1 /*
2 * Copyright (c) 1999, 2018, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2012, 2018 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 "asm/macroAssembler.inline.hpp"
28 #include "c1/c1_CodeStubs.hpp"
29 #include "c1/c1_FrameMap.hpp"
30 #include "c1/c1_LIRAssembler.hpp"
31 #include "c1/c1_MacroAssembler.hpp"
32 #include "c1/c1_Runtime1.hpp"
33 #include "nativeInst_ppc.hpp"
34 #include "runtime/sharedRuntime.hpp"
35 #include "utilities/macros.hpp"
36 #include "vmreg_ppc.inline.hpp"
37
38 #define __ ce->masm()->
39
40
41 RangeCheckStub::RangeCheckStub(CodeEmitInfo* info, LIR_Opr index, LIR_Opr array)
42 : _index(index), _array(array), _throw_index_out_of_bounds_exception(false) {
43 assert(info != NULL, "must have info");
44 _info = new CodeEmitInfo(info);
45 }
46
47 RangeCheckStub::RangeCheckStub(CodeEmitInfo* info, LIR_Opr index)
48 : _index(index), _array(NULL), _throw_index_out_of_bounds_exception(true) {
49 assert(info != NULL, "must have info");
50 _info = new CodeEmitInfo(info);
51 }
52
53 void RangeCheckStub::emit_code(LIR_Assembler* ce) {
54 __ bind(_entry);
55
56 if (_info->deoptimize_on_exception()) {
57 address a = Runtime1::entry_for(Runtime1::predicate_failed_trap_id);
58 // May be used by optimizations like LoopInvariantCodeMotion or RangeCheckEliminator.
59 DEBUG_ONLY( __ untested("RangeCheckStub: predicate_failed_trap_id"); )
60 //__ load_const_optimized(R0, a);
61 __ add_const_optimized(R0, R29_TOC, MacroAssembler::offset_to_global_toc(a));
62 __ mtctr(R0);
63 __ bctrl();
64 ce->add_call_info_here(_info);
65 ce->verify_oop_map(_info);
66 debug_only(__ illtrap());
67 return;
68 }
69
70 address stub = _throw_index_out_of_bounds_exception ? Runtime1::entry_for(Runtime1::throw_index_exception_id)
71 : Runtime1::entry_for(Runtime1::throw_range_check_failed_id);
72 //__ load_const_optimized(R0, stub);
73 __ add_const_optimized(R0, R29_TOC, MacroAssembler::offset_to_global_toc(stub));
74 __ mtctr(R0);
75
76 Register index = R0;
77 if (_index->is_register()) {
78 __ extsw(index, _index->as_register());
79 } else {
80 __ load_const_optimized(index, _index->as_jint());
81 }
82 if (_array) {
83 __ std(_array->as_pointer_register(), -8, R1_SP);
84 }
85 __ std(index, -16, R1_SP);
86
87 __ bctrl();
88 ce->add_call_info_here(_info);
89 ce->verify_oop_map(_info);
90 debug_only(__ illtrap());
91 }
92
93
94 PredicateFailedStub::PredicateFailedStub(CodeEmitInfo* info) {
95 _info = new CodeEmitInfo(info);
96 }
97
98 void PredicateFailedStub::emit_code(LIR_Assembler* ce) {
99 __ bind(_entry);
100 address a = Runtime1::entry_for(Runtime1::predicate_failed_trap_id);
101 //__ load_const_optimized(R0, a);
102 __ add_const_optimized(R0, R29_TOC, MacroAssembler::offset_to_global_toc(a));
103 __ mtctr(R0);
104 __ bctrl();
105 ce->add_call_info_here(_info);
106 ce->verify_oop_map(_info);
107 debug_only(__ illtrap());
108 }
109
110
111 void CounterOverflowStub::emit_code(LIR_Assembler* ce) {
112 __ bind(_entry);
113
114 // Parameter 1: bci
115 __ load_const_optimized(R0, _bci);
116 __ std(R0, -16, R1_SP);
117
118 // Parameter 2: Method*
119 Metadata *m = _method->as_constant_ptr()->as_metadata();
120 AddressLiteral md = __ constant_metadata_address(m); // Notify OOP recorder (don't need the relocation).
121 __ load_const_optimized(R0, md.value());
122 __ std(R0, -8, R1_SP);
123
124 address a = Runtime1::entry_for(Runtime1::counter_overflow_id);
125 //__ load_const_optimized(R0, a);
126 __ add_const_optimized(R0, R29_TOC, MacroAssembler::offset_to_global_toc(a));
127 __ mtctr(R0);
128 __ bctrl();
129 ce->add_call_info_here(_info);
130 ce->verify_oop_map(_info);
131
132 __ b(_continuation);
133 }
134
135
136 void DivByZeroStub::emit_code(LIR_Assembler* ce) {
137 if (_offset != -1) {
138 ce->compilation()->implicit_exception_table()->append(_offset, __ offset());
139 }
140 __ bind(_entry);
141 address stub = Runtime1::entry_for(Runtime1::throw_div0_exception_id);
142 //__ load_const_optimized(R0, stub);
143 __ add_const_optimized(R0, R29_TOC, MacroAssembler::offset_to_global_toc(stub));
144 __ mtctr(R0);
145 __ bctrl();
146 ce->add_call_info_here(_info);
147 ce->verify_oop_map(_info);
148 debug_only(__ illtrap());
149 }
150
151
152 void ImplicitNullCheckStub::emit_code(LIR_Assembler* ce) {
153 address a;
154 if (_info->deoptimize_on_exception()) {
155 // Deoptimize, do not throw the exception, because it is probably wrong to do it here.
156 a = Runtime1::entry_for(Runtime1::predicate_failed_trap_id);
157 } else {
158 a = Runtime1::entry_for(Runtime1::throw_null_pointer_exception_id);
159 }
160
161 if (ImplicitNullChecks || TrapBasedNullChecks) {
162 ce->compilation()->implicit_exception_table()->append(_offset, __ offset());
163 }
164 __ bind(_entry);
165 //__ load_const_optimized(R0, a);
166 __ add_const_optimized(R0, R29_TOC, MacroAssembler::offset_to_global_toc(a));
167 __ mtctr(R0);
168 __ bctrl();
169 ce->add_call_info_here(_info);
170 ce->verify_oop_map(_info);
171 debug_only(__ illtrap());
172 }
173
174
175 // Implementation of SimpleExceptionStub
176 void SimpleExceptionStub::emit_code(LIR_Assembler* ce) {
177 __ bind(_entry);
178 address stub = Runtime1::entry_for(_stub);
179 //__ load_const_optimized(R0, stub);
180 __ add_const_optimized(R0, R29_TOC, MacroAssembler::offset_to_global_toc(stub));
181 if (_obj->is_valid()) { __ mr_if_needed(/*tmp1 in do_CheckCast*/ R4_ARG2, _obj->as_register()); }
182 __ mtctr(R0);
183 __ bctrl();
184 ce->add_call_info_here(_info);
185 debug_only( __ illtrap(); )
186 }
187
188
189 // Implementation of NewInstanceStub
190 NewInstanceStub::NewInstanceStub(LIR_Opr klass_reg, LIR_Opr result, ciInstanceKlass* klass, CodeEmitInfo* info, Runtime1::StubID stub_id) {
191 _result = result;
192 _klass = klass;
193 _klass_reg = klass_reg;
194 _info = new CodeEmitInfo(info);
195 assert(stub_id == Runtime1::new_instance_id ||
196 stub_id == Runtime1::fast_new_instance_id ||
197 stub_id == Runtime1::fast_new_instance_init_check_id,
198 "need new_instance id");
199 _stub_id = stub_id;
200 }
201
202 void NewInstanceStub::emit_code(LIR_Assembler* ce) {
203 __ bind(_entry);
204
205 address entry = Runtime1::entry_for(_stub_id);
206 //__ load_const_optimized(R0, entry);
207 __ add_const_optimized(R0, R29_TOC, MacroAssembler::offset_to_global_toc(entry));
208 __ mtctr(R0);
209 __ bctrl();
210 ce->add_call_info_here(_info);
211 ce->verify_oop_map(_info);
212 __ b(_continuation);
213 }
214
215
216 // Implementation of NewTypeArrayStub
217 NewTypeArrayStub::NewTypeArrayStub(LIR_Opr klass_reg, LIR_Opr length, LIR_Opr result, CodeEmitInfo* info) {
218 _klass_reg = klass_reg;
219 _length = length;
220 _result = result;
221 _info = new CodeEmitInfo(info);
222 }
223
224 void NewTypeArrayStub::emit_code(LIR_Assembler* ce) {
225 __ bind(_entry);
226
227 address entry = Runtime1::entry_for(Runtime1::new_type_array_id);
228 //__ load_const_optimized(R0, entry);
229 __ add_const_optimized(R0, R29_TOC, MacroAssembler::offset_to_global_toc(entry));
230 __ mr_if_needed(/*op->tmp1()->as_register()*/ R5_ARG3, _length->as_register()); // already sign-extended
231 __ mtctr(R0);
232 __ bctrl();
233 ce->add_call_info_here(_info);
234 ce->verify_oop_map(_info);
235 __ b(_continuation);
236 }
237
238
239 // Implementation of NewObjectArrayStub
240 NewObjectArrayStub::NewObjectArrayStub(LIR_Opr klass_reg, LIR_Opr length, LIR_Opr result, CodeEmitInfo* info) {
241 _klass_reg = klass_reg;
242 _length = length;
243 _result = result;
244 _info = new CodeEmitInfo(info);
245 }
246
247 void NewObjectArrayStub::emit_code(LIR_Assembler* ce) {
248 __ bind(_entry);
249
250 address entry = Runtime1::entry_for(Runtime1::new_object_array_id);
251 //__ load_const_optimized(R0, entry);
252 __ add_const_optimized(R0, R29_TOC, MacroAssembler::offset_to_global_toc(entry));
253 __ mr_if_needed(/*op->tmp1()->as_register()*/ R5_ARG3, _length->as_register()); // already sign-extended
254 __ mtctr(R0);
255 __ bctrl();
256 ce->add_call_info_here(_info);
257 ce->verify_oop_map(_info);
258 __ b(_continuation);
259 }
260
261
262 // Implementation of MonitorAccessStubs
263 MonitorEnterStub::MonitorEnterStub(LIR_Opr obj_reg, LIR_Opr lock_reg, CodeEmitInfo* info)
264 : MonitorAccessStub(obj_reg, lock_reg) {
265 _info = new CodeEmitInfo(info);
266 }
267
268 void MonitorEnterStub::emit_code(LIR_Assembler* ce) {
269 __ bind(_entry);
270 address stub = Runtime1::entry_for(ce->compilation()->has_fpu_code() ? Runtime1::monitorenter_id : Runtime1::monitorenter_nofpu_id);
271 //__ load_const_optimized(R0, stub);
272 __ add_const_optimized(R0, R29_TOC, MacroAssembler::offset_to_global_toc(stub));
273 __ mr_if_needed(/*scratch_opr()->as_register()*/ R4_ARG2, _obj_reg->as_register());
274 assert(_lock_reg->as_register() == R5_ARG3, "");
275 __ mtctr(R0);
276 __ bctrl();
277 ce->add_call_info_here(_info);
278 ce->verify_oop_map(_info);
279 __ b(_continuation);
280 }
281
282 void MonitorExitStub::emit_code(LIR_Assembler* ce) {
283 __ bind(_entry);
284 if (_compute_lock) {
285 ce->monitor_address(_monitor_ix, _lock_reg);
286 }
287 address stub = Runtime1::entry_for(ce->compilation()->has_fpu_code() ? Runtime1::monitorexit_id : Runtime1::monitorexit_nofpu_id);
288 //__ load_const_optimized(R0, stub);
289 __ add_const_optimized(R0, R29_TOC, MacroAssembler::offset_to_global_toc(stub));
290 assert(_lock_reg->as_register() == R4_ARG2, "");
291 __ mtctr(R0);
292 __ bctrl();
293 __ b(_continuation);
294 }
295
296
297 // Implementation of patching:
298 // - Copy the code at given offset to an inlined buffer (first the bytes, then the number of bytes).
299 // - Replace original code with a call to the stub.
300 // At Runtime:
301 // - call to stub, jump to runtime
302 // - in runtime: preserve all registers (especially objects, i.e., source and destination object)
303 // - in runtime: after initializing class, restore original code, reexecute instruction
304
305 int PatchingStub::_patch_info_offset = -(5 * BytesPerInstWord);
306
307 int PatchingStub::patch_info_offset() { return _patch_info_offset; }
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 #undef __