1 /* 2 * Stack-less Just-In-Time compiler 3 * 4 * Copyright 2009-2012 Zoltan Herczeg (hzmester (at) freemail.hu). All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without modification, are 7 * permitted provided that the following conditions are met: 8 * 9 * 1. Redistributions of source code must retain the above copyright notice, this list of 10 * conditions and the following disclaimer. 11 * 12 * 2. Redistributions in binary form must reproduce the above copyright notice, this list 13 * of conditions and the following disclaimer in the documentation and/or other materials 14 * provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) AND CONTRIBUTORS ``AS IS'' AND ANY 17 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT 19 * SHALL THE COPYRIGHT HOLDER(S) OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED 21 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 22 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 23 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 24 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 /* x86 64-bit arch dependent functions. */ 28 29 static sljit_s32 emit_load_imm64(struct sljit_compiler *compiler, sljit_s32 reg, sljit_sw imm) 30 { 31 sljit_u8 *inst; 32 33 inst = (sljit_u8*)ensure_buf(compiler, 1 + 2 + sizeof(sljit_sw)); 34 FAIL_IF(!inst); 35 INC_SIZE(2 + sizeof(sljit_sw)); 36 *inst++ = REX_W | ((reg_map[reg] <= 7) ? 0 : REX_B); 37 *inst++ = MOV_r_i32 + (reg_map[reg] & 0x7); 38 sljit_unaligned_store_sw(inst, imm); 39 return SLJIT_SUCCESS; 40 } 41 42 static sljit_u8* generate_far_jump_code(struct sljit_jump *jump, sljit_u8 *code_ptr, sljit_s32 type) 43 { 44 if (type < SLJIT_JUMP) { 45 /* Invert type. */ 46 *code_ptr++ = get_jump_code(type ^ 0x1) - 0x10; 47 *code_ptr++ = 10 + 3; 48 } 49 50 SLJIT_COMPILE_ASSERT(reg_map[TMP_REG3] == 9, tmp3_is_9_first); 51 *code_ptr++ = REX_W | REX_B; 52 *code_ptr++ = MOV_r_i32 + 1; 53 jump->addr = (sljit_uw)code_ptr; 54 55 if (jump->flags & JUMP_LABEL) 56 jump->flags |= PATCH_MD; 57 else 58 sljit_unaligned_store_sw(code_ptr, jump->u.target); 59 60 code_ptr += sizeof(sljit_sw); 61 *code_ptr++ = REX_B; 62 *code_ptr++ = GROUP_FF; 63 *code_ptr++ = (type >= SLJIT_FAST_CALL) ? (MOD_REG | CALL_rm | 1) : (MOD_REG | JMP_rm | 1); 64 65 return code_ptr; 66 } 67 68 static sljit_u8* generate_fixed_jump(sljit_u8 *code_ptr, sljit_sw addr, sljit_s32 type) 69 { 70 sljit_sw delta = addr - ((sljit_sw)code_ptr + 1 + sizeof(sljit_s32)); 71 72 if (delta <= HALFWORD_MAX && delta >= HALFWORD_MIN) { 73 *code_ptr++ = (type == 2) ? CALL_i32 : JMP_i32; 74 sljit_unaligned_store_sw(code_ptr, delta); 75 } 76 else { 77 SLJIT_COMPILE_ASSERT(reg_map[TMP_REG3] == 9, tmp3_is_9_second); 78 *code_ptr++ = REX_W | REX_B; 79 *code_ptr++ = MOV_r_i32 + 1; 80 sljit_unaligned_store_sw(code_ptr, addr); 81 code_ptr += sizeof(sljit_sw); 82 *code_ptr++ = REX_B; 83 *code_ptr++ = GROUP_FF; 84 *code_ptr++ = (type == 2) ? (MOD_REG | CALL_rm | 1) : (MOD_REG | JMP_rm | 1); 85 } 86 87 return code_ptr; 88 } 89 90 SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_enter(struct sljit_compiler *compiler, 91 sljit_s32 options, sljit_s32 args, sljit_s32 scratches, sljit_s32 saveds, 92 sljit_s32 fscratches, sljit_s32 fsaveds, sljit_s32 local_size) 93 { 94 sljit_s32 i, tmp, size, saved_register_size; 95 sljit_u8 *inst; 96 97 CHECK_ERROR(); 98 CHECK(check_sljit_emit_enter(compiler, options, args, scratches, saveds, fscratches, fsaveds, local_size)); 99 set_emit_enter(compiler, options, args, scratches, saveds, fscratches, fsaveds, local_size); 100 101 compiler->flags_saved = 0; 102 103 /* Including the return address saved by the call instruction. */ 104 saved_register_size = GET_SAVED_REGISTERS_SIZE(scratches, saveds, 1); 105 106 tmp = saveds < SLJIT_NUMBER_OF_SAVED_REGISTERS ? (SLJIT_S0 + 1 - saveds) : SLJIT_FIRST_SAVED_REG; 107 for (i = SLJIT_S0; i >= tmp; i--) { 108 size = reg_map[i] >= 8 ? 2 : 1; 109 inst = (sljit_u8*)ensure_buf(compiler, 1 + size); 110 FAIL_IF(!inst); 111 INC_SIZE(size); 112 if (reg_map[i] >= 8) 113 *inst++ = REX_B; 114 PUSH_REG(reg_lmap[i]); 115 } 116 117 for (i = scratches; i >= SLJIT_FIRST_SAVED_REG; i--) { 118 size = reg_map[i] >= 8 ? 2 : 1; 119 inst = (sljit_u8*)ensure_buf(compiler, 1 + size); 120 FAIL_IF(!inst); 121 INC_SIZE(size); 122 if (reg_map[i] >= 8) 123 *inst++ = REX_B; 124 PUSH_REG(reg_lmap[i]); 125 } 126 127 if (args > 0) { 128 size = args * 3; 129 inst = (sljit_u8*)ensure_buf(compiler, 1 + size); 130 FAIL_IF(!inst); 131 132 INC_SIZE(size); 133 134 #ifndef _WIN64 135 if (args > 0) { 136 *inst++ = REX_W; 137 *inst++ = MOV_r_rm; 138 *inst++ = MOD_REG | (reg_map[SLJIT_S0] << 3) | 0x7 /* rdi */; 139 } 140 if (args > 1) { 141 *inst++ = REX_W | REX_R; 142 *inst++ = MOV_r_rm; 143 *inst++ = MOD_REG | (reg_lmap[SLJIT_S1] << 3) | 0x6 /* rsi */; 144 } 145 if (args > 2) { 146 *inst++ = REX_W | REX_R; 147 *inst++ = MOV_r_rm; 148 *inst++ = MOD_REG | (reg_lmap[SLJIT_S2] << 3) | 0x2 /* rdx */; 149 } 150 #else 151 if (args > 0) { 152 *inst++ = REX_W; 153 *inst++ = MOV_r_rm; 154 *inst++ = MOD_REG | (reg_map[SLJIT_S0] << 3) | 0x1 /* rcx */; 155 } 156 if (args > 1) { 157 *inst++ = REX_W; 158 *inst++ = MOV_r_rm; 159 *inst++ = MOD_REG | (reg_map[SLJIT_S1] << 3) | 0x2 /* rdx */; 160 } 161 if (args > 2) { 162 *inst++ = REX_W | REX_B; 163 *inst++ = MOV_r_rm; 164 *inst++ = MOD_REG | (reg_map[SLJIT_S2] << 3) | 0x0 /* r8 */; 165 } 166 #endif 167 } 168 169 local_size = ((local_size + SLJIT_LOCALS_OFFSET + saved_register_size + 15) & ~15) - saved_register_size; 170 compiler->local_size = local_size; 171 172 #ifdef _WIN64 173 if (local_size > 1024) { 174 /* Allocate stack for the callback, which grows the stack. */ 175 inst = (sljit_u8*)ensure_buf(compiler, 1 + 4 + (3 + sizeof(sljit_s32))); 176 FAIL_IF(!inst); 177 INC_SIZE(4 + (3 + sizeof(sljit_s32))); 178 *inst++ = REX_W; 179 *inst++ = GROUP_BINARY_83; 180 *inst++ = MOD_REG | SUB | 4; 181 /* Allocated size for registers must be divisible by 8. */ 182 SLJIT_ASSERT(!(saved_register_size & 0x7)); 183 /* Aligned to 16 byte. */ 184 if (saved_register_size & 0x8) { 185 *inst++ = 5 * sizeof(sljit_sw); 186 local_size -= 5 * sizeof(sljit_sw); 187 } else { 188 *inst++ = 4 * sizeof(sljit_sw); 189 local_size -= 4 * sizeof(sljit_sw); 190 } 191 /* Second instruction */ 192 SLJIT_COMPILE_ASSERT(reg_map[SLJIT_R0] < 8, temporary_reg1_is_loreg); 193 *inst++ = REX_W; 194 *inst++ = MOV_rm_i32; 195 *inst++ = MOD_REG | reg_lmap[SLJIT_R0]; 196 sljit_unaligned_store_s32(inst, local_size); 197 #if (defined SLJIT_VERBOSE && SLJIT_VERBOSE) \ 198 || (defined SLJIT_ARGUMENT_CHECKS && SLJIT_ARGUMENT_CHECKS) 199 compiler->skip_checks = 1; 200 #endif 201 FAIL_IF(sljit_emit_ijump(compiler, SLJIT_CALL1, SLJIT_IMM, SLJIT_FUNC_OFFSET(sljit_grow_stack))); 202 } 203 #endif 204 205 SLJIT_ASSERT(local_size > 0); 206 if (local_size <= 127) { 207 inst = (sljit_u8*)ensure_buf(compiler, 1 + 4); 208 FAIL_IF(!inst); 209 INC_SIZE(4); 210 *inst++ = REX_W; 211 *inst++ = GROUP_BINARY_83; 212 *inst++ = MOD_REG | SUB | 4; 213 *inst++ = local_size; 214 } 215 else { 216 inst = (sljit_u8*)ensure_buf(compiler, 1 + 7); 217 FAIL_IF(!inst); 218 INC_SIZE(7); 219 *inst++ = REX_W; 220 *inst++ = GROUP_BINARY_81; 221 *inst++ = MOD_REG | SUB | 4; 222 sljit_unaligned_store_s32(inst, local_size); 223 inst += sizeof(sljit_s32); 224 } 225 226 #ifdef _WIN64 227 /* Save xmm6 register: movaps [rsp + 0x20], xmm6 */ 228 if (fscratches >= 6 || fsaveds >= 1) { 229 inst = (sljit_u8*)ensure_buf(compiler, 1 + 5); 230 FAIL_IF(!inst); 231 INC_SIZE(5); 232 *inst++ = GROUP_0F; 233 sljit_unaligned_store_s32(inst, 0x20247429); 234 } 235 #endif 236 237 return SLJIT_SUCCESS; 238 } 239 240 SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_set_context(struct sljit_compiler *compiler, 241 sljit_s32 options, sljit_s32 args, sljit_s32 scratches, sljit_s32 saveds, 242 sljit_s32 fscratches, sljit_s32 fsaveds, sljit_s32 local_size) 243 { 244 sljit_s32 saved_register_size; 245 246 CHECK_ERROR(); 247 CHECK(check_sljit_set_context(compiler, options, args, scratches, saveds, fscratches, fsaveds, local_size)); 248 set_set_context(compiler, options, args, scratches, saveds, fscratches, fsaveds, local_size); 249 250 /* Including the return address saved by the call instruction. */ 251 saved_register_size = GET_SAVED_REGISTERS_SIZE(scratches, saveds, 1); 252 compiler->local_size = ((local_size + SLJIT_LOCALS_OFFSET + saved_register_size + 15) & ~15) - saved_register_size; 253 return SLJIT_SUCCESS; 254 } 255 256 SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_return(struct sljit_compiler *compiler, sljit_s32 op, sljit_s32 src, sljit_sw srcw) 257 { 258 sljit_s32 i, tmp, size; 259 sljit_u8 *inst; 260 261 CHECK_ERROR(); 262 CHECK(check_sljit_emit_return(compiler, op, src, srcw)); 263 264 compiler->flags_saved = 0; 265 FAIL_IF(emit_mov_before_return(compiler, op, src, srcw)); 266 267 #ifdef _WIN64 268 /* Restore xmm6 register: movaps xmm6, [rsp + 0x20] */ 269 if (compiler->fscratches >= 6 || compiler->fsaveds >= 1) { 270 inst = (sljit_u8*)ensure_buf(compiler, 1 + 5); 271 FAIL_IF(!inst); 272 INC_SIZE(5); 273 *inst++ = GROUP_0F; 274 sljit_unaligned_store_s32(inst, 0x20247428); 275 } 276 #endif 277 278 SLJIT_ASSERT(compiler->local_size > 0); 279 if (compiler->local_size <= 127) { 280 inst = (sljit_u8*)ensure_buf(compiler, 1 + 4); 281 FAIL_IF(!inst); 282 INC_SIZE(4); 283 *inst++ = REX_W; 284 *inst++ = GROUP_BINARY_83; 285 *inst++ = MOD_REG | ADD | 4; 286 *inst = compiler->local_size; 287 } 288 else { 289 inst = (sljit_u8*)ensure_buf(compiler, 1 + 7); 290 FAIL_IF(!inst); 291 INC_SIZE(7); 292 *inst++ = REX_W; 293 *inst++ = GROUP_BINARY_81; 294 *inst++ = MOD_REG | ADD | 4; 295 sljit_unaligned_store_s32(inst, compiler->local_size); 296 } 297 298 tmp = compiler->scratches; 299 for (i = SLJIT_FIRST_SAVED_REG; i <= tmp; i++) { 300 size = reg_map[i] >= 8 ? 2 : 1; 301 inst = (sljit_u8*)ensure_buf(compiler, 1 + size); 302 FAIL_IF(!inst); 303 INC_SIZE(size); 304 if (reg_map[i] >= 8) 305 *inst++ = REX_B; 306 POP_REG(reg_lmap[i]); 307 } 308 309 tmp = compiler->saveds < SLJIT_NUMBER_OF_SAVED_REGISTERS ? (SLJIT_S0 + 1 - compiler->saveds) : SLJIT_FIRST_SAVED_REG; 310 for (i = tmp; i <= SLJIT_S0; i++) { 311 size = reg_map[i] >= 8 ? 2 : 1; 312 inst = (sljit_u8*)ensure_buf(compiler, 1 + size); 313 FAIL_IF(!inst); 314 INC_SIZE(size); 315 if (reg_map[i] >= 8) 316 *inst++ = REX_B; 317 POP_REG(reg_lmap[i]); 318 } 319 320 inst = (sljit_u8*)ensure_buf(compiler, 1 + 1); 321 FAIL_IF(!inst); 322 INC_SIZE(1); 323 RET(); 324 return SLJIT_SUCCESS; 325 } 326 327 /* --------------------------------------------------------------------- */ 328 /* Operators */ 329 /* --------------------------------------------------------------------- */ 330 331 static sljit_s32 emit_do_imm32(struct sljit_compiler *compiler, sljit_u8 rex, sljit_u8 opcode, sljit_sw imm) 332 { 333 sljit_u8 *inst; 334 sljit_s32 length = 1 + (rex ? 1 : 0) + sizeof(sljit_s32); 335 336 inst = (sljit_u8*)ensure_buf(compiler, 1 + length); 337 FAIL_IF(!inst); 338 INC_SIZE(length); 339 if (rex) 340 *inst++ = rex; 341 *inst++ = opcode; 342 sljit_unaligned_store_s32(inst, imm); 343 return SLJIT_SUCCESS; 344 } 345 346 static sljit_u8* emit_x86_instruction(struct sljit_compiler *compiler, sljit_s32 size, 347 /* The register or immediate operand. */ 348 sljit_s32 a, sljit_sw imma, 349 /* The general operand (not immediate). */ 350 sljit_s32 b, sljit_sw immb) 351 { 352 sljit_u8 *inst; 353 sljit_u8 *buf_ptr; 354 sljit_u8 rex = 0; 355 sljit_s32 flags = size & ~0xf; 356 sljit_s32 inst_size; 357 358 /* The immediate operand must be 32 bit. */ 359 SLJIT_ASSERT(!(a & SLJIT_IMM) || compiler->mode32 || IS_HALFWORD(imma)); 360 /* Both cannot be switched on. */ 361 SLJIT_ASSERT((flags & (EX86_BIN_INS | EX86_SHIFT_INS)) != (EX86_BIN_INS | EX86_SHIFT_INS)); 362 /* Size flags not allowed for typed instructions. */ 363 SLJIT_ASSERT(!(flags & (EX86_BIN_INS | EX86_SHIFT_INS)) || (flags & (EX86_BYTE_ARG | EX86_HALF_ARG)) == 0); 364 /* Both size flags cannot be switched on. */ 365 SLJIT_ASSERT((flags & (EX86_BYTE_ARG | EX86_HALF_ARG)) != (EX86_BYTE_ARG | EX86_HALF_ARG)); 366 /* SSE2 and immediate is not possible. */ 367 SLJIT_ASSERT(!(a & SLJIT_IMM) || !(flags & EX86_SSE2)); 368 SLJIT_ASSERT((flags & (EX86_PREF_F2 | EX86_PREF_F3)) != (EX86_PREF_F2 | EX86_PREF_F3) 369 && (flags & (EX86_PREF_F2 | EX86_PREF_66)) != (EX86_PREF_F2 | EX86_PREF_66) 370 && (flags & (EX86_PREF_F3 | EX86_PREF_66)) != (EX86_PREF_F3 | EX86_PREF_66)); 371 372 size &= 0xf; 373 inst_size = size; 374 375 if (!compiler->mode32 && !(flags & EX86_NO_REXW)) 376 rex |= REX_W; 377 else if (flags & EX86_REX) 378 rex |= REX; 379 380 if (flags & (EX86_PREF_F2 | EX86_PREF_F3)) 381 inst_size++; 382 if (flags & EX86_PREF_66) 383 inst_size++; 384 385 /* Calculate size of b. */ 386 inst_size += 1; /* mod r/m byte. */ 387 if (b & SLJIT_MEM) { 388 if (!(b & OFFS_REG_MASK)) { 389 if (NOT_HALFWORD(immb)) { 390 if (emit_load_imm64(compiler, TMP_REG3, immb)) 391 return NULL; 392 immb = 0; 393 if (b & REG_MASK) 394 b |= TO_OFFS_REG(TMP_REG3); 395 else 396 b |= TMP_REG3; 397 } 398 else if (reg_lmap[b & REG_MASK] == 4) 399 b |= TO_OFFS_REG(SLJIT_SP); 400 } 401 402 if ((b & REG_MASK) == SLJIT_UNUSED) 403 inst_size += 1 + sizeof(sljit_s32); /* SIB byte required to avoid RIP based addressing. */ 404 else { 405 if (reg_map[b & REG_MASK] >= 8) 406 rex |= REX_B; 407 408 if (immb != 0 && (!(b & OFFS_REG_MASK) || (b & OFFS_REG_MASK) == TO_OFFS_REG(SLJIT_SP))) { 409 /* Immediate operand. */ 410 if (immb <= 127 && immb >= -128) 411 inst_size += sizeof(sljit_s8); 412 else 413 inst_size += sizeof(sljit_s32); 414 } 415 else if (reg_lmap[b & REG_MASK] == 5) 416 inst_size += sizeof(sljit_s8); 417 418 if ((b & OFFS_REG_MASK) != SLJIT_UNUSED) { 419 inst_size += 1; /* SIB byte. */ 420 if (reg_map[OFFS_REG(b)] >= 8) 421 rex |= REX_X; 422 } 423 } 424 } 425 else if (!(flags & EX86_SSE2_OP2) && reg_map[b] >= 8) 426 rex |= REX_B; 427 428 if (a & SLJIT_IMM) { 429 if (flags & EX86_BIN_INS) { 430 if (imma <= 127 && imma >= -128) { 431 inst_size += 1; 432 flags |= EX86_BYTE_ARG; 433 } else 434 inst_size += 4; 435 } 436 else if (flags & EX86_SHIFT_INS) { 437 imma &= compiler->mode32 ? 0x1f : 0x3f; 438 if (imma != 1) { 439 inst_size ++; 440 flags |= EX86_BYTE_ARG; 441 } 442 } else if (flags & EX86_BYTE_ARG) 443 inst_size++; 444 else if (flags & EX86_HALF_ARG) 445 inst_size += sizeof(short); 446 else 447 inst_size += sizeof(sljit_s32); 448 } 449 else { 450 SLJIT_ASSERT(!(flags & EX86_SHIFT_INS) || a == SLJIT_PREF_SHIFT_REG); 451 /* reg_map[SLJIT_PREF_SHIFT_REG] is less than 8. */ 452 if (!(flags & EX86_SSE2_OP1) && reg_map[a] >= 8) 453 rex |= REX_R; 454 } 455 456 if (rex) 457 inst_size++; 458 459 inst = (sljit_u8*)ensure_buf(compiler, 1 + inst_size); 460 PTR_FAIL_IF(!inst); 461 462 /* Encoding the byte. */ 463 INC_SIZE(inst_size); 464 if (flags & EX86_PREF_F2) 465 *inst++ = 0xf2; 466 if (flags & EX86_PREF_F3) 467 *inst++ = 0xf3; 468 if (flags & EX86_PREF_66) 469 *inst++ = 0x66; 470 if (rex) 471 *inst++ = rex; 472 buf_ptr = inst + size; 473 474 /* Encode mod/rm byte. */ 475 if (!(flags & EX86_SHIFT_INS)) { 476 if ((flags & EX86_BIN_INS) && (a & SLJIT_IMM)) 477 *inst = (flags & EX86_BYTE_ARG) ? GROUP_BINARY_83 : GROUP_BINARY_81; 478 479 if ((a & SLJIT_IMM) || (a == 0)) 480 *buf_ptr = 0; 481 else if (!(flags & EX86_SSE2_OP1)) 482 *buf_ptr = reg_lmap[a] << 3; 483 else 484 *buf_ptr = a << 3; 485 } 486 else { 487 if (a & SLJIT_IMM) { 488 if (imma == 1) 489 *inst = GROUP_SHIFT_1; 490 else 491 *inst = GROUP_SHIFT_N; 492 } else 493 *inst = GROUP_SHIFT_CL; 494 *buf_ptr = 0; 495 } 496 497 if (!(b & SLJIT_MEM)) 498 *buf_ptr++ |= MOD_REG + ((!(flags & EX86_SSE2_OP2)) ? reg_lmap[b] : b); 499 else if ((b & REG_MASK) != SLJIT_UNUSED) { 500 if ((b & OFFS_REG_MASK) == SLJIT_UNUSED || (b & OFFS_REG_MASK) == TO_OFFS_REG(SLJIT_SP)) { 501 if (immb != 0 || reg_lmap[b & REG_MASK] == 5) { 502 if (immb <= 127 && immb >= -128) 503 *buf_ptr |= 0x40; 504 else 505 *buf_ptr |= 0x80; 506 } 507 508 if ((b & OFFS_REG_MASK) == SLJIT_UNUSED) 509 *buf_ptr++ |= reg_lmap[b & REG_MASK]; 510 else { 511 *buf_ptr++ |= 0x04; 512 *buf_ptr++ = reg_lmap[b & REG_MASK] | (reg_lmap[OFFS_REG(b)] << 3); 513 } 514 515 if (immb != 0 || reg_lmap[b & REG_MASK] == 5) { 516 if (immb <= 127 && immb >= -128) 517 *buf_ptr++ = immb; /* 8 bit displacement. */ 518 else { 519 sljit_unaligned_store_s32(buf_ptr, immb); /* 32 bit displacement. */ 520 buf_ptr += sizeof(sljit_s32); 521 } 522 } 523 } 524 else { 525 if (reg_lmap[b & REG_MASK] == 5) 526 *buf_ptr |= 0x40; 527 *buf_ptr++ |= 0x04; 528 *buf_ptr++ = reg_lmap[b & REG_MASK] | (reg_lmap[OFFS_REG(b)] << 3) | (immb << 6); 529 if (reg_lmap[b & REG_MASK] == 5) 530 *buf_ptr++ = 0; 531 } 532 } 533 else { 534 *buf_ptr++ |= 0x04; 535 *buf_ptr++ = 0x25; 536 sljit_unaligned_store_s32(buf_ptr, immb); /* 32 bit displacement. */ 537 buf_ptr += sizeof(sljit_s32); 538 } 539 540 if (a & SLJIT_IMM) { 541 if (flags & EX86_BYTE_ARG) 542 *buf_ptr = imma; 543 else if (flags & EX86_HALF_ARG) 544 sljit_unaligned_store_s16(buf_ptr, imma); 545 else if (!(flags & EX86_SHIFT_INS)) 546 sljit_unaligned_store_s32(buf_ptr, imma); 547 } 548 549 return !(flags & EX86_SHIFT_INS) ? inst : (inst + 1); 550 } 551 552 /* --------------------------------------------------------------------- */ 553 /* Call / return instructions */ 554 /* --------------------------------------------------------------------- */ 555 556 static SLJIT_INLINE sljit_s32 call_with_args(struct sljit_compiler *compiler, sljit_s32 type) 557 { 558 sljit_u8 *inst; 559 560 #ifndef _WIN64 561 SLJIT_COMPILE_ASSERT(reg_map[SLJIT_R1] == 6 && reg_map[SLJIT_R0] < 8 && reg_map[SLJIT_R2] < 8, args_registers); 562 563 inst = (sljit_u8*)ensure_buf(compiler, 1 + ((type < SLJIT_CALL3) ? 3 : 6)); 564 FAIL_IF(!inst); 565 INC_SIZE((type < SLJIT_CALL3) ? 3 : 6); 566 if (type >= SLJIT_CALL3) { 567 *inst++ = REX_W; 568 *inst++ = MOV_r_rm; 569 *inst++ = MOD_REG | (0x2 /* rdx */ << 3) | reg_lmap[SLJIT_R2]; 570 } 571 *inst++ = REX_W; 572 *inst++ = MOV_r_rm; 573 *inst++ = MOD_REG | (0x7 /* rdi */ << 3) | reg_lmap[SLJIT_R0]; 574 #else 575 SLJIT_COMPILE_ASSERT(reg_map[SLJIT_R1] == 2 && reg_map[SLJIT_R0] < 8 && reg_map[SLJIT_R2] < 8, args_registers); 576 577 inst = (sljit_u8*)ensure_buf(compiler, 1 + ((type < SLJIT_CALL3) ? 3 : 6)); 578 FAIL_IF(!inst); 579 INC_SIZE((type < SLJIT_CALL3) ? 3 : 6); 580 if (type >= SLJIT_CALL3) { 581 *inst++ = REX_W | REX_R; 582 *inst++ = MOV_r_rm; 583 *inst++ = MOD_REG | (0x0 /* r8 */ << 3) | reg_lmap[SLJIT_R2]; 584 } 585 *inst++ = REX_W; 586 *inst++ = MOV_r_rm; 587 *inst++ = MOD_REG | (0x1 /* rcx */ << 3) | reg_lmap[SLJIT_R0]; 588 #endif 589 return SLJIT_SUCCESS; 590 } 591 592 SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_fast_enter(struct sljit_compiler *compiler, sljit_s32 dst, sljit_sw dstw) 593 { 594 sljit_u8 *inst; 595 596 CHECK_ERROR(); 597 CHECK(check_sljit_emit_fast_enter(compiler, dst, dstw)); 598 ADJUST_LOCAL_OFFSET(dst, dstw); 599 600 /* For UNUSED dst. Uncommon, but possible. */ 601 if (dst == SLJIT_UNUSED) 602 dst = TMP_REG1; 603 604 if (FAST_IS_REG(dst)) { 605 if (reg_map[dst] < 8) { 606 inst = (sljit_u8*)ensure_buf(compiler, 1 + 1); 607 FAIL_IF(!inst); 608 INC_SIZE(1); 609 POP_REG(reg_lmap[dst]); 610 return SLJIT_SUCCESS; 611 } 612 613 inst = (sljit_u8*)ensure_buf(compiler, 1 + 2); 614 FAIL_IF(!inst); 615 INC_SIZE(2); 616 *inst++ = REX_B; 617 POP_REG(reg_lmap[dst]); 618 return SLJIT_SUCCESS; 619 } 620 621 /* REX_W is not necessary (src is not immediate). */ 622 compiler->mode32 = 1; 623 inst = emit_x86_instruction(compiler, 1, 0, 0, dst, dstw); 624 FAIL_IF(!inst); 625 *inst++ = POP_rm; 626 return SLJIT_SUCCESS; 627 } 628 629 SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_fast_return(struct sljit_compiler *compiler, sljit_s32 src, sljit_sw srcw) 630 { 631 sljit_u8 *inst; 632 633 CHECK_ERROR(); 634 CHECK(check_sljit_emit_fast_return(compiler, src, srcw)); 635 ADJUST_LOCAL_OFFSET(src, srcw); 636 637 if ((src & SLJIT_IMM) && NOT_HALFWORD(srcw)) { 638 FAIL_IF(emit_load_imm64(compiler, TMP_REG1, srcw)); 639 src = TMP_REG1; 640 } 641 642 if (FAST_IS_REG(src)) { 643 if (reg_map[src] < 8) { 644 inst = (sljit_u8*)ensure_buf(compiler, 1 + 1 + 1); 645 FAIL_IF(!inst); 646 647 INC_SIZE(1 + 1); 648 PUSH_REG(reg_lmap[src]); 649 } 650 else { 651 inst = (sljit_u8*)ensure_buf(compiler, 1 + 2 + 1); 652 FAIL_IF(!inst); 653 654 INC_SIZE(2 + 1); 655 *inst++ = REX_B; 656 PUSH_REG(reg_lmap[src]); 657 } 658 } 659 else if (src & SLJIT_MEM) { 660 /* REX_W is not necessary (src is not immediate). */ 661 compiler->mode32 = 1; 662 inst = emit_x86_instruction(compiler, 1, 0, 0, src, srcw); 663 FAIL_IF(!inst); 664 *inst++ = GROUP_FF; 665 *inst |= PUSH_rm; 666 667 inst = (sljit_u8*)ensure_buf(compiler, 1 + 1); 668 FAIL_IF(!inst); 669 INC_SIZE(1); 670 } 671 else { 672 SLJIT_ASSERT(IS_HALFWORD(srcw)); 673 /* SLJIT_IMM. */ 674 inst = (sljit_u8*)ensure_buf(compiler, 1 + 5 + 1); 675 FAIL_IF(!inst); 676 677 INC_SIZE(5 + 1); 678 *inst++ = PUSH_i32; 679 sljit_unaligned_store_s32(inst, srcw); 680 inst += sizeof(sljit_s32); 681 } 682 683 RET(); 684 return SLJIT_SUCCESS; 685 } 686 687 688 /* --------------------------------------------------------------------- */ 689 /* Extend input */ 690 /* --------------------------------------------------------------------- */ 691 692 static sljit_s32 emit_mov_int(struct sljit_compiler *compiler, sljit_s32 sign, 693 sljit_s32 dst, sljit_sw dstw, 694 sljit_s32 src, sljit_sw srcw) 695 { 696 sljit_u8* inst; 697 sljit_s32 dst_r; 698 699 compiler->mode32 = 0; 700 701 if (dst == SLJIT_UNUSED && !(src & SLJIT_MEM)) 702 return SLJIT_SUCCESS; /* Empty instruction. */ 703 704 if (src & SLJIT_IMM) { 705 if (FAST_IS_REG(dst)) { 706 if (sign || ((sljit_uw)srcw <= 0x7fffffff)) { 707 inst = emit_x86_instruction(compiler, 1, SLJIT_IMM, (sljit_sw)(sljit_s32)srcw, dst, dstw); 708 FAIL_IF(!inst); 709 *inst = MOV_rm_i32; 710 return SLJIT_SUCCESS; 711 } 712 return emit_load_imm64(compiler, dst, srcw); 713 } 714 compiler->mode32 = 1; 715 inst = emit_x86_instruction(compiler, 1, SLJIT_IMM, (sljit_sw)(sljit_s32)srcw, dst, dstw); 716 FAIL_IF(!inst); 717 *inst = MOV_rm_i32; 718 compiler->mode32 = 0; 719 return SLJIT_SUCCESS; 720 } 721 722 dst_r = FAST_IS_REG(dst) ? dst : TMP_REG1; 723 724 if ((dst & SLJIT_MEM) && FAST_IS_REG(src)) 725 dst_r = src; 726 else { 727 if (sign) { 728 inst = emit_x86_instruction(compiler, 1, dst_r, 0, src, srcw); 729 FAIL_IF(!inst); 730 *inst++ = MOVSXD_r_rm; 731 } else { 732 compiler->mode32 = 1; 733 FAIL_IF(emit_mov(compiler, dst_r, 0, src, srcw)); 734 compiler->mode32 = 0; 735 } 736 } 737 738 if (dst & SLJIT_MEM) { 739 compiler->mode32 = 1; 740 inst = emit_x86_instruction(compiler, 1, dst_r, 0, dst, dstw); 741 FAIL_IF(!inst); 742 *inst = MOV_rm_r; 743 compiler->mode32 = 0; 744 } 745 746 return SLJIT_SUCCESS; 747 } 748
