spu: get rid of iXAPitch
[pcsx_rearmed.git] / deps / lightrec / lightrec.c
1 // SPDX-License-Identifier: LGPL-2.1-or-later
2 /*
3  * Copyright (C) 2014-2021 Paul Cercueil <paul@crapouillou.net>
4  */
5
6 #include "blockcache.h"
7 #include "debug.h"
8 #include "disassembler.h"
9 #include "emitter.h"
10 #include "interpreter.h"
11 #include "lightrec-config.h"
12 #include "lightning-wrapper.h"
13 #include "lightrec.h"
14 #include "memmanager.h"
15 #include "reaper.h"
16 #include "recompiler.h"
17 #include "regcache.h"
18 #include "optimizer.h"
19 #include "tlsf/tlsf.h"
20
21 #include <errno.h>
22 #include <inttypes.h>
23 #include <limits.h>
24 #if ENABLE_THREADED_COMPILER
25 #include <stdatomic.h>
26 #endif
27 #include <stdbool.h>
28 #include <stddef.h>
29 #include <string.h>
30
31 #define GENMASK(h, l) \
32         (((uintptr_t)-1 << (l)) & ((uintptr_t)-1 >> (__WORDSIZE - 1 - (h))))
33
34 static struct block * lightrec_precompile_block(struct lightrec_state *state,
35                                                 u32 pc);
36 static bool lightrec_block_is_fully_tagged(const struct block *block);
37
38 static void lightrec_mtc2(struct lightrec_state *state, u8 reg, u32 data);
39 static u32 lightrec_mfc2(struct lightrec_state *state, u8 reg);
40
41 static void lightrec_default_sb(struct lightrec_state *state, u32 opcode,
42                                 void *host, u32 addr, u8 data)
43 {
44         *(u8 *)host = data;
45
46         if (!state->invalidate_from_dma_only)
47                 lightrec_invalidate(state, addr, 1);
48 }
49
50 static void lightrec_default_sh(struct lightrec_state *state, u32 opcode,
51                                 void *host, u32 addr, u16 data)
52 {
53         *(u16 *)host = HTOLE16(data);
54
55         if (!state->invalidate_from_dma_only)
56                 lightrec_invalidate(state, addr, 2);
57 }
58
59 static void lightrec_default_sw(struct lightrec_state *state, u32 opcode,
60                                 void *host, u32 addr, u32 data)
61 {
62         *(u32 *)host = HTOLE32(data);
63
64         if (!state->invalidate_from_dma_only)
65                 lightrec_invalidate(state, addr, 4);
66 }
67
68 static u8 lightrec_default_lb(struct lightrec_state *state,
69                               u32 opcode, void *host, u32 addr)
70 {
71         return *(u8 *)host;
72 }
73
74 static u16 lightrec_default_lh(struct lightrec_state *state,
75                                u32 opcode, void *host, u32 addr)
76 {
77         return LE16TOH(*(u16 *)host);
78 }
79
80 static u32 lightrec_default_lw(struct lightrec_state *state,
81                                u32 opcode, void *host, u32 addr)
82 {
83         return LE32TOH(*(u32 *)host);
84 }
85
86 static const struct lightrec_mem_map_ops lightrec_default_ops = {
87         .sb = lightrec_default_sb,
88         .sh = lightrec_default_sh,
89         .sw = lightrec_default_sw,
90         .lb = lightrec_default_lb,
91         .lh = lightrec_default_lh,
92         .lw = lightrec_default_lw,
93 };
94
95 static void __segfault_cb(struct lightrec_state *state, u32 addr,
96                           const struct block *block)
97 {
98         lightrec_set_exit_flags(state, LIGHTREC_EXIT_SEGFAULT);
99         pr_err("Segmentation fault in recompiled code: invalid "
100                "load/store at address 0x%08x\n", addr);
101         if (block)
102                 pr_err("Was executing block PC 0x%08x\n", block->pc);
103 }
104
105 static void lightrec_swl(struct lightrec_state *state,
106                          const struct lightrec_mem_map_ops *ops,
107                          u32 opcode, void *host, u32 addr, u32 data)
108 {
109         unsigned int shift = addr & 0x3;
110         unsigned int mask = GENMASK(31, (shift + 1) * 8);
111         u32 old_data;
112
113         /* Align to 32 bits */
114         addr &= ~3;
115         host = (void *)((uintptr_t)host & ~3);
116
117         old_data = ops->lw(state, opcode, host, addr);
118
119         data = (data >> ((3 - shift) * 8)) | (old_data & mask);
120
121         ops->sw(state, opcode, host, addr, data);
122 }
123
124 static void lightrec_swr(struct lightrec_state *state,
125                          const struct lightrec_mem_map_ops *ops,
126                          u32 opcode, void *host, u32 addr, u32 data)
127 {
128         unsigned int shift = addr & 0x3;
129         unsigned int mask = (1 << (shift * 8)) - 1;
130         u32 old_data;
131
132         /* Align to 32 bits */
133         addr &= ~3;
134         host = (void *)((uintptr_t)host & ~3);
135
136         old_data = ops->lw(state, opcode, host, addr);
137
138         data = (data << (shift * 8)) | (old_data & mask);
139
140         ops->sw(state, opcode, host, addr, data);
141 }
142
143 static void lightrec_swc2(struct lightrec_state *state, union code op,
144                           const struct lightrec_mem_map_ops *ops,
145                           void *host, u32 addr)
146 {
147         u32 data = lightrec_mfc2(state, op.i.rt);
148
149         ops->sw(state, op.opcode, host, addr, data);
150 }
151
152 static u32 lightrec_lwl(struct lightrec_state *state,
153                         const struct lightrec_mem_map_ops *ops,
154                         u32 opcode, void *host, u32 addr, u32 data)
155 {
156         unsigned int shift = addr & 0x3;
157         unsigned int mask = (1 << (24 - shift * 8)) - 1;
158         u32 old_data;
159
160         /* Align to 32 bits */
161         addr &= ~3;
162         host = (void *)((uintptr_t)host & ~3);
163
164         old_data = ops->lw(state, opcode, host, addr);
165
166         return (data & mask) | (old_data << (24 - shift * 8));
167 }
168
169 static u32 lightrec_lwr(struct lightrec_state *state,
170                         const struct lightrec_mem_map_ops *ops,
171                         u32 opcode, void *host, u32 addr, u32 data)
172 {
173         unsigned int shift = addr & 0x3;
174         unsigned int mask = GENMASK(31, 32 - shift * 8);
175         u32 old_data;
176
177         /* Align to 32 bits */
178         addr &= ~3;
179         host = (void *)((uintptr_t)host & ~3);
180
181         old_data = ops->lw(state, opcode, host, addr);
182
183         return (data & mask) | (old_data >> (shift * 8));
184 }
185
186 static void lightrec_lwc2(struct lightrec_state *state, union code op,
187                           const struct lightrec_mem_map_ops *ops,
188                           void *host, u32 addr)
189 {
190         u32 data = ops->lw(state, op.opcode, host, addr);
191
192         lightrec_mtc2(state, op.i.rt, data);
193 }
194
195 static void lightrec_invalidate_map(struct lightrec_state *state,
196                 const struct lightrec_mem_map *map, u32 addr, u32 len)
197 {
198         if (map == &state->maps[PSX_MAP_KERNEL_USER_RAM]) {
199                 memset(lut_address(state, lut_offset(addr)), 0,
200                        ((len + 3) / 4) * lut_elm_size(state));
201         }
202 }
203
204 enum psx_map
205 lightrec_get_map_idx(struct lightrec_state *state, u32 kaddr)
206 {
207         const struct lightrec_mem_map *map;
208         unsigned int i;
209
210         for (i = 0; i < state->nb_maps; i++) {
211                 map = &state->maps[i];
212
213                 if (kaddr >= map->pc && kaddr < map->pc + map->length)
214                         return (enum psx_map) i;
215         }
216
217         return PSX_MAP_UNKNOWN;
218 }
219
220 const struct lightrec_mem_map *
221 lightrec_get_map(struct lightrec_state *state, void **host, u32 kaddr)
222 {
223         const struct lightrec_mem_map *map;
224         enum psx_map idx;
225         u32 addr;
226
227         idx = lightrec_get_map_idx(state, kaddr);
228         if (idx == PSX_MAP_UNKNOWN)
229                 return NULL;
230
231         map = &state->maps[idx];
232         addr = kaddr - map->pc;
233
234         while (map->mirror_of)
235                 map = map->mirror_of;
236
237         if (host)
238                 *host = map->address + addr;
239
240         return map;
241 }
242
243 u32 lightrec_rw(struct lightrec_state *state, union code op,
244                 u32 addr, u32 data, u32 *flags, struct block *block)
245 {
246         const struct lightrec_mem_map *map;
247         const struct lightrec_mem_map_ops *ops;
248         u32 opcode = op.opcode;
249         void *host;
250
251         addr += (s16) op.i.imm;
252
253         map = lightrec_get_map(state, &host, kunseg(addr));
254         if (!map) {
255                 __segfault_cb(state, addr, block);
256                 return 0;
257         }
258
259         if (unlikely(map->ops)) {
260                 if (flags && !LIGHTREC_FLAGS_GET_IO_MODE(*flags))
261                         *flags |= LIGHTREC_IO_MODE(LIGHTREC_IO_HW);
262
263                 ops = map->ops;
264         } else {
265                 if (flags && !LIGHTREC_FLAGS_GET_IO_MODE(*flags))
266                         *flags |= LIGHTREC_IO_MODE(LIGHTREC_IO_DIRECT);
267
268                 ops = &lightrec_default_ops;
269         }
270
271         switch (op.i.op) {
272         case OP_SB:
273                 ops->sb(state, opcode, host, addr, (u8) data);
274                 return 0;
275         case OP_SH:
276                 ops->sh(state, opcode, host, addr, (u16) data);
277                 return 0;
278         case OP_SWL:
279                 lightrec_swl(state, ops, opcode, host, addr, data);
280                 return 0;
281         case OP_SWR:
282                 lightrec_swr(state, ops, opcode, host, addr, data);
283                 return 0;
284         case OP_SW:
285                 ops->sw(state, opcode, host, addr, data);
286                 return 0;
287         case OP_SWC2:
288                 lightrec_swc2(state, op, ops, host, addr);
289                 return 0;
290         case OP_LB:
291                 return (s32) (s8) ops->lb(state, opcode, host, addr);
292         case OP_LBU:
293                 return ops->lb(state, opcode, host, addr);
294         case OP_LH:
295                 return (s32) (s16) ops->lh(state, opcode, host, addr);
296         case OP_LHU:
297                 return ops->lh(state, opcode, host, addr);
298         case OP_LWC2:
299                 lightrec_lwc2(state, op, ops, host, addr);
300                 return 0;
301         case OP_LWL:
302                 return lightrec_lwl(state, ops, opcode, host, addr, data);
303         case OP_LWR:
304                 return lightrec_lwr(state, ops, opcode, host, addr, data);
305         case OP_LW:
306         default:
307                 return ops->lw(state, opcode, host, addr);
308         }
309 }
310
311 static void lightrec_rw_helper(struct lightrec_state *state,
312                                union code op, u32 *flags,
313                                struct block *block)
314 {
315         u32 ret = lightrec_rw(state, op, state->regs.gpr[op.i.rs],
316                               state->regs.gpr[op.i.rt], flags, block);
317
318         switch (op.i.op) {
319         case OP_LB:
320         case OP_LBU:
321         case OP_LH:
322         case OP_LHU:
323         case OP_LWL:
324         case OP_LWR:
325         case OP_LW:
326                 if (op.i.rt)
327                         state->regs.gpr[op.i.rt] = ret;
328                 fallthrough;
329         default:
330                 break;
331         }
332 }
333
334 static void lightrec_rw_cb(struct lightrec_state *state, u32 arg)
335 {
336         lightrec_rw_helper(state, (union code) arg, NULL, NULL);
337 }
338
339 static void lightrec_rw_generic_cb(struct lightrec_state *state, u32 arg)
340 {
341         struct block *block;
342         struct opcode *op;
343         bool was_tagged;
344         u16 offset = (u16)arg;
345
346         block = lightrec_find_block_from_lut(state->block_cache,
347                                              arg >> 16, state->next_pc);
348         if (unlikely(!block)) {
349                 pr_err("rw_generic: No block found in LUT for PC 0x%x offset 0x%x\n",
350                          state->next_pc, offset);
351                 return;
352         }
353
354         op = &block->opcode_list[offset];
355         was_tagged = LIGHTREC_FLAGS_GET_IO_MODE(op->flags);
356
357         lightrec_rw_helper(state, op->c, &op->flags, block);
358
359         if (!was_tagged) {
360                 pr_debug("Opcode of block at PC 0x%08x has been tagged - flag "
361                          "for recompilation\n", block->pc);
362
363                 block->flags |= BLOCK_SHOULD_RECOMPILE;
364                 lut_write(state, lut_offset(block->pc), NULL);
365         }
366 }
367
368 static u32 clamp_s32(s32 val, s32 min, s32 max)
369 {
370         return val < min ? min : val > max ? max : val;
371 }
372
373 static u16 load_u16(u32 *ptr)
374 {
375         return ((struct u16x2 *) ptr)->l;
376 }
377
378 static void store_u16(u32 *ptr, u16 value)
379 {
380         ((struct u16x2 *) ptr)->l = value;
381 }
382
383 static u32 lightrec_mfc2(struct lightrec_state *state, u8 reg)
384 {
385         s16 gteir1, gteir2, gteir3;
386
387         switch (reg) {
388         case 1:
389         case 3:
390         case 5:
391         case 8:
392         case 9:
393         case 10:
394         case 11:
395                 return (s32)(s16) load_u16(&state->regs.cp2d[reg]);
396         case 7:
397         case 16:
398         case 17:
399         case 18:
400         case 19:
401                 return load_u16(&state->regs.cp2d[reg]);
402         case 28:
403         case 29:
404                 gteir1 = (s16) load_u16(&state->regs.cp2d[9]);
405                 gteir2 = (s16) load_u16(&state->regs.cp2d[10]);
406                 gteir3 = (s16) load_u16(&state->regs.cp2d[11]);
407
408                 return clamp_s32(gteir1 >> 7, 0, 0x1f) << 0 |
409                         clamp_s32(gteir2 >> 7, 0, 0x1f) << 5 |
410                         clamp_s32(gteir3 >> 7, 0, 0x1f) << 10;
411         case 15:
412                 reg = 14;
413                 fallthrough;
414         default:
415                 return state->regs.cp2d[reg];
416         }
417 }
418
419 u32 lightrec_mfc(struct lightrec_state *state, union code op)
420 {
421         if (op.i.op == OP_CP0)
422                 return state->regs.cp0[op.r.rd];
423         else if (op.r.rs == OP_CP2_BASIC_MFC2)
424                 return lightrec_mfc2(state, op.r.rd);
425         else
426                 return state->regs.cp2c[op.r.rd];
427 }
428
429 static void lightrec_mtc0(struct lightrec_state *state, u8 reg, u32 data)
430 {
431         u32 status, oldstatus, cause;
432
433         switch (reg) {
434         case 1:
435         case 4:
436         case 8:
437         case 14:
438         case 15:
439                 /* Those registers are read-only */
440                 return;
441         default:
442                 break;
443         }
444
445         if (reg == 12) {
446                 status = state->regs.cp0[12];
447                 oldstatus = status;
448
449                 if (status & ~data & BIT(16)) {
450                         state->ops.enable_ram(state, true);
451                         lightrec_invalidate_all(state);
452                 } else if (~status & data & BIT(16)) {
453                         state->ops.enable_ram(state, false);
454                 }
455         }
456
457         if (reg == 13) {
458                 state->regs.cp0[13] &= ~0x300;
459                 state->regs.cp0[13] |= data & 0x300;
460         } else {
461                 state->regs.cp0[reg] = data;
462         }
463
464         if (reg == 12 || reg == 13) {
465                 cause = state->regs.cp0[13];
466                 status = state->regs.cp0[12];
467
468                 /* Handle software interrupts */
469                 if (!!(status & cause & 0x300) & status)
470                         lightrec_set_exit_flags(state, LIGHTREC_EXIT_CHECK_INTERRUPT);
471
472                 /* Handle hardware interrupts */
473                 if (reg == 12 && !(~status & 0x401) && (~oldstatus & 0x401))
474                         lightrec_set_exit_flags(state, LIGHTREC_EXIT_CHECK_INTERRUPT);
475         }
476 }
477
478 static u32 count_leading_bits(s32 data)
479 {
480         u32 cnt = 33;
481
482 #ifdef __has_builtin
483 #if __has_builtin(__builtin_clrsb)
484         return 1 + __builtin_clrsb(data);
485 #endif
486 #endif
487
488         data = (data ^ (data >> 31)) << 1;
489
490         do {
491                 cnt -= 1;
492                 data >>= 1;
493         } while (data);
494
495         return cnt;
496 }
497
498 static void lightrec_mtc2(struct lightrec_state *state, u8 reg, u32 data)
499 {
500         switch (reg) {
501         case 15:
502                 state->regs.cp2d[12] = state->regs.cp2d[13];
503                 state->regs.cp2d[13] = state->regs.cp2d[14];
504                 state->regs.cp2d[14] = data;
505                 break;
506         case 28:
507                 state->regs.cp2d[9] = (data << 7) & 0xf80;
508                 state->regs.cp2d[10] = (data << 2) & 0xf80;
509                 state->regs.cp2d[11] = (data >> 3) & 0xf80;
510                 break;
511         case 31:
512                 return;
513         case 30:
514                 state->regs.cp2d[31] = count_leading_bits((s32) data);
515                 fallthrough;
516         default:
517                 state->regs.cp2d[reg] = data;
518                 break;
519         }
520 }
521
522 static void lightrec_ctc2(struct lightrec_state *state, u8 reg, u32 data)
523 {
524         switch (reg) {
525         case 4:
526         case 12:
527         case 20:
528         case 26:
529         case 27:
530         case 29:
531         case 30:
532                 store_u16(&state->regs.cp2c[reg], data);
533                 break;
534         case 31:
535                 data = (data & 0x7ffff000) | !!(data & 0x7f87e000) << 31;
536                 fallthrough;
537         default:
538                 state->regs.cp2c[reg] = data;
539                 break;
540         }
541 }
542
543 void lightrec_mtc(struct lightrec_state *state, union code op, u32 data)
544 {
545         if (op.i.op == OP_CP0)
546                 lightrec_mtc0(state, op.r.rd, data);
547         else if (op.r.rs == OP_CP2_BASIC_CTC2)
548                 lightrec_ctc2(state, op.r.rd, data);
549         else
550                 lightrec_mtc2(state, op.r.rd, data);
551 }
552
553 static void lightrec_mtc_cb(struct lightrec_state *state, u32 arg)
554 {
555         union code op = (union code) arg;
556
557         lightrec_mtc(state, op, state->regs.gpr[op.r.rt]);
558 }
559
560 void lightrec_rfe(struct lightrec_state *state)
561 {
562         u32 status;
563
564         /* Read CP0 Status register (r12) */
565         status = state->regs.cp0[12];
566
567         /* Switch the bits */
568         status = ((status & 0x3c) >> 2) | (status & ~0xf);
569
570         /* Write it back */
571         lightrec_mtc0(state, 12, status);
572 }
573
574 void lightrec_cp(struct lightrec_state *state, union code op)
575 {
576         if (op.i.op == OP_CP0) {
577                 pr_err("Invalid CP opcode to coprocessor #0\n");
578                 return;
579         }
580
581         (*state->ops.cop2_op)(state, op.opcode);
582 }
583
584 static void lightrec_cp_cb(struct lightrec_state *state, u32 arg)
585 {
586         lightrec_cp(state, (union code) arg);
587 }
588
589 static void lightrec_syscall_cb(struct lightrec_state *state)
590 {
591         lightrec_set_exit_flags(state, LIGHTREC_EXIT_SYSCALL);
592 }
593
594 static void lightrec_break_cb(struct lightrec_state *state)
595 {
596         lightrec_set_exit_flags(state, LIGHTREC_EXIT_BREAK);
597 }
598
599 static struct block * lightrec_get_block(struct lightrec_state *state, u32 pc)
600 {
601         struct block *block = lightrec_find_block(state->block_cache, pc);
602
603         if (block && lightrec_block_is_outdated(state, block)) {
604                 pr_debug("Block at PC 0x%08x is outdated!\n", block->pc);
605
606                 /* Make sure the recompiler isn't processing the block we'll
607                  * destroy */
608                 if (ENABLE_THREADED_COMPILER)
609                         lightrec_recompiler_remove(state->rec, block);
610
611                 lightrec_unregister_block(state->block_cache, block);
612                 remove_from_code_lut(state->block_cache, block);
613                 lightrec_free_block(state, block);
614                 block = NULL;
615         }
616
617         if (!block) {
618                 block = lightrec_precompile_block(state, pc);
619                 if (!block) {
620                         pr_err("Unable to recompile block at PC 0x%x\n", pc);
621                         lightrec_set_exit_flags(state, LIGHTREC_EXIT_SEGFAULT);
622                         return NULL;
623                 }
624
625                 lightrec_register_block(state->block_cache, block);
626         }
627
628         return block;
629 }
630
631 static void * get_next_block_func(struct lightrec_state *state, u32 pc)
632 {
633         struct block *block;
634         bool should_recompile;
635         void *func;
636         int err;
637
638         for (;;) {
639                 func = lut_read(state, lut_offset(pc));
640                 if (func && func != state->get_next_block)
641                         break;
642
643                 block = lightrec_get_block(state, pc);
644
645                 if (unlikely(!block))
646                         break;
647
648                 if (OPT_REPLACE_MEMSET && (block->flags & BLOCK_IS_MEMSET)) {
649                         func = state->memset_func;
650                         break;
651                 }
652
653                 should_recompile = block->flags & BLOCK_SHOULD_RECOMPILE &&
654                         !(block->flags & BLOCK_IS_DEAD);
655
656                 if (unlikely(should_recompile)) {
657                         pr_debug("Block at PC 0x%08x should recompile\n", pc);
658
659                         lightrec_unregister(MEM_FOR_CODE, block->code_size);
660
661                         if (ENABLE_THREADED_COMPILER) {
662                                 lightrec_recompiler_add(state->rec, block);
663                         } else {
664                                 err = lightrec_compile_block(state->cstate, block);
665                                 if (err) {
666                                         state->exit_flags = LIGHTREC_EXIT_NOMEM;
667                                         return NULL;
668                                 }
669                         }
670                 }
671
672                 if (ENABLE_THREADED_COMPILER && likely(!should_recompile))
673                         func = lightrec_recompiler_run_first_pass(state, block, &pc);
674                 else
675                         func = block->function;
676
677                 if (likely(func))
678                         break;
679
680                 if (unlikely(block->flags & BLOCK_NEVER_COMPILE)) {
681                         pc = lightrec_emulate_block(state, block, pc);
682
683                 } else if (!ENABLE_THREADED_COMPILER) {
684                         /* Block wasn't compiled yet - run the interpreter */
685                         if (block->flags & BLOCK_FULLY_TAGGED)
686                                 pr_debug("Block fully tagged, skipping first pass\n");
687                         else if (ENABLE_FIRST_PASS && likely(!should_recompile))
688                                 pc = lightrec_emulate_block(state, block, pc);
689
690                         /* Then compile it using the profiled data */
691                         err = lightrec_compile_block(state->cstate, block);
692                         if (err) {
693                                 state->exit_flags = LIGHTREC_EXIT_NOMEM;
694                                 return NULL;
695                         }
696                 } else {
697                         lightrec_recompiler_add(state->rec, block);
698                 }
699
700                 if (state->exit_flags != LIGHTREC_EXIT_NORMAL ||
701                     state->current_cycle >= state->target_cycle)
702                         break;
703         }
704
705         state->next_pc = pc;
706         return func;
707 }
708
709 static s32 c_function_wrapper(struct lightrec_state *state, s32 cycles_delta,
710                               void (*f)(struct lightrec_state *, u32), u32 arg)
711 {
712         state->current_cycle = state->target_cycle - cycles_delta;
713
714         (*f)(state, arg);
715
716         return state->target_cycle - state->current_cycle;
717 }
718
719 static void * lightrec_alloc_code(struct lightrec_state *state, size_t size)
720 {
721         void *code;
722
723         if (ENABLE_THREADED_COMPILER)
724                 lightrec_code_alloc_lock(state);
725
726         code = tlsf_malloc(state->tlsf, size);
727
728         if (ENABLE_THREADED_COMPILER)
729                 lightrec_code_alloc_unlock(state);
730
731         return code;
732 }
733
734 static void lightrec_realloc_code(struct lightrec_state *state,
735                                   void *ptr, size_t size)
736 {
737         /* NOTE: 'size' MUST be smaller than the size specified during
738          * the allocation. */
739
740         if (ENABLE_THREADED_COMPILER)
741                 lightrec_code_alloc_lock(state);
742
743         tlsf_realloc(state->tlsf, ptr, size);
744
745         if (ENABLE_THREADED_COMPILER)
746                 lightrec_code_alloc_unlock(state);
747 }
748
749 static void lightrec_free_code(struct lightrec_state *state, void *ptr)
750 {
751         if (ENABLE_THREADED_COMPILER)
752                 lightrec_code_alloc_lock(state);
753
754         tlsf_free(state->tlsf, ptr);
755
756         if (ENABLE_THREADED_COMPILER)
757                 lightrec_code_alloc_unlock(state);
758 }
759
760 static void * lightrec_emit_code(struct lightrec_state *state,
761                                  const struct block *block,
762                                  jit_state_t *_jit, unsigned int *size)
763 {
764         bool has_code_buffer = ENABLE_CODE_BUFFER && state->tlsf;
765         jit_word_t code_size, new_code_size;
766         void *code;
767
768         jit_realize();
769
770         if (!ENABLE_DISASSEMBLER)
771                 jit_set_data(NULL, 0, JIT_DISABLE_DATA | JIT_DISABLE_NOTE);
772
773         if (has_code_buffer) {
774                 jit_get_code(&code_size);
775                 code = lightrec_alloc_code(state, (size_t) code_size);
776
777                 if (!code) {
778                         if (ENABLE_THREADED_COMPILER) {
779                                 /* If we're using the threaded compiler, return
780                                  * an allocation error here. The threaded
781                                  * compiler will then empty its job queue and
782                                  * request a code flush using the reaper. */
783                                 return NULL;
784                         }
785
786                         /* Remove outdated blocks, and try again */
787                         lightrec_remove_outdated_blocks(state->block_cache, block);
788
789                         pr_debug("Re-try to alloc %zu bytes...\n", code_size);
790
791                         code = lightrec_alloc_code(state, code_size);
792                         if (!code) {
793                                 pr_err("Could not alloc even after removing old blocks!\n");
794                                 return NULL;
795                         }
796                 }
797
798                 jit_set_code(code, code_size);
799         }
800
801         code = jit_emit();
802
803         jit_get_code(&new_code_size);
804         lightrec_register(MEM_FOR_CODE, new_code_size);
805
806         if (has_code_buffer) {
807                 lightrec_realloc_code(state, code, (size_t) new_code_size);
808
809                 pr_debug("Creating code block at address 0x%" PRIxPTR ", "
810                          "code size: %" PRIuPTR " new: %" PRIuPTR "\n",
811                          (uintptr_t) code, code_size, new_code_size);
812         }
813
814         *size = (unsigned int) new_code_size;
815
816         return code;
817 }
818
819 static struct block * generate_wrapper(struct lightrec_state *state)
820 {
821         struct block *block;
822         jit_state_t *_jit;
823         unsigned int i;
824         int stack_ptr;
825         jit_node_t *to_tramp, *to_fn_epilog;
826         jit_node_t *addr[C_WRAPPERS_COUNT - 1];
827
828         block = lightrec_malloc(state, MEM_FOR_IR, sizeof(*block));
829         if (!block)
830                 goto err_no_mem;
831
832         _jit = jit_new_state();
833         if (!_jit)
834                 goto err_free_block;
835
836         jit_name("RW wrapper");
837         jit_note(__FILE__, __LINE__);
838
839         /* Wrapper entry point */
840         jit_prolog();
841         jit_tramp(256);
842
843         /* Add entry points; separate them by opcodes that increment
844          * LIGHTREC_REG_STATE (since we cannot touch other registers).
845          * The difference will then tell us which C function to call. */
846         for (i = C_WRAPPERS_COUNT - 1; i > 0; i--) {
847                 jit_addi(LIGHTREC_REG_STATE, LIGHTREC_REG_STATE, __WORDSIZE / 8);
848                 addr[i - 1] = jit_indirect();
849         }
850
851         jit_epilog();
852         jit_prolog();
853
854         stack_ptr = jit_allocai(sizeof(uintptr_t) * NUM_TEMPS);
855
856         /* Save all temporaries on stack */
857         for (i = 0; i < NUM_TEMPS; i++)
858                 jit_stxi(stack_ptr + i * sizeof(uintptr_t), JIT_FP, JIT_R(i));
859
860         jit_getarg(JIT_R1, jit_arg());
861
862         /* Jump to the trampoline */
863         to_tramp = jit_jmpi();
864
865         /* The trampoline will jump back here */
866         to_fn_epilog = jit_label();
867
868         /* Restore temporaries from stack */
869         for (i = 0; i < NUM_TEMPS; i++)
870                 jit_ldxi(JIT_R(i), JIT_FP, stack_ptr + i * sizeof(uintptr_t));
871
872         jit_ret();
873         jit_epilog();
874
875         /* Trampoline entry point.
876          * The sole purpose of the trampoline is to cheese Lightning not to
877          * save/restore the callee-saved register LIGHTREC_REG_CYCLE, since we
878          * do want to return to the caller with this register modified. */
879         jit_prolog();
880         jit_tramp(256);
881         jit_patch(to_tramp);
882
883         /* Retrieve the wrapper function */
884         jit_ldxi(JIT_R0, LIGHTREC_REG_STATE,
885                  offsetof(struct lightrec_state, c_wrappers));
886
887         /* Restore LIGHTREC_REG_STATE to its correct value */
888         jit_movi(LIGHTREC_REG_STATE, (uintptr_t) state);
889
890         jit_prepare();
891         jit_pushargr(LIGHTREC_REG_STATE);
892         jit_pushargr(LIGHTREC_REG_CYCLE);
893         jit_pushargr(JIT_R0);
894         jit_pushargr(JIT_R1);
895         jit_finishi(c_function_wrapper);
896         jit_retval_i(LIGHTREC_REG_CYCLE);
897
898         jit_patch_at(jit_jmpi(), to_fn_epilog);
899         jit_epilog();
900
901         block->_jit = _jit;
902         block->opcode_list = NULL;
903         block->flags = 0;
904         block->nb_ops = 0;
905
906         block->function = lightrec_emit_code(state, block, _jit,
907                                              &block->code_size);
908         if (!block->function)
909                 goto err_free_block;
910
911         state->wrappers_eps[C_WRAPPERS_COUNT - 1] = block->function;
912
913         for (i = 0; i < C_WRAPPERS_COUNT - 1; i++)
914                 state->wrappers_eps[i] = jit_address(addr[i]);
915
916         if (ENABLE_DISASSEMBLER) {
917                 pr_debug("Wrapper block:\n");
918                 jit_disassemble();
919         }
920
921         jit_clear_state();
922         return block;
923
924 err_free_block:
925         lightrec_free(state, MEM_FOR_IR, sizeof(*block), block);
926 err_no_mem:
927         pr_err("Unable to compile wrapper: Out of memory\n");
928         return NULL;
929 }
930
931 static u32 lightrec_memset(struct lightrec_state *state)
932 {
933         u32 kunseg_pc = kunseg(state->regs.gpr[4]);
934         void *host;
935         const struct lightrec_mem_map *map = lightrec_get_map(state, &host, kunseg_pc);
936         u32 length = state->regs.gpr[5] * 4;
937
938         if (!map) {
939                 pr_err("Unable to find memory map for memset target address "
940                        "0x%x\n", kunseg_pc);
941                 return 0;
942         }
943
944         pr_debug("Calling host memset, PC 0x%x (host address 0x%" PRIxPTR ") for %u bytes\n",
945                  kunseg_pc, (uintptr_t)host, length);
946         memset(host, 0, length);
947
948         if (!state->invalidate_from_dma_only)
949                 lightrec_invalidate_map(state, map, kunseg_pc, length);
950
951         /* Rough estimation of the number of cycles consumed */
952         return 8 + 5 * (length  + 3 / 4);
953 }
954
955 static struct block * generate_dispatcher(struct lightrec_state *state)
956 {
957         struct block *block;
958         jit_state_t *_jit;
959         jit_node_t *to_end, *loop, *addr, *addr2, *addr3;
960         unsigned int i;
961         u32 offset;
962
963         block = lightrec_malloc(state, MEM_FOR_IR, sizeof(*block));
964         if (!block)
965                 goto err_no_mem;
966
967         _jit = jit_new_state();
968         if (!_jit)
969                 goto err_free_block;
970
971         jit_name("dispatcher");
972         jit_note(__FILE__, __LINE__);
973
974         jit_prolog();
975         jit_frame(256);
976
977         jit_getarg(JIT_R0, jit_arg());
978         jit_getarg_i(LIGHTREC_REG_CYCLE, jit_arg());
979
980         /* Force all callee-saved registers to be pushed on the stack */
981         for (i = 0; i < NUM_REGS; i++)
982                 jit_movr(JIT_V(i), JIT_V(i));
983
984         /* Pass lightrec_state structure to blocks, using the last callee-saved
985          * register that Lightning provides */
986         jit_movi(LIGHTREC_REG_STATE, (intptr_t) state);
987
988         loop = jit_label();
989
990         /* Call the block's code */
991         jit_jmpr(JIT_R0);
992
993         if (OPT_REPLACE_MEMSET) {
994                 /* Blocks will jump here when they need to call
995                  * lightrec_memset() */
996                 addr3 = jit_indirect();
997
998                 jit_prepare();
999                 jit_pushargr(LIGHTREC_REG_STATE);
1000                 jit_finishi(lightrec_memset);
1001
1002                 jit_ldxi_ui(JIT_V0, LIGHTREC_REG_STATE,
1003                             offsetof(struct lightrec_state, regs.gpr[31]));
1004
1005                 jit_retval(JIT_R0);
1006                 jit_subr(LIGHTREC_REG_CYCLE, LIGHTREC_REG_CYCLE, JIT_R0);
1007         }
1008
1009         /* The block will jump here, with the number of cycles remaining in
1010          * LIGHTREC_REG_CYCLE */
1011         addr2 = jit_indirect();
1012
1013         /* Store back the next_pc to the lightrec_state structure */
1014         offset = offsetof(struct lightrec_state, next_pc);
1015         jit_stxi_i(offset, LIGHTREC_REG_STATE, JIT_V0);
1016
1017         /* Jump to end if state->target_cycle < state->current_cycle */
1018         to_end = jit_blei(LIGHTREC_REG_CYCLE, 0);
1019
1020         /* Convert next PC to KUNSEG and avoid mirrors */
1021         jit_andi(JIT_R0, JIT_V0, 0x10000000 | (RAM_SIZE - 1));
1022         jit_rshi_u(JIT_R1, JIT_R0, 28);
1023         jit_andi(JIT_R2, JIT_V0, BIOS_SIZE - 1);
1024         jit_addi(JIT_R2, JIT_R2, RAM_SIZE);
1025         jit_movnr(JIT_R0, JIT_R2, JIT_R1);
1026
1027         /* If possible, use the code LUT */
1028         if (!lut_is_32bit(state))
1029                 jit_lshi(JIT_R0, JIT_R0, 1);
1030         jit_addr(JIT_R0, JIT_R0, LIGHTREC_REG_STATE);
1031
1032         offset = offsetof(struct lightrec_state, code_lut);
1033         if (lut_is_32bit(state))
1034                 jit_ldxi_ui(JIT_R0, JIT_R0, offset);
1035         else
1036                 jit_ldxi(JIT_R0, JIT_R0, offset);
1037
1038         /* If we get non-NULL, loop */
1039         jit_patch_at(jit_bnei(JIT_R0, 0), loop);
1040
1041         /* Slow path: call C function get_next_block_func() */
1042
1043         if (ENABLE_FIRST_PASS || OPT_DETECT_IMPOSSIBLE_BRANCHES) {
1044                 /* We may call the interpreter - update state->current_cycle */
1045                 jit_ldxi_i(JIT_R2, LIGHTREC_REG_STATE,
1046                            offsetof(struct lightrec_state, target_cycle));
1047                 jit_subr(JIT_R1, JIT_R2, LIGHTREC_REG_CYCLE);
1048                 jit_stxi_i(offsetof(struct lightrec_state, current_cycle),
1049                            LIGHTREC_REG_STATE, JIT_R1);
1050         }
1051
1052         /* The code LUT will be set to this address when the block at the target
1053          * PC has been preprocessed but not yet compiled by the threaded
1054          * recompiler */
1055         addr = jit_indirect();
1056
1057         /* Get the next block */
1058         jit_prepare();
1059         jit_pushargr(LIGHTREC_REG_STATE);
1060         jit_pushargr(JIT_V0);
1061         jit_finishi(&get_next_block_func);
1062         jit_retval(JIT_R0);
1063
1064         if (ENABLE_FIRST_PASS || OPT_DETECT_IMPOSSIBLE_BRANCHES) {
1065                 /* The interpreter may have updated state->current_cycle and
1066                  * state->target_cycle - recalc the delta */
1067                 jit_ldxi_i(JIT_R1, LIGHTREC_REG_STATE,
1068                            offsetof(struct lightrec_state, current_cycle));
1069                 jit_ldxi_i(JIT_R2, LIGHTREC_REG_STATE,
1070                            offsetof(struct lightrec_state, target_cycle));
1071                 jit_subr(LIGHTREC_REG_CYCLE, JIT_R2, JIT_R1);
1072         }
1073
1074         /* If we get non-NULL, loop */
1075         jit_patch_at(jit_bnei(JIT_R0, 0), loop);
1076
1077         /* When exiting, the recompiled code will jump to that address */
1078         jit_note(__FILE__, __LINE__);
1079         jit_patch(to_end);
1080
1081         jit_retr(LIGHTREC_REG_CYCLE);
1082         jit_epilog();
1083
1084         block->_jit = _jit;
1085         block->opcode_list = NULL;
1086         block->flags = 0;
1087         block->nb_ops = 0;
1088
1089         block->function = lightrec_emit_code(state, block, _jit,
1090                                              &block->code_size);
1091         if (!block->function)
1092                 goto err_free_block;
1093
1094         state->eob_wrapper_func = jit_address(addr2);
1095         if (OPT_REPLACE_MEMSET)
1096                 state->memset_func = jit_address(addr3);
1097         state->get_next_block = jit_address(addr);
1098
1099         if (ENABLE_DISASSEMBLER) {
1100                 pr_debug("Dispatcher block:\n");
1101                 jit_disassemble();
1102         }
1103
1104         /* We're done! */
1105         jit_clear_state();
1106         return block;
1107
1108 err_free_block:
1109         lightrec_free(state, MEM_FOR_IR, sizeof(*block), block);
1110 err_no_mem:
1111         pr_err("Unable to compile dispatcher: Out of memory\n");
1112         return NULL;
1113 }
1114
1115 union code lightrec_read_opcode(struct lightrec_state *state, u32 pc)
1116 {
1117         void *host = NULL;
1118
1119         lightrec_get_map(state, &host, kunseg(pc));
1120
1121         const u32 *code = (u32 *)host;
1122         return (union code) LE32TOH(*code);
1123 }
1124
1125 unsigned int lightrec_cycles_of_opcode(union code code)
1126 {
1127         return 2;
1128 }
1129
1130 void lightrec_free_opcode_list(struct lightrec_state *state, struct block *block)
1131 {
1132         lightrec_free(state, MEM_FOR_IR,
1133                       sizeof(*block->opcode_list) * block->nb_ops,
1134                       block->opcode_list);
1135 }
1136
1137 static unsigned int lightrec_get_mips_block_len(const u32 *src)
1138 {
1139         unsigned int i;
1140         union code c;
1141
1142         for (i = 1; ; i++) {
1143                 c.opcode = LE32TOH(*src++);
1144
1145                 if (is_syscall(c))
1146                         return i;
1147
1148                 if (is_unconditional_jump(c))
1149                         return i + 1;
1150         }
1151 }
1152
1153 static struct opcode * lightrec_disassemble(struct lightrec_state *state,
1154                                             const u32 *src, unsigned int *len)
1155 {
1156         struct opcode *list;
1157         unsigned int i, length;
1158
1159         length = lightrec_get_mips_block_len(src);
1160
1161         list = lightrec_malloc(state, MEM_FOR_IR, sizeof(*list) * length);
1162         if (!list) {
1163                 pr_err("Unable to allocate memory\n");
1164                 return NULL;
1165         }
1166
1167         for (i = 0; i < length; i++) {
1168                 list[i].opcode = LE32TOH(src[i]);
1169                 list[i].flags = 0;
1170         }
1171
1172         *len = length * sizeof(u32);
1173
1174         return list;
1175 }
1176
1177 static struct block * lightrec_precompile_block(struct lightrec_state *state,
1178                                                 u32 pc)
1179 {
1180         struct opcode *list;
1181         struct block *block;
1182         void *host;
1183         const struct lightrec_mem_map *map = lightrec_get_map(state, &host, kunseg(pc));
1184         const u32 *code = (u32 *) host;
1185         unsigned int length;
1186         bool fully_tagged;
1187
1188         if (!map)
1189                 return NULL;
1190
1191         block = lightrec_malloc(state, MEM_FOR_IR, sizeof(*block));
1192         if (!block) {
1193                 pr_err("Unable to recompile block: Out of memory\n");
1194                 return NULL;
1195         }
1196
1197         list = lightrec_disassemble(state, code, &length);
1198         if (!list) {
1199                 lightrec_free(state, MEM_FOR_IR, sizeof(*block), block);
1200                 return NULL;
1201         }
1202
1203         block->pc = pc;
1204         block->_jit = NULL;
1205         block->function = NULL;
1206         block->opcode_list = list;
1207         block->code = code;
1208         block->next = NULL;
1209         block->flags = 0;
1210         block->code_size = 0;
1211         block->precompile_date = state->current_cycle;
1212 #if ENABLE_THREADED_COMPILER
1213         block->op_list_freed = (atomic_flag)ATOMIC_FLAG_INIT;
1214 #endif
1215         block->nb_ops = length / sizeof(u32);
1216
1217         lightrec_optimize(state, block);
1218
1219         length = block->nb_ops * sizeof(u32);
1220
1221         lightrec_register(MEM_FOR_MIPS_CODE, length);
1222
1223         if (ENABLE_DISASSEMBLER) {
1224                 pr_debug("Disassembled block at PC: 0x%08x\n", block->pc);
1225                 lightrec_print_disassembly(block, code);
1226         }
1227
1228         pr_debug("Block size: %hu opcodes\n", block->nb_ops);
1229
1230         /* If the first opcode is an 'impossible' branch, never compile the
1231          * block */
1232         if (should_emulate(block->opcode_list))
1233                 block->flags |= BLOCK_NEVER_COMPILE;
1234
1235         fully_tagged = lightrec_block_is_fully_tagged(block);
1236         if (fully_tagged)
1237                 block->flags |= BLOCK_FULLY_TAGGED;
1238
1239         if (OPT_REPLACE_MEMSET && (block->flags & BLOCK_IS_MEMSET))
1240                 lut_write(state, lut_offset(pc), state->memset_func);
1241
1242         block->hash = lightrec_calculate_block_hash(block);
1243
1244         pr_debug("Recompile count: %u\n", state->nb_precompile++);
1245
1246         return block;
1247 }
1248
1249 static bool lightrec_block_is_fully_tagged(const struct block *block)
1250 {
1251         const struct opcode *op;
1252         unsigned int i;
1253
1254         for (i = 0; i < block->nb_ops; i++) {
1255                 op = &block->opcode_list[i];
1256
1257                 /* Verify that all load/stores of the opcode list
1258                  * Check all loads/stores of the opcode list and mark the
1259                  * block as fully compiled if they all have been tagged. */
1260                 switch (op->c.i.op) {
1261                 case OP_LB:
1262                 case OP_LH:
1263                 case OP_LWL:
1264                 case OP_LW:
1265                 case OP_LBU:
1266                 case OP_LHU:
1267                 case OP_LWR:
1268                 case OP_SB:
1269                 case OP_SH:
1270                 case OP_SWL:
1271                 case OP_SW:
1272                 case OP_SWR:
1273                 case OP_LWC2:
1274                 case OP_SWC2:
1275                         if (!LIGHTREC_FLAGS_GET_IO_MODE(op->flags))
1276                                 return false;
1277                         fallthrough;
1278                 default:
1279                         continue;
1280                 }
1281         }
1282
1283         return true;
1284 }
1285
1286 static void lightrec_reap_block(struct lightrec_state *state, void *data)
1287 {
1288         struct block *block = data;
1289
1290         pr_debug("Reap dead block at PC 0x%08x\n", block->pc);
1291         lightrec_unregister_block(state->block_cache, block);
1292         lightrec_free_block(state, block);
1293 }
1294
1295 static void lightrec_reap_jit(struct lightrec_state *state, void *data)
1296 {
1297         _jit_destroy_state(data);
1298 }
1299
1300 static void lightrec_free_function(struct lightrec_state *state, void *fn)
1301 {
1302         if (ENABLE_CODE_BUFFER && state->tlsf) {
1303                 pr_debug("Freeing code block at 0x%" PRIxPTR "\n", (uintptr_t) fn);
1304                 lightrec_free_code(state, fn);
1305         }
1306 }
1307
1308 static void lightrec_reap_function(struct lightrec_state *state, void *data)
1309 {
1310         lightrec_free_function(state, data);
1311 }
1312
1313 int lightrec_compile_block(struct lightrec_cstate *cstate,
1314                            struct block *block)
1315 {
1316         struct lightrec_state *state = cstate->state;
1317         struct lightrec_branch_target *target;
1318         bool op_list_freed = false, fully_tagged = false;
1319         struct block *block2;
1320         struct opcode *elm;
1321         jit_state_t *_jit, *oldjit;
1322         jit_node_t *start_of_block;
1323         bool skip_next = false;
1324         void *old_fn, *new_fn;
1325         unsigned int i, j;
1326         u32 offset;
1327
1328         fully_tagged = lightrec_block_is_fully_tagged(block);
1329         if (fully_tagged)
1330                 block->flags |= BLOCK_FULLY_TAGGED;
1331
1332         _jit = jit_new_state();
1333         if (!_jit)
1334                 return -ENOMEM;
1335
1336         oldjit = block->_jit;
1337         old_fn = block->function;
1338         block->_jit = _jit;
1339
1340         lightrec_regcache_reset(cstate->reg_cache);
1341         cstate->cycles = 0;
1342         cstate->nb_branches = 0;
1343         cstate->nb_local_branches = 0;
1344         cstate->nb_targets = 0;
1345
1346         jit_prolog();
1347         jit_tramp(256);
1348
1349         start_of_block = jit_label();
1350
1351         for (i = 0; i < block->nb_ops; i++) {
1352                 elm = &block->opcode_list[i];
1353
1354                 if (skip_next) {
1355                         skip_next = false;
1356                         continue;
1357                 }
1358
1359                 if (should_emulate(elm)) {
1360                         pr_debug("Branch at offset 0x%x will be emulated\n",
1361                                  i << 2);
1362
1363                         lightrec_emit_eob(cstate, block, i, false);
1364                         skip_next = !op_flag_no_ds(elm->flags);
1365                 } else {
1366                         lightrec_rec_opcode(cstate, block, i);
1367                         skip_next = !op_flag_no_ds(elm->flags) && has_delay_slot(elm->c);
1368 #if _WIN32
1369                         /* FIXME: GNU Lightning on Windows seems to use our
1370                          * mapped registers as temporaries. Until the actual bug
1371                          * is found and fixed, unconditionally mark our
1372                          * registers as live here. */
1373                         lightrec_regcache_mark_live(cstate->reg_cache, _jit);
1374 #endif
1375                 }
1376
1377                 cstate->cycles += lightrec_cycles_of_opcode(elm->c);
1378         }
1379
1380         for (i = 0; i < cstate->nb_branches; i++)
1381                 jit_patch(cstate->branches[i]);
1382
1383         for (i = 0; i < cstate->nb_local_branches; i++) {
1384                 struct lightrec_branch *branch = &cstate->local_branches[i];
1385
1386                 pr_debug("Patch local branch to offset 0x%x\n",
1387                          branch->target << 2);
1388
1389                 if (branch->target == 0) {
1390                         jit_patch_at(branch->branch, start_of_block);
1391                         continue;
1392                 }
1393
1394                 for (j = 0; j < cstate->nb_targets; j++) {
1395                         if (cstate->targets[j].offset == branch->target) {
1396                                 jit_patch_at(branch->branch,
1397                                              cstate->targets[j].label);
1398                                 break;
1399                         }
1400                 }
1401
1402                 if (j == cstate->nb_targets)
1403                         pr_err("Unable to find branch target\n");
1404         }
1405
1406         jit_patch_abs(jit_jmpi(), state->eob_wrapper_func);
1407         jit_ret();
1408         jit_epilog();
1409
1410         new_fn = lightrec_emit_code(state, block, _jit, &block->code_size);
1411         if (!new_fn) {
1412                 if (!ENABLE_THREADED_COMPILER)
1413                         pr_err("Unable to compile block!\n");
1414                 block->_jit = oldjit;
1415                 _jit_destroy_state(_jit);
1416                 return -ENOMEM;
1417         }
1418
1419         block->function = new_fn;
1420         block->flags &= ~BLOCK_SHOULD_RECOMPILE;
1421
1422         /* Add compiled function to the LUT */
1423         lut_write(state, lut_offset(block->pc), block->function);
1424
1425         if (ENABLE_THREADED_COMPILER) {
1426                 /* Since we might try to reap the same block multiple times,
1427                  * we need the reaper to wait until everything has been
1428                  * submitted, so that the duplicate entries can be dropped. */
1429                 lightrec_reaper_pause(state->reaper);
1430         }
1431
1432         /* Detect old blocks that have been covered by the new one */
1433         for (i = 0; i < cstate->nb_targets; i++) {
1434                 target = &cstate->targets[i];
1435
1436                 if (!target->offset)
1437                         continue;
1438
1439                 offset = block->pc + target->offset * sizeof(u32);
1440                 block2 = lightrec_find_block(state->block_cache, offset);
1441                 if (block2) {
1442                         /* No need to check if block2 is compilable - it must
1443                          * be, otherwise block wouldn't be compilable either */
1444
1445                         /* Set the "block dead" flag to prevent the dynarec from
1446                          * recompiling this block */
1447                         block2->flags |= BLOCK_IS_DEAD;
1448
1449                         /* If block2 was pending for compilation, cancel it.
1450                          * If it's being compiled right now, wait until it
1451                          * finishes. */
1452                         if (ENABLE_THREADED_COMPILER)
1453                                 lightrec_recompiler_remove(state->rec, block2);
1454                 }
1455
1456                 /* We know from now on that block2 (if present) isn't going to
1457                  * be compiled. We can override the LUT entry with our new
1458                  * block's entry point. */
1459                 offset = lut_offset(block->pc) + target->offset;
1460                 lut_write(state, offset, jit_address(target->label));
1461
1462                 if (block2) {
1463                         pr_debug("Reap block 0x%08x as it's covered by block "
1464                                  "0x%08x\n", block2->pc, block->pc);
1465
1466                         /* Finally, reap the block. */
1467                         if (ENABLE_THREADED_COMPILER) {
1468                                 lightrec_reaper_add(state->reaper,
1469                                                     lightrec_reap_block,
1470                                                     block2);
1471                         } else {
1472                                 lightrec_unregister_block(state->block_cache, block2);
1473                                 lightrec_free_block(state, block2);
1474                         }
1475                 }
1476         }
1477
1478         if (ENABLE_THREADED_COMPILER)
1479                 lightrec_reaper_continue(state->reaper);
1480
1481         if (ENABLE_DISASSEMBLER) {
1482                 pr_debug("Compiling block at PC: 0x%08x\n", block->pc);
1483                 jit_disassemble();
1484         }
1485
1486         jit_clear_state();
1487
1488 #if ENABLE_THREADED_COMPILER
1489         if (fully_tagged)
1490                 op_list_freed = atomic_flag_test_and_set(&block->op_list_freed);
1491 #endif
1492         if (fully_tagged && !op_list_freed) {
1493                 pr_debug("Block PC 0x%08x is fully tagged"
1494                          " - free opcode list\n", block->pc);
1495                 lightrec_free_opcode_list(state, block);
1496                 block->opcode_list = NULL;
1497         }
1498
1499         if (oldjit) {
1500                 pr_debug("Block 0x%08x recompiled, reaping old jit context.\n",
1501                          block->pc);
1502
1503                 if (ENABLE_THREADED_COMPILER) {
1504                         lightrec_reaper_add(state->reaper,
1505                                             lightrec_reap_jit, oldjit);
1506                         lightrec_reaper_add(state->reaper,
1507                                             lightrec_reap_function, old_fn);
1508                 } else {
1509                         _jit_destroy_state(oldjit);
1510                         lightrec_free_function(state, old_fn);
1511                 }
1512         }
1513
1514         return 0;
1515 }
1516
1517 static void lightrec_print_info(struct lightrec_state *state)
1518 {
1519         if ((state->current_cycle & ~0xfffffff) != state->old_cycle_counter) {
1520                 pr_info("Lightrec RAM usage: IR %u KiB, CODE %u KiB, "
1521                         "MIPS %u KiB, TOTAL %u KiB, avg. IPI %f\n",
1522                         lightrec_get_mem_usage(MEM_FOR_IR) / 1024,
1523                         lightrec_get_mem_usage(MEM_FOR_CODE) / 1024,
1524                         lightrec_get_mem_usage(MEM_FOR_MIPS_CODE) / 1024,
1525                         lightrec_get_total_mem_usage() / 1024,
1526                        lightrec_get_average_ipi());
1527                 state->old_cycle_counter = state->current_cycle & ~0xfffffff;
1528         }
1529 }
1530
1531 u32 lightrec_execute(struct lightrec_state *state, u32 pc, u32 target_cycle)
1532 {
1533         s32 (*func)(void *, s32) = (void *)state->dispatcher->function;
1534         void *block_trace;
1535         s32 cycles_delta;
1536
1537         state->exit_flags = LIGHTREC_EXIT_NORMAL;
1538
1539         /* Handle the cycle counter overflowing */
1540         if (unlikely(target_cycle < state->current_cycle))
1541                 target_cycle = UINT_MAX;
1542
1543         state->target_cycle = target_cycle;
1544         state->next_pc = pc;
1545
1546         block_trace = get_next_block_func(state, pc);
1547         if (block_trace) {
1548                 cycles_delta = state->target_cycle - state->current_cycle;
1549
1550                 cycles_delta = (*func)(block_trace, cycles_delta);
1551
1552                 state->current_cycle = state->target_cycle - cycles_delta;
1553         }
1554
1555         if (ENABLE_THREADED_COMPILER)
1556                 lightrec_reaper_reap(state->reaper);
1557
1558         if (LOG_LEVEL >= INFO_L)
1559                 lightrec_print_info(state);
1560
1561         return state->next_pc;
1562 }
1563
1564 u32 lightrec_execute_one(struct lightrec_state *state, u32 pc)
1565 {
1566         return lightrec_execute(state, pc, state->current_cycle);
1567 }
1568
1569 u32 lightrec_run_interpreter(struct lightrec_state *state, u32 pc)
1570 {
1571         struct block *block = lightrec_get_block(state, pc);
1572         if (!block)
1573                 return 0;
1574
1575         state->exit_flags = LIGHTREC_EXIT_NORMAL;
1576
1577         pc = lightrec_emulate_block(state, block, pc);
1578
1579         if (LOG_LEVEL >= INFO_L)
1580                 lightrec_print_info(state);
1581
1582         return pc;
1583 }
1584
1585 void lightrec_free_block(struct lightrec_state *state, struct block *block)
1586 {
1587         lightrec_unregister(MEM_FOR_MIPS_CODE, block->nb_ops * sizeof(u32));
1588         if (block->opcode_list)
1589                 lightrec_free_opcode_list(state, block);
1590         if (block->_jit)
1591                 _jit_destroy_state(block->_jit);
1592         if (block->function) {
1593                 lightrec_free_function(state, block->function);
1594                 lightrec_unregister(MEM_FOR_CODE, block->code_size);
1595         }
1596         lightrec_free(state, MEM_FOR_IR, sizeof(*block), block);
1597 }
1598
1599 struct lightrec_cstate * lightrec_create_cstate(struct lightrec_state *state)
1600 {
1601         struct lightrec_cstate *cstate;
1602
1603         cstate = lightrec_malloc(state, MEM_FOR_LIGHTREC, sizeof(*cstate));
1604         if (!cstate)
1605                 return NULL;
1606
1607         cstate->reg_cache = lightrec_regcache_init(state);
1608         if (!cstate->reg_cache) {
1609                 lightrec_free(state, MEM_FOR_LIGHTREC, sizeof(*cstate), cstate);
1610                 return NULL;
1611         }
1612
1613         cstate->state = state;
1614
1615         return cstate;
1616 }
1617
1618 void lightrec_free_cstate(struct lightrec_cstate *cstate)
1619 {
1620         lightrec_free_regcache(cstate->reg_cache);
1621         lightrec_free(cstate->state, MEM_FOR_LIGHTREC, sizeof(*cstate), cstate);
1622 }
1623
1624 struct lightrec_state * lightrec_init(char *argv0,
1625                                       const struct lightrec_mem_map *map,
1626                                       size_t nb,
1627                                       const struct lightrec_ops *ops)
1628 {
1629         const struct lightrec_mem_map *codebuf_map = &map[PSX_MAP_CODE_BUFFER];
1630         struct lightrec_state *state;
1631         uintptr_t addr;
1632         void *tlsf = NULL;
1633         bool with_32bit_lut = false;
1634         size_t lut_size;
1635
1636         /* Sanity-check ops */
1637         if (!ops || !ops->cop2_op || !ops->enable_ram) {
1638                 pr_err("Missing callbacks in lightrec_ops structure\n");
1639                 return NULL;
1640         }
1641
1642         if (ENABLE_CODE_BUFFER && nb > PSX_MAP_CODE_BUFFER
1643             && codebuf_map->address) {
1644                 tlsf = tlsf_create_with_pool(codebuf_map->address,
1645                                              codebuf_map->length);
1646                 if (!tlsf) {
1647                         pr_err("Unable to initialize code buffer\n");
1648                         return NULL;
1649                 }
1650
1651                 if (__WORDSIZE == 64) {
1652                         addr = (uintptr_t) codebuf_map->address + codebuf_map->length - 1;
1653                         with_32bit_lut = addr == (u32) addr;
1654                 }
1655         }
1656
1657         if (with_32bit_lut)
1658                 lut_size = CODE_LUT_SIZE * 4;
1659         else
1660                 lut_size = CODE_LUT_SIZE * sizeof(void *);
1661
1662         init_jit(argv0);
1663
1664         state = calloc(1, sizeof(*state) + lut_size);
1665         if (!state)
1666                 goto err_finish_jit;
1667
1668         lightrec_register(MEM_FOR_LIGHTREC, sizeof(*state) + lut_size);
1669
1670         state->tlsf = tlsf;
1671         state->with_32bit_lut = with_32bit_lut;
1672
1673         state->block_cache = lightrec_blockcache_init(state);
1674         if (!state->block_cache)
1675                 goto err_free_state;
1676
1677         if (ENABLE_THREADED_COMPILER) {
1678                 state->rec = lightrec_recompiler_init(state);
1679                 if (!state->rec)
1680                         goto err_free_block_cache;
1681
1682                 state->reaper = lightrec_reaper_init(state);
1683                 if (!state->reaper)
1684                         goto err_free_recompiler;
1685         } else {
1686                 state->cstate = lightrec_create_cstate(state);
1687                 if (!state->cstate)
1688                         goto err_free_block_cache;
1689         }
1690
1691         state->nb_maps = nb;
1692         state->maps = map;
1693
1694         memcpy(&state->ops, ops, sizeof(*ops));
1695
1696         state->dispatcher = generate_dispatcher(state);
1697         if (!state->dispatcher)
1698                 goto err_free_reaper;
1699
1700         state->c_wrapper_block = generate_wrapper(state);
1701         if (!state->c_wrapper_block)
1702                 goto err_free_dispatcher;
1703
1704         state->c_wrappers[C_WRAPPER_RW] = lightrec_rw_cb;
1705         state->c_wrappers[C_WRAPPER_RW_GENERIC] = lightrec_rw_generic_cb;
1706         state->c_wrappers[C_WRAPPER_MTC] = lightrec_mtc_cb;
1707         state->c_wrappers[C_WRAPPER_CP] = lightrec_cp_cb;
1708         state->c_wrappers[C_WRAPPER_SYSCALL] = lightrec_syscall_cb;
1709         state->c_wrappers[C_WRAPPER_BREAK] = lightrec_break_cb;
1710
1711         map = &state->maps[PSX_MAP_BIOS];
1712         state->offset_bios = (uintptr_t)map->address - map->pc;
1713
1714         map = &state->maps[PSX_MAP_SCRATCH_PAD];
1715         state->offset_scratch = (uintptr_t)map->address - map->pc;
1716
1717         map = &state->maps[PSX_MAP_KERNEL_USER_RAM];
1718         state->offset_ram = (uintptr_t)map->address - map->pc;
1719
1720         if (state->maps[PSX_MAP_MIRROR1].address == map->address + 0x200000 &&
1721             state->maps[PSX_MAP_MIRROR2].address == map->address + 0x400000 &&
1722             state->maps[PSX_MAP_MIRROR3].address == map->address + 0x600000)
1723                 state->mirrors_mapped = true;
1724
1725         if (state->offset_bios == 0 &&
1726             state->offset_scratch == 0 &&
1727             state->offset_ram == 0 &&
1728             state->mirrors_mapped) {
1729                 pr_info("Memory map is perfect. Emitted code will be best.\n");
1730         } else {
1731                 pr_info("Memory map is sub-par. Emitted code will be slow.\n");
1732         }
1733
1734         if (state->with_32bit_lut)
1735                 pr_info("Using 32-bit LUT\n");
1736
1737         return state;
1738
1739 err_free_dispatcher:
1740         lightrec_free_block(state, state->dispatcher);
1741 err_free_reaper:
1742         if (ENABLE_THREADED_COMPILER)
1743                 lightrec_reaper_destroy(state->reaper);
1744 err_free_recompiler:
1745         if (ENABLE_THREADED_COMPILER)
1746                 lightrec_free_recompiler(state->rec);
1747         else
1748                 lightrec_free_cstate(state->cstate);
1749 err_free_block_cache:
1750         lightrec_free_block_cache(state->block_cache);
1751 err_free_state:
1752         lightrec_unregister(MEM_FOR_LIGHTREC, sizeof(*state) +
1753                             lut_elm_size(state) * CODE_LUT_SIZE);
1754         free(state);
1755 err_finish_jit:
1756         finish_jit();
1757         if (ENABLE_CODE_BUFFER && tlsf)
1758                 tlsf_destroy(tlsf);
1759         return NULL;
1760 }
1761
1762 void lightrec_destroy(struct lightrec_state *state)
1763 {
1764         /* Force a print info on destroy*/
1765         state->current_cycle = ~state->current_cycle;
1766         lightrec_print_info(state);
1767
1768         lightrec_free_block_cache(state->block_cache);
1769         lightrec_free_block(state, state->dispatcher);
1770         lightrec_free_block(state, state->c_wrapper_block);
1771
1772         if (ENABLE_THREADED_COMPILER) {
1773                 lightrec_free_recompiler(state->rec);
1774                 lightrec_reaper_destroy(state->reaper);
1775         } else {
1776                 lightrec_free_cstate(state->cstate);
1777         }
1778
1779         finish_jit();
1780         if (ENABLE_CODE_BUFFER && state->tlsf)
1781                 tlsf_destroy(state->tlsf);
1782
1783         lightrec_unregister(MEM_FOR_LIGHTREC, sizeof(*state) +
1784                             lut_elm_size(state) * CODE_LUT_SIZE);
1785         free(state);
1786 }
1787
1788 void lightrec_invalidate(struct lightrec_state *state, u32 addr, u32 len)
1789 {
1790         u32 kaddr = kunseg(addr & ~0x3);
1791         enum psx_map idx = lightrec_get_map_idx(state, kaddr);
1792
1793         switch (idx) {
1794         case PSX_MAP_MIRROR1:
1795         case PSX_MAP_MIRROR2:
1796         case PSX_MAP_MIRROR3:
1797                 /* Handle mirrors */
1798                 kaddr &= RAM_SIZE - 1;
1799                 fallthrough;
1800         case PSX_MAP_KERNEL_USER_RAM:
1801                 break;
1802         default:
1803                 return;
1804         }
1805
1806         memset(lut_address(state, lut_offset(kaddr)), 0,
1807                ((len + 3) / 4) * lut_elm_size(state));
1808 }
1809
1810 void lightrec_invalidate_all(struct lightrec_state *state)
1811 {
1812         memset(state->code_lut, 0, lut_elm_size(state) * CODE_LUT_SIZE);
1813 }
1814
1815 void lightrec_set_invalidate_mode(struct lightrec_state *state, bool dma_only)
1816 {
1817         if (state->invalidate_from_dma_only != dma_only)
1818                 lightrec_invalidate_all(state);
1819
1820         state->invalidate_from_dma_only = dma_only;
1821 }
1822
1823 void lightrec_set_exit_flags(struct lightrec_state *state, u32 flags)
1824 {
1825         if (flags != LIGHTREC_EXIT_NORMAL) {
1826                 state->exit_flags |= flags;
1827                 state->target_cycle = state->current_cycle;
1828         }
1829 }
1830
1831 u32 lightrec_exit_flags(struct lightrec_state *state)
1832 {
1833         return state->exit_flags;
1834 }
1835
1836 u32 lightrec_current_cycle_count(const struct lightrec_state *state)
1837 {
1838         return state->current_cycle;
1839 }
1840
1841 void lightrec_reset_cycle_count(struct lightrec_state *state, u32 cycles)
1842 {
1843         state->current_cycle = cycles;
1844
1845         if (state->target_cycle < cycles)
1846                 state->target_cycle = cycles;
1847 }
1848
1849 void lightrec_set_target_cycle_count(struct lightrec_state *state, u32 cycles)
1850 {
1851         if (state->exit_flags == LIGHTREC_EXIT_NORMAL) {
1852                 if (cycles < state->current_cycle)
1853                         cycles = state->current_cycle;
1854
1855                 state->target_cycle = cycles;
1856         }
1857 }
1858
1859 struct lightrec_registers * lightrec_get_registers(struct lightrec_state *state)
1860 {
1861         return &state->regs;
1862 }