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 "memory/universe.hpp"
37 #include "nativeInst_aarch64.hpp"
38 #include "oops/compiledICHolder.hpp"
39 #include "oops/oop.inline.hpp"
40 #include "prims/jvmtiExport.hpp"
41 #include "register_aarch64.hpp"
42 #include "runtime/sharedRuntime.hpp"
43 #include "runtime/signature.hpp"
44 #include "runtime/vframe.hpp"
45 #include "runtime/vframeArray.hpp"
46 #include "vmreg_aarch64.inline.hpp"
47
48
49 // Implementation of StubAssembler
50
51 int StubAssembler::call_RT(Register oop_result1, Register metadata_result, address entry, int args_size) {
52 // setup registers
53 assert(!(oop_result1->is_valid() || metadata_result->is_valid()) || oop_result1 != metadata_result, "registers must be different");
54 assert(oop_result1 != rthread && metadata_result != rthread, "registers must be different");
55 assert(args_size >= 0, "illegal args_size");
56 bool align_stack = false;
57
58 mov(c_rarg0, rthread);
59 set_num_rt_args(0); // Nothing on stack
60
61 Label retaddr;
62 set_last_Java_frame(sp, rfp, retaddr, rscratch1);
63
64 // do the call
65 lea(rscratch1, RuntimeAddress(entry));
66 blrt(rscratch1, args_size + 1, 8, 1);
67 bind(retaddr);
68 int call_offset = offset();
69 // verify callee-saved register
70 #ifdef ASSERT
71 push(r0, sp);
72 { Label L;
73 get_thread(r0);
74 cmp(rthread, r0);
75 br(Assembler::EQ, L);
76 stop("StubAssembler::call_RT: rthread not callee saved?");
77 bind(L);
78 }
79 pop(r0, sp);
80 #endif
81 reset_last_Java_frame(true);
82 maybe_isb();
83
84 // check for pending exceptions
85 { Label L;
86 // check for pending exceptions (java_thread is set upon return)
87 ldr(rscratch1, Address(rthread, in_bytes(Thread::pending_exception_offset())));
88 cbz(rscratch1, L);
89 // exception pending => remove activation and forward to exception handler
90 // make sure that the vm_results are cleared
91 if (oop_result1->is_valid()) {
92 str(zr, Address(rthread, JavaThread::vm_result_offset()));
93 }
94 if (metadata_result->is_valid()) {
95 str(zr, Address(rthread, JavaThread::vm_result_2_offset()));
96 }
97 if (frame_size() == no_frame_size) {
98 leave();
99 far_jump(RuntimeAddress(StubRoutines::forward_exception_entry()));
100 } else if (_stub_id == Runtime1::forward_exception_id) {
101 should_not_reach_here();
102 } else {
103 far_jump(RuntimeAddress(Runtime1::entry_for(Runtime1::forward_exception_id)));
104 }
105 bind(L);
106 }
107 // get oop results if there are any and reset the values in the thread
108 if (oop_result1->is_valid()) {
109 get_vm_result(oop_result1, rthread);
110 }
111 if (metadata_result->is_valid()) {
112 get_vm_result_2(metadata_result, rthread);
113 }
114 return call_offset;
115 }
116
117
118 int StubAssembler::call_RT(Register oop_result1, Register metadata_result, address entry, Register arg1) {
119 mov(c_rarg1, arg1);
120 return call_RT(oop_result1, metadata_result, entry, 1);
121 }
122
123
124 int StubAssembler::call_RT(Register oop_result1, Register metadata_result, address entry, Register arg1, Register arg2) {
125 if (c_rarg1 == arg2) {
126 if (c_rarg2 == arg1) {
127 mov(rscratch1, arg1);
128 mov(arg1, arg2);
129 mov(arg2, rscratch1);
130 } else {
131 mov(c_rarg2, arg2);
132 mov(c_rarg1, arg1);
133 }
134 } else {
135 mov(c_rarg1, arg1);
136 mov(c_rarg2, arg2);
137 }
138 return call_RT(oop_result1, metadata_result, entry, 2);
139 }
140
141
142 int StubAssembler::call_RT(Register oop_result1, Register metadata_result, address entry, Register arg1, Register arg2, Register arg3) {
143 // if there is any conflict use the stack
144 if (arg1 == c_rarg2 || arg1 == c_rarg3 ||
145 arg2 == c_rarg1 || arg1 == c_rarg3 ||
146 arg3 == c_rarg1 || arg1 == c_rarg2) {
147 stp(arg3, arg2, Address(pre(sp, 2 * wordSize)));
148 stp(arg1, zr, Address(pre(sp, -2 * wordSize)));
149 ldp(c_rarg1, zr, Address(post(sp, 2 * wordSize)));
150 ldp(c_rarg3, c_rarg2, Address(post(sp, 2 * wordSize)));
151 } else {
152 mov(c_rarg1, arg1);
153 mov(c_rarg2, arg2);
154 mov(c_rarg3, arg3);
155 }
156 return call_RT(oop_result1, metadata_result, entry, 3);
157 }
158
159 // Implementation of StubFrame
160
161 class StubFrame: public StackObj {
162 private:
163 StubAssembler* _sasm;
164
165 public:
166 StubFrame(StubAssembler* sasm, const char* name, bool must_gc_arguments);
167 void load_argument(int offset_in_words, Register reg);
168
169 ~StubFrame();
170 };;
171
172 void StubAssembler::prologue(const char* name, bool must_gc_arguments) {
173 set_info(name, must_gc_arguments);
174 enter();
175 }
176
177 void StubAssembler::epilogue() {
178 leave();
179 ret(lr);
180 }
181
182 #define __ _sasm->
183
184 StubFrame::StubFrame(StubAssembler* sasm, const char* name, bool must_gc_arguments) {
185 _sasm = sasm;
186 __ prologue(name, must_gc_arguments);
187 }
188
189 // load parameters that were stored with LIR_Assembler::store_parameter
190 // Note: offsets for store_parameter and load_argument must match
191 void StubFrame::load_argument(int offset_in_words, Register reg) {
192 __ load_parameter(offset_in_words, reg);
193 }
194
195
196 StubFrame::~StubFrame() {
197 __ epilogue();
198 }
199
200 #undef __
201
202
203 // Implementation of Runtime1
204
205 #define __ sasm->
206
207 const int float_regs_as_doubles_size_in_slots = pd_nof_fpu_regs_frame_map * 2;
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_frame_size = 32 /* float */ + 32 /* integer */
219 };
220
221 // Save off registers which might be killed by calls into the runtime.
222 // Tries to smart of about FP registers. In particular we separate
223 // saving and describing the FPU registers for deoptimization since we
224 // have to save the FPU registers twice if we describe them. The
225 // deopt blob is the only thing which needs to describe FPU registers.
226 // In all other cases it should be sufficient to simply save their
227 // current value.
228
229 static int cpu_reg_save_offsets[FrameMap::nof_cpu_regs];
230 static int fpu_reg_save_offsets[FrameMap::nof_fpu_regs];
231 static int reg_save_size_in_words;
232 static int frame_size_in_bytes = -1;
233
234 static OopMap* generate_oop_map(StubAssembler* sasm, bool save_fpu_registers) {
235 int frame_size_in_bytes = reg_save_frame_size * BytesPerWord;
236 sasm->set_frame_size(frame_size_in_bytes / BytesPerWord);
237 int frame_size_in_slots = frame_size_in_bytes / sizeof(jint);
238 OopMap* oop_map = new OopMap(frame_size_in_slots, 0);
239
240 for (int i = 0; i < FrameMap::nof_cpu_regs; i++) {
241 Register r = as_Register(i);
242 if (i <= 18 && i != rscratch1->encoding() && i != rscratch2->encoding()) {
243 int sp_offset = cpu_reg_save_offsets[i];
244 oop_map->set_callee_saved(VMRegImpl::stack2reg(sp_offset),
245 r->as_VMReg());
246 }
247 }
248
249 if (save_fpu_registers) {
250 for (int i = 0; i < FrameMap::nof_fpu_regs; i++) {
251 FloatRegister r = as_FloatRegister(i);
252 {
253 int sp_offset = fpu_reg_save_offsets[i];
254 oop_map->set_callee_saved(VMRegImpl::stack2reg(sp_offset),
255 r->as_VMReg());
256 }
257 }
258 }
259 return oop_map;
260 }
261
262 static OopMap* save_live_registers(StubAssembler* sasm,
263 bool save_fpu_registers = true) {
264 __ block_comment("save_live_registers");
265
266 __ push(RegSet::range(r0, r29), sp); // integer registers except lr & sp
267
268 if (save_fpu_registers) {
269 for (int i = 31; i>= 0; i -= 4) {
270 __ sub(sp, sp, 4 * wordSize); // no pre-increment for st1. Emulate it without modifying other registers
271 __ st1(as_FloatRegister(i-3), as_FloatRegister(i-2), as_FloatRegister(i-1),
272 as_FloatRegister(i), __ T1D, Address(sp));
273 }
274 } else {
275 __ add(sp, sp, -32 * wordSize);
276 }
277
278 return generate_oop_map(sasm, save_fpu_registers);
279 }
280
281 static void restore_live_registers(StubAssembler* sasm, bool restore_fpu_registers = true) {
282 if (restore_fpu_registers) {
283 for (int i = 0; i < 32; i += 4)
284 __ ld1(as_FloatRegister(i), as_FloatRegister(i+1), as_FloatRegister(i+2),
285 as_FloatRegister(i+3), __ T1D, Address(__ post(sp, 4 * wordSize)));
286 } else {
287 __ add(sp, sp, 32 * wordSize);
288 }
289
290 __ pop(RegSet::range(r0, r29), sp);
291 }
292
293 static void restore_live_registers_except_r0(StubAssembler* sasm, bool restore_fpu_registers = true) {
294
295 if (restore_fpu_registers) {
296 for (int i = 0; i < 32; i += 4)
297 __ ld1(as_FloatRegister(i), as_FloatRegister(i+1), as_FloatRegister(i+2),
298 as_FloatRegister(i+3), __ T1D, Address(__ post(sp, 4 * wordSize)));
299 } else {
300 __ add(sp, sp, 32 * wordSize);
301 }
302
303 __ ldp(zr, r1, Address(__ post(sp, 16)));
304 __ pop(RegSet::range(r2, r29), sp);
305 }
306
307
308
309 void Runtime1::initialize_pd() {
310 int i;
311 int sp_offset = 0;
312
313 // all float registers are saved explicitly
314 assert(FrameMap::nof_fpu_regs == 32, "double registers not handled here");
315 for (i = 0; i < FrameMap::nof_fpu_regs; i++) {
316 fpu_reg_save_offsets[i] = sp_offset;
317 sp_offset += 2; // SP offsets are in halfwords
318 }
319
320 for (i = 0; i < FrameMap::nof_cpu_regs; i++) {
321 Register r = as_Register(i);
322 cpu_reg_save_offsets[i] = sp_offset;
323 sp_offset += 2; // SP offsets are in halfwords
324 }
325 }
326
327
328 // target: the entry point of the method that creates and posts the exception oop
329 // has_argument: true if the exception needs arguments (passed in rscratch1 and rscratch2)
330
331 OopMapSet* Runtime1::generate_exception_throw(StubAssembler* sasm, address target, bool has_argument) {
332 // make a frame and preserve the caller's caller-save registers
333 OopMap* oop_map = save_live_registers(sasm);
334 int call_offset;
335 if (!has_argument) {
336 call_offset = __ call_RT(noreg, noreg, target);
337 } else {
338 __ mov(c_rarg1, rscratch1);
339 __ mov(c_rarg2, rscratch2);
340 call_offset = __ call_RT(noreg, noreg, target);
341 }
342 OopMapSet* oop_maps = new OopMapSet();
343 oop_maps->add_gc_map(call_offset, oop_map);
344
345 __ should_not_reach_here();
346 return oop_maps;
347 }
348
349
350 OopMapSet* Runtime1::generate_handle_exception(StubID id, StubAssembler *sasm) {
351 __ block_comment("generate_handle_exception");
352
353 // incoming parameters
354 const Register exception_oop = r0;
355 const Register exception_pc = r3;
356 // other registers used in this stub
357
358 // Save registers, if required.
359 OopMapSet* oop_maps = new OopMapSet();
360 OopMap* oop_map = NULL;
361 switch (id) {
362 case forward_exception_id:
363 // We're handling an exception in the context of a compiled frame.
364 // The registers have been saved in the standard places. Perform
365 // an exception lookup in the caller and dispatch to the handler
366 // if found. Otherwise unwind and dispatch to the callers
367 // exception handler.
368 oop_map = generate_oop_map(sasm, 1 /*thread*/);
369
370 // load and clear pending exception oop into r0
371 __ ldr(exception_oop, Address(rthread, Thread::pending_exception_offset()));
372 __ str(zr, Address(rthread, Thread::pending_exception_offset()));
373
374 // load issuing PC (the return address for this stub) into r3
375 __ ldr(exception_pc, Address(rfp, 1*BytesPerWord));
376
377 // make sure that the vm_results are cleared (may be unnecessary)
378 __ str(zr, Address(rthread, JavaThread::vm_result_offset()));
379 __ str(zr, Address(rthread, JavaThread::vm_result_2_offset()));
380 break;
381 case handle_exception_nofpu_id:
382 case handle_exception_id:
383 // At this point all registers MAY be live.
384 oop_map = save_live_registers(sasm, id != handle_exception_nofpu_id);
385 break;
386 case handle_exception_from_callee_id: {
387 // At this point all registers except exception oop (r0) and
388 // exception pc (lr) are dead.
389 const int frame_size = 2 /*fp, return address*/;
390 oop_map = new OopMap(frame_size * VMRegImpl::slots_per_word, 0);
391 sasm->set_frame_size(frame_size);
392 break;
393 }
394 default:
395 __ should_not_reach_here();
396 break;
397 }
398
399 // verify that only r0 and r3 are valid at this time
400 __ invalidate_registers(false, true, true, false, true, true);
401 // verify that r0 contains a valid exception
402 __ verify_not_null_oop(exception_oop);
403
404 #ifdef ASSERT
405 // check that fields in JavaThread for exception oop and issuing pc are
406 // empty before writing to them
407 Label oop_empty;
408 __ ldr(rscratch1, Address(rthread, JavaThread::exception_oop_offset()));
409 __ cbz(rscratch1, oop_empty);
410 __ stop("exception oop already set");
411 __ bind(oop_empty);
412
413 Label pc_empty;
414 __ ldr(rscratch1, Address(rthread, JavaThread::exception_pc_offset()));
415 __ cbz(rscratch1, pc_empty);
416 __ stop("exception pc already set");
417 __ bind(pc_empty);
418 #endif
419
420 // save exception oop and issuing pc into JavaThread
421 // (exception handler will load it from here)
422 __ str(exception_oop, Address(rthread, JavaThread::exception_oop_offset()));
423 __ str(exception_pc, Address(rthread, JavaThread::exception_pc_offset()));
424
425 // patch throwing pc into return address (has bci & oop map)
426 __ str(exception_pc, Address(rfp, 1*BytesPerWord));
427
428 // compute the exception handler.
429 // the exception oop and the throwing pc are read from the fields in JavaThread
430 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, exception_handler_for_pc));
431 oop_maps->add_gc_map(call_offset, oop_map);
432
433 // r0: handler address
434 // will be the deopt blob if nmethod was deoptimized while we looked up
435 // handler regardless of whether handler existed in the nmethod.
436
437 // only r0 is valid at this time, all other registers have been destroyed by the runtime call
438 __ invalidate_registers(false, true, true, true, true, true);
439
440 // patch the return address, this stub will directly return to the exception handler
441 __ str(r0, Address(rfp, 1*BytesPerWord));
442
443 switch (id) {
444 case forward_exception_id:
445 case handle_exception_nofpu_id:
446 case handle_exception_id:
447 // Restore the registers that were saved at the beginning.
448 restore_live_registers(sasm, id != handle_exception_nofpu_id);
449 break;
450 case handle_exception_from_callee_id:
451 // Pop the return address.
452 __ leave();
453 __ ret(lr); // jump to exception handler
454 break;
455 default: ShouldNotReachHere();
456 }
457
458 return oop_maps;
459 }
460
461
462 void Runtime1::generate_unwind_exception(StubAssembler *sasm) {
463 // incoming parameters
464 const Register exception_oop = r0;
465 // callee-saved copy of exception_oop during runtime call
466 const Register exception_oop_callee_saved = r19;
467 // other registers used in this stub
468 const Register exception_pc = r3;
469 const Register handler_addr = r1;
470
471 // verify that only r0, is valid at this time
472 __ invalidate_registers(false, true, true, true, true, true);
473
474 #ifdef ASSERT
475 // check that fields in JavaThread for exception oop and issuing pc are empty
476 Label oop_empty;
477 __ ldr(rscratch1, Address(rthread, JavaThread::exception_oop_offset()));
478 __ cbz(rscratch1, oop_empty);
479 __ stop("exception oop must be empty");
480 __ bind(oop_empty);
481
482 Label pc_empty;
483 __ ldr(rscratch1, Address(rthread, JavaThread::exception_pc_offset()));
484 __ cbz(rscratch1, pc_empty);
485 __ stop("exception pc must be empty");
486 __ bind(pc_empty);
487 #endif
488
489 // Save our return address because
490 // exception_handler_for_return_address will destroy it. We also
491 // save exception_oop
492 __ stp(lr, exception_oop, Address(__ pre(sp, -2 * wordSize)));
493
494 // search the exception handler address of the caller (using the return address)
495 __ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::exception_handler_for_return_address), rthread, lr);
496 // r0: exception handler address of the caller
497
498 // Only R0 is valid at this time; all other registers have been
499 // destroyed by the call.
500 __ invalidate_registers(false, true, true, true, false, true);
501
502 // move result of call into correct register
503 __ mov(handler_addr, r0);
504
505 // get throwing pc (= return address).
506 // lr has been destroyed by the call
507 __ ldp(lr, exception_oop, Address(__ post(sp, 2 * wordSize)));
508 __ mov(r3, lr);
509
510 __ verify_not_null_oop(exception_oop);
511
512 // continue at exception handler (return address removed)
513 // note: do *not* remove arguments when unwinding the
514 // activation since the caller assumes having
515 // all arguments on the stack when entering the
516 // runtime to determine the exception handler
517 // (GC happens at call site with arguments!)
518 // r0: exception oop
519 // r3: throwing pc
520 // r1: exception handler
521 __ br(handler_addr);
522 }
523
524
525
526 OopMapSet* Runtime1::generate_patching(StubAssembler* sasm, address target) {
527 // use the maximum number of runtime-arguments here because it is difficult to
528 // distinguish each RT-Call.
529 // Note: This number affects also the RT-Call in generate_handle_exception because
530 // the oop-map is shared for all calls.
531 DeoptimizationBlob* deopt_blob = SharedRuntime::deopt_blob();
532 assert(deopt_blob != NULL, "deoptimization blob must have been created");
533
534 OopMap* oop_map = save_live_registers(sasm);
535
536 __ mov(c_rarg0, rthread);
537 Label retaddr;
538 __ set_last_Java_frame(sp, rfp, retaddr, rscratch1);
539 // do the call
540 __ lea(rscratch1, RuntimeAddress(target));
541 __ blrt(rscratch1, 1, 0, 1);
542 __ bind(retaddr);
543 OopMapSet* oop_maps = new OopMapSet();
544 oop_maps->add_gc_map(__ offset(), oop_map);
545 // verify callee-saved register
546 #ifdef ASSERT
547 { Label L;
548 __ get_thread(rscratch1);
549 __ cmp(rthread, rscratch1);
550 __ br(Assembler::EQ, L);
551 __ stop("StubAssembler::call_RT: rthread not callee saved?");
552 __ bind(L);
553 }
554 #endif
555 __ reset_last_Java_frame(true);
556 __ maybe_isb();
557
558 // check for pending exceptions
559 { Label L;
560 __ ldr(rscratch1, Address(rthread, Thread::pending_exception_offset()));
561 __ cbz(rscratch1, L);
562 // exception pending => remove activation and forward to exception handler
563
564 { Label L1;
565 __ cbnz(r0, L1); // have we deoptimized?
566 __ far_jump(RuntimeAddress(Runtime1::entry_for(Runtime1::forward_exception_id)));
567 __ bind(L1);
568 }
569
570 // the deopt blob expects exceptions in the special fields of
571 // JavaThread, so copy and clear pending exception.
572
573 // load and clear pending exception
574 __ ldr(r0, Address(rthread, Thread::pending_exception_offset()));
575 __ str(zr, Address(rthread, Thread::pending_exception_offset()));
576
577 // check that there is really a valid exception
578 __ verify_not_null_oop(r0);
579
580 // load throwing pc: this is the return address of the stub
581 __ mov(r3, lr);
582
583 #ifdef ASSERT
584 // check that fields in JavaThread for exception oop and issuing pc are empty
585 Label oop_empty;
586 __ ldr(rscratch1, Address(rthread, Thread::pending_exception_offset()));
587 __ cbz(rscratch1, oop_empty);
588 __ stop("exception oop must be empty");
589 __ bind(oop_empty);
590
591 Label pc_empty;
592 __ ldr(rscratch1, Address(rthread, JavaThread::exception_pc_offset()));
593 __ cbz(rscratch1, pc_empty);
594 __ stop("exception pc must be empty");
595 __ bind(pc_empty);
596 #endif
597
598 // store exception oop and throwing pc to JavaThread
599 __ str(r0, Address(rthread, JavaThread::exception_oop_offset()));
600 __ str(r3, Address(rthread, JavaThread::exception_pc_offset()));
601
602 restore_live_registers(sasm);
603
604 __ leave();
605
606 // Forward the exception directly to deopt blob. We can blow no
607 // registers and must leave throwing pc on the stack. A patch may
608 // have values live in registers so the entry point with the
609 // exception in tls.
610 __ far_jump(RuntimeAddress(deopt_blob->unpack_with_exception_in_tls()));
611
612 __ bind(L);
613 }
614
615
616 // Runtime will return true if the nmethod has been deoptimized during
617 // the patching process. In that case we must do a deopt reexecute instead.
618
619 Label cont;
620
621 __ cbz(r0, cont); // have we deoptimized?
622
623 // Will reexecute. Proper return address is already on the stack we just restore
624 // registers, pop all of our frame but the return address and jump to the deopt blob
625 restore_live_registers(sasm);
626 __ leave();
627 __ far_jump(RuntimeAddress(deopt_blob->unpack_with_reexecution()));
628
629 __ bind(cont);
630 restore_live_registers(sasm);
631 __ leave();
632 __ ret(lr);
633
634 return oop_maps;
635 }
636
637
638 OopMapSet* Runtime1::generate_code_for(StubID id, StubAssembler* sasm) {
639
640 const Register exception_oop = r0;
641 const Register exception_pc = r3;
642
643 // for better readability
644 const bool must_gc_arguments = true;
645 const bool dont_gc_arguments = false;
646
647 // default value; overwritten for some optimized stubs that are called from methods that do not use the fpu
648 bool save_fpu_registers = true;
649
650 // stub code & info for the different stubs
651 OopMapSet* oop_maps = NULL;
652 OopMap* oop_map = NULL;
653 switch (id) {
654 {
655 case forward_exception_id:
656 {
657 oop_maps = generate_handle_exception(id, sasm);
658 __ leave();
659 __ ret(lr);
660 }
661 break;
662
663 case throw_div0_exception_id:
664 { StubFrame f(sasm, "throw_div0_exception", dont_gc_arguments);
665 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_div0_exception), false);
666 }
667 break;
668
669 case throw_null_pointer_exception_id:
670 { StubFrame f(sasm, "throw_null_pointer_exception", dont_gc_arguments);
671 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_null_pointer_exception), false);
672 }
673 break;
674
675 case new_instance_id:
676 case fast_new_instance_id:
677 case fast_new_instance_init_check_id:
678 {
679 Register klass = r3; // Incoming
680 Register obj = r0; // Result
681
682 if (id == new_instance_id) {
683 __ set_info("new_instance", dont_gc_arguments);
684 } else if (id == fast_new_instance_id) {
685 __ set_info("fast new_instance", dont_gc_arguments);
686 } else {
687 assert(id == fast_new_instance_init_check_id, "bad StubID");
688 __ set_info("fast new_instance init check", dont_gc_arguments);
689 }
690
691 // If TLAB is disabled, see if there is support for inlining contiguous
692 // allocations.
693 // Otherwise, just go to the slow path.
694 if ((id == fast_new_instance_id || id == fast_new_instance_init_check_id) &&
695 !UseTLAB && Universe::heap()->supports_inline_contig_alloc()) {
696 Label slow_path;
697 Register obj_size = r2;
698 Register t1 = r19;
699 Register t2 = r4;
700 assert_different_registers(klass, obj, obj_size, t1, t2);
701
702 __ stp(r19, zr, Address(__ pre(sp, -2 * wordSize)));
703
704 if (id == fast_new_instance_init_check_id) {
705 // make sure the klass is initialized
706 __ ldrb(rscratch1, Address(klass, InstanceKlass::init_state_offset()));
707 __ cmpw(rscratch1, InstanceKlass::fully_initialized);
708 __ br(Assembler::NE, slow_path);
709 }
710
711 #ifdef ASSERT
712 // assert object can be fast path allocated
713 {
714 Label ok, not_ok;
715 __ ldrw(obj_size, Address(klass, Klass::layout_helper_offset()));
716 __ cmp(obj_size, (u1)0);
717 __ br(Assembler::LE, not_ok); // make sure it's an instance (LH > 0)
718 __ tstw(obj_size, Klass::_lh_instance_slow_path_bit);
719 __ br(Assembler::EQ, ok);
720 __ bind(not_ok);
721 __ stop("assert(can be fast path allocated)");
722 __ should_not_reach_here();
723 __ bind(ok);
724 }
725 #endif // ASSERT
726
727 // get the instance size (size is postive so movl is fine for 64bit)
728 __ ldrw(obj_size, Address(klass, Klass::layout_helper_offset()));
729
730 __ eden_allocate(obj, obj_size, 0, t1, slow_path);
731
732 __ initialize_object(obj, klass, obj_size, 0, t1, t2, /* is_tlab_allocated */ false);
733 __ verify_oop(obj);
734 __ ldp(r19, zr, Address(__ post(sp, 2 * wordSize)));
735 __ ret(lr);
736
737 __ bind(slow_path);
738 __ ldp(r19, zr, Address(__ post(sp, 2 * wordSize)));
739 }
740
741 __ enter();
742 OopMap* map = save_live_registers(sasm);
743 int call_offset = __ call_RT(obj, noreg, CAST_FROM_FN_PTR(address, new_instance), klass);
744 oop_maps = new OopMapSet();
745 oop_maps->add_gc_map(call_offset, map);
746 restore_live_registers_except_r0(sasm);
747 __ verify_oop(obj);
748 __ leave();
749 __ ret(lr);
750
751 // r0,: new instance
752 }
753
754 break;
755
756 case counter_overflow_id:
757 {
758 Register bci = r0, method = r1;
759 __ enter();
760 OopMap* map = save_live_registers(sasm);
761 // Retrieve bci
762 __ ldrw(bci, Address(rfp, 2*BytesPerWord));
763 // And a pointer to the Method*
764 __ ldr(method, Address(rfp, 3*BytesPerWord));
765 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, counter_overflow), bci, method);
766 oop_maps = new OopMapSet();
767 oop_maps->add_gc_map(call_offset, map);
768 restore_live_registers(sasm);
769 __ leave();
770 __ ret(lr);
771 }
772 break;
773
774 case new_type_array_id:
775 case new_object_array_id:
776 case new_value_array_id:
777 {
778 Register length = r19; // Incoming
779 Register klass = r3; // Incoming
780 Register obj = r0; // Result
781
782 if (id == new_type_array_id) {
783 __ set_info("new_type_array", dont_gc_arguments);
784 }
785 else if (id == new_object_array_id) {
786 __ set_info("new_object_array", dont_gc_arguments);
787 }
788 else {
789 __ set_info("new_value_array", dont_gc_arguments);
790 }
791
792 #ifdef ASSERT
793 // assert object type is really an array of the proper kind
794 {
795 Label ok;
796 Register t0 = obj;
797 __ ldrw(t0, Address(klass, Klass::layout_helper_offset()));
798 __ asrw(t0, t0, Klass::_lh_array_tag_shift);
799
800 int tag = 0;
801 switch (id) {
802 case new_type_array_id: tag = Klass::_lh_array_tag_type_value; break;
803 case new_object_array_id: tag = Klass::_lh_array_tag_obj_value; break;
804 case new_value_array_id: tag = Klass::_lh_array_tag_vt_value; break;
805 default: ShouldNotReachHere();
806 }
807 __ mov(rscratch1, tag);
808 __ cmpw(t0, rscratch1);
809 __ br(Assembler::EQ, ok);
810 __ stop("assert(is an array klass)");
811 __ should_not_reach_here();
812 __ bind(ok);
813 }
814 #endif // ASSERT
815
816 // If TLAB is disabled, see if there is support for inlining contiguous
817 // allocations.
818 // Otherwise, just go to the slow path.
819 if (!UseTLAB && Universe::heap()->supports_inline_contig_alloc()) {
820 Register arr_size = r4;
821 Register t1 = r2;
822 Register t2 = r5;
823 Label slow_path;
824 assert_different_registers(length, klass, obj, arr_size, t1, t2);
825
826 // check that array length is small enough for fast path.
827 __ mov(rscratch1, C1_MacroAssembler::max_array_allocation_length);
828 __ cmpw(length, rscratch1);
829 __ br(Assembler::HI, slow_path);
830
831 // get the allocation size: round_up(hdr + length << (layout_helper & 0x1F))
832 // since size is positive ldrw does right thing on 64bit
833 __ ldrw(t1, Address(klass, Klass::layout_helper_offset()));
834 // since size is positive movw does right thing on 64bit
835 __ movw(arr_size, length);
836 __ lslvw(arr_size, length, t1);
837 __ ubfx(t1, t1, Klass::_lh_header_size_shift,
838 exact_log2(Klass::_lh_header_size_mask + 1));
839 __ add(arr_size, arr_size, t1);
840 __ add(arr_size, arr_size, MinObjAlignmentInBytesMask); // align up
841 __ andr(arr_size, arr_size, ~MinObjAlignmentInBytesMask);
842
843 __ eden_allocate(obj, arr_size, 0, t1, slow_path); // preserves arr_size
844
845 __ initialize_header(obj, klass, length, t1, t2);
846 __ ldrb(t1, Address(klass, in_bytes(Klass::layout_helper_offset()) + (Klass::_lh_header_size_shift / BitsPerByte)));
847 assert(Klass::_lh_header_size_shift % BitsPerByte == 0, "bytewise");
848 assert(Klass::_lh_header_size_mask <= 0xFF, "bytewise");
849 __ andr(t1, t1, Klass::_lh_header_size_mask);
850 __ sub(arr_size, arr_size, t1); // body length
851 __ add(t1, t1, obj); // body start
852 __ initialize_body(t1, arr_size, 0, t2);
853 __ verify_oop(obj);
854
855 __ ret(lr);
856
857 __ bind(slow_path);
858 }
859
860 __ enter();
861 OopMap* map = save_live_registers(sasm);
862 int call_offset;
863 if (id == new_type_array_id) {
864 call_offset = __ call_RT(obj, noreg, CAST_FROM_FN_PTR(address, new_type_array), klass, length);
865 } else {
866 // Runtime1::new_object_array handles both object and value arrays
867 call_offset = __ call_RT(obj, noreg, CAST_FROM_FN_PTR(address, new_object_array), klass, length);
868 }
869
870 oop_maps = new OopMapSet();
871 oop_maps->add_gc_map(call_offset, map);
872 restore_live_registers_except_r0(sasm);
873
874 __ verify_oop(obj);
875 __ leave();
876 __ ret(lr);
877
878 // r0: new array
879 }
880 break;
881
882 case new_multi_array_id:
883 { StubFrame f(sasm, "new_multi_array", dont_gc_arguments);
884 // r0,: klass
885 // r19,: rank
886 // r2: address of 1st dimension
887 OopMap* map = save_live_registers(sasm);
888 __ mov(c_rarg1, r0);
889 __ mov(c_rarg3, r2);
890 __ mov(c_rarg2, r19);
891 int call_offset = __ call_RT(r0, noreg, CAST_FROM_FN_PTR(address, new_multi_array), r1, r2, r3);
892
893 oop_maps = new OopMapSet();
894 oop_maps->add_gc_map(call_offset, map);
895 restore_live_registers_except_r0(sasm);
896
897 // r0,: new multi array
898 __ verify_oop(r0);
899 }
900 break;
901
902 case buffer_value_args_id:
903 case buffer_value_args_no_receiver_id:
904 {
905 const char* name = (id == buffer_value_args_id) ?
906 "buffer_value_args" : "buffer_value_args_no_receiver";
907 StubFrame f(sasm, name, dont_gc_arguments);
908 OopMap* map = save_live_registers(sasm, 2);
909 Register method = r1;
910 address entry = (id == buffer_value_args_id) ?
911 CAST_FROM_FN_PTR(address, buffer_value_args) :
912 CAST_FROM_FN_PTR(address, buffer_value_args_no_receiver);
913 int call_offset = __ call_RT(r0, noreg, entry, method);
914 oop_maps = new OopMapSet();
915 oop_maps->add_gc_map(call_offset, map);
916 restore_live_registers_except_r0(sasm);
917 __ verify_oop(r0); // r0: an array of buffered value objects
918 }
919 break;
920
921 case load_flattened_array_id:
922 {
923 StubFrame f(sasm, "load_flattened_array", dont_gc_arguments);
924 OopMap* map = save_live_registers(sasm, 3);
925
926 // Called with store_parameter and not C abi
927
928 f.load_argument(1, r0); // r0,: array
929 f.load_argument(0, r1); // r1,: index
930 int call_offset = __ call_RT(r0, noreg, CAST_FROM_FN_PTR(address, load_flattened_array), r0, r1);
931
932 oop_maps = new OopMapSet();
933 oop_maps->add_gc_map(call_offset, map);
934 restore_live_registers_except_r0(sasm);
935
936 // r0: loaded element at array[index]
937 __ verify_oop(r0);
938 }
939 break;
940
941 case store_flattened_array_id:
942 {
943 StubFrame f(sasm, "store_flattened_array", dont_gc_arguments);
944 OopMap* map = save_live_registers(sasm, 4);
945
946 // Called with store_parameter and not C abi
947
948 f.load_argument(2, r0); // r0: array
949 f.load_argument(1, r1); // r1: index
950 f.load_argument(0, r2); // r2: value
951 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, store_flattened_array), r0, r1, r2);
952
953 oop_maps = new OopMapSet();
954 oop_maps->add_gc_map(call_offset, map);
955 restore_live_registers_except_r0(sasm);
956 }
957 break;
958
959 case substitutability_check_id:
960 {
961 StubFrame f(sasm, "substitutability_check", dont_gc_arguments);
962 OopMap* map = save_live_registers(sasm, 3);
963
964 // Called with store_parameter and not C abi
965
966 f.load_argument(1, r0); // r0,: left
967 f.load_argument(0, r1); // r1,: right
968 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, substitutability_check), r0, r1);
969
970 oop_maps = new OopMapSet();
971 oop_maps->add_gc_map(call_offset, map);
972 restore_live_registers_except_r0(sasm);
973
974 // r0,: are the two operands substitutable
975 }
976 break;
977
978
979
980 case register_finalizer_id:
981 {
982 __ set_info("register_finalizer", dont_gc_arguments);
983
984 // This is called via call_runtime so the arguments
985 // will be place in C abi locations
986
987 __ verify_oop(c_rarg0);
988
989 // load the klass and check the has finalizer flag
990 Label register_finalizer;
991 Register t = r5;
992 __ load_klass(t, r0);
993 __ ldrw(t, Address(t, Klass::access_flags_offset()));
994 __ tbnz(t, exact_log2(JVM_ACC_HAS_FINALIZER), register_finalizer);
995 __ ret(lr);
996
997 __ bind(register_finalizer);
998 __ enter();
999 OopMap* oop_map = save_live_registers(sasm);
1000 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, SharedRuntime::register_finalizer), r0);
1001 oop_maps = new OopMapSet();
1002 oop_maps->add_gc_map(call_offset, oop_map);
1003
1004 // Now restore all the live registers
1005 restore_live_registers(sasm);
1006
1007 __ leave();
1008 __ ret(lr);
1009 }
1010 break;
1011
1012 case throw_class_cast_exception_id:
1013 { StubFrame f(sasm, "throw_class_cast_exception", dont_gc_arguments);
1014 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_class_cast_exception), true);
1015 }
1016 break;
1017
1018 case throw_incompatible_class_change_error_id:
1019 { StubFrame f(sasm, "throw_incompatible_class_change_exception", dont_gc_arguments);
1020 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_incompatible_class_change_error), false);
1021 }
1022 break;
1023
1024 case throw_illegal_monitor_state_exception_id:
1025 { StubFrame f(sasm, "throw_illegal_monitor_state_exception", dont_gc_arguments);
1026 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_illegal_monitor_state_exception), false);
1027 }
1028 break;
1029
1030 case slow_subtype_check_id:
1031 {
1032 // Typical calling sequence:
1033 // __ push(klass_RInfo); // object klass or other subclass
1034 // __ push(sup_k_RInfo); // array element klass or other superclass
1035 // __ bl(slow_subtype_check);
1036 // Note that the subclass is pushed first, and is therefore deepest.
1037 enum layout {
1038 r0_off, r0_off_hi,
1039 r2_off, r2_off_hi,
1040 r4_off, r4_off_hi,
1041 r5_off, r5_off_hi,
1042 sup_k_off, sup_k_off_hi,
1043 klass_off, klass_off_hi,
1044 framesize,
1045 result_off = sup_k_off
1046 };
1047
1048 __ set_info("slow_subtype_check", dont_gc_arguments);
1049 __ push(RegSet::of(r0, r2, r4, r5), sp);
1050
1051 // This is called by pushing args and not with C abi
1052 // __ ldr(r4, Address(sp, (klass_off) * VMRegImpl::stack_slot_size)); // subclass
1053 // __ ldr(r0, Address(sp, (sup_k_off) * VMRegImpl::stack_slot_size)); // superclass
1054
1055 __ ldp(r4, r0, Address(sp, (sup_k_off) * VMRegImpl::stack_slot_size));
1056
1057 Label miss;
1058 __ check_klass_subtype_slow_path(r4, r0, r2, r5, NULL, &miss);
1059
1060 // fallthrough on success:
1061 __ mov(rscratch1, 1);
1062 __ str(rscratch1, Address(sp, (result_off) * VMRegImpl::stack_slot_size)); // result
1063 __ pop(RegSet::of(r0, r2, r4, r5), sp);
1064 __ ret(lr);
1065
1066 __ bind(miss);
1067 __ str(zr, Address(sp, (result_off) * VMRegImpl::stack_slot_size)); // result
1068 __ pop(RegSet::of(r0, r2, r4, r5), sp);
1069 __ ret(lr);
1070 }
1071 break;
1072
1073 case monitorenter_nofpu_id:
1074 save_fpu_registers = false;
1075 // fall through
1076 case monitorenter_id:
1077 {
1078 StubFrame f(sasm, "monitorenter", dont_gc_arguments);
1079 OopMap* map = save_live_registers(sasm, save_fpu_registers);
1080
1081 // Called with store_parameter and not C abi
1082
1083 f.load_argument(1, r0); // r0,: object
1084 f.load_argument(0, r1); // r1,: lock address
1085
1086 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, monitorenter), r0, r1);
1087
1088 oop_maps = new OopMapSet();
1089 oop_maps->add_gc_map(call_offset, map);
1090 restore_live_registers(sasm, save_fpu_registers);
1091 }
1092 break;
1093
1094 case monitorexit_nofpu_id:
1095 save_fpu_registers = false;
1096 // fall through
1097 case monitorexit_id:
1098 {
1099 StubFrame f(sasm, "monitorexit", dont_gc_arguments);
1100 OopMap* map = save_live_registers(sasm, save_fpu_registers);
1101
1102 // Called with store_parameter and not C abi
1103
1104 f.load_argument(0, r0); // r0,: lock address
1105
1106 // note: really a leaf routine but must setup last java sp
1107 // => use call_RT for now (speed can be improved by
1108 // doing last java sp setup manually)
1109 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, monitorexit), r0);
1110
1111 oop_maps = new OopMapSet();
1112 oop_maps->add_gc_map(call_offset, map);
1113 restore_live_registers(sasm, save_fpu_registers);
1114 }
1115 break;
1116
1117 case deoptimize_id:
1118 {
1119 StubFrame f(sasm, "deoptimize", dont_gc_arguments);
1120 OopMap* oop_map = save_live_registers(sasm);
1121 f.load_argument(0, c_rarg1);
1122 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, deoptimize), c_rarg1);
1123
1124 oop_maps = new OopMapSet();
1125 oop_maps->add_gc_map(call_offset, oop_map);
1126 restore_live_registers(sasm);
1127 DeoptimizationBlob* deopt_blob = SharedRuntime::deopt_blob();
1128 assert(deopt_blob != NULL, "deoptimization blob must have been created");
1129 __ leave();
1130 __ far_jump(RuntimeAddress(deopt_blob->unpack_with_reexecution()));
1131 }
1132 break;
1133
1134 case throw_range_check_failed_id:
1135 { StubFrame f(sasm, "range_check_failed", dont_gc_arguments);
1136 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_range_check_exception), true);
1137 }
1138 break;
1139
1140 case unwind_exception_id:
1141 { __ set_info("unwind_exception", dont_gc_arguments);
1142 // note: no stubframe since we are about to leave the current
1143 // activation and we are calling a leaf VM function only.
1144 generate_unwind_exception(sasm);
1145 }
1146 break;
1147
1148 case access_field_patching_id:
1149 { StubFrame f(sasm, "access_field_patching", dont_gc_arguments);
1150 // we should set up register map
1151 oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, access_field_patching));
1152 }
1153 break;
1154
1155 case load_klass_patching_id:
1156 { StubFrame f(sasm, "load_klass_patching", dont_gc_arguments);
1157 // we should set up register map
1158 oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, move_klass_patching));
1159 }
1160 break;
1161
1162 case load_mirror_patching_id:
1163 { StubFrame f(sasm, "load_mirror_patching", dont_gc_arguments);
1164 // we should set up register map
1165 oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, move_mirror_patching));
1166 }
1167 break;
1168
1169 case load_appendix_patching_id:
1170 { StubFrame f(sasm, "load_appendix_patching", dont_gc_arguments);
1171 // we should set up register map
1172 oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, move_appendix_patching));
1173 }
1174 break;
1175
1176 case handle_exception_nofpu_id:
1177 case handle_exception_id:
1178 { StubFrame f(sasm, "handle_exception", dont_gc_arguments);
1179 oop_maps = generate_handle_exception(id, sasm);
1180 }
1181 break;
1182
1183 case handle_exception_from_callee_id:
1184 { StubFrame f(sasm, "handle_exception_from_callee", dont_gc_arguments);
1185 oop_maps = generate_handle_exception(id, sasm);
1186 }
1187 break;
1188
1189 case throw_index_exception_id:
1190 { StubFrame f(sasm, "index_range_check_failed", dont_gc_arguments);
1191 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_index_exception), true);
1192 }
1193 break;
1194
1195 case throw_array_store_exception_id:
1196 { StubFrame f(sasm, "throw_array_store_exception", dont_gc_arguments);
1197 // tos + 0: link
1198 // + 1: return address
1199 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_array_store_exception), true);
1200 }
1201 break;
1202
1203 case predicate_failed_trap_id:
1204 {
1205 StubFrame f(sasm, "predicate_failed_trap", dont_gc_arguments);
1206
1207 OopMap* map = save_live_registers(sasm);
1208
1209 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, predicate_failed_trap));
1210 oop_maps = new OopMapSet();
1211 oop_maps->add_gc_map(call_offset, map);
1212 restore_live_registers(sasm);
1213 __ leave();
1214 DeoptimizationBlob* deopt_blob = SharedRuntime::deopt_blob();
1215 assert(deopt_blob != NULL, "deoptimization blob must have been created");
1216
1217 __ far_jump(RuntimeAddress(deopt_blob->unpack_with_reexecution()));
1218 }
1219 break;
1220
1221 default:
1222 // DMS CHECK: This code should be fixed in JDK workspace, because it fails
1223 // with assert during vm intialization rather than insert a call
1224 // to unimplemented_entry
1225 { StubFrame f(sasm, "unimplemented entry", dont_gc_arguments);
1226 __ mov(r0, (int)id);
1227 __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, unimplemented_entry), r0);
1228 __ should_not_reach_here();
1229 }
1230 break;
1231 }
1232 }
1233
1234
1235 return oop_maps;
1236 }
1237
1238 #undef __
1239
1240 const char *Runtime1::pd_name_for_address(address entry) { Unimplemented(); return 0; }