1 /*
2 * Copyright (c) 2016, 2026, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2016, 2023 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 "asm/macroAssembler.inline.hpp"
27 #include "c1/c1_Defs.hpp"
28 #include "c1/c1_MacroAssembler.hpp"
29 #include "c1/c1_Runtime1.hpp"
30 #include "ci/ciUtilities.hpp"
31 #include "compiler/oopMap.hpp"
32 #include "gc/shared/cardTable.hpp"
33 #include "gc/shared/cardTableBarrierSet.hpp"
34 #include "interpreter/interpreter.hpp"
35 #include "memory/universe.hpp"
36 #include "nativeInst_s390.hpp"
37 #include "oops/oop.inline.hpp"
38 #include "prims/jvmtiExport.hpp"
39 #include "register_s390.hpp"
40 #include "registerSaver_s390.hpp"
41 #include "runtime/sharedRuntime.hpp"
42 #include "runtime/signature.hpp"
43 #include "runtime/stubRoutines.hpp"
44 #include "runtime/vframeArray.hpp"
45 #include "utilities/macros.hpp"
46 #include "utilities/powerOfTwo.hpp"
47 #include "vmreg_s390.inline.hpp"
48
49 // Implementation of StubAssembler
50
51 int StubAssembler::call_RT(Register oop_result1, Register metadata_result, address entry_point, int number_of_arguments) {
52 set_num_rt_args(0); // Nothing on stack.
53 assert(!(oop_result1->is_valid() || metadata_result->is_valid()) || oop_result1 != metadata_result, "registers must be different");
54
55 Label resume;
56 z_larl(Z_R1_scratch, resume);
57 set_last_Java_frame(Z_SP, Z_R1_scratch);
58
59 // ARG1 must hold thread address.
60 z_lgr(Z_ARG1, Z_thread);
61
62 address return_pc = nullptr;
63 align_call_far_patchable(this->pc());
64 return_pc = call_c_opt(entry_point);
65
66 bind(resume);
67 int call_offset = offset();
68 assert(return_pc != nullptr, "const section overflow");
69
70 reset_last_Java_frame(/* check_last_java_sp= */ false);
71
72 // Check for pending exceptions.
73 {
74 load_and_test_long(Z_R0_scratch, Address(Z_thread, Thread::pending_exception_offset()));
75
76 // This used to conditionally jump to forward_exception however it is
77 // possible if we relocate that the branch will not reach. So we must jump
78 // around so we can always reach.
79
80 Label ok;
81 z_bre(ok); // Bcondequal is the same as bcondZero.
82
83 // exception pending => forward to exception handler
84
85 // Make sure that the vm_results are cleared.
86 if (oop_result1->is_valid()) {
87 clear_mem(Address(Z_thread, JavaThread::vm_result_oop_offset()), sizeof(jlong));
88 }
89 if (metadata_result->is_valid()) {
90 clear_mem(Address(Z_thread, JavaThread::vm_result_metadata_offset()), sizeof(jlong));
91 }
92 if (frame_size() == no_frame_size) {
93 // Pop the stub frame.
94 pop_frame();
95 restore_return_pc();
96 load_const_optimized(Z_R1, StubRoutines::forward_exception_entry());
97 z_br(Z_R1);
98 } else if (_stub_id == (int)StubId::c1_forward_exception_id) {
99 should_not_reach_here();
100 } else {
101 load_const_optimized(Z_R1, Runtime1::entry_for (StubId::c1_forward_exception_id));
102 z_br(Z_R1);
103 }
104
105 bind(ok);
106 }
107
108 // Get oop results if there are any and reset the values in the thread.
109 if (oop_result1->is_valid()) {
110 get_vm_result_oop(oop_result1);
111 }
112 if (metadata_result->is_valid()) {
113 get_vm_result_metadata(metadata_result);
114 }
115
116 return call_offset;
117 }
118
119
120 int StubAssembler::call_RT(Register oop_result1, Register metadata_result, address entry, Register arg1) {
121 // Z_ARG1 is reserved for the thread.
122 lgr_if_needed(Z_ARG2, arg1);
123 return call_RT(oop_result1, metadata_result, entry, 1);
124 }
125
126
127 int StubAssembler::call_RT(Register oop_result1, Register metadata_result, address entry, Register arg1, Register arg2) {
128 // Z_ARG1 is reserved for the thread.
129 lgr_if_needed(Z_ARG2, arg1);
130 assert(arg2 != Z_ARG2, "smashed argument");
131 lgr_if_needed(Z_ARG3, arg2);
132 return call_RT(oop_result1, metadata_result, entry, 2);
133 }
134
135
136 int StubAssembler::call_RT(Register oop_result1, Register metadata_result, address entry, Register arg1, Register arg2, Register arg3) {
137 // Z_ARG1 is reserved for the thread.
138 lgr_if_needed(Z_ARG2, arg1);
139 assert(arg2 != Z_ARG2, "smashed argument");
140 lgr_if_needed(Z_ARG3, arg2);
141 assert(arg3 != Z_ARG3, "smashed argument");
142 lgr_if_needed(Z_ARG4, arg3);
143 return call_RT(oop_result1, metadata_result, entry, 3);
144 }
145
146
147 // Implementation of Runtime1
148
149 #define __ sasm->
150
151 #ifndef PRODUCT
152 #undef __
153 #define __ (Verbose ? (sasm->block_comment(FILE_AND_LINE),sasm):sasm)->
154 #endif // !PRODUCT
155
156 #define BLOCK_COMMENT(str) if (PrintAssembly) __ block_comment(str)
157 #define BIND(label) bind(label); BLOCK_COMMENT(#label ":")
158
159 static OopMap* generate_oop_map(StubAssembler* sasm) {
160 RegisterSaver::RegisterSet reg_set = RegisterSaver::all_registers;
161 int frame_size_in_slots =
162 RegisterSaver::live_reg_frame_size(reg_set) / VMRegImpl::stack_slot_size;
163 sasm->set_frame_size(frame_size_in_slots / VMRegImpl::slots_per_word);
164 return RegisterSaver::generate_oop_map(sasm, reg_set);
165 }
166
167 static OopMap* save_live_registers(StubAssembler* sasm, bool save_fpu_registers = true, Register return_pc = Z_R14) {
168 __ block_comment("save_live_registers");
169 RegisterSaver::RegisterSet reg_set =
170 save_fpu_registers ? RegisterSaver::all_registers : RegisterSaver::all_integer_registers;
171 int frame_size_in_slots =
172 RegisterSaver::live_reg_frame_size(reg_set) / VMRegImpl::stack_slot_size;
173 sasm->set_frame_size(frame_size_in_slots / VMRegImpl::slots_per_word);
174 return RegisterSaver::save_live_registers(sasm, reg_set, return_pc);
175 }
176
177 static OopMap* save_live_registers_except_r2(StubAssembler* sasm, bool save_fpu_registers = true) {
178 if (!save_fpu_registers) {
179 __ unimplemented(FILE_AND_LINE);
180 }
181 __ block_comment("save_live_registers");
182 RegisterSaver::RegisterSet reg_set = RegisterSaver::all_registers_except_r2;
183 int frame_size_in_slots =
184 RegisterSaver::live_reg_frame_size(reg_set) / VMRegImpl::stack_slot_size;
185 sasm->set_frame_size(frame_size_in_slots / VMRegImpl::slots_per_word);
186 return RegisterSaver::save_live_registers(sasm, reg_set);
187 }
188
189 static void restore_live_registers(StubAssembler* sasm, bool restore_fpu_registers = true) {
190 __ block_comment("restore_live_registers");
191 RegisterSaver::RegisterSet reg_set =
192 restore_fpu_registers ? RegisterSaver::all_registers : RegisterSaver::all_integer_registers;
193 RegisterSaver::restore_live_registers(sasm, reg_set);
194 }
195
196 static void restore_live_registers_except_r2(StubAssembler* sasm, bool restore_fpu_registers = true) {
197 if (!restore_fpu_registers) {
198 __ unimplemented(FILE_AND_LINE);
199 }
200 __ block_comment("restore_live_registers_except_r2");
201 RegisterSaver::restore_live_registers(sasm, RegisterSaver::all_registers_except_r2);
202 }
203
204 void Runtime1::initialize_pd() {
205 // Nothing to do.
206 }
207
208 uint Runtime1::runtime_blob_current_thread_offset(frame f) {
209 CodeBlob* cb = f.cb();
210 assert(cb == Runtime1::blob_for(StubId::c1_monitorenter_id) ||
211 cb == Runtime1::blob_for(StubId::c1_monitorenter_nofpu_id), "must be");
212 assert(cb != nullptr && cb->is_runtime_stub(), "invalid frame");
213
214 // Calculate the offset of Z_thread (Z_R8) in the saved register area.
215 // Both c1_monitorenter_id and c1_monitorenter_nofpu_id have the same frame layout:
216 // - c1_monitorenter_id uses RegisterSaver::all_registers (saves FPU regs)
217 // - c1_monitorenter_nofpu_id uses RegisterSaver::all_integer_registers (excludes FPU regs but reserves space)
218 //
219 // From RegisterSaver_LiveRegs and RegisterSaver_LiveIntRegs:
220 // Both have 15 float register slots (F0, F2-F15, F1 is excluded as scratch)
221 // Then integer registers: R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13
222 // Z_thread is Z_R8, which is the 7th integer register (index 6 from R2)
223 //
224 // Stack layout from SP:
225 // [0..159] : z_abi_160
226 // [160..279] : 15 float register slots (15 * 8 = 120 bytes)
227 // [280..327] : R2-R7 (6 * 8 = 48 bytes)
228 // [328..335] : R8 (Z_thread) <- this is what we need
229 //
230 // Offset = 160 + 120 + 48 = 328 bytes from SP
231 // Return value is in 64-bit words: 328 / 8 = 41
232
233 const int float_reg_slots = 15; // F0, F2-F15 (F1 is scratch, excluded)
234 const int int_regs_before_r8 = 6; // R2, R3, R4, R5, R6, R7
235 const int z_thread_offset = frame::z_abi_160_size +
236 (float_reg_slots * 8) +
237 (int_regs_before_r8 * 8);
238
239 return z_thread_offset / wordSize;
240 }
241
242 OopMapSet* Runtime1::generate_exception_throw(StubAssembler* sasm, address target, bool has_argument) {
243 // Make a frame and preserve the caller's caller-save registers.
244 OopMap* oop_map = save_live_registers(sasm);
245 int call_offset;
246 if (!has_argument) {
247 call_offset = __ call_RT(noreg, noreg, target);
248 } else {
249 call_offset = __ call_RT(noreg, noreg, target, Z_R1_scratch, Z_R0_scratch);
250 }
251 OopMapSet* oop_maps = new OopMapSet();
252 oop_maps->add_gc_map(call_offset, oop_map);
253
254 __ should_not_reach_here();
255 return oop_maps;
256 }
257
258 void Runtime1::generate_unwind_exception(StubAssembler *sasm) {
259 // Incoming parameters: Z_EXC_OOP and Z_EXC_PC.
260 // Keep copies in callee-saved registers during runtime call.
261 const Register exception_oop_callee_saved = Z_R11;
262 const Register exception_pc_callee_saved = Z_R12;
263 // Other registers used in this stub.
264 const Register handler_addr = Z_R4;
265
266 if (AbortVMOnException) {
267 save_live_registers(sasm);
268 __ call_VM_leaf(CAST_FROM_FN_PTR(address, check_abort_on_vm_exception), Z_EXC_OOP);
269 restore_live_registers(sasm);
270 }
271
272 // Verify that only exception_oop, is valid at this time.
273 __ invalidate_registers(Z_EXC_OOP, Z_EXC_PC);
274
275 // Check that fields in JavaThread for exception oop and issuing pc are set.
276 __ asm_assert_mem8_is_zero(in_bytes(JavaThread::exception_oop_offset()), Z_thread, "exception oop already set : " FILE_AND_LINE, 0);
277 __ asm_assert_mem8_is_zero(in_bytes(JavaThread::exception_pc_offset()), Z_thread, "exception pc already set : " FILE_AND_LINE, 0);
278
279 // Save exception_oop and pc in callee-saved register to preserve it
280 // during runtime calls.
281 __ verify_not_null_oop(Z_EXC_OOP);
282 __ lgr_if_needed(exception_oop_callee_saved, Z_EXC_OOP);
283 __ lgr_if_needed(exception_pc_callee_saved, Z_EXC_PC);
284
285 __ push_frame_abi160(0); // Runtime code needs the z_abi_160.
286
287 // Search the exception handler address of the caller (using the return address).
288 __ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::exception_handler_for_return_address), Z_thread, Z_EXC_PC);
289 // Z_RET(Z_R2): exception handler address of the caller.
290
291 __ pop_frame();
292
293 __ invalidate_registers(exception_oop_callee_saved, exception_pc_callee_saved, Z_RET);
294
295 // Move result of call into correct register.
296 __ lgr_if_needed(handler_addr, Z_RET);
297
298 // Restore exception oop and pc to Z_EXC_OOP and Z_EXC_PC (required convention of exception handler).
299 __ lgr_if_needed(Z_EXC_OOP, exception_oop_callee_saved);
300 __ lgr_if_needed(Z_EXC_PC, exception_pc_callee_saved);
301
302 // Verify that there is really a valid exception in Z_EXC_OOP.
303 __ verify_not_null_oop(Z_EXC_OOP);
304
305 __ z_br(handler_addr); // Jump to exception handler.
306 }
307
308 OopMapSet* Runtime1::generate_patching(StubAssembler* sasm, address target) {
309 // Make a frame and preserve the caller's caller-save registers.
310 OopMap* oop_map = save_live_registers(sasm);
311
312 // Call the runtime patching routine, returns non-zero if nmethod got deopted.
313 int call_offset = __ call_RT(noreg, noreg, target);
314 OopMapSet* oop_maps = new OopMapSet();
315 oop_maps->add_gc_map(call_offset, oop_map);
316
317 // Re-execute the patched instruction or, if the nmethod was
318 // deoptmized, return to the deoptimization handler entry that will
319 // cause re-execution of the current bytecode.
320 DeoptimizationBlob* deopt_blob = SharedRuntime::deopt_blob();
321 assert(deopt_blob != nullptr, "deoptimization blob must have been created");
322
323 __ z_ltr(Z_RET, Z_RET); // return value == 0
324
325 restore_live_registers(sasm);
326
327 __ z_bcr(Assembler::bcondZero, Z_R14);
328
329 // Return to the deoptimization handler entry for unpacking and
330 // rexecute if we simply returned then we'd deopt as if any call we
331 // patched had just returned.
332 AddressLiteral dest(deopt_blob->unpack_with_reexecution());
333 __ load_const_optimized(Z_R1_scratch, dest);
334 __ z_br(Z_R1_scratch);
335
336 return oop_maps;
337 }
338
339 OopMapSet* Runtime1::generate_code_for(StubId id, StubAssembler* sasm) {
340
341 // for better readability
342 const bool must_gc_arguments = true;
343 const bool dont_gc_arguments = false;
344
345 // Default value; overwritten for some optimized stubs that are
346 // called from methods that do not use the fpu.
347 bool save_fpu_registers = true;
348
349 // Stub code and info for the different stubs.
350 OopMapSet* oop_maps = nullptr;
351 switch (id) {
352 case StubId::c1_forward_exception_id:
353 {
354 oop_maps = generate_handle_exception(id, sasm);
355 // will not return
356 }
357 break;
358
359 case StubId::c1_new_instance_id:
360 case StubId::c1_fast_new_instance_id:
361 case StubId::c1_fast_new_instance_init_check_id:
362 {
363 Register klass = Z_R11; // Incoming
364 Register obj = Z_R2; // Result
365
366 if (id == StubId::c1_new_instance_id) {
367 __ set_info("new_instance", dont_gc_arguments);
368 } else if (id == StubId::c1_fast_new_instance_id) {
369 __ set_info("fast new_instance", dont_gc_arguments);
370 } else {
371 assert(id == StubId::c1_fast_new_instance_init_check_id, "bad StubId");
372 __ set_info("fast new_instance init check", dont_gc_arguments);
373 }
374
375 OopMap* map = save_live_registers_except_r2(sasm);
376 int call_offset = __ call_RT(obj, noreg, CAST_FROM_FN_PTR(address, new_instance), klass);
377 oop_maps = new OopMapSet();
378 oop_maps->add_gc_map(call_offset, map);
379 restore_live_registers_except_r2(sasm);
380
381 __ verify_oop(obj, FILE_AND_LINE);
382 __ z_br(Z_R14);
383 }
384 break;
385
386 case StubId::c1_counter_overflow_id:
387 {
388 // Arguments :
389 // bci : stack param 0
390 // method : stack param 1
391 //
392 Register bci = Z_ARG2, method = Z_ARG3;
393 // frame size in bytes
394 OopMap* map = save_live_registers(sasm);
395 const int frame_size = sasm->frame_size() * VMRegImpl::slots_per_word * VMRegImpl::stack_slot_size;
396 __ z_lg(bci, 0*BytesPerWord + FrameMap::first_available_sp_in_frame + frame_size, Z_SP);
397 __ z_lg(method, 1*BytesPerWord + FrameMap::first_available_sp_in_frame + frame_size, Z_SP);
398 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, counter_overflow), bci, method);
399 oop_maps = new OopMapSet();
400 oop_maps->add_gc_map(call_offset, map);
401 restore_live_registers(sasm);
402 __ z_br(Z_R14);
403 }
404 break;
405 case StubId::c1_new_type_array_id:
406 case StubId::c1_new_object_array_id:
407 {
408 Register length = Z_R13; // Incoming
409 Register klass = Z_R11; // Incoming
410 Register obj = Z_R2; // Result
411
412 if (id == StubId::c1_new_type_array_id) {
413 __ set_info("new_type_array", dont_gc_arguments);
414 } else {
415 __ set_info("new_object_array", dont_gc_arguments);
416 }
417
418 #ifdef ASSERT
419 // Assert object type is really an array of the proper kind.
420 {
421 NearLabel ok;
422 Register t0 = obj;
423 __ mem2reg_opt(t0, Address(klass, Klass::layout_helper_offset()), false);
424 __ z_sra(t0, Klass::_lh_array_tag_shift);
425 int tag = ((id == StubId::c1_new_type_array_id)
426 ? Klass::_lh_array_tag_type_value : Klass::_lh_array_tag_ref_value);
427 __ compare32_and_branch(t0, tag, Assembler::bcondEqual, ok);
428 __ stop("assert(is an array klass)");
429 __ should_not_reach_here();
430 __ bind(ok);
431 }
432 #endif // ASSERT
433
434 OopMap* map = save_live_registers_except_r2(sasm);
435 int call_offset;
436 if (id == StubId::c1_new_type_array_id) {
437 call_offset = __ call_RT(obj, noreg, CAST_FROM_FN_PTR(address, new_type_array), klass, length);
438 } else {
439 call_offset = __ call_RT(obj, noreg, CAST_FROM_FN_PTR(address, new_object_array), klass, length);
440 }
441
442 oop_maps = new OopMapSet();
443 oop_maps->add_gc_map(call_offset, map);
444 restore_live_registers_except_r2(sasm);
445
446 __ verify_oop(obj, FILE_AND_LINE);
447 __ z_br(Z_R14);
448 }
449 break;
450
451 case StubId::c1_new_multi_array_id:
452 { __ set_info("new_multi_array", dont_gc_arguments);
453 // Z_R3,: klass
454 // Z_R4,: rank
455 // Z_R5: address of 1st dimension
456 OopMap* map = save_live_registers(sasm);
457 int call_offset = __ call_RT(Z_R2, noreg, CAST_FROM_FN_PTR(address, new_multi_array), Z_R3, Z_R4, Z_R5);
458
459 oop_maps = new OopMapSet();
460 oop_maps->add_gc_map(call_offset, map);
461 restore_live_registers_except_r2(sasm);
462
463 // Z_R2,: new multi array
464 __ verify_oop(Z_R2, FILE_AND_LINE);
465 __ z_br(Z_R14);
466 }
467 break;
468
469 case StubId::c1_register_finalizer_id:
470 {
471 __ set_info("register_finalizer", dont_gc_arguments);
472
473 // Load the klass and check the has finalizer flag.
474 Register klass = Z_ARG2;
475 __ load_klass(klass, Z_ARG1);
476 __ z_tm(Address(klass, Klass::misc_flags_offset()), KlassFlags::_misc_has_finalizer);
477 __ z_bcr(Assembler::bcondAllZero, Z_R14); // Return if bit is not set.
478
479 OopMap* oop_map = save_live_registers(sasm);
480 int call_offset = __ call_RT(noreg, noreg,
481 CAST_FROM_FN_PTR(address, SharedRuntime::register_finalizer), Z_ARG1);
482 oop_maps = new OopMapSet();
483 oop_maps->add_gc_map(call_offset, oop_map);
484
485 // Now restore all the live registers.
486 restore_live_registers(sasm);
487
488 __ z_br(Z_R14);
489 }
490 break;
491
492 case StubId::c1_throw_range_check_failed_id:
493 { __ set_info("range_check_failed", dont_gc_arguments);
494 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_range_check_exception), true);
495 }
496 break;
497
498 case StubId::c1_throw_index_exception_id:
499 { __ set_info("index_range_check_failed", dont_gc_arguments);
500 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_index_exception), true);
501 }
502 break;
503 case StubId::c1_throw_div0_exception_id:
504 { __ set_info("throw_div0_exception", dont_gc_arguments);
505 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_div0_exception), false);
506 }
507 break;
508 case StubId::c1_throw_null_pointer_exception_id:
509 { __ set_info("throw_null_pointer_exception", dont_gc_arguments);
510 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_null_pointer_exception), false);
511 }
512 break;
513 case StubId::c1_handle_exception_nofpu_id:
514 case StubId::c1_handle_exception_id:
515 { __ set_info("handle_exception", dont_gc_arguments);
516 oop_maps = generate_handle_exception(id, sasm);
517 }
518 break;
519 case StubId::c1_handle_exception_from_callee_id:
520 { __ set_info("handle_exception_from_callee", dont_gc_arguments);
521 oop_maps = generate_handle_exception(id, sasm);
522 }
523 break;
524 case StubId::c1_unwind_exception_id:
525 { __ set_info("unwind_exception", dont_gc_arguments);
526 // Note: no stubframe since we are about to leave the current
527 // activation and we are calling a leaf VM function only.
528 generate_unwind_exception(sasm);
529 }
530 break;
531 case StubId::c1_throw_array_store_exception_id:
532 { __ set_info("throw_array_store_exception", dont_gc_arguments);
533 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_array_store_exception), true);
534 }
535 break;
536 case StubId::c1_throw_class_cast_exception_id:
537 { // Z_R1_scratch: object
538 __ set_info("throw_class_cast_exception", dont_gc_arguments);
539 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_class_cast_exception), true);
540 }
541 break;
542 case StubId::c1_throw_incompatible_class_change_error_id:
543 { __ set_info("throw_incompatible_class_cast_exception", dont_gc_arguments);
544 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_incompatible_class_change_error), false);
545 }
546 break;
547 case StubId::c1_slow_subtype_check_id:
548 {
549 // Arguments :
550 // sub : stack param 0
551 // super: stack param 1
552 // raddr: Z_R14, blown by call
553 //
554 // Result : condition code 0 for match (bcondEqual will be true),
555 // condition code 2 for miss (bcondNotEqual will be true)
556 NearLabel miss;
557 const Register Rsubklass = Z_ARG2; // sub
558 const Register Rsuperklass = Z_ARG3; // super
559
560 // No args, but tmp registers that are killed.
561 const Register Rlength = Z_ARG4; // cache array length
562 const Register Rarray_ptr = Z_ARG5; // Current value from cache array.
563
564 if (UseCompressedOops) {
565 assert(Universe::heap() != nullptr, "java heap must be initialized to generate partial_subtype_check stub");
566 }
567
568 const int frame_size = 4*BytesPerWord + frame::z_abi_160_size;
569 // Save return pc. This is not necessary, but could be helpful
570 // in the case of crashes.
571 __ save_return_pc();
572 __ push_frame(frame_size);
573 // Save registers before changing them.
574 int i = 0;
575 __ z_stg(Rsubklass, (i++)*BytesPerWord + frame::z_abi_160_size, Z_SP);
576 __ z_stg(Rsuperklass, (i++)*BytesPerWord + frame::z_abi_160_size, Z_SP);
577 __ z_stg(Rlength, (i++)*BytesPerWord + frame::z_abi_160_size, Z_SP);
578 __ z_stg(Rarray_ptr, (i++)*BytesPerWord + frame::z_abi_160_size, Z_SP);
579 assert(i*BytesPerWord + frame::z_abi_160_size == frame_size, "check");
580
581 // Get sub and super from stack.
582 __ z_lg(Rsubklass, 0*BytesPerWord + FrameMap::first_available_sp_in_frame + frame_size, Z_SP);
583 __ z_lg(Rsuperklass, 1*BytesPerWord + FrameMap::first_available_sp_in_frame + frame_size, Z_SP);
584
585 __ check_klass_subtype_slow_path(Rsubklass,
586 Rsuperklass,
587 Rarray_ptr /* temp_reg */,
588 Rlength /* temp2_reg */,
589 nullptr /* L_success */,
590 &miss /* L_failure */);
591
592 // Match falls through here.
593 i = 0;
594 __ z_lg(Rsubklass, (i++)*BytesPerWord + frame::z_abi_160_size, Z_SP);
595 __ z_lg(Rsuperklass, (i++)*BytesPerWord + frame::z_abi_160_size, Z_SP);
596 __ z_lg(Rlength, (i++)*BytesPerWord + frame::z_abi_160_size, Z_SP);
597 __ z_lg(Rarray_ptr, (i++)*BytesPerWord + frame::z_abi_160_size, Z_SP);
598 assert(i*BytesPerWord + frame::z_abi_160_size == frame_size, "check");
599 __ pop_frame();
600 // Return pc is still in R_14.
601 __ clear_reg(Z_R0_scratch); // Zero indicates a match. Set CC 0 (bcondEqual will be true)
602 __ z_br(Z_R14);
603
604 __ BIND(miss);
605 i = 0;
606 __ z_lg(Rsubklass, (i++)*BytesPerWord + frame::z_abi_160_size, Z_SP);
607 __ z_lg(Rsuperklass, (i++)*BytesPerWord + frame::z_abi_160_size, Z_SP);
608 __ z_lg(Rlength, (i++)*BytesPerWord + frame::z_abi_160_size, Z_SP);
609 __ z_lg(Rarray_ptr, (i++)*BytesPerWord + frame::z_abi_160_size, Z_SP);
610 assert(i*BytesPerWord + frame::z_abi_160_size == frame_size, "check");
611 __ pop_frame();
612 // return pc is still in R_14
613 __ load_const_optimized(Z_R0_scratch, 1); // One indicates a miss.
614 __ z_ltgr(Z_R0_scratch, Z_R0_scratch); // Set CC 2 (bcondNotEqual will be true).
615 __ z_br(Z_R14);
616 }
617 break;
618 case StubId::c1_is_instance_of_id:
619 {
620 // Mirror: Z_ARG1(R2)
621 // Object: Z_ARG2
622 // Temps: Z_ARG3, Z_ARG4, Z_ARG5, Z_R10, Z_R11
623 // Result: Z_RET(R2)
624
625 // Get the Klass* into Z_ARG3
626 Register klass = Z_ARG3 , obj = Z_ARG2, result = Z_RET;
627 Register temp0 = Z_ARG4, temp1 = Z_ARG5, temp2 = Z_R10, temp3 = Z_R11;
628
629 __ z_ltg(klass, Address(Z_ARG1, java_lang_Class::klass_offset())); // Klass is null
630
631 Label is_secondary;
632
633 __ clear_reg(result /* Z_R2 */, true /* whole_reg */, false /* set_cc */); // sets result=0 (failure)
634
635 __ z_bcr(Assembler::bcondEqual, Z_R14); // cc set by z_ltg above
636
637 __ z_ltgr(obj, obj); // obj is null
638 __ z_bcr(Assembler::bcondEqual, Z_R14);
639
640 __ z_llgf(temp0, Address(klass, in_bytes(Klass::super_check_offset_offset())));
641 __ compare32_and_branch(temp0, in_bytes(Klass::secondary_super_cache_offset()), Assembler::bcondEqual, is_secondary); // Klass is a secondary superclass
642
643 // Klass is a concrete class
644 __ load_klass(temp1, obj);
645 __ z_cg(klass, Address(temp1, temp0));
646
647 // result is already holding 0, denoting NotEqual case
648 __ load_on_condition_imm_32(result, 1, Assembler::bcondEqual);
649 __ z_br(Z_R14);
650
651 __ bind(is_secondary);
652
653 __ load_klass(obj, obj);
654
655 // This is necessary because I am never in my own secondary_super list.
656 __ z_cgr(obj, klass);
657 __ load_on_condition_imm_32(result, 1, Assembler::bcondEqual);
658 __ z_bcr(Assembler::bcondEqual, Z_R14);
659
660 // Z_R10 and Z_R11 are callee saved, so we must need to preserve them before any use
661 __ z_ldgr(Z_F1, Z_R10);
662 __ z_ldgr(Z_F3, Z_R11);
663
664 __ lookup_secondary_supers_table_var(obj, klass,
665 /*temps*/ temp0, temp1, temp2, temp3,
666 result);
667
668 // lookup_secondary_supers_table_var return 0 on success and 1 on failure.
669 // but this method returns 0 on failure and 1 on success.
670 // so we have to invert the result from lookup_secondary_supers_table_var.
671 __ z_xilf(result, 1); // invert the result
672
673 __ z_lgdr(Z_R10, Z_F1);
674 __ z_lgdr(Z_R11, Z_F3);
675
676 __ z_br(Z_R14);
677
678 }
679 case StubId::c1_monitorenter_nofpu_id:
680 case StubId::c1_monitorenter_id:
681 { // Z_R1_scratch : object
682 // Z_R13 : lock address (see LIRGenerator::syncTempOpr())
683 __ set_info("monitorenter", dont_gc_arguments);
684
685 int save_fpu_registers = (id == StubId::c1_monitorenter_id);
686 // Make a frame and preserve the caller's caller-save registers.
687 OopMap* oop_map = save_live_registers(sasm, save_fpu_registers);
688
689 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, monitorenter), Z_R1_scratch, Z_R13);
690
691 oop_maps = new OopMapSet();
692 oop_maps->add_gc_map(call_offset, oop_map);
693 restore_live_registers(sasm, save_fpu_registers);
694
695 __ z_br(Z_R14);
696 }
697 break;
698
699 case StubId::c1_monitorexit_nofpu_id:
700 case StubId::c1_monitorexit_id:
701 { // Z_R1_scratch : lock address
702 // Note: really a leaf routine but must setup last java sp
703 // => Use call_RT for now (speed can be improved by
704 // doing last java sp setup manually).
705 __ set_info("monitorexit", dont_gc_arguments);
706
707 int save_fpu_registers = (id == StubId::c1_monitorexit_id);
708 // Make a frame and preserve the caller's caller-save registers.
709 OopMap* oop_map = save_live_registers(sasm, save_fpu_registers);
710
711 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, monitorexit), Z_R1_scratch);
712
713 oop_maps = new OopMapSet();
714 oop_maps->add_gc_map(call_offset, oop_map);
715 restore_live_registers(sasm, save_fpu_registers);
716
717 __ z_br(Z_R14);
718 }
719 break;
720
721 case StubId::c1_deoptimize_id:
722 { // Args: Z_R1_scratch: trap request
723 __ set_info("deoptimize", dont_gc_arguments);
724 Register trap_request = Z_R1_scratch;
725 OopMap* oop_map = save_live_registers(sasm);
726 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, deoptimize), trap_request);
727 oop_maps = new OopMapSet();
728 oop_maps->add_gc_map(call_offset, oop_map);
729 restore_live_registers(sasm);
730 DeoptimizationBlob* deopt_blob = SharedRuntime::deopt_blob();
731 assert(deopt_blob != nullptr, "deoptimization blob must have been created");
732 AddressLiteral dest(deopt_blob->unpack_with_reexecution());
733 __ load_const_optimized(Z_R1_scratch, dest);
734 __ z_br(Z_R1_scratch);
735 }
736 break;
737
738 case StubId::c1_access_field_patching_id:
739 { __ set_info("access_field_patching", dont_gc_arguments);
740 oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, access_field_patching));
741 }
742 break;
743
744 case StubId::c1_load_klass_patching_id:
745 { __ set_info("load_klass_patching", dont_gc_arguments);
746 // We should set up register map.
747 oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, move_klass_patching));
748 }
749 break;
750
751 case StubId::c1_load_mirror_patching_id:
752 { __ set_info("load_mirror_patching", dont_gc_arguments);
753 oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, move_mirror_patching));
754 }
755 break;
756
757 case StubId::c1_load_appendix_patching_id:
758 { __ set_info("load_appendix_patching", dont_gc_arguments);
759 oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, move_appendix_patching));
760 }
761 break;
762 #if 0
763 case StubId::c1_dtrace_object_alloc_id:
764 { // rax,: object
765 StubFrame f(sasm, "dtrace_object_alloc", dont_gc_arguments);
766 // We can't gc here so skip the oopmap but make sure that all
767 // the live registers get saved.
768 save_live_registers(sasm, 1);
769
770 __ NOT_LP64(push(rax)) LP64_ONLY(mov(c_rarg0, rax));
771 __ call(RuntimeAddress(CAST_FROM_FN_PTR(address, static_cast<int (*)(oopDesc*)>(SharedRuntime::dtrace_object_alloc))));
772 NOT_LP64(__ pop(rax));
773
774 restore_live_registers(sasm);
775 }
776 break;
777
778 case StubId::c1_fpu2long_stub_id:
779 {
780 // rax, and rdx are destroyed, but should be free since the result is returned there
781 // preserve rsi,ecx
782 __ push(rsi);
783 __ push(rcx);
784 LP64_ONLY(__ push(rdx);)
785
786 // check for NaN
787 Label return0, do_return, return_min_jlong, do_convert;
788
789 Address value_high_word(rsp, wordSize + 4);
790 Address value_low_word(rsp, wordSize);
791 Address result_high_word(rsp, 3*wordSize + 4);
792 Address result_low_word(rsp, 3*wordSize);
793
794 __ subptr(rsp, 32); // more than enough on 32bit
795 __ fst_d(value_low_word);
796 __ movl(rax, value_high_word);
797 __ andl(rax, 0x7ff00000);
798 __ cmpl(rax, 0x7ff00000);
799 __ jcc(Assembler::notEqual, do_convert);
800 __ movl(rax, value_high_word);
801 __ andl(rax, 0xfffff);
802 __ orl(rax, value_low_word);
803 __ jcc(Assembler::notZero, return0);
804
805 __ bind(do_convert);
806 __ fnstcw(Address(rsp, 0));
807 __ movzwl(rax, Address(rsp, 0));
808 __ orl(rax, 0xc00);
809 __ movw(Address(rsp, 2), rax);
810 __ fldcw(Address(rsp, 2));
811 __ fwait();
812 __ fistp_d(result_low_word);
813 __ fldcw(Address(rsp, 0));
814 __ fwait();
815 // This gets the entire long in rax on 64bit
816 __ movptr(rax, result_low_word);
817 // testing of high bits
818 __ movl(rdx, result_high_word);
819 __ mov(rcx, rax);
820 // What the heck is the point of the next instruction???
821 __ xorl(rcx, 0x0);
822 __ movl(rsi, 0x80000000);
823 __ xorl(rsi, rdx);
824 __ orl(rcx, rsi);
825 __ jcc(Assembler::notEqual, do_return);
826 __ fldz();
827 __ fcomp_d(value_low_word);
828 __ fnstsw_ax();
829 __ testl(rax, 0x4100); // ZF & CF == 0
830 __ jcc(Assembler::equal, return_min_jlong);
831 // return max_jlong
832 __ mov64(rax, CONST64(0x7fffffffffffffff));
833 __ jmp(do_return);
834
835 __ bind(return_min_jlong);
836 __ mov64(rax, UCONST64(0x8000000000000000));
837 __ jmp(do_return);
838
839 __ bind(return0);
840 __ fpop();
841 __ xorptr(rax, rax);
842
843 __ bind(do_return);
844 __ addptr(rsp, 32);
845 LP64_ONLY(__ pop(rdx);)
846 __ pop(rcx);
847 __ pop(rsi);
848 __ ret(0);
849 }
850 break;
851 #endif // TODO
852
853 case StubId::c1_predicate_failed_trap_id:
854 {
855 __ set_info("predicate_failed_trap", dont_gc_arguments);
856
857 OopMap* map = save_live_registers(sasm);
858
859 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, predicate_failed_trap));
860 oop_maps = new OopMapSet();
861 oop_maps->add_gc_map(call_offset, map);
862 restore_live_registers(sasm);
863
864 DeoptimizationBlob* deopt_blob = SharedRuntime::deopt_blob();
865 assert(deopt_blob != nullptr, "deoptimization blob must have been created");
866
867 __ load_const_optimized(Z_R1_scratch, deopt_blob->unpack_with_reexecution());
868 __ z_br(Z_R1_scratch);
869 }
870 break;
871
872 default:
873 {
874 __ should_not_reach_here(FILE_AND_LINE, (int)id);
875 }
876 break;
877 }
878 return oop_maps;
879 }
880
881 OopMapSet* Runtime1::generate_handle_exception(StubId id, StubAssembler *sasm) {
882 __ block_comment("generate_handle_exception");
883
884 // incoming parameters: Z_EXC_OOP, Z_EXC_PC
885
886 // Save registers if required.
887 OopMapSet* oop_maps = new OopMapSet();
888 OopMap* oop_map = nullptr;
889 Register reg_fp = Z_R1_scratch;
890
891 switch (id) {
892 case StubId::c1_forward_exception_id: {
893 // We're handling an exception in the context of a compiled frame.
894 // The registers have been saved in the standard places. Perform
895 // an exception lookup in the caller and dispatch to the handler
896 // if found. Otherwise unwind and dispatch to the callers
897 // exception handler.
898 oop_map = generate_oop_map(sasm);
899
900 // Load and clear pending exception oop into.
901 __ z_lg(Z_EXC_OOP, Address(Z_thread, Thread::pending_exception_offset()));
902 __ clear_mem(Address(Z_thread, Thread::pending_exception_offset()), 8);
903
904 // Different stubs forward their exceptions; they should all have similar frame layouts
905 // (a) to find their return address (b) for a correct oop_map generated above.
906 assert(RegisterSaver::live_reg_frame_size(RegisterSaver::all_registers) ==
907 RegisterSaver::live_reg_frame_size(RegisterSaver::all_registers_except_r2), "requirement");
908
909 // Load issuing PC (the return address for this stub).
910 const int frame_size_in_bytes = sasm->frame_size() * VMRegImpl::slots_per_word * VMRegImpl::stack_slot_size;
911 __ z_lg(Z_EXC_PC, Address(Z_SP, frame_size_in_bytes + _z_common_abi(return_pc)));
912 DEBUG_ONLY(__ z_lay(reg_fp, Address(Z_SP, frame_size_in_bytes));)
913
914 // Make sure that the vm_results are cleared (may be unnecessary).
915 __ clear_mem(Address(Z_thread, JavaThread::vm_result_oop_offset()), sizeof(oop));
916 __ clear_mem(Address(Z_thread, JavaThread::vm_result_metadata_offset()), sizeof(Metadata*));
917 break;
918 }
919 case StubId::c1_handle_exception_nofpu_id:
920 case StubId::c1_handle_exception_id:
921 // At this point all registers MAY be live.
922 DEBUG_ONLY(__ z_lgr(reg_fp, Z_SP);)
923 oop_map = save_live_registers(sasm, id != StubId::c1_handle_exception_nofpu_id, Z_EXC_PC);
924 break;
925 case StubId::c1_handle_exception_from_callee_id: {
926 // At this point all registers except Z_EXC_OOP and Z_EXC_PC are dead.
927 DEBUG_ONLY(__ z_lgr(reg_fp, Z_SP);)
928 __ save_return_pc(Z_EXC_PC);
929 const int frame_size_in_bytes = __ push_frame_abi160(0);
930 oop_map = new OopMap(frame_size_in_bytes / VMRegImpl::stack_slot_size, 0);
931 sasm->set_frame_size(frame_size_in_bytes / BytesPerWord);
932 break;
933 }
934 default: ShouldNotReachHere();
935 }
936
937 // Verify that only Z_EXC_OOP, and Z_EXC_PC are valid at this time.
938 __ invalidate_registers(Z_EXC_OOP, Z_EXC_PC, reg_fp);
939 // Verify that Z_EXC_OOP, contains a valid exception.
940 __ verify_not_null_oop(Z_EXC_OOP);
941
942 // Check that fields in JavaThread for exception oop and issuing pc
943 // are empty before writing to them.
944 __ asm_assert_mem8_is_zero(in_bytes(JavaThread::exception_oop_offset()), Z_thread, "exception oop already set : " FILE_AND_LINE, 0);
945 __ asm_assert_mem8_is_zero(in_bytes(JavaThread::exception_pc_offset()), Z_thread, "exception pc already set : " FILE_AND_LINE, 0);
946
947 // Save exception oop and issuing pc into JavaThread.
948 // (Exception handler will load it from here.)
949 __ z_stg(Z_EXC_OOP, Address(Z_thread, JavaThread::exception_oop_offset()));
950 __ z_stg(Z_EXC_PC, Address(Z_thread, JavaThread::exception_pc_offset()));
951
952 #ifdef ASSERT
953 { NearLabel ok;
954 __ z_cg(Z_EXC_PC, Address(reg_fp, _z_common_abi(return_pc)));
955 __ branch_optimized(Assembler::bcondEqual, ok);
956 __ stop("use throwing pc as return address (has bci & oop map)");
957 __ bind(ok);
958 }
959 #endif
960
961 // Compute the exception handler.
962 // The exception oop and the throwing pc are read from the fields in JavaThread.
963 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, exception_handler_for_pc));
964 oop_maps->add_gc_map(call_offset, oop_map);
965
966 // Z_RET(Z_R2): handler address
967 // will be the deopt blob if nmethod was deoptimized while we looked up
968 // handler regardless of whether handler existed in the nmethod.
969
970 // Only Z_R2, is valid at this time, all other registers have been destroyed by the runtime call.
971 __ invalidate_registers(Z_R2);
972
973 switch(id) {
974 case StubId::c1_forward_exception_id:
975 case StubId::c1_handle_exception_nofpu_id:
976 case StubId::c1_handle_exception_id:
977 // Restore the registers that were saved at the beginning.
978 __ z_lgr(Z_R1_scratch, Z_R2); // Restoring live registers kills Z_R2.
979 restore_live_registers(sasm, id != StubId::c1_handle_exception_nofpu_id); // Pops as well the frame.
980 __ z_br(Z_R1_scratch);
981 break;
982 case StubId::c1_handle_exception_from_callee_id: {
983 __ pop_frame();
984 __ z_br(Z_R2); // Jump to exception handler.
985 }
986 break;
987 default: ShouldNotReachHere();
988 }
989
990 return oop_maps;
991 }
992
993
994 #undef __
995
996 const char *Runtime1::pd_name_for_address(address entry) {
997 return "<unknown function>";
998 }