1 /*
2 * Copyright (c) 1999, 2023, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2014, Red Hat Inc. All rights reserved.
4 * Copyright (c) 2020, 2023, Huawei Technologies Co., Ltd. All rights reserved.
5 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 *
7 * This code is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License version 2 only, as
9 * published by the Free Software Foundation.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 *
25 */
26
27 #include "precompiled.hpp"
28 #include "asm/assembler.hpp"
29 #include "c1/c1_CodeStubs.hpp"
30 #include "c1/c1_Defs.hpp"
31 #include "c1/c1_MacroAssembler.hpp"
32 #include "c1/c1_Runtime1.hpp"
33 #include "compiler/disassembler.hpp"
34 #include "compiler/oopMap.hpp"
35 #include "gc/shared/cardTable.hpp"
36 #include "gc/shared/cardTableBarrierSet.hpp"
37 #include "interpreter/interpreter.hpp"
38 #include "memory/universe.hpp"
39 #include "nativeInst_riscv.hpp"
40 #include "oops/oop.inline.hpp"
41 #include "prims/jvmtiExport.hpp"
42 #include "register_riscv.hpp"
43 #include "runtime/sharedRuntime.hpp"
44 #include "runtime/signature.hpp"
45 #include "runtime/stubRoutines.hpp"
46 #include "runtime/vframe.hpp"
47 #include "runtime/vframeArray.hpp"
48 #include "utilities/powerOfTwo.hpp"
49 #include "vmreg_riscv.inline.hpp"
50
51
52 // Implementation of StubAssembler
53
54 int StubAssembler::call_RT(Register oop_result, Register metadata_result, address entry, int args_size) {
55 // setup registers
56 assert(!(oop_result->is_valid() || metadata_result->is_valid()) || oop_result != metadata_result,
57 "registers must be different");
58 assert(oop_result != xthread && metadata_result != xthread, "registers must be different");
59 assert(args_size >= 0, "illegal args_size");
60 bool align_stack = false;
61
62 mv(c_rarg0, xthread);
63 set_num_rt_args(0); // Nothing on stack
64
65 Label retaddr;
66 set_last_Java_frame(sp, fp, retaddr, t0);
67
68 // do the call
69 rt_call(entry);
70 bind(retaddr);
71 int call_offset = offset();
72 // verify callee-saved register
73 #ifdef ASSERT
74 push_reg(x10, sp);
75 { Label L;
76 get_thread(x10);
77 beq(xthread, x10, L);
78 stop("StubAssembler::call_RT: xthread not callee saved?");
79 bind(L);
80 }
81 pop_reg(x10, sp);
82 #endif
83 reset_last_Java_frame(true);
84
85 // check for pending exceptions
86 { Label L;
87 // check for pending exceptions (java_thread is set upon return)
88 ld(t0, Address(xthread, in_bytes(Thread::pending_exception_offset())));
89 beqz(t0, L);
90 // exception pending => remove activation and forward to exception handler
91 // make sure that the vm_results are cleared
92 if (oop_result->is_valid()) {
93 sd(zr, Address(xthread, JavaThread::vm_result_offset()));
94 }
95 if (metadata_result->is_valid()) {
96 sd(zr, Address(xthread, JavaThread::vm_result_2_offset()));
97 }
98 if (frame_size() == no_frame_size) {
99 leave();
100 far_jump(RuntimeAddress(StubRoutines::forward_exception_entry()));
101 } else if (_stub_id == Runtime1::forward_exception_id) {
102 should_not_reach_here();
103 } else {
104 far_jump(RuntimeAddress(Runtime1::entry_for(Runtime1::forward_exception_id)));
105 }
106 bind(L);
107 }
108 // get oop results if there are any and reset the values in the thread
109 if (oop_result->is_valid()) {
110 get_vm_result(oop_result, xthread);
111 }
112 if (metadata_result->is_valid()) {
113 get_vm_result_2(metadata_result, xthread);
114 }
115 return call_offset;
116 }
117
118 int StubAssembler::call_RT(Register oop_result, Register metadata_result, address entry, Register arg1) {
119 mv(c_rarg1, arg1);
120 return call_RT(oop_result, metadata_result, entry, 1);
121 }
122
123 int StubAssembler::call_RT(Register oop_result, Register metadata_result, address entry, Register arg1, Register arg2) {
124 const int arg_num = 2;
125 if (c_rarg1 == arg2) {
126 if (c_rarg2 == arg1) {
127 xorr(arg1, arg1, arg2);
128 xorr(arg2, arg1, arg2);
129 xorr(arg1, arg1, arg2);
130 } else {
131 mv(c_rarg2, arg2);
132 mv(c_rarg1, arg1);
133 }
134 } else {
135 mv(c_rarg1, arg1);
136 mv(c_rarg2, arg2);
137 }
138 return call_RT(oop_result, metadata_result, entry, arg_num);
139 }
140
141 int StubAssembler::call_RT(Register oop_result, Register metadata_result, address entry, Register arg1, Register arg2, Register arg3) {
142 const int arg_num = 3;
143 // if there is any conflict use the stack
144 if (arg1 == c_rarg2 || arg1 == c_rarg3 ||
145 arg2 == c_rarg1 || arg2 == c_rarg3 ||
146 arg3 == c_rarg1 || arg3 == c_rarg2) {
147 const int arg1_sp_offset = 0;
148 const int arg2_sp_offset = 1;
149 const int arg3_sp_offset = 2;
150 addi(sp, sp, -(arg_num + 1) * wordSize);
151 sd(arg1, Address(sp, arg1_sp_offset * wordSize));
152 sd(arg2, Address(sp, arg2_sp_offset * wordSize));
153 sd(arg3, Address(sp, arg3_sp_offset * wordSize));
154
155 ld(c_rarg1, Address(sp, arg1_sp_offset * wordSize));
156 ld(c_rarg2, Address(sp, arg2_sp_offset * wordSize));
157 ld(c_rarg3, Address(sp, arg3_sp_offset * wordSize));
158 addi(sp, sp, (arg_num + 1) * wordSize);
159 } else {
160 mv(c_rarg1, arg1);
161 mv(c_rarg2, arg2);
162 mv(c_rarg3, arg3);
163 }
164 return call_RT(oop_result, metadata_result, entry, arg_num);
165 }
166
167 enum return_state_t {
168 does_not_return, requires_return
169 };
170
171 // Implementation of StubFrame
172
173 class StubFrame: public StackObj {
174 private:
175 StubAssembler* _sasm;
176 bool _return_state;
177
178 public:
179 StubFrame(StubAssembler* sasm, const char* name, bool must_gc_arguments, return_state_t return_state=requires_return);
180 void load_argument(int offset_in_words, Register reg);
181
182 ~StubFrame();
183 };;
184
185 void StubAssembler::prologue(const char* name, bool must_gc_arguments) {
186 set_info(name, must_gc_arguments);
187 enter();
188 }
189
190 void StubAssembler::epilogue() {
191 leave();
192 ret();
193 }
194
195 #define __ _sasm->
196
197 StubFrame::StubFrame(StubAssembler* sasm, const char* name, bool must_gc_arguments, return_state_t return_state) {
198 _sasm = sasm;
199 _return_state = return_state;
200 __ prologue(name, must_gc_arguments);
201 }
202
203 // load parameters that were stored with LIR_Assembler::store_parameter
204 // Note: offsets for store_parameter and load_argument must match
205 void StubFrame::load_argument(int offset_in_words, Register reg) {
206 __ load_parameter(offset_in_words, reg);
207 }
208
209
210 StubFrame::~StubFrame() {
211 if (_return_state == requires_return) {
212 __ epilogue();
213 } else {
214 __ should_not_reach_here();
215 }
216 _sasm = nullptr;
217 }
218
219 #undef __
220
221
222 // Implementation of Runtime1
223
224 #define __ sasm->
225
226 const int float_regs_as_doubles_size_in_slots = pd_nof_fpu_regs_frame_map * 2;
227
228 // Stack layout for saving/restoring all the registers needed during a runtime
229 // call (this includes deoptimization)
230 // Note: note that users of this frame may well have arguments to some runtime
231 // while these values are on the stack. These positions neglect those arguments
232 // but the code in save_live_registers will take the argument count into
233 // account.
234 //
235
236 enum reg_save_layout {
237 reg_save_frame_size = 32 /* float */ + 30 /* integer excluding x3, x4 */
238 };
239
240 // Save off registers which might be killed by calls into the runtime.
241 // Tries to smart of about FPU registers. In particular we separate
242 // saving and describing the FPU registers for deoptimization since we
243 // have to save the FPU registers twice if we describe them. The
244 // deopt blob is the only thing which needs to describe FPU registers.
245 // In all other cases it should be sufficient to simply save their
246 // current value.
247
248 static int cpu_reg_save_offsets[FrameMap::nof_cpu_regs];
249 static int fpu_reg_save_offsets[FrameMap::nof_fpu_regs];
250
251 static OopMap* generate_oop_map(StubAssembler* sasm, bool save_fpu_registers) {
252 int frame_size_in_bytes = reg_save_frame_size * BytesPerWord;
253 sasm->set_frame_size(frame_size_in_bytes / BytesPerWord);
254 int frame_size_in_slots = frame_size_in_bytes / sizeof(jint);
255 OopMap* oop_map = new OopMap(frame_size_in_slots, 0);
256 assert_cond(oop_map != nullptr);
257
258 // caller save registers only, see FrameMap::initialize
259 // in c1_FrameMap_riscv.cpp for detail.
260 const static Register caller_save_cpu_regs[FrameMap::max_nof_caller_save_cpu_regs] = {
261 x7, x10, x11, x12, x13, x14, x15, x16, x17, x28, x29, x30, x31
262 };
263
264 for (int i = 0; i < FrameMap::max_nof_caller_save_cpu_regs; i++) {
265 Register r = caller_save_cpu_regs[i];
266 int sp_offset = cpu_reg_save_offsets[r->encoding()];
267 oop_map->set_callee_saved(VMRegImpl::stack2reg(sp_offset),
268 r->as_VMReg());
269 }
270
271 // fpu_regs
272 if (save_fpu_registers) {
273 for (int i = 0; i < FrameMap::nof_fpu_regs; i++) {
274 FloatRegister r = as_FloatRegister(i);
275 int sp_offset = fpu_reg_save_offsets[i];
276 oop_map->set_callee_saved(VMRegImpl::stack2reg(sp_offset),
277 r->as_VMReg());
278 }
279 }
280 return oop_map;
281 }
282
283 static OopMap* save_live_registers(StubAssembler* sasm,
284 bool save_fpu_registers = true) {
285 __ block_comment("save_live_registers");
286
287 // if the number of pushed regs is odd, one slot will be reserved for alignment
288 __ push_reg(RegSet::range(x5, x31), sp); // integer registers except ra(x1) & sp(x2) & gp(x3) & tp(x4)
289
290 if (save_fpu_registers) {
291 // float registers
292 __ addi(sp, sp, -(FrameMap::nof_fpu_regs * wordSize));
293 for (int i = 0; i < FrameMap::nof_fpu_regs; i++) {
294 __ fsd(as_FloatRegister(i), Address(sp, i * wordSize));
295 }
296 } else {
297 // we define reg_save_layout = 62 as the fixed frame size,
298 // we should also sub 32 * wordSize to sp when save_fpu_registers == false
299 __ addi(sp, sp, -32 * wordSize);
300 }
301
302 return generate_oop_map(sasm, save_fpu_registers);
303 }
304
305 static void restore_live_registers(StubAssembler* sasm, bool restore_fpu_registers = true) {
306 if (restore_fpu_registers) {
307 for (int i = 0; i < FrameMap::nof_fpu_regs; i++) {
308 __ fld(as_FloatRegister(i), Address(sp, i * wordSize));
309 }
310 __ addi(sp, sp, FrameMap::nof_fpu_regs * wordSize);
311 } else {
312 // we define reg_save_layout = 64 as the fixed frame size,
313 // we should also add 32 * wordSize to sp when save_fpu_registers == false
314 __ addi(sp, sp, 32 * wordSize);
315 }
316
317 // if the number of popped regs is odd, the reserved slot for alignment will be removed
318 __ pop_reg(RegSet::range(x5, x31), sp); // integer registers except ra(x1) & sp(x2) & gp(x3) & tp(x4)
319 }
320
321 static void restore_live_registers_except_r10(StubAssembler* sasm, bool restore_fpu_registers = true) {
322 if (restore_fpu_registers) {
323 for (int i = 0; i < FrameMap::nof_fpu_regs; i++) {
324 __ fld(as_FloatRegister(i), Address(sp, i * wordSize));
325 }
326 __ addi(sp, sp, FrameMap::nof_fpu_regs * wordSize);
327 } else {
328 // we define reg_save_layout = 64 as the fixed frame size,
329 // we should also add 32 * wordSize to sp when save_fpu_registers == false
330 __ addi(sp, sp, 32 * wordSize);
331 }
332
333 // pop integer registers except ra(x1) & sp(x2) & gp(x3) & tp(x4) & x10
334 // there is one reserved slot for alignment on the stack in save_live_registers().
335 __ pop_reg(RegSet::range(x5, x9), sp); // pop x5 ~ x9 with the reserved slot for alignment
336 __ pop_reg(RegSet::range(x11, x31), sp); // pop x11 ~ x31; x10 will be automatically skipped here
337 }
338
339 void Runtime1::initialize_pd() {
340 int i = 0;
341 int sp_offset = 0;
342 const int step = 2; // SP offsets are in halfwords
343
344 // all float registers are saved explicitly
345 for (i = 0; i < FrameMap::nof_fpu_regs; i++) {
346 fpu_reg_save_offsets[i] = sp_offset;
347 sp_offset += step;
348 }
349
350 // a slot reserved for stack 16-byte alignment, see MacroAssembler::push_reg
351 sp_offset += step;
352 // we save x5 ~ x31, except x0 ~ x4: loop starts from x5
353 for (i = 5; i < FrameMap::nof_cpu_regs; i++) {
354 cpu_reg_save_offsets[i] = sp_offset;
355 sp_offset += step;
356 }
357 }
358
359 // target: the entry point of the method that creates and posts the exception oop
360 // has_argument: true if the exception needs arguments (passed in t0 and t1)
361
362 OopMapSet* Runtime1::generate_exception_throw(StubAssembler* sasm, address target, bool has_argument) {
363 // make a frame and preserve the caller's caller-save registers
364 OopMap* oop_map = save_live_registers(sasm);
365 assert_cond(oop_map != nullptr);
366 int call_offset = 0;
367 if (!has_argument) {
368 call_offset = __ call_RT(noreg, noreg, target);
369 } else {
370 __ mv(c_rarg1, t0);
371 __ mv(c_rarg2, t1);
372 call_offset = __ call_RT(noreg, noreg, target);
373 }
374 OopMapSet* oop_maps = new OopMapSet();
375 assert_cond(oop_maps != nullptr);
376 oop_maps->add_gc_map(call_offset, oop_map);
377
378 return oop_maps;
379 }
380
381 OopMapSet* Runtime1::generate_handle_exception(StubID id, StubAssembler *sasm) {
382 __ block_comment("generate_handle_exception");
383
384 // incoming parameters
385 const Register exception_oop = x10;
386 const Register exception_pc = x13;
387
388 OopMapSet* oop_maps = new OopMapSet();
389 assert_cond(oop_maps != nullptr);
390 OopMap* oop_map = nullptr;
391
392 switch (id) {
393 case forward_exception_id:
394 // We're handling an exception in the context of a compiled frame.
395 // The registers have been saved in the standard places. Perform
396 // an exception lookup in the caller and dispatch to the handler
397 // if found. Otherwise unwind and dispatch to the callers
398 // exception handler.
399 oop_map = generate_oop_map(sasm, 1 /* thread */);
400
401 // load and clear pending exception oop into x10
402 __ ld(exception_oop, Address(xthread, Thread::pending_exception_offset()));
403 __ sd(zr, Address(xthread, Thread::pending_exception_offset()));
404
405 // load issuing PC (the return address for this stub) into x13
406 __ ld(exception_pc, Address(fp, frame::return_addr_offset * BytesPerWord));
407
408 // make sure that the vm_results are cleared (may be unnecessary)
409 __ sd(zr, Address(xthread, JavaThread::vm_result_offset()));
410 __ sd(zr, Address(xthread, JavaThread::vm_result_2_offset()));
411 break;
412 case handle_exception_nofpu_id:
413 case handle_exception_id:
414 // At this point all registers MAY be live.
415 oop_map = save_live_registers(sasm, id != handle_exception_nofpu_id);
416 break;
417 case handle_exception_from_callee_id: {
418 // At this point all registers except exception oop (x10) and
419 // exception pc (ra) are dead.
420 const int frame_size = 2 /* fp, return address */;
421 oop_map = new OopMap(frame_size * VMRegImpl::slots_per_word, 0);
422 sasm->set_frame_size(frame_size);
423 break;
424 }
425 default: ShouldNotReachHere();
426 }
427
428 // verify that only x10 and x13 are valid at this time
429 __ invalidate_registers(false, true, true, false, true, true);
430 // verify that x10 contains a valid exception
431 __ verify_not_null_oop(exception_oop);
432
433 #ifdef ASSERT
434 // check that fields in JavaThread for exception oop and issuing pc are
435 // empty before writing to them
436 Label oop_empty;
437 __ ld(t0, Address(xthread, JavaThread::exception_oop_offset()));
438 __ beqz(t0, oop_empty);
439 __ stop("exception oop already set");
440 __ bind(oop_empty);
441
442 Label pc_empty;
443 __ ld(t0, Address(xthread, JavaThread::exception_pc_offset()));
444 __ beqz(t0, pc_empty);
445 __ stop("exception pc already set");
446 __ bind(pc_empty);
447 #endif
448
449 // save exception oop and issuing pc into JavaThread
450 // (exception handler will load it from here)
451 __ sd(exception_oop, Address(xthread, JavaThread::exception_oop_offset()));
452 __ sd(exception_pc, Address(xthread, JavaThread::exception_pc_offset()));
453
454 // patch throwing pc into return address (has bci & oop map)
455 __ sd(exception_pc, Address(fp, frame::return_addr_offset * BytesPerWord));
456
457 // compute the exception handler.
458 // the exception oop and the throwing pc are read from the fields in JavaThread
459 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, exception_handler_for_pc));
460 guarantee(oop_map != nullptr, "null oop_map!");
461 oop_maps->add_gc_map(call_offset, oop_map);
462
463 // x10: handler address
464 // will be the deopt blob if nmethod was deoptimized while we looked up
465 // handler regardless of whether handler existed in the nmethod.
466
467 // only x10 is valid at this time, all other registers have been destroyed by the runtime call
468 __ invalidate_registers(false, true, true, true, true, true);
469
470 // patch the return address, this stub will directly return to the exception handler
471 __ sd(x10, Address(fp, frame::return_addr_offset * BytesPerWord));
472
473 switch (id) {
474 case forward_exception_id:
475 case handle_exception_nofpu_id:
476 case handle_exception_id:
477 // Restore the registers that were saved at the beginning.
478 restore_live_registers(sasm, id != handle_exception_nofpu_id);
479 break;
480 case handle_exception_from_callee_id:
481 break;
482 default: ShouldNotReachHere();
483 }
484
485 return oop_maps;
486 }
487
488
489 void Runtime1::generate_unwind_exception(StubAssembler *sasm) {
490 // incoming parameters
491 const Register exception_oop = x10;
492 // other registers used in this stub
493 const Register handler_addr = x11;
494
495 if (AbortVMOnException) {
496 __ enter();
497 save_live_registers(sasm);
498 __ call_VM_leaf(CAST_FROM_FN_PTR(address, check_abort_on_vm_exception), x10);
499 restore_live_registers(sasm);
500 __ leave();
501 }
502
503 // verify that only x10, is valid at this time
504 __ invalidate_registers(false, true, true, true, true, true);
505
506 #ifdef ASSERT
507 // check that fields in JavaThread for exception oop and issuing pc are empty
508 Label oop_empty;
509 __ ld(t0, Address(xthread, JavaThread::exception_oop_offset()));
510 __ beqz(t0, oop_empty);
511 __ stop("exception oop must be empty");
512 __ bind(oop_empty);
513
514 Label pc_empty;
515 __ ld(t0, Address(xthread, JavaThread::exception_pc_offset()));
516 __ beqz(t0, pc_empty);
517 __ stop("exception pc must be empty");
518 __ bind(pc_empty);
519 #endif
520
521 // Save our return address because
522 // exception_handler_for_return_address will destroy it. We also
523 // save exception_oop
524 __ addi(sp, sp, -2 * wordSize);
525 __ sd(exception_oop, Address(sp, wordSize));
526 __ sd(ra, Address(sp));
527
528 // search the exception handler address of the caller (using the return address)
529 __ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::exception_handler_for_return_address), xthread, ra);
530 // x10: exception handler address of the caller
531
532 // Only x10 is valid at this time; all other registers have been
533 // destroyed by the call.
534 __ invalidate_registers(false, true, true, true, false, true);
535
536 // move result of call into correct register
537 __ mv(handler_addr, x10);
538
539 // get throwing pc (= return address).
540 // ra has been destroyed by the call
541 __ ld(ra, Address(sp));
542 __ ld(exception_oop, Address(sp, wordSize));
543 __ addi(sp, sp, 2 * wordSize);
544 __ mv(x13, ra);
545
546 __ verify_not_null_oop(exception_oop);
547
548 // continue at exception handler (return address removed)
549 // note: do *not* remove arguments when unwinding the
550 // activation since the caller assumes having
551 // all arguments on the stack when entering the
552 // runtime to determine the exception handler
553 // (GC happens at call site with arguments!)
554 // x10: exception oop
555 // x13: throwing pc
556 // x11: exception handler
557 __ jr(handler_addr);
558 }
559
560 OopMapSet* Runtime1::generate_patching(StubAssembler* sasm, address target) {
561 // use the maximum number of runtime-arguments here because it is difficult to
562 // distinguish each RT-Call.
563 // Note: This number affects also the RT-Call in generate_handle_exception because
564 // the oop-map is shared for all calls.
565 DeoptimizationBlob* deopt_blob = SharedRuntime::deopt_blob();
566 assert(deopt_blob != nullptr, "deoptimization blob must have been created");
567
568 OopMap* oop_map = save_live_registers(sasm);
569 assert_cond(oop_map != nullptr);
570
571 __ mv(c_rarg0, xthread);
572 Label retaddr;
573 __ set_last_Java_frame(sp, fp, retaddr, t0);
574 // do the call
575 __ rt_call(target);
576 __ bind(retaddr);
577 OopMapSet* oop_maps = new OopMapSet();
578 assert_cond(oop_maps != nullptr);
579 oop_maps->add_gc_map(__ offset(), oop_map);
580 // verify callee-saved register
581 #ifdef ASSERT
582 { Label L;
583 __ get_thread(t0);
584 __ beq(xthread, t0, L);
585 __ stop("StubAssembler::call_RT: xthread not callee saved?");
586 __ bind(L);
587 }
588 #endif
589 __ reset_last_Java_frame(true);
590
591 #ifdef ASSERT
592 // Check that fields in JavaThread for exception oop and issuing pc are empty
593 Label oop_empty;
594 __ ld(t0, Address(xthread, Thread::pending_exception_offset()));
595 __ beqz(t0, oop_empty);
596 __ stop("exception oop must be empty");
597 __ bind(oop_empty);
598
599 Label pc_empty;
600 __ ld(t0, Address(xthread, JavaThread::exception_pc_offset()));
601 __ beqz(t0, pc_empty);
602 __ stop("exception pc must be empty");
603 __ bind(pc_empty);
604 #endif
605
606 // Runtime will return true if the nmethod has been deoptimized, this is the
607 // expected scenario and anything else is an error. Note that we maintain a
608 // check on the result purely as a defensive measure.
609 Label no_deopt;
610 __ beqz(x10, no_deopt); // Have we deoptimized?
611
612 // Perform a re-execute. The proper return address is already on the stack,
613 // we just need to restore registers, pop all of our frames but the return
614 // address and jump to the deopt blob.
615
616 restore_live_registers(sasm);
617 __ leave();
618 __ far_jump(RuntimeAddress(deopt_blob->unpack_with_reexecution()));
619
620 __ bind(no_deopt);
621 __ stop("deopt not performed");
622
623 return oop_maps;
624 }
625
626 OopMapSet* Runtime1::generate_code_for(StubID id, StubAssembler* sasm) {
627 // for better readability
628 const bool dont_gc_arguments = false;
629
630 // default value; overwritten for some optimized stubs that are called from methods that do not use the fpu
631 bool save_fpu_registers = true;
632
633 // stub code & info for the different stubs
634 OopMapSet* oop_maps = nullptr;
635 switch (id) {
636 {
637 case forward_exception_id:
638 {
639 oop_maps = generate_handle_exception(id, sasm);
640 __ leave();
641 __ ret();
642 }
643 break;
644
645 case throw_div0_exception_id:
646 {
647 StubFrame f(sasm, "throw_div0_exception", dont_gc_arguments, does_not_return);
648 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_div0_exception), false);
649 }
650 break;
651
652 case throw_null_pointer_exception_id:
653 { StubFrame f(sasm, "throw_null_pointer_exception", dont_gc_arguments, does_not_return);
654 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_null_pointer_exception), false);
655 }
656 break;
657
658 case new_instance_id:
659 case fast_new_instance_id:
660 case fast_new_instance_init_check_id:
661 {
662 Register klass = x13; // Incoming
663 Register obj = x10; // Result
664
665 if (id == new_instance_id) {
666 __ set_info("new_instance", dont_gc_arguments);
667 } else if (id == fast_new_instance_id) {
668 __ set_info("fast new_instance", dont_gc_arguments);
669 } else {
670 assert(id == fast_new_instance_init_check_id, "bad StubID");
671 __ set_info("fast new_instance init check", dont_gc_arguments);
672 }
673
674 __ enter();
675 OopMap* map = save_live_registers(sasm);
676 assert_cond(map != nullptr);
677 int call_offset = __ call_RT(obj, noreg, CAST_FROM_FN_PTR(address, new_instance), klass);
678 oop_maps = new OopMapSet();
679 assert_cond(oop_maps != nullptr);
680 oop_maps->add_gc_map(call_offset, map);
681 restore_live_registers_except_r10(sasm);
682 __ verify_oop(obj);
683 __ leave();
684 __ ret();
685
686 // x10: new instance
687 }
688
689 break;
690
691 case counter_overflow_id:
692 {
693 Register bci = x10;
694 Register method = x11;
695 __ enter();
696 OopMap* map = save_live_registers(sasm);
697 assert_cond(map != nullptr);
698
699 const int bci_off = 0;
700 const int method_off = 1;
701 // Retrieve bci
702 __ lw(bci, Address(fp, bci_off * BytesPerWord));
703 // And a pointer to the Method*
704 __ ld(method, Address(fp, method_off * BytesPerWord));
705 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, counter_overflow), bci, method);
706 oop_maps = new OopMapSet();
707 assert_cond(oop_maps != nullptr);
708 oop_maps->add_gc_map(call_offset, map);
709 restore_live_registers(sasm);
710 __ leave();
711 __ ret();
712 }
713 break;
714
715 case new_type_array_id:
716 case new_object_array_id:
717 {
718 Register length = x9; // Incoming
719 Register klass = x13; // Incoming
720 Register obj = x10; // Result
721
722 if (id == new_type_array_id) {
723 __ set_info("new_type_array", dont_gc_arguments);
724 } else {
725 __ set_info("new_object_array", dont_gc_arguments);
726 }
727
728 #ifdef ASSERT
729 // assert object type is really an array of the proper kind
730 {
731 Label ok;
732 Register tmp = obj;
733 __ lwu(tmp, Address(klass, Klass::layout_helper_offset()));
734 __ sraiw(tmp, tmp, Klass::_lh_array_tag_shift);
735 int tag = ((id == new_type_array_id) ? Klass::_lh_array_tag_type_value : Klass::_lh_array_tag_obj_value);
736 __ mv(t0, tag);
737 __ beq(t0, tmp, ok);
738 __ stop("assert(is an array klass)");
739 __ should_not_reach_here();
740 __ bind(ok);
741 }
742 #endif // ASSERT
743
744 __ enter();
745 OopMap* map = save_live_registers(sasm);
746 assert_cond(map != nullptr);
747 int call_offset = 0;
748 if (id == new_type_array_id) {
749 call_offset = __ call_RT(obj, noreg, CAST_FROM_FN_PTR(address, new_type_array), klass, length);
750 } else {
751 call_offset = __ call_RT(obj, noreg, CAST_FROM_FN_PTR(address, new_object_array), klass, length);
752 }
753
754 oop_maps = new OopMapSet();
755 assert_cond(oop_maps != nullptr);
756 oop_maps->add_gc_map(call_offset, map);
757 restore_live_registers_except_r10(sasm);
758
759 __ verify_oop(obj);
760 __ leave();
761 __ ret();
762
763 // x10: new array
764 }
765 break;
766
767 case new_multi_array_id:
768 {
769 StubFrame f(sasm, "new_multi_array", dont_gc_arguments);
770 // x10: klass
771 // x9: rank
772 // x12: address of 1st dimension
773 OopMap* map = save_live_registers(sasm);
774 assert_cond(map != nullptr);
775 __ mv(c_rarg1, x10);
776 __ mv(c_rarg3, x12);
777 __ mv(c_rarg2, x9);
778 int call_offset = __ call_RT(x10, noreg, CAST_FROM_FN_PTR(address, new_multi_array), x11, x12, x13);
779
780 oop_maps = new OopMapSet();
781 assert_cond(oop_maps != nullptr);
782 oop_maps->add_gc_map(call_offset, map);
783 restore_live_registers_except_r10(sasm);
784
785 // x10: new multi array
786 __ verify_oop(x10);
787 }
788 break;
789
790 case register_finalizer_id:
791 {
792 __ set_info("register_finalizer", dont_gc_arguments);
793
794 // This is called via call_runtime so the arguments
795 // will be place in C abi locations
796 __ verify_oop(c_rarg0);
797
798 // load the klass and check the has finalizer flag
799 Label register_finalizer;
800 Register t = x15;
801 __ load_klass(t, x10);
802 __ lwu(t, Address(t, Klass::access_flags_offset()));
803 __ test_bit(t0, t, exact_log2(JVM_ACC_HAS_FINALIZER));
804 __ bnez(t0, register_finalizer);
805 __ ret();
806
807 __ bind(register_finalizer);
808 __ enter();
809 OopMap* oop_map = save_live_registers(sasm);
810 assert_cond(oop_map != nullptr);
811 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, SharedRuntime::register_finalizer), x10);
812 oop_maps = new OopMapSet();
813 assert_cond(oop_maps != nullptr);
814 oop_maps->add_gc_map(call_offset, oop_map);
815
816 // Now restore all the live registers
817 restore_live_registers(sasm);
818
819 __ leave();
820 __ ret();
821 }
822 break;
823
824 case throw_class_cast_exception_id:
825 {
826 StubFrame f(sasm, "throw_class_cast_exception", dont_gc_arguments, does_not_return);
827 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_class_cast_exception), true);
828 }
829 break;
830
831 case throw_incompatible_class_change_error_id:
832 {
833 StubFrame f(sasm, "throw_incompatible_class_cast_exception", dont_gc_arguments, does_not_return);
834 oop_maps = generate_exception_throw(sasm,
835 CAST_FROM_FN_PTR(address, throw_incompatible_class_change_error), false);
836 }
837 break;
838
839 case slow_subtype_check_id:
840 {
841 // Typical calling sequence:
842 // push klass_RInfo (object klass or other subclass)
843 // push sup_k_RInfo (array element klass or other superclass)
844 // jump to slow_subtype_check
845 // Note that the subclass is pushed first, and is therefore deepest.
846 enum layout {
847 x10_off, x10_off_hi,
848 x12_off, x12_off_hi,
849 x14_off, x14_off_hi,
850 x15_off, x15_off_hi,
851 sup_k_off, sup_k_off_hi,
852 klass_off, klass_off_hi,
853 framesize,
854 result_off = sup_k_off
855 };
856
857 __ set_info("slow_subtype_check", dont_gc_arguments);
858 __ push_reg(RegSet::of(x10, x12, x14, x15), sp);
859
860 __ ld(x14, Address(sp, (klass_off) * VMRegImpl::stack_slot_size)); // sub klass
861 __ ld(x10, Address(sp, (sup_k_off) * VMRegImpl::stack_slot_size)); // super klass
862
863 Label miss;
864 __ check_klass_subtype_slow_path(x14, x10, x12, x15, nullptr, &miss);
865
866 // fallthrough on success:
867 __ mv(t0, 1);
868 __ sd(t0, Address(sp, (result_off) * VMRegImpl::stack_slot_size)); // result
869 __ pop_reg(RegSet::of(x10, x12, x14, x15), sp);
870 __ ret();
871
872 __ bind(miss);
873 __ sd(zr, Address(sp, (result_off) * VMRegImpl::stack_slot_size)); // result
874 __ pop_reg(RegSet::of(x10, x12, x14, x15), sp);
875 __ ret();
876 }
877 break;
878
879 case monitorenter_nofpu_id:
880 save_fpu_registers = false;
881 // fall through
882 case monitorenter_id:
883 {
884 StubFrame f(sasm, "monitorenter", dont_gc_arguments);
885 OopMap* map = save_live_registers(sasm, save_fpu_registers);
886 assert_cond(map != nullptr);
887
888 // Called with store_parameter and not C abi
889 f.load_argument(1, x10); // x10: object
890 f.load_argument(0, x11); // x11: lock address
891
892 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, monitorenter), x10, x11);
893
894 oop_maps = new OopMapSet();
895 assert_cond(oop_maps != nullptr);
896 oop_maps->add_gc_map(call_offset, map);
897 restore_live_registers(sasm, save_fpu_registers);
898 }
899 break;
900
901 case monitorexit_nofpu_id:
902 save_fpu_registers = false;
903 // fall through
904 case monitorexit_id:
905 {
906 StubFrame f(sasm, "monitorexit", dont_gc_arguments);
907 OopMap* map = save_live_registers(sasm, save_fpu_registers);
908 assert_cond(map != nullptr);
909
910 // Called with store_parameter and not C abi
911 f.load_argument(0, x10); // x10: lock address
912
913 // note: really a leaf routine but must setup last java sp
914 // => use call_RT for now (speed can be improved by
915 // doing last java sp setup manually)
916 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, monitorexit), x10);
917
918 oop_maps = new OopMapSet();
919 assert_cond(oop_maps != nullptr);
920 oop_maps->add_gc_map(call_offset, map);
921 restore_live_registers(sasm, save_fpu_registers);
922 }
923 break;
924
925 case deoptimize_id:
926 {
927 StubFrame f(sasm, "deoptimize", dont_gc_arguments, does_not_return);
928 OopMap* oop_map = save_live_registers(sasm);
929 assert_cond(oop_map != nullptr);
930 f.load_argument(0, c_rarg1);
931 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, deoptimize), c_rarg1);
932
933 oop_maps = new OopMapSet();
934 assert_cond(oop_maps != nullptr);
935 oop_maps->add_gc_map(call_offset, oop_map);
936 restore_live_registers(sasm);
937 DeoptimizationBlob* deopt_blob = SharedRuntime::deopt_blob();
938 assert(deopt_blob != nullptr, "deoptimization blob must have been created");
939 __ leave();
940 __ far_jump(RuntimeAddress(deopt_blob->unpack_with_reexecution()));
941 }
942 break;
943
944 case throw_range_check_failed_id:
945 {
946 StubFrame f(sasm, "range_check_failed", dont_gc_arguments, does_not_return);
947 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_range_check_exception), true);
948 }
949 break;
950
951 case unwind_exception_id:
952 {
953 __ set_info("unwind_exception", dont_gc_arguments);
954 // note: no stubframe since we are about to leave the current
955 // activation and we are calling a leaf VM function only.
956 generate_unwind_exception(sasm);
957 }
958 break;
959
960 case access_field_patching_id:
961 {
962 StubFrame f(sasm, "access_field_patching", dont_gc_arguments, does_not_return);
963 // we should set up register map
964 oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, access_field_patching));
965 }
966 break;
967
968 case load_klass_patching_id:
969 {
970 StubFrame f(sasm, "load_klass_patching", dont_gc_arguments, does_not_return);
971 // we should set up register map
972 oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, move_klass_patching));
973 }
974 break;
975
976 case load_mirror_patching_id:
977 {
978 StubFrame f(sasm, "load_mirror_patching", dont_gc_arguments, does_not_return);
979 // we should set up register map
980 oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, move_mirror_patching));
981 }
982 break;
983
984 case load_appendix_patching_id:
985 {
986 StubFrame f(sasm, "load_appendix_patching", dont_gc_arguments, does_not_return);
987 // we should set up register map
988 oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, move_appendix_patching));
989 }
990 break;
991
992 case handle_exception_nofpu_id:
993 case handle_exception_id:
994 {
995 StubFrame f(sasm, "handle_exception", dont_gc_arguments);
996 oop_maps = generate_handle_exception(id, sasm);
997 }
998 break;
999
1000 case handle_exception_from_callee_id:
1001 {
1002 StubFrame f(sasm, "handle_exception_from_callee", dont_gc_arguments);
1003 oop_maps = generate_handle_exception(id, sasm);
1004 }
1005 break;
1006
1007 case throw_index_exception_id:
1008 {
1009 StubFrame f(sasm, "index_range_check_failed", dont_gc_arguments, does_not_return);
1010 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_index_exception), true);
1011 }
1012 break;
1013
1014 case throw_array_store_exception_id:
1015 {
1016 StubFrame f(sasm, "throw_array_store_exception", dont_gc_arguments, does_not_return);
1017 // tos + 0: link
1018 // + 1: return address
1019 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_array_store_exception), true);
1020 }
1021 break;
1022
1023 case predicate_failed_trap_id:
1024 {
1025 StubFrame f(sasm, "predicate_failed_trap", dont_gc_arguments, does_not_return);
1026
1027 OopMap* map = save_live_registers(sasm);
1028 assert_cond(map != nullptr);
1029
1030 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, predicate_failed_trap));
1031 oop_maps = new OopMapSet();
1032 assert_cond(oop_maps != nullptr);
1033 oop_maps->add_gc_map(call_offset, map);
1034 restore_live_registers(sasm);
1035 __ leave();
1036 DeoptimizationBlob* deopt_blob = SharedRuntime::deopt_blob();
1037 assert(deopt_blob != nullptr, "deoptimization blob must have been created");
1038
1039 __ far_jump(RuntimeAddress(deopt_blob->unpack_with_reexecution()));
1040 }
1041 break;
1042
1043 case dtrace_object_alloc_id:
1044 { // c_rarg0: object
1045 StubFrame f(sasm, "dtrace_object_alloc", dont_gc_arguments);
1046 save_live_registers(sasm);
1047
1048 __ call_VM_leaf(CAST_FROM_FN_PTR(address, static_cast<int (*)(oopDesc*)>(SharedRuntime::dtrace_object_alloc)), c_rarg0);
1049
1050 restore_live_registers(sasm);
1051 }
1052 break;
1053
1054 default:
1055 {
1056 StubFrame f(sasm, "unimplemented entry", dont_gc_arguments, does_not_return);
1057 __ mv(x10, (int)id);
1058 __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, unimplemented_entry), x10);
1059 __ should_not_reach_here();
1060 }
1061 break;
1062 }
1063 }
1064 return oop_maps;
1065 }
1066
1067 #undef __
1068
1069 const char *Runtime1::pd_name_for_address(address entry) { Unimplemented(); return 0; }