1 /*
2 * Copyright (c) 2003, 2023, 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/icBuffer.hpp"
34 #include "code/vtableStubs.hpp"
35 #include "compiler/oopMap.hpp"
36 #include "gc/shared/barrierSetAssembler.hpp"
37 #include "interpreter/interpreter.hpp"
38 #include "interpreter/interp_masm.hpp"
39 #include "logging/log.hpp"
40 #include "memory/resourceArea.hpp"
41 #include "nativeInst_aarch64.hpp"
42 #include "oops/compiledICHolder.hpp"
43 #include "oops/klass.inline.hpp"
44 #include "oops/method.inline.hpp"
45 #include "prims/methodHandles.hpp"
46 #include "runtime/continuation.hpp"
47 #include "runtime/continuationEntry.inline.hpp"
48 #include "runtime/globals.hpp"
49 #include "runtime/jniHandles.hpp"
50 #include "runtime/safepointMechanism.hpp"
51 #include "runtime/sharedRuntime.hpp"
52 #include "runtime/signature.hpp"
53 #include "runtime/stubRoutines.hpp"
54 #include "runtime/vframeArray.hpp"
55 #include "utilities/align.hpp"
56 #include "utilities/formatBuffer.hpp"
57 #include "vmreg_aarch64.inline.hpp"
58 #ifdef COMPILER1
59 #include "c1/c1_Runtime1.hpp"
60 #endif
61 #ifdef COMPILER2
62 #include "adfiles/ad_aarch64.hpp"
63 #include "opto/runtime.hpp"
64 #endif
65 #if INCLUDE_JVMCI
66 #include "jvmci/jvmciJavaClasses.hpp"
67 #endif
68
69 #define __ masm->
70
71 const int StackAlignmentInSlots = StackAlignmentInBytes / VMRegImpl::stack_slot_size;
72
73 class SimpleRuntimeFrame {
74
75 public:
76
77 // Most of the runtime stubs have this simple frame layout.
78 // This class exists to make the layout shared in one place.
79 // Offsets are for compiler stack slots, which are jints.
80 enum layout {
81 // The frame sender code expects that rbp will be in the "natural" place and
82 // will override any oopMap setting for it. We must therefore force the layout
83 // so that it agrees with the frame sender code.
84 // we don't expect any arg reg save area so aarch64 asserts that
85 // frame::arg_reg_save_area_bytes == 0
86 rfp_off = 0,
87 rfp_off2,
88 return_off, return_off2,
89 framesize
90 };
91 };
92
93 // FIXME -- this is used by C1
94 class RegisterSaver {
95 const bool _save_vectors;
96 public:
97 RegisterSaver(bool save_vectors) : _save_vectors(save_vectors) {}
98
99 OopMap* save_live_registers(MacroAssembler* masm, int additional_frame_words, int* total_frame_words);
100 void restore_live_registers(MacroAssembler* masm);
101
102 // Offsets into the register save area
103 // Used by deoptimization when it is managing result register
104 // values on its own
105
106 int reg_offset_in_bytes(Register r);
107 int r0_offset_in_bytes() { return reg_offset_in_bytes(r0); }
108 int rscratch1_offset_in_bytes() { return reg_offset_in_bytes(rscratch1); }
109 int v0_offset_in_bytes();
110
111 // Total stack size in bytes for saving sve predicate registers.
112 int total_sve_predicate_in_bytes();
113
114 // Capture info about frame layout
115 // Note this is only correct when not saving full vectors.
116 enum layout {
117 fpu_state_off = 0,
118 fpu_state_end = fpu_state_off + FPUStateSizeInWords - 1,
119 // The frame sender code expects that rfp will be in
120 // the "natural" place and will override any oopMap
121 // setting for it. We must therefore force the layout
122 // so that it agrees with the frame sender code.
123 r0_off = fpu_state_off + FPUStateSizeInWords,
124 rfp_off = r0_off + (Register::number_of_registers - 2) * Register::max_slots_per_register,
125 return_off = rfp_off + Register::max_slots_per_register, // slot for return address
126 reg_save_size = return_off + Register::max_slots_per_register};
127
128 };
129
130 int RegisterSaver::reg_offset_in_bytes(Register r) {
131 // The integer registers are located above the floating point
132 // registers in the stack frame pushed by save_live_registers() so the
133 // offset depends on whether we are saving full vectors, and whether
134 // those vectors are NEON or SVE.
135
136 int slots_per_vect = FloatRegister::save_slots_per_register;
137
138 #if COMPILER2_OR_JVMCI
139 if (_save_vectors) {
140 slots_per_vect = FloatRegister::slots_per_neon_register;
141
142 #ifdef COMPILER2
143 if (Matcher::supports_scalable_vector()) {
144 slots_per_vect = Matcher::scalable_vector_reg_size(T_FLOAT);
145 }
146 #endif
147 }
148 #endif
149
150 int r0_offset = v0_offset_in_bytes() + (slots_per_vect * FloatRegister::number_of_registers) * BytesPerInt;
151 return r0_offset + r->encoding() * wordSize;
152 }
153
154 int RegisterSaver::v0_offset_in_bytes() {
155 // The floating point registers are located above the predicate registers if
156 // they are present in the stack frame pushed by save_live_registers(). So the
157 // offset depends on the saved total predicate vectors in the stack frame.
158 return (total_sve_predicate_in_bytes() / VMRegImpl::stack_slot_size) * BytesPerInt;
159 }
160
161 int RegisterSaver::total_sve_predicate_in_bytes() {
162 #ifdef COMPILER2
163 if (_save_vectors && Matcher::supports_scalable_vector()) {
164 return (Matcher::scalable_vector_reg_size(T_BYTE) >> LogBitsPerByte) *
165 PRegister::number_of_registers;
166 }
167 #endif
168 return 0;
169 }
170
171 OopMap* RegisterSaver::save_live_registers(MacroAssembler* masm, int additional_frame_words, int* total_frame_words) {
172 bool use_sve = false;
173 int sve_vector_size_in_bytes = 0;
174 int sve_vector_size_in_slots = 0;
175 int sve_predicate_size_in_slots = 0;
176 int total_predicate_in_bytes = total_sve_predicate_in_bytes();
177 int total_predicate_in_slots = total_predicate_in_bytes / VMRegImpl::stack_slot_size;
178
179 #ifdef COMPILER2
180 use_sve = Matcher::supports_scalable_vector();
181 if (use_sve) {
182 sve_vector_size_in_bytes = Matcher::scalable_vector_reg_size(T_BYTE);
183 sve_vector_size_in_slots = Matcher::scalable_vector_reg_size(T_FLOAT);
184 sve_predicate_size_in_slots = Matcher::scalable_predicate_reg_slots();
185 }
186 #endif
187
188 #if COMPILER2_OR_JVMCI
189 if (_save_vectors) {
190 int extra_save_slots_per_register = 0;
191 // Save upper half of vector registers
192 if (use_sve) {
193 extra_save_slots_per_register = sve_vector_size_in_slots - FloatRegister::save_slots_per_register;
194 } else {
195 extra_save_slots_per_register = FloatRegister::extra_save_slots_per_neon_register;
196 }
197 int extra_vector_bytes = extra_save_slots_per_register *
198 VMRegImpl::stack_slot_size *
199 FloatRegister::number_of_registers;
200 additional_frame_words += ((extra_vector_bytes + total_predicate_in_bytes) / wordSize);
201 }
202 #else
203 assert(!_save_vectors, "vectors are generated only by C2 and JVMCI");
204 #endif
205
206 int frame_size_in_bytes = align_up(additional_frame_words * wordSize +
207 reg_save_size * BytesPerInt, 16);
208 // OopMap frame size is in compiler stack slots (jint's) not bytes or words
209 int frame_size_in_slots = frame_size_in_bytes / BytesPerInt;
210 // The caller will allocate additional_frame_words
211 int additional_frame_slots = additional_frame_words * wordSize / BytesPerInt;
212 // CodeBlob frame size is in words.
213 int frame_size_in_words = frame_size_in_bytes / wordSize;
214 *total_frame_words = frame_size_in_words;
215
216 // Save Integer and Float registers.
217 __ enter();
218 __ push_CPU_state(_save_vectors, use_sve, sve_vector_size_in_bytes, total_predicate_in_bytes);
219
220 // Set an oopmap for the call site. This oopmap will map all
221 // oop-registers and debug-info registers as callee-saved. This
222 // will allow deoptimization at this safepoint to find all possible
223 // debug-info recordings, as well as let GC find all oops.
224
225 OopMapSet *oop_maps = new OopMapSet();
226 OopMap* oop_map = new OopMap(frame_size_in_slots, 0);
227
228 for (int i = 0; i < Register::number_of_registers; i++) {
229 Register r = as_Register(i);
230 if (i <= rfp->encoding() && r != rscratch1 && r != rscratch2) {
231 // SP offsets are in 4-byte words.
232 // Register slots are 8 bytes wide, 32 floating-point registers.
233 int sp_offset = Register::max_slots_per_register * i +
234 FloatRegister::save_slots_per_register * FloatRegister::number_of_registers;
235 oop_map->set_callee_saved(VMRegImpl::stack2reg(sp_offset + additional_frame_slots), r->as_VMReg());
236 }
237 }
238
239 for (int i = 0; i < FloatRegister::number_of_registers; i++) {
240 FloatRegister r = as_FloatRegister(i);
241 int sp_offset = 0;
242 if (_save_vectors) {
243 sp_offset = use_sve ? (total_predicate_in_slots + sve_vector_size_in_slots * i) :
244 (FloatRegister::slots_per_neon_register * i);
245 } else {
246 sp_offset = FloatRegister::save_slots_per_register * i;
247 }
248 oop_map->set_callee_saved(VMRegImpl::stack2reg(sp_offset), r->as_VMReg());
249 }
250
251 return oop_map;
252 }
253
254 void RegisterSaver::restore_live_registers(MacroAssembler* masm) {
255 #ifdef COMPILER2
256 __ pop_CPU_state(_save_vectors, Matcher::supports_scalable_vector(),
257 Matcher::scalable_vector_reg_size(T_BYTE), total_sve_predicate_in_bytes());
258 #else
259 #if !INCLUDE_JVMCI
260 assert(!_save_vectors, "vectors are generated only by C2 and JVMCI");
261 #endif
262 __ pop_CPU_state(_save_vectors);
263 #endif
264 __ ldp(rfp, lr, Address(__ post(sp, 2 * wordSize)));
265 __ authenticate_return_address();
266 }
267
268 // Is vector's size (in bytes) bigger than a size saved by default?
269 // 8 bytes vector registers are saved by default on AArch64.
270 // The SVE supported min vector size is 8 bytes and we need to save
271 // predicate registers when the vector size is 8 bytes as well.
272 bool SharedRuntime::is_wide_vector(int size) {
273 return size > 8 || (UseSVE > 0 && size >= 8);
274 }
275
276 // ---------------------------------------------------------------------------
277 // Read the array of BasicTypes from a signature, and compute where the
278 // arguments should go. Values in the VMRegPair regs array refer to 4-byte
279 // quantities. Values less than VMRegImpl::stack0 are registers, those above
280 // refer to 4-byte stack slots. All stack slots are based off of the stack pointer
281 // as framesizes are fixed.
282 // VMRegImpl::stack0 refers to the first slot 0(sp).
283 // and VMRegImpl::stack0+1 refers to the memory word 4-byes higher.
284 // Register up to Register::number_of_registers are the 64-bit
285 // integer registers.
286
287 // Note: the INPUTS in sig_bt are in units of Java argument words,
288 // which are 64-bit. The OUTPUTS are in 32-bit units.
289
290 // The Java calling convention is a "shifted" version of the C ABI.
291 // By skipping the first C ABI register we can call non-static jni
292 // methods with small numbers of arguments without having to shuffle
293 // the arguments at all. Since we control the java ABI we ought to at
294 // least get some advantage out of it.
295
296 int SharedRuntime::java_calling_convention(const BasicType *sig_bt,
297 VMRegPair *regs,
298 int total_args_passed) {
299
300 // Create the mapping between argument positions and
301 // registers.
302 static const Register INT_ArgReg[Argument::n_int_register_parameters_j] = {
303 j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5, j_rarg6, j_rarg7
304 };
305 static const FloatRegister FP_ArgReg[Argument::n_float_register_parameters_j] = {
306 j_farg0, j_farg1, j_farg2, j_farg3,
307 j_farg4, j_farg5, j_farg6, j_farg7
308 };
309
310
311 uint int_args = 0;
312 uint fp_args = 0;
313 uint stk_args = 0; // inc by 2 each time
314
315 for (int i = 0; i < total_args_passed; i++) {
316 switch (sig_bt[i]) {
317 case T_BOOLEAN:
318 case T_CHAR:
319 case T_BYTE:
320 case T_SHORT:
321 case T_INT:
322 if (int_args < Argument::n_int_register_parameters_j) {
323 regs[i].set1(INT_ArgReg[int_args++]->as_VMReg());
324 } else {
325 regs[i].set1(VMRegImpl::stack2reg(stk_args));
326 stk_args += 2;
327 }
328 break;
329 case T_VOID:
330 // halves of T_LONG or T_DOUBLE
331 assert(i != 0 && (sig_bt[i - 1] == T_LONG || sig_bt[i - 1] == T_DOUBLE), "expecting half");
332 regs[i].set_bad();
333 break;
334 case T_LONG:
335 assert((i + 1) < total_args_passed && sig_bt[i + 1] == T_VOID, "expecting half");
336 // fall through
337 case T_OBJECT:
338 case T_ARRAY:
339 case T_ADDRESS:
340 if (int_args < Argument::n_int_register_parameters_j) {
341 regs[i].set2(INT_ArgReg[int_args++]->as_VMReg());
342 } else {
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 regs[i].set1(VMRegImpl::stack2reg(stk_args));
352 stk_args += 2;
353 }
354 break;
355 case T_DOUBLE:
356 assert((i + 1) < total_args_passed && sig_bt[i + 1] == T_VOID, "expecting half");
357 if (fp_args < Argument::n_float_register_parameters_j) {
358 regs[i].set2(FP_ArgReg[fp_args++]->as_VMReg());
359 } else {
360 regs[i].set2(VMRegImpl::stack2reg(stk_args));
361 stk_args += 2;
362 }
363 break;
364 default:
365 ShouldNotReachHere();
366 break;
367 }
368 }
369
370 return align_up(stk_args, 2);
371 }
372
373 // Patch the callers callsite with entry to compiled code if it exists.
374 static void patch_callers_callsite(MacroAssembler *masm) {
375 Label L;
376 __ ldr(rscratch1, Address(rmethod, in_bytes(Method::code_offset())));
377 __ cbz(rscratch1, L);
378
379 __ enter();
380 __ push_CPU_state();
381
382 // VM needs caller's callsite
383 // VM needs target method
384 // This needs to be a long call since we will relocate this adapter to
385 // the codeBuffer and it may not reach
386
387 #ifndef PRODUCT
388 assert(frame::arg_reg_save_area_bytes == 0, "not expecting frame reg save area");
389 #endif
390
391 __ mov(c_rarg0, rmethod);
392 __ mov(c_rarg1, lr);
393 __ authenticate_return_address(c_rarg1, rscratch1);
394 __ lea(rscratch1, RuntimeAddress(CAST_FROM_FN_PTR(address, SharedRuntime::fixup_callers_callsite)));
395 __ blr(rscratch1);
396
397 // Explicit isb required because fixup_callers_callsite may change the code
398 // stream.
399 __ safepoint_isb();
400
401 __ pop_CPU_state();
402 // restore sp
403 __ leave();
404 __ bind(L);
405 }
406
407 static void gen_c2i_adapter(MacroAssembler *masm,
408 int total_args_passed,
409 int comp_args_on_stack,
410 const BasicType *sig_bt,
411 const VMRegPair *regs,
412 Label& skip_fixup) {
413 // Before we get into the guts of the C2I adapter, see if we should be here
414 // at all. We've come from compiled code and are attempting to jump to the
415 // interpreter, which means the caller made a static call to get here
416 // (vcalls always get a compiled target if there is one). Check for a
417 // compiled target. If there is one, we need to patch the caller's call.
418 patch_callers_callsite(masm);
419
420 __ bind(skip_fixup);
421
422 int words_pushed = 0;
423
424 // Since all args are passed on the stack, total_args_passed *
425 // Interpreter::stackElementSize is the space we need.
426
427 int extraspace = total_args_passed * Interpreter::stackElementSize;
428
429 __ mov(r19_sender_sp, sp);
430
431 // stack is aligned, keep it that way
432 extraspace = align_up(extraspace, 2*wordSize);
433
434 if (extraspace)
435 __ sub(sp, sp, extraspace);
436
437 // Now write the args into the outgoing interpreter space
438 for (int i = 0; i < total_args_passed; i++) {
439 if (sig_bt[i] == T_VOID) {
440 assert(i > 0 && (sig_bt[i-1] == T_LONG || sig_bt[i-1] == T_DOUBLE), "missing half");
441 continue;
442 }
443
444 // offset to start parameters
445 int st_off = (total_args_passed - i - 1) * Interpreter::stackElementSize;
446 int next_off = st_off - Interpreter::stackElementSize;
447
448 // Say 4 args:
449 // i st_off
450 // 0 32 T_LONG
451 // 1 24 T_VOID
452 // 2 16 T_OBJECT
453 // 3 8 T_BOOL
454 // - 0 return address
455 //
456 // However to make thing extra confusing. Because we can fit a Java long/double in
457 // a single slot on a 64 bt vm and it would be silly to break them up, the interpreter
458 // leaves one slot empty and only stores to a single slot. In this case the
459 // slot that is occupied is the T_VOID slot. See I said it was confusing.
460
461 VMReg r_1 = regs[i].first();
462 VMReg r_2 = regs[i].second();
463 if (!r_1->is_valid()) {
464 assert(!r_2->is_valid(), "");
465 continue;
466 }
467 if (r_1->is_stack()) {
468 // memory to memory use rscratch1
469 int ld_off = (r_1->reg2stack() * VMRegImpl::stack_slot_size
470 + extraspace
471 + words_pushed * wordSize);
472 if (!r_2->is_valid()) {
473 // sign extend??
474 __ ldrw(rscratch1, Address(sp, ld_off));
475 __ str(rscratch1, Address(sp, st_off));
476
477 } else {
478
479 __ ldr(rscratch1, Address(sp, ld_off));
480
481 // Two VMREgs|OptoRegs can be T_OBJECT, T_ADDRESS, T_DOUBLE, T_LONG
482 // T_DOUBLE and T_LONG use two slots in the interpreter
483 if ( sig_bt[i] == T_LONG || sig_bt[i] == T_DOUBLE) {
484 // ld_off == LSW, ld_off+wordSize == MSW
485 // st_off == MSW, next_off == LSW
486 __ str(rscratch1, Address(sp, next_off));
487 #ifdef ASSERT
488 // Overwrite the unused slot with known junk
489 __ mov(rscratch1, (uint64_t)0xdeadffffdeadaaaaull);
490 __ str(rscratch1, Address(sp, st_off));
491 #endif /* ASSERT */
492 } else {
493 __ str(rscratch1, Address(sp, st_off));
494 }
495 }
496 } else if (r_1->is_Register()) {
497 Register r = r_1->as_Register();
498 if (!r_2->is_valid()) {
499 // must be only an int (or less ) so move only 32bits to slot
500 // why not sign extend??
501 __ str(r, Address(sp, st_off));
502 } else {
503 // Two VMREgs|OptoRegs can be T_OBJECT, T_ADDRESS, T_DOUBLE, T_LONG
504 // T_DOUBLE and T_LONG use two slots in the interpreter
505 if ( sig_bt[i] == T_LONG || sig_bt[i] == T_DOUBLE) {
506 // jlong/double in gpr
507 #ifdef ASSERT
508 // Overwrite the unused slot with known junk
509 __ mov(rscratch1, (uint64_t)0xdeadffffdeadaaabull);
510 __ str(rscratch1, Address(sp, st_off));
511 #endif /* ASSERT */
512 __ str(r, Address(sp, next_off));
513 } else {
514 __ str(r, Address(sp, st_off));
515 }
516 }
517 } else {
518 assert(r_1->is_FloatRegister(), "");
519 if (!r_2->is_valid()) {
520 // only a float use just part of the slot
521 __ strs(r_1->as_FloatRegister(), Address(sp, st_off));
522 } else {
523 #ifdef ASSERT
524 // Overwrite the unused slot with known junk
525 __ mov(rscratch1, (uint64_t)0xdeadffffdeadaaacull);
526 __ str(rscratch1, Address(sp, st_off));
527 #endif /* ASSERT */
528 __ strd(r_1->as_FloatRegister(), Address(sp, next_off));
529 }
530 }
531 }
532
533 __ mov(esp, sp); // Interp expects args on caller's expression stack
534
535 __ ldr(rscratch1, Address(rmethod, in_bytes(Method::interpreter_entry_offset())));
536 __ br(rscratch1);
537 }
538
539
540 void SharedRuntime::gen_i2c_adapter(MacroAssembler *masm,
541 int total_args_passed,
542 int comp_args_on_stack,
543 const BasicType *sig_bt,
544 const VMRegPair *regs) {
545
546 // Note: r19_sender_sp contains the senderSP on entry. We must
547 // preserve it since we may do a i2c -> c2i transition if we lose a
548 // race where compiled code goes non-entrant while we get args
549 // ready.
550
551 // Adapters are frameless.
552
553 // An i2c adapter is frameless because the *caller* frame, which is
554 // interpreted, routinely repairs its own esp (from
555 // interpreter_frame_last_sp), even if a callee has modified the
556 // stack pointer. It also recalculates and aligns sp.
557
558 // A c2i adapter is frameless because the *callee* frame, which is
559 // interpreted, routinely repairs its caller's sp (from sender_sp,
560 // which is set up via the senderSP register).
561
562 // In other words, if *either* the caller or callee is interpreted, we can
563 // get the stack pointer repaired after a call.
564
565 // This is why c2i and i2c adapters cannot be indefinitely composed.
566 // In particular, if a c2i adapter were to somehow call an i2c adapter,
567 // both caller and callee would be compiled methods, and neither would
568 // clean up the stack pointer changes performed by the two adapters.
569 // If this happens, control eventually transfers back to the compiled
570 // caller, but with an uncorrected stack, causing delayed havoc.
571
572 if (VerifyAdapterCalls &&
573 (Interpreter::code() != NULL || StubRoutines::code1() != NULL)) {
574 #if 0
575 // So, let's test for cascading c2i/i2c adapters right now.
576 // assert(Interpreter::contains($return_addr) ||
577 // StubRoutines::contains($return_addr),
578 // "i2c adapter must return to an interpreter frame");
579 __ block_comment("verify_i2c { ");
580 Label L_ok;
581 if (Interpreter::code() != NULL)
582 range_check(masm, rax, r11,
583 Interpreter::code()->code_start(), Interpreter::code()->code_end(),
584 L_ok);
585 if (StubRoutines::code1() != NULL)
586 range_check(masm, rax, r11,
587 StubRoutines::code1()->code_begin(), StubRoutines::code1()->code_end(),
588 L_ok);
589 if (StubRoutines::code2() != NULL)
590 range_check(masm, rax, r11,
591 StubRoutines::code2()->code_begin(), StubRoutines::code2()->code_end(),
592 L_ok);
593 const char* msg = "i2c adapter must return to an interpreter frame";
594 __ block_comment(msg);
595 __ stop(msg);
596 __ bind(L_ok);
597 __ block_comment("} verify_i2ce ");
598 #endif
599 }
600
601 // Cut-out for having no stack args.
602 int comp_words_on_stack = align_up(comp_args_on_stack*VMRegImpl::stack_slot_size, wordSize)>>LogBytesPerWord;
603 if (comp_args_on_stack) {
604 __ sub(rscratch1, sp, comp_words_on_stack * wordSize);
605 __ andr(sp, rscratch1, -16);
606 }
607
608 // Will jump to the compiled code just as if compiled code was doing it.
609 // Pre-load the register-jump target early, to schedule it better.
610 __ ldr(rscratch1, Address(rmethod, in_bytes(Method::from_compiled_offset())));
611
612 #if INCLUDE_JVMCI
613 if (EnableJVMCI) {
614 // check if this call should be routed towards a specific entry point
615 __ ldr(rscratch2, Address(rthread, in_bytes(JavaThread::jvmci_alternate_call_target_offset())));
616 Label no_alternative_target;
617 __ cbz(rscratch2, no_alternative_target);
618 __ mov(rscratch1, rscratch2);
619 __ str(zr, Address(rthread, in_bytes(JavaThread::jvmci_alternate_call_target_offset())));
620 __ bind(no_alternative_target);
621 }
622 #endif // INCLUDE_JVMCI
623
624 // Now generate the shuffle code.
625 for (int i = 0; i < total_args_passed; i++) {
626 if (sig_bt[i] == T_VOID) {
627 assert(i > 0 && (sig_bt[i-1] == T_LONG || sig_bt[i-1] == T_DOUBLE), "missing half");
628 continue;
629 }
630
631 // Pick up 0, 1 or 2 words from SP+offset.
632
633 assert(!regs[i].second()->is_valid() || regs[i].first()->next() == regs[i].second(),
634 "scrambled load targets?");
635 // Load in argument order going down.
636 int ld_off = (total_args_passed - i - 1)*Interpreter::stackElementSize;
637 // Point to interpreter value (vs. tag)
638 int next_off = ld_off - Interpreter::stackElementSize;
639 //
640 //
641 //
642 VMReg r_1 = regs[i].first();
643 VMReg r_2 = regs[i].second();
644 if (!r_1->is_valid()) {
645 assert(!r_2->is_valid(), "");
646 continue;
647 }
648 if (r_1->is_stack()) {
649 // Convert stack slot to an SP offset (+ wordSize to account for return address )
650 int st_off = regs[i].first()->reg2stack()*VMRegImpl::stack_slot_size;
651 if (!r_2->is_valid()) {
652 // sign extend???
653 __ ldrsw(rscratch2, Address(esp, ld_off));
654 __ str(rscratch2, Address(sp, st_off));
655 } else {
656 //
657 // We are using two optoregs. This can be either T_OBJECT,
658 // T_ADDRESS, T_LONG, or T_DOUBLE the interpreter allocates
659 // two slots but only uses one for thr T_LONG or T_DOUBLE case
660 // So we must adjust where to pick up the data to match the
661 // interpreter.
662 //
663 // Interpreter local[n] == MSW, local[n+1] == LSW however locals
664 // are accessed as negative so LSW is at LOW address
665
666 // ld_off is MSW so get LSW
667 const int offset = (sig_bt[i]==T_LONG||sig_bt[i]==T_DOUBLE)?
668 next_off : ld_off;
669 __ ldr(rscratch2, Address(esp, offset));
670 // st_off is LSW (i.e. reg.first())
671 __ str(rscratch2, Address(sp, st_off));
672 }
673 } else if (r_1->is_Register()) { // Register argument
674 Register r = r_1->as_Register();
675 if (r_2->is_valid()) {
676 //
677 // We are using two VMRegs. This can be either T_OBJECT,
678 // T_ADDRESS, T_LONG, or T_DOUBLE the interpreter allocates
679 // two slots but only uses one for thr T_LONG or T_DOUBLE case
680 // So we must adjust where to pick up the data to match the
681 // interpreter.
682
683 const int offset = (sig_bt[i]==T_LONG||sig_bt[i]==T_DOUBLE)?
684 next_off : ld_off;
685
686 // this can be a misaligned move
687 __ ldr(r, Address(esp, offset));
688 } else {
689 // sign extend and use a full word?
690 __ ldrw(r, Address(esp, ld_off));
691 }
692 } else {
693 if (!r_2->is_valid()) {
694 __ ldrs(r_1->as_FloatRegister(), Address(esp, ld_off));
695 } else {
696 __ ldrd(r_1->as_FloatRegister(), Address(esp, next_off));
697 }
698 }
699 }
700
701 __ mov(rscratch2, rscratch1);
702 __ push_cont_fastpath(rthread); // Set JavaThread::_cont_fastpath to the sp of the oldest interpreted frame we know about; kills rscratch1
703 __ mov(rscratch1, rscratch2);
704
705 // 6243940 We might end up in handle_wrong_method if
706 // the callee is deoptimized as we race thru here. If that
707 // happens we don't want to take a safepoint because the
708 // caller frame will look interpreted and arguments are now
709 // "compiled" so it is much better to make this transition
710 // invisible to the stack walking code. Unfortunately if
711 // we try and find the callee by normal means a safepoint
712 // is possible. So we stash the desired callee in the thread
713 // and the vm will find there should this case occur.
714
715 __ str(rmethod, Address(rthread, JavaThread::callee_target_offset()));
716
717 __ br(rscratch1);
718 }
719
720 // ---------------------------------------------------------------
721 AdapterHandlerEntry* SharedRuntime::generate_i2c2i_adapters(MacroAssembler *masm,
722 int total_args_passed,
723 int comp_args_on_stack,
724 const BasicType *sig_bt,
725 const VMRegPair *regs,
726 AdapterFingerPrint* fingerprint) {
727 address i2c_entry = __ pc();
728
729 gen_i2c_adapter(masm, total_args_passed, comp_args_on_stack, sig_bt, regs);
730
731 address c2i_unverified_entry = __ pc();
732 Label skip_fixup;
733
734 Label ok;
735
736 Register holder = rscratch2;
737 Register receiver = j_rarg0;
738 Register tmp = r10; // A call-clobbered register not used for arg passing
739
740 // -------------------------------------------------------------------------
741 // Generate a C2I adapter. On entry we know rmethod holds the Method* during calls
742 // to the interpreter. The args start out packed in the compiled layout. They
743 // need to be unpacked into the interpreter layout. This will almost always
744 // require some stack space. We grow the current (compiled) stack, then repack
745 // the args. We finally end in a jump to the generic interpreter entry point.
746 // On exit from the interpreter, the interpreter will restore our SP (lest the
747 // compiled code, which relies solely on SP and not FP, get sick).
748
749 {
750 __ block_comment("c2i_unverified_entry {");
751 __ load_klass(rscratch1, receiver);
752 __ ldr(tmp, Address(holder, CompiledICHolder::holder_klass_offset()));
753 __ cmp(rscratch1, tmp);
754 __ ldr(rmethod, Address(holder, CompiledICHolder::holder_metadata_offset()));
755 __ br(Assembler::EQ, ok);
756 __ far_jump(RuntimeAddress(SharedRuntime::get_ic_miss_stub()));
757
758 __ bind(ok);
759 // Method might have been compiled since the call site was patched to
760 // interpreted; if that is the case treat it as a miss so we can get
761 // the call site corrected.
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 = NULL;
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 __ flush();
795 return AdapterHandlerLibrary::new_entry(fingerprint, i2c_entry, c2i_entry, c2i_unverified_entry, c2i_no_clinit_check_entry);
796 }
797
798 static int c_calling_convention_priv(const BasicType *sig_bt,
799 VMRegPair *regs,
800 VMRegPair *regs2,
801 int total_args_passed) {
802 assert(regs2 == NULL, "not needed on AArch64");
803
804 // We return the amount of VMRegImpl stack slots we need to reserve for all
805 // the arguments NOT counting out_preserve_stack_slots.
806
807 static const Register INT_ArgReg[Argument::n_int_register_parameters_c] = {
808 c_rarg0, c_rarg1, c_rarg2, c_rarg3, c_rarg4, c_rarg5, c_rarg6, c_rarg7
809 };
810 static const FloatRegister FP_ArgReg[Argument::n_float_register_parameters_c] = {
811 c_farg0, c_farg1, c_farg2, c_farg3,
812 c_farg4, c_farg5, c_farg6, c_farg7
813 };
814
815 uint int_args = 0;
816 uint fp_args = 0;
817 uint stk_args = 0; // inc by 2 each time
818
819 for (int i = 0; i < total_args_passed; i++) {
820 switch (sig_bt[i]) {
821 case T_BOOLEAN:
822 case T_CHAR:
823 case T_BYTE:
824 case T_SHORT:
825 case T_INT:
826 if (int_args < Argument::n_int_register_parameters_c) {
827 regs[i].set1(INT_ArgReg[int_args++]->as_VMReg());
828 } else {
829 #ifdef __APPLE__
830 // Less-than word types are stored one after another.
831 // The code is unable to handle this so bailout.
832 return -1;
833 #endif
834 regs[i].set1(VMRegImpl::stack2reg(stk_args));
835 stk_args += 2;
836 }
837 break;
838 case T_LONG:
839 assert((i + 1) < total_args_passed && sig_bt[i + 1] == T_VOID, "expecting half");
840 // fall through
841 case T_OBJECT:
842 case T_ARRAY:
843 case T_ADDRESS:
844 case T_METADATA:
845 if (int_args < Argument::n_int_register_parameters_c) {
846 regs[i].set2(INT_ArgReg[int_args++]->as_VMReg());
847 } else {
848 regs[i].set2(VMRegImpl::stack2reg(stk_args));
849 stk_args += 2;
850 }
851 break;
852 case T_FLOAT:
853 if (fp_args < Argument::n_float_register_parameters_c) {
854 regs[i].set1(FP_ArgReg[fp_args++]->as_VMReg());
855 } else {
856 #ifdef __APPLE__
857 // Less-than word types are stored one after another.
858 // The code is unable to handle this so bailout.
859 return -1;
860 #endif
861 regs[i].set1(VMRegImpl::stack2reg(stk_args));
862 stk_args += 2;
863 }
864 break;
865 case T_DOUBLE:
866 assert((i + 1) < total_args_passed && sig_bt[i + 1] == T_VOID, "expecting half");
867 if (fp_args < Argument::n_float_register_parameters_c) {
868 regs[i].set2(FP_ArgReg[fp_args++]->as_VMReg());
869 } else {
870 regs[i].set2(VMRegImpl::stack2reg(stk_args));
871 stk_args += 2;
872 }
873 break;
874 case T_VOID: // Halves of longs and doubles
875 assert(i != 0 && (sig_bt[i - 1] == T_LONG || sig_bt[i - 1] == T_DOUBLE), "expecting half");
876 regs[i].set_bad();
877 break;
878 default:
879 ShouldNotReachHere();
880 break;
881 }
882 }
883
884 return stk_args;
885 }
886
887 int SharedRuntime::vector_calling_convention(VMRegPair *regs,
888 uint num_bits,
889 uint total_args_passed) {
890 Unimplemented();
891 return 0;
892 }
893
894 int SharedRuntime::c_calling_convention(const BasicType *sig_bt,
895 VMRegPair *regs,
896 VMRegPair *regs2,
897 int total_args_passed)
898 {
899 int result = c_calling_convention_priv(sig_bt, regs, regs2, total_args_passed);
900 guarantee(result >= 0, "Unsupported arguments configuration");
901 return result;
902 }
903
904
905 void SharedRuntime::save_native_result(MacroAssembler *masm, BasicType ret_type, int frame_slots) {
906 // We always ignore the frame_slots arg and just use the space just below frame pointer
907 // which by this time is free to use
908 switch (ret_type) {
909 case T_FLOAT:
910 __ strs(v0, Address(rfp, -wordSize));
911 break;
912 case T_DOUBLE:
913 __ strd(v0, Address(rfp, -wordSize));
914 break;
915 case T_VOID: break;
916 default: {
917 __ str(r0, Address(rfp, -wordSize));
918 }
919 }
920 }
921
922 void SharedRuntime::restore_native_result(MacroAssembler *masm, BasicType ret_type, int frame_slots) {
923 // We always ignore the frame_slots arg and just use the space just below frame pointer
924 // which by this time is free to use
925 switch (ret_type) {
926 case T_FLOAT:
927 __ ldrs(v0, Address(rfp, -wordSize));
928 break;
929 case T_DOUBLE:
930 __ ldrd(v0, Address(rfp, -wordSize));
931 break;
932 case T_VOID: break;
933 default: {
934 __ ldr(r0, Address(rfp, -wordSize));
935 }
936 }
937 }
938 static void save_args(MacroAssembler *masm, int arg_count, int first_arg, VMRegPair *args) {
939 RegSet x;
940 for ( int i = first_arg ; i < arg_count ; i++ ) {
941 if (args[i].first()->is_Register()) {
942 x = x + args[i].first()->as_Register();
943 } else if (args[i].first()->is_FloatRegister()) {
944 __ strd(args[i].first()->as_FloatRegister(), Address(__ pre(sp, -2 * wordSize)));
945 }
946 }
947 __ push(x, sp);
948 }
949
950 static void restore_args(MacroAssembler *masm, int arg_count, int first_arg, VMRegPair *args) {
951 RegSet x;
952 for ( int i = first_arg ; i < arg_count ; i++ ) {
953 if (args[i].first()->is_Register()) {
954 x = x + args[i].first()->as_Register();
955 } else {
956 ;
957 }
958 }
959 __ pop(x, sp);
960 for ( int i = arg_count - 1 ; i >= first_arg ; i-- ) {
961 if (args[i].first()->is_Register()) {
962 ;
963 } else if (args[i].first()->is_FloatRegister()) {
964 __ ldrd(args[i].first()->as_FloatRegister(), Address(__ post(sp, 2 * wordSize)));
965 }
966 }
967 }
968
969 static void verify_oop_args(MacroAssembler* masm,
970 const methodHandle& method,
971 const BasicType* sig_bt,
972 const VMRegPair* regs) {
973 Register temp_reg = r19; // not part of any compiled calling seq
974 if (VerifyOops) {
975 for (int i = 0; i < method->size_of_parameters(); i++) {
976 if (sig_bt[i] == T_OBJECT ||
977 sig_bt[i] == T_ARRAY) {
978 VMReg r = regs[i].first();
979 assert(r->is_valid(), "bad oop arg");
980 if (r->is_stack()) {
981 __ ldr(temp_reg, Address(sp, r->reg2stack() * VMRegImpl::stack_slot_size));
982 __ verify_oop(temp_reg);
983 } else {
984 __ verify_oop(r->as_Register());
985 }
986 }
987 }
988 }
989 }
990
991 // on exit, sp points to the ContinuationEntry
992 static OopMap* continuation_enter_setup(MacroAssembler* masm, int& stack_slots) {
993 assert(ContinuationEntry::size() % VMRegImpl::stack_slot_size == 0, "");
994 assert(in_bytes(ContinuationEntry::cont_offset()) % VMRegImpl::stack_slot_size == 0, "");
995 assert(in_bytes(ContinuationEntry::chunk_offset()) % VMRegImpl::stack_slot_size == 0, "");
996
997 stack_slots += (int)ContinuationEntry::size()/wordSize;
998 __ sub(sp, sp, (int)ContinuationEntry::size()); // place Continuation metadata
999
1000 OopMap* map = new OopMap(((int)ContinuationEntry::size() + wordSize)/ VMRegImpl::stack_slot_size, 0 /* arg_slots*/);
1001
1002 __ ldr(rscratch1, Address(rthread, JavaThread::cont_entry_offset()));
1003 __ str(rscratch1, Address(sp, ContinuationEntry::parent_offset()));
1004 __ mov(rscratch1, sp); // we can't use sp as the source in str
1005 __ str(rscratch1, Address(rthread, JavaThread::cont_entry_offset()));
1006
1007 return map;
1008 }
1009
1010 // on entry c_rarg1 points to the continuation
1011 // sp points to ContinuationEntry
1012 // c_rarg3 -- isVirtualThread
1013 static void fill_continuation_entry(MacroAssembler* masm) {
1014 #ifdef ASSERT
1015 __ movw(rscratch1, ContinuationEntry::cookie_value());
1016 __ strw(rscratch1, Address(sp, ContinuationEntry::cookie_offset()));
1017 #endif
1018
1019 __ str (c_rarg1, Address(sp, ContinuationEntry::cont_offset()));
1020 __ strw(c_rarg3, Address(sp, ContinuationEntry::flags_offset()));
1021 __ str (zr, Address(sp, ContinuationEntry::chunk_offset()));
1022 __ strw(zr, Address(sp, ContinuationEntry::argsize_offset()));
1023 __ strw(zr, Address(sp, ContinuationEntry::pin_count_offset()));
1024
1025 __ ldr(rscratch1, Address(rthread, JavaThread::cont_fastpath_offset()));
1026 __ str(rscratch1, Address(sp, ContinuationEntry::parent_cont_fastpath_offset()));
1027 __ ldr(rscratch1, Address(rthread, JavaThread::held_monitor_count_offset()));
1028 __ str(rscratch1, Address(sp, ContinuationEntry::parent_held_monitor_count_offset()));
1029
1030 __ str(zr, Address(rthread, JavaThread::cont_fastpath_offset()));
1031 __ str(zr, Address(rthread, JavaThread::held_monitor_count_offset()));
1032 }
1033
1034 // on entry, sp points to the ContinuationEntry
1035 // on exit, rfp points to the spilled rfp in the entry frame
1036 static void continuation_enter_cleanup(MacroAssembler* masm) {
1037 #ifndef PRODUCT
1038 Label OK;
1039 __ ldr(rscratch1, Address(rthread, JavaThread::cont_entry_offset()));
1040 __ cmp(sp, rscratch1);
1041 __ br(Assembler::EQ, OK);
1042 __ stop("incorrect sp1");
1043 __ bind(OK);
1044 #endif
1045
1046 __ ldr(rscratch1, Address(sp, ContinuationEntry::parent_cont_fastpath_offset()));
1047 __ str(rscratch1, Address(rthread, JavaThread::cont_fastpath_offset()));
1048 __ ldr(rscratch1, Address(sp, ContinuationEntry::parent_held_monitor_count_offset()));
1049 __ str(rscratch1, Address(rthread, JavaThread::held_monitor_count_offset()));
1050
1051 __ ldr(rscratch2, Address(sp, ContinuationEntry::parent_offset()));
1052 __ str(rscratch2, Address(rthread, JavaThread::cont_entry_offset()));
1053 __ add(rfp, sp, (int)ContinuationEntry::size());
1054 }
1055
1056 // enterSpecial(Continuation c, boolean isContinue, boolean isVirtualThread)
1057 // On entry: c_rarg1 -- the continuation object
1058 // c_rarg2 -- isContinue
1059 // c_rarg3 -- isVirtualThread
1060 static void gen_continuation_enter(MacroAssembler* masm,
1061 const methodHandle& method,
1062 const BasicType* sig_bt,
1063 const VMRegPair* regs,
1064 int& exception_offset,
1065 OopMapSet*oop_maps,
1066 int& frame_complete,
1067 int& stack_slots,
1068 int& interpreted_entry_offset,
1069 int& compiled_entry_offset) {
1070 //verify_oop_args(masm, method, sig_bt, regs);
1071 Address resolve(SharedRuntime::get_resolve_static_call_stub(), relocInfo::static_call_type);
1072
1073 address start = __ pc();
1074
1075 Label call_thaw, exit;
1076
1077 // i2i entry used at interp_only_mode only
1078 interpreted_entry_offset = __ pc() - start;
1079 {
1080
1081 #ifdef ASSERT
1082 Label is_interp_only;
1083 __ ldrw(rscratch1, Address(rthread, JavaThread::interp_only_mode_offset()));
1084 __ cbnzw(rscratch1, is_interp_only);
1085 __ stop("enterSpecial interpreter entry called when not in interp_only_mode");
1086 __ bind(is_interp_only);
1087 #endif
1088
1089 // Read interpreter arguments into registers (this is an ad-hoc i2c adapter)
1090 __ ldr(c_rarg1, Address(esp, Interpreter::stackElementSize*2));
1091 __ ldr(c_rarg2, Address(esp, Interpreter::stackElementSize*1));
1092 __ ldr(c_rarg3, Address(esp, Interpreter::stackElementSize*0));
1093 __ push_cont_fastpath(rthread);
1094
1095 __ enter();
1096 stack_slots = 2; // will be adjusted in setup
1097 OopMap* map = continuation_enter_setup(masm, stack_slots);
1098 // The frame is complete here, but we only record it for the compiled entry, so the frame would appear unsafe,
1099 // but that's okay because at the very worst we'll miss an async sample, but we're in interp_only_mode anyway.
1100
1101 fill_continuation_entry(masm);
1102
1103 __ cbnz(c_rarg2, call_thaw);
1104
1105 const address tr_call = __ trampoline_call(resolve);
1106 if (tr_call == nullptr) {
1107 fatal("CodeCache is full at gen_continuation_enter");
1108 }
1109
1110 oop_maps->add_gc_map(__ pc() - start, map);
1111 __ post_call_nop();
1112
1113 __ b(exit);
1114
1115 CodeBuffer* cbuf = masm->code_section()->outer();
1116 address stub = CompiledStaticCall::emit_to_interp_stub(*cbuf, tr_call);
1117 if (stub == nullptr) {
1118 fatal("CodeCache is full at gen_continuation_enter");
1119 }
1120 }
1121
1122 // compiled entry
1123 __ align(CodeEntryAlignment);
1124 compiled_entry_offset = __ pc() - start;
1125
1126 __ enter();
1127 stack_slots = 2; // will be adjusted in setup
1128 OopMap* map = continuation_enter_setup(masm, stack_slots);
1129 frame_complete = __ pc() - start;
1130
1131 fill_continuation_entry(masm);
1132
1133 __ cbnz(c_rarg2, call_thaw);
1134
1135 const address tr_call = __ trampoline_call(resolve);
1136 if (tr_call == nullptr) {
1137 fatal("CodeCache is full at gen_continuation_enter");
1138 }
1139
1140 oop_maps->add_gc_map(__ pc() - start, map);
1141 __ post_call_nop();
1142
1143 __ b(exit);
1144
1145 __ bind(call_thaw);
1146
1147 __ rt_call(CAST_FROM_FN_PTR(address, StubRoutines::cont_thaw()));
1148 oop_maps->add_gc_map(__ pc() - start, map->deep_copy());
1149 ContinuationEntry::_return_pc_offset = __ pc() - start;
1150 __ post_call_nop();
1151
1152 __ bind(exit);
1153 continuation_enter_cleanup(masm);
1154 __ leave();
1155 __ ret(lr);
1156
1157 /// exception handling
1158
1159 exception_offset = __ pc() - start;
1160 {
1161 __ mov(r19, r0); // save return value contaning the exception oop in callee-saved R19
1162
1163 continuation_enter_cleanup(masm);
1164
1165 __ ldr(c_rarg1, Address(rfp, wordSize)); // return address
1166 __ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::exception_handler_for_return_address), rthread, c_rarg1);
1167
1168 // see OptoRuntime::generate_exception_blob: r0 -- exception oop, r3 -- exception pc
1169
1170 __ mov(r1, r0); // the exception handler
1171 __ mov(r0, r19); // restore return value contaning the exception oop
1172 __ verify_oop(r0);
1173
1174 __ leave();
1175 __ mov(r3, lr);
1176 __ br(r1); // the exception handler
1177 }
1178
1179 CodeBuffer* cbuf = masm->code_section()->outer();
1180 address stub = CompiledStaticCall::emit_to_interp_stub(*cbuf, tr_call);
1181 if (stub == nullptr) {
1182 fatal("CodeCache is full at gen_continuation_enter");
1183 }
1184 }
1185
1186 static void gen_continuation_yield(MacroAssembler* masm,
1187 const methodHandle& method,
1188 const BasicType* sig_bt,
1189 const VMRegPair* regs,
1190 OopMapSet* oop_maps,
1191 int& frame_complete,
1192 int& stack_slots,
1193 int& compiled_entry_offset) {
1194 enum layout {
1195 rfp_off1,
1196 rfp_off2,
1197 lr_off,
1198 lr_off2,
1199 framesize // inclusive of return address
1200 };
1201 // assert(is_even(framesize/2), "sp not 16-byte aligned");
1202 stack_slots = framesize / VMRegImpl::slots_per_word;
1203 assert(stack_slots == 2, "recheck layout");
1204
1205 address start = __ pc();
1206
1207 compiled_entry_offset = __ pc() - start;
1208 __ enter();
1209
1210 __ mov(c_rarg1, sp);
1211
1212 frame_complete = __ pc() - start;
1213 address the_pc = __ pc();
1214
1215 __ 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
1216
1217 __ mov(c_rarg0, rthread);
1218 __ set_last_Java_frame(sp, rfp, the_pc, rscratch1);
1219 __ call_VM_leaf(Continuation::freeze_entry(), 2);
1220 __ reset_last_Java_frame(true);
1221
1222 Label pinned;
1223
1224 __ cbnz(r0, pinned);
1225
1226 // We've succeeded, set sp to the ContinuationEntry
1227 __ ldr(rscratch1, Address(rthread, JavaThread::cont_entry_offset()));
1228 __ mov(sp, rscratch1);
1229 continuation_enter_cleanup(masm);
1230
1231 __ bind(pinned); // pinned -- return to caller
1232
1233 // handle pending exception thrown by freeze
1234 __ ldr(rscratch1, Address(rthread, in_bytes(Thread::pending_exception_offset())));
1235 Label ok;
1236 __ cbz(rscratch1, ok);
1237 __ leave();
1238 __ lea(rscratch1, RuntimeAddress(StubRoutines::forward_exception_entry()));
1239 __ br(rscratch1);
1240 __ bind(ok);
1241
1242 __ leave();
1243 __ ret(lr);
1244
1245 OopMap* map = new OopMap(framesize, 1);
1246 oop_maps->add_gc_map(the_pc - start, map);
1247 }
1248
1249 static void gen_special_dispatch(MacroAssembler* masm,
1250 const methodHandle& method,
1251 const BasicType* sig_bt,
1252 const VMRegPair* regs) {
1253 verify_oop_args(masm, method, sig_bt, regs);
1254 vmIntrinsics::ID iid = method->intrinsic_id();
1255
1256 // Now write the args into the outgoing interpreter space
1257 bool has_receiver = false;
1258 Register receiver_reg = noreg;
1259 int member_arg_pos = -1;
1260 Register member_reg = noreg;
1261 int ref_kind = MethodHandles::signature_polymorphic_intrinsic_ref_kind(iid);
1262 if (ref_kind != 0) {
1263 member_arg_pos = method->size_of_parameters() - 1; // trailing MemberName argument
1264 member_reg = r19; // known to be free at this point
1265 has_receiver = MethodHandles::ref_kind_has_receiver(ref_kind);
1266 } else if (iid == vmIntrinsics::_invokeBasic) {
1267 has_receiver = true;
1268 } else if (iid == vmIntrinsics::_linkToNative) {
1269 member_arg_pos = method->size_of_parameters() - 1; // trailing NativeEntryPoint argument
1270 member_reg = r19; // known to be free at this point
1271 } else {
1272 fatal("unexpected intrinsic id %d", vmIntrinsics::as_int(iid));
1273 }
1274
1275 if (member_reg != noreg) {
1276 // Load the member_arg into register, if necessary.
1277 SharedRuntime::check_member_name_argument_is_last_argument(method, sig_bt, regs);
1278 VMReg r = regs[member_arg_pos].first();
1279 if (r->is_stack()) {
1280 __ ldr(member_reg, Address(sp, r->reg2stack() * VMRegImpl::stack_slot_size));
1281 } else {
1282 // no data motion is needed
1283 member_reg = r->as_Register();
1284 }
1285 }
1286
1287 if (has_receiver) {
1288 // Make sure the receiver is loaded into a register.
1289 assert(method->size_of_parameters() > 0, "oob");
1290 assert(sig_bt[0] == T_OBJECT, "receiver argument must be an object");
1291 VMReg r = regs[0].first();
1292 assert(r->is_valid(), "bad receiver arg");
1293 if (r->is_stack()) {
1294 // Porting note: This assumes that compiled calling conventions always
1295 // pass the receiver oop in a register. If this is not true on some
1296 // platform, pick a temp and load the receiver from stack.
1297 fatal("receiver always in a register");
1298 receiver_reg = r2; // known to be free at this point
1299 __ ldr(receiver_reg, Address(sp, r->reg2stack() * VMRegImpl::stack_slot_size));
1300 } else {
1301 // no data motion is needed
1302 receiver_reg = r->as_Register();
1303 }
1304 }
1305
1306 // Figure out which address we are really jumping to:
1307 MethodHandles::generate_method_handle_dispatch(masm, iid,
1308 receiver_reg, member_reg, /*for_compiler_entry:*/ true);
1309 }
1310
1311 // ---------------------------------------------------------------------------
1312 // Generate a native wrapper for a given method. The method takes arguments
1313 // in the Java compiled code convention, marshals them to the native
1314 // convention (handlizes oops, etc), transitions to native, makes the call,
1315 // returns to java state (possibly blocking), unhandlizes any result and
1316 // returns.
1317 //
1318 // Critical native functions are a shorthand for the use of
1319 // GetPrimtiveArrayCritical and disallow the use of any other JNI
1320 // functions. The wrapper is expected to unpack the arguments before
1321 // passing them to the callee. Critical native functions leave the state _in_Java,
1322 // since they block out GC.
1323 // Some other parts of JNI setup are skipped like the tear down of the JNI handle
1324 // block and the check for pending exceptions it's impossible for them
1325 // to be thrown.
1326 //
1327 nmethod* SharedRuntime::generate_native_wrapper(MacroAssembler* masm,
1328 const methodHandle& method,
1329 int compile_id,
1330 BasicType* in_sig_bt,
1331 VMRegPair* in_regs,
1332 BasicType ret_type) {
1333 if (method->is_continuation_native_intrinsic()) {
1334 int exception_offset = -1;
1335 OopMapSet* oop_maps = new OopMapSet();
1336 int frame_complete = -1;
1337 int stack_slots = -1;
1338 int interpreted_entry_offset = -1;
1339 int vep_offset = -1;
1340 if (method->is_continuation_enter_intrinsic()) {
1341 gen_continuation_enter(masm,
1342 method,
1343 in_sig_bt,
1344 in_regs,
1345 exception_offset,
1346 oop_maps,
1347 frame_complete,
1348 stack_slots,
1349 interpreted_entry_offset,
1350 vep_offset);
1351 } else if (method->is_continuation_yield_intrinsic()) {
1352 gen_continuation_yield(masm,
1353 method,
1354 in_sig_bt,
1355 in_regs,
1356 oop_maps,
1357 frame_complete,
1358 stack_slots,
1359 vep_offset);
1360 } else {
1361 guarantee(false, "Unknown Continuation native intrinsic");
1362 }
1363
1364 #ifdef ASSERT
1365 if (method->is_continuation_enter_intrinsic()) {
1366 assert(interpreted_entry_offset != -1, "Must be set");
1367 assert(exception_offset != -1, "Must be set");
1368 } else {
1369 assert(interpreted_entry_offset == -1, "Must be unset");
1370 assert(exception_offset == -1, "Must be unset");
1371 }
1372 assert(frame_complete != -1, "Must be set");
1373 assert(stack_slots != -1, "Must be set");
1374 assert(vep_offset != -1, "Must be set");
1375 #endif
1376
1377 __ flush();
1378 nmethod* nm = nmethod::new_native_nmethod(method,
1379 compile_id,
1380 masm->code(),
1381 vep_offset,
1382 frame_complete,
1383 stack_slots,
1384 in_ByteSize(-1),
1385 in_ByteSize(-1),
1386 oop_maps,
1387 exception_offset);
1388 if (method->is_continuation_enter_intrinsic()) {
1389 ContinuationEntry::set_enter_code(nm, interpreted_entry_offset);
1390 } else if (method->is_continuation_yield_intrinsic()) {
1391 _cont_doYield_stub = nm;
1392 } else {
1393 guarantee(false, "Unknown Continuation native intrinsic");
1394 }
1395 return nm;
1396 }
1397
1398 if (method->is_method_handle_intrinsic()) {
1399 vmIntrinsics::ID iid = method->intrinsic_id();
1400 intptr_t start = (intptr_t)__ pc();
1401 int vep_offset = ((intptr_t)__ pc()) - start;
1402
1403 // First instruction must be a nop as it may need to be patched on deoptimisation
1404 __ nop();
1405 gen_special_dispatch(masm,
1406 method,
1407 in_sig_bt,
1408 in_regs);
1409 int frame_complete = ((intptr_t)__ pc()) - start; // not complete, period
1410 __ flush();
1411 int stack_slots = SharedRuntime::out_preserve_stack_slots(); // no out slots at all, actually
1412 return nmethod::new_native_nmethod(method,
1413 compile_id,
1414 masm->code(),
1415 vep_offset,
1416 frame_complete,
1417 stack_slots / VMRegImpl::slots_per_word,
1418 in_ByteSize(-1),
1419 in_ByteSize(-1),
1420 (OopMapSet*)NULL);
1421 }
1422 address native_func = method->native_function();
1423 assert(native_func != NULL, "must have function");
1424
1425 // An OopMap for lock (and class if static)
1426 OopMapSet *oop_maps = new OopMapSet();
1427 intptr_t start = (intptr_t)__ pc();
1428
1429 // We have received a description of where all the java arg are located
1430 // on entry to the wrapper. We need to convert these args to where
1431 // the jni function will expect them. To figure out where they go
1432 // we convert the java signature to a C signature by inserting
1433 // the hidden arguments as arg[0] and possibly arg[1] (static method)
1434
1435 const int total_in_args = method->size_of_parameters();
1436 int total_c_args = total_in_args + (method->is_static() ? 2 : 1);
1437
1438 BasicType* out_sig_bt = NEW_RESOURCE_ARRAY(BasicType, total_c_args);
1439 VMRegPair* out_regs = NEW_RESOURCE_ARRAY(VMRegPair, total_c_args);
1440 BasicType* in_elem_bt = NULL;
1441
1442 int argc = 0;
1443 out_sig_bt[argc++] = T_ADDRESS;
1444 if (method->is_static()) {
1445 out_sig_bt[argc++] = T_OBJECT;
1446 }
1447
1448 for (int i = 0; i < total_in_args ; i++ ) {
1449 out_sig_bt[argc++] = in_sig_bt[i];
1450 }
1451
1452 // Now figure out where the args must be stored and how much stack space
1453 // they require.
1454 int out_arg_slots;
1455 out_arg_slots = c_calling_convention_priv(out_sig_bt, out_regs, NULL, total_c_args);
1456
1457 if (out_arg_slots < 0) {
1458 return NULL;
1459 }
1460
1461 // Compute framesize for the wrapper. We need to handlize all oops in
1462 // incoming registers
1463
1464 // Calculate the total number of stack slots we will need.
1465
1466 // First count the abi requirement plus all of the outgoing args
1467 int stack_slots = SharedRuntime::out_preserve_stack_slots() + out_arg_slots;
1468
1469 // Now the space for the inbound oop handle area
1470 int total_save_slots = 8 * VMRegImpl::slots_per_word; // 8 arguments passed in registers
1471
1472 int oop_handle_offset = stack_slots;
1473 stack_slots += total_save_slots;
1474
1475 // Now any space we need for handlizing a klass if static method
1476
1477 int klass_slot_offset = 0;
1478 int klass_offset = -1;
1479 int lock_slot_offset = 0;
1480 bool is_static = false;
1481
1482 if (method->is_static()) {
1483 klass_slot_offset = stack_slots;
1484 stack_slots += VMRegImpl::slots_per_word;
1485 klass_offset = klass_slot_offset * VMRegImpl::stack_slot_size;
1486 is_static = true;
1487 }
1488
1489 // Plus a lock if needed
1490
1491 if (method->is_synchronized()) {
1492 lock_slot_offset = stack_slots;
1493 stack_slots += VMRegImpl::slots_per_word;
1494 }
1495
1496 // Now a place (+2) to save return values or temp during shuffling
1497 // + 4 for return address (which we own) and saved rfp
1498 stack_slots += 6;
1499
1500 // Ok The space we have allocated will look like:
1501 //
1502 //
1503 // FP-> | |
1504 // |---------------------|
1505 // | 2 slots for moves |
1506 // |---------------------|
1507 // | lock box (if sync) |
1508 // |---------------------| <- lock_slot_offset
1509 // | klass (if static) |
1510 // |---------------------| <- klass_slot_offset
1511 // | oopHandle area |
1512 // |---------------------| <- oop_handle_offset (8 java arg registers)
1513 // | outbound memory |
1514 // | based arguments |
1515 // | |
1516 // |---------------------|
1517 // | |
1518 // SP-> | out_preserved_slots |
1519 //
1520 //
1521
1522
1523 // Now compute actual number of stack words we need rounding to make
1524 // stack properly aligned.
1525 stack_slots = align_up(stack_slots, StackAlignmentInSlots);
1526
1527 int stack_size = stack_slots * VMRegImpl::stack_slot_size;
1528
1529 // First thing make an ic check to see if we should even be here
1530
1531 // We are free to use all registers as temps without saving them and
1532 // restoring them except rfp. rfp is the only callee save register
1533 // as far as the interpreter and the compiler(s) are concerned.
1534
1535
1536 const Register ic_reg = rscratch2;
1537 const Register receiver = j_rarg0;
1538
1539 Label hit;
1540 Label exception_pending;
1541
1542 assert_different_registers(ic_reg, receiver, rscratch1);
1543 __ verify_oop(receiver);
1544 __ cmp_klass(receiver, ic_reg, rscratch1);
1545 __ br(Assembler::EQ, hit);
1546
1547 __ far_jump(RuntimeAddress(SharedRuntime::get_ic_miss_stub()));
1548
1549 // Verified entry point must be aligned
1550 __ align(8);
1551
1552 __ bind(hit);
1553
1554 int vep_offset = ((intptr_t)__ pc()) - start;
1555
1556 // If we have to make this method not-entrant we'll overwrite its
1557 // first instruction with a jump. For this action to be legal we
1558 // must ensure that this first instruction is a B, BL, NOP, BKPT,
1559 // SVC, HVC, or SMC. Make it a NOP.
1560 __ nop();
1561
1562 if (VM_Version::supports_fast_class_init_checks() && method->needs_clinit_barrier()) {
1563 Label L_skip_barrier;
1564 __ mov_metadata(rscratch2, method->method_holder()); // InstanceKlass*
1565 __ clinit_barrier(rscratch2, rscratch1, &L_skip_barrier);
1566 __ far_jump(RuntimeAddress(SharedRuntime::get_handle_wrong_method_stub()));
1567
1568 __ bind(L_skip_barrier);
1569 }
1570
1571 // Generate stack overflow check
1572 __ bang_stack_with_offset(checked_cast<int>(StackOverflow::stack_shadow_zone_size()));
1573
1574 // Generate a new frame for the wrapper.
1575 __ enter();
1576 // -2 because return address is already present and so is saved rfp
1577 __ sub(sp, sp, stack_size - 2*wordSize);
1578
1579 BarrierSetAssembler* bs = BarrierSet::barrier_set()->barrier_set_assembler();
1580 bs->nmethod_entry_barrier(masm, NULL /* slow_path */, NULL /* continuation */, NULL /* guard */);
1581
1582 // Frame is now completed as far as size and linkage.
1583 int frame_complete = ((intptr_t)__ pc()) - start;
1584
1585 // We use r20 as the oop handle for the receiver/klass
1586 // It is callee save so it survives the call to native
1587
1588 const Register oop_handle_reg = r20;
1589
1590 //
1591 // We immediately shuffle the arguments so that any vm call we have to
1592 // make from here on out (sync slow path, jvmti, etc.) we will have
1593 // captured the oops from our caller and have a valid oopMap for
1594 // them.
1595
1596 // -----------------
1597 // The Grand Shuffle
1598
1599 // The Java calling convention is either equal (linux) or denser (win64) than the
1600 // c calling convention. However the because of the jni_env argument the c calling
1601 // convention always has at least one more (and two for static) arguments than Java.
1602 // Therefore if we move the args from java -> c backwards then we will never have
1603 // a register->register conflict and we don't have to build a dependency graph
1604 // and figure out how to break any cycles.
1605 //
1606
1607 // Record esp-based slot for receiver on stack for non-static methods
1608 int receiver_offset = -1;
1609
1610 // This is a trick. We double the stack slots so we can claim
1611 // the oops in the caller's frame. Since we are sure to have
1612 // more args than the caller doubling is enough to make
1613 // sure we can capture all the incoming oop args from the
1614 // caller.
1615 //
1616 OopMap* map = new OopMap(stack_slots * 2, 0 /* arg_slots*/);
1617
1618 // Mark location of rfp (someday)
1619 // map->set_callee_saved(VMRegImpl::stack2reg( stack_slots - 2), stack_slots * 2, 0, vmreg(rfp));
1620
1621
1622 int float_args = 0;
1623 int int_args = 0;
1624
1625 #ifdef ASSERT
1626 bool reg_destroyed[Register::number_of_registers];
1627 bool freg_destroyed[FloatRegister::number_of_registers];
1628 for ( int r = 0 ; r < Register::number_of_registers ; r++ ) {
1629 reg_destroyed[r] = false;
1630 }
1631 for ( int f = 0 ; f < FloatRegister::number_of_registers ; f++ ) {
1632 freg_destroyed[f] = false;
1633 }
1634
1635 #endif /* ASSERT */
1636
1637 // For JNI natives the incoming and outgoing registers are offset upwards.
1638 GrowableArray<int> arg_order(2 * total_in_args);
1639 VMRegPair tmp_vmreg;
1640 tmp_vmreg.set2(r19->as_VMReg());
1641
1642 for (int i = total_in_args - 1, c_arg = total_c_args - 1; i >= 0; i--, c_arg--) {
1643 arg_order.push(i);
1644 arg_order.push(c_arg);
1645 }
1646
1647 int temploc = -1;
1648 for (int ai = 0; ai < arg_order.length(); ai += 2) {
1649 int i = arg_order.at(ai);
1650 int c_arg = arg_order.at(ai + 1);
1651 __ block_comment(err_msg("move %d -> %d", i, c_arg));
1652 assert(c_arg != -1 && i != -1, "wrong order");
1653 #ifdef ASSERT
1654 if (in_regs[i].first()->is_Register()) {
1655 assert(!reg_destroyed[in_regs[i].first()->as_Register()->encoding()], "destroyed reg!");
1656 } else if (in_regs[i].first()->is_FloatRegister()) {
1657 assert(!freg_destroyed[in_regs[i].first()->as_FloatRegister()->encoding()], "destroyed reg!");
1658 }
1659 if (out_regs[c_arg].first()->is_Register()) {
1660 reg_destroyed[out_regs[c_arg].first()->as_Register()->encoding()] = true;
1661 } else if (out_regs[c_arg].first()->is_FloatRegister()) {
1662 freg_destroyed[out_regs[c_arg].first()->as_FloatRegister()->encoding()] = true;
1663 }
1664 #endif /* ASSERT */
1665 switch (in_sig_bt[i]) {
1666 case T_ARRAY:
1667 case T_OBJECT:
1668 __ object_move(map, oop_handle_offset, stack_slots, in_regs[i], out_regs[c_arg],
1669 ((i == 0) && (!is_static)),
1670 &receiver_offset);
1671 int_args++;
1672 break;
1673 case T_VOID:
1674 break;
1675
1676 case T_FLOAT:
1677 __ float_move(in_regs[i], out_regs[c_arg]);
1678 float_args++;
1679 break;
1680
1681 case T_DOUBLE:
1682 assert( i + 1 < total_in_args &&
1683 in_sig_bt[i + 1] == T_VOID &&
1684 out_sig_bt[c_arg+1] == T_VOID, "bad arg list");
1685 __ double_move(in_regs[i], out_regs[c_arg]);
1686 float_args++;
1687 break;
1688
1689 case T_LONG :
1690 __ long_move(in_regs[i], out_regs[c_arg]);
1691 int_args++;
1692 break;
1693
1694 case T_ADDRESS: assert(false, "found T_ADDRESS in java args");
1695
1696 default:
1697 __ move32_64(in_regs[i], out_regs[c_arg]);
1698 int_args++;
1699 }
1700 }
1701
1702 // point c_arg at the first arg that is already loaded in case we
1703 // need to spill before we call out
1704 int c_arg = total_c_args - total_in_args;
1705
1706 // Pre-load a static method's oop into c_rarg1.
1707 if (method->is_static()) {
1708
1709 // load oop into a register
1710 __ movoop(c_rarg1,
1711 JNIHandles::make_local(method->method_holder()->java_mirror()));
1712
1713 // Now handlize the static class mirror it's known not-null.
1714 __ str(c_rarg1, Address(sp, klass_offset));
1715 map->set_oop(VMRegImpl::stack2reg(klass_slot_offset));
1716
1717 // Now get the handle
1718 __ lea(c_rarg1, Address(sp, klass_offset));
1719 // and protect the arg if we must spill
1720 c_arg--;
1721 }
1722
1723 // Change state to native (we save the return address in the thread, since it might not
1724 // be pushed on the stack when we do a stack traversal).
1725 // We use the same pc/oopMap repeatedly when we call out
1726
1727 Label native_return;
1728 __ set_last_Java_frame(sp, noreg, native_return, rscratch1);
1729
1730 Label dtrace_method_entry, dtrace_method_entry_done;
1731 {
1732 uint64_t offset;
1733 __ adrp(rscratch1, ExternalAddress((address)&DTraceMethodProbes), offset);
1734 __ ldrb(rscratch1, Address(rscratch1, offset));
1735 __ cbnzw(rscratch1, dtrace_method_entry);
1736 __ bind(dtrace_method_entry_done);
1737 }
1738
1739 // RedefineClasses() tracing support for obsolete method entry
1740 if (log_is_enabled(Trace, redefine, class, obsolete)) {
1741 // protect the args we've loaded
1742 save_args(masm, total_c_args, c_arg, out_regs);
1743 __ mov_metadata(c_rarg1, method());
1744 __ call_VM_leaf(
1745 CAST_FROM_FN_PTR(address, SharedRuntime::rc_trace_method_entry),
1746 rthread, c_rarg1);
1747 restore_args(masm, total_c_args, c_arg, out_regs);
1748 }
1749
1750 // Lock a synchronized method
1751
1752 // Register definitions used by locking and unlocking
1753
1754 const Register swap_reg = r0;
1755 const Register obj_reg = r19; // Will contain the oop
1756 const Register lock_reg = r13; // Address of compiler lock object (BasicLock)
1757 const Register old_hdr = r13; // value of old header at unlock time
1758 const Register tmp = lr;
1759
1760 Label slow_path_lock;
1761 Label lock_done;
1762
1763 if (method->is_synchronized()) {
1764 Label count;
1765 const int mark_word_offset = BasicLock::displaced_header_offset_in_bytes();
1766
1767 // Get the handle (the 2nd argument)
1768 __ mov(oop_handle_reg, c_rarg1);
1769
1770 // Get address of the box
1771
1772 __ lea(lock_reg, Address(sp, lock_slot_offset * VMRegImpl::stack_slot_size));
1773
1774 // Load the oop from the handle
1775 __ ldr(obj_reg, Address(oop_handle_reg, 0));
1776
1777 if (!UseHeavyMonitors) {
1778 // Load (object->mark() | 1) into swap_reg %r0
1779 __ ldr(rscratch1, Address(obj_reg, oopDesc::mark_offset_in_bytes()));
1780 __ orr(swap_reg, rscratch1, 1);
1781
1782 // Save (object->mark() | 1) into BasicLock's displaced header
1783 __ str(swap_reg, Address(lock_reg, mark_word_offset));
1784
1785 // src -> dest iff dest == r0 else r0 <- dest
1786 __ cmpxchg_obj_header(r0, lock_reg, obj_reg, rscratch1, count, /*fallthrough*/NULL);
1787
1788 // Hmm should this move to the slow path code area???
1789
1790 // Test if the oopMark is an obvious stack pointer, i.e.,
1791 // 1) (mark & 3) == 0, and
1792 // 2) sp <= mark < mark + os::pagesize()
1793 // These 3 tests can be done by evaluating the following
1794 // expression: ((mark - sp) & (3 - os::vm_page_size())),
1795 // assuming both stack pointer and pagesize have their
1796 // least significant 2 bits clear.
1797 // NOTE: the oopMark is in swap_reg %r0 as the result of cmpxchg
1798
1799 __ sub(swap_reg, sp, swap_reg);
1800 __ neg(swap_reg, swap_reg);
1801 __ ands(swap_reg, swap_reg, 3 - (int)os::vm_page_size());
1802
1803 // Save the test result, for recursive case, the result is zero
1804 __ str(swap_reg, Address(lock_reg, mark_word_offset));
1805 __ br(Assembler::NE, slow_path_lock);
1806 } else {
1807 __ b(slow_path_lock);
1808 }
1809 __ bind(count);
1810 __ increment(Address(rthread, JavaThread::held_monitor_count_offset()));
1811
1812 // Slow path will re-enter here
1813 __ bind(lock_done);
1814 }
1815
1816
1817 // Finally just about ready to make the JNI call
1818
1819 // get JNIEnv* which is first argument to native
1820 __ lea(c_rarg0, Address(rthread, in_bytes(JavaThread::jni_environment_offset())));
1821
1822 // Now set thread in native
1823 __ mov(rscratch1, _thread_in_native);
1824 __ lea(rscratch2, Address(rthread, JavaThread::thread_state_offset()));
1825 __ stlrw(rscratch1, rscratch2);
1826
1827 __ rt_call(native_func);
1828
1829 __ bind(native_return);
1830
1831 intptr_t return_pc = (intptr_t) __ pc();
1832 oop_maps->add_gc_map(return_pc - start, map);
1833
1834 // Unpack native results.
1835 switch (ret_type) {
1836 case T_BOOLEAN: __ c2bool(r0); break;
1837 case T_CHAR : __ ubfx(r0, r0, 0, 16); break;
1838 case T_BYTE : __ sbfx(r0, r0, 0, 8); break;
1839 case T_SHORT : __ sbfx(r0, r0, 0, 16); break;
1840 case T_INT : __ sbfx(r0, r0, 0, 32); break;
1841 case T_DOUBLE :
1842 case T_FLOAT :
1843 // Result is in v0 we'll save as needed
1844 break;
1845 case T_ARRAY: // Really a handle
1846 case T_OBJECT: // Really a handle
1847 break; // can't de-handlize until after safepoint check
1848 case T_VOID: break;
1849 case T_LONG: break;
1850 default : ShouldNotReachHere();
1851 }
1852
1853 Label safepoint_in_progress, safepoint_in_progress_done;
1854 Label after_transition;
1855
1856 // Switch thread to "native transition" state before reading the synchronization state.
1857 // This additional state is necessary because reading and testing the synchronization
1858 // state is not atomic w.r.t. GC, as this scenario demonstrates:
1859 // Java thread A, in _thread_in_native state, loads _not_synchronized and is preempted.
1860 // VM thread changes sync state to synchronizing and suspends threads for GC.
1861 // Thread A is resumed to finish this native method, but doesn't block here since it
1862 // didn't see any synchronization is progress, and escapes.
1863 __ mov(rscratch1, _thread_in_native_trans);
1864
1865 __ strw(rscratch1, Address(rthread, JavaThread::thread_state_offset()));
1866
1867 // Force this write out before the read below
1868 if (!UseSystemMemoryBarrier) {
1869 __ dmb(Assembler::ISH);
1870 }
1871
1872 __ verify_sve_vector_length();
1873
1874 // Check for safepoint operation in progress and/or pending suspend requests.
1875 {
1876 // We need an acquire here to ensure that any subsequent load of the
1877 // global SafepointSynchronize::_state flag is ordered after this load
1878 // of the thread-local polling word. We don't want this poll to
1879 // return false (i.e. not safepointing) and a later poll of the global
1880 // SafepointSynchronize::_state spuriously to return true.
1881 //
1882 // This is to avoid a race when we're in a native->Java transition
1883 // racing the code which wakes up from a safepoint.
1884
1885 __ safepoint_poll(safepoint_in_progress, true /* at_return */, true /* acquire */, false /* in_nmethod */);
1886 __ ldrw(rscratch1, Address(rthread, JavaThread::suspend_flags_offset()));
1887 __ cbnzw(rscratch1, safepoint_in_progress);
1888 __ bind(safepoint_in_progress_done);
1889 }
1890
1891 // change thread state
1892 __ mov(rscratch1, _thread_in_Java);
1893 __ lea(rscratch2, Address(rthread, JavaThread::thread_state_offset()));
1894 __ stlrw(rscratch1, rscratch2);
1895 __ bind(after_transition);
1896
1897 Label reguard;
1898 Label reguard_done;
1899 __ ldrb(rscratch1, Address(rthread, JavaThread::stack_guard_state_offset()));
1900 __ cmpw(rscratch1, StackOverflow::stack_guard_yellow_reserved_disabled);
1901 __ br(Assembler::EQ, reguard);
1902 __ bind(reguard_done);
1903
1904 // native result if any is live
1905
1906 // Unlock
1907 Label unlock_done;
1908 Label slow_path_unlock;
1909 if (method->is_synchronized()) {
1910
1911 // Get locked oop from the handle we passed to jni
1912 __ ldr(obj_reg, Address(oop_handle_reg, 0));
1913
1914 Label done, not_recursive;
1915
1916 if (!UseHeavyMonitors) {
1917 // Simple recursive lock?
1918 __ ldr(rscratch1, Address(sp, lock_slot_offset * VMRegImpl::stack_slot_size));
1919 __ cbnz(rscratch1, not_recursive);
1920 __ decrement(Address(rthread, JavaThread::held_monitor_count_offset()));
1921 __ b(done);
1922 }
1923
1924 __ bind(not_recursive);
1925
1926 // Must save r0 if if it is live now because cmpxchg must use it
1927 if (ret_type != T_FLOAT && ret_type != T_DOUBLE && ret_type != T_VOID) {
1928 save_native_result(masm, ret_type, stack_slots);
1929 }
1930
1931 if (!UseHeavyMonitors) {
1932 // get address of the stack lock
1933 __ lea(r0, Address(sp, lock_slot_offset * VMRegImpl::stack_slot_size));
1934 // get old displaced header
1935 __ ldr(old_hdr, Address(r0, 0));
1936
1937 // Atomic swap old header if oop still contains the stack lock
1938 Label count;
1939 __ cmpxchg_obj_header(r0, old_hdr, obj_reg, rscratch1, count, &slow_path_unlock);
1940 __ bind(count);
1941 __ decrement(Address(rthread, JavaThread::held_monitor_count_offset()));
1942 } else {
1943 __ b(slow_path_unlock);
1944 }
1945
1946 // slow path re-enters here
1947 __ bind(unlock_done);
1948 if (ret_type != T_FLOAT && ret_type != T_DOUBLE && ret_type != T_VOID) {
1949 restore_native_result(masm, ret_type, stack_slots);
1950 }
1951
1952 __ bind(done);
1953 }
1954
1955 Label dtrace_method_exit, dtrace_method_exit_done;
1956 {
1957 uint64_t offset;
1958 __ adrp(rscratch1, ExternalAddress((address)&DTraceMethodProbes), offset);
1959 __ ldrb(rscratch1, Address(rscratch1, offset));
1960 __ cbnzw(rscratch1, dtrace_method_exit);
1961 __ bind(dtrace_method_exit_done);
1962 }
1963
1964 __ reset_last_Java_frame(false);
1965
1966 // Unbox oop result, e.g. JNIHandles::resolve result.
1967 if (is_reference_type(ret_type)) {
1968 __ resolve_jobject(r0, r1, r2);
1969 }
1970
1971 if (CheckJNICalls) {
1972 // clear_pending_jni_exception_check
1973 __ str(zr, Address(rthread, JavaThread::pending_jni_exception_check_fn_offset()));
1974 }
1975
1976 // reset handle block
1977 __ ldr(r2, Address(rthread, JavaThread::active_handles_offset()));
1978 __ str(zr, Address(r2, JNIHandleBlock::top_offset_in_bytes()));
1979
1980 __ leave();
1981
1982 // Any exception pending?
1983 __ ldr(rscratch1, Address(rthread, in_bytes(Thread::pending_exception_offset())));
1984 __ cbnz(rscratch1, exception_pending);
1985
1986 // We're done
1987 __ ret(lr);
1988
1989 // Unexpected paths are out of line and go here
1990
1991 // forward the exception
1992 __ bind(exception_pending);
1993
1994 // and forward the exception
1995 __ far_jump(RuntimeAddress(StubRoutines::forward_exception_entry()));
1996
1997 // Slow path locking & unlocking
1998 if (method->is_synchronized()) {
1999
2000 __ block_comment("Slow path lock {");
2001 __ bind(slow_path_lock);
2002
2003 // has last_Java_frame setup. No exceptions so do vanilla call not call_VM
2004 // args are (oop obj, BasicLock* lock, JavaThread* thread)
2005
2006 // protect the args we've loaded
2007 save_args(masm, total_c_args, c_arg, out_regs);
2008
2009 __ mov(c_rarg0, obj_reg);
2010 __ mov(c_rarg1, lock_reg);
2011 __ mov(c_rarg2, rthread);
2012
2013 // Not a leaf but we have last_Java_frame setup as we want
2014 __ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::complete_monitor_locking_C), 3);
2015 restore_args(masm, total_c_args, c_arg, out_regs);
2016
2017 #ifdef ASSERT
2018 { Label L;
2019 __ ldr(rscratch1, Address(rthread, in_bytes(Thread::pending_exception_offset())));
2020 __ cbz(rscratch1, L);
2021 __ stop("no pending exception allowed on exit from monitorenter");
2022 __ bind(L);
2023 }
2024 #endif
2025 __ b(lock_done);
2026
2027 __ block_comment("} Slow path lock");
2028
2029 __ block_comment("Slow path unlock {");
2030 __ bind(slow_path_unlock);
2031
2032 // If we haven't already saved the native result we must save it now as xmm registers
2033 // are still exposed.
2034
2035 if (ret_type == T_FLOAT || ret_type == T_DOUBLE ) {
2036 save_native_result(masm, ret_type, stack_slots);
2037 }
2038
2039 __ mov(c_rarg2, rthread);
2040 __ lea(c_rarg1, Address(sp, lock_slot_offset * VMRegImpl::stack_slot_size));
2041 __ mov(c_rarg0, obj_reg);
2042
2043 // Save pending exception around call to VM (which contains an EXCEPTION_MARK)
2044 // NOTE that obj_reg == r19 currently
2045 __ ldr(r19, Address(rthread, in_bytes(Thread::pending_exception_offset())));
2046 __ str(zr, Address(rthread, in_bytes(Thread::pending_exception_offset())));
2047
2048 __ rt_call(CAST_FROM_FN_PTR(address, SharedRuntime::complete_monitor_unlocking_C));
2049
2050 #ifdef ASSERT
2051 {
2052 Label L;
2053 __ ldr(rscratch1, Address(rthread, in_bytes(Thread::pending_exception_offset())));
2054 __ cbz(rscratch1, L);
2055 __ stop("no pending exception allowed on exit complete_monitor_unlocking_C");
2056 __ bind(L);
2057 }
2058 #endif /* ASSERT */
2059
2060 __ str(r19, Address(rthread, in_bytes(Thread::pending_exception_offset())));
2061
2062 if (ret_type == T_FLOAT || ret_type == T_DOUBLE ) {
2063 restore_native_result(masm, ret_type, stack_slots);
2064 }
2065 __ b(unlock_done);
2066
2067 __ block_comment("} Slow path unlock");
2068
2069 } // synchronized
2070
2071 // SLOW PATH Reguard the stack if needed
2072
2073 __ bind(reguard);
2074 save_native_result(masm, ret_type, stack_slots);
2075 __ rt_call(CAST_FROM_FN_PTR(address, SharedRuntime::reguard_yellow_pages));
2076 restore_native_result(masm, ret_type, stack_slots);
2077 // and continue
2078 __ b(reguard_done);
2079
2080 // SLOW PATH safepoint
2081 {
2082 __ block_comment("safepoint {");
2083 __ bind(safepoint_in_progress);
2084
2085 // Don't use call_VM as it will see a possible pending exception and forward it
2086 // and never return here preventing us from clearing _last_native_pc down below.
2087 //
2088 save_native_result(masm, ret_type, stack_slots);
2089 __ mov(c_rarg0, rthread);
2090 #ifndef PRODUCT
2091 assert(frame::arg_reg_save_area_bytes == 0, "not expecting frame reg save area");
2092 #endif
2093 __ lea(rscratch1, RuntimeAddress(CAST_FROM_FN_PTR(address, JavaThread::check_special_condition_for_native_trans)));
2094 __ blr(rscratch1);
2095
2096 // Restore any method result value
2097 restore_native_result(masm, ret_type, stack_slots);
2098
2099 __ b(safepoint_in_progress_done);
2100 __ block_comment("} safepoint");
2101 }
2102
2103 // SLOW PATH dtrace support
2104 {
2105 __ block_comment("dtrace entry {");
2106 __ bind(dtrace_method_entry);
2107
2108 // We have all of the arguments setup at this point. We must not touch any register
2109 // argument registers at this point (what if we save/restore them there are no oop?
2110
2111 save_args(masm, total_c_args, c_arg, out_regs);
2112 __ mov_metadata(c_rarg1, method());
2113 __ call_VM_leaf(
2114 CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_entry),
2115 rthread, c_rarg1);
2116 restore_args(masm, total_c_args, c_arg, out_regs);
2117 __ b(dtrace_method_entry_done);
2118 __ block_comment("} dtrace entry");
2119 }
2120
2121 {
2122 __ block_comment("dtrace exit {");
2123 __ bind(dtrace_method_exit);
2124 save_native_result(masm, ret_type, stack_slots);
2125 __ mov_metadata(c_rarg1, method());
2126 __ call_VM_leaf(
2127 CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_exit),
2128 rthread, c_rarg1);
2129 restore_native_result(masm, ret_type, stack_slots);
2130 __ b(dtrace_method_exit_done);
2131 __ block_comment("} dtrace exit");
2132 }
2133
2134
2135 __ flush();
2136
2137 nmethod *nm = nmethod::new_native_nmethod(method,
2138 compile_id,
2139 masm->code(),
2140 vep_offset,
2141 frame_complete,
2142 stack_slots / VMRegImpl::slots_per_word,
2143 (is_static ? in_ByteSize(klass_offset) : in_ByteSize(receiver_offset)),
2144 in_ByteSize(lock_slot_offset*VMRegImpl::stack_slot_size),
2145 oop_maps);
2146
2147 return nm;
2148 }
2149
2150 // this function returns the adjust size (in number of words) to a c2i adapter
2151 // activation for use during deoptimization
2152 int Deoptimization::last_frame_adjust(int callee_parameters, int callee_locals) {
2153 assert(callee_locals >= callee_parameters,
2154 "test and remove; got more parms than locals");
2155 if (callee_locals < callee_parameters)
2156 return 0; // No adjustment for negative locals
2157 int diff = (callee_locals - callee_parameters) * Interpreter::stackElementWords;
2158 // diff is counted in stack words
2159 return align_up(diff, 2);
2160 }
2161
2162
2163 //------------------------------generate_deopt_blob----------------------------
2164 void SharedRuntime::generate_deopt_blob() {
2165 // Allocate space for the code
2166 ResourceMark rm;
2167 // Setup code generation tools
2168 int pad = 0;
2169 #if INCLUDE_JVMCI
2170 if (EnableJVMCI) {
2171 pad += 512; // Increase the buffer size when compiling for JVMCI
2172 }
2173 #endif
2174 CodeBuffer buffer("deopt_blob", 2048+pad, 1024);
2175 MacroAssembler* masm = new MacroAssembler(&buffer);
2176 int frame_size_in_words;
2177 OopMap* map = NULL;
2178 OopMapSet *oop_maps = new OopMapSet();
2179 RegisterSaver reg_save(COMPILER2_OR_JVMCI != 0);
2180
2181 // -------------
2182 // This code enters when returning to a de-optimized nmethod. A return
2183 // address has been pushed on the stack, and return values are in
2184 // registers.
2185 // If we are doing a normal deopt then we were called from the patched
2186 // nmethod from the point we returned to the nmethod. So the return
2187 // address on the stack is wrong by NativeCall::instruction_size
2188 // We will adjust the value so it looks like we have the original return
2189 // address on the stack (like when we eagerly deoptimized).
2190 // In the case of an exception pending when deoptimizing, we enter
2191 // with a return address on the stack that points after the call we patched
2192 // into the exception handler. We have the following register state from,
2193 // e.g., the forward exception stub (see stubGenerator_x86_64.cpp).
2194 // r0: exception oop
2195 // r19: exception handler
2196 // r3: throwing pc
2197 // So in this case we simply jam r3 into the useless return address and
2198 // the stack looks just like we want.
2199 //
2200 // At this point we need to de-opt. We save the argument return
2201 // registers. We call the first C routine, fetch_unroll_info(). This
2202 // routine captures the return values and returns a structure which
2203 // describes the current frame size and the sizes of all replacement frames.
2204 // The current frame is compiled code and may contain many inlined
2205 // functions, each with their own JVM state. We pop the current frame, then
2206 // push all the new frames. Then we call the C routine unpack_frames() to
2207 // populate these frames. Finally unpack_frames() returns us the new target
2208 // address. Notice that callee-save registers are BLOWN here; they have
2209 // already been captured in the vframeArray at the time the return PC was
2210 // patched.
2211 address start = __ pc();
2212 Label cont;
2213
2214 // Prolog for non exception case!
2215
2216 // Save everything in sight.
2217 map = reg_save.save_live_registers(masm, 0, &frame_size_in_words);
2218
2219 // Normal deoptimization. Save exec mode for unpack_frames.
2220 __ movw(rcpool, Deoptimization::Unpack_deopt); // callee-saved
2221 __ b(cont);
2222
2223 int reexecute_offset = __ pc() - start;
2224 #if INCLUDE_JVMCI && !defined(COMPILER1)
2225 if (EnableJVMCI && UseJVMCICompiler) {
2226 // JVMCI does not use this kind of deoptimization
2227 __ should_not_reach_here();
2228 }
2229 #endif
2230
2231 // Reexecute case
2232 // return address is the pc describes what bci to do re-execute at
2233
2234 // No need to update map as each call to save_live_registers will produce identical oopmap
2235 (void) reg_save.save_live_registers(masm, 0, &frame_size_in_words);
2236
2237 __ movw(rcpool, Deoptimization::Unpack_reexecute); // callee-saved
2238 __ b(cont);
2239
2240 #if INCLUDE_JVMCI
2241 Label after_fetch_unroll_info_call;
2242 int implicit_exception_uncommon_trap_offset = 0;
2243 int uncommon_trap_offset = 0;
2244
2245 if (EnableJVMCI) {
2246 implicit_exception_uncommon_trap_offset = __ pc() - start;
2247
2248 __ ldr(lr, Address(rthread, in_bytes(JavaThread::jvmci_implicit_exception_pc_offset())));
2249 __ str(zr, Address(rthread, in_bytes(JavaThread::jvmci_implicit_exception_pc_offset())));
2250
2251 uncommon_trap_offset = __ pc() - start;
2252
2253 // Save everything in sight.
2254 reg_save.save_live_registers(masm, 0, &frame_size_in_words);
2255 // fetch_unroll_info needs to call last_java_frame()
2256 Label retaddr;
2257 __ set_last_Java_frame(sp, noreg, retaddr, rscratch1);
2258
2259 __ ldrw(c_rarg1, Address(rthread, in_bytes(JavaThread::pending_deoptimization_offset())));
2260 __ movw(rscratch1, -1);
2261 __ strw(rscratch1, Address(rthread, in_bytes(JavaThread::pending_deoptimization_offset())));
2262
2263 __ movw(rcpool, (int32_t)Deoptimization::Unpack_reexecute);
2264 __ mov(c_rarg0, rthread);
2265 __ movw(c_rarg2, rcpool); // exec mode
2266 __ lea(rscratch1,
2267 RuntimeAddress(CAST_FROM_FN_PTR(address,
2268 Deoptimization::uncommon_trap)));
2269 __ blr(rscratch1);
2270 __ bind(retaddr);
2271 oop_maps->add_gc_map( __ pc()-start, map->deep_copy());
2272
2273 __ reset_last_Java_frame(false);
2274
2275 __ b(after_fetch_unroll_info_call);
2276 } // EnableJVMCI
2277 #endif // INCLUDE_JVMCI
2278
2279 int exception_offset = __ pc() - start;
2280
2281 // Prolog for exception case
2282
2283 // all registers are dead at this entry point, except for r0, and
2284 // r3 which contain the exception oop and exception pc
2285 // respectively. Set them in TLS and fall thru to the
2286 // unpack_with_exception_in_tls entry point.
2287
2288 __ str(r3, Address(rthread, JavaThread::exception_pc_offset()));
2289 __ str(r0, Address(rthread, JavaThread::exception_oop_offset()));
2290
2291 int exception_in_tls_offset = __ pc() - start;
2292
2293 // new implementation because exception oop is now passed in JavaThread
2294
2295 // Prolog for exception case
2296 // All registers must be preserved because they might be used by LinearScan
2297 // Exceptiop oop and throwing PC are passed in JavaThread
2298 // tos: stack at point of call to method that threw the exception (i.e. only
2299 // args are on the stack, no return address)
2300
2301 // The return address pushed by save_live_registers will be patched
2302 // later with the throwing pc. The correct value is not available
2303 // now because loading it from memory would destroy registers.
2304
2305 // NB: The SP at this point must be the SP of the method that is
2306 // being deoptimized. Deoptimization assumes that the frame created
2307 // here by save_live_registers is immediately below the method's SP.
2308 // This is a somewhat fragile mechanism.
2309
2310 // Save everything in sight.
2311 map = reg_save.save_live_registers(masm, 0, &frame_size_in_words);
2312
2313 // Now it is safe to overwrite any register
2314
2315 // Deopt during an exception. Save exec mode for unpack_frames.
2316 __ mov(rcpool, Deoptimization::Unpack_exception); // callee-saved
2317
2318 // load throwing pc from JavaThread and patch it as the return address
2319 // of the current frame. Then clear the field in JavaThread
2320 __ ldr(r3, Address(rthread, JavaThread::exception_pc_offset()));
2321 __ protect_return_address(r3, rscratch1);
2322 __ str(r3, Address(rfp, wordSize));
2323 __ str(zr, Address(rthread, JavaThread::exception_pc_offset()));
2324
2325 #ifdef ASSERT
2326 // verify that there is really an exception oop in JavaThread
2327 __ ldr(r0, Address(rthread, JavaThread::exception_oop_offset()));
2328 __ verify_oop(r0);
2329
2330 // verify that there is no pending exception
2331 Label no_pending_exception;
2332 __ ldr(rscratch1, Address(rthread, Thread::pending_exception_offset()));
2333 __ cbz(rscratch1, no_pending_exception);
2334 __ stop("must not have pending exception here");
2335 __ bind(no_pending_exception);
2336 #endif
2337
2338 __ bind(cont);
2339
2340 // Call C code. Need thread and this frame, but NOT official VM entry
2341 // crud. We cannot block on this call, no GC can happen.
2342 //
2343 // UnrollBlock* fetch_unroll_info(JavaThread* thread)
2344
2345 // fetch_unroll_info needs to call last_java_frame().
2346
2347 Label retaddr;
2348 __ set_last_Java_frame(sp, noreg, retaddr, rscratch1);
2349 #ifdef ASSERT
2350 { Label L;
2351 __ ldr(rscratch1, Address(rthread, JavaThread::last_Java_fp_offset()));
2352 __ cbz(rscratch1, L);
2353 __ stop("SharedRuntime::generate_deopt_blob: last_Java_fp not cleared");
2354 __ bind(L);
2355 }
2356 #endif // ASSERT
2357 __ mov(c_rarg0, rthread);
2358 __ mov(c_rarg1, rcpool);
2359 __ lea(rscratch1, RuntimeAddress(CAST_FROM_FN_PTR(address, Deoptimization::fetch_unroll_info)));
2360 __ blr(rscratch1);
2361 __ bind(retaddr);
2362
2363 // Need to have an oopmap that tells fetch_unroll_info where to
2364 // find any register it might need.
2365 oop_maps->add_gc_map(__ pc() - start, map);
2366
2367 __ reset_last_Java_frame(false);
2368
2369 #if INCLUDE_JVMCI
2370 if (EnableJVMCI) {
2371 __ bind(after_fetch_unroll_info_call);
2372 }
2373 #endif
2374
2375 // Load UnrollBlock* into r5
2376 __ mov(r5, r0);
2377
2378 __ ldrw(rcpool, Address(r5, Deoptimization::UnrollBlock::unpack_kind_offset_in_bytes()));
2379 Label noException;
2380 __ cmpw(rcpool, Deoptimization::Unpack_exception); // Was exception pending?
2381 __ br(Assembler::NE, noException);
2382 __ ldr(r0, Address(rthread, JavaThread::exception_oop_offset()));
2383 // QQQ this is useless it was NULL above
2384 __ ldr(r3, Address(rthread, JavaThread::exception_pc_offset()));
2385 __ str(zr, Address(rthread, JavaThread::exception_oop_offset()));
2386 __ str(zr, Address(rthread, JavaThread::exception_pc_offset()));
2387
2388 __ verify_oop(r0);
2389
2390 // Overwrite the result registers with the exception results.
2391 __ str(r0, Address(sp, reg_save.r0_offset_in_bytes()));
2392 // I think this is useless
2393 // __ str(r3, Address(sp, RegisterSaver::r3_offset_in_bytes()));
2394
2395 __ bind(noException);
2396
2397 // Only register save data is on the stack.
2398 // Now restore the result registers. Everything else is either dead
2399 // or captured in the vframeArray.
2400
2401 // Restore fp result register
2402 __ ldrd(v0, Address(sp, reg_save.v0_offset_in_bytes()));
2403 // Restore integer result register
2404 __ ldr(r0, Address(sp, reg_save.r0_offset_in_bytes()));
2405
2406 // Pop all of the register save area off the stack
2407 __ add(sp, sp, frame_size_in_words * wordSize);
2408
2409 // All of the register save area has been popped of the stack. Only the
2410 // return address remains.
2411
2412 // Pop all the frames we must move/replace.
2413 //
2414 // Frame picture (youngest to oldest)
2415 // 1: self-frame (no frame link)
2416 // 2: deopting frame (no frame link)
2417 // 3: caller of deopting frame (could be compiled/interpreted).
2418 //
2419 // Note: by leaving the return address of self-frame on the stack
2420 // and using the size of frame 2 to adjust the stack
2421 // when we are done the return to frame 3 will still be on the stack.
2422
2423 // Pop deoptimized frame
2424 __ ldrw(r2, Address(r5, Deoptimization::UnrollBlock::size_of_deoptimized_frame_offset_in_bytes()));
2425 __ sub(r2, r2, 2 * wordSize);
2426 __ add(sp, sp, r2);
2427 __ ldp(rfp, lr, __ post(sp, 2 * wordSize));
2428 __ authenticate_return_address();
2429 // LR should now be the return address to the caller (3)
2430
2431 #ifdef ASSERT
2432 // Compilers generate code that bang the stack by as much as the
2433 // interpreter would need. So this stack banging should never
2434 // trigger a fault. Verify that it does not on non product builds.
2435 __ ldrw(r19, Address(r5, Deoptimization::UnrollBlock::total_frame_sizes_offset_in_bytes()));
2436 __ bang_stack_size(r19, r2);
2437 #endif
2438 // Load address of array of frame pcs into r2
2439 __ ldr(r2, Address(r5, Deoptimization::UnrollBlock::frame_pcs_offset_in_bytes()));
2440
2441 // Trash the old pc
2442 // __ addptr(sp, wordSize); FIXME ????
2443
2444 // Load address of array of frame sizes into r4
2445 __ ldr(r4, Address(r5, Deoptimization::UnrollBlock::frame_sizes_offset_in_bytes()));
2446
2447 // Load counter into r3
2448 __ ldrw(r3, Address(r5, Deoptimization::UnrollBlock::number_of_frames_offset_in_bytes()));
2449
2450 // Now adjust the caller's stack to make up for the extra locals
2451 // but record the original sp so that we can save it in the skeletal interpreter
2452 // frame and the stack walking of interpreter_sender will get the unextended sp
2453 // value and not the "real" sp value.
2454
2455 const Register sender_sp = r6;
2456
2457 __ mov(sender_sp, sp);
2458 __ ldrw(r19, Address(r5,
2459 Deoptimization::UnrollBlock::
2460 caller_adjustment_offset_in_bytes()));
2461 __ sub(sp, sp, r19);
2462
2463 // Push interpreter frames in a loop
2464 __ mov(rscratch1, (uint64_t)0xDEADDEAD); // Make a recognizable pattern
2465 __ mov(rscratch2, rscratch1);
2466 Label loop;
2467 __ bind(loop);
2468 __ ldr(r19, Address(__ post(r4, wordSize))); // Load frame size
2469 __ sub(r19, r19, 2*wordSize); // We'll push pc and fp by hand
2470 __ ldr(lr, Address(__ post(r2, wordSize))); // Load pc
2471 __ enter(); // Save old & set new fp
2472 __ sub(sp, sp, r19); // Prolog
2473 // This value is corrected by layout_activation_impl
2474 __ str(zr, Address(rfp, frame::interpreter_frame_last_sp_offset * wordSize));
2475 __ str(sender_sp, Address(rfp, frame::interpreter_frame_sender_sp_offset * wordSize)); // Make it walkable
2476 __ mov(sender_sp, sp); // Pass sender_sp to next frame
2477 __ sub(r3, r3, 1); // Decrement counter
2478 __ cbnz(r3, loop);
2479
2480 // Re-push self-frame
2481 __ ldr(lr, Address(r2));
2482 __ enter();
2483
2484 // Allocate a full sized register save area. We subtract 2 because
2485 // enter() just pushed 2 words
2486 __ sub(sp, sp, (frame_size_in_words - 2) * wordSize);
2487
2488 // Restore frame locals after moving the frame
2489 __ strd(v0, Address(sp, reg_save.v0_offset_in_bytes()));
2490 __ str(r0, Address(sp, reg_save.r0_offset_in_bytes()));
2491
2492 // Call C code. Need thread but NOT official VM entry
2493 // crud. We cannot block on this call, no GC can happen. Call should
2494 // restore return values to their stack-slots with the new SP.
2495 //
2496 // void Deoptimization::unpack_frames(JavaThread* thread, int exec_mode)
2497
2498 // Use rfp because the frames look interpreted now
2499 // Don't need the precise return PC here, just precise enough to point into this code blob.
2500 address the_pc = __ pc();
2501 __ set_last_Java_frame(sp, rfp, the_pc, rscratch1);
2502
2503 __ mov(c_rarg0, rthread);
2504 __ movw(c_rarg1, rcpool); // second arg: exec_mode
2505 __ lea(rscratch1, RuntimeAddress(CAST_FROM_FN_PTR(address, Deoptimization::unpack_frames)));
2506 __ blr(rscratch1);
2507
2508 // Set an oopmap for the call site
2509 // Use the same PC we used for the last java frame
2510 oop_maps->add_gc_map(the_pc - start,
2511 new OopMap( frame_size_in_words, 0 ));
2512
2513 // Clear fp AND pc
2514 __ reset_last_Java_frame(true);
2515
2516 // Collect return values
2517 __ ldrd(v0, Address(sp, reg_save.v0_offset_in_bytes()));
2518 __ ldr(r0, Address(sp, reg_save.r0_offset_in_bytes()));
2519 // I think this is useless (throwing pc?)
2520 // __ ldr(r3, Address(sp, RegisterSaver::r3_offset_in_bytes()));
2521
2522 // Pop self-frame.
2523 __ leave(); // Epilog
2524
2525 // Jump to interpreter
2526 __ ret(lr);
2527
2528 // Make sure all code is generated
2529 masm->flush();
2530
2531 _deopt_blob = DeoptimizationBlob::create(&buffer, oop_maps, 0, exception_offset, reexecute_offset, frame_size_in_words);
2532 _deopt_blob->set_unpack_with_exception_in_tls_offset(exception_in_tls_offset);
2533 #if INCLUDE_JVMCI
2534 if (EnableJVMCI) {
2535 _deopt_blob->set_uncommon_trap_offset(uncommon_trap_offset);
2536 _deopt_blob->set_implicit_exception_uncommon_trap_offset(implicit_exception_uncommon_trap_offset);
2537 }
2538 #endif
2539 }
2540
2541 // Number of stack slots between incoming argument block and the start of
2542 // a new frame. The PROLOG must add this many slots to the stack. The
2543 // EPILOG must remove this many slots. aarch64 needs two slots for
2544 // return address and fp.
2545 // TODO think this is correct but check
2546 uint SharedRuntime::in_preserve_stack_slots() {
2547 return 4;
2548 }
2549
2550 uint SharedRuntime::out_preserve_stack_slots() {
2551 return 0;
2552 }
2553
2554 #ifdef COMPILER2
2555 //------------------------------generate_uncommon_trap_blob--------------------
2556 void SharedRuntime::generate_uncommon_trap_blob() {
2557 // Allocate space for the code
2558 ResourceMark rm;
2559 // Setup code generation tools
2560 CodeBuffer buffer("uncommon_trap_blob", 2048, 1024);
2561 MacroAssembler* masm = new MacroAssembler(&buffer);
2562
2563 assert(SimpleRuntimeFrame::framesize % 4 == 0, "sp not 16-byte aligned");
2564
2565 address start = __ pc();
2566
2567 // Push self-frame. We get here with a return address in LR
2568 // and sp should be 16 byte aligned
2569 // push rfp and retaddr by hand
2570 __ protect_return_address();
2571 __ stp(rfp, lr, Address(__ pre(sp, -2 * wordSize)));
2572 // we don't expect an arg reg save area
2573 #ifndef PRODUCT
2574 assert(frame::arg_reg_save_area_bytes == 0, "not expecting frame reg save area");
2575 #endif
2576 // compiler left unloaded_class_index in j_rarg0 move to where the
2577 // runtime expects it.
2578 if (c_rarg1 != j_rarg0) {
2579 __ movw(c_rarg1, j_rarg0);
2580 }
2581
2582 // we need to set the past SP to the stack pointer of the stub frame
2583 // and the pc to the address where this runtime call will return
2584 // although actually any pc in this code blob will do).
2585 Label retaddr;
2586 __ set_last_Java_frame(sp, noreg, retaddr, rscratch1);
2587
2588 // Call C code. Need thread but NOT official VM entry
2589 // crud. We cannot block on this call, no GC can happen. Call should
2590 // capture callee-saved registers as well as return values.
2591 // Thread is in rdi already.
2592 //
2593 // UnrollBlock* uncommon_trap(JavaThread* thread, jint unloaded_class_index);
2594 //
2595 // n.b. 2 gp args, 0 fp args, integral return type
2596
2597 __ mov(c_rarg0, rthread);
2598 __ movw(c_rarg2, (unsigned)Deoptimization::Unpack_uncommon_trap);
2599 __ lea(rscratch1,
2600 RuntimeAddress(CAST_FROM_FN_PTR(address,
2601 Deoptimization::uncommon_trap)));
2602 __ blr(rscratch1);
2603 __ bind(retaddr);
2604
2605 // Set an oopmap for the call site
2606 OopMapSet* oop_maps = new OopMapSet();
2607 OopMap* map = new OopMap(SimpleRuntimeFrame::framesize, 0);
2608
2609 // location of rfp is known implicitly by the frame sender code
2610
2611 oop_maps->add_gc_map(__ pc() - start, map);
2612
2613 __ reset_last_Java_frame(false);
2614
2615 // move UnrollBlock* into r4
2616 __ mov(r4, r0);
2617
2618 #ifdef ASSERT
2619 { Label L;
2620 __ ldrw(rscratch1, Address(r4, Deoptimization::UnrollBlock::unpack_kind_offset_in_bytes()));
2621 __ cmpw(rscratch1, (unsigned)Deoptimization::Unpack_uncommon_trap);
2622 __ br(Assembler::EQ, L);
2623 __ stop("SharedRuntime::generate_uncommon_trap_blob: expected Unpack_uncommon_trap");
2624 __ bind(L);
2625 }
2626 #endif
2627
2628 // Pop all the frames we must move/replace.
2629 //
2630 // Frame picture (youngest to oldest)
2631 // 1: self-frame (no frame link)
2632 // 2: deopting frame (no frame link)
2633 // 3: caller of deopting frame (could be compiled/interpreted).
2634
2635 // Pop self-frame. We have no frame, and must rely only on r0 and sp.
2636 __ add(sp, sp, (SimpleRuntimeFrame::framesize) << LogBytesPerInt); // Epilog!
2637
2638 // Pop deoptimized frame (int)
2639 __ ldrw(r2, Address(r4,
2640 Deoptimization::UnrollBlock::
2641 size_of_deoptimized_frame_offset_in_bytes()));
2642 __ sub(r2, r2, 2 * wordSize);
2643 __ add(sp, sp, r2);
2644 __ ldp(rfp, lr, __ post(sp, 2 * wordSize));
2645 __ authenticate_return_address();
2646 // LR should now be the return address to the caller (3) frame
2647
2648 #ifdef ASSERT
2649 // Compilers generate code that bang the stack by as much as the
2650 // interpreter would need. So this stack banging should never
2651 // trigger a fault. Verify that it does not on non product builds.
2652 __ ldrw(r1, Address(r4,
2653 Deoptimization::UnrollBlock::
2654 total_frame_sizes_offset_in_bytes()));
2655 __ bang_stack_size(r1, r2);
2656 #endif
2657
2658 // Load address of array of frame pcs into r2 (address*)
2659 __ ldr(r2, Address(r4,
2660 Deoptimization::UnrollBlock::frame_pcs_offset_in_bytes()));
2661
2662 // Load address of array of frame sizes into r5 (intptr_t*)
2663 __ ldr(r5, Address(r4,
2664 Deoptimization::UnrollBlock::
2665 frame_sizes_offset_in_bytes()));
2666
2667 // Counter
2668 __ ldrw(r3, Address(r4,
2669 Deoptimization::UnrollBlock::
2670 number_of_frames_offset_in_bytes())); // (int)
2671
2672 // Now adjust the caller's stack to make up for the extra locals but
2673 // record the original sp so that we can save it in the skeletal
2674 // interpreter frame and the stack walking of interpreter_sender
2675 // will get the unextended sp value and not the "real" sp value.
2676
2677 const Register sender_sp = r8;
2678
2679 __ mov(sender_sp, sp);
2680 __ ldrw(r1, Address(r4,
2681 Deoptimization::UnrollBlock::
2682 caller_adjustment_offset_in_bytes())); // (int)
2683 __ sub(sp, sp, r1);
2684
2685 // Push interpreter frames in a loop
2686 Label loop;
2687 __ bind(loop);
2688 __ ldr(r1, Address(r5, 0)); // Load frame size
2689 __ sub(r1, r1, 2 * wordSize); // We'll push pc and rfp by hand
2690 __ ldr(lr, Address(r2, 0)); // Save return address
2691 __ enter(); // and old rfp & set new rfp
2692 __ sub(sp, sp, r1); // Prolog
2693 __ str(sender_sp, Address(rfp, frame::interpreter_frame_sender_sp_offset * wordSize)); // Make it walkable
2694 // This value is corrected by layout_activation_impl
2695 __ str(zr, Address(rfp, frame::interpreter_frame_last_sp_offset * wordSize));
2696 __ mov(sender_sp, sp); // Pass sender_sp to next frame
2697 __ add(r5, r5, wordSize); // Bump array pointer (sizes)
2698 __ add(r2, r2, wordSize); // Bump array pointer (pcs)
2699 __ subsw(r3, r3, 1); // Decrement counter
2700 __ br(Assembler::GT, loop);
2701 __ ldr(lr, Address(r2, 0)); // save final return address
2702 // Re-push self-frame
2703 __ enter(); // & old rfp & set new rfp
2704
2705 // Use rfp because the frames look interpreted now
2706 // Save "the_pc" since it cannot easily be retrieved using the last_java_SP after we aligned SP.
2707 // Don't need the precise return PC here, just precise enough to point into this code blob.
2708 address the_pc = __ pc();
2709 __ set_last_Java_frame(sp, rfp, the_pc, rscratch1);
2710
2711 // Call C code. Need thread but NOT official VM entry
2712 // crud. We cannot block on this call, no GC can happen. Call should
2713 // restore return values to their stack-slots with the new SP.
2714 // Thread is in rdi already.
2715 //
2716 // BasicType unpack_frames(JavaThread* thread, int exec_mode);
2717 //
2718 // n.b. 2 gp args, 0 fp args, integral return type
2719
2720 // sp should already be aligned
2721 __ mov(c_rarg0, rthread);
2722 __ movw(c_rarg1, (unsigned)Deoptimization::Unpack_uncommon_trap);
2723 __ lea(rscratch1, RuntimeAddress(CAST_FROM_FN_PTR(address, Deoptimization::unpack_frames)));
2724 __ blr(rscratch1);
2725
2726 // Set an oopmap for the call site
2727 // Use the same PC we used for the last java frame
2728 oop_maps->add_gc_map(the_pc - start, new OopMap(SimpleRuntimeFrame::framesize, 0));
2729
2730 // Clear fp AND pc
2731 __ reset_last_Java_frame(true);
2732
2733 // Pop self-frame.
2734 __ leave(); // Epilog
2735
2736 // Jump to interpreter
2737 __ ret(lr);
2738
2739 // Make sure all code is generated
2740 masm->flush();
2741
2742 _uncommon_trap_blob = UncommonTrapBlob::create(&buffer, oop_maps,
2743 SimpleRuntimeFrame::framesize >> 1);
2744 }
2745 #endif // COMPILER2
2746
2747
2748 //------------------------------generate_handler_blob------
2749 //
2750 // Generate a special Compile2Runtime blob that saves all registers,
2751 // and setup oopmap.
2752 //
2753 SafepointBlob* SharedRuntime::generate_handler_blob(address call_ptr, int poll_type) {
2754 ResourceMark rm;
2755 OopMapSet *oop_maps = new OopMapSet();
2756 OopMap* map;
2757
2758 // Allocate space for the code. Setup code generation tools.
2759 CodeBuffer buffer("handler_blob", 2048, 1024);
2760 MacroAssembler* masm = new MacroAssembler(&buffer);
2761
2762 address start = __ pc();
2763 address call_pc = NULL;
2764 int frame_size_in_words;
2765 bool cause_return = (poll_type == POLL_AT_RETURN);
2766 RegisterSaver reg_save(poll_type == POLL_AT_VECTOR_LOOP /* save_vectors */);
2767
2768 // When the signal occurred, the LR was either signed and stored on the stack (in which
2769 // case it will be restored from the stack before being used) or unsigned and not stored
2770 // on the stack. Stipping ensures we get the right value.
2771 __ strip_return_address();
2772
2773 // Save Integer and Float registers.
2774 map = reg_save.save_live_registers(masm, 0, &frame_size_in_words);
2775
2776 // The following is basically a call_VM. However, we need the precise
2777 // address of the call in order to generate an oopmap. Hence, we do all the
2778 // work ourselves.
2779
2780 Label retaddr;
2781 __ set_last_Java_frame(sp, noreg, retaddr, rscratch1);
2782
2783 // The return address must always be correct so that frame constructor never
2784 // sees an invalid pc.
2785
2786 if (!cause_return) {
2787 // overwrite the return address pushed by save_live_registers
2788 // Additionally, r20 is a callee-saved register so we can look at
2789 // it later to determine if someone changed the return address for
2790 // us!
2791 __ ldr(r20, Address(rthread, JavaThread::saved_exception_pc_offset()));
2792 __ protect_return_address(r20, rscratch1);
2793 __ str(r20, Address(rfp, wordSize));
2794 }
2795
2796 // Do the call
2797 __ mov(c_rarg0, rthread);
2798 __ lea(rscratch1, RuntimeAddress(call_ptr));
2799 __ blr(rscratch1);
2800 __ bind(retaddr);
2801
2802 // Set an oopmap for the call site. This oopmap will map all
2803 // oop-registers and debug-info registers as callee-saved. This
2804 // will allow deoptimization at this safepoint to find all possible
2805 // debug-info recordings, as well as let GC find all oops.
2806
2807 oop_maps->add_gc_map( __ pc() - start, map);
2808
2809 Label noException;
2810
2811 __ reset_last_Java_frame(false);
2812
2813 __ membar(Assembler::LoadLoad | Assembler::LoadStore);
2814
2815 __ ldr(rscratch1, Address(rthread, Thread::pending_exception_offset()));
2816 __ cbz(rscratch1, noException);
2817
2818 // Exception pending
2819
2820 reg_save.restore_live_registers(masm);
2821
2822 __ far_jump(RuntimeAddress(StubRoutines::forward_exception_entry()));
2823
2824 // No exception case
2825 __ bind(noException);
2826
2827 Label no_adjust, bail;
2828 if (!cause_return) {
2829 // If our stashed return pc was modified by the runtime we avoid touching it
2830 __ ldr(rscratch1, Address(rfp, wordSize));
2831 __ cmp(r20, rscratch1);
2832 __ br(Assembler::NE, no_adjust);
2833 __ authenticate_return_address(r20, rscratch1);
2834
2835 #ifdef ASSERT
2836 // Verify the correct encoding of the poll we're about to skip.
2837 // See NativeInstruction::is_ldrw_to_zr()
2838 __ ldrw(rscratch1, Address(r20));
2839 __ ubfx(rscratch2, rscratch1, 22, 10);
2840 __ cmpw(rscratch2, 0b1011100101);
2841 __ br(Assembler::NE, bail);
2842 __ ubfx(rscratch2, rscratch1, 0, 5);
2843 __ cmpw(rscratch2, 0b11111);
2844 __ br(Assembler::NE, bail);
2845 #endif
2846 // Adjust return pc forward to step over the safepoint poll instruction
2847 __ add(r20, r20, NativeInstruction::instruction_size);
2848 __ protect_return_address(r20, rscratch1);
2849 __ str(r20, Address(rfp, wordSize));
2850 }
2851
2852 __ bind(no_adjust);
2853 // Normal exit, restore registers and exit.
2854 reg_save.restore_live_registers(masm);
2855
2856 __ ret(lr);
2857
2858 #ifdef ASSERT
2859 __ bind(bail);
2860 __ stop("Attempting to adjust pc to skip safepoint poll but the return point is not what we expected");
2861 #endif
2862
2863 // Make sure all code is generated
2864 masm->flush();
2865
2866 // Fill-out other meta info
2867 return SafepointBlob::create(&buffer, oop_maps, frame_size_in_words);
2868 }
2869
2870 //
2871 // generate_resolve_blob - call resolution (static/virtual/opt-virtual/ic-miss
2872 //
2873 // Generate a stub that calls into vm to find out the proper destination
2874 // of a java call. All the argument registers are live at this point
2875 // but since this is generic code we don't know what they are and the caller
2876 // must do any gc of the args.
2877 //
2878 RuntimeStub* SharedRuntime::generate_resolve_blob(address destination, const char* name) {
2879 assert (StubRoutines::forward_exception_entry() != NULL, "must be generated before");
2880
2881 // allocate space for the code
2882 ResourceMark rm;
2883
2884 CodeBuffer buffer(name, 1000, 512);
2885 MacroAssembler* masm = new MacroAssembler(&buffer);
2886
2887 int frame_size_in_words;
2888 RegisterSaver reg_save(false /* save_vectors */);
2889
2890 OopMapSet *oop_maps = new OopMapSet();
2891 OopMap* map = NULL;
2892
2893 int start = __ offset();
2894
2895 map = reg_save.save_live_registers(masm, 0, &frame_size_in_words);
2896
2897 int frame_complete = __ offset();
2898
2899 {
2900 Label retaddr;
2901 __ set_last_Java_frame(sp, noreg, retaddr, rscratch1);
2902
2903 __ mov(c_rarg0, rthread);
2904 __ lea(rscratch1, RuntimeAddress(destination));
2905
2906 __ blr(rscratch1);
2907 __ bind(retaddr);
2908 }
2909
2910 // Set an oopmap for the call site.
2911 // We need this not only for callee-saved registers, but also for volatile
2912 // registers that the compiler might be keeping live across a safepoint.
2913
2914 oop_maps->add_gc_map( __ offset() - start, map);
2915
2916 // r0 contains the address we are going to jump to assuming no exception got installed
2917
2918 // clear last_Java_sp
2919 __ reset_last_Java_frame(false);
2920 // check for pending exceptions
2921 Label pending;
2922 __ ldr(rscratch1, Address(rthread, Thread::pending_exception_offset()));
2923 __ cbnz(rscratch1, pending);
2924
2925 // get the returned Method*
2926 __ get_vm_result_2(rmethod, rthread);
2927 __ str(rmethod, Address(sp, reg_save.reg_offset_in_bytes(rmethod)));
2928
2929 // r0 is where we want to jump, overwrite rscratch1 which is saved and scratch
2930 __ str(r0, Address(sp, reg_save.rscratch1_offset_in_bytes()));
2931 reg_save.restore_live_registers(masm);
2932
2933 // We are back to the original state on entry and ready to go.
2934
2935 __ br(rscratch1);
2936
2937 // Pending exception after the safepoint
2938
2939 __ bind(pending);
2940
2941 reg_save.restore_live_registers(masm);
2942
2943 // exception pending => remove activation and forward to exception handler
2944
2945 __ str(zr, Address(rthread, JavaThread::vm_result_offset()));
2946
2947 __ ldr(r0, Address(rthread, Thread::pending_exception_offset()));
2948 __ far_jump(RuntimeAddress(StubRoutines::forward_exception_entry()));
2949
2950 // -------------
2951 // make sure all code is generated
2952 masm->flush();
2953
2954 // return the blob
2955 // frame_size_words or bytes??
2956 return RuntimeStub::new_runtime_stub(name, &buffer, frame_complete, frame_size_in_words, oop_maps, true);
2957 }
2958
2959 #ifdef COMPILER2
2960 // This is here instead of runtime_aarch64_64.cpp because it uses SimpleRuntimeFrame
2961 //
2962 //------------------------------generate_exception_blob---------------------------
2963 // creates exception blob at the end
2964 // Using exception blob, this code is jumped from a compiled method.
2965 // (see emit_exception_handler in x86_64.ad file)
2966 //
2967 // Given an exception pc at a call we call into the runtime for the
2968 // handler in this method. This handler might merely restore state
2969 // (i.e. callee save registers) unwind the frame and jump to the
2970 // exception handler for the nmethod if there is no Java level handler
2971 // for the nmethod.
2972 //
2973 // This code is entered with a jmp.
2974 //
2975 // Arguments:
2976 // r0: exception oop
2977 // r3: exception pc
2978 //
2979 // Results:
2980 // r0: exception oop
2981 // r3: exception pc in caller or ???
2982 // destination: exception handler of caller
2983 //
2984 // Note: the exception pc MUST be at a call (precise debug information)
2985 // Registers r0, r3, r2, r4, r5, r8-r11 are not callee saved.
2986 //
2987
2988 void OptoRuntime::generate_exception_blob() {
2989 assert(!OptoRuntime::is_callee_saved_register(R3_num), "");
2990 assert(!OptoRuntime::is_callee_saved_register(R0_num), "");
2991 assert(!OptoRuntime::is_callee_saved_register(R2_num), "");
2992
2993 assert(SimpleRuntimeFrame::framesize % 4 == 0, "sp not 16-byte aligned");
2994
2995 // Allocate space for the code
2996 ResourceMark rm;
2997 // Setup code generation tools
2998 CodeBuffer buffer("exception_blob", 2048, 1024);
2999 MacroAssembler* masm = new MacroAssembler(&buffer);
3000
3001 // TODO check various assumptions made here
3002 //
3003 // make sure we do so before running this
3004
3005 address start = __ pc();
3006
3007 // push rfp and retaddr by hand
3008 // Exception pc is 'return address' for stack walker
3009 __ protect_return_address();
3010 __ stp(rfp, lr, Address(__ pre(sp, -2 * wordSize)));
3011 // there are no callee save registers and we don't expect an
3012 // arg reg save area
3013 #ifndef PRODUCT
3014 assert(frame::arg_reg_save_area_bytes == 0, "not expecting frame reg save area");
3015 #endif
3016 // Store exception in Thread object. We cannot pass any arguments to the
3017 // handle_exception call, since we do not want to make any assumption
3018 // about the size of the frame where the exception happened in.
3019 __ str(r0, Address(rthread, JavaThread::exception_oop_offset()));
3020 __ str(r3, Address(rthread, JavaThread::exception_pc_offset()));
3021
3022 // This call does all the hard work. It checks if an exception handler
3023 // exists in the method.
3024 // If so, it returns the handler address.
3025 // If not, it prepares for stack-unwinding, restoring the callee-save
3026 // registers of the frame being removed.
3027 //
3028 // address OptoRuntime::handle_exception_C(JavaThread* thread)
3029 //
3030 // n.b. 1 gp arg, 0 fp args, integral return type
3031
3032 // the stack should always be aligned
3033 address the_pc = __ pc();
3034 __ set_last_Java_frame(sp, noreg, the_pc, rscratch1);
3035 __ mov(c_rarg0, rthread);
3036 __ lea(rscratch1, RuntimeAddress(CAST_FROM_FN_PTR(address, OptoRuntime::handle_exception_C)));
3037 __ blr(rscratch1);
3038 // handle_exception_C is a special VM call which does not require an explicit
3039 // instruction sync afterwards.
3040
3041 // May jump to SVE compiled code
3042 __ reinitialize_ptrue();
3043
3044 // Set an oopmap for the call site. This oopmap will only be used if we
3045 // are unwinding the stack. Hence, all locations will be dead.
3046 // Callee-saved registers will be the same as the frame above (i.e.,
3047 // handle_exception_stub), since they were restored when we got the
3048 // exception.
3049
3050 OopMapSet* oop_maps = new OopMapSet();
3051
3052 oop_maps->add_gc_map(the_pc - start, new OopMap(SimpleRuntimeFrame::framesize, 0));
3053
3054 __ reset_last_Java_frame(false);
3055
3056 // Restore callee-saved registers
3057
3058 // rfp is an implicitly saved callee saved register (i.e. the calling
3059 // convention will save restore it in prolog/epilog) Other than that
3060 // there are no callee save registers now that adapter frames are gone.
3061 // and we dont' expect an arg reg save area
3062 __ ldp(rfp, r3, Address(__ post(sp, 2 * wordSize)));
3063 __ authenticate_return_address(r3);
3064
3065 // r0: exception handler
3066
3067 // We have a handler in r0 (could be deopt blob).
3068 __ mov(r8, r0);
3069
3070 // Get the exception oop
3071 __ ldr(r0, Address(rthread, JavaThread::exception_oop_offset()));
3072 // Get the exception pc in case we are deoptimized
3073 __ ldr(r4, Address(rthread, JavaThread::exception_pc_offset()));
3074 #ifdef ASSERT
3075 __ str(zr, Address(rthread, JavaThread::exception_handler_pc_offset()));
3076 __ str(zr, Address(rthread, JavaThread::exception_pc_offset()));
3077 #endif
3078 // Clear the exception oop so GC no longer processes it as a root.
3079 __ str(zr, Address(rthread, JavaThread::exception_oop_offset()));
3080
3081 // r0: exception oop
3082 // r8: exception handler
3083 // r4: exception pc
3084 // Jump to handler
3085
3086 __ br(r8);
3087
3088 // Make sure all code is generated
3089 masm->flush();
3090
3091 // Set exception blob
3092 _exception_blob = ExceptionBlob::create(&buffer, oop_maps, SimpleRuntimeFrame::framesize >> 1);
3093 }
3094
3095 #endif // COMPILER2