1 /*
2 * Copyright (c) 2003, 2024, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2014, 2020, Red Hat Inc. All rights reserved.
4 * Copyright (c) 2020, 2023, Huawei Technologies Co., Ltd. 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/compiledIC.hpp"
31 #include "code/debugInfoRec.hpp"
32 #include "code/vtableStubs.hpp"
33 #include "compiler/oopMap.hpp"
34 #include "gc/shared/barrierSetAssembler.hpp"
35 #include "interpreter/interp_masm.hpp"
36 #include "interpreter/interpreter.hpp"
37 #include "logging/log.hpp"
38 #include "memory/resourceArea.hpp"
39 #include "nativeInst_riscv.hpp"
40 #include "oops/klass.inline.hpp"
41 #include "oops/method.inline.hpp"
42 #include "prims/methodHandles.hpp"
43 #include "runtime/continuation.hpp"
44 #include "runtime/continuationEntry.inline.hpp"
45 #include "runtime/globals.hpp"
46 #include "runtime/jniHandles.hpp"
47 #include "runtime/safepointMechanism.hpp"
48 #include "runtime/sharedRuntime.hpp"
49 #include "runtime/signature.hpp"
50 #include "runtime/stubRoutines.hpp"
51 #include "runtime/vframeArray.hpp"
52 #include "utilities/align.hpp"
53 #include "utilities/formatBuffer.hpp"
54 #include "vmreg_riscv.inline.hpp"
55 #ifdef COMPILER1
56 #include "c1/c1_Runtime1.hpp"
57 #endif
58 #ifdef COMPILER2
59 #include "adfiles/ad_riscv.hpp"
60 #include "opto/runtime.hpp"
61 #endif
62 #if INCLUDE_JVMCI
63 #include "jvmci/jvmciJavaClasses.hpp"
64 #endif
65
66 #define __ masm->
67
68 const int StackAlignmentInSlots = StackAlignmentInBytes / VMRegImpl::stack_slot_size;
69
70 class SimpleRuntimeFrame {
71 public:
72
73 // Most of the runtime stubs have this simple frame layout.
74 // This class exists to make the layout shared in one place.
75 // Offsets are for compiler stack slots, which are jints.
76 enum layout {
77 // The frame sender code expects that fp will be in the "natural" place and
78 // will override any oopMap setting for it. We must therefore force the layout
79 // so that it agrees with the frame sender code.
80 // we don't expect any arg reg save area so riscv asserts that
81 // frame::arg_reg_save_area_bytes == 0
82 fp_off = 0, fp_off2,
83 return_off, return_off2,
84 framesize
85 };
86 };
87
88 class RegisterSaver {
89 const bool _save_vectors;
90 public:
91 RegisterSaver(bool save_vectors) : _save_vectors(UseRVV && save_vectors) {}
92 ~RegisterSaver() {}
93 OopMap* save_live_registers(MacroAssembler* masm, int additional_frame_words, int* total_frame_words);
94 void restore_live_registers(MacroAssembler* masm);
95
96 // Offsets into the register save area
97 // Used by deoptimization when it is managing result register
98 // values on its own
99 // gregs:28, float_register:32; except: x1(ra) & x2(sp) & gp(x3) & tp(x4)
100 // |---v0---|<---SP
101 // |---v1---|save vectors only in generate_handler_blob
102 // |-- .. --|
103 // |---v31--|-----
104 // |---f0---|
105 // |---f1---|
106 // | .. |
107 // |---f31--|
108 // |---reserved slot for stack alignment---|
109 // |---x5---|
110 // | x6 |
111 // |---.. --|
112 // |---x31--|
113 // |---fp---|
114 // |---ra---|
115 int v0_offset_in_bytes(void) { return 0; }
116 int f0_offset_in_bytes(void) {
117 int f0_offset = 0;
118 #ifdef COMPILER2
119 if (_save_vectors) {
120 f0_offset += Matcher::scalable_vector_reg_size(T_INT) * VectorRegister::number_of_registers *
121 BytesPerInt;
122 }
123 #endif
124 return f0_offset;
125 }
126 int reserved_slot_offset_in_bytes(void) {
127 return f0_offset_in_bytes() +
128 FloatRegister::max_slots_per_register *
129 FloatRegister::number_of_registers *
130 BytesPerInt;
131 }
132
133 int reg_offset_in_bytes(Register r) {
134 assert (r->encoding() > 4, "ra, sp, gp and tp not saved");
135 return reserved_slot_offset_in_bytes() + (r->encoding() - 4 /* x1, x2, x3, x4 */) * wordSize;
136 }
137
138 int freg_offset_in_bytes(FloatRegister f) {
139 return f0_offset_in_bytes() + f->encoding() * wordSize;
140 }
141
142 int ra_offset_in_bytes(void) {
143 return reserved_slot_offset_in_bytes() +
144 (Register::number_of_registers - 3) *
145 Register::max_slots_per_register *
146 BytesPerInt;
147 }
148 };
149
150 OopMap* RegisterSaver::save_live_registers(MacroAssembler* masm, int additional_frame_words, int* total_frame_words) {
151 int vector_size_in_bytes = 0;
152 int vector_size_in_slots = 0;
153 #ifdef COMPILER2
154 if (_save_vectors) {
155 vector_size_in_bytes += Matcher::scalable_vector_reg_size(T_BYTE);
156 vector_size_in_slots += Matcher::scalable_vector_reg_size(T_INT);
157 }
158 #endif
159
160 int frame_size_in_bytes = align_up(additional_frame_words * wordSize + ra_offset_in_bytes() + wordSize, 16);
161 // OopMap frame size is in compiler stack slots (jint's) not bytes or words
162 int frame_size_in_slots = frame_size_in_bytes / BytesPerInt;
163 // The caller will allocate additional_frame_words
164 int additional_frame_slots = additional_frame_words * wordSize / BytesPerInt;
165 // CodeBlob frame size is in words.
166 int frame_size_in_words = frame_size_in_bytes / wordSize;
167 *total_frame_words = frame_size_in_words;
168
169 // Save Integer, Float and Vector registers.
170 __ enter();
171 __ push_CPU_state(_save_vectors, vector_size_in_bytes);
172
173 // Set an oopmap for the call site. This oopmap will map all
174 // oop-registers and debug-info registers as callee-saved. This
175 // will allow deoptimization at this safepoint to find all possible
176 // debug-info recordings, as well as let GC find all oops.
177
178 OopMapSet *oop_maps = new OopMapSet();
179 OopMap* oop_map = new OopMap(frame_size_in_slots, 0);
180 assert_cond(oop_maps != nullptr && oop_map != nullptr);
181
182 int sp_offset_in_slots = 0;
183 int step_in_slots = 0;
184 if (_save_vectors) {
185 step_in_slots = vector_size_in_slots;
186 for (int i = 0; i < VectorRegister::number_of_registers; i++, sp_offset_in_slots += step_in_slots) {
187 VectorRegister r = as_VectorRegister(i);
188 oop_map->set_callee_saved(VMRegImpl::stack2reg(sp_offset_in_slots), r->as_VMReg());
189 }
190 }
191
192 step_in_slots = FloatRegister::max_slots_per_register;
193 for (int i = 0; i < FloatRegister::number_of_registers; i++, sp_offset_in_slots += step_in_slots) {
194 FloatRegister r = as_FloatRegister(i);
195 oop_map->set_callee_saved(VMRegImpl::stack2reg(sp_offset_in_slots), r->as_VMReg());
196 }
197
198 step_in_slots = Register::max_slots_per_register;
199 // skip the slot reserved for alignment, see MacroAssembler::push_reg;
200 // also skip x5 ~ x6 on the stack because they are caller-saved registers.
201 sp_offset_in_slots += Register::max_slots_per_register * 3;
202 // besides, we ignore x0 ~ x4 because push_CPU_state won't push them on the stack.
203 for (int i = 7; i < Register::number_of_registers; i++, sp_offset_in_slots += step_in_slots) {
204 Register r = as_Register(i);
205 if (r != xthread) {
206 oop_map->set_callee_saved(VMRegImpl::stack2reg(sp_offset_in_slots + additional_frame_slots), r->as_VMReg());
207 }
208 }
209
210 return oop_map;
211 }
212
213 void RegisterSaver::restore_live_registers(MacroAssembler* masm) {
214 #ifdef COMPILER2
215 __ pop_CPU_state(_save_vectors, Matcher::scalable_vector_reg_size(T_BYTE));
216 #else
217 #if !INCLUDE_JVMCI
218 assert(!_save_vectors, "vectors are generated only by C2 and JVMCI");
219 #endif
220 __ pop_CPU_state(_save_vectors);
221 #endif
222 __ leave();
223 }
224
225 // Is vector's size (in bytes) bigger than a size saved by default?
226 // riscv does not ovlerlay the floating-point registers on vector registers like aarch64.
227 bool SharedRuntime::is_wide_vector(int size) {
228 return UseRVV;
229 }
230
231 // ---------------------------------------------------------------------------
232 // Read the array of BasicTypes from a signature, and compute where the
233 // arguments should go. Values in the VMRegPair regs array refer to 4-byte
234 // quantities. Values less than VMRegImpl::stack0 are registers, those above
235 // refer to 4-byte stack slots. All stack slots are based off of the stack pointer
236 // as framesizes are fixed.
237 // VMRegImpl::stack0 refers to the first slot 0(sp).
238 // and VMRegImpl::stack0+1 refers to the memory word 4-byes higher.
239 // Register up to Register::number_of_registers) are the 64-bit
240 // integer registers.
241
242 // Note: the INPUTS in sig_bt are in units of Java argument words,
243 // which are 64-bit. The OUTPUTS are in 32-bit units.
244
245 // The Java calling convention is a "shifted" version of the C ABI.
246 // By skipping the first C ABI register we can call non-static jni
247 // methods with small numbers of arguments without having to shuffle
248 // the arguments at all. Since we control the java ABI we ought to at
249 // least get some advantage out of it.
250
251 int SharedRuntime::java_calling_convention(const BasicType *sig_bt,
252 VMRegPair *regs,
253 int total_args_passed) {
254 // Create the mapping between argument positions and
255 // registers.
256 static const Register INT_ArgReg[Argument::n_int_register_parameters_j] = {
257 j_rarg0, j_rarg1, j_rarg2, j_rarg3,
258 j_rarg4, j_rarg5, j_rarg6, j_rarg7
259 };
260 static const FloatRegister FP_ArgReg[Argument::n_float_register_parameters_j] = {
261 j_farg0, j_farg1, j_farg2, j_farg3,
262 j_farg4, j_farg5, j_farg6, j_farg7
263 };
264
265 uint int_args = 0;
266 uint fp_args = 0;
267 uint stk_args = 0;
268
269 for (int i = 0; i < total_args_passed; i++) {
270 switch (sig_bt[i]) {
271 case T_BOOLEAN: // fall through
272 case T_CHAR: // fall through
273 case T_BYTE: // fall through
274 case T_SHORT: // fall through
275 case T_INT:
276 if (int_args < Argument::n_int_register_parameters_j) {
277 regs[i].set1(INT_ArgReg[int_args++]->as_VMReg());
278 } else {
279 stk_args = align_up(stk_args, 2);
280 regs[i].set1(VMRegImpl::stack2reg(stk_args));
281 stk_args += 1;
282 }
283 break;
284 case T_VOID:
285 // halves of T_LONG or T_DOUBLE
286 assert(i != 0 && (sig_bt[i - 1] == T_LONG || sig_bt[i - 1] == T_DOUBLE), "expecting half");
287 regs[i].set_bad();
288 break;
289 case T_LONG: // fall through
290 assert((i + 1) < total_args_passed && sig_bt[i + 1] == T_VOID, "expecting half");
291 case T_OBJECT: // fall through
292 case T_ARRAY: // fall through
293 case T_ADDRESS:
294 if (int_args < Argument::n_int_register_parameters_j) {
295 regs[i].set2(INT_ArgReg[int_args++]->as_VMReg());
296 } else {
297 stk_args = align_up(stk_args, 2);
298 regs[i].set2(VMRegImpl::stack2reg(stk_args));
299 stk_args += 2;
300 }
301 break;
302 case T_FLOAT:
303 if (fp_args < Argument::n_float_register_parameters_j) {
304 regs[i].set1(FP_ArgReg[fp_args++]->as_VMReg());
305 } else {
306 stk_args = align_up(stk_args, 2);
307 regs[i].set1(VMRegImpl::stack2reg(stk_args));
308 stk_args += 1;
309 }
310 break;
311 case T_DOUBLE:
312 assert((i + 1) < total_args_passed && sig_bt[i + 1] == T_VOID, "expecting half");
313 if (fp_args < Argument::n_float_register_parameters_j) {
314 regs[i].set2(FP_ArgReg[fp_args++]->as_VMReg());
315 } else {
316 stk_args = align_up(stk_args, 2);
317 regs[i].set2(VMRegImpl::stack2reg(stk_args));
318 stk_args += 2;
319 }
320 break;
321 default:
322 ShouldNotReachHere();
323 }
324 }
325
326 return stk_args;
327 }
328
329 // Patch the callers callsite with entry to compiled code if it exists.
330 static void patch_callers_callsite(MacroAssembler *masm) {
331 Label L;
332 __ ld(t0, Address(xmethod, in_bytes(Method::code_offset())));
333 __ beqz(t0, L);
334
335 __ enter();
336 __ push_CPU_state();
337
338 // VM needs caller's callsite
339 // VM needs target method
340 // This needs to be a long call since we will relocate this adapter to
341 // the codeBuffer and it may not reach
342
343 #ifndef PRODUCT
344 assert(frame::arg_reg_save_area_bytes == 0, "not expecting frame reg save area");
345 #endif
346
347 __ mv(c_rarg0, xmethod);
348 __ mv(c_rarg1, ra);
349 __ rt_call(CAST_FROM_FN_PTR(address, SharedRuntime::fixup_callers_callsite));
350
351 __ pop_CPU_state();
352 // restore sp
353 __ leave();
354 __ bind(L);
355 }
356
357 static void gen_c2i_adapter(MacroAssembler *masm,
358 int total_args_passed,
359 int comp_args_on_stack,
360 const BasicType *sig_bt,
361 const VMRegPair *regs,
362 Label& skip_fixup) {
363 // Before we get into the guts of the C2I adapter, see if we should be here
364 // at all. We've come from compiled code and are attempting to jump to the
365 // interpreter, which means the caller made a static call to get here
366 // (vcalls always get a compiled target if there is one). Check for a
367 // compiled target. If there is one, we need to patch the caller's call.
368 patch_callers_callsite(masm);
369
370 __ bind(skip_fixup);
371
372 int words_pushed = 0;
373
374 // Since all args are passed on the stack, total_args_passed *
375 // Interpreter::stackElementSize is the space we need.
376
377 int extraspace = total_args_passed * Interpreter::stackElementSize;
378
379 __ mv(x19_sender_sp, sp);
380
381 // stack is aligned, keep it that way
382 extraspace = align_up(extraspace, 2 * wordSize);
383
384 if (extraspace) {
385 __ sub(sp, sp, extraspace);
386 }
387
388 // Now write the args into the outgoing interpreter space
389 for (int i = 0; i < total_args_passed; i++) {
390 if (sig_bt[i] == T_VOID) {
391 assert(i > 0 && (sig_bt[i - 1] == T_LONG || sig_bt[i - 1] == T_DOUBLE), "missing half");
392 continue;
393 }
394
395 // offset to start parameters
396 int st_off = (total_args_passed - i - 1) * Interpreter::stackElementSize;
397 int next_off = st_off - Interpreter::stackElementSize;
398
399 // Say 4 args:
400 // i st_off
401 // 0 32 T_LONG
402 // 1 24 T_VOID
403 // 2 16 T_OBJECT
404 // 3 8 T_BOOL
405 // - 0 return address
406 //
407 // However to make thing extra confusing. Because we can fit a Java long/double in
408 // a single slot on a 64 bt vm and it would be silly to break them up, the interpreter
409 // leaves one slot empty and only stores to a single slot. In this case the
410 // slot that is occupied is the T_VOID slot. See I said it was confusing.
411
412 VMReg r_1 = regs[i].first();
413 VMReg r_2 = regs[i].second();
414 if (!r_1->is_valid()) {
415 assert(!r_2->is_valid(), "");
416 continue;
417 }
418 if (r_1->is_stack()) {
419 // memory to memory use t0
420 int ld_off = (r_1->reg2stack() * VMRegImpl::stack_slot_size
421 + extraspace
422 + words_pushed * wordSize);
423 if (!r_2->is_valid()) {
424 __ lwu(t0, Address(sp, ld_off));
425 __ sd(t0, Address(sp, st_off), /*temp register*/esp);
426 } else {
427 __ ld(t0, Address(sp, ld_off), /*temp register*/esp);
428
429 // Two VMREgs|OptoRegs can be T_OBJECT, T_ADDRESS, T_DOUBLE, T_LONG
430 // T_DOUBLE and T_LONG use two slots in the interpreter
431 if (sig_bt[i] == T_LONG || sig_bt[i] == T_DOUBLE) {
432 // ld_off == LSW, ld_off+wordSize == MSW
433 // st_off == MSW, next_off == LSW
434 __ sd(t0, Address(sp, next_off), /*temp register*/esp);
435 #ifdef ASSERT
436 // Overwrite the unused slot with known junk
437 __ mv(t0, 0xdeadffffdeadaaaaul);
438 __ sd(t0, Address(sp, st_off), /*temp register*/esp);
439 #endif /* ASSERT */
440 } else {
441 __ sd(t0, Address(sp, st_off), /*temp register*/esp);
442 }
443 }
444 } else if (r_1->is_Register()) {
445 Register r = r_1->as_Register();
446 if (!r_2->is_valid()) {
447 // must be only an int (or less ) so move only 32bits to slot
448 __ sd(r, Address(sp, st_off));
449 } else {
450 // Two VMREgs|OptoRegs can be T_OBJECT, T_ADDRESS, T_DOUBLE, T_LONG
451 // T_DOUBLE and T_LONG use two slots in the interpreter
452 if ( sig_bt[i] == T_LONG || sig_bt[i] == T_DOUBLE) {
453 // long/double in gpr
454 #ifdef ASSERT
455 // Overwrite the unused slot with known junk
456 __ mv(t0, 0xdeadffffdeadaaabul);
457 __ sd(t0, Address(sp, st_off), /*temp register*/esp);
458 #endif /* ASSERT */
459 __ sd(r, Address(sp, next_off));
460 } else {
461 __ sd(r, Address(sp, st_off));
462 }
463 }
464 } else {
465 assert(r_1->is_FloatRegister(), "");
466 if (!r_2->is_valid()) {
467 // only a float use just part of the slot
468 __ fsw(r_1->as_FloatRegister(), Address(sp, st_off));
469 } else {
470 #ifdef ASSERT
471 // Overwrite the unused slot with known junk
472 __ mv(t0, 0xdeadffffdeadaaacul);
473 __ sd(t0, Address(sp, st_off), /*temp register*/esp);
474 #endif /* ASSERT */
475 __ fsd(r_1->as_FloatRegister(), Address(sp, next_off));
476 }
477 }
478 }
479
480 __ mv(esp, sp); // Interp expects args on caller's expression stack
481
482 __ ld(t0, Address(xmethod, in_bytes(Method::interpreter_entry_offset())));
483 __ jr(t0);
484 }
485
486 void SharedRuntime::gen_i2c_adapter(MacroAssembler *masm,
487 int total_args_passed,
488 int comp_args_on_stack,
489 const BasicType *sig_bt,
490 const VMRegPair *regs) {
491 // Note: x19_sender_sp contains the senderSP on entry. We must
492 // preserve it since we may do a i2c -> c2i transition if we lose a
493 // race where compiled code goes non-entrant while we get args
494 // ready.
495
496 // Cut-out for having no stack args.
497 int comp_words_on_stack = align_up(comp_args_on_stack * VMRegImpl::stack_slot_size, wordSize) >> LogBytesPerWord;
498 if (comp_args_on_stack != 0) {
499 __ sub(t0, sp, comp_words_on_stack * wordSize);
500 __ andi(sp, t0, -16);
501 }
502
503 // Will jump to the compiled code just as if compiled code was doing it.
504 // Pre-load the register-jump target early, to schedule it better.
505 __ ld(t1, Address(xmethod, in_bytes(Method::from_compiled_offset())));
506
507 #if INCLUDE_JVMCI
508 if (EnableJVMCI) {
509 // check if this call should be routed towards a specific entry point
510 __ ld(t0, Address(xthread, in_bytes(JavaThread::jvmci_alternate_call_target_offset())));
511 Label no_alternative_target;
512 __ beqz(t0, no_alternative_target);
513 __ mv(t1, t0);
514 __ sd(zr, Address(xthread, in_bytes(JavaThread::jvmci_alternate_call_target_offset())));
515 __ bind(no_alternative_target);
516 }
517 #endif // INCLUDE_JVMCI
518
519 // Now generate the shuffle code.
520 for (int i = 0; i < total_args_passed; i++) {
521 if (sig_bt[i] == T_VOID) {
522 assert(i > 0 && (sig_bt[i - 1] == T_LONG || sig_bt[i - 1] == T_DOUBLE), "missing half");
523 continue;
524 }
525
526 // Pick up 0, 1 or 2 words from SP+offset.
527
528 assert(!regs[i].second()->is_valid() || regs[i].first()->next() == regs[i].second(),
529 "scrambled load targets?");
530 // Load in argument order going down.
531 int ld_off = (total_args_passed - i - 1) * Interpreter::stackElementSize;
532 // Point to interpreter value (vs. tag)
533 int next_off = ld_off - Interpreter::stackElementSize;
534
535 VMReg r_1 = regs[i].first();
536 VMReg r_2 = regs[i].second();
537 if (!r_1->is_valid()) {
538 assert(!r_2->is_valid(), "");
539 continue;
540 }
541 if (r_1->is_stack()) {
542 // Convert stack slot to an SP offset (+ wordSize to account for return address )
543 int st_off = regs[i].first()->reg2stack() * VMRegImpl::stack_slot_size;
544 if (!r_2->is_valid()) {
545 __ lw(t0, Address(esp, ld_off));
546 __ sd(t0, Address(sp, st_off), /*temp register*/t2);
547 } else {
548 //
549 // We are using two optoregs. This can be either T_OBJECT,
550 // T_ADDRESS, T_LONG, or T_DOUBLE the interpreter allocates
551 // two slots but only uses one for thr T_LONG or T_DOUBLE case
552 // So we must adjust where to pick up the data to match the
553 // interpreter.
554 //
555 // Interpreter local[n] == MSW, local[n+1] == LSW however locals
556 // are accessed as negative so LSW is at LOW address
557
558 // ld_off is MSW so get LSW
559 const int offset = (sig_bt[i] == T_LONG || sig_bt[i] == T_DOUBLE) ?
560 next_off : ld_off;
561 __ ld(t0, Address(esp, offset));
562 // st_off is LSW (i.e. reg.first())
563 __ sd(t0, Address(sp, st_off), /*temp register*/t2);
564 }
565 } else if (r_1->is_Register()) { // Register argument
566 Register r = r_1->as_Register();
567 if (r_2->is_valid()) {
568 //
569 // We are using two VMRegs. This can be either T_OBJECT,
570 // T_ADDRESS, T_LONG, or T_DOUBLE the interpreter allocates
571 // two slots but only uses one for thr T_LONG or T_DOUBLE case
572 // So we must adjust where to pick up the data to match the
573 // interpreter.
574
575 const int offset = (sig_bt[i] == T_LONG || sig_bt[i] == T_DOUBLE) ?
576 next_off : ld_off;
577
578 // this can be a misaligned move
579 __ ld(r, Address(esp, offset));
580 } else {
581 // sign extend and use a full word?
582 __ lw(r, Address(esp, ld_off));
583 }
584 } else {
585 if (!r_2->is_valid()) {
586 __ flw(r_1->as_FloatRegister(), Address(esp, ld_off));
587 } else {
588 __ fld(r_1->as_FloatRegister(), Address(esp, next_off));
589 }
590 }
591 }
592
593 __ push_cont_fastpath(xthread); // Set JavaThread::_cont_fastpath to the sp of the oldest interpreted frame we know about
594
595 // 6243940 We might end up in handle_wrong_method if
596 // the callee is deoptimized as we race thru here. If that
597 // happens we don't want to take a safepoint because the
598 // caller frame will look interpreted and arguments are now
599 // "compiled" so it is much better to make this transition
600 // invisible to the stack walking code. Unfortunately if
601 // we try and find the callee by normal means a safepoint
602 // is possible. So we stash the desired callee in the thread
603 // and the vm will find there should this case occur.
604
605 __ sd(xmethod, Address(xthread, JavaThread::callee_target_offset()));
606
607 __ jr(t1);
608 }
609
610 // ---------------------------------------------------------------
611 AdapterHandlerEntry* SharedRuntime::generate_i2c2i_adapters(MacroAssembler *masm,
612 int total_args_passed,
613 int comp_args_on_stack,
614 const BasicType *sig_bt,
615 const VMRegPair *regs,
616 AdapterFingerPrint* fingerprint) {
617 address i2c_entry = __ pc();
618 gen_i2c_adapter(masm, total_args_passed, comp_args_on_stack, sig_bt, regs);
619
620 address c2i_unverified_entry = __ pc();
621 Label skip_fixup;
622
623 const Register receiver = j_rarg0;
624 const Register data = t1;
625 const Register tmp = t2; // A call-clobbered register not used for arg passing
626
627 // -------------------------------------------------------------------------
628 // Generate a C2I adapter. On entry we know xmethod holds the Method* during calls
629 // to the interpreter. The args start out packed in the compiled layout. They
630 // need to be unpacked into the interpreter layout. This will almost always
631 // require some stack space. We grow the current (compiled) stack, then repack
632 // the args. We finally end in a jump to the generic interpreter entry point.
633 // On exit from the interpreter, the interpreter will restore our SP (lest the
634 // compiled code, which relies solely on SP and not FP, get sick).
635
636 {
637 __ block_comment("c2i_unverified_entry {");
638
639 __ ic_check();
640 __ ld(xmethod, Address(data, CompiledICData::speculated_method_offset()));
641
642 __ ld(t0, Address(xmethod, in_bytes(Method::code_offset())));
643 __ beqz(t0, skip_fixup);
644 __ far_jump(RuntimeAddress(SharedRuntime::get_ic_miss_stub()));
645 __ block_comment("} c2i_unverified_entry");
646 }
647
648 address c2i_entry = __ pc();
649
650 // Class initialization barrier for static methods
651 address c2i_no_clinit_check_entry = nullptr;
652 if (VM_Version::supports_fast_class_init_checks()) {
653 Label L_skip_barrier;
654
655 { // Bypass the barrier for non-static methods
656 __ lwu(t0, Address(xmethod, Method::access_flags_offset()));
657 __ test_bit(t1, t0, exact_log2(JVM_ACC_STATIC));
658 __ beqz(t1, L_skip_barrier); // non-static
659 }
660
661 __ load_method_holder(t1, xmethod);
662 __ clinit_barrier(t1, t0, &L_skip_barrier);
663 __ far_jump(RuntimeAddress(SharedRuntime::get_handle_wrong_method_stub()));
664
665 __ bind(L_skip_barrier);
666 c2i_no_clinit_check_entry = __ pc();
667 }
668
669 BarrierSetAssembler* bs = BarrierSet::barrier_set()->barrier_set_assembler();
670 bs->c2i_entry_barrier(masm);
671
672 gen_c2i_adapter(masm, total_args_passed, comp_args_on_stack, sig_bt, regs, skip_fixup);
673
674 return AdapterHandlerLibrary::new_entry(fingerprint, i2c_entry, c2i_entry, c2i_unverified_entry, c2i_no_clinit_check_entry);
675 }
676
677 int SharedRuntime::vector_calling_convention(VMRegPair *regs,
678 uint num_bits,
679 uint total_args_passed) {
680 Unimplemented();
681 return 0;
682 }
683
684 int SharedRuntime::c_calling_convention(const BasicType *sig_bt,
685 VMRegPair *regs,
686 int total_args_passed) {
687
688 // We return the amount of VMRegImpl stack slots we need to reserve for all
689 // the arguments NOT counting out_preserve_stack_slots.
690
691 static const Register INT_ArgReg[Argument::n_int_register_parameters_c] = {
692 c_rarg0, c_rarg1, c_rarg2, c_rarg3,
693 c_rarg4, c_rarg5, c_rarg6, c_rarg7
694 };
695 static const FloatRegister FP_ArgReg[Argument::n_float_register_parameters_c] = {
696 c_farg0, c_farg1, c_farg2, c_farg3,
697 c_farg4, c_farg5, c_farg6, c_farg7
698 };
699
700 uint int_args = 0;
701 uint fp_args = 0;
702 uint stk_args = 0; // inc by 2 each time
703
704 for (int i = 0; i < total_args_passed; i++) {
705 switch (sig_bt[i]) {
706 case T_BOOLEAN: // fall through
707 case T_CHAR: // fall through
708 case T_BYTE: // fall through
709 case T_SHORT: // fall through
710 case T_INT:
711 if (int_args < Argument::n_int_register_parameters_c) {
712 regs[i].set1(INT_ArgReg[int_args++]->as_VMReg());
713 } else {
714 regs[i].set1(VMRegImpl::stack2reg(stk_args));
715 stk_args += 2;
716 }
717 break;
718 case T_LONG: // fall through
719 assert((i + 1) < total_args_passed && sig_bt[i + 1] == T_VOID, "expecting half");
720 case T_OBJECT: // fall through
721 case T_ARRAY: // fall through
722 case T_ADDRESS: // fall through
723 case T_METADATA:
724 if (int_args < Argument::n_int_register_parameters_c) {
725 regs[i].set2(INT_ArgReg[int_args++]->as_VMReg());
726 } else {
727 regs[i].set2(VMRegImpl::stack2reg(stk_args));
728 stk_args += 2;
729 }
730 break;
731 case T_FLOAT:
732 if (fp_args < Argument::n_float_register_parameters_c) {
733 regs[i].set1(FP_ArgReg[fp_args++]->as_VMReg());
734 } else if (int_args < Argument::n_int_register_parameters_c) {
735 regs[i].set1(INT_ArgReg[int_args++]->as_VMReg());
736 } else {
737 regs[i].set1(VMRegImpl::stack2reg(stk_args));
738 stk_args += 2;
739 }
740 break;
741 case T_DOUBLE:
742 assert((i + 1) < total_args_passed && sig_bt[i + 1] == T_VOID, "expecting half");
743 if (fp_args < Argument::n_float_register_parameters_c) {
744 regs[i].set2(FP_ArgReg[fp_args++]->as_VMReg());
745 } else if (int_args < Argument::n_int_register_parameters_c) {
746 regs[i].set2(INT_ArgReg[int_args++]->as_VMReg());
747 } else {
748 regs[i].set2(VMRegImpl::stack2reg(stk_args));
749 stk_args += 2;
750 }
751 break;
752 case T_VOID: // Halves of longs and doubles
753 assert(i != 0 && (sig_bt[i - 1] == T_LONG || sig_bt[i - 1] == T_DOUBLE), "expecting half");
754 regs[i].set_bad();
755 break;
756 default:
757 ShouldNotReachHere();
758 }
759 }
760
761 return stk_args;
762 }
763
764 void SharedRuntime::save_native_result(MacroAssembler *masm, BasicType ret_type, int frame_slots) {
765 // We always ignore the frame_slots arg and just use the space just below frame pointer
766 // which by this time is free to use
767 switch (ret_type) {
768 case T_FLOAT:
769 __ fsw(f10, Address(fp, -3 * wordSize));
770 break;
771 case T_DOUBLE:
772 __ fsd(f10, Address(fp, -3 * wordSize));
773 break;
774 case T_VOID: break;
775 default: {
776 __ sd(x10, Address(fp, -3 * wordSize));
777 }
778 }
779 }
780
781 void SharedRuntime::restore_native_result(MacroAssembler *masm, BasicType ret_type, int frame_slots) {
782 // We always ignore the frame_slots arg and just use the space just below frame pointer
783 // which by this time is free to use
784 switch (ret_type) {
785 case T_FLOAT:
786 __ flw(f10, Address(fp, -3 * wordSize));
787 break;
788 case T_DOUBLE:
789 __ fld(f10, Address(fp, -3 * wordSize));
790 break;
791 case T_VOID: break;
792 default: {
793 __ ld(x10, Address(fp, -3 * wordSize));
794 }
795 }
796 }
797
798 static void save_args(MacroAssembler *masm, int arg_count, int first_arg, VMRegPair *args) {
799 RegSet x;
800 for ( int i = first_arg ; i < arg_count ; i++ ) {
801 if (args[i].first()->is_Register()) {
802 x = x + args[i].first()->as_Register();
803 } else if (args[i].first()->is_FloatRegister()) {
804 __ addi(sp, sp, -2 * wordSize);
805 __ fsd(args[i].first()->as_FloatRegister(), Address(sp, 0));
806 }
807 }
808 __ push_reg(x, sp);
809 }
810
811 static void restore_args(MacroAssembler *masm, int arg_count, int first_arg, VMRegPair *args) {
812 RegSet x;
813 for ( int i = first_arg ; i < arg_count ; i++ ) {
814 if (args[i].first()->is_Register()) {
815 x = x + args[i].first()->as_Register();
816 } else {
817 ;
818 }
819 }
820 __ pop_reg(x, sp);
821 for ( int i = arg_count - 1 ; i >= first_arg ; i-- ) {
822 if (args[i].first()->is_Register()) {
823 ;
824 } else if (args[i].first()->is_FloatRegister()) {
825 __ fld(args[i].first()->as_FloatRegister(), Address(sp, 0));
826 __ add(sp, sp, 2 * wordSize);
827 }
828 }
829 }
830
831 static void verify_oop_args(MacroAssembler* masm,
832 const methodHandle& method,
833 const BasicType* sig_bt,
834 const VMRegPair* regs) {
835 const Register temp_reg = x9; // not part of any compiled calling seq
836 if (VerifyOops) {
837 for (int i = 0; i < method->size_of_parameters(); i++) {
838 if (sig_bt[i] == T_OBJECT ||
839 sig_bt[i] == T_ARRAY) {
840 VMReg r = regs[i].first();
841 assert(r->is_valid(), "bad oop arg");
842 if (r->is_stack()) {
843 __ ld(temp_reg, Address(sp, r->reg2stack() * VMRegImpl::stack_slot_size));
844 __ verify_oop(temp_reg);
845 } else {
846 __ verify_oop(r->as_Register());
847 }
848 }
849 }
850 }
851 }
852
853 // on exit, sp points to the ContinuationEntry
854 static OopMap* continuation_enter_setup(MacroAssembler* masm, int& stack_slots) {
855 assert(ContinuationEntry::size() % VMRegImpl::stack_slot_size == 0, "");
856 assert(in_bytes(ContinuationEntry::cont_offset()) % VMRegImpl::stack_slot_size == 0, "");
857 assert(in_bytes(ContinuationEntry::chunk_offset()) % VMRegImpl::stack_slot_size == 0, "");
858
859 stack_slots += (int)ContinuationEntry::size() / wordSize;
860 __ sub(sp, sp, (int)ContinuationEntry::size()); // place Continuation metadata
861
862 OopMap* map = new OopMap(((int)ContinuationEntry::size() + wordSize) / VMRegImpl::stack_slot_size, 0 /* arg_slots*/);
863
864 __ ld(t0, Address(xthread, JavaThread::cont_entry_offset()));
865 __ sd(t0, Address(sp, ContinuationEntry::parent_offset()));
866 __ sd(sp, Address(xthread, JavaThread::cont_entry_offset()));
867
868 return map;
869 }
870
871 // on entry c_rarg1 points to the continuation
872 // sp points to ContinuationEntry
873 // c_rarg3 -- isVirtualThread
874 static void fill_continuation_entry(MacroAssembler* masm) {
875 #ifdef ASSERT
876 __ mv(t0, ContinuationEntry::cookie_value());
877 __ sw(t0, Address(sp, ContinuationEntry::cookie_offset()));
878 #endif
879
880 __ sd(c_rarg1, Address(sp, ContinuationEntry::cont_offset()));
881 __ sw(c_rarg3, Address(sp, ContinuationEntry::flags_offset()));
882 __ sd(zr, Address(sp, ContinuationEntry::chunk_offset()));
883 __ sw(zr, Address(sp, ContinuationEntry::argsize_offset()));
884 __ sw(zr, Address(sp, ContinuationEntry::pin_count_offset()));
885
886 __ ld(t0, Address(xthread, JavaThread::cont_fastpath_offset()));
887 __ sd(t0, Address(sp, ContinuationEntry::parent_cont_fastpath_offset()));
888 __ ld(t0, Address(xthread, JavaThread::held_monitor_count_offset()));
889 __ sd(t0, Address(sp, ContinuationEntry::parent_held_monitor_count_offset()));
890
891 __ sd(zr, Address(xthread, JavaThread::cont_fastpath_offset()));
892 __ sd(zr, Address(xthread, JavaThread::held_monitor_count_offset()));
893 }
894
895 // on entry, sp points to the ContinuationEntry
896 // on exit, fp points to the spilled fp + 2 * wordSize in the entry frame
897 static void continuation_enter_cleanup(MacroAssembler* masm) {
898 #ifndef PRODUCT
899 Label OK;
900 __ ld(t0, Address(xthread, JavaThread::cont_entry_offset()));
901 __ beq(sp, t0, OK);
902 __ stop("incorrect sp");
903 __ bind(OK);
904 #endif
905
906 __ ld(t0, Address(sp, ContinuationEntry::parent_cont_fastpath_offset()));
907 __ sd(t0, Address(xthread, JavaThread::cont_fastpath_offset()));
908
909 if (CheckJNICalls) {
910 // Check if this is a virtual thread continuation
911 Label L_skip_vthread_code;
912 __ lwu(t0, Address(sp, ContinuationEntry::flags_offset()));
913 __ beqz(t0, L_skip_vthread_code);
914
915 // If the held monitor count is > 0 and this vthread is terminating then
916 // it failed to release a JNI monitor. So we issue the same log message
917 // that JavaThread::exit does.
918 __ ld(t0, Address(xthread, JavaThread::jni_monitor_count_offset()));
919 __ beqz(t0, L_skip_vthread_code);
920
921 // Save return value potentially containing the exception oop in callee-saved x9
922 __ mv(x9, x10);
923 __ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::log_jni_monitor_still_held));
924 // Restore potential return value
925 __ mv(x10, x9);
926
927 // For vthreads we have to explicitly zero the JNI monitor count of the carrier
928 // on termination. The held count is implicitly zeroed below when we restore from
929 // the parent held count (which has to be zero).
930 __ sd(zr, Address(xthread, JavaThread::jni_monitor_count_offset()));
931
932 __ bind(L_skip_vthread_code);
933 }
934 #ifdef ASSERT
935 else {
936 // Check if this is a virtual thread continuation
937 Label L_skip_vthread_code;
938 __ lwu(t0, Address(sp, ContinuationEntry::flags_offset()));
939 __ beqz(t0, L_skip_vthread_code);
940
941 // See comment just above. If not checking JNI calls the JNI count is only
942 // needed for assertion checking.
943 __ sd(zr, Address(xthread, JavaThread::jni_monitor_count_offset()));
944
945 __ bind(L_skip_vthread_code);
946 }
947 #endif
948
949 __ ld(t0, Address(sp, ContinuationEntry::parent_held_monitor_count_offset()));
950 __ sd(t0, Address(xthread, JavaThread::held_monitor_count_offset()));
951
952 __ ld(t0, Address(sp, ContinuationEntry::parent_offset()));
953 __ sd(t0, Address(xthread, JavaThread::cont_entry_offset()));
954 __ add(fp, sp, (int)ContinuationEntry::size() + 2 * wordSize /* 2 extra words to match up with leave() */);
955 }
956
957 // enterSpecial(Continuation c, boolean isContinue, boolean isVirtualThread)
958 // On entry: c_rarg1 -- the continuation object
959 // c_rarg2 -- isContinue
960 // c_rarg3 -- isVirtualThread
961 static void gen_continuation_enter(MacroAssembler* masm,
962 const methodHandle& method,
963 const BasicType* sig_bt,
964 const VMRegPair* regs,
965 int& exception_offset,
966 OopMapSet*oop_maps,
967 int& frame_complete,
968 int& stack_slots,
969 int& interpreted_entry_offset,
970 int& compiled_entry_offset) {
971 // verify_oop_args(masm, method, sig_bt, regs);
972 Address resolve(SharedRuntime::get_resolve_static_call_stub(), relocInfo::static_call_type);
973
974 address start = __ pc();
975
976 Label call_thaw, exit;
977
978 // i2i entry used at interp_only_mode only
979 interpreted_entry_offset = __ pc() - start;
980 {
981 #ifdef ASSERT
982 Label is_interp_only;
983 __ lw(t0, Address(xthread, JavaThread::interp_only_mode_offset()));
984 __ bnez(t0, is_interp_only);
985 __ stop("enterSpecial interpreter entry called when not in interp_only_mode");
986 __ bind(is_interp_only);
987 #endif
988
989 // Read interpreter arguments into registers (this is an ad-hoc i2c adapter)
990 __ ld(c_rarg1, Address(esp, Interpreter::stackElementSize * 2));
991 __ ld(c_rarg2, Address(esp, Interpreter::stackElementSize * 1));
992 __ ld(c_rarg3, Address(esp, Interpreter::stackElementSize * 0));
993 __ push_cont_fastpath(xthread);
994
995 __ enter();
996 stack_slots = 2; // will be adjusted in setup
997 OopMap* map = continuation_enter_setup(masm, stack_slots);
998 // The frame is complete here, but we only record it for the compiled entry, so the frame would appear unsafe,
999 // but that's okay because at the very worst we'll miss an async sample, but we're in interp_only_mode anyway.
1000
1001 fill_continuation_entry(masm);
1002
1003 __ bnez(c_rarg2, call_thaw);
1004
1005 // Make sure the call is patchable
1006 __ align(NativeInstruction::instruction_size);
1007
1008 const address tr_call = __ trampoline_call(resolve);
1009 if (tr_call == nullptr) {
1010 fatal("CodeCache is full at gen_continuation_enter");
1011 }
1012
1013 oop_maps->add_gc_map(__ pc() - start, map);
1014 __ post_call_nop();
1015
1016 __ j(exit);
1017
1018 address stub = CompiledDirectCall::emit_to_interp_stub(masm, tr_call);
1019 if (stub == nullptr) {
1020 fatal("CodeCache is full at gen_continuation_enter");
1021 }
1022 }
1023
1024 // compiled entry
1025 __ align(CodeEntryAlignment);
1026 compiled_entry_offset = __ pc() - start;
1027
1028 __ enter();
1029 stack_slots = 2; // will be adjusted in setup
1030 OopMap* map = continuation_enter_setup(masm, stack_slots);
1031 frame_complete = __ pc() - start;
1032
1033 fill_continuation_entry(masm);
1034
1035 __ bnez(c_rarg2, call_thaw);
1036
1037 // Make sure the call is patchable
1038 __ align(NativeInstruction::instruction_size);
1039
1040 const address tr_call = __ trampoline_call(resolve);
1041 if (tr_call == nullptr) {
1042 fatal("CodeCache is full at gen_continuation_enter");
1043 }
1044
1045 oop_maps->add_gc_map(__ pc() - start, map);
1046 __ post_call_nop();
1047
1048 __ j(exit);
1049
1050 __ bind(call_thaw);
1051
1052 __ rt_call(CAST_FROM_FN_PTR(address, StubRoutines::cont_thaw()));
1053 oop_maps->add_gc_map(__ pc() - start, map->deep_copy());
1054 ContinuationEntry::_return_pc_offset = __ pc() - start;
1055 __ post_call_nop();
1056
1057 __ bind(exit);
1058 continuation_enter_cleanup(masm);
1059 __ leave();
1060 __ ret();
1061
1062 // exception handling
1063 exception_offset = __ pc() - start;
1064 {
1065 __ mv(x9, x10); // save return value contaning the exception oop in callee-saved x9
1066
1067 continuation_enter_cleanup(masm);
1068
1069 __ ld(c_rarg1, Address(fp, -1 * wordSize)); // return address
1070 __ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::exception_handler_for_return_address), xthread, c_rarg1);
1071
1072 // see OptoRuntime::generate_exception_blob: x10 -- exception oop, x13 -- exception pc
1073
1074 __ mv(x11, x10); // the exception handler
1075 __ mv(x10, x9); // restore return value contaning the exception oop
1076 __ verify_oop(x10);
1077
1078 __ leave();
1079 __ mv(x13, ra);
1080 __ jr(x11); // the exception handler
1081 }
1082
1083 address stub = CompiledDirectCall::emit_to_interp_stub(masm, tr_call);
1084 if (stub == nullptr) {
1085 fatal("CodeCache is full at gen_continuation_enter");
1086 }
1087 }
1088
1089 static void gen_continuation_yield(MacroAssembler* masm,
1090 const methodHandle& method,
1091 const BasicType* sig_bt,
1092 const VMRegPair* regs,
1093 OopMapSet* oop_maps,
1094 int& frame_complete,
1095 int& stack_slots,
1096 int& compiled_entry_offset) {
1097 enum layout {
1098 fp_off,
1099 fp_off2,
1100 return_off,
1101 return_off2,
1102 framesize // inclusive of return address
1103 };
1104 // assert(is_even(framesize/2), "sp not 16-byte aligned");
1105
1106 stack_slots = framesize / VMRegImpl::slots_per_word;
1107 assert(stack_slots == 2, "recheck layout");
1108
1109 address start = __ pc();
1110
1111 compiled_entry_offset = __ pc() - start;
1112 __ enter();
1113
1114 __ mv(c_rarg1, sp);
1115
1116 frame_complete = __ pc() - start;
1117 address the_pc = __ pc();
1118
1119 __ 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
1120
1121 __ mv(c_rarg0, xthread);
1122 __ set_last_Java_frame(sp, fp, the_pc, t0);
1123 __ call_VM_leaf(Continuation::freeze_entry(), 2);
1124 __ reset_last_Java_frame(true);
1125
1126 Label pinned;
1127
1128 __ bnez(x10, pinned);
1129
1130 // We've succeeded, set sp to the ContinuationEntry
1131 __ ld(sp, Address(xthread, JavaThread::cont_entry_offset()));
1132 continuation_enter_cleanup(masm);
1133
1134 __ bind(pinned); // pinned -- return to caller
1135
1136 // handle pending exception thrown by freeze
1137 __ ld(t0, Address(xthread, in_bytes(Thread::pending_exception_offset())));
1138 Label ok;
1139 __ beqz(t0, ok);
1140 __ leave();
1141 __ la(t0, RuntimeAddress(StubRoutines::forward_exception_entry()));
1142 __ jr(t0);
1143 __ bind(ok);
1144
1145 __ leave();
1146 __ ret();
1147
1148 OopMap* map = new OopMap(framesize, 1);
1149 oop_maps->add_gc_map(the_pc - start, map);
1150 }
1151
1152 static void gen_special_dispatch(MacroAssembler* masm,
1153 const methodHandle& method,
1154 const BasicType* sig_bt,
1155 const VMRegPair* regs) {
1156 verify_oop_args(masm, method, sig_bt, regs);
1157 vmIntrinsics::ID iid = method->intrinsic_id();
1158
1159 // Now write the args into the outgoing interpreter space
1160 bool has_receiver = false;
1161 Register receiver_reg = noreg;
1162 int member_arg_pos = -1;
1163 Register member_reg = noreg;
1164 int ref_kind = MethodHandles::signature_polymorphic_intrinsic_ref_kind(iid);
1165 if (ref_kind != 0) {
1166 member_arg_pos = method->size_of_parameters() - 1; // trailing MemberName argument
1167 member_reg = x9; // known to be free at this point
1168 has_receiver = MethodHandles::ref_kind_has_receiver(ref_kind);
1169 } else if (iid == vmIntrinsics::_invokeBasic) {
1170 has_receiver = true;
1171 } else if (iid == vmIntrinsics::_linkToNative) {
1172 member_arg_pos = method->size_of_parameters() - 1; // trailing NativeEntryPoint argument
1173 member_reg = x9; // known to be free at this point
1174 } else {
1175 fatal("unexpected intrinsic id %d", vmIntrinsics::as_int(iid));
1176 }
1177
1178 if (member_reg != noreg) {
1179 // Load the member_arg into register, if necessary.
1180 SharedRuntime::check_member_name_argument_is_last_argument(method, sig_bt, regs);
1181 VMReg r = regs[member_arg_pos].first();
1182 if (r->is_stack()) {
1183 __ ld(member_reg, Address(sp, r->reg2stack() * VMRegImpl::stack_slot_size));
1184 } else {
1185 // no data motion is needed
1186 member_reg = r->as_Register();
1187 }
1188 }
1189
1190 if (has_receiver) {
1191 // Make sure the receiver is loaded into a register.
1192 assert(method->size_of_parameters() > 0, "oob");
1193 assert(sig_bt[0] == T_OBJECT, "receiver argument must be an object");
1194 VMReg r = regs[0].first();
1195 assert(r->is_valid(), "bad receiver arg");
1196 if (r->is_stack()) {
1197 // Porting note: This assumes that compiled calling conventions always
1198 // pass the receiver oop in a register. If this is not true on some
1199 // platform, pick a temp and load the receiver from stack.
1200 fatal("receiver always in a register");
1201 receiver_reg = x12; // known to be free at this point
1202 __ ld(receiver_reg, Address(sp, r->reg2stack() * VMRegImpl::stack_slot_size));
1203 } else {
1204 // no data motion is needed
1205 receiver_reg = r->as_Register();
1206 }
1207 }
1208
1209 // Figure out which address we are really jumping to:
1210 MethodHandles::generate_method_handle_dispatch(masm, iid,
1211 receiver_reg, member_reg, /*for_compiler_entry:*/ true);
1212 }
1213
1214 // ---------------------------------------------------------------------------
1215 // Generate a native wrapper for a given method. The method takes arguments
1216 // in the Java compiled code convention, marshals them to the native
1217 // convention (handlizes oops, etc), transitions to native, makes the call,
1218 // returns to java state (possibly blocking), unhandlizes any result and
1219 // returns.
1220 //
1221 // Critical native functions are a shorthand for the use of
1222 // GetPrimtiveArrayCritical and disallow the use of any other JNI
1223 // functions. The wrapper is expected to unpack the arguments before
1224 // passing them to the callee and perform checks before and after the
1225 // native call to ensure that they GCLocker
1226 // lock_critical/unlock_critical semantics are followed. Some other
1227 // parts of JNI setup are skipped like the tear down of the JNI handle
1228 // block and the check for pending exceptions it's impossible for them
1229 // to be thrown.
1230 //
1231 // They are roughly structured like this:
1232 // if (GCLocker::needs_gc()) SharedRuntime::block_for_jni_critical()
1233 // tranistion to thread_in_native
1234 // unpack array arguments and call native entry point
1235 // check for safepoint in progress
1236 // check if any thread suspend flags are set
1237 // call into JVM and possible unlock the JNI critical
1238 // if a GC was suppressed while in the critical native.
1239 // transition back to thread_in_Java
1240 // return to caller
1241 //
1242 nmethod* SharedRuntime::generate_native_wrapper(MacroAssembler* masm,
1243 const methodHandle& method,
1244 int compile_id,
1245 BasicType* in_sig_bt,
1246 VMRegPair* in_regs,
1247 BasicType ret_type) {
1248 if (method->is_continuation_native_intrinsic()) {
1249 int exception_offset = -1;
1250 OopMapSet* oop_maps = new OopMapSet();
1251 int frame_complete = -1;
1252 int stack_slots = -1;
1253 int interpreted_entry_offset = -1;
1254 int vep_offset = -1;
1255 if (method->is_continuation_enter_intrinsic()) {
1256 gen_continuation_enter(masm,
1257 method,
1258 in_sig_bt,
1259 in_regs,
1260 exception_offset,
1261 oop_maps,
1262 frame_complete,
1263 stack_slots,
1264 interpreted_entry_offset,
1265 vep_offset);
1266 } else if (method->is_continuation_yield_intrinsic()) {
1267 gen_continuation_yield(masm,
1268 method,
1269 in_sig_bt,
1270 in_regs,
1271 oop_maps,
1272 frame_complete,
1273 stack_slots,
1274 vep_offset);
1275 } else {
1276 guarantee(false, "Unknown Continuation native intrinsic");
1277 }
1278
1279 #ifdef ASSERT
1280 if (method->is_continuation_enter_intrinsic()) {
1281 assert(interpreted_entry_offset != -1, "Must be set");
1282 assert(exception_offset != -1, "Must be set");
1283 } else {
1284 assert(interpreted_entry_offset == -1, "Must be unset");
1285 assert(exception_offset == -1, "Must be unset");
1286 }
1287 assert(frame_complete != -1, "Must be set");
1288 assert(stack_slots != -1, "Must be set");
1289 assert(vep_offset != -1, "Must be set");
1290 #endif
1291
1292 __ flush();
1293 nmethod* nm = nmethod::new_native_nmethod(method,
1294 compile_id,
1295 masm->code(),
1296 vep_offset,
1297 frame_complete,
1298 stack_slots,
1299 in_ByteSize(-1),
1300 in_ByteSize(-1),
1301 oop_maps,
1302 exception_offset);
1303 if (nm == nullptr) return nm;
1304 if (method->is_continuation_enter_intrinsic()) {
1305 ContinuationEntry::set_enter_code(nm, interpreted_entry_offset);
1306 } else if (method->is_continuation_yield_intrinsic()) {
1307 _cont_doYield_stub = nm;
1308 } else {
1309 guarantee(false, "Unknown Continuation native intrinsic");
1310 }
1311 return nm;
1312 }
1313
1314 if (method->is_method_handle_intrinsic()) {
1315 vmIntrinsics::ID iid = method->intrinsic_id();
1316 intptr_t start = (intptr_t)__ pc();
1317 int vep_offset = ((intptr_t)__ pc()) - start;
1318
1319 // First instruction must be a nop as it may need to be patched on deoptimisation
1320 {
1321 Assembler::IncompressibleRegion ir(masm); // keep the nop as 4 bytes for patching.
1322 MacroAssembler::assert_alignment(__ pc());
1323 __ nop(); // 4 bytes
1324 }
1325 gen_special_dispatch(masm,
1326 method,
1327 in_sig_bt,
1328 in_regs);
1329 int frame_complete = ((intptr_t)__ pc()) - start; // not complete, period
1330 __ flush();
1331 int stack_slots = SharedRuntime::out_preserve_stack_slots(); // no out slots at all, actually
1332 return nmethod::new_native_nmethod(method,
1333 compile_id,
1334 masm->code(),
1335 vep_offset,
1336 frame_complete,
1337 stack_slots / VMRegImpl::slots_per_word,
1338 in_ByteSize(-1),
1339 in_ByteSize(-1),
1340 (OopMapSet*)nullptr);
1341 }
1342 address native_func = method->native_function();
1343 assert(native_func != nullptr, "must have function");
1344
1345 // An OopMap for lock (and class if static)
1346 OopMapSet *oop_maps = new OopMapSet();
1347 assert_cond(oop_maps != nullptr);
1348 intptr_t start = (intptr_t)__ pc();
1349
1350 // We have received a description of where all the java arg are located
1351 // on entry to the wrapper. We need to convert these args to where
1352 // the jni function will expect them. To figure out where they go
1353 // we convert the java signature to a C signature by inserting
1354 // the hidden arguments as arg[0] and possibly arg[1] (static method)
1355
1356 const int total_in_args = method->size_of_parameters();
1357 int total_c_args = total_in_args + (method->is_static() ? 2 : 1);
1358
1359 BasicType* out_sig_bt = NEW_RESOURCE_ARRAY(BasicType, total_c_args);
1360 VMRegPair* out_regs = NEW_RESOURCE_ARRAY(VMRegPair, total_c_args);
1361 BasicType* in_elem_bt = nullptr;
1362
1363 int argc = 0;
1364 out_sig_bt[argc++] = T_ADDRESS;
1365 if (method->is_static()) {
1366 out_sig_bt[argc++] = T_OBJECT;
1367 }
1368
1369 for (int i = 0; i < total_in_args ; i++) {
1370 out_sig_bt[argc++] = in_sig_bt[i];
1371 }
1372
1373 // Now figure out where the args must be stored and how much stack space
1374 // they require.
1375 int out_arg_slots = c_calling_convention(out_sig_bt, out_regs, total_c_args);
1376
1377 // Compute framesize for the wrapper. We need to handlize all oops in
1378 // incoming registers
1379
1380 // Calculate the total number of stack slots we will need.
1381
1382 // First count the abi requirement plus all of the outgoing args
1383 int stack_slots = SharedRuntime::out_preserve_stack_slots() + out_arg_slots;
1384
1385 // Now the space for the inbound oop handle area
1386 int total_save_slots = 8 * VMRegImpl::slots_per_word; // 8 arguments passed in registers
1387
1388 int oop_handle_offset = stack_slots;
1389 stack_slots += total_save_slots;
1390
1391 // Now any space we need for handlizing a klass if static method
1392
1393 int klass_slot_offset = 0;
1394 int klass_offset = -1;
1395 int lock_slot_offset = 0;
1396 bool is_static = false;
1397
1398 if (method->is_static()) {
1399 klass_slot_offset = stack_slots;
1400 stack_slots += VMRegImpl::slots_per_word;
1401 klass_offset = klass_slot_offset * VMRegImpl::stack_slot_size;
1402 is_static = true;
1403 }
1404
1405 // Plus a lock if needed
1406
1407 if (method->is_synchronized()) {
1408 lock_slot_offset = stack_slots;
1409 stack_slots += VMRegImpl::slots_per_word;
1410 }
1411
1412 // Now a place (+2) to save return values or temp during shuffling
1413 // + 4 for return address (which we own) and saved fp
1414 stack_slots += 6;
1415
1416 // Ok The space we have allocated will look like:
1417 //
1418 //
1419 // FP-> | |
1420 // | 2 slots (ra) |
1421 // | 2 slots (fp) |
1422 // |---------------------|
1423 // | 2 slots for moves |
1424 // |---------------------|
1425 // | lock box (if sync) |
1426 // |---------------------| <- lock_slot_offset
1427 // | klass (if static) |
1428 // |---------------------| <- klass_slot_offset
1429 // | oopHandle area |
1430 // |---------------------| <- oop_handle_offset (8 java arg registers)
1431 // | outbound memory |
1432 // | based arguments |
1433 // | |
1434 // |---------------------|
1435 // | |
1436 // SP-> | out_preserved_slots |
1437 //
1438 //
1439
1440
1441 // Now compute actual number of stack words we need rounding to make
1442 // stack properly aligned.
1443 stack_slots = align_up(stack_slots, StackAlignmentInSlots);
1444
1445 int stack_size = stack_slots * VMRegImpl::stack_slot_size;
1446
1447 // First thing make an ic check to see if we should even be here
1448
1449 // We are free to use all registers as temps without saving them and
1450 // restoring them except fp. fp is the only callee save register
1451 // as far as the interpreter and the compiler(s) are concerned.
1452
1453
1454 const Register ic_reg = t1;
1455 const Register receiver = j_rarg0;
1456
1457 __ verify_oop(receiver);
1458 assert_different_registers(receiver, t0, t1);
1459
1460 __ ic_check();
1461
1462 int vep_offset = ((intptr_t)__ pc()) - start;
1463
1464 // If we have to make this method not-entrant we'll overwrite its
1465 // first instruction with a jump.
1466 {
1467 Assembler::IncompressibleRegion ir(masm); // keep the nop as 4 bytes for patching.
1468 MacroAssembler::assert_alignment(__ pc());
1469 __ nop(); // 4 bytes
1470 }
1471
1472 if (VM_Version::supports_fast_class_init_checks() && method->needs_clinit_barrier()) {
1473 Label L_skip_barrier;
1474 __ mov_metadata(t1, method->method_holder()); // InstanceKlass*
1475 __ clinit_barrier(t1, t0, &L_skip_barrier);
1476 __ far_jump(RuntimeAddress(SharedRuntime::get_handle_wrong_method_stub()));
1477
1478 __ bind(L_skip_barrier);
1479 }
1480
1481 // Generate stack overflow check
1482 __ bang_stack_with_offset(checked_cast<int>(StackOverflow::stack_shadow_zone_size()));
1483
1484 // Generate a new frame for the wrapper.
1485 __ enter();
1486 // -2 because return address is already present and so is saved fp
1487 __ sub(sp, sp, stack_size - 2 * wordSize);
1488
1489 BarrierSetAssembler* bs = BarrierSet::barrier_set()->barrier_set_assembler();
1490 assert_cond(bs != nullptr);
1491 bs->nmethod_entry_barrier(masm, nullptr /* slow_path */, nullptr /* continuation */, nullptr /* guard */);
1492
1493 // Frame is now completed as far as size and linkage.
1494 int frame_complete = ((intptr_t)__ pc()) - start;
1495
1496 // We use x18 as the oop handle for the receiver/klass
1497 // It is callee save so it survives the call to native
1498
1499 const Register oop_handle_reg = x18;
1500
1501 //
1502 // We immediately shuffle the arguments so that any vm call we have to
1503 // make from here on out (sync slow path, jvmti, etc.) we will have
1504 // captured the oops from our caller and have a valid oopMap for
1505 // them.
1506
1507 // -----------------
1508 // The Grand Shuffle
1509
1510 // The Java calling convention is either equal (linux) or denser (win64) than the
1511 // c calling convention. However the because of the jni_env argument the c calling
1512 // convention always has at least one more (and two for static) arguments than Java.
1513 // Therefore if we move the args from java -> c backwards then we will never have
1514 // a register->register conflict and we don't have to build a dependency graph
1515 // and figure out how to break any cycles.
1516 //
1517
1518 // Record esp-based slot for receiver on stack for non-static methods
1519 int receiver_offset = -1;
1520
1521 // This is a trick. We double the stack slots so we can claim
1522 // the oops in the caller's frame. Since we are sure to have
1523 // more args than the caller doubling is enough to make
1524 // sure we can capture all the incoming oop args from the
1525 // caller.
1526 //
1527 OopMap* map = new OopMap(stack_slots * 2, 0 /* arg_slots*/);
1528 assert_cond(map != nullptr);
1529
1530 int float_args = 0;
1531 int int_args = 0;
1532
1533 #ifdef ASSERT
1534 bool reg_destroyed[Register::number_of_registers];
1535 bool freg_destroyed[FloatRegister::number_of_registers];
1536 for ( int r = 0 ; r < Register::number_of_registers ; r++ ) {
1537 reg_destroyed[r] = false;
1538 }
1539 for ( int f = 0 ; f < FloatRegister::number_of_registers ; f++ ) {
1540 freg_destroyed[f] = false;
1541 }
1542
1543 #endif /* ASSERT */
1544
1545 // For JNI natives the incoming and outgoing registers are offset upwards.
1546 GrowableArray<int> arg_order(2 * total_in_args);
1547 VMRegPair tmp_vmreg;
1548 tmp_vmreg.set2(x9->as_VMReg());
1549
1550 for (int i = total_in_args - 1, c_arg = total_c_args - 1; i >= 0; i--, c_arg--) {
1551 arg_order.push(i);
1552 arg_order.push(c_arg);
1553 }
1554
1555 int temploc = -1;
1556 for (int ai = 0; ai < arg_order.length(); ai += 2) {
1557 int i = arg_order.at(ai);
1558 int c_arg = arg_order.at(ai + 1);
1559 __ block_comment(err_msg("mv %d -> %d", i, c_arg));
1560 assert(c_arg != -1 && i != -1, "wrong order");
1561 #ifdef ASSERT
1562 if (in_regs[i].first()->is_Register()) {
1563 assert(!reg_destroyed[in_regs[i].first()->as_Register()->encoding()], "destroyed reg!");
1564 } else if (in_regs[i].first()->is_FloatRegister()) {
1565 assert(!freg_destroyed[in_regs[i].first()->as_FloatRegister()->encoding()], "destroyed reg!");
1566 }
1567 if (out_regs[c_arg].first()->is_Register()) {
1568 reg_destroyed[out_regs[c_arg].first()->as_Register()->encoding()] = true;
1569 } else if (out_regs[c_arg].first()->is_FloatRegister()) {
1570 freg_destroyed[out_regs[c_arg].first()->as_FloatRegister()->encoding()] = true;
1571 }
1572 #endif /* ASSERT */
1573 switch (in_sig_bt[i]) {
1574 case T_ARRAY:
1575 case T_OBJECT:
1576 __ object_move(map, oop_handle_offset, stack_slots, in_regs[i], out_regs[c_arg],
1577 ((i == 0) && (!is_static)),
1578 &receiver_offset);
1579 int_args++;
1580 break;
1581 case T_VOID:
1582 break;
1583
1584 case T_FLOAT:
1585 __ float_move(in_regs[i], out_regs[c_arg]);
1586 float_args++;
1587 break;
1588
1589 case T_DOUBLE:
1590 assert( i + 1 < total_in_args &&
1591 in_sig_bt[i + 1] == T_VOID &&
1592 out_sig_bt[c_arg + 1] == T_VOID, "bad arg list");
1593 __ double_move(in_regs[i], out_regs[c_arg]);
1594 float_args++;
1595 break;
1596
1597 case T_LONG :
1598 __ long_move(in_regs[i], out_regs[c_arg]);
1599 int_args++;
1600 break;
1601
1602 case T_ADDRESS:
1603 assert(false, "found T_ADDRESS in java args");
1604 break;
1605
1606 default:
1607 __ move32_64(in_regs[i], out_regs[c_arg]);
1608 int_args++;
1609 }
1610 }
1611
1612 // point c_arg at the first arg that is already loaded in case we
1613 // need to spill before we call out
1614 int c_arg = total_c_args - total_in_args;
1615
1616 // Pre-load a static method's oop into c_rarg1.
1617 if (method->is_static()) {
1618
1619 // load oop into a register
1620 __ movoop(c_rarg1,
1621 JNIHandles::make_local(method->method_holder()->java_mirror()));
1622
1623 // Now handlize the static class mirror it's known not-null.
1624 __ sd(c_rarg1, Address(sp, klass_offset));
1625 map->set_oop(VMRegImpl::stack2reg(klass_slot_offset));
1626
1627 // Now get the handle
1628 __ la(c_rarg1, Address(sp, klass_offset));
1629 // and protect the arg if we must spill
1630 c_arg--;
1631 }
1632
1633 // Change state to native (we save the return address in the thread, since it might not
1634 // be pushed on the stack when we do a stack traversal).
1635 // We use the same pc/oopMap repeatedly when we call out
1636
1637 Label native_return;
1638 __ set_last_Java_frame(sp, noreg, native_return, t0);
1639
1640 Label dtrace_method_entry, dtrace_method_entry_done;
1641 {
1642 ExternalAddress target((address)&DTraceMethodProbes);
1643 __ relocate(target.rspec(), [&] {
1644 int32_t offset;
1645 __ la(t0, target.target(), offset);
1646 __ lbu(t0, Address(t0, offset));
1647 });
1648 __ bnez(t0, dtrace_method_entry);
1649 __ bind(dtrace_method_entry_done);
1650 }
1651
1652 // RedefineClasses() tracing support for obsolete method entry
1653 if (log_is_enabled(Trace, redefine, class, obsolete)) {
1654 // protect the args we've loaded
1655 save_args(masm, total_c_args, c_arg, out_regs);
1656 __ mov_metadata(c_rarg1, method());
1657 __ call_VM_leaf(
1658 CAST_FROM_FN_PTR(address, SharedRuntime::rc_trace_method_entry),
1659 xthread, c_rarg1);
1660 restore_args(masm, total_c_args, c_arg, out_regs);
1661 }
1662
1663 // Lock a synchronized method
1664
1665 // Register definitions used by locking and unlocking
1666
1667 const Register swap_reg = x10;
1668 const Register obj_reg = x9; // Will contain the oop
1669 const Register lock_reg = x30; // Address of compiler lock object (BasicLock)
1670 const Register old_hdr = x30; // value of old header at unlock time
1671 const Register lock_tmp = x31; // Temporary used by lightweight_lock/unlock
1672 const Register tmp = ra;
1673
1674 Label slow_path_lock;
1675 Label lock_done;
1676
1677 if (method->is_synchronized()) {
1678 Label count;
1679
1680 const int mark_word_offset = BasicLock::displaced_header_offset_in_bytes();
1681
1682 // Get the handle (the 2nd argument)
1683 __ mv(oop_handle_reg, c_rarg1);
1684
1685 // Get address of the box
1686
1687 __ la(lock_reg, Address(sp, lock_slot_offset * VMRegImpl::stack_slot_size));
1688
1689 // Load the oop from the handle
1690 __ ld(obj_reg, Address(oop_handle_reg, 0));
1691
1692 if (LockingMode == LM_MONITOR) {
1693 __ j(slow_path_lock);
1694 } else if (LockingMode == LM_LEGACY) {
1695 // Load (object->mark() | 1) into swap_reg % x10
1696 __ ld(t0, Address(obj_reg, oopDesc::mark_offset_in_bytes()));
1697 __ ori(swap_reg, t0, 1);
1698
1699 // Save (object->mark() | 1) into BasicLock's displaced header
1700 __ sd(swap_reg, Address(lock_reg, mark_word_offset));
1701
1702 // src -> dest if dest == x10 else x10 <- dest
1703 __ cmpxchg_obj_header(x10, lock_reg, obj_reg, lock_tmp, count, /*fallthrough*/nullptr);
1704
1705 // Test if the oopMark is an obvious stack pointer, i.e.,
1706 // 1) (mark & 3) == 0, and
1707 // 2) sp <= mark < mark + os::pagesize()
1708 // These 3 tests can be done by evaluating the following
1709 // expression: ((mark - sp) & (3 - os::vm_page_size())),
1710 // assuming both stack pointer and pagesize have their
1711 // least significant 2 bits clear.
1712 // NOTE: the oopMark is in swap_reg % 10 as the result of cmpxchg
1713
1714 __ sub(swap_reg, swap_reg, sp);
1715 __ andi(swap_reg, swap_reg, 3 - (int)os::vm_page_size());
1716
1717 // Save the test result, for recursive case, the result is zero
1718 __ sd(swap_reg, Address(lock_reg, mark_word_offset));
1719 __ bnez(swap_reg, slow_path_lock);
1720 } else {
1721 assert(LockingMode == LM_LIGHTWEIGHT, "must be");
1722 __ lightweight_lock(obj_reg, swap_reg, tmp, lock_tmp, slow_path_lock);
1723 }
1724
1725 __ bind(count);
1726 __ increment(Address(xthread, JavaThread::held_monitor_count_offset()));
1727
1728 // Slow path will re-enter here
1729 __ bind(lock_done);
1730 }
1731
1732
1733 // Finally just about ready to make the JNI call
1734
1735 // get JNIEnv* which is first argument to native
1736 __ la(c_rarg0, Address(xthread, in_bytes(JavaThread::jni_environment_offset())));
1737
1738 // Now set thread in native
1739 __ la(t1, Address(xthread, JavaThread::thread_state_offset()));
1740 __ mv(t0, _thread_in_native);
1741 __ membar(MacroAssembler::LoadStore | MacroAssembler::StoreStore);
1742 __ sw(t0, Address(t1));
1743
1744 __ rt_call(native_func);
1745
1746 __ bind(native_return);
1747
1748 intptr_t return_pc = (intptr_t) __ pc();
1749 oop_maps->add_gc_map(return_pc - start, map);
1750
1751 // Verify or restore cpu control state after JNI call
1752 __ restore_cpu_control_state_after_jni(t0);
1753
1754 // Unpack native results.
1755 if (ret_type != T_OBJECT && ret_type != T_ARRAY) {
1756 __ cast_primitive_type(ret_type, x10);
1757 }
1758
1759 Label safepoint_in_progress, safepoint_in_progress_done;
1760 Label after_transition;
1761
1762 // Switch thread to "native transition" state before reading the synchronization state.
1763 // This additional state is necessary because reading and testing the synchronization
1764 // state is not atomic w.r.t. GC, as this scenario demonstrates:
1765 // Java thread A, in _thread_in_native state, loads _not_synchronized and is preempted.
1766 // VM thread changes sync state to synchronizing and suspends threads for GC.
1767 // Thread A is resumed to finish this native method, but doesn't block here since it
1768 // didn't see any synchronization is progress, and escapes.
1769 __ mv(t0, _thread_in_native_trans);
1770
1771 __ sw(t0, Address(xthread, JavaThread::thread_state_offset()));
1772
1773 // Force this write out before the read below
1774 if (!UseSystemMemoryBarrier) {
1775 __ membar(MacroAssembler::AnyAny);
1776 }
1777
1778 // check for safepoint operation in progress and/or pending suspend requests
1779 {
1780 // We need an acquire here to ensure that any subsequent load of the
1781 // global SafepointSynchronize::_state flag is ordered after this load
1782 // of the thread-local polling word. We don't want this poll to
1783 // return false (i.e. not safepointing) and a later poll of the global
1784 // SafepointSynchronize::_state spuriously to return true.
1785 // This is to avoid a race when we're in a native->Java transition
1786 // racing the code which wakes up from a safepoint.
1787
1788 __ safepoint_poll(safepoint_in_progress, true /* at_return */, true /* acquire */, false /* in_nmethod */);
1789 __ lwu(t0, Address(xthread, JavaThread::suspend_flags_offset()));
1790 __ bnez(t0, safepoint_in_progress);
1791 __ bind(safepoint_in_progress_done);
1792 }
1793
1794 // change thread state
1795 __ la(t1, Address(xthread, JavaThread::thread_state_offset()));
1796 __ mv(t0, _thread_in_Java);
1797 __ membar(MacroAssembler::LoadStore | MacroAssembler::StoreStore);
1798 __ sw(t0, Address(t1));
1799 __ bind(after_transition);
1800
1801 Label reguard;
1802 Label reguard_done;
1803 __ lbu(t0, Address(xthread, JavaThread::stack_guard_state_offset()));
1804 __ mv(t1, StackOverflow::stack_guard_yellow_reserved_disabled);
1805 __ beq(t0, t1, reguard);
1806 __ bind(reguard_done);
1807
1808 // native result if any is live
1809
1810 // Unlock
1811 Label unlock_done;
1812 Label slow_path_unlock;
1813 if (method->is_synchronized()) {
1814
1815 // Get locked oop from the handle we passed to jni
1816 __ ld(obj_reg, Address(oop_handle_reg, 0));
1817
1818 Label done, not_recursive;
1819
1820 if (LockingMode == LM_LEGACY) {
1821 // Simple recursive lock?
1822 __ ld(t0, Address(sp, lock_slot_offset * VMRegImpl::stack_slot_size));
1823 __ bnez(t0, not_recursive);
1824 __ decrement(Address(xthread, JavaThread::held_monitor_count_offset()));
1825 __ j(done);
1826 }
1827
1828 __ bind(not_recursive);
1829
1830 // Must save x10 if if it is live now because cmpxchg must use it
1831 if (ret_type != T_FLOAT && ret_type != T_DOUBLE && ret_type != T_VOID) {
1832 save_native_result(masm, ret_type, stack_slots);
1833 }
1834
1835 if (LockingMode == LM_MONITOR) {
1836 __ j(slow_path_unlock);
1837 } else if (LockingMode == LM_LEGACY) {
1838 // get address of the stack lock
1839 __ la(x10, Address(sp, lock_slot_offset * VMRegImpl::stack_slot_size));
1840 // get old displaced header
1841 __ ld(old_hdr, Address(x10, 0));
1842
1843 // Atomic swap old header if oop still contains the stack lock
1844 Label count;
1845 __ cmpxchg_obj_header(x10, old_hdr, obj_reg, lock_tmp, count, &slow_path_unlock);
1846 __ bind(count);
1847 __ decrement(Address(xthread, JavaThread::held_monitor_count_offset()));
1848 } else {
1849 assert(LockingMode == LM_LIGHTWEIGHT, "");
1850 __ lightweight_unlock(obj_reg, old_hdr, swap_reg, lock_tmp, slow_path_unlock);
1851 __ decrement(Address(xthread, JavaThread::held_monitor_count_offset()));
1852 }
1853
1854 // slow path re-enters here
1855 __ bind(unlock_done);
1856 if (ret_type != T_FLOAT && ret_type != T_DOUBLE && ret_type != T_VOID) {
1857 restore_native_result(masm, ret_type, stack_slots);
1858 }
1859
1860 __ bind(done);
1861 }
1862
1863 Label dtrace_method_exit, dtrace_method_exit_done;
1864 {
1865 ExternalAddress target((address)&DTraceMethodProbes);
1866 __ relocate(target.rspec(), [&] {
1867 int32_t offset;
1868 __ la(t0, target.target(), offset);
1869 __ lbu(t0, Address(t0, offset));
1870 });
1871 __ bnez(t0, dtrace_method_exit);
1872 __ bind(dtrace_method_exit_done);
1873 }
1874
1875 __ reset_last_Java_frame(false);
1876
1877 // Unbox oop result, e.g. JNIHandles::resolve result.
1878 if (is_reference_type(ret_type)) {
1879 __ resolve_jobject(x10, x11, x12);
1880 }
1881
1882 if (CheckJNICalls) {
1883 // clear_pending_jni_exception_check
1884 __ sd(zr, Address(xthread, JavaThread::pending_jni_exception_check_fn_offset()));
1885 }
1886
1887 // reset handle block
1888 __ ld(x12, Address(xthread, JavaThread::active_handles_offset()));
1889 __ sd(zr, Address(x12, JNIHandleBlock::top_offset()));
1890
1891 __ leave();
1892
1893 // Any exception pending?
1894 Label exception_pending;
1895 __ ld(t0, Address(xthread, in_bytes(Thread::pending_exception_offset())));
1896 __ bnez(t0, exception_pending);
1897
1898 // We're done
1899 __ ret();
1900
1901 // Unexpected paths are out of line and go here
1902
1903 // forward the exception
1904 __ bind(exception_pending);
1905
1906 // and forward the exception
1907 __ far_jump(RuntimeAddress(StubRoutines::forward_exception_entry()));
1908
1909 // Slow path locking & unlocking
1910 if (method->is_synchronized()) {
1911
1912 __ block_comment("Slow path lock {");
1913 __ bind(slow_path_lock);
1914
1915 // has last_Java_frame setup. No exceptions so do vanilla call not call_VM
1916 // args are (oop obj, BasicLock* lock, JavaThread* thread)
1917
1918 // protect the args we've loaded
1919 save_args(masm, total_c_args, c_arg, out_regs);
1920
1921 __ mv(c_rarg0, obj_reg);
1922 __ mv(c_rarg1, lock_reg);
1923 __ mv(c_rarg2, xthread);
1924
1925 // Not a leaf but we have last_Java_frame setup as we want
1926 __ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::complete_monitor_locking_C), 3);
1927 restore_args(masm, total_c_args, c_arg, out_regs);
1928
1929 #ifdef ASSERT
1930 { Label L;
1931 __ ld(t0, Address(xthread, in_bytes(Thread::pending_exception_offset())));
1932 __ beqz(t0, L);
1933 __ stop("no pending exception allowed on exit from monitorenter");
1934 __ bind(L);
1935 }
1936 #endif
1937 __ j(lock_done);
1938
1939 __ block_comment("} Slow path lock");
1940
1941 __ block_comment("Slow path unlock {");
1942 __ bind(slow_path_unlock);
1943
1944 if (ret_type == T_FLOAT || ret_type == T_DOUBLE) {
1945 save_native_result(masm, ret_type, stack_slots);
1946 }
1947
1948 __ mv(c_rarg2, xthread);
1949 __ la(c_rarg1, Address(sp, lock_slot_offset * VMRegImpl::stack_slot_size));
1950 __ mv(c_rarg0, obj_reg);
1951
1952 // Save pending exception around call to VM (which contains an EXCEPTION_MARK)
1953 // NOTE that obj_reg == x9 currently
1954 __ ld(x9, Address(xthread, in_bytes(Thread::pending_exception_offset())));
1955 __ sd(zr, Address(xthread, in_bytes(Thread::pending_exception_offset())));
1956
1957 __ rt_call(CAST_FROM_FN_PTR(address, SharedRuntime::complete_monitor_unlocking_C));
1958
1959 #ifdef ASSERT
1960 {
1961 Label L;
1962 __ ld(t0, Address(xthread, in_bytes(Thread::pending_exception_offset())));
1963 __ beqz(t0, L);
1964 __ stop("no pending exception allowed on exit complete_monitor_unlocking_C");
1965 __ bind(L);
1966 }
1967 #endif /* ASSERT */
1968
1969 __ sd(x9, Address(xthread, in_bytes(Thread::pending_exception_offset())));
1970
1971 if (ret_type == T_FLOAT || ret_type == T_DOUBLE) {
1972 restore_native_result(masm, ret_type, stack_slots);
1973 }
1974 __ j(unlock_done);
1975
1976 __ block_comment("} Slow path unlock");
1977
1978 } // synchronized
1979
1980 // SLOW PATH Reguard the stack if needed
1981
1982 __ bind(reguard);
1983 save_native_result(masm, ret_type, stack_slots);
1984 __ rt_call(CAST_FROM_FN_PTR(address, SharedRuntime::reguard_yellow_pages));
1985 restore_native_result(masm, ret_type, stack_slots);
1986 // and continue
1987 __ j(reguard_done);
1988
1989 // SLOW PATH safepoint
1990 {
1991 __ block_comment("safepoint {");
1992 __ bind(safepoint_in_progress);
1993
1994 // Don't use call_VM as it will see a possible pending exception and forward it
1995 // and never return here preventing us from clearing _last_native_pc down below.
1996 //
1997 save_native_result(masm, ret_type, stack_slots);
1998 __ mv(c_rarg0, xthread);
1999 #ifndef PRODUCT
2000 assert(frame::arg_reg_save_area_bytes == 0, "not expecting frame reg save area");
2001 #endif
2002 __ rt_call(CAST_FROM_FN_PTR(address, JavaThread::check_special_condition_for_native_trans));
2003
2004 // Restore any method result value
2005 restore_native_result(masm, ret_type, stack_slots);
2006
2007 __ j(safepoint_in_progress_done);
2008 __ block_comment("} safepoint");
2009 }
2010
2011 // SLOW PATH dtrace support
2012 {
2013 __ block_comment("dtrace entry {");
2014 __ bind(dtrace_method_entry);
2015
2016 // We have all of the arguments setup at this point. We must not touch any register
2017 // argument registers at this point (what if we save/restore them there are no oop?
2018
2019 save_args(masm, total_c_args, c_arg, out_regs);
2020 __ mov_metadata(c_rarg1, method());
2021 __ call_VM_leaf(
2022 CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_entry),
2023 xthread, c_rarg1);
2024 restore_args(masm, total_c_args, c_arg, out_regs);
2025 __ j(dtrace_method_entry_done);
2026 __ block_comment("} dtrace entry");
2027 }
2028
2029 {
2030 __ block_comment("dtrace exit {");
2031 __ bind(dtrace_method_exit);
2032 save_native_result(masm, ret_type, stack_slots);
2033 __ mov_metadata(c_rarg1, method());
2034 __ call_VM_leaf(
2035 CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_exit),
2036 xthread, c_rarg1);
2037 restore_native_result(masm, ret_type, stack_slots);
2038 __ j(dtrace_method_exit_done);
2039 __ block_comment("} dtrace exit");
2040 }
2041
2042 __ flush();
2043
2044 nmethod *nm = nmethod::new_native_nmethod(method,
2045 compile_id,
2046 masm->code(),
2047 vep_offset,
2048 frame_complete,
2049 stack_slots / VMRegImpl::slots_per_word,
2050 (is_static ? in_ByteSize(klass_offset) : in_ByteSize(receiver_offset)),
2051 in_ByteSize(lock_slot_offset*VMRegImpl::stack_slot_size),
2052 oop_maps);
2053 assert(nm != nullptr, "create native nmethod fail!");
2054 return nm;
2055 }
2056
2057 // this function returns the adjust size (in number of words) to a c2i adapter
2058 // activation for use during deoptimization
2059 int Deoptimization::last_frame_adjust(int callee_parameters, int callee_locals) {
2060 assert(callee_locals >= callee_parameters,
2061 "test and remove; got more parms than locals");
2062 if (callee_locals < callee_parameters) {
2063 return 0; // No adjustment for negative locals
2064 }
2065 int diff = (callee_locals - callee_parameters) * Interpreter::stackElementWords;
2066 // diff is counted in stack words
2067 return align_up(diff, 2);
2068 }
2069
2070 //------------------------------generate_deopt_blob----------------------------
2071 void SharedRuntime::generate_deopt_blob() {
2072 // Allocate space for the code
2073 ResourceMark rm;
2074 // Setup code generation tools
2075 int pad = 0;
2076 #if INCLUDE_JVMCI
2077 if (EnableJVMCI) {
2078 pad += 512; // Increase the buffer size when compiling for JVMCI
2079 }
2080 #endif
2081 CodeBuffer buffer("deopt_blob", 2048 + pad, 1024);
2082 MacroAssembler* masm = new MacroAssembler(&buffer);
2083 int frame_size_in_words = -1;
2084 OopMap* map = nullptr;
2085 OopMapSet *oop_maps = new OopMapSet();
2086 assert_cond(masm != nullptr && oop_maps != nullptr);
2087 RegisterSaver reg_saver(COMPILER2_OR_JVMCI != 0);
2088
2089 // -------------
2090 // This code enters when returning to a de-optimized nmethod. A return
2091 // address has been pushed on the stack, and return values are in
2092 // registers.
2093 // If we are doing a normal deopt then we were called from the patched
2094 // nmethod from the point we returned to the nmethod. So the return
2095 // address on the stack is wrong by NativeCall::instruction_size
2096 // We will adjust the value so it looks like we have the original return
2097 // address on the stack (like when we eagerly deoptimized).
2098 // In the case of an exception pending when deoptimizing, we enter
2099 // with a return address on the stack that points after the call we patched
2100 // into the exception handler. We have the following register state from,
2101 // e.g., the forward exception stub (see stubGenerator_riscv.cpp).
2102 // x10: exception oop
2103 // x9: exception handler
2104 // x13: throwing pc
2105 // So in this case we simply jam x13 into the useless return address and
2106 // the stack looks just like we want.
2107 //
2108 // At this point we need to de-opt. We save the argument return
2109 // registers. We call the first C routine, fetch_unroll_info(). This
2110 // routine captures the return values and returns a structure which
2111 // describes the current frame size and the sizes of all replacement frames.
2112 // The current frame is compiled code and may contain many inlined
2113 // functions, each with their own JVM state. We pop the current frame, then
2114 // push all the new frames. Then we call the C routine unpack_frames() to
2115 // populate these frames. Finally unpack_frames() returns us the new target
2116 // address. Notice that callee-save registers are BLOWN here; they have
2117 // already been captured in the vframeArray at the time the return PC was
2118 // patched.
2119 address start = __ pc();
2120 Label cont;
2121
2122 // Prolog for non exception case!
2123
2124 // Save everything in sight.
2125 map = reg_saver.save_live_registers(masm, 0, &frame_size_in_words);
2126
2127 // Normal deoptimization. Save exec mode for unpack_frames.
2128 __ mv(xcpool, Deoptimization::Unpack_deopt); // callee-saved
2129 __ j(cont);
2130
2131 int reexecute_offset = __ pc() - start;
2132 #if INCLUDE_JVMCI && !defined(COMPILER1)
2133 if (EnableJVMCI && UseJVMCICompiler) {
2134 // JVMCI does not use this kind of deoptimization
2135 __ should_not_reach_here();
2136 }
2137 #endif
2138
2139 // Reexecute case
2140 // return address is the pc describes what bci to do re-execute at
2141
2142 // No need to update map as each call to save_live_registers will produce identical oopmap
2143 (void) reg_saver.save_live_registers(masm, 0, &frame_size_in_words);
2144
2145 __ mv(xcpool, Deoptimization::Unpack_reexecute); // callee-saved
2146 __ j(cont);
2147
2148 #if INCLUDE_JVMCI
2149 Label after_fetch_unroll_info_call;
2150 int implicit_exception_uncommon_trap_offset = 0;
2151 int uncommon_trap_offset = 0;
2152
2153 if (EnableJVMCI) {
2154 implicit_exception_uncommon_trap_offset = __ pc() - start;
2155
2156 __ ld(ra, Address(xthread, in_bytes(JavaThread::jvmci_implicit_exception_pc_offset())));
2157 __ sd(zr, Address(xthread, in_bytes(JavaThread::jvmci_implicit_exception_pc_offset())));
2158
2159 uncommon_trap_offset = __ pc() - start;
2160
2161 // Save everything in sight.
2162 reg_saver.save_live_registers(masm, 0, &frame_size_in_words);
2163 // fetch_unroll_info needs to call last_java_frame()
2164 Label retaddr;
2165 __ set_last_Java_frame(sp, noreg, retaddr, t0);
2166
2167 __ lw(c_rarg1, Address(xthread, in_bytes(JavaThread::pending_deoptimization_offset())));
2168 __ mv(t0, -1);
2169 __ sw(t0, Address(xthread, in_bytes(JavaThread::pending_deoptimization_offset())));
2170
2171 __ mv(xcpool, Deoptimization::Unpack_reexecute);
2172 __ mv(c_rarg0, xthread);
2173 __ orrw(c_rarg2, zr, xcpool); // exec mode
2174 __ rt_call(CAST_FROM_FN_PTR(address, Deoptimization::uncommon_trap));
2175 __ bind(retaddr);
2176 oop_maps->add_gc_map( __ pc()-start, map->deep_copy());
2177
2178 __ reset_last_Java_frame(false);
2179
2180 __ j(after_fetch_unroll_info_call);
2181 } // EnableJVMCI
2182 #endif // INCLUDE_JVMCI
2183
2184 int exception_offset = __ pc() - start;
2185
2186 // Prolog for exception case
2187
2188 // all registers are dead at this entry point, except for x10, and
2189 // x13 which contain the exception oop and exception pc
2190 // respectively. Set them in TLS and fall thru to the
2191 // unpack_with_exception_in_tls entry point.
2192
2193 __ sd(x13, Address(xthread, JavaThread::exception_pc_offset()));
2194 __ sd(x10, Address(xthread, JavaThread::exception_oop_offset()));
2195
2196 int exception_in_tls_offset = __ pc() - start;
2197
2198 // new implementation because exception oop is now passed in JavaThread
2199
2200 // Prolog for exception case
2201 // All registers must be preserved because they might be used by LinearScan
2202 // Exceptiop oop and throwing PC are passed in JavaThread
2203 // tos: stack at point of call to method that threw the exception (i.e. only
2204 // args are on the stack, no return address)
2205
2206 // The return address pushed by save_live_registers will be patched
2207 // later with the throwing pc. The correct value is not available
2208 // now because loading it from memory would destroy registers.
2209
2210 // NB: The SP at this point must be the SP of the method that is
2211 // being deoptimized. Deoptimization assumes that the frame created
2212 // here by save_live_registers is immediately below the method's SP.
2213 // This is a somewhat fragile mechanism.
2214
2215 // Save everything in sight.
2216 map = reg_saver.save_live_registers(masm, 0, &frame_size_in_words);
2217
2218 // Now it is safe to overwrite any register
2219
2220 // Deopt during an exception. Save exec mode for unpack_frames.
2221 __ mv(xcpool, Deoptimization::Unpack_exception); // callee-saved
2222
2223 // load throwing pc from JavaThread and patch it as the return address
2224 // of the current frame. Then clear the field in JavaThread
2225
2226 __ ld(x13, Address(xthread, JavaThread::exception_pc_offset()));
2227 __ sd(x13, Address(fp, frame::return_addr_offset * wordSize));
2228 __ sd(zr, Address(xthread, JavaThread::exception_pc_offset()));
2229
2230 #ifdef ASSERT
2231 // verify that there is really an exception oop in JavaThread
2232 __ ld(x10, Address(xthread, JavaThread::exception_oop_offset()));
2233 __ verify_oop(x10);
2234
2235 // verify that there is no pending exception
2236 Label no_pending_exception;
2237 __ ld(t0, Address(xthread, Thread::pending_exception_offset()));
2238 __ beqz(t0, no_pending_exception);
2239 __ stop("must not have pending exception here");
2240 __ bind(no_pending_exception);
2241 #endif
2242
2243 __ bind(cont);
2244
2245 // Call C code. Need thread and this frame, but NOT official VM entry
2246 // crud. We cannot block on this call, no GC can happen.
2247 //
2248 // UnrollBlock* fetch_unroll_info(JavaThread* thread)
2249
2250 // fetch_unroll_info needs to call last_java_frame().
2251
2252 Label retaddr;
2253 __ set_last_Java_frame(sp, noreg, retaddr, t0);
2254 #ifdef ASSERT
2255 {
2256 Label L;
2257 __ ld(t0, Address(xthread,
2258 JavaThread::last_Java_fp_offset()));
2259 __ beqz(t0, L);
2260 __ stop("SharedRuntime::generate_deopt_blob: last_Java_fp not cleared");
2261 __ bind(L);
2262 }
2263 #endif // ASSERT
2264 __ mv(c_rarg0, xthread);
2265 __ mv(c_rarg1, xcpool);
2266 __ rt_call(CAST_FROM_FN_PTR(address, Deoptimization::fetch_unroll_info));
2267 __ bind(retaddr);
2268
2269 // Need to have an oopmap that tells fetch_unroll_info where to
2270 // find any register it might need.
2271 oop_maps->add_gc_map(__ pc() - start, map);
2272
2273 __ reset_last_Java_frame(false);
2274
2275 #if INCLUDE_JVMCI
2276 if (EnableJVMCI) {
2277 __ bind(after_fetch_unroll_info_call);
2278 }
2279 #endif
2280
2281 // Load UnrollBlock* into x15
2282 __ mv(x15, x10);
2283
2284 __ lwu(xcpool, Address(x15, Deoptimization::UnrollBlock::unpack_kind_offset()));
2285 Label noException;
2286 __ mv(t0, Deoptimization::Unpack_exception);
2287 __ bne(xcpool, t0, noException); // Was exception pending?
2288 __ ld(x10, Address(xthread, JavaThread::exception_oop_offset()));
2289 __ ld(x13, Address(xthread, JavaThread::exception_pc_offset()));
2290 __ sd(zr, Address(xthread, JavaThread::exception_oop_offset()));
2291 __ sd(zr, Address(xthread, JavaThread::exception_pc_offset()));
2292
2293 __ verify_oop(x10);
2294
2295 // Overwrite the result registers with the exception results.
2296 __ sd(x10, Address(sp, reg_saver.reg_offset_in_bytes(x10)));
2297
2298 __ bind(noException);
2299
2300 // Only register save data is on the stack.
2301 // Now restore the result registers. Everything else is either dead
2302 // or captured in the vframeArray.
2303
2304 // Restore fp result register
2305 __ fld(f10, Address(sp, reg_saver.freg_offset_in_bytes(f10)));
2306 // Restore integer result register
2307 __ ld(x10, Address(sp, reg_saver.reg_offset_in_bytes(x10)));
2308
2309 // Pop all of the register save area off the stack
2310 __ add(sp, sp, frame_size_in_words * wordSize);
2311
2312 // All of the register save area has been popped of the stack. Only the
2313 // return address remains.
2314
2315 // Pop all the frames we must move/replace.
2316 //
2317 // Frame picture (youngest to oldest)
2318 // 1: self-frame (no frame link)
2319 // 2: deopting frame (no frame link)
2320 // 3: caller of deopting frame (could be compiled/interpreted).
2321 //
2322 // Note: by leaving the return address of self-frame on the stack
2323 // and using the size of frame 2 to adjust the stack
2324 // when we are done the return to frame 3 will still be on the stack.
2325
2326 // Pop deoptimized frame
2327 __ lwu(x12, Address(x15, Deoptimization::UnrollBlock::size_of_deoptimized_frame_offset()));
2328 __ sub(x12, x12, 2 * wordSize);
2329 __ add(sp, sp, x12);
2330 __ ld(fp, Address(sp, 0));
2331 __ ld(ra, Address(sp, wordSize));
2332 __ addi(sp, sp, 2 * wordSize);
2333 // RA should now be the return address to the caller (3)
2334
2335 #ifdef ASSERT
2336 // Compilers generate code that bang the stack by as much as the
2337 // interpreter would need. So this stack banging should never
2338 // trigger a fault. Verify that it does not on non product builds.
2339 __ lwu(x9, Address(x15, Deoptimization::UnrollBlock::total_frame_sizes_offset()));
2340 __ bang_stack_size(x9, x12);
2341 #endif
2342 // Load address of array of frame pcs into x12
2343 __ ld(x12, Address(x15, Deoptimization::UnrollBlock::frame_pcs_offset()));
2344
2345 // Load address of array of frame sizes into x14
2346 __ ld(x14, Address(x15, Deoptimization::UnrollBlock::frame_sizes_offset()));
2347
2348 // Load counter into x13
2349 __ lwu(x13, Address(x15, Deoptimization::UnrollBlock::number_of_frames_offset()));
2350
2351 // Now adjust the caller's stack to make up for the extra locals
2352 // but record the original sp so that we can save it in the skeletal interpreter
2353 // frame and the stack walking of interpreter_sender will get the unextended sp
2354 // value and not the "real" sp value.
2355
2356 const Register sender_sp = x16;
2357
2358 __ mv(sender_sp, sp);
2359 __ lwu(x9, Address(x15,
2360 Deoptimization::UnrollBlock::
2361 caller_adjustment_offset()));
2362 __ sub(sp, sp, x9);
2363
2364 // Push interpreter frames in a loop
2365 __ mv(t0, 0xDEADDEAD); // Make a recognizable pattern
2366 __ mv(t1, t0);
2367 Label loop;
2368 __ bind(loop);
2369 __ ld(x9, Address(x14, 0)); // Load frame size
2370 __ addi(x14, x14, wordSize);
2371 __ sub(x9, x9, 2 * wordSize); // We'll push pc and fp by hand
2372 __ ld(ra, Address(x12, 0)); // Load pc
2373 __ addi(x12, x12, wordSize);
2374 __ enter(); // Save old & set new fp
2375 __ sub(sp, sp, x9); // Prolog
2376 // This value is corrected by layout_activation_impl
2377 __ sd(zr, Address(fp, frame::interpreter_frame_last_sp_offset * wordSize));
2378 __ sd(sender_sp, Address(fp, frame::interpreter_frame_sender_sp_offset * wordSize)); // Make it walkable
2379 __ mv(sender_sp, sp); // Pass sender_sp to next frame
2380 __ addi(x13, x13, -1); // Decrement counter
2381 __ bnez(x13, loop);
2382
2383 // Re-push self-frame
2384 __ ld(ra, Address(x12));
2385 __ enter();
2386
2387 // Allocate a full sized register save area. We subtract 2 because
2388 // enter() just pushed 2 words
2389 __ sub(sp, sp, (frame_size_in_words - 2) * wordSize);
2390
2391 // Restore frame locals after moving the frame
2392 __ fsd(f10, Address(sp, reg_saver.freg_offset_in_bytes(f10)));
2393 __ sd(x10, Address(sp, reg_saver.reg_offset_in_bytes(x10)));
2394
2395 // Call C code. Need thread but NOT official VM entry
2396 // crud. We cannot block on this call, no GC can happen. Call should
2397 // restore return values to their stack-slots with the new SP.
2398 //
2399 // void Deoptimization::unpack_frames(JavaThread* thread, int exec_mode)
2400
2401 // Use fp because the frames look interpreted now
2402 // Don't need the precise return PC here, just precise enough to point into this code blob.
2403 address the_pc = __ pc();
2404 __ set_last_Java_frame(sp, fp, the_pc, t0);
2405
2406 __ mv(c_rarg0, xthread);
2407 __ mv(c_rarg1, xcpool); // second arg: exec_mode
2408 __ rt_call(CAST_FROM_FN_PTR(address, Deoptimization::unpack_frames));
2409
2410 // Set an oopmap for the call site
2411 // Use the same PC we used for the last java frame
2412 oop_maps->add_gc_map(the_pc - start,
2413 new OopMap(frame_size_in_words, 0));
2414
2415 // Clear fp AND pc
2416 __ reset_last_Java_frame(true);
2417
2418 // Collect return values
2419 __ fld(f10, Address(sp, reg_saver.freg_offset_in_bytes(f10)));
2420 __ ld(x10, Address(sp, reg_saver.reg_offset_in_bytes(x10)));
2421
2422 // Pop self-frame.
2423 __ leave(); // Epilog
2424
2425 // Jump to interpreter
2426 __ ret();
2427
2428 // Make sure all code is generated
2429 masm->flush();
2430
2431 _deopt_blob = DeoptimizationBlob::create(&buffer, oop_maps, 0, exception_offset, reexecute_offset, frame_size_in_words);
2432 assert(_deopt_blob != nullptr, "create deoptimization blob fail!");
2433 _deopt_blob->set_unpack_with_exception_in_tls_offset(exception_in_tls_offset);
2434 #if INCLUDE_JVMCI
2435 if (EnableJVMCI) {
2436 _deopt_blob->set_uncommon_trap_offset(uncommon_trap_offset);
2437 _deopt_blob->set_implicit_exception_uncommon_trap_offset(implicit_exception_uncommon_trap_offset);
2438 }
2439 #endif
2440 }
2441
2442 // Number of stack slots between incoming argument block and the start of
2443 // a new frame. The PROLOG must add this many slots to the stack. The
2444 // EPILOG must remove this many slots.
2445 // RISCV needs two words for RA (return address) and FP (frame pointer).
2446 uint SharedRuntime::in_preserve_stack_slots() {
2447 return 2 * VMRegImpl::slots_per_word;
2448 }
2449
2450 uint SharedRuntime::out_preserve_stack_slots() {
2451 return 0;
2452 }
2453
2454 #ifdef COMPILER2
2455 //------------------------------generate_uncommon_trap_blob--------------------
2456 void SharedRuntime::generate_uncommon_trap_blob() {
2457 // Allocate space for the code
2458 ResourceMark rm;
2459 // Setup code generation tools
2460 CodeBuffer buffer("uncommon_trap_blob", 2048, 1024);
2461 MacroAssembler* masm = new MacroAssembler(&buffer);
2462 assert_cond(masm != nullptr);
2463
2464 assert(SimpleRuntimeFrame::framesize % 4 == 0, "sp not 16-byte aligned");
2465
2466 address start = __ pc();
2467
2468 // Push self-frame. We get here with a return address in RA
2469 // and sp should be 16 byte aligned
2470 // push fp and retaddr by hand
2471 __ addi(sp, sp, -2 * wordSize);
2472 __ sd(ra, Address(sp, wordSize));
2473 __ sd(fp, Address(sp, 0));
2474 // we don't expect an arg reg save area
2475 #ifndef PRODUCT
2476 assert(frame::arg_reg_save_area_bytes == 0, "not expecting frame reg save area");
2477 #endif
2478 // compiler left unloaded_class_index in j_rarg0 move to where the
2479 // runtime expects it.
2480 __ sign_extend(c_rarg1, j_rarg0, 32);
2481
2482 // we need to set the past SP to the stack pointer of the stub frame
2483 // and the pc to the address where this runtime call will return
2484 // although actually any pc in this code blob will do).
2485 Label retaddr;
2486 __ set_last_Java_frame(sp, noreg, retaddr, t0);
2487
2488 // Call C code. Need thread but NOT official VM entry
2489 // crud. We cannot block on this call, no GC can happen. Call should
2490 // capture callee-saved registers as well as return values.
2491 //
2492 // UnrollBlock* uncommon_trap(JavaThread* thread, jint unloaded_class_index, jint exec_mode)
2493 //
2494 // n.b. 3 gp args, 0 fp args, integral return type
2495
2496 __ mv(c_rarg0, xthread);
2497 __ mv(c_rarg2, Deoptimization::Unpack_uncommon_trap);
2498 __ rt_call(CAST_FROM_FN_PTR(address, Deoptimization::uncommon_trap));
2499 __ bind(retaddr);
2500
2501 // Set an oopmap for the call site
2502 OopMapSet* oop_maps = new OopMapSet();
2503 OopMap* map = new OopMap(SimpleRuntimeFrame::framesize, 0);
2504 assert_cond(oop_maps != nullptr && map != nullptr);
2505
2506 // location of fp is known implicitly by the frame sender code
2507
2508 oop_maps->add_gc_map(__ pc() - start, map);
2509
2510 __ reset_last_Java_frame(false);
2511
2512 // move UnrollBlock* into x14
2513 __ mv(x14, x10);
2514
2515 #ifdef ASSERT
2516 { Label L;
2517 __ lwu(t0, Address(x14, Deoptimization::UnrollBlock::unpack_kind_offset()));
2518 __ mv(t1, Deoptimization::Unpack_uncommon_trap);
2519 __ beq(t0, t1, L);
2520 __ stop("SharedRuntime::generate_uncommon_trap_blob: expected Unpack_uncommon_trap");
2521 __ bind(L);
2522 }
2523 #endif
2524
2525 // Pop all the frames we must move/replace.
2526 //
2527 // Frame picture (youngest to oldest)
2528 // 1: self-frame (no frame link)
2529 // 2: deopting frame (no frame link)
2530 // 3: caller of deopting frame (could be compiled/interpreted).
2531
2532 __ add(sp, sp, (SimpleRuntimeFrame::framesize) << LogBytesPerInt); // Epilog!
2533
2534 // Pop deoptimized frame (int)
2535 __ lwu(x12, Address(x14,
2536 Deoptimization::UnrollBlock::
2537 size_of_deoptimized_frame_offset()));
2538 __ sub(x12, x12, 2 * wordSize);
2539 __ add(sp, sp, x12);
2540 __ ld(fp, Address(sp, 0));
2541 __ ld(ra, Address(sp, wordSize));
2542 __ addi(sp, sp, 2 * wordSize);
2543 // RA should now be the return address to the caller (3) frame
2544
2545 #ifdef ASSERT
2546 // Compilers generate code that bang the stack by as much as the
2547 // interpreter would need. So this stack banging should never
2548 // trigger a fault. Verify that it does not on non product builds.
2549 __ lwu(x11, Address(x14,
2550 Deoptimization::UnrollBlock::
2551 total_frame_sizes_offset()));
2552 __ bang_stack_size(x11, x12);
2553 #endif
2554
2555 // Load address of array of frame pcs into x12 (address*)
2556 __ ld(x12, Address(x14,
2557 Deoptimization::UnrollBlock::frame_pcs_offset()));
2558
2559 // Load address of array of frame sizes into x15 (intptr_t*)
2560 __ ld(x15, Address(x14,
2561 Deoptimization::UnrollBlock::
2562 frame_sizes_offset()));
2563
2564 // Counter
2565 __ lwu(x13, Address(x14,
2566 Deoptimization::UnrollBlock::
2567 number_of_frames_offset())); // (int)
2568
2569 // Now adjust the caller's stack to make up for the extra locals but
2570 // record the original sp so that we can save it in the skeletal
2571 // interpreter frame and the stack walking of interpreter_sender
2572 // will get the unextended sp value and not the "real" sp value.
2573
2574 const Register sender_sp = t1; // temporary register
2575
2576 __ lwu(x11, Address(x14,
2577 Deoptimization::UnrollBlock::
2578 caller_adjustment_offset())); // (int)
2579 __ mv(sender_sp, sp);
2580 __ sub(sp, sp, x11);
2581
2582 // Push interpreter frames in a loop
2583 Label loop;
2584 __ bind(loop);
2585 __ ld(x11, Address(x15, 0)); // Load frame size
2586 __ sub(x11, x11, 2 * wordSize); // We'll push pc and fp by hand
2587 __ ld(ra, Address(x12, 0)); // Save return address
2588 __ enter(); // and old fp & set new fp
2589 __ sub(sp, sp, x11); // Prolog
2590 __ sd(sender_sp, Address(fp, frame::interpreter_frame_sender_sp_offset * wordSize)); // Make it walkable
2591 // This value is corrected by layout_activation_impl
2592 __ sd(zr, Address(fp, frame::interpreter_frame_last_sp_offset * wordSize));
2593 __ mv(sender_sp, sp); // Pass sender_sp to next frame
2594 __ add(x15, x15, wordSize); // Bump array pointer (sizes)
2595 __ add(x12, x12, wordSize); // Bump array pointer (pcs)
2596 __ subw(x13, x13, 1); // Decrement counter
2597 __ bgtz(x13, loop);
2598 __ ld(ra, Address(x12, 0)); // save final return address
2599 // Re-push self-frame
2600 __ enter(); // & old fp & set new fp
2601
2602 // Use fp because the frames look interpreted now
2603 // Save "the_pc" since it cannot easily be retrieved using the last_java_SP after we aligned SP.
2604 // Don't need the precise return PC here, just precise enough to point into this code blob.
2605 address the_pc = __ pc();
2606 __ set_last_Java_frame(sp, fp, the_pc, t0);
2607
2608 // Call C code. Need thread but NOT official VM entry
2609 // crud. We cannot block on this call, no GC can happen. Call should
2610 // restore return values to their stack-slots with the new SP.
2611 //
2612 // BasicType unpack_frames(JavaThread* thread, int exec_mode)
2613 //
2614
2615 // n.b. 2 gp args, 0 fp args, integral return type
2616
2617 // sp should already be aligned
2618 __ mv(c_rarg0, xthread);
2619 __ mv(c_rarg1, Deoptimization::Unpack_uncommon_trap);
2620 __ rt_call(CAST_FROM_FN_PTR(address, Deoptimization::unpack_frames));
2621
2622 // Set an oopmap for the call site
2623 // Use the same PC we used for the last java frame
2624 oop_maps->add_gc_map(the_pc - start, new OopMap(SimpleRuntimeFrame::framesize, 0));
2625
2626 // Clear fp AND pc
2627 __ reset_last_Java_frame(true);
2628
2629 // Pop self-frame.
2630 __ leave(); // Epilog
2631
2632 // Jump to interpreter
2633 __ ret();
2634
2635 // Make sure all code is generated
2636 masm->flush();
2637
2638 _uncommon_trap_blob = UncommonTrapBlob::create(&buffer, oop_maps,
2639 SimpleRuntimeFrame::framesize >> 1);
2640 }
2641 #endif // COMPILER2
2642
2643 //------------------------------generate_handler_blob------
2644 //
2645 // Generate a special Compile2Runtime blob that saves all registers,
2646 // and setup oopmap.
2647 //
2648 SafepointBlob* SharedRuntime::generate_handler_blob(address call_ptr, int poll_type) {
2649 ResourceMark rm;
2650 OopMapSet *oop_maps = new OopMapSet();
2651 assert_cond(oop_maps != nullptr);
2652 OopMap* map = nullptr;
2653
2654 // Allocate space for the code. Setup code generation tools.
2655 CodeBuffer buffer("handler_blob", 2048, 1024);
2656 MacroAssembler* masm = new MacroAssembler(&buffer);
2657 assert_cond(masm != nullptr);
2658
2659 address start = __ pc();
2660 address call_pc = nullptr;
2661 int frame_size_in_words = -1;
2662 bool cause_return = (poll_type == POLL_AT_RETURN);
2663 RegisterSaver reg_saver(poll_type == POLL_AT_VECTOR_LOOP /* save_vectors */);
2664
2665 // Save Integer and Float registers.
2666 map = reg_saver.save_live_registers(masm, 0, &frame_size_in_words);
2667
2668 // The following is basically a call_VM. However, we need the precise
2669 // address of the call in order to generate an oopmap. Hence, we do all the
2670 // work ourselves.
2671
2672 Label retaddr;
2673 __ set_last_Java_frame(sp, noreg, retaddr, t0);
2674
2675 // The return address must always be correct so that frame constructor never
2676 // sees an invalid pc.
2677
2678 if (!cause_return) {
2679 // overwrite the return address pushed by save_live_registers
2680 // Additionally, x18 is a callee-saved register so we can look at
2681 // it later to determine if someone changed the return address for
2682 // us!
2683 __ ld(x18, Address(xthread, JavaThread::saved_exception_pc_offset()));
2684 __ sd(x18, Address(fp, frame::return_addr_offset * wordSize));
2685 }
2686
2687 // Do the call
2688 __ mv(c_rarg0, xthread);
2689 __ rt_call(call_ptr);
2690 __ bind(retaddr);
2691
2692 // Set an oopmap for the call site. This oopmap will map all
2693 // oop-registers and debug-info registers as callee-saved. This
2694 // will allow deoptimization at this safepoint to find all possible
2695 // debug-info recordings, as well as let GC find all oops.
2696
2697 oop_maps->add_gc_map( __ pc() - start, map);
2698
2699 Label noException;
2700
2701 __ reset_last_Java_frame(false);
2702
2703 __ membar(MacroAssembler::LoadLoad | MacroAssembler::LoadStore);
2704
2705 __ ld(t0, Address(xthread, Thread::pending_exception_offset()));
2706 __ beqz(t0, noException);
2707
2708 // Exception pending
2709
2710 reg_saver.restore_live_registers(masm);
2711
2712 __ far_jump(RuntimeAddress(StubRoutines::forward_exception_entry()));
2713
2714 // No exception case
2715 __ bind(noException);
2716
2717 Label no_adjust, bail;
2718 if (!cause_return) {
2719 // If our stashed return pc was modified by the runtime we avoid touching it
2720 __ ld(t0, Address(fp, frame::return_addr_offset * wordSize));
2721 __ bne(x18, t0, no_adjust);
2722
2723 #ifdef ASSERT
2724 // Verify the correct encoding of the poll we're about to skip.
2725 // See NativeInstruction::is_lwu_to_zr()
2726 __ lwu(t0, Address(x18));
2727 __ andi(t1, t0, 0b0000011);
2728 __ mv(t2, 0b0000011);
2729 __ bne(t1, t2, bail); // 0-6:0b0000011
2730 __ srli(t1, t0, 7);
2731 __ andi(t1, t1, 0b00000);
2732 __ bnez(t1, bail); // 7-11:0b00000
2733 __ srli(t1, t0, 12);
2734 __ andi(t1, t1, 0b110);
2735 __ mv(t2, 0b110);
2736 __ bne(t1, t2, bail); // 12-14:0b110
2737 #endif
2738 // Adjust return pc forward to step over the safepoint poll instruction
2739 __ add(x18, x18, NativeInstruction::instruction_size);
2740 __ sd(x18, Address(fp, frame::return_addr_offset * wordSize));
2741 }
2742
2743 __ bind(no_adjust);
2744 // Normal exit, restore registers and exit.
2745
2746 reg_saver.restore_live_registers(masm);
2747 __ ret();
2748
2749 #ifdef ASSERT
2750 __ bind(bail);
2751 __ stop("Attempting to adjust pc to skip safepoint poll but the return point is not what we expected");
2752 #endif
2753
2754 // Make sure all code is generated
2755 masm->flush();
2756
2757 // Fill-out other meta info
2758 return SafepointBlob::create(&buffer, oop_maps, frame_size_in_words);
2759 }
2760
2761 //
2762 // generate_resolve_blob - call resolution (static/virtual/opt-virtual/ic-miss
2763 //
2764 // Generate a stub that calls into vm to find out the proper destination
2765 // of a java call. All the argument registers are live at this point
2766 // but since this is generic code we don't know what they are and the caller
2767 // must do any gc of the args.
2768 //
2769 RuntimeStub* SharedRuntime::generate_resolve_blob(address destination, const char* name) {
2770 assert(StubRoutines::forward_exception_entry() != nullptr, "must be generated before");
2771
2772 // allocate space for the code
2773 ResourceMark rm;
2774
2775 CodeBuffer buffer(name, 1000, 512);
2776 MacroAssembler* masm = new MacroAssembler(&buffer);
2777 assert_cond(masm != nullptr);
2778
2779 int frame_size_in_words = -1;
2780 RegisterSaver reg_saver(false /* save_vectors */);
2781
2782 OopMapSet *oop_maps = new OopMapSet();
2783 assert_cond(oop_maps != nullptr);
2784 OopMap* map = nullptr;
2785
2786 int start = __ offset();
2787
2788 map = reg_saver.save_live_registers(masm, 0, &frame_size_in_words);
2789
2790 int frame_complete = __ offset();
2791
2792 {
2793 Label retaddr;
2794 __ set_last_Java_frame(sp, noreg, retaddr, t0);
2795
2796 __ mv(c_rarg0, xthread);
2797 __ rt_call(destination);
2798 __ bind(retaddr);
2799 }
2800
2801 // Set an oopmap for the call site.
2802 // We need this not only for callee-saved registers, but also for volatile
2803 // registers that the compiler might be keeping live across a safepoint.
2804
2805 oop_maps->add_gc_map( __ offset() - start, map);
2806
2807 // x10 contains the address we are going to jump to assuming no exception got installed
2808
2809 // clear last_Java_sp
2810 __ reset_last_Java_frame(false);
2811 // check for pending exceptions
2812 Label pending;
2813 __ ld(t0, Address(xthread, Thread::pending_exception_offset()));
2814 __ bnez(t0, pending);
2815
2816 // get the returned Method*
2817 __ get_vm_result_2(xmethod, xthread);
2818 __ sd(xmethod, Address(sp, reg_saver.reg_offset_in_bytes(xmethod)));
2819
2820 // x10 is where we want to jump, overwrite t0 which is saved and temporary
2821 __ sd(x10, Address(sp, reg_saver.reg_offset_in_bytes(t0)));
2822 reg_saver.restore_live_registers(masm);
2823
2824 // We are back to the original state on entry and ready to go.
2825
2826 __ jr(t0);
2827
2828 // Pending exception after the safepoint
2829
2830 __ bind(pending);
2831
2832 reg_saver.restore_live_registers(masm);
2833
2834 // exception pending => remove activation and forward to exception handler
2835
2836 __ sd(zr, Address(xthread, JavaThread::vm_result_offset()));
2837
2838 __ ld(x10, Address(xthread, Thread::pending_exception_offset()));
2839 __ far_jump(RuntimeAddress(StubRoutines::forward_exception_entry()));
2840
2841 // -------------
2842 // make sure all code is generated
2843 masm->flush();
2844
2845 // return the blob
2846 return RuntimeStub::new_runtime_stub(name, &buffer, frame_complete, frame_size_in_words, oop_maps, true);
2847 }
2848
2849 #ifdef COMPILER2
2850 //------------------------------generate_exception_blob---------------------------
2851 // creates exception blob at the end
2852 // Using exception blob, this code is jumped from a compiled method.
2853 // (see emit_exception_handler in riscv.ad file)
2854 //
2855 // Given an exception pc at a call we call into the runtime for the
2856 // handler in this method. This handler might merely restore state
2857 // (i.e. callee save registers) unwind the frame and jump to the
2858 // exception handler for the nmethod if there is no Java level handler
2859 // for the nmethod.
2860 //
2861 // This code is entered with a jmp.
2862 //
2863 // Arguments:
2864 // x10: exception oop
2865 // x13: exception pc
2866 //
2867 // Results:
2868 // x10: exception oop
2869 // x13: exception pc in caller
2870 // destination: exception handler of caller
2871 //
2872 // Note: the exception pc MUST be at a call (precise debug information)
2873 // Registers x10, x13, x12, x14, x15, t0 are not callee saved.
2874 //
2875
2876 void OptoRuntime::generate_exception_blob() {
2877 assert(!OptoRuntime::is_callee_saved_register(R13_num), "");
2878 assert(!OptoRuntime::is_callee_saved_register(R10_num), "");
2879 assert(!OptoRuntime::is_callee_saved_register(R12_num), "");
2880
2881 assert(SimpleRuntimeFrame::framesize % 4 == 0, "sp not 16-byte aligned");
2882
2883 // Allocate space for the code
2884 ResourceMark rm;
2885 // Setup code generation tools
2886 CodeBuffer buffer("exception_blob", 2048, 1024);
2887 MacroAssembler* masm = new MacroAssembler(&buffer);
2888 assert_cond(masm != nullptr);
2889
2890 // TODO check various assumptions made here
2891 //
2892 // make sure we do so before running this
2893
2894 address start = __ pc();
2895
2896 // push fp and retaddr by hand
2897 // Exception pc is 'return address' for stack walker
2898 __ addi(sp, sp, -2 * wordSize);
2899 __ sd(ra, Address(sp, wordSize));
2900 __ sd(fp, Address(sp));
2901 // there are no callee save registers and we don't expect an
2902 // arg reg save area
2903 #ifndef PRODUCT
2904 assert(frame::arg_reg_save_area_bytes == 0, "not expecting frame reg save area");
2905 #endif
2906 // Store exception in Thread object. We cannot pass any arguments to the
2907 // handle_exception call, since we do not want to make any assumption
2908 // about the size of the frame where the exception happened in.
2909 __ sd(x10, Address(xthread, JavaThread::exception_oop_offset()));
2910 __ sd(x13, Address(xthread, JavaThread::exception_pc_offset()));
2911
2912 // This call does all the hard work. It checks if an exception handler
2913 // exists in the method.
2914 // If so, it returns the handler address.
2915 // If not, it prepares for stack-unwinding, restoring the callee-save
2916 // registers of the frame being removed.
2917 //
2918 // address OptoRuntime::handle_exception_C(JavaThread* thread)
2919 //
2920 // n.b. 1 gp arg, 0 fp args, integral return type
2921
2922 // the stack should always be aligned
2923 address the_pc = __ pc();
2924 __ set_last_Java_frame(sp, noreg, the_pc, t0);
2925 __ mv(c_rarg0, xthread);
2926 __ rt_call(CAST_FROM_FN_PTR(address, OptoRuntime::handle_exception_C));
2927
2928 // handle_exception_C is a special VM call which does not require an explicit
2929 // instruction sync afterwards.
2930
2931 // Set an oopmap for the call site. This oopmap will only be used if we
2932 // are unwinding the stack. Hence, all locations will be dead.
2933 // Callee-saved registers will be the same as the frame above (i.e.,
2934 // handle_exception_stub), since they were restored when we got the
2935 // exception.
2936
2937 OopMapSet* oop_maps = new OopMapSet();
2938 assert_cond(oop_maps != nullptr);
2939
2940 oop_maps->add_gc_map(the_pc - start, new OopMap(SimpleRuntimeFrame::framesize, 0));
2941
2942 __ reset_last_Java_frame(false);
2943
2944 // Restore callee-saved registers
2945
2946 // fp is an implicitly saved callee saved register (i.e. the calling
2947 // convention will save restore it in prolog/epilog) Other than that
2948 // there are no callee save registers now that adapter frames are gone.
2949 // and we dont' expect an arg reg save area
2950 __ ld(fp, Address(sp));
2951 __ ld(x13, Address(sp, wordSize));
2952 __ addi(sp, sp , 2 * wordSize);
2953
2954 // x10: exception handler
2955
2956 // We have a handler in x10 (could be deopt blob).
2957 __ mv(t0, x10);
2958
2959 // Get the exception oop
2960 __ ld(x10, Address(xthread, JavaThread::exception_oop_offset()));
2961 // Get the exception pc in case we are deoptimized
2962 __ ld(x14, Address(xthread, JavaThread::exception_pc_offset()));
2963 #ifdef ASSERT
2964 __ sd(zr, Address(xthread, JavaThread::exception_handler_pc_offset()));
2965 __ sd(zr, Address(xthread, JavaThread::exception_pc_offset()));
2966 #endif
2967 // Clear the exception oop so GC no longer processes it as a root.
2968 __ sd(zr, Address(xthread, JavaThread::exception_oop_offset()));
2969
2970 // x10: exception oop
2971 // t0: exception handler
2972 // x14: exception pc
2973 // Jump to handler
2974
2975 __ jr(t0);
2976
2977 // Make sure all code is generated
2978 masm->flush();
2979
2980 // Set exception blob
2981 _exception_blob = ExceptionBlob::create(&buffer, oop_maps, SimpleRuntimeFrame::framesize >> 1);
2982 }
2983 #endif // COMPILER2