1 /*
2 * Copyright (c) 1997, 2022, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2012, 2021 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/macroAssembler.inline.hpp"
28 #include "code/debugInfoRec.hpp"
29 #include "code/icBuffer.hpp"
30 #include "code/vtableStubs.hpp"
31 #include "frame_ppc.hpp"
32 #include "compiler/oopMap.hpp"
33 #include "gc/shared/gcLocker.hpp"
34 #include "interpreter/interpreter.hpp"
35 #include "interpreter/interp_masm.hpp"
36 #include "memory/resourceArea.hpp"
37 #include "oops/compiledICHolder.hpp"
38 #include "oops/klass.inline.hpp"
39 #include "prims/methodHandles.hpp"
40 #include "runtime/jniHandles.hpp"
41 #include "runtime/safepointMechanism.hpp"
42 #include "runtime/sharedRuntime.hpp"
43 #include "runtime/signature.hpp"
44 #include "runtime/stubRoutines.hpp"
45 #include "runtime/vframeArray.hpp"
46 #include "utilities/align.hpp"
47 #include "utilities/macros.hpp"
48 #include "vmreg_ppc.inline.hpp"
49 #ifdef COMPILER1
50 #include "c1/c1_Runtime1.hpp"
51 #endif
52 #ifdef COMPILER2
53 #include "opto/ad.hpp"
54 #include "opto/runtime.hpp"
55 #endif
56
57 #include <alloca.h>
58
59 #define __ masm->
60
61 #ifdef PRODUCT
62 #define BLOCK_COMMENT(str) // nothing
63 #else
64 #define BLOCK_COMMENT(str) __ block_comment(str)
65 #endif
66
67 #define BIND(label) bind(label); BLOCK_COMMENT(#label ":")
68
69
70 class RegisterSaver {
71 // Used for saving volatile registers.
72 public:
73
74 // Support different return pc locations.
75 enum ReturnPCLocation {
76 return_pc_is_lr,
77 return_pc_is_pre_saved,
78 return_pc_is_thread_saved_exception_pc
79 };
80
81 static OopMap* push_frame_reg_args_and_save_live_registers(MacroAssembler* masm,
82 int* out_frame_size_in_bytes,
83 bool generate_oop_map,
84 int return_pc_adjustment,
85 ReturnPCLocation return_pc_location,
86 bool save_vectors = false);
87 static void restore_live_registers_and_pop_frame(MacroAssembler* masm,
88 int frame_size_in_bytes,
89 bool restore_ctr,
90 bool save_vectors = false);
91
92 static void push_frame_and_save_argument_registers(MacroAssembler* masm,
93 Register r_temp,
94 int frame_size,
95 int total_args,
96 const VMRegPair *regs, const VMRegPair *regs2 = NULL);
97 static void restore_argument_registers_and_pop_frame(MacroAssembler*masm,
98 int frame_size,
99 int total_args,
100 const VMRegPair *regs, const VMRegPair *regs2 = NULL);
101
102 // During deoptimization only the result registers need to be restored
103 // all the other values have already been extracted.
104 static void restore_result_registers(MacroAssembler* masm, int frame_size_in_bytes);
105
106 // Constants and data structures:
107
108 typedef enum {
109 int_reg,
110 float_reg,
111 special_reg,
112 vs_reg
113 } RegisterType;
114
115 typedef enum {
116 reg_size = 8,
117 half_reg_size = reg_size / 2,
118 vs_reg_size = 16
119 } RegisterConstants;
120
121 typedef struct {
122 RegisterType reg_type;
123 int reg_num;
124 VMReg vmreg;
125 } LiveRegType;
126 };
127
128
129 #define RegisterSaver_LiveIntReg(regname) \
130 { RegisterSaver::int_reg, regname->encoding(), regname->as_VMReg() }
131
132 #define RegisterSaver_LiveFloatReg(regname) \
133 { RegisterSaver::float_reg, regname->encoding(), regname->as_VMReg() }
134
135 #define RegisterSaver_LiveSpecialReg(regname) \
136 { RegisterSaver::special_reg, regname->encoding(), regname->as_VMReg() }
137
138 #define RegisterSaver_LiveVSReg(regname) \
139 { RegisterSaver::vs_reg, regname->encoding(), regname->as_VMReg() }
140
141 static const RegisterSaver::LiveRegType RegisterSaver_LiveRegs[] = {
142 // Live registers which get spilled to the stack. Register
143 // positions in this array correspond directly to the stack layout.
144
145 //
146 // live special registers:
147 //
148 RegisterSaver_LiveSpecialReg(SR_CTR),
149 //
150 // live float registers:
151 //
152 RegisterSaver_LiveFloatReg( F0 ),
153 RegisterSaver_LiveFloatReg( F1 ),
154 RegisterSaver_LiveFloatReg( F2 ),
155 RegisterSaver_LiveFloatReg( F3 ),
156 RegisterSaver_LiveFloatReg( F4 ),
157 RegisterSaver_LiveFloatReg( F5 ),
158 RegisterSaver_LiveFloatReg( F6 ),
159 RegisterSaver_LiveFloatReg( F7 ),
160 RegisterSaver_LiveFloatReg( F8 ),
161 RegisterSaver_LiveFloatReg( F9 ),
162 RegisterSaver_LiveFloatReg( F10 ),
163 RegisterSaver_LiveFloatReg( F11 ),
164 RegisterSaver_LiveFloatReg( F12 ),
165 RegisterSaver_LiveFloatReg( F13 ),
166 RegisterSaver_LiveFloatReg( F14 ),
167 RegisterSaver_LiveFloatReg( F15 ),
168 RegisterSaver_LiveFloatReg( F16 ),
169 RegisterSaver_LiveFloatReg( F17 ),
170 RegisterSaver_LiveFloatReg( F18 ),
171 RegisterSaver_LiveFloatReg( F19 ),
172 RegisterSaver_LiveFloatReg( F20 ),
173 RegisterSaver_LiveFloatReg( F21 ),
174 RegisterSaver_LiveFloatReg( F22 ),
175 RegisterSaver_LiveFloatReg( F23 ),
176 RegisterSaver_LiveFloatReg( F24 ),
177 RegisterSaver_LiveFloatReg( F25 ),
178 RegisterSaver_LiveFloatReg( F26 ),
179 RegisterSaver_LiveFloatReg( F27 ),
180 RegisterSaver_LiveFloatReg( F28 ),
181 RegisterSaver_LiveFloatReg( F29 ),
182 RegisterSaver_LiveFloatReg( F30 ),
183 RegisterSaver_LiveFloatReg( F31 ),
184 //
185 // live integer registers:
186 //
187 RegisterSaver_LiveIntReg( R0 ),
188 //RegisterSaver_LiveIntReg( R1 ), // stack pointer
189 RegisterSaver_LiveIntReg( R2 ),
190 RegisterSaver_LiveIntReg( R3 ),
191 RegisterSaver_LiveIntReg( R4 ),
192 RegisterSaver_LiveIntReg( R5 ),
193 RegisterSaver_LiveIntReg( R6 ),
194 RegisterSaver_LiveIntReg( R7 ),
195 RegisterSaver_LiveIntReg( R8 ),
196 RegisterSaver_LiveIntReg( R9 ),
197 RegisterSaver_LiveIntReg( R10 ),
198 RegisterSaver_LiveIntReg( R11 ),
199 RegisterSaver_LiveIntReg( R12 ),
200 //RegisterSaver_LiveIntReg( R13 ), // system thread id
201 RegisterSaver_LiveIntReg( R14 ),
202 RegisterSaver_LiveIntReg( R15 ),
203 RegisterSaver_LiveIntReg( R16 ),
204 RegisterSaver_LiveIntReg( R17 ),
205 RegisterSaver_LiveIntReg( R18 ),
206 RegisterSaver_LiveIntReg( R19 ),
207 RegisterSaver_LiveIntReg( R20 ),
208 RegisterSaver_LiveIntReg( R21 ),
209 RegisterSaver_LiveIntReg( R22 ),
210 RegisterSaver_LiveIntReg( R23 ),
211 RegisterSaver_LiveIntReg( R24 ),
212 RegisterSaver_LiveIntReg( R25 ),
213 RegisterSaver_LiveIntReg( R26 ),
214 RegisterSaver_LiveIntReg( R27 ),
215 RegisterSaver_LiveIntReg( R28 ),
216 RegisterSaver_LiveIntReg( R29 ),
217 RegisterSaver_LiveIntReg( R30 ),
218 RegisterSaver_LiveIntReg( R31 ) // must be the last register (see save/restore functions below)
219 };
220
221 static const RegisterSaver::LiveRegType RegisterSaver_LiveVSRegs[] = {
222 //
223 // live vector scalar registers (optional, only these ones are used by C2):
224 //
225 RegisterSaver_LiveVSReg( VSR32 ),
226 RegisterSaver_LiveVSReg( VSR33 ),
227 RegisterSaver_LiveVSReg( VSR34 ),
228 RegisterSaver_LiveVSReg( VSR35 ),
229 RegisterSaver_LiveVSReg( VSR36 ),
230 RegisterSaver_LiveVSReg( VSR37 ),
231 RegisterSaver_LiveVSReg( VSR38 ),
232 RegisterSaver_LiveVSReg( VSR39 ),
233 RegisterSaver_LiveVSReg( VSR40 ),
234 RegisterSaver_LiveVSReg( VSR41 ),
235 RegisterSaver_LiveVSReg( VSR42 ),
236 RegisterSaver_LiveVSReg( VSR43 ),
237 RegisterSaver_LiveVSReg( VSR44 ),
238 RegisterSaver_LiveVSReg( VSR45 ),
239 RegisterSaver_LiveVSReg( VSR46 ),
240 RegisterSaver_LiveVSReg( VSR47 ),
241 RegisterSaver_LiveVSReg( VSR48 ),
242 RegisterSaver_LiveVSReg( VSR49 ),
243 RegisterSaver_LiveVSReg( VSR50 ),
244 RegisterSaver_LiveVSReg( VSR51 )
245 };
246
247
248 OopMap* RegisterSaver::push_frame_reg_args_and_save_live_registers(MacroAssembler* masm,
249 int* out_frame_size_in_bytes,
250 bool generate_oop_map,
251 int return_pc_adjustment,
252 ReturnPCLocation return_pc_location,
253 bool save_vectors) {
254 // Push an abi_reg_args-frame and store all registers which may be live.
255 // If requested, create an OopMap: Record volatile registers as
256 // callee-save values in an OopMap so their save locations will be
257 // propagated to the RegisterMap of the caller frame during
258 // StackFrameStream construction (needed for deoptimization; see
259 // compiledVFrame::create_stack_value).
260 // If return_pc_adjustment != 0 adjust the return pc by return_pc_adjustment.
261 // Updated return pc is returned in R31 (if not return_pc_is_pre_saved).
262
263 // calculate frame size
264 const int regstosave_num = sizeof(RegisterSaver_LiveRegs) /
265 sizeof(RegisterSaver::LiveRegType);
266 const int vsregstosave_num = save_vectors ? (sizeof(RegisterSaver_LiveVSRegs) /
267 sizeof(RegisterSaver::LiveRegType))
268 : 0;
269 const int register_save_size = regstosave_num * reg_size + vsregstosave_num * vs_reg_size;
270 const int frame_size_in_bytes = align_up(register_save_size, frame::alignment_in_bytes)
271 + frame::abi_reg_args_size;
272
273 *out_frame_size_in_bytes = frame_size_in_bytes;
274 const int frame_size_in_slots = frame_size_in_bytes / sizeof(jint);
275 const int register_save_offset = frame_size_in_bytes - register_save_size;
276
277 // OopMap frame size is in c2 stack slots (sizeof(jint)) not bytes or words.
278 OopMap* map = generate_oop_map ? new OopMap(frame_size_in_slots, 0) : NULL;
279
280 BLOCK_COMMENT("push_frame_reg_args_and_save_live_registers {");
281
282 // push a new frame
283 __ push_frame(frame_size_in_bytes, noreg);
284
285 // Save some registers in the last (non-vector) slots of the new frame so we
286 // can use them as scratch regs or to determine the return pc.
287 __ std(R31, frame_size_in_bytes - reg_size - vsregstosave_num * vs_reg_size, R1_SP);
288 __ std(R30, frame_size_in_bytes - 2*reg_size - vsregstosave_num * vs_reg_size, R1_SP);
289
290 // save the flags
291 // Do the save_LR_CR by hand and adjust the return pc if requested.
292 __ mfcr(R30);
293 __ std(R30, frame_size_in_bytes + _abi0(cr), R1_SP);
294 switch (return_pc_location) {
295 case return_pc_is_lr: __ mflr(R31); break;
296 case return_pc_is_pre_saved: assert(return_pc_adjustment == 0, "unsupported"); break;
297 case return_pc_is_thread_saved_exception_pc: __ ld(R31, thread_(saved_exception_pc)); break;
298 default: ShouldNotReachHere();
299 }
300 if (return_pc_location != return_pc_is_pre_saved) {
301 if (return_pc_adjustment != 0) {
302 __ addi(R31, R31, return_pc_adjustment);
303 }
304 __ std(R31, frame_size_in_bytes + _abi0(lr), R1_SP);
305 }
306
307 // save all registers (ints and floats)
308 int offset = register_save_offset;
309
310 for (int i = 0; i < regstosave_num; i++) {
311 int reg_num = RegisterSaver_LiveRegs[i].reg_num;
312 int reg_type = RegisterSaver_LiveRegs[i].reg_type;
313
314 switch (reg_type) {
315 case RegisterSaver::int_reg: {
316 if (reg_num < 30) { // We spilled R30-31 right at the beginning.
317 __ std(as_Register(reg_num), offset, R1_SP);
318 }
319 break;
320 }
321 case RegisterSaver::float_reg: {
322 __ stfd(as_FloatRegister(reg_num), offset, R1_SP);
323 break;
324 }
325 case RegisterSaver::special_reg: {
326 if (reg_num == SR_CTR_SpecialRegisterEnumValue) {
327 __ mfctr(R30);
328 __ std(R30, offset, R1_SP);
329 } else {
330 Unimplemented();
331 }
332 break;
333 }
334 default:
335 ShouldNotReachHere();
336 }
337
338 if (generate_oop_map) {
339 map->set_callee_saved(VMRegImpl::stack2reg(offset>>2),
340 RegisterSaver_LiveRegs[i].vmreg);
341 map->set_callee_saved(VMRegImpl::stack2reg((offset + half_reg_size)>>2),
342 RegisterSaver_LiveRegs[i].vmreg->next());
343 }
344 offset += reg_size;
345 }
346
347 for (int i = 0; i < vsregstosave_num; i++) {
348 int reg_num = RegisterSaver_LiveVSRegs[i].reg_num;
349 int reg_type = RegisterSaver_LiveVSRegs[i].reg_type;
350
351 __ li(R30, offset);
352 __ stxvd2x(as_VectorSRegister(reg_num), R30, R1_SP);
353
354 if (generate_oop_map) {
355 map->set_callee_saved(VMRegImpl::stack2reg(offset>>2),
356 RegisterSaver_LiveVSRegs[i].vmreg);
357 }
358 offset += vs_reg_size;
359 }
360
361 assert(offset == frame_size_in_bytes, "consistency check");
362
363 BLOCK_COMMENT("} push_frame_reg_args_and_save_live_registers");
364
365 // And we're done.
366 return map;
367 }
368
369
370 // Pop the current frame and restore all the registers that we
371 // saved.
372 void RegisterSaver::restore_live_registers_and_pop_frame(MacroAssembler* masm,
373 int frame_size_in_bytes,
374 bool restore_ctr,
375 bool save_vectors) {
376 const int regstosave_num = sizeof(RegisterSaver_LiveRegs) /
377 sizeof(RegisterSaver::LiveRegType);
378 const int vsregstosave_num = save_vectors ? (sizeof(RegisterSaver_LiveVSRegs) /
379 sizeof(RegisterSaver::LiveRegType))
380 : 0;
381 const int register_save_size = regstosave_num * reg_size + vsregstosave_num * vs_reg_size;
382
383 const int register_save_offset = frame_size_in_bytes - register_save_size;
384
385 BLOCK_COMMENT("restore_live_registers_and_pop_frame {");
386
387 // restore all registers (ints and floats)
388 int offset = register_save_offset;
389
390 for (int i = 0; i < regstosave_num; i++) {
391 int reg_num = RegisterSaver_LiveRegs[i].reg_num;
392 int reg_type = RegisterSaver_LiveRegs[i].reg_type;
393
394 switch (reg_type) {
395 case RegisterSaver::int_reg: {
396 if (reg_num != 31) // R31 restored at the end, it's the tmp reg!
397 __ ld(as_Register(reg_num), offset, R1_SP);
398 break;
399 }
400 case RegisterSaver::float_reg: {
401 __ lfd(as_FloatRegister(reg_num), offset, R1_SP);
402 break;
403 }
404 case RegisterSaver::special_reg: {
405 if (reg_num == SR_CTR_SpecialRegisterEnumValue) {
406 if (restore_ctr) { // Nothing to do here if ctr already contains the next address.
407 __ ld(R31, offset, R1_SP);
408 __ mtctr(R31);
409 }
410 } else {
411 Unimplemented();
412 }
413 break;
414 }
415 default:
416 ShouldNotReachHere();
417 }
418 offset += reg_size;
419 }
420
421 for (int i = 0; i < vsregstosave_num; i++) {
422 int reg_num = RegisterSaver_LiveVSRegs[i].reg_num;
423 int reg_type = RegisterSaver_LiveVSRegs[i].reg_type;
424
425 __ li(R31, offset);
426 __ lxvd2x(as_VectorSRegister(reg_num), R31, R1_SP);
427
428 offset += vs_reg_size;
429 }
430
431 assert(offset == frame_size_in_bytes, "consistency check");
432
433 // restore link and the flags
434 __ ld(R31, frame_size_in_bytes + _abi0(lr), R1_SP);
435 __ mtlr(R31);
436
437 __ ld(R31, frame_size_in_bytes + _abi0(cr), R1_SP);
438 __ mtcr(R31);
439
440 // restore scratch register's value
441 __ ld(R31, frame_size_in_bytes - reg_size - vsregstosave_num * vs_reg_size, R1_SP);
442
443 // pop the frame
444 __ addi(R1_SP, R1_SP, frame_size_in_bytes);
445
446 BLOCK_COMMENT("} restore_live_registers_and_pop_frame");
447 }
448
449 void RegisterSaver::push_frame_and_save_argument_registers(MacroAssembler* masm, Register r_temp,
450 int frame_size,int total_args, const VMRegPair *regs,
451 const VMRegPair *regs2) {
452 __ push_frame(frame_size, r_temp);
453 int st_off = frame_size - wordSize;
454 for (int i = 0; i < total_args; i++) {
455 VMReg r_1 = regs[i].first();
456 VMReg r_2 = regs[i].second();
457 if (!r_1->is_valid()) {
458 assert(!r_2->is_valid(), "");
459 continue;
460 }
461 if (r_1->is_Register()) {
462 Register r = r_1->as_Register();
463 __ std(r, st_off, R1_SP);
464 st_off -= wordSize;
465 } else if (r_1->is_FloatRegister()) {
466 FloatRegister f = r_1->as_FloatRegister();
467 __ stfd(f, st_off, R1_SP);
468 st_off -= wordSize;
469 }
470 }
471 if (regs2 != NULL) {
472 for (int i = 0; i < total_args; i++) {
473 VMReg r_1 = regs2[i].first();
474 VMReg r_2 = regs2[i].second();
475 if (!r_1->is_valid()) {
476 assert(!r_2->is_valid(), "");
477 continue;
478 }
479 if (r_1->is_Register()) {
480 Register r = r_1->as_Register();
481 __ std(r, st_off, R1_SP);
482 st_off -= wordSize;
483 } else if (r_1->is_FloatRegister()) {
484 FloatRegister f = r_1->as_FloatRegister();
485 __ stfd(f, st_off, R1_SP);
486 st_off -= wordSize;
487 }
488 }
489 }
490 }
491
492 void RegisterSaver::restore_argument_registers_and_pop_frame(MacroAssembler*masm, int frame_size,
493 int total_args, const VMRegPair *regs,
494 const VMRegPair *regs2) {
495 int st_off = frame_size - wordSize;
496 for (int i = 0; i < total_args; i++) {
497 VMReg r_1 = regs[i].first();
498 VMReg r_2 = regs[i].second();
499 if (r_1->is_Register()) {
500 Register r = r_1->as_Register();
501 __ ld(r, st_off, R1_SP);
502 st_off -= wordSize;
503 } else if (r_1->is_FloatRegister()) {
504 FloatRegister f = r_1->as_FloatRegister();
505 __ lfd(f, st_off, R1_SP);
506 st_off -= wordSize;
507 }
508 }
509 if (regs2 != NULL)
510 for (int i = 0; i < total_args; i++) {
511 VMReg r_1 = regs2[i].first();
512 VMReg r_2 = regs2[i].second();
513 if (r_1->is_Register()) {
514 Register r = r_1->as_Register();
515 __ ld(r, st_off, R1_SP);
516 st_off -= wordSize;
517 } else if (r_1->is_FloatRegister()) {
518 FloatRegister f = r_1->as_FloatRegister();
519 __ lfd(f, st_off, R1_SP);
520 st_off -= wordSize;
521 }
522 }
523 __ pop_frame();
524 }
525
526 // Restore the registers that might be holding a result.
527 void RegisterSaver::restore_result_registers(MacroAssembler* masm, int frame_size_in_bytes) {
528 const int regstosave_num = sizeof(RegisterSaver_LiveRegs) /
529 sizeof(RegisterSaver::LiveRegType);
530 const int register_save_size = regstosave_num * reg_size; // VS registers not relevant here.
531 const int register_save_offset = frame_size_in_bytes - register_save_size;
532
533 // restore all result registers (ints and floats)
534 int offset = register_save_offset;
535 for (int i = 0; i < regstosave_num; i++) {
536 int reg_num = RegisterSaver_LiveRegs[i].reg_num;
537 int reg_type = RegisterSaver_LiveRegs[i].reg_type;
538 switch (reg_type) {
539 case RegisterSaver::int_reg: {
540 if (as_Register(reg_num)==R3_RET) // int result_reg
541 __ ld(as_Register(reg_num), offset, R1_SP);
542 break;
543 }
544 case RegisterSaver::float_reg: {
545 if (as_FloatRegister(reg_num)==F1_RET) // float result_reg
546 __ lfd(as_FloatRegister(reg_num), offset, R1_SP);
547 break;
548 }
549 case RegisterSaver::special_reg: {
550 // Special registers don't hold a result.
551 break;
552 }
553 default:
554 ShouldNotReachHere();
555 }
556 offset += reg_size;
557 }
558
559 assert(offset == frame_size_in_bytes, "consistency check");
560 }
561
562 // Is vector's size (in bytes) bigger than a size saved by default?
563 bool SharedRuntime::is_wide_vector(int size) {
564 // Note, MaxVectorSize == 8/16 on PPC64.
565 assert(size <= (SuperwordUseVSX ? 16 : 8), "%d bytes vectors are not supported", size);
566 return size > 8;
567 }
568
569 static int reg2slot(VMReg r) {
570 return r->reg2stack() + SharedRuntime::out_preserve_stack_slots();
571 }
572
573 static int reg2offset(VMReg r) {
574 return (r->reg2stack() + SharedRuntime::out_preserve_stack_slots()) * VMRegImpl::stack_slot_size;
575 }
576
577 // ---------------------------------------------------------------------------
578 // Read the array of BasicTypes from a signature, and compute where the
579 // arguments should go. Values in the VMRegPair regs array refer to 4-byte
580 // quantities. Values less than VMRegImpl::stack0 are registers, those above
581 // refer to 4-byte stack slots. All stack slots are based off of the stack pointer
582 // as framesizes are fixed.
583 // VMRegImpl::stack0 refers to the first slot 0(sp).
584 // and VMRegImpl::stack0+1 refers to the memory word 4-bytes higher. Register
585 // up to RegisterImpl::number_of_registers) are the 64-bit
586 // integer registers.
587
588 // Note: the INPUTS in sig_bt are in units of Java argument words, which are
589 // either 32-bit or 64-bit depending on the build. The OUTPUTS are in 32-bit
590 // units regardless of build. Of course for i486 there is no 64 bit build
591
592 // The Java calling convention is a "shifted" version of the C ABI.
593 // By skipping the first C ABI register we can call non-static jni methods
594 // with small numbers of arguments without having to shuffle the arguments
595 // at all. Since we control the java ABI we ought to at least get some
596 // advantage out of it.
597
598 const VMReg java_iarg_reg[8] = {
599 R3->as_VMReg(),
600 R4->as_VMReg(),
601 R5->as_VMReg(),
602 R6->as_VMReg(),
603 R7->as_VMReg(),
604 R8->as_VMReg(),
605 R9->as_VMReg(),
606 R10->as_VMReg()
607 };
608
609 const VMReg java_farg_reg[13] = {
610 F1->as_VMReg(),
611 F2->as_VMReg(),
612 F3->as_VMReg(),
613 F4->as_VMReg(),
614 F5->as_VMReg(),
615 F6->as_VMReg(),
616 F7->as_VMReg(),
617 F8->as_VMReg(),
618 F9->as_VMReg(),
619 F10->as_VMReg(),
620 F11->as_VMReg(),
621 F12->as_VMReg(),
622 F13->as_VMReg()
623 };
624
625 const int num_java_iarg_registers = sizeof(java_iarg_reg) / sizeof(java_iarg_reg[0]);
626 const int num_java_farg_registers = sizeof(java_farg_reg) / sizeof(java_farg_reg[0]);
627
628 int SharedRuntime::java_calling_convention(const BasicType *sig_bt,
629 VMRegPair *regs,
630 int total_args_passed) {
631 // C2c calling conventions for compiled-compiled calls.
632 // Put 8 ints/longs into registers _AND_ 13 float/doubles into
633 // registers _AND_ put the rest on the stack.
634
635 const int inc_stk_for_intfloat = 1; // 1 slots for ints and floats
636 const int inc_stk_for_longdouble = 2; // 2 slots for longs and doubles
637
638 int i;
639 VMReg reg;
640 int stk = 0;
641 int ireg = 0;
642 int freg = 0;
643
644 // We put the first 8 arguments into registers and the rest on the
645 // stack, float arguments are already in their argument registers
646 // due to c2c calling conventions (see calling_convention).
647 for (int i = 0; i < total_args_passed; ++i) {
648 switch(sig_bt[i]) {
649 case T_BOOLEAN:
650 case T_CHAR:
651 case T_BYTE:
652 case T_SHORT:
653 case T_INT:
654 if (ireg < num_java_iarg_registers) {
655 // Put int/ptr in register
656 reg = java_iarg_reg[ireg];
657 ++ireg;
658 } else {
659 // Put int/ptr on stack.
660 reg = VMRegImpl::stack2reg(stk);
661 stk += inc_stk_for_intfloat;
662 }
663 regs[i].set1(reg);
664 break;
665 case T_LONG:
666 assert((i + 1) < total_args_passed && sig_bt[i+1] == T_VOID, "expecting half");
667 if (ireg < num_java_iarg_registers) {
668 // Put long in register.
669 reg = java_iarg_reg[ireg];
670 ++ireg;
671 } else {
672 // Put long on stack. They must be aligned to 2 slots.
673 if (stk & 0x1) ++stk;
674 reg = VMRegImpl::stack2reg(stk);
675 stk += inc_stk_for_longdouble;
676 }
677 regs[i].set2(reg);
678 break;
679 case T_OBJECT:
680 case T_ARRAY:
681 case T_ADDRESS:
682 if (ireg < num_java_iarg_registers) {
683 // Put ptr in register.
684 reg = java_iarg_reg[ireg];
685 ++ireg;
686 } else {
687 // Put ptr on stack. Objects must be aligned to 2 slots too,
688 // because "64-bit pointers record oop-ishness on 2 aligned
689 // adjacent registers." (see OopFlow::build_oop_map).
690 if (stk & 0x1) ++stk;
691 reg = VMRegImpl::stack2reg(stk);
692 stk += inc_stk_for_longdouble;
693 }
694 regs[i].set2(reg);
695 break;
696 case T_FLOAT:
697 if (freg < num_java_farg_registers) {
698 // Put float in register.
699 reg = java_farg_reg[freg];
700 ++freg;
701 } else {
702 // Put float on stack.
703 reg = VMRegImpl::stack2reg(stk);
704 stk += inc_stk_for_intfloat;
705 }
706 regs[i].set1(reg);
707 break;
708 case T_DOUBLE:
709 assert((i + 1) < total_args_passed && sig_bt[i+1] == T_VOID, "expecting half");
710 if (freg < num_java_farg_registers) {
711 // Put double in register.
712 reg = java_farg_reg[freg];
713 ++freg;
714 } else {
715 // Put double on stack. They must be aligned to 2 slots.
716 if (stk & 0x1) ++stk;
717 reg = VMRegImpl::stack2reg(stk);
718 stk += inc_stk_for_longdouble;
719 }
720 regs[i].set2(reg);
721 break;
722 case T_VOID:
723 // Do not count halves.
724 regs[i].set_bad();
725 break;
726 default:
727 ShouldNotReachHere();
728 }
729 }
730 return align_up(stk, 2);
731 }
732
733 #if defined(COMPILER1) || defined(COMPILER2)
734 // Calling convention for calling C code.
735 int SharedRuntime::c_calling_convention(const BasicType *sig_bt,
736 VMRegPair *regs,
737 VMRegPair *regs2,
738 int total_args_passed) {
739 // Calling conventions for C runtime calls and calls to JNI native methods.
740 //
741 // PPC64 convention: Hoist the first 8 int/ptr/long's in the first 8
742 // int regs, leaving int regs undefined if the arg is flt/dbl. Hoist
743 // the first 13 flt/dbl's in the first 13 fp regs but additionally
744 // copy flt/dbl to the stack if they are beyond the 8th argument.
745
746 const VMReg iarg_reg[8] = {
747 R3->as_VMReg(),
748 R4->as_VMReg(),
749 R5->as_VMReg(),
750 R6->as_VMReg(),
751 R7->as_VMReg(),
752 R8->as_VMReg(),
753 R9->as_VMReg(),
754 R10->as_VMReg()
755 };
756
757 const VMReg farg_reg[13] = {
758 F1->as_VMReg(),
759 F2->as_VMReg(),
760 F3->as_VMReg(),
761 F4->as_VMReg(),
762 F5->as_VMReg(),
763 F6->as_VMReg(),
764 F7->as_VMReg(),
765 F8->as_VMReg(),
766 F9->as_VMReg(),
767 F10->as_VMReg(),
768 F11->as_VMReg(),
769 F12->as_VMReg(),
770 F13->as_VMReg()
771 };
772
773 // Check calling conventions consistency.
774 assert(sizeof(iarg_reg) / sizeof(iarg_reg[0]) == Argument::n_int_register_parameters_c &&
775 sizeof(farg_reg) / sizeof(farg_reg[0]) == Argument::n_float_register_parameters_c,
776 "consistency");
777
778 // `Stk' counts stack slots. Due to alignment, 32 bit values occupy
779 // 2 such slots, like 64 bit values do.
780 const int inc_stk_for_intfloat = 2; // 2 slots for ints and floats
781 const int inc_stk_for_longdouble = 2; // 2 slots for longs and doubles
782
783 int i;
784 VMReg reg;
785 // Leave room for C-compatible ABI_REG_ARGS.
786 int stk = (frame::abi_reg_args_size - frame::jit_out_preserve_size) / VMRegImpl::stack_slot_size;
787 int arg = 0;
788 int freg = 0;
789
790 // Avoid passing C arguments in the wrong stack slots.
791 #if defined(ABI_ELFv2)
792 assert((SharedRuntime::out_preserve_stack_slots() + stk) * VMRegImpl::stack_slot_size == 96,
793 "passing C arguments in wrong stack slots");
794 #else
795 assert((SharedRuntime::out_preserve_stack_slots() + stk) * VMRegImpl::stack_slot_size == 112,
796 "passing C arguments in wrong stack slots");
797 #endif
798 // We fill-out regs AND regs2 if an argument must be passed in a
799 // register AND in a stack slot. If regs2 is NULL in such a
800 // situation, we bail-out with a fatal error.
801 for (int i = 0; i < total_args_passed; ++i, ++arg) {
802 // Initialize regs2 to BAD.
803 if (regs2 != NULL) regs2[i].set_bad();
804
805 switch(sig_bt[i]) {
806
807 //
808 // If arguments 0-7 are integers, they are passed in integer registers.
809 // Argument i is placed in iarg_reg[i].
810 //
811 case T_BOOLEAN:
812 case T_CHAR:
813 case T_BYTE:
814 case T_SHORT:
815 case T_INT:
816 // We must cast ints to longs and use full 64 bit stack slots
817 // here. Thus fall through, handle as long.
818 case T_LONG:
819 case T_OBJECT:
820 case T_ARRAY:
821 case T_ADDRESS:
822 case T_METADATA:
823 // Oops are already boxed if required (JNI).
824 if (arg < Argument::n_int_register_parameters_c) {
825 reg = iarg_reg[arg];
826 } else {
827 reg = VMRegImpl::stack2reg(stk);
828 stk += inc_stk_for_longdouble;
829 }
830 regs[i].set2(reg);
831 break;
832
833 //
834 // Floats are treated differently from int regs: The first 13 float arguments
835 // are passed in registers (not the float args among the first 13 args).
836 // Thus argument i is NOT passed in farg_reg[i] if it is float. It is passed
837 // in farg_reg[j] if argument i is the j-th float argument of this call.
838 //
839 case T_FLOAT:
840 #if defined(LINUX)
841 // Linux uses ELF ABI. Both original ELF and ELFv2 ABIs have float
842 // in the least significant word of an argument slot.
843 #if defined(VM_LITTLE_ENDIAN)
844 #define FLOAT_WORD_OFFSET_IN_SLOT 0
845 #else
846 #define FLOAT_WORD_OFFSET_IN_SLOT 1
847 #endif
848 #elif defined(AIX)
849 // Although AIX runs on big endian CPU, float is in the most
850 // significant word of an argument slot.
851 #define FLOAT_WORD_OFFSET_IN_SLOT 0
852 #else
853 #error "unknown OS"
854 #endif
855 if (freg < Argument::n_float_register_parameters_c) {
856 // Put float in register ...
857 reg = farg_reg[freg];
858 ++freg;
859
860 // Argument i for i > 8 is placed on the stack even if it's
861 // placed in a register (if it's a float arg). Aix disassembly
862 // shows that xlC places these float args on the stack AND in
863 // a register. This is not documented, but we follow this
864 // convention, too.
865 if (arg >= Argument::n_regs_not_on_stack_c) {
866 // ... and on the stack.
867 guarantee(regs2 != NULL, "must pass float in register and stack slot");
868 VMReg reg2 = VMRegImpl::stack2reg(stk + FLOAT_WORD_OFFSET_IN_SLOT);
869 regs2[i].set1(reg2);
870 stk += inc_stk_for_intfloat;
871 }
872
873 } else {
874 // Put float on stack.
875 reg = VMRegImpl::stack2reg(stk + FLOAT_WORD_OFFSET_IN_SLOT);
876 stk += inc_stk_for_intfloat;
877 }
878 regs[i].set1(reg);
879 break;
880 case T_DOUBLE:
881 assert((i + 1) < total_args_passed && sig_bt[i+1] == T_VOID, "expecting half");
882 if (freg < Argument::n_float_register_parameters_c) {
883 // Put double in register ...
884 reg = farg_reg[freg];
885 ++freg;
886
887 // Argument i for i > 8 is placed on the stack even if it's
888 // placed in a register (if it's a double arg). Aix disassembly
889 // shows that xlC places these float args on the stack AND in
890 // a register. This is not documented, but we follow this
891 // convention, too.
892 if (arg >= Argument::n_regs_not_on_stack_c) {
893 // ... and on the stack.
894 guarantee(regs2 != NULL, "must pass float in register and stack slot");
895 VMReg reg2 = VMRegImpl::stack2reg(stk);
896 regs2[i].set2(reg2);
897 stk += inc_stk_for_longdouble;
898 }
899 } else {
900 // Put double on stack.
901 reg = VMRegImpl::stack2reg(stk);
902 stk += inc_stk_for_longdouble;
903 }
904 regs[i].set2(reg);
905 break;
906
907 case T_VOID:
908 // Do not count halves.
909 regs[i].set_bad();
910 --arg;
911 break;
912 default:
913 ShouldNotReachHere();
914 }
915 }
916
917 return align_up(stk, 2);
918 }
919 #endif // COMPILER2
920
921 int SharedRuntime::vector_calling_convention(VMRegPair *regs,
922 uint num_bits,
923 uint total_args_passed) {
924 Unimplemented();
925 return 0;
926 }
927
928 static address gen_c2i_adapter(MacroAssembler *masm,
929 int total_args_passed,
930 int comp_args_on_stack,
931 const BasicType *sig_bt,
932 const VMRegPair *regs,
933 Label& call_interpreter,
934 const Register& ientry) {
935
936 address c2i_entrypoint;
937
938 const Register sender_SP = R21_sender_SP; // == R21_tmp1
939 const Register code = R22_tmp2;
940 //const Register ientry = R23_tmp3;
941 const Register value_regs[] = { R24_tmp4, R25_tmp5, R26_tmp6 };
942 const int num_value_regs = sizeof(value_regs) / sizeof(Register);
943 int value_regs_index = 0;
944
945 const Register return_pc = R27_tmp7;
946 const Register tmp = R28_tmp8;
947
948 assert_different_registers(sender_SP, code, ientry, return_pc, tmp);
949
950 // Adapter needs TOP_IJAVA_FRAME_ABI.
951 const int adapter_size = frame::top_ijava_frame_abi_size +
952 align_up(total_args_passed * wordSize, frame::alignment_in_bytes);
953
954 // regular (verified) c2i entry point
955 c2i_entrypoint = __ pc();
956
957 // Does compiled code exists? If yes, patch the caller's callsite.
958 __ ld(code, method_(code));
959 __ cmpdi(CCR0, code, 0);
960 __ ld(ientry, method_(interpreter_entry)); // preloaded
961 __ beq(CCR0, call_interpreter);
962
963
964 // Patch caller's callsite, method_(code) was not NULL which means that
965 // compiled code exists.
966 __ mflr(return_pc);
967 __ std(return_pc, _abi0(lr), R1_SP);
968 RegisterSaver::push_frame_and_save_argument_registers(masm, tmp, adapter_size, total_args_passed, regs);
969
970 __ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::fixup_callers_callsite), R19_method, return_pc);
971
972 RegisterSaver::restore_argument_registers_and_pop_frame(masm, adapter_size, total_args_passed, regs);
973 __ ld(return_pc, _abi0(lr), R1_SP);
974 __ ld(ientry, method_(interpreter_entry)); // preloaded
975 __ mtlr(return_pc);
976
977
978 // Call the interpreter.
979 __ BIND(call_interpreter);
980 __ mtctr(ientry);
981
982 // Get a copy of the current SP for loading caller's arguments.
983 __ mr(sender_SP, R1_SP);
984
985 // Add space for the adapter.
986 __ resize_frame(-adapter_size, R12_scratch2);
987
988 int st_off = adapter_size - wordSize;
989
990 // Write the args into the outgoing interpreter space.
991 for (int i = 0; i < total_args_passed; i++) {
992 VMReg r_1 = regs[i].first();
993 VMReg r_2 = regs[i].second();
994 if (!r_1->is_valid()) {
995 assert(!r_2->is_valid(), "");
996 continue;
997 }
998 if (r_1->is_stack()) {
999 Register tmp_reg = value_regs[value_regs_index];
1000 value_regs_index = (value_regs_index + 1) % num_value_regs;
1001 // The calling convention produces OptoRegs that ignore the out
1002 // preserve area (JIT's ABI). We must account for it here.
1003 int ld_off = (r_1->reg2stack() + SharedRuntime::out_preserve_stack_slots()) * VMRegImpl::stack_slot_size;
1004 if (!r_2->is_valid()) {
1005 __ lwz(tmp_reg, ld_off, sender_SP);
1006 } else {
1007 __ ld(tmp_reg, ld_off, sender_SP);
1008 }
1009 // Pretend stack targets were loaded into tmp_reg.
1010 r_1 = tmp_reg->as_VMReg();
1011 }
1012
1013 if (r_1->is_Register()) {
1014 Register r = r_1->as_Register();
1015 if (!r_2->is_valid()) {
1016 __ stw(r, st_off, R1_SP);
1017 st_off-=wordSize;
1018 } else {
1019 // Longs are given 2 64-bit slots in the interpreter, but the
1020 // data is passed in only 1 slot.
1021 if (sig_bt[i] == T_LONG || sig_bt[i] == T_DOUBLE) {
1022 DEBUG_ONLY( __ li(tmp, 0); __ std(tmp, st_off, R1_SP); )
1023 st_off-=wordSize;
1024 }
1025 __ std(r, st_off, R1_SP);
1026 st_off-=wordSize;
1027 }
1028 } else {
1029 assert(r_1->is_FloatRegister(), "");
1030 FloatRegister f = r_1->as_FloatRegister();
1031 if (!r_2->is_valid()) {
1032 __ stfs(f, st_off, R1_SP);
1033 st_off-=wordSize;
1034 } else {
1035 // In 64bit, doubles are given 2 64-bit slots in the interpreter, but the
1036 // data is passed in only 1 slot.
1037 // One of these should get known junk...
1038 DEBUG_ONLY( __ li(tmp, 0); __ std(tmp, st_off, R1_SP); )
1039 st_off-=wordSize;
1040 __ stfd(f, st_off, R1_SP);
1041 st_off-=wordSize;
1042 }
1043 }
1044 }
1045
1046 // Jump to the interpreter just as if interpreter was doing it.
1047
1048 __ load_const_optimized(R25_templateTableBase, (address)Interpreter::dispatch_table((TosState)0), R11_scratch1);
1049
1050 // load TOS
1051 __ addi(R15_esp, R1_SP, st_off);
1052
1053 // Frame_manager expects initial_caller_sp (= SP without resize by c2i) in R21_tmp1.
1054 assert(sender_SP == R21_sender_SP, "passing initial caller's SP in wrong register");
1055 __ bctr();
1056
1057 return c2i_entrypoint;
1058 }
1059
1060 void SharedRuntime::gen_i2c_adapter(MacroAssembler *masm,
1061 int total_args_passed,
1062 int comp_args_on_stack,
1063 const BasicType *sig_bt,
1064 const VMRegPair *regs) {
1065
1066 // Load method's entry-point from method.
1067 __ ld(R12_scratch2, in_bytes(Method::from_compiled_offset()), R19_method);
1068 __ mtctr(R12_scratch2);
1069
1070 // We will only enter here from an interpreted frame and never from after
1071 // passing thru a c2i. Azul allowed this but we do not. If we lose the
1072 // race and use a c2i we will remain interpreted for the race loser(s).
1073 // This removes all sorts of headaches on the x86 side and also eliminates
1074 // the possibility of having c2i -> i2c -> c2i -> ... endless transitions.
1075
1076 // Note: r13 contains the senderSP on entry. We must preserve it since
1077 // we may do a i2c -> c2i transition if we lose a race where compiled
1078 // code goes non-entrant while we get args ready.
1079 // In addition we use r13 to locate all the interpreter args as
1080 // we must align the stack to 16 bytes on an i2c entry else we
1081 // lose alignment we expect in all compiled code and register
1082 // save code can segv when fxsave instructions find improperly
1083 // aligned stack pointer.
1084
1085 const Register ld_ptr = R15_esp;
1086 const Register value_regs[] = { R22_tmp2, R23_tmp3, R24_tmp4, R25_tmp5, R26_tmp6 };
1087 const int num_value_regs = sizeof(value_regs) / sizeof(Register);
1088 int value_regs_index = 0;
1089
1090 int ld_offset = total_args_passed*wordSize;
1091
1092 // Cut-out for having no stack args. Since up to 2 int/oop args are passed
1093 // in registers, we will occasionally have no stack args.
1094 int comp_words_on_stack = 0;
1095 if (comp_args_on_stack) {
1096 // Sig words on the stack are greater-than VMRegImpl::stack0. Those in
1097 // registers are below. By subtracting stack0, we either get a negative
1098 // number (all values in registers) or the maximum stack slot accessed.
1099
1100 // Convert 4-byte c2 stack slots to words.
1101 comp_words_on_stack = align_up(comp_args_on_stack*VMRegImpl::stack_slot_size, wordSize)>>LogBytesPerWord;
1102 // Round up to miminum stack alignment, in wordSize.
1103 comp_words_on_stack = align_up(comp_words_on_stack, 2);
1104 __ resize_frame(-comp_words_on_stack * wordSize, R11_scratch1);
1105 }
1106
1107 // Now generate the shuffle code. Pick up all register args and move the
1108 // rest through register value=Z_R12.
1109 BLOCK_COMMENT("Shuffle arguments");
1110 for (int i = 0; i < total_args_passed; i++) {
1111 if (sig_bt[i] == T_VOID) {
1112 assert(i > 0 && (sig_bt[i-1] == T_LONG || sig_bt[i-1] == T_DOUBLE), "missing half");
1113 continue;
1114 }
1115
1116 // Pick up 0, 1 or 2 words from ld_ptr.
1117 assert(!regs[i].second()->is_valid() || regs[i].first()->next() == regs[i].second(),
1118 "scrambled load targets?");
1119 VMReg r_1 = regs[i].first();
1120 VMReg r_2 = regs[i].second();
1121 if (!r_1->is_valid()) {
1122 assert(!r_2->is_valid(), "");
1123 continue;
1124 }
1125 if (r_1->is_FloatRegister()) {
1126 if (!r_2->is_valid()) {
1127 __ lfs(r_1->as_FloatRegister(), ld_offset, ld_ptr);
1128 ld_offset-=wordSize;
1129 } else {
1130 // Skip the unused interpreter slot.
1131 __ lfd(r_1->as_FloatRegister(), ld_offset-wordSize, ld_ptr);
1132 ld_offset-=2*wordSize;
1133 }
1134 } else {
1135 Register r;
1136 if (r_1->is_stack()) {
1137 // Must do a memory to memory move thru "value".
1138 r = value_regs[value_regs_index];
1139 value_regs_index = (value_regs_index + 1) % num_value_regs;
1140 } else {
1141 r = r_1->as_Register();
1142 }
1143 if (!r_2->is_valid()) {
1144 // Not sure we need to do this but it shouldn't hurt.
1145 if (is_reference_type(sig_bt[i]) || sig_bt[i] == T_ADDRESS) {
1146 __ ld(r, ld_offset, ld_ptr);
1147 ld_offset-=wordSize;
1148 } else {
1149 __ lwz(r, ld_offset, ld_ptr);
1150 ld_offset-=wordSize;
1151 }
1152 } else {
1153 // In 64bit, longs are given 2 64-bit slots in the interpreter, but the
1154 // data is passed in only 1 slot.
1155 if (sig_bt[i] == T_LONG || sig_bt[i] == T_DOUBLE) {
1156 ld_offset-=wordSize;
1157 }
1158 __ ld(r, ld_offset, ld_ptr);
1159 ld_offset-=wordSize;
1160 }
1161
1162 if (r_1->is_stack()) {
1163 // Now store value where the compiler expects it
1164 int st_off = (r_1->reg2stack() + SharedRuntime::out_preserve_stack_slots())*VMRegImpl::stack_slot_size;
1165
1166 if (sig_bt[i] == T_INT || sig_bt[i] == T_FLOAT ||sig_bt[i] == T_BOOLEAN ||
1167 sig_bt[i] == T_SHORT || sig_bt[i] == T_CHAR || sig_bt[i] == T_BYTE) {
1168 __ stw(r, st_off, R1_SP);
1169 } else {
1170 __ std(r, st_off, R1_SP);
1171 }
1172 }
1173 }
1174 }
1175
1176 BLOCK_COMMENT("Store method");
1177 // Store method into thread->callee_target.
1178 // We might end up in handle_wrong_method if the callee is
1179 // deoptimized as we race thru here. If that happens we don't want
1180 // to take a safepoint because the caller frame will look
1181 // interpreted and arguments are now "compiled" so it is much better
1182 // to make this transition invisible to the stack walking
1183 // code. Unfortunately if we try and find the callee by normal means
1184 // a safepoint is possible. So we stash the desired callee in the
1185 // thread and the vm will find there should this case occur.
1186 __ std(R19_method, thread_(callee_target));
1187
1188 // Jump to the compiled code just as if compiled code was doing it.
1189 __ bctr();
1190 }
1191
1192 AdapterHandlerEntry* SharedRuntime::generate_i2c2i_adapters(MacroAssembler *masm,
1193 int total_args_passed,
1194 int comp_args_on_stack,
1195 const BasicType *sig_bt,
1196 const VMRegPair *regs,
1197 AdapterFingerPrint* fingerprint) {
1198 address i2c_entry;
1199 address c2i_unverified_entry;
1200 address c2i_entry;
1201
1202
1203 // entry: i2c
1204
1205 __ align(CodeEntryAlignment);
1206 i2c_entry = __ pc();
1207 gen_i2c_adapter(masm, total_args_passed, comp_args_on_stack, sig_bt, regs);
1208
1209
1210 // entry: c2i unverified
1211
1212 __ align(CodeEntryAlignment);
1213 BLOCK_COMMENT("c2i unverified entry");
1214 c2i_unverified_entry = __ pc();
1215
1216 // inline_cache contains a compiledICHolder
1217 const Register ic = R19_method;
1218 const Register ic_klass = R11_scratch1;
1219 const Register receiver_klass = R12_scratch2;
1220 const Register code = R21_tmp1;
1221 const Register ientry = R23_tmp3;
1222
1223 assert_different_registers(ic, ic_klass, receiver_klass, R3_ARG1, code, ientry);
1224 assert(R11_scratch1 == R11, "need prologue scratch register");
1225
1226 Label call_interpreter;
1227
1228 assert(!MacroAssembler::needs_explicit_null_check(oopDesc::klass_offset_in_bytes()),
1229 "klass offset should reach into any page");
1230 // Check for NULL argument if we don't have implicit null checks.
1231 if (!ImplicitNullChecks || !os::zero_page_read_protected()) {
1232 if (TrapBasedNullChecks) {
1233 __ trap_null_check(R3_ARG1);
1234 } else {
1235 Label valid;
1236 __ cmpdi(CCR0, R3_ARG1, 0);
1237 __ bne_predict_taken(CCR0, valid);
1238 // We have a null argument, branch to ic_miss_stub.
1239 __ b64_patchable((address)SharedRuntime::get_ic_miss_stub(),
1240 relocInfo::runtime_call_type);
1241 __ BIND(valid);
1242 }
1243 }
1244 // Assume argument is not NULL, load klass from receiver.
1245 __ load_klass(receiver_klass, R3_ARG1);
1246
1247 __ ld(ic_klass, CompiledICHolder::holder_klass_offset(), ic);
1248
1249 if (TrapBasedICMissChecks) {
1250 __ trap_ic_miss_check(receiver_klass, ic_klass);
1251 } else {
1252 Label valid;
1253 __ cmpd(CCR0, receiver_klass, ic_klass);
1254 __ beq_predict_taken(CCR0, valid);
1255 // We have an unexpected klass, branch to ic_miss_stub.
1256 __ b64_patchable((address)SharedRuntime::get_ic_miss_stub(),
1257 relocInfo::runtime_call_type);
1258 __ BIND(valid);
1259 }
1260
1261 // Argument is valid and klass is as expected, continue.
1262
1263 // Extract method from inline cache, verified entry point needs it.
1264 __ ld(R19_method, CompiledICHolder::holder_metadata_offset(), ic);
1265 assert(R19_method == ic, "the inline cache register is dead here");
1266
1267 __ ld(code, method_(code));
1268 __ cmpdi(CCR0, code, 0);
1269 __ ld(ientry, method_(interpreter_entry)); // preloaded
1270 __ beq_predict_taken(CCR0, call_interpreter);
1271
1272 // Branch to ic_miss_stub.
1273 __ b64_patchable((address)SharedRuntime::get_ic_miss_stub(), relocInfo::runtime_call_type);
1274
1275 // entry: c2i
1276
1277 c2i_entry = __ pc();
1278
1279 // Class initialization barrier for static methods
1280 address c2i_no_clinit_check_entry = NULL;
1281 if (VM_Version::supports_fast_class_init_checks()) {
1282 Label L_skip_barrier;
1283
1284 { // Bypass the barrier for non-static methods
1285 __ lwz(R0, in_bytes(Method::access_flags_offset()), R19_method);
1286 __ andi_(R0, R0, JVM_ACC_STATIC);
1287 __ beq(CCR0, L_skip_barrier); // non-static
1288 }
1289
1290 Register klass = R11_scratch1;
1291 __ load_method_holder(klass, R19_method);
1292 __ clinit_barrier(klass, R16_thread, &L_skip_barrier /*L_fast_path*/);
1293
1294 __ load_const_optimized(klass, SharedRuntime::get_handle_wrong_method_stub(), R0);
1295 __ mtctr(klass);
1296 __ bctr();
1297
1298 __ bind(L_skip_barrier);
1299 c2i_no_clinit_check_entry = __ pc();
1300 }
1301
1302 BarrierSetAssembler* bs = BarrierSet::barrier_set()->barrier_set_assembler();
1303 bs->c2i_entry_barrier(masm, /* tmp register*/ ic_klass, /* tmp register*/ receiver_klass, /* tmp register*/ code);
1304
1305 gen_c2i_adapter(masm, total_args_passed, comp_args_on_stack, sig_bt, regs, call_interpreter, ientry);
1306
1307 return AdapterHandlerLibrary::new_entry(fingerprint, i2c_entry, c2i_entry, c2i_unverified_entry,
1308 c2i_no_clinit_check_entry);
1309 }
1310
1311 // An oop arg. Must pass a handle not the oop itself.
1312 static void object_move(MacroAssembler* masm,
1313 int frame_size_in_slots,
1314 OopMap* oop_map, int oop_handle_offset,
1315 bool is_receiver, int* receiver_offset,
1316 VMRegPair src, VMRegPair dst,
1317 Register r_caller_sp, Register r_temp_1, Register r_temp_2) {
1318 assert(!is_receiver || (is_receiver && (*receiver_offset == -1)),
1319 "receiver has already been moved");
1320
1321 // We must pass a handle. First figure out the location we use as a handle.
1322
1323 if (src.first()->is_stack()) {
1324 // stack to stack or reg
1325
1326 const Register r_handle = dst.first()->is_stack() ? r_temp_1 : dst.first()->as_Register();
1327 Label skip;
1328 const int oop_slot_in_callers_frame = reg2slot(src.first());
1329
1330 guarantee(!is_receiver, "expecting receiver in register");
1331 oop_map->set_oop(VMRegImpl::stack2reg(oop_slot_in_callers_frame + frame_size_in_slots));
1332
1333 __ addi(r_handle, r_caller_sp, reg2offset(src.first()));
1334 __ ld( r_temp_2, reg2offset(src.first()), r_caller_sp);
1335 __ cmpdi(CCR0, r_temp_2, 0);
1336 __ bne(CCR0, skip);
1337 // Use a NULL handle if oop is NULL.
1338 __ li(r_handle, 0);
1339 __ bind(skip);
1340
1341 if (dst.first()->is_stack()) {
1342 // stack to stack
1343 __ std(r_handle, reg2offset(dst.first()), R1_SP);
1344 } else {
1345 // stack to reg
1346 // Nothing to do, r_handle is already the dst register.
1347 }
1348 } else {
1349 // reg to stack or reg
1350 const Register r_oop = src.first()->as_Register();
1351 const Register r_handle = dst.first()->is_stack() ? r_temp_1 : dst.first()->as_Register();
1352 const int oop_slot = (r_oop->encoding()-R3_ARG1->encoding()) * VMRegImpl::slots_per_word
1353 + oop_handle_offset; // in slots
1354 const int oop_offset = oop_slot * VMRegImpl::stack_slot_size;
1355 Label skip;
1356
1357 if (is_receiver) {
1358 *receiver_offset = oop_offset;
1359 }
1360 oop_map->set_oop(VMRegImpl::stack2reg(oop_slot));
1361
1362 __ std( r_oop, oop_offset, R1_SP);
1363 __ addi(r_handle, R1_SP, oop_offset);
1364
1365 __ cmpdi(CCR0, r_oop, 0);
1366 __ bne(CCR0, skip);
1367 // Use a NULL handle if oop is NULL.
1368 __ li(r_handle, 0);
1369 __ bind(skip);
1370
1371 if (dst.first()->is_stack()) {
1372 // reg to stack
1373 __ std(r_handle, reg2offset(dst.first()), R1_SP);
1374 } else {
1375 // reg to reg
1376 // Nothing to do, r_handle is already the dst register.
1377 }
1378 }
1379 }
1380
1381 static void int_move(MacroAssembler*masm,
1382 VMRegPair src, VMRegPair dst,
1383 Register r_caller_sp, Register r_temp) {
1384 assert(src.first()->is_valid(), "incoming must be int");
1385 assert(dst.first()->is_valid() && dst.second() == dst.first()->next(), "outgoing must be long");
1386
1387 if (src.first()->is_stack()) {
1388 if (dst.first()->is_stack()) {
1389 // stack to stack
1390 __ lwa(r_temp, reg2offset(src.first()), r_caller_sp);
1391 __ std(r_temp, reg2offset(dst.first()), R1_SP);
1392 } else {
1393 // stack to reg
1394 __ lwa(dst.first()->as_Register(), reg2offset(src.first()), r_caller_sp);
1395 }
1396 } else if (dst.first()->is_stack()) {
1397 // reg to stack
1398 __ extsw(r_temp, src.first()->as_Register());
1399 __ std(r_temp, reg2offset(dst.first()), R1_SP);
1400 } else {
1401 // reg to reg
1402 __ extsw(dst.first()->as_Register(), src.first()->as_Register());
1403 }
1404 }
1405
1406 static void long_move(MacroAssembler*masm,
1407 VMRegPair src, VMRegPair dst,
1408 Register r_caller_sp, Register r_temp) {
1409 assert(src.first()->is_valid() && src.second() == src.first()->next(), "incoming must be long");
1410 assert(dst.first()->is_valid() && dst.second() == dst.first()->next(), "outgoing must be long");
1411
1412 if (src.first()->is_stack()) {
1413 if (dst.first()->is_stack()) {
1414 // stack to stack
1415 __ ld( r_temp, reg2offset(src.first()), r_caller_sp);
1416 __ std(r_temp, reg2offset(dst.first()), R1_SP);
1417 } else {
1418 // stack to reg
1419 __ ld(dst.first()->as_Register(), reg2offset(src.first()), r_caller_sp);
1420 }
1421 } else if (dst.first()->is_stack()) {
1422 // reg to stack
1423 __ std(src.first()->as_Register(), reg2offset(dst.first()), R1_SP);
1424 } else {
1425 // reg to reg
1426 if (dst.first()->as_Register() != src.first()->as_Register())
1427 __ mr(dst.first()->as_Register(), src.first()->as_Register());
1428 }
1429 }
1430
1431 static void float_move(MacroAssembler*masm,
1432 VMRegPair src, VMRegPair dst,
1433 Register r_caller_sp, Register r_temp) {
1434 assert(src.first()->is_valid() && !src.second()->is_valid(), "incoming must be float");
1435 assert(dst.first()->is_valid() && !dst.second()->is_valid(), "outgoing must be float");
1436
1437 if (src.first()->is_stack()) {
1438 if (dst.first()->is_stack()) {
1439 // stack to stack
1440 __ lwz(r_temp, reg2offset(src.first()), r_caller_sp);
1441 __ stw(r_temp, reg2offset(dst.first()), R1_SP);
1442 } else {
1443 // stack to reg
1444 __ lfs(dst.first()->as_FloatRegister(), reg2offset(src.first()), r_caller_sp);
1445 }
1446 } else if (dst.first()->is_stack()) {
1447 // reg to stack
1448 __ stfs(src.first()->as_FloatRegister(), reg2offset(dst.first()), R1_SP);
1449 } else {
1450 // reg to reg
1451 if (dst.first()->as_FloatRegister() != src.first()->as_FloatRegister())
1452 __ fmr(dst.first()->as_FloatRegister(), src.first()->as_FloatRegister());
1453 }
1454 }
1455
1456 static void double_move(MacroAssembler*masm,
1457 VMRegPair src, VMRegPair dst,
1458 Register r_caller_sp, Register r_temp) {
1459 assert(src.first()->is_valid() && src.second() == src.first()->next(), "incoming must be double");
1460 assert(dst.first()->is_valid() && dst.second() == dst.first()->next(), "outgoing must be double");
1461
1462 if (src.first()->is_stack()) {
1463 if (dst.first()->is_stack()) {
1464 // stack to stack
1465 __ ld( r_temp, reg2offset(src.first()), r_caller_sp);
1466 __ std(r_temp, reg2offset(dst.first()), R1_SP);
1467 } else {
1468 // stack to reg
1469 __ lfd(dst.first()->as_FloatRegister(), reg2offset(src.first()), r_caller_sp);
1470 }
1471 } else if (dst.first()->is_stack()) {
1472 // reg to stack
1473 __ stfd(src.first()->as_FloatRegister(), reg2offset(dst.first()), R1_SP);
1474 } else {
1475 // reg to reg
1476 if (dst.first()->as_FloatRegister() != src.first()->as_FloatRegister())
1477 __ fmr(dst.first()->as_FloatRegister(), src.first()->as_FloatRegister());
1478 }
1479 }
1480
1481 void SharedRuntime::save_native_result(MacroAssembler *masm, BasicType ret_type, int frame_slots) {
1482 switch (ret_type) {
1483 case T_BOOLEAN:
1484 case T_CHAR:
1485 case T_BYTE:
1486 case T_SHORT:
1487 case T_INT:
1488 __ stw (R3_RET, frame_slots*VMRegImpl::stack_slot_size, R1_SP);
1489 break;
1490 case T_ARRAY:
1491 case T_OBJECT:
1492 case T_LONG:
1493 __ std (R3_RET, frame_slots*VMRegImpl::stack_slot_size, R1_SP);
1494 break;
1495 case T_FLOAT:
1496 __ stfs(F1_RET, frame_slots*VMRegImpl::stack_slot_size, R1_SP);
1497 break;
1498 case T_DOUBLE:
1499 __ stfd(F1_RET, frame_slots*VMRegImpl::stack_slot_size, R1_SP);
1500 break;
1501 case T_VOID:
1502 break;
1503 default:
1504 ShouldNotReachHere();
1505 break;
1506 }
1507 }
1508
1509 void SharedRuntime::restore_native_result(MacroAssembler *masm, BasicType ret_type, int frame_slots) {
1510 switch (ret_type) {
1511 case T_BOOLEAN:
1512 case T_CHAR:
1513 case T_BYTE:
1514 case T_SHORT:
1515 case T_INT:
1516 __ lwz(R3_RET, frame_slots*VMRegImpl::stack_slot_size, R1_SP);
1517 break;
1518 case T_ARRAY:
1519 case T_OBJECT:
1520 case T_LONG:
1521 __ ld (R3_RET, frame_slots*VMRegImpl::stack_slot_size, R1_SP);
1522 break;
1523 case T_FLOAT:
1524 __ lfs(F1_RET, frame_slots*VMRegImpl::stack_slot_size, R1_SP);
1525 break;
1526 case T_DOUBLE:
1527 __ lfd(F1_RET, frame_slots*VMRegImpl::stack_slot_size, R1_SP);
1528 break;
1529 case T_VOID:
1530 break;
1531 default:
1532 ShouldNotReachHere();
1533 break;
1534 }
1535 }
1536
1537 static void verify_oop_args(MacroAssembler* masm,
1538 const methodHandle& method,
1539 const BasicType* sig_bt,
1540 const VMRegPair* regs) {
1541 Register temp_reg = R19_method; // not part of any compiled calling seq
1542 if (VerifyOops) {
1543 for (int i = 0; i < method->size_of_parameters(); i++) {
1544 if (is_reference_type(sig_bt[i])) {
1545 VMReg r = regs[i].first();
1546 assert(r->is_valid(), "bad oop arg");
1547 if (r->is_stack()) {
1548 __ ld(temp_reg, reg2offset(r), R1_SP);
1549 __ verify_oop(temp_reg, FILE_AND_LINE);
1550 } else {
1551 __ verify_oop(r->as_Register(), FILE_AND_LINE);
1552 }
1553 }
1554 }
1555 }
1556 }
1557
1558 static void gen_special_dispatch(MacroAssembler* masm,
1559 const methodHandle& method,
1560 const BasicType* sig_bt,
1561 const VMRegPair* regs) {
1562 verify_oop_args(masm, method, sig_bt, regs);
1563 vmIntrinsics::ID iid = method->intrinsic_id();
1564
1565 // Now write the args into the outgoing interpreter space
1566 bool has_receiver = false;
1567 Register receiver_reg = noreg;
1568 int member_arg_pos = -1;
1569 Register member_reg = noreg;
1570 int ref_kind = MethodHandles::signature_polymorphic_intrinsic_ref_kind(iid);
1571 if (ref_kind != 0) {
1572 member_arg_pos = method->size_of_parameters() - 1; // trailing MemberName argument
1573 member_reg = R19_method; // known to be free at this point
1574 has_receiver = MethodHandles::ref_kind_has_receiver(ref_kind);
1575 } else if (iid == vmIntrinsics::_invokeBasic || iid == vmIntrinsics::_linkToNative) {
1576 has_receiver = true;
1577 } else {
1578 fatal("unexpected intrinsic id %d", vmIntrinsics::as_int(iid));
1579 }
1580
1581 if (member_reg != noreg) {
1582 // Load the member_arg into register, if necessary.
1583 SharedRuntime::check_member_name_argument_is_last_argument(method, sig_bt, regs);
1584 VMReg r = regs[member_arg_pos].first();
1585 if (r->is_stack()) {
1586 __ ld(member_reg, reg2offset(r), R1_SP);
1587 } else {
1588 // no data motion is needed
1589 member_reg = r->as_Register();
1590 }
1591 }
1592
1593 if (has_receiver) {
1594 // Make sure the receiver is loaded into a register.
1595 assert(method->size_of_parameters() > 0, "oob");
1596 assert(sig_bt[0] == T_OBJECT, "receiver argument must be an object");
1597 VMReg r = regs[0].first();
1598 assert(r->is_valid(), "bad receiver arg");
1599 if (r->is_stack()) {
1600 // Porting note: This assumes that compiled calling conventions always
1601 // pass the receiver oop in a register. If this is not true on some
1602 // platform, pick a temp and load the receiver from stack.
1603 fatal("receiver always in a register");
1604 receiver_reg = R11_scratch1; // TODO (hs24): is R11_scratch1 really free at this point?
1605 __ ld(receiver_reg, reg2offset(r), R1_SP);
1606 } else {
1607 // no data motion is needed
1608 receiver_reg = r->as_Register();
1609 }
1610 }
1611
1612 // Figure out which address we are really jumping to:
1613 MethodHandles::generate_method_handle_dispatch(masm, iid,
1614 receiver_reg, member_reg, /*for_compiler_entry:*/ true);
1615 }
1616
1617 // ---------------------------------------------------------------------------
1618 // Generate a native wrapper for a given method. The method takes arguments
1619 // in the Java compiled code convention, marshals them to the native
1620 // convention (handlizes oops, etc), transitions to native, makes the call,
1621 // returns to java state (possibly blocking), unhandlizes any result and
1622 // returns.
1623 //
1624 // Critical native functions are a shorthand for the use of
1625 // GetPrimtiveArrayCritical and disallow the use of any other JNI
1626 // functions. The wrapper is expected to unpack the arguments before
1627 // passing them to the callee. Critical native functions leave the state _in_Java,
1628 // since they cannot stop for GC.
1629 // Some other parts of JNI setup are skipped like the tear down of the JNI handle
1630 // block and the check for pending exceptions it's impossible for them
1631 // to be thrown.
1632 //
1633 nmethod *SharedRuntime::generate_native_wrapper(MacroAssembler *masm,
1634 const methodHandle& method,
1635 int compile_id,
1636 BasicType *in_sig_bt,
1637 VMRegPair *in_regs,
1638 BasicType ret_type) {
1639 if (method->is_method_handle_intrinsic()) {
1640 vmIntrinsics::ID iid = method->intrinsic_id();
1641 intptr_t start = (intptr_t)__ pc();
1642 int vep_offset = ((intptr_t)__ pc()) - start;
1643 gen_special_dispatch(masm,
1644 method,
1645 in_sig_bt,
1646 in_regs);
1647 int frame_complete = ((intptr_t)__ pc()) - start; // not complete, period
1648 __ flush();
1649 int stack_slots = SharedRuntime::out_preserve_stack_slots(); // no out slots at all, actually
1650 return nmethod::new_native_nmethod(method,
1651 compile_id,
1652 masm->code(),
1653 vep_offset,
1654 frame_complete,
1655 stack_slots / VMRegImpl::slots_per_word,
1656 in_ByteSize(-1),
1657 in_ByteSize(-1),
1658 (OopMapSet*)NULL);
1659 }
1660
1661 address native_func = method->native_function();
1662 assert(native_func != NULL, "must have function");
1663
1664 // First, create signature for outgoing C call
1665 // --------------------------------------------------------------------------
1666
1667 int total_in_args = method->size_of_parameters();
1668 // We have received a description of where all the java args are located
1669 // on entry to the wrapper. We need to convert these args to where
1670 // the jni function will expect them. To figure out where they go
1671 // we convert the java signature to a C signature by inserting
1672 // the hidden arguments as arg[0] and possibly arg[1] (static method)
1673
1674 // Calculate the total number of C arguments and create arrays for the
1675 // signature and the outgoing registers.
1676 // On ppc64, we have two arrays for the outgoing registers, because
1677 // some floating-point arguments must be passed in registers _and_
1678 // in stack locations.
1679 bool method_is_static = method->is_static();
1680 int total_c_args = total_in_args + (method_is_static ? 2 : 1);
1681
1682 BasicType *out_sig_bt = NEW_RESOURCE_ARRAY(BasicType, total_c_args);
1683 VMRegPair *out_regs = NEW_RESOURCE_ARRAY(VMRegPair, total_c_args);
1684 VMRegPair *out_regs2 = NEW_RESOURCE_ARRAY(VMRegPair, total_c_args);
1685 BasicType* in_elem_bt = NULL;
1686
1687 // Create the signature for the C call:
1688 // 1) add the JNIEnv*
1689 // 2) add the class if the method is static
1690 // 3) copy the rest of the incoming signature (shifted by the number of
1691 // hidden arguments).
1692
1693 int argc = 0;
1694 out_sig_bt[argc++] = T_ADDRESS;
1695 if (method->is_static()) {
1696 out_sig_bt[argc++] = T_OBJECT;
1697 }
1698
1699 for (int i = 0; i < total_in_args ; i++ ) {
1700 out_sig_bt[argc++] = in_sig_bt[i];
1701 }
1702
1703
1704 // Compute the wrapper's frame size.
1705 // --------------------------------------------------------------------------
1706
1707 // Now figure out where the args must be stored and how much stack space
1708 // they require.
1709 //
1710 // Compute framesize for the wrapper. We need to handlize all oops in
1711 // incoming registers.
1712 //
1713 // Calculate the total number of stack slots we will need:
1714 // 1) abi requirements
1715 // 2) outgoing arguments
1716 // 3) space for inbound oop handle area
1717 // 4) space for handlizing a klass if static method
1718 // 5) space for a lock if synchronized method
1719 // 6) workspace for saving return values, int <-> float reg moves, etc.
1720 // 7) alignment
1721 //
1722 // Layout of the native wrapper frame:
1723 // (stack grows upwards, memory grows downwards)
1724 //
1725 // NW [ABI_REG_ARGS] <-- 1) R1_SP
1726 // [outgoing arguments] <-- 2) R1_SP + out_arg_slot_offset
1727 // [oopHandle area] <-- 3) R1_SP + oop_handle_offset
1728 // klass <-- 4) R1_SP + klass_offset
1729 // lock <-- 5) R1_SP + lock_offset
1730 // [workspace] <-- 6) R1_SP + workspace_offset
1731 // [alignment] (optional) <-- 7)
1732 // caller [JIT_TOP_ABI_48] <-- r_callers_sp
1733 //
1734 // - *_slot_offset Indicates offset from SP in number of stack slots.
1735 // - *_offset Indicates offset from SP in bytes.
1736
1737 int stack_slots = c_calling_convention(out_sig_bt, out_regs, out_regs2, total_c_args) + // 1+2)
1738 SharedRuntime::out_preserve_stack_slots(); // See c_calling_convention.
1739
1740 // Now the space for the inbound oop handle area.
1741 int total_save_slots = num_java_iarg_registers * VMRegImpl::slots_per_word;
1742
1743 int oop_handle_slot_offset = stack_slots;
1744 stack_slots += total_save_slots; // 3)
1745
1746 int klass_slot_offset = 0;
1747 int klass_offset = -1;
1748 if (method_is_static) { // 4)
1749 klass_slot_offset = stack_slots;
1750 klass_offset = klass_slot_offset * VMRegImpl::stack_slot_size;
1751 stack_slots += VMRegImpl::slots_per_word;
1752 }
1753
1754 int lock_slot_offset = 0;
1755 int lock_offset = -1;
1756 if (method->is_synchronized()) { // 5)
1757 lock_slot_offset = stack_slots;
1758 lock_offset = lock_slot_offset * VMRegImpl::stack_slot_size;
1759 stack_slots += VMRegImpl::slots_per_word;
1760 }
1761
1762 int workspace_slot_offset = stack_slots; // 6)
1763 stack_slots += 2;
1764
1765 // Now compute actual number of stack words we need.
1766 // Rounding to make stack properly aligned.
1767 stack_slots = align_up(stack_slots, // 7)
1768 frame::alignment_in_bytes / VMRegImpl::stack_slot_size);
1769 int frame_size_in_bytes = stack_slots * VMRegImpl::stack_slot_size;
1770
1771
1772 // Now we can start generating code.
1773 // --------------------------------------------------------------------------
1774
1775 intptr_t start_pc = (intptr_t)__ pc();
1776 intptr_t vep_start_pc;
1777 intptr_t frame_done_pc;
1778 intptr_t oopmap_pc;
1779
1780 Label ic_miss;
1781 Label handle_pending_exception;
1782
1783 Register r_callers_sp = R21;
1784 Register r_temp_1 = R22;
1785 Register r_temp_2 = R23;
1786 Register r_temp_3 = R24;
1787 Register r_temp_4 = R25;
1788 Register r_temp_5 = R26;
1789 Register r_temp_6 = R27;
1790 Register r_return_pc = R28;
1791
1792 Register r_carg1_jnienv = noreg;
1793 Register r_carg2_classorobject = noreg;
1794 r_carg1_jnienv = out_regs[0].first()->as_Register();
1795 r_carg2_classorobject = out_regs[1].first()->as_Register();
1796
1797
1798 // Generate the Unverified Entry Point (UEP).
1799 // --------------------------------------------------------------------------
1800 assert(start_pc == (intptr_t)__ pc(), "uep must be at start");
1801
1802 // Check ic: object class == cached class?
1803 if (!method_is_static) {
1804 Register ic = R19_inline_cache_reg;
1805 Register receiver_klass = r_temp_1;
1806
1807 __ cmpdi(CCR0, R3_ARG1, 0);
1808 __ beq(CCR0, ic_miss);
1809 __ verify_oop(R3_ARG1, FILE_AND_LINE);
1810 __ load_klass(receiver_klass, R3_ARG1);
1811
1812 __ cmpd(CCR0, receiver_klass, ic);
1813 __ bne(CCR0, ic_miss);
1814 }
1815
1816
1817 // Generate the Verified Entry Point (VEP).
1818 // --------------------------------------------------------------------------
1819 vep_start_pc = (intptr_t)__ pc();
1820
1821 if (UseRTMLocking) {
1822 // Abort RTM transaction before calling JNI
1823 // because critical section can be large and
1824 // abort anyway. Also nmethod can be deoptimized.
1825 __ tabort_();
1826 }
1827
1828 if (VM_Version::supports_fast_class_init_checks() && method->needs_clinit_barrier()) {
1829 Label L_skip_barrier;
1830 Register klass = r_temp_1;
1831 // Notify OOP recorder (don't need the relocation)
1832 AddressLiteral md = __ constant_metadata_address(method->method_holder());
1833 __ load_const_optimized(klass, md.value(), R0);
1834 __ clinit_barrier(klass, R16_thread, &L_skip_barrier /*L_fast_path*/);
1835
1836 __ load_const_optimized(klass, SharedRuntime::get_handle_wrong_method_stub(), R0);
1837 __ mtctr(klass);
1838 __ bctr();
1839
1840 __ bind(L_skip_barrier);
1841 }
1842
1843 __ save_LR_CR(r_temp_1);
1844 __ generate_stack_overflow_check(frame_size_in_bytes); // Check before creating frame.
1845 __ mr(r_callers_sp, R1_SP); // Remember frame pointer.
1846 __ push_frame(frame_size_in_bytes, r_temp_1); // Push the c2n adapter's frame.
1847
1848 BarrierSetAssembler* bs = BarrierSet::barrier_set()->barrier_set_assembler();
1849 bs->nmethod_entry_barrier(masm, r_temp_1);
1850
1851 frame_done_pc = (intptr_t)__ pc();
1852
1853 __ verify_thread();
1854
1855 // Native nmethod wrappers never take possession of the oop arguments.
1856 // So the caller will gc the arguments.
1857 // The only thing we need an oopMap for is if the call is static.
1858 //
1859 // An OopMap for lock (and class if static), and one for the VM call itself.
1860 OopMapSet *oop_maps = new OopMapSet();
1861 OopMap *oop_map = new OopMap(stack_slots * 2, 0 /* arg_slots*/);
1862
1863 // Move arguments from register/stack to register/stack.
1864 // --------------------------------------------------------------------------
1865 //
1866 // We immediately shuffle the arguments so that for any vm call we have
1867 // to make from here on out (sync slow path, jvmti, etc.) we will have
1868 // captured the oops from our caller and have a valid oopMap for them.
1869 //
1870 // Natives require 1 or 2 extra arguments over the normal ones: the JNIEnv*
1871 // (derived from JavaThread* which is in R16_thread) and, if static,
1872 // the class mirror instead of a receiver. This pretty much guarantees that
1873 // register layout will not match. We ignore these extra arguments during
1874 // the shuffle. The shuffle is described by the two calling convention
1875 // vectors we have in our possession. We simply walk the java vector to
1876 // get the source locations and the c vector to get the destinations.
1877
1878 // Record sp-based slot for receiver on stack for non-static methods.
1879 int receiver_offset = -1;
1880
1881 // We move the arguments backward because the floating point registers
1882 // destination will always be to a register with a greater or equal
1883 // register number or the stack.
1884 // in is the index of the incoming Java arguments
1885 // out is the index of the outgoing C arguments
1886
1887 #ifdef ASSERT
1888 bool reg_destroyed[RegisterImpl::number_of_registers];
1889 bool freg_destroyed[FloatRegisterImpl::number_of_registers];
1890 for (int r = 0 ; r < RegisterImpl::number_of_registers ; r++) {
1891 reg_destroyed[r] = false;
1892 }
1893 for (int f = 0 ; f < FloatRegisterImpl::number_of_registers ; f++) {
1894 freg_destroyed[f] = false;
1895 }
1896 #endif // ASSERT
1897
1898 for (int in = total_in_args - 1, out = total_c_args - 1; in >= 0 ; in--, out--) {
1899
1900 #ifdef ASSERT
1901 if (in_regs[in].first()->is_Register()) {
1902 assert(!reg_destroyed[in_regs[in].first()->as_Register()->encoding()], "ack!");
1903 } else if (in_regs[in].first()->is_FloatRegister()) {
1904 assert(!freg_destroyed[in_regs[in].first()->as_FloatRegister()->encoding()], "ack!");
1905 }
1906 if (out_regs[out].first()->is_Register()) {
1907 reg_destroyed[out_regs[out].first()->as_Register()->encoding()] = true;
1908 } else if (out_regs[out].first()->is_FloatRegister()) {
1909 freg_destroyed[out_regs[out].first()->as_FloatRegister()->encoding()] = true;
1910 }
1911 if (out_regs2[out].first()->is_Register()) {
1912 reg_destroyed[out_regs2[out].first()->as_Register()->encoding()] = true;
1913 } else if (out_regs2[out].first()->is_FloatRegister()) {
1914 freg_destroyed[out_regs2[out].first()->as_FloatRegister()->encoding()] = true;
1915 }
1916 #endif // ASSERT
1917
1918 switch (in_sig_bt[in]) {
1919 case T_BOOLEAN:
1920 case T_CHAR:
1921 case T_BYTE:
1922 case T_SHORT:
1923 case T_INT:
1924 // Move int and do sign extension.
1925 int_move(masm, in_regs[in], out_regs[out], r_callers_sp, r_temp_1);
1926 break;
1927 case T_LONG:
1928 long_move(masm, in_regs[in], out_regs[out], r_callers_sp, r_temp_1);
1929 break;
1930 case T_ARRAY:
1931 case T_OBJECT:
1932 object_move(masm, stack_slots,
1933 oop_map, oop_handle_slot_offset,
1934 ((in == 0) && (!method_is_static)), &receiver_offset,
1935 in_regs[in], out_regs[out],
1936 r_callers_sp, r_temp_1, r_temp_2);
1937 break;
1938 case T_VOID:
1939 break;
1940 case T_FLOAT:
1941 float_move(masm, in_regs[in], out_regs[out], r_callers_sp, r_temp_1);
1942 if (out_regs2[out].first()->is_valid()) {
1943 float_move(masm, in_regs[in], out_regs2[out], r_callers_sp, r_temp_1);
1944 }
1945 break;
1946 case T_DOUBLE:
1947 double_move(masm, in_regs[in], out_regs[out], r_callers_sp, r_temp_1);
1948 if (out_regs2[out].first()->is_valid()) {
1949 double_move(masm, in_regs[in], out_regs2[out], r_callers_sp, r_temp_1);
1950 }
1951 break;
1952 case T_ADDRESS:
1953 fatal("found type (T_ADDRESS) in java args");
1954 break;
1955 default:
1956 ShouldNotReachHere();
1957 break;
1958 }
1959 }
1960
1961 // Pre-load a static method's oop into ARG2.
1962 // Used both by locking code and the normal JNI call code.
1963 if (method_is_static) {
1964 __ set_oop_constant(JNIHandles::make_local(method->method_holder()->java_mirror()),
1965 r_carg2_classorobject);
1966
1967 // Now handlize the static class mirror in carg2. It's known not-null.
1968 __ std(r_carg2_classorobject, klass_offset, R1_SP);
1969 oop_map->set_oop(VMRegImpl::stack2reg(klass_slot_offset));
1970 __ addi(r_carg2_classorobject, R1_SP, klass_offset);
1971 }
1972
1973 // Get JNIEnv* which is first argument to native.
1974 __ addi(r_carg1_jnienv, R16_thread, in_bytes(JavaThread::jni_environment_offset()));
1975
1976 // NOTE:
1977 //
1978 // We have all of the arguments setup at this point.
1979 // We MUST NOT touch any outgoing regs from this point on.
1980 // So if we must call out we must push a new frame.
1981
1982 // Get current pc for oopmap, and load it patchable relative to global toc.
1983 oopmap_pc = (intptr_t) __ pc();
1984 __ calculate_address_from_global_toc(r_return_pc, (address)oopmap_pc, true, true, true, true);
1985
1986 // We use the same pc/oopMap repeatedly when we call out.
1987 oop_maps->add_gc_map(oopmap_pc - start_pc, oop_map);
1988
1989 // r_return_pc now has the pc loaded that we will use when we finally call
1990 // to native.
1991
1992 // Make sure that thread is non-volatile; it crosses a bunch of VM calls below.
1993 assert(R16_thread->is_nonvolatile(), "thread must be in non-volatile register");
1994
1995 # if 0
1996 // DTrace method entry
1997 # endif
1998
1999 // Lock a synchronized method.
2000 // --------------------------------------------------------------------------
2001
2002 if (method->is_synchronized()) {
2003 ConditionRegister r_flag = CCR1;
2004 Register r_oop = r_temp_4;
2005 const Register r_box = r_temp_5;
2006 Label done, locked;
2007
2008 // Load the oop for the object or class. r_carg2_classorobject contains
2009 // either the handlized oop from the incoming arguments or the handlized
2010 // class mirror (if the method is static).
2011 __ ld(r_oop, 0, r_carg2_classorobject);
2012
2013 // Get the lock box slot's address.
2014 __ addi(r_box, R1_SP, lock_offset);
2015
2016 // Try fastpath for locking.
2017 // fast_lock kills r_temp_1, r_temp_2, r_temp_3.
2018 __ compiler_fast_lock_object(r_flag, r_oop, r_box, r_temp_1, r_temp_2, r_temp_3);
2019 __ beq(r_flag, locked);
2020
2021 // None of the above fast optimizations worked so we have to get into the
2022 // slow case of monitor enter. Inline a special case of call_VM that
2023 // disallows any pending_exception.
2024
2025 // Save argument registers and leave room for C-compatible ABI_REG_ARGS.
2026 int frame_size = frame::abi_reg_args_size + align_up(total_c_args * wordSize, frame::alignment_in_bytes);
2027 __ mr(R11_scratch1, R1_SP);
2028 RegisterSaver::push_frame_and_save_argument_registers(masm, R12_scratch2, frame_size, total_c_args, out_regs, out_regs2);
2029
2030 // Do the call.
2031 __ set_last_Java_frame(R11_scratch1, r_return_pc);
2032 assert(r_return_pc->is_nonvolatile(), "expecting return pc to be in non-volatile register");
2033 __ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::complete_monitor_locking_C), r_oop, r_box, R16_thread);
2034 __ reset_last_Java_frame();
2035
2036 RegisterSaver::restore_argument_registers_and_pop_frame(masm, frame_size, total_c_args, out_regs, out_regs2);
2037
2038 __ asm_assert_mem8_is_zero(thread_(pending_exception),
2039 "no pending exception allowed on exit from SharedRuntime::complete_monitor_locking_C");
2040
2041 __ bind(locked);
2042 }
2043
2044 // Use that pc we placed in r_return_pc a while back as the current frame anchor.
2045 __ set_last_Java_frame(R1_SP, r_return_pc);
2046
2047 // Publish thread state
2048 // --------------------------------------------------------------------------
2049
2050 // Transition from _thread_in_Java to _thread_in_native.
2051 __ li(R0, _thread_in_native);
2052 __ release();
2053 // TODO: PPC port assert(4 == JavaThread::sz_thread_state(), "unexpected field size");
2054 __ stw(R0, thread_(thread_state));
2055
2056
2057 // The JNI call
2058 // --------------------------------------------------------------------------
2059 #if defined(ABI_ELFv2)
2060 __ call_c(native_func, relocInfo::runtime_call_type);
2061 #else
2062 FunctionDescriptor* fd_native_method = (FunctionDescriptor*) native_func;
2063 __ call_c(fd_native_method, relocInfo::runtime_call_type);
2064 #endif
2065
2066
2067 // Now, we are back from the native code.
2068
2069
2070 // Unpack the native result.
2071 // --------------------------------------------------------------------------
2072
2073 // For int-types, we do any needed sign-extension required.
2074 // Care must be taken that the return values (R3_RET and F1_RET)
2075 // will survive any VM calls for blocking or unlocking.
2076 // An OOP result (handle) is done specially in the slow-path code.
2077
2078 switch (ret_type) {
2079 case T_VOID: break; // Nothing to do!
2080 case T_FLOAT: break; // Got it where we want it (unless slow-path).
2081 case T_DOUBLE: break; // Got it where we want it (unless slow-path).
2082 case T_LONG: break; // Got it where we want it (unless slow-path).
2083 case T_OBJECT: break; // Really a handle.
2084 // Cannot de-handlize until after reclaiming jvm_lock.
2085 case T_ARRAY: break;
2086
2087 case T_BOOLEAN: { // 0 -> false(0); !0 -> true(1)
2088 Label skip_modify;
2089 __ cmpwi(CCR0, R3_RET, 0);
2090 __ beq(CCR0, skip_modify);
2091 __ li(R3_RET, 1);
2092 __ bind(skip_modify);
2093 break;
2094 }
2095 case T_BYTE: { // sign extension
2096 __ extsb(R3_RET, R3_RET);
2097 break;
2098 }
2099 case T_CHAR: { // unsigned result
2100 __ andi(R3_RET, R3_RET, 0xffff);
2101 break;
2102 }
2103 case T_SHORT: { // sign extension
2104 __ extsh(R3_RET, R3_RET);
2105 break;
2106 }
2107 case T_INT: // nothing to do
2108 break;
2109 default:
2110 ShouldNotReachHere();
2111 break;
2112 }
2113
2114 Label after_transition;
2115
2116 // Publish thread state
2117 // --------------------------------------------------------------------------
2118
2119 // Switch thread to "native transition" state before reading the
2120 // synchronization state. This additional state is necessary because reading
2121 // and testing the synchronization state is not atomic w.r.t. GC, as this
2122 // scenario demonstrates:
2123 // - Java thread A, in _thread_in_native state, loads _not_synchronized
2124 // and is preempted.
2125 // - VM thread changes sync state to synchronizing and suspends threads
2126 // for GC.
2127 // - Thread A is resumed to finish this native method, but doesn't block
2128 // here since it didn't see any synchronization in progress, and escapes.
2129
2130 // Transition from _thread_in_native to _thread_in_native_trans.
2131 __ li(R0, _thread_in_native_trans);
2132 __ release();
2133 // TODO: PPC port assert(4 == JavaThread::sz_thread_state(), "unexpected field size");
2134 __ stw(R0, thread_(thread_state));
2135
2136
2137 // Must we block?
2138 // --------------------------------------------------------------------------
2139
2140 // Block, if necessary, before resuming in _thread_in_Java state.
2141 // In order for GC to work, don't clear the last_Java_sp until after blocking.
2142 {
2143 Label no_block, sync;
2144
2145 // Force this write out before the read below.
2146 __ fence();
2147
2148 Register sync_state_addr = r_temp_4;
2149 Register sync_state = r_temp_5;
2150 Register suspend_flags = r_temp_6;
2151
2152 // No synchronization in progress nor yet synchronized
2153 // (cmp-br-isync on one path, release (same as acquire on PPC64) on the other path).
2154 __ safepoint_poll(sync, sync_state, true /* at_return */, false /* in_nmethod */);
2155
2156 // Not suspended.
2157 // TODO: PPC port assert(4 == Thread::sz_suspend_flags(), "unexpected field size");
2158 __ lwz(suspend_flags, thread_(suspend_flags));
2159 __ cmpwi(CCR1, suspend_flags, 0);
2160 __ beq(CCR1, no_block);
2161
2162 // Block. Save any potential method result value before the operation and
2163 // use a leaf call to leave the last_Java_frame setup undisturbed. Doing this
2164 // lets us share the oopMap we used when we went native rather than create
2165 // a distinct one for this pc.
2166 __ bind(sync);
2167 __ isync();
2168
2169 address entry_point =
2170 CAST_FROM_FN_PTR(address, JavaThread::check_special_condition_for_native_trans);
2171 save_native_result(masm, ret_type, workspace_slot_offset);
2172 __ call_VM_leaf(entry_point, R16_thread);
2173 restore_native_result(masm, ret_type, workspace_slot_offset);
2174
2175 __ bind(no_block);
2176
2177 // Publish thread state.
2178 // --------------------------------------------------------------------------
2179
2180 // Thread state is thread_in_native_trans. Any safepoint blocking has
2181 // already happened so we can now change state to _thread_in_Java.
2182
2183 // Transition from _thread_in_native_trans to _thread_in_Java.
2184 __ li(R0, _thread_in_Java);
2185 __ lwsync(); // Acquire safepoint and suspend state, release thread state.
2186 // TODO: PPC port assert(4 == JavaThread::sz_thread_state(), "unexpected field size");
2187 __ stw(R0, thread_(thread_state));
2188 __ bind(after_transition);
2189 }
2190
2191 // Reguard any pages if necessary.
2192 // --------------------------------------------------------------------------
2193
2194 Label no_reguard;
2195 __ lwz(r_temp_1, thread_(stack_guard_state));
2196 __ cmpwi(CCR0, r_temp_1, StackOverflow::stack_guard_yellow_reserved_disabled);
2197 __ bne(CCR0, no_reguard);
2198
2199 save_native_result(masm, ret_type, workspace_slot_offset);
2200 __ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::reguard_yellow_pages));
2201 restore_native_result(masm, ret_type, workspace_slot_offset);
2202
2203 __ bind(no_reguard);
2204
2205
2206 // Unlock
2207 // --------------------------------------------------------------------------
2208
2209 if (method->is_synchronized()) {
2210
2211 ConditionRegister r_flag = CCR1;
2212 const Register r_oop = r_temp_4;
2213 const Register r_box = r_temp_5;
2214 const Register r_exception = r_temp_6;
2215 Label done;
2216
2217 // Get oop and address of lock object box.
2218 if (method_is_static) {
2219 assert(klass_offset != -1, "");
2220 __ ld(r_oop, klass_offset, R1_SP);
2221 } else {
2222 assert(receiver_offset != -1, "");
2223 __ ld(r_oop, receiver_offset, R1_SP);
2224 }
2225 __ addi(r_box, R1_SP, lock_offset);
2226
2227 // Try fastpath for unlocking.
2228 __ compiler_fast_unlock_object(r_flag, r_oop, r_box, r_temp_1, r_temp_2, r_temp_3);
2229 __ beq(r_flag, done);
2230
2231 // Save and restore any potential method result value around the unlocking operation.
2232 save_native_result(masm, ret_type, workspace_slot_offset);
2233
2234 // Must save pending exception around the slow-path VM call. Since it's a
2235 // leaf call, the pending exception (if any) can be kept in a register.
2236 __ ld(r_exception, thread_(pending_exception));
2237 assert(r_exception->is_nonvolatile(), "exception register must be non-volatile");
2238 __ li(R0, 0);
2239 __ std(R0, thread_(pending_exception));
2240
2241 // Slow case of monitor enter.
2242 // Inline a special case of call_VM that disallows any pending_exception.
2243 // Arguments are (oop obj, BasicLock* lock, JavaThread* thread).
2244 __ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::complete_monitor_unlocking_C), r_oop, r_box, R16_thread);
2245
2246 __ asm_assert_mem8_is_zero(thread_(pending_exception),
2247 "no pending exception allowed on exit from SharedRuntime::complete_monitor_unlocking_C");
2248
2249 restore_native_result(masm, ret_type, workspace_slot_offset);
2250
2251 // Check_forward_pending_exception jump to forward_exception if any pending
2252 // exception is set. The forward_exception routine expects to see the
2253 // exception in pending_exception and not in a register. Kind of clumsy,
2254 // since all folks who branch to forward_exception must have tested
2255 // pending_exception first and hence have it in a register already.
2256 __ std(r_exception, thread_(pending_exception));
2257
2258 __ bind(done);
2259 }
2260
2261 # if 0
2262 // DTrace method exit
2263 # endif
2264
2265 // Clear "last Java frame" SP and PC.
2266 // --------------------------------------------------------------------------
2267
2268 __ reset_last_Java_frame();
2269
2270 // Unbox oop result, e.g. JNIHandles::resolve value.
2271 // --------------------------------------------------------------------------
2272
2273 if (is_reference_type(ret_type)) {
2274 __ resolve_jobject(R3_RET, r_temp_1, r_temp_2, MacroAssembler::PRESERVATION_NONE);
2275 }
2276
2277 if (CheckJNICalls) {
2278 // clear_pending_jni_exception_check
2279 __ load_const_optimized(R0, 0L);
2280 __ st_ptr(R0, JavaThread::pending_jni_exception_check_fn_offset(), R16_thread);
2281 }
2282
2283 // Reset handle block.
2284 // --------------------------------------------------------------------------
2285 __ ld(r_temp_1, thread_(active_handles));
2286 // TODO: PPC port assert(4 == JNIHandleBlock::top_size_in_bytes(), "unexpected field size");
2287 __ li(r_temp_2, 0);
2288 __ stw(r_temp_2, JNIHandleBlock::top_offset_in_bytes(), r_temp_1);
2289
2290
2291 // Check for pending exceptions.
2292 // --------------------------------------------------------------------------
2293 __ ld(r_temp_2, thread_(pending_exception));
2294 __ cmpdi(CCR0, r_temp_2, 0);
2295 __ bne(CCR0, handle_pending_exception);
2296
2297 // Return
2298 // --------------------------------------------------------------------------
2299
2300 __ pop_frame();
2301 __ restore_LR_CR(R11);
2302 __ blr();
2303
2304
2305 // Handler for pending exceptions (out-of-line).
2306 // --------------------------------------------------------------------------
2307 // Since this is a native call, we know the proper exception handler
2308 // is the empty function. We just pop this frame and then jump to
2309 // forward_exception_entry.
2310 __ bind(handle_pending_exception);
2311
2312 __ pop_frame();
2313 __ restore_LR_CR(R11);
2314 __ b64_patchable((address)StubRoutines::forward_exception_entry(),
2315 relocInfo::runtime_call_type);
2316
2317 // Handler for a cache miss (out-of-line).
2318 // --------------------------------------------------------------------------
2319
2320 if (!method_is_static) {
2321 __ bind(ic_miss);
2322
2323 __ b64_patchable((address)SharedRuntime::get_ic_miss_stub(),
2324 relocInfo::runtime_call_type);
2325 }
2326
2327 // Done.
2328 // --------------------------------------------------------------------------
2329
2330 __ flush();
2331
2332 nmethod *nm = nmethod::new_native_nmethod(method,
2333 compile_id,
2334 masm->code(),
2335 vep_start_pc-start_pc,
2336 frame_done_pc-start_pc,
2337 stack_slots / VMRegImpl::slots_per_word,
2338 (method_is_static ? in_ByteSize(klass_offset) : in_ByteSize(receiver_offset)),
2339 in_ByteSize(lock_offset),
2340 oop_maps);
2341
2342 return nm;
2343 }
2344
2345 // This function returns the adjust size (in number of words) to a c2i adapter
2346 // activation for use during deoptimization.
2347 int Deoptimization::last_frame_adjust(int callee_parameters, int callee_locals) {
2348 return align_up((callee_locals - callee_parameters) * Interpreter::stackElementWords, frame::alignment_in_bytes);
2349 }
2350
2351 uint SharedRuntime::in_preserve_stack_slots() {
2352 return frame::jit_in_preserve_size / VMRegImpl::stack_slot_size;
2353 }
2354
2355 uint SharedRuntime::out_preserve_stack_slots() {
2356 #if defined(COMPILER1) || defined(COMPILER2)
2357 return frame::jit_out_preserve_size / VMRegImpl::stack_slot_size;
2358 #else
2359 return 0;
2360 #endif
2361 }
2362
2363 #if defined(COMPILER1) || defined(COMPILER2)
2364 // Frame generation for deopt and uncommon trap blobs.
2365 static void push_skeleton_frame(MacroAssembler* masm, bool deopt,
2366 /* Read */
2367 Register unroll_block_reg,
2368 /* Update */
2369 Register frame_sizes_reg,
2370 Register number_of_frames_reg,
2371 Register pcs_reg,
2372 /* Invalidate */
2373 Register frame_size_reg,
2374 Register pc_reg) {
2375
2376 __ ld(pc_reg, 0, pcs_reg);
2377 __ ld(frame_size_reg, 0, frame_sizes_reg);
2378 __ std(pc_reg, _abi0(lr), R1_SP);
2379 __ push_frame(frame_size_reg, R0/*tmp*/);
2380 __ std(R1_SP, _ijava_state_neg(sender_sp), R1_SP);
2381 __ addi(number_of_frames_reg, number_of_frames_reg, -1);
2382 __ addi(frame_sizes_reg, frame_sizes_reg, wordSize);
2383 __ addi(pcs_reg, pcs_reg, wordSize);
2384 }
2385
2386 // Loop through the UnrollBlock info and create new frames.
2387 static void push_skeleton_frames(MacroAssembler* masm, bool deopt,
2388 /* read */
2389 Register unroll_block_reg,
2390 /* invalidate */
2391 Register frame_sizes_reg,
2392 Register number_of_frames_reg,
2393 Register pcs_reg,
2394 Register frame_size_reg,
2395 Register pc_reg) {
2396 Label loop;
2397
2398 // _number_of_frames is of type int (deoptimization.hpp)
2399 __ lwa(number_of_frames_reg,
2400 Deoptimization::UnrollBlock::number_of_frames_offset_in_bytes(),
2401 unroll_block_reg);
2402 __ ld(pcs_reg,
2403 Deoptimization::UnrollBlock::frame_pcs_offset_in_bytes(),
2404 unroll_block_reg);
2405 __ ld(frame_sizes_reg,
2406 Deoptimization::UnrollBlock::frame_sizes_offset_in_bytes(),
2407 unroll_block_reg);
2408
2409 // stack: (caller_of_deoptee, ...).
2410
2411 // At this point we either have an interpreter frame or a compiled
2412 // frame on top of stack. If it is a compiled frame we push a new c2i
2413 // adapter here
2414
2415 // Memorize top-frame stack-pointer.
2416 __ mr(frame_size_reg/*old_sp*/, R1_SP);
2417
2418 // Resize interpreter top frame OR C2I adapter.
2419
2420 // At this moment, the top frame (which is the caller of the deoptee) is
2421 // an interpreter frame or a newly pushed C2I adapter or an entry frame.
2422 // The top frame has a TOP_IJAVA_FRAME_ABI and the frame contains the
2423 // outgoing arguments.
2424 //
2425 // In order to push the interpreter frame for the deoptee, we need to
2426 // resize the top frame such that we are able to place the deoptee's
2427 // locals in the frame.
2428 // Additionally, we have to turn the top frame's TOP_IJAVA_FRAME_ABI
2429 // into a valid PARENT_IJAVA_FRAME_ABI.
2430
2431 __ lwa(R11_scratch1,
2432 Deoptimization::UnrollBlock::caller_adjustment_offset_in_bytes(),
2433 unroll_block_reg);
2434 __ neg(R11_scratch1, R11_scratch1);
2435
2436 // R11_scratch1 contains size of locals for frame resizing.
2437 // R12_scratch2 contains top frame's lr.
2438
2439 // Resize frame by complete frame size prevents TOC from being
2440 // overwritten by locals. A more stack space saving way would be
2441 // to copy the TOC to its location in the new abi.
2442 __ addi(R11_scratch1, R11_scratch1, - frame::parent_ijava_frame_abi_size);
2443
2444 // now, resize the frame
2445 __ resize_frame(R11_scratch1, pc_reg/*tmp*/);
2446
2447 // In the case where we have resized a c2i frame above, the optional
2448 // alignment below the locals has size 32 (why?).
2449 __ std(R12_scratch2, _abi0(lr), R1_SP);
2450
2451 // Initialize initial_caller_sp.
2452 __ std(frame_size_reg, _ijava_state_neg(sender_sp), R1_SP);
2453
2454 #ifdef ASSERT
2455 // Make sure that there is at least one entry in the array.
2456 __ cmpdi(CCR0, number_of_frames_reg, 0);
2457 __ asm_assert_ne("array_size must be > 0");
2458 #endif
2459
2460 // Now push the new interpreter frames.
2461 //
2462 __ bind(loop);
2463 // Allocate a new frame, fill in the pc.
2464 push_skeleton_frame(masm, deopt,
2465 unroll_block_reg,
2466 frame_sizes_reg,
2467 number_of_frames_reg,
2468 pcs_reg,
2469 frame_size_reg,
2470 pc_reg);
2471 __ cmpdi(CCR0, number_of_frames_reg, 0);
2472 __ bne(CCR0, loop);
2473
2474 // Get the return address pointing into the frame manager.
2475 __ ld(R0, 0, pcs_reg);
2476 // Store it in the top interpreter frame.
2477 __ std(R0, _abi0(lr), R1_SP);
2478 // Initialize frame_manager_lr of interpreter top frame.
2479 }
2480 #endif
2481
2482 void SharedRuntime::generate_deopt_blob() {
2483 // Allocate space for the code
2484 ResourceMark rm;
2485 // Setup code generation tools
2486 CodeBuffer buffer("deopt_blob", 2048, 1024);
2487 InterpreterMacroAssembler* masm = new InterpreterMacroAssembler(&buffer);
2488 Label exec_mode_initialized;
2489 int frame_size_in_words;
2490 OopMap* map = NULL;
2491 OopMapSet *oop_maps = new OopMapSet();
2492
2493 // size of ABI112 plus spill slots for R3_RET and F1_RET.
2494 const int frame_size_in_bytes = frame::abi_reg_args_spill_size;
2495 const int frame_size_in_slots = frame_size_in_bytes / sizeof(jint);
2496 int first_frame_size_in_bytes = 0; // frame size of "unpack frame" for call to fetch_unroll_info.
2497
2498 const Register exec_mode_reg = R21_tmp1;
2499
2500 const address start = __ pc();
2501
2502 #if defined(COMPILER1) || defined(COMPILER2)
2503 // --------------------------------------------------------------------------
2504 // Prolog for non exception case!
2505
2506 // We have been called from the deopt handler of the deoptee.
2507 //
2508 // deoptee:
2509 // ...
2510 // call X
2511 // ...
2512 // deopt_handler: call_deopt_stub
2513 // cur. return pc --> ...
2514 //
2515 // So currently SR_LR points behind the call in the deopt handler.
2516 // We adjust it such that it points to the start of the deopt handler.
2517 // The return_pc has been stored in the frame of the deoptee and
2518 // will replace the address of the deopt_handler in the call
2519 // to Deoptimization::fetch_unroll_info below.
2520 // We can't grab a free register here, because all registers may
2521 // contain live values, so let the RegisterSaver do the adjustment
2522 // of the return pc.
2523 const int return_pc_adjustment_no_exception = -MacroAssembler::bl64_patchable_size;
2524
2525 // Push the "unpack frame"
2526 // Save everything in sight.
2527 map = RegisterSaver::push_frame_reg_args_and_save_live_registers(masm,
2528 &first_frame_size_in_bytes,
2529 /*generate_oop_map=*/ true,
2530 return_pc_adjustment_no_exception,
2531 RegisterSaver::return_pc_is_lr);
2532 assert(map != NULL, "OopMap must have been created");
2533
2534 __ li(exec_mode_reg, Deoptimization::Unpack_deopt);
2535 // Save exec mode for unpack_frames.
2536 __ b(exec_mode_initialized);
2537
2538 // --------------------------------------------------------------------------
2539 // Prolog for exception case
2540
2541 // An exception is pending.
2542 // We have been called with a return (interpreter) or a jump (exception blob).
2543 //
2544 // - R3_ARG1: exception oop
2545 // - R4_ARG2: exception pc
2546
2547 int exception_offset = __ pc() - start;
2548
2549 BLOCK_COMMENT("Prolog for exception case");
2550
2551 // Store exception oop and pc in thread (location known to GC).
2552 // This is needed since the call to "fetch_unroll_info()" may safepoint.
2553 __ std(R3_ARG1, in_bytes(JavaThread::exception_oop_offset()), R16_thread);
2554 __ std(R4_ARG2, in_bytes(JavaThread::exception_pc_offset()), R16_thread);
2555 __ std(R4_ARG2, _abi0(lr), R1_SP);
2556
2557 // Vanilla deoptimization with an exception pending in exception_oop.
2558 int exception_in_tls_offset = __ pc() - start;
2559
2560 // Push the "unpack frame".
2561 // Save everything in sight.
2562 RegisterSaver::push_frame_reg_args_and_save_live_registers(masm,
2563 &first_frame_size_in_bytes,
2564 /*generate_oop_map=*/ false,
2565 /*return_pc_adjustment_exception=*/ 0,
2566 RegisterSaver::return_pc_is_pre_saved);
2567
2568 // Deopt during an exception. Save exec mode for unpack_frames.
2569 __ li(exec_mode_reg, Deoptimization::Unpack_exception);
2570
2571 // fall through
2572
2573 int reexecute_offset = 0;
2574 #ifdef COMPILER1
2575 __ b(exec_mode_initialized);
2576
2577 // Reexecute entry, similar to c2 uncommon trap
2578 reexecute_offset = __ pc() - start;
2579
2580 RegisterSaver::push_frame_reg_args_and_save_live_registers(masm,
2581 &first_frame_size_in_bytes,
2582 /*generate_oop_map=*/ false,
2583 /*return_pc_adjustment_reexecute=*/ 0,
2584 RegisterSaver::return_pc_is_pre_saved);
2585 __ li(exec_mode_reg, Deoptimization::Unpack_reexecute);
2586 #endif
2587
2588 // --------------------------------------------------------------------------
2589 __ BIND(exec_mode_initialized);
2590
2591 {
2592 const Register unroll_block_reg = R22_tmp2;
2593
2594 // We need to set `last_Java_frame' because `fetch_unroll_info' will
2595 // call `last_Java_frame()'. The value of the pc in the frame is not
2596 // particularly important. It just needs to identify this blob.
2597 __ set_last_Java_frame(R1_SP, noreg);
2598
2599 // With EscapeAnalysis turned on, this call may safepoint!
2600 __ call_VM_leaf(CAST_FROM_FN_PTR(address, Deoptimization::fetch_unroll_info), R16_thread, exec_mode_reg);
2601 address calls_return_pc = __ last_calls_return_pc();
2602 // Set an oopmap for the call site that describes all our saved registers.
2603 oop_maps->add_gc_map(calls_return_pc - start, map);
2604
2605 __ reset_last_Java_frame();
2606 // Save the return value.
2607 __ mr(unroll_block_reg, R3_RET);
2608
2609 // Restore only the result registers that have been saved
2610 // by save_volatile_registers(...).
2611 RegisterSaver::restore_result_registers(masm, first_frame_size_in_bytes);
2612
2613 // reload the exec mode from the UnrollBlock (it might have changed)
2614 __ lwz(exec_mode_reg, Deoptimization::UnrollBlock::unpack_kind_offset_in_bytes(), unroll_block_reg);
2615 // In excp_deopt_mode, restore and clear exception oop which we
2616 // stored in the thread during exception entry above. The exception
2617 // oop will be the return value of this stub.
2618 Label skip_restore_excp;
2619 __ cmpdi(CCR0, exec_mode_reg, Deoptimization::Unpack_exception);
2620 __ bne(CCR0, skip_restore_excp);
2621 __ ld(R3_RET, in_bytes(JavaThread::exception_oop_offset()), R16_thread);
2622 __ ld(R4_ARG2, in_bytes(JavaThread::exception_pc_offset()), R16_thread);
2623 __ li(R0, 0);
2624 __ std(R0, in_bytes(JavaThread::exception_pc_offset()), R16_thread);
2625 __ std(R0, in_bytes(JavaThread::exception_oop_offset()), R16_thread);
2626 __ BIND(skip_restore_excp);
2627
2628 __ pop_frame();
2629
2630 // stack: (deoptee, optional i2c, caller of deoptee, ...).
2631
2632 // pop the deoptee's frame
2633 __ pop_frame();
2634
2635 // stack: (caller_of_deoptee, ...).
2636
2637 // Loop through the `UnrollBlock' info and create interpreter frames.
2638 push_skeleton_frames(masm, true/*deopt*/,
2639 unroll_block_reg,
2640 R23_tmp3,
2641 R24_tmp4,
2642 R25_tmp5,
2643 R26_tmp6,
2644 R27_tmp7);
2645
2646 // stack: (skeletal interpreter frame, ..., optional skeletal
2647 // interpreter frame, optional c2i, caller of deoptee, ...).
2648 }
2649
2650 // push an `unpack_frame' taking care of float / int return values.
2651 __ push_frame(frame_size_in_bytes, R0/*tmp*/);
2652
2653 // stack: (unpack frame, skeletal interpreter frame, ..., optional
2654 // skeletal interpreter frame, optional c2i, caller of deoptee,
2655 // ...).
2656
2657 // Spill live volatile registers since we'll do a call.
2658 __ std( R3_RET, _abi_reg_args_spill(spill_ret), R1_SP);
2659 __ stfd(F1_RET, _abi_reg_args_spill(spill_fret), R1_SP);
2660
2661 // Let the unpacker layout information in the skeletal frames just
2662 // allocated.
2663 __ get_PC_trash_LR(R3_RET);
2664 __ set_last_Java_frame(/*sp*/R1_SP, /*pc*/R3_RET);
2665 // This is a call to a LEAF method, so no oop map is required.
2666 __ call_VM_leaf(CAST_FROM_FN_PTR(address, Deoptimization::unpack_frames),
2667 R16_thread/*thread*/, exec_mode_reg/*exec_mode*/);
2668 __ reset_last_Java_frame();
2669
2670 // Restore the volatiles saved above.
2671 __ ld( R3_RET, _abi_reg_args_spill(spill_ret), R1_SP);
2672 __ lfd(F1_RET, _abi_reg_args_spill(spill_fret), R1_SP);
2673
2674 // Pop the unpack frame.
2675 __ pop_frame();
2676 __ restore_LR_CR(R0);
2677
2678 // stack: (top interpreter frame, ..., optional interpreter frame,
2679 // optional c2i, caller of deoptee, ...).
2680
2681 // Initialize R14_state.
2682 __ restore_interpreter_state(R11_scratch1);
2683 __ load_const_optimized(R25_templateTableBase, (address)Interpreter::dispatch_table((TosState)0), R11_scratch1);
2684
2685 // Return to the interpreter entry point.
2686 __ blr();
2687 __ flush();
2688 #else // COMPILER2
2689 __ unimplemented("deopt blob needed only with compiler");
2690 int exception_offset = __ pc() - start;
2691 #endif // COMPILER2
2692
2693 _deopt_blob = DeoptimizationBlob::create(&buffer, oop_maps, 0, exception_offset,
2694 reexecute_offset, first_frame_size_in_bytes / wordSize);
2695 _deopt_blob->set_unpack_with_exception_in_tls_offset(exception_in_tls_offset);
2696 }
2697
2698 #ifdef COMPILER2
2699 void SharedRuntime::generate_uncommon_trap_blob() {
2700 // Allocate space for the code.
2701 ResourceMark rm;
2702 // Setup code generation tools.
2703 CodeBuffer buffer("uncommon_trap_blob", 2048, 1024);
2704 InterpreterMacroAssembler* masm = new InterpreterMacroAssembler(&buffer);
2705 address start = __ pc();
2706
2707 if (UseRTMLocking) {
2708 // Abort RTM transaction before possible nmethod deoptimization.
2709 __ tabort_();
2710 }
2711
2712 Register unroll_block_reg = R21_tmp1;
2713 Register klass_index_reg = R22_tmp2;
2714 Register unc_trap_reg = R23_tmp3;
2715
2716 OopMapSet* oop_maps = new OopMapSet();
2717 int frame_size_in_bytes = frame::abi_reg_args_size;
2718 OopMap* map = new OopMap(frame_size_in_bytes / sizeof(jint), 0);
2719
2720 // stack: (deoptee, optional i2c, caller_of_deoptee, ...).
2721
2722 // Push a dummy `unpack_frame' and call
2723 // `Deoptimization::uncommon_trap' to pack the compiled frame into a
2724 // vframe array and return the `UnrollBlock' information.
2725
2726 // Save LR to compiled frame.
2727 __ save_LR_CR(R11_scratch1);
2728
2729 // Push an "uncommon_trap" frame.
2730 __ push_frame_reg_args(0, R11_scratch1);
2731
2732 // stack: (unpack frame, deoptee, optional i2c, caller_of_deoptee, ...).
2733
2734 // Set the `unpack_frame' as last_Java_frame.
2735 // `Deoptimization::uncommon_trap' expects it and considers its
2736 // sender frame as the deoptee frame.
2737 // Remember the offset of the instruction whose address will be
2738 // moved to R11_scratch1.
2739 address gc_map_pc = __ get_PC_trash_LR(R11_scratch1);
2740
2741 __ set_last_Java_frame(/*sp*/R1_SP, /*pc*/R11_scratch1);
2742
2743 __ mr(klass_index_reg, R3);
2744 __ li(R5_ARG3, Deoptimization::Unpack_uncommon_trap);
2745 __ call_VM_leaf(CAST_FROM_FN_PTR(address, Deoptimization::uncommon_trap),
2746 R16_thread, klass_index_reg, R5_ARG3);
2747
2748 // Set an oopmap for the call site.
2749 oop_maps->add_gc_map(gc_map_pc - start, map);
2750
2751 __ reset_last_Java_frame();
2752
2753 // Pop the `unpack frame'.
2754 __ pop_frame();
2755
2756 // stack: (deoptee, optional i2c, caller_of_deoptee, ...).
2757
2758 // Save the return value.
2759 __ mr(unroll_block_reg, R3_RET);
2760
2761 // Pop the uncommon_trap frame.
2762 __ pop_frame();
2763
2764 // stack: (caller_of_deoptee, ...).
2765
2766 #ifdef ASSERT
2767 __ lwz(R22_tmp2, Deoptimization::UnrollBlock::unpack_kind_offset_in_bytes(), unroll_block_reg);
2768 __ cmpdi(CCR0, R22_tmp2, (unsigned)Deoptimization::Unpack_uncommon_trap);
2769 __ asm_assert_eq("SharedRuntime::generate_deopt_blob: expected Unpack_uncommon_trap");
2770 #endif
2771
2772 // Allocate new interpreter frame(s) and possibly a c2i adapter
2773 // frame.
2774 push_skeleton_frames(masm, false/*deopt*/,
2775 unroll_block_reg,
2776 R22_tmp2,
2777 R23_tmp3,
2778 R24_tmp4,
2779 R25_tmp5,
2780 R26_tmp6);
2781
2782 // stack: (skeletal interpreter frame, ..., optional skeletal
2783 // interpreter frame, optional c2i, caller of deoptee, ...).
2784
2785 // Push a dummy `unpack_frame' taking care of float return values.
2786 // Call `Deoptimization::unpack_frames' to layout information in the
2787 // interpreter frames just created.
2788
2789 // Push a simple "unpack frame" here.
2790 __ push_frame_reg_args(0, R11_scratch1);
2791
2792 // stack: (unpack frame, skeletal interpreter frame, ..., optional
2793 // skeletal interpreter frame, optional c2i, caller of deoptee,
2794 // ...).
2795
2796 // Set the "unpack_frame" as last_Java_frame.
2797 __ get_PC_trash_LR(R11_scratch1);
2798 __ set_last_Java_frame(/*sp*/R1_SP, /*pc*/R11_scratch1);
2799
2800 // Indicate it is the uncommon trap case.
2801 __ li(unc_trap_reg, Deoptimization::Unpack_uncommon_trap);
2802 // Let the unpacker layout information in the skeletal frames just
2803 // allocated.
2804 __ call_VM_leaf(CAST_FROM_FN_PTR(address, Deoptimization::unpack_frames),
2805 R16_thread, unc_trap_reg);
2806
2807 __ reset_last_Java_frame();
2808 // Pop the `unpack frame'.
2809 __ pop_frame();
2810 // Restore LR from top interpreter frame.
2811 __ restore_LR_CR(R11_scratch1);
2812
2813 // stack: (top interpreter frame, ..., optional interpreter frame,
2814 // optional c2i, caller of deoptee, ...).
2815
2816 __ restore_interpreter_state(R11_scratch1);
2817 __ load_const_optimized(R25_templateTableBase, (address)Interpreter::dispatch_table((TosState)0), R11_scratch1);
2818
2819 // Return to the interpreter entry point.
2820 __ blr();
2821
2822 masm->flush();
2823
2824 _uncommon_trap_blob = UncommonTrapBlob::create(&buffer, oop_maps, frame_size_in_bytes/wordSize);
2825 }
2826 #endif // COMPILER2
2827
2828 // Generate a special Compile2Runtime blob that saves all registers, and setup oopmap.
2829 SafepointBlob* SharedRuntime::generate_handler_blob(address call_ptr, int poll_type) {
2830 assert(StubRoutines::forward_exception_entry() != NULL,
2831 "must be generated before");
2832
2833 ResourceMark rm;
2834 OopMapSet *oop_maps = new OopMapSet();
2835 OopMap* map;
2836
2837 // Allocate space for the code. Setup code generation tools.
2838 CodeBuffer buffer("handler_blob", 2048, 1024);
2839 MacroAssembler* masm = new MacroAssembler(&buffer);
2840
2841 address start = __ pc();
2842 int frame_size_in_bytes = 0;
2843
2844 RegisterSaver::ReturnPCLocation return_pc_location;
2845 bool cause_return = (poll_type == POLL_AT_RETURN);
2846 if (cause_return) {
2847 // Nothing to do here. The frame has already been popped in MachEpilogNode.
2848 // Register LR already contains the return pc.
2849 return_pc_location = RegisterSaver::return_pc_is_pre_saved;
2850 } else {
2851 // Use thread()->saved_exception_pc() as return pc.
2852 return_pc_location = RegisterSaver::return_pc_is_thread_saved_exception_pc;
2853 }
2854
2855 if (UseRTMLocking) {
2856 // Abort RTM transaction before calling runtime
2857 // because critical section can be large and so
2858 // will abort anyway. Also nmethod can be deoptimized.
2859 __ tabort_();
2860 }
2861
2862 bool save_vectors = (poll_type == POLL_AT_VECTOR_LOOP);
2863
2864 // Save registers, fpu state, and flags. Set R31 = return pc.
2865 map = RegisterSaver::push_frame_reg_args_and_save_live_registers(masm,
2866 &frame_size_in_bytes,
2867 /*generate_oop_map=*/ true,
2868 /*return_pc_adjustment=*/0,
2869 return_pc_location, save_vectors);
2870
2871 // The following is basically a call_VM. However, we need the precise
2872 // address of the call in order to generate an oopmap. Hence, we do all the
2873 // work ourselves.
2874 __ set_last_Java_frame(/*sp=*/R1_SP, /*pc=*/noreg);
2875
2876 // The return address must always be correct so that the frame constructor
2877 // never sees an invalid pc.
2878
2879 // Do the call
2880 __ call_VM_leaf(call_ptr, R16_thread);
2881 address calls_return_pc = __ last_calls_return_pc();
2882
2883 // Set an oopmap for the call site. This oopmap will map all
2884 // oop-registers and debug-info registers as callee-saved. This
2885 // will allow deoptimization at this safepoint to find all possible
2886 // debug-info recordings, as well as let GC find all oops.
2887 oop_maps->add_gc_map(calls_return_pc - start, map);
2888
2889 Label noException;
2890
2891 // Clear the last Java frame.
2892 __ reset_last_Java_frame();
2893
2894 BLOCK_COMMENT(" Check pending exception.");
2895 const Register pending_exception = R0;
2896 __ ld(pending_exception, thread_(pending_exception));
2897 __ cmpdi(CCR0, pending_exception, 0);
2898 __ beq(CCR0, noException);
2899
2900 // Exception pending
2901 RegisterSaver::restore_live_registers_and_pop_frame(masm,
2902 frame_size_in_bytes,
2903 /*restore_ctr=*/true, save_vectors);
2904
2905 BLOCK_COMMENT(" Jump to forward_exception_entry.");
2906 // Jump to forward_exception_entry, with the issuing PC in LR
2907 // so it looks like the original nmethod called forward_exception_entry.
2908 __ b64_patchable(StubRoutines::forward_exception_entry(), relocInfo::runtime_call_type);
2909
2910 // No exception case.
2911 __ BIND(noException);
2912
2913 if (!cause_return) {
2914 Label no_adjust;
2915 // If our stashed return pc was modified by the runtime we avoid touching it
2916 __ ld(R0, frame_size_in_bytes + _abi0(lr), R1_SP);
2917 __ cmpd(CCR0, R0, R31);
2918 __ bne(CCR0, no_adjust);
2919
2920 // Adjust return pc forward to step over the safepoint poll instruction
2921 __ addi(R31, R31, 4);
2922 __ std(R31, frame_size_in_bytes + _abi0(lr), R1_SP);
2923
2924 __ bind(no_adjust);
2925 }
2926
2927 // Normal exit, restore registers and exit.
2928 RegisterSaver::restore_live_registers_and_pop_frame(masm,
2929 frame_size_in_bytes,
2930 /*restore_ctr=*/true, save_vectors);
2931
2932 __ blr();
2933
2934 // Make sure all code is generated
2935 masm->flush();
2936
2937 // Fill-out other meta info
2938 // CodeBlob frame size is in words.
2939 return SafepointBlob::create(&buffer, oop_maps, frame_size_in_bytes / wordSize);
2940 }
2941
2942 // generate_resolve_blob - call resolution (static/virtual/opt-virtual/ic-miss)
2943 //
2944 // Generate a stub that calls into the vm to find out the proper destination
2945 // of a java call. All the argument registers are live at this point
2946 // but since this is generic code we don't know what they are and the caller
2947 // must do any gc of the args.
2948 //
2949 RuntimeStub* SharedRuntime::generate_resolve_blob(address destination, const char* name) {
2950
2951 // allocate space for the code
2952 ResourceMark rm;
2953
2954 CodeBuffer buffer(name, 1000, 512);
2955 MacroAssembler* masm = new MacroAssembler(&buffer);
2956
2957 int frame_size_in_bytes;
2958
2959 OopMapSet *oop_maps = new OopMapSet();
2960 OopMap* map = NULL;
2961
2962 address start = __ pc();
2963
2964 map = RegisterSaver::push_frame_reg_args_and_save_live_registers(masm,
2965 &frame_size_in_bytes,
2966 /*generate_oop_map*/ true,
2967 /*return_pc_adjustment*/ 0,
2968 RegisterSaver::return_pc_is_lr);
2969
2970 // Use noreg as last_Java_pc, the return pc will be reconstructed
2971 // from the physical frame.
2972 __ set_last_Java_frame(/*sp*/R1_SP, noreg);
2973
2974 int frame_complete = __ offset();
2975
2976 // Pass R19_method as 2nd (optional) argument, used by
2977 // counter_overflow_stub.
2978 __ call_VM_leaf(destination, R16_thread, R19_method);
2979 address calls_return_pc = __ last_calls_return_pc();
2980 // Set an oopmap for the call site.
2981 // We need this not only for callee-saved registers, but also for volatile
2982 // registers that the compiler might be keeping live across a safepoint.
2983 // Create the oopmap for the call's return pc.
2984 oop_maps->add_gc_map(calls_return_pc - start, map);
2985
2986 // R3_RET contains the address we are going to jump to assuming no exception got installed.
2987
2988 // clear last_Java_sp
2989 __ reset_last_Java_frame();
2990
2991 // Check for pending exceptions.
2992 BLOCK_COMMENT("Check for pending exceptions.");
2993 Label pending;
2994 __ ld(R11_scratch1, thread_(pending_exception));
2995 __ cmpdi(CCR0, R11_scratch1, 0);
2996 __ bne(CCR0, pending);
2997
2998 __ mtctr(R3_RET); // Ctr will not be touched by restore_live_registers_and_pop_frame.
2999
3000 RegisterSaver::restore_live_registers_and_pop_frame(masm, frame_size_in_bytes, /*restore_ctr*/ false);
3001
3002 // Get the returned method.
3003 __ get_vm_result_2(R19_method);
3004
3005 __ bctr();
3006
3007
3008 // Pending exception after the safepoint.
3009 __ BIND(pending);
3010
3011 RegisterSaver::restore_live_registers_and_pop_frame(masm, frame_size_in_bytes, /*restore_ctr*/ true);
3012
3013 // exception pending => remove activation and forward to exception handler
3014
3015 __ li(R11_scratch1, 0);
3016 __ ld(R3_ARG1, thread_(pending_exception));
3017 __ std(R11_scratch1, in_bytes(JavaThread::vm_result_offset()), R16_thread);
3018 __ b64_patchable(StubRoutines::forward_exception_entry(), relocInfo::runtime_call_type);
3019
3020 // -------------
3021 // Make sure all code is generated.
3022 masm->flush();
3023
3024 // return the blob
3025 // frame_size_words or bytes??
3026 return RuntimeStub::new_runtime_stub(name, &buffer, frame_complete, frame_size_in_bytes/wordSize,
3027 oop_maps, true);
3028 }
3029
3030
3031 //------------------------------Montgomery multiplication------------------------
3032 //
3033
3034 // Subtract 0:b from carry:a. Return carry.
3035 static unsigned long
3036 sub(unsigned long a[], unsigned long b[], unsigned long carry, long len) {
3037 long i = 0;
3038 unsigned long tmp, tmp2;
3039 __asm__ __volatile__ (
3040 "subfc %[tmp], %[tmp], %[tmp] \n" // pre-set CA
3041 "mtctr %[len] \n"
3042 "0: \n"
3043 "ldx %[tmp], %[i], %[a] \n"
3044 "ldx %[tmp2], %[i], %[b] \n"
3045 "subfe %[tmp], %[tmp2], %[tmp] \n" // subtract extended
3046 "stdx %[tmp], %[i], %[a] \n"
3047 "addi %[i], %[i], 8 \n"
3048 "bdnz 0b \n"
3049 "addme %[tmp], %[carry] \n" // carry + CA - 1
3050 : [i]"+b"(i), [tmp]"=&r"(tmp), [tmp2]"=&r"(tmp2)
3051 : [a]"r"(a), [b]"r"(b), [carry]"r"(carry), [len]"r"(len)
3052 : "ctr", "xer", "memory"
3053 );
3054 return tmp;
3055 }
3056
3057 // Multiply (unsigned) Long A by Long B, accumulating the double-
3058 // length result into the accumulator formed of T0, T1, and T2.
3059 inline void MACC(unsigned long A, unsigned long B, unsigned long &T0, unsigned long &T1, unsigned long &T2) {
3060 unsigned long hi, lo;
3061 __asm__ __volatile__ (
3062 "mulld %[lo], %[A], %[B] \n"
3063 "mulhdu %[hi], %[A], %[B] \n"
3064 "addc %[T0], %[T0], %[lo] \n"
3065 "adde %[T1], %[T1], %[hi] \n"
3066 "addze %[T2], %[T2] \n"
3067 : [hi]"=&r"(hi), [lo]"=&r"(lo), [T0]"+r"(T0), [T1]"+r"(T1), [T2]"+r"(T2)
3068 : [A]"r"(A), [B]"r"(B)
3069 : "xer"
3070 );
3071 }
3072
3073 // As above, but add twice the double-length result into the
3074 // accumulator.
3075 inline void MACC2(unsigned long A, unsigned long B, unsigned long &T0, unsigned long &T1, unsigned long &T2) {
3076 unsigned long hi, lo;
3077 __asm__ __volatile__ (
3078 "mulld %[lo], %[A], %[B] \n"
3079 "mulhdu %[hi], %[A], %[B] \n"
3080 "addc %[T0], %[T0], %[lo] \n"
3081 "adde %[T1], %[T1], %[hi] \n"
3082 "addze %[T2], %[T2] \n"
3083 "addc %[T0], %[T0], %[lo] \n"
3084 "adde %[T1], %[T1], %[hi] \n"
3085 "addze %[T2], %[T2] \n"
3086 : [hi]"=&r"(hi), [lo]"=&r"(lo), [T0]"+r"(T0), [T1]"+r"(T1), [T2]"+r"(T2)
3087 : [A]"r"(A), [B]"r"(B)
3088 : "xer"
3089 );
3090 }
3091
3092 // Fast Montgomery multiplication. The derivation of the algorithm is
3093 // in "A Cryptographic Library for the Motorola DSP56000,
3094 // Dusse and Kaliski, Proc. EUROCRYPT 90, pp. 230-237".
3095 static void
3096 montgomery_multiply(unsigned long a[], unsigned long b[], unsigned long n[],
3097 unsigned long m[], unsigned long inv, int len) {
3098 unsigned long t0 = 0, t1 = 0, t2 = 0; // Triple-precision accumulator
3099 int i;
3100
3101 assert(inv * n[0] == -1UL, "broken inverse in Montgomery multiply");
3102
3103 for (i = 0; i < len; i++) {
3104 int j;
3105 for (j = 0; j < i; j++) {
3106 MACC(a[j], b[i-j], t0, t1, t2);
3107 MACC(m[j], n[i-j], t0, t1, t2);
3108 }
3109 MACC(a[i], b[0], t0, t1, t2);
3110 m[i] = t0 * inv;
3111 MACC(m[i], n[0], t0, t1, t2);
3112
3113 assert(t0 == 0, "broken Montgomery multiply");
3114
3115 t0 = t1; t1 = t2; t2 = 0;
3116 }
3117
3118 for (i = len; i < 2*len; i++) {
3119 int j;
3120 for (j = i-len+1; j < len; j++) {
3121 MACC(a[j], b[i-j], t0, t1, t2);
3122 MACC(m[j], n[i-j], t0, t1, t2);
3123 }
3124 m[i-len] = t0;
3125 t0 = t1; t1 = t2; t2 = 0;
3126 }
3127
3128 while (t0) {
3129 t0 = sub(m, n, t0, len);
3130 }
3131 }
3132
3133 // Fast Montgomery squaring. This uses asymptotically 25% fewer
3134 // multiplies so it should be up to 25% faster than Montgomery
3135 // multiplication. However, its loop control is more complex and it
3136 // may actually run slower on some machines.
3137 static void
3138 montgomery_square(unsigned long a[], unsigned long n[],
3139 unsigned long m[], unsigned long inv, int len) {
3140 unsigned long t0 = 0, t1 = 0, t2 = 0; // Triple-precision accumulator
3141 int i;
3142
3143 assert(inv * n[0] == -1UL, "broken inverse in Montgomery multiply");
3144
3145 for (i = 0; i < len; i++) {
3146 int j;
3147 int end = (i+1)/2;
3148 for (j = 0; j < end; j++) {
3149 MACC2(a[j], a[i-j], t0, t1, t2);
3150 MACC(m[j], n[i-j], t0, t1, t2);
3151 }
3152 if ((i & 1) == 0) {
3153 MACC(a[j], a[j], t0, t1, t2);
3154 }
3155 for (; j < i; j++) {
3156 MACC(m[j], n[i-j], t0, t1, t2);
3157 }
3158 m[i] = t0 * inv;
3159 MACC(m[i], n[0], t0, t1, t2);
3160
3161 assert(t0 == 0, "broken Montgomery square");
3162
3163 t0 = t1; t1 = t2; t2 = 0;
3164 }
3165
3166 for (i = len; i < 2*len; i++) {
3167 int start = i-len+1;
3168 int end = start + (len - start)/2;
3169 int j;
3170 for (j = start; j < end; j++) {
3171 MACC2(a[j], a[i-j], t0, t1, t2);
3172 MACC(m[j], n[i-j], t0, t1, t2);
3173 }
3174 if ((i & 1) == 0) {
3175 MACC(a[j], a[j], t0, t1, t2);
3176 }
3177 for (; j < len; j++) {
3178 MACC(m[j], n[i-j], t0, t1, t2);
3179 }
3180 m[i-len] = t0;
3181 t0 = t1; t1 = t2; t2 = 0;
3182 }
3183
3184 while (t0) {
3185 t0 = sub(m, n, t0, len);
3186 }
3187 }
3188
3189 // The threshold at which squaring is advantageous was determined
3190 // experimentally on an i7-3930K (Ivy Bridge) CPU @ 3.5GHz.
3191 // Doesn't seem to be relevant for Power8 so we use the same value.
3192 #define MONTGOMERY_SQUARING_THRESHOLD 64
3193
3194 // Copy len longwords from s to d, word-swapping as we go. The
3195 // destination array is reversed.
3196 static void reverse_words(unsigned long *s, unsigned long *d, int len) {
3197 d += len;
3198 while(len-- > 0) {
3199 d--;
3200 unsigned long s_val = *s;
3201 // Swap words in a longword on little endian machines.
3202 #ifdef VM_LITTLE_ENDIAN
3203 s_val = (s_val << 32) | (s_val >> 32);
3204 #endif
3205 *d = s_val;
3206 s++;
3207 }
3208 }
3209
3210 void SharedRuntime::montgomery_multiply(jint *a_ints, jint *b_ints, jint *n_ints,
3211 jint len, jlong inv,
3212 jint *m_ints) {
3213 len = len & 0x7fffFFFF; // C2 does not respect int to long conversion for stub calls.
3214 assert(len % 2 == 0, "array length in montgomery_multiply must be even");
3215 int longwords = len/2;
3216
3217 // Make very sure we don't use so much space that the stack might
3218 // overflow. 512 jints corresponds to an 16384-bit integer and
3219 // will use here a total of 8k bytes of stack space.
3220 int divisor = sizeof(unsigned long) * 4;
3221 guarantee(longwords <= 8192 / divisor, "must be");
3222 int total_allocation = longwords * sizeof (unsigned long) * 4;
3223 unsigned long *scratch = (unsigned long *)alloca(total_allocation);
3224
3225 // Local scratch arrays
3226 unsigned long
3227 *a = scratch + 0 * longwords,
3228 *b = scratch + 1 * longwords,
3229 *n = scratch + 2 * longwords,
3230 *m = scratch + 3 * longwords;
3231
3232 reverse_words((unsigned long *)a_ints, a, longwords);
3233 reverse_words((unsigned long *)b_ints, b, longwords);
3234 reverse_words((unsigned long *)n_ints, n, longwords);
3235
3236 ::montgomery_multiply(a, b, n, m, (unsigned long)inv, longwords);
3237
3238 reverse_words(m, (unsigned long *)m_ints, longwords);
3239 }
3240
3241 void SharedRuntime::montgomery_square(jint *a_ints, jint *n_ints,
3242 jint len, jlong inv,
3243 jint *m_ints) {
3244 len = len & 0x7fffFFFF; // C2 does not respect int to long conversion for stub calls.
3245 assert(len % 2 == 0, "array length in montgomery_square must be even");
3246 int longwords = len/2;
3247
3248 // Make very sure we don't use so much space that the stack might
3249 // overflow. 512 jints corresponds to an 16384-bit integer and
3250 // will use here a total of 6k bytes of stack space.
3251 int divisor = sizeof(unsigned long) * 3;
3252 guarantee(longwords <= (8192 / divisor), "must be");
3253 int total_allocation = longwords * sizeof (unsigned long) * 3;
3254 unsigned long *scratch = (unsigned long *)alloca(total_allocation);
3255
3256 // Local scratch arrays
3257 unsigned long
3258 *a = scratch + 0 * longwords,
3259 *n = scratch + 1 * longwords,
3260 *m = scratch + 2 * longwords;
3261
3262 reverse_words((unsigned long *)a_ints, a, longwords);
3263 reverse_words((unsigned long *)n_ints, n, longwords);
3264
3265 if (len >= MONTGOMERY_SQUARING_THRESHOLD) {
3266 ::montgomery_square(a, n, m, (unsigned long)inv, longwords);
3267 } else {
3268 ::montgomery_multiply(a, a, n, m, (unsigned long)inv, longwords);
3269 }
3270
3271 reverse_words(m, (unsigned long *)m_ints, longwords);
3272 }
3273
3274 #ifdef COMPILER2
3275 RuntimeStub* SharedRuntime::make_native_invoker(address call_target,
3276 int shadow_space_bytes,
3277 const GrowableArray<VMReg>& input_registers,
3278 const GrowableArray<VMReg>& output_registers) {
3279 Unimplemented();
3280 return nullptr;
3281 }
3282 #endif