1 /*
2 * Copyright (c) 1999, 2018, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2014, 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 "gc/shared/cardTable.hpp"
34 #include "gc/shared/cardTableBarrierSet.hpp"
35 #include "interpreter/interpreter.hpp"
36 #include "nativeInst_aarch64.hpp"
37 #include "oops/compiledICHolder.hpp"
38 #include "oops/oop.inline.hpp"
39 #include "prims/jvmtiExport.hpp"
40 #include "register_aarch64.hpp"
41 #include "runtime/sharedRuntime.hpp"
42 #include "runtime/signature.hpp"
43 #include "runtime/vframe.hpp"
44 #include "runtime/vframeArray.hpp"
45 #include "vmreg_aarch64.inline.hpp"
46
47
48 // Implementation of StubAssembler
49
50 int StubAssembler::call_RT(Register oop_result1, Register metadata_result, address entry, int args_size) {
51 // setup registers
52 assert(!(oop_result1->is_valid() || metadata_result->is_valid()) || oop_result1 != metadata_result, "registers must be different");
53 assert(oop_result1 != rthread && metadata_result != rthread, "registers must be different");
54 assert(args_size >= 0, "illegal args_size");
55 bool align_stack = false;
56
57 mov(c_rarg0, rthread);
58 set_num_rt_args(0); // Nothing on stack
59
60 Label retaddr;
61 set_last_Java_frame(sp, rfp, retaddr, rscratch1);
62
63 // do the call
64 lea(rscratch1, RuntimeAddress(entry));
65 blrt(rscratch1, args_size + 1, 8, 1);
66 bind(retaddr);
67 int call_offset = offset();
68 // verify callee-saved register
69 #ifdef ASSERT
70 push(r0, sp);
71 { Label L;
72 get_thread(r0);
73 cmp(rthread, r0);
74 br(Assembler::EQ, L);
75 stop("StubAssembler::call_RT: rthread not callee saved?");
76 bind(L);
77 }
78 pop(r0, sp);
79 #endif
80 reset_last_Java_frame(true);
81 maybe_isb();
82
83 // check for pending exceptions
84 { Label L;
85 // check for pending exceptions (java_thread is set upon return)
86 ldr(rscratch1, Address(rthread, in_bytes(Thread::pending_exception_offset())));
87 cbz(rscratch1, L);
88 // exception pending => remove activation and forward to exception handler
89 // make sure that the vm_results are cleared
90 if (oop_result1->is_valid()) {
91 str(zr, Address(rthread, JavaThread::vm_result_offset()));
92 }
93 if (metadata_result->is_valid()) {
94 str(zr, Address(rthread, JavaThread::vm_result_2_offset()));
95 }
96 if (frame_size() == no_frame_size) {
97 leave();
98 far_jump(RuntimeAddress(StubRoutines::forward_exception_entry()));
99 } else if (_stub_id == Runtime1::forward_exception_id) {
100 should_not_reach_here();
101 } else {
102 far_jump(RuntimeAddress(Runtime1::entry_for(Runtime1::forward_exception_id)));
103 }
104 bind(L);
105 }
106 // get oop results if there are any and reset the values in the thread
107 if (oop_result1->is_valid()) {
108 get_vm_result(oop_result1, rthread);
109 }
110 if (metadata_result->is_valid()) {
111 get_vm_result_2(metadata_result, rthread);
112 }
113 return call_offset;
114 }
115
116
117 int StubAssembler::call_RT(Register oop_result1, Register metadata_result, address entry, Register arg1) {
118 mov(c_rarg1, arg1);
119 return call_RT(oop_result1, metadata_result, entry, 1);
120 }
121
122
123 int StubAssembler::call_RT(Register oop_result1, Register metadata_result, address entry, Register arg1, Register arg2) {
124 if (c_rarg1 == arg2) {
125 if (c_rarg2 == arg1) {
126 mov(rscratch1, arg1);
127 mov(arg1, arg2);
128 mov(arg2, rscratch1);
129 } else {
130 mov(c_rarg2, arg2);
131 mov(c_rarg1, arg1);
132 }
133 } else {
134 mov(c_rarg1, arg1);
135 mov(c_rarg2, arg2);
136 }
137 return call_RT(oop_result1, metadata_result, entry, 2);
138 }
139
140
141 int StubAssembler::call_RT(Register oop_result1, Register metadata_result, address entry, Register arg1, Register arg2, Register arg3) {
142 // if there is any conflict use the stack
143 if (arg1 == c_rarg2 || arg1 == c_rarg3 ||
144 arg2 == c_rarg1 || arg1 == c_rarg3 ||
145 arg3 == c_rarg1 || arg1 == c_rarg2) {
146 stp(arg3, arg2, Address(pre(sp, 2 * wordSize)));
147 stp(arg1, zr, Address(pre(sp, -2 * wordSize)));
148 ldp(c_rarg1, zr, Address(post(sp, 2 * wordSize)));
149 ldp(c_rarg3, c_rarg2, Address(post(sp, 2 * wordSize)));
150 } else {
151 mov(c_rarg1, arg1);
152 mov(c_rarg2, arg2);
153 mov(c_rarg3, arg3);
154 }
155 return call_RT(oop_result1, metadata_result, entry, 3);
156 }
157
158 // Implementation of StubFrame
159
160 class StubFrame: public StackObj {
161 private:
162 StubAssembler* _sasm;
163
164 public:
165 StubFrame(StubAssembler* sasm, const char* name, bool must_gc_arguments);
166 void load_argument(int offset_in_words, Register reg);
167
168 ~StubFrame();
169 };;
170
171 void StubAssembler::prologue(const char* name, bool must_gc_arguments) {
172 set_info(name, must_gc_arguments);
173 enter();
174 }
175
176 void StubAssembler::epilogue() {
177 leave();
178 ret(lr);
179 }
180
181 #define __ _sasm->
182
183 StubFrame::StubFrame(StubAssembler* sasm, const char* name, bool must_gc_arguments) {
184 _sasm = sasm;
185 __ prologue(name, must_gc_arguments);
186 }
187
188 // load parameters that were stored with LIR_Assembler::store_parameter
189 // Note: offsets for store_parameter and load_argument must match
190 void StubFrame::load_argument(int offset_in_words, Register reg) {
191 __ load_parameter(offset_in_words, reg);
192 }
193
194
195 StubFrame::~StubFrame() {
196 __ epilogue();
197 }
198
199 #undef __
200
201
202 // Implementation of Runtime1
203
204 #define __ sasm->
205
206 const int float_regs_as_doubles_size_in_slots = pd_nof_fpu_regs_frame_map * 2;
207
208 // Stack layout for saving/restoring all the registers needed during a runtime
209 // call (this includes deoptimization)
210 // Note: note that users of this frame may well have arguments to some runtime
211 // while these values are on the stack. These positions neglect those arguments
212 // but the code in save_live_registers will take the argument count into
213 // account.
214 //
215
216 enum reg_save_layout {
217 reg_save_frame_size = 32 /* float */ + 32 /* integer */
218 };
219
220 // Save off registers which might be killed by calls into the runtime.
221 // Tries to smart of about FP registers. In particular we separate
222 // saving and describing the FPU registers for deoptimization since we
223 // have to save the FPU registers twice if we describe them. The
224 // deopt blob is the only thing which needs to describe FPU registers.
225 // In all other cases it should be sufficient to simply save their
226 // current value.
227
228 static int cpu_reg_save_offsets[FrameMap::nof_cpu_regs];
229 static int fpu_reg_save_offsets[FrameMap::nof_fpu_regs];
230 static int reg_save_size_in_words;
231 static int frame_size_in_bytes = -1;
232
233 static OopMap* generate_oop_map(StubAssembler* sasm, bool save_fpu_registers) {
234 int frame_size_in_bytes = reg_save_frame_size * BytesPerWord;
235 sasm->set_frame_size(frame_size_in_bytes / BytesPerWord);
236 int frame_size_in_slots = frame_size_in_bytes / sizeof(jint);
237 OopMap* oop_map = new OopMap(frame_size_in_slots, 0);
238
239 for (int i = 0; i < FrameMap::nof_cpu_regs; i++) {
240 Register r = as_Register(i);
241 if (i <= 18 && i != rscratch1->encoding() && i != rscratch2->encoding()) {
242 int sp_offset = cpu_reg_save_offsets[i];
243 oop_map->set_callee_saved(VMRegImpl::stack2reg(sp_offset),
244 r->as_VMReg());
245 }
246 }
247
248 if (save_fpu_registers) {
249 for (int i = 0; i < FrameMap::nof_fpu_regs; i++) {
250 FloatRegister r = as_FloatRegister(i);
251 {
252 int sp_offset = fpu_reg_save_offsets[i];
253 oop_map->set_callee_saved(VMRegImpl::stack2reg(sp_offset),
254 r->as_VMReg());
255 }
256 }
257 }
258 return oop_map;
259 }
260
261 static OopMap* save_live_registers(StubAssembler* sasm,
262 bool save_fpu_registers = true) {
263 __ block_comment("save_live_registers");
264
265 __ push(RegSet::range(r0, r29), sp); // integer registers except lr & sp
266
267 if (save_fpu_registers) {
268 for (int i = 30; i >= 0; i -= 2)
269 __ stpd(as_FloatRegister(i), as_FloatRegister(i+1),
270 Address(__ pre(sp, -2 * wordSize)));
271 } else {
272 __ add(sp, sp, -32 * wordSize);
273 }
274
275 return generate_oop_map(sasm, save_fpu_registers);
276 }
277
278 static void restore_live_registers(StubAssembler* sasm, bool restore_fpu_registers = true) {
279 if (restore_fpu_registers) {
280 for (int i = 0; i < 32; i += 2)
281 __ ldpd(as_FloatRegister(i), as_FloatRegister(i+1),
282 Address(__ post(sp, 2 * wordSize)));
283 } else {
284 __ add(sp, sp, 32 * wordSize);
285 }
286
287 __ pop(RegSet::range(r0, r29), sp);
288 }
289
290 static void restore_live_registers_except_r0(StubAssembler* sasm, bool restore_fpu_registers = true) {
291
292 if (restore_fpu_registers) {
293 for (int i = 0; i < 32; i += 2)
294 __ ldpd(as_FloatRegister(i), as_FloatRegister(i+1),
295 Address(__ post(sp, 2 * wordSize)));
296 } else {
297 __ add(sp, sp, 32 * wordSize);
298 }
299
300 __ ldp(zr, r1, Address(__ post(sp, 16)));
301 __ pop(RegSet::range(r2, r29), sp);
302 }
303
304
305
306 void Runtime1::initialize_pd() {
307 int i;
308 int sp_offset = 0;
309
310 // all float registers are saved explicitly
311 assert(FrameMap::nof_fpu_regs == 32, "double registers not handled here");
312 for (i = 0; i < FrameMap::nof_fpu_regs; i++) {
313 fpu_reg_save_offsets[i] = sp_offset;
314 sp_offset += 2; // SP offsets are in halfwords
315 }
316
317 for (i = 0; i < FrameMap::nof_cpu_regs; i++) {
318 Register r = as_Register(i);
319 cpu_reg_save_offsets[i] = sp_offset;
320 sp_offset += 2; // SP offsets are in halfwords
321 }
322 }
323
324
325 // target: the entry point of the method that creates and posts the exception oop
326 // has_argument: true if the exception needs arguments (passed in rscratch1 and rscratch2)
327
328 OopMapSet* Runtime1::generate_exception_throw(StubAssembler* sasm, address target, bool has_argument) {
329 // make a frame and preserve the caller's caller-save registers
330 OopMap* oop_map = save_live_registers(sasm);
331 int call_offset;
332 if (!has_argument) {
333 call_offset = __ call_RT(noreg, noreg, target);
334 } else {
335 __ mov(c_rarg1, rscratch1);
336 __ mov(c_rarg2, rscratch2);
337 call_offset = __ call_RT(noreg, noreg, target);
338 }
339 OopMapSet* oop_maps = new OopMapSet();
340 oop_maps->add_gc_map(call_offset, oop_map);
341
342 __ should_not_reach_here();
343 return oop_maps;
344 }
345
346
347 OopMapSet* Runtime1::generate_handle_exception(StubID id, StubAssembler *sasm) {
348 __ block_comment("generate_handle_exception");
349
350 // incoming parameters
351 const Register exception_oop = r0;
352 const Register exception_pc = r3;
353 // other registers used in this stub
354
355 // Save registers, if required.
356 OopMapSet* oop_maps = new OopMapSet();
357 OopMap* oop_map = NULL;
358 switch (id) {
359 case forward_exception_id:
360 // We're handling an exception in the context of a compiled frame.
361 // The registers have been saved in the standard places. Perform
362 // an exception lookup in the caller and dispatch to the handler
363 // if found. Otherwise unwind and dispatch to the callers
364 // exception handler.
365 oop_map = generate_oop_map(sasm, 1 /*thread*/);
366
367 // load and clear pending exception oop into r0
368 __ ldr(exception_oop, Address(rthread, Thread::pending_exception_offset()));
369 __ str(zr, Address(rthread, Thread::pending_exception_offset()));
370
371 // load issuing PC (the return address for this stub) into r3
372 __ ldr(exception_pc, Address(rfp, 1*BytesPerWord));
373
374 // make sure that the vm_results are cleared (may be unnecessary)
375 __ str(zr, Address(rthread, JavaThread::vm_result_offset()));
376 __ str(zr, Address(rthread, JavaThread::vm_result_2_offset()));
377 break;
378 case handle_exception_nofpu_id:
379 case handle_exception_id:
380 // At this point all registers MAY be live.
381 oop_map = save_live_registers(sasm, id != handle_exception_nofpu_id);
382 break;
383 case handle_exception_from_callee_id: {
384 // At this point all registers except exception oop (r0) and
385 // exception pc (lr) are dead.
386 const int frame_size = 2 /*fp, return address*/;
387 oop_map = new OopMap(frame_size * VMRegImpl::slots_per_word, 0);
388 sasm->set_frame_size(frame_size);
389 break;
390 }
391 default:
392 __ should_not_reach_here();
393 break;
394 }
395
396 // verify that only r0 and r3 are valid at this time
397 __ invalidate_registers(false, true, true, false, true, true);
398 // verify that r0 contains a valid exception
399 __ verify_not_null_oop(exception_oop);
400
401 #ifdef ASSERT
402 // check that fields in JavaThread for exception oop and issuing pc are
403 // empty before writing to them
404 Label oop_empty;
405 __ ldr(rscratch1, Address(rthread, JavaThread::exception_oop_offset()));
406 __ cbz(rscratch1, oop_empty);
407 __ stop("exception oop already set");
408 __ bind(oop_empty);
409
410 Label pc_empty;
411 __ ldr(rscratch1, Address(rthread, JavaThread::exception_pc_offset()));
412 __ cbz(rscratch1, pc_empty);
413 __ stop("exception pc already set");
414 __ bind(pc_empty);
415 #endif
416
417 // save exception oop and issuing pc into JavaThread
418 // (exception handler will load it from here)
419 __ str(exception_oop, Address(rthread, JavaThread::exception_oop_offset()));
420 __ str(exception_pc, Address(rthread, JavaThread::exception_pc_offset()));
421
422 // patch throwing pc into return address (has bci & oop map)
423 __ str(exception_pc, Address(rfp, 1*BytesPerWord));
424
425 // compute the exception handler.
426 // the exception oop and the throwing pc are read from the fields in JavaThread
427 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, exception_handler_for_pc));
428 oop_maps->add_gc_map(call_offset, oop_map);
429
430 // r0: handler address
431 // will be the deopt blob if nmethod was deoptimized while we looked up
432 // handler regardless of whether handler existed in the nmethod.
433
434 // only r0 is valid at this time, all other registers have been destroyed by the runtime call
435 __ invalidate_registers(false, true, true, true, true, true);
436
437 // patch the return address, this stub will directly return to the exception handler
438 __ str(r0, Address(rfp, 1*BytesPerWord));
439
440 switch (id) {
441 case forward_exception_id:
442 case handle_exception_nofpu_id:
443 case handle_exception_id:
444 // Restore the registers that were saved at the beginning.
445 restore_live_registers(sasm, id != handle_exception_nofpu_id);
446 break;
447 case handle_exception_from_callee_id:
448 // Pop the return address.
449 __ leave();
450 __ ret(lr); // jump to exception handler
451 break;
452 default: ShouldNotReachHere();
453 }
454
455 return oop_maps;
456 }
457
458
459 void Runtime1::generate_unwind_exception(StubAssembler *sasm) {
460 // incoming parameters
461 const Register exception_oop = r0;
462 // callee-saved copy of exception_oop during runtime call
463 const Register exception_oop_callee_saved = r19;
464 // other registers used in this stub
465 const Register exception_pc = r3;
466 const Register handler_addr = r1;
467
468 // verify that only r0, is valid at this time
469 __ invalidate_registers(false, true, true, true, true, true);
470
471 #ifdef ASSERT
472 // check that fields in JavaThread for exception oop and issuing pc are empty
473 Label oop_empty;
474 __ ldr(rscratch1, Address(rthread, JavaThread::exception_oop_offset()));
475 __ cbz(rscratch1, oop_empty);
476 __ stop("exception oop must be empty");
477 __ bind(oop_empty);
478
479 Label pc_empty;
480 __ ldr(rscratch1, Address(rthread, JavaThread::exception_pc_offset()));
481 __ cbz(rscratch1, pc_empty);
482 __ stop("exception pc must be empty");
483 __ bind(pc_empty);
484 #endif
485
486 // Save our return address because
487 // exception_handler_for_return_address will destroy it. We also
488 // save exception_oop
489 __ stp(lr, exception_oop, Address(__ pre(sp, -2 * wordSize)));
490
491 // search the exception handler address of the caller (using the return address)
492 __ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::exception_handler_for_return_address), rthread, lr);
493 // r0: exception handler address of the caller
494
495 // Only R0 is valid at this time; all other registers have been
496 // destroyed by the call.
497 __ invalidate_registers(false, true, true, true, false, true);
498
499 // move result of call into correct register
500 __ mov(handler_addr, r0);
501
502 // get throwing pc (= return address).
503 // lr has been destroyed by the call
504 __ ldp(lr, exception_oop, Address(__ post(sp, 2 * wordSize)));
505 __ mov(r3, lr);
506
507 __ verify_not_null_oop(exception_oop);
508
509 // continue at exception handler (return address removed)
510 // note: do *not* remove arguments when unwinding the
511 // activation since the caller assumes having
512 // all arguments on the stack when entering the
513 // runtime to determine the exception handler
514 // (GC happens at call site with arguments!)
515 // r0: exception oop
516 // r3: throwing pc
517 // r1: exception handler
518 __ br(handler_addr);
519 }
520
521
522
523 OopMapSet* Runtime1::generate_patching(StubAssembler* sasm, address target) {
524 // use the maximum number of runtime-arguments here because it is difficult to
525 // distinguish each RT-Call.
526 // Note: This number affects also the RT-Call in generate_handle_exception because
527 // the oop-map is shared for all calls.
528 DeoptimizationBlob* deopt_blob = SharedRuntime::deopt_blob();
529 assert(deopt_blob != NULL, "deoptimization blob must have been created");
530
531 OopMap* oop_map = save_live_registers(sasm);
532
533 __ mov(c_rarg0, rthread);
534 Label retaddr;
535 __ set_last_Java_frame(sp, rfp, retaddr, rscratch1);
536 // do the call
537 __ lea(rscratch1, RuntimeAddress(target));
538 __ blrt(rscratch1, 1, 0, 1);
539 __ bind(retaddr);
540 OopMapSet* oop_maps = new OopMapSet();
541 oop_maps->add_gc_map(__ offset(), oop_map);
542 // verify callee-saved register
543 #ifdef ASSERT
544 { Label L;
545 __ get_thread(rscratch1);
546 __ cmp(rthread, rscratch1);
547 __ br(Assembler::EQ, L);
548 __ stop("StubAssembler::call_RT: rthread not callee saved?");
549 __ bind(L);
550 }
551 #endif
552 __ reset_last_Java_frame(true);
553 __ maybe_isb();
554
555 // check for pending exceptions
556 { Label L;
557 __ ldr(rscratch1, Address(rthread, Thread::pending_exception_offset()));
558 __ cbz(rscratch1, L);
559 // exception pending => remove activation and forward to exception handler
560
561 { Label L1;
562 __ cbnz(r0, L1); // have we deoptimized?
563 __ far_jump(RuntimeAddress(Runtime1::entry_for(Runtime1::forward_exception_id)));
564 __ bind(L1);
565 }
566
567 // the deopt blob expects exceptions in the special fields of
568 // JavaThread, so copy and clear pending exception.
569
570 // load and clear pending exception
571 __ ldr(r0, Address(rthread, Thread::pending_exception_offset()));
572 __ str(zr, Address(rthread, Thread::pending_exception_offset()));
573
574 // check that there is really a valid exception
575 __ verify_not_null_oop(r0);
576
577 // load throwing pc: this is the return address of the stub
578 __ mov(r3, lr);
579
580 #ifdef ASSERT
581 // check that fields in JavaThread for exception oop and issuing pc are empty
582 Label oop_empty;
583 __ ldr(rscratch1, Address(rthread, Thread::pending_exception_offset()));
584 __ cbz(rscratch1, oop_empty);
585 __ stop("exception oop must be empty");
586 __ bind(oop_empty);
587
588 Label pc_empty;
589 __ ldr(rscratch1, Address(rthread, JavaThread::exception_pc_offset()));
590 __ cbz(rscratch1, pc_empty);
591 __ stop("exception pc must be empty");
592 __ bind(pc_empty);
593 #endif
594
595 // store exception oop and throwing pc to JavaThread
596 __ str(r0, Address(rthread, JavaThread::exception_oop_offset()));
597 __ str(r3, Address(rthread, JavaThread::exception_pc_offset()));
598
599 restore_live_registers(sasm);
600
601 __ leave();
602
603 // Forward the exception directly to deopt blob. We can blow no
604 // registers and must leave throwing pc on the stack. A patch may
605 // have values live in registers so the entry point with the
606 // exception in tls.
607 __ far_jump(RuntimeAddress(deopt_blob->unpack_with_exception_in_tls()));
608
609 __ bind(L);
610 }
611
612
613 // Runtime will return true if the nmethod has been deoptimized during
614 // the patching process. In that case we must do a deopt reexecute instead.
615
616 Label reexecuteEntry, cont;
617
618 __ cbz(r0, cont); // have we deoptimized?
619
620 // Will reexecute. Proper return address is already on the stack we just restore
621 // registers, pop all of our frame but the return address and jump to the deopt blob
622 restore_live_registers(sasm);
623 __ leave();
624 __ far_jump(RuntimeAddress(deopt_blob->unpack_with_reexecution()));
625
626 __ bind(cont);
627 restore_live_registers(sasm);
628 __ leave();
629 __ ret(lr);
630
631 return oop_maps;
632 }
633
634
635 OopMapSet* Runtime1::generate_code_for(StubID id, StubAssembler* sasm) {
636
637 const Register exception_oop = r0;
638 const Register exception_pc = r3;
639
640 // for better readability
641 const bool must_gc_arguments = true;
642 const bool dont_gc_arguments = false;
643
644 // default value; overwritten for some optimized stubs that are called from methods that do not use the fpu
645 bool save_fpu_registers = true;
646
647 // stub code & info for the different stubs
648 OopMapSet* oop_maps = NULL;
649 OopMap* oop_map = NULL;
650 switch (id) {
651 {
652 case forward_exception_id:
653 {
654 oop_maps = generate_handle_exception(id, sasm);
655 __ leave();
656 __ ret(lr);
657 }
658 break;
659
660 case throw_div0_exception_id:
661 { StubFrame f(sasm, "throw_div0_exception", dont_gc_arguments);
662 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_div0_exception), false);
663 }
664 break;
665
666 case throw_null_pointer_exception_id:
667 { StubFrame f(sasm, "throw_null_pointer_exception", dont_gc_arguments);
668 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_null_pointer_exception), false);
669 }
670 break;
671
672 case new_instance_id:
673 case fast_new_instance_id:
674 case fast_new_instance_init_check_id:
675 {
676 Register klass = r3; // Incoming
677 Register obj = r0; // Result
678
679 if (id == new_instance_id) {
680 __ set_info("new_instance", dont_gc_arguments);
681 } else if (id == fast_new_instance_id) {
682 __ set_info("fast new_instance", dont_gc_arguments);
683 } else {
684 assert(id == fast_new_instance_init_check_id, "bad StubID");
685 __ set_info("fast new_instance init check", dont_gc_arguments);
686 }
687
688 if ((id == fast_new_instance_id || id == fast_new_instance_init_check_id) &&
689 UseTLAB && Universe::heap()->supports_inline_contig_alloc()) {
690 Label slow_path;
691 Register obj_size = r2;
692 Register t1 = r19;
693 Register t2 = r4;
694 assert_different_registers(klass, obj, obj_size, t1, t2);
695
696 __ stp(r19, zr, Address(__ pre(sp, -2 * wordSize)));
697
698 if (id == fast_new_instance_init_check_id) {
699 // make sure the klass is initialized
700 __ ldrb(rscratch1, Address(klass, InstanceKlass::init_state_offset()));
701 __ cmpw(rscratch1, InstanceKlass::fully_initialized);
702 __ br(Assembler::NE, slow_path);
703 }
704
705 #ifdef ASSERT
706 // assert object can be fast path allocated
707 {
708 Label ok, not_ok;
709 __ ldrw(obj_size, Address(klass, Klass::layout_helper_offset()));
710 __ cmp(obj_size, 0u);
711 __ br(Assembler::LE, not_ok); // make sure it's an instance (LH > 0)
712 __ tstw(obj_size, Klass::_lh_instance_slow_path_bit);
713 __ br(Assembler::EQ, ok);
714 __ bind(not_ok);
715 __ stop("assert(can be fast path allocated)");
716 __ should_not_reach_here();
717 __ bind(ok);
718 }
719 #endif // ASSERT
720
721 // get the instance size (size is postive so movl is fine for 64bit)
722 __ ldrw(obj_size, Address(klass, Klass::layout_helper_offset()));
723
724 __ eden_allocate(obj, obj_size, 0, t1, slow_path);
725
726 __ initialize_object(obj, klass, obj_size, 0, t1, t2, /* is_tlab_allocated */ false);
727 __ verify_oop(obj);
728 __ ldp(r19, zr, Address(__ post(sp, 2 * wordSize)));
729 __ ret(lr);
730
731 __ bind(slow_path);
732 __ ldp(r19, zr, Address(__ post(sp, 2 * wordSize)));
733 }
734
735 __ enter();
736 OopMap* map = save_live_registers(sasm);
737 int call_offset = __ call_RT(obj, noreg, CAST_FROM_FN_PTR(address, new_instance), klass);
738 oop_maps = new OopMapSet();
739 oop_maps->add_gc_map(call_offset, map);
740 restore_live_registers_except_r0(sasm);
741 __ verify_oop(obj);
742 __ leave();
743 __ ret(lr);
744
745 // r0,: new instance
746 }
747
748 break;
749
750 case counter_overflow_id:
751 {
752 Register bci = r0, method = r1;
753 __ enter();
754 OopMap* map = save_live_registers(sasm);
755 // Retrieve bci
756 __ ldrw(bci, Address(rfp, 2*BytesPerWord));
757 // And a pointer to the Method*
758 __ ldr(method, Address(rfp, 3*BytesPerWord));
759 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, counter_overflow), bci, method);
760 oop_maps = new OopMapSet();
761 oop_maps->add_gc_map(call_offset, map);
762 restore_live_registers(sasm);
763 __ leave();
764 __ ret(lr);
765 }
766 break;
767
768 case new_type_array_id:
769 case new_object_array_id:
770 {
771 Register length = r19; // Incoming
772 Register klass = r3; // Incoming
773 Register obj = r0; // Result
774
775 if (id == new_type_array_id) {
776 __ set_info("new_type_array", dont_gc_arguments);
777 } else {
778 __ set_info("new_object_array", dont_gc_arguments);
779 }
780
781 #ifdef ASSERT
782 // assert object type is really an array of the proper kind
783 {
784 Label ok;
785 Register t0 = obj;
786 __ ldrw(t0, Address(klass, Klass::layout_helper_offset()));
787 __ asrw(t0, t0, Klass::_lh_array_tag_shift);
788 int tag = ((id == new_type_array_id)
789 ? Klass::_lh_array_tag_type_value
790 : Klass::_lh_array_tag_obj_value);
791 __ mov(rscratch1, tag);
792 __ cmpw(t0, rscratch1);
793 __ br(Assembler::EQ, ok);
794 __ stop("assert(is an array klass)");
795 __ should_not_reach_here();
796 __ bind(ok);
797 }
798 #endif // ASSERT
799
800 if (UseTLAB && Universe::heap()->supports_inline_contig_alloc()) {
801 Register arr_size = r4;
802 Register t1 = r2;
803 Register t2 = r5;
804 Label slow_path;
805 assert_different_registers(length, klass, obj, arr_size, t1, t2);
806
807 // check that array length is small enough for fast path.
808 __ mov(rscratch1, C1_MacroAssembler::max_array_allocation_length);
809 __ cmpw(length, rscratch1);
810 __ br(Assembler::HI, slow_path);
811
812 // get the allocation size: round_up(hdr + length << (layout_helper & 0x1F))
813 // since size is positive ldrw does right thing on 64bit
814 __ ldrw(t1, Address(klass, Klass::layout_helper_offset()));
815 // since size is positive movw does right thing on 64bit
816 __ movw(arr_size, length);
817 __ lslvw(arr_size, length, t1);
818 __ ubfx(t1, t1, Klass::_lh_header_size_shift,
819 exact_log2(Klass::_lh_header_size_mask + 1));
820 __ add(arr_size, arr_size, t1);
821 __ add(arr_size, arr_size, MinObjAlignmentInBytesMask); // align up
822 __ andr(arr_size, arr_size, ~MinObjAlignmentInBytesMask);
823
824 __ eden_allocate(obj, arr_size, 0, t1, slow_path); // preserves arr_size
825
826 __ initialize_header(obj, klass, length, t1, t2);
827 __ ldrb(t1, Address(klass, in_bytes(Klass::layout_helper_offset()) + (Klass::_lh_header_size_shift / BitsPerByte)));
828 assert(Klass::_lh_header_size_shift % BitsPerByte == 0, "bytewise");
829 assert(Klass::_lh_header_size_mask <= 0xFF, "bytewise");
830 __ andr(t1, t1, Klass::_lh_header_size_mask);
831 __ sub(arr_size, arr_size, t1); // body length
832 __ add(t1, t1, obj); // body start
833 __ initialize_body(t1, arr_size, 0, t2);
834 __ verify_oop(obj);
835
836 __ ret(lr);
837
838 __ bind(slow_path);
839 }
840
841 __ enter();
842 OopMap* map = save_live_registers(sasm);
843 int call_offset;
844 if (id == new_type_array_id) {
845 call_offset = __ call_RT(obj, noreg, CAST_FROM_FN_PTR(address, new_type_array), klass, length);
846 } else {
847 call_offset = __ call_RT(obj, noreg, CAST_FROM_FN_PTR(address, new_object_array), klass, length);
848 }
849
850 oop_maps = new OopMapSet();
851 oop_maps->add_gc_map(call_offset, map);
852 restore_live_registers_except_r0(sasm);
853
854 __ verify_oop(obj);
855 __ leave();
856 __ ret(lr);
857
858 // r0: new array
859 }
860 break;
861
862 case new_multi_array_id:
863 { StubFrame f(sasm, "new_multi_array", dont_gc_arguments);
864 // r0,: klass
865 // r19,: rank
866 // r2: address of 1st dimension
867 OopMap* map = save_live_registers(sasm);
868 __ mov(c_rarg1, r0);
869 __ mov(c_rarg3, r2);
870 __ mov(c_rarg2, r19);
871 int call_offset = __ call_RT(r0, noreg, CAST_FROM_FN_PTR(address, new_multi_array), r1, r2, r3);
872
873 oop_maps = new OopMapSet();
874 oop_maps->add_gc_map(call_offset, map);
875 restore_live_registers_except_r0(sasm);
876
877 // r0,: new multi array
878 __ verify_oop(r0);
879 }
880 break;
881
882 case register_finalizer_id:
883 {
884 __ set_info("register_finalizer", dont_gc_arguments);
885
886 // This is called via call_runtime so the arguments
887 // will be place in C abi locations
888
889 __ verify_oop(c_rarg0);
890
891 // load the klass and check the has finalizer flag
892 Label register_finalizer;
893 Register t = r5;
894 __ load_klass(t, r0);
895 __ ldrw(t, Address(t, Klass::access_flags_offset()));
896 __ tbnz(t, exact_log2(JVM_ACC_HAS_FINALIZER), register_finalizer);
897 __ ret(lr);
898
899 __ bind(register_finalizer);
900 __ enter();
901 OopMap* oop_map = save_live_registers(sasm);
902 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, SharedRuntime::register_finalizer), r0);
903 oop_maps = new OopMapSet();
904 oop_maps->add_gc_map(call_offset, oop_map);
905
906 // Now restore all the live registers
907 restore_live_registers(sasm);
908
909 __ leave();
910 __ ret(lr);
911 }
912 break;
913
914 case throw_class_cast_exception_id:
915 { StubFrame f(sasm, "throw_class_cast_exception", dont_gc_arguments);
916 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_class_cast_exception), true);
917 }
918 break;
919
920 case throw_incompatible_class_change_error_id:
921 { StubFrame f(sasm, "throw_incompatible_class_cast_exception", dont_gc_arguments);
922 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_incompatible_class_change_error), false);
923 }
924 break;
925
926 case slow_subtype_check_id:
927 {
928 // Typical calling sequence:
929 // __ push(klass_RInfo); // object klass or other subclass
930 // __ push(sup_k_RInfo); // array element klass or other superclass
931 // __ bl(slow_subtype_check);
932 // Note that the subclass is pushed first, and is therefore deepest.
933 enum layout {
934 r0_off, r0_off_hi,
935 r2_off, r2_off_hi,
936 r4_off, r4_off_hi,
937 r5_off, r5_off_hi,
938 sup_k_off, sup_k_off_hi,
939 klass_off, klass_off_hi,
940 framesize,
941 result_off = sup_k_off
942 };
943
944 __ set_info("slow_subtype_check", dont_gc_arguments);
945 __ push(RegSet::of(r0, r2, r4, r5), sp);
946
947 // This is called by pushing args and not with C abi
948 // __ ldr(r4, Address(sp, (klass_off) * VMRegImpl::stack_slot_size)); // subclass
949 // __ ldr(r0, Address(sp, (sup_k_off) * VMRegImpl::stack_slot_size)); // superclass
950
951 __ ldp(r4, r0, Address(sp, (sup_k_off) * VMRegImpl::stack_slot_size));
952
953 Label miss;
954 __ check_klass_subtype_slow_path(r4, r0, r2, r5, NULL, &miss);
955
956 // fallthrough on success:
957 __ mov(rscratch1, 1);
958 __ str(rscratch1, Address(sp, (result_off) * VMRegImpl::stack_slot_size)); // result
959 __ pop(RegSet::of(r0, r2, r4, r5), sp);
960 __ ret(lr);
961
962 __ bind(miss);
963 __ str(zr, Address(sp, (result_off) * VMRegImpl::stack_slot_size)); // result
964 __ pop(RegSet::of(r0, r2, r4, r5), sp);
965 __ ret(lr);
966 }
967 break;
968
969 case monitorenter_nofpu_id:
970 save_fpu_registers = false;
971 // fall through
972 case monitorenter_id:
973 {
974 StubFrame f(sasm, "monitorenter", dont_gc_arguments);
975 OopMap* map = save_live_registers(sasm, save_fpu_registers);
976
977 // Called with store_parameter and not C abi
978
979 f.load_argument(1, r0); // r0,: object
980 f.load_argument(0, r1); // r1,: lock address
981
982 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, monitorenter), r0, r1);
983
984 oop_maps = new OopMapSet();
985 oop_maps->add_gc_map(call_offset, map);
986 restore_live_registers(sasm, save_fpu_registers);
987 }
988 break;
989
990 case monitorexit_nofpu_id:
991 save_fpu_registers = false;
992 // fall through
993 case monitorexit_id:
994 {
995 StubFrame f(sasm, "monitorexit", dont_gc_arguments);
996 OopMap* map = save_live_registers(sasm, save_fpu_registers);
997
998 // Called with store_parameter and not C abi
999
1000 f.load_argument(0, r0); // r0,: lock address
1001
1002 // note: really a leaf routine but must setup last java sp
1003 // => use call_RT for now (speed can be improved by
1004 // doing last java sp setup manually)
1005 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, monitorexit), r0);
1006
1007 oop_maps = new OopMapSet();
1008 oop_maps->add_gc_map(call_offset, map);
1009 restore_live_registers(sasm, save_fpu_registers);
1010 }
1011 break;
1012
1013 case deoptimize_id:
1014 {
1015 StubFrame f(sasm, "deoptimize", dont_gc_arguments);
1016 OopMap* oop_map = save_live_registers(sasm);
1017 f.load_argument(0, c_rarg1);
1018 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, deoptimize), c_rarg1);
1019
1020 oop_maps = new OopMapSet();
1021 oop_maps->add_gc_map(call_offset, oop_map);
1022 restore_live_registers(sasm);
1023 DeoptimizationBlob* deopt_blob = SharedRuntime::deopt_blob();
1024 assert(deopt_blob != NULL, "deoptimization blob must have been created");
1025 __ leave();
1026 __ far_jump(RuntimeAddress(deopt_blob->unpack_with_reexecution()));
1027 }
1028 break;
1029
1030 case throw_range_check_failed_id:
1031 { StubFrame f(sasm, "range_check_failed", dont_gc_arguments);
1032 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_range_check_exception), true);
1033 }
1034 break;
1035
1036 case unwind_exception_id:
1037 { __ set_info("unwind_exception", dont_gc_arguments);
1038 // note: no stubframe since we are about to leave the current
1039 // activation and we are calling a leaf VM function only.
1040 generate_unwind_exception(sasm);
1041 }
1042 break;
1043
1044 case access_field_patching_id:
1045 { StubFrame f(sasm, "access_field_patching", dont_gc_arguments);
1046 // we should set up register map
1047 oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, access_field_patching));
1048 }
1049 break;
1050
1051 case load_klass_patching_id:
1052 { StubFrame f(sasm, "load_klass_patching", dont_gc_arguments);
1053 // we should set up register map
1054 oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, move_klass_patching));
1055 }
1056 break;
1057
1058 case load_mirror_patching_id:
1059 { StubFrame f(sasm, "load_mirror_patching", dont_gc_arguments);
1060 // we should set up register map
1061 oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, move_mirror_patching));
1062 }
1063 break;
1064
1065 case load_appendix_patching_id:
1066 { StubFrame f(sasm, "load_appendix_patching", dont_gc_arguments);
1067 // we should set up register map
1068 oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, move_appendix_patching));
1069 }
1070 break;
1071
1072 case handle_exception_nofpu_id:
1073 case handle_exception_id:
1074 { StubFrame f(sasm, "handle_exception", dont_gc_arguments);
1075 oop_maps = generate_handle_exception(id, sasm);
1076 }
1077 break;
1078
1079 case handle_exception_from_callee_id:
1080 { StubFrame f(sasm, "handle_exception_from_callee", dont_gc_arguments);
1081 oop_maps = generate_handle_exception(id, sasm);
1082 }
1083 break;
1084
1085 case throw_index_exception_id:
1086 { StubFrame f(sasm, "index_range_check_failed", dont_gc_arguments);
1087 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_index_exception), true);
1088 }
1089 break;
1090
1091 case throw_array_store_exception_id:
1092 { StubFrame f(sasm, "throw_array_store_exception", dont_gc_arguments);
1093 // tos + 0: link
1094 // + 1: return address
1095 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_array_store_exception), true);
1096 }
1097 break;
1098
1099 case predicate_failed_trap_id:
1100 {
1101 StubFrame f(sasm, "predicate_failed_trap", dont_gc_arguments);
1102
1103 OopMap* map = save_live_registers(sasm);
1104
1105 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, predicate_failed_trap));
1106 oop_maps = new OopMapSet();
1107 oop_maps->add_gc_map(call_offset, map);
1108 restore_live_registers(sasm);
1109 __ leave();
1110 DeoptimizationBlob* deopt_blob = SharedRuntime::deopt_blob();
1111 assert(deopt_blob != NULL, "deoptimization blob must have been created");
1112
1113 __ far_jump(RuntimeAddress(deopt_blob->unpack_with_reexecution()));
1114 }
1115 break;
1116
1117
1118 default:
1119 { StubFrame f(sasm, "unimplemented entry", dont_gc_arguments);
1120 __ mov(r0, (int)id);
1121 __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, unimplemented_entry), r0);
1122 __ should_not_reach_here();
1123 }
1124 break;
1125 }
1126 }
1127 return oop_maps;
1128 }
1129
1130 #undef __
1131
1132 const char *Runtime1::pd_name_for_address(address entry) { Unimplemented(); return 0; }