1 /*
2 * Copyright (c) 1999, 2018, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2012, 2015 SAP SE. 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 "c1/c1_CodeStubs.hpp"
28 #include "c1/c1_FrameMap.hpp"
29 #include "c1/c1_LIRAssembler.hpp"
30 #include "c1/c1_MacroAssembler.hpp"
31 #include "c1/c1_Runtime1.hpp"
32 #include "nativeInst_ppc.hpp"
33 #include "runtime/sharedRuntime.hpp"
34 #include "utilities/macros.hpp"
35 #include "vmreg_ppc.inline.hpp"
36 #if INCLUDE_ALL_GCS
37 #include "gc/g1/g1BarrierSet.hpp"
38 #endif // INCLUDE_ALL_GCS
39
40 #define __ ce->masm()->
41
42
43 RangeCheckStub::RangeCheckStub(CodeEmitInfo* info, LIR_Opr index, LIR_Opr array)
44 : _throw_index_out_of_bounds_exception(false), _index(index), _array(array) {
45 assert(info != NULL, "must have info");
46 _info = new CodeEmitInfo(info);
47 }
48
49 RangeCheckStub::RangeCheckStub(CodeEmitInfo* info, LIR_Opr index)
50 : _throw_index_out_of_bounds_exception(true), _index(index), _array(NULL) {
51 assert(info != NULL, "must have info");
52 _info = new CodeEmitInfo(info);
53 }
54
55 void RangeCheckStub::emit_code(LIR_Assembler* ce) {
56 __ bind(_entry);
57
58 if (_info->deoptimize_on_exception()) {
59 address a = Runtime1::entry_for(Runtime1::predicate_failed_trap_id);
60 // May be used by optimizations like LoopInvariantCodeMotion or RangeCheckEliminator.
61 DEBUG_ONLY( __ untested("RangeCheckStub: predicate_failed_trap_id"); )
62 //__ load_const_optimized(R0, a);
63 __ add_const_optimized(R0, R29_TOC, MacroAssembler::offset_to_global_toc(a));
64 __ mtctr(R0);
65 __ bctrl();
66 ce->add_call_info_here(_info);
67 ce->verify_oop_map(_info);
68 debug_only(__ illtrap());
69 return;
70 }
71
72 address stub = _throw_index_out_of_bounds_exception ? Runtime1::entry_for(Runtime1::throw_index_exception_id)
73 : Runtime1::entry_for(Runtime1::throw_range_check_failed_id);
74 //__ load_const_optimized(R0, stub);
75 __ add_const_optimized(R0, R29_TOC, MacroAssembler::offset_to_global_toc(stub));
76 __ mtctr(R0);
77
78 Register index = R0; // pass in R0
79 if (_index->is_register()) {
80 __ extsw(index, _index->as_register());
81 } else {
82 __ load_const_optimized(index, _index->as_jint());
83 }
84 if (_array) {
85 __ std(_array->as_pointer_register(), -8, R1_SP);
86 }
87 __ std(R0, -16, R1_SP);
88
89 __ bctrl();
90 ce->add_call_info_here(_info);
91 ce->verify_oop_map(_info);
92 debug_only(__ illtrap());
93 }
94
95
96 PredicateFailedStub::PredicateFailedStub(CodeEmitInfo* info) {
97 _info = new CodeEmitInfo(info);
98 }
99
100 void PredicateFailedStub::emit_code(LIR_Assembler* ce) {
101 __ bind(_entry);
102 address a = Runtime1::entry_for(Runtime1::predicate_failed_trap_id);
103 //__ load_const_optimized(R0, a);
104 __ add_const_optimized(R0, R29_TOC, MacroAssembler::offset_to_global_toc(a));
105 __ mtctr(R0);
106 __ bctrl();
107 ce->add_call_info_here(_info);
108 ce->verify_oop_map(_info);
109 debug_only(__ illtrap());
110 }
111
112
113 void CounterOverflowStub::emit_code(LIR_Assembler* ce) {
114 __ bind(_entry);
115
116 // Parameter 1: bci
117 __ load_const_optimized(R0, _bci);
118 __ std(R0, -16, R1_SP);
119
120 // Parameter 2: Method*
121 Metadata *m = _method->as_constant_ptr()->as_metadata();
122 AddressLiteral md = __ constant_metadata_address(m); // Notify OOP recorder (don't need the relocation).
123 __ load_const_optimized(R0, md.value());
124 __ std(R0, -8, R1_SP);
125
126 address a = Runtime1::entry_for(Runtime1::counter_overflow_id);
127 //__ load_const_optimized(R0, a);
128 __ add_const_optimized(R0, R29_TOC, MacroAssembler::offset_to_global_toc(a));
129 __ mtctr(R0);
130 __ bctrl();
131 ce->add_call_info_here(_info);
132 ce->verify_oop_map(_info);
133
134 __ b(_continuation);
135 }
136
137
138 void DivByZeroStub::emit_code(LIR_Assembler* ce) {
139 if (_offset != -1) {
140 ce->compilation()->implicit_exception_table()->append(_offset, __ offset());
141 }
142 __ bind(_entry);
143 address stub = Runtime1::entry_for(Runtime1::throw_div0_exception_id);
144 //__ load_const_optimized(R0, stub);
145 __ add_const_optimized(R0, R29_TOC, MacroAssembler::offset_to_global_toc(stub));
146 __ mtctr(R0);
147 __ bctrl();
148 ce->add_call_info_here(_info);
149 ce->verify_oop_map(_info);
150 debug_only(__ illtrap());
151 }
152
153
154 void ImplicitNullCheckStub::emit_code(LIR_Assembler* ce) {
155 address a;
156 if (_info->deoptimize_on_exception()) {
157 // Deoptimize, do not throw the exception, because it is probably wrong to do it here.
158 a = Runtime1::entry_for(Runtime1::predicate_failed_trap_id);
159 } else {
160 a = Runtime1::entry_for(Runtime1::throw_null_pointer_exception_id);
161 }
162
163 if (ImplicitNullChecks || TrapBasedNullChecks) {
164 ce->compilation()->implicit_exception_table()->append(_offset, __ offset());
165 }
166 __ bind(_entry);
167 //__ load_const_optimized(R0, a);
168 __ add_const_optimized(R0, R29_TOC, MacroAssembler::offset_to_global_toc(a));
169 __ mtctr(R0);
170 __ bctrl();
171 ce->add_call_info_here(_info);
172 ce->verify_oop_map(_info);
173 debug_only(__ illtrap());
174 }
175
176
177 // Implementation of SimpleExceptionStub
178 void SimpleExceptionStub::emit_code(LIR_Assembler* ce) {
179 __ bind(_entry);
180 address stub = Runtime1::entry_for(_stub);
181 //__ load_const_optimized(R0, stub);
182 __ add_const_optimized(R0, R29_TOC, MacroAssembler::offset_to_global_toc(stub));
183 if (_obj->is_valid()) { __ mr_if_needed(/*tmp1 in do_CheckCast*/ R4_ARG2, _obj->as_register()); }
184 __ mtctr(R0);
185 __ bctrl();
186 ce->add_call_info_here(_info);
187 debug_only( __ illtrap(); )
188 }
189
190
191 // Implementation of NewInstanceStub
192 NewInstanceStub::NewInstanceStub(LIR_Opr klass_reg, LIR_Opr result, ciInstanceKlass* klass, CodeEmitInfo* info, Runtime1::StubID stub_id) {
193 _result = result;
194 _klass = klass;
195 _klass_reg = klass_reg;
196 _info = new CodeEmitInfo(info);
197 assert(stub_id == Runtime1::new_instance_id ||
198 stub_id == Runtime1::fast_new_instance_id ||
199 stub_id == Runtime1::fast_new_instance_init_check_id,
200 "need new_instance id");
201 _stub_id = stub_id;
202 }
203
204 void NewInstanceStub::emit_code(LIR_Assembler* ce) {
205 __ bind(_entry);
206
207 address entry = Runtime1::entry_for(_stub_id);
208 //__ load_const_optimized(R0, entry);
209 __ add_const_optimized(R0, R29_TOC, MacroAssembler::offset_to_global_toc(entry));
210 __ mtctr(R0);
211 __ bctrl();
212 ce->add_call_info_here(_info);
213 ce->verify_oop_map(_info);
214 __ b(_continuation);
215 }
216
217
218 // Implementation of NewTypeArrayStub
219 NewTypeArrayStub::NewTypeArrayStub(LIR_Opr klass_reg, LIR_Opr length, LIR_Opr result, CodeEmitInfo* info) {
220 _klass_reg = klass_reg;
221 _length = length;
222 _result = result;
223 _info = new CodeEmitInfo(info);
224 }
225
226 void NewTypeArrayStub::emit_code(LIR_Assembler* ce) {
227 __ bind(_entry);
228
229 address entry = Runtime1::entry_for(Runtime1::new_type_array_id);
230 //__ load_const_optimized(R0, entry);
231 __ add_const_optimized(R0, R29_TOC, MacroAssembler::offset_to_global_toc(entry));
232 __ mr_if_needed(/*op->tmp1()->as_register()*/ R5_ARG3, _length->as_register()); // already sign-extended
233 __ mtctr(R0);
234 __ bctrl();
235 ce->add_call_info_here(_info);
236 ce->verify_oop_map(_info);
237 __ b(_continuation);
238 }
239
240
241 // Implementation of NewObjectArrayStub
242 NewObjectArrayStub::NewObjectArrayStub(LIR_Opr klass_reg, LIR_Opr length, LIR_Opr result, CodeEmitInfo* info) {
243 _klass_reg = klass_reg;
244 _length = length;
245 _result = result;
246 _info = new CodeEmitInfo(info);
247 }
248
249 void NewObjectArrayStub::emit_code(LIR_Assembler* ce) {
250 __ bind(_entry);
251
252 address entry = Runtime1::entry_for(Runtime1::new_object_array_id);
253 //__ load_const_optimized(R0, entry);
254 __ add_const_optimized(R0, R29_TOC, MacroAssembler::offset_to_global_toc(entry));
255 __ mr_if_needed(/*op->tmp1()->as_register()*/ R5_ARG3, _length->as_register()); // already sign-extended
256 __ mtctr(R0);
257 __ bctrl();
258 ce->add_call_info_here(_info);
259 ce->verify_oop_map(_info);
260 __ b(_continuation);
261 }
262
263
264 // Implementation of MonitorAccessStubs
265 MonitorEnterStub::MonitorEnterStub(LIR_Opr obj_reg, LIR_Opr lock_reg, CodeEmitInfo* info)
266 : MonitorAccessStub(obj_reg, lock_reg) {
267 _info = new CodeEmitInfo(info);
268 }
269
270 void MonitorEnterStub::emit_code(LIR_Assembler* ce) {
271 __ bind(_entry);
272 address stub = Runtime1::entry_for(ce->compilation()->has_fpu_code() ? Runtime1::monitorenter_id : Runtime1::monitorenter_nofpu_id);
273 //__ load_const_optimized(R0, stub);
274 __ add_const_optimized(R0, R29_TOC, MacroAssembler::offset_to_global_toc(stub));
275 __ mr_if_needed(/*scratch_opr()->as_register()*/ R4_ARG2, _obj_reg->as_register());
276 assert(_lock_reg->as_register() == R5_ARG3, "");
277 __ mtctr(R0);
278 __ bctrl();
279 ce->add_call_info_here(_info);
280 ce->verify_oop_map(_info);
281 __ b(_continuation);
282 }
283
284 void MonitorExitStub::emit_code(LIR_Assembler* ce) {
285 __ bind(_entry);
286 if (_compute_lock) {
287 ce->monitor_address(_monitor_ix, _lock_reg);
288 }
289 address stub = Runtime1::entry_for(ce->compilation()->has_fpu_code() ? Runtime1::monitorexit_id : Runtime1::monitorexit_nofpu_id);
290 //__ load_const_optimized(R0, stub);
291 __ add_const_optimized(R0, R29_TOC, MacroAssembler::offset_to_global_toc(stub));
292 assert(_lock_reg->as_register() == R4_ARG2, "");
293 __ mtctr(R0);
294 __ bctrl();
295 __ b(_continuation);
296 }
297
298
299 // Implementation of patching:
300 // - Copy the code at given offset to an inlined buffer (first the bytes, then the number of bytes).
301 // - Replace original code with a call to the stub.
302 // At Runtime:
303 // - call to stub, jump to runtime
304 // - in runtime: preserve all registers (especially objects, i.e., source and destination object)
305 // - in runtime: after initializing class, restore original code, reexecute instruction
306
307 int PatchingStub::_patch_info_offset = -(5 * BytesPerInstWord);
308
309 void PatchingStub::align_patch_site(MacroAssembler* ) {
310 // Patch sites on ppc are always properly aligned.
311 }
312
313 #ifdef ASSERT
314 inline void compare_with_patch_site(address template_start, address pc_start, int bytes_to_copy) {
315 address start = template_start;
316 for (int i = 0; i < bytes_to_copy; i++) {
317 address ptr = (address)(pc_start + i);
318 int a_byte = (*ptr) & 0xFF;
319 assert(a_byte == *start++, "should be the same code");
320 }
321 }
322 #endif
323
324 void PatchingStub::emit_code(LIR_Assembler* ce) {
325 // copy original code here
326 assert(NativeGeneralJump::instruction_size <= _bytes_to_copy && _bytes_to_copy <= 0xFF,
327 "not enough room for call");
328 assert((_bytes_to_copy & 0x3) == 0, "must copy a multiple of four bytes");
329
330 Label call_patch;
331
332 int being_initialized_entry = __ offset();
333
334 if (_id == load_klass_id) {
335 // Produce a copy of the load klass instruction for use by the being initialized case.
336 AddressLiteral addrlit((address)NULL, metadata_Relocation::spec(_index));
337 __ load_const(_obj, addrlit, R0);
338 DEBUG_ONLY( compare_with_patch_site(__ code_section()->start() + being_initialized_entry, _pc_start, _bytes_to_copy); )
339 } else if (_id == load_mirror_id || _id == load_appendix_id) {
340 // Produce a copy of the load mirror instruction for use by the being initialized case.
341 AddressLiteral addrlit((address)NULL, oop_Relocation::spec(_index));
342 __ load_const(_obj, addrlit, R0);
343 DEBUG_ONLY( compare_with_patch_site(__ code_section()->start() + being_initialized_entry, _pc_start, _bytes_to_copy); )
344 } else {
345 // Make a copy the code which is going to be patched.
346 for (int i = 0; i < _bytes_to_copy; i++) {
347 address ptr = (address)(_pc_start + i);
348 int a_byte = (*ptr) & 0xFF;
349 __ emit_int8 (a_byte);
350 }
351 }
352
353 address end_of_patch = __ pc();
354 int bytes_to_skip = 0;
355 if (_id == load_mirror_id) {
356 int offset = __ offset();
357 __ block_comment(" being_initialized check");
358
359 // Static field accesses have special semantics while the class
360 // initializer is being run so we emit a test which can be used to
361 // check that this code is being executed by the initializing
362 // thread.
363 assert(_obj != noreg, "must be a valid register");
364 assert(_index >= 0, "must have oop index");
365 __ mr(R0, _obj); // spill
366 __ ld(_obj, java_lang_Class::klass_offset_in_bytes(), _obj);
367 __ ld(_obj, in_bytes(InstanceKlass::init_thread_offset()), _obj);
368 __ cmpd(CCR0, _obj, R16_thread);
369 __ mr(_obj, R0); // restore
370 __ bne(CCR0, call_patch);
371
372 // Load_klass patches may execute the patched code before it's
373 // copied back into place so we need to jump back into the main
374 // code of the nmethod to continue execution.
375 __ b(_patch_site_continuation);
376
377 // Make sure this extra code gets skipped.
378 bytes_to_skip += __ offset() - offset;
379 }
380
381 // Now emit the patch record telling the runtime how to find the
382 // pieces of the patch. We only need 3 bytes but it has to be
383 // aligned as an instruction so emit 4 bytes.
384 int sizeof_patch_record = 4;
385 bytes_to_skip += sizeof_patch_record;
386
387 // Emit the offsets needed to find the code to patch.
388 int being_initialized_entry_offset = __ offset() - being_initialized_entry + sizeof_patch_record;
389
390 // Emit the patch record. We need to emit a full word, so emit an extra empty byte.
391 __ emit_int8(0);
392 __ emit_int8(being_initialized_entry_offset);
393 __ emit_int8(bytes_to_skip);
394 __ emit_int8(_bytes_to_copy);
395 address patch_info_pc = __ pc();
396 assert(patch_info_pc - end_of_patch == bytes_to_skip, "incorrect patch info");
397
398 address entry = __ pc();
399 NativeGeneralJump::insert_unconditional((address)_pc_start, entry);
400 address target = NULL;
401 relocInfo::relocType reloc_type = relocInfo::none;
402 switch (_id) {
403 case access_field_id: target = Runtime1::entry_for(Runtime1::access_field_patching_id); break;
404 case load_klass_id: target = Runtime1::entry_for(Runtime1::load_klass_patching_id);
405 reloc_type = relocInfo::metadata_type; break;
406 case load_mirror_id: target = Runtime1::entry_for(Runtime1::load_mirror_patching_id);
407 reloc_type = relocInfo::oop_type; break;
408 case load_appendix_id: target = Runtime1::entry_for(Runtime1::load_appendix_patching_id);
409 reloc_type = relocInfo::oop_type; break;
410 default: ShouldNotReachHere();
411 }
412 __ bind(call_patch);
413
414 __ block_comment("patch entry point");
415 //__ load_const(R0, target); + mtctr + bctrl must have size -_patch_info_offset
416 __ load_const32(R0, MacroAssembler::offset_to_global_toc(target));
417 __ add(R0, R29_TOC, R0);
418 __ mtctr(R0);
419 __ bctrl();
420 assert(_patch_info_offset == (patch_info_pc - __ pc()), "must not change");
421 ce->add_call_info_here(_info);
422 __ b(_patch_site_entry);
423 if (_id == load_klass_id || _id == load_mirror_id || _id == load_appendix_id) {
424 CodeSection* cs = __ code_section();
425 address pc = (address)_pc_start;
426 RelocIterator iter(cs, pc, pc + 1);
427 relocInfo::change_reloc_info_for_address(&iter, (address) pc, reloc_type, relocInfo::none);
428 }
429 }
430
431
432 void DeoptimizeStub::emit_code(LIR_Assembler* ce) {
433 __ bind(_entry);
434 address stub = Runtime1::entry_for(Runtime1::deoptimize_id);
435 //__ load_const_optimized(R0, stub);
436 __ add_const_optimized(R0, R29_TOC, MacroAssembler::offset_to_global_toc(stub));
437 __ mtctr(R0);
438
439 __ load_const_optimized(R0, _trap_request); // Pass trap request in R0.
440 __ bctrl();
441 ce->add_call_info_here(_info);
442 debug_only(__ illtrap());
443 }
444
445
446 void ArrayCopyStub::emit_code(LIR_Assembler* ce) {
447 //---------------slow case: call to native-----------------
448 __ bind(_entry);
449 __ mr(R3_ARG1, src()->as_register());
450 __ extsw(R4_ARG2, src_pos()->as_register());
451 __ mr(R5_ARG3, dst()->as_register());
452 __ extsw(R6_ARG4, dst_pos()->as_register());
453 __ extsw(R7_ARG5, length()->as_register());
454
455 ce->emit_static_call_stub();
456
457 bool success = ce->emit_trampoline_stub_for_call(SharedRuntime::get_resolve_static_call_stub());
458 if (!success) { return; }
459
460 __ relocate(relocInfo::static_call_type);
461 // Note: At this point we do not have the address of the trampoline
462 // stub, and the entry point might be too far away for bl, so __ pc()
463 // serves as dummy and the bl will be patched later.
464 __ code()->set_insts_mark();
465 __ bl(__ pc());
466 ce->add_call_info_here(info());
467 ce->verify_oop_map(info());
468
469 #ifndef PRODUCT
470 const address counter = (address)&Runtime1::_arraycopy_slowcase_cnt;
471 const Register tmp = R3, tmp2 = R4;
472 int simm16_offs = __ load_const_optimized(tmp, counter, tmp2, true);
473 __ lwz(tmp2, simm16_offs, tmp);
474 __ addi(tmp2, tmp2, 1);
475 __ stw(tmp2, simm16_offs, tmp);
476 #endif
477
478 __ b(_continuation);
479 }
480
481
482 ///////////////////////////////////////////////////////////////////////////////////
483 #if INCLUDE_ALL_GCS
484
485 void G1PreBarrierStub::emit_code(LIR_Assembler* ce) {
486 // At this point we know that marking is in progress.
487 // If do_load() is true then we have to emit the
488 // load of the previous value; otherwise it has already
489 // been loaded into _pre_val.
490
491 __ bind(_entry);
492
493 assert(pre_val()->is_register(), "Precondition.");
494 Register pre_val_reg = pre_val()->as_register();
495
496 if (do_load()) {
497 ce->mem2reg(addr(), pre_val(), T_OBJECT, patch_code(), info(), false /*wide*/, false /*unaligned*/);
498 }
499
500 __ cmpdi(CCR0, pre_val_reg, 0);
501 __ bc_far_optimized(Assembler::bcondCRbiIs1, __ bi0(CCR0, Assembler::equal), _continuation);
502
503 address stub = Runtime1::entry_for(Runtime1::Runtime1::g1_pre_barrier_slow_id);
504 //__ load_const_optimized(R0, stub);
505 __ add_const_optimized(R0, R29_TOC, MacroAssembler::offset_to_global_toc(stub));
506 __ std(pre_val_reg, -8, R1_SP); // Pass pre_val on stack.
507 __ mtctr(R0);
508 __ bctrl();
509 __ b(_continuation);
510 }
511
512 void G1PostBarrierStub::emit_code(LIR_Assembler* ce) {
513 __ bind(_entry);
514
515 assert(addr()->is_register(), "Precondition.");
516 assert(new_val()->is_register(), "Precondition.");
517 Register addr_reg = addr()->as_pointer_register();
518 Register new_val_reg = new_val()->as_register();
519
520 __ cmpdi(CCR0, new_val_reg, 0);
521 __ bc_far_optimized(Assembler::bcondCRbiIs1, __ bi0(CCR0, Assembler::equal), _continuation);
522
523 address stub = Runtime1::entry_for(Runtime1::Runtime1::g1_post_barrier_slow_id);
524 //__ load_const_optimized(R0, stub);
525 __ add_const_optimized(R0, R29_TOC, MacroAssembler::offset_to_global_toc(stub));
526 __ mtctr(R0);
527 __ mr(R0, addr_reg); // Pass addr in R0.
528 __ bctrl();
529 __ b(_continuation);
530 }
531
532 #endif // INCLUDE_ALL_GCS
533 ///////////////////////////////////////////////////////////////////////////////////
534
535 #undef __