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