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/compiledICHolder.hpp"
42 #include "oops/oop.inline.hpp"
43 #include "prims/jvmtiExport.hpp"
44 #include "register_aarch64.hpp"
45 #include "runtime/sharedRuntime.hpp"
46 #include "runtime/signature.hpp"
47 #include "runtime/stubRoutines.hpp"
48 #include "runtime/vframe.hpp"
49 #include "runtime/vframeArray.hpp"
50 #include "utilities/powerOfTwo.hpp"
51 #include "vmreg_aarch64.inline.hpp"
52
53
54 // Implementation of StubAssembler
55
56 int StubAssembler::call_RT(Register oop_result1, Register metadata_result, address entry, int args_size) {
57 // setup registers
58 assert(!(oop_result1->is_valid() || metadata_result->is_valid()) || oop_result1 != metadata_result, "registers must be different");
59 assert(oop_result1 != rthread && metadata_result != rthread, "registers must be different");
60 assert(args_size >= 0, "illegal args_size");
61 bool align_stack = false;
62
63 mov(c_rarg0, rthread);
64 set_num_rt_args(0); // Nothing on stack
65
66 Label retaddr;
67 set_last_Java_frame(sp, rfp, retaddr, rscratch1);
68
69 // do the call
70 lea(rscratch1, RuntimeAddress(entry));
71 blr(rscratch1);
72 bind(retaddr);
73 int call_offset = offset();
74 // verify callee-saved register
75 #ifdef ASSERT
76 push(r0, sp);
77 { Label L;
78 get_thread(r0);
79 cmp(rthread, r0);
80 br(Assembler::EQ, L);
81 stop("StubAssembler::call_RT: rthread not callee saved?");
82 bind(L);
83 }
84 pop(r0, sp);
85 #endif
86 reset_last_Java_frame(true);
87
88 // check for pending exceptions
89 { Label L;
90 // check for pending exceptions (java_thread is set upon return)
91 ldr(rscratch1, Address(rthread, in_bytes(Thread::pending_exception_offset())));
92 cbz(rscratch1, L);
93 // exception pending => remove activation and forward to exception handler
94 // make sure that the vm_results are cleared
95 if (oop_result1->is_valid()) {
96 str(zr, Address(rthread, JavaThread::vm_result_offset()));
97 }
98 if (metadata_result->is_valid()) {
99 str(zr, Address(rthread, JavaThread::vm_result_2_offset()));
100 }
101 if (frame_size() == no_frame_size) {
102 leave();
103 far_jump(RuntimeAddress(StubRoutines::forward_exception_entry()));
104 } else if (_stub_id == Runtime1::forward_exception_id) {
105 should_not_reach_here();
106 } else {
107 far_jump(RuntimeAddress(Runtime1::entry_for(Runtime1::forward_exception_id)));
108 }
109 bind(L);
110 }
111 // get oop results if there are any and reset the values in the thread
112 if (oop_result1->is_valid()) {
113 get_vm_result(oop_result1, rthread);
114 }
115 if (metadata_result->is_valid()) {
116 get_vm_result_2(metadata_result, rthread);
117 }
118 return call_offset;
119 }
120
121
122 int StubAssembler::call_RT(Register oop_result1, Register metadata_result, address entry, Register arg1) {
123 mov(c_rarg1, arg1);
124 return call_RT(oop_result1, metadata_result, entry, 1);
125 }
126
127
128 int StubAssembler::call_RT(Register oop_result1, Register metadata_result, address entry, Register arg1, Register arg2) {
129 if (c_rarg1 == arg2) {
130 if (c_rarg2 == arg1) {
131 mov(rscratch1, arg1);
132 mov(arg1, arg2);
133 mov(arg2, rscratch1);
134 } else {
135 mov(c_rarg2, arg2);
136 mov(c_rarg1, arg1);
137 }
138 } else {
139 mov(c_rarg1, arg1);
140 mov(c_rarg2, arg2);
141 }
142 return call_RT(oop_result1, metadata_result, entry, 2);
143 }
144
145
146 int StubAssembler::call_RT(Register oop_result1, Register metadata_result, address entry, Register arg1, Register arg2, Register arg3) {
147 // if there is any conflict use the stack
148 if (arg1 == c_rarg2 || arg1 == c_rarg3 ||
149 arg2 == c_rarg1 || arg2 == c_rarg3 ||
150 arg3 == c_rarg1 || arg3 == c_rarg2) {
151 stp(arg3, arg2, Address(pre(sp, -2 * wordSize)));
152 stp(arg1, zr, Address(pre(sp, -2 * wordSize)));
153 ldp(c_rarg1, zr, Address(post(sp, 2 * wordSize)));
154 ldp(c_rarg3, c_rarg2, Address(post(sp, 2 * wordSize)));
155 } else {
156 mov(c_rarg1, arg1);
157 mov(c_rarg2, arg2);
158 mov(c_rarg3, arg3);
159 }
160 return call_RT(oop_result1, metadata_result, entry, 3);
161 }
162
163 enum return_state_t {
164 does_not_return, requires_return
165 };
166
167
168 // Implementation of StubFrame
169
170 class StubFrame: public StackObj {
171 private:
172 StubAssembler* _sasm;
173 bool _return_state;
174
175 public:
176 StubFrame(StubAssembler* sasm, const char* name, bool must_gc_arguments, return_state_t return_state=requires_return);
177 void load_argument(int offset_in_words, Register reg);
178
179 ~StubFrame();
180 };;
181
182 void StubAssembler::prologue(const char* name, bool must_gc_arguments) {
183 set_info(name, must_gc_arguments);
184 enter();
185 }
186
187 void StubAssembler::epilogue() {
188 leave();
189 ret(lr);
190 }
191
192 #define __ _sasm->
193
194 StubFrame::StubFrame(StubAssembler* sasm, const char* name, bool must_gc_arguments, return_state_t return_state) {
195 _sasm = sasm;
196 _return_state = return_state;
197 __ prologue(name, must_gc_arguments);
198 }
199
200 // load parameters that were stored with LIR_Assembler::store_parameter
201 // Note: offsets for store_parameter and load_argument must match
202 void StubFrame::load_argument(int offset_in_words, Register reg) {
203 __ load_parameter(offset_in_words, reg);
204 }
205
206 StubFrame::~StubFrame() {
207 if (_return_state == requires_return) {
208 __ epilogue();
209 } else {
210 __ should_not_reach_here();
211 }
212 }
213
214 #undef __
215
216
217 // Implementation of Runtime1
218
219 #define __ sasm->
220
221 const int float_regs_as_doubles_size_in_slots = pd_nof_fpu_regs_frame_map * 2;
222
223 // Stack layout for saving/restoring all the registers needed during a runtime
224 // call (this includes deoptimization)
225 // Note: note that users of this frame may well have arguments to some runtime
226 // while these values are on the stack. These positions neglect those arguments
227 // but the code in save_live_registers will take the argument count into
228 // account.
229 //
230
231 enum reg_save_layout {
232 reg_save_frame_size = 32 /* float */ + 32 /* integer */
233 };
234
235 // Save off registers which might be killed by calls into the runtime.
236 // Tries to smart of about FP registers. In particular we separate
237 // saving and describing the FPU registers for deoptimization since we
238 // have to save the FPU registers twice if we describe them. The
239 // deopt blob is the only thing which needs to describe FPU registers.
240 // In all other cases it should be sufficient to simply save their
241 // current value.
242
243 static int cpu_reg_save_offsets[FrameMap::nof_cpu_regs];
244 static int fpu_reg_save_offsets[FrameMap::nof_fpu_regs];
245 static int reg_save_size_in_words;
246 static int frame_size_in_bytes = -1;
247
248 static OopMap* generate_oop_map(StubAssembler* sasm, bool save_fpu_registers) {
249 int frame_size_in_bytes = reg_save_frame_size * BytesPerWord;
250 sasm->set_frame_size(frame_size_in_bytes / BytesPerWord);
251 int frame_size_in_slots = frame_size_in_bytes / sizeof(jint);
252 OopMap* oop_map = new OopMap(frame_size_in_slots, 0);
253
254 for (int i = 0; i < FrameMap::nof_cpu_regs; i++) {
255 Register r = as_Register(i);
256 if (i <= 18 && i != rscratch1->encoding() && i != rscratch2->encoding()) {
257 int sp_offset = cpu_reg_save_offsets[i];
258 oop_map->set_callee_saved(VMRegImpl::stack2reg(sp_offset),
259 r->as_VMReg());
260 }
261 }
262
263 if (save_fpu_registers) {
264 for (int i = 0; i < FrameMap::nof_fpu_regs; i++) {
265 FloatRegister r = as_FloatRegister(i);
266 {
267 int sp_offset = fpu_reg_save_offsets[i];
268 oop_map->set_callee_saved(VMRegImpl::stack2reg(sp_offset),
269 r->as_VMReg());
270 }
271 }
272 }
273 return oop_map;
274 }
275
276 static OopMap* save_live_registers(StubAssembler* sasm,
277 bool save_fpu_registers = true) {
278 __ block_comment("save_live_registers");
279
280 __ push(RegSet::range(r0, r29), sp); // integer registers except lr & sp
281
282 if (save_fpu_registers) {
283 for (int i = 31; i>= 0; i -= 4) {
284 __ sub(sp, sp, 4 * wordSize); // no pre-increment for st1. Emulate it without modifying other registers
285 __ st1(as_FloatRegister(i-3), as_FloatRegister(i-2), as_FloatRegister(i-1),
286 as_FloatRegister(i), __ T1D, Address(sp));
287 }
288 } else {
289 __ add(sp, sp, -32 * wordSize);
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, rscratch1);
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, rscratch1);
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, rscratch1);
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 // verify that only r0, is valid at this time
481 __ invalidate_registers(false, true, true, true, true, true);
482
483 #ifdef ASSERT
484 // check that fields in JavaThread for exception oop and issuing pc are empty
485 Label oop_empty;
486 __ ldr(rscratch1, Address(rthread, JavaThread::exception_oop_offset()));
487 __ cbz(rscratch1, oop_empty);
488 __ stop("exception oop must be empty");
489 __ bind(oop_empty);
490
491 Label pc_empty;
492 __ ldr(rscratch1, Address(rthread, JavaThread::exception_pc_offset()));
493 __ cbz(rscratch1, pc_empty);
494 __ stop("exception pc must be empty");
495 __ bind(pc_empty);
496 #endif
497
498 // Save our return address because
499 // exception_handler_for_return_address will destroy it. We also
500 // save exception_oop
501 __ mov(r3, lr);
502 __ protect_return_address();
503 __ stp(lr, exception_oop, Address(__ pre(sp, -2 * wordSize)));
504
505 // search the exception handler address of the caller (using the return address)
506 __ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::exception_handler_for_return_address), rthread, r3);
507 // r0: exception handler address of the caller
508
509 // Only R0 is valid at this time; all other registers have been
510 // destroyed by the call.
511 __ invalidate_registers(false, true, true, true, false, true);
512
513 // move result of call into correct register
514 __ mov(handler_addr, r0);
515
516 // get throwing pc (= return address).
517 // lr has been destroyed by the call
518 __ ldp(lr, exception_oop, Address(__ post(sp, 2 * wordSize)));
519 __ authenticate_return_address();
520 __ mov(r3, lr);
521
522 __ verify_not_null_oop(exception_oop);
523
524 // continue at exception handler (return address removed)
525 // note: do *not* remove arguments when unwinding the
526 // activation since the caller assumes having
527 // all arguments on the stack when entering the
528 // runtime to determine the exception handler
529 // (GC happens at call site with arguments!)
530 // r0: exception oop
531 // r3: throwing pc
532 // r1: exception handler
533 __ br(handler_addr);
534 }
535
536
537
538 OopMapSet* Runtime1::generate_patching(StubAssembler* sasm, address target) {
539 // use the maximum number of runtime-arguments here because it is difficult to
540 // distinguish each RT-Call.
541 // Note: This number affects also the RT-Call in generate_handle_exception because
542 // the oop-map is shared for all calls.
543 DeoptimizationBlob* deopt_blob = SharedRuntime::deopt_blob();
544 assert(deopt_blob != nullptr, "deoptimization blob must have been created");
545
546 OopMap* oop_map = save_live_registers(sasm);
547
548 __ mov(c_rarg0, rthread);
549 Label retaddr;
550 __ set_last_Java_frame(sp, rfp, retaddr, rscratch1);
551 // do the call
552 __ lea(rscratch1, RuntimeAddress(target));
553 __ blr(rscratch1);
554 __ bind(retaddr);
555 OopMapSet* oop_maps = new OopMapSet();
556 oop_maps->add_gc_map(__ offset(), oop_map);
557 // verify callee-saved register
558 #ifdef ASSERT
559 { Label L;
560 __ get_thread(rscratch1);
561 __ cmp(rthread, rscratch1);
562 __ br(Assembler::EQ, L);
563 __ stop("StubAssembler::call_RT: rthread not callee saved?");
564 __ bind(L);
565 }
566 #endif
567
568 __ reset_last_Java_frame(true);
569
570 #ifdef ASSERT
571 // check that fields in JavaThread for exception oop and issuing pc are empty
572 Label oop_empty;
573 __ ldr(rscratch1, Address(rthread, Thread::pending_exception_offset()));
574 __ cbz(rscratch1, oop_empty);
575 __ stop("exception oop must be empty");
576 __ bind(oop_empty);
577
578 Label pc_empty;
579 __ ldr(rscratch1, Address(rthread, JavaThread::exception_pc_offset()));
580 __ cbz(rscratch1, pc_empty);
581 __ stop("exception pc must be empty");
582 __ bind(pc_empty);
583 #endif
584
585 // Runtime will return true if the nmethod has been deoptimized, this is the
586 // expected scenario and anything else is an error. Note that we maintain a
587 // check on the result purely as a defensive measure.
588 Label no_deopt;
589 __ cbz(r0, no_deopt); // Have we deoptimized?
590
591 // Perform a re-execute. The proper return address is already on the stack,
592 // we just need to restore registers, pop all of our frame but the return
593 // address and jump to the deopt blob.
594 restore_live_registers(sasm);
595 __ leave();
596 __ far_jump(RuntimeAddress(deopt_blob->unpack_with_reexecution()));
597
598 __ bind(no_deopt);
599 __ stop("deopt not performed");
600
601 return oop_maps;
602 }
603
604
605 OopMapSet* Runtime1::generate_code_for(StubID id, StubAssembler* sasm) {
606
607 const Register exception_oop = r0;
608 const Register exception_pc = r3;
609
610 // for better readability
611 const bool must_gc_arguments = true;
612 const bool dont_gc_arguments = false;
613
614 // default value; overwritten for some optimized stubs that are called from methods that do not use the fpu
615 bool save_fpu_registers = true;
616
617 // stub code & info for the different stubs
618 OopMapSet* oop_maps = nullptr;
619 OopMap* oop_map = nullptr;
620 switch (id) {
621 {
622 case forward_exception_id:
623 {
624 oop_maps = generate_handle_exception(id, sasm);
625 __ leave();
626 __ ret(lr);
627 }
628 break;
629
630 case throw_div0_exception_id:
631 { StubFrame f(sasm, "throw_div0_exception", dont_gc_arguments, does_not_return);
632 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_div0_exception), false);
633 }
634 break;
635
636 case throw_null_pointer_exception_id:
637 { StubFrame f(sasm, "throw_null_pointer_exception", dont_gc_arguments, does_not_return);
638 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_null_pointer_exception), false);
639 }
640 break;
641
642 case new_instance_id:
643 case fast_new_instance_id:
644 case fast_new_instance_init_check_id:
645 {
646 Register klass = r3; // Incoming
647 Register obj = r0; // Result
648
649 if (id == new_instance_id) {
650 __ set_info("new_instance", dont_gc_arguments);
651 } else if (id == fast_new_instance_id) {
652 __ set_info("fast new_instance", dont_gc_arguments);
653 } else {
654 assert(id == fast_new_instance_init_check_id, "bad StubID");
655 __ set_info("fast new_instance init check", dont_gc_arguments);
656 }
657
658 __ enter();
659 OopMap* map = save_live_registers(sasm);
660 int call_offset = __ call_RT(obj, noreg, CAST_FROM_FN_PTR(address, new_instance), klass);
661 oop_maps = new OopMapSet();
662 oop_maps->add_gc_map(call_offset, map);
663 restore_live_registers_except_r0(sasm);
664 __ verify_oop(obj);
665 __ leave();
666 __ ret(lr);
667
668 // r0,: new instance
669 }
670
671 break;
672
673 case counter_overflow_id:
674 {
675 Register bci = r0, method = r1;
676 __ enter();
677 OopMap* map = save_live_registers(sasm);
678 // Retrieve bci
679 __ ldrw(bci, Address(rfp, 2*BytesPerWord));
680 // And a pointer to the Method*
681 __ ldr(method, Address(rfp, 3*BytesPerWord));
682 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, counter_overflow), bci, method);
683 oop_maps = new OopMapSet();
684 oop_maps->add_gc_map(call_offset, map);
685 restore_live_registers(sasm);
686 __ leave();
687 __ ret(lr);
688 }
689 break;
690
691 case new_type_array_id:
692 case new_object_array_id:
693 {
694 Register length = r19; // Incoming
695 Register klass = r3; // Incoming
696 Register obj = r0; // Result
697
698 if (id == new_type_array_id) {
699 __ set_info("new_type_array", dont_gc_arguments);
700 } else {
701 __ set_info("new_object_array", dont_gc_arguments);
702 }
703
704 #ifdef ASSERT
705 // assert object type is really an array of the proper kind
706 {
707 Label ok;
708 Register t0 = obj;
709 __ ldrw(t0, Address(klass, Klass::layout_helper_offset()));
710 __ asrw(t0, t0, Klass::_lh_array_tag_shift);
711 int tag = ((id == new_type_array_id)
712 ? Klass::_lh_array_tag_type_value
713 : Klass::_lh_array_tag_obj_value);
714 __ mov(rscratch1, tag);
715 __ cmpw(t0, rscratch1);
716 __ br(Assembler::EQ, ok);
717 __ stop("assert(is an array klass)");
718 __ should_not_reach_here();
719 __ bind(ok);
720 }
721 #endif // ASSERT
722
723 __ enter();
724 OopMap* map = save_live_registers(sasm);
725 int call_offset;
726 if (id == new_type_array_id) {
727 call_offset = __ call_RT(obj, noreg, CAST_FROM_FN_PTR(address, new_type_array), klass, length);
728 } else {
729 call_offset = __ call_RT(obj, noreg, CAST_FROM_FN_PTR(address, new_object_array), klass, length);
730 }
731
732 oop_maps = new OopMapSet();
733 oop_maps->add_gc_map(call_offset, map);
734 restore_live_registers_except_r0(sasm);
735
736 __ verify_oop(obj);
737 __ leave();
738 __ ret(lr);
739
740 // r0: new array
741 }
742 break;
743
744 case new_multi_array_id:
745 { StubFrame f(sasm, "new_multi_array", dont_gc_arguments);
746 // r0,: klass
747 // r19,: rank
748 // r2: address of 1st dimension
749 OopMap* map = save_live_registers(sasm);
750 __ mov(c_rarg1, r0);
751 __ mov(c_rarg3, r2);
752 __ mov(c_rarg2, r19);
753 int call_offset = __ call_RT(r0, noreg, CAST_FROM_FN_PTR(address, new_multi_array), r1, r2, r3);
754
755 oop_maps = new OopMapSet();
756 oop_maps->add_gc_map(call_offset, map);
757 restore_live_registers_except_r0(sasm);
758
759 // r0,: new multi array
760 __ verify_oop(r0);
761 }
762 break;
763
764 case register_finalizer_id:
765 {
766 __ set_info("register_finalizer", dont_gc_arguments);
767
768 // This is called via call_runtime so the arguments
769 // will be place in C abi locations
770
771 __ verify_oop(c_rarg0);
772
773 // load the klass and check the has finalizer flag
774 Label register_finalizer;
775 Register t = r5;
776 __ load_klass(t, r0);
777 __ ldrw(t, Address(t, Klass::access_flags_offset()));
778 __ tbnz(t, exact_log2(JVM_ACC_HAS_FINALIZER), register_finalizer);
779 __ ret(lr);
780
781 __ bind(register_finalizer);
782 __ enter();
783 OopMap* oop_map = save_live_registers(sasm);
784 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, SharedRuntime::register_finalizer), r0);
785 oop_maps = new OopMapSet();
786 oop_maps->add_gc_map(call_offset, oop_map);
787
788 // Now restore all the live registers
789 restore_live_registers(sasm);
790
791 __ leave();
792 __ ret(lr);
793 }
794 break;
795
796 case throw_class_cast_exception_id:
797 { StubFrame f(sasm, "throw_class_cast_exception", dont_gc_arguments, does_not_return);
798 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_class_cast_exception), true);
799 }
800 break;
801
802 case throw_incompatible_class_change_error_id:
803 { StubFrame f(sasm, "throw_incompatible_class_cast_exception", dont_gc_arguments, does_not_return);
804 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_incompatible_class_change_error), false);
805 }
806 break;
807
808 case slow_subtype_check_id:
809 {
810 // Typical calling sequence:
811 // __ push(klass_RInfo); // object klass or other subclass
812 // __ push(sup_k_RInfo); // array element klass or other superclass
813 // __ bl(slow_subtype_check);
814 // Note that the subclass is pushed first, and is therefore deepest.
815 enum layout {
816 r0_off, r0_off_hi,
817 r2_off, r2_off_hi,
818 r4_off, r4_off_hi,
819 r5_off, r5_off_hi,
820 sup_k_off, sup_k_off_hi,
821 klass_off, klass_off_hi,
822 framesize,
823 result_off = sup_k_off
824 };
825
826 __ set_info("slow_subtype_check", dont_gc_arguments);
827 __ push(RegSet::of(r0, r2, r4, r5), sp);
828
829 // This is called by pushing args and not with C abi
830 // __ ldr(r4, Address(sp, (klass_off) * VMRegImpl::stack_slot_size)); // subclass
831 // __ ldr(r0, Address(sp, (sup_k_off) * VMRegImpl::stack_slot_size)); // superclass
832
833 __ ldp(r4, r0, Address(sp, (sup_k_off) * VMRegImpl::stack_slot_size));
834
835 Label miss;
836 __ check_klass_subtype_slow_path(r4, r0, r2, r5, nullptr, &miss);
837
838 // fallthrough on success:
839 __ mov(rscratch1, 1);
840 __ str(rscratch1, Address(sp, (result_off) * VMRegImpl::stack_slot_size)); // result
841 __ pop(RegSet::of(r0, r2, r4, r5), sp);
842 __ ret(lr);
843
844 __ bind(miss);
845 __ str(zr, Address(sp, (result_off) * VMRegImpl::stack_slot_size)); // result
846 __ pop(RegSet::of(r0, r2, r4, r5), sp);
847 __ ret(lr);
848 }
849 break;
850
851 case monitorenter_nofpu_id:
852 save_fpu_registers = false;
853 // fall through
854 case monitorenter_id:
855 {
856 StubFrame f(sasm, "monitorenter", dont_gc_arguments);
857 OopMap* map = save_live_registers(sasm, save_fpu_registers);
858
859 // Called with store_parameter and not C abi
860
861 f.load_argument(1, r0); // r0,: object
862 f.load_argument(0, r1); // r1,: lock address
863
864 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, monitorenter), r0, r1);
865
866 oop_maps = new OopMapSet();
867 oop_maps->add_gc_map(call_offset, map);
868 restore_live_registers(sasm, save_fpu_registers);
869 }
870 break;
871
872 case monitorexit_nofpu_id:
873 save_fpu_registers = false;
874 // fall through
875 case monitorexit_id:
876 {
877 StubFrame f(sasm, "monitorexit", dont_gc_arguments);
878 OopMap* map = save_live_registers(sasm, save_fpu_registers);
879
880 // Called with store_parameter and not C abi
881
882 f.load_argument(0, r0); // r0,: lock address
883
884 // note: really a leaf routine but must setup last java sp
885 // => use call_RT for now (speed can be improved by
886 // doing last java sp setup manually)
887 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, monitorexit), r0);
888
889 oop_maps = new OopMapSet();
890 oop_maps->add_gc_map(call_offset, map);
891 restore_live_registers(sasm, save_fpu_registers);
892 }
893 break;
894
895 case deoptimize_id:
896 {
897 StubFrame f(sasm, "deoptimize", dont_gc_arguments, does_not_return);
898 OopMap* oop_map = save_live_registers(sasm);
899 f.load_argument(0, c_rarg1);
900 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, deoptimize), c_rarg1);
901
902 oop_maps = new OopMapSet();
903 oop_maps->add_gc_map(call_offset, oop_map);
904 restore_live_registers(sasm);
905 DeoptimizationBlob* deopt_blob = SharedRuntime::deopt_blob();
906 assert(deopt_blob != nullptr, "deoptimization blob must have been created");
907 __ leave();
908 __ far_jump(RuntimeAddress(deopt_blob->unpack_with_reexecution()));
909 }
910 break;
911
912 case throw_range_check_failed_id:
913 { StubFrame f(sasm, "range_check_failed", dont_gc_arguments, does_not_return);
914 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_range_check_exception), true);
915 }
916 break;
917
918 case unwind_exception_id:
919 { __ set_info("unwind_exception", dont_gc_arguments);
920 // note: no stubframe since we are about to leave the current
921 // activation and we are calling a leaf VM function only.
922 generate_unwind_exception(sasm);
923 }
924 break;
925
926 case access_field_patching_id:
927 { StubFrame f(sasm, "access_field_patching", dont_gc_arguments, does_not_return);
928 // we should set up register map
929 oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, access_field_patching));
930 }
931 break;
932
933 case load_klass_patching_id:
934 { StubFrame f(sasm, "load_klass_patching", dont_gc_arguments, does_not_return);
935 // we should set up register map
936 oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, move_klass_patching));
937 }
938 break;
939
940 case load_mirror_patching_id:
941 { StubFrame f(sasm, "load_mirror_patching", dont_gc_arguments, does_not_return);
942 // we should set up register map
943 oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, move_mirror_patching));
944 }
945 break;
946
947 case load_appendix_patching_id:
948 { StubFrame f(sasm, "load_appendix_patching", dont_gc_arguments, does_not_return);
949 // we should set up register map
950 oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, move_appendix_patching));
951 }
952 break;
953
954 case handle_exception_nofpu_id:
955 case handle_exception_id:
956 { StubFrame f(sasm, "handle_exception", dont_gc_arguments);
957 oop_maps = generate_handle_exception(id, sasm);
958 }
959 break;
960
961 case handle_exception_from_callee_id:
962 { StubFrame f(sasm, "handle_exception_from_callee", dont_gc_arguments);
963 oop_maps = generate_handle_exception(id, sasm);
964 }
965 break;
966
967 case throw_index_exception_id:
968 { StubFrame f(sasm, "index_range_check_failed", dont_gc_arguments, does_not_return);
969 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_index_exception), true);
970 }
971 break;
972
973 case throw_array_store_exception_id:
974 { StubFrame f(sasm, "throw_array_store_exception", dont_gc_arguments, does_not_return);
975 // tos + 0: link
976 // + 1: return address
977 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_array_store_exception), true);
978 }
979 break;
980
981 case predicate_failed_trap_id:
982 {
983 StubFrame f(sasm, "predicate_failed_trap", dont_gc_arguments, does_not_return);
984
985 OopMap* map = save_live_registers(sasm);
986
987 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, predicate_failed_trap));
988 oop_maps = new OopMapSet();
989 oop_maps->add_gc_map(call_offset, map);
990 restore_live_registers(sasm);
991 __ leave();
992 DeoptimizationBlob* deopt_blob = SharedRuntime::deopt_blob();
993 assert(deopt_blob != nullptr, "deoptimization blob must have been created");
994
995 __ far_jump(RuntimeAddress(deopt_blob->unpack_with_reexecution()));
996 }
997 break;
998
999 case dtrace_object_alloc_id:
1000 { // c_rarg0: object
1001 StubFrame f(sasm, "dtrace_object_alloc", dont_gc_arguments);
1002 save_live_registers(sasm);
1003
1004 __ call_VM_leaf(CAST_FROM_FN_PTR(address, static_cast<int (*)(oopDesc*)>(SharedRuntime::dtrace_object_alloc)), c_rarg0);
1005
1006 restore_live_registers(sasm);
1007 }
1008 break;
1009
1010 default:
1011 { StubFrame f(sasm, "unimplemented entry", dont_gc_arguments, does_not_return);
1012 __ mov(r0, (int)id);
1013 __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, unimplemented_entry), r0);
1014 }
1015 break;
1016 }
1017 }
1018 return oop_maps;
1019 }
1020
1021 #undef __
1022
1023 const char *Runtime1::pd_name_for_address(address entry) { Unimplemented(); return 0; }