1 /*
2 * Copyright (c) 1999, 2021, 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
393 // make sure that the vm_results are cleared (may be unnecessary)
394 __ str(zr, Address(rthread, JavaThread::vm_result_offset()));
395 __ str(zr, Address(rthread, JavaThread::vm_result_2_offset()));
396 break;
397 case handle_exception_nofpu_id:
398 case handle_exception_id:
399 // At this point all registers MAY be live.
400 oop_map = save_live_registers(sasm, id != handle_exception_nofpu_id);
401 break;
402 case handle_exception_from_callee_id: {
403 // At this point all registers except exception oop (r0) and
404 // exception pc (lr) are dead.
405 const int frame_size = 2 /*fp, return address*/;
406 oop_map = new OopMap(frame_size * VMRegImpl::slots_per_word, 0);
407 sasm->set_frame_size(frame_size);
408 break;
409 }
410 default: ShouldNotReachHere();
411 }
412
413 // verify that only r0 and r3 are valid at this time
414 __ invalidate_registers(false, true, true, false, true, true);
415 // verify that r0 contains a valid exception
416 __ verify_not_null_oop(exception_oop);
417
418 #ifdef ASSERT
419 // check that fields in JavaThread for exception oop and issuing pc are
420 // empty before writing to them
421 Label oop_empty;
422 __ ldr(rscratch1, Address(rthread, JavaThread::exception_oop_offset()));
423 __ cbz(rscratch1, oop_empty);
424 __ stop("exception oop already set");
425 __ bind(oop_empty);
426
427 Label pc_empty;
428 __ ldr(rscratch1, Address(rthread, JavaThread::exception_pc_offset()));
429 __ cbz(rscratch1, pc_empty);
430 __ stop("exception pc already set");
431 __ bind(pc_empty);
432 #endif
433
434 // save exception oop and issuing pc into JavaThread
435 // (exception handler will load it from here)
436 __ str(exception_oop, Address(rthread, JavaThread::exception_oop_offset()));
437 __ str(exception_pc, Address(rthread, JavaThread::exception_pc_offset()));
438
439 // patch throwing pc into return address (has bci & oop map)
440 __ str(exception_pc, Address(rfp, 1*BytesPerWord));
441
442 // compute the exception handler.
443 // the exception oop and the throwing pc are read from the fields in JavaThread
444 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, exception_handler_for_pc));
445 oop_maps->add_gc_map(call_offset, oop_map);
446
447 // r0: handler address
448 // will be the deopt blob if nmethod was deoptimized while we looked up
449 // handler regardless of whether handler existed in the nmethod.
450
451 // only r0 is valid at this time, all other registers have been destroyed by the runtime call
452 __ invalidate_registers(false, true, true, true, true, true);
453
454 // patch the return address, this stub will directly return to the exception handler
455 __ str(r0, Address(rfp, 1*BytesPerWord));
456
457 switch (id) {
458 case forward_exception_id:
459 case handle_exception_nofpu_id:
460 case handle_exception_id:
461 // Restore the registers that were saved at the beginning.
462 restore_live_registers(sasm, id != handle_exception_nofpu_id);
463 break;
464 case handle_exception_from_callee_id:
465 break;
466 default: ShouldNotReachHere();
467 }
468
469 return oop_maps;
470 }
471
472
473 void Runtime1::generate_unwind_exception(StubAssembler *sasm) {
474 // incoming parameters
475 const Register exception_oop = r0;
476 // callee-saved copy of exception_oop during runtime call
477 const Register exception_oop_callee_saved = r19;
478 // other registers used in this stub
479 const Register exception_pc = r3;
480 const Register handler_addr = r1;
481
482 // verify that only r0, is valid at this time
483 __ invalidate_registers(false, true, true, true, true, true);
484
485 #ifdef ASSERT
486 // check that fields in JavaThread for exception oop and issuing pc are empty
487 Label oop_empty;
488 __ ldr(rscratch1, Address(rthread, JavaThread::exception_oop_offset()));
489 __ cbz(rscratch1, oop_empty);
490 __ stop("exception oop must be empty");
491 __ bind(oop_empty);
492
493 Label pc_empty;
494 __ ldr(rscratch1, Address(rthread, JavaThread::exception_pc_offset()));
495 __ cbz(rscratch1, pc_empty);
496 __ stop("exception pc must be empty");
497 __ bind(pc_empty);
498 #endif
499
500 // Save our return address because
501 // exception_handler_for_return_address will destroy it. We also
502 // save exception_oop
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, lr);
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 __ mov(r3, lr);
520
521 __ verify_not_null_oop(exception_oop);
522
523 // continue at exception handler (return address removed)
524 // note: do *not* remove arguments when unwinding the
525 // activation since the caller assumes having
526 // all arguments on the stack when entering the
527 // runtime to determine the exception handler
528 // (GC happens at call site with arguments!)
529 // r0: exception oop
530 // r3: throwing pc
531 // r1: exception handler
532 __ br(handler_addr);
533 }
534
535
536
537 OopMapSet* Runtime1::generate_patching(StubAssembler* sasm, address target) {
538 // use the maximum number of runtime-arguments here because it is difficult to
539 // distinguish each RT-Call.
540 // Note: This number affects also the RT-Call in generate_handle_exception because
541 // the oop-map is shared for all calls.
542 DeoptimizationBlob* deopt_blob = SharedRuntime::deopt_blob();
543 assert(deopt_blob != NULL, "deoptimization blob must have been created");
544
545 OopMap* oop_map = save_live_registers(sasm);
546
547 __ mov(c_rarg0, rthread);
548 Label retaddr;
549 __ set_last_Java_frame(sp, rfp, retaddr, rscratch1);
550 // do the call
551 __ lea(rscratch1, RuntimeAddress(target));
552 __ blr(rscratch1);
553 __ bind(retaddr);
554 OopMapSet* oop_maps = new OopMapSet();
555 oop_maps->add_gc_map(__ offset(), oop_map);
556 // verify callee-saved register
557 #ifdef ASSERT
558 { Label L;
559 __ get_thread(rscratch1);
560 __ cmp(rthread, rscratch1);
561 __ br(Assembler::EQ, L);
562 __ stop("StubAssembler::call_RT: rthread not callee saved?");
563 __ bind(L);
564 }
565 #endif
566
567 __ reset_last_Java_frame(true);
568
569 #ifdef ASSERT
570 // check that fields in JavaThread for exception oop and issuing pc are empty
571 Label oop_empty;
572 __ ldr(rscratch1, Address(rthread, Thread::pending_exception_offset()));
573 __ cbz(rscratch1, oop_empty);
574 __ stop("exception oop must be empty");
575 __ bind(oop_empty);
576
577 Label pc_empty;
578 __ ldr(rscratch1, Address(rthread, JavaThread::exception_pc_offset()));
579 __ cbz(rscratch1, pc_empty);
580 __ stop("exception pc must be empty");
581 __ bind(pc_empty);
582 #endif
583
584 // Runtime will return true if the nmethod has been deoptimized, this is the
585 // expected scenario and anything else is an error. Note that we maintain a
586 // check on the result purely as a defensive measure.
587 Label no_deopt;
588 __ cbz(r0, no_deopt); // Have we deoptimized?
589
590 // Perform a re-execute. The proper return address is already on the stack,
591 // we just need to restore registers, pop all of our frame but the return
592 // address and jump to the deopt blob.
593 restore_live_registers(sasm);
594 __ leave();
595 __ far_jump(RuntimeAddress(deopt_blob->unpack_with_reexecution()));
596
597 __ bind(no_deopt);
598 __ stop("deopt not performed");
599
600 return oop_maps;
601 }
602
603
604 OopMapSet* Runtime1::generate_code_for(StubID id, StubAssembler* sasm) {
605
606 const Register exception_oop = r0;
607 const Register exception_pc = r3;
608
609 // for better readability
610 const bool must_gc_arguments = true;
611 const bool dont_gc_arguments = false;
612
613 // default value; overwritten for some optimized stubs that are called from methods that do not use the fpu
614 bool save_fpu_registers = true;
615
616 // stub code & info for the different stubs
617 OopMapSet* oop_maps = NULL;
618 OopMap* oop_map = NULL;
619 switch (id) {
620 {
621 case forward_exception_id:
622 {
623 oop_maps = generate_handle_exception(id, sasm);
624 __ leave();
625 __ ret(lr);
626 }
627 break;
628
629 case throw_div0_exception_id:
630 { StubFrame f(sasm, "throw_div0_exception", dont_gc_arguments, does_not_return);
631 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_div0_exception), false);
632 }
633 break;
634
635 case throw_null_pointer_exception_id:
636 { StubFrame f(sasm, "throw_null_pointer_exception", dont_gc_arguments, does_not_return);
637 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_null_pointer_exception), false);
638 }
639 break;
640
641 case new_instance_id:
642 case fast_new_instance_id:
643 case fast_new_instance_init_check_id:
644 {
645 Register klass = r3; // Incoming
646 Register obj = r0; // Result
647
648 if (id == new_instance_id) {
649 __ set_info("new_instance", dont_gc_arguments);
650 } else if (id == fast_new_instance_id) {
651 __ set_info("fast new_instance", dont_gc_arguments);
652 } else {
653 assert(id == fast_new_instance_init_check_id, "bad StubID");
654 __ set_info("fast new_instance init check", dont_gc_arguments);
655 }
656
657 // If TLAB is disabled, see if there is support for inlining contiguous
658 // allocations.
659 // Otherwise, just go to the slow path.
660 if ((id == fast_new_instance_id || id == fast_new_instance_init_check_id) &&
661 !UseTLAB && Universe::heap()->supports_inline_contig_alloc()) {
662 Label slow_path;
663 Register obj_size = r19;
664 Register t1 = r10;
665 Register t2 = r11;
666 assert_different_registers(klass, obj, obj_size, t1, t2);
667
668 __ stp(r19, zr, Address(__ pre(sp, -2 * wordSize)));
669
670 if (id == fast_new_instance_init_check_id) {
671 // make sure the klass is initialized
672 __ ldrb(rscratch1, Address(klass, InstanceKlass::init_state_offset()));
673 __ cmpw(rscratch1, InstanceKlass::fully_initialized);
674 __ br(Assembler::NE, slow_path);
675 }
676
677 #ifdef ASSERT
678 // assert object can be fast path allocated
679 {
680 Label ok, not_ok;
681 __ ldrw(obj_size, Address(klass, Klass::layout_helper_offset()));
682 __ cmp(obj_size, (u1)0);
683 __ br(Assembler::LE, not_ok); // make sure it's an instance (LH > 0)
684 __ tstw(obj_size, Klass::_lh_instance_slow_path_bit);
685 __ br(Assembler::EQ, ok);
686 __ bind(not_ok);
687 __ stop("assert(can be fast path allocated)");
688 __ should_not_reach_here();
689 __ bind(ok);
690 }
691 #endif // ASSERT
692
693 // get the instance size (size is postive so movl is fine for 64bit)
694 __ ldrw(obj_size, Address(klass, Klass::layout_helper_offset()));
695
696 __ eden_allocate(obj, obj_size, 0, t1, slow_path);
697
698 __ initialize_object(obj, klass, obj_size, 0, t1, t2, /* is_tlab_allocated */ false);
699 __ verify_oop(obj);
700 __ ldp(r19, zr, Address(__ post(sp, 2 * wordSize)));
701 __ ret(lr);
702
703 __ bind(slow_path);
704 __ ldp(r19, zr, Address(__ post(sp, 2 * wordSize)));
705 }
706
707 __ enter();
708 OopMap* map = save_live_registers(sasm);
709 int call_offset = __ call_RT(obj, noreg, CAST_FROM_FN_PTR(address, new_instance), klass);
710 oop_maps = new OopMapSet();
711 oop_maps->add_gc_map(call_offset, map);
712 restore_live_registers_except_r0(sasm);
713 __ verify_oop(obj);
714 __ leave();
715 __ ret(lr);
716
717 // r0,: new instance
718 }
719
720 break;
721
722 case load_klass_id:
723 {
724 StubFrame f(sasm, "load_klass", dont_gc_arguments);
725 save_live_registers_no_oop_map(sasm, true);
726 f.load_argument(0, r0); // obj
727 __ call_VM_leaf(CAST_FROM_FN_PTR(address, oopDesc::load_klass_runtime), r0);
728 restore_live_registers_except_r0(sasm, true);
729 }
730 break;
731
732 case counter_overflow_id:
733 {
734 Register bci = r0, method = r1;
735 __ enter();
736 OopMap* map = save_live_registers(sasm);
737 // Retrieve bci
738 __ ldrw(bci, Address(rfp, 2*BytesPerWord));
739 // And a pointer to the Method*
740 __ ldr(method, Address(rfp, 3*BytesPerWord));
741 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, counter_overflow), bci, method);
742 oop_maps = new OopMapSet();
743 oop_maps->add_gc_map(call_offset, map);
744 restore_live_registers(sasm);
745 __ leave();
746 __ ret(lr);
747 }
748 break;
749
750 case new_type_array_id:
751 case new_object_array_id:
752 {
753 Register length = r19; // Incoming
754 Register klass = r3; // Incoming
755 Register obj = r0; // Result
756
757 if (id == new_type_array_id) {
758 __ set_info("new_type_array", dont_gc_arguments);
759 } else {
760 __ set_info("new_object_array", dont_gc_arguments);
761 }
762
763 #ifdef ASSERT
764 // assert object type is really an array of the proper kind
765 {
766 Label ok;
767 Register t0 = obj;
768 __ ldrw(t0, Address(klass, Klass::layout_helper_offset()));
769 __ asrw(t0, t0, Klass::_lh_array_tag_shift);
770 int tag = ((id == new_type_array_id)
771 ? Klass::_lh_array_tag_type_value
772 : Klass::_lh_array_tag_obj_value);
773 __ mov(rscratch1, tag);
774 __ cmpw(t0, rscratch1);
775 __ br(Assembler::EQ, ok);
776 __ stop("assert(is an array klass)");
777 __ should_not_reach_here();
778 __ bind(ok);
779 }
780 #endif // ASSERT
781
782 // If TLAB is disabled, see if there is support for inlining contiguous
783 // allocations.
784 // Otherwise, just go to the slow path.
785 if (!UseTLAB && Universe::heap()->supports_inline_contig_alloc()) {
786 Register arr_size = r5;
787 Register t1 = r10;
788 Register t2 = r11;
789 Label slow_path;
790 assert_different_registers(length, klass, obj, arr_size, t1, t2);
791
792 // check that array length is small enough for fast path.
793 __ mov(rscratch1, C1_MacroAssembler::max_array_allocation_length);
794 __ cmpw(length, rscratch1);
795 __ br(Assembler::HI, slow_path);
796
797 // get the allocation size: round_up(hdr + length << (layout_helper & 0x1F))
798 // since size is positive ldrw does right thing on 64bit
799 __ ldrw(t1, Address(klass, Klass::layout_helper_offset()));
800 // since size is positive movw does right thing on 64bit
801 __ movw(arr_size, length);
802 __ lslvw(arr_size, length, t1);
803 __ ubfx(t1, t1, Klass::_lh_header_size_shift,
804 exact_log2(Klass::_lh_header_size_mask + 1));
805 __ add(arr_size, arr_size, t1);
806 __ add(arr_size, arr_size, MinObjAlignmentInBytesMask); // align up
807 __ andr(arr_size, arr_size, ~MinObjAlignmentInBytesMask);
808
809 __ eden_allocate(obj, arr_size, 0, t1, slow_path); // preserves arr_size
810
811 __ initialize_header(obj, klass, length, t1, t2);
812 __ ldrb(t1, Address(klass, in_bytes(Klass::layout_helper_offset()) + (Klass::_lh_header_size_shift / BitsPerByte)));
813 assert(Klass::_lh_header_size_shift % BitsPerByte == 0, "bytewise");
814 assert(Klass::_lh_header_size_mask <= 0xFF, "bytewise");
815 __ andr(t1, t1, Klass::_lh_header_size_mask);
816 __ sub(arr_size, arr_size, t1); // body length
817 __ add(t1, t1, obj); // body start
818 __ initialize_body(t1, arr_size, 0, t1, t2);
819 __ membar(Assembler::StoreStore);
820 __ verify_oop(obj);
821
822 __ ret(lr);
823
824 __ bind(slow_path);
825 }
826
827 __ enter();
828 OopMap* map = save_live_registers(sasm);
829 int call_offset;
830 if (id == new_type_array_id) {
831 call_offset = __ call_RT(obj, noreg, CAST_FROM_FN_PTR(address, new_type_array), klass, length);
832 } else {
833 call_offset = __ call_RT(obj, noreg, CAST_FROM_FN_PTR(address, new_object_array), klass, length);
834 }
835
836 oop_maps = new OopMapSet();
837 oop_maps->add_gc_map(call_offset, map);
838 restore_live_registers_except_r0(sasm);
839
840 __ verify_oop(obj);
841 __ leave();
842 __ ret(lr);
843
844 // r0: new array
845 }
846 break;
847
848 case new_multi_array_id:
849 { StubFrame f(sasm, "new_multi_array", dont_gc_arguments);
850 // r0,: klass
851 // r19,: rank
852 // r2: address of 1st dimension
853 OopMap* map = save_live_registers(sasm);
854 __ mov(c_rarg1, r0);
855 __ mov(c_rarg3, r2);
856 __ mov(c_rarg2, r19);
857 int call_offset = __ call_RT(r0, noreg, CAST_FROM_FN_PTR(address, new_multi_array), r1, r2, r3);
858
859 oop_maps = new OopMapSet();
860 oop_maps->add_gc_map(call_offset, map);
861 restore_live_registers_except_r0(sasm);
862
863 // r0,: new multi array
864 __ verify_oop(r0);
865 }
866 break;
867
868 case register_finalizer_id:
869 {
870 __ set_info("register_finalizer", dont_gc_arguments);
871
872 // This is called via call_runtime so the arguments
873 // will be place in C abi locations
874
875 __ verify_oop(c_rarg0);
876
877 // load the klass and check the has finalizer flag
878 Label register_finalizer;
879 Register t = r5;
880 __ load_klass(t, r0);
881 __ ldrw(t, Address(t, Klass::access_flags_offset()));
882 __ tbnz(t, exact_log2(JVM_ACC_HAS_FINALIZER), register_finalizer);
883 __ ret(lr);
884
885 __ bind(register_finalizer);
886 __ enter();
887 OopMap* oop_map = save_live_registers(sasm);
888 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, SharedRuntime::register_finalizer), r0);
889 oop_maps = new OopMapSet();
890 oop_maps->add_gc_map(call_offset, oop_map);
891
892 // Now restore all the live registers
893 restore_live_registers(sasm);
894
895 __ leave();
896 __ ret(lr);
897 }
898 break;
899
900 case throw_class_cast_exception_id:
901 { StubFrame f(sasm, "throw_class_cast_exception", dont_gc_arguments, does_not_return);
902 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_class_cast_exception), true);
903 }
904 break;
905
906 case throw_incompatible_class_change_error_id:
907 { StubFrame f(sasm, "throw_incompatible_class_cast_exception", dont_gc_arguments, does_not_return);
908 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_incompatible_class_change_error), false);
909 }
910 break;
911
912 case slow_subtype_check_id:
913 {
914 // Typical calling sequence:
915 // __ push(klass_RInfo); // object klass or other subclass
916 // __ push(sup_k_RInfo); // array element klass or other superclass
917 // __ bl(slow_subtype_check);
918 // Note that the subclass is pushed first, and is therefore deepest.
919 enum layout {
920 r0_off, r0_off_hi,
921 r2_off, r2_off_hi,
922 r4_off, r4_off_hi,
923 r5_off, r5_off_hi,
924 sup_k_off, sup_k_off_hi,
925 klass_off, klass_off_hi,
926 framesize,
927 result_off = sup_k_off
928 };
929
930 __ set_info("slow_subtype_check", dont_gc_arguments);
931 __ push(RegSet::of(r0, r2, r4, r5), sp);
932
933 // This is called by pushing args and not with C abi
934 // __ ldr(r4, Address(sp, (klass_off) * VMRegImpl::stack_slot_size)); // subclass
935 // __ ldr(r0, Address(sp, (sup_k_off) * VMRegImpl::stack_slot_size)); // superclass
936
937 __ ldp(r4, r0, Address(sp, (sup_k_off) * VMRegImpl::stack_slot_size));
938
939 Label miss;
940 __ check_klass_subtype_slow_path(r4, r0, r2, r5, NULL, &miss);
941
942 // fallthrough on success:
943 __ mov(rscratch1, 1);
944 __ str(rscratch1, Address(sp, (result_off) * VMRegImpl::stack_slot_size)); // result
945 __ pop(RegSet::of(r0, r2, r4, r5), sp);
946 __ ret(lr);
947
948 __ bind(miss);
949 __ str(zr, Address(sp, (result_off) * VMRegImpl::stack_slot_size)); // result
950 __ pop(RegSet::of(r0, r2, r4, r5), sp);
951 __ ret(lr);
952 }
953 break;
954
955 case monitorenter_nofpu_id:
956 save_fpu_registers = false;
957 // fall through
958 case monitorenter_id:
959 {
960 StubFrame f(sasm, "monitorenter", dont_gc_arguments);
961 OopMap* map = save_live_registers(sasm, save_fpu_registers);
962
963 // Called with store_parameter and not C abi
964
965 f.load_argument(1, r0); // r0,: object
966 f.load_argument(0, r1); // r1,: lock address
967
968 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, monitorenter), r0, r1);
969
970 oop_maps = new OopMapSet();
971 oop_maps->add_gc_map(call_offset, map);
972 restore_live_registers(sasm, save_fpu_registers);
973 }
974 break;
975
976 case monitorexit_nofpu_id:
977 save_fpu_registers = false;
978 // fall through
979 case monitorexit_id:
980 {
981 StubFrame f(sasm, "monitorexit", dont_gc_arguments);
982 OopMap* map = save_live_registers(sasm, save_fpu_registers);
983
984 // Called with store_parameter and not C abi
985
986 f.load_argument(0, r0); // r0,: lock address
987
988 // note: really a leaf routine but must setup last java sp
989 // => use call_RT for now (speed can be improved by
990 // doing last java sp setup manually)
991 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, monitorexit), r0);
992
993 oop_maps = new OopMapSet();
994 oop_maps->add_gc_map(call_offset, map);
995 restore_live_registers(sasm, save_fpu_registers);
996 }
997 break;
998
999 case deoptimize_id:
1000 {
1001 StubFrame f(sasm, "deoptimize", dont_gc_arguments, does_not_return);
1002 OopMap* oop_map = save_live_registers(sasm);
1003 f.load_argument(0, c_rarg1);
1004 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, deoptimize), c_rarg1);
1005
1006 oop_maps = new OopMapSet();
1007 oop_maps->add_gc_map(call_offset, oop_map);
1008 restore_live_registers(sasm);
1009 DeoptimizationBlob* deopt_blob = SharedRuntime::deopt_blob();
1010 assert(deopt_blob != NULL, "deoptimization blob must have been created");
1011 __ leave();
1012 __ far_jump(RuntimeAddress(deopt_blob->unpack_with_reexecution()));
1013 }
1014 break;
1015
1016 case throw_range_check_failed_id:
1017 { StubFrame f(sasm, "range_check_failed", dont_gc_arguments, does_not_return);
1018 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_range_check_exception), true);
1019 }
1020 break;
1021
1022 case unwind_exception_id:
1023 { __ set_info("unwind_exception", dont_gc_arguments);
1024 // note: no stubframe since we are about to leave the current
1025 // activation and we are calling a leaf VM function only.
1026 generate_unwind_exception(sasm);
1027 }
1028 break;
1029
1030 case access_field_patching_id:
1031 { StubFrame f(sasm, "access_field_patching", dont_gc_arguments, does_not_return);
1032 // we should set up register map
1033 oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, access_field_patching));
1034 }
1035 break;
1036
1037 case load_klass_patching_id:
1038 { StubFrame f(sasm, "load_klass_patching", dont_gc_arguments, does_not_return);
1039 // we should set up register map
1040 oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, move_klass_patching));
1041 }
1042 break;
1043
1044 case load_mirror_patching_id:
1045 { StubFrame f(sasm, "load_mirror_patching", dont_gc_arguments, does_not_return);
1046 // we should set up register map
1047 oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, move_mirror_patching));
1048 }
1049 break;
1050
1051 case load_appendix_patching_id:
1052 { StubFrame f(sasm, "load_appendix_patching", dont_gc_arguments, does_not_return);
1053 // we should set up register map
1054 oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, move_appendix_patching));
1055 }
1056 break;
1057
1058 case handle_exception_nofpu_id:
1059 case handle_exception_id:
1060 { StubFrame f(sasm, "handle_exception", dont_gc_arguments);
1061 oop_maps = generate_handle_exception(id, sasm);
1062 }
1063 break;
1064
1065 case handle_exception_from_callee_id:
1066 { StubFrame f(sasm, "handle_exception_from_callee", dont_gc_arguments);
1067 oop_maps = generate_handle_exception(id, sasm);
1068 }
1069 break;
1070
1071 case throw_index_exception_id:
1072 { StubFrame f(sasm, "index_range_check_failed", dont_gc_arguments, does_not_return);
1073 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_index_exception), true);
1074 }
1075 break;
1076
1077 case throw_array_store_exception_id:
1078 { StubFrame f(sasm, "throw_array_store_exception", dont_gc_arguments, does_not_return);
1079 // tos + 0: link
1080 // + 1: return address
1081 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_array_store_exception), true);
1082 }
1083 break;
1084
1085 case predicate_failed_trap_id:
1086 {
1087 StubFrame f(sasm, "predicate_failed_trap", dont_gc_arguments, does_not_return);
1088
1089 OopMap* map = save_live_registers(sasm);
1090
1091 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, predicate_failed_trap));
1092 oop_maps = new OopMapSet();
1093 oop_maps->add_gc_map(call_offset, map);
1094 restore_live_registers(sasm);
1095 __ leave();
1096 DeoptimizationBlob* deopt_blob = SharedRuntime::deopt_blob();
1097 assert(deopt_blob != NULL, "deoptimization blob must have been created");
1098
1099 __ far_jump(RuntimeAddress(deopt_blob->unpack_with_reexecution()));
1100 }
1101 break;
1102
1103 case dtrace_object_alloc_id:
1104 { // c_rarg0: object
1105 StubFrame f(sasm, "dtrace_object_alloc", dont_gc_arguments);
1106 save_live_registers(sasm);
1107
1108 __ call_VM_leaf(CAST_FROM_FN_PTR(address, static_cast<int (*)(oopDesc*)>(SharedRuntime::dtrace_object_alloc)), c_rarg0);
1109
1110 restore_live_registers(sasm);
1111 }
1112 break;
1113
1114 default:
1115 { StubFrame f(sasm, "unimplemented entry", dont_gc_arguments, does_not_return);
1116 __ mov(r0, (int)id);
1117 __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, unimplemented_entry), r0);
1118 }
1119 break;
1120 }
1121 }
1122 return oop_maps;
1123 }
1124
1125 #undef __
1126
1127 const char *Runtime1::pd_name_for_address(address entry) { Unimplemented(); return 0; }