1 /*
2 * Copyright (c) 2003, 2025, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2014, 2021, Red Hat Inc. All rights reserved.
4 * Copyright (c) 2021, Azul Systems, Inc. All rights reserved.
5 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 *
7 * This code is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License version 2 only, as
9 * published by the Free Software Foundation.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 *
25 */
26
27 #include "asm/macroAssembler.hpp"
28 #include "asm/macroAssembler.inline.hpp"
29 #include "code/codeCache.hpp"
30 #include "code/compiledIC.hpp"
31 #include "code/debugInfoRec.hpp"
32 #include "code/vtableStubs.hpp"
33 #include "compiler/oopMap.hpp"
34 #include "gc/shared/barrierSetAssembler.hpp"
35 #include "interpreter/interpreter.hpp"
36 #include "interpreter/interp_masm.hpp"
37 #include "logging/log.hpp"
38 #include "memory/resourceArea.hpp"
39 #include "nativeInst_aarch64.hpp"
40 #include "oops/klass.inline.hpp"
41 #include "oops/method.inline.hpp"
42 #include "prims/methodHandles.hpp"
43 #include "runtime/continuation.hpp"
44 #include "runtime/continuationEntry.inline.hpp"
45 #include "runtime/globals.hpp"
46 #include "runtime/jniHandles.hpp"
47 #include "runtime/safepointMechanism.hpp"
48 #include "runtime/sharedRuntime.hpp"
49 #include "runtime/signature.hpp"
50 #include "runtime/stubRoutines.hpp"
51 #include "runtime/timerTrace.hpp"
52 #include "runtime/vframeArray.hpp"
53 #include "utilities/align.hpp"
54 #include "utilities/formatBuffer.hpp"
55 #include "vmreg_aarch64.inline.hpp"
56 #ifdef COMPILER1
57 #include "c1/c1_Runtime1.hpp"
58 #endif
59 #ifdef COMPILER2
60 #include "adfiles/ad_aarch64.hpp"
61 #include "opto/runtime.hpp"
62 #endif
63 #if INCLUDE_JVMCI
64 #include "jvmci/jvmciJavaClasses.hpp"
65 #endif
66
67 #define __ masm->
68
69 #ifdef PRODUCT
70 #define BLOCK_COMMENT(str) /* nothing */
71 #else
72 #define BLOCK_COMMENT(str) __ block_comment(str)
73 #endif
74
75 const int StackAlignmentInSlots = StackAlignmentInBytes / VMRegImpl::stack_slot_size;
76
77 // FIXME -- this is used by C1
78 class RegisterSaver {
79 const bool _save_vectors;
80 public:
81 RegisterSaver(bool save_vectors) : _save_vectors(save_vectors) {}
82
83 OopMap* save_live_registers(MacroAssembler* masm, int additional_frame_words, int* total_frame_words);
84 void restore_live_registers(MacroAssembler* masm);
85
86 // Offsets into the register save area
87 // Used by deoptimization when it is managing result register
88 // values on its own
89
90 int reg_offset_in_bytes(Register r);
91 int r0_offset_in_bytes() { return reg_offset_in_bytes(r0); }
92 int rscratch1_offset_in_bytes() { return reg_offset_in_bytes(rscratch1); }
93 int v0_offset_in_bytes();
94
95 // Total stack size in bytes for saving sve predicate registers.
96 int total_sve_predicate_in_bytes();
97
98 // Capture info about frame layout
99 // Note this is only correct when not saving full vectors.
100 enum layout {
101 fpu_state_off = 0,
102 fpu_state_end = fpu_state_off + FPUStateSizeInWords - 1,
103 // The frame sender code expects that rfp will be in
104 // the "natural" place and will override any oopMap
105 // setting for it. We must therefore force the layout
106 // so that it agrees with the frame sender code.
107 r0_off = fpu_state_off + FPUStateSizeInWords,
108 rfp_off = r0_off + (Register::number_of_registers - 2) * Register::max_slots_per_register,
109 return_off = rfp_off + Register::max_slots_per_register, // slot for return address
110 reg_save_size = return_off + Register::max_slots_per_register};
111
112 };
113
114 int RegisterSaver::reg_offset_in_bytes(Register r) {
115 // The integer registers are located above the floating point
116 // registers in the stack frame pushed by save_live_registers() so the
117 // offset depends on whether we are saving full vectors, and whether
118 // those vectors are NEON or SVE.
119
120 int slots_per_vect = FloatRegister::save_slots_per_register;
121
122 #if COMPILER2_OR_JVMCI
123 if (_save_vectors) {
124 slots_per_vect = FloatRegister::slots_per_neon_register;
125
126 #ifdef COMPILER2
127 if (Matcher::supports_scalable_vector()) {
128 slots_per_vect = Matcher::scalable_vector_reg_size(T_FLOAT);
129 }
130 #endif
131 }
132 #endif
133
134 int r0_offset = v0_offset_in_bytes() + (slots_per_vect * FloatRegister::number_of_registers) * BytesPerInt;
135 return r0_offset + r->encoding() * wordSize;
136 }
137
138 int RegisterSaver::v0_offset_in_bytes() {
139 // The floating point registers are located above the predicate registers if
140 // they are present in the stack frame pushed by save_live_registers(). So the
141 // offset depends on the saved total predicate vectors in the stack frame.
142 return (total_sve_predicate_in_bytes() / VMRegImpl::stack_slot_size) * BytesPerInt;
143 }
144
145 int RegisterSaver::total_sve_predicate_in_bytes() {
146 #ifdef COMPILER2
147 if (_save_vectors && Matcher::supports_scalable_vector()) {
148 return (Matcher::scalable_vector_reg_size(T_BYTE) >> LogBitsPerByte) *
149 PRegister::number_of_registers;
150 }
151 #endif
152 return 0;
153 }
154
155 OopMap* RegisterSaver::save_live_registers(MacroAssembler* masm, int additional_frame_words, int* total_frame_words) {
156 bool use_sve = false;
157 int sve_vector_size_in_bytes = 0;
158 int sve_vector_size_in_slots = 0;
159 int sve_predicate_size_in_slots = 0;
160 int total_predicate_in_bytes = total_sve_predicate_in_bytes();
161 int total_predicate_in_slots = total_predicate_in_bytes / VMRegImpl::stack_slot_size;
162
163 #ifdef COMPILER2
164 use_sve = Matcher::supports_scalable_vector();
165 if (use_sve) {
166 sve_vector_size_in_bytes = Matcher::scalable_vector_reg_size(T_BYTE);
167 sve_vector_size_in_slots = Matcher::scalable_vector_reg_size(T_FLOAT);
168 sve_predicate_size_in_slots = Matcher::scalable_predicate_reg_slots();
169 }
170 #endif
171
172 #if COMPILER2_OR_JVMCI
173 if (_save_vectors) {
174 int extra_save_slots_per_register = 0;
175 // Save upper half of vector registers
176 if (use_sve) {
177 extra_save_slots_per_register = sve_vector_size_in_slots - FloatRegister::save_slots_per_register;
178 } else {
179 extra_save_slots_per_register = FloatRegister::extra_save_slots_per_neon_register;
180 }
181 int extra_vector_bytes = extra_save_slots_per_register *
182 VMRegImpl::stack_slot_size *
183 FloatRegister::number_of_registers;
184 additional_frame_words += ((extra_vector_bytes + total_predicate_in_bytes) / wordSize);
185 }
186 #else
187 assert(!_save_vectors, "vectors are generated only by C2 and JVMCI");
188 #endif
189
190 int frame_size_in_bytes = align_up(additional_frame_words * wordSize +
191 reg_save_size * BytesPerInt, 16);
192 // OopMap frame size is in compiler stack slots (jint's) not bytes or words
193 int frame_size_in_slots = frame_size_in_bytes / BytesPerInt;
194 // The caller will allocate additional_frame_words
195 int additional_frame_slots = additional_frame_words * wordSize / BytesPerInt;
196 // CodeBlob frame size is in words.
197 int frame_size_in_words = frame_size_in_bytes / wordSize;
198 *total_frame_words = frame_size_in_words;
199
200 // Save Integer and Float registers.
201 __ enter();
202 __ push_CPU_state(_save_vectors, use_sve, sve_vector_size_in_bytes, total_predicate_in_bytes);
203
204 // Set an oopmap for the call site. This oopmap will map all
205 // oop-registers and debug-info registers as callee-saved. This
206 // will allow deoptimization at this safepoint to find all possible
207 // debug-info recordings, as well as let GC find all oops.
208
209 OopMapSet *oop_maps = new OopMapSet();
210 OopMap* oop_map = new OopMap(frame_size_in_slots, 0);
211
212 for (int i = 0; i < Register::number_of_registers; i++) {
213 Register r = as_Register(i);
214 if (i <= rfp->encoding() && r != rscratch1 && r != rscratch2) {
215 // SP offsets are in 4-byte words.
216 // Register slots are 8 bytes wide, 32 floating-point registers.
217 int sp_offset = Register::max_slots_per_register * i +
218 FloatRegister::save_slots_per_register * FloatRegister::number_of_registers;
219 oop_map->set_callee_saved(VMRegImpl::stack2reg(sp_offset + additional_frame_slots), r->as_VMReg());
220 }
221 }
222
223 for (int i = 0; i < FloatRegister::number_of_registers; i++) {
224 FloatRegister r = as_FloatRegister(i);
225 int sp_offset = 0;
226 if (_save_vectors) {
227 sp_offset = use_sve ? (total_predicate_in_slots + sve_vector_size_in_slots * i) :
228 (FloatRegister::slots_per_neon_register * i);
229 } else {
230 sp_offset = FloatRegister::save_slots_per_register * i;
231 }
232 oop_map->set_callee_saved(VMRegImpl::stack2reg(sp_offset), r->as_VMReg());
233 }
234
235 return oop_map;
236 }
237
238 void RegisterSaver::restore_live_registers(MacroAssembler* masm) {
239 #ifdef COMPILER2
240 __ pop_CPU_state(_save_vectors, Matcher::supports_scalable_vector(),
241 Matcher::scalable_vector_reg_size(T_BYTE), total_sve_predicate_in_bytes());
242 #else
243 #if !INCLUDE_JVMCI
244 assert(!_save_vectors, "vectors are generated only by C2 and JVMCI");
245 #endif
246 __ pop_CPU_state(_save_vectors);
247 #endif
248 __ ldp(rfp, lr, Address(__ post(sp, 2 * wordSize)));
249 __ authenticate_return_address();
250 }
251
252 // Is vector's size (in bytes) bigger than a size saved by default?
253 // 8 bytes vector registers are saved by default on AArch64.
254 // The SVE supported min vector size is 8 bytes and we need to save
255 // predicate registers when the vector size is 8 bytes as well.
256 bool SharedRuntime::is_wide_vector(int size) {
257 return size > 8 || (UseSVE > 0 && size >= 8);
258 }
259
260 // ---------------------------------------------------------------------------
261 // Read the array of BasicTypes from a signature, and compute where the
262 // arguments should go. Values in the VMRegPair regs array refer to 4-byte
263 // quantities. Values less than VMRegImpl::stack0 are registers, those above
264 // refer to 4-byte stack slots. All stack slots are based off of the stack pointer
265 // as framesizes are fixed.
266 // VMRegImpl::stack0 refers to the first slot 0(sp).
267 // and VMRegImpl::stack0+1 refers to the memory word 4-byes higher.
268 // Register up to Register::number_of_registers are the 64-bit
269 // integer registers.
270
271 // Note: the INPUTS in sig_bt are in units of Java argument words,
272 // which are 64-bit. The OUTPUTS are in 32-bit units.
273
274 // The Java calling convention is a "shifted" version of the C ABI.
275 // By skipping the first C ABI register we can call non-static jni
276 // methods with small numbers of arguments without having to shuffle
277 // the arguments at all. Since we control the java ABI we ought to at
278 // least get some advantage out of it.
279
280 int SharedRuntime::java_calling_convention(const BasicType *sig_bt,
281 VMRegPair *regs,
282 int total_args_passed) {
283
284 // Create the mapping between argument positions and
285 // registers.
286 static const Register INT_ArgReg[Argument::n_int_register_parameters_j] = {
287 j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5, j_rarg6, j_rarg7
288 };
289 static const FloatRegister FP_ArgReg[Argument::n_float_register_parameters_j] = {
290 j_farg0, j_farg1, j_farg2, j_farg3,
291 j_farg4, j_farg5, j_farg6, j_farg7
292 };
293
294
295 uint int_args = 0;
296 uint fp_args = 0;
297 uint stk_args = 0;
298
299 for (int i = 0; i < total_args_passed; i++) {
300 switch (sig_bt[i]) {
301 case T_BOOLEAN:
302 case T_CHAR:
303 case T_BYTE:
304 case T_SHORT:
305 case T_INT:
306 if (int_args < Argument::n_int_register_parameters_j) {
307 regs[i].set1(INT_ArgReg[int_args++]->as_VMReg());
308 } else {
309 stk_args = align_up(stk_args, 2);
310 regs[i].set1(VMRegImpl::stack2reg(stk_args));
311 stk_args += 1;
312 }
313 break;
314 case T_VOID:
315 // halves of T_LONG or T_DOUBLE
316 assert(i != 0 && (sig_bt[i - 1] == T_LONG || sig_bt[i - 1] == T_DOUBLE), "expecting half");
317 regs[i].set_bad();
318 break;
319 case T_LONG:
320 assert((i + 1) < total_args_passed && sig_bt[i + 1] == T_VOID, "expecting half");
321 // fall through
322 case T_OBJECT:
323 case T_ARRAY:
324 case T_ADDRESS:
325 if (int_args < Argument::n_int_register_parameters_j) {
326 regs[i].set2(INT_ArgReg[int_args++]->as_VMReg());
327 } else {
328 stk_args = align_up(stk_args, 2);
329 regs[i].set2(VMRegImpl::stack2reg(stk_args));
330 stk_args += 2;
331 }
332 break;
333 case T_FLOAT:
334 if (fp_args < Argument::n_float_register_parameters_j) {
335 regs[i].set1(FP_ArgReg[fp_args++]->as_VMReg());
336 } else {
337 stk_args = align_up(stk_args, 2);
338 regs[i].set1(VMRegImpl::stack2reg(stk_args));
339 stk_args += 1;
340 }
341 break;
342 case T_DOUBLE:
343 assert((i + 1) < total_args_passed && sig_bt[i + 1] == T_VOID, "expecting half");
344 if (fp_args < Argument::n_float_register_parameters_j) {
345 regs[i].set2(FP_ArgReg[fp_args++]->as_VMReg());
346 } else {
347 stk_args = align_up(stk_args, 2);
348 regs[i].set2(VMRegImpl::stack2reg(stk_args));
349 stk_args += 2;
350 }
351 break;
352 default:
353 ShouldNotReachHere();
354 break;
355 }
356 }
357
358 return stk_args;
359 }
360
361 // Patch the callers callsite with entry to compiled code if it exists.
362 static void patch_callers_callsite(MacroAssembler *masm) {
363 Label L;
364 __ ldr(rscratch1, Address(rmethod, in_bytes(Method::code_offset())));
365 __ cbz(rscratch1, L);
366
367 __ enter();
368 __ push_CPU_state();
369
370 // VM needs caller's callsite
371 // VM needs target method
372 // This needs to be a long call since we will relocate this adapter to
373 // the codeBuffer and it may not reach
374
375 #ifndef PRODUCT
376 assert(frame::arg_reg_save_area_bytes == 0, "not expecting frame reg save area");
377 #endif
378
379 __ mov(c_rarg0, rmethod);
380 __ mov(c_rarg1, lr);
381 __ authenticate_return_address(c_rarg1);
382 __ lea(rscratch1, RuntimeAddress(CAST_FROM_FN_PTR(address, SharedRuntime::fixup_callers_callsite)));
383 __ blr(rscratch1);
384
385 // Explicit isb required because fixup_callers_callsite may change the code
386 // stream.
387 __ safepoint_isb();
388
389 __ pop_CPU_state();
390 // restore sp
391 __ leave();
392 __ bind(L);
393 }
394
395 static void gen_c2i_adapter(MacroAssembler *masm,
396 int total_args_passed,
397 int comp_args_on_stack,
398 const BasicType *sig_bt,
399 const VMRegPair *regs,
400 Label& skip_fixup) {
401 // Before we get into the guts of the C2I adapter, see if we should be here
402 // at all. We've come from compiled code and are attempting to jump to the
403 // interpreter, which means the caller made a static call to get here
404 // (vcalls always get a compiled target if there is one). Check for a
405 // compiled target. If there is one, we need to patch the caller's call.
406 patch_callers_callsite(masm);
407
408 __ bind(skip_fixup);
409
410 int words_pushed = 0;
411
412 // Since all args are passed on the stack, total_args_passed *
413 // Interpreter::stackElementSize is the space we need.
414
415 int extraspace = total_args_passed * Interpreter::stackElementSize;
416
417 __ mov(r19_sender_sp, sp);
418
419 // stack is aligned, keep it that way
420 extraspace = align_up(extraspace, 2*wordSize);
421
422 if (extraspace)
423 __ sub(sp, sp, extraspace);
424
425 // Now write the args into the outgoing interpreter space
426 for (int i = 0; i < total_args_passed; i++) {
427 if (sig_bt[i] == T_VOID) {
428 assert(i > 0 && (sig_bt[i-1] == T_LONG || sig_bt[i-1] == T_DOUBLE), "missing half");
429 continue;
430 }
431
432 // offset to start parameters
433 int st_off = (total_args_passed - i - 1) * Interpreter::stackElementSize;
434 int next_off = st_off - Interpreter::stackElementSize;
435
436 // Say 4 args:
437 // i st_off
438 // 0 32 T_LONG
439 // 1 24 T_VOID
440 // 2 16 T_OBJECT
441 // 3 8 T_BOOL
442 // - 0 return address
443 //
444 // However to make thing extra confusing. Because we can fit a Java long/double in
445 // a single slot on a 64 bt vm and it would be silly to break them up, the interpreter
446 // leaves one slot empty and only stores to a single slot. In this case the
447 // slot that is occupied is the T_VOID slot. See I said it was confusing.
448
449 VMReg r_1 = regs[i].first();
450 VMReg r_2 = regs[i].second();
451 if (!r_1->is_valid()) {
452 assert(!r_2->is_valid(), "");
453 continue;
454 }
455 if (r_1->is_stack()) {
456 // memory to memory use rscratch1
457 int ld_off = (r_1->reg2stack() * VMRegImpl::stack_slot_size
458 + extraspace
459 + words_pushed * wordSize);
460 if (!r_2->is_valid()) {
461 // sign extend??
462 __ ldrw(rscratch1, Address(sp, ld_off));
463 __ str(rscratch1, Address(sp, st_off));
464
465 } else {
466
467 __ ldr(rscratch1, Address(sp, ld_off));
468
469 // Two VMREgs|OptoRegs can be T_OBJECT, T_ADDRESS, T_DOUBLE, T_LONG
470 // T_DOUBLE and T_LONG use two slots in the interpreter
471 if ( sig_bt[i] == T_LONG || sig_bt[i] == T_DOUBLE) {
472 // ld_off == LSW, ld_off+wordSize == MSW
473 // st_off == MSW, next_off == LSW
474 __ str(rscratch1, Address(sp, next_off));
475 #ifdef ASSERT
476 // Overwrite the unused slot with known junk
477 __ mov(rscratch1, (uint64_t)0xdeadffffdeadaaaaull);
478 __ str(rscratch1, Address(sp, st_off));
479 #endif /* ASSERT */
480 } else {
481 __ str(rscratch1, Address(sp, st_off));
482 }
483 }
484 } else if (r_1->is_Register()) {
485 Register r = r_1->as_Register();
486 if (!r_2->is_valid()) {
487 // must be only an int (or less ) so move only 32bits to slot
488 // why not sign extend??
489 __ str(r, Address(sp, st_off));
490 } else {
491 // Two VMREgs|OptoRegs can be T_OBJECT, T_ADDRESS, T_DOUBLE, T_LONG
492 // T_DOUBLE and T_LONG use two slots in the interpreter
493 if ( sig_bt[i] == T_LONG || sig_bt[i] == T_DOUBLE) {
494 // jlong/double in gpr
495 #ifdef ASSERT
496 // Overwrite the unused slot with known junk
497 __ mov(rscratch1, (uint64_t)0xdeadffffdeadaaabull);
498 __ str(rscratch1, Address(sp, st_off));
499 #endif /* ASSERT */
500 __ str(r, Address(sp, next_off));
501 } else {
502 __ str(r, Address(sp, st_off));
503 }
504 }
505 } else {
506 assert(r_1->is_FloatRegister(), "");
507 if (!r_2->is_valid()) {
508 // only a float use just part of the slot
509 __ strs(r_1->as_FloatRegister(), Address(sp, st_off));
510 } else {
511 #ifdef ASSERT
512 // Overwrite the unused slot with known junk
513 __ mov(rscratch1, (uint64_t)0xdeadffffdeadaaacull);
514 __ str(rscratch1, Address(sp, st_off));
515 #endif /* ASSERT */
516 __ strd(r_1->as_FloatRegister(), Address(sp, next_off));
517 }
518 }
519 }
520
521 __ mov(esp, sp); // Interp expects args on caller's expression stack
522
523 __ ldr(rscratch1, Address(rmethod, in_bytes(Method::interpreter_entry_offset())));
524 __ br(rscratch1);
525 }
526
527
528 void SharedRuntime::gen_i2c_adapter(MacroAssembler *masm,
529 int total_args_passed,
530 int comp_args_on_stack,
531 const BasicType *sig_bt,
532 const VMRegPair *regs) {
533
534 // Note: r19_sender_sp contains the senderSP on entry. We must
535 // preserve it since we may do a i2c -> c2i transition if we lose a
536 // race where compiled code goes non-entrant while we get args
537 // ready.
538
539 // Adapters are frameless.
540
541 // An i2c adapter is frameless because the *caller* frame, which is
542 // interpreted, routinely repairs its own esp (from
543 // interpreter_frame_last_sp), even if a callee has modified the
544 // stack pointer. It also recalculates and aligns sp.
545
546 // A c2i adapter is frameless because the *callee* frame, which is
547 // interpreted, routinely repairs its caller's sp (from sender_sp,
548 // which is set up via the senderSP register).
549
550 // In other words, if *either* the caller or callee is interpreted, we can
551 // get the stack pointer repaired after a call.
552
553 // This is why c2i and i2c adapters cannot be indefinitely composed.
554 // In particular, if a c2i adapter were to somehow call an i2c adapter,
555 // both caller and callee would be compiled methods, and neither would
556 // clean up the stack pointer changes performed by the two adapters.
557 // If this happens, control eventually transfers back to the compiled
558 // caller, but with an uncorrected stack, causing delayed havoc.
559
560 // Cut-out for having no stack args.
561 int comp_words_on_stack = align_up(comp_args_on_stack*VMRegImpl::stack_slot_size, wordSize)>>LogBytesPerWord;
562 if (comp_args_on_stack) {
563 __ sub(rscratch1, sp, comp_words_on_stack * wordSize);
564 __ andr(sp, rscratch1, -16);
565 }
566
567 // Will jump to the compiled code just as if compiled code was doing it.
568 // Pre-load the register-jump target early, to schedule it better.
569 __ ldr(rscratch1, Address(rmethod, in_bytes(Method::from_compiled_offset())));
570
571 #if INCLUDE_JVMCI
572 if (EnableJVMCI) {
573 // check if this call should be routed towards a specific entry point
574 __ ldr(rscratch2, Address(rthread, in_bytes(JavaThread::jvmci_alternate_call_target_offset())));
575 Label no_alternative_target;
576 __ cbz(rscratch2, no_alternative_target);
577 __ mov(rscratch1, rscratch2);
578 __ str(zr, Address(rthread, in_bytes(JavaThread::jvmci_alternate_call_target_offset())));
579 __ bind(no_alternative_target);
580 }
581 #endif // INCLUDE_JVMCI
582
583 // Now generate the shuffle code.
584 for (int i = 0; i < total_args_passed; i++) {
585 if (sig_bt[i] == T_VOID) {
586 assert(i > 0 && (sig_bt[i-1] == T_LONG || sig_bt[i-1] == T_DOUBLE), "missing half");
587 continue;
588 }
589
590 // Pick up 0, 1 or 2 words from SP+offset.
591
592 assert(!regs[i].second()->is_valid() || regs[i].first()->next() == regs[i].second(),
593 "scrambled load targets?");
594 // Load in argument order going down.
595 int ld_off = (total_args_passed - i - 1)*Interpreter::stackElementSize;
596 // Point to interpreter value (vs. tag)
597 int next_off = ld_off - Interpreter::stackElementSize;
598 //
599 //
600 //
601 VMReg r_1 = regs[i].first();
602 VMReg r_2 = regs[i].second();
603 if (!r_1->is_valid()) {
604 assert(!r_2->is_valid(), "");
605 continue;
606 }
607 if (r_1->is_stack()) {
608 // Convert stack slot to an SP offset (+ wordSize to account for return address )
609 int st_off = regs[i].first()->reg2stack()*VMRegImpl::stack_slot_size;
610 if (!r_2->is_valid()) {
611 // sign extend???
612 __ ldrsw(rscratch2, Address(esp, ld_off));
613 __ str(rscratch2, Address(sp, st_off));
614 } else {
615 //
616 // We are using two optoregs. This can be either T_OBJECT,
617 // T_ADDRESS, T_LONG, or T_DOUBLE the interpreter allocates
618 // two slots but only uses one for thr T_LONG or T_DOUBLE case
619 // So we must adjust where to pick up the data to match the
620 // interpreter.
621 //
622 // Interpreter local[n] == MSW, local[n+1] == LSW however locals
623 // are accessed as negative so LSW is at LOW address
624
625 // ld_off is MSW so get LSW
626 const int offset = (sig_bt[i]==T_LONG||sig_bt[i]==T_DOUBLE)?
627 next_off : ld_off;
628 __ ldr(rscratch2, Address(esp, offset));
629 // st_off is LSW (i.e. reg.first())
630 __ str(rscratch2, Address(sp, st_off));
631 }
632 } else if (r_1->is_Register()) { // Register argument
633 Register r = r_1->as_Register();
634 if (r_2->is_valid()) {
635 //
636 // We are using two VMRegs. This can be either T_OBJECT,
637 // T_ADDRESS, T_LONG, or T_DOUBLE the interpreter allocates
638 // two slots but only uses one for thr T_LONG or T_DOUBLE case
639 // So we must adjust where to pick up the data to match the
640 // interpreter.
641
642 const int offset = (sig_bt[i]==T_LONG||sig_bt[i]==T_DOUBLE)?
643 next_off : ld_off;
644
645 // this can be a misaligned move
646 __ ldr(r, Address(esp, offset));
647 } else {
648 // sign extend and use a full word?
649 __ ldrw(r, Address(esp, ld_off));
650 }
651 } else {
652 if (!r_2->is_valid()) {
653 __ ldrs(r_1->as_FloatRegister(), Address(esp, ld_off));
654 } else {
655 __ ldrd(r_1->as_FloatRegister(), Address(esp, next_off));
656 }
657 }
658 }
659
660 __ mov(rscratch2, rscratch1);
661 __ push_cont_fastpath(rthread); // Set JavaThread::_cont_fastpath to the sp of the oldest interpreted frame we know about; kills rscratch1
662 __ mov(rscratch1, rscratch2);
663
664 // 6243940 We might end up in handle_wrong_method if
665 // the callee is deoptimized as we race thru here. If that
666 // happens we don't want to take a safepoint because the
667 // caller frame will look interpreted and arguments are now
668 // "compiled" so it is much better to make this transition
669 // invisible to the stack walking code. Unfortunately if
670 // we try and find the callee by normal means a safepoint
671 // is possible. So we stash the desired callee in the thread
672 // and the vm will find there should this case occur.
673
674 __ str(rmethod, Address(rthread, JavaThread::callee_target_offset()));
675
676 __ br(rscratch1);
677 }
678
679 // ---------------------------------------------------------------
680 void SharedRuntime::generate_i2c2i_adapters(MacroAssembler *masm,
681 int total_args_passed,
682 int comp_args_on_stack,
683 const BasicType *sig_bt,
684 const VMRegPair *regs,
685 AdapterHandlerEntry* handler) {
686 address i2c_entry = __ pc();
687
688 gen_i2c_adapter(masm, total_args_passed, comp_args_on_stack, sig_bt, regs);
689
690 address c2i_unverified_entry = __ pc();
691 Label skip_fixup;
692
693 Register data = rscratch2;
694 Register receiver = j_rarg0;
695 Register tmp = r10; // A call-clobbered register not used for arg passing
696
697 // -------------------------------------------------------------------------
698 // Generate a C2I adapter. On entry we know rmethod holds the Method* during calls
699 // to the interpreter. The args start out packed in the compiled layout. They
700 // need to be unpacked into the interpreter layout. This will almost always
701 // require some stack space. We grow the current (compiled) stack, then repack
702 // the args. We finally end in a jump to the generic interpreter entry point.
703 // On exit from the interpreter, the interpreter will restore our SP (lest the
704 // compiled code, which relies solely on SP and not FP, get sick).
705
706 {
707 __ block_comment("c2i_unverified_entry {");
708 // Method might have been compiled since the call site was patched to
709 // interpreted; if that is the case treat it as a miss so we can get
710 // the call site corrected.
711 __ ic_check(1 /* end_alignment */);
712 __ ldr(rmethod, Address(data, CompiledICData::speculated_method_offset()));
713
714 __ ldr(rscratch1, Address(rmethod, in_bytes(Method::code_offset())));
715 __ cbz(rscratch1, skip_fixup);
716 __ far_jump(RuntimeAddress(SharedRuntime::get_ic_miss_stub()));
717 __ block_comment("} c2i_unverified_entry");
718 }
719
720 address c2i_entry = __ pc();
721
722 // Class initialization barrier for static methods
723 address c2i_no_clinit_check_entry = nullptr;
724 if (VM_Version::supports_fast_class_init_checks()) {
725 Label L_skip_barrier;
726
727 { // Bypass the barrier for non-static methods
728 __ ldrh(rscratch1, Address(rmethod, Method::access_flags_offset()));
729 __ andsw(zr, rscratch1, JVM_ACC_STATIC);
730 __ br(Assembler::EQ, L_skip_barrier); // non-static
731 }
732
733 __ load_method_holder(rscratch2, rmethod);
734 __ clinit_barrier(rscratch2, rscratch1, &L_skip_barrier);
735 __ far_jump(RuntimeAddress(SharedRuntime::get_handle_wrong_method_stub()));
736
737 __ bind(L_skip_barrier);
738 c2i_no_clinit_check_entry = __ pc();
739 }
740
741 BarrierSetAssembler* bs = BarrierSet::barrier_set()->barrier_set_assembler();
742 bs->c2i_entry_barrier(masm);
743
744 gen_c2i_adapter(masm, total_args_passed, comp_args_on_stack, sig_bt, regs, skip_fixup);
745
746 handler->set_entry_points(i2c_entry, c2i_entry, c2i_unverified_entry, c2i_no_clinit_check_entry);
747 return;
748 }
749
750 static int c_calling_convention_priv(const BasicType *sig_bt,
751 VMRegPair *regs,
752 int total_args_passed) {
753
754 // We return the amount of VMRegImpl stack slots we need to reserve for all
755 // the arguments NOT counting out_preserve_stack_slots.
756
757 static const Register INT_ArgReg[Argument::n_int_register_parameters_c] = {
758 c_rarg0, c_rarg1, c_rarg2, c_rarg3, c_rarg4, c_rarg5, c_rarg6, c_rarg7
759 };
760 static const FloatRegister FP_ArgReg[Argument::n_float_register_parameters_c] = {
761 c_farg0, c_farg1, c_farg2, c_farg3,
762 c_farg4, c_farg5, c_farg6, c_farg7
763 };
764
765 uint int_args = 0;
766 uint fp_args = 0;
767 uint stk_args = 0; // inc by 2 each time
768
769 for (int i = 0; i < total_args_passed; i++) {
770 switch (sig_bt[i]) {
771 case T_BOOLEAN:
772 case T_CHAR:
773 case T_BYTE:
774 case T_SHORT:
775 case T_INT:
776 if (int_args < Argument::n_int_register_parameters_c) {
777 regs[i].set1(INT_ArgReg[int_args++]->as_VMReg());
778 } else {
779 #ifdef __APPLE__
780 // Less-than word types are stored one after another.
781 // The code is unable to handle this so bailout.
782 return -1;
783 #endif
784 regs[i].set1(VMRegImpl::stack2reg(stk_args));
785 stk_args += 2;
786 }
787 break;
788 case T_LONG:
789 assert((i + 1) < total_args_passed && sig_bt[i + 1] == T_VOID, "expecting half");
790 // fall through
791 case T_OBJECT:
792 case T_ARRAY:
793 case T_ADDRESS:
794 case T_METADATA:
795 if (int_args < Argument::n_int_register_parameters_c) {
796 regs[i].set2(INT_ArgReg[int_args++]->as_VMReg());
797 } else {
798 regs[i].set2(VMRegImpl::stack2reg(stk_args));
799 stk_args += 2;
800 }
801 break;
802 case T_FLOAT:
803 if (fp_args < Argument::n_float_register_parameters_c) {
804 regs[i].set1(FP_ArgReg[fp_args++]->as_VMReg());
805 } else {
806 #ifdef __APPLE__
807 // Less-than word types are stored one after another.
808 // The code is unable to handle this so bailout.
809 return -1;
810 #endif
811 regs[i].set1(VMRegImpl::stack2reg(stk_args));
812 stk_args += 2;
813 }
814 break;
815 case T_DOUBLE:
816 assert((i + 1) < total_args_passed && sig_bt[i + 1] == T_VOID, "expecting half");
817 if (fp_args < Argument::n_float_register_parameters_c) {
818 regs[i].set2(FP_ArgReg[fp_args++]->as_VMReg());
819 } else {
820 regs[i].set2(VMRegImpl::stack2reg(stk_args));
821 stk_args += 2;
822 }
823 break;
824 case T_VOID: // Halves of longs and doubles
825 assert(i != 0 && (sig_bt[i - 1] == T_LONG || sig_bt[i - 1] == T_DOUBLE), "expecting half");
826 regs[i].set_bad();
827 break;
828 default:
829 ShouldNotReachHere();
830 break;
831 }
832 }
833
834 return stk_args;
835 }
836
837 int SharedRuntime::vector_calling_convention(VMRegPair *regs,
838 uint num_bits,
839 uint total_args_passed) {
840 // More than 8 argument inputs are not supported now.
841 assert(total_args_passed <= Argument::n_float_register_parameters_c, "unsupported");
842 assert(num_bits >= 64 && num_bits <= 2048 && is_power_of_2(num_bits), "unsupported");
843
844 static const FloatRegister VEC_ArgReg[Argument::n_float_register_parameters_c] = {
845 v0, v1, v2, v3, v4, v5, v6, v7
846 };
847
848 // On SVE, we use the same vector registers with 128-bit vector registers on NEON.
849 int next_reg_val = num_bits == 64 ? 1 : 3;
850 for (uint i = 0; i < total_args_passed; i++) {
851 VMReg vmreg = VEC_ArgReg[i]->as_VMReg();
852 regs[i].set_pair(vmreg->next(next_reg_val), vmreg);
853 }
854 return 0;
855 }
856
857 int SharedRuntime::c_calling_convention(const BasicType *sig_bt,
858 VMRegPair *regs,
859 int total_args_passed)
860 {
861 int result = c_calling_convention_priv(sig_bt, regs, total_args_passed);
862 guarantee(result >= 0, "Unsupported arguments configuration");
863 return result;
864 }
865
866
867 void SharedRuntime::save_native_result(MacroAssembler *masm, BasicType ret_type, int frame_slots) {
868 // We always ignore the frame_slots arg and just use the space just below frame pointer
869 // which by this time is free to use
870 switch (ret_type) {
871 case T_FLOAT:
872 __ strs(v0, Address(rfp, -wordSize));
873 break;
874 case T_DOUBLE:
875 __ strd(v0, Address(rfp, -wordSize));
876 break;
877 case T_VOID: break;
878 default: {
879 __ str(r0, Address(rfp, -wordSize));
880 }
881 }
882 }
883
884 void SharedRuntime::restore_native_result(MacroAssembler *masm, BasicType ret_type, int frame_slots) {
885 // We always ignore the frame_slots arg and just use the space just below frame pointer
886 // which by this time is free to use
887 switch (ret_type) {
888 case T_FLOAT:
889 __ ldrs(v0, Address(rfp, -wordSize));
890 break;
891 case T_DOUBLE:
892 __ ldrd(v0, Address(rfp, -wordSize));
893 break;
894 case T_VOID: break;
895 default: {
896 __ ldr(r0, Address(rfp, -wordSize));
897 }
898 }
899 }
900 static void save_args(MacroAssembler *masm, int arg_count, int first_arg, VMRegPair *args) {
901 RegSet x;
902 for ( int i = first_arg ; i < arg_count ; i++ ) {
903 if (args[i].first()->is_Register()) {
904 x = x + args[i].first()->as_Register();
905 } else if (args[i].first()->is_FloatRegister()) {
906 __ strd(args[i].first()->as_FloatRegister(), Address(__ pre(sp, -2 * wordSize)));
907 }
908 }
909 __ push(x, sp);
910 }
911
912 static void restore_args(MacroAssembler *masm, int arg_count, int first_arg, VMRegPair *args) {
913 RegSet x;
914 for ( int i = first_arg ; i < arg_count ; i++ ) {
915 if (args[i].first()->is_Register()) {
916 x = x + args[i].first()->as_Register();
917 } else {
918 ;
919 }
920 }
921 __ pop(x, sp);
922 for ( int i = arg_count - 1 ; i >= first_arg ; i-- ) {
923 if (args[i].first()->is_Register()) {
924 ;
925 } else if (args[i].first()->is_FloatRegister()) {
926 __ ldrd(args[i].first()->as_FloatRegister(), Address(__ post(sp, 2 * wordSize)));
927 }
928 }
929 }
930
931 static void verify_oop_args(MacroAssembler* masm,
932 const methodHandle& method,
933 const BasicType* sig_bt,
934 const VMRegPair* regs) {
935 Register temp_reg = r19; // not part of any compiled calling seq
936 if (VerifyOops) {
937 for (int i = 0; i < method->size_of_parameters(); i++) {
938 if (sig_bt[i] == T_OBJECT ||
939 sig_bt[i] == T_ARRAY) {
940 VMReg r = regs[i].first();
941 assert(r->is_valid(), "bad oop arg");
942 if (r->is_stack()) {
943 __ ldr(temp_reg, Address(sp, r->reg2stack() * VMRegImpl::stack_slot_size));
944 __ verify_oop(temp_reg);
945 } else {
946 __ verify_oop(r->as_Register());
947 }
948 }
949 }
950 }
951 }
952
953 // on exit, sp points to the ContinuationEntry
954 static OopMap* continuation_enter_setup(MacroAssembler* masm, int& stack_slots) {
955 assert(ContinuationEntry::size() % VMRegImpl::stack_slot_size == 0, "");
956 assert(in_bytes(ContinuationEntry::cont_offset()) % VMRegImpl::stack_slot_size == 0, "");
957 assert(in_bytes(ContinuationEntry::chunk_offset()) % VMRegImpl::stack_slot_size == 0, "");
958
959 stack_slots += (int)ContinuationEntry::size()/wordSize;
960 __ sub(sp, sp, (int)ContinuationEntry::size()); // place Continuation metadata
961
962 OopMap* map = new OopMap(((int)ContinuationEntry::size() + wordSize)/ VMRegImpl::stack_slot_size, 0 /* arg_slots*/);
963
964 __ ldr(rscratch1, Address(rthread, JavaThread::cont_entry_offset()));
965 __ str(rscratch1, Address(sp, ContinuationEntry::parent_offset()));
966 __ mov(rscratch1, sp); // we can't use sp as the source in str
967 __ str(rscratch1, Address(rthread, JavaThread::cont_entry_offset()));
968
969 return map;
970 }
971
972 // on entry c_rarg1 points to the continuation
973 // sp points to ContinuationEntry
974 // c_rarg3 -- isVirtualThread
975 static void fill_continuation_entry(MacroAssembler* masm) {
976 #ifdef ASSERT
977 __ movw(rscratch1, ContinuationEntry::cookie_value());
978 __ strw(rscratch1, Address(sp, ContinuationEntry::cookie_offset()));
979 #endif
980
981 __ str (c_rarg1, Address(sp, ContinuationEntry::cont_offset()));
982 __ strw(c_rarg3, Address(sp, ContinuationEntry::flags_offset()));
983 __ str (zr, Address(sp, ContinuationEntry::chunk_offset()));
984 __ strw(zr, Address(sp, ContinuationEntry::argsize_offset()));
985 __ strw(zr, Address(sp, ContinuationEntry::pin_count_offset()));
986
987 __ ldr(rscratch1, Address(rthread, JavaThread::cont_fastpath_offset()));
988 __ str(rscratch1, Address(sp, ContinuationEntry::parent_cont_fastpath_offset()));
989 __ ldr(rscratch1, Address(rthread, JavaThread::held_monitor_count_offset()));
990 __ str(rscratch1, Address(sp, ContinuationEntry::parent_held_monitor_count_offset()));
991
992 __ str(zr, Address(rthread, JavaThread::cont_fastpath_offset()));
993 __ str(zr, Address(rthread, JavaThread::held_monitor_count_offset()));
994 }
995
996 // on entry, sp points to the ContinuationEntry
997 // on exit, rfp points to the spilled rfp in the entry frame
998 static void continuation_enter_cleanup(MacroAssembler* masm) {
999 #ifndef PRODUCT
1000 Label OK;
1001 __ ldr(rscratch1, Address(rthread, JavaThread::cont_entry_offset()));
1002 __ cmp(sp, rscratch1);
1003 __ br(Assembler::EQ, OK);
1004 __ stop("incorrect sp1");
1005 __ bind(OK);
1006 #endif
1007 __ ldr(rscratch1, Address(sp, ContinuationEntry::parent_cont_fastpath_offset()));
1008 __ str(rscratch1, Address(rthread, JavaThread::cont_fastpath_offset()));
1009
1010 if (CheckJNICalls) {
1011 // Check if this is a virtual thread continuation
1012 Label L_skip_vthread_code;
1013 __ ldrw(rscratch1, Address(sp, ContinuationEntry::flags_offset()));
1014 __ cbzw(rscratch1, L_skip_vthread_code);
1015
1016 // If the held monitor count is > 0 and this vthread is terminating then
1017 // it failed to release a JNI monitor. So we issue the same log message
1018 // that JavaThread::exit does.
1019 __ ldr(rscratch1, Address(rthread, JavaThread::jni_monitor_count_offset()));
1020 __ cbz(rscratch1, L_skip_vthread_code);
1021
1022 // Save return value potentially containing the exception oop in callee-saved R19.
1023 __ mov(r19, r0);
1024 __ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::log_jni_monitor_still_held));
1025 // Restore potential return value.
1026 __ mov(r0, r19);
1027
1028 // For vthreads we have to explicitly zero the JNI monitor count of the carrier
1029 // on termination. The held count is implicitly zeroed below when we restore from
1030 // the parent held count (which has to be zero).
1031 __ str(zr, Address(rthread, JavaThread::jni_monitor_count_offset()));
1032
1033 __ bind(L_skip_vthread_code);
1034 }
1035 #ifdef ASSERT
1036 else {
1037 // Check if this is a virtual thread continuation
1038 Label L_skip_vthread_code;
1039 __ ldrw(rscratch1, Address(sp, ContinuationEntry::flags_offset()));
1040 __ cbzw(rscratch1, L_skip_vthread_code);
1041
1042 // See comment just above. If not checking JNI calls the JNI count is only
1043 // needed for assertion checking.
1044 __ str(zr, Address(rthread, JavaThread::jni_monitor_count_offset()));
1045
1046 __ bind(L_skip_vthread_code);
1047 }
1048 #endif
1049
1050 __ ldr(rscratch1, Address(sp, ContinuationEntry::parent_held_monitor_count_offset()));
1051 __ str(rscratch1, Address(rthread, JavaThread::held_monitor_count_offset()));
1052
1053 __ ldr(rscratch2, Address(sp, ContinuationEntry::parent_offset()));
1054 __ str(rscratch2, Address(rthread, JavaThread::cont_entry_offset()));
1055 __ add(rfp, sp, (int)ContinuationEntry::size());
1056 }
1057
1058 // enterSpecial(Continuation c, boolean isContinue, boolean isVirtualThread)
1059 // On entry: c_rarg1 -- the continuation object
1060 // c_rarg2 -- isContinue
1061 // c_rarg3 -- isVirtualThread
1062 static void gen_continuation_enter(MacroAssembler* masm,
1063 const methodHandle& method,
1064 const BasicType* sig_bt,
1065 const VMRegPair* regs,
1066 int& exception_offset,
1067 OopMapSet*oop_maps,
1068 int& frame_complete,
1069 int& stack_slots,
1070 int& interpreted_entry_offset,
1071 int& compiled_entry_offset) {
1072 //verify_oop_args(masm, method, sig_bt, regs);
1073 Address resolve(SharedRuntime::get_resolve_static_call_stub(), relocInfo::static_call_type);
1074
1075 address start = __ pc();
1076
1077 Label call_thaw, exit;
1078
1079 // i2i entry used at interp_only_mode only
1080 interpreted_entry_offset = __ pc() - start;
1081 {
1082
1083 #ifdef ASSERT
1084 Label is_interp_only;
1085 __ ldrw(rscratch1, Address(rthread, JavaThread::interp_only_mode_offset()));
1086 __ cbnzw(rscratch1, is_interp_only);
1087 __ stop("enterSpecial interpreter entry called when not in interp_only_mode");
1088 __ bind(is_interp_only);
1089 #endif
1090
1091 // Read interpreter arguments into registers (this is an ad-hoc i2c adapter)
1092 __ ldr(c_rarg1, Address(esp, Interpreter::stackElementSize*2));
1093 __ ldr(c_rarg2, Address(esp, Interpreter::stackElementSize*1));
1094 __ ldr(c_rarg3, Address(esp, Interpreter::stackElementSize*0));
1095 __ push_cont_fastpath(rthread);
1096
1097 __ enter();
1098 stack_slots = 2; // will be adjusted in setup
1099 OopMap* map = continuation_enter_setup(masm, stack_slots);
1100 // The frame is complete here, but we only record it for the compiled entry, so the frame would appear unsafe,
1101 // but that's okay because at the very worst we'll miss an async sample, but we're in interp_only_mode anyway.
1102
1103 fill_continuation_entry(masm);
1104
1105 __ cbnz(c_rarg2, call_thaw);
1106
1107 const address tr_call = __ trampoline_call(resolve);
1108 if (tr_call == nullptr) {
1109 fatal("CodeCache is full at gen_continuation_enter");
1110 }
1111
1112 oop_maps->add_gc_map(__ pc() - start, map);
1113 __ post_call_nop();
1114
1115 __ b(exit);
1116
1117 address stub = CompiledDirectCall::emit_to_interp_stub(masm, tr_call);
1118 if (stub == nullptr) {
1119 fatal("CodeCache is full at gen_continuation_enter");
1120 }
1121 }
1122
1123 // compiled entry
1124 __ align(CodeEntryAlignment);
1125 compiled_entry_offset = __ pc() - start;
1126
1127 __ enter();
1128 stack_slots = 2; // will be adjusted in setup
1129 OopMap* map = continuation_enter_setup(masm, stack_slots);
1130 frame_complete = __ pc() - start;
1131
1132 fill_continuation_entry(masm);
1133
1134 __ cbnz(c_rarg2, call_thaw);
1135
1136 const address tr_call = __ trampoline_call(resolve);
1137 if (tr_call == nullptr) {
1138 fatal("CodeCache is full at gen_continuation_enter");
1139 }
1140
1141 oop_maps->add_gc_map(__ pc() - start, map);
1142 __ post_call_nop();
1143
1144 __ b(exit);
1145
1146 __ bind(call_thaw);
1147
1148 ContinuationEntry::_thaw_call_pc_offset = __ pc() - start;
1149 __ rt_call(CAST_FROM_FN_PTR(address, StubRoutines::cont_thaw()));
1150 oop_maps->add_gc_map(__ pc() - start, map->deep_copy());
1151 ContinuationEntry::_return_pc_offset = __ pc() - start;
1152 __ post_call_nop();
1153
1154 __ bind(exit);
1155 ContinuationEntry::_cleanup_offset = __ pc() - start;
1156 continuation_enter_cleanup(masm);
1157 __ leave();
1158 __ ret(lr);
1159
1160 /// exception handling
1161
1162 exception_offset = __ pc() - start;
1163 {
1164 __ mov(r19, r0); // save return value contaning the exception oop in callee-saved R19
1165
1166 continuation_enter_cleanup(masm);
1167
1168 __ ldr(c_rarg1, Address(rfp, wordSize)); // return address
1169 __ authenticate_return_address(c_rarg1);
1170 __ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::exception_handler_for_return_address), rthread, c_rarg1);
1171
1172 // see OptoRuntime::generate_exception_blob: r0 -- exception oop, r3 -- exception pc
1173
1174 __ mov(r1, r0); // the exception handler
1175 __ mov(r0, r19); // restore return value contaning the exception oop
1176 __ verify_oop(r0);
1177
1178 __ leave();
1179 __ mov(r3, lr);
1180 __ br(r1); // the exception handler
1181 }
1182
1183 address stub = CompiledDirectCall::emit_to_interp_stub(masm, tr_call);
1184 if (stub == nullptr) {
1185 fatal("CodeCache is full at gen_continuation_enter");
1186 }
1187 }
1188
1189 static void gen_continuation_yield(MacroAssembler* masm,
1190 const methodHandle& method,
1191 const BasicType* sig_bt,
1192 const VMRegPair* regs,
1193 OopMapSet* oop_maps,
1194 int& frame_complete,
1195 int& stack_slots,
1196 int& compiled_entry_offset) {
1197 enum layout {
1198 rfp_off1,
1199 rfp_off2,
1200 lr_off,
1201 lr_off2,
1202 framesize // inclusive of return address
1203 };
1204 // assert(is_even(framesize/2), "sp not 16-byte aligned");
1205 stack_slots = framesize / VMRegImpl::slots_per_word;
1206 assert(stack_slots == 2, "recheck layout");
1207
1208 address start = __ pc();
1209
1210 compiled_entry_offset = __ pc() - start;
1211 __ enter();
1212
1213 __ mov(c_rarg1, sp);
1214
1215 frame_complete = __ pc() - start;
1216 address the_pc = __ pc();
1217
1218 __ post_call_nop(); // this must be exactly after the pc value that is pushed into the frame info, we use this nop for fast CodeBlob lookup
1219
1220 __ mov(c_rarg0, rthread);
1221 __ set_last_Java_frame(sp, rfp, the_pc, rscratch1);
1222 __ call_VM_leaf(Continuation::freeze_entry(), 2);
1223 __ reset_last_Java_frame(true);
1224
1225 Label pinned;
1226
1227 __ cbnz(r0, pinned);
1228
1229 // We've succeeded, set sp to the ContinuationEntry
1230 __ ldr(rscratch1, Address(rthread, JavaThread::cont_entry_offset()));
1231 __ mov(sp, rscratch1);
1232 continuation_enter_cleanup(masm);
1233
1234 __ bind(pinned); // pinned -- return to caller
1235
1236 // handle pending exception thrown by freeze
1237 __ ldr(rscratch1, Address(rthread, in_bytes(Thread::pending_exception_offset())));
1238 Label ok;
1239 __ cbz(rscratch1, ok);
1240 __ leave();
1241 __ lea(rscratch1, RuntimeAddress(StubRoutines::forward_exception_entry()));
1242 __ br(rscratch1);
1243 __ bind(ok);
1244
1245 __ leave();
1246 __ ret(lr);
1247
1248 OopMap* map = new OopMap(framesize, 1);
1249 oop_maps->add_gc_map(the_pc - start, map);
1250 }
1251
1252 void SharedRuntime::continuation_enter_cleanup(MacroAssembler* masm) {
1253 ::continuation_enter_cleanup(masm);
1254 }
1255
1256 static void gen_special_dispatch(MacroAssembler* masm,
1257 const methodHandle& method,
1258 const BasicType* sig_bt,
1259 const VMRegPair* regs) {
1260 verify_oop_args(masm, method, sig_bt, regs);
1261 vmIntrinsics::ID iid = method->intrinsic_id();
1262
1263 // Now write the args into the outgoing interpreter space
1264 bool has_receiver = false;
1265 Register receiver_reg = noreg;
1266 int member_arg_pos = -1;
1267 Register member_reg = noreg;
1268 int ref_kind = MethodHandles::signature_polymorphic_intrinsic_ref_kind(iid);
1269 if (ref_kind != 0) {
1270 member_arg_pos = method->size_of_parameters() - 1; // trailing MemberName argument
1271 member_reg = r19; // known to be free at this point
1272 has_receiver = MethodHandles::ref_kind_has_receiver(ref_kind);
1273 } else if (iid == vmIntrinsics::_invokeBasic) {
1274 has_receiver = true;
1275 } else if (iid == vmIntrinsics::_linkToNative) {
1276 member_arg_pos = method->size_of_parameters() - 1; // trailing NativeEntryPoint argument
1277 member_reg = r19; // known to be free at this point
1278 } else {
1279 fatal("unexpected intrinsic id %d", vmIntrinsics::as_int(iid));
1280 }
1281
1282 if (member_reg != noreg) {
1283 // Load the member_arg into register, if necessary.
1284 SharedRuntime::check_member_name_argument_is_last_argument(method, sig_bt, regs);
1285 VMReg r = regs[member_arg_pos].first();
1286 if (r->is_stack()) {
1287 __ ldr(member_reg, Address(sp, r->reg2stack() * VMRegImpl::stack_slot_size));
1288 } else {
1289 // no data motion is needed
1290 member_reg = r->as_Register();
1291 }
1292 }
1293
1294 if (has_receiver) {
1295 // Make sure the receiver is loaded into a register.
1296 assert(method->size_of_parameters() > 0, "oob");
1297 assert(sig_bt[0] == T_OBJECT, "receiver argument must be an object");
1298 VMReg r = regs[0].first();
1299 assert(r->is_valid(), "bad receiver arg");
1300 if (r->is_stack()) {
1301 // Porting note: This assumes that compiled calling conventions always
1302 // pass the receiver oop in a register. If this is not true on some
1303 // platform, pick a temp and load the receiver from stack.
1304 fatal("receiver always in a register");
1305 receiver_reg = r2; // known to be free at this point
1306 __ ldr(receiver_reg, Address(sp, r->reg2stack() * VMRegImpl::stack_slot_size));
1307 } else {
1308 // no data motion is needed
1309 receiver_reg = r->as_Register();
1310 }
1311 }
1312
1313 // Figure out which address we are really jumping to:
1314 MethodHandles::generate_method_handle_dispatch(masm, iid,
1315 receiver_reg, member_reg, /*for_compiler_entry:*/ true);
1316 }
1317
1318 // ---------------------------------------------------------------------------
1319 // Generate a native wrapper for a given method. The method takes arguments
1320 // in the Java compiled code convention, marshals them to the native
1321 // convention (handlizes oops, etc), transitions to native, makes the call,
1322 // returns to java state (possibly blocking), unhandlizes any result and
1323 // returns.
1324 //
1325 // Critical native functions are a shorthand for the use of
1326 // GetPrimtiveArrayCritical and disallow the use of any other JNI
1327 // functions. The wrapper is expected to unpack the arguments before
1328 // passing them to the callee. Critical native functions leave the state _in_Java,
1329 // since they block out GC.
1330 // Some other parts of JNI setup are skipped like the tear down of the JNI handle
1331 // block and the check for pending exceptions it's impossible for them
1332 // to be thrown.
1333 //
1334 nmethod* SharedRuntime::generate_native_wrapper(MacroAssembler* masm,
1335 const methodHandle& method,
1336 int compile_id,
1337 BasicType* in_sig_bt,
1338 VMRegPair* in_regs,
1339 BasicType ret_type) {
1340 if (method->is_continuation_native_intrinsic()) {
1341 int exception_offset = -1;
1342 OopMapSet* oop_maps = new OopMapSet();
1343 int frame_complete = -1;
1344 int stack_slots = -1;
1345 int interpreted_entry_offset = -1;
1346 int vep_offset = -1;
1347 if (method->is_continuation_enter_intrinsic()) {
1348 gen_continuation_enter(masm,
1349 method,
1350 in_sig_bt,
1351 in_regs,
1352 exception_offset,
1353 oop_maps,
1354 frame_complete,
1355 stack_slots,
1356 interpreted_entry_offset,
1357 vep_offset);
1358 } else if (method->is_continuation_yield_intrinsic()) {
1359 gen_continuation_yield(masm,
1360 method,
1361 in_sig_bt,
1362 in_regs,
1363 oop_maps,
1364 frame_complete,
1365 stack_slots,
1366 vep_offset);
1367 } else {
1368 guarantee(false, "Unknown Continuation native intrinsic");
1369 }
1370
1371 #ifdef ASSERT
1372 if (method->is_continuation_enter_intrinsic()) {
1373 assert(interpreted_entry_offset != -1, "Must be set");
1374 assert(exception_offset != -1, "Must be set");
1375 } else {
1376 assert(interpreted_entry_offset == -1, "Must be unset");
1377 assert(exception_offset == -1, "Must be unset");
1378 }
1379 assert(frame_complete != -1, "Must be set");
1380 assert(stack_slots != -1, "Must be set");
1381 assert(vep_offset != -1, "Must be set");
1382 #endif
1383
1384 __ flush();
1385 nmethod* nm = nmethod::new_native_nmethod(method,
1386 compile_id,
1387 masm->code(),
1388 vep_offset,
1389 frame_complete,
1390 stack_slots,
1391 in_ByteSize(-1),
1392 in_ByteSize(-1),
1393 oop_maps,
1394 exception_offset);
1395 if (nm == nullptr) return nm;
1396 if (method->is_continuation_enter_intrinsic()) {
1397 ContinuationEntry::set_enter_code(nm, interpreted_entry_offset);
1398 } else if (method->is_continuation_yield_intrinsic()) {
1399 _cont_doYield_stub = nm;
1400 } else {
1401 guarantee(false, "Unknown Continuation native intrinsic");
1402 }
1403 return nm;
1404 }
1405
1406 if (method->is_method_handle_intrinsic()) {
1407 vmIntrinsics::ID iid = method->intrinsic_id();
1408 intptr_t start = (intptr_t)__ pc();
1409 int vep_offset = ((intptr_t)__ pc()) - start;
1410
1411 // First instruction must be a nop as it may need to be patched on deoptimisation
1412 __ nop();
1413 gen_special_dispatch(masm,
1414 method,
1415 in_sig_bt,
1416 in_regs);
1417 int frame_complete = ((intptr_t)__ pc()) - start; // not complete, period
1418 __ flush();
1419 int stack_slots = SharedRuntime::out_preserve_stack_slots(); // no out slots at all, actually
1420 return nmethod::new_native_nmethod(method,
1421 compile_id,
1422 masm->code(),
1423 vep_offset,
1424 frame_complete,
1425 stack_slots / VMRegImpl::slots_per_word,
1426 in_ByteSize(-1),
1427 in_ByteSize(-1),
1428 nullptr);
1429 }
1430 address native_func = method->native_function();
1431 assert(native_func != nullptr, "must have function");
1432
1433 // An OopMap for lock (and class if static)
1434 OopMapSet *oop_maps = new OopMapSet();
1435 intptr_t start = (intptr_t)__ pc();
1436
1437 // We have received a description of where all the java arg are located
1438 // on entry to the wrapper. We need to convert these args to where
1439 // the jni function will expect them. To figure out where they go
1440 // we convert the java signature to a C signature by inserting
1441 // the hidden arguments as arg[0] and possibly arg[1] (static method)
1442
1443 const int total_in_args = method->size_of_parameters();
1444 int total_c_args = total_in_args + (method->is_static() ? 2 : 1);
1445
1446 BasicType* out_sig_bt = NEW_RESOURCE_ARRAY(BasicType, total_c_args);
1447 VMRegPair* out_regs = NEW_RESOURCE_ARRAY(VMRegPair, total_c_args);
1448
1449 int argc = 0;
1450 out_sig_bt[argc++] = T_ADDRESS;
1451 if (method->is_static()) {
1452 out_sig_bt[argc++] = T_OBJECT;
1453 }
1454
1455 for (int i = 0; i < total_in_args ; i++ ) {
1456 out_sig_bt[argc++] = in_sig_bt[i];
1457 }
1458
1459 // Now figure out where the args must be stored and how much stack space
1460 // they require.
1461 int out_arg_slots;
1462 out_arg_slots = c_calling_convention_priv(out_sig_bt, out_regs, total_c_args);
1463
1464 if (out_arg_slots < 0) {
1465 return nullptr;
1466 }
1467
1468 // Compute framesize for the wrapper. We need to handlize all oops in
1469 // incoming registers
1470
1471 // Calculate the total number of stack slots we will need.
1472
1473 // First count the abi requirement plus all of the outgoing args
1474 int stack_slots = SharedRuntime::out_preserve_stack_slots() + out_arg_slots;
1475
1476 // Now the space for the inbound oop handle area
1477 int total_save_slots = 8 * VMRegImpl::slots_per_word; // 8 arguments passed in registers
1478
1479 int oop_handle_offset = stack_slots;
1480 stack_slots += total_save_slots;
1481
1482 // Now any space we need for handlizing a klass if static method
1483
1484 int klass_slot_offset = 0;
1485 int klass_offset = -1;
1486 int lock_slot_offset = 0;
1487 bool is_static = false;
1488
1489 if (method->is_static()) {
1490 klass_slot_offset = stack_slots;
1491 stack_slots += VMRegImpl::slots_per_word;
1492 klass_offset = klass_slot_offset * VMRegImpl::stack_slot_size;
1493 is_static = true;
1494 }
1495
1496 // Plus a lock if needed
1497
1498 if (method->is_synchronized()) {
1499 lock_slot_offset = stack_slots;
1500 stack_slots += VMRegImpl::slots_per_word;
1501 }
1502
1503 // Now a place (+2) to save return values or temp during shuffling
1504 // + 4 for return address (which we own) and saved rfp
1505 stack_slots += 6;
1506
1507 // Ok The space we have allocated will look like:
1508 //
1509 //
1510 // FP-> | |
1511 // |---------------------|
1512 // | 2 slots for moves |
1513 // |---------------------|
1514 // | lock box (if sync) |
1515 // |---------------------| <- lock_slot_offset
1516 // | klass (if static) |
1517 // |---------------------| <- klass_slot_offset
1518 // | oopHandle area |
1519 // |---------------------| <- oop_handle_offset (8 java arg registers)
1520 // | outbound memory |
1521 // | based arguments |
1522 // | |
1523 // |---------------------|
1524 // | |
1525 // SP-> | out_preserved_slots |
1526 //
1527 //
1528
1529
1530 // Now compute actual number of stack words we need rounding to make
1531 // stack properly aligned.
1532 stack_slots = align_up(stack_slots, StackAlignmentInSlots);
1533
1534 int stack_size = stack_slots * VMRegImpl::stack_slot_size;
1535
1536 // First thing make an ic check to see if we should even be here
1537
1538 // We are free to use all registers as temps without saving them and
1539 // restoring them except rfp. rfp is the only callee save register
1540 // as far as the interpreter and the compiler(s) are concerned.
1541
1542 const Register receiver = j_rarg0;
1543
1544 Label exception_pending;
1545
1546 assert_different_registers(receiver, rscratch1);
1547 __ verify_oop(receiver);
1548 __ ic_check(8 /* end_alignment */);
1549
1550 // Verified entry point must be aligned
1551 int vep_offset = ((intptr_t)__ pc()) - start;
1552
1553 // If we have to make this method not-entrant we'll overwrite its
1554 // first instruction with a jump. For this action to be legal we
1555 // must ensure that this first instruction is a B, BL, NOP, BKPT,
1556 // SVC, HVC, or SMC. Make it a NOP.
1557 __ nop();
1558
1559 if (VM_Version::supports_fast_class_init_checks() && method->needs_clinit_barrier()) {
1560 Label L_skip_barrier;
1561 __ mov_metadata(rscratch2, method->method_holder()); // InstanceKlass*
1562 __ clinit_barrier(rscratch2, rscratch1, &L_skip_barrier);
1563 __ far_jump(RuntimeAddress(SharedRuntime::get_handle_wrong_method_stub()));
1564
1565 __ bind(L_skip_barrier);
1566 }
1567
1568 // Generate stack overflow check
1569 __ bang_stack_with_offset(checked_cast<int>(StackOverflow::stack_shadow_zone_size()));
1570
1571 // Generate a new frame for the wrapper.
1572 __ enter();
1573 // -2 because return address is already present and so is saved rfp
1574 __ sub(sp, sp, stack_size - 2*wordSize);
1575
1576 BarrierSetAssembler* bs = BarrierSet::barrier_set()->barrier_set_assembler();
1577 bs->nmethod_entry_barrier(masm, nullptr /* slow_path */, nullptr /* continuation */, nullptr /* guard */);
1578
1579 // Frame is now completed as far as size and linkage.
1580 int frame_complete = ((intptr_t)__ pc()) - start;
1581
1582 // We use r20 as the oop handle for the receiver/klass
1583 // It is callee save so it survives the call to native
1584
1585 const Register oop_handle_reg = r20;
1586
1587 //
1588 // We immediately shuffle the arguments so that any vm call we have to
1589 // make from here on out (sync slow path, jvmti, etc.) we will have
1590 // captured the oops from our caller and have a valid oopMap for
1591 // them.
1592
1593 // -----------------
1594 // The Grand Shuffle
1595
1596 // The Java calling convention is either equal (linux) or denser (win64) than the
1597 // c calling convention. However the because of the jni_env argument the c calling
1598 // convention always has at least one more (and two for static) arguments than Java.
1599 // Therefore if we move the args from java -> c backwards then we will never have
1600 // a register->register conflict and we don't have to build a dependency graph
1601 // and figure out how to break any cycles.
1602 //
1603
1604 // Record esp-based slot for receiver on stack for non-static methods
1605 int receiver_offset = -1;
1606
1607 // This is a trick. We double the stack slots so we can claim
1608 // the oops in the caller's frame. Since we are sure to have
1609 // more args than the caller doubling is enough to make
1610 // sure we can capture all the incoming oop args from the
1611 // caller.
1612 //
1613 OopMap* map = new OopMap(stack_slots * 2, 0 /* arg_slots*/);
1614
1615 // Mark location of rfp (someday)
1616 // map->set_callee_saved(VMRegImpl::stack2reg( stack_slots - 2), stack_slots * 2, 0, vmreg(rfp));
1617
1618
1619 int float_args = 0;
1620 int int_args = 0;
1621
1622 #ifdef ASSERT
1623 bool reg_destroyed[Register::number_of_registers];
1624 bool freg_destroyed[FloatRegister::number_of_registers];
1625 for ( int r = 0 ; r < Register::number_of_registers ; r++ ) {
1626 reg_destroyed[r] = false;
1627 }
1628 for ( int f = 0 ; f < FloatRegister::number_of_registers ; f++ ) {
1629 freg_destroyed[f] = false;
1630 }
1631
1632 #endif /* ASSERT */
1633
1634 // For JNI natives the incoming and outgoing registers are offset upwards.
1635 GrowableArray<int> arg_order(2 * total_in_args);
1636
1637 for (int i = total_in_args - 1, c_arg = total_c_args - 1; i >= 0; i--, c_arg--) {
1638 arg_order.push(i);
1639 arg_order.push(c_arg);
1640 }
1641
1642 for (int ai = 0; ai < arg_order.length(); ai += 2) {
1643 int i = arg_order.at(ai);
1644 int c_arg = arg_order.at(ai + 1);
1645 __ block_comment(err_msg("move %d -> %d", i, c_arg));
1646 assert(c_arg != -1 && i != -1, "wrong order");
1647 #ifdef ASSERT
1648 if (in_regs[i].first()->is_Register()) {
1649 assert(!reg_destroyed[in_regs[i].first()->as_Register()->encoding()], "destroyed reg!");
1650 } else if (in_regs[i].first()->is_FloatRegister()) {
1651 assert(!freg_destroyed[in_regs[i].first()->as_FloatRegister()->encoding()], "destroyed reg!");
1652 }
1653 if (out_regs[c_arg].first()->is_Register()) {
1654 reg_destroyed[out_regs[c_arg].first()->as_Register()->encoding()] = true;
1655 } else if (out_regs[c_arg].first()->is_FloatRegister()) {
1656 freg_destroyed[out_regs[c_arg].first()->as_FloatRegister()->encoding()] = true;
1657 }
1658 #endif /* ASSERT */
1659 switch (in_sig_bt[i]) {
1660 case T_ARRAY:
1661 case T_OBJECT:
1662 __ object_move(map, oop_handle_offset, stack_slots, in_regs[i], out_regs[c_arg],
1663 ((i == 0) && (!is_static)),
1664 &receiver_offset);
1665 int_args++;
1666 break;
1667 case T_VOID:
1668 break;
1669
1670 case T_FLOAT:
1671 __ float_move(in_regs[i], out_regs[c_arg]);
1672 float_args++;
1673 break;
1674
1675 case T_DOUBLE:
1676 assert( i + 1 < total_in_args &&
1677 in_sig_bt[i + 1] == T_VOID &&
1678 out_sig_bt[c_arg+1] == T_VOID, "bad arg list");
1679 __ double_move(in_regs[i], out_regs[c_arg]);
1680 float_args++;
1681 break;
1682
1683 case T_LONG :
1684 __ long_move(in_regs[i], out_regs[c_arg]);
1685 int_args++;
1686 break;
1687
1688 case T_ADDRESS: assert(false, "found T_ADDRESS in java args");
1689
1690 default:
1691 __ move32_64(in_regs[i], out_regs[c_arg]);
1692 int_args++;
1693 }
1694 }
1695
1696 // point c_arg at the first arg that is already loaded in case we
1697 // need to spill before we call out
1698 int c_arg = total_c_args - total_in_args;
1699
1700 // Pre-load a static method's oop into c_rarg1.
1701 if (method->is_static()) {
1702
1703 // load oop into a register
1704 __ movoop(c_rarg1,
1705 JNIHandles::make_local(method->method_holder()->java_mirror()));
1706
1707 // Now handlize the static class mirror it's known not-null.
1708 __ str(c_rarg1, Address(sp, klass_offset));
1709 map->set_oop(VMRegImpl::stack2reg(klass_slot_offset));
1710
1711 // Now get the handle
1712 __ lea(c_rarg1, Address(sp, klass_offset));
1713 // and protect the arg if we must spill
1714 c_arg--;
1715 }
1716
1717 // Change state to native (we save the return address in the thread, since it might not
1718 // be pushed on the stack when we do a stack traversal). It is enough that the pc()
1719 // points into the right code segment. It does not have to be the correct return pc.
1720 // We use the same pc/oopMap repeatedly when we call out.
1721
1722 Label native_return;
1723 if (LockingMode != LM_LEGACY && method->is_object_wait0()) {
1724 // For convenience we use the pc we want to resume to in case of preemption on Object.wait.
1725 __ set_last_Java_frame(sp, noreg, native_return, rscratch1);
1726 } else {
1727 intptr_t the_pc = (intptr_t) __ pc();
1728 oop_maps->add_gc_map(the_pc - start, map);
1729
1730 __ set_last_Java_frame(sp, noreg, __ pc(), rscratch1);
1731 }
1732
1733 Label dtrace_method_entry, dtrace_method_entry_done;
1734 if (DTraceMethodProbes) {
1735 __ b(dtrace_method_entry);
1736 __ bind(dtrace_method_entry_done);
1737 }
1738
1739 // RedefineClasses() tracing support for obsolete method entry
1740 if (log_is_enabled(Trace, redefine, class, obsolete)) {
1741 // protect the args we've loaded
1742 save_args(masm, total_c_args, c_arg, out_regs);
1743 __ mov_metadata(c_rarg1, method());
1744 __ call_VM_leaf(
1745 CAST_FROM_FN_PTR(address, SharedRuntime::rc_trace_method_entry),
1746 rthread, c_rarg1);
1747 restore_args(masm, total_c_args, c_arg, out_regs);
1748 }
1749
1750 // Lock a synchronized method
1751
1752 // Register definitions used by locking and unlocking
1753
1754 const Register swap_reg = r0;
1755 const Register obj_reg = r19; // Will contain the oop
1756 const Register lock_reg = r13; // Address of compiler lock object (BasicLock)
1757 const Register old_hdr = r13; // value of old header at unlock time
1758 const Register lock_tmp = r14; // Temporary used by lightweight_lock/unlock
1759 const Register tmp = lr;
1760
1761 Label slow_path_lock;
1762 Label lock_done;
1763
1764 if (method->is_synchronized()) {
1765 Label count;
1766 const int mark_word_offset = BasicLock::displaced_header_offset_in_bytes();
1767
1768 // Get the handle (the 2nd argument)
1769 __ mov(oop_handle_reg, c_rarg1);
1770
1771 // Get address of the box
1772
1773 __ lea(lock_reg, Address(sp, lock_slot_offset * VMRegImpl::stack_slot_size));
1774
1775 // Load the oop from the handle
1776 __ ldr(obj_reg, Address(oop_handle_reg, 0));
1777
1778 if (LockingMode == LM_MONITOR) {
1779 __ b(slow_path_lock);
1780 } else if (LockingMode == LM_LEGACY) {
1781 // Load (object->mark() | 1) into swap_reg %r0
1782 __ ldr(rscratch1, Address(obj_reg, oopDesc::mark_offset_in_bytes()));
1783 __ orr(swap_reg, rscratch1, 1);
1784
1785 // Save (object->mark() | 1) into BasicLock's displaced header
1786 __ str(swap_reg, Address(lock_reg, mark_word_offset));
1787
1788 // src -> dest iff dest == r0 else r0 <- dest
1789 __ cmpxchg_obj_header(r0, lock_reg, obj_reg, rscratch1, count, /*fallthrough*/nullptr);
1790
1791 // Hmm should this move to the slow path code area???
1792
1793 // Test if the oopMark is an obvious stack pointer, i.e.,
1794 // 1) (mark & 3) == 0, and
1795 // 2) sp <= mark < mark + os::pagesize()
1796 // These 3 tests can be done by evaluating the following
1797 // expression: ((mark - sp) & (3 - os::vm_page_size())),
1798 // assuming both stack pointer and pagesize have their
1799 // least significant 2 bits clear.
1800 // NOTE: the oopMark is in swap_reg %r0 as the result of cmpxchg
1801
1802 __ sub(swap_reg, sp, swap_reg);
1803 __ neg(swap_reg, swap_reg);
1804 __ ands(swap_reg, swap_reg, 3 - (int)os::vm_page_size());
1805
1806 // Save the test result, for recursive case, the result is zero
1807 __ str(swap_reg, Address(lock_reg, mark_word_offset));
1808 __ br(Assembler::NE, slow_path_lock);
1809
1810 __ bind(count);
1811 __ inc_held_monitor_count(rscratch1);
1812 } else {
1813 assert(LockingMode == LM_LIGHTWEIGHT, "must be");
1814 __ lightweight_lock(lock_reg, obj_reg, swap_reg, tmp, lock_tmp, slow_path_lock);
1815 }
1816
1817 // Slow path will re-enter here
1818 __ bind(lock_done);
1819 }
1820
1821
1822 // Finally just about ready to make the JNI call
1823
1824 // get JNIEnv* which is first argument to native
1825 __ lea(c_rarg0, Address(rthread, in_bytes(JavaThread::jni_environment_offset())));
1826
1827 // Now set thread in native
1828 __ mov(rscratch1, _thread_in_native);
1829 __ lea(rscratch2, Address(rthread, JavaThread::thread_state_offset()));
1830 __ stlrw(rscratch1, rscratch2);
1831
1832 __ rt_call(native_func);
1833
1834 // Verify or restore cpu control state after JNI call
1835 __ restore_cpu_control_state_after_jni(rscratch1, rscratch2);
1836
1837 // Unpack native results.
1838 switch (ret_type) {
1839 case T_BOOLEAN: __ c2bool(r0); break;
1840 case T_CHAR : __ ubfx(r0, r0, 0, 16); break;
1841 case T_BYTE : __ sbfx(r0, r0, 0, 8); break;
1842 case T_SHORT : __ sbfx(r0, r0, 0, 16); break;
1843 case T_INT : __ sbfx(r0, r0, 0, 32); break;
1844 case T_DOUBLE :
1845 case T_FLOAT :
1846 // Result is in v0 we'll save as needed
1847 break;
1848 case T_ARRAY: // Really a handle
1849 case T_OBJECT: // Really a handle
1850 break; // can't de-handlize until after safepoint check
1851 case T_VOID: break;
1852 case T_LONG: break;
1853 default : ShouldNotReachHere();
1854 }
1855
1856 Label safepoint_in_progress, safepoint_in_progress_done;
1857
1858 // Switch thread to "native transition" state before reading the synchronization state.
1859 // This additional state is necessary because reading and testing the synchronization
1860 // state is not atomic w.r.t. GC, as this scenario demonstrates:
1861 // Java thread A, in _thread_in_native state, loads _not_synchronized and is preempted.
1862 // VM thread changes sync state to synchronizing and suspends threads for GC.
1863 // Thread A is resumed to finish this native method, but doesn't block here since it
1864 // didn't see any synchronization is progress, and escapes.
1865 __ mov(rscratch1, _thread_in_native_trans);
1866
1867 __ strw(rscratch1, Address(rthread, JavaThread::thread_state_offset()));
1868
1869 // Force this write out before the read below
1870 if (!UseSystemMemoryBarrier) {
1871 __ dmb(Assembler::ISH);
1872 }
1873
1874 __ verify_sve_vector_length();
1875
1876 // Check for safepoint operation in progress and/or pending suspend requests.
1877 {
1878 // No need for acquire as Java threads always disarm themselves.
1879 __ safepoint_poll(safepoint_in_progress, true /* at_return */, false /* acquire */, false /* in_nmethod */);
1880 __ ldrw(rscratch1, Address(rthread, JavaThread::suspend_flags_offset()));
1881 __ cbnzw(rscratch1, safepoint_in_progress);
1882 __ bind(safepoint_in_progress_done);
1883 }
1884
1885 // change thread state
1886 __ mov(rscratch1, _thread_in_Java);
1887 __ lea(rscratch2, Address(rthread, JavaThread::thread_state_offset()));
1888 __ stlrw(rscratch1, rscratch2);
1889
1890 if (LockingMode != LM_LEGACY && method->is_object_wait0()) {
1891 // Check preemption for Object.wait()
1892 __ ldr(rscratch1, Address(rthread, JavaThread::preempt_alternate_return_offset()));
1893 __ cbz(rscratch1, native_return);
1894 __ str(zr, Address(rthread, JavaThread::preempt_alternate_return_offset()));
1895 __ br(rscratch1);
1896 __ bind(native_return);
1897
1898 intptr_t the_pc = (intptr_t) __ pc();
1899 oop_maps->add_gc_map(the_pc - start, map);
1900 }
1901
1902 Label reguard;
1903 Label reguard_done;
1904 __ ldrb(rscratch1, Address(rthread, JavaThread::stack_guard_state_offset()));
1905 __ cmpw(rscratch1, StackOverflow::stack_guard_yellow_reserved_disabled);
1906 __ br(Assembler::EQ, reguard);
1907 __ bind(reguard_done);
1908
1909 // native result if any is live
1910
1911 // Unlock
1912 Label unlock_done;
1913 Label slow_path_unlock;
1914 if (method->is_synchronized()) {
1915
1916 // Get locked oop from the handle we passed to jni
1917 __ ldr(obj_reg, Address(oop_handle_reg, 0));
1918
1919 Label done, not_recursive;
1920
1921 if (LockingMode == LM_LEGACY) {
1922 // Simple recursive lock?
1923 __ ldr(rscratch1, Address(sp, lock_slot_offset * VMRegImpl::stack_slot_size));
1924 __ cbnz(rscratch1, not_recursive);
1925 __ dec_held_monitor_count(rscratch1);
1926 __ b(done);
1927 }
1928
1929 __ bind(not_recursive);
1930
1931 // Must save r0 if if it is live now because cmpxchg must use it
1932 if (ret_type != T_FLOAT && ret_type != T_DOUBLE && ret_type != T_VOID) {
1933 save_native_result(masm, ret_type, stack_slots);
1934 }
1935
1936 if (LockingMode == LM_MONITOR) {
1937 __ b(slow_path_unlock);
1938 } else if (LockingMode == LM_LEGACY) {
1939 // get address of the stack lock
1940 __ lea(r0, Address(sp, lock_slot_offset * VMRegImpl::stack_slot_size));
1941 // get old displaced header
1942 __ ldr(old_hdr, Address(r0, 0));
1943
1944 // Atomic swap old header if oop still contains the stack lock
1945 Label count;
1946 __ cmpxchg_obj_header(r0, old_hdr, obj_reg, rscratch1, count, &slow_path_unlock);
1947 __ bind(count);
1948 __ dec_held_monitor_count(rscratch1);
1949 } else {
1950 assert(LockingMode == LM_LIGHTWEIGHT, "");
1951 __ lightweight_unlock(obj_reg, old_hdr, swap_reg, lock_tmp, slow_path_unlock);
1952 }
1953
1954 // slow path re-enters here
1955 __ bind(unlock_done);
1956 if (ret_type != T_FLOAT && ret_type != T_DOUBLE && ret_type != T_VOID) {
1957 restore_native_result(masm, ret_type, stack_slots);
1958 }
1959
1960 __ bind(done);
1961 }
1962
1963 Label dtrace_method_exit, dtrace_method_exit_done;
1964 if (DTraceMethodProbes) {
1965 __ b(dtrace_method_exit);
1966 __ bind(dtrace_method_exit_done);
1967 }
1968
1969 __ reset_last_Java_frame(false);
1970
1971 // Unbox oop result, e.g. JNIHandles::resolve result.
1972 if (is_reference_type(ret_type)) {
1973 __ resolve_jobject(r0, r1, r2);
1974 }
1975
1976 if (CheckJNICalls) {
1977 // clear_pending_jni_exception_check
1978 __ str(zr, Address(rthread, JavaThread::pending_jni_exception_check_fn_offset()));
1979 }
1980
1981 // reset handle block
1982 __ ldr(r2, Address(rthread, JavaThread::active_handles_offset()));
1983 __ str(zr, Address(r2, JNIHandleBlock::top_offset()));
1984
1985 __ leave();
1986
1987 // Any exception pending?
1988 __ ldr(rscratch1, Address(rthread, in_bytes(Thread::pending_exception_offset())));
1989 __ cbnz(rscratch1, exception_pending);
1990
1991 // We're done
1992 __ ret(lr);
1993
1994 // Unexpected paths are out of line and go here
1995
1996 // forward the exception
1997 __ bind(exception_pending);
1998
1999 // and forward the exception
2000 __ far_jump(RuntimeAddress(StubRoutines::forward_exception_entry()));
2001
2002 // Slow path locking & unlocking
2003 if (method->is_synchronized()) {
2004
2005 __ block_comment("Slow path lock {");
2006 __ bind(slow_path_lock);
2007
2008 // has last_Java_frame setup. No exceptions so do vanilla call not call_VM
2009 // args are (oop obj, BasicLock* lock, JavaThread* thread)
2010
2011 // protect the args we've loaded
2012 save_args(masm, total_c_args, c_arg, out_regs);
2013
2014 __ mov(c_rarg0, obj_reg);
2015 __ mov(c_rarg1, lock_reg);
2016 __ mov(c_rarg2, rthread);
2017
2018 // Not a leaf but we have last_Java_frame setup as we want.
2019 // We don't want to unmount in case of contention since that would complicate preserving
2020 // the arguments that had already been marshalled into the native convention. So we force
2021 // the freeze slow path to find this native wrapper frame (see recurse_freeze_native_frame())
2022 // and pin the vthread. Otherwise the fast path won't find it since we don't walk the stack.
2023 __ push_cont_fastpath();
2024 __ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::complete_monitor_locking_C), 3);
2025 __ pop_cont_fastpath();
2026 restore_args(masm, total_c_args, c_arg, out_regs);
2027
2028 #ifdef ASSERT
2029 { Label L;
2030 __ ldr(rscratch1, Address(rthread, in_bytes(Thread::pending_exception_offset())));
2031 __ cbz(rscratch1, L);
2032 __ stop("no pending exception allowed on exit from monitorenter");
2033 __ bind(L);
2034 }
2035 #endif
2036 __ b(lock_done);
2037
2038 __ block_comment("} Slow path lock");
2039
2040 __ block_comment("Slow path unlock {");
2041 __ bind(slow_path_unlock);
2042
2043 // If we haven't already saved the native result we must save it now as xmm registers
2044 // are still exposed.
2045
2046 if (ret_type == T_FLOAT || ret_type == T_DOUBLE ) {
2047 save_native_result(masm, ret_type, stack_slots);
2048 }
2049
2050 __ mov(c_rarg2, rthread);
2051 __ lea(c_rarg1, Address(sp, lock_slot_offset * VMRegImpl::stack_slot_size));
2052 __ mov(c_rarg0, obj_reg);
2053
2054 // Save pending exception around call to VM (which contains an EXCEPTION_MARK)
2055 // NOTE that obj_reg == r19 currently
2056 __ ldr(r19, Address(rthread, in_bytes(Thread::pending_exception_offset())));
2057 __ str(zr, Address(rthread, in_bytes(Thread::pending_exception_offset())));
2058
2059 __ rt_call(CAST_FROM_FN_PTR(address, SharedRuntime::complete_monitor_unlocking_C));
2060
2061 #ifdef ASSERT
2062 {
2063 Label L;
2064 __ ldr(rscratch1, Address(rthread, in_bytes(Thread::pending_exception_offset())));
2065 __ cbz(rscratch1, L);
2066 __ stop("no pending exception allowed on exit complete_monitor_unlocking_C");
2067 __ bind(L);
2068 }
2069 #endif /* ASSERT */
2070
2071 __ str(r19, Address(rthread, in_bytes(Thread::pending_exception_offset())));
2072
2073 if (ret_type == T_FLOAT || ret_type == T_DOUBLE ) {
2074 restore_native_result(masm, ret_type, stack_slots);
2075 }
2076 __ b(unlock_done);
2077
2078 __ block_comment("} Slow path unlock");
2079
2080 } // synchronized
2081
2082 // SLOW PATH Reguard the stack if needed
2083
2084 __ bind(reguard);
2085 save_native_result(masm, ret_type, stack_slots);
2086 __ rt_call(CAST_FROM_FN_PTR(address, SharedRuntime::reguard_yellow_pages));
2087 restore_native_result(masm, ret_type, stack_slots);
2088 // and continue
2089 __ b(reguard_done);
2090
2091 // SLOW PATH safepoint
2092 {
2093 __ block_comment("safepoint {");
2094 __ bind(safepoint_in_progress);
2095
2096 // Don't use call_VM as it will see a possible pending exception and forward it
2097 // and never return here preventing us from clearing _last_native_pc down below.
2098 //
2099 save_native_result(masm, ret_type, stack_slots);
2100 __ mov(c_rarg0, rthread);
2101 #ifndef PRODUCT
2102 assert(frame::arg_reg_save_area_bytes == 0, "not expecting frame reg save area");
2103 #endif
2104 __ lea(rscratch1, RuntimeAddress(CAST_FROM_FN_PTR(address, JavaThread::check_special_condition_for_native_trans)));
2105 __ blr(rscratch1);
2106
2107 // Restore any method result value
2108 restore_native_result(masm, ret_type, stack_slots);
2109
2110 __ b(safepoint_in_progress_done);
2111 __ block_comment("} safepoint");
2112 }
2113
2114 // SLOW PATH dtrace support
2115 if (DTraceMethodProbes) {
2116 {
2117 __ block_comment("dtrace entry {");
2118 __ bind(dtrace_method_entry);
2119
2120 // We have all of the arguments setup at this point. We must not touch any register
2121 // argument registers at this point (what if we save/restore them there are no oop?
2122
2123 save_args(masm, total_c_args, c_arg, out_regs);
2124 __ mov_metadata(c_rarg1, method());
2125 __ call_VM_leaf(
2126 CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_entry),
2127 rthread, c_rarg1);
2128 restore_args(masm, total_c_args, c_arg, out_regs);
2129 __ b(dtrace_method_entry_done);
2130 __ block_comment("} dtrace entry");
2131 }
2132
2133 {
2134 __ block_comment("dtrace exit {");
2135 __ bind(dtrace_method_exit);
2136 save_native_result(masm, ret_type, stack_slots);
2137 __ mov_metadata(c_rarg1, method());
2138 __ call_VM_leaf(
2139 CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_exit),
2140 rthread, c_rarg1);
2141 restore_native_result(masm, ret_type, stack_slots);
2142 __ b(dtrace_method_exit_done);
2143 __ block_comment("} dtrace exit");
2144 }
2145 }
2146
2147 __ flush();
2148
2149 nmethod *nm = nmethod::new_native_nmethod(method,
2150 compile_id,
2151 masm->code(),
2152 vep_offset,
2153 frame_complete,
2154 stack_slots / VMRegImpl::slots_per_word,
2155 (is_static ? in_ByteSize(klass_offset) : in_ByteSize(receiver_offset)),
2156 in_ByteSize(lock_slot_offset*VMRegImpl::stack_slot_size),
2157 oop_maps);
2158
2159 return nm;
2160 }
2161
2162 // this function returns the adjust size (in number of words) to a c2i adapter
2163 // activation for use during deoptimization
2164 int Deoptimization::last_frame_adjust(int callee_parameters, int callee_locals) {
2165 assert(callee_locals >= callee_parameters,
2166 "test and remove; got more parms than locals");
2167 if (callee_locals < callee_parameters)
2168 return 0; // No adjustment for negative locals
2169 int diff = (callee_locals - callee_parameters) * Interpreter::stackElementWords;
2170 // diff is counted in stack words
2171 return align_up(diff, 2);
2172 }
2173
2174
2175 //------------------------------generate_deopt_blob----------------------------
2176 void SharedRuntime::generate_deopt_blob() {
2177 // Allocate space for the code
2178 ResourceMark rm;
2179 // Setup code generation tools
2180 int pad = 0;
2181 #if INCLUDE_JVMCI
2182 if (EnableJVMCI) {
2183 pad += 512; // Increase the buffer size when compiling for JVMCI
2184 }
2185 #endif
2186 const char* name = SharedRuntime::stub_name(SharedStubId::deopt_id);
2187 CodeBuffer buffer(name, 2048+pad, 1024);
2188 MacroAssembler* masm = new MacroAssembler(&buffer);
2189 int frame_size_in_words;
2190 OopMap* map = nullptr;
2191 OopMapSet *oop_maps = new OopMapSet();
2192 RegisterSaver reg_save(COMPILER2_OR_JVMCI != 0);
2193
2194 // -------------
2195 // This code enters when returning to a de-optimized nmethod. A return
2196 // address has been pushed on the stack, and return values are in
2197 // registers.
2198 // If we are doing a normal deopt then we were called from the patched
2199 // nmethod from the point we returned to the nmethod. So the return
2200 // address on the stack is wrong by NativeCall::instruction_size
2201 // We will adjust the value so it looks like we have the original return
2202 // address on the stack (like when we eagerly deoptimized).
2203 // In the case of an exception pending when deoptimizing, we enter
2204 // with a return address on the stack that points after the call we patched
2205 // into the exception handler. We have the following register state from,
2206 // e.g., the forward exception stub (see stubGenerator_x86_64.cpp).
2207 // r0: exception oop
2208 // r19: exception handler
2209 // r3: throwing pc
2210 // So in this case we simply jam r3 into the useless return address and
2211 // the stack looks just like we want.
2212 //
2213 // At this point we need to de-opt. We save the argument return
2214 // registers. We call the first C routine, fetch_unroll_info(). This
2215 // routine captures the return values and returns a structure which
2216 // describes the current frame size and the sizes of all replacement frames.
2217 // The current frame is compiled code and may contain many inlined
2218 // functions, each with their own JVM state. We pop the current frame, then
2219 // push all the new frames. Then we call the C routine unpack_frames() to
2220 // populate these frames. Finally unpack_frames() returns us the new target
2221 // address. Notice that callee-save registers are BLOWN here; they have
2222 // already been captured in the vframeArray at the time the return PC was
2223 // patched.
2224 address start = __ pc();
2225 Label cont;
2226
2227 // Prolog for non exception case!
2228
2229 // Save everything in sight.
2230 map = reg_save.save_live_registers(masm, 0, &frame_size_in_words);
2231
2232 // Normal deoptimization. Save exec mode for unpack_frames.
2233 __ movw(rcpool, Deoptimization::Unpack_deopt); // callee-saved
2234 __ b(cont);
2235
2236 int reexecute_offset = __ pc() - start;
2237 #if INCLUDE_JVMCI && !defined(COMPILER1)
2238 if (UseJVMCICompiler) {
2239 // JVMCI does not use this kind of deoptimization
2240 __ should_not_reach_here();
2241 }
2242 #endif
2243
2244 // Reexecute case
2245 // return address is the pc describes what bci to do re-execute at
2246
2247 // No need to update map as each call to save_live_registers will produce identical oopmap
2248 (void) reg_save.save_live_registers(masm, 0, &frame_size_in_words);
2249
2250 __ movw(rcpool, Deoptimization::Unpack_reexecute); // callee-saved
2251 __ b(cont);
2252
2253 #if INCLUDE_JVMCI
2254 Label after_fetch_unroll_info_call;
2255 int implicit_exception_uncommon_trap_offset = 0;
2256 int uncommon_trap_offset = 0;
2257
2258 if (EnableJVMCI) {
2259 implicit_exception_uncommon_trap_offset = __ pc() - start;
2260
2261 __ ldr(lr, Address(rthread, in_bytes(JavaThread::jvmci_implicit_exception_pc_offset())));
2262 __ str(zr, Address(rthread, in_bytes(JavaThread::jvmci_implicit_exception_pc_offset())));
2263
2264 uncommon_trap_offset = __ pc() - start;
2265
2266 // Save everything in sight.
2267 reg_save.save_live_registers(masm, 0, &frame_size_in_words);
2268 // fetch_unroll_info needs to call last_java_frame()
2269 Label retaddr;
2270 __ set_last_Java_frame(sp, noreg, retaddr, rscratch1);
2271
2272 __ ldrw(c_rarg1, Address(rthread, in_bytes(JavaThread::pending_deoptimization_offset())));
2273 __ movw(rscratch1, -1);
2274 __ strw(rscratch1, Address(rthread, in_bytes(JavaThread::pending_deoptimization_offset())));
2275
2276 __ movw(rcpool, (int32_t)Deoptimization::Unpack_reexecute);
2277 __ mov(c_rarg0, rthread);
2278 __ movw(c_rarg2, rcpool); // exec mode
2279 __ lea(rscratch1,
2280 RuntimeAddress(CAST_FROM_FN_PTR(address,
2281 Deoptimization::uncommon_trap)));
2282 __ blr(rscratch1);
2283 __ bind(retaddr);
2284 oop_maps->add_gc_map( __ pc()-start, map->deep_copy());
2285
2286 __ reset_last_Java_frame(false);
2287
2288 __ b(after_fetch_unroll_info_call);
2289 } // EnableJVMCI
2290 #endif // INCLUDE_JVMCI
2291
2292 int exception_offset = __ pc() - start;
2293
2294 // Prolog for exception case
2295
2296 // all registers are dead at this entry point, except for r0, and
2297 // r3 which contain the exception oop and exception pc
2298 // respectively. Set them in TLS and fall thru to the
2299 // unpack_with_exception_in_tls entry point.
2300
2301 __ str(r3, Address(rthread, JavaThread::exception_pc_offset()));
2302 __ str(r0, Address(rthread, JavaThread::exception_oop_offset()));
2303
2304 int exception_in_tls_offset = __ pc() - start;
2305
2306 // new implementation because exception oop is now passed in JavaThread
2307
2308 // Prolog for exception case
2309 // All registers must be preserved because they might be used by LinearScan
2310 // Exceptiop oop and throwing PC are passed in JavaThread
2311 // tos: stack at point of call to method that threw the exception (i.e. only
2312 // args are on the stack, no return address)
2313
2314 // The return address pushed by save_live_registers will be patched
2315 // later with the throwing pc. The correct value is not available
2316 // now because loading it from memory would destroy registers.
2317
2318 // NB: The SP at this point must be the SP of the method that is
2319 // being deoptimized. Deoptimization assumes that the frame created
2320 // here by save_live_registers is immediately below the method's SP.
2321 // This is a somewhat fragile mechanism.
2322
2323 // Save everything in sight.
2324 map = reg_save.save_live_registers(masm, 0, &frame_size_in_words);
2325
2326 // Now it is safe to overwrite any register
2327
2328 // Deopt during an exception. Save exec mode for unpack_frames.
2329 __ mov(rcpool, Deoptimization::Unpack_exception); // callee-saved
2330
2331 // load throwing pc from JavaThread and patch it as the return address
2332 // of the current frame. Then clear the field in JavaThread
2333 __ ldr(r3, Address(rthread, JavaThread::exception_pc_offset()));
2334 __ protect_return_address(r3);
2335 __ str(r3, Address(rfp, wordSize));
2336 __ str(zr, Address(rthread, JavaThread::exception_pc_offset()));
2337
2338 #ifdef ASSERT
2339 // verify that there is really an exception oop in JavaThread
2340 __ ldr(r0, Address(rthread, JavaThread::exception_oop_offset()));
2341 __ verify_oop(r0);
2342
2343 // verify that there is no pending exception
2344 Label no_pending_exception;
2345 __ ldr(rscratch1, Address(rthread, Thread::pending_exception_offset()));
2346 __ cbz(rscratch1, no_pending_exception);
2347 __ stop("must not have pending exception here");
2348 __ bind(no_pending_exception);
2349 #endif
2350
2351 __ bind(cont);
2352
2353 // Call C code. Need thread and this frame, but NOT official VM entry
2354 // crud. We cannot block on this call, no GC can happen.
2355 //
2356 // UnrollBlock* fetch_unroll_info(JavaThread* thread)
2357
2358 // fetch_unroll_info needs to call last_java_frame().
2359
2360 Label retaddr;
2361 __ set_last_Java_frame(sp, noreg, retaddr, rscratch1);
2362 #ifdef ASSERT
2363 { Label L;
2364 __ ldr(rscratch1, Address(rthread, JavaThread::last_Java_fp_offset()));
2365 __ cbz(rscratch1, L);
2366 __ stop("SharedRuntime::generate_deopt_blob: last_Java_fp not cleared");
2367 __ bind(L);
2368 }
2369 #endif // ASSERT
2370 __ mov(c_rarg0, rthread);
2371 __ mov(c_rarg1, rcpool);
2372 __ lea(rscratch1, RuntimeAddress(CAST_FROM_FN_PTR(address, Deoptimization::fetch_unroll_info)));
2373 __ blr(rscratch1);
2374 __ bind(retaddr);
2375
2376 // Need to have an oopmap that tells fetch_unroll_info where to
2377 // find any register it might need.
2378 oop_maps->add_gc_map(__ pc() - start, map);
2379
2380 __ reset_last_Java_frame(false);
2381
2382 #if INCLUDE_JVMCI
2383 if (EnableJVMCI) {
2384 __ bind(after_fetch_unroll_info_call);
2385 }
2386 #endif
2387
2388 // Load UnrollBlock* into r5
2389 __ mov(r5, r0);
2390
2391 __ ldrw(rcpool, Address(r5, Deoptimization::UnrollBlock::unpack_kind_offset()));
2392 Label noException;
2393 __ cmpw(rcpool, Deoptimization::Unpack_exception); // Was exception pending?
2394 __ br(Assembler::NE, noException);
2395 __ ldr(r0, Address(rthread, JavaThread::exception_oop_offset()));
2396 // QQQ this is useless it was null above
2397 __ ldr(r3, Address(rthread, JavaThread::exception_pc_offset()));
2398 __ str(zr, Address(rthread, JavaThread::exception_oop_offset()));
2399 __ str(zr, Address(rthread, JavaThread::exception_pc_offset()));
2400
2401 __ verify_oop(r0);
2402
2403 // Overwrite the result registers with the exception results.
2404 __ str(r0, Address(sp, reg_save.r0_offset_in_bytes()));
2405 // I think this is useless
2406 // __ str(r3, Address(sp, RegisterSaver::r3_offset_in_bytes()));
2407
2408 __ bind(noException);
2409
2410 // Only register save data is on the stack.
2411 // Now restore the result registers. Everything else is either dead
2412 // or captured in the vframeArray.
2413
2414 // Restore fp result register
2415 __ ldrd(v0, Address(sp, reg_save.v0_offset_in_bytes()));
2416 // Restore integer result register
2417 __ ldr(r0, Address(sp, reg_save.r0_offset_in_bytes()));
2418
2419 // Pop all of the register save area off the stack
2420 __ add(sp, sp, frame_size_in_words * wordSize);
2421
2422 // All of the register save area has been popped of the stack. Only the
2423 // return address remains.
2424
2425 // Pop all the frames we must move/replace.
2426 //
2427 // Frame picture (youngest to oldest)
2428 // 1: self-frame (no frame link)
2429 // 2: deopting frame (no frame link)
2430 // 3: caller of deopting frame (could be compiled/interpreted).
2431 //
2432 // Note: by leaving the return address of self-frame on the stack
2433 // and using the size of frame 2 to adjust the stack
2434 // when we are done the return to frame 3 will still be on the stack.
2435
2436 // Pop deoptimized frame
2437 __ ldrw(r2, Address(r5, Deoptimization::UnrollBlock::size_of_deoptimized_frame_offset()));
2438 __ sub(r2, r2, 2 * wordSize);
2439 __ add(sp, sp, r2);
2440 __ ldp(rfp, zr, __ post(sp, 2 * wordSize));
2441
2442 #ifdef ASSERT
2443 // Compilers generate code that bang the stack by as much as the
2444 // interpreter would need. So this stack banging should never
2445 // trigger a fault. Verify that it does not on non product builds.
2446 __ ldrw(r19, Address(r5, Deoptimization::UnrollBlock::total_frame_sizes_offset()));
2447 __ bang_stack_size(r19, r2);
2448 #endif
2449 // Load address of array of frame pcs into r2
2450 __ ldr(r2, Address(r5, Deoptimization::UnrollBlock::frame_pcs_offset()));
2451
2452 // Trash the old pc
2453 // __ addptr(sp, wordSize); FIXME ????
2454
2455 // Load address of array of frame sizes into r4
2456 __ ldr(r4, Address(r5, Deoptimization::UnrollBlock::frame_sizes_offset()));
2457
2458 // Load counter into r3
2459 __ ldrw(r3, Address(r5, Deoptimization::UnrollBlock::number_of_frames_offset()));
2460
2461 // Now adjust the caller's stack to make up for the extra locals
2462 // but record the original sp so that we can save it in the skeletal interpreter
2463 // frame and the stack walking of interpreter_sender will get the unextended sp
2464 // value and not the "real" sp value.
2465
2466 const Register sender_sp = r6;
2467
2468 __ mov(sender_sp, sp);
2469 __ ldrw(r19, Address(r5,
2470 Deoptimization::UnrollBlock::
2471 caller_adjustment_offset()));
2472 __ sub(sp, sp, r19);
2473
2474 // Push interpreter frames in a loop
2475 __ mov(rscratch1, (uint64_t)0xDEADDEAD); // Make a recognizable pattern
2476 __ mov(rscratch2, rscratch1);
2477 Label loop;
2478 __ bind(loop);
2479 __ ldr(r19, Address(__ post(r4, wordSize))); // Load frame size
2480 __ sub(r19, r19, 2*wordSize); // We'll push pc and fp by hand
2481 __ ldr(lr, Address(__ post(r2, wordSize))); // Load pc
2482 __ enter(); // Save old & set new fp
2483 __ sub(sp, sp, r19); // Prolog
2484 // This value is corrected by layout_activation_impl
2485 __ str(zr, Address(rfp, frame::interpreter_frame_last_sp_offset * wordSize));
2486 __ str(sender_sp, Address(rfp, frame::interpreter_frame_sender_sp_offset * wordSize)); // Make it walkable
2487 __ mov(sender_sp, sp); // Pass sender_sp to next frame
2488 __ sub(r3, r3, 1); // Decrement counter
2489 __ cbnz(r3, loop);
2490
2491 // Re-push self-frame
2492 __ ldr(lr, Address(r2));
2493 __ enter();
2494
2495 // Allocate a full sized register save area. We subtract 2 because
2496 // enter() just pushed 2 words
2497 __ sub(sp, sp, (frame_size_in_words - 2) * wordSize);
2498
2499 // Restore frame locals after moving the frame
2500 __ strd(v0, Address(sp, reg_save.v0_offset_in_bytes()));
2501 __ str(r0, Address(sp, reg_save.r0_offset_in_bytes()));
2502
2503 // Call C code. Need thread but NOT official VM entry
2504 // crud. We cannot block on this call, no GC can happen. Call should
2505 // restore return values to their stack-slots with the new SP.
2506 //
2507 // void Deoptimization::unpack_frames(JavaThread* thread, int exec_mode)
2508
2509 // Use rfp because the frames look interpreted now
2510 // Don't need the precise return PC here, just precise enough to point into this code blob.
2511 address the_pc = __ pc();
2512 __ set_last_Java_frame(sp, rfp, the_pc, rscratch1);
2513
2514 __ mov(c_rarg0, rthread);
2515 __ movw(c_rarg1, rcpool); // second arg: exec_mode
2516 __ lea(rscratch1, RuntimeAddress(CAST_FROM_FN_PTR(address, Deoptimization::unpack_frames)));
2517 __ blr(rscratch1);
2518
2519 // Set an oopmap for the call site
2520 // Use the same PC we used for the last java frame
2521 oop_maps->add_gc_map(the_pc - start,
2522 new OopMap( frame_size_in_words, 0 ));
2523
2524 // Clear fp AND pc
2525 __ reset_last_Java_frame(true);
2526
2527 // Collect return values
2528 __ ldrd(v0, Address(sp, reg_save.v0_offset_in_bytes()));
2529 __ ldr(r0, Address(sp, reg_save.r0_offset_in_bytes()));
2530 // I think this is useless (throwing pc?)
2531 // __ ldr(r3, Address(sp, RegisterSaver::r3_offset_in_bytes()));
2532
2533 // Pop self-frame.
2534 __ leave(); // Epilog
2535
2536 // Jump to interpreter
2537 __ ret(lr);
2538
2539 // Make sure all code is generated
2540 masm->flush();
2541
2542 _deopt_blob = DeoptimizationBlob::create(&buffer, oop_maps, 0, exception_offset, reexecute_offset, frame_size_in_words);
2543 _deopt_blob->set_unpack_with_exception_in_tls_offset(exception_in_tls_offset);
2544 #if INCLUDE_JVMCI
2545 if (EnableJVMCI) {
2546 _deopt_blob->set_uncommon_trap_offset(uncommon_trap_offset);
2547 _deopt_blob->set_implicit_exception_uncommon_trap_offset(implicit_exception_uncommon_trap_offset);
2548 }
2549 #endif
2550 }
2551
2552 // Number of stack slots between incoming argument block and the start of
2553 // a new frame. The PROLOG must add this many slots to the stack. The
2554 // EPILOG must remove this many slots. aarch64 needs two slots for
2555 // return address and fp.
2556 // TODO think this is correct but check
2557 uint SharedRuntime::in_preserve_stack_slots() {
2558 return 4;
2559 }
2560
2561 uint SharedRuntime::out_preserve_stack_slots() {
2562 return 0;
2563 }
2564
2565
2566 VMReg SharedRuntime::thread_register() {
2567 return rthread->as_VMReg();
2568 }
2569
2570 //------------------------------generate_handler_blob------
2571 //
2572 // Generate a special Compile2Runtime blob that saves all registers,
2573 // and setup oopmap.
2574 //
2575 SafepointBlob* SharedRuntime::generate_handler_blob(SharedStubId id, address call_ptr) {
2576 assert(is_polling_page_id(id), "expected a polling page stub id");
2577
2578 ResourceMark rm;
2579 OopMapSet *oop_maps = new OopMapSet();
2580 OopMap* map;
2581
2582 // Allocate space for the code. Setup code generation tools.
2583 const char* name = SharedRuntime::stub_name(id);
2584 CodeBuffer buffer(name, 2048, 1024);
2585 MacroAssembler* masm = new MacroAssembler(&buffer);
2586
2587 address start = __ pc();
2588 address call_pc = nullptr;
2589 int frame_size_in_words;
2590 bool cause_return = (id == SharedStubId::polling_page_return_handler_id);
2591 RegisterSaver reg_save(id == SharedStubId::polling_page_vectors_safepoint_handler_id /* save_vectors */);
2592
2593 // When the signal occurred, the LR was either signed and stored on the stack (in which
2594 // case it will be restored from the stack before being used) or unsigned and not stored
2595 // on the stack. Stipping ensures we get the right value.
2596 __ strip_return_address();
2597
2598 // Save Integer and Float registers.
2599 map = reg_save.save_live_registers(masm, 0, &frame_size_in_words);
2600
2601 // The following is basically a call_VM. However, we need the precise
2602 // address of the call in order to generate an oopmap. Hence, we do all the
2603 // work ourselves.
2604
2605 Label retaddr;
2606 __ set_last_Java_frame(sp, noreg, retaddr, rscratch1);
2607
2608 // The return address must always be correct so that frame constructor never
2609 // sees an invalid pc.
2610
2611 if (!cause_return) {
2612 // overwrite the return address pushed by save_live_registers
2613 // Additionally, r20 is a callee-saved register so we can look at
2614 // it later to determine if someone changed the return address for
2615 // us!
2616 __ ldr(r20, Address(rthread, JavaThread::saved_exception_pc_offset()));
2617 __ protect_return_address(r20);
2618 __ str(r20, Address(rfp, wordSize));
2619 }
2620
2621 // Do the call
2622 __ mov(c_rarg0, rthread);
2623 __ lea(rscratch1, RuntimeAddress(call_ptr));
2624 __ blr(rscratch1);
2625 __ bind(retaddr);
2626
2627 // Set an oopmap for the call site. This oopmap will map all
2628 // oop-registers and debug-info registers as callee-saved. This
2629 // will allow deoptimization at this safepoint to find all possible
2630 // debug-info recordings, as well as let GC find all oops.
2631
2632 oop_maps->add_gc_map( __ pc() - start, map);
2633
2634 Label noException;
2635
2636 __ reset_last_Java_frame(false);
2637
2638 __ membar(Assembler::LoadLoad | Assembler::LoadStore);
2639
2640 __ ldr(rscratch1, Address(rthread, Thread::pending_exception_offset()));
2641 __ cbz(rscratch1, noException);
2642
2643 // Exception pending
2644
2645 reg_save.restore_live_registers(masm);
2646
2647 __ far_jump(RuntimeAddress(StubRoutines::forward_exception_entry()));
2648
2649 // No exception case
2650 __ bind(noException);
2651
2652 Label no_adjust, bail;
2653 if (!cause_return) {
2654 // If our stashed return pc was modified by the runtime we avoid touching it
2655 __ ldr(rscratch1, Address(rfp, wordSize));
2656 __ cmp(r20, rscratch1);
2657 __ br(Assembler::NE, no_adjust);
2658 __ authenticate_return_address(r20);
2659
2660 #ifdef ASSERT
2661 // Verify the correct encoding of the poll we're about to skip.
2662 // See NativeInstruction::is_ldrw_to_zr()
2663 __ ldrw(rscratch1, Address(r20));
2664 __ ubfx(rscratch2, rscratch1, 22, 10);
2665 __ cmpw(rscratch2, 0b1011100101);
2666 __ br(Assembler::NE, bail);
2667 __ ubfx(rscratch2, rscratch1, 0, 5);
2668 __ cmpw(rscratch2, 0b11111);
2669 __ br(Assembler::NE, bail);
2670 #endif
2671 // Adjust return pc forward to step over the safepoint poll instruction
2672 __ add(r20, r20, NativeInstruction::instruction_size);
2673 __ protect_return_address(r20);
2674 __ str(r20, Address(rfp, wordSize));
2675 }
2676
2677 __ bind(no_adjust);
2678 // Normal exit, restore registers and exit.
2679 reg_save.restore_live_registers(masm);
2680
2681 __ ret(lr);
2682
2683 #ifdef ASSERT
2684 __ bind(bail);
2685 __ stop("Attempting to adjust pc to skip safepoint poll but the return point is not what we expected");
2686 #endif
2687
2688 // Make sure all code is generated
2689 masm->flush();
2690
2691 // Fill-out other meta info
2692 return SafepointBlob::create(&buffer, oop_maps, frame_size_in_words);
2693 }
2694
2695 //
2696 // generate_resolve_blob - call resolution (static/virtual/opt-virtual/ic-miss
2697 //
2698 // Generate a stub that calls into vm to find out the proper destination
2699 // of a java call. All the argument registers are live at this point
2700 // but since this is generic code we don't know what they are and the caller
2701 // must do any gc of the args.
2702 //
2703 RuntimeStub* SharedRuntime::generate_resolve_blob(SharedStubId id, address destination) {
2704 assert (StubRoutines::forward_exception_entry() != nullptr, "must be generated before");
2705 assert(is_resolve_id(id), "expected a resolve stub id");
2706
2707 // allocate space for the code
2708 ResourceMark rm;
2709
2710 const char* name = SharedRuntime::stub_name(id);
2711 CodeBuffer buffer(name, 1000, 512);
2712 MacroAssembler* masm = new MacroAssembler(&buffer);
2713
2714 int frame_size_in_words;
2715 RegisterSaver reg_save(false /* save_vectors */);
2716
2717 OopMapSet *oop_maps = new OopMapSet();
2718 OopMap* map = nullptr;
2719
2720 int start = __ offset();
2721
2722 map = reg_save.save_live_registers(masm, 0, &frame_size_in_words);
2723
2724 int frame_complete = __ offset();
2725
2726 {
2727 Label retaddr;
2728 __ set_last_Java_frame(sp, noreg, retaddr, rscratch1);
2729
2730 __ mov(c_rarg0, rthread);
2731 __ lea(rscratch1, RuntimeAddress(destination));
2732
2733 __ blr(rscratch1);
2734 __ bind(retaddr);
2735 }
2736
2737 // Set an oopmap for the call site.
2738 // We need this not only for callee-saved registers, but also for volatile
2739 // registers that the compiler might be keeping live across a safepoint.
2740
2741 oop_maps->add_gc_map( __ offset() - start, map);
2742
2743 // r0 contains the address we are going to jump to assuming no exception got installed
2744
2745 // clear last_Java_sp
2746 __ reset_last_Java_frame(false);
2747 // check for pending exceptions
2748 Label pending;
2749 __ ldr(rscratch1, Address(rthread, Thread::pending_exception_offset()));
2750 __ cbnz(rscratch1, pending);
2751
2752 // get the returned Method*
2753 __ get_vm_result_metadata(rmethod, rthread);
2754 __ str(rmethod, Address(sp, reg_save.reg_offset_in_bytes(rmethod)));
2755
2756 // r0 is where we want to jump, overwrite rscratch1 which is saved and scratch
2757 __ str(r0, Address(sp, reg_save.rscratch1_offset_in_bytes()));
2758 reg_save.restore_live_registers(masm);
2759
2760 // We are back to the original state on entry and ready to go.
2761
2762 __ br(rscratch1);
2763
2764 // Pending exception after the safepoint
2765
2766 __ bind(pending);
2767
2768 reg_save.restore_live_registers(masm);
2769
2770 // exception pending => remove activation and forward to exception handler
2771
2772 __ str(zr, Address(rthread, JavaThread::vm_result_oop_offset()));
2773
2774 __ ldr(r0, Address(rthread, Thread::pending_exception_offset()));
2775 __ far_jump(RuntimeAddress(StubRoutines::forward_exception_entry()));
2776
2777 // -------------
2778 // make sure all code is generated
2779 masm->flush();
2780
2781 // return the blob
2782 // frame_size_words or bytes??
2783 return RuntimeStub::new_runtime_stub(name, &buffer, frame_complete, frame_size_in_words, oop_maps, true);
2784 }
2785
2786 // Continuation point for throwing of implicit exceptions that are
2787 // not handled in the current activation. Fabricates an exception
2788 // oop and initiates normal exception dispatching in this
2789 // frame. Since we need to preserve callee-saved values (currently
2790 // only for C2, but done for C1 as well) we need a callee-saved oop
2791 // map and therefore have to make these stubs into RuntimeStubs
2792 // rather than BufferBlobs. If the compiler needs all registers to
2793 // be preserved between the fault point and the exception handler
2794 // then it must assume responsibility for that in
2795 // AbstractCompiler::continuation_for_implicit_null_exception or
2796 // continuation_for_implicit_division_by_zero_exception. All other
2797 // implicit exceptions (e.g., NullPointerException or
2798 // AbstractMethodError on entry) are either at call sites or
2799 // otherwise assume that stack unwinding will be initiated, so
2800 // caller saved registers were assumed volatile in the compiler.
2801
2802 RuntimeStub* SharedRuntime::generate_throw_exception(SharedStubId id, address runtime_entry) {
2803 assert(is_throw_id(id), "expected a throw stub id");
2804
2805 const char* name = SharedRuntime::stub_name(id);
2806
2807 // Information about frame layout at time of blocking runtime call.
2808 // Note that we only have to preserve callee-saved registers since
2809 // the compilers are responsible for supplying a continuation point
2810 // if they expect all registers to be preserved.
2811 // n.b. aarch64 asserts that frame::arg_reg_save_area_bytes == 0
2812 enum layout {
2813 rfp_off = 0,
2814 rfp_off2,
2815 return_off,
2816 return_off2,
2817 framesize // inclusive of return address
2818 };
2819
2820 int insts_size = 512;
2821 int locs_size = 64;
2822
2823 ResourceMark rm;
2824 const char* timer_msg = "SharedRuntime generate_throw_exception";
2825 TraceTime timer(timer_msg, TRACETIME_LOG(Info, startuptime));
2826
2827 CodeBuffer code(name, insts_size, locs_size);
2828 OopMapSet* oop_maps = new OopMapSet();
2829 MacroAssembler* masm = new MacroAssembler(&code);
2830
2831 address start = __ pc();
2832
2833 // This is an inlined and slightly modified version of call_VM
2834 // which has the ability to fetch the return PC out of
2835 // thread-local storage and also sets up last_Java_sp slightly
2836 // differently than the real call_VM
2837
2838 __ enter(); // Save FP and LR before call
2839
2840 assert(is_even(framesize/2), "sp not 16-byte aligned");
2841
2842 // lr and fp are already in place
2843 __ sub(sp, rfp, ((uint64_t)framesize-4) << LogBytesPerInt); // prolog
2844
2845 int frame_complete = __ pc() - start;
2846
2847 // Set up last_Java_sp and last_Java_fp
2848 address the_pc = __ pc();
2849 __ set_last_Java_frame(sp, rfp, the_pc, rscratch1);
2850
2851 __ mov(c_rarg0, rthread);
2852 BLOCK_COMMENT("call runtime_entry");
2853 __ mov(rscratch1, runtime_entry);
2854 __ blr(rscratch1);
2855
2856 // Generate oop map
2857 OopMap* map = new OopMap(framesize, 0);
2858
2859 oop_maps->add_gc_map(the_pc - start, map);
2860
2861 __ reset_last_Java_frame(true);
2862
2863 // Reinitialize the ptrue predicate register, in case the external runtime
2864 // call clobbers ptrue reg, as we may return to SVE compiled code.
2865 __ reinitialize_ptrue();
2866
2867 __ leave();
2868
2869 // check for pending exceptions
2870 #ifdef ASSERT
2871 Label L;
2872 __ ldr(rscratch1, Address(rthread, Thread::pending_exception_offset()));
2873 __ cbnz(rscratch1, L);
2874 __ should_not_reach_here();
2875 __ bind(L);
2876 #endif // ASSERT
2877 __ far_jump(RuntimeAddress(StubRoutines::forward_exception_entry()));
2878
2879 // codeBlob framesize is in words (not VMRegImpl::slot_size)
2880 RuntimeStub* stub =
2881 RuntimeStub::new_runtime_stub(name,
2882 &code,
2883 frame_complete,
2884 (framesize >> (LogBytesPerWord - LogBytesPerInt)),
2885 oop_maps, false);
2886 return stub;
2887 }
2888
2889 #if INCLUDE_JFR
2890
2891 static void jfr_prologue(address the_pc, MacroAssembler* masm, Register thread) {
2892 __ set_last_Java_frame(sp, rfp, the_pc, rscratch1);
2893 __ mov(c_rarg0, thread);
2894 }
2895
2896 // The handle is dereferenced through a load barrier.
2897 static void jfr_epilogue(MacroAssembler* masm) {
2898 __ reset_last_Java_frame(true);
2899 }
2900
2901 // For c2: c_rarg0 is junk, call to runtime to write a checkpoint.
2902 // It returns a jobject handle to the event writer.
2903 // The handle is dereferenced and the return value is the event writer oop.
2904 RuntimeStub* SharedRuntime::generate_jfr_write_checkpoint() {
2905 enum layout {
2906 rbp_off,
2907 rbpH_off,
2908 return_off,
2909 return_off2,
2910 framesize // inclusive of return address
2911 };
2912
2913 int insts_size = 1024;
2914 int locs_size = 64;
2915 const char* name = SharedRuntime::stub_name(SharedStubId::jfr_write_checkpoint_id);
2916 CodeBuffer code(name, insts_size, locs_size);
2917 OopMapSet* oop_maps = new OopMapSet();
2918 MacroAssembler* masm = new MacroAssembler(&code);
2919
2920 address start = __ pc();
2921 __ enter();
2922 int frame_complete = __ pc() - start;
2923 address the_pc = __ pc();
2924 jfr_prologue(the_pc, masm, rthread);
2925 __ call_VM_leaf(CAST_FROM_FN_PTR(address, JfrIntrinsicSupport::write_checkpoint), 1);
2926 jfr_epilogue(masm);
2927 __ resolve_global_jobject(r0, rscratch1, rscratch2);
2928 __ leave();
2929 __ ret(lr);
2930
2931 OopMap* map = new OopMap(framesize, 1); // rfp
2932 oop_maps->add_gc_map(the_pc - start, map);
2933
2934 RuntimeStub* stub = // codeBlob framesize is in words (not VMRegImpl::slot_size)
2935 RuntimeStub::new_runtime_stub(name, &code, frame_complete,
2936 (framesize >> (LogBytesPerWord - LogBytesPerInt)),
2937 oop_maps, false);
2938 return stub;
2939 }
2940
2941 // For c2: call to return a leased buffer.
2942 RuntimeStub* SharedRuntime::generate_jfr_return_lease() {
2943 enum layout {
2944 rbp_off,
2945 rbpH_off,
2946 return_off,
2947 return_off2,
2948 framesize // inclusive of return address
2949 };
2950
2951 int insts_size = 1024;
2952 int locs_size = 64;
2953
2954 const char* name = SharedRuntime::stub_name(SharedStubId::jfr_return_lease_id);
2955 CodeBuffer code(name, insts_size, locs_size);
2956 OopMapSet* oop_maps = new OopMapSet();
2957 MacroAssembler* masm = new MacroAssembler(&code);
2958
2959 address start = __ pc();
2960 __ enter();
2961 int frame_complete = __ pc() - start;
2962 address the_pc = __ pc();
2963 jfr_prologue(the_pc, masm, rthread);
2964 __ call_VM_leaf(CAST_FROM_FN_PTR(address, JfrIntrinsicSupport::return_lease), 1);
2965 jfr_epilogue(masm);
2966
2967 __ leave();
2968 __ ret(lr);
2969
2970 OopMap* map = new OopMap(framesize, 1); // rfp
2971 oop_maps->add_gc_map(the_pc - start, map);
2972
2973 RuntimeStub* stub = // codeBlob framesize is in words (not VMRegImpl::slot_size)
2974 RuntimeStub::new_runtime_stub(name, &code, frame_complete,
2975 (framesize >> (LogBytesPerWord - LogBytesPerInt)),
2976 oop_maps, false);
2977 return stub;
2978 }
2979
2980 #endif // INCLUDE_JFR