1 /*
2 * Copyright (c) 1999, 2022, 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
292 return generate_oop_map(sasm, save_fpu_registers);
293 }
294
295 static void restore_live_registers(StubAssembler* sasm, bool restore_fpu_registers = true) {
296 if (restore_fpu_registers) {
297 for (int i = 0; i < 32; i += 4)
298 __ ld1(as_FloatRegister(i), as_FloatRegister(i+1), as_FloatRegister(i+2),
299 as_FloatRegister(i+3), __ T1D, Address(__ post(sp, 4 * wordSize)));
300 } else {
301 __ add(sp, sp, 32 * wordSize);
302 }
303
304 __ pop(RegSet::range(r0, r29), sp);
305 }
306
307 static void restore_live_registers_except_r0(StubAssembler* sasm, bool restore_fpu_registers = true) {
308
309 if (restore_fpu_registers) {
310 for (int i = 0; i < 32; i += 4)
311 __ ld1(as_FloatRegister(i), as_FloatRegister(i+1), as_FloatRegister(i+2),
312 as_FloatRegister(i+3), __ T1D, Address(__ post(sp, 4 * wordSize)));
313 } else {
314 __ add(sp, sp, 32 * wordSize);
315 }
316
317 __ ldp(zr, r1, Address(__ post(sp, 16)));
318 __ pop(RegSet::range(r2, r29), sp);
319 }
320
321
322
323 void Runtime1::initialize_pd() {
324 int i;
325 int sp_offset = 0;
326
327 // all float registers are saved explicitly
328 assert(FrameMap::nof_fpu_regs == 32, "double registers not handled here");
329 for (i = 0; i < FrameMap::nof_fpu_regs; i++) {
330 fpu_reg_save_offsets[i] = sp_offset;
331 sp_offset += 2; // SP offsets are in halfwords
332 }
333
334 for (i = 0; i < FrameMap::nof_cpu_regs; i++) {
335 Register r = as_Register(i);
336 cpu_reg_save_offsets[i] = sp_offset;
337 sp_offset += 2; // SP offsets are in halfwords
338 }
339 }
340
341
342 // target: the entry point of the method that creates and posts the exception oop
343 // has_argument: true if the exception needs arguments (passed in rscratch1 and rscratch2)
344
345 OopMapSet* Runtime1::generate_exception_throw(StubAssembler* sasm, address target, bool has_argument) {
346 // make a frame and preserve the caller's caller-save registers
347 OopMap* oop_map = save_live_registers(sasm);
348 int call_offset;
349 if (!has_argument) {
350 call_offset = __ call_RT(noreg, noreg, target);
351 } else {
352 __ mov(c_rarg1, rscratch1);
353 __ mov(c_rarg2, rscratch2);
354 call_offset = __ call_RT(noreg, noreg, target);
355 }
356 OopMapSet* oop_maps = new OopMapSet();
357 oop_maps->add_gc_map(call_offset, oop_map);
358 return oop_maps;
359 }
360
361
362 OopMapSet* Runtime1::generate_handle_exception(StubID id, StubAssembler *sasm) {
363 __ block_comment("generate_handle_exception");
364
365 // incoming parameters
366 const Register exception_oop = r0;
367 const Register exception_pc = r3;
368 // other registers used in this stub
369
370 // Save registers, if required.
371 OopMapSet* oop_maps = new OopMapSet();
372 OopMap* oop_map = NULL;
373 switch (id) {
374 case forward_exception_id:
375 // We're handling an exception in the context of a compiled frame.
376 // The registers have been saved in the standard places. Perform
377 // an exception lookup in the caller and dispatch to the handler
378 // if found. Otherwise unwind and dispatch to the callers
379 // exception handler.
380 oop_map = generate_oop_map(sasm, 1 /*thread*/);
381
382 // load and clear pending exception oop into r0
383 __ ldr(exception_oop, Address(rthread, Thread::pending_exception_offset()));
384 __ str(zr, Address(rthread, Thread::pending_exception_offset()));
385
386 // load issuing PC (the return address for this stub) into r3
387 __ ldr(exception_pc, Address(rfp, 1*BytesPerWord));
388 __ authenticate_return_address(exception_pc, rscratch1);
389
390 // make sure that the vm_results are cleared (may be unnecessary)
391 __ str(zr, Address(rthread, JavaThread::vm_result_offset()));
392 __ str(zr, Address(rthread, JavaThread::vm_result_2_offset()));
393 break;
394 case handle_exception_nofpu_id:
395 case handle_exception_id:
396 // At this point all registers MAY be live.
397 oop_map = save_live_registers(sasm, id != handle_exception_nofpu_id);
398 break;
399 case handle_exception_from_callee_id: {
400 // At this point all registers except exception oop (r0) and
401 // exception pc (lr) are dead.
402 const int frame_size = 2 /*fp, return address*/;
403 oop_map = new OopMap(frame_size * VMRegImpl::slots_per_word, 0);
404 sasm->set_frame_size(frame_size);
405 break;
406 }
407 default: ShouldNotReachHere();
408 }
409
410 // verify that only r0 and r3 are valid at this time
411 __ invalidate_registers(false, true, true, false, true, true);
412 // verify that r0 contains a valid exception
413 __ verify_not_null_oop(exception_oop);
414
415 #ifdef ASSERT
416 // check that fields in JavaThread for exception oop and issuing pc are
417 // empty before writing to them
418 Label oop_empty;
419 __ ldr(rscratch1, Address(rthread, JavaThread::exception_oop_offset()));
420 __ cbz(rscratch1, oop_empty);
421 __ stop("exception oop already set");
422 __ bind(oop_empty);
423
424 Label pc_empty;
425 __ ldr(rscratch1, Address(rthread, JavaThread::exception_pc_offset()));
426 __ cbz(rscratch1, pc_empty);
427 __ stop("exception pc already set");
428 __ bind(pc_empty);
429 #endif
430
431 // save exception oop and issuing pc into JavaThread
432 // (exception handler will load it from here)
433 __ str(exception_oop, Address(rthread, JavaThread::exception_oop_offset()));
434 __ str(exception_pc, Address(rthread, JavaThread::exception_pc_offset()));
435
436 // patch throwing pc into return address (has bci & oop map)
437 __ protect_return_address(exception_pc, rscratch1);
438 __ str(exception_pc, Address(rfp, 1*BytesPerWord));
439
440 // compute the exception handler.
441 // the exception oop and the throwing pc are read from the fields in JavaThread
442 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, exception_handler_for_pc));
443 oop_maps->add_gc_map(call_offset, oop_map);
444
445 // r0: handler address
446 // will be the deopt blob if nmethod was deoptimized while we looked up
447 // handler regardless of whether handler existed in the nmethod.
448
449 // only r0 is valid at this time, all other registers have been destroyed by the runtime call
450 __ invalidate_registers(false, true, true, true, true, true);
451
452 // patch the return address, this stub will directly return to the exception handler
453 __ protect_return_address(r0, rscratch1);
454 __ str(r0, Address(rfp, 1*BytesPerWord));
455
456 switch (id) {
457 case forward_exception_id:
458 case handle_exception_nofpu_id:
459 case handle_exception_id:
460 // Restore the registers that were saved at the beginning.
461 restore_live_registers(sasm, id != handle_exception_nofpu_id);
462 break;
463 case handle_exception_from_callee_id:
464 break;
465 default: ShouldNotReachHere();
466 }
467
468 return oop_maps;
469 }
470
471
472 void Runtime1::generate_unwind_exception(StubAssembler *sasm) {
473 // incoming parameters
474 const Register exception_oop = r0;
475 // callee-saved copy of exception_oop during runtime call
476 const Register exception_oop_callee_saved = r19;
477 // other registers used in this stub
478 const Register exception_pc = r3;
479 const Register handler_addr = r1;
480
481 // verify that only r0, is valid at this time
482 __ invalidate_registers(false, true, true, true, true, true);
483
484 #ifdef ASSERT
485 // check that fields in JavaThread for exception oop and issuing pc are empty
486 Label oop_empty;
487 __ ldr(rscratch1, Address(rthread, JavaThread::exception_oop_offset()));
488 __ cbz(rscratch1, oop_empty);
489 __ stop("exception oop must be empty");
490 __ bind(oop_empty);
491
492 Label pc_empty;
493 __ ldr(rscratch1, Address(rthread, JavaThread::exception_pc_offset()));
494 __ cbz(rscratch1, pc_empty);
495 __ stop("exception pc must be empty");
496 __ bind(pc_empty);
497 #endif
498
499 // Save our return address because
500 // exception_handler_for_return_address will destroy it. We also
501 // save exception_oop
502 __ mov(r3, lr);
503 __ protect_return_address();
504 __ stp(lr, exception_oop, Address(__ pre(sp, -2 * wordSize)));
505
506 // search the exception handler address of the caller (using the return address)
507 __ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::exception_handler_for_return_address), rthread, r3);
508 // r0: exception handler address of the caller
509
510 // Only R0 is valid at this time; all other registers have been
511 // destroyed by the call.
512 __ invalidate_registers(false, true, true, true, false, true);
513
514 // move result of call into correct register
515 __ mov(handler_addr, r0);
516
517 // get throwing pc (= return address).
518 // lr has been destroyed by the call
519 __ ldp(lr, exception_oop, Address(__ post(sp, 2 * wordSize)));
520 __ authenticate_return_address();
521 __ mov(r3, lr);
522
523 __ verify_not_null_oop(exception_oop);
524
525 // continue at exception handler (return address removed)
526 // note: do *not* remove arguments when unwinding the
527 // activation since the caller assumes having
528 // all arguments on the stack when entering the
529 // runtime to determine the exception handler
530 // (GC happens at call site with arguments!)
531 // r0: exception oop
532 // r3: throwing pc
533 // r1: exception handler
534 __ br(handler_addr);
535 }
536
537
538
539 OopMapSet* Runtime1::generate_patching(StubAssembler* sasm, address target) {
540 // use the maximum number of runtime-arguments here because it is difficult to
541 // distinguish each RT-Call.
542 // Note: This number affects also the RT-Call in generate_handle_exception because
543 // the oop-map is shared for all calls.
544 DeoptimizationBlob* deopt_blob = SharedRuntime::deopt_blob();
545 assert(deopt_blob != NULL, "deoptimization blob must have been created");
546
547 OopMap* oop_map = save_live_registers(sasm);
548
549 __ mov(c_rarg0, rthread);
550 Label retaddr;
551 __ set_last_Java_frame(sp, rfp, retaddr, rscratch1);
552 // do the call
553 __ lea(rscratch1, RuntimeAddress(target));
554 __ blr(rscratch1);
555 __ bind(retaddr);
556 OopMapSet* oop_maps = new OopMapSet();
557 oop_maps->add_gc_map(__ offset(), oop_map);
558 // verify callee-saved register
559 #ifdef ASSERT
560 { Label L;
561 __ get_thread(rscratch1);
562 __ cmp(rthread, rscratch1);
563 __ br(Assembler::EQ, L);
564 __ stop("StubAssembler::call_RT: rthread not callee saved?");
565 __ bind(L);
566 }
567 #endif
568
569 __ reset_last_Java_frame(true);
570
571 #ifdef ASSERT
572 // check that fields in JavaThread for exception oop and issuing pc are empty
573 Label oop_empty;
574 __ ldr(rscratch1, Address(rthread, Thread::pending_exception_offset()));
575 __ cbz(rscratch1, oop_empty);
576 __ stop("exception oop must be empty");
577 __ bind(oop_empty);
578
579 Label pc_empty;
580 __ ldr(rscratch1, Address(rthread, JavaThread::exception_pc_offset()));
581 __ cbz(rscratch1, pc_empty);
582 __ stop("exception pc must be empty");
583 __ bind(pc_empty);
584 #endif
585
586 // Runtime will return true if the nmethod has been deoptimized, this is the
587 // expected scenario and anything else is an error. Note that we maintain a
588 // check on the result purely as a defensive measure.
589 Label no_deopt;
590 __ cbz(r0, no_deopt); // Have we deoptimized?
591
592 // Perform a re-execute. The proper return address is already on the stack,
593 // we just need to restore registers, pop all of our frame but the return
594 // address and jump to the deopt blob.
595 restore_live_registers(sasm);
596 __ leave();
597 __ far_jump(RuntimeAddress(deopt_blob->unpack_with_reexecution()));
598
599 __ bind(no_deopt);
600 __ stop("deopt not performed");
601
602 return oop_maps;
603 }
604
605
606 OopMapSet* Runtime1::generate_code_for(StubID id, StubAssembler* sasm) {
607
608 const Register exception_oop = r0;
609 const Register exception_pc = r3;
610
611 // for better readability
612 const bool must_gc_arguments = true;
613 const bool dont_gc_arguments = false;
614
615 // default value; overwritten for some optimized stubs that are called from methods that do not use the fpu
616 bool save_fpu_registers = true;
617
618 // stub code & info for the different stubs
619 OopMapSet* oop_maps = NULL;
620 OopMap* oop_map = NULL;
621 switch (id) {
622 {
623 case forward_exception_id:
624 {
625 oop_maps = generate_handle_exception(id, sasm);
626 __ leave();
627 __ ret(lr);
628 }
629 break;
630
631 case throw_div0_exception_id:
632 { StubFrame f(sasm, "throw_div0_exception", dont_gc_arguments, does_not_return);
633 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_div0_exception), false);
634 }
635 break;
636
637 case throw_null_pointer_exception_id:
638 { StubFrame f(sasm, "throw_null_pointer_exception", dont_gc_arguments, does_not_return);
639 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_null_pointer_exception), false);
640 }
641 break;
642
643 case new_instance_id:
644 case new_instance_no_inline_id:
645 case fast_new_instance_id:
646 case fast_new_instance_init_check_id:
647 {
648 Register klass = r3; // Incoming
649 Register obj = r0; // Result
650
651 if (id == new_instance_id) {
652 __ set_info("new_instance", dont_gc_arguments);
653 } else if (id == new_instance_no_inline_id) {
654 __ set_info("new_instance_no_inline", dont_gc_arguments);
655 } else if (id == fast_new_instance_id) {
656 __ set_info("fast new_instance", dont_gc_arguments);
657 } else {
658 assert(id == fast_new_instance_init_check_id, "bad StubID");
659 __ set_info("fast new_instance init check", dont_gc_arguments);
660 }
661
662 __ enter();
663 OopMap* map = save_live_registers(sasm);
664 int call_offset;
665 if (id == new_instance_no_inline_id) {
666 call_offset = __ call_RT(obj, noreg, CAST_FROM_FN_PTR(address, new_instance_no_inline), klass);
667 } else {
668 call_offset = __ call_RT(obj, noreg, CAST_FROM_FN_PTR(address, new_instance), klass);
669 }
670 oop_maps = new OopMapSet();
671 oop_maps->add_gc_map(call_offset, map);
672 restore_live_registers_except_r0(sasm);
673 __ verify_oop(obj);
674 __ leave();
675 __ ret(lr);
676
677 // r0,: new instance
678 }
679
680 break;
681
682 case counter_overflow_id:
683 {
684 Register bci = r0, method = r1;
685 __ enter();
686 OopMap* map = save_live_registers(sasm);
687 // Retrieve bci
688 __ ldrw(bci, Address(rfp, 2*BytesPerWord));
689 // And a pointer to the Method*
690 __ ldr(method, Address(rfp, 3*BytesPerWord));
691 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, counter_overflow), bci, method);
692 oop_maps = new OopMapSet();
693 oop_maps->add_gc_map(call_offset, map);
694 restore_live_registers(sasm);
695 __ leave();
696 __ ret(lr);
697 }
698 break;
699
700 case new_type_array_id:
701 case new_object_array_id:
702 case new_flat_array_id:
703 {
704 Register length = r19; // Incoming
705 Register klass = r3; // Incoming
706 Register obj = r0; // Result
707
708 if (id == new_type_array_id) {
709 __ set_info("new_type_array", dont_gc_arguments);
710 } else if (id == new_object_array_id) {
711 __ set_info("new_object_array", dont_gc_arguments);
712 } else {
713 __ set_info("new_flat_array", dont_gc_arguments);
714 }
715
716 #ifdef ASSERT
717 // assert object type is really an array of the proper kind
718 {
719 Label ok;
720 Register t0 = obj;
721 __ ldrw(t0, Address(klass, Klass::layout_helper_offset()));
722 __ asrw(t0, t0, Klass::_lh_array_tag_shift);
723 switch (id) {
724 case new_type_array_id:
725 __ cmpw(t0, Klass::_lh_array_tag_type_value);
726 __ br(Assembler::EQ, ok);
727 __ stop("assert(is a type array klass)");
728 break;
729 case new_object_array_id:
730 __ cmpw(t0, Klass::_lh_array_tag_obj_value); // new "[Ljava/lang/Object;"
731 __ br(Assembler::EQ, ok);
732 __ cmpw(t0, Klass::_lh_array_tag_vt_value); // new "[LVT;"
733 __ br(Assembler::EQ, ok);
734 __ stop("assert(is an object or inline type array klass)");
735 break;
736 case new_flat_array_id:
737 // new "[QVT;"
738 __ cmpw(t0, Klass::_lh_array_tag_vt_value); // the array can be flattened.
739 __ br(Assembler::EQ, ok);
740 __ cmpw(t0, Klass::_lh_array_tag_obj_value); // the array cannot be flattened (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_flat_array_id, "must be");
760 call_offset = __ call_RT(obj, noreg, CAST_FROM_FN_PTR(address, new_flat_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_flattened_array_id:
821 {
822 StubFrame f(sasm, "load_flattened_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_flattened_array), r0, r1);
830
831 oop_maps = new OopMapSet();
832 oop_maps->add_gc_map(call_offset, map);
833 restore_live_registers_except_r0(sasm);
834
835 // r0: loaded element at array[index]
836 __ verify_oop(r0);
837 }
838 break;
839
840 case store_flattened_array_id:
841 {
842 StubFrame f(sasm, "store_flattened_array", dont_gc_arguments);
843 OopMap* map = save_live_registers(sasm, 4);
844
845 // Called with store_parameter and not C abi
846
847 f.load_argument(2, r0); // r0: array
848 f.load_argument(1, r1); // r1: index
849 f.load_argument(0, r2); // r2: value
850 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, store_flattened_array), r0, r1, r2);
851
852 oop_maps = new OopMapSet();
853 oop_maps->add_gc_map(call_offset, map);
854 restore_live_registers_except_r0(sasm);
855 }
856 break;
857
858 case substitutability_check_id:
859 {
860 StubFrame f(sasm, "substitutability_check", dont_gc_arguments);
861 OopMap* map = save_live_registers(sasm);
862
863 // Called with store_parameter and not C abi
864
865 f.load_argument(1, r1); // r1,: left
866 f.load_argument(0, r2); // r2,: right
867 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, substitutability_check), r1, r2);
868
869 oop_maps = new OopMapSet();
870 oop_maps->add_gc_map(call_offset, map);
871 restore_live_registers_except_r0(sasm);
872
873 // r0,: are the two operands substitutable
874 }
875 break;
876
877 case register_finalizer_id:
878 {
879 __ set_info("register_finalizer", dont_gc_arguments);
880
881 // This is called via call_runtime so the arguments
882 // will be place in C abi locations
883
884 __ verify_oop(c_rarg0);
885
886 // load the klass and check the has finalizer flag
887 Label register_finalizer;
888 Register t = r5;
889 __ load_klass(t, r0);
890 __ ldrw(t, Address(t, Klass::access_flags_offset()));
891 __ tbnz(t, exact_log2(JVM_ACC_HAS_FINALIZER), register_finalizer);
892 __ ret(lr);
893
894 __ bind(register_finalizer);
895 __ enter();
896 OopMap* oop_map = save_live_registers(sasm);
897 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, SharedRuntime::register_finalizer), r0);
898 oop_maps = new OopMapSet();
899 oop_maps->add_gc_map(call_offset, oop_map);
900
901 // Now restore all the live registers
902 restore_live_registers(sasm);
903
904 __ leave();
905 __ ret(lr);
906 }
907 break;
908
909 case throw_class_cast_exception_id:
910 { StubFrame f(sasm, "throw_class_cast_exception", dont_gc_arguments, does_not_return);
911 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_class_cast_exception), true);
912 }
913 break;
914
915 case throw_incompatible_class_change_error_id:
916 { StubFrame f(sasm, "throw_incompatible_class_change_error", dont_gc_arguments, does_not_return);
917 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_incompatible_class_change_error), false);
918 }
919 break;
920
921 case throw_illegal_monitor_state_exception_id:
922 { StubFrame f(sasm, "throw_illegal_monitor_state_exception", dont_gc_arguments);
923 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_illegal_monitor_state_exception), false);
924 }
925 break;
926
927 case slow_subtype_check_id:
928 {
929 // Typical calling sequence:
930 // __ push(klass_RInfo); // object klass or other subclass
931 // __ push(sup_k_RInfo); // array element klass or other superclass
932 // __ bl(slow_subtype_check);
933 // Note that the subclass is pushed first, and is therefore deepest.
934 enum layout {
935 r0_off, r0_off_hi,
936 r2_off, r2_off_hi,
937 r4_off, r4_off_hi,
938 r5_off, r5_off_hi,
939 sup_k_off, sup_k_off_hi,
940 klass_off, klass_off_hi,
941 framesize,
942 result_off = sup_k_off
943 };
944
945 __ set_info("slow_subtype_check", dont_gc_arguments);
946 __ push(RegSet::of(r0, r2, r4, r5), sp);
947
948 // This is called by pushing args and not with C abi
949 // __ ldr(r4, Address(sp, (klass_off) * VMRegImpl::stack_slot_size)); // subclass
950 // __ ldr(r0, Address(sp, (sup_k_off) * VMRegImpl::stack_slot_size)); // superclass
951
952 __ ldp(r4, r0, Address(sp, (sup_k_off) * VMRegImpl::stack_slot_size));
953
954 Label miss;
955 __ check_klass_subtype_slow_path(r4, r0, r2, r5, NULL, &miss);
956
957 // fallthrough on success:
958 __ mov(rscratch1, 1);
959 __ str(rscratch1, Address(sp, (result_off) * VMRegImpl::stack_slot_size)); // result
960 __ pop(RegSet::of(r0, r2, r4, r5), sp);
961 __ ret(lr);
962
963 __ bind(miss);
964 __ str(zr, Address(sp, (result_off) * VMRegImpl::stack_slot_size)); // result
965 __ pop(RegSet::of(r0, r2, r4, r5), sp);
966 __ ret(lr);
967 }
968 break;
969
970 case monitorenter_nofpu_id:
971 save_fpu_registers = false;
972 // fall through
973 case monitorenter_id:
974 {
975 StubFrame f(sasm, "monitorenter", dont_gc_arguments);
976 OopMap* map = save_live_registers(sasm, save_fpu_registers);
977
978 // Called with store_parameter and not C abi
979
980 f.load_argument(1, r0); // r0,: object
981 f.load_argument(0, r1); // r1,: lock address
982
983 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, monitorenter), r0, r1);
984
985 oop_maps = new OopMapSet();
986 oop_maps->add_gc_map(call_offset, map);
987 restore_live_registers(sasm, save_fpu_registers);
988 }
989 break;
990
991 case monitorexit_nofpu_id:
992 save_fpu_registers = false;
993 // fall through
994 case monitorexit_id:
995 {
996 StubFrame f(sasm, "monitorexit", dont_gc_arguments);
997 OopMap* map = save_live_registers(sasm, save_fpu_registers);
998
999 // Called with store_parameter and not C abi
1000
1001 f.load_argument(0, r0); // r0,: lock address
1002
1003 // note: really a leaf routine but must setup last java sp
1004 // => use call_RT for now (speed can be improved by
1005 // doing last java sp setup manually)
1006 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, monitorexit), r0);
1007
1008 oop_maps = new OopMapSet();
1009 oop_maps->add_gc_map(call_offset, map);
1010 restore_live_registers(sasm, save_fpu_registers);
1011 }
1012 break;
1013
1014 case deoptimize_id:
1015 {
1016 StubFrame f(sasm, "deoptimize", dont_gc_arguments, does_not_return);
1017 OopMap* oop_map = save_live_registers(sasm);
1018 f.load_argument(0, c_rarg1);
1019 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, deoptimize), c_rarg1);
1020
1021 oop_maps = new OopMapSet();
1022 oop_maps->add_gc_map(call_offset, oop_map);
1023 restore_live_registers(sasm);
1024 DeoptimizationBlob* deopt_blob = SharedRuntime::deopt_blob();
1025 assert(deopt_blob != NULL, "deoptimization blob must have been created");
1026 __ leave();
1027 __ far_jump(RuntimeAddress(deopt_blob->unpack_with_reexecution()));
1028 }
1029 break;
1030
1031 case throw_range_check_failed_id:
1032 { StubFrame f(sasm, "range_check_failed", dont_gc_arguments, does_not_return);
1033 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_range_check_exception), true);
1034 }
1035 break;
1036
1037 case unwind_exception_id:
1038 { __ set_info("unwind_exception", dont_gc_arguments);
1039 // note: no stubframe since we are about to leave the current
1040 // activation and we are calling a leaf VM function only.
1041 generate_unwind_exception(sasm);
1042 }
1043 break;
1044
1045 case access_field_patching_id:
1046 { StubFrame f(sasm, "access_field_patching", dont_gc_arguments, does_not_return);
1047 // we should set up register map
1048 oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, access_field_patching));
1049 }
1050 break;
1051
1052 case load_klass_patching_id:
1053 { StubFrame f(sasm, "load_klass_patching", dont_gc_arguments, does_not_return);
1054 // we should set up register map
1055 oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, move_klass_patching));
1056 }
1057 break;
1058
1059 case load_mirror_patching_id:
1060 { StubFrame f(sasm, "load_mirror_patching", dont_gc_arguments, does_not_return);
1061 // we should set up register map
1062 oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, move_mirror_patching));
1063 }
1064 break;
1065
1066 case load_appendix_patching_id:
1067 { StubFrame f(sasm, "load_appendix_patching", dont_gc_arguments, does_not_return);
1068 // we should set up register map
1069 oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, move_appendix_patching));
1070 }
1071 break;
1072
1073 case handle_exception_nofpu_id:
1074 case handle_exception_id:
1075 { StubFrame f(sasm, "handle_exception", dont_gc_arguments);
1076 oop_maps = generate_handle_exception(id, sasm);
1077 }
1078 break;
1079
1080 case handle_exception_from_callee_id:
1081 { StubFrame f(sasm, "handle_exception_from_callee", dont_gc_arguments);
1082 oop_maps = generate_handle_exception(id, sasm);
1083 }
1084 break;
1085
1086 case throw_index_exception_id:
1087 { StubFrame f(sasm, "index_range_check_failed", dont_gc_arguments, does_not_return);
1088 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_index_exception), true);
1089 }
1090 break;
1091
1092 case throw_array_store_exception_id:
1093 { StubFrame f(sasm, "throw_array_store_exception", dont_gc_arguments, does_not_return);
1094 // tos + 0: link
1095 // + 1: return address
1096 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_array_store_exception), true);
1097 }
1098 break;
1099
1100 case predicate_failed_trap_id:
1101 {
1102 StubFrame f(sasm, "predicate_failed_trap", dont_gc_arguments, does_not_return);
1103
1104 OopMap* map = save_live_registers(sasm);
1105
1106 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, predicate_failed_trap));
1107 oop_maps = new OopMapSet();
1108 oop_maps->add_gc_map(call_offset, map);
1109 restore_live_registers(sasm);
1110 __ leave();
1111 DeoptimizationBlob* deopt_blob = SharedRuntime::deopt_blob();
1112 assert(deopt_blob != NULL, "deoptimization blob must have been created");
1113
1114 __ far_jump(RuntimeAddress(deopt_blob->unpack_with_reexecution()));
1115 }
1116 break;
1117
1118 case dtrace_object_alloc_id:
1119 { // c_rarg0: object
1120 StubFrame f(sasm, "dtrace_object_alloc", dont_gc_arguments);
1121 save_live_registers(sasm);
1122
1123 __ call_VM_leaf(CAST_FROM_FN_PTR(address, static_cast<int (*)(oopDesc*)>(SharedRuntime::dtrace_object_alloc)), c_rarg0);
1124
1125 restore_live_registers(sasm);
1126 }
1127 break;
1128
1129 default:
1130 // FIXME: For unhandled trap_id this code fails with assert during vm intialization
1131 // rather than insert a call to unimplemented_entry
1132 { StubFrame f(sasm, "unimplemented entry", dont_gc_arguments, does_not_return);
1133 __ mov(r0, (int)id);
1134 __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, unimplemented_entry), r0);
1135 }
1136 break;
1137 }
1138 }
1139
1140
1141 return oop_maps;
1142 }
1143
1144 #undef __
1145
1146 const char *Runtime1::pd_name_for_address(address entry) { Unimplemented(); return 0; }