1 /*
2 * Copyright (c) 2008, 2020, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "asm/macroAssembler.inline.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 "classfile/javaClasses.hpp"
33 #include "memory/universe.hpp"
34 #include "nativeInst_arm.hpp"
35 #include "runtime/sharedRuntime.hpp"
36 #include "utilities/macros.hpp"
37 #include "vmreg_arm.inline.hpp"
38
39 #define __ ce->masm()->
40
41 void C1SafepointPollStub::emit_code(LIR_Assembler* ce) {
42 ShouldNotReachHere();
43 }
44
45 void CounterOverflowStub::emit_code(LIR_Assembler* ce) {
46 __ bind(_entry);
47 ce->store_parameter(_bci, 0);
48 ce->store_parameter(_method->as_constant_ptr()->as_metadata(), 1);
49 __ call(Runtime1::entry_for(Runtime1::counter_overflow_id), relocInfo::runtime_call_type);
50 ce->add_call_info_here(_info);
51 ce->verify_oop_map(_info);
52
53 __ b(_continuation);
54 }
55
56
57 // TODO: ARM - is it possible to inline these stubs into the main code stream?
58
59
60 RangeCheckStub::RangeCheckStub(CodeEmitInfo* info, LIR_Opr index, LIR_Opr array)
61 : _index(index), _array(array), _throw_index_out_of_bounds_exception(false) {
62 assert(info != NULL, "must have info");
63 _info = new CodeEmitInfo(info);
64 }
65
66 RangeCheckStub::RangeCheckStub(CodeEmitInfo* info, LIR_Opr index)
67 : _index(index), _array(NULL), _throw_index_out_of_bounds_exception(true) {
68 assert(info != NULL, "must have info");
69 _info = new CodeEmitInfo(info);
70 }
71
72 void RangeCheckStub::emit_code(LIR_Assembler* ce) {
73 __ bind(_entry);
74
75 if (_info->deoptimize_on_exception()) {
76 __ call(Runtime1::entry_for(Runtime1::predicate_failed_trap_id), relocInfo::runtime_call_type);
77 ce->add_call_info_here(_info);
78 ce->verify_oop_map(_info);
79 debug_only(__ should_not_reach_here());
80 return;
81 }
82 // Pass the array index on stack because all registers must be preserved
83 ce->verify_reserved_argument_area_size(_throw_index_out_of_bounds_exception ? 1 : 2);
84 if (_index->is_cpu_register()) {
85 __ str_32(_index->as_register(), Address(SP));
86 } else {
87 __ mov_slow(Rtemp, _index->as_jint()); // Rtemp should be OK in C1
88 __ str_32(Rtemp, Address(SP));
89 }
90
91 if (_throw_index_out_of_bounds_exception) {
92 __ call(Runtime1::entry_for(Runtime1::throw_index_exception_id), relocInfo::runtime_call_type);
93 } else {
94 __ str(_array->as_pointer_register(), Address(SP, BytesPerWord)); // ??? Correct offset? Correct instruction?
95 __ call(Runtime1::entry_for(Runtime1::throw_range_check_failed_id), relocInfo::runtime_call_type);
96 }
97 ce->add_call_info_here(_info);
98 ce->verify_oop_map(_info);
99 DEBUG_ONLY(STOP("RangeCheck");)
100 }
101
102 PredicateFailedStub::PredicateFailedStub(CodeEmitInfo* info) {
103 _info = new CodeEmitInfo(info);
104 }
105
106 void PredicateFailedStub::emit_code(LIR_Assembler* ce) {
107 __ bind(_entry);
108 __ call(Runtime1::entry_for(Runtime1::predicate_failed_trap_id), relocInfo::runtime_call_type);
109 ce->add_call_info_here(_info);
110 ce->verify_oop_map(_info);
111 debug_only(__ should_not_reach_here());
112 }
113
114 void DivByZeroStub::emit_code(LIR_Assembler* ce) {
115 if (_offset != -1) {
116 ce->compilation()->implicit_exception_table()->append(_offset, __ offset());
117 }
118 __ bind(_entry);
119 __ call(Runtime1::entry_for(Runtime1::throw_div0_exception_id),
120 relocInfo::runtime_call_type);
121 ce->add_call_info_here(_info);
122 DEBUG_ONLY(STOP("DivByZero");)
123 }
124
125
126 // Implementation of NewInstanceStub
127
128 NewInstanceStub::NewInstanceStub(LIR_Opr klass_reg, LIR_Opr result, ciInstanceKlass* klass, CodeEmitInfo* info, Runtime1::StubID stub_id) {
129 _result = result;
130 _klass = klass;
131 _klass_reg = klass_reg;
132 _info = new CodeEmitInfo(info);
133 assert(stub_id == Runtime1::new_instance_id ||
134 stub_id == Runtime1::fast_new_instance_id ||
135 stub_id == Runtime1::fast_new_instance_init_check_id,
136 "need new_instance id");
137 _stub_id = stub_id;
138 }
139
140
141 void NewInstanceStub::emit_code(LIR_Assembler* ce) {
142 assert(_result->as_register() == R0, "runtime call setup");
143 assert(_klass_reg->as_register() == R1, "runtime call setup");
144 __ bind(_entry);
145 __ call(Runtime1::entry_for(_stub_id), relocInfo::runtime_call_type);
146 ce->add_call_info_here(_info);
147 ce->verify_oop_map(_info);
148 __ b(_continuation);
149 }
150
151
152 // Implementation of NewTypeArrayStub
153
154 NewTypeArrayStub::NewTypeArrayStub(LIR_Opr klass_reg, LIR_Opr length, LIR_Opr result, CodeEmitInfo* info) {
155 _klass_reg = klass_reg;
156 _length = length;
157 _result = result;
158 _info = new CodeEmitInfo(info);
159 }
160
161
162 void NewTypeArrayStub::emit_code(LIR_Assembler* ce) {
163 assert(_result->as_register() == R0, "runtime call setup");
164 assert(_klass_reg->as_register() == R1, "runtime call setup");
165 assert(_length->as_register() == R2, "runtime call setup");
166 __ bind(_entry);
167 __ call(Runtime1::entry_for(Runtime1::new_type_array_id), relocInfo::runtime_call_type);
168 ce->add_call_info_here(_info);
169 ce->verify_oop_map(_info);
170 __ b(_continuation);
171 }
172
173
174 // Implementation of NewObjectArrayStub
175
176 NewObjectArrayStub::NewObjectArrayStub(LIR_Opr klass_reg, LIR_Opr length, LIR_Opr result, CodeEmitInfo* info) {
177 _klass_reg = klass_reg;
178 _result = result;
179 _length = length;
180 _info = new CodeEmitInfo(info);
181 }
182
183
184 void NewObjectArrayStub::emit_code(LIR_Assembler* ce) {
185 assert(_result->as_register() == R0, "runtime call setup");
186 assert(_klass_reg->as_register() == R1, "runtime call setup");
187 assert(_length->as_register() == R2, "runtime call setup");
188 __ bind(_entry);
189 __ call(Runtime1::entry_for(Runtime1::new_object_array_id), relocInfo::runtime_call_type);
190 ce->add_call_info_here(_info);
191 ce->verify_oop_map(_info);
192 __ b(_continuation);
193 }
194
195
196 // Implementation of MonitorAccessStubs
197
198 MonitorEnterStub::MonitorEnterStub(LIR_Opr obj_reg, LIR_Opr lock_reg, CodeEmitInfo* info)
199 : MonitorAccessStub(obj_reg, lock_reg)
200 {
201 _info = new CodeEmitInfo(info);
202 }
203
204
205 void MonitorEnterStub::emit_code(LIR_Assembler* ce) {
206 __ bind(_entry);
207 const Register obj_reg = _obj_reg->as_pointer_register();
208 const Register lock_reg = _lock_reg->as_pointer_register();
209
210 ce->verify_reserved_argument_area_size(2);
211 if (obj_reg < lock_reg) {
212 __ stmia(SP, RegisterSet(obj_reg) | RegisterSet(lock_reg));
213 } else {
214 __ str(obj_reg, Address(SP));
215 __ str(lock_reg, Address(SP, BytesPerWord));
216 }
217
218 Runtime1::StubID enter_id = ce->compilation()->has_fpu_code() ?
219 Runtime1::monitorenter_id :
220 Runtime1::monitorenter_nofpu_id;
221 __ call(Runtime1::entry_for(enter_id), relocInfo::runtime_call_type);
222 ce->add_call_info_here(_info);
223 ce->verify_oop_map(_info);
224 __ b(_continuation);
225 }
226
227
228 void MonitorExitStub::emit_code(LIR_Assembler* ce) {
229 __ bind(_entry);
230 if (_compute_lock) {
231 ce->monitor_address(_monitor_ix, _lock_reg);
232 }
233 const Register lock_reg = _lock_reg->as_pointer_register();
234
235 ce->verify_reserved_argument_area_size(1);
236 __ str(lock_reg, Address(SP));
237
238 // Non-blocking leaf routine - no call info needed
239 Runtime1::StubID exit_id = ce->compilation()->has_fpu_code() ?
240 Runtime1::monitorexit_id :
241 Runtime1::monitorexit_nofpu_id;
242 __ call(Runtime1::entry_for(exit_id), relocInfo::runtime_call_type);
243 __ b(_continuation);
244 }
245
246 void LoadKlassStub::emit_code(LIR_Assembler* ce) {
247 Unimplemented(); // Only needed with compact object headers.
248 }
249
250 // Call return is directly after patch word
251 int PatchingStub::_patch_info_offset = 0;
252
253 void PatchingStub::align_patch_site(MacroAssembler* masm) {
254 #if 0
255 // TODO: investigate if we required to implement this
256 ShouldNotReachHere();
257 #endif
258 }
259
260 void PatchingStub::emit_code(LIR_Assembler* ce) {
261 const int patchable_instruction_offset = 0;
262
263 assert(NativeCall::instruction_size <= _bytes_to_copy && _bytes_to_copy <= 0xFF,
264 "not enough room for call");
265 assert((_bytes_to_copy & 3) == 0, "must copy a multiple of four bytes");
266 Label call_patch;
267 bool is_load = (_id == load_klass_id) || (_id == load_mirror_id) || (_id == load_appendix_id);
268
269
270 if (is_load && !VM_Version::supports_movw()) {
271 address start = __ pc();
272
273 // The following sequence duplicates code provided in MacroAssembler::patchable_mov_oop()
274 // without creating relocation info entry.
275
276 assert((__ pc() - start) == patchable_instruction_offset, "should be");
277 __ ldr(_obj, Address(PC));
278 // Extra nop to handle case of large offset of oop placeholder (see NativeMovConstReg::set_data).
279 __ nop();
280
281 #ifdef ASSERT
282 for (int i = 0; i < _bytes_to_copy; i++) {
283 assert(((address)_pc_start)[i] == start[i], "should be the same code");
284 }
285 #endif // ASSERT
286 }
287
288 address being_initialized_entry = __ pc();
289 if (CommentedAssembly) {
290 __ block_comment(" patch template");
291 }
292 if (is_load) {
293 address start = __ pc();
294 if (_id == load_mirror_id || _id == load_appendix_id) {
295 __ patchable_mov_oop(_obj, (jobject)Universe::non_oop_word(), _index);
296 } else {
297 __ patchable_mov_metadata(_obj, (Metadata*)Universe::non_oop_word(), _index);
298 }
299 #ifdef ASSERT
300 for (int i = 0; i < _bytes_to_copy; i++) {
301 assert(((address)_pc_start)[i] == start[i], "should be the same code");
302 }
303 #endif // ASSERT
304 } else {
305 int* start = (int*)_pc_start;
306 int* end = start + (_bytes_to_copy / BytesPerInt);
307 while (start < end) {
308 __ emit_int32(*start++);
309 }
310 }
311 address end_of_patch = __ pc();
312
313 int bytes_to_skip = 0;
314 if (_id == load_mirror_id) {
315 int offset = __ offset();
316 if (CommentedAssembly) {
317 __ block_comment(" being_initialized check");
318 }
319
320 assert(_obj != noreg, "must be a valid register");
321 // Rtemp should be OK in C1
322 __ ldr(Rtemp, Address(_obj, java_lang_Class::klass_offset()));
323 __ ldr(Rtemp, Address(Rtemp, InstanceKlass::init_thread_offset()));
324 __ cmp(Rtemp, Rthread);
325 __ b(call_patch, ne);
326 __ b(_patch_site_continuation);
327
328 bytes_to_skip += __ offset() - offset;
329 }
330
331 if (CommentedAssembly) {
332 __ block_comment("patch data - 3 high bytes of the word");
333 }
334 const int sizeof_patch_record = 4;
335 bytes_to_skip += sizeof_patch_record;
336 int being_initialized_entry_offset = __ pc() - being_initialized_entry + sizeof_patch_record;
337 __ emit_int32(0xff | being_initialized_entry_offset << 8 | bytes_to_skip << 16 | _bytes_to_copy << 24);
338
339 address patch_info_pc = __ pc();
340 assert(patch_info_pc - end_of_patch == bytes_to_skip, "incorrect patch info");
341
342 // runtime call will return here
343 Label call_return;
344 __ bind(call_return);
345 ce->add_call_info_here(_info);
346 assert(_patch_info_offset == (patch_info_pc - __ pc()), "must not change");
347 __ b(_patch_site_entry);
348
349 address entry = __ pc();
350 NativeGeneralJump::insert_unconditional((address)_pc_start, entry);
351 address target = NULL;
352 relocInfo::relocType reloc_type = relocInfo::none;
353 switch (_id) {
354 case access_field_id: target = Runtime1::entry_for(Runtime1::access_field_patching_id); break;
355 case load_klass_id: target = Runtime1::entry_for(Runtime1::load_klass_patching_id); reloc_type = relocInfo::metadata_type; break;
356 case load_mirror_id: target = Runtime1::entry_for(Runtime1::load_mirror_patching_id); reloc_type = relocInfo::oop_type; break;
357 case load_appendix_id: target = Runtime1::entry_for(Runtime1::load_appendix_patching_id); reloc_type = relocInfo::oop_type; break;
358 default: ShouldNotReachHere();
359 }
360 __ bind(call_patch);
361
362 if (CommentedAssembly) {
363 __ block_comment("patch entry point");
364 }
365
366 // arrange for call to return just after patch word
367 __ adr(LR, call_return);
368 __ jump(target, relocInfo::runtime_call_type, Rtemp);
369
370 if (is_load) {
371 CodeSection* cs = __ code_section();
372 address pc = (address)_pc_start;
373 RelocIterator iter(cs, pc, pc + 1);
374 relocInfo::change_reloc_info_for_address(&iter, pc, reloc_type, relocInfo::none);
375 }
376 }
377
378 void DeoptimizeStub::emit_code(LIR_Assembler* ce) {
379 __ bind(_entry);
380 __ mov_slow(Rtemp, _trap_request);
381 ce->verify_reserved_argument_area_size(1);
382 __ str(Rtemp, Address(SP));
383 __ call(Runtime1::entry_for(Runtime1::deoptimize_id), relocInfo::runtime_call_type);
384 ce->add_call_info_here(_info);
385 DEBUG_ONLY(__ should_not_reach_here());
386 }
387
388
389 void ImplicitNullCheckStub::emit_code(LIR_Assembler* ce) {
390 address a;
391 if (_info->deoptimize_on_exception()) {
392 // Deoptimize, do not throw the exception, because it is
393 // probably wrong to do it here.
394 a = Runtime1::entry_for(Runtime1::predicate_failed_trap_id);
395 } else {
396 a = Runtime1::entry_for(Runtime1::throw_null_pointer_exception_id);
397 }
398 ce->compilation()->implicit_exception_table()->append(_offset, __ offset());
399 __ bind(_entry);
400 __ call(a, relocInfo::runtime_call_type);
401 ce->add_call_info_here(_info);
402 ce->verify_oop_map(_info);
403 DEBUG_ONLY(STOP("ImplicitNullCheck");)
404 }
405
406
407 void SimpleExceptionStub::emit_code(LIR_Assembler* ce) {
408 __ bind(_entry);
409 // Pass the object on stack because all registers must be preserved
410 if (_obj->is_cpu_register()) {
411 ce->verify_reserved_argument_area_size(1);
412 __ str(_obj->as_pointer_register(), Address(SP));
413 } else {
414 assert(_obj->is_illegal(), "should be");
415 }
416 __ call(Runtime1::entry_for(_stub), relocInfo::runtime_call_type);
417 ce->add_call_info_here(_info);
418 DEBUG_ONLY(STOP("SimpleException");)
419 }
420
421
422 void ArrayCopyStub::emit_code(LIR_Assembler* ce) {
423 __ bind(_entry);
424
425 VMRegPair args[5];
426 BasicType signature[5] = { T_OBJECT, T_INT, T_OBJECT, T_INT, T_INT };
427 SharedRuntime::java_calling_convention(signature, args, 5);
428
429 Register r[5];
430 r[0] = src()->as_pointer_register();
431 r[1] = src_pos()->as_register();
432 r[2] = dst()->as_pointer_register();
433 r[3] = dst_pos()->as_register();
434 r[4] = length()->as_register();
435
436 for (int i = 0; i < 5; i++) {
437 VMReg arg = args[i].first();
438 if (arg->is_stack()) {
439 __ str(r[i], Address(SP, arg->reg2stack() * VMRegImpl::stack_slot_size));
440 } else {
441 assert(r[i] == arg->as_Register(), "Calling conventions must match");
442 }
443 }
444
445 ce->emit_static_call_stub();
446 if (ce->compilation()->bailed_out()) {
447 return; // CodeCache is full
448 }
449 int ret_addr_offset = __ patchable_call(SharedRuntime::get_resolve_static_call_stub(), relocInfo::static_call_type);
450 assert(ret_addr_offset == __ offset(), "embedded return address not allowed");
451 ce->add_call_info_here(info());
452 ce->verify_oop_map(info());
453 __ b(_continuation);
454 }
455
456 #undef __