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[pcsx_rearmed.git] / deps / lightrec / interpreter.c
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98fa08a5 1// SPDX-License-Identifier: LGPL-2.1-or-later
d16005f8 2/*
98fa08a5 3 * Copyright (C) 2019-2021 Paul Cercueil <paul@crapouillou.net>
d16005f8
PC		 4 */
5
6#include "disassembler.h"
7#include "interpreter.h"
8#include "lightrec-private.h"
9#include "optimizer.h"
10#include "regcache.h"
11
12#include <stdbool.h>
13
14struct interpreter;
15
16static u32 int_CP0(struct interpreter *inter);
17static u32 int_CP2(struct interpreter *inter);
18static u32 int_SPECIAL(struct interpreter *inter);
cb72ea13 19static u32 int_META(struct interpreter *inter);
d16005f8
PC		 20static u32 int_REGIMM(struct interpreter *inter);
21static u32 int_branch(struct interpreter *inter, u32 pc,
22 union code code, bool branch);
23
24typedef u32 (*lightrec_int_func_t)(struct interpreter *inter);
25
26static const lightrec_int_func_t int_standard[64];
27
28struct interpreter {
29 struct lightrec_state *state;
30 struct block *block;
31 struct opcode *op;
32 u32 cycles;
33 bool delay_slot;
98fa08a5 34 u16 offset;
d16005f8
PC		 35};
36
98fa08a5
PC		 37static u32 int_get_branch_pc(const struct interpreter *inter)
38{
39 return get_branch_pc(inter->block, inter->offset, 0);
40}
41
42static inline u32 int_get_ds_pc(const struct interpreter *inter, s16 imm)
43{
44 return get_ds_pc(inter->block, inter->offset, imm);
45}
46
47static inline struct opcode *next_op(const struct interpreter *inter)
48{
cb72ea13 49 return &inter->op[1];
98fa08a5
PC		 50}
51
d16005f8
PC		 52static inline u32 execute(lightrec_int_func_t func, struct interpreter *inter)
53{
54 return (*func)(inter);
55}
56
98fa08a5
PC		 57static inline u32 lightrec_int_op(struct interpreter *inter)
58{
59 return execute(int_standard[inter->op->i.op], inter);
60}
61
d16005f8
PC		 62static inline u32 jump_skip(struct interpreter *inter)
63{
98fa08a5
PC		 64 inter->op = next_op(inter);
65 inter->offset++;
d16005f8 66
03535202 67 if (op_flag_sync(inter->op->flags)) {
98fa08a5
PC		 68 inter->state->current_cycle += inter->cycles;
69 inter->cycles = 0;
70 }
71
72 return lightrec_int_op(inter);
d16005f8
PC		 73}
74
75static inline u32 jump_next(struct interpreter *inter)
76{
684432ad 77 inter->cycles += lightrec_cycles_of_opcode(inter->state, inter->op->c);
d16005f8
PC		 78
79 if (unlikely(inter->delay_slot))
80 return 0;
81
82 return jump_skip(inter);
83}
84
85static inline u32 jump_after_branch(struct interpreter *inter)
86{
684432ad 87 inter->cycles += lightrec_cycles_of_opcode(inter->state, inter->op->c);
d16005f8
PC		 88
89 if (unlikely(inter->delay_slot))
90 return 0;
91
98fa08a5
PC		 92 inter->op = next_op(inter);
93 inter->offset++;
d16005f8
PC		 94
95 return jump_skip(inter);
96}
97
98static void update_cycles_before_branch(struct interpreter *inter)
99{
100 u32 cycles;
101
102 if (!inter->delay_slot) {
684432ad 103 cycles = lightrec_cycles_of_opcode(inter->state, inter->op->c);
d16005f8 104
03535202
PC		 105 if (!op_flag_no_ds(inter->op->flags) &&
106 has_delay_slot(inter->op->c))
684432ad 107 cycles += lightrec_cycles_of_opcode(inter->state, next_op(inter)->c);
d16005f8
PC		 108
109 inter->cycles += cycles;
110 inter->state->current_cycle += inter->cycles;
111 inter->cycles = -cycles;
112 }
113}
114
115static bool is_branch_taken(const u32 *reg_cache, union code op)
116{
117 switch (op.i.op) {
118 case OP_SPECIAL:
119 return op.r.op == OP_SPECIAL_JR || op.r.op == OP_SPECIAL_JALR;
120 case OP_J:
121 case OP_JAL:
122 return true;
123 case OP_BEQ:
d16005f8
PC		 124 return reg_cache[op.r.rs] == reg_cache[op.r.rt];
125 case OP_BNE:
d16005f8
PC		 126 return reg_cache[op.r.rs] != reg_cache[op.r.rt];
127 case OP_REGIMM:
128 switch (op.r.rt) {
129 case OP_REGIMM_BLTZ:
130 case OP_REGIMM_BLTZAL:
131 return (s32)reg_cache[op.r.rs] < 0;
132 case OP_REGIMM_BGEZ:
133 case OP_REGIMM_BGEZAL:
134 return (s32)reg_cache[op.r.rs] >= 0;
135 }
136 default:
137 break;
138 }
139
140 return false;
141}
142
143static u32 int_delay_slot(struct interpreter *inter, u32 pc, bool branch)
144{
145 struct lightrec_state *state = inter->state;
98fa08a5
PC		 146 u32 *reg_cache = state->regs.gpr;
147 struct opcode new_op, *op = next_op(inter);
d16005f8
PC		 148 union code op_next;
149 struct interpreter inter2 = {
150 .state = state,
151 .cycles = inter->cycles,
152 .delay_slot = true,
153 .block = NULL,
154 };
155 bool run_first_op = false, dummy_ld = false, save_rs = false,
156 load_in_ds, branch_in_ds = false, branch_at_addr = false,
157 branch_taken;
f5ee77ca 158 u32 new_rt, old_rs = 0, new_rs = 0;
d16005f8
PC		 159 u32 next_pc, ds_next_pc;
160 u32 cause, epc;
161
162 if (op->i.op == OP_CP0 && op->r.rs == OP_CP0_RFE) {
163 /* When an IRQ happens, the PSX exception handlers (when done)
164 * will jump back to the instruction that was executed right
165 * before the IRQ, unless it was a GTE opcode; in that case, it
166 * jumps to the instruction right after.
167 * Since we will never handle the IRQ right after a GTE opcode,
168 * but on branch boundaries, we need to adjust the return
169 * address so that the GTE opcode is effectively executed.
170 */
98fa08a5
PC		 171 cause = state->regs.cp0[13];
172 epc = state->regs.cp0[14];
d16005f8
PC		 173
174 if (!(cause & 0x7c) && epc == pc - 4)
175 pc -= 4;
176 }
177
178 if (inter->delay_slot) {
179 /* The branch opcode was in a delay slot of another branch
180 * opcode. Just return the target address of the second
181 * branch. */
182 return pc;
183 }
184
185 /* An opcode located in the delay slot performing a delayed read
186 * requires special handling; we will always resort to using the
187 * interpreter in that case.
188 * Same goes for when we have a branch in a delay slot of another
189 * branch. */
cb72ea13 190 load_in_ds = opcode_is_load(op->c) || opcode_is_mfc(op->c);
d16005f8
PC		 191 branch_in_ds = has_delay_slot(op->c);
192
193 if (branch) {
194 if (load_in_ds || branch_in_ds)
195 op_next = lightrec_read_opcode(state, pc);
196
197 if (load_in_ds) {
198 /* Verify that the next block actually reads the
199 * destination register of the delay slot opcode. */
200 run_first_op = opcode_reads_register(op_next, op->r.rt);
201 }
202
203 if (branch_in_ds) {
204 run_first_op = true;
205 next_pc = pc + 4;
206 }
207
208 if (load_in_ds && run_first_op) {
209 next_pc = pc + 4;
210
211 /* If the first opcode of the next block writes the
212 * regiser used as the address for the load, we need to
213 * reset to the old value after it has been executed,
214 * then restore the new value after the delay slot
215 * opcode has been executed. */
216 save_rs = opcode_reads_register(op->c, op->r.rs) &&
217 opcode_writes_register(op_next, op->r.rs);
218 if (save_rs)
219 old_rs = reg_cache[op->r.rs];
220
221 /* If both the first opcode of the next block and the
222 * delay slot opcode write to the same register, the
223 * value written by the delay slot opcode is
224 * discarded. */
225 dummy_ld = opcode_writes_register(op_next, op->r.rt);
226 }
227
228 if (!run_first_op) {
229 next_pc = pc;
230 } else if (has_delay_slot(op_next)) {
231 /* The first opcode of the next block is a branch, so we
232 * cannot execute it here, because of the load delay.
233 * Just check whether or not the branch would be taken,
234 * and save that info into the interpreter struct. */
235 branch_at_addr = true;
236 branch_taken = is_branch_taken(reg_cache, op_next);
237 pr_debug("Target of impossible branch is a branch, "
238 "%staken.\n", branch_taken ? "" : "not ");
684432ad 239 inter->cycles += lightrec_cycles_of_opcode(inter->state, op_next);
a59e5536 240 old_rs = reg_cache[op_next.r.rs];
d16005f8
PC		 241 } else {
242 new_op.c = op_next;
243 new_op.flags = 0;
d16005f8 244 inter2.op = &new_op;
cb72ea13 245 inter2.offset = 0;
d16005f8
PC		 246
247 /* Execute the first opcode of the next block */
98fa08a5 248 lightrec_int_op(&inter2);
d16005f8
PC		 249
250 if (save_rs) {
251 new_rs = reg_cache[op->r.rs];
252 reg_cache[op->r.rs] = old_rs;
253 }
254
684432ad 255 inter->cycles += lightrec_cycles_of_opcode(inter->state, op_next);
d16005f8
PC		 256 }
257 } else {
98fa08a5 258 next_pc = int_get_ds_pc(inter, 2);
d16005f8
PC		 259 }
260
261 inter2.block = inter->block;
262 inter2.op = op;
263 inter2.cycles = inter->cycles;
cb72ea13 264 inter2.offset = inter->offset + 1;
d16005f8
PC		 265
266 if (dummy_ld)
267 new_rt = reg_cache[op->r.rt];
268
269 /* Execute delay slot opcode */
98fa08a5 270 ds_next_pc = lightrec_int_op(&inter2);
a59e5536 271
272 if (branch_at_addr) {
273 if (op_next.i.op == OP_SPECIAL)
274 /* TODO: Handle JALR setting $ra */
275 ds_next_pc = old_rs;
276 else if (op_next.i.op == OP_J || op_next.i.op == OP_JAL)
277 /* TODO: Handle JAL setting $ra */
278 ds_next_pc = (pc & 0xf0000000) | (op_next.j.imm << 2);
279 else
280 ds_next_pc = pc + 4 + ((s16)op_next.i.imm << 2);
281 }
d16005f8
PC		 282
283 if (branch_at_addr && !branch_taken) {
284 /* If the branch at the target of the branch opcode is not
285 * taken, we jump to its delay slot */
286 next_pc = pc + sizeof(u32);
a59e5536 287 } else if (branch_at_addr || (!branch && branch_in_ds)) {
d16005f8
PC		 288 next_pc = ds_next_pc;
289 }
290
291 if (save_rs)
292 reg_cache[op->r.rs] = new_rs;
293 if (dummy_ld)
294 reg_cache[op->r.rt] = new_rt;
295
684432ad 296 inter->cycles += lightrec_cycles_of_opcode(inter->state, op->c);
d16005f8
PC		 297
298 if (branch_at_addr && branch_taken) {
299 /* If the branch at the target of the branch opcode is taken,
300 * we execute its delay slot here, and jump to its target
301 * address. */
302 op_next = lightrec_read_opcode(state, pc + 4);
303
304 new_op.c = op_next;
305 new_op.flags = 0;
d16005f8
PC		 306 inter2.op = &new_op;
307 inter2.block = NULL;
308
684432ad 309 inter->cycles += lightrec_cycles_of_opcode(inter->state, op_next);
d16005f8
PC		 310
311 pr_debug("Running delay slot of branch at target of impossible "
312 "branch\n");
98fa08a5 313 lightrec_int_op(&inter2);
d16005f8
PC		 314 }
315
316 return next_pc;
317}
318
319static u32 int_unimplemented(struct interpreter *inter)
320{
e26c79a8 321 lightrec_set_exit_flags(inter->state, LIGHTREC_EXIT_UNKNOWN_OP);
d16005f8 322
e26c79a8 323 return inter->block->pc + (inter->offset << 2);
d16005f8
PC		 324}
325
326static u32 int_jump(struct interpreter *inter, bool link)
327{
328 struct lightrec_state *state = inter->state;
98fa08a5 329 u32 old_pc = int_get_branch_pc(inter);
d16005f8
PC		 330 u32 pc = (old_pc & 0xf0000000) | (inter->op->j.imm << 2);
331
332 if (link)
98fa08a5 333 state->regs.gpr[31] = old_pc + 8;
d16005f8 334
03535202 335 if (op_flag_no_ds(inter->op->flags))
d16005f8
PC		 336 return pc;
337
338 return int_delay_slot(inter, pc, true);
339}
340
341static u32 int_J(struct interpreter *inter)
342{
343 return int_jump(inter, false);
344}
345
346static u32 int_JAL(struct interpreter *inter)
347{
348 return int_jump(inter, true);
349}
350
351static u32 int_jumpr(struct interpreter *inter, u8 link_reg)
352{
353 struct lightrec_state *state = inter->state;
03535202
PC		 354 u32 old_pc = int_get_branch_pc(inter);
355 u32 next_pc = state->regs.gpr[inter->op->r.rs];
d16005f8 356
03535202
PC		 357 if (link_reg)
358 state->regs.gpr[link_reg] = old_pc + 8;
359
360 if (op_flag_no_ds(inter->op->flags))
d16005f8
PC		 361 return next_pc;
362
363 return int_delay_slot(inter, next_pc, true);
364}
365
366static u32 int_special_JR(struct interpreter *inter)
367{
368 return int_jumpr(inter, 0);
369}
370
371static u32 int_special_JALR(struct interpreter *inter)
372{
373 return int_jumpr(inter, inter->op->r.rd);
374}
375
376static u32 int_do_branch(struct interpreter *inter, u32 old_pc, u32 next_pc)
377{
03535202 378 if (!inter->delay_slot && op_flag_local_branch(inter->op->flags) &&
d16005f8
PC		 379 (s16)inter->op->c.i.imm >= 0) {
380 next_pc = old_pc + ((1 + (s16)inter->op->c.i.imm) << 2);
98fa08a5 381 next_pc = lightrec_emulate_block(inter->state, inter->block, next_pc);
d16005f8
PC		 382 }
383
384 return next_pc;
385}
386
387static u32 int_branch(struct interpreter *inter, u32 pc,
388 union code code, bool branch)
389{
390 u32 next_pc = pc + 4 + ((s16)code.i.imm << 2);
391
392 update_cycles_before_branch(inter);
393
03535202 394 if (op_flag_no_ds(inter->op->flags)) {
d16005f8
PC		 395 if (branch)
396 return int_do_branch(inter, pc, next_pc);
397 else
398 return jump_next(inter);
399 }
400
401 if (!inter->delay_slot)
402 next_pc = int_delay_slot(inter, next_pc, branch);
403
404 if (branch)
405 return int_do_branch(inter, pc, next_pc);
406
03535202 407 if (op_flag_emulate_branch(inter->op->flags))
d16005f8
PC		 408 return pc + 8;
409 else
410 return jump_after_branch(inter);
411}
412
413static u32 int_beq(struct interpreter *inter, bool bne)
414{
98fa08a5 415 u32 rs, rt, old_pc = int_get_branch_pc(inter);
d16005f8 416
98fa08a5
PC		 417 rs = inter->state->regs.gpr[inter->op->i.rs];
418 rt = inter->state->regs.gpr[inter->op->i.rt];
d16005f8
PC		 419
420 return int_branch(inter, old_pc, inter->op->c, (rs == rt) ^ bne);
421}
422
423static u32 int_BEQ(struct interpreter *inter)
424{
425 return int_beq(inter, false);
426}
427
428static u32 int_BNE(struct interpreter *inter)
429{
430 return int_beq(inter, true);
431}
432
433static u32 int_bgez(struct interpreter *inter, bool link, bool lt, bool regimm)
434{
98fa08a5 435 u32 old_pc = int_get_branch_pc(inter);
d16005f8
PC		 436 s32 rs;
437
438 if (link)
98fa08a5 439 inter->state->regs.gpr[31] = old_pc + 8;
d16005f8 440
98fa08a5 441 rs = (s32)inter->state->regs.gpr[inter->op->i.rs];
d16005f8
PC		 442
443 return int_branch(inter, old_pc, inter->op->c,
444 ((regimm && !rs) || rs > 0) ^ lt);
445}
446
447static u32 int_regimm_BLTZ(struct interpreter *inter)
448{
449 return int_bgez(inter, false, true, true);
450}
451
452static u32 int_regimm_BGEZ(struct interpreter *inter)
453{
454 return int_bgez(inter, false, false, true);
455}
456
457static u32 int_regimm_BLTZAL(struct interpreter *inter)
458{
459 return int_bgez(inter, true, true, true);
460}
461
462static u32 int_regimm_BGEZAL(struct interpreter *inter)
463{
464 return int_bgez(inter, true, false, true);
465}
466
467static u32 int_BLEZ(struct interpreter *inter)
468{
469 return int_bgez(inter, false, true, false);
470}
471
472static u32 int_BGTZ(struct interpreter *inter)
473{
474 return int_bgez(inter, false, false, false);
475}
476
477static u32 int_cfc(struct interpreter *inter)
478{
479 struct lightrec_state *state = inter->state;
480 const struct opcode *op = inter->op;
481 u32 val;
482
483 val = lightrec_mfc(state, op->c);
484
485 if (likely(op->r.rt))
98fa08a5 486 state->regs.gpr[op->r.rt] = val;
d16005f8
PC		 487
488 return jump_next(inter);
489}
490
491static u32 int_ctc(struct interpreter *inter)
492{
493 struct lightrec_state *state = inter->state;
494 const struct opcode *op = inter->op;
495
9259d748 496 lightrec_mtc(state, op->c, op->r.rd, state->regs.gpr[op->r.rt]);
d16005f8
PC		 497
498 /* If we have a MTC0 or CTC0 to CP0 register 12 (Status) or 13 (Cause),
499 * return early so that the emulator will be able to check software
500 * interrupt status. */
03535202 501 if (!op_flag_no_ds(inter->op->flags) &&
a59e5536 502 op->i.op == OP_CP0 && (op->r.rd == 12 || op->r.rd == 13))
98fa08a5 503 return int_get_ds_pc(inter, 1);
d16005f8
PC		 504 else
505 return jump_next(inter);
506}
507
508static u32 int_cp0_RFE(struct interpreter *inter)
509{
98fa08a5 510 lightrec_rfe(inter->state);
d16005f8
PC		 511
512 return jump_next(inter);
513}
514
515static u32 int_CP(struct interpreter *inter)
516{
98fa08a5 517 lightrec_cp(inter->state, inter->op->c);
d16005f8
PC		 518
519 return jump_next(inter);
520}
521
522static u32 int_ADDI(struct interpreter *inter)
523{
98fa08a5 524 u32 *reg_cache = inter->state->regs.gpr;
d16005f8
PC		 525 struct opcode_i *op = &inter->op->i;
526
527 if (likely(op->rt))
528 reg_cache[op->rt] = reg_cache[op->rs] + (s32)(s16)op->imm;
529
530 return jump_next(inter);
531}
532
533static u32 int_SLTI(struct interpreter *inter)
534{
98fa08a5 535 u32 *reg_cache = inter->state->regs.gpr;
d16005f8
PC		 536 struct opcode_i *op = &inter->op->i;
537
538 if (likely(op->rt))
539 reg_cache[op->rt] = (s32)reg_cache[op->rs] < (s32)(s16)op->imm;
540
541 return jump_next(inter);
542}
543
544static u32 int_SLTIU(struct interpreter *inter)
545{
98fa08a5 546 u32 *reg_cache = inter->state->regs.gpr;
d16005f8
PC		 547 struct opcode_i *op = &inter->op->i;
548
549 if (likely(op->rt))
550 reg_cache[op->rt] = reg_cache[op->rs] < (u32)(s32)(s16)op->imm;
551
552 return jump_next(inter);
553}
554
555static u32 int_ANDI(struct interpreter *inter)
556{
98fa08a5 557 u32 *reg_cache = inter->state->regs.gpr;
d16005f8
PC		 558 struct opcode_i *op = &inter->op->i;
559
560 if (likely(op->rt))
561 reg_cache[op->rt] = reg_cache[op->rs] & op->imm;
562
563 return jump_next(inter);
564}
565
566static u32 int_ORI(struct interpreter *inter)
567{
98fa08a5 568 u32 *reg_cache = inter->state->regs.gpr;
d16005f8
PC		 569 struct opcode_i *op = &inter->op->i;
570
571 if (likely(op->rt))
572 reg_cache[op->rt] = reg_cache[op->rs] | op->imm;
573
574 return jump_next(inter);
575}
576
577static u32 int_XORI(struct interpreter *inter)
578{
98fa08a5 579 u32 *reg_cache = inter->state->regs.gpr;
d16005f8
PC		 580 struct opcode_i *op = &inter->op->i;
581
582 if (likely(op->rt))
583 reg_cache[op->rt] = reg_cache[op->rs] ^ op->imm;
584
585 return jump_next(inter);
586}
587
588static u32 int_LUI(struct interpreter *inter)
589{
590 struct opcode_i *op = &inter->op->i;
591
98fa08a5 592 inter->state->regs.gpr[op->rt] = op->imm << 16;
d16005f8
PC		 593
594 return jump_next(inter);
595}
596
597static u32 int_io(struct interpreter *inter, bool is_load)
598{
599 struct opcode_i *op = &inter->op->i;
98fa08a5 600 u32 *reg_cache = inter->state->regs.gpr;
cb72ea13
PC		 601 u32 val, *flags = NULL;
602
603 if (inter->block)
604 flags = &inter->op->flags;
d16005f8
PC		 605
606 val = lightrec_rw(inter->state, inter->op->c,
607 reg_cache[op->rs], reg_cache[op->rt],
cb72ea13 608 flags, inter->block, inter->offset);
d16005f8
PC		 609
610 if (is_load && op->rt)
611 reg_cache[op->rt] = val;
612
613 return jump_next(inter);
614}
615
616static u32 int_load(struct interpreter *inter)
617{
618 return int_io(inter, true);
619}
620
621static u32 int_store(struct interpreter *inter)
622{
623 u32 next_pc;
624
03535202 625 if (likely(!op_flag_smc(inter->op->flags)))
d16005f8
PC		 626 return int_io(inter, false);
627
628 lightrec_rw(inter->state, inter->op->c,
98fa08a5
PC		 629 inter->state->regs.gpr[inter->op->i.rs],
630 inter->state->regs.gpr[inter->op->i.rt],
cb72ea13 631 &inter->op->flags, inter->block, inter->offset);
d16005f8 632
98fa08a5 633 next_pc = int_get_ds_pc(inter, 1);
d16005f8
PC		 634
635 /* Invalidate next PC, to force the rest of the block to be rebuilt */
636 lightrec_invalidate(inter->state, next_pc, 4);
637
638 return next_pc;
639}
640
641static u32 int_LWC2(struct interpreter *inter)
642{
643 return int_io(inter, false);
644}
645
646static u32 int_special_SLL(struct interpreter *inter)
647{
648 struct opcode *op = inter->op;
649 u32 rt;
650
651 if (op->opcode) { /* Handle NOPs */
98fa08a5
PC		 652 rt = inter->state->regs.gpr[op->r.rt];
653 inter->state->regs.gpr[op->r.rd] = rt << op->r.imm;
d16005f8
PC		 654 }
655
656 return jump_next(inter);
657}
658
659static u32 int_special_SRL(struct interpreter *inter)
660{
661 struct opcode *op = inter->op;
98fa08a5 662 u32 rt = inter->state->regs.gpr[op->r.rt];
d16005f8 663
98fa08a5 664 inter->state->regs.gpr[op->r.rd] = rt >> op->r.imm;
d16005f8
PC		 665
666 return jump_next(inter);
667}
668
669static u32 int_special_SRA(struct interpreter *inter)
670{
671 struct opcode *op = inter->op;
98fa08a5 672 s32 rt = inter->state->regs.gpr[op->r.rt];
d16005f8 673
98fa08a5 674 inter->state->regs.gpr[op->r.rd] = rt >> op->r.imm;
d16005f8
PC		 675
676 return jump_next(inter);
677}
678
679static u32 int_special_SLLV(struct interpreter *inter)
680{
681 struct opcode *op = inter->op;
98fa08a5
PC		 682 u32 rs = inter->state->regs.gpr[op->r.rs];
683 u32 rt = inter->state->regs.gpr[op->r.rt];
d16005f8 684
98fa08a5 685 inter->state->regs.gpr[op->r.rd] = rt << (rs & 0x1f);
d16005f8
PC		 686
687 return jump_next(inter);
688}
689
690static u32 int_special_SRLV(struct interpreter *inter)
691{
692 struct opcode *op = inter->op;
98fa08a5
PC		 693 u32 rs = inter->state->regs.gpr[op->r.rs];
694 u32 rt = inter->state->regs.gpr[op->r.rt];
d16005f8 695
98fa08a5 696 inter->state->regs.gpr[op->r.rd] = rt >> (rs & 0x1f);
d16005f8
PC		 697
698 return jump_next(inter);
699}
700
701static u32 int_special_SRAV(struct interpreter *inter)
702{
703 struct opcode *op = inter->op;
98fa08a5
PC		 704 u32 rs = inter->state->regs.gpr[op->r.rs];
705 s32 rt = inter->state->regs.gpr[op->r.rt];
d16005f8 706
98fa08a5 707 inter->state->regs.gpr[op->r.rd] = rt >> (rs & 0x1f);
d16005f8
PC		 708
709 return jump_next(inter);
710}
711
712static u32 int_syscall_break(struct interpreter *inter)
713{
714
715 if (inter->op->r.op == OP_SPECIAL_BREAK)
cb72ea13 716 lightrec_set_exit_flags(inter->state, LIGHTREC_EXIT_BREAK);
d16005f8 717 else
cb72ea13 718 lightrec_set_exit_flags(inter->state, LIGHTREC_EXIT_SYSCALL);
d16005f8 719
98fa08a5 720 return int_get_ds_pc(inter, 0);
d16005f8
PC		 721}
722
723static u32 int_special_MFHI(struct interpreter *inter)
724{
98fa08a5 725 u32 *reg_cache = inter->state->regs.gpr;
d16005f8
PC		 726 struct opcode_r *op = &inter->op->r;
727
728 if (likely(op->rd))
729 reg_cache[op->rd] = reg_cache[REG_HI];
730
731 return jump_next(inter);
732}
733
734static u32 int_special_MTHI(struct interpreter *inter)
735{
98fa08a5 736 u32 *reg_cache = inter->state->regs.gpr;
d16005f8
PC		 737
738 reg_cache[REG_HI] = reg_cache[inter->op->r.rs];
739
740 return jump_next(inter);
741}
742
743static u32 int_special_MFLO(struct interpreter *inter)
744{
98fa08a5 745 u32 *reg_cache = inter->state->regs.gpr;
d16005f8
PC		 746 struct opcode_r *op = &inter->op->r;
747
748 if (likely(op->rd))
749 reg_cache[op->rd] = reg_cache[REG_LO];
750
751 return jump_next(inter);
752}
753
754static u32 int_special_MTLO(struct interpreter *inter)
755{
98fa08a5 756 u32 *reg_cache = inter->state->regs.gpr;
d16005f8
PC		 757
758 reg_cache[REG_LO] = reg_cache[inter->op->r.rs];
759
760 return jump_next(inter);
761}
762
763static u32 int_special_MULT(struct interpreter *inter)
764{
98fa08a5 765 u32 *reg_cache = inter->state->regs.gpr;
d16005f8
PC		 766 s32 rs = reg_cache[inter->op->r.rs];
767 s32 rt = reg_cache[inter->op->r.rt];
98fa08a5
PC		 768 u8 reg_lo = get_mult_div_lo(inter->op->c);
769 u8 reg_hi = get_mult_div_hi(inter->op->c);
d16005f8
PC		 770 u64 res = (s64)rs * (s64)rt;
771
03535202 772 if (!op_flag_no_hi(inter->op->flags))
98fa08a5 773 reg_cache[reg_hi] = res >> 32;
03535202 774 if (!op_flag_no_lo(inter->op->flags))
98fa08a5 775 reg_cache[reg_lo] = res;
d16005f8
PC		 776
777 return jump_next(inter);
778}
779
780static u32 int_special_MULTU(struct interpreter *inter)
781{
98fa08a5 782 u32 *reg_cache = inter->state->regs.gpr;
d16005f8
PC		 783 u32 rs = reg_cache[inter->op->r.rs];
784 u32 rt = reg_cache[inter->op->r.rt];
98fa08a5
PC		 785 u8 reg_lo = get_mult_div_lo(inter->op->c);
786 u8 reg_hi = get_mult_div_hi(inter->op->c);
d16005f8
PC		 787 u64 res = (u64)rs * (u64)rt;
788
03535202 789 if (!op_flag_no_hi(inter->op->flags))
98fa08a5 790 reg_cache[reg_hi] = res >> 32;
03535202 791 if (!op_flag_no_lo(inter->op->flags))
98fa08a5 792 reg_cache[reg_lo] = res;
d16005f8
PC		 793
794 return jump_next(inter);
795}
796
797static u32 int_special_DIV(struct interpreter *inter)
798{
98fa08a5 799 u32 *reg_cache = inter->state->regs.gpr;
d16005f8
PC		 800 s32 rs = reg_cache[inter->op->r.rs];
801 s32 rt = reg_cache[inter->op->r.rt];
98fa08a5
PC		 802 u8 reg_lo = get_mult_div_lo(inter->op->c);
803 u8 reg_hi = get_mult_div_hi(inter->op->c);
d16005f8
PC		 804 u32 lo, hi;
805
806 if (rt == 0) {
807 hi = rs;
808 lo = (rs < 0) * 2 - 1;
809 } else {
810 lo = rs / rt;
811 hi = rs % rt;
812 }
813
03535202 814 if (!op_flag_no_hi(inter->op->flags))
98fa08a5 815 reg_cache[reg_hi] = hi;
03535202 816 if (!op_flag_no_lo(inter->op->flags))
98fa08a5 817 reg_cache[reg_lo] = lo;
d16005f8
PC		 818
819 return jump_next(inter);
820}
821
822static u32 int_special_DIVU(struct interpreter *inter)
823{
98fa08a5 824 u32 *reg_cache = inter->state->regs.gpr;
d16005f8
PC		 825 u32 rs = reg_cache[inter->op->r.rs];
826 u32 rt = reg_cache[inter->op->r.rt];
98fa08a5
PC		 827 u8 reg_lo = get_mult_div_lo(inter->op->c);
828 u8 reg_hi = get_mult_div_hi(inter->op->c);
d16005f8
PC		 829 u32 lo, hi;
830
831 if (rt == 0) {
832 hi = rs;
833 lo = (u32)-1;
834 } else {
835 lo = rs / rt;
836 hi = rs % rt;
837 }
838
03535202 839 if (!op_flag_no_hi(inter->op->flags))
98fa08a5 840 reg_cache[reg_hi] = hi;
03535202 841 if (!op_flag_no_lo(inter->op->flags))
98fa08a5 842 reg_cache[reg_lo] = lo;
d16005f8
PC		 843
844 return jump_next(inter);
845}
846
847static u32 int_special_ADD(struct interpreter *inter)
848{
98fa08a5 849 u32 *reg_cache = inter->state->regs.gpr;
d16005f8
PC		 850 struct opcode_r *op = &inter->op->r;
851 s32 rs = reg_cache[op->rs];
852 s32 rt = reg_cache[op->rt];
853
854 if (likely(op->rd))
855 reg_cache[op->rd] = rs + rt;
856
857 return jump_next(inter);
858}
859
860static u32 int_special_SUB(struct interpreter *inter)
861{
98fa08a5 862 u32 *reg_cache = inter->state->regs.gpr;
d16005f8
PC		 863 struct opcode_r *op = &inter->op->r;
864 u32 rs = reg_cache[op->rs];
865 u32 rt = reg_cache[op->rt];
866
867 if (likely(op->rd))
868 reg_cache[op->rd] = rs - rt;
869
870 return jump_next(inter);
871}
872
873static u32 int_special_AND(struct interpreter *inter)
874{
98fa08a5 875 u32 *reg_cache = inter->state->regs.gpr;
d16005f8
PC		 876 struct opcode_r *op = &inter->op->r;
877 u32 rs = reg_cache[op->rs];
878 u32 rt = reg_cache[op->rt];
879
880 if (likely(op->rd))
881 reg_cache[op->rd] = rs & rt;
882
883 return jump_next(inter);
884}
885
886static u32 int_special_OR(struct interpreter *inter)
887{
98fa08a5 888 u32 *reg_cache = inter->state->regs.gpr;
d16005f8
PC		 889 struct opcode_r *op = &inter->op->r;
890 u32 rs = reg_cache[op->rs];
891 u32 rt = reg_cache[op->rt];
892
893 if (likely(op->rd))
894 reg_cache[op->rd] = rs | rt;
895
896 return jump_next(inter);
897}
898
899static u32 int_special_XOR(struct interpreter *inter)
900{
98fa08a5 901 u32 *reg_cache = inter->state->regs.gpr;
d16005f8
PC		 902 struct opcode_r *op = &inter->op->r;
903 u32 rs = reg_cache[op->rs];
904 u32 rt = reg_cache[op->rt];
905
906 if (likely(op->rd))
907 reg_cache[op->rd] = rs ^ rt;
908
909 return jump_next(inter);
910}
911
912static u32 int_special_NOR(struct interpreter *inter)
913{
98fa08a5 914 u32 *reg_cache = inter->state->regs.gpr;
d16005f8
PC		 915 struct opcode_r *op = &inter->op->r;
916 u32 rs = reg_cache[op->rs];
917 u32 rt = reg_cache[op->rt];
918
919 if (likely(op->rd))
920 reg_cache[op->rd] = ~(rs | rt);
921
922 return jump_next(inter);
923}
924
925static u32 int_special_SLT(struct interpreter *inter)
926{
98fa08a5 927 u32 *reg_cache = inter->state->regs.gpr;
d16005f8
PC		 928 struct opcode_r *op = &inter->op->r;
929 s32 rs = reg_cache[op->rs];
930 s32 rt = reg_cache[op->rt];
931
932 if (likely(op->rd))
933 reg_cache[op->rd] = rs < rt;
934
935 return jump_next(inter);
936}
937
938static u32 int_special_SLTU(struct interpreter *inter)
939{
98fa08a5 940 u32 *reg_cache = inter->state->regs.gpr;
d16005f8
PC		 941 struct opcode_r *op = &inter->op->r;
942 u32 rs = reg_cache[op->rs];
943 u32 rt = reg_cache[op->rt];
944
945 if (likely(op->rd))
946 reg_cache[op->rd] = rs < rt;
947
948 return jump_next(inter);
949}
950
d16005f8
PC		 951static u32 int_META_MOV(struct interpreter *inter)
952{
98fa08a5 953 u32 *reg_cache = inter->state->regs.gpr;
cb72ea13 954 struct opcode_m *op = &inter->op->m;
d16005f8
PC		 955
956 if (likely(op->rd))
957 reg_cache[op->rd] = reg_cache[op->rs];
958
959 return jump_next(inter);
960}
961
98fa08a5 962static u32 int_META_EXTC(struct interpreter *inter)
d16005f8 963{
98fa08a5 964 u32 *reg_cache = inter->state->regs.gpr;
cb72ea13 965 struct opcode_m *op = &inter->op->m;
d16005f8 966
cb72ea13
PC		 967 if (likely(op->rd))
968 reg_cache[op->rd] = (u32)(s32)(s8)reg_cache[op->rs];
98fa08a5
PC		 969
970 return jump_next(inter);
971}
972
973static u32 int_META_EXTS(struct interpreter *inter)
974{
975 u32 *reg_cache = inter->state->regs.gpr;
cb72ea13 976 struct opcode_m *op = &inter->op->m;
98fa08a5 977
cb72ea13
PC		 978 if (likely(op->rd))
979 reg_cache[op->rd] = (u32)(s32)(s16)reg_cache[op->rs];
98fa08a5
PC		 980
981 return jump_next(inter);
d16005f8
PC		 982}
983
ba3814c1
PC		 984static u32 int_META_MULT2(struct interpreter *inter)
985{
986 u32 *reg_cache = inter->state->regs.gpr;
987 union code c = inter->op->c;
988 u32 rs = reg_cache[c.r.rs];
989 u8 reg_lo = get_mult_div_lo(c);
990 u8 reg_hi = get_mult_div_hi(c);
991
992 if (!op_flag_no_lo(inter->op->flags)) {
993 if (c.r.op < 32)
994 reg_cache[reg_lo] = rs << c.r.op;
995 else
996 reg_cache[reg_lo] = 0;
997 }
998
999 if (!op_flag_no_hi(inter->op->flags)) {
f5ee77ca 1000 if (c.r.op >= 32) {
ba3814c1 1001 reg_cache[reg_hi] = rs << (c.r.op - 32);
f5ee77ca
PC		 1002 }
1003 else if (c.i.op == OP_META_MULT2) {
1004 if (c.r.op)
1005 reg_cache[reg_hi] = (s32) rs >> (32 - c.r.op);
1006 else
1007 reg_cache[reg_hi] = (s32) rs >> 31;
1008 } else {
1009 if (c.r.op)
1010 reg_cache[reg_hi] = rs >> (32 - c.r.op);
1011 else
1012 reg_cache[reg_hi] = 0;
1013 }
ba3814c1
PC		 1014 }
1015
1016 return jump_next(inter);
1017}
1018
cb72ea13
PC		 1019static u32 int_META_COM(struct interpreter *inter)
1020{
1021 u32 *reg_cache = inter->state->regs.gpr;
1022 union code c = inter->op->c;
1023
1024 if (likely(c.m.rd))
1025 reg_cache[c.m.rd] = ~reg_cache[c.m.rs];
1026
1027 return jump_next(inter);
1028}
1029
d16005f8 1030static const lightrec_int_func_t int_standard[64] = {
98fa08a5 1031 SET_DEFAULT_ELM(int_standard, int_unimplemented),
d16005f8
PC		 1032 [OP_SPECIAL] = int_SPECIAL,
1033 [OP_REGIMM] = int_REGIMM,
1034 [OP_J] = int_J,
1035 [OP_JAL] = int_JAL,
1036 [OP_BEQ] = int_BEQ,
1037 [OP_BNE] = int_BNE,
1038 [OP_BLEZ] = int_BLEZ,
1039 [OP_BGTZ] = int_BGTZ,
1040 [OP_ADDI] = int_ADDI,
1041 [OP_ADDIU] = int_ADDI,
1042 [OP_SLTI] = int_SLTI,
1043 [OP_SLTIU] = int_SLTIU,
1044 [OP_ANDI] = int_ANDI,
1045 [OP_ORI] = int_ORI,
1046 [OP_XORI] = int_XORI,
1047 [OP_LUI] = int_LUI,
1048 [OP_CP0] = int_CP0,
1049 [OP_CP2] = int_CP2,
1050 [OP_LB] = int_load,
1051 [OP_LH] = int_load,
1052 [OP_LWL] = int_load,
1053 [OP_LW] = int_load,
1054 [OP_LBU] = int_load,
1055 [OP_LHU] = int_load,
1056 [OP_LWR] = int_load,
1057 [OP_SB] = int_store,
1058 [OP_SH] = int_store,
1059 [OP_SWL] = int_store,
1060 [OP_SW] = int_store,
1061 [OP_SWR] = int_store,
1062 [OP_LWC2] = int_LWC2,
1063 [OP_SWC2] = int_store,
1064
cb72ea13 1065 [OP_META] = int_META,
ba3814c1
PC		 1066 [OP_META_MULT2] = int_META_MULT2,
1067 [OP_META_MULTU2] = int_META_MULT2,
d16005f8
PC		 1068};
1069
1070static const lightrec_int_func_t int_special[64] = {
98fa08a5 1071 SET_DEFAULT_ELM(int_special, int_unimplemented),
d16005f8
PC		 1072 [OP_SPECIAL_SLL] = int_special_SLL,
1073 [OP_SPECIAL_SRL] = int_special_SRL,
1074 [OP_SPECIAL_SRA] = int_special_SRA,
1075 [OP_SPECIAL_SLLV] = int_special_SLLV,
1076 [OP_SPECIAL_SRLV] = int_special_SRLV,
1077 [OP_SPECIAL_SRAV] = int_special_SRAV,
1078 [OP_SPECIAL_JR] = int_special_JR,
1079 [OP_SPECIAL_JALR] = int_special_JALR,
1080 [OP_SPECIAL_SYSCALL] = int_syscall_break,
1081 [OP_SPECIAL_BREAK] = int_syscall_break,
1082 [OP_SPECIAL_MFHI] = int_special_MFHI,
1083 [OP_SPECIAL_MTHI] = int_special_MTHI,
1084 [OP_SPECIAL_MFLO] = int_special_MFLO,
1085 [OP_SPECIAL_MTLO] = int_special_MTLO,
1086 [OP_SPECIAL_MULT] = int_special_MULT,
1087 [OP_SPECIAL_MULTU] = int_special_MULTU,
1088 [OP_SPECIAL_DIV] = int_special_DIV,
1089 [OP_SPECIAL_DIVU] = int_special_DIVU,
1090 [OP_SPECIAL_ADD] = int_special_ADD,
1091 [OP_SPECIAL_ADDU] = int_special_ADD,
1092 [OP_SPECIAL_SUB] = int_special_SUB,
1093 [OP_SPECIAL_SUBU] = int_special_SUB,
1094 [OP_SPECIAL_AND] = int_special_AND,
1095 [OP_SPECIAL_OR] = int_special_OR,
1096 [OP_SPECIAL_XOR] = int_special_XOR,
1097 [OP_SPECIAL_NOR] = int_special_NOR,
1098 [OP_SPECIAL_SLT] = int_special_SLT,
1099 [OP_SPECIAL_SLTU] = int_special_SLTU,
1100};
1101
1102static const lightrec_int_func_t int_regimm[64] = {
98fa08a5 1103 SET_DEFAULT_ELM(int_regimm, int_unimplemented),
d16005f8
PC		 1104 [OP_REGIMM_BLTZ] = int_regimm_BLTZ,
1105 [OP_REGIMM_BGEZ] = int_regimm_BGEZ,
1106 [OP_REGIMM_BLTZAL] = int_regimm_BLTZAL,
1107 [OP_REGIMM_BGEZAL] = int_regimm_BGEZAL,
1108};
1109
1110static const lightrec_int_func_t int_cp0[64] = {
98fa08a5 1111 SET_DEFAULT_ELM(int_cp0, int_CP),
d16005f8
PC		 1112 [OP_CP0_MFC0] = int_cfc,
1113 [OP_CP0_CFC0] = int_cfc,
1114 [OP_CP0_MTC0] = int_ctc,
1115 [OP_CP0_CTC0] = int_ctc,
1116 [OP_CP0_RFE] = int_cp0_RFE,
1117};
1118
1119static const lightrec_int_func_t int_cp2_basic[64] = {
98fa08a5 1120 SET_DEFAULT_ELM(int_cp2_basic, int_CP),
d16005f8
PC		 1121 [OP_CP2_BASIC_MFC2] = int_cfc,
1122 [OP_CP2_BASIC_CFC2] = int_cfc,
1123 [OP_CP2_BASIC_MTC2] = int_ctc,
1124 [OP_CP2_BASIC_CTC2] = int_ctc,
1125};
1126
cb72ea13
PC		 1127static const lightrec_int_func_t int_meta[64] = {
1128 SET_DEFAULT_ELM(int_meta, int_unimplemented),
1129 [OP_META_MOV] = int_META_MOV,
1130 [OP_META_EXTC] = int_META_EXTC,
1131 [OP_META_EXTS] = int_META_EXTS,
1132 [OP_META_COM] = int_META_COM,
1133};
1134
d16005f8
PC		 1135static u32 int_SPECIAL(struct interpreter *inter)
1136{
1137 lightrec_int_func_t f = int_special[inter->op->r.op];
98fa08a5
PC		 1138
1139 if (!HAS_DEFAULT_ELM && unlikely(!f))
d16005f8 1140 return int_unimplemented(inter);
98fa08a5
PC		 1141
1142 return execute(f, inter);
d16005f8
PC		 1143}
1144
1145static u32 int_REGIMM(struct interpreter *inter)
1146{
1147 lightrec_int_func_t f = int_regimm[inter->op->r.rt];
98fa08a5
PC		 1148
1149 if (!HAS_DEFAULT_ELM && unlikely(!f))
d16005f8 1150 return int_unimplemented(inter);
98fa08a5
PC		 1151
1152 return execute(f, inter);
d16005f8
PC		 1153}
1154
1155static u32 int_CP0(struct interpreter *inter)
1156{
1157 lightrec_int_func_t f = int_cp0[inter->op->r.rs];
98fa08a5
PC		 1158
1159 if (!HAS_DEFAULT_ELM && unlikely(!f))
d16005f8 1160 return int_CP(inter);
98fa08a5
PC		 1161
1162 return execute(f, inter);
d16005f8
PC		 1163}
1164
1165static u32 int_CP2(struct interpreter *inter)
1166{
1167 if (inter->op->r.op == OP_CP2_BASIC) {
1168 lightrec_int_func_t f = int_cp2_basic[inter->op->r.rs];
98fa08a5 1169 if (HAS_DEFAULT_ELM || likely(f))
d16005f8
PC		 1170 return execute(f, inter);
1171 }
1172
1173 return int_CP(inter);
1174}
1175
cb72ea13
PC		 1176static u32 int_META(struct interpreter *inter)
1177{
1178 lightrec_int_func_t f = int_meta[inter->op->m.op];
1179
1180 if (!HAS_DEFAULT_ELM && unlikely(!f))
1181 return int_unimplemented(inter);
1182
1183 return execute(f, inter);
1184}
1185
98fa08a5
PC		 1186static u32 lightrec_emulate_block_list(struct lightrec_state *state,
1187 struct block *block, u32 offset)
d16005f8
PC		 1188{
1189 struct interpreter inter;
1190 u32 pc;
1191
1192 inter.block = block;
98fa08a5
PC		 1193 inter.state = state;
1194 inter.offset = offset;
1195 inter.op = &block->opcode_list[offset];
d16005f8
PC		 1196 inter.cycles = 0;
1197 inter.delay_slot = false;
1198
1199 pc = lightrec_int_op(&inter);
1200
1201 /* Add the cycles of the last branch */
684432ad 1202 inter.cycles += lightrec_cycles_of_opcode(inter.state, inter.op->c);
d16005f8 1203
98fa08a5 1204 state->current_cycle += inter.cycles;
d16005f8
PC		 1205
1206 return pc;
1207}
1208
98fa08a5 1209u32 lightrec_emulate_block(struct lightrec_state *state, struct block *block, u32 pc)
d16005f8
PC		 1210{
1211 u32 offset = (kunseg(pc) - kunseg(block->pc)) >> 2;
d16005f8 1212
98fa08a5
PC		 1213 if (offset < block->nb_ops)
1214 return lightrec_emulate_block_list(state, block, offset);
d16005f8 1215
f5ee77ca 1216 pr_err(PC_FMT" is outside block at "PC_FMT"\n", pc, block->pc);
d16005f8 1217
ba3814c1
PC		 1218 lightrec_set_exit_flags(state, LIGHTREC_EXIT_SEGFAULT);
1219
d16005f8
PC		 1220 return 0;
1221}
cb72ea13
PC		 1222
1223static u32 branch_get_next_pc(struct lightrec_state *state, union code c, u32 pc)
1224{
1225 switch (c.i.op) {
1226 case OP_SPECIAL:
1227 /* JR / JALR */
1228 return state->regs.gpr[c.r.rs];
1229 case OP_J:
1230 case OP_JAL:
1231 return (pc & 0xf0000000) | (c.j.imm << 2);
1232 default:
1233 /* Branch opcodes */
1234 return pc + 4 + ((s16)c.i.imm << 2);
1235 }
1236}
1237
1238u32 lightrec_handle_load_delay(struct lightrec_state *state,
1239 struct block *block, u32 pc, u32 reg)
1240{
1241 union code c = lightrec_read_opcode(state, pc);
1242 struct opcode op[2] = {
1243 {
1244 .c = c,
1245 .flags = 0,
1246 },
1247 {
1248 .flags = 0,
1249 },
1250 };
1251 struct interpreter inter = {
1252 .block = block,
1253 .state = state,
1254 .offset = 0,
1255 .op = op,
1256 .cycles = 0,
1257 };
1258 bool branch_taken;
1259 u32 reg_mask, next_pc;
1260
1261 if (has_delay_slot(c)) {
1262 op[1].c = lightrec_read_opcode(state, pc + 4);
1263
1264 branch_taken = is_branch_taken(state->regs.gpr, c);
1265 next_pc = branch_get_next_pc(state, c, pc);
1266
1267 /* Branch was evaluated, we can write the load opcode's target
1268 * register now. */
1269 state->regs.gpr[reg] = state->temp_reg;
1270
1271 /* Handle JALR / regimm opcodes setting $ra (or any other
1272 * register in the case of JALR) */
1273 reg_mask = (u32)opcode_write_mask(c);
1274 if (reg_mask)
1275 state->regs.gpr[ctz32(reg_mask)] = pc + 8;
1276
1277 /* Handle delay slot of the branch opcode */
1278 pc = int_delay_slot(&inter, next_pc, branch_taken);
1279 } else {
1280 /* Make sure we only run one instruction */
1281 inter.delay_slot = true;
1282
1283 lightrec_int_op(&inter);
1284 pc += 4;
1285
1286 if (!opcode_writes_register(c, reg))
1287 state->regs.gpr[reg] = state->temp_reg;
1288 }
1289
1290 state->current_cycle += inter.cycles;
1291
1292 return pc;
1293}
ARM optimized PCSX fork