1 /*
2 * Copyright (c) 2016, 2023, 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 "precompiled.hpp"
27 #include "asm/macroAssembler.inline.hpp"
28 #include "c1/c1_Defs.hpp"
29 #include "c1/c1_MacroAssembler.hpp"
30 #include "c1/c1_Runtime1.hpp"
31 #include "ci/ciUtilities.hpp"
32 #include "compiler/oopMap.hpp"
33 #include "gc/shared/cardTable.hpp"
34 #include "gc/shared/cardTableBarrierSet.hpp"
35 #include "interpreter/interpreter.hpp"
36 #include "memory/universe.hpp"
37 #include "nativeInst_s390.hpp"
38 #include "oops/oop.inline.hpp"
39 #include "prims/jvmtiExport.hpp"
40 #include "register_s390.hpp"
41 #include "registerSaver_s390.hpp"
42 #include "runtime/sharedRuntime.hpp"
43 #include "runtime/signature.hpp"
44 #include "runtime/stubRoutines.hpp"
45 #include "runtime/vframeArray.hpp"
46 #include "utilities/macros.hpp"
47 #include "utilities/powerOfTwo.hpp"
48 #include "vmreg_s390.inline.hpp"
49
50 // Implementation of StubAssembler
51
52 int StubAssembler::call_RT(Register oop_result1, Register metadata_result, address entry_point, int number_of_arguments) {
53 set_num_rt_args(0); // Nothing on stack.
54 assert(!(oop_result1->is_valid() || metadata_result->is_valid()) || oop_result1 != metadata_result, "registers must be different");
55
56 // We cannot trust that code generated by the C++ compiler saves R14
57 // to z_abi_160.return_pc, because sometimes it spills R14 using stmg at
58 // z_abi_160.gpr14 (e.g. InterpreterRuntime::_new()).
59 // Therefore we load the PC into Z_R1_scratch and let set_last_Java_frame() save
60 // it into the frame anchor.
61 address pc = get_PC(Z_R1_scratch);
62 int call_offset = (int)(pc - addr_at(0));
63 set_last_Java_frame(Z_SP, Z_R1_scratch);
64
65 // ARG1 must hold thread address.
66 z_lgr(Z_ARG1, Z_thread);
67
68 address return_pc = nullptr;
69 align_call_far_patchable(this->pc());
70 return_pc = call_c_opt(entry_point);
71 assert(return_pc != nullptr, "const section overflow");
72
73 reset_last_Java_frame();
74
75 // Check for pending exceptions.
76 {
77 load_and_test_long(Z_R0_scratch, Address(Z_thread, Thread::pending_exception_offset()));
78
79 // This used to conditionally jump to forward_exception however it is
80 // possible if we relocate that the branch will not reach. So we must jump
81 // around so we can always reach.
82
83 Label ok;
84 z_bre(ok); // Bcondequal is the same as bcondZero.
85
86 // exception pending => forward to exception handler
87
88 // Make sure that the vm_results are cleared.
89 if (oop_result1->is_valid()) {
90 clear_mem(Address(Z_thread, JavaThread::vm_result_offset()), sizeof(jlong));
91 }
92 if (metadata_result->is_valid()) {
93 clear_mem(Address(Z_thread, JavaThread::vm_result_2_offset()), sizeof(jlong));
94 }
95 if (frame_size() == no_frame_size) {
96 // Pop the stub frame.
97 pop_frame();
98 restore_return_pc();
99 load_const_optimized(Z_R1, StubRoutines::forward_exception_entry());
100 z_br(Z_R1);
101 } else if (_stub_id == Runtime1::forward_exception_id) {
102 should_not_reach_here();
103 } else {
104 load_const_optimized(Z_R1, Runtime1::entry_for (Runtime1::forward_exception_id));
105 z_br(Z_R1);
106 }
107
108 bind(ok);
109 }
110
111 // Get oop results if there are any and reset the values in the thread.
112 if (oop_result1->is_valid()) {
113 get_vm_result(oop_result1);
114 }
115 if (metadata_result->is_valid()) {
116 get_vm_result_2(metadata_result);
117 }
118
119 return call_offset;
120 }
121
122
123 int StubAssembler::call_RT(Register oop_result1, Register metadata_result, address entry, Register arg1) {
124 // Z_ARG1 is reserved for the thread.
125 lgr_if_needed(Z_ARG2, arg1);
126 return call_RT(oop_result1, metadata_result, entry, 1);
127 }
128
129
130 int StubAssembler::call_RT(Register oop_result1, Register metadata_result, address entry, Register arg1, Register arg2) {
131 // Z_ARG1 is reserved for the thread.
132 lgr_if_needed(Z_ARG2, arg1);
133 assert(arg2 != Z_ARG2, "smashed argument");
134 lgr_if_needed(Z_ARG3, arg2);
135 return call_RT(oop_result1, metadata_result, entry, 2);
136 }
137
138
139 int StubAssembler::call_RT(Register oop_result1, Register metadata_result, address entry, Register arg1, Register arg2, Register arg3) {
140 // Z_ARG1 is reserved for the thread.
141 lgr_if_needed(Z_ARG2, arg1);
142 assert(arg2 != Z_ARG2, "smashed argument");
143 lgr_if_needed(Z_ARG3, arg2);
144 assert(arg3 != Z_ARG3, "smashed argument");
145 lgr_if_needed(Z_ARG4, arg3);
146 return call_RT(oop_result1, metadata_result, entry, 3);
147 }
148
149
150 // Implementation of Runtime1
151
152 #define __ sasm->
153
154 #ifndef PRODUCT
155 #undef __
156 #define __ (Verbose ? (sasm->block_comment(FILE_AND_LINE),sasm):sasm)->
157 #endif // !PRODUCT
158
159 #define BLOCK_COMMENT(str) if (PrintAssembly) __ block_comment(str)
160 #define BIND(label) bind(label); BLOCK_COMMENT(#label ":")
161
162 static OopMap* generate_oop_map(StubAssembler* sasm) {
163 RegisterSaver::RegisterSet reg_set = RegisterSaver::all_registers;
164 int frame_size_in_slots =
165 RegisterSaver::live_reg_frame_size(reg_set) / VMRegImpl::stack_slot_size;
166 sasm->set_frame_size(frame_size_in_slots / VMRegImpl::slots_per_word);
167 return RegisterSaver::generate_oop_map(sasm, reg_set);
168 }
169
170 static OopMap* save_live_registers(StubAssembler* sasm, bool save_fpu_registers = true, Register return_pc = Z_R14) {
171 __ block_comment("save_live_registers");
172 RegisterSaver::RegisterSet reg_set =
173 save_fpu_registers ? RegisterSaver::all_registers : RegisterSaver::all_integer_registers;
174 int frame_size_in_slots =
175 RegisterSaver::live_reg_frame_size(reg_set) / VMRegImpl::stack_slot_size;
176 sasm->set_frame_size(frame_size_in_slots / VMRegImpl::slots_per_word);
177 return RegisterSaver::save_live_registers(sasm, reg_set, return_pc);
178 }
179
180 static OopMap* save_live_registers_except_r2(StubAssembler* sasm, bool save_fpu_registers = true) {
181 if (!save_fpu_registers) {
182 __ unimplemented(FILE_AND_LINE);
183 }
184 __ block_comment("save_live_registers");
185 RegisterSaver::RegisterSet reg_set = RegisterSaver::all_registers_except_r2;
186 int frame_size_in_slots =
187 RegisterSaver::live_reg_frame_size(reg_set) / VMRegImpl::stack_slot_size;
188 sasm->set_frame_size(frame_size_in_slots / VMRegImpl::slots_per_word);
189 return RegisterSaver::save_live_registers(sasm, reg_set);
190 }
191
192 static void restore_live_registers(StubAssembler* sasm, bool restore_fpu_registers = true) {
193 __ block_comment("restore_live_registers");
194 RegisterSaver::RegisterSet reg_set =
195 restore_fpu_registers ? RegisterSaver::all_registers : RegisterSaver::all_integer_registers;
196 RegisterSaver::restore_live_registers(sasm, reg_set);
197 }
198
199 static void restore_live_registers_except_r2(StubAssembler* sasm, bool restore_fpu_registers = true) {
200 if (!restore_fpu_registers) {
201 __ unimplemented(FILE_AND_LINE);
202 }
203 __ block_comment("restore_live_registers_except_r2");
204 RegisterSaver::restore_live_registers(sasm, RegisterSaver::all_registers_except_r2);
205 }
206
207 void Runtime1::initialize_pd() {
208 // Nothing to do.
209 }
210
211 OopMapSet* Runtime1::generate_exception_throw(StubAssembler* sasm, address target, bool has_argument) {
212 // Make a frame and preserve the caller's caller-save registers.
213 OopMap* oop_map = save_live_registers(sasm);
214 int call_offset;
215 if (!has_argument) {
216 call_offset = __ call_RT(noreg, noreg, target);
217 } else {
218 call_offset = __ call_RT(noreg, noreg, target, Z_R1_scratch, Z_R0_scratch);
219 }
220 OopMapSet* oop_maps = new OopMapSet();
221 oop_maps->add_gc_map(call_offset, oop_map);
222
223 __ should_not_reach_here();
224 return oop_maps;
225 }
226
227 void Runtime1::generate_unwind_exception(StubAssembler *sasm) {
228 // Incoming parameters: Z_EXC_OOP and Z_EXC_PC.
229 // Keep copies in callee-saved registers during runtime call.
230 const Register exception_oop_callee_saved = Z_R11;
231 const Register exception_pc_callee_saved = Z_R12;
232 // Other registers used in this stub.
233 const Register handler_addr = Z_R4;
234
235 if (AbortVMOnException) {
236 save_live_registers(sasm);
237 __ call_VM_leaf(CAST_FROM_FN_PTR(address, check_abort_on_vm_exception), Z_EXC_OOP);
238 restore_live_registers(sasm);
239 }
240
241 // Verify that only exception_oop, is valid at this time.
242 __ invalidate_registers(Z_EXC_OOP, Z_EXC_PC);
243
244 // Check that fields in JavaThread for exception oop and issuing pc are set.
245 __ asm_assert_mem8_is_zero(in_bytes(JavaThread::exception_oop_offset()), Z_thread, "exception oop already set : " FILE_AND_LINE, 0);
246 __ asm_assert_mem8_is_zero(in_bytes(JavaThread::exception_pc_offset()), Z_thread, "exception pc already set : " FILE_AND_LINE, 0);
247
248 // Save exception_oop and pc in callee-saved register to preserve it
249 // during runtime calls.
250 __ verify_not_null_oop(Z_EXC_OOP);
251 __ lgr_if_needed(exception_oop_callee_saved, Z_EXC_OOP);
252 __ lgr_if_needed(exception_pc_callee_saved, Z_EXC_PC);
253
254 __ push_frame_abi160(0); // Runtime code needs the z_abi_160.
255
256 // Search the exception handler address of the caller (using the return address).
257 __ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::exception_handler_for_return_address), Z_thread, Z_EXC_PC);
258 // Z_RET(Z_R2): exception handler address of the caller.
259
260 __ pop_frame();
261
262 __ invalidate_registers(exception_oop_callee_saved, exception_pc_callee_saved, Z_RET);
263
264 // Move result of call into correct register.
265 __ lgr_if_needed(handler_addr, Z_RET);
266
267 // Restore exception oop and pc to Z_EXC_OOP and Z_EXC_PC (required convention of exception handler).
268 __ lgr_if_needed(Z_EXC_OOP, exception_oop_callee_saved);
269 __ lgr_if_needed(Z_EXC_PC, exception_pc_callee_saved);
270
271 // Verify that there is really a valid exception in Z_EXC_OOP.
272 __ verify_not_null_oop(Z_EXC_OOP);
273
274 __ z_br(handler_addr); // Jump to exception handler.
275 }
276
277 OopMapSet* Runtime1::generate_patching(StubAssembler* sasm, address target) {
278 // Make a frame and preserve the caller's caller-save registers.
279 OopMap* oop_map = save_live_registers(sasm);
280
281 // Call the runtime patching routine, returns non-zero if nmethod got deopted.
282 int call_offset = __ call_RT(noreg, noreg, target);
283 OopMapSet* oop_maps = new OopMapSet();
284 oop_maps->add_gc_map(call_offset, oop_map);
285
286 // Re-execute the patched instruction or, if the nmethod was
287 // deoptmized, return to the deoptimization handler entry that will
288 // cause re-execution of the current bytecode.
289 DeoptimizationBlob* deopt_blob = SharedRuntime::deopt_blob();
290 assert(deopt_blob != nullptr, "deoptimization blob must have been created");
291
292 __ z_ltr(Z_RET, Z_RET); // return value == 0
293
294 restore_live_registers(sasm);
295
296 __ z_bcr(Assembler::bcondZero, Z_R14);
297
298 // Return to the deoptimization handler entry for unpacking and
299 // rexecute if we simply returned then we'd deopt as if any call we
300 // patched had just returned.
301 AddressLiteral dest(deopt_blob->unpack_with_reexecution());
302 __ load_const_optimized(Z_R1_scratch, dest);
303 __ z_br(Z_R1_scratch);
304
305 return oop_maps;
306 }
307
308 OopMapSet* Runtime1::generate_code_for(StubID id, StubAssembler* sasm) {
309
310 // for better readability
311 const bool must_gc_arguments = true;
312 const bool dont_gc_arguments = false;
313
314 // Default value; overwritten for some optimized stubs that are
315 // called from methods that do not use the fpu.
316 bool save_fpu_registers = true;
317
318 // Stub code and info for the different stubs.
319 OopMapSet* oop_maps = nullptr;
320 switch (id) {
321 case forward_exception_id:
322 {
323 oop_maps = generate_handle_exception(id, sasm);
324 // will not return
325 }
326 break;
327
328 case new_instance_id:
329 case fast_new_instance_id:
330 case fast_new_instance_init_check_id:
331 {
332 Register klass = Z_R11; // Incoming
333 Register obj = Z_R2; // Result
334
335 if (id == new_instance_id) {
336 __ set_info("new_instance", dont_gc_arguments);
337 } else if (id == fast_new_instance_id) {
338 __ set_info("fast new_instance", dont_gc_arguments);
339 } else {
340 assert(id == fast_new_instance_init_check_id, "bad StubID");
341 __ set_info("fast new_instance init check", dont_gc_arguments);
342 }
343
344 OopMap* map = save_live_registers_except_r2(sasm);
345 int call_offset = __ call_RT(obj, noreg, CAST_FROM_FN_PTR(address, new_instance), klass);
346 oop_maps = new OopMapSet();
347 oop_maps->add_gc_map(call_offset, map);
348 restore_live_registers_except_r2(sasm);
349
350 __ verify_oop(obj, FILE_AND_LINE);
351 __ z_br(Z_R14);
352 }
353 break;
354
355 case counter_overflow_id:
356 {
357 // Arguments :
358 // bci : stack param 0
359 // method : stack param 1
360 //
361 Register bci = Z_ARG2, method = Z_ARG3;
362 // frame size in bytes
363 OopMap* map = save_live_registers(sasm);
364 const int frame_size = sasm->frame_size() * VMRegImpl::slots_per_word * VMRegImpl::stack_slot_size;
365 __ z_lg(bci, 0*BytesPerWord + FrameMap::first_available_sp_in_frame + frame_size, Z_SP);
366 __ z_lg(method, 1*BytesPerWord + FrameMap::first_available_sp_in_frame + frame_size, Z_SP);
367 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, counter_overflow), bci, method);
368 oop_maps = new OopMapSet();
369 oop_maps->add_gc_map(call_offset, map);
370 restore_live_registers(sasm);
371 __ z_br(Z_R14);
372 }
373 break;
374 case new_type_array_id:
375 case new_object_array_id:
376 {
377 Register length = Z_R13; // Incoming
378 Register klass = Z_R11; // Incoming
379 Register obj = Z_R2; // Result
380
381 if (id == new_type_array_id) {
382 __ set_info("new_type_array", dont_gc_arguments);
383 } else {
384 __ set_info("new_object_array", dont_gc_arguments);
385 }
386
387 #ifdef ASSERT
388 // Assert object type is really an array of the proper kind.
389 {
390 NearLabel ok;
391 Register t0 = obj;
392 __ mem2reg_opt(t0, Address(klass, Klass::layout_helper_offset()), false);
393 __ z_sra(t0, Klass::_lh_array_tag_shift);
394 int tag = ((id == new_type_array_id)
395 ? Klass::_lh_array_tag_type_value
396 : Klass::_lh_array_tag_obj_value);
397 __ compare32_and_branch(t0, tag, Assembler::bcondEqual, ok);
398 __ stop("assert(is an array klass)");
399 __ should_not_reach_here();
400 __ bind(ok);
401 }
402 #endif // ASSERT
403
404 OopMap* map = save_live_registers_except_r2(sasm);
405 int call_offset;
406 if (id == new_type_array_id) {
407 call_offset = __ call_RT(obj, noreg, CAST_FROM_FN_PTR(address, new_type_array), klass, length);
408 } else {
409 call_offset = __ call_RT(obj, noreg, CAST_FROM_FN_PTR(address, new_object_array), klass, length);
410 }
411
412 oop_maps = new OopMapSet();
413 oop_maps->add_gc_map(call_offset, map);
414 restore_live_registers_except_r2(sasm);
415
416 __ verify_oop(obj, FILE_AND_LINE);
417 __ z_br(Z_R14);
418 }
419 break;
420
421 case new_multi_array_id:
422 { __ set_info("new_multi_array", dont_gc_arguments);
423 // Z_R3,: klass
424 // Z_R4,: rank
425 // Z_R5: address of 1st dimension
426 OopMap* map = save_live_registers(sasm);
427 int call_offset = __ call_RT(Z_R2, noreg, CAST_FROM_FN_PTR(address, new_multi_array), Z_R3, Z_R4, Z_R5);
428
429 oop_maps = new OopMapSet();
430 oop_maps->add_gc_map(call_offset, map);
431 restore_live_registers_except_r2(sasm);
432
433 // Z_R2,: new multi array
434 __ verify_oop(Z_R2, FILE_AND_LINE);
435 __ z_br(Z_R14);
436 }
437 break;
438
439 case register_finalizer_id:
440 {
441 __ set_info("register_finalizer", dont_gc_arguments);
442
443 // Load the klass and check the has finalizer flag.
444 Register klass = Z_ARG2;
445 __ load_klass(klass, Z_ARG1);
446 __ testbit(Address(klass, Klass::access_flags_offset()), exact_log2(JVM_ACC_HAS_FINALIZER));
447 __ z_bcr(Assembler::bcondAllZero, Z_R14); // Return if bit is not set.
448
449 OopMap* oop_map = save_live_registers(sasm);
450 int call_offset = __ call_RT(noreg, noreg,
451 CAST_FROM_FN_PTR(address, SharedRuntime::register_finalizer), Z_ARG1);
452 oop_maps = new OopMapSet();
453 oop_maps->add_gc_map(call_offset, oop_map);
454
455 // Now restore all the live registers.
456 restore_live_registers(sasm);
457
458 __ z_br(Z_R14);
459 }
460 break;
461
462 case throw_range_check_failed_id:
463 { __ set_info("range_check_failed", dont_gc_arguments);
464 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_range_check_exception), true);
465 }
466 break;
467
468 case throw_index_exception_id:
469 { __ set_info("index_range_check_failed", dont_gc_arguments);
470 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_index_exception), true);
471 }
472 break;
473 case throw_div0_exception_id:
474 { __ set_info("throw_div0_exception", dont_gc_arguments);
475 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_div0_exception), false);
476 }
477 break;
478 case throw_null_pointer_exception_id:
479 { __ set_info("throw_null_pointer_exception", dont_gc_arguments);
480 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_null_pointer_exception), false);
481 }
482 break;
483 case handle_exception_nofpu_id:
484 case handle_exception_id:
485 { __ set_info("handle_exception", dont_gc_arguments);
486 oop_maps = generate_handle_exception(id, sasm);
487 }
488 break;
489 case handle_exception_from_callee_id:
490 { __ set_info("handle_exception_from_callee", dont_gc_arguments);
491 oop_maps = generate_handle_exception(id, sasm);
492 }
493 break;
494 case unwind_exception_id:
495 { __ set_info("unwind_exception", dont_gc_arguments);
496 // Note: no stubframe since we are about to leave the current
497 // activation and we are calling a leaf VM function only.
498 generate_unwind_exception(sasm);
499 }
500 break;
501 case throw_array_store_exception_id:
502 { __ set_info("throw_array_store_exception", dont_gc_arguments);
503 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_array_store_exception), true);
504 }
505 break;
506 case throw_class_cast_exception_id:
507 { // Z_R1_scratch: object
508 __ set_info("throw_class_cast_exception", dont_gc_arguments);
509 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_class_cast_exception), true);
510 }
511 break;
512 case throw_incompatible_class_change_error_id:
513 { __ set_info("throw_incompatible_class_cast_exception", dont_gc_arguments);
514 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_incompatible_class_change_error), false);
515 }
516 break;
517 case slow_subtype_check_id:
518 {
519 // Arguments :
520 // sub : stack param 0
521 // super: stack param 1
522 // raddr: Z_R14, blown by call
523 //
524 // Result : condition code 0 for match (bcondEqual will be true),
525 // condition code 2 for miss (bcondNotEqual will be true)
526 NearLabel miss;
527 const Register Rsubklass = Z_ARG2; // sub
528 const Register Rsuperklass = Z_ARG3; // super
529
530 // No args, but tmp registers that are killed.
531 const Register Rlength = Z_ARG4; // cache array length
532 const Register Rarray_ptr = Z_ARG5; // Current value from cache array.
533
534 if (UseCompressedOops) {
535 assert(Universe::heap() != nullptr, "java heap must be initialized to generate partial_subtype_check stub");
536 }
537
538 const int frame_size = 4*BytesPerWord + frame::z_abi_160_size;
539 // Save return pc. This is not necessary, but could be helpful
540 // in the case of crashes.
541 __ save_return_pc();
542 __ push_frame(frame_size);
543 // Save registers before changing them.
544 int i = 0;
545 __ z_stg(Rsubklass, (i++)*BytesPerWord + frame::z_abi_160_size, Z_SP);
546 __ z_stg(Rsuperklass, (i++)*BytesPerWord + frame::z_abi_160_size, Z_SP);
547 __ z_stg(Rlength, (i++)*BytesPerWord + frame::z_abi_160_size, Z_SP);
548 __ z_stg(Rarray_ptr, (i++)*BytesPerWord + frame::z_abi_160_size, Z_SP);
549 assert(i*BytesPerWord + frame::z_abi_160_size == frame_size, "check");
550
551 // Get sub and super from stack.
552 __ z_lg(Rsubklass, 0*BytesPerWord + FrameMap::first_available_sp_in_frame + frame_size, Z_SP);
553 __ z_lg(Rsuperklass, 1*BytesPerWord + FrameMap::first_available_sp_in_frame + frame_size, Z_SP);
554
555 __ check_klass_subtype_slow_path(Rsubklass, Rsuperklass, Rarray_ptr, Rlength, nullptr, &miss);
556
557 // Match falls through here.
558 i = 0;
559 __ z_lg(Rsubklass, (i++)*BytesPerWord + frame::z_abi_160_size, Z_SP);
560 __ z_lg(Rsuperklass, (i++)*BytesPerWord + frame::z_abi_160_size, Z_SP);
561 __ z_lg(Rlength, (i++)*BytesPerWord + frame::z_abi_160_size, Z_SP);
562 __ z_lg(Rarray_ptr, (i++)*BytesPerWord + frame::z_abi_160_size, Z_SP);
563 assert(i*BytesPerWord + frame::z_abi_160_size == frame_size, "check");
564 __ pop_frame();
565 // Return pc is still in R_14.
566 __ clear_reg(Z_R0_scratch); // Zero indicates a match. Set CC 0 (bcondEqual will be true)
567 __ z_br(Z_R14);
568
569 __ BIND(miss);
570 i = 0;
571 __ z_lg(Rsubklass, (i++)*BytesPerWord + frame::z_abi_160_size, Z_SP);
572 __ z_lg(Rsuperklass, (i++)*BytesPerWord + frame::z_abi_160_size, Z_SP);
573 __ z_lg(Rlength, (i++)*BytesPerWord + frame::z_abi_160_size, Z_SP);
574 __ z_lg(Rarray_ptr, (i++)*BytesPerWord + frame::z_abi_160_size, Z_SP);
575 assert(i*BytesPerWord + frame::z_abi_160_size == frame_size, "check");
576 __ pop_frame();
577 // return pc is still in R_14
578 __ load_const_optimized(Z_R0_scratch, 1); // One indicates a miss.
579 __ z_ltgr(Z_R0_scratch, Z_R0_scratch); // Set CC 2 (bcondNotEqual will be true).
580 __ z_br(Z_R14);
581 }
582 break;
583 case monitorenter_nofpu_id:
584 case monitorenter_id:
585 { // Z_R1_scratch : object
586 // Z_R13 : lock address (see LIRGenerator::syncTempOpr())
587 __ set_info("monitorenter", dont_gc_arguments);
588
589 int save_fpu_registers = (id == monitorenter_id);
590 // Make a frame and preserve the caller's caller-save registers.
591 OopMap* oop_map = save_live_registers(sasm, save_fpu_registers);
592
593 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, monitorenter), Z_R1_scratch, Z_R13);
594
595 oop_maps = new OopMapSet();
596 oop_maps->add_gc_map(call_offset, oop_map);
597 restore_live_registers(sasm, save_fpu_registers);
598
599 __ z_br(Z_R14);
600 }
601 break;
602
603 case monitorexit_nofpu_id:
604 case monitorexit_id:
605 { // Z_R1_scratch : lock address
606 // Note: really a leaf routine but must setup last java sp
607 // => Use call_RT for now (speed can be improved by
608 // doing last java sp setup manually).
609 __ set_info("monitorexit", dont_gc_arguments);
610
611 int save_fpu_registers = (id == monitorexit_id);
612 // Make a frame and preserve the caller's caller-save registers.
613 OopMap* oop_map = save_live_registers(sasm, save_fpu_registers);
614
615 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, monitorexit), Z_R1_scratch);
616
617 oop_maps = new OopMapSet();
618 oop_maps->add_gc_map(call_offset, oop_map);
619 restore_live_registers(sasm, save_fpu_registers);
620
621 __ z_br(Z_R14);
622 }
623 break;
624
625 case deoptimize_id:
626 { // Args: Z_R1_scratch: trap request
627 __ set_info("deoptimize", dont_gc_arguments);
628 Register trap_request = Z_R1_scratch;
629 OopMap* oop_map = save_live_registers(sasm);
630 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, deoptimize), trap_request);
631 oop_maps = new OopMapSet();
632 oop_maps->add_gc_map(call_offset, oop_map);
633 restore_live_registers(sasm);
634 DeoptimizationBlob* deopt_blob = SharedRuntime::deopt_blob();
635 assert(deopt_blob != nullptr, "deoptimization blob must have been created");
636 AddressLiteral dest(deopt_blob->unpack_with_reexecution());
637 __ load_const_optimized(Z_R1_scratch, dest);
638 __ z_br(Z_R1_scratch);
639 }
640 break;
641
642 case access_field_patching_id:
643 { __ set_info("access_field_patching", dont_gc_arguments);
644 oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, access_field_patching));
645 }
646 break;
647
648 case load_klass_patching_id:
649 { __ set_info("load_klass_patching", dont_gc_arguments);
650 // We should set up register map.
651 oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, move_klass_patching));
652 }
653 break;
654
655 case load_mirror_patching_id:
656 { __ set_info("load_mirror_patching", dont_gc_arguments);
657 oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, move_mirror_patching));
658 }
659 break;
660
661 case load_appendix_patching_id:
662 { __ set_info("load_appendix_patching", dont_gc_arguments);
663 oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, move_appendix_patching));
664 }
665 break;
666 #if 0
667 case dtrace_object_alloc_id:
668 { // rax,: object
669 StubFrame f(sasm, "dtrace_object_alloc", dont_gc_arguments);
670 // We can't gc here so skip the oopmap but make sure that all
671 // the live registers get saved.
672 save_live_registers(sasm, 1);
673
674 __ NOT_LP64(push(rax)) LP64_ONLY(mov(c_rarg0, rax));
675 __ call(RuntimeAddress(CAST_FROM_FN_PTR(address, static_cast<int (*)(oopDesc*)>(SharedRuntime::dtrace_object_alloc))));
676 NOT_LP64(__ pop(rax));
677
678 restore_live_registers(sasm);
679 }
680 break;
681
682 case fpu2long_stub_id:
683 {
684 // rax, and rdx are destroyed, but should be free since the result is returned there
685 // preserve rsi,ecx
686 __ push(rsi);
687 __ push(rcx);
688 LP64_ONLY(__ push(rdx);)
689
690 // check for NaN
691 Label return0, do_return, return_min_jlong, do_convert;
692
693 Address value_high_word(rsp, wordSize + 4);
694 Address value_low_word(rsp, wordSize);
695 Address result_high_word(rsp, 3*wordSize + 4);
696 Address result_low_word(rsp, 3*wordSize);
697
698 __ subptr(rsp, 32); // more than enough on 32bit
699 __ fst_d(value_low_word);
700 __ movl(rax, value_high_word);
701 __ andl(rax, 0x7ff00000);
702 __ cmpl(rax, 0x7ff00000);
703 __ jcc(Assembler::notEqual, do_convert);
704 __ movl(rax, value_high_word);
705 __ andl(rax, 0xfffff);
706 __ orl(rax, value_low_word);
707 __ jcc(Assembler::notZero, return0);
708
709 __ bind(do_convert);
710 __ fnstcw(Address(rsp, 0));
711 __ movzwl(rax, Address(rsp, 0));
712 __ orl(rax, 0xc00);
713 __ movw(Address(rsp, 2), rax);
714 __ fldcw(Address(rsp, 2));
715 __ fwait();
716 __ fistp_d(result_low_word);
717 __ fldcw(Address(rsp, 0));
718 __ fwait();
719 // This gets the entire long in rax on 64bit
720 __ movptr(rax, result_low_word);
721 // testing of high bits
722 __ movl(rdx, result_high_word);
723 __ mov(rcx, rax);
724 // What the heck is the point of the next instruction???
725 __ xorl(rcx, 0x0);
726 __ movl(rsi, 0x80000000);
727 __ xorl(rsi, rdx);
728 __ orl(rcx, rsi);
729 __ jcc(Assembler::notEqual, do_return);
730 __ fldz();
731 __ fcomp_d(value_low_word);
732 __ fnstsw_ax();
733 __ testl(rax, 0x4100); // ZF & CF == 0
734 __ jcc(Assembler::equal, return_min_jlong);
735 // return max_jlong
736 __ mov64(rax, CONST64(0x7fffffffffffffff));
737 __ jmp(do_return);
738
739 __ bind(return_min_jlong);
740 __ mov64(rax, UCONST64(0x8000000000000000));
741 __ jmp(do_return);
742
743 __ bind(return0);
744 __ fpop();
745 __ xorptr(rax, rax);
746
747 __ bind(do_return);
748 __ addptr(rsp, 32);
749 LP64_ONLY(__ pop(rdx);)
750 __ pop(rcx);
751 __ pop(rsi);
752 __ ret(0);
753 }
754 break;
755 #endif // TODO
756
757 case predicate_failed_trap_id:
758 {
759 __ set_info("predicate_failed_trap", dont_gc_arguments);
760
761 OopMap* map = save_live_registers(sasm);
762
763 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, predicate_failed_trap));
764 oop_maps = new OopMapSet();
765 oop_maps->add_gc_map(call_offset, map);
766 restore_live_registers(sasm);
767
768 DeoptimizationBlob* deopt_blob = SharedRuntime::deopt_blob();
769 assert(deopt_blob != nullptr, "deoptimization blob must have been created");
770
771 __ load_const_optimized(Z_R1_scratch, deopt_blob->unpack_with_reexecution());
772 __ z_br(Z_R1_scratch);
773 }
774 break;
775
776 default:
777 {
778 __ should_not_reach_here(FILE_AND_LINE, id);
779 }
780 break;
781 }
782 return oop_maps;
783 }
784
785 OopMapSet* Runtime1::generate_handle_exception(StubID id, StubAssembler *sasm) {
786 __ block_comment("generate_handle_exception");
787
788 // incoming parameters: Z_EXC_OOP, Z_EXC_PC
789
790 // Save registers if required.
791 OopMapSet* oop_maps = new OopMapSet();
792 OopMap* oop_map = nullptr;
793 Register reg_fp = Z_R1_scratch;
794
795 switch (id) {
796 case forward_exception_id: {
797 // We're handling an exception in the context of a compiled frame.
798 // The registers have been saved in the standard places. Perform
799 // an exception lookup in the caller and dispatch to the handler
800 // if found. Otherwise unwind and dispatch to the callers
801 // exception handler.
802 oop_map = generate_oop_map(sasm);
803
804 // Load and clear pending exception oop into.
805 __ z_lg(Z_EXC_OOP, Address(Z_thread, Thread::pending_exception_offset()));
806 __ clear_mem(Address(Z_thread, Thread::pending_exception_offset()), 8);
807
808 // Different stubs forward their exceptions; they should all have similar frame layouts
809 // (a) to find their return address (b) for a correct oop_map generated above.
810 assert(RegisterSaver::live_reg_frame_size(RegisterSaver::all_registers) ==
811 RegisterSaver::live_reg_frame_size(RegisterSaver::all_registers_except_r2), "requirement");
812
813 // Load issuing PC (the return address for this stub).
814 const int frame_size_in_bytes = sasm->frame_size() * VMRegImpl::slots_per_word * VMRegImpl::stack_slot_size;
815 __ z_lg(Z_EXC_PC, Address(Z_SP, frame_size_in_bytes + _z_common_abi(return_pc)));
816 DEBUG_ONLY(__ z_lay(reg_fp, Address(Z_SP, frame_size_in_bytes));)
817
818 // Make sure that the vm_results are cleared (may be unnecessary).
819 __ clear_mem(Address(Z_thread, JavaThread::vm_result_offset()), sizeof(oop));
820 __ clear_mem(Address(Z_thread, JavaThread::vm_result_2_offset()), sizeof(Metadata*));
821 break;
822 }
823 case handle_exception_nofpu_id:
824 case handle_exception_id:
825 // At this point all registers MAY be live.
826 DEBUG_ONLY(__ z_lgr(reg_fp, Z_SP);)
827 oop_map = save_live_registers(sasm, id != handle_exception_nofpu_id, Z_EXC_PC);
828 break;
829 case handle_exception_from_callee_id: {
830 // At this point all registers except Z_EXC_OOP and Z_EXC_PC are dead.
831 DEBUG_ONLY(__ z_lgr(reg_fp, Z_SP);)
832 __ save_return_pc(Z_EXC_PC);
833 const int frame_size_in_bytes = __ push_frame_abi160(0);
834 oop_map = new OopMap(frame_size_in_bytes / VMRegImpl::stack_slot_size, 0);
835 sasm->set_frame_size(frame_size_in_bytes / BytesPerWord);
836 break;
837 }
838 default: ShouldNotReachHere();
839 }
840
841 // Verify that only Z_EXC_OOP, and Z_EXC_PC are valid at this time.
842 __ invalidate_registers(Z_EXC_OOP, Z_EXC_PC, reg_fp);
843 // Verify that Z_EXC_OOP, contains a valid exception.
844 __ verify_not_null_oop(Z_EXC_OOP);
845
846 // Check that fields in JavaThread for exception oop and issuing pc
847 // are empty before writing to them.
848 __ asm_assert_mem8_is_zero(in_bytes(JavaThread::exception_oop_offset()), Z_thread, "exception oop already set : " FILE_AND_LINE, 0);
849 __ asm_assert_mem8_is_zero(in_bytes(JavaThread::exception_pc_offset()), Z_thread, "exception pc already set : " FILE_AND_LINE, 0);
850
851 // Save exception oop and issuing pc into JavaThread.
852 // (Exception handler will load it from here.)
853 __ z_stg(Z_EXC_OOP, Address(Z_thread, JavaThread::exception_oop_offset()));
854 __ z_stg(Z_EXC_PC, Address(Z_thread, JavaThread::exception_pc_offset()));
855
856 #ifdef ASSERT
857 { NearLabel ok;
858 __ z_cg(Z_EXC_PC, Address(reg_fp, _z_common_abi(return_pc)));
859 __ branch_optimized(Assembler::bcondEqual, ok);
860 __ stop("use throwing pc as return address (has bci & oop map)");
861 __ bind(ok);
862 }
863 #endif
864
865 // Compute the exception handler.
866 // The exception oop and the throwing pc are read from the fields in JavaThread.
867 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, exception_handler_for_pc));
868 oop_maps->add_gc_map(call_offset, oop_map);
869
870 // Z_RET(Z_R2): handler address
871 // will be the deopt blob if nmethod was deoptimized while we looked up
872 // handler regardless of whether handler existed in the nmethod.
873
874 // Only Z_R2, is valid at this time, all other registers have been destroyed by the runtime call.
875 __ invalidate_registers(Z_R2);
876
877 switch(id) {
878 case forward_exception_id:
879 case handle_exception_nofpu_id:
880 case handle_exception_id:
881 // Restore the registers that were saved at the beginning.
882 __ z_lgr(Z_R1_scratch, Z_R2); // Restoring live registers kills Z_R2.
883 restore_live_registers(sasm, id != handle_exception_nofpu_id); // Pops as well the frame.
884 __ z_br(Z_R1_scratch);
885 break;
886 case handle_exception_from_callee_id: {
887 __ pop_frame();
888 __ z_br(Z_R2); // Jump to exception handler.
889 }
890 break;
891 default: ShouldNotReachHere();
892 }
893
894 return oop_maps;
895 }
896
897
898 #undef __
899
900 const char *Runtime1::pd_name_for_address(address entry) {
901 return "<unknown function>";
902 }