1 /*
2 * Copyright (c) 1999, 2023, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2014, 2021, Red Hat Inc. All rights reserved.
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This code is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 only, as
8 * published by the Free Software Foundation.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 *
24 */
25
26 #include "precompiled.hpp"
27 #include "asm/assembler.hpp"
28 #include "c1/c1_CodeStubs.hpp"
29 #include "c1/c1_Defs.hpp"
30 #include "c1/c1_MacroAssembler.hpp"
31 #include "c1/c1_Runtime1.hpp"
32 #include "compiler/disassembler.hpp"
33 #include "compiler/oopMap.hpp"
34 #include "gc/shared/cardTable.hpp"
35 #include "gc/shared/cardTableBarrierSet.hpp"
36 #include "gc/shared/collectedHeap.hpp"
37 #include "gc/shared/tlab_globals.hpp"
38 #include "interpreter/interpreter.hpp"
39 #include "memory/universe.hpp"
40 #include "nativeInst_aarch64.hpp"
41 #include "oops/oop.inline.hpp"
42 #include "prims/jvmtiExport.hpp"
43 #include "register_aarch64.hpp"
44 #include "runtime/sharedRuntime.hpp"
45 #include "runtime/signature.hpp"
46 #include "runtime/stubRoutines.hpp"
47 #include "runtime/vframe.hpp"
48 #include "runtime/vframeArray.hpp"
49 #include "utilities/powerOfTwo.hpp"
50 #include "vmreg_aarch64.inline.hpp"
51
52
53 // Implementation of StubAssembler
54
55 int StubAssembler::call_RT(Register oop_result1, Register metadata_result, address entry, int args_size) {
56 // setup registers
57 assert(!(oop_result1->is_valid() || metadata_result->is_valid()) || oop_result1 != metadata_result, "registers must be different");
58 assert(oop_result1 != rthread && metadata_result != rthread, "registers must be different");
59 assert(args_size >= 0, "illegal args_size");
60 bool align_stack = false;
61
62 mov(c_rarg0, rthread);
63 set_num_rt_args(0); // Nothing on stack
64
65 Label retaddr;
66 set_last_Java_frame(sp, rfp, retaddr, rscratch1);
67
68 // do the call
69 lea(rscratch1, RuntimeAddress(entry));
70 blr(rscratch1);
71 bind(retaddr);
72 int call_offset = offset();
73 // verify callee-saved register
74 #ifdef ASSERT
75 push(r0, sp);
76 { Label L;
77 get_thread(r0);
78 cmp(rthread, r0);
79 br(Assembler::EQ, L);
80 stop("StubAssembler::call_RT: rthread not callee saved?");
81 bind(L);
82 }
83 pop(r0, sp);
84 #endif
85 reset_last_Java_frame(true);
86
87 // check for pending exceptions
88 { Label L;
89 // check for pending exceptions (java_thread is set upon return)
90 ldr(rscratch1, Address(rthread, in_bytes(Thread::pending_exception_offset())));
91 cbz(rscratch1, L);
92 // exception pending => remove activation and forward to exception handler
93 // make sure that the vm_results are cleared
94 if (oop_result1->is_valid()) {
95 str(zr, Address(rthread, JavaThread::vm_result_offset()));
96 }
97 if (metadata_result->is_valid()) {
98 str(zr, Address(rthread, JavaThread::vm_result_2_offset()));
99 }
100 if (frame_size() == no_frame_size) {
101 leave();
102 far_jump(RuntimeAddress(StubRoutines::forward_exception_entry()));
103 } else if (_stub_id == Runtime1::forward_exception_id) {
104 should_not_reach_here();
105 } else {
106 far_jump(RuntimeAddress(Runtime1::entry_for(Runtime1::forward_exception_id)));
107 }
108 bind(L);
109 }
110 // get oop results if there are any and reset the values in the thread
111 if (oop_result1->is_valid()) {
112 get_vm_result(oop_result1, rthread);
113 }
114 if (metadata_result->is_valid()) {
115 get_vm_result_2(metadata_result, rthread);
116 }
117 return call_offset;
118 }
119
120
121 int StubAssembler::call_RT(Register oop_result1, Register metadata_result, address entry, Register arg1) {
122 mov(c_rarg1, arg1);
123 return call_RT(oop_result1, metadata_result, entry, 1);
124 }
125
126
127 int StubAssembler::call_RT(Register oop_result1, Register metadata_result, address entry, Register arg1, Register arg2) {
128 if (c_rarg1 == arg2) {
129 if (c_rarg2 == arg1) {
130 mov(rscratch1, arg1);
131 mov(arg1, arg2);
132 mov(arg2, rscratch1);
133 } else {
134 mov(c_rarg2, arg2);
135 mov(c_rarg1, arg1);
136 }
137 } else {
138 mov(c_rarg1, arg1);
139 mov(c_rarg2, arg2);
140 }
141 return call_RT(oop_result1, metadata_result, entry, 2);
142 }
143
144
145 int StubAssembler::call_RT(Register oop_result1, Register metadata_result, address entry, Register arg1, Register arg2, Register arg3) {
146 // if there is any conflict use the stack
147 if (arg1 == c_rarg2 || arg1 == c_rarg3 ||
148 arg2 == c_rarg1 || arg2 == c_rarg3 ||
149 arg3 == c_rarg1 || arg3 == c_rarg2) {
150 stp(arg3, arg2, Address(pre(sp, -2 * wordSize)));
151 stp(arg1, zr, Address(pre(sp, -2 * wordSize)));
152 ldp(c_rarg1, zr, Address(post(sp, 2 * wordSize)));
153 ldp(c_rarg3, c_rarg2, Address(post(sp, 2 * wordSize)));
154 } else {
155 mov(c_rarg1, arg1);
156 mov(c_rarg2, arg2);
157 mov(c_rarg3, arg3);
158 }
159 return call_RT(oop_result1, metadata_result, entry, 3);
160 }
161
162 enum return_state_t {
163 does_not_return, requires_return
164 };
165
166
167 // Implementation of StubFrame
168
169 class StubFrame: public StackObj {
170 private:
171 StubAssembler* _sasm;
172 bool _return_state;
173
174 public:
175 StubFrame(StubAssembler* sasm, const char* name, bool must_gc_arguments, return_state_t return_state=requires_return);
176 void load_argument(int offset_in_words, Register reg);
177
178 ~StubFrame();
179 };;
180
181 void StubAssembler::prologue(const char* name, bool must_gc_arguments) {
182 set_info(name, must_gc_arguments);
183 enter();
184 }
185
186 void StubAssembler::epilogue() {
187 leave();
188 ret(lr);
189 }
190
191 #define __ _sasm->
192
193 StubFrame::StubFrame(StubAssembler* sasm, const char* name, bool must_gc_arguments, return_state_t return_state) {
194 _sasm = sasm;
195 _return_state = return_state;
196 __ prologue(name, must_gc_arguments);
197 }
198
199 // load parameters that were stored with LIR_Assembler::store_parameter
200 // Note: offsets for store_parameter and load_argument must match
201 void StubFrame::load_argument(int offset_in_words, Register reg) {
202 __ load_parameter(offset_in_words, reg);
203 }
204
205 StubFrame::~StubFrame() {
206 if (_return_state == requires_return) {
207 __ epilogue();
208 } else {
209 __ should_not_reach_here();
210 }
211 }
212
213 #undef __
214
215
216 // Implementation of Runtime1
217
218 #define __ sasm->
219
220 const int float_regs_as_doubles_size_in_slots = pd_nof_fpu_regs_frame_map * 2;
221
222 // Stack layout for saving/restoring all the registers needed during a runtime
223 // call (this includes deoptimization)
224 // Note: note that users of this frame may well have arguments to some runtime
225 // while these values are on the stack. These positions neglect those arguments
226 // but the code in save_live_registers will take the argument count into
227 // account.
228 //
229
230 enum reg_save_layout {
231 reg_save_frame_size = 32 /* float */ + 32 /* integer */
232 };
233
234 // Save off registers which might be killed by calls into the runtime.
235 // Tries to smart of about FP registers. In particular we separate
236 // saving and describing the FPU registers for deoptimization since we
237 // have to save the FPU registers twice if we describe them. The
238 // deopt blob is the only thing which needs to describe FPU registers.
239 // In all other cases it should be sufficient to simply save their
240 // current value.
241
242 static int cpu_reg_save_offsets[FrameMap::nof_cpu_regs];
243 static int fpu_reg_save_offsets[FrameMap::nof_fpu_regs];
244 static int reg_save_size_in_words;
245 static int frame_size_in_bytes = -1;
246
247 static OopMap* generate_oop_map(StubAssembler* sasm, bool save_fpu_registers) {
248 int frame_size_in_bytes = reg_save_frame_size * BytesPerWord;
249 sasm->set_frame_size(frame_size_in_bytes / BytesPerWord);
250 int frame_size_in_slots = frame_size_in_bytes / sizeof(jint);
251 OopMap* oop_map = new OopMap(frame_size_in_slots, 0);
252
253 for (int i = 0; i < FrameMap::nof_cpu_regs; i++) {
254 Register r = as_Register(i);
255 if (i <= 18 && i != rscratch1->encoding() && i != rscratch2->encoding()) {
256 int sp_offset = cpu_reg_save_offsets[i];
257 oop_map->set_callee_saved(VMRegImpl::stack2reg(sp_offset),
258 r->as_VMReg());
259 }
260 }
261
262 if (save_fpu_registers) {
263 for (int i = 0; i < FrameMap::nof_fpu_regs; i++) {
264 FloatRegister r = as_FloatRegister(i);
265 {
266 int sp_offset = fpu_reg_save_offsets[i];
267 oop_map->set_callee_saved(VMRegImpl::stack2reg(sp_offset),
268 r->as_VMReg());
269 }
270 }
271 }
272 return oop_map;
273 }
274
275 static OopMap* save_live_registers(StubAssembler* sasm,
276 bool save_fpu_registers = true) {
277 __ block_comment("save_live_registers");
278
279 __ push(RegSet::range(r0, r29), sp); // integer registers except lr & sp
280
281 if (save_fpu_registers) {
282 for (int i = 31; i>= 0; i -= 4) {
283 __ sub(sp, sp, 4 * wordSize); // no pre-increment for st1. Emulate it without modifying other registers
284 __ st1(as_FloatRegister(i-3), as_FloatRegister(i-2), as_FloatRegister(i-1),
285 as_FloatRegister(i), __ T1D, Address(sp));
286 }
287 } else {
288 __ add(sp, sp, -32 * wordSize);
289 }
290
291 return generate_oop_map(sasm, save_fpu_registers);
292 }
293
294 static void restore_live_registers(StubAssembler* sasm, bool restore_fpu_registers = true) {
295 if (restore_fpu_registers) {
296 for (int i = 0; i < 32; i += 4)
297 __ ld1(as_FloatRegister(i), as_FloatRegister(i+1), as_FloatRegister(i+2),
298 as_FloatRegister(i+3), __ T1D, Address(__ post(sp, 4 * wordSize)));
299 } else {
300 __ add(sp, sp, 32 * wordSize);
301 }
302
303 __ pop(RegSet::range(r0, r29), sp);
304 }
305
306 static void restore_live_registers_except_r0(StubAssembler* sasm, bool restore_fpu_registers = true) {
307
308 if (restore_fpu_registers) {
309 for (int i = 0; i < 32; i += 4)
310 __ ld1(as_FloatRegister(i), as_FloatRegister(i+1), as_FloatRegister(i+2),
311 as_FloatRegister(i+3), __ T1D, Address(__ post(sp, 4 * wordSize)));
312 } else {
313 __ add(sp, sp, 32 * wordSize);
314 }
315
316 __ ldp(zr, r1, Address(__ post(sp, 16)));
317 __ pop(RegSet::range(r2, r29), sp);
318 }
319
320
321
322 void Runtime1::initialize_pd() {
323 int i;
324 int sp_offset = 0;
325
326 // all float registers are saved explicitly
327 assert(FrameMap::nof_fpu_regs == 32, "double registers not handled here");
328 for (i = 0; i < FrameMap::nof_fpu_regs; i++) {
329 fpu_reg_save_offsets[i] = sp_offset;
330 sp_offset += 2; // SP offsets are in halfwords
331 }
332
333 for (i = 0; i < FrameMap::nof_cpu_regs; i++) {
334 Register r = as_Register(i);
335 cpu_reg_save_offsets[i] = sp_offset;
336 sp_offset += 2; // SP offsets are in halfwords
337 }
338 }
339
340
341 // target: the entry point of the method that creates and posts the exception oop
342 // has_argument: true if the exception needs arguments (passed in rscratch1 and rscratch2)
343
344 OopMapSet* Runtime1::generate_exception_throw(StubAssembler* sasm, address target, bool has_argument) {
345 // make a frame and preserve the caller's caller-save registers
346 OopMap* oop_map = save_live_registers(sasm);
347 int call_offset;
348 if (!has_argument) {
349 call_offset = __ call_RT(noreg, noreg, target);
350 } else {
351 __ mov(c_rarg1, rscratch1);
352 __ mov(c_rarg2, rscratch2);
353 call_offset = __ call_RT(noreg, noreg, target);
354 }
355 OopMapSet* oop_maps = new OopMapSet();
356 oop_maps->add_gc_map(call_offset, oop_map);
357 return oop_maps;
358 }
359
360
361 OopMapSet* Runtime1::generate_handle_exception(StubID id, StubAssembler *sasm) {
362 __ block_comment("generate_handle_exception");
363
364 // incoming parameters
365 const Register exception_oop = r0;
366 const Register exception_pc = r3;
367 // other registers used in this stub
368
369 // Save registers, if required.
370 OopMapSet* oop_maps = new OopMapSet();
371 OopMap* oop_map = nullptr;
372 switch (id) {
373 case forward_exception_id:
374 // We're handling an exception in the context of a compiled frame.
375 // The registers have been saved in the standard places. Perform
376 // an exception lookup in the caller and dispatch to the handler
377 // if found. Otherwise unwind and dispatch to the callers
378 // exception handler.
379 oop_map = generate_oop_map(sasm, 1 /*thread*/);
380
381 // load and clear pending exception oop into r0
382 __ ldr(exception_oop, Address(rthread, Thread::pending_exception_offset()));
383 __ str(zr, Address(rthread, Thread::pending_exception_offset()));
384
385 // load issuing PC (the return address for this stub) into r3
386 __ ldr(exception_pc, Address(rfp, 1*BytesPerWord));
387 __ authenticate_return_address(exception_pc);
388
389 // make sure that the vm_results are cleared (may be unnecessary)
390 __ str(zr, Address(rthread, JavaThread::vm_result_offset()));
391 __ str(zr, Address(rthread, JavaThread::vm_result_2_offset()));
392 break;
393 case handle_exception_nofpu_id:
394 case handle_exception_id:
395 // At this point all registers MAY be live.
396 oop_map = save_live_registers(sasm, id != handle_exception_nofpu_id);
397 break;
398 case handle_exception_from_callee_id: {
399 // At this point all registers except exception oop (r0) and
400 // exception pc (lr) are dead.
401 const int frame_size = 2 /*fp, return address*/;
402 oop_map = new OopMap(frame_size * VMRegImpl::slots_per_word, 0);
403 sasm->set_frame_size(frame_size);
404 break;
405 }
406 default: ShouldNotReachHere();
407 }
408
409 // verify that only r0 and r3 are valid at this time
410 __ invalidate_registers(false, true, true, false, true, true);
411 // verify that r0 contains a valid exception
412 __ verify_not_null_oop(exception_oop);
413
414 #ifdef ASSERT
415 // check that fields in JavaThread for exception oop and issuing pc are
416 // empty before writing to them
417 Label oop_empty;
418 __ ldr(rscratch1, Address(rthread, JavaThread::exception_oop_offset()));
419 __ cbz(rscratch1, oop_empty);
420 __ stop("exception oop already set");
421 __ bind(oop_empty);
422
423 Label pc_empty;
424 __ ldr(rscratch1, Address(rthread, JavaThread::exception_pc_offset()));
425 __ cbz(rscratch1, pc_empty);
426 __ stop("exception pc already set");
427 __ bind(pc_empty);
428 #endif
429
430 // save exception oop and issuing pc into JavaThread
431 // (exception handler will load it from here)
432 __ str(exception_oop, Address(rthread, JavaThread::exception_oop_offset()));
433 __ str(exception_pc, Address(rthread, JavaThread::exception_pc_offset()));
434
435 // patch throwing pc into return address (has bci & oop map)
436 __ protect_return_address(exception_pc);
437 __ str(exception_pc, Address(rfp, 1*BytesPerWord));
438
439 // compute the exception handler.
440 // the exception oop and the throwing pc are read from the fields in JavaThread
441 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, exception_handler_for_pc));
442 oop_maps->add_gc_map(call_offset, oop_map);
443
444 // r0: handler address
445 // will be the deopt blob if nmethod was deoptimized while we looked up
446 // handler regardless of whether handler existed in the nmethod.
447
448 // only r0 is valid at this time, all other registers have been destroyed by the runtime call
449 __ invalidate_registers(false, true, true, true, true, true);
450
451 // patch the return address, this stub will directly return to the exception handler
452 __ protect_return_address(r0);
453 __ str(r0, Address(rfp, 1*BytesPerWord));
454
455 switch (id) {
456 case forward_exception_id:
457 case handle_exception_nofpu_id:
458 case handle_exception_id:
459 // Restore the registers that were saved at the beginning.
460 restore_live_registers(sasm, id != handle_exception_nofpu_id);
461 break;
462 case handle_exception_from_callee_id:
463 break;
464 default: ShouldNotReachHere();
465 }
466
467 return oop_maps;
468 }
469
470
471 void Runtime1::generate_unwind_exception(StubAssembler *sasm) {
472 // incoming parameters
473 const Register exception_oop = r0;
474 // callee-saved copy of exception_oop during runtime call
475 const Register exception_oop_callee_saved = r19;
476 // other registers used in this stub
477 const Register exception_pc = r3;
478 const Register handler_addr = r1;
479
480 if (AbortVMOnException) {
481 __ mov(rscratch1, exception_oop);
482 __ enter();
483 save_live_registers(sasm);
484 __ call_VM_leaf(CAST_FROM_FN_PTR(address, check_abort_on_vm_exception), rscratch1);
485 restore_live_registers(sasm);
486 __ leave();
487 }
488
489 // verify that only r0, is valid at this time
490 __ invalidate_registers(false, true, true, true, true, true);
491
492 #ifdef ASSERT
493 // check that fields in JavaThread for exception oop and issuing pc are empty
494 Label oop_empty;
495 __ ldr(rscratch1, Address(rthread, JavaThread::exception_oop_offset()));
496 __ cbz(rscratch1, oop_empty);
497 __ stop("exception oop must be empty");
498 __ bind(oop_empty);
499
500 Label pc_empty;
501 __ ldr(rscratch1, Address(rthread, JavaThread::exception_pc_offset()));
502 __ cbz(rscratch1, pc_empty);
503 __ stop("exception pc must be empty");
504 __ bind(pc_empty);
505 #endif
506
507 // Save our return address because
508 // exception_handler_for_return_address will destroy it. We also
509 // save exception_oop
510 __ mov(r3, lr);
511 __ protect_return_address();
512 __ stp(lr, exception_oop, Address(__ pre(sp, -2 * wordSize)));
513
514 // search the exception handler address of the caller (using the return address)
515 __ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::exception_handler_for_return_address), rthread, r3);
516 // r0: exception handler address of the caller
517
518 // Only R0 is valid at this time; all other registers have been
519 // destroyed by the call.
520 __ invalidate_registers(false, true, true, true, false, true);
521
522 // move result of call into correct register
523 __ mov(handler_addr, r0);
524
525 // get throwing pc (= return address).
526 // lr has been destroyed by the call
527 __ ldp(lr, exception_oop, Address(__ post(sp, 2 * wordSize)));
528 __ authenticate_return_address();
529 __ mov(r3, lr);
530
531 __ verify_not_null_oop(exception_oop);
532
533 // continue at exception handler (return address removed)
534 // note: do *not* remove arguments when unwinding the
535 // activation since the caller assumes having
536 // all arguments on the stack when entering the
537 // runtime to determine the exception handler
538 // (GC happens at call site with arguments!)
539 // r0: exception oop
540 // r3: throwing pc
541 // r1: exception handler
542 __ br(handler_addr);
543 }
544
545
546
547 OopMapSet* Runtime1::generate_patching(StubAssembler* sasm, address target) {
548 // use the maximum number of runtime-arguments here because it is difficult to
549 // distinguish each RT-Call.
550 // Note: This number affects also the RT-Call in generate_handle_exception because
551 // the oop-map is shared for all calls.
552 DeoptimizationBlob* deopt_blob = SharedRuntime::deopt_blob();
553 assert(deopt_blob != nullptr, "deoptimization blob must have been created");
554
555 OopMap* oop_map = save_live_registers(sasm);
556
557 __ mov(c_rarg0, rthread);
558 Label retaddr;
559 __ set_last_Java_frame(sp, rfp, retaddr, rscratch1);
560 // do the call
561 __ lea(rscratch1, RuntimeAddress(target));
562 __ blr(rscratch1);
563 __ bind(retaddr);
564 OopMapSet* oop_maps = new OopMapSet();
565 oop_maps->add_gc_map(__ offset(), oop_map);
566 // verify callee-saved register
567 #ifdef ASSERT
568 { Label L;
569 __ get_thread(rscratch1);
570 __ cmp(rthread, rscratch1);
571 __ br(Assembler::EQ, L);
572 __ stop("StubAssembler::call_RT: rthread not callee saved?");
573 __ bind(L);
574 }
575 #endif
576
577 __ reset_last_Java_frame(true);
578
579 #ifdef ASSERT
580 // check that fields in JavaThread for exception oop and issuing pc are empty
581 Label oop_empty;
582 __ ldr(rscratch1, Address(rthread, Thread::pending_exception_offset()));
583 __ cbz(rscratch1, oop_empty);
584 __ stop("exception oop must be empty");
585 __ bind(oop_empty);
586
587 Label pc_empty;
588 __ ldr(rscratch1, Address(rthread, JavaThread::exception_pc_offset()));
589 __ cbz(rscratch1, pc_empty);
590 __ stop("exception pc must be empty");
591 __ bind(pc_empty);
592 #endif
593
594 // Runtime will return true if the nmethod has been deoptimized, this is the
595 // expected scenario and anything else is an error. Note that we maintain a
596 // check on the result purely as a defensive measure.
597 Label no_deopt;
598 __ cbz(r0, no_deopt); // Have we deoptimized?
599
600 // Perform a re-execute. The proper return address is already on the stack,
601 // we just need to restore registers, pop all of our frame but the return
602 // address and jump to the deopt blob.
603 restore_live_registers(sasm);
604 __ leave();
605 __ far_jump(RuntimeAddress(deopt_blob->unpack_with_reexecution()));
606
607 __ bind(no_deopt);
608 __ stop("deopt not performed");
609
610 return oop_maps;
611 }
612
613
614 OopMapSet* Runtime1::generate_code_for(StubID id, StubAssembler* sasm) {
615
616 const Register exception_oop = r0;
617 const Register exception_pc = r3;
618
619 // for better readability
620 const bool must_gc_arguments = true;
621 const bool dont_gc_arguments = false;
622
623 // default value; overwritten for some optimized stubs that are called from methods that do not use the fpu
624 bool save_fpu_registers = true;
625
626 // stub code & info for the different stubs
627 OopMapSet* oop_maps = nullptr;
628 OopMap* oop_map = nullptr;
629 switch (id) {
630 {
631 case forward_exception_id:
632 {
633 oop_maps = generate_handle_exception(id, sasm);
634 __ leave();
635 __ ret(lr);
636 }
637 break;
638
639 case throw_div0_exception_id:
640 { StubFrame f(sasm, "throw_div0_exception", dont_gc_arguments, does_not_return);
641 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_div0_exception), false);
642 }
643 break;
644
645 case throw_null_pointer_exception_id:
646 { StubFrame f(sasm, "throw_null_pointer_exception", dont_gc_arguments, does_not_return);
647 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_null_pointer_exception), false);
648 }
649 break;
650
651 case new_instance_id:
652 case fast_new_instance_id:
653 case fast_new_instance_init_check_id:
654 {
655 Register klass = r3; // Incoming
656 Register obj = r0; // Result
657
658 if (id == new_instance_id) {
659 __ set_info("new_instance", dont_gc_arguments);
660 } else if (id == fast_new_instance_id) {
661 __ set_info("fast new_instance", dont_gc_arguments);
662 } else {
663 assert(id == fast_new_instance_init_check_id, "bad StubID");
664 __ set_info("fast new_instance init check", dont_gc_arguments);
665 }
666
667 __ enter();
668 OopMap* map = save_live_registers(sasm);
669 int call_offset;
670 call_offset = __ call_RT(obj, noreg, CAST_FROM_FN_PTR(address, new_instance), klass);
671 oop_maps = new OopMapSet();
672 oop_maps->add_gc_map(call_offset, map);
673 restore_live_registers_except_r0(sasm);
674 __ verify_oop(obj);
675 __ leave();
676 __ ret(lr);
677
678 // r0,: new instance
679 }
680
681 break;
682
683 case counter_overflow_id:
684 {
685 Register bci = r0, method = r1;
686 __ enter();
687 OopMap* map = save_live_registers(sasm);
688 // Retrieve bci
689 __ ldrw(bci, Address(rfp, 2*BytesPerWord));
690 // And a pointer to the Method*
691 __ ldr(method, Address(rfp, 3*BytesPerWord));
692 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, counter_overflow), bci, method);
693 oop_maps = new OopMapSet();
694 oop_maps->add_gc_map(call_offset, map);
695 restore_live_registers(sasm);
696 __ leave();
697 __ ret(lr);
698 }
699 break;
700
701 case new_type_array_id:
702 case new_object_array_id:
703 case new_null_free_array_id:
704 {
705 Register length = r19; // Incoming
706 Register klass = r3; // Incoming
707 Register obj = r0; // Result
708
709 if (id == new_type_array_id) {
710 __ set_info("new_type_array", dont_gc_arguments);
711 } else if (id == new_object_array_id) {
712 __ set_info("new_object_array", dont_gc_arguments);
713 } else {
714 __ set_info("new_null_free_array", dont_gc_arguments);
715 }
716
717 #ifdef ASSERT
718 // assert object type is really an array of the proper kind
719 {
720 Label ok;
721 Register t0 = obj;
722 __ ldrw(t0, Address(klass, Klass::layout_helper_offset()));
723 __ asrw(t0, t0, Klass::_lh_array_tag_shift);
724 switch (id) {
725 case new_type_array_id:
726 __ cmpw(t0, Klass::_lh_array_tag_type_value);
727 __ br(Assembler::EQ, ok);
728 __ stop("assert(is a type array klass)");
729 break;
730 case new_object_array_id:
731 __ cmpw(t0, Klass::_lh_array_tag_obj_value); // new "[Ljava/lang/Object;"
732 __ br(Assembler::EQ, ok);
733 __ cmpw(t0, Klass::_lh_array_tag_vt_value); // new "[LVT;"
734 __ br(Assembler::EQ, ok);
735 __ stop("assert(is an object or inline type array klass)");
736 break;
737 case new_null_free_array_id:
738 __ cmpw(t0, Klass::_lh_array_tag_vt_value); // the array can be a flat array.
739 __ br(Assembler::EQ, ok);
740 __ cmpw(t0, Klass::_lh_array_tag_obj_value); // the array cannot be a flat array (due to InlineArrayElementMaxFlatSize, etc)
741 __ br(Assembler::EQ, ok);
742 __ stop("assert(is an object or inline type array klass)");
743 break;
744 default: ShouldNotReachHere();
745 }
746 __ should_not_reach_here();
747 __ bind(ok);
748 }
749 #endif // ASSERT
750
751 __ enter();
752 OopMap* map = save_live_registers(sasm);
753 int call_offset;
754 if (id == new_type_array_id) {
755 call_offset = __ call_RT(obj, noreg, CAST_FROM_FN_PTR(address, new_type_array), klass, length);
756 } else if (id == new_object_array_id) {
757 call_offset = __ call_RT(obj, noreg, CAST_FROM_FN_PTR(address, new_object_array), klass, length);
758 } else {
759 assert(id == new_null_free_array_id, "must be");
760 call_offset = __ call_RT(obj, noreg, CAST_FROM_FN_PTR(address, new_null_free_array), klass, length);
761 }
762
763 oop_maps = new OopMapSet();
764 oop_maps->add_gc_map(call_offset, map);
765 restore_live_registers_except_r0(sasm);
766
767 __ verify_oop(obj);
768 __ leave();
769 __ ret(lr);
770
771 // r0: new array
772 }
773 break;
774
775 case new_multi_array_id:
776 { StubFrame f(sasm, "new_multi_array", dont_gc_arguments);
777 // r0,: klass
778 // r19,: rank
779 // r2: address of 1st dimension
780 OopMap* map = save_live_registers(sasm);
781 __ mov(c_rarg1, r0);
782 __ mov(c_rarg3, r2);
783 __ mov(c_rarg2, r19);
784 int call_offset = __ call_RT(r0, noreg, CAST_FROM_FN_PTR(address, new_multi_array), r1, r2, r3);
785
786 oop_maps = new OopMapSet();
787 oop_maps->add_gc_map(call_offset, map);
788 restore_live_registers_except_r0(sasm);
789
790 // r0,: new multi array
791 __ verify_oop(r0);
792 }
793 break;
794
795 case buffer_inline_args_id:
796 case buffer_inline_args_no_receiver_id:
797 {
798 const char* name = (id == buffer_inline_args_id) ?
799 "buffer_inline_args" : "buffer_inline_args_no_receiver";
800 StubFrame f(sasm, name, dont_gc_arguments);
801 OopMap* map = save_live_registers(sasm);
802 Register method = r19; // Incoming
803 address entry = (id == buffer_inline_args_id) ?
804 CAST_FROM_FN_PTR(address, buffer_inline_args) :
805 CAST_FROM_FN_PTR(address, buffer_inline_args_no_receiver);
806 // This is called from a C1 method's scalarized entry point
807 // where r0-r7 may be holding live argument values so we can't
808 // return the result in r0 as the other stubs do. LR is used as
809 // a temporay below to avoid the result being clobbered by
810 // restore_live_registers.
811 int call_offset = __ call_RT(lr, noreg, entry, method);
812 oop_maps = new OopMapSet();
813 oop_maps->add_gc_map(call_offset, map);
814 restore_live_registers(sasm);
815 __ mov(r20, lr);
816 __ verify_oop(r20); // r20: an array of buffered value objects
817 }
818 break;
819
820 case load_flat_array_id:
821 {
822 StubFrame f(sasm, "load_flat_array", dont_gc_arguments);
823 OopMap* map = save_live_registers(sasm);
824
825 // Called with store_parameter and not C abi
826
827 f.load_argument(1, r0); // r0,: array
828 f.load_argument(0, r1); // r1,: index
829 int call_offset = __ call_RT(r0, noreg, CAST_FROM_FN_PTR(address, load_flat_array), r0, r1);
830
831 // Ensure the stores that initialize the buffer are visible
832 // before any subsequent store that publishes this reference.
833 __ membar(Assembler::StoreStore);
834
835 oop_maps = new OopMapSet();
836 oop_maps->add_gc_map(call_offset, map);
837 restore_live_registers_except_r0(sasm);
838
839 // r0: loaded element at array[index]
840 __ verify_oop(r0);
841 }
842 break;
843
844 case store_flat_array_id:
845 {
846 StubFrame f(sasm, "store_flat_array", dont_gc_arguments);
847 OopMap* map = save_live_registers(sasm, 4);
848
849 // Called with store_parameter and not C abi
850
851 f.load_argument(2, r0); // r0: array
852 f.load_argument(1, r1); // r1: index
853 f.load_argument(0, r2); // r2: value
854 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, store_flat_array), r0, r1, r2);
855
856 oop_maps = new OopMapSet();
857 oop_maps->add_gc_map(call_offset, map);
858 restore_live_registers_except_r0(sasm);
859 }
860 break;
861
862 case substitutability_check_id:
863 {
864 StubFrame f(sasm, "substitutability_check", dont_gc_arguments);
865 OopMap* map = save_live_registers(sasm);
866
867 // Called with store_parameter and not C abi
868
869 f.load_argument(1, r1); // r1,: left
870 f.load_argument(0, r2); // r2,: right
871 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, substitutability_check), r1, r2);
872
873 oop_maps = new OopMapSet();
874 oop_maps->add_gc_map(call_offset, map);
875 restore_live_registers_except_r0(sasm);
876
877 // r0,: are the two operands substitutable
878 }
879 break;
880
881 case register_finalizer_id:
882 {
883 __ set_info("register_finalizer", dont_gc_arguments);
884
885 // This is called via call_runtime so the arguments
886 // will be place in C abi locations
887
888 __ verify_oop(c_rarg0);
889
890 // load the klass and check the has finalizer flag
891 Label register_finalizer;
892 Register t = r5;
893 __ load_klass(t, r0);
894 __ ldrw(t, Address(t, Klass::access_flags_offset()));
895 __ tbnz(t, exact_log2(JVM_ACC_HAS_FINALIZER), register_finalizer);
896 __ ret(lr);
897
898 __ bind(register_finalizer);
899 __ enter();
900 OopMap* oop_map = save_live_registers(sasm);
901 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, SharedRuntime::register_finalizer), r0);
902 oop_maps = new OopMapSet();
903 oop_maps->add_gc_map(call_offset, oop_map);
904
905 // Now restore all the live registers
906 restore_live_registers(sasm);
907
908 __ leave();
909 __ ret(lr);
910 }
911 break;
912
913 case throw_class_cast_exception_id:
914 { StubFrame f(sasm, "throw_class_cast_exception", dont_gc_arguments, does_not_return);
915 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_class_cast_exception), true);
916 }
917 break;
918
919 case throw_incompatible_class_change_error_id:
920 { StubFrame f(sasm, "throw_incompatible_class_change_error", dont_gc_arguments, does_not_return);
921 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_incompatible_class_change_error), false);
922 }
923 break;
924
925 case throw_illegal_monitor_state_exception_id:
926 { StubFrame f(sasm, "throw_illegal_monitor_state_exception", dont_gc_arguments);
927 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_illegal_monitor_state_exception), false);
928 }
929 break;
930
931 case throw_identity_exception_id:
932 { StubFrame f(sasm, "throw_identity_exception", dont_gc_arguments);
933 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_identity_exception), true);
934 }
935 break;
936
937 case slow_subtype_check_id:
938 {
939 // Typical calling sequence:
940 // __ push(klass_RInfo); // object klass or other subclass
941 // __ push(sup_k_RInfo); // array element klass or other superclass
942 // __ bl(slow_subtype_check);
943 // Note that the subclass is pushed first, and is therefore deepest.
944 enum layout {
945 r0_off, r0_off_hi,
946 r2_off, r2_off_hi,
947 r4_off, r4_off_hi,
948 r5_off, r5_off_hi,
949 sup_k_off, sup_k_off_hi,
950 klass_off, klass_off_hi,
951 framesize,
952 result_off = sup_k_off
953 };
954
955 __ set_info("slow_subtype_check", dont_gc_arguments);
956 __ push(RegSet::of(r0, r2, r4, r5), sp);
957
958 // This is called by pushing args and not with C abi
959 // __ ldr(r4, Address(sp, (klass_off) * VMRegImpl::stack_slot_size)); // subclass
960 // __ ldr(r0, Address(sp, (sup_k_off) * VMRegImpl::stack_slot_size)); // superclass
961
962 __ ldp(r4, r0, Address(sp, (sup_k_off) * VMRegImpl::stack_slot_size));
963
964 Label miss;
965 __ check_klass_subtype_slow_path(r4, r0, r2, r5, nullptr, &miss);
966
967 // fallthrough on success:
968 __ mov(rscratch1, 1);
969 __ str(rscratch1, Address(sp, (result_off) * VMRegImpl::stack_slot_size)); // result
970 __ pop(RegSet::of(r0, r2, r4, r5), sp);
971 __ ret(lr);
972
973 __ bind(miss);
974 __ str(zr, Address(sp, (result_off) * VMRegImpl::stack_slot_size)); // result
975 __ pop(RegSet::of(r0, r2, r4, r5), sp);
976 __ ret(lr);
977 }
978 break;
979
980 case monitorenter_nofpu_id:
981 save_fpu_registers = false;
982 // fall through
983 case monitorenter_id:
984 {
985 StubFrame f(sasm, "monitorenter", dont_gc_arguments);
986 OopMap* map = save_live_registers(sasm, save_fpu_registers);
987
988 // Called with store_parameter and not C abi
989
990 f.load_argument(1, r0); // r0,: object
991 f.load_argument(0, r1); // r1,: lock address
992
993 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, monitorenter), r0, r1);
994
995 oop_maps = new OopMapSet();
996 oop_maps->add_gc_map(call_offset, map);
997 restore_live_registers(sasm, save_fpu_registers);
998 }
999 break;
1000
1001 case monitorexit_nofpu_id:
1002 save_fpu_registers = false;
1003 // fall through
1004 case monitorexit_id:
1005 {
1006 StubFrame f(sasm, "monitorexit", dont_gc_arguments);
1007 OopMap* map = save_live_registers(sasm, save_fpu_registers);
1008
1009 // Called with store_parameter and not C abi
1010
1011 f.load_argument(0, r0); // r0,: lock address
1012
1013 // note: really a leaf routine but must setup last java sp
1014 // => use call_RT for now (speed can be improved by
1015 // doing last java sp setup manually)
1016 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, monitorexit), r0);
1017
1018 oop_maps = new OopMapSet();
1019 oop_maps->add_gc_map(call_offset, map);
1020 restore_live_registers(sasm, save_fpu_registers);
1021 }
1022 break;
1023
1024 case deoptimize_id:
1025 {
1026 StubFrame f(sasm, "deoptimize", dont_gc_arguments, does_not_return);
1027 OopMap* oop_map = save_live_registers(sasm);
1028 f.load_argument(0, c_rarg1);
1029 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, deoptimize), c_rarg1);
1030
1031 oop_maps = new OopMapSet();
1032 oop_maps->add_gc_map(call_offset, oop_map);
1033 restore_live_registers(sasm);
1034 DeoptimizationBlob* deopt_blob = SharedRuntime::deopt_blob();
1035 assert(deopt_blob != nullptr, "deoptimization blob must have been created");
1036 __ leave();
1037 __ far_jump(RuntimeAddress(deopt_blob->unpack_with_reexecution()));
1038 }
1039 break;
1040
1041 case throw_range_check_failed_id:
1042 { StubFrame f(sasm, "range_check_failed", dont_gc_arguments, does_not_return);
1043 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_range_check_exception), true);
1044 }
1045 break;
1046
1047 case unwind_exception_id:
1048 { __ set_info("unwind_exception", dont_gc_arguments);
1049 // note: no stubframe since we are about to leave the current
1050 // activation and we are calling a leaf VM function only.
1051 generate_unwind_exception(sasm);
1052 }
1053 break;
1054
1055 case access_field_patching_id:
1056 { StubFrame f(sasm, "access_field_patching", dont_gc_arguments, does_not_return);
1057 // we should set up register map
1058 oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, access_field_patching));
1059 }
1060 break;
1061
1062 case load_klass_patching_id:
1063 { StubFrame f(sasm, "load_klass_patching", dont_gc_arguments, does_not_return);
1064 // we should set up register map
1065 oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, move_klass_patching));
1066 }
1067 break;
1068
1069 case load_mirror_patching_id:
1070 { StubFrame f(sasm, "load_mirror_patching", dont_gc_arguments, does_not_return);
1071 // we should set up register map
1072 oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, move_mirror_patching));
1073 }
1074 break;
1075
1076 case load_appendix_patching_id:
1077 { StubFrame f(sasm, "load_appendix_patching", dont_gc_arguments, does_not_return);
1078 // we should set up register map
1079 oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, move_appendix_patching));
1080 }
1081 break;
1082
1083 case handle_exception_nofpu_id:
1084 case handle_exception_id:
1085 { StubFrame f(sasm, "handle_exception", dont_gc_arguments);
1086 oop_maps = generate_handle_exception(id, sasm);
1087 }
1088 break;
1089
1090 case handle_exception_from_callee_id:
1091 { StubFrame f(sasm, "handle_exception_from_callee", dont_gc_arguments);
1092 oop_maps = generate_handle_exception(id, sasm);
1093 }
1094 break;
1095
1096 case throw_index_exception_id:
1097 { StubFrame f(sasm, "index_range_check_failed", dont_gc_arguments, does_not_return);
1098 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_index_exception), true);
1099 }
1100 break;
1101
1102 case throw_array_store_exception_id:
1103 { StubFrame f(sasm, "throw_array_store_exception", dont_gc_arguments, does_not_return);
1104 // tos + 0: link
1105 // + 1: return address
1106 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_array_store_exception), true);
1107 }
1108 break;
1109
1110 case predicate_failed_trap_id:
1111 {
1112 StubFrame f(sasm, "predicate_failed_trap", dont_gc_arguments, does_not_return);
1113
1114 OopMap* map = save_live_registers(sasm);
1115
1116 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, predicate_failed_trap));
1117 oop_maps = new OopMapSet();
1118 oop_maps->add_gc_map(call_offset, map);
1119 restore_live_registers(sasm);
1120 __ leave();
1121 DeoptimizationBlob* deopt_blob = SharedRuntime::deopt_blob();
1122 assert(deopt_blob != nullptr, "deoptimization blob must have been created");
1123
1124 __ far_jump(RuntimeAddress(deopt_blob->unpack_with_reexecution()));
1125 }
1126 break;
1127
1128 case dtrace_object_alloc_id:
1129 { // c_rarg0: object
1130 StubFrame f(sasm, "dtrace_object_alloc", dont_gc_arguments);
1131 save_live_registers(sasm);
1132
1133 __ call_VM_leaf(CAST_FROM_FN_PTR(address, static_cast<int (*)(oopDesc*)>(SharedRuntime::dtrace_object_alloc)), c_rarg0);
1134
1135 restore_live_registers(sasm);
1136 }
1137 break;
1138
1139 default:
1140 // FIXME: For unhandled trap_id this code fails with assert during vm intialization
1141 // rather than insert a call to unimplemented_entry
1142 { StubFrame f(sasm, "unimplemented entry", dont_gc_arguments, does_not_return);
1143 __ mov(r0, (int)id);
1144 __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, unimplemented_entry), r0);
1145 }
1146 break;
1147 }
1148 }
1149
1150
1151 return oop_maps;
1152 }
1153
1154 #undef __
1155
1156 const char *Runtime1::pd_name_for_address(address entry) { Unimplemented(); return 0; }