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 && !LIGHTREC_FLAGS_GET_IO_MODE(*flags))
 254                         *flags |= LIGHTREC_IO_MODE(LIGHTREC_IO_HW);
 255
 256                 ops = map->ops;
 257         } else {
 258                 if (flags && !LIGHTREC_FLAGS_GET_IO_MODE(*flags))
 259                         *flags |= LIGHTREC_IO_MODE(LIGHTREC_IO_DIRECT);
 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)
 327 {
 328         lightrec_rw_helper(state, (union code)state->c_wrapper_arg, NULL, NULL);
 329 }
 330
 331 static void lightrec_rw_generic_cb(struct lightrec_state *state)
 332 {
 333         struct block *block;
 334         struct opcode *op;
 335         bool was_tagged;
 336         u32 arg = state->c_wrapper_arg;
 337         u16 offset = (u16)arg;
 338
 339         block = lightrec_find_block_from_lut(state->block_cache,
 340                                              arg >> 16, state->next_pc);
 341         if (unlikely(!block)) {
 342                 pr_err("rw_generic: No block found in LUT for PC 0x%x offset 0x%x\n",
 343                          state->next_pc, offset);
 344                 return;
 345         }
 346
 347         op = &block->opcode_list[offset];
 348         was_tagged = LIGHTREC_FLAGS_GET_IO_MODE(op->flags);
 349
 350         lightrec_rw_helper(state, op->c, &op->flags, block);
 351
 352         if (!was_tagged) {
 353                 pr_debug("Opcode of block at PC 0x%08x has been tagged - flag "
 354                          "for recompilation\n", block->pc);
 355
 356                 block->flags |= BLOCK_SHOULD_RECOMPILE;
 357         }
 358 }
 359
 360 static u32 clamp_s32(s32 val, s32 min, s32 max)
 361 {
 362         return val < min ? min : val > max ? max : val;
 363 }
 364
 365 static u32 lightrec_mfc2(struct lightrec_state *state, u8 reg)
 366 {
 367         s16 gteir1, gteir2, gteir3;
 368
 369         switch (reg) {
 370         case 1:
 371         case 3:
 372         case 5:
 373         case 8:
 374         case 9:
 375         case 10:
 376         case 11:
 377                 return (s32)(s16) state->regs.cp2d[reg];
 378         case 7:
 379         case 16:
 380         case 17:
 381         case 18:
 382         case 19:
 383                 return (u16) state->regs.cp2d[reg];
 384         case 28:
 385         case 29:
 386                 gteir1 = (s16) state->regs.cp2d[9];
 387                 gteir2 = (s16) state->regs.cp2d[10];
 388                 gteir3 = (s16) state->regs.cp2d[11];
 389
 390                 return clamp_s32(gteir1 >> 7, 0, 0x1f) << 0 |
 391                         clamp_s32(gteir2 >> 7, 0, 0x1f) << 5 |
 392                         clamp_s32(gteir3 >> 7, 0, 0x1f) << 10;
 393         case 15:
 394                 reg = 14;
 395         default: /* fall-through */
 396                 return state->regs.cp2d[reg];
 397         }
 398 }
 399
 400 u32 lightrec_mfc(struct lightrec_state *state, union code op)
 401 {
 402         if (op.i.op == OP_CP0)
 403                 return state->regs.cp0[op.r.rd];
 404         else if (op.r.rs == OP_CP2_BASIC_MFC2)
 405                 return lightrec_mfc2(state, op.r.rd);
 406         else
 407                 return state->regs.cp2c[op.r.rd];
 408 }
 409
 410 static void lightrec_mtc0(struct lightrec_state *state, u8 reg, u32 data)
 411 {
 412         u32 status, oldstatus, cause;
 413
 414         switch (reg) {
 415         case 1:
 416         case 4:
 417         case 8:
 418         case 14:
 419         case 15:
 420                 /* Those registers are read-only */
 421                 return;
 422         default:
 423                 break;
 424         }
 425
 426         if (reg == 12) {
 427                 status = state->regs.cp0[12];
 428                 oldstatus = status;
 429
 430                 if (status & ~data & BIT(16)) {
 431                         state->ops.enable_ram(state, true);
 432                         lightrec_invalidate_all(state);
 433                 } else if (~status & data & BIT(16)) {
 434                         state->ops.enable_ram(state, false);
 435                 }
 436         }
 437
 438         if (reg == 13) {
 439                 state->regs.cp0[13] &= ~0x300;
 440                 state->regs.cp0[13] |= data & 0x300;
 441         } else {
 442                 state->regs.cp0[reg] = data;
 443         }
 444
 445         if (reg == 12 || reg == 13) {
 446                 cause = state->regs.cp0[13];
 447                 status = state->regs.cp0[12];
 448
 449                 /* Handle software interrupts */
 450                 if (!!(status & cause & 0x300) & status)
 451                         lightrec_set_exit_flags(state, LIGHTREC_EXIT_CHECK_INTERRUPT);
 452
 453                 /* Handle hardware interrupts */
 454                 if (reg == 12 && !(~status & 0x401) && (~oldstatus & 0x401))
 455                         lightrec_set_exit_flags(state, LIGHTREC_EXIT_CHECK_INTERRUPT);
 456         }
 457 }
 458
 459 static u32 count_leading_bits(s32 data)
 460 {
 461         u32 cnt = 33;
 462
 463 #ifdef __has_builtin
 464 #if __has_builtin(__builtin_clrsb)
 465         return 1 + __builtin_clrsb(data);
 466 #endif
 467 #endif
 468
 469         data = (data ^ (data >> 31)) << 1;
 470
 471         do {
 472                 cnt -= 1;
 473                 data >>= 1;
 474         } while (data);
 475
 476         return cnt;
 477 }
 478
 479 static void lightrec_mtc2(struct lightrec_state *state, u8 reg, u32 data)
 480 {
 481         switch (reg) {
 482         case 15:
 483                 state->regs.cp2d[12] = state->regs.cp2d[13];
 484                 state->regs.cp2d[13] = state->regs.cp2d[14];
 485                 state->regs.cp2d[14] = data;
 486                 break;
 487         case 28:
 488                 state->regs.cp2d[9] = (data << 7) & 0xf80;
 489                 state->regs.cp2d[10] = (data << 2) & 0xf80;
 490                 state->regs.cp2d[11] = (data >> 3) & 0xf80;
 491                 break;
 492         case 31:
 493                 return;
 494         case 30:
 495                 state->regs.cp2d[31] = count_leading_bits((s32) data);
 496         default: /* fall-through */
 497                 state->regs.cp2d[reg] = data;
 498                 break;
 499         }
 500 }
 501
 502 static void lightrec_ctc2(struct lightrec_state *state, u8 reg, u32 data)
 503 {
 504         switch (reg) {
 505         case 4:
 506         case 12:
 507         case 20:
 508         case 26:
 509         case 27:
 510         case 29:
 511         case 30:
 512                 data = (s32)(s16) data;
 513                 break;
 514         case 31:
 515                 data = (data & 0x7ffff000) | !!(data & 0x7f87e000) << 31;
 516         default: /* fall-through */
 517                 break;
 518         }
 519
 520         state->regs.cp2c[reg] = data;
 521 }
 522
 523 void lightrec_mtc(struct lightrec_state *state, union code op, u32 data)
 524 {
 525         if (op.i.op == OP_CP0)
 526                 lightrec_mtc0(state, op.r.rd, data);
 527         else if (op.r.rs == OP_CP2_BASIC_CTC2)
 528                 lightrec_ctc2(state, op.r.rd, data);
 529         else
 530                 lightrec_mtc2(state, op.r.rd, data);
 531 }
 532
 533 static void lightrec_mtc_cb(struct lightrec_state *state)
 534 {
 535         union code op = (union code) state->c_wrapper_arg;
 536
 537         lightrec_mtc(state, op, state->regs.gpr[op.r.rt]);
 538 }
 539
 540 void lightrec_rfe(struct lightrec_state *state)
 541 {
 542         u32 status;
 543
 544         /* Read CP0 Status register (r12) */
 545         status = state->regs.cp0[12];
 546
 547         /* Switch the bits */
 548         status = ((status & 0x3c) >> 2) | (status & ~0xf);
 549
 550         /* Write it back */
 551         lightrec_mtc0(state, 12, status);
 552 }
 553
 554 void lightrec_cp(struct lightrec_state *state, union code op)
 555 {
 556         if (op.i.op == OP_CP0) {
 557                 pr_err("Invalid CP opcode to coprocessor #0\n");
 558                 return;
 559         }
 560
 561         (*state->ops.cop2_op)(state, op.opcode);
 562 }
 563
 564 static void lightrec_cp_cb(struct lightrec_state *state)
 565 {
 566         lightrec_cp(state, (union code) state->c_wrapper_arg);
 567 }
 568
 569 static void lightrec_syscall_cb(struct lightrec_state *state)
 570 {
 571         lightrec_set_exit_flags(state, LIGHTREC_EXIT_SYSCALL);
 572 }
 573
 574 static void lightrec_break_cb(struct lightrec_state *state)
 575 {
 576         lightrec_set_exit_flags(state, LIGHTREC_EXIT_BREAK);
 577 }
 578
 579 struct block * lightrec_get_block(struct lightrec_state *state, u32 pc)
 580 {
 581         struct block *block = lightrec_find_block(state->block_cache, pc);
 582
 583         if (block && lightrec_block_is_outdated(state, block)) {
 584                 pr_debug("Block at PC 0x%08x is outdated!\n", block->pc);
 585
 586                 /* Make sure the recompiler isn't processing the block we'll
 587                  * destroy */
 588                 if (ENABLE_THREADED_COMPILER)
 589                         lightrec_recompiler_remove(state->rec, block);
 590
 591                 lightrec_unregister_block(state->block_cache, block);
 592                 remove_from_code_lut(state->block_cache, block);
 593                 lightrec_free_block(state, block);
 594                 block = NULL;
 595         }
 596
 597         if (!block) {
 598                 block = lightrec_precompile_block(state, pc);
 599                 if (!block) {
 600                         pr_err("Unable to recompile block at PC 0x%x\n", pc);
 601                         lightrec_set_exit_flags(state, LIGHTREC_EXIT_SEGFAULT);
 602                         return NULL;
 603                 }
 604
 605                 lightrec_register_block(state->block_cache, block);
 606         }
 607
 608         return block;
 609 }
 610
 611 static void * get_next_block_func(struct lightrec_state *state, u32 pc)
 612 {
 613         struct block *block;
 614         bool should_recompile;
 615         void *func;
 616
 617         for (;;) {
 618                 func = state->code_lut[lut_offset(pc)];
 619                 if (func && func != state->get_next_block)
 620                         break;
 621
 622                 block = lightrec_get_block(state, pc);
 623
 624                 if (unlikely(!block))
 625                         break;
 626
 627                 if (OPT_REPLACE_MEMSET && (block->flags & BLOCK_IS_MEMSET)) {
 628                         func = state->memset_func;
 629                         break;
 630                 }
 631
 632                 should_recompile = block->flags & BLOCK_SHOULD_RECOMPILE &&
 633                         !(block->flags & BLOCK_IS_DEAD);
 634
 635                 if (unlikely(should_recompile)) {
 636                         pr_debug("Block at PC 0x%08x should recompile\n", pc);
 637
 638                         lightrec_unregister(MEM_FOR_CODE, block->code_size);
 639
 640                         if (ENABLE_THREADED_COMPILER)
 641                                 lightrec_recompiler_add(state->rec, block);
 642                         else
 643                                 lightrec_compile_block(state->cstate, block);
 644                 }
 645
 646                 if (ENABLE_THREADED_COMPILER && likely(!should_recompile))
 647                         func = lightrec_recompiler_run_first_pass(state, block, &pc);
 648                 else
 649                         func = block->function;
 650
 651                 if (likely(func))
 652                         break;
 653
 654                 if (unlikely(block->flags & BLOCK_NEVER_COMPILE)) {
 655                         pc = lightrec_emulate_block(state, block, pc);
 656
 657                 } else if (!ENABLE_THREADED_COMPILER) {
 658                         /* Block wasn't compiled yet - run the interpreter */
 659                         if (block->flags & BLOCK_FULLY_TAGGED)
 660                                 pr_debug("Block fully tagged, skipping first pass\n");
 661                         else if (ENABLE_FIRST_PASS && likely(!should_recompile))
 662                                 pc = lightrec_emulate_block(state, block, pc);
 663
 664                         /* Then compile it using the profiled data */
 665                         lightrec_compile_block(state->cstate, block);
 666                 } else {
 667                         lightrec_recompiler_add(state->rec, block);
 668                 }
 669
 670                 if (state->exit_flags != LIGHTREC_EXIT_NORMAL ||
 671                     state->current_cycle >= state->target_cycle)
 672                         break;
 673         }
 674
 675         state->next_pc = pc;
 676         return func;
 677 }
 678
 679 static s32 c_function_wrapper(struct lightrec_state *state, s32 cycles_delta,
 680                               void (*f)(struct lightrec_state *))
 681 {
 682         state->current_cycle = state->target_cycle - cycles_delta;
 683
 684         (*f)(state);
 685
 686         return state->target_cycle - state->current_cycle;
 687 }
 688
 689 static struct block * generate_wrapper(struct lightrec_state *state)
 690 {
 691         struct block *block;
 692         jit_state_t *_jit;
 693         unsigned int i;
 694         int stack_ptr;
 695         jit_word_t code_size;
 696         jit_node_t *to_tramp, *to_fn_epilog;
 697         jit_node_t *addr[C_WRAPPERS_COUNT - 1];
 698
 699         block = lightrec_malloc(state, MEM_FOR_IR, sizeof(*block));
 700         if (!block)
 701                 goto err_no_mem;
 702
 703         _jit = jit_new_state();
 704         if (!_jit)
 705                 goto err_free_block;
 706
 707         jit_name("RW wrapper");
 708         jit_note(__FILE__, __LINE__);
 709
 710         /* Wrapper entry point */
 711         jit_prolog();
 712         jit_tramp(256);
 713
 714         /* Add entry points; separate them by opcodes that increment
 715          * LIGHTREC_REG_STATE (since we cannot touch other registers).
 716          * The difference will then tell us which C function to call. */
 717         for (i = C_WRAPPERS_COUNT - 1; i > 0; i--) {
 718                 jit_addi(LIGHTREC_REG_STATE, LIGHTREC_REG_STATE, __WORDSIZE / 8);
 719                 addr[i - 1] = jit_indirect();
 720         }
 721
 722         jit_epilog();
 723         jit_prolog();
 724
 725         stack_ptr = jit_allocai(sizeof(uintptr_t) * NUM_TEMPS);
 726
 727         /* Save all temporaries on stack */
 728         for (i = 0; i < NUM_TEMPS; i++)
 729                 jit_stxi(stack_ptr + i * sizeof(uintptr_t), JIT_FP, JIT_R(i));
 730
 731         /* Jump to the trampoline */
 732         to_tramp = jit_jmpi();
 733
 734         /* The trampoline will jump back here */
 735         to_fn_epilog = jit_label();
 736
 737         /* Restore temporaries from stack */
 738         for (i = 0; i < NUM_TEMPS; i++)
 739                 jit_ldxi(JIT_R(i), JIT_FP, stack_ptr + i * sizeof(uintptr_t));
 740
 741         jit_ret();
 742         jit_epilog();
 743
 744         /* Trampoline entry point.
 745          * The sole purpose of the trampoline is to cheese Lightning not to
 746          * save/restore the callee-saved register LIGHTREC_REG_CYCLE, since we
 747          * do want to return to the caller with this register modified. */
 748         jit_prolog();
 749         jit_tramp(256);
 750         jit_patch(to_tramp);
 751
 752         /* Retrieve the wrapper function */
 753         jit_ldxi(JIT_R0, LIGHTREC_REG_STATE,
 754                  offsetof(struct lightrec_state, c_wrappers));
 755
 756         /* Restore LIGHTREC_REG_STATE to its correct value */
 757         jit_movi(LIGHTREC_REG_STATE, (uintptr_t) state);
 758
 759         jit_prepare();
 760         jit_pushargr(LIGHTREC_REG_STATE);
 761         jit_pushargr(LIGHTREC_REG_CYCLE);
 762         jit_pushargr(JIT_R0);
 763         jit_finishi(c_function_wrapper);
 764         jit_retval_i(LIGHTREC_REG_CYCLE);
 765
 766         jit_patch_at(jit_jmpi(), to_fn_epilog);
 767         jit_epilog();
 768
 769         block->_jit = _jit;
 770         block->function = jit_emit();
 771         block->opcode_list = NULL;
 772         block->flags = 0;
 773         block->nb_ops = 0;
 774
 775         state->wrappers_eps[C_WRAPPERS_COUNT - 1] = block->function;
 776
 777         for (i = 0; i < C_WRAPPERS_COUNT - 1; i++)
 778                 state->wrappers_eps[i] = jit_address(addr[i]);
 779
 780         jit_get_code(&code_size);
 781         lightrec_register(MEM_FOR_CODE, code_size);
 782
 783         block->code_size = code_size;
 784
 785         if (ENABLE_DISASSEMBLER) {
 786                 pr_debug("Wrapper block:\n");
 787                 jit_disassemble();
 788         }
 789
 790         jit_clear_state();
 791         return block;
 792
 793 err_free_block:
 794         lightrec_free(state, MEM_FOR_IR, sizeof(*block), block);
 795 err_no_mem:
 796         pr_err("Unable to compile wrapper: Out of memory\n");
 797         return NULL;
 798 }
 799
 800 static u32 lightrec_memset(struct lightrec_state *state)
 801 {
 802         u32 kunseg_pc = kunseg(state->regs.gpr[4]);
 803         void *host;
 804         const struct lightrec_mem_map *map = lightrec_get_map(state, &host, kunseg_pc);
 805         u32 length = state->regs.gpr[5] * 4;
 806
 807         if (!map) {
 808                 pr_err("Unable to find memory map for memset target address "
 809                        "0x%x\n", kunseg_pc);
 810                 return 0;
 811         }
 812
 813         pr_debug("Calling host memset, PC 0x%x (host address 0x%" PRIxPTR ") for %u bytes\n",
 814                  kunseg_pc, (uintptr_t)host, length);
 815         memset(host, 0, length);
 816
 817         if (!state->invalidate_from_dma_only)
 818                 lightrec_invalidate_map(state, map, kunseg_pc, length);
 819
 820         /* Rough estimation of the number of cycles consumed */
 821         return 8 + 5 * (length  + 3 / 4);
 822 }
 823
 824 static struct block * generate_dispatcher(struct lightrec_state *state)
 825 {
 826         struct block *block;
 827         jit_state_t *_jit;
 828         jit_node_t *to_end, *to_c, *loop, *addr, *addr2, *addr3;
 829         unsigned int i;
 830         u32 offset, ram_len;
 831         jit_word_t code_size;
 832
 833         block = lightrec_malloc(state, MEM_FOR_IR, sizeof(*block));
 834         if (!block)
 835                 goto err_no_mem;
 836
 837         _jit = jit_new_state();
 838         if (!_jit)
 839                 goto err_free_block;
 840
 841         jit_name("dispatcher");
 842         jit_note(__FILE__, __LINE__);
 843
 844         jit_prolog();
 845         jit_frame(256);
 846
 847         jit_getarg(JIT_R0, jit_arg());
 848         jit_getarg_i(LIGHTREC_REG_CYCLE, jit_arg());
 849
 850         /* Force all callee-saved registers to be pushed on the stack */
 851         for (i = 0; i < NUM_REGS; i++)
 852                 jit_movr(JIT_V(i), JIT_V(i));
 853
 854         /* Pass lightrec_state structure to blocks, using the last callee-saved
 855          * register that Lightning provides */
 856         jit_movi(LIGHTREC_REG_STATE, (intptr_t) state);
 857
 858         loop = jit_label();
 859
 860         /* Call the block's code */
 861         jit_jmpr(JIT_R0);
 862
 863         if (OPT_REPLACE_MEMSET) {
 864                 /* Blocks will jump here when they need to call
 865                  * lightrec_memset() */
 866                 addr3 = jit_indirect();
 867
 868                 jit_prepare();
 869                 jit_pushargr(LIGHTREC_REG_STATE);
 870                 jit_finishi(lightrec_memset);
 871
 872                 jit_ldxi_ui(JIT_V0, LIGHTREC_REG_STATE,
 873                             offsetof(struct lightrec_state, regs.gpr[31]));
 874
 875                 jit_retval(JIT_R0);
 876                 jit_subr(LIGHTREC_REG_CYCLE, LIGHTREC_REG_CYCLE, JIT_R0);
 877         }
 878
 879         /* The block will jump here, with the number of cycles remaining in
 880          * LIGHTREC_REG_CYCLE */
 881         addr2 = jit_indirect();
 882
 883         /* Store back the next_pc to the lightrec_state structure */
 884         offset = offsetof(struct lightrec_state, next_pc);
 885         jit_stxi_i(offset, LIGHTREC_REG_STATE, JIT_V0);
 886
 887         /* Jump to end if state->target_cycle < state->current_cycle */
 888         to_end = jit_blei(LIGHTREC_REG_CYCLE, 0);
 889
 890         /* Convert next PC to KUNSEG and avoid mirrors */
 891         ram_len = state->maps[PSX_MAP_KERNEL_USER_RAM].length;
 892         jit_andi(JIT_R0, JIT_V0, 0x10000000 | (ram_len - 1));
 893         to_c = jit_bgei(JIT_R0, ram_len);
 894
 895         /* Fast path: code is running from RAM, use the code LUT */
 896         if (__WORDSIZE == 64)
 897                 jit_lshi(JIT_R0, JIT_R0, 1);
 898         jit_addr(JIT_R0, JIT_R0, LIGHTREC_REG_STATE);
 899         jit_ldxi(JIT_R0, JIT_R0, offsetof(struct lightrec_state, code_lut));
 900
 901         /* If we get non-NULL, loop */
 902         jit_patch_at(jit_bnei(JIT_R0, 0), loop);
 903
 904         /* Slow path: call C function get_next_block_func() */
 905         jit_patch(to_c);
 906
 907         if (ENABLE_FIRST_PASS || OPT_DETECT_IMPOSSIBLE_BRANCHES) {
 908                 /* We may call the interpreter - update state->current_cycle */
 909                 jit_ldxi_i(JIT_R2, LIGHTREC_REG_STATE,
 910                            offsetof(struct lightrec_state, target_cycle));
 911                 jit_subr(JIT_R1, JIT_R2, LIGHTREC_REG_CYCLE);
 912                 jit_stxi_i(offsetof(struct lightrec_state, current_cycle),
 913                            LIGHTREC_REG_STATE, JIT_R1);
 914         }
 915
 916         /* The code LUT will be set to this address when the block at the target
 917          * PC has been preprocessed but not yet compiled by the threaded
 918          * recompiler */
 919         addr = jit_indirect();
 920
 921         /* Get the next block */
 922         jit_prepare();
 923         jit_pushargr(LIGHTREC_REG_STATE);
 924         jit_pushargr(JIT_V0);
 925         jit_finishi(&get_next_block_func);
 926         jit_retval(JIT_R0);
 927
 928         if (ENABLE_FIRST_PASS || OPT_DETECT_IMPOSSIBLE_BRANCHES) {
 929                 /* The interpreter may have updated state->current_cycle and
 930                  * state->target_cycle - recalc the delta */
 931                 jit_ldxi_i(JIT_R1, LIGHTREC_REG_STATE,
 932                            offsetof(struct lightrec_state, current_cycle));
 933                 jit_ldxi_i(JIT_R2, LIGHTREC_REG_STATE,
 934                            offsetof(struct lightrec_state, target_cycle));
 935                 jit_subr(LIGHTREC_REG_CYCLE, JIT_R2, JIT_R1);
 936         }
 937
 938         /* If we get non-NULL, loop */
 939         jit_patch_at(jit_bnei(JIT_R0, 0), loop);
 940
 941         /* When exiting, the recompiled code will jump to that address */
 942         jit_note(__FILE__, __LINE__);
 943         jit_patch(to_end);
 944
 945         jit_retr(LIGHTREC_REG_CYCLE);
 946         jit_epilog();
 947
 948         block->_jit = _jit;
 949         block->function = jit_emit();
 950         block->opcode_list = NULL;
 951         block->flags = 0;
 952         block->nb_ops = 0;
 953
 954         jit_get_code(&code_size);
 955         lightrec_register(MEM_FOR_CODE, code_size);
 956
 957         block->code_size = code_size;
 958
 959         state->eob_wrapper_func = jit_address(addr2);
 960         if (OPT_REPLACE_MEMSET)
 961                 state->memset_func = jit_address(addr3);
 962         state->get_next_block = jit_address(addr);
 963
 964         if (ENABLE_DISASSEMBLER) {
 965                 pr_debug("Dispatcher block:\n");
 966                 jit_disassemble();
 967         }
 968
 969         /* We're done! */
 970         jit_clear_state();
 971         return block;
 972
 973 err_free_block:
 974         lightrec_free(state, MEM_FOR_IR, sizeof(*block), block);
 975 err_no_mem:
 976         pr_err("Unable to compile dispatcher: Out of memory\n");
 977         return NULL;
 978 }
 979
 980 union code lightrec_read_opcode(struct lightrec_state *state, u32 pc)
 981 {
 982         void *host = NULL;
 983
 984         lightrec_get_map(state, &host, kunseg(pc));
 985
 986         const u32 *code = (u32 *)host;
 987         return (union code) *code;
 988 }
 989
 990 unsigned int lightrec_cycles_of_opcode(union code code)
 991 {
 992         return 2;
 993 }
 994
 995 void lightrec_free_opcode_list(struct lightrec_state *state, struct block *block)
 996 {
 997         lightrec_free(state, MEM_FOR_IR,
 998                       sizeof(*block->opcode_list) * block->nb_ops,
 999                       block->opcode_list);
1000 }
1001
1002 static unsigned int lightrec_get_mips_block_len(const u32 *src)
1003 {
1004         unsigned int i;
1005         union code c;
1006
1007         for (i = 1; ; i++) {
1008                 c.opcode = LE32TOH(*src++);
1009
1010                 if (is_syscall(c))
1011                         return i;
1012
1013                 if (is_unconditional_jump(c))
1014                         return i + 1;
1015         }
1016 }
1017
1018 static struct opcode * lightrec_disassemble(struct lightrec_state *state,
1019                                             const u32 *src, unsigned int *len)
1020 {
1021         struct opcode *list;
1022         unsigned int i, length;
1023
1024         length = lightrec_get_mips_block_len(src);
1025
1026         list = lightrec_malloc(state, MEM_FOR_IR, sizeof(*list) * length);
1027         if (!list) {
1028                 pr_err("Unable to allocate memory\n");
1029                 return NULL;
1030         }
1031
1032         for (i = 0; i < length; i++) {
1033                 list[i].opcode = LE32TOH(src[i]);
1034                 list[i].flags = 0;
1035         }
1036
1037         *len = length * sizeof(u32);
1038
1039         return list;
1040 }
1041
1042 static struct block * lightrec_precompile_block(struct lightrec_state *state,
1043                                                 u32 pc)
1044 {
1045         struct opcode *list;
1046         struct block *block;
1047         void *host;
1048         const struct lightrec_mem_map *map = lightrec_get_map(state, &host, kunseg(pc));
1049         const u32 *code = (u32 *) host;
1050         unsigned int length;
1051         bool fully_tagged;
1052
1053         if (!map)
1054                 return NULL;
1055
1056         block = lightrec_malloc(state, MEM_FOR_IR, sizeof(*block));
1057         if (!block) {
1058                 pr_err("Unable to recompile block: Out of memory\n");
1059                 return NULL;
1060         }
1061
1062         list = lightrec_disassemble(state, code, &length);
1063         if (!list) {
1064                 lightrec_free(state, MEM_FOR_IR, sizeof(*block), block);
1065                 return NULL;
1066         }
1067
1068         block->pc = pc;
1069         block->_jit = NULL;
1070         block->function = NULL;
1071         block->opcode_list = list;
1072         block->code = code;
1073         block->next = NULL;
1074         block->flags = 0;
1075         block->code_size = 0;
1076 #if ENABLE_THREADED_COMPILER
1077         block->op_list_freed = (atomic_flag)ATOMIC_FLAG_INIT;
1078 #endif
1079         block->nb_ops = length / sizeof(u32);
1080
1081         lightrec_optimize(state, block);
1082
1083         length = block->nb_ops * sizeof(u32);
1084
1085         lightrec_register(MEM_FOR_MIPS_CODE, length);
1086
1087         if (ENABLE_DISASSEMBLER) {
1088                 pr_debug("Disassembled block at PC: 0x%08x\n", block->pc);
1089                 lightrec_print_disassembly(block, code);
1090         }
1091
1092         pr_debug("Block size: %hu opcodes\n", block->nb_ops);
1093
1094         /* If the first opcode is an 'impossible' branch, never compile the
1095          * block */
1096         if (should_emulate(block->opcode_list))
1097                 block->flags |= BLOCK_NEVER_COMPILE;
1098
1099         fully_tagged = lightrec_block_is_fully_tagged(block);
1100         if (fully_tagged)
1101                 block->flags |= BLOCK_FULLY_TAGGED;
1102
1103         if (OPT_REPLACE_MEMSET && (block->flags & BLOCK_IS_MEMSET))
1104                 state->code_lut[lut_offset(pc)] = state->memset_func;
1105
1106         block->hash = lightrec_calculate_block_hash(block);
1107
1108         pr_debug("Recompile count: %u\n", state->nb_precompile++);
1109
1110         return block;
1111 }
1112
1113 static bool lightrec_block_is_fully_tagged(const struct block *block)
1114 {
1115         const struct opcode *op;
1116         unsigned int i;
1117
1118         for (i = 0; i < block->nb_ops; i++) {
1119                 op = &block->opcode_list[i];
1120
1121                 /* Verify that all load/stores of the opcode list
1122                  * Check all loads/stores of the opcode list and mark the
1123                  * block as fully compiled if they all have been tagged. */
1124                 switch (op->c.i.op) {
1125                 case OP_LB:
1126                 case OP_LH:
1127                 case OP_LWL:
1128                 case OP_LW:
1129                 case OP_LBU:
1130                 case OP_LHU:
1131                 case OP_LWR:
1132                 case OP_SB:
1133                 case OP_SH:
1134                 case OP_SWL:
1135                 case OP_SW:
1136                 case OP_SWR:
1137                 case OP_LWC2:
1138                 case OP_SWC2:
1139                         if (!LIGHTREC_FLAGS_GET_IO_MODE(op->flags))
1140                                 return false;
1141                 default: /* fall-through */
1142                         continue;
1143                 }
1144         }
1145
1146         return true;
1147 }
1148
1149 static void lightrec_reap_block(struct lightrec_state *state, void *data)
1150 {
1151         struct block *block = data;
1152
1153         pr_debug("Reap dead block at PC 0x%08x\n", block->pc);
1154         lightrec_unregister_block(state->block_cache, block);
1155         lightrec_free_block(state, block);
1156 }
1157
1158 static void lightrec_reap_jit(struct lightrec_state *state, void *data)
1159 {
1160         _jit_destroy_state(data);
1161 }
1162
1163 int lightrec_compile_block(struct lightrec_cstate *cstate,
1164                            struct block *block)
1165 {
1166         struct lightrec_state *state = cstate->state;
1167         struct lightrec_branch_target *target;
1168         bool op_list_freed = false, fully_tagged = false;
1169         struct block *block2;
1170         struct opcode *elm;
1171         jit_state_t *_jit, *oldjit;
1172         jit_node_t *start_of_block;
1173         bool skip_next = false;
1174         jit_word_t code_size;
1175         unsigned int i, j;
1176         u32 offset;
1177
1178         fully_tagged = lightrec_block_is_fully_tagged(block);
1179         if (fully_tagged)
1180                 block->flags |= BLOCK_FULLY_TAGGED;
1181
1182         _jit = jit_new_state();
1183         if (!_jit)
1184                 return -ENOMEM;
1185
1186         oldjit = block->_jit;
1187         block->_jit = _jit;
1188
1189         lightrec_regcache_reset(cstate->reg_cache);
1190         cstate->cycles = 0;
1191         cstate->nb_branches = 0;
1192         cstate->nb_local_branches = 0;
1193         cstate->nb_targets = 0;
1194
1195         jit_prolog();
1196         jit_tramp(256);
1197
1198         start_of_block = jit_label();
1199
1200         for (i = 0; i < block->nb_ops; i++) {
1201                 elm = &block->opcode_list[i];
1202
1203                 if (skip_next) {
1204                         skip_next = false;
1205                         continue;
1206                 }
1207
1208                 cstate->cycles += lightrec_cycles_of_opcode(elm->c);
1209
1210                 if (should_emulate(elm)) {
1211                         pr_debug("Branch at offset 0x%x will be emulated\n",
1212                                  i << 2);
1213
1214                         lightrec_emit_eob(cstate, block, i, false);
1215                         skip_next = !(elm->flags & LIGHTREC_NO_DS);
1216                 } else {
1217                         lightrec_rec_opcode(cstate, block, i);
1218                         skip_next = has_delay_slot(elm->c) &&
1219                                 !(elm->flags & LIGHTREC_NO_DS);
1220 #if _WIN32
1221                         /* FIXME: GNU Lightning on Windows seems to use our
1222                          * mapped registers as temporaries. Until the actual bug
1223                          * is found and fixed, unconditionally mark our
1224                          * registers as live here. */
1225                         lightrec_regcache_mark_live(cstate->reg_cache, _jit);
1226 #endif
1227                 }
1228         }
1229
1230         for (i = 0; i < cstate->nb_branches; i++)
1231                 jit_patch(cstate->branches[i]);
1232
1233         for (i = 0; i < cstate->nb_local_branches; i++) {
1234                 struct lightrec_branch *branch = &cstate->local_branches[i];
1235
1236                 pr_debug("Patch local branch to offset 0x%x\n",
1237                          branch->target << 2);
1238
1239                 if (branch->target == 0) {
1240                         jit_patch_at(branch->branch, start_of_block);
1241                         continue;
1242                 }
1243
1244                 for (j = 0; j < cstate->nb_targets; j++) {
1245                         if (cstate->targets[j].offset == branch->target) {
1246                                 jit_patch_at(branch->branch,
1247                                              cstate->targets[j].label);
1248                                 break;
1249                         }
1250                 }
1251
1252                 if (j == cstate->nb_targets)
1253                         pr_err("Unable to find branch target\n");
1254         }
1255
1256         jit_ldxi(JIT_R0, LIGHTREC_REG_STATE,
1257                  offsetof(struct lightrec_state, eob_wrapper_func));
1258
1259         jit_jmpr(JIT_R0);
1260
1261         jit_ret();
1262         jit_epilog();
1263
1264         block->function = jit_emit();
1265         block->flags &= ~BLOCK_SHOULD_RECOMPILE;
1266
1267         /* Add compiled function to the LUT */
1268         state->code_lut[lut_offset(block->pc)] = block->function;
1269
1270         if (ENABLE_THREADED_COMPILER) {
1271                 /* Since we might try to reap the same block multiple times,
1272                  * we need the reaper to wait until everything has been
1273                  * submitted, so that the duplicate entries can be dropped. */
1274                 lightrec_reaper_pause(state->reaper);
1275         }
1276
1277         /* Detect old blocks that have been covered by the new one */
1278         for (i = 0; i < cstate->nb_targets; i++) {
1279                 target = &cstate->targets[i];
1280
1281                 if (!target->offset)
1282                         continue;
1283
1284                 offset = block->pc + target->offset * sizeof(u32);
1285                 block2 = lightrec_find_block(state->block_cache, offset);
1286                 if (block2) {
1287                         /* No need to check if block2 is compilable - it must
1288                          * be, otherwise block wouldn't be compilable either */
1289
1290                         /* Set the "block dead" flag to prevent the dynarec from
1291                          * recompiling this block */
1292                         block2->flags |= BLOCK_IS_DEAD;
1293
1294                         /* If block2 was pending for compilation, cancel it.
1295                          * If it's being compiled right now, wait until it
1296                          * finishes. */
1297                         if (ENABLE_THREADED_COMPILER)
1298                                 lightrec_recompiler_remove(state->rec, block2);
1299                 }
1300
1301                 /* We know from now on that block2 (if present) isn't going to
1302                  * be compiled. We can override the LUT entry with our new
1303                  * block's entry point. */
1304                 offset = lut_offset(block->pc) + target->offset;
1305                 state->code_lut[offset] = jit_address(target->label);
1306
1307                 if (block2) {
1308                         pr_debug("Reap block 0x%08x as it's covered by block "
1309                                  "0x%08x\n", block2->pc, block->pc);
1310
1311                         /* Finally, reap the block. */
1312                         if (ENABLE_THREADED_COMPILER) {
1313                                 lightrec_reaper_add(state->reaper,
1314                                                     lightrec_reap_block,
1315                                                     block2);
1316                         } else {
1317                                 lightrec_unregister_block(state->block_cache, block2);
1318                                 lightrec_free_block(state, block2);
1319                         }
1320                 }
1321         }
1322
1323         if (ENABLE_THREADED_COMPILER)
1324                 lightrec_reaper_continue(state->reaper);
1325
1326         jit_get_code(&code_size);
1327         lightrec_register(MEM_FOR_CODE, code_size);
1328
1329         block->code_size = code_size;
1330
1331         if (ENABLE_DISASSEMBLER) {
1332                 pr_debug("Compiling block at PC: 0x%08x\n", block->pc);
1333                 jit_disassemble();
1334         }
1335
1336         jit_clear_state();
1337
1338 #if ENABLE_THREADED_COMPILER
1339         if (fully_tagged)
1340                 op_list_freed = atomic_flag_test_and_set(&block->op_list_freed);
1341 #endif
1342         if (fully_tagged && !op_list_freed) {
1343                 pr_debug("Block PC 0x%08x is fully tagged"
1344                          " - free opcode list\n", block->pc);
1345                 lightrec_free_opcode_list(state, block);
1346                 block->opcode_list = NULL;
1347         }
1348
1349         if (oldjit) {
1350                 pr_debug("Block 0x%08x recompiled, reaping old jit context.\n",
1351                          block->pc);
1352
1353                 if (ENABLE_THREADED_COMPILER)
1354                         lightrec_reaper_add(state->reaper,
1355                                             lightrec_reap_jit, oldjit);
1356                 else
1357                         _jit_destroy_state(oldjit);
1358         }
1359
1360         return 0;
1361 }
1362
1363 static void lightrec_print_info(struct lightrec_state *state)
1364 {
1365         if ((state->current_cycle & ~0xfffffff) != state->old_cycle_counter) {
1366                 pr_info("Lightrec RAM usage: IR %u KiB, CODE %u KiB, "
1367                         "MIPS %u KiB, TOTAL %u KiB, avg. IPI %f\n",
1368                         lightrec_get_mem_usage(MEM_FOR_IR) / 1024,
1369                         lightrec_get_mem_usage(MEM_FOR_CODE) / 1024,
1370                         lightrec_get_mem_usage(MEM_FOR_MIPS_CODE) / 1024,
1371                         lightrec_get_total_mem_usage() / 1024,
1372                        lightrec_get_average_ipi());
1373                 state->old_cycle_counter = state->current_cycle & ~0xfffffff;
1374         }
1375 }
1376
1377 u32 lightrec_execute(struct lightrec_state *state, u32 pc, u32 target_cycle)
1378 {
1379         s32 (*func)(void *, s32) = (void *)state->dispatcher->function;
1380         void *block_trace;
1381         s32 cycles_delta;
1382
1383         state->exit_flags = LIGHTREC_EXIT_NORMAL;
1384
1385         /* Handle the cycle counter overflowing */
1386         if (unlikely(target_cycle < state->current_cycle))
1387                 target_cycle = UINT_MAX;
1388
1389         state->target_cycle = target_cycle;
1390         state->next_pc = pc;
1391
1392         block_trace = get_next_block_func(state, pc);
1393         if (block_trace) {
1394                 cycles_delta = state->target_cycle - state->current_cycle;
1395
1396                 cycles_delta = (*func)(block_trace, cycles_delta);
1397
1398                 state->current_cycle = state->target_cycle - cycles_delta;
1399         }
1400
1401         if (ENABLE_THREADED_COMPILER)
1402                 lightrec_reaper_reap(state->reaper);
1403
1404         if (LOG_LEVEL >= INFO_L)
1405                 lightrec_print_info(state);
1406
1407         return state->next_pc;
1408 }
1409
1410 u32 lightrec_execute_one(struct lightrec_state *state, u32 pc)
1411 {
1412         return lightrec_execute(state, pc, state->current_cycle);
1413 }
1414
1415 u32 lightrec_run_interpreter(struct lightrec_state *state, u32 pc)
1416 {
1417         struct block *block = lightrec_get_block(state, pc);
1418         if (!block)
1419                 return 0;
1420
1421         state->exit_flags = LIGHTREC_EXIT_NORMAL;
1422
1423         pc = lightrec_emulate_block(state, block, pc);
1424
1425         if (LOG_LEVEL >= INFO_L)
1426                 lightrec_print_info(state);
1427
1428         return pc;
1429 }
1430
1431 void lightrec_free_block(struct lightrec_state *state, struct block *block)
1432 {
1433         lightrec_unregister(MEM_FOR_MIPS_CODE, block->nb_ops * sizeof(u32));
1434         if (block->opcode_list)
1435                 lightrec_free_opcode_list(state, block);
1436         if (block->_jit)
1437                 _jit_destroy_state(block->_jit);
1438         lightrec_unregister(MEM_FOR_CODE, block->code_size);
1439         lightrec_free(state, MEM_FOR_IR, sizeof(*block), block);
1440 }
1441
1442 struct lightrec_cstate * lightrec_create_cstate(struct lightrec_state *state)
1443 {
1444         struct lightrec_cstate *cstate;
1445
1446         cstate = lightrec_malloc(state, MEM_FOR_LIGHTREC, sizeof(*cstate));
1447         if (!cstate)
1448                 return NULL;
1449
1450         cstate->reg_cache = lightrec_regcache_init(state);
1451         if (!cstate->reg_cache) {
1452                 lightrec_free(state, MEM_FOR_LIGHTREC, sizeof(*cstate), cstate);
1453                 return NULL;
1454         }
1455
1456         cstate->state = state;
1457
1458         return cstate;
1459 }
1460
1461 void lightrec_free_cstate(struct lightrec_cstate *cstate)
1462 {
1463         lightrec_free_regcache(cstate->reg_cache);
1464         lightrec_free(cstate->state, MEM_FOR_LIGHTREC, sizeof(*cstate), cstate);
1465 }
1466
1467 struct lightrec_state * lightrec_init(char *argv0,
1468                                       const struct lightrec_mem_map *map,
1469                                       size_t nb,
1470                                       const struct lightrec_ops *ops)
1471 {
1472         struct lightrec_state *state;
1473
1474         /* Sanity-check ops */
1475         if (!ops || !ops->cop2_op || !ops->enable_ram) {
1476                 pr_err("Missing callbacks in lightrec_ops structure\n");
1477                 return NULL;
1478         }
1479
1480         init_jit(argv0);
1481
1482         state = calloc(1, sizeof(*state) +
1483                        sizeof(*state->code_lut) * CODE_LUT_SIZE);
1484         if (!state)
1485                 goto err_finish_jit;
1486
1487         lightrec_register(MEM_FOR_LIGHTREC, sizeof(*state) +
1488                           sizeof(*state->code_lut) * CODE_LUT_SIZE);
1489
1490 #if ENABLE_TINYMM
1491         state->tinymm = tinymm_init(malloc, free, 4096);
1492         if (!state->tinymm)
1493                 goto err_free_state;
1494 #endif
1495
1496         state->block_cache = lightrec_blockcache_init(state);
1497         if (!state->block_cache)
1498                 goto err_free_tinymm;
1499
1500         if (ENABLE_THREADED_COMPILER) {
1501                 state->rec = lightrec_recompiler_init(state);
1502                 if (!state->rec)
1503                         goto err_free_block_cache;
1504
1505                 state->reaper = lightrec_reaper_init(state);
1506                 if (!state->reaper)
1507                         goto err_free_recompiler;
1508         } else {
1509                 state->cstate = lightrec_create_cstate(state);
1510                 if (!state->cstate)
1511                         goto err_free_block_cache;
1512         }
1513
1514         state->nb_maps = nb;
1515         state->maps = map;
1516
1517         memcpy(&state->ops, ops, sizeof(*ops));
1518
1519         state->dispatcher = generate_dispatcher(state);
1520         if (!state->dispatcher)
1521                 goto err_free_reaper;
1522
1523         state->c_wrapper_block = generate_wrapper(state);
1524         if (!state->c_wrapper_block)
1525                 goto err_free_dispatcher;
1526
1527         state->c_wrappers[C_WRAPPER_RW] = lightrec_rw_cb;
1528         state->c_wrappers[C_WRAPPER_RW_GENERIC] = lightrec_rw_generic_cb;
1529         state->c_wrappers[C_WRAPPER_MTC] = lightrec_mtc_cb;
1530         state->c_wrappers[C_WRAPPER_CP] = lightrec_cp_cb;
1531         state->c_wrappers[C_WRAPPER_SYSCALL] = lightrec_syscall_cb;
1532         state->c_wrappers[C_WRAPPER_BREAK] = lightrec_break_cb;
1533
1534         map = &state->maps[PSX_MAP_BIOS];
1535         state->offset_bios = (uintptr_t)map->address - map->pc;
1536
1537         map = &state->maps[PSX_MAP_SCRATCH_PAD];
1538         state->offset_scratch = (uintptr_t)map->address - map->pc;
1539
1540         map = &state->maps[PSX_MAP_KERNEL_USER_RAM];
1541         state->offset_ram = (uintptr_t)map->address - map->pc;
1542
1543         if (state->maps[PSX_MAP_MIRROR1].address == map->address + 0x200000 &&
1544             state->maps[PSX_MAP_MIRROR2].address == map->address + 0x400000 &&
1545             state->maps[PSX_MAP_MIRROR3].address == map->address + 0x600000)
1546                 state->mirrors_mapped = true;
1547
1548         if (state->offset_bios == 0 &&
1549             state->offset_scratch == 0 &&
1550             state->offset_ram == 0 &&
1551             state->mirrors_mapped) {
1552                 pr_info("Memory map is perfect. Emitted code will be best.\n");
1553         } else {
1554                 pr_info("Memory map is sub-par. Emitted code will be slow.\n");
1555         }
1556
1557         return state;
1558
1559 err_free_dispatcher:
1560         lightrec_free_block(state, state->dispatcher);
1561 err_free_reaper:
1562         if (ENABLE_THREADED_COMPILER)
1563                 lightrec_reaper_destroy(state->reaper);
1564 err_free_recompiler:
1565         if (ENABLE_THREADED_COMPILER)
1566                 lightrec_free_recompiler(state->rec);
1567         else
1568                 lightrec_free_cstate(state->cstate);
1569 err_free_block_cache:
1570         lightrec_free_block_cache(state->block_cache);
1571 err_free_tinymm:
1572 #if ENABLE_TINYMM
1573         tinymm_shutdown(state->tinymm);
1574 err_free_state:
1575 #endif
1576         lightrec_unregister(MEM_FOR_LIGHTREC, sizeof(*state) +
1577                             sizeof(*state->code_lut) * CODE_LUT_SIZE);
1578         free(state);
1579 err_finish_jit:
1580         finish_jit();
1581         return NULL;
1582 }
1583
1584 void lightrec_destroy(struct lightrec_state *state)
1585 {
1586         /* Force a print info on destroy*/
1587         state->current_cycle = ~state->current_cycle;
1588         lightrec_print_info(state);
1589
1590         if (ENABLE_THREADED_COMPILER) {
1591                 lightrec_free_recompiler(state->rec);
1592                 lightrec_reaper_destroy(state->reaper);
1593         } else {
1594                 lightrec_free_cstate(state->cstate);
1595         }
1596
1597         lightrec_free_block_cache(state->block_cache);
1598         lightrec_free_block(state, state->dispatcher);
1599         lightrec_free_block(state, state->c_wrapper_block);
1600         finish_jit();
1601
1602 #if ENABLE_TINYMM
1603         tinymm_shutdown(state->tinymm);
1604 #endif
1605         lightrec_unregister(MEM_FOR_LIGHTREC, sizeof(*state) +
1606                             sizeof(*state->code_lut) * CODE_LUT_SIZE);
1607         free(state);
1608 }
1609
1610 void lightrec_invalidate(struct lightrec_state *state, u32 addr, u32 len)
1611 {
1612         u32 kaddr = kunseg(addr & ~0x3);
1613         const struct lightrec_mem_map *map = lightrec_get_map(state, NULL, kaddr);
1614
1615         if (map) {
1616                 if (map != &state->maps[PSX_MAP_KERNEL_USER_RAM])
1617                         return;
1618
1619                 /* Handle mirrors */
1620                 kaddr &= (state->maps[PSX_MAP_KERNEL_USER_RAM].length - 1);
1621
1622                 lightrec_invalidate_map(state, map, kaddr, len);
1623         }
1624 }
1625
1626 void lightrec_invalidate_all(struct lightrec_state *state)
1627 {
1628         memset(state->code_lut, 0, sizeof(*state->code_lut) * CODE_LUT_SIZE);
1629 }
1630
1631 void lightrec_set_invalidate_mode(struct lightrec_state *state, bool dma_only)
1632 {
1633         if (state->invalidate_from_dma_only != dma_only)
1634                 lightrec_invalidate_all(state);
1635
1636         state->invalidate_from_dma_only = dma_only;
1637 }
1638
1639 void lightrec_set_exit_flags(struct lightrec_state *state, u32 flags)
1640 {
1641         if (flags != LIGHTREC_EXIT_NORMAL) {
1642                 state->exit_flags |= flags;
1643                 state->target_cycle = state->current_cycle;
1644         }
1645 }
1646
1647 u32 lightrec_exit_flags(struct lightrec_state *state)
1648 {
1649         return state->exit_flags;
1650 }
1651
1652 u32 lightrec_current_cycle_count(const struct lightrec_state *state)
1653 {
1654         return state->current_cycle;
1655 }
1656
1657 void lightrec_reset_cycle_count(struct lightrec_state *state, u32 cycles)
1658 {
1659         state->current_cycle = cycles;
1660
1661         if (state->target_cycle < cycles)
1662                 state->target_cycle = cycles;
1663 }
1664
1665 void lightrec_set_target_cycle_count(struct lightrec_state *state, u32 cycles)
1666 {
1667         if (state->exit_flags == LIGHTREC_EXIT_NORMAL) {
1668                 if (cycles < state->current_cycle)
1669                         cycles = state->current_cycle;
1670
1671                 state->target_cycle = cycles;
1672         }
1673 }
1674
1675 struct lightrec_registers * lightrec_get_registers(struct lightrec_state *state)
1676 {
1677         return &state->regs;
1678 }