1 /*
2 * Copyright (c) 2016, 2024, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2016, 2024 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/vtableStubs.hpp"
30 #include "code/compiledIC.hpp"
31 #include "compiler/oopMap.hpp"
32 #include "gc/shared/barrierSetAssembler.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 "nativeInst_s390.hpp"
38 #include "oops/klass.inline.hpp"
39 #include "prims/methodHandles.hpp"
40 #include "registerSaver_s390.hpp"
41 #include "runtime/jniHandles.hpp"
42 #include "runtime/safepointMechanism.hpp"
43 #include "runtime/sharedRuntime.hpp"
44 #include "runtime/signature.hpp"
45 #include "runtime/stubRoutines.hpp"
46 #include "runtime/vframeArray.hpp"
47 #include "utilities/align.hpp"
48 #include "utilities/macros.hpp"
49 #include "vmreg_s390.inline.hpp"
50 #ifdef COMPILER1
51 #include "c1/c1_Runtime1.hpp"
52 #endif
53 #ifdef COMPILER2
54 #include "opto/ad.hpp"
55 #include "opto/runtime.hpp"
56 #endif
57
58 #ifdef PRODUCT
59 #define __ masm->
60 #else
61 #define __ (Verbose ? (masm->block_comment(FILE_AND_LINE),masm):masm)->
62 #endif
63
64 #define BLOCK_COMMENT(str) __ block_comment(str)
65 #define BIND(label) bind(label); BLOCK_COMMENT(#label ":")
66
67 #define RegisterSaver_LiveIntReg(regname) \
68 { RegisterSaver::int_reg, regname->encoding(), regname->as_VMReg() }
69
70 #define RegisterSaver_LiveFloatReg(regname) \
71 { RegisterSaver::float_reg, regname->encoding(), regname->as_VMReg() }
72
73 // Registers which are not saved/restored, but still they have got a frame slot.
74 // Used to get same frame size for RegisterSaver_LiveRegs and RegisterSaver_LiveRegsWithoutR2
75 #define RegisterSaver_ExcludedIntReg(regname) \
76 { RegisterSaver::excluded_reg, regname->encoding(), regname->as_VMReg() }
77
78 // Registers which are not saved/restored, but still they have got a frame slot.
79 // Used to get same frame size for RegisterSaver_LiveRegs and RegisterSaver_LiveRegsWithoutR2.
80 #define RegisterSaver_ExcludedFloatReg(regname) \
81 { RegisterSaver::excluded_reg, regname->encoding(), regname->as_VMReg() }
82
83 static const RegisterSaver::LiveRegType RegisterSaver_LiveRegs[] = {
84 // Live registers which get spilled to the stack. Register positions
85 // in this array correspond directly to the stack layout.
86 //
87 // live float registers:
88 //
89 RegisterSaver_LiveFloatReg(Z_F0 ),
90 // RegisterSaver_ExcludedFloatReg(Z_F1 ), // scratch (Z_fscratch_1)
91 RegisterSaver_LiveFloatReg(Z_F2 ),
92 RegisterSaver_LiveFloatReg(Z_F3 ),
93 RegisterSaver_LiveFloatReg(Z_F4 ),
94 RegisterSaver_LiveFloatReg(Z_F5 ),
95 RegisterSaver_LiveFloatReg(Z_F6 ),
96 RegisterSaver_LiveFloatReg(Z_F7 ),
97 RegisterSaver_LiveFloatReg(Z_F8 ),
98 RegisterSaver_LiveFloatReg(Z_F9 ),
99 RegisterSaver_LiveFloatReg(Z_F10),
100 RegisterSaver_LiveFloatReg(Z_F11),
101 RegisterSaver_LiveFloatReg(Z_F12),
102 RegisterSaver_LiveFloatReg(Z_F13),
103 RegisterSaver_LiveFloatReg(Z_F14),
104 RegisterSaver_LiveFloatReg(Z_F15),
105 //
106 // RegisterSaver_ExcludedIntReg(Z_R0), // scratch
107 // RegisterSaver_ExcludedIntReg(Z_R1), // scratch
108 RegisterSaver_LiveIntReg(Z_R2 ),
109 RegisterSaver_LiveIntReg(Z_R3 ),
110 RegisterSaver_LiveIntReg(Z_R4 ),
111 RegisterSaver_LiveIntReg(Z_R5 ),
112 RegisterSaver_LiveIntReg(Z_R6 ),
113 RegisterSaver_LiveIntReg(Z_R7 ),
114 RegisterSaver_LiveIntReg(Z_R8 ),
115 RegisterSaver_LiveIntReg(Z_R9 ),
116 RegisterSaver_LiveIntReg(Z_R10),
117 RegisterSaver_LiveIntReg(Z_R11),
118 RegisterSaver_LiveIntReg(Z_R12),
119 RegisterSaver_LiveIntReg(Z_R13),
120 // RegisterSaver_ExcludedIntReg(Z_R14), // return pc (Saved in caller frame.)
121 // RegisterSaver_ExcludedIntReg(Z_R15) // stack pointer
122 };
123
124 static const RegisterSaver::LiveRegType RegisterSaver_LiveIntRegs[] = {
125 // Live registers which get spilled to the stack. Register positions
126 // in this array correspond directly to the stack layout.
127 //
128 // live float registers: All excluded, but still they get a stack slot to get same frame size.
129 //
130 RegisterSaver_ExcludedFloatReg(Z_F0 ),
131 // RegisterSaver_ExcludedFloatReg(Z_F1 ), // scratch (Z_fscratch_1)
132 RegisterSaver_ExcludedFloatReg(Z_F2 ),
133 RegisterSaver_ExcludedFloatReg(Z_F3 ),
134 RegisterSaver_ExcludedFloatReg(Z_F4 ),
135 RegisterSaver_ExcludedFloatReg(Z_F5 ),
136 RegisterSaver_ExcludedFloatReg(Z_F6 ),
137 RegisterSaver_ExcludedFloatReg(Z_F7 ),
138 RegisterSaver_ExcludedFloatReg(Z_F8 ),
139 RegisterSaver_ExcludedFloatReg(Z_F9 ),
140 RegisterSaver_ExcludedFloatReg(Z_F10),
141 RegisterSaver_ExcludedFloatReg(Z_F11),
142 RegisterSaver_ExcludedFloatReg(Z_F12),
143 RegisterSaver_ExcludedFloatReg(Z_F13),
144 RegisterSaver_ExcludedFloatReg(Z_F14),
145 RegisterSaver_ExcludedFloatReg(Z_F15),
146 //
147 // RegisterSaver_ExcludedIntReg(Z_R0), // scratch
148 // RegisterSaver_ExcludedIntReg(Z_R1), // scratch
149 RegisterSaver_LiveIntReg(Z_R2 ),
150 RegisterSaver_LiveIntReg(Z_R3 ),
151 RegisterSaver_LiveIntReg(Z_R4 ),
152 RegisterSaver_LiveIntReg(Z_R5 ),
153 RegisterSaver_LiveIntReg(Z_R6 ),
154 RegisterSaver_LiveIntReg(Z_R7 ),
155 RegisterSaver_LiveIntReg(Z_R8 ),
156 RegisterSaver_LiveIntReg(Z_R9 ),
157 RegisterSaver_LiveIntReg(Z_R10),
158 RegisterSaver_LiveIntReg(Z_R11),
159 RegisterSaver_LiveIntReg(Z_R12),
160 RegisterSaver_LiveIntReg(Z_R13),
161 // RegisterSaver_ExcludedIntReg(Z_R14), // return pc (Saved in caller frame.)
162 // RegisterSaver_ExcludedIntReg(Z_R15) // stack pointer
163 };
164
165 static const RegisterSaver::LiveRegType RegisterSaver_LiveRegsWithoutR2[] = {
166 // Live registers which get spilled to the stack. Register positions
167 // in this array correspond directly to the stack layout.
168 //
169 // live float registers:
170 //
171 RegisterSaver_LiveFloatReg(Z_F0 ),
172 // RegisterSaver_ExcludedFloatReg(Z_F1 ), // scratch (Z_fscratch_1)
173 RegisterSaver_LiveFloatReg(Z_F2 ),
174 RegisterSaver_LiveFloatReg(Z_F3 ),
175 RegisterSaver_LiveFloatReg(Z_F4 ),
176 RegisterSaver_LiveFloatReg(Z_F5 ),
177 RegisterSaver_LiveFloatReg(Z_F6 ),
178 RegisterSaver_LiveFloatReg(Z_F7 ),
179 RegisterSaver_LiveFloatReg(Z_F8 ),
180 RegisterSaver_LiveFloatReg(Z_F9 ),
181 RegisterSaver_LiveFloatReg(Z_F10),
182 RegisterSaver_LiveFloatReg(Z_F11),
183 RegisterSaver_LiveFloatReg(Z_F12),
184 RegisterSaver_LiveFloatReg(Z_F13),
185 RegisterSaver_LiveFloatReg(Z_F14),
186 RegisterSaver_LiveFloatReg(Z_F15),
187 //
188 // RegisterSaver_ExcludedIntReg(Z_R0), // scratch
189 // RegisterSaver_ExcludedIntReg(Z_R1), // scratch
190 RegisterSaver_ExcludedIntReg(Z_R2), // Omit saving R2.
191 RegisterSaver_LiveIntReg(Z_R3 ),
192 RegisterSaver_LiveIntReg(Z_R4 ),
193 RegisterSaver_LiveIntReg(Z_R5 ),
194 RegisterSaver_LiveIntReg(Z_R6 ),
195 RegisterSaver_LiveIntReg(Z_R7 ),
196 RegisterSaver_LiveIntReg(Z_R8 ),
197 RegisterSaver_LiveIntReg(Z_R9 ),
198 RegisterSaver_LiveIntReg(Z_R10),
199 RegisterSaver_LiveIntReg(Z_R11),
200 RegisterSaver_LiveIntReg(Z_R12),
201 RegisterSaver_LiveIntReg(Z_R13),
202 // RegisterSaver_ExcludedIntReg(Z_R14), // return pc (Saved in caller frame.)
203 // RegisterSaver_ExcludedIntReg(Z_R15) // stack pointer
204 };
205
206 // Live argument registers which get spilled to the stack.
207 static const RegisterSaver::LiveRegType RegisterSaver_LiveArgRegs[] = {
208 RegisterSaver_LiveFloatReg(Z_FARG1),
209 RegisterSaver_LiveFloatReg(Z_FARG2),
210 RegisterSaver_LiveFloatReg(Z_FARG3),
211 RegisterSaver_LiveFloatReg(Z_FARG4),
212 RegisterSaver_LiveIntReg(Z_ARG1),
213 RegisterSaver_LiveIntReg(Z_ARG2),
214 RegisterSaver_LiveIntReg(Z_ARG3),
215 RegisterSaver_LiveIntReg(Z_ARG4),
216 RegisterSaver_LiveIntReg(Z_ARG5)
217 };
218
219 static const RegisterSaver::LiveRegType RegisterSaver_LiveVolatileRegs[] = {
220 // Live registers which get spilled to the stack. Register positions
221 // in this array correspond directly to the stack layout.
222 //
223 // live float registers:
224 //
225 RegisterSaver_LiveFloatReg(Z_F0 ),
226 // RegisterSaver_ExcludedFloatReg(Z_F1 ), // scratch (Z_fscratch_1)
227 RegisterSaver_LiveFloatReg(Z_F2 ),
228 RegisterSaver_LiveFloatReg(Z_F3 ),
229 RegisterSaver_LiveFloatReg(Z_F4 ),
230 RegisterSaver_LiveFloatReg(Z_F5 ),
231 RegisterSaver_LiveFloatReg(Z_F6 ),
232 RegisterSaver_LiveFloatReg(Z_F7 ),
233 // RegisterSaver_LiveFloatReg(Z_F8 ), // non-volatile
234 // RegisterSaver_LiveFloatReg(Z_F9 ), // non-volatile
235 // RegisterSaver_LiveFloatReg(Z_F10), // non-volatile
236 // RegisterSaver_LiveFloatReg(Z_F11), // non-volatile
237 // RegisterSaver_LiveFloatReg(Z_F12), // non-volatile
238 // RegisterSaver_LiveFloatReg(Z_F13), // non-volatile
239 // RegisterSaver_LiveFloatReg(Z_F14), // non-volatile
240 // RegisterSaver_LiveFloatReg(Z_F15), // non-volatile
241 //
242 // RegisterSaver_ExcludedIntReg(Z_R0), // scratch
243 // RegisterSaver_ExcludedIntReg(Z_R1), // scratch
244 RegisterSaver_LiveIntReg(Z_R2 ),
245 RegisterSaver_LiveIntReg(Z_R3 ),
246 RegisterSaver_LiveIntReg(Z_R4 ),
247 RegisterSaver_LiveIntReg(Z_R5 ),
248 // RegisterSaver_LiveIntReg(Z_R6 ), // non-volatile
249 // RegisterSaver_LiveIntReg(Z_R7 ), // non-volatile
250 // RegisterSaver_LiveIntReg(Z_R8 ), // non-volatile
251 // RegisterSaver_LiveIntReg(Z_R9 ), // non-volatile
252 // RegisterSaver_LiveIntReg(Z_R10), // non-volatile
253 // RegisterSaver_LiveIntReg(Z_R11), // non-volatile
254 // RegisterSaver_LiveIntReg(Z_R12), // non-volatile
255 // RegisterSaver_LiveIntReg(Z_R13), // non-volatile
256 // RegisterSaver_ExcludedIntReg(Z_R14), // return pc (Saved in caller frame.)
257 // RegisterSaver_ExcludedIntReg(Z_R15) // stack pointer
258 };
259
260 int RegisterSaver::live_reg_save_size(RegisterSet reg_set) {
261 int reg_space = -1;
262 switch (reg_set) {
263 case all_registers: reg_space = sizeof(RegisterSaver_LiveRegs); break;
264 case all_registers_except_r2: reg_space = sizeof(RegisterSaver_LiveRegsWithoutR2); break;
265 case all_integer_registers: reg_space = sizeof(RegisterSaver_LiveIntRegs); break;
266 case all_volatile_registers: reg_space = sizeof(RegisterSaver_LiveVolatileRegs); break;
267 case arg_registers: reg_space = sizeof(RegisterSaver_LiveArgRegs); break;
268 default: ShouldNotReachHere();
269 }
270 return (reg_space / sizeof(RegisterSaver::LiveRegType)) * reg_size;
271 }
272
273
274 int RegisterSaver::live_reg_frame_size(RegisterSet reg_set) {
275 return live_reg_save_size(reg_set) + frame::z_abi_160_size;
276 }
277
278
279 // return_pc: Specify the register that should be stored as the return pc in the current frame.
280 OopMap* RegisterSaver::save_live_registers(MacroAssembler* masm, RegisterSet reg_set, Register return_pc) {
281 // Record volatile registers as callee-save values in an OopMap so
282 // their save locations will be propagated to the caller frame's
283 // RegisterMap during StackFrameStream construction (needed for
284 // deoptimization; see compiledVFrame::create_stack_value).
285
286 // Calculate frame size.
287 const int frame_size_in_bytes = live_reg_frame_size(reg_set);
288 const int frame_size_in_slots = frame_size_in_bytes / sizeof(jint);
289 const int register_save_offset = frame_size_in_bytes - live_reg_save_size(reg_set);
290
291 // OopMap frame size is in c2 stack slots (sizeof(jint)) not bytes or words.
292 OopMap* map = new OopMap(frame_size_in_slots, 0);
293
294 int regstosave_num = 0;
295 const RegisterSaver::LiveRegType* live_regs = nullptr;
296
297 switch (reg_set) {
298 case all_registers:
299 regstosave_num = sizeof(RegisterSaver_LiveRegs)/sizeof(RegisterSaver::LiveRegType);
300 live_regs = RegisterSaver_LiveRegs;
301 break;
302 case all_registers_except_r2:
303 regstosave_num = sizeof(RegisterSaver_LiveRegsWithoutR2)/sizeof(RegisterSaver::LiveRegType);;
304 live_regs = RegisterSaver_LiveRegsWithoutR2;
305 break;
306 case all_integer_registers:
307 regstosave_num = sizeof(RegisterSaver_LiveIntRegs)/sizeof(RegisterSaver::LiveRegType);
308 live_regs = RegisterSaver_LiveIntRegs;
309 break;
310 case all_volatile_registers:
311 regstosave_num = sizeof(RegisterSaver_LiveVolatileRegs)/sizeof(RegisterSaver::LiveRegType);
312 live_regs = RegisterSaver_LiveVolatileRegs;
313 break;
314 case arg_registers:
315 regstosave_num = sizeof(RegisterSaver_LiveArgRegs)/sizeof(RegisterSaver::LiveRegType);;
316 live_regs = RegisterSaver_LiveArgRegs;
317 break;
318 default: ShouldNotReachHere();
319 }
320
321 // Save return pc in old frame.
322 __ save_return_pc(return_pc);
323
324 // Push a new frame (includes stack linkage).
325 // Use return_pc as scratch for push_frame. Z_R0_scratch (the default) and Z_R1_scratch are
326 // illegally used to pass parameters by RangeCheckStub::emit_code().
327 __ push_frame(frame_size_in_bytes, return_pc);
328 // We have to restore return_pc right away.
329 // Nobody else will. Furthermore, return_pc isn't necessarily the default (Z_R14).
330 // Nobody else knows which register we saved.
331 __ z_lg(return_pc, _z_common_abi(return_pc) + frame_size_in_bytes, Z_SP);
332
333 // Register save area in new frame starts above z_abi_160 area.
334 int offset = register_save_offset;
335
336 Register first = noreg;
337 Register last = noreg;
338 int first_offset = -1;
339 bool float_spilled = false;
340
341 for (int i = 0; i < regstosave_num; i++, offset += reg_size) {
342 int reg_num = live_regs[i].reg_num;
343 int reg_type = live_regs[i].reg_type;
344
345 switch (reg_type) {
346 case RegisterSaver::int_reg: {
347 Register reg = as_Register(reg_num);
348 if (last != reg->predecessor()) {
349 if (first != noreg) {
350 __ z_stmg(first, last, first_offset, Z_SP);
351 }
352 first = reg;
353 first_offset = offset;
354 DEBUG_ONLY(float_spilled = false);
355 }
356 last = reg;
357 assert(last != Z_R0, "r0 would require special treatment");
358 assert(!float_spilled, "for simplicity, do not mix up ints and floats in RegisterSaver_LiveRegs[]");
359 break;
360 }
361
362 case RegisterSaver::excluded_reg: // Not saved/restored, but with dedicated slot.
363 continue; // Continue with next loop iteration.
364
365 case RegisterSaver::float_reg: {
366 FloatRegister freg = as_FloatRegister(reg_num);
367 __ z_std(freg, offset, Z_SP);
368 DEBUG_ONLY(float_spilled = true);
369 break;
370 }
371
372 default:
373 ShouldNotReachHere();
374 break;
375 }
376
377 // Second set_callee_saved is really a waste but we'll keep things as they were for now
378 map->set_callee_saved(VMRegImpl::stack2reg(offset >> 2), live_regs[i].vmreg);
379 map->set_callee_saved(VMRegImpl::stack2reg((offset + half_reg_size) >> 2), live_regs[i].vmreg->next());
380 }
381 assert(first != noreg, "Should spill at least one int reg.");
382 __ z_stmg(first, last, first_offset, Z_SP);
383
384 // And we're done.
385 return map;
386 }
387
388
389 // Generate the OopMap (again, regs where saved before).
390 OopMap* RegisterSaver::generate_oop_map(MacroAssembler* masm, RegisterSet reg_set) {
391 // Calculate frame size.
392 const int frame_size_in_bytes = live_reg_frame_size(reg_set);
393 const int frame_size_in_slots = frame_size_in_bytes / sizeof(jint);
394 const int register_save_offset = frame_size_in_bytes - live_reg_save_size(reg_set);
395
396 // OopMap frame size is in c2 stack slots (sizeof(jint)) not bytes or words.
397 OopMap* map = new OopMap(frame_size_in_slots, 0);
398
399 int regstosave_num = 0;
400 const RegisterSaver::LiveRegType* live_regs = nullptr;
401
402 switch (reg_set) {
403 case all_registers:
404 regstosave_num = sizeof(RegisterSaver_LiveRegs)/sizeof(RegisterSaver::LiveRegType);
405 live_regs = RegisterSaver_LiveRegs;
406 break;
407 case all_registers_except_r2:
408 regstosave_num = sizeof(RegisterSaver_LiveRegsWithoutR2)/sizeof(RegisterSaver::LiveRegType);;
409 live_regs = RegisterSaver_LiveRegsWithoutR2;
410 break;
411 case all_integer_registers:
412 regstosave_num = sizeof(RegisterSaver_LiveIntRegs)/sizeof(RegisterSaver::LiveRegType);
413 live_regs = RegisterSaver_LiveIntRegs;
414 break;
415 case all_volatile_registers:
416 regstosave_num = sizeof(RegisterSaver_LiveVolatileRegs)/sizeof(RegisterSaver::LiveRegType);
417 live_regs = RegisterSaver_LiveVolatileRegs;
418 break;
419 case arg_registers:
420 regstosave_num = sizeof(RegisterSaver_LiveArgRegs)/sizeof(RegisterSaver::LiveRegType);;
421 live_regs = RegisterSaver_LiveArgRegs;
422 break;
423 default: ShouldNotReachHere();
424 }
425
426 // Register save area in new frame starts above z_abi_160 area.
427 int offset = register_save_offset;
428 for (int i = 0; i < regstosave_num; i++) {
429 if (live_regs[i].reg_type < RegisterSaver::excluded_reg) {
430 map->set_callee_saved(VMRegImpl::stack2reg(offset>>2), live_regs[i].vmreg);
431 map->set_callee_saved(VMRegImpl::stack2reg((offset + half_reg_size)>>2), live_regs[i].vmreg->next());
432 }
433 offset += reg_size;
434 }
435 return map;
436 }
437
438
439 // Pop the current frame and restore all the registers that we saved.
440 void RegisterSaver::restore_live_registers(MacroAssembler* masm, RegisterSet reg_set) {
441 int offset;
442 const int register_save_offset = live_reg_frame_size(reg_set) - live_reg_save_size(reg_set);
443
444 Register first = noreg;
445 Register last = noreg;
446 int first_offset = -1;
447 bool float_spilled = false;
448
449 int regstosave_num = 0;
450 const RegisterSaver::LiveRegType* live_regs = nullptr;
451
452 switch (reg_set) {
453 case all_registers:
454 regstosave_num = sizeof(RegisterSaver_LiveRegs)/sizeof(RegisterSaver::LiveRegType);;
455 live_regs = RegisterSaver_LiveRegs;
456 break;
457 case all_registers_except_r2:
458 regstosave_num = sizeof(RegisterSaver_LiveRegsWithoutR2)/sizeof(RegisterSaver::LiveRegType);;
459 live_regs = RegisterSaver_LiveRegsWithoutR2;
460 break;
461 case all_integer_registers:
462 regstosave_num = sizeof(RegisterSaver_LiveIntRegs)/sizeof(RegisterSaver::LiveRegType);
463 live_regs = RegisterSaver_LiveIntRegs;
464 break;
465 case all_volatile_registers:
466 regstosave_num = sizeof(RegisterSaver_LiveVolatileRegs)/sizeof(RegisterSaver::LiveRegType);;
467 live_regs = RegisterSaver_LiveVolatileRegs;
468 break;
469 case arg_registers:
470 regstosave_num = sizeof(RegisterSaver_LiveArgRegs)/sizeof(RegisterSaver::LiveRegType);;
471 live_regs = RegisterSaver_LiveArgRegs;
472 break;
473 default: ShouldNotReachHere();
474 }
475
476 // Restore all registers (ints and floats).
477
478 // Register save area in new frame starts above z_abi_160 area.
479 offset = register_save_offset;
480
481 for (int i = 0; i < regstosave_num; i++, offset += reg_size) {
482 int reg_num = live_regs[i].reg_num;
483 int reg_type = live_regs[i].reg_type;
484
485 switch (reg_type) {
486 case RegisterSaver::excluded_reg:
487 continue; // Continue with next loop iteration.
488
489 case RegisterSaver::int_reg: {
490 Register reg = as_Register(reg_num);
491 if (last != reg->predecessor()) {
492 if (first != noreg) {
493 __ z_lmg(first, last, first_offset, Z_SP);
494 }
495 first = reg;
496 first_offset = offset;
497 DEBUG_ONLY(float_spilled = false);
498 }
499 last = reg;
500 assert(last != Z_R0, "r0 would require special treatment");
501 assert(!float_spilled, "for simplicity, do not mix up ints and floats in RegisterSaver_LiveRegs[]");
502 break;
503 }
504
505 case RegisterSaver::float_reg: {
506 FloatRegister freg = as_FloatRegister(reg_num);
507 __ z_ld(freg, offset, Z_SP);
508 DEBUG_ONLY(float_spilled = true);
509 break;
510 }
511
512 default:
513 ShouldNotReachHere();
514 }
515 }
516 assert(first != noreg, "Should spill at least one int reg.");
517 __ z_lmg(first, last, first_offset, Z_SP);
518
519 // Pop the frame.
520 __ pop_frame();
521
522 // Restore the flags.
523 __ restore_return_pc();
524 }
525
526
527 // Pop the current frame and restore the registers that might be holding a result.
528 void RegisterSaver::restore_result_registers(MacroAssembler* masm) {
529 int i;
530 int offset;
531 const int regstosave_num = sizeof(RegisterSaver_LiveRegs) /
532 sizeof(RegisterSaver::LiveRegType);
533 const int register_save_offset = live_reg_frame_size(all_registers) - live_reg_save_size(all_registers);
534
535 // Restore all result registers (ints and floats).
536 offset = register_save_offset;
537 for (int i = 0; i < regstosave_num; i++, offset += reg_size) {
538 int reg_num = RegisterSaver_LiveRegs[i].reg_num;
539 int reg_type = RegisterSaver_LiveRegs[i].reg_type;
540 switch (reg_type) {
541 case RegisterSaver::excluded_reg:
542 continue; // Continue with next loop iteration.
543 case RegisterSaver::int_reg: {
544 if (as_Register(reg_num) == Z_RET) { // int result_reg
545 __ z_lg(as_Register(reg_num), offset, Z_SP);
546 }
547 break;
548 }
549 case RegisterSaver::float_reg: {
550 if (as_FloatRegister(reg_num) == Z_FRET) { // float result_reg
551 __ z_ld(as_FloatRegister(reg_num), offset, Z_SP);
552 }
553 break;
554 }
555 default:
556 ShouldNotReachHere();
557 }
558 }
559 }
560
561 // ---------------------------------------------------------------------------
562 void SharedRuntime::save_native_result(MacroAssembler * masm,
563 BasicType ret_type,
564 int frame_slots) {
565 Address memaddr(Z_SP, frame_slots * VMRegImpl::stack_slot_size);
566
567 switch (ret_type) {
568 case T_BOOLEAN: // Save shorter types as int. Do we need sign extension at restore??
569 case T_BYTE:
570 case T_CHAR:
571 case T_SHORT:
572 case T_INT:
573 __ reg2mem_opt(Z_RET, memaddr, false);
574 break;
575 case T_OBJECT: // Save pointer types as long.
576 case T_ARRAY:
577 case T_ADDRESS:
578 case T_VOID:
579 case T_LONG:
580 __ reg2mem_opt(Z_RET, memaddr);
581 break;
582 case T_FLOAT:
583 __ freg2mem_opt(Z_FRET, memaddr, false);
584 break;
585 case T_DOUBLE:
586 __ freg2mem_opt(Z_FRET, memaddr);
587 break;
588 default:
589 ShouldNotReachHere();
590 break;
591 }
592 }
593
594 void SharedRuntime::restore_native_result(MacroAssembler *masm,
595 BasicType ret_type,
596 int frame_slots) {
597 Address memaddr(Z_SP, frame_slots * VMRegImpl::stack_slot_size);
598
599 switch (ret_type) {
600 case T_BOOLEAN: // Restore shorter types as int. Do we need sign extension at restore??
601 case T_BYTE:
602 case T_CHAR:
603 case T_SHORT:
604 case T_INT:
605 __ mem2reg_opt(Z_RET, memaddr, false);
606 break;
607 case T_OBJECT: // Restore pointer types as long.
608 case T_ARRAY:
609 case T_ADDRESS:
610 case T_VOID:
611 case T_LONG:
612 __ mem2reg_opt(Z_RET, memaddr);
613 break;
614 case T_FLOAT:
615 __ mem2freg_opt(Z_FRET, memaddr, false);
616 break;
617 case T_DOUBLE:
618 __ mem2freg_opt(Z_FRET, memaddr);
619 break;
620 default:
621 ShouldNotReachHere();
622 break;
623 }
624 }
625
626 // ---------------------------------------------------------------------------
627 // Read the array of BasicTypes from a signature, and compute where the
628 // arguments should go. Values in the VMRegPair regs array refer to 4-byte
629 // quantities. Values less than VMRegImpl::stack0 are registers, those above
630 // refer to 4-byte stack slots. All stack slots are based off of the stack pointer
631 // as framesizes are fixed.
632 // VMRegImpl::stack0 refers to the first slot 0(sp).
633 // VMRegImpl::stack0+1 refers to the memory word 4-byes higher. Registers
634 // up to Register::number_of_registers are the 64-bit integer registers.
635
636 // Note: the INPUTS in sig_bt are in units of Java argument words, which are
637 // either 32-bit or 64-bit depending on the build. The OUTPUTS are in 32-bit
638 // units regardless of build.
639
640 // The Java calling convention is a "shifted" version of the C ABI.
641 // By skipping the first C ABI register we can call non-static jni methods
642 // with small numbers of arguments without having to shuffle the arguments
643 // at all. Since we control the java ABI we ought to at least get some
644 // advantage out of it.
645 int SharedRuntime::java_calling_convention(const BasicType *sig_bt,
646 VMRegPair *regs,
647 int total_args_passed) {
648 // c2c calling conventions for compiled-compiled calls.
649
650 // An int/float occupies 1 slot here.
651 const int inc_stk_for_intfloat = 1; // 1 slots for ints and floats.
652 const int inc_stk_for_longdouble = 2; // 2 slots for longs and doubles.
653
654 const VMReg z_iarg_reg[5] = {
655 Z_R2->as_VMReg(),
656 Z_R3->as_VMReg(),
657 Z_R4->as_VMReg(),
658 Z_R5->as_VMReg(),
659 Z_R6->as_VMReg()
660 };
661 const VMReg z_farg_reg[4] = {
662 Z_F0->as_VMReg(),
663 Z_F2->as_VMReg(),
664 Z_F4->as_VMReg(),
665 Z_F6->as_VMReg()
666 };
667 const int z_num_iarg_registers = sizeof(z_iarg_reg) / sizeof(z_iarg_reg[0]);
668 const int z_num_farg_registers = sizeof(z_farg_reg) / sizeof(z_farg_reg[0]);
669
670 assert(Register::number_of_arg_registers == z_num_iarg_registers, "iarg reg count mismatch");
671 assert(FloatRegister::number_of_arg_registers == z_num_farg_registers, "farg reg count mismatch");
672
673 int i;
674 int stk = 0;
675 int ireg = 0;
676 int freg = 0;
677
678 for (int i = 0; i < total_args_passed; ++i) {
679 switch (sig_bt[i]) {
680 case T_BOOLEAN:
681 case T_CHAR:
682 case T_BYTE:
683 case T_SHORT:
684 case T_INT:
685 if (ireg < z_num_iarg_registers) {
686 // Put int/ptr in register.
687 regs[i].set1(z_iarg_reg[ireg]);
688 ++ireg;
689 } else {
690 // Put int/ptr on stack.
691 regs[i].set1(VMRegImpl::stack2reg(stk));
692 stk += inc_stk_for_intfloat;
693 }
694 break;
695 case T_LONG:
696 assert((i + 1) < total_args_passed && sig_bt[i+1] == T_VOID, "expecting half");
697 if (ireg < z_num_iarg_registers) {
698 // Put long in register.
699 regs[i].set2(z_iarg_reg[ireg]);
700 ++ireg;
701 } else {
702 // Put long on stack and align to 2 slots.
703 if (stk & 0x1) { ++stk; }
704 regs[i].set2(VMRegImpl::stack2reg(stk));
705 stk += inc_stk_for_longdouble;
706 }
707 break;
708 case T_OBJECT:
709 case T_ARRAY:
710 case T_ADDRESS:
711 if (ireg < z_num_iarg_registers) {
712 // Put ptr in register.
713 regs[i].set2(z_iarg_reg[ireg]);
714 ++ireg;
715 } else {
716 // Put ptr on stack and align to 2 slots, because
717 // "64-bit pointers record oop-ishness on 2 aligned adjacent
718 // registers." (see OopFlow::build_oop_map).
719 if (stk & 0x1) { ++stk; }
720 regs[i].set2(VMRegImpl::stack2reg(stk));
721 stk += inc_stk_for_longdouble;
722 }
723 break;
724 case T_FLOAT:
725 if (freg < z_num_farg_registers) {
726 // Put float in register.
727 regs[i].set1(z_farg_reg[freg]);
728 ++freg;
729 } else {
730 // Put float on stack.
731 regs[i].set1(VMRegImpl::stack2reg(stk));
732 stk += inc_stk_for_intfloat;
733 }
734 break;
735 case T_DOUBLE:
736 assert((i + 1) < total_args_passed && sig_bt[i+1] == T_VOID, "expecting half");
737 if (freg < z_num_farg_registers) {
738 // Put double in register.
739 regs[i].set2(z_farg_reg[freg]);
740 ++freg;
741 } else {
742 // Put double on stack and align to 2 slots.
743 if (stk & 0x1) { ++stk; }
744 regs[i].set2(VMRegImpl::stack2reg(stk));
745 stk += inc_stk_for_longdouble;
746 }
747 break;
748 case T_VOID:
749 assert(i != 0 && (sig_bt[i - 1] == T_LONG || sig_bt[i - 1] == T_DOUBLE), "expecting half");
750 // Do not count halves.
751 regs[i].set_bad();
752 break;
753 default:
754 ShouldNotReachHere();
755 }
756 }
757 return stk;
758 }
759
760 int SharedRuntime::c_calling_convention(const BasicType *sig_bt,
761 VMRegPair *regs,
762 int total_args_passed) {
763
764 // Calling conventions for C runtime calls and calls to JNI native methods.
765 const VMReg z_iarg_reg[5] = {
766 Z_R2->as_VMReg(),
767 Z_R3->as_VMReg(),
768 Z_R4->as_VMReg(),
769 Z_R5->as_VMReg(),
770 Z_R6->as_VMReg()
771 };
772 const VMReg z_farg_reg[4] = {
773 Z_F0->as_VMReg(),
774 Z_F2->as_VMReg(),
775 Z_F4->as_VMReg(),
776 Z_F6->as_VMReg()
777 };
778 const int z_num_iarg_registers = sizeof(z_iarg_reg) / sizeof(z_iarg_reg[0]);
779 const int z_num_farg_registers = sizeof(z_farg_reg) / sizeof(z_farg_reg[0]);
780
781 // Check calling conventions consistency.
782 assert(Register::number_of_arg_registers == z_num_iarg_registers, "iarg reg count mismatch");
783 assert(FloatRegister::number_of_arg_registers == z_num_farg_registers, "farg reg count mismatch");
784
785 // Avoid passing C arguments in the wrong stack slots.
786
787 // 'Stk' counts stack slots. Due to alignment, 32 bit values occupy
788 // 2 such slots, like 64 bit values do.
789 const int inc_stk_for_intfloat = 2; // 2 slots for ints and floats.
790 const int inc_stk_for_longdouble = 2; // 2 slots for longs and doubles.
791
792 int i;
793 // Leave room for C-compatible ABI
794 int stk = (frame::z_abi_160_size - frame::z_jit_out_preserve_size) / VMRegImpl::stack_slot_size;
795 int freg = 0;
796 int ireg = 0;
797
798 // We put the first 5 arguments into registers and the rest on the
799 // stack. Float arguments are already in their argument registers
800 // due to c2c calling conventions (see calling_convention).
801 for (int i = 0; i < total_args_passed; ++i) {
802 switch (sig_bt[i]) {
803 case T_BOOLEAN:
804 case T_CHAR:
805 case T_BYTE:
806 case T_SHORT:
807 case T_INT:
808 // Fall through, handle as long.
809 case T_LONG:
810 case T_OBJECT:
811 case T_ARRAY:
812 case T_ADDRESS:
813 case T_METADATA:
814 // Oops are already boxed if required (JNI).
815 if (ireg < z_num_iarg_registers) {
816 regs[i].set2(z_iarg_reg[ireg]);
817 ++ireg;
818 } else {
819 regs[i].set2(VMRegImpl::stack2reg(stk));
820 stk += inc_stk_for_longdouble;
821 }
822 break;
823 case T_FLOAT:
824 if (freg < z_num_farg_registers) {
825 regs[i].set1(z_farg_reg[freg]);
826 ++freg;
827 } else {
828 regs[i].set1(VMRegImpl::stack2reg(stk+1));
829 stk += inc_stk_for_intfloat;
830 }
831 break;
832 case T_DOUBLE:
833 assert((i + 1) < total_args_passed && sig_bt[i+1] == T_VOID, "expecting half");
834 if (freg < z_num_farg_registers) {
835 regs[i].set2(z_farg_reg[freg]);
836 ++freg;
837 } else {
838 // Put double on stack.
839 regs[i].set2(VMRegImpl::stack2reg(stk));
840 stk += inc_stk_for_longdouble;
841 }
842 break;
843 case T_VOID:
844 // Do not count halves.
845 regs[i].set_bad();
846 break;
847 default:
848 ShouldNotReachHere();
849 }
850 }
851 return align_up(stk, 2);
852 }
853
854 int SharedRuntime::vector_calling_convention(VMRegPair *regs,
855 uint num_bits,
856 uint total_args_passed) {
857 Unimplemented();
858 return 0;
859 }
860
861 ////////////////////////////////////////////////////////////////////////
862 //
863 // Argument shufflers
864 //
865 ////////////////////////////////////////////////////////////////////////
866
867 //----------------------------------------------------------------------
868 // The java_calling_convention describes stack locations as ideal slots on
869 // a frame with no abi restrictions. Since we must observe abi restrictions
870 // (like the placement of the register window) the slots must be biased by
871 // the following value.
872 //----------------------------------------------------------------------
873 static int reg2slot(VMReg r) {
874 return r->reg2stack() + SharedRuntime::out_preserve_stack_slots();
875 }
876
877 static int reg2offset(VMReg r) {
878 return reg2slot(r) * VMRegImpl::stack_slot_size;
879 }
880
881 static void verify_oop_args(MacroAssembler *masm,
882 int total_args_passed,
883 const BasicType *sig_bt,
884 const VMRegPair *regs) {
885 if (!VerifyOops) { return; }
886
887 for (int i = 0; i < total_args_passed; i++) {
888 if (is_reference_type(sig_bt[i])) {
889 VMReg r = regs[i].first();
890 assert(r->is_valid(), "bad oop arg");
891
892 if (r->is_stack()) {
893 __ z_lg(Z_R0_scratch,
894 Address(Z_SP, r->reg2stack() * VMRegImpl::stack_slot_size + wordSize));
895 __ verify_oop(Z_R0_scratch, FILE_AND_LINE);
896 } else {
897 __ verify_oop(r->as_Register(), FILE_AND_LINE);
898 }
899 }
900 }
901 }
902
903 static void gen_special_dispatch(MacroAssembler *masm,
904 int total_args_passed,
905 vmIntrinsics::ID special_dispatch,
906 const BasicType *sig_bt,
907 const VMRegPair *regs) {
908 verify_oop_args(masm, total_args_passed, sig_bt, regs);
909
910 // Now write the args into the outgoing interpreter space.
911 bool has_receiver = false;
912 Register receiver_reg = noreg;
913 int member_arg_pos = -1;
914 Register member_reg = noreg;
915 int ref_kind = MethodHandles::signature_polymorphic_intrinsic_ref_kind(special_dispatch);
916
917 if (ref_kind != 0) {
918 member_arg_pos = total_args_passed - 1; // trailing MemberName argument
919 member_reg = Z_R9; // Known to be free at this point.
920 has_receiver = MethodHandles::ref_kind_has_receiver(ref_kind);
921 } else if (special_dispatch == vmIntrinsics::_linkToNative) {
922 member_arg_pos = total_args_passed - 1; // trailing NativeEntryPoint argument
923 member_reg = Z_R9; // known to be free at this point
924 } else {
925 guarantee(special_dispatch == vmIntrinsics::_invokeBasic,
926 "special_dispatch=%d", vmIntrinsics::as_int(special_dispatch));
927 has_receiver = true;
928 }
929
930 if (member_reg != noreg) {
931 // Load the member_arg into register, if necessary.
932 assert(member_arg_pos >= 0 && member_arg_pos < total_args_passed, "oob");
933 assert(sig_bt[member_arg_pos] == T_OBJECT, "dispatch argument must be an object");
934
935 VMReg r = regs[member_arg_pos].first();
936 assert(r->is_valid(), "bad member arg");
937
938 if (r->is_stack()) {
939 __ z_lg(member_reg, Address(Z_SP, reg2offset(r)));
940 } else {
941 // No data motion is needed.
942 member_reg = r->as_Register();
943 }
944 }
945
946 if (has_receiver) {
947 // Make sure the receiver is loaded into a register.
948 assert(total_args_passed > 0, "oob");
949 assert(sig_bt[0] == T_OBJECT, "receiver argument must be an object");
950
951 VMReg r = regs[0].first();
952 assert(r->is_valid(), "bad receiver arg");
953
954 if (r->is_stack()) {
955 // Porting note: This assumes that compiled calling conventions always
956 // pass the receiver oop in a register. If this is not true on some
957 // platform, pick a temp and load the receiver from stack.
958 assert(false, "receiver always in a register");
959 receiver_reg = Z_R13; // Known to be free at this point.
960 __ z_lg(receiver_reg, Address(Z_SP, reg2offset(r)));
961 } else {
962 // No data motion is needed.
963 receiver_reg = r->as_Register();
964 }
965 }
966
967 // Figure out which address we are really jumping to:
968 MethodHandles::generate_method_handle_dispatch(masm, special_dispatch,
969 receiver_reg, member_reg,
970 /*for_compiler_entry:*/ true);
971 }
972
973 ////////////////////////////////////////////////////////////////////////
974 //
975 // Argument shufflers
976 //
977 ////////////////////////////////////////////////////////////////////////
978
979 // Is the size of a vector size (in bytes) bigger than a size saved by default?
980 // 8 bytes registers are saved by default on z/Architecture.
981 bool SharedRuntime::is_wide_vector(int size) {
982 // Note, MaxVectorSize == 8 on this platform.
983 assert(size <= 8, "%d bytes vectors are not supported", size);
984 return size > 8;
985 }
986
987 //----------------------------------------------------------------------
988 // An oop arg. Must pass a handle not the oop itself
989 //----------------------------------------------------------------------
990 static void object_move(MacroAssembler *masm,
991 OopMap *map,
992 int oop_handle_offset,
993 int framesize_in_slots,
994 VMRegPair src,
995 VMRegPair dst,
996 bool is_receiver,
997 int *receiver_offset) {
998 int frame_offset = framesize_in_slots*VMRegImpl::stack_slot_size;
999
1000 assert(!is_receiver || (is_receiver && (*receiver_offset == -1)), "only one receiving object per call, please.");
1001
1002 // Must pass a handle. First figure out the location we use as a handle.
1003
1004 if (src.first()->is_stack()) {
1005 // Oop is already on the stack, put handle on stack or in register
1006 // If handle will be on the stack, use temp reg to calculate it.
1007 Register rHandle = dst.first()->is_stack() ? Z_R1 : dst.first()->as_Register();
1008 Label skip;
1009 int slot_in_older_frame = reg2slot(src.first());
1010
1011 guarantee(!is_receiver, "expecting receiver in register");
1012 map->set_oop(VMRegImpl::stack2reg(slot_in_older_frame + framesize_in_slots));
1013
1014 __ add2reg(rHandle, reg2offset(src.first())+frame_offset, Z_SP);
1015 __ load_and_test_long(Z_R0, Address(rHandle));
1016 __ z_brne(skip);
1017 // Use a null handle if oop is null.
1018 __ clear_reg(rHandle, true, false);
1019 __ bind(skip);
1020
1021 // Copy handle to the right place (register or stack).
1022 if (dst.first()->is_stack()) {
1023 __ z_stg(rHandle, reg2offset(dst.first()), Z_SP);
1024 } // else
1025 // nothing to do. rHandle uses the correct register
1026 } else {
1027 // Oop is passed in an input register. We must flush it to the stack.
1028 const Register rOop = src.first()->as_Register();
1029 const Register rHandle = dst.first()->is_stack() ? Z_R1 : dst.first()->as_Register();
1030 int oop_slot = (rOop->encoding()-Z_ARG1->encoding()) * VMRegImpl::slots_per_word + oop_handle_offset;
1031 int oop_slot_offset = oop_slot*VMRegImpl::stack_slot_size;
1032 NearLabel skip;
1033
1034 if (is_receiver) {
1035 *receiver_offset = oop_slot_offset;
1036 }
1037 map->set_oop(VMRegImpl::stack2reg(oop_slot));
1038
1039 // Flush Oop to stack, calculate handle.
1040 __ z_stg(rOop, oop_slot_offset, Z_SP);
1041 __ add2reg(rHandle, oop_slot_offset, Z_SP);
1042
1043 // If Oop is null, use a null handle.
1044 __ compare64_and_branch(rOop, (RegisterOrConstant)0L, Assembler::bcondNotEqual, skip);
1045 __ clear_reg(rHandle, true, false);
1046 __ bind(skip);
1047
1048 // Copy handle to the right place (register or stack).
1049 if (dst.first()->is_stack()) {
1050 __ z_stg(rHandle, reg2offset(dst.first()), Z_SP);
1051 } // else
1052 // nothing to do here, since rHandle = dst.first()->as_Register in this case.
1053 }
1054 }
1055
1056 //----------------------------------------------------------------------
1057 // A float arg. May have to do float reg to int reg conversion
1058 //----------------------------------------------------------------------
1059 static void float_move(MacroAssembler *masm,
1060 VMRegPair src,
1061 VMRegPair dst,
1062 int framesize_in_slots,
1063 int workspace_slot_offset) {
1064 int frame_offset = framesize_in_slots * VMRegImpl::stack_slot_size;
1065 int workspace_offset = workspace_slot_offset * VMRegImpl::stack_slot_size;
1066
1067 // We do not accept an argument in a VMRegPair to be spread over two slots,
1068 // no matter what physical location (reg or stack) the slots may have.
1069 // We just check for the unaccepted slot to be invalid.
1070 assert(!src.second()->is_valid(), "float in arg spread over two slots");
1071 assert(!dst.second()->is_valid(), "float out arg spread over two slots");
1072
1073 if (src.first()->is_stack()) {
1074 if (dst.first()->is_stack()) {
1075 // stack -> stack. The easiest of the bunch.
1076 __ z_mvc(Address(Z_SP, reg2offset(dst.first())),
1077 Address(Z_SP, reg2offset(src.first()) + frame_offset), sizeof(float));
1078 } else {
1079 // stack to reg
1080 Address memaddr(Z_SP, reg2offset(src.first()) + frame_offset);
1081 if (dst.first()->is_Register()) {
1082 __ mem2reg_opt(dst.first()->as_Register(), memaddr, false);
1083 } else {
1084 __ mem2freg_opt(dst.first()->as_FloatRegister(), memaddr, false);
1085 }
1086 }
1087 } else if (src.first()->is_Register()) {
1088 if (dst.first()->is_stack()) {
1089 // gpr -> stack
1090 __ reg2mem_opt(src.first()->as_Register(),
1091 Address(Z_SP, reg2offset(dst.first()), false ));
1092 } else {
1093 if (dst.first()->is_Register()) {
1094 // gpr -> gpr
1095 __ move_reg_if_needed(dst.first()->as_Register(), T_INT,
1096 src.first()->as_Register(), T_INT);
1097 } else {
1098 if (VM_Version::has_FPSupportEnhancements()) {
1099 // gpr -> fpr. Exploit z10 capability of direct transfer.
1100 __ z_ldgr(dst.first()->as_FloatRegister(), src.first()->as_Register());
1101 } else {
1102 // gpr -> fpr. Use work space on stack to transfer data.
1103 Address stackaddr(Z_SP, workspace_offset);
1104
1105 __ reg2mem_opt(src.first()->as_Register(), stackaddr, false);
1106 __ mem2freg_opt(dst.first()->as_FloatRegister(), stackaddr, false);
1107 }
1108 }
1109 }
1110 } else {
1111 if (dst.first()->is_stack()) {
1112 // fpr -> stack
1113 __ freg2mem_opt(src.first()->as_FloatRegister(),
1114 Address(Z_SP, reg2offset(dst.first())), false);
1115 } else {
1116 if (dst.first()->is_Register()) {
1117 if (VM_Version::has_FPSupportEnhancements()) {
1118 // fpr -> gpr.
1119 __ z_lgdr(dst.first()->as_Register(), src.first()->as_FloatRegister());
1120 } else {
1121 // fpr -> gpr. Use work space on stack to transfer data.
1122 Address stackaddr(Z_SP, workspace_offset);
1123
1124 __ freg2mem_opt(src.first()->as_FloatRegister(), stackaddr, false);
1125 __ mem2reg_opt(dst.first()->as_Register(), stackaddr, false);
1126 }
1127 } else {
1128 // fpr -> fpr
1129 __ move_freg_if_needed(dst.first()->as_FloatRegister(), T_FLOAT,
1130 src.first()->as_FloatRegister(), T_FLOAT);
1131 }
1132 }
1133 }
1134 }
1135
1136 //----------------------------------------------------------------------
1137 // A double arg. May have to do double reg to long reg conversion
1138 //----------------------------------------------------------------------
1139 static void double_move(MacroAssembler *masm,
1140 VMRegPair src,
1141 VMRegPair dst,
1142 int framesize_in_slots,
1143 int workspace_slot_offset) {
1144 int frame_offset = framesize_in_slots*VMRegImpl::stack_slot_size;
1145 int workspace_offset = workspace_slot_offset*VMRegImpl::stack_slot_size;
1146
1147 // Since src is always a java calling convention we know that the
1148 // src pair is always either all registers or all stack (and aligned?)
1149
1150 if (src.first()->is_stack()) {
1151 if (dst.first()->is_stack()) {
1152 // stack -> stack. The easiest of the bunch.
1153 __ z_mvc(Address(Z_SP, reg2offset(dst.first())),
1154 Address(Z_SP, reg2offset(src.first()) + frame_offset), sizeof(double));
1155 } else {
1156 // stack to reg
1157 Address stackaddr(Z_SP, reg2offset(src.first()) + frame_offset);
1158
1159 if (dst.first()->is_Register()) {
1160 __ mem2reg_opt(dst.first()->as_Register(), stackaddr);
1161 } else {
1162 __ mem2freg_opt(dst.first()->as_FloatRegister(), stackaddr);
1163 }
1164 }
1165 } else if (src.first()->is_Register()) {
1166 if (dst.first()->is_stack()) {
1167 // gpr -> stack
1168 __ reg2mem_opt(src.first()->as_Register(),
1169 Address(Z_SP, reg2offset(dst.first())));
1170 } else {
1171 if (dst.first()->is_Register()) {
1172 // gpr -> gpr
1173 __ move_reg_if_needed(dst.first()->as_Register(), T_LONG,
1174 src.first()->as_Register(), T_LONG);
1175 } else {
1176 if (VM_Version::has_FPSupportEnhancements()) {
1177 // gpr -> fpr. Exploit z10 capability of direct transfer.
1178 __ z_ldgr(dst.first()->as_FloatRegister(), src.first()->as_Register());
1179 } else {
1180 // gpr -> fpr. Use work space on stack to transfer data.
1181 Address stackaddr(Z_SP, workspace_offset);
1182 __ reg2mem_opt(src.first()->as_Register(), stackaddr);
1183 __ mem2freg_opt(dst.first()->as_FloatRegister(), stackaddr);
1184 }
1185 }
1186 }
1187 } else {
1188 if (dst.first()->is_stack()) {
1189 // fpr -> stack
1190 __ freg2mem_opt(src.first()->as_FloatRegister(),
1191 Address(Z_SP, reg2offset(dst.first())));
1192 } else {
1193 if (dst.first()->is_Register()) {
1194 if (VM_Version::has_FPSupportEnhancements()) {
1195 // fpr -> gpr. Exploit z10 capability of direct transfer.
1196 __ z_lgdr(dst.first()->as_Register(), src.first()->as_FloatRegister());
1197 } else {
1198 // fpr -> gpr. Use work space on stack to transfer data.
1199 Address stackaddr(Z_SP, workspace_offset);
1200
1201 __ freg2mem_opt(src.first()->as_FloatRegister(), stackaddr);
1202 __ mem2reg_opt(dst.first()->as_Register(), stackaddr);
1203 }
1204 } else {
1205 // fpr -> fpr
1206 // In theory these overlap but the ordering is such that this is likely a nop.
1207 __ move_freg_if_needed(dst.first()->as_FloatRegister(), T_DOUBLE,
1208 src.first()->as_FloatRegister(), T_DOUBLE);
1209 }
1210 }
1211 }
1212 }
1213
1214 //----------------------------------------------------------------------
1215 // A long arg.
1216 //----------------------------------------------------------------------
1217 static void long_move(MacroAssembler *masm,
1218 VMRegPair src,
1219 VMRegPair dst,
1220 int framesize_in_slots) {
1221 int frame_offset = framesize_in_slots*VMRegImpl::stack_slot_size;
1222
1223 if (src.first()->is_stack()) {
1224 if (dst.first()->is_stack()) {
1225 // stack -> stack. The easiest of the bunch.
1226 __ z_mvc(Address(Z_SP, reg2offset(dst.first())),
1227 Address(Z_SP, reg2offset(src.first()) + frame_offset), sizeof(long));
1228 } else {
1229 // stack to reg
1230 assert(dst.first()->is_Register(), "long dst value must be in GPR");
1231 __ mem2reg_opt(dst.first()->as_Register(),
1232 Address(Z_SP, reg2offset(src.first()) + frame_offset));
1233 }
1234 } else {
1235 // reg to reg
1236 assert(src.first()->is_Register(), "long src value must be in GPR");
1237 if (dst.first()->is_stack()) {
1238 // reg -> stack
1239 __ reg2mem_opt(src.first()->as_Register(),
1240 Address(Z_SP, reg2offset(dst.first())));
1241 } else {
1242 // reg -> reg
1243 assert(dst.first()->is_Register(), "long dst value must be in GPR");
1244 __ move_reg_if_needed(dst.first()->as_Register(),
1245 T_LONG, src.first()->as_Register(), T_LONG);
1246 }
1247 }
1248 }
1249
1250
1251 //----------------------------------------------------------------------
1252 // A int-like arg.
1253 //----------------------------------------------------------------------
1254 // On z/Architecture we will store integer like items to the stack as 64 bit
1255 // items, according to the z/Architecture ABI, even though Java would only store
1256 // 32 bits for a parameter.
1257 // We do sign extension for all base types. That is ok since the only
1258 // unsigned base type is T_CHAR, and T_CHAR uses only 16 bits of an int.
1259 // Sign extension 32->64 bit will thus not affect the value.
1260 //----------------------------------------------------------------------
1261 static void move32_64(MacroAssembler *masm,
1262 VMRegPair src,
1263 VMRegPair dst,
1264 int framesize_in_slots) {
1265 int frame_offset = framesize_in_slots * VMRegImpl::stack_slot_size;
1266
1267 if (src.first()->is_stack()) {
1268 Address memaddr(Z_SP, reg2offset(src.first()) + frame_offset);
1269 if (dst.first()->is_stack()) {
1270 // stack -> stack. MVC not possible due to sign extension.
1271 Address firstaddr(Z_SP, reg2offset(dst.first()));
1272 __ mem2reg_signed_opt(Z_R0_scratch, memaddr);
1273 __ reg2mem_opt(Z_R0_scratch, firstaddr);
1274 } else {
1275 // stack -> reg, sign extended
1276 __ mem2reg_signed_opt(dst.first()->as_Register(), memaddr);
1277 }
1278 } else {
1279 if (dst.first()->is_stack()) {
1280 // reg -> stack, sign extended
1281 Address firstaddr(Z_SP, reg2offset(dst.first()));
1282 __ z_lgfr(src.first()->as_Register(), src.first()->as_Register());
1283 __ reg2mem_opt(src.first()->as_Register(), firstaddr);
1284 } else {
1285 // reg -> reg, sign extended
1286 __ z_lgfr(dst.first()->as_Register(), src.first()->as_Register());
1287 }
1288 }
1289 }
1290
1291 //----------------------------------------------------------------------
1292 // Wrap a JNI call.
1293 //----------------------------------------------------------------------
1294 #undef USE_RESIZE_FRAME
1295 nmethod *SharedRuntime::generate_native_wrapper(MacroAssembler *masm,
1296 const methodHandle& method,
1297 int compile_id,
1298 BasicType *in_sig_bt,
1299 VMRegPair *in_regs,
1300 BasicType ret_type) {
1301 int total_in_args = method->size_of_parameters();
1302 if (method->is_method_handle_intrinsic()) {
1303 vmIntrinsics::ID iid = method->intrinsic_id();
1304 intptr_t start = (intptr_t) __ pc();
1305 int vep_offset = ((intptr_t) __ pc()) - start;
1306
1307 gen_special_dispatch(masm, total_in_args,
1308 method->intrinsic_id(), in_sig_bt, in_regs);
1309
1310 int frame_complete = ((intptr_t)__ pc()) - start; // Not complete, period.
1311
1312 __ flush();
1313
1314 int stack_slots = SharedRuntime::out_preserve_stack_slots(); // No out slots at all, actually.
1315
1316 return nmethod::new_native_nmethod(method,
1317 compile_id,
1318 masm->code(),
1319 vep_offset,
1320 frame_complete,
1321 stack_slots / VMRegImpl::slots_per_word,
1322 in_ByteSize(-1),
1323 in_ByteSize(-1),
1324 (OopMapSet *) nullptr);
1325 }
1326
1327
1328 ///////////////////////////////////////////////////////////////////////
1329 //
1330 // Precalculations before generating any code
1331 //
1332 ///////////////////////////////////////////////////////////////////////
1333
1334 address native_func = method->native_function();
1335 assert(native_func != nullptr, "must have function");
1336
1337 //---------------------------------------------------------------------
1338 // We have received a description of where all the java args are located
1339 // on entry to the wrapper. We need to convert these args to where
1340 // the jni function will expect them. To figure out where they go
1341 // we convert the java signature to a C signature by inserting
1342 // the hidden arguments as arg[0] and possibly arg[1] (static method).
1343 //
1344 // The first hidden argument arg[0] is a pointer to the JNI environment.
1345 // It is generated for every call.
1346 // The second argument arg[1] to the JNI call, which is hidden for static
1347 // methods, is the boxed lock object. For static calls, the lock object
1348 // is the static method itself. The oop is constructed here. for instance
1349 // calls, the lock is performed on the object itself, the pointer of
1350 // which is passed as the first visible argument.
1351 //---------------------------------------------------------------------
1352
1353 // Additionally, on z/Architecture we must convert integers
1354 // to longs in the C signature. We do this in advance in order to have
1355 // no trouble with indexes into the bt-arrays.
1356 // So convert the signature and registers now, and adjust the total number
1357 // of in-arguments accordingly.
1358 bool method_is_static = method->is_static();
1359 int total_c_args = total_in_args + (method_is_static ? 2 : 1);
1360
1361 BasicType *out_sig_bt = NEW_RESOURCE_ARRAY(BasicType, total_c_args);
1362 VMRegPair *out_regs = NEW_RESOURCE_ARRAY(VMRegPair, total_c_args);
1363 BasicType* in_elem_bt = nullptr;
1364
1365 // Create the signature for the C call:
1366 // 1) add the JNIEnv*
1367 // 2) add the class if the method is static
1368 // 3) copy the rest of the incoming signature (shifted by the number of
1369 // hidden arguments)
1370
1371 int argc = 0;
1372 out_sig_bt[argc++] = T_ADDRESS;
1373 if (method->is_static()) {
1374 out_sig_bt[argc++] = T_OBJECT;
1375 }
1376
1377 for (int i = 0; i < total_in_args; i++) {
1378 out_sig_bt[argc++] = in_sig_bt[i];
1379 }
1380
1381 ///////////////////////////////////////////////////////////////////////
1382 // Now figure out where the args must be stored and how much stack space
1383 // they require (neglecting out_preserve_stack_slots but providing space
1384 // for storing the first five register arguments).
1385 // It's weird, see int_stk_helper.
1386 ///////////////////////////////////////////////////////////////////////
1387
1388 //---------------------------------------------------------------------
1389 // Compute framesize for the wrapper.
1390 //
1391 // - We need to handlize all oops passed in registers.
1392 // - We must create space for them here that is disjoint from the save area.
1393 // - We always just allocate 5 words for storing down these object.
1394 // This allows us to simply record the base and use the Ireg number to
1395 // decide which slot to use.
1396 // - Note that the reg number used to index the stack slot is the inbound
1397 // number, not the outbound number.
1398 // - We must shuffle args to match the native convention,
1399 // and to include var-args space.
1400 //---------------------------------------------------------------------
1401
1402 //---------------------------------------------------------------------
1403 // Calculate the total number of stack slots we will need:
1404 // - 1) abi requirements
1405 // - 2) outgoing args
1406 // - 3) space for inbound oop handle area
1407 // - 4) space for handlizing a klass if static method
1408 // - 5) space for a lock if synchronized method
1409 // - 6) workspace (save rtn value, int<->float reg moves, ...)
1410 // - 7) filler slots for alignment
1411 //---------------------------------------------------------------------
1412 // Here is how the space we have allocated will look like.
1413 // Since we use resize_frame, we do not create a new stack frame,
1414 // but just extend the one we got with our own data area.
1415 //
1416 // If an offset or pointer name points to a separator line, it is
1417 // assumed that addressing with offset 0 selects storage starting
1418 // at the first byte above the separator line.
1419 //
1420 //
1421 // ... ...
1422 // | caller's frame |
1423 // FP-> |---------------------|
1424 // | filler slots, if any|
1425 // 7| #slots == mult of 2 |
1426 // |---------------------|
1427 // | work space |
1428 // 6| 2 slots = 8 bytes |
1429 // |---------------------|
1430 // 5| lock box (if sync) |
1431 // |---------------------| <- lock_slot_offset
1432 // 4| klass (if static) |
1433 // |---------------------| <- klass_slot_offset
1434 // 3| oopHandle area |
1435 // | |
1436 // | |
1437 // |---------------------| <- oop_handle_offset
1438 // 2| outbound memory |
1439 // ... ...
1440 // | based arguments |
1441 // |---------------------|
1442 // | vararg |
1443 // ... ...
1444 // | area |
1445 // |---------------------| <- out_arg_slot_offset
1446 // 1| out_preserved_slots |
1447 // ... ...
1448 // | (z_abi spec) |
1449 // SP-> |---------------------| <- FP_slot_offset (back chain)
1450 // ... ...
1451 //
1452 //---------------------------------------------------------------------
1453
1454 // *_slot_offset indicates offset from SP in #stack slots
1455 // *_offset indicates offset from SP in #bytes
1456
1457 int stack_slots = c_calling_convention(out_sig_bt, out_regs, total_c_args) + // 1+2
1458 SharedRuntime::out_preserve_stack_slots(); // see c_calling_convention
1459
1460 // Now the space for the inbound oop handle area.
1461 int total_save_slots = Register::number_of_arg_registers * VMRegImpl::slots_per_word;
1462
1463 int oop_handle_slot_offset = stack_slots;
1464 stack_slots += total_save_slots; // 3)
1465
1466 int klass_slot_offset = 0;
1467 int klass_offset = -1;
1468 if (method_is_static) { // 4)
1469 klass_slot_offset = stack_slots;
1470 klass_offset = klass_slot_offset * VMRegImpl::stack_slot_size;
1471 stack_slots += VMRegImpl::slots_per_word;
1472 }
1473
1474 int lock_slot_offset = 0;
1475 int lock_offset = -1;
1476 if (method->is_synchronized()) { // 5)
1477 lock_slot_offset = stack_slots;
1478 lock_offset = lock_slot_offset * VMRegImpl::stack_slot_size;
1479 stack_slots += VMRegImpl::slots_per_word;
1480 }
1481
1482 int workspace_slot_offset= stack_slots; // 6)
1483 stack_slots += 2;
1484
1485 // Now compute actual number of stack words we need.
1486 // Round to align stack properly.
1487 stack_slots = align_up(stack_slots, // 7)
1488 frame::alignment_in_bytes / VMRegImpl::stack_slot_size);
1489 int frame_size_in_bytes = stack_slots * VMRegImpl::stack_slot_size;
1490
1491
1492 ///////////////////////////////////////////////////////////////////////
1493 // Now we can start generating code
1494 ///////////////////////////////////////////////////////////////////////
1495
1496 unsigned int wrapper_CodeStart = __ offset();
1497 unsigned int wrapper_UEPStart;
1498 unsigned int wrapper_VEPStart;
1499 unsigned int wrapper_FrameDone;
1500 unsigned int wrapper_CRegsSet;
1501 Label handle_pending_exception;
1502
1503 //---------------------------------------------------------------------
1504 // Unverified entry point (UEP)
1505 //---------------------------------------------------------------------
1506
1507 // check ic: object class <-> cached class
1508 if (!method_is_static) {
1509 wrapper_UEPStart = __ ic_check(CodeEntryAlignment /* end_alignment */);
1510 }
1511
1512 //---------------------------------------------------------------------
1513 // Verified entry point (VEP)
1514 //---------------------------------------------------------------------
1515 wrapper_VEPStart = __ offset();
1516
1517 if (VM_Version::supports_fast_class_init_checks() && method->needs_clinit_barrier()) {
1518 Label L_skip_barrier;
1519 Register klass = Z_R1_scratch;
1520 // Notify OOP recorder (don't need the relocation)
1521 AddressLiteral md = __ constant_metadata_address(method->method_holder());
1522 __ load_const_optimized(klass, md.value());
1523 __ clinit_barrier(klass, Z_thread, &L_skip_barrier /*L_fast_path*/);
1524
1525 __ load_const_optimized(klass, SharedRuntime::get_handle_wrong_method_stub());
1526 __ z_br(klass);
1527
1528 __ bind(L_skip_barrier);
1529 }
1530
1531 __ save_return_pc();
1532 __ generate_stack_overflow_check(frame_size_in_bytes); // Check before creating frame.
1533 #ifndef USE_RESIZE_FRAME
1534 __ push_frame(frame_size_in_bytes); // Create a new frame for the wrapper.
1535 #else
1536 __ resize_frame(-frame_size_in_bytes, Z_R0_scratch); // No new frame for the wrapper.
1537 // Just resize the existing one.
1538 #endif
1539
1540 BarrierSetAssembler* bs = BarrierSet::barrier_set()->barrier_set_assembler();
1541 bs->nmethod_entry_barrier(masm);
1542
1543 wrapper_FrameDone = __ offset();
1544
1545 // Native nmethod wrappers never take possession of the oop arguments.
1546 // So the caller will gc the arguments.
1547 // The only thing we need an oopMap for is if the call is static.
1548 //
1549 // An OopMap for lock (and class if static), and one for the VM call itself
1550 OopMapSet *oop_maps = new OopMapSet();
1551 OopMap *map = new OopMap(stack_slots * 2, 0 /* arg_slots*/);
1552
1553 //////////////////////////////////////////////////////////////////////
1554 //
1555 // The Grand Shuffle
1556 //
1557 //////////////////////////////////////////////////////////////////////
1558 //
1559 // We immediately shuffle the arguments so that for any vm call we have
1560 // to make from here on out (sync slow path, jvmti, etc.) we will have
1561 // captured the oops from our caller and have a valid oopMap for them.
1562 //
1563 //--------------------------------------------------------------------
1564 // Natives require 1 or 2 extra arguments over the normal ones: the JNIEnv*
1565 // (derived from JavaThread* which is in Z_thread) and, if static,
1566 // the class mirror instead of a receiver. This pretty much guarantees that
1567 // register layout will not match. We ignore these extra arguments during
1568 // the shuffle. The shuffle is described by the two calling convention
1569 // vectors we have in our possession. We simply walk the java vector to
1570 // get the source locations and the c vector to get the destinations.
1571 //
1572 // This is a trick. We double the stack slots so we can claim
1573 // the oops in the caller's frame. Since we are sure to have
1574 // more args than the caller doubling is enough to make
1575 // sure we can capture all the incoming oop args from the caller.
1576 //--------------------------------------------------------------------
1577
1578 // Record sp-based slot for receiver on stack for non-static methods.
1579 int receiver_offset = -1;
1580
1581 //--------------------------------------------------------------------
1582 // We move the arguments backwards because the floating point registers
1583 // destination will always be to a register with a greater or equal
1584 // register number or the stack.
1585 // jix is the index of the incoming Java arguments.
1586 // cix is the index of the outgoing C arguments.
1587 //--------------------------------------------------------------------
1588
1589 #ifdef ASSERT
1590 bool reg_destroyed[Register::number_of_registers];
1591 bool freg_destroyed[FloatRegister::number_of_registers];
1592 for (int r = 0; r < Register::number_of_registers; r++) {
1593 reg_destroyed[r] = false;
1594 }
1595 for (int f = 0; f < FloatRegister::number_of_registers; f++) {
1596 freg_destroyed[f] = false;
1597 }
1598 #endif // ASSERT
1599
1600 for (int jix = total_in_args - 1, cix = total_c_args - 1; jix >= 0; jix--, cix--) {
1601 #ifdef ASSERT
1602 if (in_regs[jix].first()->is_Register()) {
1603 assert(!reg_destroyed[in_regs[jix].first()->as_Register()->encoding()], "ack!");
1604 } else {
1605 if (in_regs[jix].first()->is_FloatRegister()) {
1606 assert(!freg_destroyed[in_regs[jix].first()->as_FloatRegister()->encoding()], "ack!");
1607 }
1608 }
1609 if (out_regs[cix].first()->is_Register()) {
1610 reg_destroyed[out_regs[cix].first()->as_Register()->encoding()] = true;
1611 } else {
1612 if (out_regs[cix].first()->is_FloatRegister()) {
1613 freg_destroyed[out_regs[cix].first()->as_FloatRegister()->encoding()] = true;
1614 }
1615 }
1616 #endif // ASSERT
1617
1618 switch (in_sig_bt[jix]) {
1619 // Due to casting, small integers should only occur in pairs with type T_LONG.
1620 case T_BOOLEAN:
1621 case T_CHAR:
1622 case T_BYTE:
1623 case T_SHORT:
1624 case T_INT:
1625 // Move int and do sign extension.
1626 move32_64(masm, in_regs[jix], out_regs[cix], stack_slots);
1627 break;
1628
1629 case T_LONG :
1630 long_move(masm, in_regs[jix], out_regs[cix], stack_slots);
1631 break;
1632
1633 case T_ARRAY:
1634 case T_OBJECT:
1635 object_move(masm, map, oop_handle_slot_offset, stack_slots, in_regs[jix], out_regs[cix],
1636 ((jix == 0) && (!method_is_static)),
1637 &receiver_offset);
1638 break;
1639 case T_VOID:
1640 break;
1641
1642 case T_FLOAT:
1643 float_move(masm, in_regs[jix], out_regs[cix], stack_slots, workspace_slot_offset);
1644 break;
1645
1646 case T_DOUBLE:
1647 assert(jix+1 < total_in_args && in_sig_bt[jix+1] == T_VOID && out_sig_bt[cix+1] == T_VOID, "bad arg list");
1648 double_move(masm, in_regs[jix], out_regs[cix], stack_slots, workspace_slot_offset);
1649 break;
1650
1651 case T_ADDRESS:
1652 assert(false, "found T_ADDRESS in java args");
1653 break;
1654
1655 default:
1656 ShouldNotReachHere();
1657 }
1658 }
1659
1660 //--------------------------------------------------------------------
1661 // Pre-load a static method's oop into ARG2.
1662 // Used both by locking code and the normal JNI call code.
1663 //--------------------------------------------------------------------
1664 if (method_is_static) {
1665 __ set_oop_constant(JNIHandles::make_local(method->method_holder()->java_mirror()), Z_ARG2);
1666
1667 // Now handlize the static class mirror in ARG2. It's known not-null.
1668 __ z_stg(Z_ARG2, klass_offset, Z_SP);
1669 map->set_oop(VMRegImpl::stack2reg(klass_slot_offset));
1670 __ add2reg(Z_ARG2, klass_offset, Z_SP);
1671 }
1672
1673 // Get JNIEnv* which is first argument to native.
1674 __ add2reg(Z_ARG1, in_bytes(JavaThread::jni_environment_offset()), Z_thread);
1675
1676 //////////////////////////////////////////////////////////////////////
1677 // We have all of the arguments setup at this point.
1678 // We MUST NOT touch any outgoing regs from this point on.
1679 // So if we must call out we must push a new frame.
1680 //////////////////////////////////////////////////////////////////////
1681
1682
1683 // Calc the current pc into Z_R10 and into wrapper_CRegsSet.
1684 // Both values represent the same position.
1685 __ get_PC(Z_R10); // PC into register
1686 wrapper_CRegsSet = __ offset(); // and into into variable.
1687
1688 // Z_R10 now has the pc loaded that we will use when we finally call to native.
1689
1690 // We use the same pc/oopMap repeatedly when we call out.
1691 oop_maps->add_gc_map((int)(wrapper_CRegsSet-wrapper_CodeStart), map);
1692
1693 // Lock a synchronized method.
1694
1695 if (method->is_synchronized()) {
1696
1697 // ATTENTION: args and Z_R10 must be preserved.
1698 Register r_oop = Z_R11;
1699 Register r_box = Z_R12;
1700 Register r_tmp1 = Z_R13;
1701 Register r_tmp2 = Z_R7;
1702 Label done;
1703
1704 // Load the oop for the object or class. R_carg2_classorobject contains
1705 // either the handlized oop from the incoming arguments or the handlized
1706 // class mirror (if the method is static).
1707 __ z_lg(r_oop, 0, Z_ARG2);
1708
1709 lock_offset = (lock_slot_offset * VMRegImpl::stack_slot_size);
1710 // Get the lock box slot's address.
1711 __ add2reg(r_box, lock_offset, Z_SP);
1712
1713 // Try fastpath for locking.
1714 if (LockingMode == LM_LIGHTWEIGHT) {
1715 // Fast_lock kills r_temp_1, r_temp_2.
1716 __ compiler_fast_lock_lightweight_object(r_oop, r_tmp1, r_tmp2);
1717 } else {
1718 // Fast_lock kills r_temp_1, r_temp_2.
1719 __ compiler_fast_lock_object(r_oop, r_box, r_tmp1, r_tmp2);
1720 }
1721 __ z_bre(done);
1722
1723 //-------------------------------------------------------------------------
1724 // None of the above fast optimizations worked so we have to get into the
1725 // slow case of monitor enter. Inline a special case of call_VM that
1726 // disallows any pending_exception.
1727 //-------------------------------------------------------------------------
1728
1729 Register oldSP = Z_R11;
1730
1731 __ z_lgr(oldSP, Z_SP);
1732
1733 RegisterSaver::save_live_registers(masm, RegisterSaver::arg_registers);
1734
1735 // Prepare arguments for call.
1736 __ z_lg(Z_ARG1, 0, Z_ARG2); // Ynboxed class mirror or unboxed object.
1737 __ add2reg(Z_ARG2, lock_offset, oldSP);
1738 __ z_lgr(Z_ARG3, Z_thread);
1739
1740 __ set_last_Java_frame(oldSP, Z_R10 /* gc map pc */);
1741
1742 // Do the call.
1743 __ load_const_optimized(Z_R1_scratch, CAST_FROM_FN_PTR(address, SharedRuntime::complete_monitor_locking_C));
1744 __ call(Z_R1_scratch);
1745
1746 __ reset_last_Java_frame();
1747
1748 RegisterSaver::restore_live_registers(masm, RegisterSaver::arg_registers);
1749 #ifdef ASSERT
1750 { Label L;
1751 __ load_and_test_long(Z_R0, Address(Z_thread, Thread::pending_exception_offset()));
1752 __ z_bre(L);
1753 __ stop("no pending exception allowed on exit from IR::monitorenter");
1754 __ bind(L);
1755 }
1756 #endif
1757 __ bind(done);
1758 } // lock for synchronized methods
1759
1760
1761 //////////////////////////////////////////////////////////////////////
1762 // Finally just about ready to make the JNI call.
1763 //////////////////////////////////////////////////////////////////////
1764
1765 // Use that pc we placed in Z_R10 a while back as the current frame anchor.
1766 __ set_last_Java_frame(Z_SP, Z_R10);
1767
1768 // Transition from _thread_in_Java to _thread_in_native.
1769 __ set_thread_state(_thread_in_native);
1770
1771 //////////////////////////////////////////////////////////////////////
1772 // This is the JNI call.
1773 //////////////////////////////////////////////////////////////////////
1774
1775 __ call_c(native_func);
1776
1777
1778 //////////////////////////////////////////////////////////////////////
1779 // We have survived the call once we reach here.
1780 //////////////////////////////////////////////////////////////////////
1781
1782
1783 //--------------------------------------------------------------------
1784 // Unpack native results.
1785 //--------------------------------------------------------------------
1786 // For int-types, we do any needed sign-extension required.
1787 // Care must be taken that the return value (in Z_ARG1 = Z_RET = Z_R2
1788 // or in Z_FARG0 = Z_FRET = Z_F0) will survive any VM calls for
1789 // blocking or unlocking.
1790 // An OOP result (handle) is done specially in the slow-path code.
1791 //--------------------------------------------------------------------
1792 switch (ret_type) {
1793 case T_VOID: break; // Nothing to do!
1794 case T_FLOAT: break; // Got it where we want it (unless slow-path)
1795 case T_DOUBLE: break; // Got it where we want it (unless slow-path)
1796 case T_LONG: break; // Got it where we want it (unless slow-path)
1797 case T_OBJECT: break; // Really a handle.
1798 // Cannot de-handlize until after reclaiming jvm_lock.
1799 case T_ARRAY: break;
1800
1801 case T_BOOLEAN: // 0 -> false(0); !0 -> true(1)
1802 __ z_lngfr(Z_RET, Z_RET); // Force sign bit on except for zero.
1803 __ z_srlg(Z_RET, Z_RET, 63); // Shift sign bit into least significant pos.
1804 break;
1805 case T_BYTE: __ z_lgbr(Z_RET, Z_RET); break; // sign extension
1806 case T_CHAR: __ z_llghr(Z_RET, Z_RET); break; // unsigned result
1807 case T_SHORT: __ z_lghr(Z_RET, Z_RET); break; // sign extension
1808 case T_INT: __ z_lgfr(Z_RET, Z_RET); break; // sign-extend for beauty.
1809
1810 default:
1811 ShouldNotReachHere();
1812 break;
1813 }
1814
1815 Label after_transition;
1816
1817 // Switch thread to "native transition" state before reading the synchronization state.
1818 // This additional state is necessary because reading and testing the synchronization
1819 // state is not atomic w.r.t. GC, as this scenario demonstrates:
1820 // - Java thread A, in _thread_in_native state, loads _not_synchronized and is preempted.
1821 // - VM thread changes sync state to synchronizing and suspends threads for GC.
1822 // - Thread A is resumed to finish this native method, but doesn't block here since it
1823 // didn't see any synchronization in progress, and escapes.
1824
1825 // Transition from _thread_in_native to _thread_in_native_trans.
1826 __ set_thread_state(_thread_in_native_trans);
1827
1828 // Safepoint synchronization
1829 //--------------------------------------------------------------------
1830 // Must we block?
1831 //--------------------------------------------------------------------
1832 // Block, if necessary, before resuming in _thread_in_Java state.
1833 // In order for GC to work, don't clear the last_Java_sp until after blocking.
1834 //--------------------------------------------------------------------
1835 {
1836 Label no_block, sync;
1837
1838 save_native_result(masm, ret_type, workspace_slot_offset); // Make Z_R2 available as work reg.
1839
1840 // Force this write out before the read below.
1841 if (!UseSystemMemoryBarrier) {
1842 __ z_fence();
1843 }
1844
1845 __ safepoint_poll(sync, Z_R1);
1846
1847 __ load_and_test_int(Z_R0, Address(Z_thread, JavaThread::suspend_flags_offset()));
1848 __ z_bre(no_block);
1849
1850 // Block. Save any potential method result value before the operation and
1851 // use a leaf call to leave the last_Java_frame setup undisturbed. Doing this
1852 // lets us share the oopMap we used when we went native rather than create
1853 // a distinct one for this pc.
1854 //
1855 __ bind(sync);
1856 __ z_acquire();
1857
1858 address entry_point = CAST_FROM_FN_PTR(address, JavaThread::check_special_condition_for_native_trans);
1859
1860 __ call_VM_leaf(entry_point, Z_thread);
1861
1862 __ bind(no_block);
1863 restore_native_result(masm, ret_type, workspace_slot_offset);
1864 }
1865
1866 //--------------------------------------------------------------------
1867 // Thread state is thread_in_native_trans. Any safepoint blocking has
1868 // already happened so we can now change state to _thread_in_Java.
1869 //--------------------------------------------------------------------
1870 // Transition from _thread_in_native_trans to _thread_in_Java.
1871 __ set_thread_state(_thread_in_Java);
1872 __ bind(after_transition);
1873
1874 //--------------------------------------------------------------------
1875 // Reguard any pages if necessary.
1876 // Protect native result from being destroyed.
1877 //--------------------------------------------------------------------
1878
1879 Label no_reguard;
1880
1881 __ z_cli(Address(Z_thread, JavaThread::stack_guard_state_offset() + in_ByteSize(sizeof(StackOverflow::StackGuardState) - 1)),
1882 StackOverflow::stack_guard_yellow_reserved_disabled);
1883
1884 __ z_bre(no_reguard);
1885
1886 save_native_result(masm, ret_type, workspace_slot_offset);
1887 __ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::reguard_yellow_pages), Z_method);
1888 restore_native_result(masm, ret_type, workspace_slot_offset);
1889
1890 __ bind(no_reguard);
1891
1892
1893 // Synchronized methods (slow path only)
1894 // No pending exceptions for now.
1895 //--------------------------------------------------------------------
1896 // Handle possibly pending exception (will unlock if necessary).
1897 // Native result is, if any is live, in Z_FRES or Z_RES.
1898 //--------------------------------------------------------------------
1899 // Unlock
1900 //--------------------------------------------------------------------
1901 if (method->is_synchronized()) {
1902 const Register r_oop = Z_R11;
1903 const Register r_box = Z_R12;
1904 const Register r_tmp1 = Z_R13;
1905 const Register r_tmp2 = Z_R7;
1906 Label done;
1907
1908 // Get unboxed oop of class mirror or object ...
1909 int offset = method_is_static ? klass_offset : receiver_offset;
1910
1911 assert(offset != -1, "");
1912 __ z_lg(r_oop, offset, Z_SP);
1913
1914 // ... and address of lock object box.
1915 __ add2reg(r_box, lock_offset, Z_SP);
1916
1917 // Try fastpath for unlocking.
1918 if (LockingMode == LM_LIGHTWEIGHT) {
1919 // Fast_unlock kills r_tmp1, r_tmp2.
1920 __ compiler_fast_unlock_lightweight_object(r_oop, r_tmp1, r_tmp2);
1921 } else {
1922 // Fast_unlock kills r_tmp1, r_tmp2.
1923 __ compiler_fast_unlock_object(r_oop, r_box, r_tmp1, r_tmp2);
1924 }
1925 __ z_bre(done);
1926
1927 // Slow path for unlocking.
1928 // Save and restore any potential method result value around the unlocking operation.
1929 const Register R_exc = Z_R11;
1930
1931 save_native_result(masm, ret_type, workspace_slot_offset);
1932
1933 // Must save pending exception around the slow-path VM call. Since it's a
1934 // leaf call, the pending exception (if any) can be kept in a register.
1935 __ z_lg(R_exc, Address(Z_thread, Thread::pending_exception_offset()));
1936 assert(R_exc->is_nonvolatile(), "exception register must be non-volatile");
1937
1938 // Must clear pending-exception before re-entering the VM. Since this is
1939 // a leaf call, pending-exception-oop can be safely kept in a register.
1940 __ clear_mem(Address(Z_thread, Thread::pending_exception_offset()), sizeof(intptr_t));
1941
1942 // Inline a special case of call_VM that disallows any pending_exception.
1943
1944 // Get locked oop from the handle we passed to jni.
1945 __ z_lg(Z_ARG1, offset, Z_SP);
1946 __ add2reg(Z_ARG2, lock_offset, Z_SP);
1947 __ z_lgr(Z_ARG3, Z_thread);
1948
1949 __ load_const_optimized(Z_R1_scratch, CAST_FROM_FN_PTR(address, SharedRuntime::complete_monitor_unlocking_C));
1950
1951 __ call(Z_R1_scratch);
1952
1953 #ifdef ASSERT
1954 {
1955 Label L;
1956 __ load_and_test_long(Z_R0, Address(Z_thread, Thread::pending_exception_offset()));
1957 __ z_bre(L);
1958 __ stop("no pending exception allowed on exit from IR::monitorexit");
1959 __ bind(L);
1960 }
1961 #endif
1962
1963 // Check_forward_pending_exception jump to forward_exception if any pending
1964 // exception is set. The forward_exception routine expects to see the
1965 // exception in pending_exception and not in a register. Kind of clumsy,
1966 // since all folks who branch to forward_exception must have tested
1967 // pending_exception first and hence have it in a register already.
1968 __ z_stg(R_exc, Address(Z_thread, Thread::pending_exception_offset()));
1969 restore_native_result(masm, ret_type, workspace_slot_offset);
1970 __ z_bru(done);
1971 __ z_illtrap(0x66);
1972
1973 __ bind(done);
1974 }
1975
1976
1977 //--------------------------------------------------------------------
1978 // Clear "last Java frame" SP and PC.
1979 //--------------------------------------------------------------------
1980
1981 __ reset_last_Java_frame();
1982
1983 // Unpack oop result, e.g. JNIHandles::resolve result.
1984 if (is_reference_type(ret_type)) {
1985 __ resolve_jobject(Z_RET, /* tmp1 */ Z_R13, /* tmp2 */ Z_R7);
1986 }
1987
1988 if (CheckJNICalls) {
1989 // clear_pending_jni_exception_check
1990 __ clear_mem(Address(Z_thread, JavaThread::pending_jni_exception_check_fn_offset()), sizeof(oop));
1991 }
1992
1993 // Reset handle block.
1994 __ z_lg(Z_R1_scratch, Address(Z_thread, JavaThread::active_handles_offset()));
1995 __ clear_mem(Address(Z_R1_scratch, JNIHandleBlock::top_offset()), 4);
1996
1997 // Check for pending exceptions.
1998 __ load_and_test_long(Z_R0, Address(Z_thread, Thread::pending_exception_offset()));
1999 __ z_brne(handle_pending_exception);
2000
2001
2002 //////////////////////////////////////////////////////////////////////
2003 // Return
2004 //////////////////////////////////////////////////////////////////////
2005
2006
2007 #ifndef USE_RESIZE_FRAME
2008 __ pop_frame(); // Pop wrapper frame.
2009 #else
2010 __ resize_frame(frame_size_in_bytes, Z_R0_scratch); // Revert stack extension.
2011 #endif
2012 __ restore_return_pc(); // This is the way back to the caller.
2013 __ z_br(Z_R14);
2014
2015
2016 //////////////////////////////////////////////////////////////////////
2017 // Out-of-line calls to the runtime.
2018 //////////////////////////////////////////////////////////////////////
2019
2020
2021 //---------------------------------------------------------------------
2022 // Handler for pending exceptions (out-of-line).
2023 //---------------------------------------------------------------------
2024 // Since this is a native call, we know the proper exception handler
2025 // is the empty function. We just pop this frame and then jump to
2026 // forward_exception_entry. Z_R14 will contain the native caller's
2027 // return PC.
2028 __ bind(handle_pending_exception);
2029 __ pop_frame();
2030 __ load_const_optimized(Z_R1_scratch, StubRoutines::forward_exception_entry());
2031 __ restore_return_pc();
2032 __ z_br(Z_R1_scratch);
2033
2034 __ flush();
2035 //////////////////////////////////////////////////////////////////////
2036 // end of code generation
2037 //////////////////////////////////////////////////////////////////////
2038
2039
2040 nmethod *nm = nmethod::new_native_nmethod(method,
2041 compile_id,
2042 masm->code(),
2043 (int)(wrapper_VEPStart-wrapper_CodeStart),
2044 (int)(wrapper_FrameDone-wrapper_CodeStart),
2045 stack_slots / VMRegImpl::slots_per_word,
2046 (method_is_static ? in_ByteSize(klass_offset) : in_ByteSize(receiver_offset)),
2047 in_ByteSize(lock_offset),
2048 oop_maps);
2049
2050 return nm;
2051 }
2052
2053 static address gen_c2i_adapter(MacroAssembler *masm,
2054 int total_args_passed,
2055 int comp_args_on_stack,
2056 const BasicType *sig_bt,
2057 const VMRegPair *regs,
2058 Label &skip_fixup) {
2059 // Before we get into the guts of the C2I adapter, see if we should be here
2060 // at all. We've come from compiled code and are attempting to jump to the
2061 // interpreter, which means the caller made a static call to get here
2062 // (vcalls always get a compiled target if there is one). Check for a
2063 // compiled target. If there is one, we need to patch the caller's call.
2064
2065 // These two defs MUST MATCH code in gen_i2c2i_adapter!
2066 const Register ientry = Z_R11;
2067 const Register code = Z_R11;
2068
2069 address c2i_entrypoint;
2070 Label patch_callsite;
2071
2072 // Regular (verified) c2i entry point.
2073 c2i_entrypoint = __ pc();
2074
2075 // Call patching needed?
2076 __ load_and_test_long(Z_R0_scratch, method_(code));
2077 __ z_lg(ientry, method_(interpreter_entry)); // Preload interpreter entry (also if patching).
2078 __ z_brne(patch_callsite); // Patch required if code isn't null (compiled target exists).
2079
2080 __ bind(skip_fixup); // Return point from patch_callsite.
2081
2082 // Since all args are passed on the stack, total_args_passed*wordSize is the
2083 // space we need. We need ABI scratch area but we use the caller's since
2084 // it has already been allocated.
2085
2086 const int abi_scratch = frame::z_top_ijava_frame_abi_size;
2087 int extraspace = align_up(total_args_passed, 2)*wordSize + abi_scratch;
2088 Register sender_SP = Z_R10;
2089 Register value = Z_R12;
2090
2091 // Remember the senderSP so we can pop the interpreter arguments off of the stack.
2092 // In addition, frame manager expects initial_caller_sp in Z_R10.
2093 __ z_lgr(sender_SP, Z_SP);
2094
2095 // This should always fit in 14 bit immediate.
2096 __ resize_frame(-extraspace, Z_R0_scratch);
2097
2098 // We use the caller's ABI scratch area (out_preserved_stack_slots) for the initial
2099 // args. This essentially moves the callers ABI scratch area from the top to the
2100 // bottom of the arg area.
2101
2102 int st_off = extraspace - wordSize;
2103
2104 // Now write the args into the outgoing interpreter space.
2105 for (int i = 0; i < total_args_passed; i++) {
2106 VMReg r_1 = regs[i].first();
2107 VMReg r_2 = regs[i].second();
2108 if (!r_1->is_valid()) {
2109 assert(!r_2->is_valid(), "");
2110 continue;
2111 }
2112 if (r_1->is_stack()) {
2113 // The calling convention produces OptoRegs that ignore the preserve area (abi scratch).
2114 // We must account for it here.
2115 int ld_off = (r_1->reg2stack() + SharedRuntime::out_preserve_stack_slots()) * VMRegImpl::stack_slot_size;
2116
2117 if (!r_2->is_valid()) {
2118 __ z_mvc(Address(Z_SP, st_off), Address(sender_SP, ld_off), sizeof(void*));
2119 } else {
2120 // longs are given 2 64-bit slots in the interpreter,
2121 // but the data is passed in only 1 slot.
2122 if (sig_bt[i] == T_LONG || sig_bt[i] == T_DOUBLE) {
2123 #ifdef ASSERT
2124 __ clear_mem(Address(Z_SP, st_off), sizeof(void *));
2125 #endif
2126 st_off -= wordSize;
2127 }
2128 __ z_mvc(Address(Z_SP, st_off), Address(sender_SP, ld_off), sizeof(void*));
2129 }
2130 } else {
2131 if (r_1->is_Register()) {
2132 if (!r_2->is_valid()) {
2133 __ z_st(r_1->as_Register(), st_off, Z_SP);
2134 } else {
2135 // longs are given 2 64-bit slots in the interpreter, but the
2136 // data is passed in only 1 slot.
2137 if (sig_bt[i] == T_LONG || sig_bt[i] == T_DOUBLE) {
2138 #ifdef ASSERT
2139 __ clear_mem(Address(Z_SP, st_off), sizeof(void *));
2140 #endif
2141 st_off -= wordSize;
2142 }
2143 __ z_stg(r_1->as_Register(), st_off, Z_SP);
2144 }
2145 } else {
2146 assert(r_1->is_FloatRegister(), "");
2147 if (!r_2->is_valid()) {
2148 __ z_ste(r_1->as_FloatRegister(), st_off, Z_SP);
2149 } else {
2150 // In 64bit, doubles are given 2 64-bit slots in the interpreter, but the
2151 // data is passed in only 1 slot.
2152 // One of these should get known junk...
2153 #ifdef ASSERT
2154 __ z_lzdr(Z_F1);
2155 __ z_std(Z_F1, st_off, Z_SP);
2156 #endif
2157 st_off-=wordSize;
2158 __ z_std(r_1->as_FloatRegister(), st_off, Z_SP);
2159 }
2160 }
2161 }
2162 st_off -= wordSize;
2163 }
2164
2165
2166 // Jump to the interpreter just as if interpreter was doing it.
2167 __ add2reg(Z_esp, st_off, Z_SP);
2168
2169 // Frame_manager expects initial_caller_sp (= SP without resize by c2i) in Z_R10.
2170 __ z_br(ientry);
2171
2172
2173 // Prevent illegal entry to out-of-line code.
2174 __ z_illtrap(0x22);
2175
2176 // Generate out-of-line runtime call to patch caller,
2177 // then continue as interpreted.
2178
2179 // IF you lose the race you go interpreted.
2180 // We don't see any possible endless c2i -> i2c -> c2i ...
2181 // transitions no matter how rare.
2182 __ bind(patch_callsite);
2183
2184 RegisterSaver::save_live_registers(masm, RegisterSaver::arg_registers);
2185 __ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::fixup_callers_callsite), Z_method, Z_R14);
2186 RegisterSaver::restore_live_registers(masm, RegisterSaver::arg_registers);
2187 __ z_bru(skip_fixup);
2188
2189 // end of out-of-line code
2190
2191 return c2i_entrypoint;
2192 }
2193
2194 // On entry, the following registers are set
2195 //
2196 // Z_thread r8 - JavaThread*
2197 // Z_method r9 - callee's method (method to be invoked)
2198 // Z_esp r7 - operand (or expression) stack pointer of caller. one slot above last arg.
2199 // Z_SP r15 - SP prepared by call stub such that caller's outgoing args are near top
2200 //
2201 void SharedRuntime::gen_i2c_adapter(MacroAssembler *masm,
2202 int total_args_passed,
2203 int comp_args_on_stack,
2204 const BasicType *sig_bt,
2205 const VMRegPair *regs) {
2206 const Register value = Z_R12;
2207 const Register ld_ptr= Z_esp;
2208
2209 int ld_offset = total_args_passed * wordSize;
2210
2211 // Cut-out for having no stack args.
2212 if (comp_args_on_stack) {
2213 // Sig words on the stack are greater than VMRegImpl::stack0. Those in
2214 // registers are below. By subtracting stack0, we either get a negative
2215 // number (all values in registers) or the maximum stack slot accessed.
2216 // Convert VMRegImpl (4 byte) stack slots to words.
2217 int comp_words_on_stack = align_up(comp_args_on_stack*VMRegImpl::stack_slot_size, wordSize)>>LogBytesPerWord;
2218 // Round up to miminum stack alignment, in wordSize
2219 comp_words_on_stack = align_up(comp_words_on_stack, 2);
2220
2221 __ resize_frame(-comp_words_on_stack*wordSize, Z_R0_scratch);
2222 }
2223
2224 // Now generate the shuffle code. Pick up all register args and move the
2225 // rest through register value=Z_R12.
2226 for (int i = 0; i < total_args_passed; i++) {
2227 if (sig_bt[i] == T_VOID) {
2228 assert(i > 0 && (sig_bt[i-1] == T_LONG || sig_bt[i-1] == T_DOUBLE), "missing half");
2229 continue;
2230 }
2231
2232 // Pick up 0, 1 or 2 words from ld_ptr.
2233 assert(!regs[i].second()->is_valid() || regs[i].first()->next() == regs[i].second(),
2234 "scrambled load targets?");
2235 VMReg r_1 = regs[i].first();
2236 VMReg r_2 = regs[i].second();
2237 if (!r_1->is_valid()) {
2238 assert(!r_2->is_valid(), "");
2239 continue;
2240 }
2241 if (r_1->is_FloatRegister()) {
2242 if (!r_2->is_valid()) {
2243 __ z_le(r_1->as_FloatRegister(), ld_offset, ld_ptr);
2244 ld_offset-=wordSize;
2245 } else {
2246 // Skip the unused interpreter slot.
2247 __ z_ld(r_1->as_FloatRegister(), ld_offset - wordSize, ld_ptr);
2248 ld_offset -= 2 * wordSize;
2249 }
2250 } else {
2251 if (r_1->is_stack()) {
2252 // Must do a memory to memory move.
2253 int st_off = (r_1->reg2stack() + SharedRuntime::out_preserve_stack_slots()) * VMRegImpl::stack_slot_size;
2254
2255 if (!r_2->is_valid()) {
2256 __ z_mvc(Address(Z_SP, st_off), Address(ld_ptr, ld_offset), sizeof(void*));
2257 } else {
2258 // In 64bit, longs are given 2 64-bit slots in the interpreter, but the
2259 // data is passed in only 1 slot.
2260 if (sig_bt[i] == T_LONG || sig_bt[i] == T_DOUBLE) {
2261 ld_offset -= wordSize;
2262 }
2263 __ z_mvc(Address(Z_SP, st_off), Address(ld_ptr, ld_offset), sizeof(void*));
2264 }
2265 } else {
2266 if (!r_2->is_valid()) {
2267 // Not sure we need to do this but it shouldn't hurt.
2268 if (is_reference_type(sig_bt[i]) || sig_bt[i] == T_ADDRESS) {
2269 __ z_lg(r_1->as_Register(), ld_offset, ld_ptr);
2270 } else {
2271 __ z_l(r_1->as_Register(), ld_offset, ld_ptr);
2272 }
2273 } else {
2274 // In 64bit, longs are given 2 64-bit slots in the interpreter, but the
2275 // data is passed in only 1 slot.
2276 if (sig_bt[i] == T_LONG || sig_bt[i] == T_DOUBLE) {
2277 ld_offset -= wordSize;
2278 }
2279 __ z_lg(r_1->as_Register(), ld_offset, ld_ptr);
2280 }
2281 }
2282 ld_offset -= wordSize;
2283 }
2284 }
2285
2286 // Jump to the compiled code just as if compiled code was doing it.
2287 // load target address from method:
2288 __ z_lg(Z_R1_scratch, Address(Z_method, Method::from_compiled_offset()));
2289
2290 // Store method into thread->callee_target.
2291 // 6243940: We might end up in handle_wrong_method if
2292 // the callee is deoptimized as we race thru here. If that
2293 // happens we don't want to take a safepoint because the
2294 // caller frame will look interpreted and arguments are now
2295 // "compiled" so it is much better to make this transition
2296 // invisible to the stack walking code. Unfortunately, if
2297 // we try and find the callee by normal means a safepoint
2298 // is possible. So we stash the desired callee in the thread
2299 // and the vm will find it there should this case occur.
2300 __ z_stg(Z_method, thread_(callee_target));
2301
2302 __ z_br(Z_R1_scratch);
2303 }
2304
2305 AdapterHandlerEntry* SharedRuntime::generate_i2c2i_adapters(MacroAssembler *masm,
2306 int total_args_passed,
2307 int comp_args_on_stack,
2308 const BasicType *sig_bt,
2309 const VMRegPair *regs,
2310 AdapterFingerPrint* fingerprint) {
2311 __ align(CodeEntryAlignment);
2312 address i2c_entry = __ pc();
2313 gen_i2c_adapter(masm, total_args_passed, comp_args_on_stack, sig_bt, regs);
2314
2315 address c2i_unverified_entry;
2316
2317 Label skip_fixup;
2318 {
2319 Label ic_miss;
2320
2321 // Out-of-line call to ic_miss handler.
2322 __ call_ic_miss_handler(ic_miss, 0x11, 0, Z_R1_scratch);
2323
2324 // Unverified Entry Point UEP
2325 __ align(CodeEntryAlignment);
2326 c2i_unverified_entry = __ pc();
2327
2328 __ ic_check(2);
2329 __ z_lg(Z_method, Address(Z_inline_cache, CompiledICData::speculated_method_offset()));
2330 // This def MUST MATCH code in gen_c2i_adapter!
2331 const Register code = Z_R11;
2332
2333 __ load_and_test_long(Z_R0, method_(code));
2334 __ z_brne(ic_miss); // Cache miss: call runtime to handle this.
2335
2336 // Fallthru to VEP. Duplicate LTG, but saved taken branch.
2337 }
2338
2339 address c2i_entry = __ pc();
2340
2341 // Class initialization barrier for static methods
2342 address c2i_no_clinit_check_entry = nullptr;
2343 if (VM_Version::supports_fast_class_init_checks()) {
2344 Label L_skip_barrier;
2345
2346 { // Bypass the barrier for non-static methods
2347 __ testbit(Address(Z_method, Method::access_flags_offset()), JVM_ACC_STATIC_BIT);
2348 __ z_bfalse(L_skip_barrier); // non-static
2349 }
2350
2351 Register klass = Z_R11;
2352 __ load_method_holder(klass, Z_method);
2353 __ clinit_barrier(klass, Z_thread, &L_skip_barrier /*L_fast_path*/);
2354
2355 __ load_const_optimized(klass, SharedRuntime::get_handle_wrong_method_stub());
2356 __ z_br(klass);
2357
2358 __ bind(L_skip_barrier);
2359 c2i_no_clinit_check_entry = __ pc();
2360 }
2361
2362 gen_c2i_adapter(masm, total_args_passed, comp_args_on_stack, sig_bt, regs, skip_fixup);
2363
2364 return AdapterHandlerLibrary::new_entry(fingerprint, i2c_entry, c2i_entry, c2i_unverified_entry, c2i_no_clinit_check_entry);
2365 }
2366
2367 // This function returns the adjust size (in number of words) to a c2i adapter
2368 // activation for use during deoptimization.
2369 //
2370 // Actually only compiled frames need to be adjusted, but it
2371 // doesn't harm to adjust entry and interpreter frames, too.
2372 //
2373 int Deoptimization::last_frame_adjust(int callee_parameters, int callee_locals) {
2374 assert(callee_locals >= callee_parameters,
2375 "test and remove; got more parms than locals");
2376 // Handle the abi adjustment here instead of doing it in push_skeleton_frames.
2377 return (callee_locals - callee_parameters) * Interpreter::stackElementWords +
2378 frame::z_parent_ijava_frame_abi_size / BytesPerWord;
2379 }
2380
2381 uint SharedRuntime::in_preserve_stack_slots() {
2382 return frame::jit_in_preserve_size_in_4_byte_units;
2383 }
2384
2385 uint SharedRuntime::out_preserve_stack_slots() {
2386 return frame::z_jit_out_preserve_size/VMRegImpl::stack_slot_size;
2387 }
2388
2389 //
2390 // Frame generation for deopt and uncommon trap blobs.
2391 //
2392 static void push_skeleton_frame(MacroAssembler* masm,
2393 /* Unchanged */
2394 Register frame_sizes_reg,
2395 Register pcs_reg,
2396 /* Invalidate */
2397 Register frame_size_reg,
2398 Register pc_reg) {
2399 BLOCK_COMMENT(" push_skeleton_frame {");
2400 __ z_lg(pc_reg, 0, pcs_reg);
2401 __ z_lg(frame_size_reg, 0, frame_sizes_reg);
2402 __ z_stg(pc_reg, _z_abi(return_pc), Z_SP);
2403 Register fp = pc_reg;
2404 __ push_frame(frame_size_reg, fp);
2405 #ifdef ASSERT
2406 // The magic is required for successful walking skeletal frames.
2407 __ load_const_optimized(frame_size_reg/*tmp*/, frame::z_istate_magic_number);
2408 __ z_stg(frame_size_reg, _z_ijava_state_neg(magic), fp);
2409 // Fill other slots that are supposedly not necessary with eye catchers.
2410 __ load_const_optimized(frame_size_reg/*use as tmp*/, 0xdeadbad1);
2411 __ z_stg(frame_size_reg, _z_ijava_state_neg(top_frame_sp), fp);
2412 // The sender_sp of the bottom frame is set before pushing it.
2413 // The sender_sp of non bottom frames is their caller's top_frame_sp, which
2414 // is unknown here. Luckily it is not needed before filling the frame in
2415 // layout_activation(), we assert this by setting an eye catcher (see
2416 // comments on sender_sp in frame_s390.hpp).
2417 __ z_stg(frame_size_reg, _z_ijava_state_neg(sender_sp), Z_SP);
2418 #endif // ASSERT
2419 BLOCK_COMMENT(" } push_skeleton_frame");
2420 }
2421
2422 // Loop through the UnrollBlock info and create new frames.
2423 static void push_skeleton_frames(MacroAssembler* masm, bool deopt,
2424 /* read */
2425 Register unroll_block_reg,
2426 /* invalidate */
2427 Register frame_sizes_reg,
2428 Register number_of_frames_reg,
2429 Register pcs_reg,
2430 Register tmp1,
2431 Register tmp2) {
2432 BLOCK_COMMENT("push_skeleton_frames {");
2433 // _number_of_frames is of type int (deoptimization.hpp).
2434 __ z_lgf(number_of_frames_reg,
2435 Address(unroll_block_reg, Deoptimization::UnrollBlock::number_of_frames_offset()));
2436 __ z_lg(pcs_reg,
2437 Address(unroll_block_reg, Deoptimization::UnrollBlock::frame_pcs_offset()));
2438 __ z_lg(frame_sizes_reg,
2439 Address(unroll_block_reg, Deoptimization::UnrollBlock::frame_sizes_offset()));
2440
2441 // stack: (caller_of_deoptee, ...).
2442
2443 // If caller_of_deoptee is a compiled frame, then we extend it to make
2444 // room for the callee's locals and the frame::z_parent_ijava_frame_abi.
2445 // See also Deoptimization::last_frame_adjust() above.
2446 // Note: entry and interpreted frames are adjusted, too. But this doesn't harm.
2447
2448 __ z_lgf(Z_R1_scratch,
2449 Address(unroll_block_reg, Deoptimization::UnrollBlock::caller_adjustment_offset()));
2450 __ z_lgr(tmp1, Z_SP); // Save the sender sp before extending the frame.
2451 __ resize_frame_sub(Z_R1_scratch, tmp2/*tmp*/);
2452 // The oldest skeletal frame requires a valid sender_sp to make it walkable
2453 // (it is required to find the original pc of caller_of_deoptee if it is marked
2454 // for deoptimization - see nmethod::orig_pc_addr()).
2455 __ z_stg(tmp1, _z_ijava_state_neg(sender_sp), Z_SP);
2456
2457 // Now push the new interpreter frames.
2458 Label loop, loop_entry;
2459
2460 // Make sure that there is at least one entry in the array.
2461 DEBUG_ONLY(__ z_ltgr(number_of_frames_reg, number_of_frames_reg));
2462 __ asm_assert(Assembler::bcondNotZero, "array_size must be > 0", 0x205);
2463
2464 __ z_bru(loop_entry);
2465
2466 __ bind(loop);
2467
2468 __ add2reg(frame_sizes_reg, wordSize);
2469 __ add2reg(pcs_reg, wordSize);
2470
2471 __ bind(loop_entry);
2472
2473 // Allocate a new frame, fill in the pc.
2474 push_skeleton_frame(masm, frame_sizes_reg, pcs_reg, tmp1, tmp2);
2475
2476 __ z_aghi(number_of_frames_reg, -1); // Emit AGHI, because it sets the condition code
2477 __ z_brne(loop);
2478
2479 // Set the top frame's return pc.
2480 __ add2reg(pcs_reg, wordSize);
2481 __ z_lg(Z_R0_scratch, 0, pcs_reg);
2482 __ z_stg(Z_R0_scratch, _z_abi(return_pc), Z_SP);
2483 BLOCK_COMMENT("} push_skeleton_frames");
2484 }
2485
2486 //------------------------------generate_deopt_blob----------------------------
2487 void SharedRuntime::generate_deopt_blob() {
2488 // Allocate space for the code.
2489 ResourceMark rm;
2490 // Setup code generation tools.
2491 CodeBuffer buffer("deopt_blob", 2048, 1024);
2492 InterpreterMacroAssembler* masm = new InterpreterMacroAssembler(&buffer);
2493 Label exec_mode_initialized;
2494 OopMap* map = nullptr;
2495 OopMapSet *oop_maps = new OopMapSet();
2496
2497 unsigned int start_off = __ offset();
2498 Label cont;
2499
2500 // --------------------------------------------------------------------------
2501 // Normal entry (non-exception case)
2502 //
2503 // We have been called from the deopt handler of the deoptee.
2504 // Z_R14 points behind the call in the deopt handler. We adjust
2505 // it such that it points to the start of the deopt handler.
2506 // The return_pc has been stored in the frame of the deoptee and
2507 // will replace the address of the deopt_handler in the call
2508 // to Deoptimization::fetch_unroll_info below.
2509 // The (int) cast is necessary, because -((unsigned int)14)
2510 // is an unsigned int.
2511 __ add2reg(Z_R14, -(int)NativeCall::max_instruction_size());
2512
2513 const Register exec_mode_reg = Z_tmp_1;
2514
2515 // stack: (deoptee, caller of deoptee, ...)
2516
2517 // pushes an "unpack" frame
2518 // R14 contains the return address pointing into the deoptimized
2519 // nmethod that was valid just before the nmethod was deoptimized.
2520 // save R14 into the deoptee frame. the `fetch_unroll_info'
2521 // procedure called below will read it from there.
2522 map = RegisterSaver::save_live_registers(masm, RegisterSaver::all_registers);
2523
2524 // note the entry point.
2525 __ load_const_optimized(exec_mode_reg, Deoptimization::Unpack_deopt);
2526 __ z_bru(exec_mode_initialized);
2527
2528 #ifndef COMPILER1
2529 int reexecute_offset = 1; // odd offset will produce odd pc, which triggers an hardware trap
2530 #else
2531 // --------------------------------------------------------------------------
2532 // Reexecute entry
2533 // - Z_R14 = Deopt Handler in nmethod
2534
2535 int reexecute_offset = __ offset() - start_off;
2536
2537 // No need to update map as each call to save_live_registers will produce identical oopmap
2538 (void) RegisterSaver::save_live_registers(masm, RegisterSaver::all_registers);
2539
2540 __ load_const_optimized(exec_mode_reg, Deoptimization::Unpack_reexecute);
2541 __ z_bru(exec_mode_initialized);
2542 #endif
2543
2544
2545 // --------------------------------------------------------------------------
2546 // Exception entry. We reached here via a branch. Registers on entry:
2547 // - Z_EXC_OOP (Z_ARG1) = exception oop
2548 // - Z_EXC_PC (Z_ARG2) = the exception pc.
2549
2550 int exception_offset = __ offset() - start_off;
2551
2552 // all registers are dead at this entry point, except for Z_EXC_OOP, and
2553 // Z_EXC_PC which contain the exception oop and exception pc
2554 // respectively. Set them in TLS and fall thru to the
2555 // unpack_with_exception_in_tls entry point.
2556
2557 // Store exception oop and pc in thread (location known to GC).
2558 // Need this since the call to "fetch_unroll_info()" may safepoint.
2559 __ z_stg(Z_EXC_OOP, Address(Z_thread, JavaThread::exception_oop_offset()));
2560 __ z_stg(Z_EXC_PC, Address(Z_thread, JavaThread::exception_pc_offset()));
2561
2562 // fall through
2563
2564 int exception_in_tls_offset = __ offset() - start_off;
2565
2566 // new implementation because exception oop is now passed in JavaThread
2567
2568 // Prolog for exception case
2569 // All registers must be preserved because they might be used by LinearScan
2570 // Exceptiop oop and throwing PC are passed in JavaThread
2571
2572 // load throwing pc from JavaThread and us it as the return address of the current frame.
2573 __ z_lg(Z_R1_scratch, Address(Z_thread, JavaThread::exception_pc_offset()));
2574
2575 // Save everything in sight.
2576 (void) RegisterSaver::save_live_registers(masm, RegisterSaver::all_registers, Z_R1_scratch);
2577
2578 // Now it is safe to overwrite any register
2579
2580 // Clear the exception pc field in JavaThread
2581 __ clear_mem(Address(Z_thread, JavaThread::exception_pc_offset()), 8);
2582
2583 // Deopt during an exception. Save exec mode for unpack_frames.
2584 __ load_const_optimized(exec_mode_reg, Deoptimization::Unpack_exception);
2585
2586
2587 #ifdef ASSERT
2588 // verify that there is really an exception oop in JavaThread
2589 __ z_lg(Z_ARG1, Address(Z_thread, JavaThread::exception_oop_offset()));
2590 __ MacroAssembler::verify_oop(Z_ARG1, FILE_AND_LINE);
2591
2592 // verify that there is no pending exception
2593 __ asm_assert_mem8_is_zero(in_bytes(Thread::pending_exception_offset()), Z_thread,
2594 "must not have pending exception here", __LINE__);
2595 #endif
2596
2597 // --------------------------------------------------------------------------
2598 // At this point, the live registers are saved and
2599 // the exec_mode_reg has been set up correctly.
2600 __ bind(exec_mode_initialized);
2601
2602 // stack: ("unpack" frame, deoptee, caller_of_deoptee, ...).
2603
2604 const Register unroll_block_reg = Z_tmp_2;
2605
2606 // we need to set `last_Java_frame' because `fetch_unroll_info' will
2607 // call `last_Java_frame()'. however we can't block and no gc will
2608 // occur so we don't need an oopmap. the value of the pc in the
2609 // frame is not particularly important. it just needs to identify the blob.
2610
2611 // Don't set last_Java_pc anymore here (is implicitly null then).
2612 // the correct PC is retrieved in pd_last_frame() in that case.
2613 __ set_last_Java_frame(/*sp*/Z_SP, noreg);
2614 // With EscapeAnalysis turned on, this call may safepoint
2615 // despite it's marked as "leaf call"!
2616 __ call_VM_leaf(CAST_FROM_FN_PTR(address, Deoptimization::fetch_unroll_info), Z_thread, exec_mode_reg);
2617 // Set an oopmap for the call site this describes all our saved volatile registers
2618 int oop_map_offs = __ offset();
2619 oop_maps->add_gc_map(oop_map_offs, map);
2620
2621 __ reset_last_Java_frame();
2622 // save the return value.
2623 __ z_lgr(unroll_block_reg, Z_RET);
2624 // restore the return registers that have been saved
2625 // (among other registers) by save_live_registers(...).
2626 RegisterSaver::restore_result_registers(masm);
2627
2628 // reload the exec mode from the UnrollBlock (it might have changed)
2629 __ z_llgf(exec_mode_reg, Address(unroll_block_reg, Deoptimization::UnrollBlock::unpack_kind_offset()));
2630
2631 // In excp_deopt_mode, restore and clear exception oop which we
2632 // stored in the thread during exception entry above. The exception
2633 // oop will be the return value of this stub.
2634 NearLabel skip_restore_excp;
2635 __ compare64_and_branch(exec_mode_reg, Deoptimization::Unpack_exception, Assembler::bcondNotEqual, skip_restore_excp);
2636 __ z_lg(Z_RET, thread_(exception_oop));
2637 __ clear_mem(thread_(exception_oop), 8);
2638 __ bind(skip_restore_excp);
2639
2640 // remove the "unpack" frame
2641 __ pop_frame();
2642
2643 // stack: (deoptee, caller of deoptee, ...).
2644
2645 // pop the deoptee's frame
2646 __ pop_frame();
2647
2648 // stack: (caller_of_deoptee, ...).
2649
2650 // loop through the `UnrollBlock' info and create interpreter frames.
2651 push_skeleton_frames(masm, true/*deopt*/,
2652 unroll_block_reg,
2653 Z_tmp_3,
2654 Z_tmp_4,
2655 Z_ARG5,
2656 Z_ARG4,
2657 Z_ARG3);
2658
2659 // stack: (skeletal interpreter frame, ..., optional skeletal
2660 // interpreter frame, caller of deoptee, ...).
2661
2662 // push an "unpack" frame taking care of float / int return values.
2663 __ push_frame(RegisterSaver::live_reg_frame_size(RegisterSaver::all_registers));
2664
2665 // stack: (unpack frame, skeletal interpreter frame, ..., optional
2666 // skeletal interpreter frame, caller of deoptee, ...).
2667
2668 // spill live volatile registers since we'll do a call.
2669 __ z_stg(Z_RET, offset_of(frame::z_abi_160_spill, spill[0]), Z_SP);
2670 __ z_std(Z_FRET, offset_of(frame::z_abi_160_spill, spill[1]), Z_SP);
2671
2672 // let the unpacker layout information in the skeletal frames just allocated.
2673 __ get_PC(Z_RET, oop_map_offs - __ offset());
2674 __ set_last_Java_frame(/*sp*/Z_SP, /*pc*/Z_RET);
2675 __ call_VM_leaf(CAST_FROM_FN_PTR(address, Deoptimization::unpack_frames),
2676 Z_thread/*thread*/, exec_mode_reg/*exec_mode*/);
2677
2678 __ reset_last_Java_frame();
2679
2680 // restore the volatiles saved above.
2681 __ z_lg(Z_RET, offset_of(frame::z_abi_160_spill, spill[0]), Z_SP);
2682 __ z_ld(Z_FRET, offset_of(frame::z_abi_160_spill, spill[1]), Z_SP);
2683
2684 // pop the "unpack" frame.
2685 __ pop_frame();
2686 __ restore_return_pc();
2687
2688 // stack: (top interpreter frame, ..., optional interpreter frame,
2689 // caller of deoptee, ...).
2690
2691 __ z_lg(Z_fp, _z_abi(callers_sp), Z_SP); // restore frame pointer
2692 __ restore_bcp();
2693 __ restore_locals();
2694 __ restore_esp();
2695
2696 // return to the interpreter entry point.
2697 __ z_br(Z_R14);
2698
2699 // Make sure all code is generated
2700 masm->flush();
2701
2702 _deopt_blob = DeoptimizationBlob::create(&buffer, oop_maps, 0, exception_offset, reexecute_offset, RegisterSaver::live_reg_frame_size(RegisterSaver::all_registers)/wordSize);
2703 _deopt_blob->set_unpack_with_exception_in_tls_offset(exception_in_tls_offset);
2704 }
2705
2706
2707 #ifdef COMPILER2
2708 //------------------------------generate_uncommon_trap_blob--------------------
2709 void SharedRuntime::generate_uncommon_trap_blob() {
2710 // Allocate space for the code
2711 ResourceMark rm;
2712 // Setup code generation tools
2713 CodeBuffer buffer("uncommon_trap_blob", 2048, 1024);
2714 InterpreterMacroAssembler* masm = new InterpreterMacroAssembler(&buffer);
2715
2716 Register unroll_block_reg = Z_tmp_1;
2717 Register klass_index_reg = Z_ARG2;
2718 Register unc_trap_reg = Z_ARG2;
2719
2720 // stack: (deoptee, 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 R14 to compiled frame.
2727 __ save_return_pc();
2728 // push the "unpack_frame".
2729 __ push_frame_abi160(0);
2730
2731 // stack: (unpack frame, deoptee, caller_of_deoptee, ...).
2732
2733 // set the "unpack" frame as last_Java_frame.
2734 // `Deoptimization::uncommon_trap' expects it and considers its
2735 // sender frame as the deoptee frame.
2736 __ get_PC(Z_R1_scratch);
2737 __ set_last_Java_frame(/*sp*/Z_SP, /*pc*/Z_R1_scratch);
2738
2739 __ z_lgr(klass_index_reg, Z_ARG1); // passed implicitly as ARG2
2740 __ z_lghi(Z_ARG3, Deoptimization::Unpack_uncommon_trap); // passed implicitly as ARG3
2741 BLOCK_COMMENT("call Deoptimization::uncommon_trap()");
2742 __ call_VM_leaf(CAST_FROM_FN_PTR(address, Deoptimization::uncommon_trap), Z_thread);
2743
2744 __ reset_last_Java_frame();
2745
2746 // pop the "unpack" frame
2747 __ pop_frame();
2748
2749 // stack: (deoptee, caller_of_deoptee, ...).
2750
2751 // save the return value.
2752 __ z_lgr(unroll_block_reg, Z_RET);
2753
2754 // pop the deoptee frame.
2755 __ pop_frame();
2756
2757 // stack: (caller_of_deoptee, ...).
2758
2759 #ifdef ASSERT
2760 assert(Immediate::is_uimm8(Deoptimization::Unpack_LIMIT), "Code not fit for larger immediates");
2761 assert(Immediate::is_uimm8(Deoptimization::Unpack_uncommon_trap), "Code not fit for larger immediates");
2762 const int unpack_kind_byte_offset = in_bytes(Deoptimization::UnrollBlock::unpack_kind_offset())
2763 #ifndef VM_LITTLE_ENDIAN
2764 + 3
2765 #endif
2766 ;
2767 if (Displacement::is_shortDisp(unpack_kind_byte_offset)) {
2768 __ z_cli(unpack_kind_byte_offset, unroll_block_reg, Deoptimization::Unpack_uncommon_trap);
2769 } else {
2770 __ z_cliy(unpack_kind_byte_offset, unroll_block_reg, Deoptimization::Unpack_uncommon_trap);
2771 }
2772 __ asm_assert(Assembler::bcondEqual, "SharedRuntime::generate_deopt_blob: expected Unpack_uncommon_trap", 0);
2773 #endif
2774
2775 __ zap_from_to(Z_SP, Z_SP, Z_R0_scratch, Z_R1, 500, -1);
2776
2777 // allocate new interpreter frame(s) and possibly resize the caller's frame
2778 // (no more adapters !)
2779 push_skeleton_frames(masm, false/*deopt*/,
2780 unroll_block_reg,
2781 Z_tmp_2,
2782 Z_tmp_3,
2783 Z_tmp_4,
2784 Z_ARG5,
2785 Z_ARG4);
2786
2787 // stack: (skeletal interpreter frame, ..., optional skeletal
2788 // interpreter frame, (resized) caller of deoptee, ...).
2789
2790 // push a dummy "unpack" frame taking care of float return values.
2791 // call `Deoptimization::unpack_frames' to layout information in the
2792 // interpreter frames just created
2793
2794 // push the "unpack" frame
2795 const unsigned int framesize_in_bytes = __ push_frame_abi160(0);
2796
2797 // stack: (unpack frame, skeletal interpreter frame, ..., optional
2798 // skeletal interpreter frame, (resized) caller of deoptee, ...).
2799
2800 // set the "unpack" frame as last_Java_frame
2801 __ get_PC(Z_R1_scratch);
2802 __ set_last_Java_frame(/*sp*/Z_SP, /*pc*/Z_R1_scratch);
2803
2804 // indicate it is the uncommon trap case
2805 BLOCK_COMMENT("call Deoptimization::Unpack_uncommon_trap()");
2806 __ load_const_optimized(unc_trap_reg, Deoptimization::Unpack_uncommon_trap);
2807 // let the unpacker layout information in the skeletal frames just allocated.
2808 __ call_VM_leaf(CAST_FROM_FN_PTR(address, Deoptimization::unpack_frames), Z_thread);
2809
2810 __ reset_last_Java_frame();
2811 // pop the "unpack" frame
2812 __ pop_frame();
2813 // restore LR from top interpreter frame
2814 __ restore_return_pc();
2815
2816 // stack: (top interpreter frame, ..., optional interpreter frame,
2817 // (resized) caller of deoptee, ...).
2818
2819 __ z_lg(Z_fp, _z_abi(callers_sp), Z_SP); // restore frame pointer
2820 __ restore_bcp();
2821 __ restore_locals();
2822 __ restore_esp();
2823
2824 // return to the interpreter entry point
2825 __ z_br(Z_R14);
2826
2827 masm->flush();
2828 _uncommon_trap_blob = UncommonTrapBlob::create(&buffer, nullptr, framesize_in_bytes/wordSize);
2829 }
2830 #endif // COMPILER2
2831
2832
2833 //------------------------------generate_handler_blob------
2834 //
2835 // Generate a special Compile2Runtime blob that saves all registers,
2836 // and setup oopmap.
2837 SafepointBlob* SharedRuntime::generate_handler_blob(address call_ptr, int poll_type) {
2838 assert(StubRoutines::forward_exception_entry() != nullptr,
2839 "must be generated before");
2840
2841 ResourceMark rm;
2842 OopMapSet *oop_maps = new OopMapSet();
2843 OopMap* map;
2844
2845 // Allocate space for the code. Setup code generation tools.
2846 CodeBuffer buffer("handler_blob", 2048, 1024);
2847 MacroAssembler* masm = new MacroAssembler(&buffer);
2848
2849 unsigned int start_off = __ offset();
2850 address call_pc = nullptr;
2851 int frame_size_in_bytes;
2852
2853 bool cause_return = (poll_type == POLL_AT_RETURN);
2854 // Make room for return address (or push it again)
2855 if (!cause_return) {
2856 __ z_lg(Z_R14, Address(Z_thread, JavaThread::saved_exception_pc_offset()));
2857 }
2858
2859 // Save registers, fpu state, and flags
2860 map = RegisterSaver::save_live_registers(masm, RegisterSaver::all_registers);
2861
2862 if (!cause_return) {
2863 // Keep a copy of the return pc to detect if it gets modified.
2864 __ z_lgr(Z_R6, Z_R14);
2865 }
2866
2867 // The following is basically a call_VM. However, we need the precise
2868 // address of the call in order to generate an oopmap. Hence, we do all the
2869 // work ourselves.
2870 __ set_last_Java_frame(Z_SP, noreg);
2871
2872 // call into the runtime to handle the safepoint poll
2873 __ call_VM_leaf(call_ptr, Z_thread);
2874
2875
2876 // Set an oopmap for the call site. This oopmap will map all
2877 // oop-registers and debug-info registers as callee-saved. This
2878 // will allow deoptimization at this safepoint to find all possible
2879 // debug-info recordings, as well as let GC find all oops.
2880
2881 oop_maps->add_gc_map((int)(__ offset()-start_off), map);
2882
2883 Label noException;
2884
2885 __ reset_last_Java_frame();
2886
2887 __ load_and_test_long(Z_R1, thread_(pending_exception));
2888 __ z_bre(noException);
2889
2890 // Pending exception case, used (sporadically) by
2891 // api/java_lang/Thread.State/index#ThreadState et al.
2892 RegisterSaver::restore_live_registers(masm, RegisterSaver::all_registers);
2893
2894 // Jump to forward_exception_entry, with the issuing PC in Z_R14
2895 // so it looks like the original nmethod called forward_exception_entry.
2896 __ load_const_optimized(Z_R1_scratch, StubRoutines::forward_exception_entry());
2897 __ z_br(Z_R1_scratch);
2898
2899 // No exception case
2900 __ bind(noException);
2901
2902 if (!cause_return) {
2903 Label no_adjust;
2904 // If our stashed return pc was modified by the runtime we avoid touching it
2905 const int offset_of_return_pc = _z_common_abi(return_pc) + RegisterSaver::live_reg_frame_size(RegisterSaver::all_registers);
2906 __ z_cg(Z_R6, offset_of_return_pc, Z_SP);
2907 __ z_brne(no_adjust);
2908
2909 // Adjust return pc forward to step over the safepoint poll instruction
2910 __ instr_size(Z_R1_scratch, Z_R6);
2911 __ z_agr(Z_R6, Z_R1_scratch);
2912 __ z_stg(Z_R6, offset_of_return_pc, Z_SP);
2913
2914 __ bind(no_adjust);
2915 }
2916
2917 // Normal exit, restore registers and exit.
2918 RegisterSaver::restore_live_registers(masm, RegisterSaver::all_registers);
2919
2920 __ z_br(Z_R14);
2921
2922 // Make sure all code is generated
2923 masm->flush();
2924
2925 // Fill-out other meta info
2926 return SafepointBlob::create(&buffer, oop_maps, RegisterSaver::live_reg_frame_size(RegisterSaver::all_registers)/wordSize);
2927 }
2928
2929
2930 //
2931 // generate_resolve_blob - call resolution (static/virtual/opt-virtual/ic-miss
2932 //
2933 // Generate a stub that calls into vm to find out the proper destination
2934 // of a Java call. All the argument registers are live at this point
2935 // but since this is generic code we don't know what they are and the caller
2936 // must do any gc of the args.
2937 //
2938 RuntimeStub* SharedRuntime::generate_resolve_blob(address destination, const char* name) {
2939 assert (StubRoutines::forward_exception_entry() != nullptr, "must be generated before");
2940
2941 // allocate space for the code
2942 ResourceMark rm;
2943
2944 CodeBuffer buffer(name, 1000, 512);
2945 MacroAssembler* masm = new MacroAssembler(&buffer);
2946
2947 OopMapSet *oop_maps = new OopMapSet();
2948 OopMap* map = nullptr;
2949
2950 unsigned int start_off = __ offset();
2951
2952 map = RegisterSaver::save_live_registers(masm, RegisterSaver::all_registers);
2953
2954 // We must save a PC from within the stub as return PC
2955 // C code doesn't store the LR where we expect the PC,
2956 // so we would run into trouble upon stack walking.
2957 __ get_PC(Z_R1_scratch);
2958
2959 unsigned int frame_complete = __ offset();
2960
2961 __ set_last_Java_frame(/*sp*/Z_SP, Z_R1_scratch);
2962
2963 __ call_VM_leaf(destination, Z_thread, Z_method);
2964
2965
2966 // Set an oopmap for the call site.
2967 // We need this not only for callee-saved registers, but also for volatile
2968 // registers that the compiler might be keeping live across a safepoint.
2969
2970 oop_maps->add_gc_map((int)(frame_complete-start_off), map);
2971
2972 // clear last_Java_sp
2973 __ reset_last_Java_frame();
2974
2975 // check for pending exceptions
2976 Label pending;
2977 __ load_and_test_long(Z_R0, Address(Z_thread, Thread::pending_exception_offset()));
2978 __ z_brne(pending);
2979
2980 __ z_lgr(Z_R1_scratch, Z_R2); // r1 is neither saved nor restored, r2 contains the continuation.
2981 RegisterSaver::restore_live_registers(masm, RegisterSaver::all_registers);
2982
2983 // get the returned method
2984 __ get_vm_result_2(Z_method);
2985
2986 // We are back to the original state on entry and ready to go.
2987 __ z_br(Z_R1_scratch);
2988
2989 // Pending exception after the safepoint
2990
2991 __ bind(pending);
2992
2993 RegisterSaver::restore_live_registers(masm, RegisterSaver::all_registers);
2994
2995 // exception pending => remove activation and forward to exception handler
2996
2997 __ z_lgr(Z_R2, Z_R0); // pending_exception
2998 __ clear_mem(Address(Z_thread, JavaThread::vm_result_offset()), sizeof(jlong));
2999 __ load_const_optimized(Z_R1_scratch, StubRoutines::forward_exception_entry());
3000 __ z_br(Z_R1_scratch);
3001
3002 // -------------
3003 // make sure all code is generated
3004 masm->flush();
3005
3006 // return the blob
3007 // frame_size_words or bytes??
3008 return RuntimeStub::new_runtime_stub(name, &buffer, frame_complete, RegisterSaver::live_reg_frame_size(RegisterSaver::all_registers)/wordSize,
3009 oop_maps, true);
3010
3011 }
3012
3013 //------------------------------Montgomery multiplication------------------------
3014 //
3015
3016 // Subtract 0:b from carry:a. Return carry.
3017 static unsigned long
3018 sub(unsigned long a[], unsigned long b[], unsigned long carry, long len) {
3019 unsigned long i, c = 8 * (unsigned long)(len - 1);
3020 __asm__ __volatile__ (
3021 "SLGR %[i], %[i] \n" // initialize to 0 and pre-set carry
3022 "LGHI 0, 8 \n" // index increment (for BRXLG)
3023 "LGR 1, %[c] \n" // index limit (for BRXLG)
3024 "0: \n"
3025 "LG %[c], 0(%[i],%[a]) \n"
3026 "SLBG %[c], 0(%[i],%[b]) \n" // subtract with borrow
3027 "STG %[c], 0(%[i],%[a]) \n"
3028 "BRXLG %[i], 0, 0b \n" // while ((i+=8)<limit);
3029 "SLBGR %[c], %[c] \n" // save carry - 1
3030 : [i]"=&a"(i), [c]"+r"(c)
3031 : [a]"a"(a), [b]"a"(b)
3032 : "cc", "memory", "r0", "r1"
3033 );
3034 return carry + c;
3035 }
3036
3037 // Multiply (unsigned) Long A by Long B, accumulating the double-
3038 // length result into the accumulator formed of T0, T1, and T2.
3039 inline void MACC(unsigned long A[], long A_ind,
3040 unsigned long B[], long B_ind,
3041 unsigned long &T0, unsigned long &T1, unsigned long &T2) {
3042 long A_si = 8 * A_ind,
3043 B_si = 8 * B_ind;
3044 __asm__ __volatile__ (
3045 "LG 1, 0(%[A_si],%[A]) \n"
3046 "MLG 0, 0(%[B_si],%[B]) \n" // r0r1 = A * B
3047 "ALGR %[T0], 1 \n"
3048 "LGHI 1, 0 \n" // r1 = 0
3049 "ALCGR %[T1], 0 \n"
3050 "ALCGR %[T2], 1 \n"
3051 : [T0]"+r"(T0), [T1]"+r"(T1), [T2]"+r"(T2)
3052 : [A]"r"(A), [A_si]"r"(A_si), [B]"r"(B), [B_si]"r"(B_si)
3053 : "cc", "r0", "r1"
3054 );
3055 }
3056
3057 // As above, but add twice the double-length result into the
3058 // accumulator.
3059 inline void MACC2(unsigned long A[], long A_ind,
3060 unsigned long B[], long B_ind,
3061 unsigned long &T0, unsigned long &T1, unsigned long &T2) {
3062 const unsigned long zero = 0;
3063 long A_si = 8 * A_ind,
3064 B_si = 8 * B_ind;
3065 __asm__ __volatile__ (
3066 "LG 1, 0(%[A_si],%[A]) \n"
3067 "MLG 0, 0(%[B_si],%[B]) \n" // r0r1 = A * B
3068 "ALGR %[T0], 1 \n"
3069 "ALCGR %[T1], 0 \n"
3070 "ALCGR %[T2], %[zero] \n"
3071 "ALGR %[T0], 1 \n"
3072 "ALCGR %[T1], 0 \n"
3073 "ALCGR %[T2], %[zero] \n"
3074 : [T0]"+r"(T0), [T1]"+r"(T1), [T2]"+r"(T2)
3075 : [A]"r"(A), [A_si]"r"(A_si), [B]"r"(B), [B_si]"r"(B_si), [zero]"r"(zero)
3076 : "cc", "r0", "r1"
3077 );
3078 }
3079
3080 // Fast Montgomery multiplication. The derivation of the algorithm is
3081 // in "A Cryptographic Library for the Motorola DSP56000,
3082 // Dusse and Kaliski, Proc. EUROCRYPT 90, pp. 230-237".
3083 static void
3084 montgomery_multiply(unsigned long a[], unsigned long b[], unsigned long n[],
3085 unsigned long m[], unsigned long inv, int len) {
3086 unsigned long t0 = 0, t1 = 0, t2 = 0; // Triple-precision accumulator
3087 int i;
3088
3089 assert(inv * n[0] == -1UL, "broken inverse in Montgomery multiply");
3090
3091 for (i = 0; i < len; i++) {
3092 int j;
3093 for (j = 0; j < i; j++) {
3094 MACC(a, j, b, i-j, t0, t1, t2);
3095 MACC(m, j, n, i-j, t0, t1, t2);
3096 }
3097 MACC(a, i, b, 0, t0, t1, t2);
3098 m[i] = t0 * inv;
3099 MACC(m, i, n, 0, t0, t1, t2);
3100
3101 assert(t0 == 0, "broken Montgomery multiply");
3102
3103 t0 = t1; t1 = t2; t2 = 0;
3104 }
3105
3106 for (i = len; i < 2 * len; i++) {
3107 int j;
3108 for (j = i - len + 1; j < len; j++) {
3109 MACC(a, j, b, i-j, t0, t1, t2);
3110 MACC(m, j, n, i-j, t0, t1, t2);
3111 }
3112 m[i-len] = t0;
3113 t0 = t1; t1 = t2; t2 = 0;
3114 }
3115
3116 while (t0) {
3117 t0 = sub(m, n, t0, len);
3118 }
3119 }
3120
3121 // Fast Montgomery squaring. This uses asymptotically 25% fewer
3122 // multiplies so it should be up to 25% faster than Montgomery
3123 // multiplication. However, its loop control is more complex and it
3124 // may actually run slower on some machines.
3125 static void
3126 montgomery_square(unsigned long a[], unsigned long n[],
3127 unsigned long m[], unsigned long inv, int len) {
3128 unsigned long t0 = 0, t1 = 0, t2 = 0; // Triple-precision accumulator
3129 int i;
3130
3131 assert(inv * n[0] == -1UL, "broken inverse in Montgomery multiply");
3132
3133 for (i = 0; i < len; i++) {
3134 int j;
3135 int end = (i+1)/2;
3136 for (j = 0; j < end; j++) {
3137 MACC2(a, j, a, i-j, t0, t1, t2);
3138 MACC(m, j, n, i-j, t0, t1, t2);
3139 }
3140 if ((i & 1) == 0) {
3141 MACC(a, j, a, j, t0, t1, t2);
3142 }
3143 for (; j < i; j++) {
3144 MACC(m, j, n, i-j, t0, t1, t2);
3145 }
3146 m[i] = t0 * inv;
3147 MACC(m, i, n, 0, t0, t1, t2);
3148
3149 assert(t0 == 0, "broken Montgomery square");
3150
3151 t0 = t1; t1 = t2; t2 = 0;
3152 }
3153
3154 for (i = len; i < 2*len; i++) {
3155 int start = i-len+1;
3156 int end = start + (len - start)/2;
3157 int j;
3158 for (j = start; j < end; j++) {
3159 MACC2(a, j, a, i-j, t0, t1, t2);
3160 MACC(m, j, n, i-j, t0, t1, t2);
3161 }
3162 if ((i & 1) == 0) {
3163 MACC(a, j, a, j, t0, t1, t2);
3164 }
3165 for (; j < len; j++) {
3166 MACC(m, j, n, i-j, t0, t1, t2);
3167 }
3168 m[i-len] = t0;
3169 t0 = t1; t1 = t2; t2 = 0;
3170 }
3171
3172 while (t0) {
3173 t0 = sub(m, n, t0, len);
3174 }
3175 }
3176
3177 // The threshold at which squaring is advantageous was determined
3178 // experimentally on an i7-3930K (Ivy Bridge) CPU @ 3.5GHz.
3179 // Value seems to be ok for other platforms, too.
3180 #define MONTGOMERY_SQUARING_THRESHOLD 64
3181
3182 // Copy len longwords from s to d, word-swapping as we go. The
3183 // destination array is reversed.
3184 static void reverse_words(unsigned long *s, unsigned long *d, int len) {
3185 d += len;
3186 while(len-- > 0) {
3187 d--;
3188 unsigned long s_val = *s;
3189 // Swap words in a longword on little endian machines.
3190 #ifdef VM_LITTLE_ENDIAN
3191 Unimplemented();
3192 #endif
3193 *d = s_val;
3194 s++;
3195 }
3196 }
3197
3198 void SharedRuntime::montgomery_multiply(jint *a_ints, jint *b_ints, jint *n_ints,
3199 jint len, jlong inv,
3200 jint *m_ints) {
3201 len = len & 0x7fffFFFF; // C2 does not respect int to long conversion for stub calls.
3202 assert(len % 2 == 0, "array length in montgomery_multiply must be even");
3203 int longwords = len/2;
3204
3205 // Make very sure we don't use so much space that the stack might
3206 // overflow. 512 jints corresponds to an 16384-bit integer and
3207 // will use here a total of 8k bytes of stack space.
3208 int divisor = sizeof(unsigned long) * 4;
3209 guarantee(longwords <= 8192 / divisor, "must be");
3210 int total_allocation = longwords * sizeof (unsigned long) * 4;
3211 unsigned long *scratch = (unsigned long *)alloca(total_allocation);
3212
3213 // Local scratch arrays
3214 unsigned long
3215 *a = scratch + 0 * longwords,
3216 *b = scratch + 1 * longwords,
3217 *n = scratch + 2 * longwords,
3218 *m = scratch + 3 * longwords;
3219
3220 reverse_words((unsigned long *)a_ints, a, longwords);
3221 reverse_words((unsigned long *)b_ints, b, longwords);
3222 reverse_words((unsigned long *)n_ints, n, longwords);
3223
3224 ::montgomery_multiply(a, b, n, m, (unsigned long)inv, longwords);
3225
3226 reverse_words(m, (unsigned long *)m_ints, longwords);
3227 }
3228
3229 void SharedRuntime::montgomery_square(jint *a_ints, jint *n_ints,
3230 jint len, jlong inv,
3231 jint *m_ints) {
3232 len = len & 0x7fffFFFF; // C2 does not respect int to long conversion for stub calls.
3233 assert(len % 2 == 0, "array length in montgomery_square must be even");
3234 int longwords = len/2;
3235
3236 // Make very sure we don't use so much space that the stack might
3237 // overflow. 512 jints corresponds to an 16384-bit integer and
3238 // will use here a total of 6k bytes of stack space.
3239 int divisor = sizeof(unsigned long) * 3;
3240 guarantee(longwords <= (8192 / divisor), "must be");
3241 int total_allocation = longwords * sizeof (unsigned long) * 3;
3242 unsigned long *scratch = (unsigned long *)alloca(total_allocation);
3243
3244 // Local scratch arrays
3245 unsigned long
3246 *a = scratch + 0 * longwords,
3247 *n = scratch + 1 * longwords,
3248 *m = scratch + 2 * longwords;
3249
3250 reverse_words((unsigned long *)a_ints, a, longwords);
3251 reverse_words((unsigned long *)n_ints, n, longwords);
3252
3253 if (len >= MONTGOMERY_SQUARING_THRESHOLD) {
3254 ::montgomery_square(a, n, m, (unsigned long)inv, longwords);
3255 } else {
3256 ::montgomery_multiply(a, a, n, m, (unsigned long)inv, longwords);
3257 }
3258
3259 reverse_words(m, (unsigned long *)m_ints, longwords);
3260 }
3261
3262 extern "C"
3263 int SpinPause() {
3264 return 0;
3265 }