1 /*
2 * Copyright (c) 2003, 2024, 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 "precompiled.hpp"
28 #include "asm/macroAssembler.hpp"
29 #include "asm/macroAssembler.inline.hpp"
30 #include "code/codeCache.hpp"
31 #include "code/compiledIC.hpp"
32 #include "code/debugInfoRec.hpp"
33 #include "code/vtableStubs.hpp"
34 #include "compiler/oopMap.hpp"
35 #include "gc/shared/barrierSetAssembler.hpp"
36 #include "interpreter/interpreter.hpp"
37 #include "interpreter/interp_masm.hpp"
38 #include "logging/log.hpp"
39 #include "memory/resourceArea.hpp"
40 #include "nativeInst_aarch64.hpp"
41 #include "oops/klass.inline.hpp"
42 #include "oops/method.inline.hpp"
43 #include "prims/methodHandles.hpp"
44 #include "runtime/continuation.hpp"
45 #include "runtime/continuationEntry.inline.hpp"
46 #include "runtime/globals.hpp"
47 #include "runtime/jniHandles.hpp"
48 #include "runtime/safepointMechanism.hpp"
49 #include "runtime/sharedRuntime.hpp"
50 #include "runtime/signature.hpp"
51 #include "runtime/stubRoutines.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 const int StackAlignmentInSlots = StackAlignmentInBytes / VMRegImpl::stack_slot_size;
70
71 class SimpleRuntimeFrame {
72
73 public:
74
75 // Most of the runtime stubs have this simple frame layout.
76 // This class exists to make the layout shared in one place.
77 // Offsets are for compiler stack slots, which are jints.
78 enum layout {
79 // The frame sender code expects that rbp will be in the "natural" place and
80 // will override any oopMap setting for it. We must therefore force the layout
81 // so that it agrees with the frame sender code.
82 // we don't expect any arg reg save area so aarch64 asserts that
83 // frame::arg_reg_save_area_bytes == 0
84 rfp_off = 0,
85 rfp_off2,
86 return_off, return_off2,
87 framesize
88 };
89 };
90
91 // FIXME -- this is used by C1
92 class RegisterSaver {
93 const bool _save_vectors;
94 public:
95 RegisterSaver(bool save_vectors) : _save_vectors(save_vectors) {}
96
97 OopMap* save_live_registers(MacroAssembler* masm, int additional_frame_words, int* total_frame_words);
98 void restore_live_registers(MacroAssembler* masm);
99
100 // Offsets into the register save area
101 // Used by deoptimization when it is managing result register
102 // values on its own
103
104 int reg_offset_in_bytes(Register r);
105 int r0_offset_in_bytes() { return reg_offset_in_bytes(r0); }
106 int rscratch1_offset_in_bytes() { return reg_offset_in_bytes(rscratch1); }
107 int v0_offset_in_bytes();
108
109 // Total stack size in bytes for saving sve predicate registers.
110 int total_sve_predicate_in_bytes();
111
112 // Capture info about frame layout
113 // Note this is only correct when not saving full vectors.
114 enum layout {
115 fpu_state_off = 0,
116 fpu_state_end = fpu_state_off + FPUStateSizeInWords - 1,
117 // The frame sender code expects that rfp will be in
118 // the "natural" place and will override any oopMap
119 // setting for it. We must therefore force the layout
120 // so that it agrees with the frame sender code.
121 r0_off = fpu_state_off + FPUStateSizeInWords,
122 rfp_off = r0_off + (Register::number_of_registers - 2) * Register::max_slots_per_register,
123 return_off = rfp_off + Register::max_slots_per_register, // slot for return address
124 reg_save_size = return_off + Register::max_slots_per_register};
125
126 };
127
128 int RegisterSaver::reg_offset_in_bytes(Register r) {
129 // The integer registers are located above the floating point
130 // registers in the stack frame pushed by save_live_registers() so the
131 // offset depends on whether we are saving full vectors, and whether
132 // those vectors are NEON or SVE.
133
134 int slots_per_vect = FloatRegister::save_slots_per_register;
135
136 #if COMPILER2_OR_JVMCI
137 if (_save_vectors) {
138 slots_per_vect = FloatRegister::slots_per_neon_register;
139
140 #ifdef COMPILER2
141 if (Matcher::supports_scalable_vector()) {
142 slots_per_vect = Matcher::scalable_vector_reg_size(T_FLOAT);
143 }
144 #endif
145 }
146 #endif
147
148 int r0_offset = v0_offset_in_bytes() + (slots_per_vect * FloatRegister::number_of_registers) * BytesPerInt;
149 return r0_offset + r->encoding() * wordSize;
150 }
151
152 int RegisterSaver::v0_offset_in_bytes() {
153 // The floating point registers are located above the predicate registers if
154 // they are present in the stack frame pushed by save_live_registers(). So the
155 // offset depends on the saved total predicate vectors in the stack frame.
156 return (total_sve_predicate_in_bytes() / VMRegImpl::stack_slot_size) * BytesPerInt;
157 }
158
159 int RegisterSaver::total_sve_predicate_in_bytes() {
160 #ifdef COMPILER2
161 if (_save_vectors && Matcher::supports_scalable_vector()) {
162 return (Matcher::scalable_vector_reg_size(T_BYTE) >> LogBitsPerByte) *
163 PRegister::number_of_registers;
164 }
165 #endif
166 return 0;
167 }
168
169 OopMap* RegisterSaver::save_live_registers(MacroAssembler* masm, int additional_frame_words, int* total_frame_words) {
170 bool use_sve = false;
171 int sve_vector_size_in_bytes = 0;
172 int sve_vector_size_in_slots = 0;
173 int sve_predicate_size_in_slots = 0;
174 int total_predicate_in_bytes = total_sve_predicate_in_bytes();
175 int total_predicate_in_slots = total_predicate_in_bytes / VMRegImpl::stack_slot_size;
176
177 #ifdef COMPILER2
178 use_sve = Matcher::supports_scalable_vector();
179 if (use_sve) {
180 sve_vector_size_in_bytes = Matcher::scalable_vector_reg_size(T_BYTE);
181 sve_vector_size_in_slots = Matcher::scalable_vector_reg_size(T_FLOAT);
182 sve_predicate_size_in_slots = Matcher::scalable_predicate_reg_slots();
183 }
184 #endif
185
186 #if COMPILER2_OR_JVMCI
187 if (_save_vectors) {
188 int extra_save_slots_per_register = 0;
189 // Save upper half of vector registers
190 if (use_sve) {
191 extra_save_slots_per_register = sve_vector_size_in_slots - FloatRegister::save_slots_per_register;
192 } else {
193 extra_save_slots_per_register = FloatRegister::extra_save_slots_per_neon_register;
194 }
195 int extra_vector_bytes = extra_save_slots_per_register *
196 VMRegImpl::stack_slot_size *
197 FloatRegister::number_of_registers;
198 additional_frame_words += ((extra_vector_bytes + total_predicate_in_bytes) / wordSize);
199 }
200 #else
201 assert(!_save_vectors, "vectors are generated only by C2 and JVMCI");
202 #endif
203
204 int frame_size_in_bytes = align_up(additional_frame_words * wordSize +
205 reg_save_size * BytesPerInt, 16);
206 // OopMap frame size is in compiler stack slots (jint's) not bytes or words
207 int frame_size_in_slots = frame_size_in_bytes / BytesPerInt;
208 // The caller will allocate additional_frame_words
209 int additional_frame_slots = additional_frame_words * wordSize / BytesPerInt;
210 // CodeBlob frame size is in words.
211 int frame_size_in_words = frame_size_in_bytes / wordSize;
212 *total_frame_words = frame_size_in_words;
213
214 // Save Integer and Float registers.
215 __ enter();
216 __ push_CPU_state(_save_vectors, use_sve, sve_vector_size_in_bytes, total_predicate_in_bytes);
217
218 // Set an oopmap for the call site. This oopmap will map all
219 // oop-registers and debug-info registers as callee-saved. This
220 // will allow deoptimization at this safepoint to find all possible
221 // debug-info recordings, as well as let GC find all oops.
222
223 OopMapSet *oop_maps = new OopMapSet();
224 OopMap* oop_map = new OopMap(frame_size_in_slots, 0);
225
226 for (int i = 0; i < Register::number_of_registers; i++) {
227 Register r = as_Register(i);
228 if (i <= rfp->encoding() && r != rscratch1 && r != rscratch2) {
229 // SP offsets are in 4-byte words.
230 // Register slots are 8 bytes wide, 32 floating-point registers.
231 int sp_offset = Register::max_slots_per_register * i +
232 FloatRegister::save_slots_per_register * FloatRegister::number_of_registers;
233 oop_map->set_callee_saved(VMRegImpl::stack2reg(sp_offset + additional_frame_slots), r->as_VMReg());
234 }
235 }
236
237 for (int i = 0; i < FloatRegister::number_of_registers; i++) {
238 FloatRegister r = as_FloatRegister(i);
239 int sp_offset = 0;
240 if (_save_vectors) {
241 sp_offset = use_sve ? (total_predicate_in_slots + sve_vector_size_in_slots * i) :
242 (FloatRegister::slots_per_neon_register * i);
243 } else {
244 sp_offset = FloatRegister::save_slots_per_register * i;
245 }
246 oop_map->set_callee_saved(VMRegImpl::stack2reg(sp_offset), r->as_VMReg());
247 }
248
249 return oop_map;
250 }
251
252 void RegisterSaver::restore_live_registers(MacroAssembler* masm) {
253 #ifdef COMPILER2
254 __ pop_CPU_state(_save_vectors, Matcher::supports_scalable_vector(),
255 Matcher::scalable_vector_reg_size(T_BYTE), total_sve_predicate_in_bytes());
256 #else
257 #if !INCLUDE_JVMCI
258 assert(!_save_vectors, "vectors are generated only by C2 and JVMCI");
259 #endif
260 __ pop_CPU_state(_save_vectors);
261 #endif
262 __ ldp(rfp, lr, Address(__ post(sp, 2 * wordSize)));
263 __ authenticate_return_address();
264 }
265
266 // Is vector's size (in bytes) bigger than a size saved by default?
267 // 8 bytes vector registers are saved by default on AArch64.
268 // The SVE supported min vector size is 8 bytes and we need to save
269 // predicate registers when the vector size is 8 bytes as well.
270 bool SharedRuntime::is_wide_vector(int size) {
271 return size > 8 || (UseSVE > 0 && size >= 8);
272 }
273
274 // ---------------------------------------------------------------------------
275 // Read the array of BasicTypes from a signature, and compute where the
276 // arguments should go. Values in the VMRegPair regs array refer to 4-byte
277 // quantities. Values less than VMRegImpl::stack0 are registers, those above
278 // refer to 4-byte stack slots. All stack slots are based off of the stack pointer
279 // as framesizes are fixed.
280 // VMRegImpl::stack0 refers to the first slot 0(sp).
281 // and VMRegImpl::stack0+1 refers to the memory word 4-byes higher.
282 // Register up to Register::number_of_registers are the 64-bit
283 // integer registers.
284
285 // Note: the INPUTS in sig_bt are in units of Java argument words,
286 // which are 64-bit. The OUTPUTS are in 32-bit units.
287
288 // The Java calling convention is a "shifted" version of the C ABI.
289 // By skipping the first C ABI register we can call non-static jni
290 // methods with small numbers of arguments without having to shuffle
291 // the arguments at all. Since we control the java ABI we ought to at
292 // least get some advantage out of it.
293
294 int SharedRuntime::java_calling_convention(const BasicType *sig_bt,
295 VMRegPair *regs,
296 int total_args_passed) {
297
298 // Create the mapping between argument positions and
299 // registers.
300 static const Register INT_ArgReg[Argument::n_int_register_parameters_j] = {
301 j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5, j_rarg6, j_rarg7
302 };
303 static const FloatRegister FP_ArgReg[Argument::n_float_register_parameters_j] = {
304 j_farg0, j_farg1, j_farg2, j_farg3,
305 j_farg4, j_farg5, j_farg6, j_farg7
306 };
307
308
309 uint int_args = 0;
310 uint fp_args = 0;
311 uint stk_args = 0;
312
313 for (int i = 0; i < total_args_passed; i++) {
314 switch (sig_bt[i]) {
315 case T_BOOLEAN:
316 case T_CHAR:
317 case T_BYTE:
318 case T_SHORT:
319 case T_INT:
320 if (int_args < Argument::n_int_register_parameters_j) {
321 regs[i].set1(INT_ArgReg[int_args++]->as_VMReg());
322 } else {
323 stk_args = align_up(stk_args, 2);
324 regs[i].set1(VMRegImpl::stack2reg(stk_args));
325 stk_args += 1;
326 }
327 break;
328 case T_VOID:
329 // halves of T_LONG or T_DOUBLE
330 assert(i != 0 && (sig_bt[i - 1] == T_LONG || sig_bt[i - 1] == T_DOUBLE), "expecting half");
331 regs[i].set_bad();
332 break;
333 case T_LONG:
334 assert((i + 1) < total_args_passed && sig_bt[i + 1] == T_VOID, "expecting half");
335 // fall through
336 case T_OBJECT:
337 case T_ARRAY:
338 case T_ADDRESS:
339 if (int_args < Argument::n_int_register_parameters_j) {
340 regs[i].set2(INT_ArgReg[int_args++]->as_VMReg());
341 } else {
342 stk_args = align_up(stk_args, 2);
343 regs[i].set2(VMRegImpl::stack2reg(stk_args));
344 stk_args += 2;
345 }
346 break;
347 case T_FLOAT:
348 if (fp_args < Argument::n_float_register_parameters_j) {
349 regs[i].set1(FP_ArgReg[fp_args++]->as_VMReg());
350 } else {
351 stk_args = align_up(stk_args, 2);
352 regs[i].set1(VMRegImpl::stack2reg(stk_args));
353 stk_args += 1;
354 }
355 break;
356 case T_DOUBLE:
357 assert((i + 1) < total_args_passed && sig_bt[i + 1] == T_VOID, "expecting half");
358 if (fp_args < Argument::n_float_register_parameters_j) {
359 regs[i].set2(FP_ArgReg[fp_args++]->as_VMReg());
360 } else {
361 stk_args = align_up(stk_args, 2);
362 regs[i].set2(VMRegImpl::stack2reg(stk_args));
363 stk_args += 2;
364 }
365 break;
366 default:
367 ShouldNotReachHere();
368 break;
369 }
370 }
371
372 return stk_args;
373 }
374
375 // Patch the callers callsite with entry to compiled code if it exists.
376 static void patch_callers_callsite(MacroAssembler *masm) {
377 Label L;
378 __ ldr(rscratch1, Address(rmethod, in_bytes(Method::code_offset())));
379 __ cbz(rscratch1, L);
380
381 __ enter();
382 __ push_CPU_state();
383
384 // VM needs caller's callsite
385 // VM needs target method
386 // This needs to be a long call since we will relocate this adapter to
387 // the codeBuffer and it may not reach
388
389 #ifndef PRODUCT
390 assert(frame::arg_reg_save_area_bytes == 0, "not expecting frame reg save area");
391 #endif
392
393 __ mov(c_rarg0, rmethod);
394 __ mov(c_rarg1, lr);
395 __ authenticate_return_address(c_rarg1);
396 __ lea(rscratch1, RuntimeAddress(CAST_FROM_FN_PTR(address, SharedRuntime::fixup_callers_callsite)));
397 __ blr(rscratch1);
398
399 // Explicit isb required because fixup_callers_callsite may change the code
400 // stream.
401 __ safepoint_isb();
402
403 __ pop_CPU_state();
404 // restore sp
405 __ leave();
406 __ bind(L);
407 }
408
409 static void gen_c2i_adapter(MacroAssembler *masm,
410 int total_args_passed,
411 int comp_args_on_stack,
412 const BasicType *sig_bt,
413 const VMRegPair *regs,
414 Label& skip_fixup) {
415 // Before we get into the guts of the C2I adapter, see if we should be here
416 // at all. We've come from compiled code and are attempting to jump to the
417 // interpreter, which means the caller made a static call to get here
418 // (vcalls always get a compiled target if there is one). Check for a
419 // compiled target. If there is one, we need to patch the caller's call.
420 patch_callers_callsite(masm);
421
422 __ bind(skip_fixup);
423
424 int words_pushed = 0;
425
426 // Since all args are passed on the stack, total_args_passed *
427 // Interpreter::stackElementSize is the space we need.
428
429 int extraspace = total_args_passed * Interpreter::stackElementSize;
430
431 __ mov(r19_sender_sp, sp);
432
433 // stack is aligned, keep it that way
434 extraspace = align_up(extraspace, 2*wordSize);
435
436 if (extraspace)
437 __ sub(sp, sp, extraspace);
438
439 // Now write the args into the outgoing interpreter space
440 for (int i = 0; i < total_args_passed; i++) {
441 if (sig_bt[i] == T_VOID) {
442 assert(i > 0 && (sig_bt[i-1] == T_LONG || sig_bt[i-1] == T_DOUBLE), "missing half");
443 continue;
444 }
445
446 // offset to start parameters
447 int st_off = (total_args_passed - i - 1) * Interpreter::stackElementSize;
448 int next_off = st_off - Interpreter::stackElementSize;
449
450 // Say 4 args:
451 // i st_off
452 // 0 32 T_LONG
453 // 1 24 T_VOID
454 // 2 16 T_OBJECT
455 // 3 8 T_BOOL
456 // - 0 return address
457 //
458 // However to make thing extra confusing. Because we can fit a Java long/double in
459 // a single slot on a 64 bt vm and it would be silly to break them up, the interpreter
460 // leaves one slot empty and only stores to a single slot. In this case the
461 // slot that is occupied is the T_VOID slot. See I said it was confusing.
462
463 VMReg r_1 = regs[i].first();
464 VMReg r_2 = regs[i].second();
465 if (!r_1->is_valid()) {
466 assert(!r_2->is_valid(), "");
467 continue;
468 }
469 if (r_1->is_stack()) {
470 // memory to memory use rscratch1
471 int ld_off = (r_1->reg2stack() * VMRegImpl::stack_slot_size
472 + extraspace
473 + words_pushed * wordSize);
474 if (!r_2->is_valid()) {
475 // sign extend??
476 __ ldrw(rscratch1, Address(sp, ld_off));
477 __ str(rscratch1, Address(sp, st_off));
478
479 } else {
480
481 __ ldr(rscratch1, Address(sp, ld_off));
482
483 // Two VMREgs|OptoRegs can be T_OBJECT, T_ADDRESS, T_DOUBLE, T_LONG
484 // T_DOUBLE and T_LONG use two slots in the interpreter
485 if ( sig_bt[i] == T_LONG || sig_bt[i] == T_DOUBLE) {
486 // ld_off == LSW, ld_off+wordSize == MSW
487 // st_off == MSW, next_off == LSW
488 __ str(rscratch1, Address(sp, next_off));
489 #ifdef ASSERT
490 // Overwrite the unused slot with known junk
491 __ mov(rscratch1, (uint64_t)0xdeadffffdeadaaaaull);
492 __ str(rscratch1, Address(sp, st_off));
493 #endif /* ASSERT */
494 } else {
495 __ str(rscratch1, Address(sp, st_off));
496 }
497 }
498 } else if (r_1->is_Register()) {
499 Register r = r_1->as_Register();
500 if (!r_2->is_valid()) {
501 // must be only an int (or less ) so move only 32bits to slot
502 // why not sign extend??
503 __ str(r, Address(sp, st_off));
504 } else {
505 // Two VMREgs|OptoRegs can be T_OBJECT, T_ADDRESS, T_DOUBLE, T_LONG
506 // T_DOUBLE and T_LONG use two slots in the interpreter
507 if ( sig_bt[i] == T_LONG || sig_bt[i] == T_DOUBLE) {
508 // jlong/double in gpr
509 #ifdef ASSERT
510 // Overwrite the unused slot with known junk
511 __ mov(rscratch1, (uint64_t)0xdeadffffdeadaaabull);
512 __ str(rscratch1, Address(sp, st_off));
513 #endif /* ASSERT */
514 __ str(r, Address(sp, next_off));
515 } else {
516 __ str(r, Address(sp, st_off));
517 }
518 }
519 } else {
520 assert(r_1->is_FloatRegister(), "");
521 if (!r_2->is_valid()) {
522 // only a float use just part of the slot
523 __ strs(r_1->as_FloatRegister(), Address(sp, st_off));
524 } else {
525 #ifdef ASSERT
526 // Overwrite the unused slot with known junk
527 __ mov(rscratch1, (uint64_t)0xdeadffffdeadaaacull);
528 __ str(rscratch1, Address(sp, st_off));
529 #endif /* ASSERT */
530 __ strd(r_1->as_FloatRegister(), Address(sp, next_off));
531 }
532 }
533 }
534
535 __ mov(esp, sp); // Interp expects args on caller's expression stack
536
537 __ ldr(rscratch1, Address(rmethod, in_bytes(Method::interpreter_entry_offset())));
538 __ br(rscratch1);
539 }
540
541
542 void SharedRuntime::gen_i2c_adapter(MacroAssembler *masm,
543 int total_args_passed,
544 int comp_args_on_stack,
545 const BasicType *sig_bt,
546 const VMRegPair *regs) {
547
548 // Note: r19_sender_sp contains the senderSP on entry. We must
549 // preserve it since we may do a i2c -> c2i transition if we lose a
550 // race where compiled code goes non-entrant while we get args
551 // ready.
552
553 // Adapters are frameless.
554
555 // An i2c adapter is frameless because the *caller* frame, which is
556 // interpreted, routinely repairs its own esp (from
557 // interpreter_frame_last_sp), even if a callee has modified the
558 // stack pointer. It also recalculates and aligns sp.
559
560 // A c2i adapter is frameless because the *callee* frame, which is
561 // interpreted, routinely repairs its caller's sp (from sender_sp,
562 // which is set up via the senderSP register).
563
564 // In other words, if *either* the caller or callee is interpreted, we can
565 // get the stack pointer repaired after a call.
566
567 // This is why c2i and i2c adapters cannot be indefinitely composed.
568 // In particular, if a c2i adapter were to somehow call an i2c adapter,
569 // both caller and callee would be compiled methods, and neither would
570 // clean up the stack pointer changes performed by the two adapters.
571 // If this happens, control eventually transfers back to the compiled
572 // caller, but with an uncorrected stack, causing delayed havoc.
573
574 if (VerifyAdapterCalls &&
575 (Interpreter::code() != nullptr || StubRoutines::final_stubs_code() != nullptr)) {
576 #if 0
577 // So, let's test for cascading c2i/i2c adapters right now.
578 // assert(Interpreter::contains($return_addr) ||
579 // StubRoutines::contains($return_addr),
580 // "i2c adapter must return to an interpreter frame");
581 __ block_comment("verify_i2c { ");
582 Label L_ok;
583 if (Interpreter::code() != nullptr) {
584 range_check(masm, rax, r11,
585 Interpreter::code()->code_start(), Interpreter::code()->code_end(),
586 L_ok);
587 }
588 if (StubRoutines::initial_stubs_code() != nullptr) {
589 range_check(masm, rax, r11,
590 StubRoutines::initial_stubs_code()->code_begin(),
591 StubRoutines::initial_stubs_code()->code_end(),
592 L_ok);
593 }
594 if (StubRoutines::final_stubs_code() != nullptr) {
595 range_check(masm, rax, r11,
596 StubRoutines::final_stubs_code()->code_begin(),
597 StubRoutines::final_stubs_code()->code_end(),
598 L_ok);
599 }
600 const char* msg = "i2c adapter must return to an interpreter frame";
601 __ block_comment(msg);
602 __ stop(msg);
603 __ bind(L_ok);
604 __ block_comment("} verify_i2ce ");
605 #endif
606 }
607
608 // Cut-out for having no stack args.
609 int comp_words_on_stack = align_up(comp_args_on_stack*VMRegImpl::stack_slot_size, wordSize)>>LogBytesPerWord;
610 if (comp_args_on_stack) {
611 __ sub(rscratch1, sp, comp_words_on_stack * wordSize);
612 __ andr(sp, rscratch1, -16);
613 }
614
615 // Will jump to the compiled code just as if compiled code was doing it.
616 // Pre-load the register-jump target early, to schedule it better.
617 __ ldr(rscratch1, Address(rmethod, in_bytes(Method::from_compiled_offset())));
618
619 #if INCLUDE_JVMCI
620 if (EnableJVMCI) {
621 // check if this call should be routed towards a specific entry point
622 __ ldr(rscratch2, Address(rthread, in_bytes(JavaThread::jvmci_alternate_call_target_offset())));
623 Label no_alternative_target;
624 __ cbz(rscratch2, no_alternative_target);
625 __ mov(rscratch1, rscratch2);
626 __ str(zr, Address(rthread, in_bytes(JavaThread::jvmci_alternate_call_target_offset())));
627 __ bind(no_alternative_target);
628 }
629 #endif // INCLUDE_JVMCI
630
631 // Now generate the shuffle code.
632 for (int i = 0; i < total_args_passed; i++) {
633 if (sig_bt[i] == T_VOID) {
634 assert(i > 0 && (sig_bt[i-1] == T_LONG || sig_bt[i-1] == T_DOUBLE), "missing half");
635 continue;
636 }
637
638 // Pick up 0, 1 or 2 words from SP+offset.
639
640 assert(!regs[i].second()->is_valid() || regs[i].first()->next() == regs[i].second(),
641 "scrambled load targets?");
642 // Load in argument order going down.
643 int ld_off = (total_args_passed - i - 1)*Interpreter::stackElementSize;
644 // Point to interpreter value (vs. tag)
645 int next_off = ld_off - Interpreter::stackElementSize;
646 //
647 //
648 //
649 VMReg r_1 = regs[i].first();
650 VMReg r_2 = regs[i].second();
651 if (!r_1->is_valid()) {
652 assert(!r_2->is_valid(), "");
653 continue;
654 }
655 if (r_1->is_stack()) {
656 // Convert stack slot to an SP offset (+ wordSize to account for return address )
657 int st_off = regs[i].first()->reg2stack()*VMRegImpl::stack_slot_size;
658 if (!r_2->is_valid()) {
659 // sign extend???
660 __ ldrsw(rscratch2, Address(esp, ld_off));
661 __ str(rscratch2, Address(sp, st_off));
662 } else {
663 //
664 // We are using two optoregs. This can be either T_OBJECT,
665 // T_ADDRESS, T_LONG, or T_DOUBLE the interpreter allocates
666 // two slots but only uses one for thr T_LONG or T_DOUBLE case
667 // So we must adjust where to pick up the data to match the
668 // interpreter.
669 //
670 // Interpreter local[n] == MSW, local[n+1] == LSW however locals
671 // are accessed as negative so LSW is at LOW address
672
673 // ld_off is MSW so get LSW
674 const int offset = (sig_bt[i]==T_LONG||sig_bt[i]==T_DOUBLE)?
675 next_off : ld_off;
676 __ ldr(rscratch2, Address(esp, offset));
677 // st_off is LSW (i.e. reg.first())
678 __ str(rscratch2, Address(sp, st_off));
679 }
680 } else if (r_1->is_Register()) { // Register argument
681 Register r = r_1->as_Register();
682 if (r_2->is_valid()) {
683 //
684 // We are using two VMRegs. This can be either T_OBJECT,
685 // T_ADDRESS, T_LONG, or T_DOUBLE the interpreter allocates
686 // two slots but only uses one for thr T_LONG or T_DOUBLE case
687 // So we must adjust where to pick up the data to match the
688 // interpreter.
689
690 const int offset = (sig_bt[i]==T_LONG||sig_bt[i]==T_DOUBLE)?
691 next_off : ld_off;
692
693 // this can be a misaligned move
694 __ ldr(r, Address(esp, offset));
695 } else {
696 // sign extend and use a full word?
697 __ ldrw(r, Address(esp, ld_off));
698 }
699 } else {
700 if (!r_2->is_valid()) {
701 __ ldrs(r_1->as_FloatRegister(), Address(esp, ld_off));
702 } else {
703 __ ldrd(r_1->as_FloatRegister(), Address(esp, next_off));
704 }
705 }
706 }
707
708 __ mov(rscratch2, rscratch1);
709 __ push_cont_fastpath(rthread); // Set JavaThread::_cont_fastpath to the sp of the oldest interpreted frame we know about; kills rscratch1
710 __ mov(rscratch1, rscratch2);
711
712 // 6243940 We might end up in handle_wrong_method if
713 // the callee is deoptimized as we race thru here. If that
714 // happens we don't want to take a safepoint because the
715 // caller frame will look interpreted and arguments are now
716 // "compiled" so it is much better to make this transition
717 // invisible to the stack walking code. Unfortunately if
718 // we try and find the callee by normal means a safepoint
719 // is possible. So we stash the desired callee in the thread
720 // and the vm will find there should this case occur.
721
722 __ str(rmethod, Address(rthread, JavaThread::callee_target_offset()));
723
724 __ br(rscratch1);
725 }
726
727 // ---------------------------------------------------------------
728 AdapterHandlerEntry* SharedRuntime::generate_i2c2i_adapters(MacroAssembler *masm,
729 int total_args_passed,
730 int comp_args_on_stack,
731 const BasicType *sig_bt,
732 const VMRegPair *regs,
733 AdapterFingerPrint* fingerprint) {
734 address i2c_entry = __ pc();
735
736 gen_i2c_adapter(masm, total_args_passed, comp_args_on_stack, sig_bt, regs);
737
738 address c2i_unverified_entry = __ pc();
739 Label skip_fixup;
740
741 Register data = rscratch2;
742 Register receiver = j_rarg0;
743 Register tmp = r10; // A call-clobbered register not used for arg passing
744
745 // -------------------------------------------------------------------------
746 // Generate a C2I adapter. On entry we know rmethod holds the Method* during calls
747 // to the interpreter. The args start out packed in the compiled layout. They
748 // need to be unpacked into the interpreter layout. This will almost always
749 // require some stack space. We grow the current (compiled) stack, then repack
750 // the args. We finally end in a jump to the generic interpreter entry point.
751 // On exit from the interpreter, the interpreter will restore our SP (lest the
752 // compiled code, which relies solely on SP and not FP, get sick).
753
754 {
755 __ block_comment("c2i_unverified_entry {");
756 // Method might have been compiled since the call site was patched to
757 // interpreted; if that is the case treat it as a miss so we can get
758 // the call site corrected.
759 __ ic_check(1 /* end_alignment */);
760 __ ldr(rmethod, Address(data, CompiledICData::speculated_method_offset()));
761
762 __ ldr(rscratch1, Address(rmethod, in_bytes(Method::code_offset())));
763 __ cbz(rscratch1, skip_fixup);
764 __ far_jump(RuntimeAddress(SharedRuntime::get_ic_miss_stub()));
765 __ block_comment("} c2i_unverified_entry");
766 }
767
768 address c2i_entry = __ pc();
769
770 // Class initialization barrier for static methods
771 address c2i_no_clinit_check_entry = nullptr;
772 if (VM_Version::supports_fast_class_init_checks()) {
773 Label L_skip_barrier;
774
775 { // Bypass the barrier for non-static methods
776 __ ldrw(rscratch1, Address(rmethod, Method::access_flags_offset()));
777 __ andsw(zr, rscratch1, JVM_ACC_STATIC);
778 __ br(Assembler::EQ, L_skip_barrier); // non-static
779 }
780
781 __ load_method_holder(rscratch2, rmethod);
782 __ clinit_barrier(rscratch2, rscratch1, &L_skip_barrier);
783 __ far_jump(RuntimeAddress(SharedRuntime::get_handle_wrong_method_stub()));
784
785 __ bind(L_skip_barrier);
786 c2i_no_clinit_check_entry = __ pc();
787 }
788
789 BarrierSetAssembler* bs = BarrierSet::barrier_set()->barrier_set_assembler();
790 bs->c2i_entry_barrier(masm);
791
792 gen_c2i_adapter(masm, total_args_passed, comp_args_on_stack, sig_bt, regs, skip_fixup);
793
794 return AdapterHandlerLibrary::new_entry(fingerprint, i2c_entry, c2i_entry, c2i_unverified_entry, c2i_no_clinit_check_entry);
795 }
796
797 static int c_calling_convention_priv(const BasicType *sig_bt,
798 VMRegPair *regs,
799 int total_args_passed) {
800
801 // We return the amount of VMRegImpl stack slots we need to reserve for all
802 // the arguments NOT counting out_preserve_stack_slots.
803
804 static const Register INT_ArgReg[Argument::n_int_register_parameters_c] = {
805 c_rarg0, c_rarg1, c_rarg2, c_rarg3, c_rarg4, c_rarg5, c_rarg6, c_rarg7
806 };
807 static const FloatRegister FP_ArgReg[Argument::n_float_register_parameters_c] = {
808 c_farg0, c_farg1, c_farg2, c_farg3,
809 c_farg4, c_farg5, c_farg6, c_farg7
810 };
811
812 uint int_args = 0;
813 uint fp_args = 0;
814 uint stk_args = 0; // inc by 2 each time
815
816 for (int i = 0; i < total_args_passed; i++) {
817 switch (sig_bt[i]) {
818 case T_BOOLEAN:
819 case T_CHAR:
820 case T_BYTE:
821 case T_SHORT:
822 case T_INT:
823 if (int_args < Argument::n_int_register_parameters_c) {
824 regs[i].set1(INT_ArgReg[int_args++]->as_VMReg());
825 } else {
826 #ifdef __APPLE__
827 // Less-than word types are stored one after another.
828 // The code is unable to handle this so bailout.
829 return -1;
830 #endif
831 regs[i].set1(VMRegImpl::stack2reg(stk_args));
832 stk_args += 2;
833 }
834 break;
835 case T_LONG:
836 assert((i + 1) < total_args_passed && sig_bt[i + 1] == T_VOID, "expecting half");
837 // fall through
838 case T_OBJECT:
839 case T_ARRAY:
840 case T_ADDRESS:
841 case T_METADATA:
842 if (int_args < Argument::n_int_register_parameters_c) {
843 regs[i].set2(INT_ArgReg[int_args++]->as_VMReg());
844 } else {
845 regs[i].set2(VMRegImpl::stack2reg(stk_args));
846 stk_args += 2;
847 }
848 break;
849 case T_FLOAT:
850 if (fp_args < Argument::n_float_register_parameters_c) {
851 regs[i].set1(FP_ArgReg[fp_args++]->as_VMReg());
852 } else {
853 #ifdef __APPLE__
854 // Less-than word types are stored one after another.
855 // The code is unable to handle this so bailout.
856 return -1;
857 #endif
858 regs[i].set1(VMRegImpl::stack2reg(stk_args));
859 stk_args += 2;
860 }
861 break;
862 case T_DOUBLE:
863 assert((i + 1) < total_args_passed && sig_bt[i + 1] == T_VOID, "expecting half");
864 if (fp_args < Argument::n_float_register_parameters_c) {
865 regs[i].set2(FP_ArgReg[fp_args++]->as_VMReg());
866 } else {
867 regs[i].set2(VMRegImpl::stack2reg(stk_args));
868 stk_args += 2;
869 }
870 break;
871 case T_VOID: // Halves of longs and doubles
872 assert(i != 0 && (sig_bt[i - 1] == T_LONG || sig_bt[i - 1] == T_DOUBLE), "expecting half");
873 regs[i].set_bad();
874 break;
875 default:
876 ShouldNotReachHere();
877 break;
878 }
879 }
880
881 return stk_args;
882 }
883
884 int SharedRuntime::vector_calling_convention(VMRegPair *regs,
885 uint num_bits,
886 uint total_args_passed) {
887 Unimplemented();
888 return 0;
889 }
890
891 int SharedRuntime::c_calling_convention(const BasicType *sig_bt,
892 VMRegPair *regs,
893 int total_args_passed)
894 {
895 int result = c_calling_convention_priv(sig_bt, regs, total_args_passed);
896 guarantee(result >= 0, "Unsupported arguments configuration");
897 return result;
898 }
899
900
901 void SharedRuntime::save_native_result(MacroAssembler *masm, BasicType ret_type, int frame_slots) {
902 // We always ignore the frame_slots arg and just use the space just below frame pointer
903 // which by this time is free to use
904 switch (ret_type) {
905 case T_FLOAT:
906 __ strs(v0, Address(rfp, -wordSize));
907 break;
908 case T_DOUBLE:
909 __ strd(v0, Address(rfp, -wordSize));
910 break;
911 case T_VOID: break;
912 default: {
913 __ str(r0, Address(rfp, -wordSize));
914 }
915 }
916 }
917
918 void SharedRuntime::restore_native_result(MacroAssembler *masm, BasicType ret_type, int frame_slots) {
919 // We always ignore the frame_slots arg and just use the space just below frame pointer
920 // which by this time is free to use
921 switch (ret_type) {
922 case T_FLOAT:
923 __ ldrs(v0, Address(rfp, -wordSize));
924 break;
925 case T_DOUBLE:
926 __ ldrd(v0, Address(rfp, -wordSize));
927 break;
928 case T_VOID: break;
929 default: {
930 __ ldr(r0, Address(rfp, -wordSize));
931 }
932 }
933 }
934 static void save_args(MacroAssembler *masm, int arg_count, int first_arg, VMRegPair *args) {
935 RegSet x;
936 for ( int i = first_arg ; i < arg_count ; i++ ) {
937 if (args[i].first()->is_Register()) {
938 x = x + args[i].first()->as_Register();
939 } else if (args[i].first()->is_FloatRegister()) {
940 __ strd(args[i].first()->as_FloatRegister(), Address(__ pre(sp, -2 * wordSize)));
941 }
942 }
943 __ push(x, sp);
944 }
945
946 static void restore_args(MacroAssembler *masm, int arg_count, int first_arg, VMRegPair *args) {
947 RegSet x;
948 for ( int i = first_arg ; i < arg_count ; i++ ) {
949 if (args[i].first()->is_Register()) {
950 x = x + args[i].first()->as_Register();
951 } else {
952 ;
953 }
954 }
955 __ pop(x, sp);
956 for ( int i = arg_count - 1 ; i >= first_arg ; i-- ) {
957 if (args[i].first()->is_Register()) {
958 ;
959 } else if (args[i].first()->is_FloatRegister()) {
960 __ ldrd(args[i].first()->as_FloatRegister(), Address(__ post(sp, 2 * wordSize)));
961 }
962 }
963 }
964
965 static void verify_oop_args(MacroAssembler* masm,
966 const methodHandle& method,
967 const BasicType* sig_bt,
968 const VMRegPair* regs) {
969 Register temp_reg = r19; // not part of any compiled calling seq
970 if (VerifyOops) {
971 for (int i = 0; i < method->size_of_parameters(); i++) {
972 if (sig_bt[i] == T_OBJECT ||
973 sig_bt[i] == T_ARRAY) {
974 VMReg r = regs[i].first();
975 assert(r->is_valid(), "bad oop arg");
976 if (r->is_stack()) {
977 __ ldr(temp_reg, Address(sp, r->reg2stack() * VMRegImpl::stack_slot_size));
978 __ verify_oop(temp_reg);
979 } else {
980 __ verify_oop(r->as_Register());
981 }
982 }
983 }
984 }
985 }
986
987 // on exit, sp points to the ContinuationEntry
988 static OopMap* continuation_enter_setup(MacroAssembler* masm, int& stack_slots) {
989 assert(ContinuationEntry::size() % VMRegImpl::stack_slot_size == 0, "");
990 assert(in_bytes(ContinuationEntry::cont_offset()) % VMRegImpl::stack_slot_size == 0, "");
991 assert(in_bytes(ContinuationEntry::chunk_offset()) % VMRegImpl::stack_slot_size == 0, "");
992
993 stack_slots += (int)ContinuationEntry::size()/wordSize;
994 __ sub(sp, sp, (int)ContinuationEntry::size()); // place Continuation metadata
995
996 OopMap* map = new OopMap(((int)ContinuationEntry::size() + wordSize)/ VMRegImpl::stack_slot_size, 0 /* arg_slots*/);
997
998 __ ldr(rscratch1, Address(rthread, JavaThread::cont_entry_offset()));
999 __ str(rscratch1, Address(sp, ContinuationEntry::parent_offset()));
1000 __ mov(rscratch1, sp); // we can't use sp as the source in str
1001 __ str(rscratch1, Address(rthread, JavaThread::cont_entry_offset()));
1002
1003 return map;
1004 }
1005
1006 // on entry c_rarg1 points to the continuation
1007 // sp points to ContinuationEntry
1008 // c_rarg3 -- isVirtualThread
1009 static void fill_continuation_entry(MacroAssembler* masm) {
1010 #ifdef ASSERT
1011 __ movw(rscratch1, ContinuationEntry::cookie_value());
1012 __ strw(rscratch1, Address(sp, ContinuationEntry::cookie_offset()));
1013 #endif
1014
1015 __ str (c_rarg1, Address(sp, ContinuationEntry::cont_offset()));
1016 __ strw(c_rarg3, Address(sp, ContinuationEntry::flags_offset()));
1017 __ str (zr, Address(sp, ContinuationEntry::chunk_offset()));
1018 __ strw(zr, Address(sp, ContinuationEntry::argsize_offset()));
1019 __ strw(zr, Address(sp, ContinuationEntry::pin_count_offset()));
1020
1021 __ ldr(rscratch1, Address(rthread, JavaThread::cont_fastpath_offset()));
1022 __ str(rscratch1, Address(sp, ContinuationEntry::parent_cont_fastpath_offset()));
1023 __ ldr(rscratch1, Address(rthread, JavaThread::held_monitor_count_offset()));
1024 __ str(rscratch1, Address(sp, ContinuationEntry::parent_held_monitor_count_offset()));
1025
1026 __ str(zr, Address(rthread, JavaThread::cont_fastpath_offset()));
1027 __ str(zr, Address(rthread, JavaThread::held_monitor_count_offset()));
1028 }
1029
1030 // on entry, sp points to the ContinuationEntry
1031 // on exit, rfp points to the spilled rfp in the entry frame
1032 static void continuation_enter_cleanup(MacroAssembler* masm) {
1033 #ifndef PRODUCT
1034 Label OK;
1035 __ ldr(rscratch1, Address(rthread, JavaThread::cont_entry_offset()));
1036 __ cmp(sp, rscratch1);
1037 __ br(Assembler::EQ, OK);
1038 __ stop("incorrect sp1");
1039 __ bind(OK);
1040 #endif
1041 __ ldr(rscratch1, Address(sp, ContinuationEntry::parent_cont_fastpath_offset()));
1042 __ str(rscratch1, Address(rthread, JavaThread::cont_fastpath_offset()));
1043
1044 if (CheckJNICalls) {
1045 // Check if this is a virtual thread continuation
1046 Label L_skip_vthread_code;
1047 __ ldrw(rscratch1, Address(sp, ContinuationEntry::flags_offset()));
1048 __ cbzw(rscratch1, L_skip_vthread_code);
1049
1050 // If the held monitor count is > 0 and this vthread is terminating then
1051 // it failed to release a JNI monitor. So we issue the same log message
1052 // that JavaThread::exit does.
1053 __ ldr(rscratch1, Address(rthread, JavaThread::jni_monitor_count_offset()));
1054 __ cbz(rscratch1, L_skip_vthread_code);
1055
1056 // Save return value potentially containing the exception oop in callee-saved R19.
1057 __ mov(r19, r0);
1058 __ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::log_jni_monitor_still_held));
1059 // Restore potential return value.
1060 __ mov(r0, r19);
1061
1062 // For vthreads we have to explicitly zero the JNI monitor count of the carrier
1063 // on termination. The held count is implicitly zeroed below when we restore from
1064 // the parent held count (which has to be zero).
1065 __ str(zr, Address(rthread, JavaThread::jni_monitor_count_offset()));
1066
1067 __ bind(L_skip_vthread_code);
1068 }
1069 #ifdef ASSERT
1070 else {
1071 // Check if this is a virtual thread continuation
1072 Label L_skip_vthread_code;
1073 __ ldrw(rscratch1, Address(sp, ContinuationEntry::flags_offset()));
1074 __ cbzw(rscratch1, L_skip_vthread_code);
1075
1076 // See comment just above. If not checking JNI calls the JNI count is only
1077 // needed for assertion checking.
1078 __ str(zr, Address(rthread, JavaThread::jni_monitor_count_offset()));
1079
1080 __ bind(L_skip_vthread_code);
1081 }
1082 #endif
1083
1084 __ ldr(rscratch1, Address(sp, ContinuationEntry::parent_held_monitor_count_offset()));
1085 __ str(rscratch1, Address(rthread, JavaThread::held_monitor_count_offset()));
1086
1087 __ ldr(rscratch2, Address(sp, ContinuationEntry::parent_offset()));
1088 __ str(rscratch2, Address(rthread, JavaThread::cont_entry_offset()));
1089 __ add(rfp, sp, (int)ContinuationEntry::size());
1090 }
1091
1092 // enterSpecial(Continuation c, boolean isContinue, boolean isVirtualThread)
1093 // On entry: c_rarg1 -- the continuation object
1094 // c_rarg2 -- isContinue
1095 // c_rarg3 -- isVirtualThread
1096 static void gen_continuation_enter(MacroAssembler* masm,
1097 const methodHandle& method,
1098 const BasicType* sig_bt,
1099 const VMRegPair* regs,
1100 int& exception_offset,
1101 OopMapSet*oop_maps,
1102 int& frame_complete,
1103 int& stack_slots,
1104 int& interpreted_entry_offset,
1105 int& compiled_entry_offset) {
1106 //verify_oop_args(masm, method, sig_bt, regs);
1107 Address resolve(SharedRuntime::get_resolve_static_call_stub(), relocInfo::static_call_type);
1108
1109 address start = __ pc();
1110
1111 Label call_thaw, exit;
1112
1113 // i2i entry used at interp_only_mode only
1114 interpreted_entry_offset = __ pc() - start;
1115 {
1116
1117 #ifdef ASSERT
1118 Label is_interp_only;
1119 __ ldrw(rscratch1, Address(rthread, JavaThread::interp_only_mode_offset()));
1120 __ cbnzw(rscratch1, is_interp_only);
1121 __ stop("enterSpecial interpreter entry called when not in interp_only_mode");
1122 __ bind(is_interp_only);
1123 #endif
1124
1125 // Read interpreter arguments into registers (this is an ad-hoc i2c adapter)
1126 __ ldr(c_rarg1, Address(esp, Interpreter::stackElementSize*2));
1127 __ ldr(c_rarg2, Address(esp, Interpreter::stackElementSize*1));
1128 __ ldr(c_rarg3, Address(esp, Interpreter::stackElementSize*0));
1129 __ push_cont_fastpath(rthread);
1130
1131 __ enter();
1132 stack_slots = 2; // will be adjusted in setup
1133 OopMap* map = continuation_enter_setup(masm, stack_slots);
1134 // The frame is complete here, but we only record it for the compiled entry, so the frame would appear unsafe,
1135 // but that's okay because at the very worst we'll miss an async sample, but we're in interp_only_mode anyway.
1136
1137 fill_continuation_entry(masm);
1138
1139 __ cbnz(c_rarg2, call_thaw);
1140
1141 const address tr_call = __ trampoline_call(resolve);
1142 if (tr_call == nullptr) {
1143 fatal("CodeCache is full at gen_continuation_enter");
1144 }
1145
1146 oop_maps->add_gc_map(__ pc() - start, map);
1147 __ post_call_nop();
1148
1149 __ b(exit);
1150
1151 address stub = CompiledDirectCall::emit_to_interp_stub(masm, tr_call);
1152 if (stub == nullptr) {
1153 fatal("CodeCache is full at gen_continuation_enter");
1154 }
1155 }
1156
1157 // compiled entry
1158 __ align(CodeEntryAlignment);
1159 compiled_entry_offset = __ pc() - start;
1160
1161 __ enter();
1162 stack_slots = 2; // will be adjusted in setup
1163 OopMap* map = continuation_enter_setup(masm, stack_slots);
1164 frame_complete = __ pc() - start;
1165
1166 fill_continuation_entry(masm);
1167
1168 __ cbnz(c_rarg2, call_thaw);
1169
1170 const address tr_call = __ trampoline_call(resolve);
1171 if (tr_call == nullptr) {
1172 fatal("CodeCache is full at gen_continuation_enter");
1173 }
1174
1175 oop_maps->add_gc_map(__ pc() - start, map);
1176 __ post_call_nop();
1177
1178 __ b(exit);
1179
1180 __ bind(call_thaw);
1181
1182 __ rt_call(CAST_FROM_FN_PTR(address, StubRoutines::cont_thaw()));
1183 oop_maps->add_gc_map(__ pc() - start, map->deep_copy());
1184 ContinuationEntry::_return_pc_offset = __ pc() - start;
1185 __ post_call_nop();
1186
1187 __ bind(exit);
1188 continuation_enter_cleanup(masm);
1189 __ leave();
1190 __ ret(lr);
1191
1192 /// exception handling
1193
1194 exception_offset = __ pc() - start;
1195 {
1196 __ mov(r19, r0); // save return value contaning the exception oop in callee-saved R19
1197
1198 continuation_enter_cleanup(masm);
1199
1200 __ ldr(c_rarg1, Address(rfp, wordSize)); // return address
1201 __ authenticate_return_address(c_rarg1);
1202 __ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::exception_handler_for_return_address), rthread, c_rarg1);
1203
1204 // see OptoRuntime::generate_exception_blob: r0 -- exception oop, r3 -- exception pc
1205
1206 __ mov(r1, r0); // the exception handler
1207 __ mov(r0, r19); // restore return value contaning the exception oop
1208 __ verify_oop(r0);
1209
1210 __ leave();
1211 __ mov(r3, lr);
1212 __ br(r1); // the exception handler
1213 }
1214
1215 address stub = CompiledDirectCall::emit_to_interp_stub(masm, tr_call);
1216 if (stub == nullptr) {
1217 fatal("CodeCache is full at gen_continuation_enter");
1218 }
1219 }
1220
1221 static void gen_continuation_yield(MacroAssembler* masm,
1222 const methodHandle& method,
1223 const BasicType* sig_bt,
1224 const VMRegPair* regs,
1225 OopMapSet* oop_maps,
1226 int& frame_complete,
1227 int& stack_slots,
1228 int& compiled_entry_offset) {
1229 enum layout {
1230 rfp_off1,
1231 rfp_off2,
1232 lr_off,
1233 lr_off2,
1234 framesize // inclusive of return address
1235 };
1236 // assert(is_even(framesize/2), "sp not 16-byte aligned");
1237 stack_slots = framesize / VMRegImpl::slots_per_word;
1238 assert(stack_slots == 2, "recheck layout");
1239
1240 address start = __ pc();
1241
1242 compiled_entry_offset = __ pc() - start;
1243 __ enter();
1244
1245 __ mov(c_rarg1, sp);
1246
1247 frame_complete = __ pc() - start;
1248 address the_pc = __ pc();
1249
1250 __ 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
1251
1252 __ mov(c_rarg0, rthread);
1253 __ set_last_Java_frame(sp, rfp, the_pc, rscratch1);
1254 __ call_VM_leaf(Continuation::freeze_entry(), 2);
1255 __ reset_last_Java_frame(true);
1256
1257 Label pinned;
1258
1259 __ cbnz(r0, pinned);
1260
1261 // We've succeeded, set sp to the ContinuationEntry
1262 __ ldr(rscratch1, Address(rthread, JavaThread::cont_entry_offset()));
1263 __ mov(sp, rscratch1);
1264 continuation_enter_cleanup(masm);
1265
1266 __ bind(pinned); // pinned -- return to caller
1267
1268 // handle pending exception thrown by freeze
1269 __ ldr(rscratch1, Address(rthread, in_bytes(Thread::pending_exception_offset())));
1270 Label ok;
1271 __ cbz(rscratch1, ok);
1272 __ leave();
1273 __ lea(rscratch1, RuntimeAddress(StubRoutines::forward_exception_entry()));
1274 __ br(rscratch1);
1275 __ bind(ok);
1276
1277 __ leave();
1278 __ ret(lr);
1279
1280 OopMap* map = new OopMap(framesize, 1);
1281 oop_maps->add_gc_map(the_pc - start, map);
1282 }
1283
1284 static void gen_special_dispatch(MacroAssembler* masm,
1285 const methodHandle& method,
1286 const BasicType* sig_bt,
1287 const VMRegPair* regs) {
1288 verify_oop_args(masm, method, sig_bt, regs);
1289 vmIntrinsics::ID iid = method->intrinsic_id();
1290
1291 // Now write the args into the outgoing interpreter space
1292 bool has_receiver = false;
1293 Register receiver_reg = noreg;
1294 int member_arg_pos = -1;
1295 Register member_reg = noreg;
1296 int ref_kind = MethodHandles::signature_polymorphic_intrinsic_ref_kind(iid);
1297 if (ref_kind != 0) {
1298 member_arg_pos = method->size_of_parameters() - 1; // trailing MemberName argument
1299 member_reg = r19; // known to be free at this point
1300 has_receiver = MethodHandles::ref_kind_has_receiver(ref_kind);
1301 } else if (iid == vmIntrinsics::_invokeBasic) {
1302 has_receiver = true;
1303 } else if (iid == vmIntrinsics::_linkToNative) {
1304 member_arg_pos = method->size_of_parameters() - 1; // trailing NativeEntryPoint argument
1305 member_reg = r19; // known to be free at this point
1306 } else {
1307 fatal("unexpected intrinsic id %d", vmIntrinsics::as_int(iid));
1308 }
1309
1310 if (member_reg != noreg) {
1311 // Load the member_arg into register, if necessary.
1312 SharedRuntime::check_member_name_argument_is_last_argument(method, sig_bt, regs);
1313 VMReg r = regs[member_arg_pos].first();
1314 if (r->is_stack()) {
1315 __ ldr(member_reg, Address(sp, r->reg2stack() * VMRegImpl::stack_slot_size));
1316 } else {
1317 // no data motion is needed
1318 member_reg = r->as_Register();
1319 }
1320 }
1321
1322 if (has_receiver) {
1323 // Make sure the receiver is loaded into a register.
1324 assert(method->size_of_parameters() > 0, "oob");
1325 assert(sig_bt[0] == T_OBJECT, "receiver argument must be an object");
1326 VMReg r = regs[0].first();
1327 assert(r->is_valid(), "bad receiver arg");
1328 if (r->is_stack()) {
1329 // Porting note: This assumes that compiled calling conventions always
1330 // pass the receiver oop in a register. If this is not true on some
1331 // platform, pick a temp and load the receiver from stack.
1332 fatal("receiver always in a register");
1333 receiver_reg = r2; // known to be free at this point
1334 __ ldr(receiver_reg, Address(sp, r->reg2stack() * VMRegImpl::stack_slot_size));
1335 } else {
1336 // no data motion is needed
1337 receiver_reg = r->as_Register();
1338 }
1339 }
1340
1341 // Figure out which address we are really jumping to:
1342 MethodHandles::generate_method_handle_dispatch(masm, iid,
1343 receiver_reg, member_reg, /*for_compiler_entry:*/ true);
1344 }
1345
1346 // ---------------------------------------------------------------------------
1347 // Generate a native wrapper for a given method. The method takes arguments
1348 // in the Java compiled code convention, marshals them to the native
1349 // convention (handlizes oops, etc), transitions to native, makes the call,
1350 // returns to java state (possibly blocking), unhandlizes any result and
1351 // returns.
1352 //
1353 // Critical native functions are a shorthand for the use of
1354 // GetPrimtiveArrayCritical and disallow the use of any other JNI
1355 // functions. The wrapper is expected to unpack the arguments before
1356 // passing them to the callee. Critical native functions leave the state _in_Java,
1357 // since they block out GC.
1358 // Some other parts of JNI setup are skipped like the tear down of the JNI handle
1359 // block and the check for pending exceptions it's impossible for them
1360 // to be thrown.
1361 //
1362 nmethod* SharedRuntime::generate_native_wrapper(MacroAssembler* masm,
1363 const methodHandle& method,
1364 int compile_id,
1365 BasicType* in_sig_bt,
1366 VMRegPair* in_regs,
1367 BasicType ret_type) {
1368 if (method->is_continuation_native_intrinsic()) {
1369 int exception_offset = -1;
1370 OopMapSet* oop_maps = new OopMapSet();
1371 int frame_complete = -1;
1372 int stack_slots = -1;
1373 int interpreted_entry_offset = -1;
1374 int vep_offset = -1;
1375 if (method->is_continuation_enter_intrinsic()) {
1376 gen_continuation_enter(masm,
1377 method,
1378 in_sig_bt,
1379 in_regs,
1380 exception_offset,
1381 oop_maps,
1382 frame_complete,
1383 stack_slots,
1384 interpreted_entry_offset,
1385 vep_offset);
1386 } else if (method->is_continuation_yield_intrinsic()) {
1387 gen_continuation_yield(masm,
1388 method,
1389 in_sig_bt,
1390 in_regs,
1391 oop_maps,
1392 frame_complete,
1393 stack_slots,
1394 vep_offset);
1395 } else {
1396 guarantee(false, "Unknown Continuation native intrinsic");
1397 }
1398
1399 #ifdef ASSERT
1400 if (method->is_continuation_enter_intrinsic()) {
1401 assert(interpreted_entry_offset != -1, "Must be set");
1402 assert(exception_offset != -1, "Must be set");
1403 } else {
1404 assert(interpreted_entry_offset == -1, "Must be unset");
1405 assert(exception_offset == -1, "Must be unset");
1406 }
1407 assert(frame_complete != -1, "Must be set");
1408 assert(stack_slots != -1, "Must be set");
1409 assert(vep_offset != -1, "Must be set");
1410 #endif
1411
1412 __ flush();
1413 nmethod* nm = nmethod::new_native_nmethod(method,
1414 compile_id,
1415 masm->code(),
1416 vep_offset,
1417 frame_complete,
1418 stack_slots,
1419 in_ByteSize(-1),
1420 in_ByteSize(-1),
1421 oop_maps,
1422 exception_offset);
1423 if (nm == nullptr) return nm;
1424 if (method->is_continuation_enter_intrinsic()) {
1425 ContinuationEntry::set_enter_code(nm, interpreted_entry_offset);
1426 } else if (method->is_continuation_yield_intrinsic()) {
1427 _cont_doYield_stub = nm;
1428 } else {
1429 guarantee(false, "Unknown Continuation native intrinsic");
1430 }
1431 return nm;
1432 }
1433
1434 if (method->is_method_handle_intrinsic()) {
1435 vmIntrinsics::ID iid = method->intrinsic_id();
1436 intptr_t start = (intptr_t)__ pc();
1437 int vep_offset = ((intptr_t)__ pc()) - start;
1438
1439 // First instruction must be a nop as it may need to be patched on deoptimisation
1440 __ nop();
1441 gen_special_dispatch(masm,
1442 method,
1443 in_sig_bt,
1444 in_regs);
1445 int frame_complete = ((intptr_t)__ pc()) - start; // not complete, period
1446 __ flush();
1447 int stack_slots = SharedRuntime::out_preserve_stack_slots(); // no out slots at all, actually
1448 return nmethod::new_native_nmethod(method,
1449 compile_id,
1450 masm->code(),
1451 vep_offset,
1452 frame_complete,
1453 stack_slots / VMRegImpl::slots_per_word,
1454 in_ByteSize(-1),
1455 in_ByteSize(-1),
1456 nullptr);
1457 }
1458 address native_func = method->native_function();
1459 assert(native_func != nullptr, "must have function");
1460
1461 // An OopMap for lock (and class if static)
1462 OopMapSet *oop_maps = new OopMapSet();
1463 intptr_t start = (intptr_t)__ pc();
1464
1465 // We have received a description of where all the java arg are located
1466 // on entry to the wrapper. We need to convert these args to where
1467 // the jni function will expect them. To figure out where they go
1468 // we convert the java signature to a C signature by inserting
1469 // the hidden arguments as arg[0] and possibly arg[1] (static method)
1470
1471 const int total_in_args = method->size_of_parameters();
1472 int total_c_args = total_in_args + (method->is_static() ? 2 : 1);
1473
1474 BasicType* out_sig_bt = NEW_RESOURCE_ARRAY(BasicType, total_c_args);
1475 VMRegPair* out_regs = NEW_RESOURCE_ARRAY(VMRegPair, total_c_args);
1476 BasicType* in_elem_bt = nullptr;
1477
1478 int argc = 0;
1479 out_sig_bt[argc++] = T_ADDRESS;
1480 if (method->is_static()) {
1481 out_sig_bt[argc++] = T_OBJECT;
1482 }
1483
1484 for (int i = 0; i < total_in_args ; i++ ) {
1485 out_sig_bt[argc++] = in_sig_bt[i];
1486 }
1487
1488 // Now figure out where the args must be stored and how much stack space
1489 // they require.
1490 int out_arg_slots;
1491 out_arg_slots = c_calling_convention_priv(out_sig_bt, out_regs, total_c_args);
1492
1493 if (out_arg_slots < 0) {
1494 return nullptr;
1495 }
1496
1497 // Compute framesize for the wrapper. We need to handlize all oops in
1498 // incoming registers
1499
1500 // Calculate the total number of stack slots we will need.
1501
1502 // First count the abi requirement plus all of the outgoing args
1503 int stack_slots = SharedRuntime::out_preserve_stack_slots() + out_arg_slots;
1504
1505 // Now the space for the inbound oop handle area
1506 int total_save_slots = 8 * VMRegImpl::slots_per_word; // 8 arguments passed in registers
1507
1508 int oop_handle_offset = stack_slots;
1509 stack_slots += total_save_slots;
1510
1511 // Now any space we need for handlizing a klass if static method
1512
1513 int klass_slot_offset = 0;
1514 int klass_offset = -1;
1515 int lock_slot_offset = 0;
1516 bool is_static = false;
1517
1518 if (method->is_static()) {
1519 klass_slot_offset = stack_slots;
1520 stack_slots += VMRegImpl::slots_per_word;
1521 klass_offset = klass_slot_offset * VMRegImpl::stack_slot_size;
1522 is_static = true;
1523 }
1524
1525 // Plus a lock if needed
1526
1527 if (method->is_synchronized()) {
1528 lock_slot_offset = stack_slots;
1529 stack_slots += VMRegImpl::slots_per_word;
1530 }
1531
1532 // Now a place (+2) to save return values or temp during shuffling
1533 // + 4 for return address (which we own) and saved rfp
1534 stack_slots += 6;
1535
1536 // Ok The space we have allocated will look like:
1537 //
1538 //
1539 // FP-> | |
1540 // |---------------------|
1541 // | 2 slots for moves |
1542 // |---------------------|
1543 // | lock box (if sync) |
1544 // |---------------------| <- lock_slot_offset
1545 // | klass (if static) |
1546 // |---------------------| <- klass_slot_offset
1547 // | oopHandle area |
1548 // |---------------------| <- oop_handle_offset (8 java arg registers)
1549 // | outbound memory |
1550 // | based arguments |
1551 // | |
1552 // |---------------------|
1553 // | |
1554 // SP-> | out_preserved_slots |
1555 //
1556 //
1557
1558
1559 // Now compute actual number of stack words we need rounding to make
1560 // stack properly aligned.
1561 stack_slots = align_up(stack_slots, StackAlignmentInSlots);
1562
1563 int stack_size = stack_slots * VMRegImpl::stack_slot_size;
1564
1565 // First thing make an ic check to see if we should even be here
1566
1567 // We are free to use all registers as temps without saving them and
1568 // restoring them except rfp. rfp is the only callee save register
1569 // as far as the interpreter and the compiler(s) are concerned.
1570
1571 const Register receiver = j_rarg0;
1572
1573 Label exception_pending;
1574
1575 assert_different_registers(receiver, rscratch1);
1576 __ verify_oop(receiver);
1577 __ ic_check(8 /* end_alignment */);
1578
1579 // Verified entry point must be aligned
1580 int vep_offset = ((intptr_t)__ pc()) - start;
1581
1582 // If we have to make this method not-entrant we'll overwrite its
1583 // first instruction with a jump. For this action to be legal we
1584 // must ensure that this first instruction is a B, BL, NOP, BKPT,
1585 // SVC, HVC, or SMC. Make it a NOP.
1586 __ nop();
1587
1588 if (VM_Version::supports_fast_class_init_checks() && method->needs_clinit_barrier()) {
1589 Label L_skip_barrier;
1590 __ mov_metadata(rscratch2, method->method_holder()); // InstanceKlass*
1591 __ clinit_barrier(rscratch2, rscratch1, &L_skip_barrier);
1592 __ far_jump(RuntimeAddress(SharedRuntime::get_handle_wrong_method_stub()));
1593
1594 __ bind(L_skip_barrier);
1595 }
1596
1597 // Generate stack overflow check
1598 __ bang_stack_with_offset(checked_cast<int>(StackOverflow::stack_shadow_zone_size()));
1599
1600 // Generate a new frame for the wrapper.
1601 __ enter();
1602 // -2 because return address is already present and so is saved rfp
1603 __ sub(sp, sp, stack_size - 2*wordSize);
1604
1605 BarrierSetAssembler* bs = BarrierSet::barrier_set()->barrier_set_assembler();
1606 bs->nmethod_entry_barrier(masm, nullptr /* slow_path */, nullptr /* continuation */, nullptr /* guard */);
1607
1608 // Frame is now completed as far as size and linkage.
1609 int frame_complete = ((intptr_t)__ pc()) - start;
1610
1611 // We use r20 as the oop handle for the receiver/klass
1612 // It is callee save so it survives the call to native
1613
1614 const Register oop_handle_reg = r20;
1615
1616 //
1617 // We immediately shuffle the arguments so that any vm call we have to
1618 // make from here on out (sync slow path, jvmti, etc.) we will have
1619 // captured the oops from our caller and have a valid oopMap for
1620 // them.
1621
1622 // -----------------
1623 // The Grand Shuffle
1624
1625 // The Java calling convention is either equal (linux) or denser (win64) than the
1626 // c calling convention. However the because of the jni_env argument the c calling
1627 // convention always has at least one more (and two for static) arguments than Java.
1628 // Therefore if we move the args from java -> c backwards then we will never have
1629 // a register->register conflict and we don't have to build a dependency graph
1630 // and figure out how to break any cycles.
1631 //
1632
1633 // Record esp-based slot for receiver on stack for non-static methods
1634 int receiver_offset = -1;
1635
1636 // This is a trick. We double the stack slots so we can claim
1637 // the oops in the caller's frame. Since we are sure to have
1638 // more args than the caller doubling is enough to make
1639 // sure we can capture all the incoming oop args from the
1640 // caller.
1641 //
1642 OopMap* map = new OopMap(stack_slots * 2, 0 /* arg_slots*/);
1643
1644 // Mark location of rfp (someday)
1645 // map->set_callee_saved(VMRegImpl::stack2reg( stack_slots - 2), stack_slots * 2, 0, vmreg(rfp));
1646
1647
1648 int float_args = 0;
1649 int int_args = 0;
1650
1651 #ifdef ASSERT
1652 bool reg_destroyed[Register::number_of_registers];
1653 bool freg_destroyed[FloatRegister::number_of_registers];
1654 for ( int r = 0 ; r < Register::number_of_registers ; r++ ) {
1655 reg_destroyed[r] = false;
1656 }
1657 for ( int f = 0 ; f < FloatRegister::number_of_registers ; f++ ) {
1658 freg_destroyed[f] = false;
1659 }
1660
1661 #endif /* ASSERT */
1662
1663 // For JNI natives the incoming and outgoing registers are offset upwards.
1664 GrowableArray<int> arg_order(2 * total_in_args);
1665 VMRegPair tmp_vmreg;
1666 tmp_vmreg.set2(r19->as_VMReg());
1667
1668 for (int i = total_in_args - 1, c_arg = total_c_args - 1; i >= 0; i--, c_arg--) {
1669 arg_order.push(i);
1670 arg_order.push(c_arg);
1671 }
1672
1673 int temploc = -1;
1674 for (int ai = 0; ai < arg_order.length(); ai += 2) {
1675 int i = arg_order.at(ai);
1676 int c_arg = arg_order.at(ai + 1);
1677 __ block_comment(err_msg("move %d -> %d", i, c_arg));
1678 assert(c_arg != -1 && i != -1, "wrong order");
1679 #ifdef ASSERT
1680 if (in_regs[i].first()->is_Register()) {
1681 assert(!reg_destroyed[in_regs[i].first()->as_Register()->encoding()], "destroyed reg!");
1682 } else if (in_regs[i].first()->is_FloatRegister()) {
1683 assert(!freg_destroyed[in_regs[i].first()->as_FloatRegister()->encoding()], "destroyed reg!");
1684 }
1685 if (out_regs[c_arg].first()->is_Register()) {
1686 reg_destroyed[out_regs[c_arg].first()->as_Register()->encoding()] = true;
1687 } else if (out_regs[c_arg].first()->is_FloatRegister()) {
1688 freg_destroyed[out_regs[c_arg].first()->as_FloatRegister()->encoding()] = true;
1689 }
1690 #endif /* ASSERT */
1691 switch (in_sig_bt[i]) {
1692 case T_ARRAY:
1693 case T_OBJECT:
1694 __ object_move(map, oop_handle_offset, stack_slots, in_regs[i], out_regs[c_arg],
1695 ((i == 0) && (!is_static)),
1696 &receiver_offset);
1697 int_args++;
1698 break;
1699 case T_VOID:
1700 break;
1701
1702 case T_FLOAT:
1703 __ float_move(in_regs[i], out_regs[c_arg]);
1704 float_args++;
1705 break;
1706
1707 case T_DOUBLE:
1708 assert( i + 1 < total_in_args &&
1709 in_sig_bt[i + 1] == T_VOID &&
1710 out_sig_bt[c_arg+1] == T_VOID, "bad arg list");
1711 __ double_move(in_regs[i], out_regs[c_arg]);
1712 float_args++;
1713 break;
1714
1715 case T_LONG :
1716 __ long_move(in_regs[i], out_regs[c_arg]);
1717 int_args++;
1718 break;
1719
1720 case T_ADDRESS: assert(false, "found T_ADDRESS in java args");
1721
1722 default:
1723 __ move32_64(in_regs[i], out_regs[c_arg]);
1724 int_args++;
1725 }
1726 }
1727
1728 // point c_arg at the first arg that is already loaded in case we
1729 // need to spill before we call out
1730 int c_arg = total_c_args - total_in_args;
1731
1732 // Pre-load a static method's oop into c_rarg1.
1733 if (method->is_static()) {
1734
1735 // load oop into a register
1736 __ movoop(c_rarg1,
1737 JNIHandles::make_local(method->method_holder()->java_mirror()));
1738
1739 // Now handlize the static class mirror it's known not-null.
1740 __ str(c_rarg1, Address(sp, klass_offset));
1741 map->set_oop(VMRegImpl::stack2reg(klass_slot_offset));
1742
1743 // Now get the handle
1744 __ lea(c_rarg1, Address(sp, klass_offset));
1745 // and protect the arg if we must spill
1746 c_arg--;
1747 }
1748
1749 // Change state to native (we save the return address in the thread, since it might not
1750 // be pushed on the stack when we do a stack traversal).
1751 // We use the same pc/oopMap repeatedly when we call out
1752
1753 Label native_return;
1754 __ set_last_Java_frame(sp, noreg, native_return, rscratch1);
1755
1756 Label dtrace_method_entry, dtrace_method_entry_done;
1757 {
1758 uint64_t offset;
1759 __ adrp(rscratch1, ExternalAddress((address)&DTraceMethodProbes), offset);
1760 __ ldrb(rscratch1, Address(rscratch1, offset));
1761 __ cbnzw(rscratch1, dtrace_method_entry);
1762 __ bind(dtrace_method_entry_done);
1763 }
1764
1765 // RedefineClasses() tracing support for obsolete method entry
1766 if (log_is_enabled(Trace, redefine, class, obsolete)) {
1767 // protect the args we've loaded
1768 save_args(masm, total_c_args, c_arg, out_regs);
1769 __ mov_metadata(c_rarg1, method());
1770 __ call_VM_leaf(
1771 CAST_FROM_FN_PTR(address, SharedRuntime::rc_trace_method_entry),
1772 rthread, c_rarg1);
1773 restore_args(masm, total_c_args, c_arg, out_regs);
1774 }
1775
1776 // Lock a synchronized method
1777
1778 // Register definitions used by locking and unlocking
1779
1780 const Register swap_reg = r0;
1781 const Register obj_reg = r19; // Will contain the oop
1782 const Register lock_reg = r13; // Address of compiler lock object (BasicLock)
1783 const Register old_hdr = r13; // value of old header at unlock time
1784 const Register lock_tmp = r14; // Temporary used by lightweight_lock/unlock
1785 const Register tmp = lr;
1786
1787 Label slow_path_lock;
1788 Label lock_done;
1789
1790 if (method->is_synchronized()) {
1791 Label count;
1792 const int mark_word_offset = BasicLock::displaced_header_offset_in_bytes();
1793
1794 // Get the handle (the 2nd argument)
1795 __ mov(oop_handle_reg, c_rarg1);
1796
1797 // Get address of the box
1798
1799 __ lea(lock_reg, Address(sp, lock_slot_offset * VMRegImpl::stack_slot_size));
1800
1801 // Load the oop from the handle
1802 __ ldr(obj_reg, Address(oop_handle_reg, 0));
1803
1804 if (LockingMode == LM_MONITOR) {
1805 __ b(slow_path_lock);
1806 } else if (LockingMode == LM_LEGACY) {
1807 // Load (object->mark() | 1) into swap_reg %r0
1808 __ ldr(rscratch1, Address(obj_reg, oopDesc::mark_offset_in_bytes()));
1809 __ orr(swap_reg, rscratch1, 1);
1810
1811 // Save (object->mark() | 1) into BasicLock's displaced header
1812 __ str(swap_reg, Address(lock_reg, mark_word_offset));
1813
1814 // src -> dest iff dest == r0 else r0 <- dest
1815 __ cmpxchg_obj_header(r0, lock_reg, obj_reg, rscratch1, count, /*fallthrough*/nullptr);
1816
1817 // Hmm should this move to the slow path code area???
1818
1819 // Test if the oopMark is an obvious stack pointer, i.e.,
1820 // 1) (mark & 3) == 0, and
1821 // 2) sp <= mark < mark + os::pagesize()
1822 // These 3 tests can be done by evaluating the following
1823 // expression: ((mark - sp) & (3 - os::vm_page_size())),
1824 // assuming both stack pointer and pagesize have their
1825 // least significant 2 bits clear.
1826 // NOTE: the oopMark is in swap_reg %r0 as the result of cmpxchg
1827
1828 __ sub(swap_reg, sp, swap_reg);
1829 __ neg(swap_reg, swap_reg);
1830 __ ands(swap_reg, swap_reg, 3 - (int)os::vm_page_size());
1831
1832 // Save the test result, for recursive case, the result is zero
1833 __ str(swap_reg, Address(lock_reg, mark_word_offset));
1834 __ br(Assembler::NE, slow_path_lock);
1835 } else {
1836 assert(LockingMode == LM_LIGHTWEIGHT, "must be");
1837 __ lightweight_lock(obj_reg, swap_reg, tmp, lock_tmp, slow_path_lock);
1838 }
1839 __ bind(count);
1840 __ increment(Address(rthread, JavaThread::held_monitor_count_offset()));
1841
1842 // Slow path will re-enter here
1843 __ bind(lock_done);
1844 }
1845
1846
1847 // Finally just about ready to make the JNI call
1848
1849 // get JNIEnv* which is first argument to native
1850 __ lea(c_rarg0, Address(rthread, in_bytes(JavaThread::jni_environment_offset())));
1851
1852 // Now set thread in native
1853 __ mov(rscratch1, _thread_in_native);
1854 __ lea(rscratch2, Address(rthread, JavaThread::thread_state_offset()));
1855 __ stlrw(rscratch1, rscratch2);
1856
1857 __ rt_call(native_func);
1858
1859 __ bind(native_return);
1860
1861 intptr_t return_pc = (intptr_t) __ pc();
1862 oop_maps->add_gc_map(return_pc - start, map);
1863
1864 // Verify or restore cpu control state after JNI call
1865 __ restore_cpu_control_state_after_jni(rscratch1, rscratch2);
1866
1867 // Unpack native results.
1868 switch (ret_type) {
1869 case T_BOOLEAN: __ c2bool(r0); break;
1870 case T_CHAR : __ ubfx(r0, r0, 0, 16); break;
1871 case T_BYTE : __ sbfx(r0, r0, 0, 8); break;
1872 case T_SHORT : __ sbfx(r0, r0, 0, 16); break;
1873 case T_INT : __ sbfx(r0, r0, 0, 32); break;
1874 case T_DOUBLE :
1875 case T_FLOAT :
1876 // Result is in v0 we'll save as needed
1877 break;
1878 case T_ARRAY: // Really a handle
1879 case T_OBJECT: // Really a handle
1880 break; // can't de-handlize until after safepoint check
1881 case T_VOID: break;
1882 case T_LONG: break;
1883 default : ShouldNotReachHere();
1884 }
1885
1886 Label safepoint_in_progress, safepoint_in_progress_done;
1887 Label after_transition;
1888
1889 // Switch thread to "native transition" state before reading the synchronization state.
1890 // This additional state is necessary because reading and testing the synchronization
1891 // state is not atomic w.r.t. GC, as this scenario demonstrates:
1892 // Java thread A, in _thread_in_native state, loads _not_synchronized and is preempted.
1893 // VM thread changes sync state to synchronizing and suspends threads for GC.
1894 // Thread A is resumed to finish this native method, but doesn't block here since it
1895 // didn't see any synchronization is progress, and escapes.
1896 __ mov(rscratch1, _thread_in_native_trans);
1897
1898 __ strw(rscratch1, Address(rthread, JavaThread::thread_state_offset()));
1899
1900 // Force this write out before the read below
1901 if (!UseSystemMemoryBarrier) {
1902 __ dmb(Assembler::ISH);
1903 }
1904
1905 __ verify_sve_vector_length();
1906
1907 // Check for safepoint operation in progress and/or pending suspend requests.
1908 {
1909 // We need an acquire here to ensure that any subsequent load of the
1910 // global SafepointSynchronize::_state flag is ordered after this load
1911 // of the thread-local polling word. We don't want this poll to
1912 // return false (i.e. not safepointing) and a later poll of the global
1913 // SafepointSynchronize::_state spuriously to return true.
1914 //
1915 // This is to avoid a race when we're in a native->Java transition
1916 // racing the code which wakes up from a safepoint.
1917
1918 __ safepoint_poll(safepoint_in_progress, true /* at_return */, true /* acquire */, false /* in_nmethod */);
1919 __ ldrw(rscratch1, Address(rthread, JavaThread::suspend_flags_offset()));
1920 __ cbnzw(rscratch1, safepoint_in_progress);
1921 __ bind(safepoint_in_progress_done);
1922 }
1923
1924 // change thread state
1925 __ mov(rscratch1, _thread_in_Java);
1926 __ lea(rscratch2, Address(rthread, JavaThread::thread_state_offset()));
1927 __ stlrw(rscratch1, rscratch2);
1928 __ bind(after_transition);
1929
1930 Label reguard;
1931 Label reguard_done;
1932 __ ldrb(rscratch1, Address(rthread, JavaThread::stack_guard_state_offset()));
1933 __ cmpw(rscratch1, StackOverflow::stack_guard_yellow_reserved_disabled);
1934 __ br(Assembler::EQ, reguard);
1935 __ bind(reguard_done);
1936
1937 // native result if any is live
1938
1939 // Unlock
1940 Label unlock_done;
1941 Label slow_path_unlock;
1942 if (method->is_synchronized()) {
1943
1944 // Get locked oop from the handle we passed to jni
1945 __ ldr(obj_reg, Address(oop_handle_reg, 0));
1946
1947 Label done, not_recursive;
1948
1949 if (LockingMode == LM_LEGACY) {
1950 // Simple recursive lock?
1951 __ ldr(rscratch1, Address(sp, lock_slot_offset * VMRegImpl::stack_slot_size));
1952 __ cbnz(rscratch1, not_recursive);
1953 __ decrement(Address(rthread, JavaThread::held_monitor_count_offset()));
1954 __ b(done);
1955 }
1956
1957 __ bind(not_recursive);
1958
1959 // Must save r0 if if it is live now because cmpxchg must use it
1960 if (ret_type != T_FLOAT && ret_type != T_DOUBLE && ret_type != T_VOID) {
1961 save_native_result(masm, ret_type, stack_slots);
1962 }
1963
1964 if (LockingMode == LM_MONITOR) {
1965 __ b(slow_path_unlock);
1966 } else if (LockingMode == LM_LEGACY) {
1967 // get address of the stack lock
1968 __ lea(r0, Address(sp, lock_slot_offset * VMRegImpl::stack_slot_size));
1969 // get old displaced header
1970 __ ldr(old_hdr, Address(r0, 0));
1971
1972 // Atomic swap old header if oop still contains the stack lock
1973 Label count;
1974 __ cmpxchg_obj_header(r0, old_hdr, obj_reg, rscratch1, count, &slow_path_unlock);
1975 __ bind(count);
1976 __ decrement(Address(rthread, JavaThread::held_monitor_count_offset()));
1977 } else {
1978 assert(LockingMode == LM_LIGHTWEIGHT, "");
1979 __ lightweight_unlock(obj_reg, old_hdr, swap_reg, lock_tmp, slow_path_unlock);
1980 __ decrement(Address(rthread, JavaThread::held_monitor_count_offset()));
1981 }
1982
1983 // slow path re-enters here
1984 __ bind(unlock_done);
1985 if (ret_type != T_FLOAT && ret_type != T_DOUBLE && ret_type != T_VOID) {
1986 restore_native_result(masm, ret_type, stack_slots);
1987 }
1988
1989 __ bind(done);
1990 }
1991
1992 Label dtrace_method_exit, dtrace_method_exit_done;
1993 {
1994 uint64_t offset;
1995 __ adrp(rscratch1, ExternalAddress((address)&DTraceMethodProbes), offset);
1996 __ ldrb(rscratch1, Address(rscratch1, offset));
1997 __ cbnzw(rscratch1, dtrace_method_exit);
1998 __ bind(dtrace_method_exit_done);
1999 }
2000
2001 __ reset_last_Java_frame(false);
2002
2003 // Unbox oop result, e.g. JNIHandles::resolve result.
2004 if (is_reference_type(ret_type)) {
2005 __ resolve_jobject(r0, r1, r2);
2006 }
2007
2008 if (CheckJNICalls) {
2009 // clear_pending_jni_exception_check
2010 __ str(zr, Address(rthread, JavaThread::pending_jni_exception_check_fn_offset()));
2011 }
2012
2013 // reset handle block
2014 __ ldr(r2, Address(rthread, JavaThread::active_handles_offset()));
2015 __ str(zr, Address(r2, JNIHandleBlock::top_offset()));
2016
2017 __ leave();
2018
2019 // Any exception pending?
2020 __ ldr(rscratch1, Address(rthread, in_bytes(Thread::pending_exception_offset())));
2021 __ cbnz(rscratch1, exception_pending);
2022
2023 // We're done
2024 __ ret(lr);
2025
2026 // Unexpected paths are out of line and go here
2027
2028 // forward the exception
2029 __ bind(exception_pending);
2030
2031 // and forward the exception
2032 __ far_jump(RuntimeAddress(StubRoutines::forward_exception_entry()));
2033
2034 // Slow path locking & unlocking
2035 if (method->is_synchronized()) {
2036
2037 __ block_comment("Slow path lock {");
2038 __ bind(slow_path_lock);
2039
2040 // has last_Java_frame setup. No exceptions so do vanilla call not call_VM
2041 // args are (oop obj, BasicLock* lock, JavaThread* thread)
2042
2043 // protect the args we've loaded
2044 save_args(masm, total_c_args, c_arg, out_regs);
2045
2046 __ mov(c_rarg0, obj_reg);
2047 __ mov(c_rarg1, lock_reg);
2048 __ mov(c_rarg2, rthread);
2049
2050 // Not a leaf but we have last_Java_frame setup as we want
2051 __ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::complete_monitor_locking_C), 3);
2052 restore_args(masm, total_c_args, c_arg, out_regs);
2053
2054 #ifdef ASSERT
2055 { Label L;
2056 __ ldr(rscratch1, Address(rthread, in_bytes(Thread::pending_exception_offset())));
2057 __ cbz(rscratch1, L);
2058 __ stop("no pending exception allowed on exit from monitorenter");
2059 __ bind(L);
2060 }
2061 #endif
2062 __ b(lock_done);
2063
2064 __ block_comment("} Slow path lock");
2065
2066 __ block_comment("Slow path unlock {");
2067 __ bind(slow_path_unlock);
2068
2069 // If we haven't already saved the native result we must save it now as xmm registers
2070 // are still exposed.
2071
2072 if (ret_type == T_FLOAT || ret_type == T_DOUBLE ) {
2073 save_native_result(masm, ret_type, stack_slots);
2074 }
2075
2076 __ mov(c_rarg2, rthread);
2077 __ lea(c_rarg1, Address(sp, lock_slot_offset * VMRegImpl::stack_slot_size));
2078 __ mov(c_rarg0, obj_reg);
2079
2080 // Save pending exception around call to VM (which contains an EXCEPTION_MARK)
2081 // NOTE that obj_reg == r19 currently
2082 __ ldr(r19, Address(rthread, in_bytes(Thread::pending_exception_offset())));
2083 __ str(zr, Address(rthread, in_bytes(Thread::pending_exception_offset())));
2084
2085 __ rt_call(CAST_FROM_FN_PTR(address, SharedRuntime::complete_monitor_unlocking_C));
2086
2087 #ifdef ASSERT
2088 {
2089 Label L;
2090 __ ldr(rscratch1, Address(rthread, in_bytes(Thread::pending_exception_offset())));
2091 __ cbz(rscratch1, L);
2092 __ stop("no pending exception allowed on exit complete_monitor_unlocking_C");
2093 __ bind(L);
2094 }
2095 #endif /* ASSERT */
2096
2097 __ str(r19, Address(rthread, in_bytes(Thread::pending_exception_offset())));
2098
2099 if (ret_type == T_FLOAT || ret_type == T_DOUBLE ) {
2100 restore_native_result(masm, ret_type, stack_slots);
2101 }
2102 __ b(unlock_done);
2103
2104 __ block_comment("} Slow path unlock");
2105
2106 } // synchronized
2107
2108 // SLOW PATH Reguard the stack if needed
2109
2110 __ bind(reguard);
2111 save_native_result(masm, ret_type, stack_slots);
2112 __ rt_call(CAST_FROM_FN_PTR(address, SharedRuntime::reguard_yellow_pages));
2113 restore_native_result(masm, ret_type, stack_slots);
2114 // and continue
2115 __ b(reguard_done);
2116
2117 // SLOW PATH safepoint
2118 {
2119 __ block_comment("safepoint {");
2120 __ bind(safepoint_in_progress);
2121
2122 // Don't use call_VM as it will see a possible pending exception and forward it
2123 // and never return here preventing us from clearing _last_native_pc down below.
2124 //
2125 save_native_result(masm, ret_type, stack_slots);
2126 __ mov(c_rarg0, rthread);
2127 #ifndef PRODUCT
2128 assert(frame::arg_reg_save_area_bytes == 0, "not expecting frame reg save area");
2129 #endif
2130 __ lea(rscratch1, RuntimeAddress(CAST_FROM_FN_PTR(address, JavaThread::check_special_condition_for_native_trans)));
2131 __ blr(rscratch1);
2132
2133 // Restore any method result value
2134 restore_native_result(masm, ret_type, stack_slots);
2135
2136 __ b(safepoint_in_progress_done);
2137 __ block_comment("} safepoint");
2138 }
2139
2140 // SLOW PATH dtrace support
2141 {
2142 __ block_comment("dtrace entry {");
2143 __ bind(dtrace_method_entry);
2144
2145 // We have all of the arguments setup at this point. We must not touch any register
2146 // argument registers at this point (what if we save/restore them there are no oop?
2147
2148 save_args(masm, total_c_args, c_arg, out_regs);
2149 __ mov_metadata(c_rarg1, method());
2150 __ call_VM_leaf(
2151 CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_entry),
2152 rthread, c_rarg1);
2153 restore_args(masm, total_c_args, c_arg, out_regs);
2154 __ b(dtrace_method_entry_done);
2155 __ block_comment("} dtrace entry");
2156 }
2157
2158 {
2159 __ block_comment("dtrace exit {");
2160 __ bind(dtrace_method_exit);
2161 save_native_result(masm, ret_type, stack_slots);
2162 __ mov_metadata(c_rarg1, method());
2163 __ call_VM_leaf(
2164 CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_exit),
2165 rthread, c_rarg1);
2166 restore_native_result(masm, ret_type, stack_slots);
2167 __ b(dtrace_method_exit_done);
2168 __ block_comment("} dtrace exit");
2169 }
2170
2171
2172 __ flush();
2173
2174 nmethod *nm = nmethod::new_native_nmethod(method,
2175 compile_id,
2176 masm->code(),
2177 vep_offset,
2178 frame_complete,
2179 stack_slots / VMRegImpl::slots_per_word,
2180 (is_static ? in_ByteSize(klass_offset) : in_ByteSize(receiver_offset)),
2181 in_ByteSize(lock_slot_offset*VMRegImpl::stack_slot_size),
2182 oop_maps);
2183
2184 return nm;
2185 }
2186
2187 // this function returns the adjust size (in number of words) to a c2i adapter
2188 // activation for use during deoptimization
2189 int Deoptimization::last_frame_adjust(int callee_parameters, int callee_locals) {
2190 assert(callee_locals >= callee_parameters,
2191 "test and remove; got more parms than locals");
2192 if (callee_locals < callee_parameters)
2193 return 0; // No adjustment for negative locals
2194 int diff = (callee_locals - callee_parameters) * Interpreter::stackElementWords;
2195 // diff is counted in stack words
2196 return align_up(diff, 2);
2197 }
2198
2199
2200 //------------------------------generate_deopt_blob----------------------------
2201 void SharedRuntime::generate_deopt_blob() {
2202 // Allocate space for the code
2203 ResourceMark rm;
2204 // Setup code generation tools
2205 int pad = 0;
2206 #if INCLUDE_JVMCI
2207 if (EnableJVMCI) {
2208 pad += 512; // Increase the buffer size when compiling for JVMCI
2209 }
2210 #endif
2211 CodeBuffer buffer("deopt_blob", 2048+pad, 1024);
2212 MacroAssembler* masm = new MacroAssembler(&buffer);
2213 int frame_size_in_words;
2214 OopMap* map = nullptr;
2215 OopMapSet *oop_maps = new OopMapSet();
2216 RegisterSaver reg_save(COMPILER2_OR_JVMCI != 0);
2217
2218 // -------------
2219 // This code enters when returning to a de-optimized nmethod. A return
2220 // address has been pushed on the stack, and return values are in
2221 // registers.
2222 // If we are doing a normal deopt then we were called from the patched
2223 // nmethod from the point we returned to the nmethod. So the return
2224 // address on the stack is wrong by NativeCall::instruction_size
2225 // We will adjust the value so it looks like we have the original return
2226 // address on the stack (like when we eagerly deoptimized).
2227 // In the case of an exception pending when deoptimizing, we enter
2228 // with a return address on the stack that points after the call we patched
2229 // into the exception handler. We have the following register state from,
2230 // e.g., the forward exception stub (see stubGenerator_x86_64.cpp).
2231 // r0: exception oop
2232 // r19: exception handler
2233 // r3: throwing pc
2234 // So in this case we simply jam r3 into the useless return address and
2235 // the stack looks just like we want.
2236 //
2237 // At this point we need to de-opt. We save the argument return
2238 // registers. We call the first C routine, fetch_unroll_info(). This
2239 // routine captures the return values and returns a structure which
2240 // describes the current frame size and the sizes of all replacement frames.
2241 // The current frame is compiled code and may contain many inlined
2242 // functions, each with their own JVM state. We pop the current frame, then
2243 // push all the new frames. Then we call the C routine unpack_frames() to
2244 // populate these frames. Finally unpack_frames() returns us the new target
2245 // address. Notice that callee-save registers are BLOWN here; they have
2246 // already been captured in the vframeArray at the time the return PC was
2247 // patched.
2248 address start = __ pc();
2249 Label cont;
2250
2251 // Prolog for non exception case!
2252
2253 // Save everything in sight.
2254 map = reg_save.save_live_registers(masm, 0, &frame_size_in_words);
2255
2256 // Normal deoptimization. Save exec mode for unpack_frames.
2257 __ movw(rcpool, Deoptimization::Unpack_deopt); // callee-saved
2258 __ b(cont);
2259
2260 int reexecute_offset = __ pc() - start;
2261 #if INCLUDE_JVMCI && !defined(COMPILER1)
2262 if (EnableJVMCI && UseJVMCICompiler) {
2263 // JVMCI does not use this kind of deoptimization
2264 __ should_not_reach_here();
2265 }
2266 #endif
2267
2268 // Reexecute case
2269 // return address is the pc describes what bci to do re-execute at
2270
2271 // No need to update map as each call to save_live_registers will produce identical oopmap
2272 (void) reg_save.save_live_registers(masm, 0, &frame_size_in_words);
2273
2274 __ movw(rcpool, Deoptimization::Unpack_reexecute); // callee-saved
2275 __ b(cont);
2276
2277 #if INCLUDE_JVMCI
2278 Label after_fetch_unroll_info_call;
2279 int implicit_exception_uncommon_trap_offset = 0;
2280 int uncommon_trap_offset = 0;
2281
2282 if (EnableJVMCI) {
2283 implicit_exception_uncommon_trap_offset = __ pc() - start;
2284
2285 __ ldr(lr, Address(rthread, in_bytes(JavaThread::jvmci_implicit_exception_pc_offset())));
2286 __ str(zr, Address(rthread, in_bytes(JavaThread::jvmci_implicit_exception_pc_offset())));
2287
2288 uncommon_trap_offset = __ pc() - start;
2289
2290 // Save everything in sight.
2291 reg_save.save_live_registers(masm, 0, &frame_size_in_words);
2292 // fetch_unroll_info needs to call last_java_frame()
2293 Label retaddr;
2294 __ set_last_Java_frame(sp, noreg, retaddr, rscratch1);
2295
2296 __ ldrw(c_rarg1, Address(rthread, in_bytes(JavaThread::pending_deoptimization_offset())));
2297 __ movw(rscratch1, -1);
2298 __ strw(rscratch1, Address(rthread, in_bytes(JavaThread::pending_deoptimization_offset())));
2299
2300 __ movw(rcpool, (int32_t)Deoptimization::Unpack_reexecute);
2301 __ mov(c_rarg0, rthread);
2302 __ movw(c_rarg2, rcpool); // exec mode
2303 __ lea(rscratch1,
2304 RuntimeAddress(CAST_FROM_FN_PTR(address,
2305 Deoptimization::uncommon_trap)));
2306 __ blr(rscratch1);
2307 __ bind(retaddr);
2308 oop_maps->add_gc_map( __ pc()-start, map->deep_copy());
2309
2310 __ reset_last_Java_frame(false);
2311
2312 __ b(after_fetch_unroll_info_call);
2313 } // EnableJVMCI
2314 #endif // INCLUDE_JVMCI
2315
2316 int exception_offset = __ pc() - start;
2317
2318 // Prolog for exception case
2319
2320 // all registers are dead at this entry point, except for r0, and
2321 // r3 which contain the exception oop and exception pc
2322 // respectively. Set them in TLS and fall thru to the
2323 // unpack_with_exception_in_tls entry point.
2324
2325 __ str(r3, Address(rthread, JavaThread::exception_pc_offset()));
2326 __ str(r0, Address(rthread, JavaThread::exception_oop_offset()));
2327
2328 int exception_in_tls_offset = __ pc() - start;
2329
2330 // new implementation because exception oop is now passed in JavaThread
2331
2332 // Prolog for exception case
2333 // All registers must be preserved because they might be used by LinearScan
2334 // Exceptiop oop and throwing PC are passed in JavaThread
2335 // tos: stack at point of call to method that threw the exception (i.e. only
2336 // args are on the stack, no return address)
2337
2338 // The return address pushed by save_live_registers will be patched
2339 // later with the throwing pc. The correct value is not available
2340 // now because loading it from memory would destroy registers.
2341
2342 // NB: The SP at this point must be the SP of the method that is
2343 // being deoptimized. Deoptimization assumes that the frame created
2344 // here by save_live_registers is immediately below the method's SP.
2345 // This is a somewhat fragile mechanism.
2346
2347 // Save everything in sight.
2348 map = reg_save.save_live_registers(masm, 0, &frame_size_in_words);
2349
2350 // Now it is safe to overwrite any register
2351
2352 // Deopt during an exception. Save exec mode for unpack_frames.
2353 __ mov(rcpool, Deoptimization::Unpack_exception); // callee-saved
2354
2355 // load throwing pc from JavaThread and patch it as the return address
2356 // of the current frame. Then clear the field in JavaThread
2357 __ ldr(r3, Address(rthread, JavaThread::exception_pc_offset()));
2358 __ protect_return_address(r3);
2359 __ str(r3, Address(rfp, wordSize));
2360 __ str(zr, Address(rthread, JavaThread::exception_pc_offset()));
2361
2362 #ifdef ASSERT
2363 // verify that there is really an exception oop in JavaThread
2364 __ ldr(r0, Address(rthread, JavaThread::exception_oop_offset()));
2365 __ verify_oop(r0);
2366
2367 // verify that there is no pending exception
2368 Label no_pending_exception;
2369 __ ldr(rscratch1, Address(rthread, Thread::pending_exception_offset()));
2370 __ cbz(rscratch1, no_pending_exception);
2371 __ stop("must not have pending exception here");
2372 __ bind(no_pending_exception);
2373 #endif
2374
2375 __ bind(cont);
2376
2377 // Call C code. Need thread and this frame, but NOT official VM entry
2378 // crud. We cannot block on this call, no GC can happen.
2379 //
2380 // UnrollBlock* fetch_unroll_info(JavaThread* thread)
2381
2382 // fetch_unroll_info needs to call last_java_frame().
2383
2384 Label retaddr;
2385 __ set_last_Java_frame(sp, noreg, retaddr, rscratch1);
2386 #ifdef ASSERT
2387 { Label L;
2388 __ ldr(rscratch1, Address(rthread, JavaThread::last_Java_fp_offset()));
2389 __ cbz(rscratch1, L);
2390 __ stop("SharedRuntime::generate_deopt_blob: last_Java_fp not cleared");
2391 __ bind(L);
2392 }
2393 #endif // ASSERT
2394 __ mov(c_rarg0, rthread);
2395 __ mov(c_rarg1, rcpool);
2396 __ lea(rscratch1, RuntimeAddress(CAST_FROM_FN_PTR(address, Deoptimization::fetch_unroll_info)));
2397 __ blr(rscratch1);
2398 __ bind(retaddr);
2399
2400 // Need to have an oopmap that tells fetch_unroll_info where to
2401 // find any register it might need.
2402 oop_maps->add_gc_map(__ pc() - start, map);
2403
2404 __ reset_last_Java_frame(false);
2405
2406 #if INCLUDE_JVMCI
2407 if (EnableJVMCI) {
2408 __ bind(after_fetch_unroll_info_call);
2409 }
2410 #endif
2411
2412 // Load UnrollBlock* into r5
2413 __ mov(r5, r0);
2414
2415 __ ldrw(rcpool, Address(r5, Deoptimization::UnrollBlock::unpack_kind_offset()));
2416 Label noException;
2417 __ cmpw(rcpool, Deoptimization::Unpack_exception); // Was exception pending?
2418 __ br(Assembler::NE, noException);
2419 __ ldr(r0, Address(rthread, JavaThread::exception_oop_offset()));
2420 // QQQ this is useless it was null above
2421 __ ldr(r3, Address(rthread, JavaThread::exception_pc_offset()));
2422 __ str(zr, Address(rthread, JavaThread::exception_oop_offset()));
2423 __ str(zr, Address(rthread, JavaThread::exception_pc_offset()));
2424
2425 __ verify_oop(r0);
2426
2427 // Overwrite the result registers with the exception results.
2428 __ str(r0, Address(sp, reg_save.r0_offset_in_bytes()));
2429 // I think this is useless
2430 // __ str(r3, Address(sp, RegisterSaver::r3_offset_in_bytes()));
2431
2432 __ bind(noException);
2433
2434 // Only register save data is on the stack.
2435 // Now restore the result registers. Everything else is either dead
2436 // or captured in the vframeArray.
2437
2438 // Restore fp result register
2439 __ ldrd(v0, Address(sp, reg_save.v0_offset_in_bytes()));
2440 // Restore integer result register
2441 __ ldr(r0, Address(sp, reg_save.r0_offset_in_bytes()));
2442
2443 // Pop all of the register save area off the stack
2444 __ add(sp, sp, frame_size_in_words * wordSize);
2445
2446 // All of the register save area has been popped of the stack. Only the
2447 // return address remains.
2448
2449 // Pop all the frames we must move/replace.
2450 //
2451 // Frame picture (youngest to oldest)
2452 // 1: self-frame (no frame link)
2453 // 2: deopting frame (no frame link)
2454 // 3: caller of deopting frame (could be compiled/interpreted).
2455 //
2456 // Note: by leaving the return address of self-frame on the stack
2457 // and using the size of frame 2 to adjust the stack
2458 // when we are done the return to frame 3 will still be on the stack.
2459
2460 // Pop deoptimized frame
2461 __ ldrw(r2, Address(r5, Deoptimization::UnrollBlock::size_of_deoptimized_frame_offset()));
2462 __ sub(r2, r2, 2 * wordSize);
2463 __ add(sp, sp, r2);
2464 __ ldp(rfp, zr, __ post(sp, 2 * wordSize));
2465
2466 #ifdef ASSERT
2467 // Compilers generate code that bang the stack by as much as the
2468 // interpreter would need. So this stack banging should never
2469 // trigger a fault. Verify that it does not on non product builds.
2470 __ ldrw(r19, Address(r5, Deoptimization::UnrollBlock::total_frame_sizes_offset()));
2471 __ bang_stack_size(r19, r2);
2472 #endif
2473 // Load address of array of frame pcs into r2
2474 __ ldr(r2, Address(r5, Deoptimization::UnrollBlock::frame_pcs_offset()));
2475
2476 // Trash the old pc
2477 // __ addptr(sp, wordSize); FIXME ????
2478
2479 // Load address of array of frame sizes into r4
2480 __ ldr(r4, Address(r5, Deoptimization::UnrollBlock::frame_sizes_offset()));
2481
2482 // Load counter into r3
2483 __ ldrw(r3, Address(r5, Deoptimization::UnrollBlock::number_of_frames_offset()));
2484
2485 // Now adjust the caller's stack to make up for the extra locals
2486 // but record the original sp so that we can save it in the skeletal interpreter
2487 // frame and the stack walking of interpreter_sender will get the unextended sp
2488 // value and not the "real" sp value.
2489
2490 const Register sender_sp = r6;
2491
2492 __ mov(sender_sp, sp);
2493 __ ldrw(r19, Address(r5,
2494 Deoptimization::UnrollBlock::
2495 caller_adjustment_offset()));
2496 __ sub(sp, sp, r19);
2497
2498 // Push interpreter frames in a loop
2499 __ mov(rscratch1, (uint64_t)0xDEADDEAD); // Make a recognizable pattern
2500 __ mov(rscratch2, rscratch1);
2501 Label loop;
2502 __ bind(loop);
2503 __ ldr(r19, Address(__ post(r4, wordSize))); // Load frame size
2504 __ sub(r19, r19, 2*wordSize); // We'll push pc and fp by hand
2505 __ ldr(lr, Address(__ post(r2, wordSize))); // Load pc
2506 __ enter(); // Save old & set new fp
2507 __ sub(sp, sp, r19); // Prolog
2508 // This value is corrected by layout_activation_impl
2509 __ str(zr, Address(rfp, frame::interpreter_frame_last_sp_offset * wordSize));
2510 __ str(sender_sp, Address(rfp, frame::interpreter_frame_sender_sp_offset * wordSize)); // Make it walkable
2511 __ mov(sender_sp, sp); // Pass sender_sp to next frame
2512 __ sub(r3, r3, 1); // Decrement counter
2513 __ cbnz(r3, loop);
2514
2515 // Re-push self-frame
2516 __ ldr(lr, Address(r2));
2517 __ enter();
2518
2519 // Allocate a full sized register save area. We subtract 2 because
2520 // enter() just pushed 2 words
2521 __ sub(sp, sp, (frame_size_in_words - 2) * wordSize);
2522
2523 // Restore frame locals after moving the frame
2524 __ strd(v0, Address(sp, reg_save.v0_offset_in_bytes()));
2525 __ str(r0, Address(sp, reg_save.r0_offset_in_bytes()));
2526
2527 // Call C code. Need thread but NOT official VM entry
2528 // crud. We cannot block on this call, no GC can happen. Call should
2529 // restore return values to their stack-slots with the new SP.
2530 //
2531 // void Deoptimization::unpack_frames(JavaThread* thread, int exec_mode)
2532
2533 // Use rfp because the frames look interpreted now
2534 // Don't need the precise return PC here, just precise enough to point into this code blob.
2535 address the_pc = __ pc();
2536 __ set_last_Java_frame(sp, rfp, the_pc, rscratch1);
2537
2538 __ mov(c_rarg0, rthread);
2539 __ movw(c_rarg1, rcpool); // second arg: exec_mode
2540 __ lea(rscratch1, RuntimeAddress(CAST_FROM_FN_PTR(address, Deoptimization::unpack_frames)));
2541 __ blr(rscratch1);
2542
2543 // Set an oopmap for the call site
2544 // Use the same PC we used for the last java frame
2545 oop_maps->add_gc_map(the_pc - start,
2546 new OopMap( frame_size_in_words, 0 ));
2547
2548 // Clear fp AND pc
2549 __ reset_last_Java_frame(true);
2550
2551 // Collect return values
2552 __ ldrd(v0, Address(sp, reg_save.v0_offset_in_bytes()));
2553 __ ldr(r0, Address(sp, reg_save.r0_offset_in_bytes()));
2554 // I think this is useless (throwing pc?)
2555 // __ ldr(r3, Address(sp, RegisterSaver::r3_offset_in_bytes()));
2556
2557 // Pop self-frame.
2558 __ leave(); // Epilog
2559
2560 // Jump to interpreter
2561 __ ret(lr);
2562
2563 // Make sure all code is generated
2564 masm->flush();
2565
2566 _deopt_blob = DeoptimizationBlob::create(&buffer, oop_maps, 0, exception_offset, reexecute_offset, frame_size_in_words);
2567 _deopt_blob->set_unpack_with_exception_in_tls_offset(exception_in_tls_offset);
2568 #if INCLUDE_JVMCI
2569 if (EnableJVMCI) {
2570 _deopt_blob->set_uncommon_trap_offset(uncommon_trap_offset);
2571 _deopt_blob->set_implicit_exception_uncommon_trap_offset(implicit_exception_uncommon_trap_offset);
2572 }
2573 #endif
2574 }
2575
2576 // Number of stack slots between incoming argument block and the start of
2577 // a new frame. The PROLOG must add this many slots to the stack. The
2578 // EPILOG must remove this many slots. aarch64 needs two slots for
2579 // return address and fp.
2580 // TODO think this is correct but check
2581 uint SharedRuntime::in_preserve_stack_slots() {
2582 return 4;
2583 }
2584
2585 uint SharedRuntime::out_preserve_stack_slots() {
2586 return 0;
2587 }
2588
2589 #ifdef COMPILER2
2590 //------------------------------generate_uncommon_trap_blob--------------------
2591 void SharedRuntime::generate_uncommon_trap_blob() {
2592 // Allocate space for the code
2593 ResourceMark rm;
2594 // Setup code generation tools
2595 CodeBuffer buffer("uncommon_trap_blob", 2048, 1024);
2596 MacroAssembler* masm = new MacroAssembler(&buffer);
2597
2598 assert(SimpleRuntimeFrame::framesize % 4 == 0, "sp not 16-byte aligned");
2599
2600 address start = __ pc();
2601
2602 // Push self-frame. We get here with a return address in LR
2603 // and sp should be 16 byte aligned
2604 // push rfp and retaddr by hand
2605 __ protect_return_address();
2606 __ stp(rfp, lr, Address(__ pre(sp, -2 * wordSize)));
2607 // we don't expect an arg reg save area
2608 #ifndef PRODUCT
2609 assert(frame::arg_reg_save_area_bytes == 0, "not expecting frame reg save area");
2610 #endif
2611 // compiler left unloaded_class_index in j_rarg0 move to where the
2612 // runtime expects it.
2613 if (c_rarg1 != j_rarg0) {
2614 __ movw(c_rarg1, j_rarg0);
2615 }
2616
2617 // we need to set the past SP to the stack pointer of the stub frame
2618 // and the pc to the address where this runtime call will return
2619 // although actually any pc in this code blob will do).
2620 Label retaddr;
2621 __ set_last_Java_frame(sp, noreg, retaddr, rscratch1);
2622
2623 // Call C code. Need thread but NOT official VM entry
2624 // crud. We cannot block on this call, no GC can happen. Call should
2625 // capture callee-saved registers as well as return values.
2626 // Thread is in rdi already.
2627 //
2628 // UnrollBlock* uncommon_trap(JavaThread* thread, jint unloaded_class_index);
2629 //
2630 // n.b. 2 gp args, 0 fp args, integral return type
2631
2632 __ mov(c_rarg0, rthread);
2633 __ movw(c_rarg2, (unsigned)Deoptimization::Unpack_uncommon_trap);
2634 __ lea(rscratch1,
2635 RuntimeAddress(CAST_FROM_FN_PTR(address,
2636 Deoptimization::uncommon_trap)));
2637 __ blr(rscratch1);
2638 __ bind(retaddr);
2639
2640 // Set an oopmap for the call site
2641 OopMapSet* oop_maps = new OopMapSet();
2642 OopMap* map = new OopMap(SimpleRuntimeFrame::framesize, 0);
2643
2644 // location of rfp is known implicitly by the frame sender code
2645
2646 oop_maps->add_gc_map(__ pc() - start, map);
2647
2648 __ reset_last_Java_frame(false);
2649
2650 // move UnrollBlock* into r4
2651 __ mov(r4, r0);
2652
2653 #ifdef ASSERT
2654 { Label L;
2655 __ ldrw(rscratch1, Address(r4, Deoptimization::UnrollBlock::unpack_kind_offset()));
2656 __ cmpw(rscratch1, (unsigned)Deoptimization::Unpack_uncommon_trap);
2657 __ br(Assembler::EQ, L);
2658 __ stop("SharedRuntime::generate_uncommon_trap_blob: expected Unpack_uncommon_trap");
2659 __ bind(L);
2660 }
2661 #endif
2662
2663 // Pop all the frames we must move/replace.
2664 //
2665 // Frame picture (youngest to oldest)
2666 // 1: self-frame (no frame link)
2667 // 2: deopting frame (no frame link)
2668 // 3: caller of deopting frame (could be compiled/interpreted).
2669
2670 // Pop self-frame. We have no frame, and must rely only on r0 and sp.
2671 __ add(sp, sp, (SimpleRuntimeFrame::framesize) << LogBytesPerInt); // Epilog!
2672
2673 // Pop deoptimized frame (int)
2674 __ ldrw(r2, Address(r4,
2675 Deoptimization::UnrollBlock::
2676 size_of_deoptimized_frame_offset()));
2677 __ sub(r2, r2, 2 * wordSize);
2678 __ add(sp, sp, r2);
2679 __ ldp(rfp, zr, __ post(sp, 2 * wordSize));
2680
2681 #ifdef ASSERT
2682 // Compilers generate code that bang the stack by as much as the
2683 // interpreter would need. So this stack banging should never
2684 // trigger a fault. Verify that it does not on non product builds.
2685 __ ldrw(r1, Address(r4,
2686 Deoptimization::UnrollBlock::
2687 total_frame_sizes_offset()));
2688 __ bang_stack_size(r1, r2);
2689 #endif
2690
2691 // Load address of array of frame pcs into r2 (address*)
2692 __ ldr(r2, Address(r4,
2693 Deoptimization::UnrollBlock::frame_pcs_offset()));
2694
2695 // Load address of array of frame sizes into r5 (intptr_t*)
2696 __ ldr(r5, Address(r4,
2697 Deoptimization::UnrollBlock::
2698 frame_sizes_offset()));
2699
2700 // Counter
2701 __ ldrw(r3, Address(r4,
2702 Deoptimization::UnrollBlock::
2703 number_of_frames_offset())); // (int)
2704
2705 // Now adjust the caller's stack to make up for the extra locals but
2706 // record the original sp so that we can save it in the skeletal
2707 // interpreter frame and the stack walking of interpreter_sender
2708 // will get the unextended sp value and not the "real" sp value.
2709
2710 const Register sender_sp = r8;
2711
2712 __ mov(sender_sp, sp);
2713 __ ldrw(r1, Address(r4,
2714 Deoptimization::UnrollBlock::
2715 caller_adjustment_offset())); // (int)
2716 __ sub(sp, sp, r1);
2717
2718 // Push interpreter frames in a loop
2719 Label loop;
2720 __ bind(loop);
2721 __ ldr(r1, Address(r5, 0)); // Load frame size
2722 __ sub(r1, r1, 2 * wordSize); // We'll push pc and rfp by hand
2723 __ ldr(lr, Address(r2, 0)); // Save return address
2724 __ enter(); // and old rfp & set new rfp
2725 __ sub(sp, sp, r1); // Prolog
2726 __ str(sender_sp, Address(rfp, frame::interpreter_frame_sender_sp_offset * wordSize)); // Make it walkable
2727 // This value is corrected by layout_activation_impl
2728 __ str(zr, Address(rfp, frame::interpreter_frame_last_sp_offset * wordSize));
2729 __ mov(sender_sp, sp); // Pass sender_sp to next frame
2730 __ add(r5, r5, wordSize); // Bump array pointer (sizes)
2731 __ add(r2, r2, wordSize); // Bump array pointer (pcs)
2732 __ subsw(r3, r3, 1); // Decrement counter
2733 __ br(Assembler::GT, loop);
2734 __ ldr(lr, Address(r2, 0)); // save final return address
2735 // Re-push self-frame
2736 __ enter(); // & old rfp & set new rfp
2737
2738 // Use rfp because the frames look interpreted now
2739 // Save "the_pc" since it cannot easily be retrieved using the last_java_SP after we aligned SP.
2740 // Don't need the precise return PC here, just precise enough to point into this code blob.
2741 address the_pc = __ pc();
2742 __ set_last_Java_frame(sp, rfp, the_pc, rscratch1);
2743
2744 // Call C code. Need thread but NOT official VM entry
2745 // crud. We cannot block on this call, no GC can happen. Call should
2746 // restore return values to their stack-slots with the new SP.
2747 // Thread is in rdi already.
2748 //
2749 // BasicType unpack_frames(JavaThread* thread, int exec_mode);
2750 //
2751 // n.b. 2 gp args, 0 fp args, integral return type
2752
2753 // sp should already be aligned
2754 __ mov(c_rarg0, rthread);
2755 __ movw(c_rarg1, (unsigned)Deoptimization::Unpack_uncommon_trap);
2756 __ lea(rscratch1, RuntimeAddress(CAST_FROM_FN_PTR(address, Deoptimization::unpack_frames)));
2757 __ blr(rscratch1);
2758
2759 // Set an oopmap for the call site
2760 // Use the same PC we used for the last java frame
2761 oop_maps->add_gc_map(the_pc - start, new OopMap(SimpleRuntimeFrame::framesize, 0));
2762
2763 // Clear fp AND pc
2764 __ reset_last_Java_frame(true);
2765
2766 // Pop self-frame.
2767 __ leave(); // Epilog
2768
2769 // Jump to interpreter
2770 __ ret(lr);
2771
2772 // Make sure all code is generated
2773 masm->flush();
2774
2775 _uncommon_trap_blob = UncommonTrapBlob::create(&buffer, oop_maps,
2776 SimpleRuntimeFrame::framesize >> 1);
2777 }
2778 #endif // COMPILER2
2779
2780
2781 //------------------------------generate_handler_blob------
2782 //
2783 // Generate a special Compile2Runtime blob that saves all registers,
2784 // and setup oopmap.
2785 //
2786 SafepointBlob* SharedRuntime::generate_handler_blob(address call_ptr, int poll_type) {
2787 ResourceMark rm;
2788 OopMapSet *oop_maps = new OopMapSet();
2789 OopMap* map;
2790
2791 // Allocate space for the code. Setup code generation tools.
2792 CodeBuffer buffer("handler_blob", 2048, 1024);
2793 MacroAssembler* masm = new MacroAssembler(&buffer);
2794
2795 address start = __ pc();
2796 address call_pc = nullptr;
2797 int frame_size_in_words;
2798 bool cause_return = (poll_type == POLL_AT_RETURN);
2799 RegisterSaver reg_save(poll_type == POLL_AT_VECTOR_LOOP /* save_vectors */);
2800
2801 // When the signal occurred, the LR was either signed and stored on the stack (in which
2802 // case it will be restored from the stack before being used) or unsigned and not stored
2803 // on the stack. Stipping ensures we get the right value.
2804 __ strip_return_address();
2805
2806 // Save Integer and Float registers.
2807 map = reg_save.save_live_registers(masm, 0, &frame_size_in_words);
2808
2809 // The following is basically a call_VM. However, we need the precise
2810 // address of the call in order to generate an oopmap. Hence, we do all the
2811 // work ourselves.
2812
2813 Label retaddr;
2814 __ set_last_Java_frame(sp, noreg, retaddr, rscratch1);
2815
2816 // The return address must always be correct so that frame constructor never
2817 // sees an invalid pc.
2818
2819 if (!cause_return) {
2820 // overwrite the return address pushed by save_live_registers
2821 // Additionally, r20 is a callee-saved register so we can look at
2822 // it later to determine if someone changed the return address for
2823 // us!
2824 __ ldr(r20, Address(rthread, JavaThread::saved_exception_pc_offset()));
2825 __ protect_return_address(r20);
2826 __ str(r20, Address(rfp, wordSize));
2827 }
2828
2829 // Do the call
2830 __ mov(c_rarg0, rthread);
2831 __ lea(rscratch1, RuntimeAddress(call_ptr));
2832 __ blr(rscratch1);
2833 __ bind(retaddr);
2834
2835 // Set an oopmap for the call site. This oopmap will map all
2836 // oop-registers and debug-info registers as callee-saved. This
2837 // will allow deoptimization at this safepoint to find all possible
2838 // debug-info recordings, as well as let GC find all oops.
2839
2840 oop_maps->add_gc_map( __ pc() - start, map);
2841
2842 Label noException;
2843
2844 __ reset_last_Java_frame(false);
2845
2846 __ membar(Assembler::LoadLoad | Assembler::LoadStore);
2847
2848 __ ldr(rscratch1, Address(rthread, Thread::pending_exception_offset()));
2849 __ cbz(rscratch1, noException);
2850
2851 // Exception pending
2852
2853 reg_save.restore_live_registers(masm);
2854
2855 __ far_jump(RuntimeAddress(StubRoutines::forward_exception_entry()));
2856
2857 // No exception case
2858 __ bind(noException);
2859
2860 Label no_adjust, bail;
2861 if (!cause_return) {
2862 // If our stashed return pc was modified by the runtime we avoid touching it
2863 __ ldr(rscratch1, Address(rfp, wordSize));
2864 __ cmp(r20, rscratch1);
2865 __ br(Assembler::NE, no_adjust);
2866 __ authenticate_return_address(r20);
2867
2868 #ifdef ASSERT
2869 // Verify the correct encoding of the poll we're about to skip.
2870 // See NativeInstruction::is_ldrw_to_zr()
2871 __ ldrw(rscratch1, Address(r20));
2872 __ ubfx(rscratch2, rscratch1, 22, 10);
2873 __ cmpw(rscratch2, 0b1011100101);
2874 __ br(Assembler::NE, bail);
2875 __ ubfx(rscratch2, rscratch1, 0, 5);
2876 __ cmpw(rscratch2, 0b11111);
2877 __ br(Assembler::NE, bail);
2878 #endif
2879 // Adjust return pc forward to step over the safepoint poll instruction
2880 __ add(r20, r20, NativeInstruction::instruction_size);
2881 __ protect_return_address(r20);
2882 __ str(r20, Address(rfp, wordSize));
2883 }
2884
2885 __ bind(no_adjust);
2886 // Normal exit, restore registers and exit.
2887 reg_save.restore_live_registers(masm);
2888
2889 __ ret(lr);
2890
2891 #ifdef ASSERT
2892 __ bind(bail);
2893 __ stop("Attempting to adjust pc to skip safepoint poll but the return point is not what we expected");
2894 #endif
2895
2896 // Make sure all code is generated
2897 masm->flush();
2898
2899 // Fill-out other meta info
2900 return SafepointBlob::create(&buffer, oop_maps, frame_size_in_words);
2901 }
2902
2903 //
2904 // generate_resolve_blob - call resolution (static/virtual/opt-virtual/ic-miss
2905 //
2906 // Generate a stub that calls into vm to find out the proper destination
2907 // of a java call. All the argument registers are live at this point
2908 // but since this is generic code we don't know what they are and the caller
2909 // must do any gc of the args.
2910 //
2911 RuntimeStub* SharedRuntime::generate_resolve_blob(address destination, const char* name) {
2912 assert (StubRoutines::forward_exception_entry() != nullptr, "must be generated before");
2913
2914 // allocate space for the code
2915 ResourceMark rm;
2916
2917 CodeBuffer buffer(name, 1000, 512);
2918 MacroAssembler* masm = new MacroAssembler(&buffer);
2919
2920 int frame_size_in_words;
2921 RegisterSaver reg_save(false /* save_vectors */);
2922
2923 OopMapSet *oop_maps = new OopMapSet();
2924 OopMap* map = nullptr;
2925
2926 int start = __ offset();
2927
2928 map = reg_save.save_live_registers(masm, 0, &frame_size_in_words);
2929
2930 int frame_complete = __ offset();
2931
2932 {
2933 Label retaddr;
2934 __ set_last_Java_frame(sp, noreg, retaddr, rscratch1);
2935
2936 __ mov(c_rarg0, rthread);
2937 __ lea(rscratch1, RuntimeAddress(destination));
2938
2939 __ blr(rscratch1);
2940 __ bind(retaddr);
2941 }
2942
2943 // Set an oopmap for the call site.
2944 // We need this not only for callee-saved registers, but also for volatile
2945 // registers that the compiler might be keeping live across a safepoint.
2946
2947 oop_maps->add_gc_map( __ offset() - start, map);
2948
2949 // r0 contains the address we are going to jump to assuming no exception got installed
2950
2951 // clear last_Java_sp
2952 __ reset_last_Java_frame(false);
2953 // check for pending exceptions
2954 Label pending;
2955 __ ldr(rscratch1, Address(rthread, Thread::pending_exception_offset()));
2956 __ cbnz(rscratch1, pending);
2957
2958 // get the returned Method*
2959 __ get_vm_result_2(rmethod, rthread);
2960 __ str(rmethod, Address(sp, reg_save.reg_offset_in_bytes(rmethod)));
2961
2962 // r0 is where we want to jump, overwrite rscratch1 which is saved and scratch
2963 __ str(r0, Address(sp, reg_save.rscratch1_offset_in_bytes()));
2964 reg_save.restore_live_registers(masm);
2965
2966 // We are back to the original state on entry and ready to go.
2967
2968 __ br(rscratch1);
2969
2970 // Pending exception after the safepoint
2971
2972 __ bind(pending);
2973
2974 reg_save.restore_live_registers(masm);
2975
2976 // exception pending => remove activation and forward to exception handler
2977
2978 __ str(zr, Address(rthread, JavaThread::vm_result_offset()));
2979
2980 __ ldr(r0, Address(rthread, Thread::pending_exception_offset()));
2981 __ far_jump(RuntimeAddress(StubRoutines::forward_exception_entry()));
2982
2983 // -------------
2984 // make sure all code is generated
2985 masm->flush();
2986
2987 // return the blob
2988 // frame_size_words or bytes??
2989 return RuntimeStub::new_runtime_stub(name, &buffer, frame_complete, frame_size_in_words, oop_maps, true);
2990 }
2991
2992 #ifdef COMPILER2
2993 // This is here instead of runtime_aarch64_64.cpp because it uses SimpleRuntimeFrame
2994 //
2995 //------------------------------generate_exception_blob---------------------------
2996 // creates exception blob at the end
2997 // Using exception blob, this code is jumped from a compiled method.
2998 // (see emit_exception_handler in x86_64.ad file)
2999 //
3000 // Given an exception pc at a call we call into the runtime for the
3001 // handler in this method. This handler might merely restore state
3002 // (i.e. callee save registers) unwind the frame and jump to the
3003 // exception handler for the nmethod if there is no Java level handler
3004 // for the nmethod.
3005 //
3006 // This code is entered with a jmp.
3007 //
3008 // Arguments:
3009 // r0: exception oop
3010 // r3: exception pc
3011 //
3012 // Results:
3013 // r0: exception oop
3014 // r3: exception pc in caller or ???
3015 // destination: exception handler of caller
3016 //
3017 // Note: the exception pc MUST be at a call (precise debug information)
3018 // Registers r0, r3, r2, r4, r5, r8-r11 are not callee saved.
3019 //
3020
3021 void OptoRuntime::generate_exception_blob() {
3022 assert(!OptoRuntime::is_callee_saved_register(R3_num), "");
3023 assert(!OptoRuntime::is_callee_saved_register(R0_num), "");
3024 assert(!OptoRuntime::is_callee_saved_register(R2_num), "");
3025
3026 assert(SimpleRuntimeFrame::framesize % 4 == 0, "sp not 16-byte aligned");
3027
3028 // Allocate space for the code
3029 ResourceMark rm;
3030 // Setup code generation tools
3031 CodeBuffer buffer("exception_blob", 2048, 1024);
3032 MacroAssembler* masm = new MacroAssembler(&buffer);
3033
3034 // TODO check various assumptions made here
3035 //
3036 // make sure we do so before running this
3037
3038 address start = __ pc();
3039
3040 // push rfp and retaddr by hand
3041 // Exception pc is 'return address' for stack walker
3042 __ protect_return_address();
3043 __ stp(rfp, lr, Address(__ pre(sp, -2 * wordSize)));
3044 // there are no callee save registers and we don't expect an
3045 // arg reg save area
3046 #ifndef PRODUCT
3047 assert(frame::arg_reg_save_area_bytes == 0, "not expecting frame reg save area");
3048 #endif
3049 // Store exception in Thread object. We cannot pass any arguments to the
3050 // handle_exception call, since we do not want to make any assumption
3051 // about the size of the frame where the exception happened in.
3052 __ str(r0, Address(rthread, JavaThread::exception_oop_offset()));
3053 __ str(r3, Address(rthread, JavaThread::exception_pc_offset()));
3054
3055 // This call does all the hard work. It checks if an exception handler
3056 // exists in the method.
3057 // If so, it returns the handler address.
3058 // If not, it prepares for stack-unwinding, restoring the callee-save
3059 // registers of the frame being removed.
3060 //
3061 // address OptoRuntime::handle_exception_C(JavaThread* thread)
3062 //
3063 // n.b. 1 gp arg, 0 fp args, integral return type
3064
3065 // the stack should always be aligned
3066 address the_pc = __ pc();
3067 __ set_last_Java_frame(sp, noreg, the_pc, rscratch1);
3068 __ mov(c_rarg0, rthread);
3069 __ lea(rscratch1, RuntimeAddress(CAST_FROM_FN_PTR(address, OptoRuntime::handle_exception_C)));
3070 __ blr(rscratch1);
3071 // handle_exception_C is a special VM call which does not require an explicit
3072 // instruction sync afterwards.
3073
3074 // May jump to SVE compiled code
3075 __ reinitialize_ptrue();
3076
3077 // Set an oopmap for the call site. This oopmap will only be used if we
3078 // are unwinding the stack. Hence, all locations will be dead.
3079 // Callee-saved registers will be the same as the frame above (i.e.,
3080 // handle_exception_stub), since they were restored when we got the
3081 // exception.
3082
3083 OopMapSet* oop_maps = new OopMapSet();
3084
3085 oop_maps->add_gc_map(the_pc - start, new OopMap(SimpleRuntimeFrame::framesize, 0));
3086
3087 __ reset_last_Java_frame(false);
3088
3089 // Restore callee-saved registers
3090
3091 // rfp is an implicitly saved callee saved register (i.e. the calling
3092 // convention will save restore it in prolog/epilog) Other than that
3093 // there are no callee save registers now that adapter frames are gone.
3094 // and we dont' expect an arg reg save area
3095 __ ldp(rfp, r3, Address(__ post(sp, 2 * wordSize)));
3096 __ authenticate_return_address(r3);
3097
3098 // r0: exception handler
3099
3100 // We have a handler in r0 (could be deopt blob).
3101 __ mov(r8, r0);
3102
3103 // Get the exception oop
3104 __ ldr(r0, Address(rthread, JavaThread::exception_oop_offset()));
3105 // Get the exception pc in case we are deoptimized
3106 __ ldr(r4, Address(rthread, JavaThread::exception_pc_offset()));
3107 #ifdef ASSERT
3108 __ str(zr, Address(rthread, JavaThread::exception_handler_pc_offset()));
3109 __ str(zr, Address(rthread, JavaThread::exception_pc_offset()));
3110 #endif
3111 // Clear the exception oop so GC no longer processes it as a root.
3112 __ str(zr, Address(rthread, JavaThread::exception_oop_offset()));
3113
3114 // r0: exception oop
3115 // r8: exception handler
3116 // r4: exception pc
3117 // Jump to handler
3118
3119 __ br(r8);
3120
3121 // Make sure all code is generated
3122 masm->flush();
3123
3124 // Set exception blob
3125 _exception_blob = ExceptionBlob::create(&buffer, oop_maps, SimpleRuntimeFrame::framesize >> 1);
3126 }
3127
3128 #endif // COMPILER2