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
  20 #include <errno.h>
  21 #include <inttypes.h>
  22 #include <limits.h>
  23 #if ENABLE_THREADED_COMPILER
  24 #include <stdatomic.h>
  25 #endif
  26 #include <stdbool.h>
  27 #include <stddef.h>
  28 #include <string.h>
  29 #if ENABLE_TINYMM
  30 #include <tinymm.h>
  31 #endif
  32
  33 #define GENMASK(h, l) \
  34         (((uintptr_t)-1 << (l)) & ((uintptr_t)-1 >> (__WORDSIZE - 1 - (h))))
  35
  36 static struct block * lightrec_precompile_block(struct lightrec_state *state,
  37                                                 u32 pc);
  38 static bool lightrec_block_is_fully_tagged(const struct block *block);
  39
  40 static void lightrec_mtc2(struct lightrec_state *state, u8 reg, u32 data);
  41 static u32 lightrec_mfc2(struct lightrec_state *state, u8 reg);
  42
  43 static void lightrec_default_sb(struct lightrec_state *state, u32 opcode,
  44                                 void *host, u32 addr, u8 data)
  45 {
  46         *(u8 *)host = data;
  47
  48         if (!state->invalidate_from_dma_only)
  49                 lightrec_invalidate(state, addr, 1);
  50 }
  51
  52 static void lightrec_default_sh(struct lightrec_state *state, u32 opcode,
  53                                 void *host, u32 addr, u16 data)
  54 {
  55         *(u16 *)host = HTOLE16(data);
  56
  57         if (!state->invalidate_from_dma_only)
  58                 lightrec_invalidate(state, addr, 2);
  59 }
  60
  61 static void lightrec_default_sw(struct lightrec_state *state, u32 opcode,
  62                                 void *host, u32 addr, u32 data)
  63 {
  64         *(u32 *)host = HTOLE32(data);
  65
  66         if (!state->invalidate_from_dma_only)
  67                 lightrec_invalidate(state, addr, 4);
  68 }
  69
  70 static u8 lightrec_default_lb(struct lightrec_state *state,
  71                               u32 opcode, void *host, u32 addr)
  72 {
  73         return *(u8 *)host;
  74 }
  75
  76 static u16 lightrec_default_lh(struct lightrec_state *state,
  77                                u32 opcode, void *host, u32 addr)
  78 {
  79         return LE16TOH(*(u16 *)host);
  80 }
  81
  82 static u32 lightrec_default_lw(struct lightrec_state *state,
  83                                u32 opcode, void *host, u32 addr)
  84 {
  85         return LE32TOH(*(u32 *)host);
  86 }
  87
  88 static const struct lightrec_mem_map_ops lightrec_default_ops = {
  89         .sb = lightrec_default_sb,
  90         .sh = lightrec_default_sh,
  91         .sw = lightrec_default_sw,
  92         .lb = lightrec_default_lb,
  93         .lh = lightrec_default_lh,
  94         .lw = lightrec_default_lw,
  95 };
  96
  97 static void __segfault_cb(struct lightrec_state *state, u32 addr,
  98                           const struct block *block)
  99 {
 100         lightrec_set_exit_flags(state, LIGHTREC_EXIT_SEGFAULT);
 101         pr_err("Segmentation fault in recompiled code: invalid "
 102                "load/store at address 0x%08x\n", addr);
 103         if (block)
 104                 pr_err("Was executing block PC 0x%08x\n", block->pc);
 105 }
 106
 107 static void lightrec_swl(struct lightrec_state *state,
 108                          const struct lightrec_mem_map_ops *ops,
 109                          u32 opcode, void *host, u32 addr, u32 data)
 110 {
 111         unsigned int shift = addr & 0x3;
 112         unsigned int mask = GENMASK(31, (shift + 1) * 8);
 113         u32 old_data;
 114
 115         /* Align to 32 bits */
 116         addr &= ~3;
 117         host = (void *)((uintptr_t)host & ~3);
 118
 119         old_data = ops->lw(state, opcode, host, addr);
 120
 121         data = (data >> ((3 - shift) * 8)) | (old_data & mask);
 122
 123         ops->sw(state, opcode, host, addr, data);
 124 }
 125
 126 static void lightrec_swr(struct lightrec_state *state,
 127                          const struct lightrec_mem_map_ops *ops,
 128                          u32 opcode, void *host, u32 addr, u32 data)
 129 {
 130         unsigned int shift = addr & 0x3;
 131         unsigned int mask = (1 << (shift * 8)) - 1;
 132         u32 old_data;
 133
 134         /* Align to 32 bits */
 135         addr &= ~3;
 136         host = (void *)((uintptr_t)host & ~3);
 137
 138         old_data = ops->lw(state, opcode, host, addr);
 139
 140         data = (data << (shift * 8)) | (old_data & mask);
 141
 142         ops->sw(state, opcode, host, addr, data);
 143 }
 144
 145 static void lightrec_swc2(struct lightrec_state *state, union code op,
 146                           const struct lightrec_mem_map_ops *ops,
 147                           void *host, u32 addr)
 148 {
 149         u32 data = lightrec_mfc2(state, op.i.rt);
 150
 151         ops->sw(state, op.opcode, host, addr, data);
 152 }
 153
 154 static u32 lightrec_lwl(struct lightrec_state *state,
 155                         const struct lightrec_mem_map_ops *ops,
 156                         u32 opcode, void *host, u32 addr, u32 data)
 157 {
 158         unsigned int shift = addr & 0x3;
 159         unsigned int mask = (1 << (24 - shift * 8)) - 1;
 160         u32 old_data;
 161
 162         /* Align to 32 bits */
 163         addr &= ~3;
 164         host = (void *)((uintptr_t)host & ~3);
 165
 166         old_data = ops->lw(state, opcode, host, addr);
 167
 168         return (data & mask) | (old_data << (24 - shift * 8));
 169 }
 170
 171 static u32 lightrec_lwr(struct lightrec_state *state,
 172                         const struct lightrec_mem_map_ops *ops,
 173                         u32 opcode, void *host, u32 addr, u32 data)
 174 {
 175         unsigned int shift = addr & 0x3;
 176         unsigned int mask = GENMASK(31, 32 - shift * 8);
 177         u32 old_data;
 178
 179         /* Align to 32 bits */
 180         addr &= ~3;
 181         host = (void *)((uintptr_t)host & ~3);
 182
 183         old_data = ops->lw(state, opcode, host, addr);
 184
 185         return (data & mask) | (old_data >> (shift * 8));
 186 }
 187
 188 static void lightrec_lwc2(struct lightrec_state *state, union code op,
 189                           const struct lightrec_mem_map_ops *ops,
 190                           void *host, u32 addr)
 191 {
 192         u32 data = ops->lw(state, op.opcode, host, addr);
 193
 194         lightrec_mtc2(state, op.i.rt, data);
 195 }
 196
 197 static void lightrec_invalidate_map(struct lightrec_state *state,
 198                 const struct lightrec_mem_map *map, u32 addr, u32 len)
 199 {
 200         if (map == &state->maps[PSX_MAP_KERNEL_USER_RAM]) {
 201                 memset(&state->code_lut[lut_offset(addr)], 0,
 202                        ((len + 3) / 4) * sizeof(void *));
 203         }
 204 }
 205
 206 const struct lightrec_mem_map *
 207 lightrec_get_map(struct lightrec_state *state, void **host, u32 kaddr)
 208 {
 209         const struct lightrec_mem_map *map;
 210         unsigned int i;
 211         u32 addr;
 212
 213         for (i = 0; i < state->nb_maps; i++) {
 214                 const struct lightrec_mem_map *mapi = &state->maps[i];
 215
 216                 if (kaddr >= mapi->pc && kaddr < mapi->pc + mapi->length) {
 217                         map = mapi;
 218                         break;
 219                 }
 220         }
 221
 222         if (i == state->nb_maps)
 223                 return NULL;
 224
 225         addr = kaddr - map->pc;
 226
 227         while (map->mirror_of)
 228                 map = map->mirror_of;
 229
 230         if (host)
 231                 *host = map->address + addr;
 232
 233         return map;
 234 }
 235
 236 u32 lightrec_rw(struct lightrec_state *state, union code op,
 237                 u32 addr, u32 data, u16 *flags, struct block *block)
 238 {
 239         const struct lightrec_mem_map *map;
 240         const struct lightrec_mem_map_ops *ops;
 241         u32 opcode = op.opcode;
 242         void *host;
 243
 244         addr += (s16) op.i.imm;
 245
 246         map = lightrec_get_map(state, &host, kunseg(addr));
 247         if (!map) {
 248                 __segfault_cb(state, addr, block);
 249                 return 0;
 250         }
 251
 252         if (unlikely(map->ops)) {
 253                 if (flags)
 254                         *flags |= LIGHTREC_HW_IO;
 255
 256                 ops = map->ops;
 257         } else {
 258                 if (flags)
 259                         *flags |= LIGHTREC_DIRECT_IO;
 260
 261                 ops = &lightrec_default_ops;
 262         }
 263
 264         switch (op.i.op) {
 265         case OP_SB:
 266                 ops->sb(state, opcode, host, addr, (u8) data);
 267                 return 0;
 268         case OP_SH:
 269                 ops->sh(state, opcode, host, addr, (u16) data);
 270                 return 0;
 271         case OP_SWL:
 272                 lightrec_swl(state, ops, opcode, host, addr, data);
 273                 return 0;
 274         case OP_SWR:
 275                 lightrec_swr(state, ops, opcode, host, addr, data);
 276                 return 0;
 277         case OP_SW:
 278                 ops->sw(state, opcode, host, addr, data);
 279                 return 0;
 280         case OP_SWC2:
 281                 lightrec_swc2(state, op, ops, host, addr);
 282                 return 0;
 283         case OP_LB:
 284                 return (s32) (s8) ops->lb(state, opcode, host, addr);
 285         case OP_LBU:
 286                 return ops->lb(state, opcode, host, addr);
 287         case OP_LH:
 288                 return (s32) (s16) ops->lh(state, opcode, host, addr);
 289         case OP_LHU:
 290                 return ops->lh(state, opcode, host, addr);
 291         case OP_LWC2:
 292                 lightrec_lwc2(state, op, ops, host, addr);
 293                 return 0;
 294         case OP_LWL:
 295                 return lightrec_lwl(state, ops, opcode, host, addr, data);
 296         case OP_LWR:
 297                 return lightrec_lwr(state, ops, opcode, host, addr, data);
 298         case OP_LW:
 299         default:
 300                 return ops->lw(state, opcode, host, addr);
 301         }
 302 }
 303
 304 static void lightrec_rw_helper(struct lightrec_state *state,
 305                                union code op, u16 *flags,
 306                                struct block *block)
 307 {
 308         u32 ret = lightrec_rw(state, op, state->regs.gpr[op.i.rs],
 309                               state->regs.gpr[op.i.rt], flags, block);
 310
 311         switch (op.i.op) {
 312         case OP_LB:
 313         case OP_LBU:
 314         case OP_LH:
 315         case OP_LHU:
 316         case OP_LWL:
 317         case OP_LWR:
 318         case OP_LW:
 319                 if (op.i.rt)
 320                         state->regs.gpr[op.i.rt] = ret;
 321         default: /* fall-through */
 322                 break;
 323         }
 324 }
 325
 326 static void lightrec_rw_cb(struct lightrec_state *state, union code op)
 327 {
 328         lightrec_rw_helper(state, op, NULL, NULL);
 329 }
 330
 331 static void lightrec_rw_generic_cb(struct lightrec_state *state, u32 arg)
 332 {
 333         struct block *block;
 334         struct opcode *op;
 335         bool was_tagged;
 336         u16 offset = (u16)arg;
 337
 338         block = lightrec_find_block_from_lut(state->block_cache,
 339                                              arg >> 16, state->next_pc);
 340         if (unlikely(!block)) {
 341                 pr_err("rw_generic: No block found in LUT for PC 0x%x offset 0x%x\n",
 342                          state->next_pc, offset);
 343                 return;
 344         }
 345
 346         op = &block->opcode_list[offset];
 347         was_tagged = op->flags & (LIGHTREC_HW_IO | LIGHTREC_DIRECT_IO);
 348
 349         lightrec_rw_helper(state, op->c, &op->flags, block);
 350
 351         if (!was_tagged) {
 352                 pr_debug("Opcode of block at PC 0x%08x has been tagged - flag "
 353                          "for recompilation\n", block->pc);
 354
 355                 block->flags |= BLOCK_SHOULD_RECOMPILE;
 356         }
 357 }
 358
 359 static u32 clamp_s32(s32 val, s32 min, s32 max)
 360 {
 361         return val < min ? min : val > max ? max : val;
 362 }
 363
 364 static u32 lightrec_mfc2(struct lightrec_state *state, u8 reg)
 365 {
 366         s16 gteir1, gteir2, gteir3;
 367
 368         switch (reg) {
 369         case 1:
 370         case 3:
 371         case 5:
 372         case 8:
 373         case 9:
 374         case 10:
 375         case 11:
 376                 return (s32)(s16) state->regs.cp2d[reg];
 377         case 7:
 378         case 16:
 379         case 17:
 380         case 18:
 381         case 19:
 382                 return (u16) state->regs.cp2d[reg];
 383         case 28:
 384         case 29:
 385                 gteir1 = (s16) state->regs.cp2d[9];
 386                 gteir2 = (s16) state->regs.cp2d[10];
 387                 gteir3 = (s16) state->regs.cp2d[11];
 388
 389                 return clamp_s32(gteir1 >> 7, 0, 0x1f) << 0 |
 390                         clamp_s32(gteir2 >> 7, 0, 0x1f) << 5 |
 391                         clamp_s32(gteir3 >> 7, 0, 0x1f) << 10;
 392         case 15:
 393                 reg = 14;
 394         default: /* fall-through */
 395                 return state->regs.cp2d[reg];
 396         }
 397 }
 398
 399 u32 lightrec_mfc(struct lightrec_state *state, union code op)
 400 {
 401         if (op.i.op == OP_CP0)
 402                 return state->regs.cp0[op.r.rd];
 403         else if (op.r.rs == OP_CP2_BASIC_MFC2)
 404                 return lightrec_mfc2(state, op.r.rd);
 405         else
 406                 return state->regs.cp2c[op.r.rd];
 407 }
 408
 409 static void lightrec_mfc_cb(struct lightrec_state *state, union code op)
 410 {
 411         u32 rt = lightrec_mfc(state, op);
 412
 413         if (op.r.rt)
 414                 state->regs.gpr[op.r.rt] = rt;
 415 }
 416
 417 static void lightrec_mtc0(struct lightrec_state *state, u8 reg, u32 data)
 418 {
 419         u32 status, cause;
 420
 421         switch (reg) {
 422         case 1:
 423         case 4:
 424         case 8:
 425         case 14:
 426         case 15:
 427                 /* Those registers are read-only */
 428                 return;
 429         default: /* fall-through */
 430                 break;
 431         }
 432
 433         if (reg == 12) {
 434                 status = state->regs.cp0[12];
 435
 436                 if (status & ~data & BIT(16)) {
 437                         state->ops.enable_ram(state, true);
 438                         lightrec_invalidate_all(state);
 439                 } else if (~status & data & BIT(16)) {
 440                         state->ops.enable_ram(state, false);
 441                 }
 442         }
 443
 444         state->regs.cp0[reg] = data;
 445
 446         if (reg == 12 || reg == 13) {
 447                 cause = state->regs.cp0[13];
 448                 status = state->regs.cp0[12];
 449
 450                 if (!!(status & cause & 0x300) & status)
 451                         lightrec_set_exit_flags(state, LIGHTREC_EXIT_CHECK_INTERRUPT);
 452         }
 453 }
 454
 455 static u32 count_leading_bits(s32 data)
 456 {
 457 #if defined(__has_builtin) && __has_builtin(__builtin_clrsb)
 458         return 1 + __builtin_clrsb(data);
 459 #else
 460         u32 cnt = 33;
 461
 462         data = (data ^ (data >> 31)) << 1;
 463
 464         do {
 465                 cnt -= 1;
 466                 data >>= 1;
 467         } while (data);
 468
 469         return cnt;
 470 #endif
 471 }
 472
 473 static void lightrec_mtc2(struct lightrec_state *state, u8 reg, u32 data)
 474 {
 475         switch (reg) {
 476         case 15:
 477                 state->regs.cp2d[12] = state->regs.cp2d[13];
 478                 state->regs.cp2d[13] = state->regs.cp2d[14];
 479                 state->regs.cp2d[14] = data;
 480                 break;
 481         case 28:
 482                 state->regs.cp2d[9] = (data << 7) & 0xf80;
 483                 state->regs.cp2d[10] = (data << 2) & 0xf80;
 484                 state->regs.cp2d[11] = (data >> 3) & 0xf80;
 485                 break;
 486         case 31:
 487                 return;
 488         case 30:
 489                 state->regs.cp2d[31] = count_leading_bits((s32) data);
 490         default: /* fall-through */
 491                 state->regs.cp2d[reg] = data;
 492                 break;
 493         }
 494 }
 495
 496 static void lightrec_ctc2(struct lightrec_state *state, u8 reg, u32 data)
 497 {
 498         switch (reg) {
 499         case 4:
 500         case 12:
 501         case 20:
 502         case 26:
 503         case 27:
 504         case 29:
 505         case 30:
 506                 data = (s32)(s16) data;
 507                 break;
 508         case 31:
 509                 data = (data & 0x7ffff000) | !!(data & 0x7f87e000) << 31;
 510         default: /* fall-through */
 511                 break;
 512         }
 513
 514         state->regs.cp2c[reg] = data;
 515 }
 516
 517 void lightrec_mtc(struct lightrec_state *state, union code op, u32 data)
 518 {
 519         if (op.i.op == OP_CP0)
 520                 lightrec_mtc0(state, op.r.rd, data);
 521         else if (op.r.rs == OP_CP2_BASIC_CTC2)
 522                 lightrec_ctc2(state, op.r.rd, data);
 523         else
 524                 lightrec_mtc2(state, op.r.rd, data);
 525 }
 526
 527 static void lightrec_mtc_cb(struct lightrec_state *state, union code op)
 528 {
 529         lightrec_mtc(state, op, state->regs.gpr[op.r.rt]);
 530 }
 531
 532 void lightrec_rfe(struct lightrec_state *state)
 533 {
 534         u32 status;
 535
 536         /* Read CP0 Status register (r12) */
 537         status = state->regs.cp0[12];
 538
 539         /* Switch the bits */
 540         status = ((status & 0x3c) >> 2) | (status & ~0xf);
 541
 542         /* Write it back */
 543         lightrec_mtc0(state, 12, status);
 544 }
 545
 546 void lightrec_cp(struct lightrec_state *state, union code op)
 547 {
 548         if (op.i.op == OP_CP0) {
 549                 pr_err("Invalid CP opcode to coprocessor #0\n");
 550                 return;
 551         }
 552
 553         (*state->ops.cop2_op)(state, op.opcode);
 554 }
 555
 556 static void lightrec_syscall_cb(struct lightrec_state *state, union code op)
 557 {
 558         lightrec_set_exit_flags(state, LIGHTREC_EXIT_SYSCALL);
 559 }
 560
 561 static void lightrec_break_cb(struct lightrec_state *state, union code op)
 562 {
 563         lightrec_set_exit_flags(state, LIGHTREC_EXIT_BREAK);
 564 }
 565
 566 struct block * lightrec_get_block(struct lightrec_state *state, u32 pc)
 567 {
 568         struct block *block = lightrec_find_block(state->block_cache, pc);
 569
 570         if (block && lightrec_block_is_outdated(state, block)) {
 571                 pr_debug("Block at PC 0x%08x is outdated!\n", block->pc);
 572
 573                 /* Make sure the recompiler isn't processing the block we'll
 574                  * destroy */
 575                 if (ENABLE_THREADED_COMPILER)
 576                         lightrec_recompiler_remove(state->rec, block);
 577
 578                 lightrec_unregister_block(state->block_cache, block);
 579                 remove_from_code_lut(state->block_cache, block);
 580                 lightrec_free_block(state, block);
 581                 block = NULL;
 582         }
 583
 584         if (!block) {
 585                 block = lightrec_precompile_block(state, pc);
 586                 if (!block) {
 587                         pr_err("Unable to recompile block at PC 0x%x\n", pc);
 588                         lightrec_set_exit_flags(state, LIGHTREC_EXIT_SEGFAULT);
 589                         return NULL;
 590                 }
 591
 592                 lightrec_register_block(state->block_cache, block);
 593         }
 594
 595         return block;
 596 }
 597
 598 static void * get_next_block_func(struct lightrec_state *state, u32 pc)
 599 {
 600         struct block *block;
 601         bool should_recompile;
 602         void *func;
 603
 604         for (;;) {
 605                 func = state->code_lut[lut_offset(pc)];
 606                 if (func && func != state->get_next_block)
 607                         break;
 608
 609                 block = lightrec_get_block(state, pc);
 610
 611                 if (unlikely(!block))
 612                         break;
 613
 614                 if (OPT_REPLACE_MEMSET && (block->flags & BLOCK_IS_MEMSET)) {
 615                         func = state->memset_func;
 616                         break;
 617                 }
 618
 619                 should_recompile = block->flags & BLOCK_SHOULD_RECOMPILE &&
 620                         !(block->flags & BLOCK_IS_DEAD);
 621
 622                 if (unlikely(should_recompile)) {
 623                         pr_debug("Block at PC 0x%08x should recompile\n", pc);
 624
 625                         lightrec_unregister(MEM_FOR_CODE, block->code_size);
 626
 627                         if (ENABLE_THREADED_COMPILER)
 628                                 lightrec_recompiler_add(state->rec, block);
 629                         else
 630                                 lightrec_compile_block(state->cstate, block);
 631                 }
 632
 633                 if (ENABLE_THREADED_COMPILER && likely(!should_recompile))
 634                         func = lightrec_recompiler_run_first_pass(state, block, &pc);
 635                 else
 636                         func = block->function;
 637
 638                 if (likely(func))
 639                         break;
 640
 641                 if (unlikely(block->flags & BLOCK_NEVER_COMPILE)) {
 642                         pc = lightrec_emulate_block(state, block, pc);
 643
 644                 } else if (!ENABLE_THREADED_COMPILER) {
 645                         /* Block wasn't compiled yet - run the interpreter */
 646                         if (block->flags & BLOCK_FULLY_TAGGED)
 647                                 pr_debug("Block fully tagged, skipping first pass\n");
 648                         else if (ENABLE_FIRST_PASS && likely(!should_recompile))
 649                                 pc = lightrec_emulate_block(state, block, pc);
 650
 651                         /* Then compile it using the profiled data */
 652                         lightrec_compile_block(state->cstate, block);
 653                 } else {
 654                         lightrec_recompiler_add(state->rec, block);
 655                 }
 656
 657                 if (state->exit_flags != LIGHTREC_EXIT_NORMAL ||
 658                     state->current_cycle >= state->target_cycle)
 659                         break;
 660         }
 661
 662         state->next_pc = pc;
 663         return func;
 664 }
 665
 666 static s32 c_function_wrapper(struct lightrec_state *state, s32 cycles_delta,
 667                               void (*f)(struct lightrec_state *, u32 d),
 668                               u32 d)
 669 {
 670         state->current_cycle = state->target_cycle - cycles_delta;
 671
 672         (*f)(state, d);
 673
 674         return state->target_cycle - state->current_cycle;
 675 }
 676
 677 static struct block * generate_wrapper(struct lightrec_state *state)
 678 {
 679         struct block *block;
 680         jit_state_t *_jit;
 681         unsigned int i;
 682         int stack_ptr;
 683         jit_word_t code_size;
 684         jit_node_t *to_tramp, *to_fn_epilog;
 685
 686         block = lightrec_malloc(state, MEM_FOR_IR, sizeof(*block));
 687         if (!block)
 688                 goto err_no_mem;
 689
 690         _jit = jit_new_state();
 691         if (!_jit)
 692                 goto err_free_block;
 693
 694         jit_name("RW wrapper");
 695         jit_note(__FILE__, __LINE__);
 696
 697         /* Wrapper entry point */
 698         jit_prolog();
 699
 700         stack_ptr = jit_allocai(sizeof(uintptr_t) * NUM_TEMPS);
 701
 702         for (i = 0; i < NUM_TEMPS; i++)
 703                 jit_stxi(stack_ptr + i * sizeof(uintptr_t), JIT_FP, JIT_R(i));
 704
 705         /* Jump to the trampoline */
 706         to_tramp = jit_jmpi();
 707
 708         /* The trampoline will jump back here */
 709         to_fn_epilog = jit_label();
 710
 711         for (i = 0; i < NUM_TEMPS; i++)
 712                 jit_ldxi(JIT_R(i), JIT_FP, stack_ptr + i * sizeof(uintptr_t));
 713
 714         jit_ret();
 715         jit_epilog();
 716
 717         /* Trampoline entry point.
 718          * The sole purpose of the trampoline is to cheese Lightning not to
 719          * save/restore the callee-saved register LIGHTREC_REG_CYCLE, since we
 720          * do want to return to the caller with this register modified. */
 721         jit_prolog();
 722         jit_tramp(256);
 723         jit_patch(to_tramp);
 724
 725         jit_prepare();
 726         jit_pushargr(LIGHTREC_REG_STATE);
 727         jit_pushargr(LIGHTREC_REG_CYCLE);
 728         jit_pushargr(JIT_R0);
 729         jit_pushargr(JIT_R1);
 730         jit_finishi(c_function_wrapper);
 731         jit_retval_i(LIGHTREC_REG_CYCLE);
 732
 733         jit_patch_at(jit_jmpi(), to_fn_epilog);
 734         jit_epilog();
 735
 736         block->_jit = _jit;
 737         block->function = jit_emit();
 738         block->opcode_list = NULL;
 739         block->flags = 0;
 740         block->nb_ops = 0;
 741
 742         jit_get_code(&code_size);
 743         lightrec_register(MEM_FOR_CODE, code_size);
 744
 745         block->code_size = code_size;
 746
 747         if (ENABLE_DISASSEMBLER) {
 748                 pr_debug("Wrapper block:\n");
 749                 jit_disassemble();
 750         }
 751
 752         jit_clear_state();
 753         return block;
 754
 755 err_free_block:
 756         lightrec_free(state, MEM_FOR_IR, sizeof(*block), block);
 757 err_no_mem:
 758         pr_err("Unable to compile wrapper: Out of memory\n");
 759         return NULL;
 760 }
 761
 762 static u32 lightrec_memset(struct lightrec_state *state)
 763 {
 764         u32 kunseg_pc = kunseg(state->regs.gpr[4]);
 765         void *host;
 766         const struct lightrec_mem_map *map = lightrec_get_map(state, &host, kunseg_pc);
 767         u32 length = state->regs.gpr[5] * 4;
 768
 769         if (!map) {
 770                 pr_err("Unable to find memory map for memset target address "
 771                        "0x%x\n", kunseg_pc);
 772                 return 0;
 773         }
 774
 775         pr_debug("Calling host memset, PC 0x%x (host address 0x%" PRIxPTR ") for %u bytes\n",
 776                  kunseg_pc, (uintptr_t)host, length);
 777         memset(host, 0, length);
 778
 779         if (!state->invalidate_from_dma_only)
 780                 lightrec_invalidate_map(state, map, kunseg_pc, length);
 781
 782         /* Rough estimation of the number of cycles consumed */
 783         return 8 + 5 * (length  + 3 / 4);
 784 }
 785
 786 static struct block * generate_dispatcher(struct lightrec_state *state)
 787 {
 788         struct block *block;
 789         jit_state_t *_jit;
 790         jit_node_t *to_end, *to_c, *loop, *addr, *addr2, *addr3;
 791         unsigned int i;
 792         u32 offset, ram_len;
 793         jit_word_t code_size;
 794
 795         block = lightrec_malloc(state, MEM_FOR_IR, sizeof(*block));
 796         if (!block)
 797                 goto err_no_mem;
 798
 799         _jit = jit_new_state();
 800         if (!_jit)
 801                 goto err_free_block;
 802
 803         jit_name("dispatcher");
 804         jit_note(__FILE__, __LINE__);
 805
 806         jit_prolog();
 807         jit_frame(256);
 808
 809         jit_getarg(JIT_R0, jit_arg());
 810         jit_getarg_i(LIGHTREC_REG_CYCLE, jit_arg());
 811
 812         /* Force all callee-saved registers to be pushed on the stack */
 813         for (i = 0; i < NUM_REGS; i++)
 814                 jit_movr(JIT_V(i), JIT_V(i));
 815
 816         /* Pass lightrec_state structure to blocks, using the last callee-saved
 817          * register that Lightning provides */
 818         jit_movi(LIGHTREC_REG_STATE, (intptr_t) state);
 819
 820         loop = jit_label();
 821
 822         /* Call the block's code */
 823         jit_jmpr(JIT_R0);
 824
 825         if (OPT_REPLACE_MEMSET) {
 826                 /* Blocks will jump here when they need to call
 827                  * lightrec_memset() */
 828                 addr3 = jit_indirect();
 829
 830                 jit_prepare();
 831                 jit_pushargr(LIGHTREC_REG_STATE);
 832                 jit_finishi(lightrec_memset);
 833
 834                 jit_ldxi_ui(JIT_V0, LIGHTREC_REG_STATE,
 835                             offsetof(struct lightrec_state, regs.gpr[31]));
 836
 837                 jit_retval(JIT_R0);
 838                 jit_subr(LIGHTREC_REG_CYCLE, LIGHTREC_REG_CYCLE, JIT_R0);
 839         }
 840
 841         /* The block will jump here, with the number of cycles remaining in
 842          * LIGHTREC_REG_CYCLE */
 843         addr2 = jit_indirect();
 844
 845         /* Store back the next_pc to the lightrec_state structure */
 846         offset = offsetof(struct lightrec_state, next_pc);
 847         jit_stxi_i(offset, LIGHTREC_REG_STATE, JIT_V0);
 848
 849         /* Jump to end if state->target_cycle < state->current_cycle */
 850         to_end = jit_blei(LIGHTREC_REG_CYCLE, 0);
 851
 852         /* Convert next PC to KUNSEG and avoid mirrors */
 853         ram_len = state->maps[PSX_MAP_KERNEL_USER_RAM].length;
 854         jit_andi(JIT_R0, JIT_V0, 0x10000000 | (ram_len - 1));
 855         to_c = jit_bgei(JIT_R0, ram_len);
 856
 857         /* Fast path: code is running from RAM, use the code LUT */
 858         if (__WORDSIZE == 64)
 859                 jit_lshi(JIT_R0, JIT_R0, 1);
 860         jit_addr(JIT_R0, JIT_R0, LIGHTREC_REG_STATE);
 861         jit_ldxi(JIT_R0, JIT_R0, offsetof(struct lightrec_state, code_lut));
 862
 863         /* If we get non-NULL, loop */
 864         jit_patch_at(jit_bnei(JIT_R0, 0), loop);
 865
 866         /* Slow path: call C function get_next_block_func() */
 867         jit_patch(to_c);
 868
 869         if (ENABLE_FIRST_PASS || OPT_DETECT_IMPOSSIBLE_BRANCHES) {
 870                 /* We may call the interpreter - update state->current_cycle */
 871                 jit_ldxi_i(JIT_R2, LIGHTREC_REG_STATE,
 872                            offsetof(struct lightrec_state, target_cycle));
 873                 jit_subr(JIT_R1, JIT_R2, LIGHTREC_REG_CYCLE);
 874                 jit_stxi_i(offsetof(struct lightrec_state, current_cycle),
 875                            LIGHTREC_REG_STATE, JIT_R1);
 876         }
 877
 878         /* The code LUT will be set to this address when the block at the target
 879          * PC has been preprocessed but not yet compiled by the threaded
 880          * recompiler */
 881         addr = jit_indirect();
 882
 883         /* Get the next block */
 884         jit_prepare();
 885         jit_pushargr(LIGHTREC_REG_STATE);
 886         jit_pushargr(JIT_V0);
 887         jit_finishi(&get_next_block_func);
 888         jit_retval(JIT_R0);
 889
 890         if (ENABLE_FIRST_PASS || OPT_DETECT_IMPOSSIBLE_BRANCHES) {
 891                 /* The interpreter may have updated state->current_cycle and
 892                  * state->target_cycle - recalc the delta */
 893                 jit_ldxi_i(JIT_R1, LIGHTREC_REG_STATE,
 894                            offsetof(struct lightrec_state, current_cycle));
 895                 jit_ldxi_i(JIT_R2, LIGHTREC_REG_STATE,
 896                            offsetof(struct lightrec_state, target_cycle));
 897                 jit_subr(LIGHTREC_REG_CYCLE, JIT_R2, JIT_R1);
 898         }
 899
 900         /* If we get non-NULL, loop */
 901         jit_patch_at(jit_bnei(JIT_R0, 0), loop);
 902
 903         /* When exiting, the recompiled code will jump to that address */
 904         jit_note(__FILE__, __LINE__);
 905         jit_patch(to_end);
 906
 907         jit_retr(LIGHTREC_REG_CYCLE);
 908         jit_epilog();
 909
 910         block->_jit = _jit;
 911         block->function = jit_emit();
 912         block->opcode_list = NULL;
 913         block->flags = 0;
 914         block->nb_ops = 0;
 915
 916         jit_get_code(&code_size);
 917         lightrec_register(MEM_FOR_CODE, code_size);
 918
 919         block->code_size = code_size;
 920
 921         state->eob_wrapper_func = jit_address(addr2);
 922         if (OPT_REPLACE_MEMSET)
 923                 state->memset_func = jit_address(addr3);
 924         state->get_next_block = jit_address(addr);
 925
 926         if (ENABLE_DISASSEMBLER) {
 927                 pr_debug("Dispatcher block:\n");
 928                 jit_disassemble();
 929         }
 930
 931         /* We're done! */
 932         jit_clear_state();
 933         return block;
 934
 935 err_free_block:
 936         lightrec_free(state, MEM_FOR_IR, sizeof(*block), block);
 937 err_no_mem:
 938         pr_err("Unable to compile dispatcher: Out of memory\n");
 939         return NULL;
 940 }
 941
 942 union code lightrec_read_opcode(struct lightrec_state *state, u32 pc)
 943 {
 944         void *host;
 945
 946         lightrec_get_map(state, &host, kunseg(pc));
 947
 948         const u32 *code = (u32 *)host;
 949         return (union code) *code;
 950 }
 951
 952 unsigned int lightrec_cycles_of_opcode(union code code)
 953 {
 954         return 2;
 955 }
 956
 957 void lightrec_free_opcode_list(struct lightrec_state *state, struct block *block)
 958 {
 959         lightrec_free(state, MEM_FOR_IR,
 960                       sizeof(*block->opcode_list) * block->nb_ops,
 961                       block->opcode_list);
 962 }
 963
 964 static unsigned int lightrec_get_mips_block_len(const u32 *src)
 965 {
 966         unsigned int i;
 967         union code c;
 968
 969         for (i = 1; ; i++) {
 970                 c.opcode = LE32TOH(*src++);
 971
 972                 if (is_syscall(c))
 973                         return i;
 974
 975                 if (is_unconditional_jump(c))
 976                         return i + 1;
 977         }
 978 }
 979
 980 static struct opcode * lightrec_disassemble(struct lightrec_state *state,
 981                                             const u32 *src, unsigned int *len)
 982 {
 983         struct opcode *list;
 984         unsigned int i, length;
 985
 986         length = lightrec_get_mips_block_len(src);
 987
 988         list = lightrec_malloc(state, MEM_FOR_IR, sizeof(*list) * length);
 989         if (!list) {
 990                 pr_err("Unable to allocate memory\n");
 991                 return NULL;
 992         }
 993
 994         for (i = 0; i < length; i++) {
 995                 list[i].opcode = LE32TOH(src[i]);
 996                 list[i].flags = 0;
 997         }
 998
 999         *len = length * sizeof(u32);
1000
1001         return list;
1002 }
1003
1004 static struct block * lightrec_precompile_block(struct lightrec_state *state,
1005                                                 u32 pc)
1006 {
1007         struct opcode *list;
1008         struct block *block;
1009         void *host;
1010         const struct lightrec_mem_map *map = lightrec_get_map(state, &host, kunseg(pc));
1011         const u32 *code = (u32 *) host;
1012         unsigned int length;
1013         bool fully_tagged;
1014
1015         if (!map)
1016                 return NULL;
1017
1018         block = lightrec_malloc(state, MEM_FOR_IR, sizeof(*block));
1019         if (!block) {
1020                 pr_err("Unable to recompile block: Out of memory\n");
1021                 return NULL;
1022         }
1023
1024         list = lightrec_disassemble(state, code, &length);
1025         if (!list) {
1026                 lightrec_free(state, MEM_FOR_IR, sizeof(*block), block);
1027                 return NULL;
1028         }
1029
1030         block->pc = pc;
1031         block->_jit = NULL;
1032         block->function = NULL;
1033         block->opcode_list = list;
1034         block->code = code;
1035         block->next = NULL;
1036         block->flags = 0;
1037         block->code_size = 0;
1038 #if ENABLE_THREADED_COMPILER
1039         block->op_list_freed = (atomic_flag)ATOMIC_FLAG_INIT;
1040 #endif
1041         block->nb_ops = length / sizeof(u32);
1042
1043         lightrec_optimize(state, block);
1044
1045         length = block->nb_ops * sizeof(u32);
1046
1047         lightrec_register(MEM_FOR_MIPS_CODE, length);
1048
1049         if (ENABLE_DISASSEMBLER) {
1050                 pr_debug("Disassembled block at PC: 0x%08x\n", block->pc);
1051                 lightrec_print_disassembly(block, code);
1052         }
1053
1054         pr_debug("Block size: %hu opcodes\n", block->nb_ops);
1055
1056         /* If the first opcode is an 'impossible' branch, never compile the
1057          * block */
1058         if (should_emulate(block->opcode_list))
1059                 block->flags |= BLOCK_NEVER_COMPILE;
1060
1061         fully_tagged = lightrec_block_is_fully_tagged(block);
1062         if (fully_tagged)
1063                 block->flags |= BLOCK_FULLY_TAGGED;
1064
1065         if (OPT_REPLACE_MEMSET && (block->flags & BLOCK_IS_MEMSET))
1066                 state->code_lut[lut_offset(pc)] = state->memset_func;
1067
1068         block->hash = lightrec_calculate_block_hash(block);
1069
1070         pr_debug("Recompile count: %u\n", state->nb_precompile++);
1071
1072         return block;
1073 }
1074
1075 static bool lightrec_block_is_fully_tagged(const struct block *block)
1076 {
1077         const struct opcode *op;
1078         unsigned int i;
1079
1080         for (i = 0; i < block->nb_ops; i++) {
1081                 op = &block->opcode_list[i];
1082
1083                 /* Verify that all load/stores of the opcode list
1084                  * Check all loads/stores of the opcode list and mark the
1085                  * block as fully compiled if they all have been tagged. */
1086                 switch (op->c.i.op) {
1087                 case OP_LB:
1088                 case OP_LH:
1089                 case OP_LWL:
1090                 case OP_LW:
1091                 case OP_LBU:
1092                 case OP_LHU:
1093                 case OP_LWR:
1094                 case OP_SB:
1095                 case OP_SH:
1096                 case OP_SWL:
1097                 case OP_SW:
1098                 case OP_SWR:
1099                 case OP_LWC2:
1100                 case OP_SWC2:
1101                         if (!(op->flags & (LIGHTREC_DIRECT_IO |
1102                                            LIGHTREC_HW_IO)))
1103                                 return false;
1104                 default: /* fall-through */
1105                         continue;
1106                 }
1107         }
1108
1109         return true;
1110 }
1111
1112 static void lightrec_reap_block(struct lightrec_state *state, void *data)
1113 {
1114         struct block *block = data;
1115
1116         pr_debug("Reap dead block at PC 0x%08x\n", block->pc);
1117         lightrec_unregister_block(state->block_cache, block);
1118         lightrec_free_block(state, block);
1119 }
1120
1121 static void lightrec_reap_jit(struct lightrec_state *state, void *data)
1122 {
1123         _jit_destroy_state(data);
1124 }
1125
1126 int lightrec_compile_block(struct lightrec_cstate *cstate,
1127                            struct block *block)
1128 {
1129         struct lightrec_state *state = cstate->state;
1130         struct lightrec_branch_target *target;
1131         bool op_list_freed = false, fully_tagged = false;
1132         struct block *block2;
1133         struct opcode *elm;
1134         jit_state_t *_jit, *oldjit;
1135         jit_node_t *start_of_block;
1136         bool skip_next = false;
1137         jit_word_t code_size;
1138         unsigned int i, j;
1139         u32 offset;
1140
1141         fully_tagged = lightrec_block_is_fully_tagged(block);
1142         if (fully_tagged)
1143                 block->flags |= BLOCK_FULLY_TAGGED;
1144
1145         _jit = jit_new_state();
1146         if (!_jit)
1147                 return -ENOMEM;
1148
1149         oldjit = block->_jit;
1150         block->_jit = _jit;
1151
1152         lightrec_regcache_reset(cstate->reg_cache);
1153         cstate->cycles = 0;
1154         cstate->nb_branches = 0;
1155         cstate->nb_local_branches = 0;
1156         cstate->nb_targets = 0;
1157
1158         jit_prolog();
1159         jit_tramp(256);
1160
1161         start_of_block = jit_label();
1162
1163         for (i = 0; i < block->nb_ops; i++) {
1164                 elm = &block->opcode_list[i];
1165
1166                 if (skip_next) {
1167                         skip_next = false;
1168                         continue;
1169                 }
1170
1171                 cstate->cycles += lightrec_cycles_of_opcode(elm->c);
1172
1173                 if (should_emulate(elm)) {
1174                         pr_debug("Branch at offset 0x%x will be emulated\n",
1175                                  i << 2);
1176
1177                         lightrec_emit_eob(cstate, block, i, false);
1178                         skip_next = !(elm->flags & LIGHTREC_NO_DS);
1179                 } else {
1180                         lightrec_rec_opcode(cstate, block, i);
1181                         skip_next = has_delay_slot(elm->c) &&
1182                                 !(elm->flags & LIGHTREC_NO_DS);
1183 #if _WIN32
1184                         /* FIXME: GNU Lightning on Windows seems to use our
1185                          * mapped registers as temporaries. Until the actual bug
1186                          * is found and fixed, unconditionally mark our
1187                          * registers as live here. */
1188                         lightrec_regcache_mark_live(cstate->reg_cache, _jit);
1189 #endif
1190                 }
1191         }
1192
1193         for (i = 0; i < cstate->nb_branches; i++)
1194                 jit_patch(cstate->branches[i]);
1195
1196         for (i = 0; i < cstate->nb_local_branches; i++) {
1197                 struct lightrec_branch *branch = &cstate->local_branches[i];
1198
1199                 pr_debug("Patch local branch to offset 0x%x\n",
1200                          branch->target << 2);
1201
1202                 if (branch->target == 0) {
1203                         jit_patch_at(branch->branch, start_of_block);
1204                         continue;
1205                 }
1206
1207                 for (j = 0; j < cstate->nb_targets; j++) {
1208                         if (cstate->targets[j].offset == branch->target) {
1209                                 jit_patch_at(branch->branch,
1210                                              cstate->targets[j].label);
1211                                 break;
1212                         }
1213                 }
1214
1215                 if (j == cstate->nb_targets)
1216                         pr_err("Unable to find branch target\n");
1217         }
1218
1219         jit_ldxi(JIT_R0, LIGHTREC_REG_STATE,
1220                  offsetof(struct lightrec_state, eob_wrapper_func));
1221
1222         jit_jmpr(JIT_R0);
1223
1224         jit_ret();
1225         jit_epilog();
1226
1227         block->function = jit_emit();
1228         block->flags &= ~BLOCK_SHOULD_RECOMPILE;
1229
1230         /* Add compiled function to the LUT */
1231         state->code_lut[lut_offset(block->pc)] = block->function;
1232
1233         if (ENABLE_THREADED_COMPILER) {
1234                 /* Since we might try to reap the same block multiple times,
1235                  * we need the reaper to wait until everything has been
1236                  * submitted, so that the duplicate entries can be dropped. */
1237                 lightrec_reaper_pause(state->reaper);
1238         }
1239
1240         /* Detect old blocks that have been covered by the new one */
1241         for (i = 0; i < cstate->nb_targets; i++) {
1242                 target = &cstate->targets[i];
1243
1244                 if (!target->offset)
1245                         continue;
1246
1247                 offset = block->pc + target->offset * sizeof(u32);
1248                 block2 = lightrec_find_block(state->block_cache, offset);
1249                 if (block2) {
1250                         /* No need to check if block2 is compilable - it must
1251                          * be, otherwise block wouldn't be compilable either */
1252
1253                         /* Set the "block dead" flag to prevent the dynarec from
1254                          * recompiling this block */
1255                         block2->flags |= BLOCK_IS_DEAD;
1256
1257                         /* If block2 was pending for compilation, cancel it.
1258                          * If it's being compiled right now, wait until it
1259                          * finishes. */
1260                         if (ENABLE_THREADED_COMPILER)
1261                                 lightrec_recompiler_remove(state->rec, block2);
1262
1263                         /* We know from now on that block2 isn't going to be
1264                          * compiled. We can override the LUT entry with our
1265                          * new block's entry point. */
1266                         offset = lut_offset(block->pc) + target->offset;
1267                         state->code_lut[offset] = jit_address(target->label);
1268
1269                         pr_debug("Reap block 0x%08x as it's covered by block "
1270                                  "0x%08x\n", block2->pc, block->pc);
1271
1272                         /* Finally, reap the block. */
1273                         if (ENABLE_THREADED_COMPILER) {
1274                                 lightrec_reaper_add(state->reaper,
1275                                                     lightrec_reap_block,
1276                                                     block2);
1277                         } else {
1278                                 lightrec_unregister_block(state->block_cache, block2);
1279                                 lightrec_free_block(state, block2);
1280                         }
1281                 }
1282         }
1283
1284         if (ENABLE_DISASSEMBLER)
1285                 lightrec_reaper_continue(state->reaper);
1286
1287         jit_get_code(&code_size);
1288         lightrec_register(MEM_FOR_CODE, code_size);
1289
1290         block->code_size = code_size;
1291
1292         if (ENABLE_DISASSEMBLER) {
1293                 pr_debug("Compiling block at PC: 0x%08x\n", block->pc);
1294                 jit_disassemble();
1295         }
1296
1297         jit_clear_state();
1298
1299 #if ENABLE_THREADED_COMPILER
1300         if (fully_tagged)
1301                 op_list_freed = atomic_flag_test_and_set(&block->op_list_freed);
1302 #endif
1303         if (fully_tagged && !op_list_freed) {
1304                 pr_debug("Block PC 0x%08x is fully tagged"
1305                          " - free opcode list\n", block->pc);
1306                 lightrec_free_opcode_list(state, block);
1307                 block->opcode_list = NULL;
1308         }
1309
1310         if (oldjit) {
1311                 pr_debug("Block 0x%08x recompiled, reaping old jit context.\n",
1312                          block->pc);
1313
1314                 if (ENABLE_THREADED_COMPILER)
1315                         lightrec_reaper_add(state->reaper,
1316                                             lightrec_reap_jit, oldjit);
1317                 else
1318                         _jit_destroy_state(oldjit);
1319         }
1320
1321         return 0;
1322 }
1323
1324 static void lightrec_print_info(struct lightrec_state *state)
1325 {
1326         if ((state->current_cycle & ~0xfffffff) != state->old_cycle_counter) {
1327                 pr_info("Lightrec RAM usage: IR %u KiB, CODE %u KiB, "
1328                         "MIPS %u KiB, TOTAL %u KiB, avg. IPI %f\n",
1329                         lightrec_get_mem_usage(MEM_FOR_IR) / 1024,
1330                         lightrec_get_mem_usage(MEM_FOR_CODE) / 1024,
1331                         lightrec_get_mem_usage(MEM_FOR_MIPS_CODE) / 1024,
1332                         lightrec_get_total_mem_usage() / 1024,
1333                        lightrec_get_average_ipi());
1334                 state->old_cycle_counter = state->current_cycle & ~0xfffffff;
1335         }
1336 }
1337
1338 u32 lightrec_execute(struct lightrec_state *state, u32 pc, u32 target_cycle)
1339 {
1340         s32 (*func)(void *, s32) = (void *)state->dispatcher->function;
1341         void *block_trace;
1342         s32 cycles_delta;
1343
1344         state->exit_flags = LIGHTREC_EXIT_NORMAL;
1345
1346         /* Handle the cycle counter overflowing */
1347         if (unlikely(target_cycle < state->current_cycle))
1348                 target_cycle = UINT_MAX;
1349
1350         state->target_cycle = target_cycle;
1351         state->next_pc = pc;
1352
1353         block_trace = get_next_block_func(state, pc);
1354         if (block_trace) {
1355                 cycles_delta = state->target_cycle - state->current_cycle;
1356
1357                 cycles_delta = (*func)(block_trace, cycles_delta);
1358
1359                 state->current_cycle = state->target_cycle - cycles_delta;
1360         }
1361
1362         if (ENABLE_THREADED_COMPILER)
1363                 lightrec_reaper_reap(state->reaper);
1364
1365         if (LOG_LEVEL >= INFO_L)
1366                 lightrec_print_info(state);
1367
1368         return state->next_pc;
1369 }
1370
1371 u32 lightrec_execute_one(struct lightrec_state *state, u32 pc)
1372 {
1373         return lightrec_execute(state, pc, state->current_cycle);
1374 }
1375
1376 u32 lightrec_run_interpreter(struct lightrec_state *state, u32 pc)
1377 {
1378         struct block *block = lightrec_get_block(state, pc);
1379         if (!block)
1380                 return 0;
1381
1382         state->exit_flags = LIGHTREC_EXIT_NORMAL;
1383
1384         pc = lightrec_emulate_block(state, block, pc);
1385
1386         if (LOG_LEVEL >= INFO_L)
1387                 lightrec_print_info(state);
1388
1389         return pc;
1390 }
1391
1392 void lightrec_free_block(struct lightrec_state *state, struct block *block)
1393 {
1394         lightrec_unregister(MEM_FOR_MIPS_CODE, block->nb_ops * sizeof(u32));
1395         if (block->opcode_list)
1396                 lightrec_free_opcode_list(state, block);
1397         if (block->_jit)
1398                 _jit_destroy_state(block->_jit);
1399         lightrec_unregister(MEM_FOR_CODE, block->code_size);
1400         lightrec_free(state, MEM_FOR_IR, sizeof(*block), block);
1401 }
1402
1403 struct lightrec_cstate * lightrec_create_cstate(struct lightrec_state *state)
1404 {
1405         struct lightrec_cstate *cstate;
1406
1407         cstate = lightrec_malloc(state, MEM_FOR_LIGHTREC, sizeof(*cstate));
1408         if (!cstate)
1409                 return NULL;
1410
1411         cstate->reg_cache = lightrec_regcache_init(state);
1412         if (!cstate->reg_cache) {
1413                 lightrec_free(state, MEM_FOR_LIGHTREC, sizeof(*cstate), cstate);
1414                 return NULL;
1415         }
1416
1417         cstate->state = state;
1418
1419         return cstate;
1420 }
1421
1422 void lightrec_free_cstate(struct lightrec_cstate *cstate)
1423 {
1424         lightrec_free_regcache(cstate->reg_cache);
1425         lightrec_free(cstate->state, MEM_FOR_LIGHTREC, sizeof(*cstate), cstate);
1426 }
1427
1428 struct lightrec_state * lightrec_init(char *argv0,
1429                                       const struct lightrec_mem_map *map,
1430                                       size_t nb,
1431                                       const struct lightrec_ops *ops)
1432 {
1433         struct lightrec_state *state;
1434
1435         /* Sanity-check ops */
1436         if (!ops || !ops->cop2_op || !ops->enable_ram) {
1437                 pr_err("Missing callbacks in lightrec_ops structure\n");
1438                 return NULL;
1439         }
1440
1441         init_jit(argv0);
1442
1443         state = calloc(1, sizeof(*state) +
1444                        sizeof(*state->code_lut) * CODE_LUT_SIZE);
1445         if (!state)
1446                 goto err_finish_jit;
1447
1448         lightrec_register(MEM_FOR_LIGHTREC, sizeof(*state) +
1449                           sizeof(*state->code_lut) * CODE_LUT_SIZE);
1450
1451 #if ENABLE_TINYMM
1452         state->tinymm = tinymm_init(malloc, free, 4096);
1453         if (!state->tinymm)
1454                 goto err_free_state;
1455 #endif
1456
1457         state->block_cache = lightrec_blockcache_init(state);
1458         if (!state->block_cache)
1459                 goto err_free_tinymm;
1460
1461         if (ENABLE_THREADED_COMPILER) {
1462                 state->rec = lightrec_recompiler_init(state);
1463                 if (!state->rec)
1464                         goto err_free_block_cache;
1465
1466                 state->reaper = lightrec_reaper_init(state);
1467                 if (!state->reaper)
1468                         goto err_free_recompiler;
1469         } else {
1470                 state->cstate = lightrec_create_cstate(state);
1471                 if (!state->cstate)
1472                         goto err_free_block_cache;
1473         }
1474
1475         state->nb_maps = nb;
1476         state->maps = map;
1477
1478         memcpy(&state->ops, ops, sizeof(*ops));
1479
1480         state->dispatcher = generate_dispatcher(state);
1481         if (!state->dispatcher)
1482                 goto err_free_reaper;
1483
1484         state->c_wrapper_block = generate_wrapper(state);
1485         if (!state->c_wrapper_block)
1486                 goto err_free_dispatcher;
1487
1488         state->c_wrapper = state->c_wrapper_block->function;
1489
1490         state->c_wrappers[C_WRAPPER_RW] = lightrec_rw_cb;
1491         state->c_wrappers[C_WRAPPER_RW_GENERIC] = lightrec_rw_generic_cb;
1492         state->c_wrappers[C_WRAPPER_MFC] = lightrec_mfc_cb;
1493         state->c_wrappers[C_WRAPPER_MTC] = lightrec_mtc_cb;
1494         state->c_wrappers[C_WRAPPER_CP] = lightrec_cp;
1495         state->c_wrappers[C_WRAPPER_SYSCALL] = lightrec_syscall_cb;
1496         state->c_wrappers[C_WRAPPER_BREAK] = lightrec_break_cb;
1497
1498         map = &state->maps[PSX_MAP_BIOS];
1499         state->offset_bios = (uintptr_t)map->address - map->pc;
1500
1501         map = &state->maps[PSX_MAP_SCRATCH_PAD];
1502         state->offset_scratch = (uintptr_t)map->address - map->pc;
1503
1504         map = &state->maps[PSX_MAP_KERNEL_USER_RAM];
1505         state->offset_ram = (uintptr_t)map->address - map->pc;
1506
1507         if (state->maps[PSX_MAP_MIRROR1].address == map->address + 0x200000 &&
1508             state->maps[PSX_MAP_MIRROR2].address == map->address + 0x400000 &&
1509             state->maps[PSX_MAP_MIRROR3].address == map->address + 0x600000)
1510                 state->mirrors_mapped = true;
1511
1512         if (state->offset_bios == 0 &&
1513             state->offset_scratch == 0 &&
1514             state->offset_ram == 0 &&
1515             state->mirrors_mapped) {
1516                 pr_info("Memory map is perfect. Emitted code will be best.\n");
1517         } else {
1518                 pr_info("Memory map is sub-par. Emitted code will be slow.\n");
1519         }
1520
1521         return state;
1522
1523 err_free_dispatcher:
1524         lightrec_free_block(state, state->dispatcher);
1525 err_free_reaper:
1526         if (ENABLE_THREADED_COMPILER)
1527                 lightrec_reaper_destroy(state->reaper);
1528 err_free_recompiler:
1529         if (ENABLE_THREADED_COMPILER)
1530                 lightrec_free_recompiler(state->rec);
1531         else
1532                 lightrec_free_cstate(state->cstate);
1533 err_free_block_cache:
1534         lightrec_free_block_cache(state->block_cache);
1535 err_free_tinymm:
1536 #if ENABLE_TINYMM
1537         tinymm_shutdown(state->tinymm);
1538 err_free_state:
1539 #endif
1540         lightrec_unregister(MEM_FOR_LIGHTREC, sizeof(*state) +
1541                             sizeof(*state->code_lut) * CODE_LUT_SIZE);
1542         free(state);
1543 err_finish_jit:
1544         finish_jit();
1545         return NULL;
1546 }
1547
1548 void lightrec_destroy(struct lightrec_state *state)
1549 {
1550         /* Force a print info on destroy*/
1551         state->current_cycle = ~state->current_cycle;
1552         lightrec_print_info(state);
1553
1554         if (ENABLE_THREADED_COMPILER) {
1555                 lightrec_free_recompiler(state->rec);
1556                 lightrec_reaper_destroy(state->reaper);
1557         } else {
1558                 lightrec_free_cstate(state->cstate);
1559         }
1560
1561         lightrec_free_block_cache(state->block_cache);
1562         lightrec_free_block(state, state->dispatcher);
1563         lightrec_free_block(state, state->c_wrapper_block);
1564         finish_jit();
1565
1566 #if ENABLE_TINYMM
1567         tinymm_shutdown(state->tinymm);
1568 #endif
1569         lightrec_unregister(MEM_FOR_LIGHTREC, sizeof(*state) +
1570                             sizeof(*state->code_lut) * CODE_LUT_SIZE);
1571         free(state);
1572 }
1573
1574 void lightrec_invalidate(struct lightrec_state *state, u32 addr, u32 len)
1575 {
1576         u32 kaddr = kunseg(addr & ~0x3);
1577         const struct lightrec_mem_map *map = lightrec_get_map(state, NULL, kaddr);
1578
1579         if (map) {
1580                 if (map != &state->maps[PSX_MAP_KERNEL_USER_RAM])
1581                         return;
1582
1583                 /* Handle mirrors */
1584                 kaddr &= (state->maps[PSX_MAP_KERNEL_USER_RAM].length - 1);
1585
1586                 lightrec_invalidate_map(state, map, kaddr, len);
1587         }
1588 }
1589
1590 void lightrec_invalidate_all(struct lightrec_state *state)
1591 {
1592         memset(state->code_lut, 0, sizeof(*state->code_lut) * CODE_LUT_SIZE);
1593 }
1594
1595 void lightrec_set_invalidate_mode(struct lightrec_state *state, bool dma_only)
1596 {
1597         if (state->invalidate_from_dma_only != dma_only)
1598                 lightrec_invalidate_all(state);
1599
1600         state->invalidate_from_dma_only = dma_only;
1601 }
1602
1603 void lightrec_set_exit_flags(struct lightrec_state *state, u32 flags)
1604 {
1605         if (flags != LIGHTREC_EXIT_NORMAL) {
1606                 state->exit_flags |= flags;
1607                 state->target_cycle = state->current_cycle;
1608         }
1609 }
1610
1611 u32 lightrec_exit_flags(struct lightrec_state *state)
1612 {
1613         return state->exit_flags;
1614 }
1615
1616 u32 lightrec_current_cycle_count(const struct lightrec_state *state)
1617 {
1618         return state->current_cycle;
1619 }
1620
1621 void lightrec_reset_cycle_count(struct lightrec_state *state, u32 cycles)
1622 {
1623         state->current_cycle = cycles;
1624
1625         if (state->target_cycle < cycles)
1626                 state->target_cycle = cycles;
1627 }
1628
1629 void lightrec_set_target_cycle_count(struct lightrec_state *state, u32 cycles)
1630 {
1631         if (state->exit_flags == LIGHTREC_EXIT_NORMAL) {
1632                 if (cycles < state->current_cycle)
1633                         cycles = state->current_cycle;
1634
1635                 state->target_cycle = cycles;
1636         }
1637 }
1638
1639 struct lightrec_registers * lightrec_get_registers(struct lightrec_state *state)
1640 {
1641         return &state->regs;
1642 }