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 void save_live_registers_no_oop_map(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
293 static OopMap* save_live_registers(StubAssembler* sasm,
294 bool save_fpu_registers = true) {
295 save_live_registers_no_oop_map(sasm, save_fpu_registers);
296 return generate_oop_map(sasm, save_fpu_registers);
297 }
298
299 static void restore_live_registers(StubAssembler* sasm, bool restore_fpu_registers = true) {
300 if (restore_fpu_registers) {
301 for (int i = 0; i < 32; i += 4)
302 __ ld1(as_FloatRegister(i), as_FloatRegister(i+1), as_FloatRegister(i+2),
303 as_FloatRegister(i+3), __ T1D, Address(__ post(sp, 4 * wordSize)));
304 } else {
305 __ add(sp, sp, 32 * wordSize);
306 }
307
308 __ pop(RegSet::range(r0, r29), sp);
309 }
310
311 static void restore_live_registers_except_r0(StubAssembler* sasm, bool restore_fpu_registers = true) {
312
313 if (restore_fpu_registers) {
314 for (int i = 0; i < 32; i += 4)
315 __ ld1(as_FloatRegister(i), as_FloatRegister(i+1), as_FloatRegister(i+2),
316 as_FloatRegister(i+3), __ T1D, Address(__ post(sp, 4 * wordSize)));
317 } else {
318 __ add(sp, sp, 32 * wordSize);
319 }
320
321 __ ldp(zr, r1, Address(__ post(sp, 16)));
322 __ pop(RegSet::range(r2, r29), sp);
323 }
324
325
326
327 void Runtime1::initialize_pd() {
328 int i;
329 int sp_offset = 0;
330
331 // all float registers are saved explicitly
332 assert(FrameMap::nof_fpu_regs == 32, "double registers not handled here");
333 for (i = 0; i < FrameMap::nof_fpu_regs; i++) {
334 fpu_reg_save_offsets[i] = sp_offset;
335 sp_offset += 2; // SP offsets are in halfwords
336 }
337
338 for (i = 0; i < FrameMap::nof_cpu_regs; i++) {
339 Register r = as_Register(i);
340 cpu_reg_save_offsets[i] = sp_offset;
341 sp_offset += 2; // SP offsets are in halfwords
342 }
343 }
344
345
346 // target: the entry point of the method that creates and posts the exception oop
347 // has_argument: true if the exception needs arguments (passed in rscratch1 and rscratch2)
348
349 OopMapSet* Runtime1::generate_exception_throw(StubAssembler* sasm, address target, bool has_argument) {
350 // make a frame and preserve the caller's caller-save registers
351 OopMap* oop_map = save_live_registers(sasm);
352 int call_offset;
353 if (!has_argument) {
354 call_offset = __ call_RT(noreg, noreg, target);
355 } else {
356 __ mov(c_rarg1, rscratch1);
357 __ mov(c_rarg2, rscratch2);
358 call_offset = __ call_RT(noreg, noreg, target);
359 }
360 OopMapSet* oop_maps = new OopMapSet();
361 oop_maps->add_gc_map(call_offset, oop_map);
362 return oop_maps;
363 }
364
365
366 OopMapSet* Runtime1::generate_handle_exception(StubID id, StubAssembler *sasm) {
367 __ block_comment("generate_handle_exception");
368
369 // incoming parameters
370 const Register exception_oop = r0;
371 const Register exception_pc = r3;
372 // other registers used in this stub
373
374 // Save registers, if required.
375 OopMapSet* oop_maps = new OopMapSet();
376 OopMap* oop_map = NULL;
377 switch (id) {
378 case forward_exception_id:
379 // We're handling an exception in the context of a compiled frame.
380 // The registers have been saved in the standard places. Perform
381 // an exception lookup in the caller and dispatch to the handler
382 // if found. Otherwise unwind and dispatch to the callers
383 // exception handler.
384 oop_map = generate_oop_map(sasm, 1 /*thread*/);
385
386 // load and clear pending exception oop into r0
387 __ ldr(exception_oop, Address(rthread, Thread::pending_exception_offset()));
388 __ str(zr, Address(rthread, Thread::pending_exception_offset()));
389
390 // load issuing PC (the return address for this stub) into r3
391 __ ldr(exception_pc, Address(rfp, 1*BytesPerWord));
392 __ authenticate_return_address(exception_pc, rscratch1);
393
394 // make sure that the vm_results are cleared (may be unnecessary)
395 __ str(zr, Address(rthread, JavaThread::vm_result_offset()));
396 __ str(zr, Address(rthread, JavaThread::vm_result_2_offset()));
397 break;
398 case handle_exception_nofpu_id:
399 case handle_exception_id:
400 // At this point all registers MAY be live.
401 oop_map = save_live_registers(sasm, id != handle_exception_nofpu_id);
402 break;
403 case handle_exception_from_callee_id: {
404 // At this point all registers except exception oop (r0) and
405 // exception pc (lr) are dead.
406 const int frame_size = 2 /*fp, return address*/;
407 oop_map = new OopMap(frame_size * VMRegImpl::slots_per_word, 0);
408 sasm->set_frame_size(frame_size);
409 break;
410 }
411 default: ShouldNotReachHere();
412 }
413
414 // verify that only r0 and r3 are valid at this time
415 __ invalidate_registers(false, true, true, false, true, true);
416 // verify that r0 contains a valid exception
417 __ verify_not_null_oop(exception_oop);
418
419 #ifdef ASSERT
420 // check that fields in JavaThread for exception oop and issuing pc are
421 // empty before writing to them
422 Label oop_empty;
423 __ ldr(rscratch1, Address(rthread, JavaThread::exception_oop_offset()));
424 __ cbz(rscratch1, oop_empty);
425 __ stop("exception oop already set");
426 __ bind(oop_empty);
427
428 Label pc_empty;
429 __ ldr(rscratch1, Address(rthread, JavaThread::exception_pc_offset()));
430 __ cbz(rscratch1, pc_empty);
431 __ stop("exception pc already set");
432 __ bind(pc_empty);
433 #endif
434
435 // save exception oop and issuing pc into JavaThread
436 // (exception handler will load it from here)
437 __ str(exception_oop, Address(rthread, JavaThread::exception_oop_offset()));
438 __ str(exception_pc, Address(rthread, JavaThread::exception_pc_offset()));
439
440 // patch throwing pc into return address (has bci & oop map)
441 __ protect_return_address(exception_pc, rscratch1);
442 __ str(exception_pc, Address(rfp, 1*BytesPerWord));
443
444 // compute the exception handler.
445 // the exception oop and the throwing pc are read from the fields in JavaThread
446 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, exception_handler_for_pc));
447 oop_maps->add_gc_map(call_offset, oop_map);
448
449 // r0: handler address
450 // will be the deopt blob if nmethod was deoptimized while we looked up
451 // handler regardless of whether handler existed in the nmethod.
452
453 // only r0 is valid at this time, all other registers have been destroyed by the runtime call
454 __ invalidate_registers(false, true, true, true, true, true);
455
456 // patch the return address, this stub will directly return to the exception handler
457 __ protect_return_address(r0, rscratch1);
458 __ str(r0, Address(rfp, 1*BytesPerWord));
459
460 switch (id) {
461 case forward_exception_id:
462 case handle_exception_nofpu_id:
463 case handle_exception_id:
464 // Restore the registers that were saved at the beginning.
465 restore_live_registers(sasm, id != handle_exception_nofpu_id);
466 break;
467 case handle_exception_from_callee_id:
468 break;
469 default: ShouldNotReachHere();
470 }
471
472 return oop_maps;
473 }
474
475
476 void Runtime1::generate_unwind_exception(StubAssembler *sasm) {
477 // incoming parameters
478 const Register exception_oop = r0;
479 // callee-saved copy of exception_oop during runtime call
480 const Register exception_oop_callee_saved = r19;
481 // other registers used in this stub
482 const Register exception_pc = r3;
483 const Register handler_addr = r1;
484
485 // verify that only r0, is valid at this time
486 __ invalidate_registers(false, true, true, true, true, true);
487
488 #ifdef ASSERT
489 // check that fields in JavaThread for exception oop and issuing pc are empty
490 Label oop_empty;
491 __ ldr(rscratch1, Address(rthread, JavaThread::exception_oop_offset()));
492 __ cbz(rscratch1, oop_empty);
493 __ stop("exception oop must be empty");
494 __ bind(oop_empty);
495
496 Label pc_empty;
497 __ ldr(rscratch1, Address(rthread, JavaThread::exception_pc_offset()));
498 __ cbz(rscratch1, pc_empty);
499 __ stop("exception pc must be empty");
500 __ bind(pc_empty);
501 #endif
502
503 // Save our return address because
504 // exception_handler_for_return_address will destroy it. We also
505 // save exception_oop
506 __ mov(r3, lr);
507 __ protect_return_address();
508 __ stp(lr, exception_oop, Address(__ pre(sp, -2 * wordSize)));
509
510 // search the exception handler address of the caller (using the return address)
511 __ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::exception_handler_for_return_address), rthread, r3);
512 // r0: exception handler address of the caller
513
514 // Only R0 is valid at this time; all other registers have been
515 // destroyed by the call.
516 __ invalidate_registers(false, true, true, true, false, true);
517
518 // move result of call into correct register
519 __ mov(handler_addr, r0);
520
521 // get throwing pc (= return address).
522 // lr has been destroyed by the call
523 __ ldp(lr, exception_oop, Address(__ post(sp, 2 * wordSize)));
524 __ authenticate_return_address();
525 __ mov(r3, lr);
526
527 __ verify_not_null_oop(exception_oop);
528
529 // continue at exception handler (return address removed)
530 // note: do *not* remove arguments when unwinding the
531 // activation since the caller assumes having
532 // all arguments on the stack when entering the
533 // runtime to determine the exception handler
534 // (GC happens at call site with arguments!)
535 // r0: exception oop
536 // r3: throwing pc
537 // r1: exception handler
538 __ br(handler_addr);
539 }
540
541
542
543 OopMapSet* Runtime1::generate_patching(StubAssembler* sasm, address target) {
544 // use the maximum number of runtime-arguments here because it is difficult to
545 // distinguish each RT-Call.
546 // Note: This number affects also the RT-Call in generate_handle_exception because
547 // the oop-map is shared for all calls.
548 DeoptimizationBlob* deopt_blob = SharedRuntime::deopt_blob();
549 assert(deopt_blob != NULL, "deoptimization blob must have been created");
550
551 OopMap* oop_map = save_live_registers(sasm);
552
553 __ mov(c_rarg0, rthread);
554 Label retaddr;
555 __ set_last_Java_frame(sp, rfp, retaddr, rscratch1);
556 // do the call
557 __ lea(rscratch1, RuntimeAddress(target));
558 __ blr(rscratch1);
559 __ bind(retaddr);
560 OopMapSet* oop_maps = new OopMapSet();
561 oop_maps->add_gc_map(__ offset(), oop_map);
562 // verify callee-saved register
563 #ifdef ASSERT
564 { Label L;
565 __ get_thread(rscratch1);
566 __ cmp(rthread, rscratch1);
567 __ br(Assembler::EQ, L);
568 __ stop("StubAssembler::call_RT: rthread not callee saved?");
569 __ bind(L);
570 }
571 #endif
572
573 __ reset_last_Java_frame(true);
574
575 #ifdef ASSERT
576 // check that fields in JavaThread for exception oop and issuing pc are empty
577 Label oop_empty;
578 __ ldr(rscratch1, Address(rthread, Thread::pending_exception_offset()));
579 __ cbz(rscratch1, oop_empty);
580 __ stop("exception oop must be empty");
581 __ bind(oop_empty);
582
583 Label pc_empty;
584 __ ldr(rscratch1, Address(rthread, JavaThread::exception_pc_offset()));
585 __ cbz(rscratch1, pc_empty);
586 __ stop("exception pc must be empty");
587 __ bind(pc_empty);
588 #endif
589
590 // Runtime will return true if the nmethod has been deoptimized, this is the
591 // expected scenario and anything else is an error. Note that we maintain a
592 // check on the result purely as a defensive measure.
593 Label no_deopt;
594 __ cbz(r0, no_deopt); // Have we deoptimized?
595
596 // Perform a re-execute. The proper return address is already on the stack,
597 // we just need to restore registers, pop all of our frame but the return
598 // address and jump to the deopt blob.
599 restore_live_registers(sasm);
600 __ leave();
601 __ far_jump(RuntimeAddress(deopt_blob->unpack_with_reexecution()));
602
603 __ bind(no_deopt);
604 __ stop("deopt not performed");
605
606 return oop_maps;
607 }
608
609
610 OopMapSet* Runtime1::generate_code_for(StubID id, StubAssembler* sasm) {
611
612 const Register exception_oop = r0;
613 const Register exception_pc = r3;
614
615 // for better readability
616 const bool must_gc_arguments = true;
617 const bool dont_gc_arguments = false;
618
619 // default value; overwritten for some optimized stubs that are called from methods that do not use the fpu
620 bool save_fpu_registers = true;
621
622 // stub code & info for the different stubs
623 OopMapSet* oop_maps = NULL;
624 OopMap* oop_map = NULL;
625 switch (id) {
626 {
627 case forward_exception_id:
628 {
629 oop_maps = generate_handle_exception(id, sasm);
630 __ leave();
631 __ ret(lr);
632 }
633 break;
634
635 case throw_div0_exception_id:
636 { StubFrame f(sasm, "throw_div0_exception", dont_gc_arguments, does_not_return);
637 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_div0_exception), false);
638 }
639 break;
640
641 case throw_null_pointer_exception_id:
642 { StubFrame f(sasm, "throw_null_pointer_exception", dont_gc_arguments, does_not_return);
643 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_null_pointer_exception), false);
644 }
645 break;
646
647 case new_instance_id:
648 case fast_new_instance_id:
649 case fast_new_instance_init_check_id:
650 {
651 Register klass = r3; // Incoming
652 Register obj = r0; // Result
653
654 if (id == new_instance_id) {
655 __ set_info("new_instance", dont_gc_arguments);
656 } else if (id == fast_new_instance_id) {
657 __ set_info("fast new_instance", dont_gc_arguments);
658 } else {
659 assert(id == fast_new_instance_init_check_id, "bad StubID");
660 __ set_info("fast new_instance init check", dont_gc_arguments);
661 }
662
663 // If TLAB is disabled, see if there is support for inlining contiguous
664 // allocations.
665 // Otherwise, just go to the slow path.
666 if ((id == fast_new_instance_id || id == fast_new_instance_init_check_id) &&
667 !UseTLAB && Universe::heap()->supports_inline_contig_alloc()) {
668 Label slow_path;
669 Register obj_size = r19;
670 Register t1 = r10;
671 Register t2 = r11;
672 assert_different_registers(klass, obj, obj_size, t1, t2);
673
674 __ stp(r19, zr, Address(__ pre(sp, -2 * wordSize)));
675
676 if (id == fast_new_instance_init_check_id) {
677 // make sure the klass is initialized
678 __ ldrb(rscratch1, Address(klass, InstanceKlass::init_state_offset()));
679 __ cmpw(rscratch1, InstanceKlass::fully_initialized);
680 __ br(Assembler::NE, slow_path);
681 }
682
683 #ifdef ASSERT
684 // assert object can be fast path allocated
685 {
686 Label ok, not_ok;
687 __ ldrw(obj_size, Address(klass, Klass::layout_helper_offset()));
688 __ cmp(obj_size, (u1)0);
689 __ br(Assembler::LE, not_ok); // make sure it's an instance (LH > 0)
690 __ tstw(obj_size, Klass::_lh_instance_slow_path_bit);
691 __ br(Assembler::EQ, ok);
692 __ bind(not_ok);
693 __ stop("assert(can be fast path allocated)");
694 __ should_not_reach_here();
695 __ bind(ok);
696 }
697 #endif // ASSERT
698
699 // get the instance size (size is positive so movl is fine for 64bit)
700 __ ldrw(obj_size, Address(klass, Klass::layout_helper_offset()));
701
702 __ eden_allocate(obj, obj_size, 0, t1, slow_path);
703
704 __ initialize_object(obj, klass, obj_size, 0, t1, t2, /* is_tlab_allocated */ false);
705 __ verify_oop(obj);
706 __ ldp(r19, zr, Address(__ post(sp, 2 * wordSize)));
707 __ ret(lr);
708
709 __ bind(slow_path);
710 __ ldp(r19, zr, Address(__ post(sp, 2 * wordSize)));
711 }
712
713 __ enter();
714 OopMap* map = save_live_registers(sasm);
715 int call_offset = __ call_RT(obj, noreg, CAST_FROM_FN_PTR(address, new_instance), klass);
716 oop_maps = new OopMapSet();
717 oop_maps->add_gc_map(call_offset, map);
718 restore_live_registers_except_r0(sasm);
719 __ verify_oop(obj);
720 __ leave();
721 __ ret(lr);
722
723 // r0,: new instance
724 }
725
726 break;
727
728 case load_klass_id:
729 {
730 StubFrame f(sasm, "load_klass", dont_gc_arguments);
731 save_live_registers_no_oop_map(sasm, true);
732 f.load_argument(0, r0); // obj
733 __ call_VM_leaf(CAST_FROM_FN_PTR(address, oopDesc::load_nklass_runtime), r0);
734 restore_live_registers_except_r0(sasm, true);
735 }
736 break;
737
738 case counter_overflow_id:
739 {
740 Register bci = r0, method = r1;
741 __ enter();
742 OopMap* map = save_live_registers(sasm);
743 // Retrieve bci
744 __ ldrw(bci, Address(rfp, 2*BytesPerWord));
745 // And a pointer to the Method*
746 __ ldr(method, Address(rfp, 3*BytesPerWord));
747 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, counter_overflow), bci, method);
748 oop_maps = new OopMapSet();
749 oop_maps->add_gc_map(call_offset, map);
750 restore_live_registers(sasm);
751 __ leave();
752 __ ret(lr);
753 }
754 break;
755
756 case new_type_array_id:
757 case new_object_array_id:
758 {
759 Register length = r19; // Incoming
760 Register klass = r3; // Incoming
761 Register obj = r0; // Result
762
763 if (id == new_type_array_id) {
764 __ set_info("new_type_array", dont_gc_arguments);
765 } else {
766 __ set_info("new_object_array", dont_gc_arguments);
767 }
768
769 #ifdef ASSERT
770 // assert object type is really an array of the proper kind
771 {
772 Label ok;
773 Register t0 = obj;
774 __ ldrw(t0, Address(klass, Klass::layout_helper_offset()));
775 __ asrw(t0, t0, Klass::_lh_array_tag_shift);
776 int tag = ((id == new_type_array_id)
777 ? Klass::_lh_array_tag_type_value
778 : Klass::_lh_array_tag_obj_value);
779 __ mov(rscratch1, tag);
780 __ cmpw(t0, rscratch1);
781 __ br(Assembler::EQ, ok);
782 __ stop("assert(is an array klass)");
783 __ should_not_reach_here();
784 __ bind(ok);
785 }
786 #endif // ASSERT
787
788 // If TLAB is disabled, see if there is support for inlining contiguous
789 // allocations.
790 // Otherwise, just go to the slow path.
791 if (!UseTLAB && Universe::heap()->supports_inline_contig_alloc()) {
792 Register arr_size = r5;
793 Register t1 = r10;
794 Register t2 = r11;
795 Label slow_path;
796 assert_different_registers(length, klass, obj, arr_size, t1, t2);
797
798 // check that array length is small enough for fast path.
799 __ mov(rscratch1, C1_MacroAssembler::max_array_allocation_length);
800 __ cmpw(length, rscratch1);
801 __ br(Assembler::HI, slow_path);
802
803 // get the allocation size: round_up(hdr + length << (layout_helper & 0x1F))
804 // since size is positive ldrw does right thing on 64bit
805 __ ldrw(t1, Address(klass, Klass::layout_helper_offset()));
806 // since size is positive movw does right thing on 64bit
807 __ movw(arr_size, length);
808 __ lslvw(arr_size, length, t1);
809 __ ubfx(t1, t1, Klass::_lh_header_size_shift,
810 exact_log2(Klass::_lh_header_size_mask + 1));
811 __ add(arr_size, arr_size, t1);
812 __ add(arr_size, arr_size, MinObjAlignmentInBytesMask); // align up
813 __ andr(arr_size, arr_size, ~MinObjAlignmentInBytesMask);
814
815 __ eden_allocate(obj, arr_size, 0, t1, slow_path); // preserves arr_size
816
817 __ initialize_header(obj, klass, length, t1, t2);
818 __ ldrb(t1, Address(klass, in_bytes(Klass::layout_helper_offset()) + (Klass::_lh_header_size_shift / BitsPerByte)));
819 assert(Klass::_lh_header_size_shift % BitsPerByte == 0, "bytewise");
820 assert(Klass::_lh_header_size_mask <= 0xFF, "bytewise");
821 __ andr(t1, t1, Klass::_lh_header_size_mask);
822 __ sub(arr_size, arr_size, t1); // body length
823 __ add(t1, t1, obj); // body start
824 __ initialize_body(t1, arr_size, 0, t1, t2);
825 __ membar(Assembler::StoreStore);
826 __ verify_oop(obj);
827
828 __ ret(lr);
829
830 __ bind(slow_path);
831 }
832
833 __ enter();
834 OopMap* map = save_live_registers(sasm);
835 int call_offset;
836 if (id == new_type_array_id) {
837 call_offset = __ call_RT(obj, noreg, CAST_FROM_FN_PTR(address, new_type_array), klass, length);
838 } else {
839 call_offset = __ call_RT(obj, noreg, CAST_FROM_FN_PTR(address, new_object_array), klass, length);
840 }
841
842 oop_maps = new OopMapSet();
843 oop_maps->add_gc_map(call_offset, map);
844 restore_live_registers_except_r0(sasm);
845
846 __ verify_oop(obj);
847 __ leave();
848 __ ret(lr);
849
850 // r0: new array
851 }
852 break;
853
854 case new_multi_array_id:
855 { StubFrame f(sasm, "new_multi_array", dont_gc_arguments);
856 // r0,: klass
857 // r19,: rank
858 // r2: address of 1st dimension
859 OopMap* map = save_live_registers(sasm);
860 __ mov(c_rarg1, r0);
861 __ mov(c_rarg3, r2);
862 __ mov(c_rarg2, r19);
863 int call_offset = __ call_RT(r0, noreg, CAST_FROM_FN_PTR(address, new_multi_array), r1, r2, r3);
864
865 oop_maps = new OopMapSet();
866 oop_maps->add_gc_map(call_offset, map);
867 restore_live_registers_except_r0(sasm);
868
869 // r0,: new multi array
870 __ verify_oop(r0);
871 }
872 break;
873
874 case register_finalizer_id:
875 {
876 __ set_info("register_finalizer", dont_gc_arguments);
877
878 // This is called via call_runtime so the arguments
879 // will be place in C abi locations
880
881 __ verify_oop(c_rarg0);
882
883 // load the klass and check the has finalizer flag
884 Label register_finalizer;
885 Register t = r5;
886 __ load_klass(t, r0);
887 __ ldrw(t, Address(t, Klass::access_flags_offset()));
888 __ tbnz(t, exact_log2(JVM_ACC_HAS_FINALIZER), register_finalizer);
889 __ ret(lr);
890
891 __ bind(register_finalizer);
892 __ enter();
893 OopMap* oop_map = save_live_registers(sasm);
894 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, SharedRuntime::register_finalizer), r0);
895 oop_maps = new OopMapSet();
896 oop_maps->add_gc_map(call_offset, oop_map);
897
898 // Now restore all the live registers
899 restore_live_registers(sasm);
900
901 __ leave();
902 __ ret(lr);
903 }
904 break;
905
906 case throw_class_cast_exception_id:
907 { StubFrame f(sasm, "throw_class_cast_exception", dont_gc_arguments, does_not_return);
908 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_class_cast_exception), true);
909 }
910 break;
911
912 case throw_incompatible_class_change_error_id:
913 { StubFrame f(sasm, "throw_incompatible_class_cast_exception", dont_gc_arguments, does_not_return);
914 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_incompatible_class_change_error), false);
915 }
916 break;
917
918 case slow_subtype_check_id:
919 {
920 // Typical calling sequence:
921 // __ push(klass_RInfo); // object klass or other subclass
922 // __ push(sup_k_RInfo); // array element klass or other superclass
923 // __ bl(slow_subtype_check);
924 // Note that the subclass is pushed first, and is therefore deepest.
925 enum layout {
926 r0_off, r0_off_hi,
927 r2_off, r2_off_hi,
928 r4_off, r4_off_hi,
929 r5_off, r5_off_hi,
930 sup_k_off, sup_k_off_hi,
931 klass_off, klass_off_hi,
932 framesize,
933 result_off = sup_k_off
934 };
935
936 __ set_info("slow_subtype_check", dont_gc_arguments);
937 __ push(RegSet::of(r0, r2, r4, r5), sp);
938
939 // This is called by pushing args and not with C abi
940 // __ ldr(r4, Address(sp, (klass_off) * VMRegImpl::stack_slot_size)); // subclass
941 // __ ldr(r0, Address(sp, (sup_k_off) * VMRegImpl::stack_slot_size)); // superclass
942
943 __ ldp(r4, r0, Address(sp, (sup_k_off) * VMRegImpl::stack_slot_size));
944
945 Label miss;
946 __ check_klass_subtype_slow_path(r4, r0, r2, r5, NULL, &miss);
947
948 // fallthrough on success:
949 __ mov(rscratch1, 1);
950 __ str(rscratch1, Address(sp, (result_off) * VMRegImpl::stack_slot_size)); // result
951 __ pop(RegSet::of(r0, r2, r4, r5), sp);
952 __ ret(lr);
953
954 __ bind(miss);
955 __ str(zr, Address(sp, (result_off) * VMRegImpl::stack_slot_size)); // result
956 __ pop(RegSet::of(r0, r2, r4, r5), sp);
957 __ ret(lr);
958 }
959 break;
960
961 case monitorenter_nofpu_id:
962 save_fpu_registers = false;
963 // fall through
964 case monitorenter_id:
965 {
966 StubFrame f(sasm, "monitorenter", dont_gc_arguments);
967 OopMap* map = save_live_registers(sasm, save_fpu_registers);
968
969 // Called with store_parameter and not C abi
970
971 f.load_argument(1, r0); // r0,: object
972 f.load_argument(0, r1); // r1,: lock address
973
974 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, monitorenter), r0, r1);
975
976 oop_maps = new OopMapSet();
977 oop_maps->add_gc_map(call_offset, map);
978 restore_live_registers(sasm, save_fpu_registers);
979 }
980 break;
981
982 case monitorexit_nofpu_id:
983 save_fpu_registers = false;
984 // fall through
985 case monitorexit_id:
986 {
987 StubFrame f(sasm, "monitorexit", dont_gc_arguments);
988 OopMap* map = save_live_registers(sasm, save_fpu_registers);
989
990 // Called with store_parameter and not C abi
991
992 f.load_argument(0, r0); // r0,: lock address
993
994 // note: really a leaf routine but must setup last java sp
995 // => use call_RT for now (speed can be improved by
996 // doing last java sp setup manually)
997 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, monitorexit), r0);
998
999 oop_maps = new OopMapSet();
1000 oop_maps->add_gc_map(call_offset, map);
1001 restore_live_registers(sasm, save_fpu_registers);
1002 }
1003 break;
1004
1005 case deoptimize_id:
1006 {
1007 StubFrame f(sasm, "deoptimize", dont_gc_arguments, does_not_return);
1008 OopMap* oop_map = save_live_registers(sasm);
1009 f.load_argument(0, c_rarg1);
1010 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, deoptimize), c_rarg1);
1011
1012 oop_maps = new OopMapSet();
1013 oop_maps->add_gc_map(call_offset, oop_map);
1014 restore_live_registers(sasm);
1015 DeoptimizationBlob* deopt_blob = SharedRuntime::deopt_blob();
1016 assert(deopt_blob != NULL, "deoptimization blob must have been created");
1017 __ leave();
1018 __ far_jump(RuntimeAddress(deopt_blob->unpack_with_reexecution()));
1019 }
1020 break;
1021
1022 case throw_range_check_failed_id:
1023 { StubFrame f(sasm, "range_check_failed", dont_gc_arguments, does_not_return);
1024 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_range_check_exception), true);
1025 }
1026 break;
1027
1028 case unwind_exception_id:
1029 { __ set_info("unwind_exception", dont_gc_arguments);
1030 // note: no stubframe since we are about to leave the current
1031 // activation and we are calling a leaf VM function only.
1032 generate_unwind_exception(sasm);
1033 }
1034 break;
1035
1036 case access_field_patching_id:
1037 { StubFrame f(sasm, "access_field_patching", dont_gc_arguments, does_not_return);
1038 // we should set up register map
1039 oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, access_field_patching));
1040 }
1041 break;
1042
1043 case load_klass_patching_id:
1044 { StubFrame f(sasm, "load_klass_patching", dont_gc_arguments, does_not_return);
1045 // we should set up register map
1046 oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, move_klass_patching));
1047 }
1048 break;
1049
1050 case load_mirror_patching_id:
1051 { StubFrame f(sasm, "load_mirror_patching", dont_gc_arguments, does_not_return);
1052 // we should set up register map
1053 oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, move_mirror_patching));
1054 }
1055 break;
1056
1057 case load_appendix_patching_id:
1058 { StubFrame f(sasm, "load_appendix_patching", dont_gc_arguments, does_not_return);
1059 // we should set up register map
1060 oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, move_appendix_patching));
1061 }
1062 break;
1063
1064 case handle_exception_nofpu_id:
1065 case handle_exception_id:
1066 { StubFrame f(sasm, "handle_exception", dont_gc_arguments);
1067 oop_maps = generate_handle_exception(id, sasm);
1068 }
1069 break;
1070
1071 case handle_exception_from_callee_id:
1072 { StubFrame f(sasm, "handle_exception_from_callee", dont_gc_arguments);
1073 oop_maps = generate_handle_exception(id, sasm);
1074 }
1075 break;
1076
1077 case throw_index_exception_id:
1078 { StubFrame f(sasm, "index_range_check_failed", dont_gc_arguments, does_not_return);
1079 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_index_exception), true);
1080 }
1081 break;
1082
1083 case throw_array_store_exception_id:
1084 { StubFrame f(sasm, "throw_array_store_exception", dont_gc_arguments, does_not_return);
1085 // tos + 0: link
1086 // + 1: return address
1087 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_array_store_exception), true);
1088 }
1089 break;
1090
1091 case predicate_failed_trap_id:
1092 {
1093 StubFrame f(sasm, "predicate_failed_trap", dont_gc_arguments, does_not_return);
1094
1095 OopMap* map = save_live_registers(sasm);
1096
1097 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, predicate_failed_trap));
1098 oop_maps = new OopMapSet();
1099 oop_maps->add_gc_map(call_offset, map);
1100 restore_live_registers(sasm);
1101 __ leave();
1102 DeoptimizationBlob* deopt_blob = SharedRuntime::deopt_blob();
1103 assert(deopt_blob != NULL, "deoptimization blob must have been created");
1104
1105 __ far_jump(RuntimeAddress(deopt_blob->unpack_with_reexecution()));
1106 }
1107 break;
1108
1109 case dtrace_object_alloc_id:
1110 { // c_rarg0: object
1111 StubFrame f(sasm, "dtrace_object_alloc", dont_gc_arguments);
1112 save_live_registers(sasm);
1113
1114 __ call_VM_leaf(CAST_FROM_FN_PTR(address, static_cast<int (*)(oopDesc*)>(SharedRuntime::dtrace_object_alloc)), c_rarg0);
1115
1116 restore_live_registers(sasm);
1117 }
1118 break;
1119
1120 default:
1121 { StubFrame f(sasm, "unimplemented entry", dont_gc_arguments, does_not_return);
1122 __ mov(r0, (int)id);
1123 __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, unimplemented_entry), r0);
1124 }
1125 break;
1126 }
1127 }
1128 return oop_maps;
1129 }
1130
1131 #undef __
1132
1133 const char *Runtime1::pd_name_for_address(address entry) { Unimplemented(); return 0; }