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 * Copyright (c) 2015-2018, Azul Systems, Inc. All rights reserved.
5 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 *
7 * This code is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License version 2 only, as
9 * published by the Free Software Foundation.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 *
25 */
26
27 #include "precompiled.hpp"
28 #include "asm/assembler.hpp"
29 #include "c1/c1_CodeStubs.hpp"
30 #include "c1/c1_Defs.hpp"
31 #include "c1/c1_MacroAssembler.hpp"
32 #include "c1/c1_Runtime1.hpp"
33 #include "compiler/disassembler.hpp"
34 #include "gc/shared/cardTable.hpp"
35 #include "gc/shared/cardTableBarrierSet.hpp"
36 #include "interpreter/interpreter.hpp"
37 #include "nativeInst_aarch32.hpp"
38 #include "oops/compiledICHolder.hpp"
39 #include "oops/oop.inline.hpp"
40 #include "prims/jvmtiExport.hpp"
41 #include "register_aarch32.hpp"
42 #include "runtime/sharedRuntime.hpp"
43 #include "runtime/signature.hpp"
44 #include "runtime/vframe.hpp"
45 #include "runtime/vframeArray.hpp"
46 #include "vmreg_aarch32.inline.hpp"
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
56 mov(c_rarg0, rthread);
57 set_num_rt_args(0); // Nothing on stack
58
59 Label retaddr;
60 set_last_Java_frame(sp, rfp, retaddr, rscratch1);
61
62 // do the call
63 lea(rscratch1, RuntimeAddress(entry));
64 bl(rscratch1);
65 bind(retaddr);
66 int call_offset = offset();
67 // verify callee-saved register
68 #ifdef ASSERT
69 push(r0, sp);
70 { Label L;
71 get_thread(r0);
72 cmp(rthread, r0);
73 b(L, Assembler::EQ);
74 stop("StubAssembler::call_RT: rthread not callee saved?");
75 bind(L);
76 }
77 pop(r0, sp);
78 #endif
79 reset_last_Java_frame(true);
80 maybe_isb();
81
82 // check for pending exceptions
83 { Label L;
84 // check for pending exceptions (java_thread is set upon return)
85 ldr(rscratch1, Address(rthread, in_bytes(Thread::pending_exception_offset())));
86 cbz(rscratch1, L);
87 mov(rscratch1, 0);
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(rscratch1, Address(rthread, JavaThread::vm_result_offset()));
92 }
93 if (metadata_result->is_valid()) {
94 str(rscratch1, 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 || arg2 == c_rarg3 ||
145 arg3 == c_rarg1 || arg3 == c_rarg2) {
146 push(arg2);
147 push(arg3);
148 push(arg1);
149 pop(c_rarg1);
150 pop(c_rarg3);
151 pop(c_rarg2);
152 } else {
153 mov(c_rarg1, arg1);
154 mov(c_rarg2, arg2);
155 mov(c_rarg3, arg3);
156 }
157 return call_RT(oop_result1, metadata_result, entry, 3);
158 }
159
160 // Implementation of StubFrame
161
162 class StubFrame: public StackObj {
163 private:
164 StubAssembler* _sasm;
165
166 public:
167 StubFrame(StubAssembler* sasm, const char* name, bool must_gc_arguments);
168 void load_argument(int offset_in_words, Register reg);
169
170 ~StubFrame();
171 };;
172
173 void StubAssembler::prologue(const char* name, bool must_gc_arguments) {
174 set_info(name, must_gc_arguments);
175 enter();
176 }
177
178 void StubAssembler::epilogue() {
179 leave();
180 ret(lr);
181 }
182
183 #define __ _sasm->
184
185 StubFrame::StubFrame(StubAssembler* sasm, const char* name, bool must_gc_arguments) {
186 _sasm = sasm;
187 __ prologue(name, must_gc_arguments);
188 }
189
190 // load parameters that were stored with LIR_Assembler::store_parameter
191 // Note: offsets for store_parameter and load_argument must match
192 void StubFrame::load_argument(int offset_in_words, Register reg) {
193 __ load_parameter(offset_in_words, reg);
194 }
195
196
197 StubFrame::~StubFrame() {
198 __ epilogue();
199 }
200
201 #undef __
202
203
204 // Implementation of Runtime1
205
206 #define __ sasm->
207
208
209 // Stack layout for saving/restoring all the registers needed during a runtime
210 // call (this includes deoptimization)
211 // Note: note that users of this frame may well have arguments to some runtime
212 // while these values are on the stack. These positions neglect those arguments
213 // but the code in save_live_registers will take the argument count into
214 // account.
215 //
216
217 enum reg_save_layout {
218 reg_save_s0,
219 reg_save_s31 = reg_save_s0 + FrameMap::nof_fpu_regs - 1,
220 reg_save_pad, // to align to doubleword to simplify conformance to APCS
221 reg_save_r0,
222 reg_save_r1,
223 reg_save_r2,
224 reg_save_r3,
225 reg_save_r4,
226 reg_save_r5,
227 reg_save_r6,
228 reg_save_r7,
229 reg_save_r8,
230 reg_save_r9,
231 reg_save_r10,
232 reg_save_r11,
233 reg_save_r12,
234 reg_save_frame_size
235 // remaining words pushed by enter
236 };
237
238 // Save off registers which might be killed by calls into the runtime.
239 // Tries to smart of about FP registers. In particular we separate
240 // saving and describing the FPU registers for deoptimization since we
241 // have to save the FPU registers twice if we describe them. The
242 // deopt blob is the only thing which needs to describe FPU registers.
243 // In all other cases it should be sufficient to simply save their
244 // current value.
245
246 static int cpu_reg_save_offsets[FrameMap::nof_cpu_regs];
247 static int fpu_reg_save_offsets[FrameMap::nof_fpu_regs];
248 static int reg_save_size_in_words;
249 static int frame_size_in_bytes = -1;
250
251 static OopMap* generate_oop_map(StubAssembler* sasm, bool save_fpu_registers) {
252 int frame_size_in_bytes = (reg_save_frame_size + frame::get_frame_size()) * BytesPerWord;
253 sasm->set_frame_size(frame_size_in_bytes / BytesPerWord);
254 int frame_size_in_slots = frame_size_in_bytes / sizeof(jint);
255 OopMap* oop_map = new OopMap(frame_size_in_slots, 0);
256
257 oop_map->set_callee_saved(VMRegImpl::stack2reg(reg_save_r0), r0->as_VMReg());
258 oop_map->set_callee_saved(VMRegImpl::stack2reg(reg_save_r1), r1->as_VMReg());
259 oop_map->set_callee_saved(VMRegImpl::stack2reg(reg_save_r2), r2->as_VMReg());
260 oop_map->set_callee_saved(VMRegImpl::stack2reg(reg_save_r3), r3->as_VMReg());
261 oop_map->set_callee_saved(VMRegImpl::stack2reg(reg_save_r4), r4->as_VMReg());
262 oop_map->set_callee_saved(VMRegImpl::stack2reg(reg_save_r5), r5->as_VMReg());
263 oop_map->set_callee_saved(VMRegImpl::stack2reg(reg_save_r6), r6->as_VMReg());
264 oop_map->set_callee_saved(VMRegImpl::stack2reg(reg_save_r7), r7->as_VMReg());
265 oop_map->set_callee_saved(VMRegImpl::stack2reg(reg_save_r8), r8->as_VMReg());
266 oop_map->set_callee_saved(VMRegImpl::stack2reg(reg_save_r9), r9->as_VMReg());
267 oop_map->set_callee_saved(VMRegImpl::stack2reg(reg_save_r10), r10->as_VMReg());
268 oop_map->set_callee_saved(VMRegImpl::stack2reg(reg_save_r11), r11->as_VMReg());
269 oop_map->set_callee_saved(VMRegImpl::stack2reg(reg_save_r12), r12->as_VMReg());
270 if (hasFPU()) {
271 for (int i = 0; i < FrameMap::nof_fpu_regs; ++i) {
272 oop_map->set_callee_saved(VMRegImpl::stack2reg(reg_save_s0 + i), as_FloatRegister(i)->as_VMReg());
273 }
274 }
275
276 return oop_map;
277 }
278
279 static OopMap* save_live_registers(StubAssembler* sasm,
280 bool save_fpu_registers = true) {
281 __ block_comment("save_live_registers");
282
283 __ push(RegSet::range(r0, r12), sp); // integer registers except lr & sp
284 __ sub(sp, sp, 4); // align to 8 bytes
285
286 if (save_fpu_registers && hasFPU()) {
287 __ vstmdb_f64(sp, (1 << FrameMap::nof_fpu_regs / 2) - 1);
288 } else {
289 __ sub(sp, sp, FrameMap::nof_fpu_regs * 4);
290 }
291
292 return generate_oop_map(sasm, save_fpu_registers);
293 }
294
295 static void restore_live_registers(StubAssembler* sasm, bool restore_fpu_registers = true) {
296
297 if (restore_fpu_registers && hasFPU()) {
298 __ vldmia_f64(sp, (1 << FrameMap::nof_fpu_regs / 2) - 1);
299 } else {
300 __ add(sp, sp, FrameMap::nof_fpu_regs * 4);
301 }
302
303 __ add(sp, sp, 4);
304 __ pop(RegSet::range(r0, r12), sp);
305 }
306
307 static void restore_live_registers_except_r0(StubAssembler* sasm, bool restore_fpu_registers = true) {
308
309 if (restore_fpu_registers && hasFPU()) {
310 __ vldmia_f64(sp, (1 << FrameMap::nof_fpu_regs / 2) - 1);
311 } else {
312 __ add(sp, sp, FrameMap::nof_fpu_regs * 4);
313 }
314
315 __ add(sp, sp, 8);
316 __ pop(RegSet::range(r1, r12), sp);
317 }
318
319 void Runtime1::initialize_pd() {
320 }
321
322 // target: the entry point of the method that creates and posts the exception oop
323 // has_argument: true if the exception needs arguments (passed in rscratch1 and rscratch2)
324
325 OopMapSet* Runtime1::generate_exception_throw(StubAssembler* sasm, address target, bool has_argument) {
326 // make a frame and preserve the caller's caller-save registers
327 OopMap* oop_map = save_live_registers(sasm);
328 int call_offset;
329 if (!has_argument) {
330 call_offset = __ call_RT(noreg, noreg, target);
331 } else {
332 call_offset = __ call_RT(noreg, noreg, target, rscratch1, rscratch2);
333 }
334 OopMapSet* oop_maps = new OopMapSet();
335 oop_maps->add_gc_map(call_offset, oop_map);
336
337 __ should_not_reach_here();
338 return oop_maps;
339 }
340
341
342 OopMapSet* Runtime1::generate_handle_exception(StubID id, StubAssembler *sasm) {
343 __ block_comment("generate_handle_exception");
344
345 // incoming parameters
346 const Register exception_oop = r0;
347 const Register exception_pc = r3;
348 // other registers used in this stub
349
350 // Save registers, if required.
351 OopMapSet* oop_maps = new OopMapSet();
352 OopMap* oop_map = NULL;
353 switch (id) {
354 case forward_exception_id:
355 // We're handling an exception in the context of a compiled frame.
356 // The registers have been saved in the standard places. Perform
357 // an exception lookup in the caller and dispatch to the handler
358 // if found. Otherwise unwind and dispatch to the callers
359 // exception handler.
360 oop_map = generate_oop_map(sasm, 1 /*thread*/);
361 __ mov(rscratch1, 0);
362
363 // load and clear pending exception oop into r0
364 __ ldr(exception_oop, Address(rthread, Thread::pending_exception_offset()));
365 __ str(rscratch1, Address(rthread, Thread::pending_exception_offset()));
366
367 // load issuing PC (the return address for this stub) into r3
368 __ ldr(exception_pc, Address(rfp, wordSize * frame::get_return_addr_offset()));
369
370 // make sure that the vm_results are cleared (may be unnecessary)
371 __ str(rscratch1, Address(rthread, JavaThread::vm_result_offset()));
372 __ str(rscratch1, Address(rthread, JavaThread::vm_result_2_offset()));
373 break;
374 case handle_exception_nofpu_id:
375 case handle_exception_id:
376 // At this point all registers MAY be live.
377 oop_map = save_live_registers(sasm, id != handle_exception_nofpu_id);
378 break;
379 case handle_exception_from_callee_id: {
380 // At this point all registers except exception oop (r0) and
381 // exception pc (lr) are dead.
382 const int frame_size = frame::get_frame_size() /*fp, return address, ...*/;
383 assert(frame_size*wordSize % StackAlignmentInBytes == 0, "must be");
384 oop_map = new OopMap(frame_size * VMRegImpl::slots_per_word, 0);
385 sasm->set_frame_size(frame_size);
386 break;
387 }
388 default:
389 __ should_not_reach_here();
390 break;
391 }
392
393 // verify that only r0 and r3 are valid at this time
394 __ invalidate_registers(false, true, false);
395 // verify that r0 contains a valid exception
396 __ verify_not_null_oop(exception_oop);
397
398 #ifdef ASSERT
399 // check that fields in JavaThread for exception oop and issuing pc are
400 // empty before writing to them
401 Label oop_empty;
402 __ ldr(rscratch1, Address(rthread, JavaThread::exception_oop_offset()));
403 __ cbz(rscratch1, oop_empty);
404 __ stop("exception oop already set");
405 __ bind(oop_empty);
406
407 Label pc_empty;
408 __ ldr(rscratch1, Address(rthread, JavaThread::exception_pc_offset()));
409 __ cbz(rscratch1, pc_empty);
410 __ stop("exception pc already set");
411 __ bind(pc_empty);
412 #endif
413
414 // save exception oop and issuing pc into JavaThread
415 // (exception handler will load it from here)
416 __ str(exception_oop, Address(rthread, JavaThread::exception_oop_offset()));
417 __ str(exception_pc, Address(rthread, JavaThread::exception_pc_offset()));
418
419 // patch throwing pc into return address (has bci & oop map)
420 __ str(exception_pc, Address(rfp, wordSize * frame::get_return_addr_offset()));
421
422 // compute the exception handler.
423 // the exception oop and the throwing pc are read from the fields in JavaThread
424 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, exception_handler_for_pc));
425 oop_maps->add_gc_map(call_offset, oop_map);
426
427 // r0: handler address
428 // will be the deopt blob if nmethod was deoptimized while we looked up
429 // handler regardless of whether handler existed in the nmethod.
430
431 // only r0 is valid at this time, all other registers have been destroyed by the runtime call
432 __ invalidate_registers(false, true, true);
433
434 // patch the return address, this stub will directly return to the exception handler
435 __ str(r0, Address(rfp, wordSize * frame::get_return_addr_offset()));
436
437 switch (id) {
438 case forward_exception_id:
439 case handle_exception_nofpu_id:
440 case handle_exception_id:
441 // Restore the registers that were saved at the beginning.
442 restore_live_registers(sasm, id != handle_exception_nofpu_id);
443 break;
444 case handle_exception_from_callee_id:
445 // Pop the return address.
446 __ leave();
447 __ ret(lr); // jump to exception handler
448 break;
449 default: ShouldNotReachHere();
450 }
451
452 return oop_maps;
453 }
454
455
456 void Runtime1::generate_unwind_exception(StubAssembler *sasm) {
457 // incoming parameters
458 const Register exception_oop = r0;
459 // other registers used in this stub
460 const Register exception_pc = r3;
461 const Register handler_addr = r1;
462
463 // verify that only r0, is valid at this time
464 __ invalidate_registers(false, true, true);
465
466 #ifdef ASSERT
467 // check that fields in JavaThread for exception oop and issuing pc are empty
468 Label oop_empty;
469 __ ldr(rscratch1, Address(rthread, JavaThread::exception_oop_offset()));
470 __ cbz(rscratch1, oop_empty);
471 __ stop("exception oop must be empty");
472 __ bind(oop_empty);
473
474 Label pc_empty;
475 __ ldr(rscratch1, Address(rthread, JavaThread::exception_pc_offset()));
476 __ cbz(rscratch1, pc_empty);
477 __ stop("exception pc must be empty");
478 __ bind(pc_empty);
479 #endif
480
481 // Save our return address because
482 // exception_handler_for_return_address will destroy it. We also
483 // save exception_oop
484 __ push(exception_oop);
485 __ push(lr);
486
487 // search the exception handler address of the caller (using the return address)
488 __ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::exception_handler_for_return_address), rthread, lr);
489 // r0: exception handler address of the caller
490
491 // Only R0 is valid at this time; all other registers have been
492 // destroyed by the call.
493 __ invalidate_registers(false, true, true);
494
495 // move result of call into correct register
496 __ mov(handler_addr, r0);
497
498 // get throwing pc (= return address).
499 // lr has been destroyed by the call
500 __ pop(lr);
501 __ pop(exception_oop);
502 __ mov(r3, lr);
503
504 __ verify_not_null_oop(exception_oop);
505
506 // continue at exception handler (return address removed)
507 // note: do *not* remove arguments when unwinding the
508 // activation since the caller assumes having
509 // all arguments on the stack when entering the
510 // runtime to determine the exception handler
511 // (GC happens at call site with arguments!)
512 // r0: exception oop
513 // r3: throwing pc
514 // r1: exception handler
515 __ b(handler_addr);
516 }
517
518
519
520 OopMapSet* Runtime1::generate_patching(StubAssembler* sasm, address target) {
521 // use the maximum number of runtime-arguments here because it is difficult to
522 // distinguish each RT-Call.
523 // Note: This number affects also the RT-Call in generate_handle_exception because
524 // the oop-map is shared for all calls.
525 DeoptimizationBlob* deopt_blob = SharedRuntime::deopt_blob();
526 assert(deopt_blob != NULL, "deoptimization blob must have been created");
527
528 OopMap* oop_map = save_live_registers(sasm);
529
530 __ mov(c_rarg0, rthread);
531 Label retaddr;
532 __ set_last_Java_frame(sp, rfp, retaddr, rscratch1);
533 // do the call
534 __ lea(rscratch1, RuntimeAddress(target));
535 __ bl(rscratch1);
536 __ bind(retaddr);
537 OopMapSet* oop_maps = new OopMapSet();
538 oop_maps->add_gc_map(__ offset(), oop_map);
539 // verify callee-saved register
540 #ifdef ASSERT
541 { Label L;
542 __ get_thread(rscratch1);
543 __ cmp(rthread, rscratch1);
544 __ b(L, Assembler::EQ);
545 __ stop("StubAssembler::call_RT: rthread not callee saved?");
546 __ bind(L);
547 }
548 #endif
549 __ reset_last_Java_frame(true);
550 __ maybe_isb();
551
552 // check for pending exceptions
553 { Label L;
554 __ ldr(rscratch1, Address(rthread, Thread::pending_exception_offset()));
555 __ cbz(rscratch1, L);
556 // exception pending => remove activation and forward to exception handler
557
558 { Label L1;
559 __ cbnz(r0, L1); // have we deoptimized?
560 __ far_jump(RuntimeAddress(Runtime1::entry_for(Runtime1::forward_exception_id)));
561 __ bind(L1);
562 }
563
564 // the deopt blob expects exceptions in the special fields of
565 // JavaThread, so copy and clear pending exception.
566
567 // load and clear pending exception
568 __ ldr(r0, Address(rthread, Thread::pending_exception_offset()));
569 __ mov(rscratch1, 0);
570 __ str(rscratch1, Address(rthread, Thread::pending_exception_offset()));
571
572 // check that there is really a valid exception
573 __ verify_not_null_oop(r0);
574
575 // load throwing pc: this is the return address of the stub
576 __ ldr(r3, Address(rfp, wordSize * frame::get_return_addr_offset()));
577
578 #ifdef ASSERT
579 // check that fields in JavaThread for exception oop and issuing pc are empty
580 Label oop_empty;
581 __ ldr(rscratch1, Address(rthread, Thread::pending_exception_offset()));
582 __ cbz(rscratch1, oop_empty);
583 __ stop("exception oop must be empty");
584 __ bind(oop_empty);
585
586 Label pc_empty;
587 __ ldr(rscratch1, Address(rthread, JavaThread::exception_pc_offset()));
588 __ cbz(rscratch1, pc_empty);
589 __ stop("exception pc must be empty");
590 __ bind(pc_empty);
591 #endif
592
593 // store exception oop and throwing pc to JavaThread
594 __ str(r0, Address(rthread, JavaThread::exception_oop_offset()));
595 __ str(r3, Address(rthread, JavaThread::exception_pc_offset()));
596
597 restore_live_registers(sasm);
598
599 __ leave();
600
601 // Forward the exception directly to deopt blob. We can blow no
602 // registers and must leave throwing pc on the stack. A patch may
603 // have values live in registers so the entry point with the
604 // exception in tls.
605 __ far_jump(RuntimeAddress(deopt_blob->unpack_with_exception_in_tls()));
606
607 __ bind(L);
608 }
609
610
611 // Runtime will return true if the nmethod has been deoptimized during
612 // the patching process. In that case we must do a deopt reexecute instead.
613
614 Label reexecuteEntry, cont;
615
616 __ cbz(r0, cont); // have we deoptimized?
617
618 // Will reexecute. Proper return address is already on the stack we just restore
619 // registers, pop all of our frame but the return address and jump to the deopt blob
620 restore_live_registers(sasm);
621 __ leave();
622 __ far_jump(RuntimeAddress(deopt_blob->unpack_with_reexecution()));
623
624 __ bind(cont);
625 restore_live_registers(sasm);
626 __ leave();
627 __ ret(lr);
628
629 return oop_maps;
630 }
631
632
633 OopMapSet* Runtime1::generate_code_for(StubID id, StubAssembler* sasm) {
634
635 const Register exception_oop = r0;
636 const Register exception_pc = r3;
637
638 // for better readability
639 const bool must_gc_arguments = true;
640 const bool dont_gc_arguments = false;
641
642 // default value; overwritten for some optimized stubs that are called from methods that do not use the fpu
643 bool save_fpu_registers = true;
644
645 // stub code & info for the different stubs
646 OopMapSet* oop_maps = NULL;
647 OopMap* oop_map = NULL;
648 switch (id) {
649 {
650 case forward_exception_id:
651 {
652 oop_maps = generate_handle_exception(id, sasm);
653 __ leave();
654 __ ret(lr);
655 }
656 break;
657
658 case throw_div0_exception_id:
659 { StubFrame f(sasm, "throw_div0_exception", dont_gc_arguments);
660 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_div0_exception), false);
661 }
662 break;
663
664 case throw_null_pointer_exception_id:
665 { StubFrame f(sasm, "throw_null_pointer_exception", dont_gc_arguments);
666 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_null_pointer_exception), false);
667 }
668 break;
669
670 case new_instance_id:
671 case fast_new_instance_id:
672 case fast_new_instance_init_check_id:
673 {
674 Register klass = r3; // Incoming
675 Register obj = r0; // Result
676
677 if (id == new_instance_id) {
678 __ set_info("new_instance", dont_gc_arguments);
679 } else if (id == fast_new_instance_id) {
680 __ set_info("fast new_instance", dont_gc_arguments);
681 } else {
682 assert(id == fast_new_instance_init_check_id, "bad StubID");
683 __ set_info("fast new_instance init check", dont_gc_arguments);
684 }
685
686 // If TLAB is disabled, see if there is support for inlining contiguous
687 // allocations.
688 // Otherwise, just go to the slow path.
689 if ((id == fast_new_instance_id || id == fast_new_instance_init_check_id) &&
690 !UseTLAB && Universe::heap()->supports_inline_contig_alloc()) {
691 Label slow_path;
692 Register obj_size = r2;
693 Register t1 = r5;
694 Register t2 = r4;
695 assert_different_registers(klass, obj, obj_size, t1, t2);
696
697 __ push(t1);
698 __ push(t2);
699 if (id == fast_new_instance_init_check_id) {
700 // make sure the klass is initialized
701 __ ldrb(rscratch1, Address(klass, InstanceKlass::init_state_offset()));
702 __ cmp(rscratch1, InstanceKlass::fully_initialized);
703 __ b(slow_path, Assembler::NE);
704 }
705
706 #ifdef ASSERT
707 // assert object can be fast path allocated
708 {
709 Label ok, not_ok;
710 __ ldr(obj_size, Address(klass, Klass::layout_helper_offset()));
711 __ cmp(obj_size, 0u);
712 __ b(not_ok, Assembler::LE); // Make sure it's an instance (layout helper is positive)
713 __ tst(obj_size, Klass::_lh_instance_slow_path_bit);
714 __ b(ok, Assembler::EQ);
715 __ bind(not_ok);
716 __ stop("assert(can be fast path allocated)");
717 __ should_not_reach_here();
718 __ bind(ok);
719 }
720 #endif // ASSERT
721
722 // get the instance size
723 __ ldr(obj_size, Address(klass, Klass::layout_helper_offset()));
724
725 __ eden_allocate(obj, obj_size, 0, t1, slow_path);
726
727 __ initialize_object(obj, klass, obj_size, 0, t1, t2, /* is_tlab_allocated */ false);
728 __ verify_oop(obj);
729 __ pop(t2);
730 __ pop(t1);
731 __ ret(lr);
732
733 __ bind(slow_path);
734 __ pop(t2);
735 __ pop(t1);
736 }
737
738 __ enter();
739 OopMap* map = save_live_registers(sasm);
740 int call_offset = __ call_RT(obj, noreg, CAST_FROM_FN_PTR(address, new_instance), klass);
741 oop_maps = new OopMapSet();
742 oop_maps->add_gc_map(call_offset, map);
743 restore_live_registers_except_r0(sasm);
744 __ verify_oop(obj);
745 __ leave();
746 __ ret(lr);
747
748 // r0,: new instance
749 }
750
751 break;
752
753 case counter_overflow_id:
754 {
755 Register bci = r0, method = r1;
756 __ enter();
757 OopMap* map = save_live_registers(sasm);
758 // Retrieve bci
759 __ ldr(bci, Address(rfp, 1*BytesPerWord));
760 // And a pointer to the Method*
761 __ ldr(method, Address(rfp, 2*BytesPerWord));
762 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, counter_overflow), bci, method);
763 oop_maps = new OopMapSet();
764 oop_maps->add_gc_map(call_offset, map);
765 restore_live_registers(sasm);
766 __ leave();
767 __ ret(lr);
768 }
769 break;
770
771 case new_type_array_id:
772 case new_object_array_id:
773 {
774 Register length = r6; // Incoming
775 Register klass = r3; // Incoming
776 Register obj = r0; // Result
777
778 if (id == new_type_array_id) {
779 __ set_info("new_type_array", dont_gc_arguments);
780 } else {
781 __ set_info("new_object_array", dont_gc_arguments);
782 }
783
784 #ifdef ASSERT
785 // assert object type is really an array of the proper kind
786 {
787 Label ok;
788 Register t0 = obj;
789 __ ldr(t0, Address(klass, Klass::layout_helper_offset()));
790 __ asr(t0, t0, Klass::_lh_array_tag_shift);
791 int tag = ((id == new_type_array_id)
792 ? Klass::_lh_array_tag_type_value
793 : Klass::_lh_array_tag_obj_value);
794 __ mov(rscratch1, tag);
795 __ cmp(t0, rscratch1);
796 __ b(ok, Assembler::EQ);
797 __ stop("assert(is an array klass)");
798 __ should_not_reach_here();
799 __ bind(ok);
800 }
801 #endif // ASSERT
802
803 // If TLAB is disabled, see if there is support for inlining contiguous
804 // allocations.
805 // Otherwise, just go to the slow path.
806 if (!UseTLAB && Universe::heap()->supports_inline_contig_alloc()) {
807 Register arr_size = r4;
808 Register t1 = r2;
809 Register t2 = r5;
810 Label slow_path;
811 assert_different_registers(length, klass, obj, arr_size, t1, t2);
812
813 // check that array length is small enough for fast path.
814 __ mov(rscratch1, C1_MacroAssembler::max_array_allocation_length);
815 __ cmp(length, rscratch1);
816 __ b(slow_path, Assembler::HI);
817
818 // get the allocation size: round_up(hdr + length << (layout_helper & 0x1F))
819 __ ldr(t1, Address(klass, Klass::layout_helper_offset()));
820 __ andr(rscratch1, t1, 0x1f);
821 __ lsl(arr_size, length, rscratch1);
822 __ extract_bits(t1, t1, Klass::_lh_header_size_shift,
823 exact_log2(Klass::_lh_header_size_mask + 1));
824 __ add(arr_size, arr_size, t1);
825 __ add(arr_size, arr_size, MinObjAlignmentInBytesMask); // align up
826 __ mov(rscratch1, ~MinObjAlignmentInBytesMask);
827 __ andr(arr_size, arr_size, rscratch1);
828
829 __ eden_allocate(obj, arr_size, 0, t1, slow_path); // preserves arr_size
830
831 __ initialize_header(obj, klass, length, t1, t2);
832 // Assume Little-Endian
833 __ ldrb(t1, Address(klass, in_bytes(Klass::layout_helper_offset()) + (Klass::_lh_header_size_shift / BitsPerByte)));
834 assert(Klass::_lh_header_size_shift % BitsPerByte == 0, "bytewise");
835 assert(Klass::_lh_header_size_mask <= 0xFF, "bytewise");
836 __ andr(t1, t1, Klass::_lh_header_size_mask);
837 __ sub(arr_size, arr_size, t1); // body length
838 __ add(t1, t1, obj); // body start
839 __ initialize_body(t1, arr_size, 0, t2);
840 __ verify_oop(obj);
841
842 __ ret(lr);
843
844 __ bind(slow_path);
845 }
846
847 __ enter();
848 OopMap* map = save_live_registers(sasm);
849 int call_offset;
850 if (id == new_type_array_id) {
851 call_offset = __ call_RT(obj, noreg, CAST_FROM_FN_PTR(address, new_type_array), klass, length);
852 } else {
853 call_offset = __ call_RT(obj, noreg, CAST_FROM_FN_PTR(address, new_object_array), klass, length);
854 }
855
856 oop_maps = new OopMapSet();
857 oop_maps->add_gc_map(call_offset, map);
858 restore_live_registers_except_r0(sasm);
859
860 __ verify_oop(obj);
861 __ leave();
862 __ ret(lr);
863
864 // r0: new array
865 }
866 break;
867
868 case new_multi_array_id:
869 { StubFrame f(sasm, "new_multi_array", dont_gc_arguments);
870 // r1: klass
871 // r2: rank
872 // r3: address of 1st dimension
873 OopMap* map = save_live_registers(sasm);
874 int call_offset = __ call_RT(r0, noreg, CAST_FROM_FN_PTR(address, new_multi_array), r1, r2, r3);
875
876 oop_maps = new OopMapSet();
877 oop_maps->add_gc_map(call_offset, map);
878 restore_live_registers_except_r0(sasm);
879
880 // r0,: new multi array
881 __ verify_oop(r0);
882 }
883 break;
884
885 case register_finalizer_id:
886 {
887 __ set_info("register_finalizer", dont_gc_arguments);
888
889 // This is called via call_runtime so the arguments
890 // will be place in C abi locations
891
892 __ verify_oop(c_rarg0);
893
894 // load the klass and check the has finalizer flag
895 Label register_finalizer;
896 Register t = r5;
897 __ load_klass(t, r0);
898 __ ldr(t, Address(t, Klass::access_flags_offset()));
899 __ tst(t, JVM_ACC_HAS_FINALIZER);
900 __ b(register_finalizer, Assembler::NE);
901 __ ret(lr);
902
903 __ bind(register_finalizer);
904 __ enter();
905 OopMap* oop_map = save_live_registers(sasm);
906 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, SharedRuntime::register_finalizer), r0);
907 oop_maps = new OopMapSet();
908 oop_maps->add_gc_map(call_offset, oop_map);
909
910 // Now restore all the live registers
911 restore_live_registers(sasm);
912
913 __ leave();
914 __ ret(lr);
915 }
916 break;
917
918 case throw_class_cast_exception_id:
919 { StubFrame f(sasm, "throw_class_cast_exception", dont_gc_arguments);
920 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_class_cast_exception), true);
921 }
922 break;
923
924 case throw_incompatible_class_change_error_id:
925 { StubFrame f(sasm, "throw_incompatible_class_cast_exception", dont_gc_arguments);
926 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_incompatible_class_change_error), false);
927 }
928 break;
929
930 case slow_subtype_check_id:
931 {
932 // Typical calling sequence:
933 // __ push(klass_RInfo); // object klass or other subclass
934 // __ push(sup_k_RInfo); // array element klass or other superclass
935 // __ bl(slow_subtype_check);
936 // Note that the subclass is pushed first, and is therefore deepest.
937 enum layout {
938 r0_off,
939 r2_off,
940 r4_off,
941 r5_off,
942 sup_k_off,
943 klass_off,
944 framesize,
945 result_off = sup_k_off
946 };
947
948 __ set_info("slow_subtype_check", dont_gc_arguments);
949 __ push(RegSet::of(r0, r2, r4, r5), sp);
950
951 // This is called by pushing args and not with C abi
952 __ ldr(r4, Address(sp, (klass_off) * VMRegImpl::stack_slot_size)); // subclass
953 __ ldr(r0, Address(sp, (sup_k_off) * VMRegImpl::stack_slot_size)); // superclass
954
955
956 Label miss;
957 __ check_klass_subtype_slow_path(r4, r0, r2, r5, NULL, &miss);
958
959 // fallthrough on success:
960 __ mov(rscratch1, 1);
961 __ str(rscratch1, Address(sp, (result_off) * VMRegImpl::stack_slot_size)); // result
962 __ pop(RegSet::of(r0, r2, r4, r5), sp);
963 __ ret(lr);
964
965 __ bind(miss);
966 __ mov(rscratch1, 0);
967 __ str(rscratch1, Address(sp, (result_off) * VMRegImpl::stack_slot_size)); // result
968 __ pop(RegSet::of(r0, r2, r4, r5), sp);
969 __ ret(lr);
970 }
971 break;
972
973 case monitorenter_nofpu_id:
974 save_fpu_registers = false;
975 // fall through
976 case monitorenter_id:
977 {
978 StubFrame f(sasm, "monitorenter", dont_gc_arguments);
979 OopMap* map = save_live_registers(sasm, save_fpu_registers);
980
981 // Called with store_parameter and not C abi
982
983 f.load_argument(1, r0); // r0,: object
984 f.load_argument(0, r1); // r1,: lock address
985
986 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, monitorenter), r0, r1);
987
988 oop_maps = new OopMapSet();
989 oop_maps->add_gc_map(call_offset, map);
990 restore_live_registers(sasm, save_fpu_registers);
991 }
992 break;
993
994 case monitorexit_nofpu_id:
995 save_fpu_registers = false;
996 // fall through
997 case monitorexit_id:
998 {
999 StubFrame f(sasm, "monitorexit", dont_gc_arguments);
1000 OopMap* map = save_live_registers(sasm, save_fpu_registers);
1001
1002 // Called with store_parameter and not C abi
1003
1004 f.load_argument(0, r0); // r0,: lock address
1005
1006 // note: really a leaf routine but must setup last java sp
1007 // => use call_RT for now (speed can be improved by
1008 // doing last java sp setup manually)
1009 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, monitorexit), r0);
1010
1011 oop_maps = new OopMapSet();
1012 oop_maps->add_gc_map(call_offset, map);
1013 restore_live_registers(sasm, save_fpu_registers);
1014 }
1015 break;
1016
1017 case deoptimize_id:
1018 {
1019 StubFrame f(sasm, "deoptimize", dont_gc_arguments);
1020 OopMap* oop_map = save_live_registers(sasm);
1021 f.load_argument(0, c_rarg1);
1022 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, deoptimize), c_rarg1);
1023
1024 oop_maps = new OopMapSet();
1025 oop_maps->add_gc_map(call_offset, oop_map);
1026 restore_live_registers(sasm);
1027 DeoptimizationBlob* deopt_blob = SharedRuntime::deopt_blob();
1028 assert(deopt_blob != NULL, "deoptimization blob must have been created");
1029 __ leave();
1030 __ far_jump(RuntimeAddress(deopt_blob->unpack_with_reexecution()));
1031 }
1032 break;
1033
1034 case throw_range_check_failed_id:
1035 { StubFrame f(sasm, "range_check_failed", dont_gc_arguments);
1036 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_range_check_exception), true);
1037 }
1038 break;
1039
1040 case unwind_exception_id:
1041 { __ set_info("unwind_exception", dont_gc_arguments);
1042 // note: no stubframe since we are about to leave the current
1043 // activation and we are calling a leaf VM function only.
1044 generate_unwind_exception(sasm);
1045 }
1046 break;
1047
1048 case access_field_patching_id:
1049 { StubFrame f(sasm, "access_field_patching", dont_gc_arguments);
1050 // we should set up register map
1051 oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, access_field_patching));
1052 }
1053 break;
1054
1055 case load_klass_patching_id:
1056 { StubFrame f(sasm, "load_klass_patching", dont_gc_arguments);
1057 // we should set up register map
1058 oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, move_klass_patching));
1059 }
1060 break;
1061
1062 case load_mirror_patching_id:
1063 { StubFrame f(sasm, "load_mirror_patching", dont_gc_arguments);
1064 // we should set up register map
1065 oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, move_mirror_patching));
1066 }
1067 break;
1068
1069 case load_appendix_patching_id:
1070 { StubFrame f(sasm, "load_appendix_patching", dont_gc_arguments);
1071 // we should set up register map
1072 oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, move_appendix_patching));
1073 }
1074 break;
1075
1076 case handle_exception_nofpu_id:
1077 case handle_exception_id:
1078 { StubFrame f(sasm, "handle_exception", dont_gc_arguments);
1079 oop_maps = generate_handle_exception(id, sasm);
1080 }
1081 break;
1082
1083 case handle_exception_from_callee_id:
1084 { StubFrame f(sasm, "handle_exception_from_callee", dont_gc_arguments);
1085 oop_maps = generate_handle_exception(id, sasm);
1086 }
1087 break;
1088
1089 case throw_index_exception_id:
1090 { StubFrame f(sasm, "index_range_check_failed", dont_gc_arguments);
1091 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_index_exception), true);
1092 }
1093 break;
1094
1095 case throw_array_store_exception_id:
1096 { StubFrame f(sasm, "throw_array_store_exception", dont_gc_arguments);
1097 // tos + 0: link
1098 // + 1: return address
1099 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_array_store_exception), true);
1100 }
1101 break;
1102
1103 case predicate_failed_trap_id:
1104 {
1105 StubFrame f(sasm, "predicate_failed_trap", dont_gc_arguments);
1106
1107 OopMap* map = save_live_registers(sasm);
1108
1109 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, predicate_failed_trap));
1110 oop_maps = new OopMapSet();
1111 oop_maps->add_gc_map(call_offset, map);
1112 restore_live_registers(sasm);
1113 __ leave();
1114 DeoptimizationBlob* deopt_blob = SharedRuntime::deopt_blob();
1115 assert(deopt_blob != NULL, "deoptimization blob must have been created");
1116
1117 __ far_jump(RuntimeAddress(deopt_blob->unpack_with_reexecution()));
1118 }
1119 break;
1120
1121
1122 default:
1123 { StubFrame f(sasm, "unimplemented entry", dont_gc_arguments);
1124 __ mov(r0, (int)id);
1125 __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, unimplemented_entry), r0);
1126 __ should_not_reach_here();
1127 }
1128 break;
1129 }
1130 }
1131 return oop_maps;
1132 }
1133
1134 #undef __
1135
1136 const char *Runtime1::pd_name_for_address(address entry) {
1137 #ifdef __SOFTFP__
1138 #define FUNCTION_CASE(a, f) \
1139 if ((intptr_t)a == CAST_FROM_FN_PTR(intptr_t, f)) return #f
1140
1141 FUNCTION_CASE(entry, SharedRuntime::i2f);
1142 FUNCTION_CASE(entry, SharedRuntime::i2d);
1143 FUNCTION_CASE(entry, SharedRuntime::f2d);
1144 FUNCTION_CASE(entry, SharedRuntime::fcmpg);
1145 FUNCTION_CASE(entry, SharedRuntime::fcmpl);
1146 FUNCTION_CASE(entry, SharedRuntime::dcmpg);
1147 FUNCTION_CASE(entry, SharedRuntime::dcmpl);
1148 FUNCTION_CASE(entry, SharedRuntime::unordered_fcmple);
1149 FUNCTION_CASE(entry, SharedRuntime::unordered_dcmple);
1150 #undef FUNCTION_CASE
1151 #endif
1152
1153 return "Unknown_Func_Ptr";
1154 }