
4645 void MacroAssembler::km(Register dstBuff, Register srcBuff) {
4646 // DstBuff and srcBuff are allowed to be the same register (encryption in-place).
4647 // DstBuff and srcBuff storage must not overlap destructively, and neither must overlap the parameter block.
4648 assert(srcBuff->encoding() != 0, "src buffer address can't be in Z_R0");
4649 assert(dstBuff->encoding() % 2 == 0, "dst buffer addr must be an even register");
4650 assert(srcBuff->encoding() % 2 == 0, "src buffer addr/len must be an even/odd register pair");
4651
4652 Label retry;
4653 bind(retry);
4654 Assembler::z_km(dstBuff, srcBuff);
4655 Assembler::z_brc(Assembler::bcondOverflow /* CC==3 (iterate) */, retry);
4656 }
4657
4658 void MacroAssembler::kmc(Register dstBuff, Register srcBuff) {
4659 // DstBuff and srcBuff are allowed to be the same register (encryption in-place).
4660 // DstBuff and srcBuff storage must not overlap destructively, and neither must overlap the parameter block.
4661 assert(srcBuff->encoding() != 0, "src buffer address can't be in Z_R0");
4662 assert(dstBuff->encoding() % 2 == 0, "dst buffer addr must be an even register");
4663 assert(srcBuff->encoding() % 2 == 0, "src buffer addr/len must be an even/odd register pair");
4664
4665 Label retry;
4666 bind(retry);
4667 Assembler::z_kmc(dstBuff, srcBuff);
4668 Assembler::z_brc(Assembler::bcondOverflow /* CC==3 (iterate) */, retry);
4669 }
4670
4671 void MacroAssembler::cksm(Register crcBuff, Register srcBuff) {
4672 assert(srcBuff->encoding() % 2 == 0, "src buffer addr/len must be an even/odd register pair");
4673
4674 Label retry;
4675 bind(retry);
4676 Assembler::z_cksm(crcBuff, srcBuff);
4677 Assembler::z_brc(Assembler::bcondOverflow /* CC==3 (iterate) */, retry);
4678 }
4679
4680 void MacroAssembler::translate_oo(Register r1, Register r2, uint m3) {
4681 assert(r1->encoding() % 2 == 0, "dst addr/src len must be an even/odd register pair");
4682 assert((m3 & 0b1110) == 0, "Unused mask bits must be zero");
4683
4684 Label retry;
4685 bind(retry);
4686 Assembler::z_troo(r1, r2, m3);
4687 Assembler::z_brc(Assembler::bcondOverflow /* CC==3 (iterate) */, retry);
4688 }
4689
4690 void MacroAssembler::translate_ot(Register r1, Register r2, uint m3) {
4691 assert(r1->encoding() % 2 == 0, "dst addr/src len must be an even/odd register pair");
4692 assert((m3 & 0b1110) == 0, "Unused mask bits must be zero");
4693
4694 Label retry;
4695 bind(retry);
4696 Assembler::z_trot(r1, r2, m3);
4697 Assembler::z_brc(Assembler::bcondOverflow /* CC==3 (iterate) */, retry);
4698 }
4699
4700 void MacroAssembler::translate_to(Register r1, Register r2, uint m3) {
4701 assert(r1->encoding() % 2 == 0, "dst addr/src len must be an even/odd register pair");
4702 assert((m3 & 0b1110) == 0, "Unused mask bits must be zero");
4703
4704 Label retry;
4705 bind(retry);
4706 Assembler::z_trto(r1, r2, m3);
4707 Assembler::z_brc(Assembler::bcondOverflow /* CC==3 (iterate) */, retry);
4708 }
4709
4710 void MacroAssembler::translate_tt(Register r1, Register r2, uint m3) {
4711 assert(r1->encoding() % 2 == 0, "dst addr/src len must be an even/odd register pair");
4712 assert((m3 & 0b1110) == 0, "Unused mask bits must be zero");
4713
4714 Label retry;
4715 bind(retry);
4716 Assembler::z_trtt(r1, r2, m3);
4717 Assembler::z_brc(Assembler::bcondOverflow /* CC==3 (iterate) */, retry);
4718 }
4719
4720 //---------------------------------------
4721 // Helpers for Intrinsic Emitters
4722 //---------------------------------------
4723
4724 /**
4725 * uint32_t crc;
4726 * timesXtoThe32[crc & 0xFF] ^ (crc >> 8);
4727 */
4728 void MacroAssembler::fold_byte_crc32(Register crc, Register val, Register table, Register tmp) {
4729 assert_different_registers(crc, table, tmp);
4730 assert_different_registers(val, table);
4731 if (crc == val) { // Must rotate first to use the unmodified value.
4732 rotate_then_insert(tmp, val, 56-2, 63-2, 2, true); // Insert byte 7 of val, shifted left by 2, into byte 6..7 of tmp, clear the rest.
4733 z_srl(crc, 8); // Unsigned shift, clear leftmost 8 bits.
4734 } else {
4735 z_srl(crc, 8); // Unsigned shift, clear leftmost 8 bits.
4736 rotate_then_insert(tmp, val, 56-2, 63-2, 2, true); // Insert byte 7 of val, shifted left by 2, into byte 6..7 of tmp, clear the rest.
4737 }
4738 z_x(crc, Address(table, tmp, 0));
4739 }
4740
4741 /**
4742 * uint32_t crc;
4743 * timesXtoThe32[crc & 0xFF] ^ (crc >> 8);
4744 */
4745 void MacroAssembler::fold_8bit_crc32(Register crc, Register table, Register tmp) {
4746 fold_byte_crc32(crc, crc, table, tmp);
4747 }
4748
4749 /**
4750 * Emits code to update CRC-32 with a byte value according to constants in table.
4751 *
4752 * @param [in,out]crc Register containing the crc.
4753 * @param [in]val Register containing the byte to fold into the CRC.
4754 * @param [in]table Register containing the table of crc constants.
4755 *
4756 * uint32_t crc;
4757 * val = crc_table[(val ^ crc) & 0xFF];
4758 * crc = val ^ (crc >> 8);
4759 */
4760 void MacroAssembler::update_byte_crc32(Register crc, Register val, Register table) {
4761 z_xr(val, crc);
4762 fold_byte_crc32(crc, val, table, val);
4763 }
4764
4765
4766 /**
4767 * @param crc register containing existing CRC (32-bit)
4768 * @param buf register pointing to input byte buffer (byte*)
4769 * @param len register containing number of bytes
4770 * @param table register pointing to CRC table
4771 */
4772 void MacroAssembler::update_byteLoop_crc32(Register crc, Register buf, Register len, Register table, Register data) {
4773 assert_different_registers(crc, buf, len, table, data);
4774
4775 Label L_mainLoop, L_done;
4776 const int mainLoop_stepping = 1;
4777
4778 // Process all bytes in a single-byte loop.
4779 z_ltr(len, len);
4780 z_brnh(L_done);
4781
4782 bind(L_mainLoop);
4783 z_llgc(data, Address(buf, (intptr_t)0));// Current byte of input buffer (zero extended). Avoids garbage in upper half of register.
4784 add2reg(buf, mainLoop_stepping); // Advance buffer position.
4785 update_byte_crc32(crc, data, table);
4786 z_brct(len, L_mainLoop); // Iterate.
4787
4788 bind(L_done);
4789 }
4790
4791 /**
4792 * Emits code to update CRC-32 with a 4-byte value according to constants in table.
4793 * Implementation according to jdk/src/share/native/java/util/zip/zlib-1.2.8/crc32.c.
4794 *
4795 */
4796 void MacroAssembler::update_1word_crc32(Register crc, Register buf, Register table, int bufDisp, int bufInc,
4797 Register t0, Register t1, Register t2, Register t3) {
4798 // This is what we implement (the DOBIG4 part):
4799 //
4800 // #define DOBIG4 c ^= *++buf4; \
4801 // c = crc_table[4][c & 0xff] ^ crc_table[5][(c >> 8) & 0xff] ^ \
4802 // crc_table[6][(c >> 16) & 0xff] ^ crc_table[7][c >> 24]
4803 // #define DOBIG32 DOBIG4; DOBIG4; DOBIG4; DOBIG4; DOBIG4; DOBIG4; DOBIG4; DOBIG4
4804 // Pre-calculate (constant) column offsets, use columns 4..7 for big-endian.
4805 const int ix0 = 4*(4*CRC32_COLUMN_SIZE);
4806 const int ix1 = 5*(4*CRC32_COLUMN_SIZE);
4807 const int ix2 = 6*(4*CRC32_COLUMN_SIZE);
4808 const int ix3 = 7*(4*CRC32_COLUMN_SIZE);
4809
4810 // XOR crc with next four bytes of buffer.
4811 lgr_if_needed(t0, crc);
4812 z_x(t0, Address(buf, bufDisp));
4813 if (bufInc != 0) {
4814 add2reg(buf, bufInc);
4815 }
4816
4817 // Chop crc into 4 single-byte pieces, shifted left 2 bits, to form the table indices.
4818 rotate_then_insert(t3, t0, 56-2, 63-2, 2, true); // ((c >> 0) & 0xff) << 2
4819 rotate_then_insert(t2, t0, 56-2, 63-2, 2-8, true); // ((c >> 8) & 0xff) << 2
4820 rotate_then_insert(t1, t0, 56-2, 63-2, 2-16, true); // ((c >> 16) & 0xff) << 2
4821 rotate_then_insert(t0, t0, 56-2, 63-2, 2-24, true); // ((c >> 24) & 0xff) << 2
4822
4823 // XOR indexed table values to calculate updated crc.
4824 z_ly(t2, Address(table, t2, (intptr_t)ix1));
4825 z_ly(t0, Address(table, t0, (intptr_t)ix3));
4826 z_xy(t2, Address(table, t3, (intptr_t)ix0));
4827 z_xy(t0, Address(table, t1, (intptr_t)ix2));
4828 z_xr(t0, t2); // Now t0 contains the updated CRC value.
4829 lgr_if_needed(crc, t0);
4830 }
4831
4832 /**
4833 * @param crc register containing existing CRC (32-bit)
4834 * @param buf register pointing to input byte buffer (byte*)
4835 * @param len register containing number of bytes
4836 * @param table register pointing to CRC table
4837 *
4838 * uses Z_R10..Z_R13 as work register. Must be saved/restored by caller!
4839 */
4840 void MacroAssembler::kernel_crc32_1word(Register crc, Register buf, Register len, Register table,
4841 Register t0, Register t1, Register t2, Register t3,
4842 bool invertCRC) {
4843 assert_different_registers(crc, buf, len, table);
4844
4845 Label L_mainLoop, L_tail;
4846 Register data = t0;
4847 Register ctr = Z_R0;
4848 const int mainLoop_stepping = 4;
4849 const int log_stepping = exact_log2(mainLoop_stepping);
4850
4851 // Don't test for len <= 0 here. This pathological case should not occur anyway.
4852 // Optimizing for it by adding a test and a branch seems to be a waste of CPU cycles.
4853 // The situation itself is detected and handled correctly by the conditional branches
4854 // following aghi(len, -stepping) and aghi(len, +stepping).
4855
4856 if (invertCRC) {
4857 not_(crc, noreg, false); // 1s complement of crc
4858 }
4859
4860 // Check for short (<4 bytes) buffer.
4861 z_srag(ctr, len, log_stepping);
4862 z_brnh(L_tail);
4863
4864 z_lrvr(crc, crc); // Revert byte order because we are dealing with big-endian data.
4865 rotate_then_insert(len, len, 64-log_stepping, 63, 0, true); // #bytes for tailLoop
4866
4867 BIND(L_mainLoop);
4868 update_1word_crc32(crc, buf, table, 0, mainLoop_stepping, crc, t1, t2, t3);
4869 z_brct(ctr, L_mainLoop); // Iterate.
4870
4871 z_lrvr(crc, crc); // Revert byte order back to original.
4872
4873 // Process last few (<8) bytes of buffer.
4874 BIND(L_tail);
4875 update_byteLoop_crc32(crc, buf, len, table, data);
4876
4877 if (invertCRC) {
4878 not_(crc, noreg, false); // 1s complement of crc
4879 }
4880 }
4881
4882 /**
4883 * @param crc register containing existing CRC (32-bit)
4884 * @param buf register pointing to input byte buffer (byte*)
4885 * @param len register containing number of bytes
4886 * @param table register pointing to CRC table
4887 */
4888 void MacroAssembler::kernel_crc32_1byte(Register crc, Register buf, Register len, Register table,
4889 Register t0, Register t1, Register t2, Register t3,
4890 bool invertCRC) {
4891 assert_different_registers(crc, buf, len, table);
4892 Register data = t0;
4893
4894 if (invertCRC) {
4895 not_(crc, noreg, false); // 1s complement of crc
4896 }
4897
4898 update_byteLoop_crc32(crc, buf, len, table, data);
4899
4900 if (invertCRC) {
4901 not_(crc, noreg, false); // 1s complement of crc
4902 }
4903 }
4904
4905 void MacroAssembler::kernel_crc32_singleByte(Register crc, Register buf, Register len, Register table, Register tmp,
4906 bool invertCRC) {
4907 assert_different_registers(crc, buf, len, table, tmp);
4908
4909 if (invertCRC) {
4910 not_(crc, noreg, false); // 1s complement of crc
4911 }
4912
4913 z_llgc(tmp, Address(buf, (intptr_t)0)); // Current byte of input buffer (zero extended). Avoids garbage in upper half of register.
4914 update_byte_crc32(crc, tmp, table);
4915
4916 if (invertCRC) {
4917 not_(crc, noreg, false); // 1s complement of crc
4918 }
4919 }
4920
4921 void MacroAssembler::kernel_crc32_singleByteReg(Register crc, Register val, Register table,
4922 bool invertCRC) {
4923 assert_different_registers(crc, val, table);
4924
4925 if (invertCRC) {
4926 not_(crc, noreg, false); // 1s complement of crc
4927 }
4928
4929 update_byte_crc32(crc, val, table);
4930
4931 if (invertCRC) {
4932 not_(crc, noreg, false); // 1s complement of crc
4933 }
4934 }
4935
4936 //
4937 // Code for BigInteger::multiplyToLen() intrinsic.
4938 //
4939
4940 // dest_lo += src1 + src2
4941 // dest_hi += carry1 + carry2
4942 // Z_R7 is destroyed !
4943 void MacroAssembler::add2_with_carry(Register dest_hi, Register dest_lo,
4944 Register src1, Register src2) {
4945 clear_reg(Z_R7);
4946 z_algr(dest_lo, src1);
4947 z_alcgr(dest_hi, Z_R7);
4948 z_algr(dest_lo, src2);
4949 z_alcgr(dest_hi, Z_R7);
4950 }
4951
4952 // Multiply 64 bit by 64 bit first loop.
4953 void MacroAssembler::multiply_64_x_64_loop(Register x, Register xstart,
4954 Register x_xstart,
4955 Register y, Register y_idx,
4956 Register z,
4957 Register carry,
4958 Register product,
4959 Register idx, Register kdx) {
4960 // jlong carry, x[], y[], z[];
4961 // for (int idx=ystart, kdx=ystart+1+xstart; idx >= 0; idx--, kdx--) {
4962 // huge_128 product = y[idx] * x[xstart] + carry;
4963 // z[kdx] = (jlong)product;
4964 // carry = (jlong)(product >>> 64);
4965 // }
4966 // z[xstart] = carry;
4967
4968 Label L_first_loop, L_first_loop_exit;
4969 Label L_one_x, L_one_y, L_multiply;
4970
4971 z_aghi(xstart, -1);
4972 z_brl(L_one_x); // Special case: length of x is 1.
4973
4974 // Load next two integers of x.
4975 z_sllg(Z_R1_scratch, xstart, LogBytesPerInt);
4976 mem2reg_opt(x_xstart, Address(x, Z_R1_scratch, 0));
4977
4978
4979 bind(L_first_loop);
4980
4981 z_aghi(idx, -1);
4982 z_brl(L_first_loop_exit);
4983 z_aghi(idx, -1);
4984 z_brl(L_one_y);
4985
4986 // Load next two integers of y.
4987 z_sllg(Z_R1_scratch, idx, LogBytesPerInt);
4988 mem2reg_opt(y_idx, Address(y, Z_R1_scratch, 0));
4989
4990
4991 bind(L_multiply);
4992
4993 Register multiplicand = product->successor();
4994 Register product_low = multiplicand;
4995
4996 lgr_if_needed(multiplicand, x_xstart);
4997 z_mlgr(product, y_idx); // multiplicand * y_idx -> product::multiplicand
4998 clear_reg(Z_R7);
4999 z_algr(product_low, carry); // Add carry to result.
5000 z_alcgr(product, Z_R7); // Add carry of the last addition.
5001 add2reg(kdx, -2);
5002
5003 // Store result.
5004 z_sllg(Z_R7, kdx, LogBytesPerInt);
5005 reg2mem_opt(product_low, Address(z, Z_R7, 0));
5006 lgr_if_needed(carry, product);
5007 z_bru(L_first_loop);
5008
5009
5010 bind(L_one_y); // Load one 32 bit portion of y as (0,value).
5011
5012 clear_reg(y_idx);
5013 mem2reg_opt(y_idx, Address(y, (intptr_t) 0), false);
5014 z_bru(L_multiply);
5015
5016
5017 bind(L_one_x); // Load one 32 bit portion of x as (0,value).
5018
5019 clear_reg(x_xstart);
5020 mem2reg_opt(x_xstart, Address(x, (intptr_t) 0), false);
5021 z_bru(L_first_loop);
5022
5023 bind(L_first_loop_exit);
5024 }
5025
5026 // Multiply 64 bit by 64 bit and add 128 bit.
5027 void MacroAssembler::multiply_add_128_x_128(Register x_xstart, Register y,
5028 Register z,
5029 Register yz_idx, Register idx,
5030 Register carry, Register product,
5031 int offset) {
5032 // huge_128 product = (y[idx] * x_xstart) + z[kdx] + carry;
5033 // z[kdx] = (jlong)product;
5034
5035 Register multiplicand = product->successor();
5036 Register product_low = multiplicand;
5037
5038 z_sllg(Z_R7, idx, LogBytesPerInt);
5039 mem2reg_opt(yz_idx, Address(y, Z_R7, offset));
5040
5041 lgr_if_needed(multiplicand, x_xstart);
5042 z_mlgr(product, yz_idx); // multiplicand * yz_idx -> product::multiplicand
5043 mem2reg_opt(yz_idx, Address(z, Z_R7, offset));
5044
5045 add2_with_carry(product, product_low, carry, yz_idx);
5046
5047 z_sllg(Z_R7, idx, LogBytesPerInt);
5048 reg2mem_opt(product_low, Address(z, Z_R7, offset));
5049
5050 }
5051
5052 // Multiply 128 bit by 128 bit. Unrolled inner loop.
5053 void MacroAssembler::multiply_128_x_128_loop(Register x_xstart,
5054 Register y, Register z,
5055 Register yz_idx, Register idx,
5056 Register jdx,
5057 Register carry, Register product,
5058 Register carry2) {
5059 // jlong carry, x[], y[], z[];
5060 // int kdx = ystart+1;
5061 // for (int idx=ystart-2; idx >= 0; idx -= 2) { // Third loop
5062 // huge_128 product = (y[idx+1] * x_xstart) + z[kdx+idx+1] + carry;
5063 // z[kdx+idx+1] = (jlong)product;
5064 // jlong carry2 = (jlong)(product >>> 64);
5065 // product = (y[idx] * x_xstart) + z[kdx+idx] + carry2;
5066 // z[kdx+idx] = (jlong)product;
5067 // carry = (jlong)(product >>> 64);
5068 // }
5069 // idx += 2;
5070 // if (idx > 0) {
5071 // product = (y[idx] * x_xstart) + z[kdx+idx] + carry;
5072 // z[kdx+idx] = (jlong)product;
5073 // carry = (jlong)(product >>> 64);
5074 // }
5075
5076 Label L_third_loop, L_third_loop_exit, L_post_third_loop_done;
5077
5078 // scale the index
5079 lgr_if_needed(jdx, idx);
5080 and_imm(jdx, 0xfffffffffffffffcL);
5081 rshift(jdx, 2);
5082
5083
5084 bind(L_third_loop);
5085
5086 z_aghi(jdx, -1);
5087 z_brl(L_third_loop_exit);
5088 add2reg(idx, -4);
5089
5090 multiply_add_128_x_128(x_xstart, y, z, yz_idx, idx, carry, product, 8);
5091 lgr_if_needed(carry2, product);
5092
5093 multiply_add_128_x_128(x_xstart, y, z, yz_idx, idx, carry2, product, 0);
5094 lgr_if_needed(carry, product);
5095 z_bru(L_third_loop);
5096
5097
5098 bind(L_third_loop_exit); // Handle any left-over operand parts.
5099
5100 and_imm(idx, 0x3);
5101 z_brz(L_post_third_loop_done);
5102
5103 Label L_check_1;
5104
5105 z_aghi(idx, -2);
5106 z_brl(L_check_1);
5107
5108 multiply_add_128_x_128(x_xstart, y, z, yz_idx, idx, carry, product, 0);
5109 lgr_if_needed(carry, product);
5110
5111
5112 bind(L_check_1);
5113
5114 add2reg(idx, 0x2);
5115 and_imm(idx, 0x1);
5116 z_aghi(idx, -1);
5117 z_brl(L_post_third_loop_done);
5118
5119 Register multiplicand = product->successor();
5120 Register product_low = multiplicand;
5121
5122 z_sllg(Z_R7, idx, LogBytesPerInt);
5123 clear_reg(yz_idx);
5124 mem2reg_opt(yz_idx, Address(y, Z_R7, 0), false);
5125 lgr_if_needed(multiplicand, x_xstart);
5126 z_mlgr(product, yz_idx); // multiplicand * yz_idx -> product::multiplicand
5127 clear_reg(yz_idx);
5128 mem2reg_opt(yz_idx, Address(z, Z_R7, 0), false);
5129
5130 add2_with_carry(product, product_low, yz_idx, carry);
5131
5132 z_sllg(Z_R7, idx, LogBytesPerInt);
5133 reg2mem_opt(product_low, Address(z, Z_R7, 0), false);
5134 rshift(product_low, 32);
5135
5136 lshift(product, 32);
5137 z_ogr(product_low, product);
5138 lgr_if_needed(carry, product_low);
5139
5140 bind(L_post_third_loop_done);
5141 }
5142
5143 void MacroAssembler::multiply_to_len(Register x, Register xlen,
5144 Register y, Register ylen,
5145 Register z,
5146 Register tmp1, Register tmp2,
5147 Register tmp3, Register tmp4,
5148 Register tmp5) {
5149 ShortBranchVerifier sbv(this);
5150
5151 assert_different_registers(x, xlen, y, ylen, z,
5152 tmp1, tmp2, tmp3, tmp4, tmp5, Z_R1_scratch, Z_R7);
5153 assert_different_registers(x, xlen, y, ylen, z,
5154 tmp1, tmp2, tmp3, tmp4, tmp5, Z_R8);
5155
5156 z_stmg(Z_R7, Z_R13, _z_abi(gpr7), Z_SP);
5157
5158 // In openJdk, we store the argument as 32-bit value to slot.
5159 Address zlen(Z_SP, _z_abi(remaining_cargs)); // Int in long on big endian.
5160
5161 const Register idx = tmp1;
5162 const Register kdx = tmp2;
5163 const Register xstart = tmp3;
5164
5165 const Register y_idx = tmp4;
5166 const Register carry = tmp5;
5167 const Register product = Z_R0_scratch;
5168 const Register x_xstart = Z_R8;
5169
5170 // First Loop.
5171 //
5172 // final static long LONG_MASK = 0xffffffffL;
5173 // int xstart = xlen - 1;
5174 // int ystart = ylen - 1;
5175 // long carry = 0;
5176 // for (int idx=ystart, kdx=ystart+1+xstart; idx >= 0; idx-, kdx--) {
5177 // long product = (y[idx] & LONG_MASK) * (x[xstart] & LONG_MASK) + carry;
5178 // z[kdx] = (int)product;
5179 // carry = product >>> 32;
5180 // }
5181 // z[xstart] = (int)carry;
5182 //
5183
5184 lgr_if_needed(idx, ylen); // idx = ylen
5185 z_llgf(kdx, zlen); // C2 does not respect int to long conversion for stub calls, thus load zero-extended.
5186 clear_reg(carry); // carry = 0
5187
5188 Label L_done;
5189
5190 lgr_if_needed(xstart, xlen);
5191 z_aghi(xstart, -1);
5192 z_brl(L_done);
5193
5194 multiply_64_x_64_loop(x, xstart, x_xstart, y, y_idx, z, carry, product, idx, kdx);
5195
5196 NearLabel L_second_loop;
5197 compare64_and_branch(kdx, RegisterOrConstant((intptr_t) 0), bcondEqual, L_second_loop);
5198
5199 NearLabel L_carry;
5200 z_aghi(kdx, -1);
5201 z_brz(L_carry);
5202
5203 // Store lower 32 bits of carry.
5204 z_sllg(Z_R1_scratch, kdx, LogBytesPerInt);
5205 reg2mem_opt(carry, Address(z, Z_R1_scratch, 0), false);
5206 rshift(carry, 32);
5207 z_aghi(kdx, -1);
5208
5209
5210 bind(L_carry);
5211
5212 // Store upper 32 bits of carry.
5213 z_sllg(Z_R1_scratch, kdx, LogBytesPerInt);
5214 reg2mem_opt(carry, Address(z, Z_R1_scratch, 0), false);
5215
5216 // Second and third (nested) loops.
5217 //
5218 // for (int i = xstart-1; i >= 0; i--) { // Second loop
5219 // carry = 0;
5220 // for (int jdx=ystart, k=ystart+1+i; jdx >= 0; jdx--, k--) { // Third loop
5221 // long product = (y[jdx] & LONG_MASK) * (x[i] & LONG_MASK) +
5222 // (z[k] & LONG_MASK) + carry;
5223 // z[k] = (int)product;
5224 // carry = product >>> 32;
5225 // }
5226 // z[i] = (int)carry;
5227 // }
5228 //
5229 // i = xlen, j = tmp1, k = tmp2, carry = tmp5, x[i] = rdx
5230
5231 const Register jdx = tmp1;
5232
5233 bind(L_second_loop);
5234
5235 clear_reg(carry); // carry = 0;
5236 lgr_if_needed(jdx, ylen); // j = ystart+1
5237
5238 z_aghi(xstart, -1); // i = xstart-1;
5239 z_brl(L_done);
5240
5241 // Use free slots in the current stackframe instead of push/pop.
5242 Address zsave(Z_SP, _z_abi(carg_1));
5243 reg2mem_opt(z, zsave);
5244
5245
5246 Label L_last_x;
5247
5248 z_sllg(Z_R1_scratch, xstart, LogBytesPerInt);
5249 load_address(z, Address(z, Z_R1_scratch, 4)); // z = z + k - j
5250 z_aghi(xstart, -1); // i = xstart-1;
5251 z_brl(L_last_x);
5252
5253 z_sllg(Z_R1_scratch, xstart, LogBytesPerInt);
5254 mem2reg_opt(x_xstart, Address(x, Z_R1_scratch, 0));
5255
5256
5257 Label L_third_loop_prologue;
5258
5259 bind(L_third_loop_prologue);
5260
5261 Address xsave(Z_SP, _z_abi(carg_2));
5262 Address xlensave(Z_SP, _z_abi(carg_3));
5263 Address ylensave(Z_SP, _z_abi(carg_4));
5264
5265 reg2mem_opt(x, xsave);
5266 reg2mem_opt(xstart, xlensave);
5267 reg2mem_opt(ylen, ylensave);
5268
5269
5270 multiply_128_x_128_loop(x_xstart, y, z, y_idx, jdx, ylen, carry, product, x);
5271
5272 mem2reg_opt(z, zsave);
5273 mem2reg_opt(x, xsave);
5274 mem2reg_opt(xlen, xlensave); // This is the decrement of the loop counter!
5275 mem2reg_opt(ylen, ylensave);
5276
5277 add2reg(tmp3, 1, xlen);
5278 z_sllg(Z_R1_scratch, tmp3, LogBytesPerInt);
5279 reg2mem_opt(carry, Address(z, Z_R1_scratch, 0), false);
5280 z_aghi(tmp3, -1);
5281 z_brl(L_done);
5282
5283 rshift(carry, 32);
5284 z_sllg(Z_R1_scratch, tmp3, LogBytesPerInt);
5285 reg2mem_opt(carry, Address(z, Z_R1_scratch, 0), false);
5286 z_bru(L_second_loop);
5287
5288 // Next infrequent code is moved outside loops.
5289 bind(L_last_x);
5290
5291 clear_reg(x_xstart);
5292 mem2reg_opt(x_xstart, Address(x, (intptr_t) 0), false);
5293 z_bru(L_third_loop_prologue);
5294
5295 bind(L_done);
5296
5297 z_lmg(Z_R7, Z_R13, _z_abi(gpr7), Z_SP);
5298 }
5299
5300 #ifndef PRODUCT
5301 // Assert if CC indicates "not equal" (check_equal==true) or "equal" (check_equal==false).
5302 void MacroAssembler::asm_assert(bool check_equal, const char *msg, int id) {
5303 Label ok;
5304 if (check_equal) {
5305 z_bre(ok);
5306 } else {
5307 z_brne(ok);
5308 }
5309 stop(msg, id);
5310 bind(ok);
5311 }
5312
5313 // Assert if CC indicates "low".
5314 void MacroAssembler::asm_assert_low(const char *msg, int id) {
5315 Label ok;
5316 z_brnl(ok);
5317 stop(msg, id);
5318 bind(ok);
5319 }
5320
5321 // Assert if CC indicates "high".
5322 void MacroAssembler::asm_assert_high(const char *msg, int id) {
5323 Label ok;
5324 z_brnh(ok);
5325 stop(msg, id);
5326 bind(ok);
5327 }
5328
5329 // Assert if CC indicates "not equal" (check_equal==true) or "equal" (check_equal==false)
5330 // generate non-relocatable code.
5331 void MacroAssembler::asm_assert_static(bool check_equal, const char *msg, int id) {
5332 Label ok;
5333 if (check_equal) { z_bre(ok); }
5334 else { z_brne(ok); }
5335 stop_static(msg, id);
5336 bind(ok);
5337 }
5338
5339 void MacroAssembler::asm_assert_mems_zero(bool check_equal, bool allow_relocation, int size, int64_t mem_offset,
5340 Register mem_base, const char* msg, int id) {
5341 switch (size) {
5342 case 4:
5343 load_and_test_int(Z_R0, Address(mem_base, mem_offset));
5344 break;
5345 case 8:
5346 load_and_test_long(Z_R0, Address(mem_base, mem_offset));
5347 break;
5348 default:
5349 ShouldNotReachHere();
5350 }
5351 if (allow_relocation) { asm_assert(check_equal, msg, id); }
5352 else { asm_assert_static(check_equal, msg, id); }
5353 }
5354
5355 // Check the condition
5356 // expected_size == FP - SP
5357 // after transformation:
5358 // expected_size - FP + SP == 0
5359 // Destroys Register expected_size if no tmp register is passed.
5360 void MacroAssembler::asm_assert_frame_size(Register expected_size, Register tmp, const char* msg, int id) {
5361 if (tmp == noreg) {
5362 tmp = expected_size;
5363 } else {
5364 if (tmp != expected_size) {
5365 z_lgr(tmp, expected_size);
5366 }
5367 z_algr(tmp, Z_SP);
5368 z_slg(tmp, 0, Z_R0, Z_SP);
5369 asm_assert_eq(msg, id);
5370 }
5371 }
5372 #endif // !PRODUCT
5373
5374 void MacroAssembler::verify_thread() {
5375 if (VerifyThread) {
5376 unimplemented("", 117);
5377 }
5378 }
5379
5380 // Save and restore functions: Exclude Z_R0.
5381 void MacroAssembler::save_volatile_regs(Register dst, int offset, bool include_fp, bool include_flags) {
5382 z_stmg(Z_R1, Z_R5, offset, dst); offset += 5 * BytesPerWord;
5383 if (include_fp) {
5384 z_std(Z_F0, Address(dst, offset)); offset += BytesPerWord;
5385 z_std(Z_F1, Address(dst, offset)); offset += BytesPerWord;
5386 z_std(Z_F2, Address(dst, offset)); offset += BytesPerWord;
5387 z_std(Z_F3, Address(dst, offset)); offset += BytesPerWord;
5388 z_std(Z_F4, Address(dst, offset)); offset += BytesPerWord;
5389 z_std(Z_F5, Address(dst, offset)); offset += BytesPerWord;
5390 z_std(Z_F6, Address(dst, offset)); offset += BytesPerWord;
5391 z_std(Z_F7, Address(dst, offset)); offset += BytesPerWord;
5392 }
5393 if (include_flags) {
5394 Label done;
5395 z_mvi(Address(dst, offset), 2); // encoding: equal
5396 z_bre(done);
5397 z_mvi(Address(dst, offset), 4); // encoding: higher
5398 z_brh(done);
5399 z_mvi(Address(dst, offset), 1); // encoding: lower
5400 bind(done);
5401 }
5402 }
5403 void MacroAssembler::restore_volatile_regs(Register src, int offset, bool include_fp, bool include_flags) {
5404 z_lmg(Z_R1, Z_R5, offset, src); offset += 5 * BytesPerWord;
5405 if (include_fp) {
5406 z_ld(Z_F0, Address(src, offset)); offset += BytesPerWord;
5407 z_ld(Z_F1, Address(src, offset)); offset += BytesPerWord;
5408 z_ld(Z_F2, Address(src, offset)); offset += BytesPerWord;
5409 z_ld(Z_F3, Address(src, offset)); offset += BytesPerWord;
5410 z_ld(Z_F4, Address(src, offset)); offset += BytesPerWord;
5411 z_ld(Z_F5, Address(src, offset)); offset += BytesPerWord;
5412 z_ld(Z_F6, Address(src, offset)); offset += BytesPerWord;
5413 z_ld(Z_F7, Address(src, offset)); offset += BytesPerWord;
5414 }
5415 if (include_flags) {
5416 z_cli(Address(src, offset), 2); // see encoding above
5417 }
5418 }
5419
5420 // Plausibility check for oops.
5421 void MacroAssembler::verify_oop(Register oop, const char* msg) {
5422 if (!VerifyOops) return;
5423
5424 BLOCK_COMMENT("verify_oop {");
5425 unsigned int nbytes_save = (5 + 8 + 1) * BytesPerWord;
5426 address entry_addr = StubRoutines::verify_oop_subroutine_entry_address();
5427
5428 save_return_pc();
5429
5430 // Push frame, but preserve flags
5431 z_lgr(Z_R0, Z_SP);
5432 z_lay(Z_SP, -((int64_t)nbytes_save + frame::z_abi_160_size), Z_SP);
5433 z_stg(Z_R0, _z_abi(callers_sp), Z_SP);
5434
5435 save_volatile_regs(Z_SP, frame::z_abi_160_size, true, true);
5436
5437 lgr_if_needed(Z_ARG2, oop);
5438 load_const_optimized(Z_ARG1, (address)msg);
5439 load_const_optimized(Z_R1, entry_addr);
5440 z_lg(Z_R1, 0, Z_R1);
5441 call_c(Z_R1);
5442
5443 restore_volatile_regs(Z_SP, frame::z_abi_160_size, true, true);
5444 pop_frame();
5445 restore_return_pc();
5446
5447 BLOCK_COMMENT("} verify_oop ");
5448 }
5449
5450 void MacroAssembler::verify_oop_addr(Address addr, const char* msg) {
5451 if (!VerifyOops) return;
5452
5453 BLOCK_COMMENT("verify_oop {");
5454 unsigned int nbytes_save = (5 + 8) * BytesPerWord;
5455 address entry_addr = StubRoutines::verify_oop_subroutine_entry_address();
5456
5457 save_return_pc();
5458 unsigned int frame_size = push_frame_abi160(nbytes_save); // kills Z_R0
5459 save_volatile_regs(Z_SP, frame::z_abi_160_size, true, false);
5460
5461 z_lg(Z_ARG2, addr.plus_disp(frame_size));
5462 load_const_optimized(Z_ARG1, (address)msg);
5463 load_const_optimized(Z_R1, entry_addr);
5464 z_lg(Z_R1, 0, Z_R1);
5465 call_c(Z_R1);
5466
5467 restore_volatile_regs(Z_SP, frame::z_abi_160_size, true, false);
5468 pop_frame();
5469 restore_return_pc();
5470
5471 BLOCK_COMMENT("} verify_oop ");
5472 }
5473
5474 const char* MacroAssembler::stop_types[] = {
5475 "stop",
5476 "untested",
5477 "unimplemented",
5478 "shouldnotreachhere"
5479 };
5480
5481 static void stop_on_request(const char* tp, const char* msg) {
5482 tty->print("Z assembly code requires stop: (%s) %s\n", tp, msg);
5483 guarantee(false, "Z assembly code requires stop: %s", msg);
5484 }
5485
5486 void MacroAssembler::stop(int type, const char* msg, int id) {
5487 BLOCK_COMMENT(err_msg("stop: %s {", msg));
5488
5489 // Setup arguments.
5490 load_const(Z_ARG1, (void*) stop_types[type%stop_end]);
5491 load_const(Z_ARG2, (void*) msg);
5492 get_PC(Z_R14); // Following code pushes a frame without entering a new function. Use current pc as return address.
5493 save_return_pc(); // Saves return pc Z_R14.
5494 push_frame_abi160(0);
5495 call_VM_leaf(CAST_FROM_FN_PTR(address, stop_on_request), Z_ARG1, Z_ARG2);
5496 // The plain disassembler does not recognize illtrap. It instead displays
5497 // a 32-bit value. Issuing two illtraps assures the disassembler finds
5498 // the proper beginning of the next instruction.
5499 z_illtrap(); // Illegal instruction.
5500 z_illtrap(); // Illegal instruction.
5501
5502 BLOCK_COMMENT(" } stop");
5503 }
5504
5505 // Special version of stop() for code size reduction.
5506 // Reuses the previously generated call sequence, if any.
5507 // Generates the call sequence on its own, if necessary.
5508 // Note: This code will work only in non-relocatable code!
5509 // The relative address of the data elements (arg1, arg2) must not change.
5510 // The reentry point must not move relative to it's users. This prerequisite
5511 // should be given for "hand-written" code, if all chain calls are in the same code blob.
5512 // Generated code must not undergo any transformation, e.g. ShortenBranches, to be safe.
5513 address MacroAssembler::stop_chain(address reentry, int type, const char* msg, int id, bool allow_relocation) {
5514 BLOCK_COMMENT(err_msg("stop_chain(%s,%s): %s {", reentry==NULL?"init":"cont", allow_relocation?"reloc ":"static", msg));
5515
5516 // Setup arguments.
5517 if (allow_relocation) {
5518 // Relocatable version (for comparison purposes). Remove after some time.
5519 load_const(Z_ARG1, (void*) stop_types[type%stop_end]);
5520 load_const(Z_ARG2, (void*) msg);
5521 } else {
5522 load_absolute_address(Z_ARG1, (address)stop_types[type%stop_end]);
5523 load_absolute_address(Z_ARG2, (address)msg);
5524 }
5525 if ((reentry != NULL) && RelAddr::is_in_range_of_RelAddr16(reentry, pc())) {
5526 BLOCK_COMMENT("branch to reentry point:");
5527 z_brc(bcondAlways, reentry);
5528 } else {
5529 BLOCK_COMMENT("reentry point:");
5530 reentry = pc(); // Re-entry point for subsequent stop calls.
5531 save_return_pc(); // Saves return pc Z_R14.
5532 push_frame_abi160(0);
5533 if (allow_relocation) {
5534 reentry = NULL; // Prevent reentry if code relocation is allowed.
5535 call_VM_leaf(CAST_FROM_FN_PTR(address, stop_on_request), Z_ARG1, Z_ARG2);
5536 } else {
5537 call_VM_leaf_static(CAST_FROM_FN_PTR(address, stop_on_request), Z_ARG1, Z_ARG2);
5538 }
5539 z_illtrap(); // Illegal instruction as emergency stop, should the above call return.
5540 }
5541 BLOCK_COMMENT(" } stop_chain");
5542
5543 return reentry;
5544 }
5545
5546 // Special version of stop() for code size reduction.
5547 // Assumes constant relative addresses for data and runtime call.
5548 void MacroAssembler::stop_static(int type, const char* msg, int id) {
5549 stop_chain(NULL, type, msg, id, false);
5550 }
5551
5552 void MacroAssembler::stop_subroutine() {
5553 unimplemented("stop_subroutine", 710);
5554 }
5555
5556 // Prints msg to stdout from within generated code..
5557 void MacroAssembler::warn(const char* msg) {
5558 RegisterSaver::save_live_registers(this, RegisterSaver::all_registers, Z_R14);
5559 load_absolute_address(Z_R1, (address) warning);
5560 load_absolute_address(Z_ARG1, (address) msg);
5561 (void) call(Z_R1);
5562 RegisterSaver::restore_live_registers(this, RegisterSaver::all_registers);
5563 }
5564
5565 #ifndef PRODUCT
5566
5567 // Write pattern 0x0101010101010101 in region [low-before, high+after].
5568 void MacroAssembler::zap_from_to(Register low, Register high, Register val, Register addr, int before, int after) {
5569 if (!ZapEmptyStackFields) return;
5570 BLOCK_COMMENT("zap memory region {");
5571 load_const_optimized(val, 0x0101010101010101);
5572 int size = before + after;
5573 if (low == high && size < 5 && size > 0) {
5574 int offset = -before*BytesPerWord;
5575 for (int i = 0; i < size; ++i) {
5576 z_stg(val, Address(low, offset));
5577 offset +=(1*BytesPerWord);
5578 }
5579 } else {
5580 add2reg(addr, -before*BytesPerWord, low);
5581 if (after) {
5582 #ifdef ASSERT
5583 jlong check = after * BytesPerWord;
5584 assert(Immediate::is_simm32(check) && Immediate::is_simm32(-check), "value not encodable !");
5585 #endif
5586 add2reg(high, after * BytesPerWord);
5587 }
5588 NearLabel loop;
5589 bind(loop);
5590 z_stg(val, Address(addr));
5591 add2reg(addr, 8);
5592 compare64_and_branch(addr, high, bcondNotHigh, loop);
5593 if (after) {
5594 add2reg(high, -after * BytesPerWord);
5595 }
5596 }
5597 BLOCK_COMMENT("} zap memory region");
5598 }
5599 #endif // !PRODUCT
5600
5601 SkipIfEqual::SkipIfEqual(MacroAssembler* masm, const bool* flag_addr, bool value, Register _rscratch) {
5602 _masm = masm;
5603 _masm->load_absolute_address(_rscratch, (address)flag_addr);
5604 _masm->load_and_test_int(_rscratch, Address(_rscratch));
5605 if (value) {
5606 _masm->z_brne(_label); // Skip if true, i.e. != 0.
5607 } else {
5608 _masm->z_bre(_label); // Skip if false, i.e. == 0.
5609 }
5610 }
5611
5612 SkipIfEqual::~SkipIfEqual() {
5613 _masm->bind(_label);
5614 }