1 /*
2 * Stack-less Just-In-Time compiler
3 *
4 * Copyright 2009-2012 Zoltan Herczeg (hzmester@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
emit_load_imm64(struct sljit_compiler * compiler,sljit_si reg,sljit_sw imm)29 static sljit_si emit_load_imm64(struct sljit_compiler *compiler, sljit_si reg, sljit_sw imm)
30 {
31 sljit_ub *inst;
32
33 inst = (sljit_ub*)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_sw*)inst = imm;
39 return SLJIT_SUCCESS;
40 }
41
generate_far_jump_code(struct sljit_jump * jump,sljit_ub * code_ptr,sljit_si type)42 static sljit_ub* generate_far_jump_code(struct sljit_jump *jump, sljit_ub *code_ptr, sljit_si 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_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
generate_fixed_jump(sljit_ub * code_ptr,sljit_sw addr,sljit_si type)68 static sljit_ub* generate_fixed_jump(sljit_ub *code_ptr, sljit_sw addr, sljit_si type)
69 {
70 sljit_sw delta = addr - ((sljit_sw)code_ptr + 1 + sizeof(sljit_si));
71
72 if (delta <= HALFWORD_MAX && delta >= HALFWORD_MIN) {
73 *code_ptr++ = (type == 2) ? CALL_i32 : JMP_i32;
74 *(sljit_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_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
sljit_emit_enter(struct sljit_compiler * compiler,sljit_si options,sljit_si args,sljit_si scratches,sljit_si saveds,sljit_si fscratches,sljit_si fsaveds,sljit_si local_size)90 SLJIT_API_FUNC_ATTRIBUTE sljit_si sljit_emit_enter(struct sljit_compiler *compiler,
91 sljit_si options, sljit_si args, sljit_si scratches, sljit_si saveds,
92 sljit_si fscratches, sljit_si fsaveds, sljit_si local_size)
93 {
94 sljit_si i, tmp, size, saved_register_size;
95 sljit_ub *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_ub*)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_ub*)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_ub*)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_ub*)ensure_buf(compiler, 1 + 4 + (3 + sizeof(sljit_si)));
176 FAIL_IF(!inst);
177 INC_SIZE(4 + (3 + sizeof(sljit_si)));
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_si*)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_ub*)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_ub*)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_si*)inst = local_size;
223 inst += sizeof(sljit_si);
224 }
225
226 #ifdef _WIN64
227 /* Save xmm6 register: movaps [rsp + 0x20], xmm6 */
228 if (fscratches >= 6 || fsaveds >= 1) {
229 inst = (sljit_ub*)ensure_buf(compiler, 1 + 5);
230 FAIL_IF(!inst);
231 INC_SIZE(5);
232 *inst++ = GROUP_0F;
233 *(sljit_si*)inst = 0x20247429;
234 }
235 #endif
236
237 return SLJIT_SUCCESS;
238 }
239
sljit_set_context(struct sljit_compiler * compiler,sljit_si options,sljit_si args,sljit_si scratches,sljit_si saveds,sljit_si fscratches,sljit_si fsaveds,sljit_si local_size)240 SLJIT_API_FUNC_ATTRIBUTE sljit_si sljit_set_context(struct sljit_compiler *compiler,
241 sljit_si options, sljit_si args, sljit_si scratches, sljit_si saveds,
242 sljit_si fscratches, sljit_si fsaveds, sljit_si local_size)
243 {
244 sljit_si 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
sljit_emit_return(struct sljit_compiler * compiler,sljit_si op,sljit_si src,sljit_sw srcw)256 SLJIT_API_FUNC_ATTRIBUTE sljit_si sljit_emit_return(struct sljit_compiler *compiler, sljit_si op, sljit_si src, sljit_sw srcw)
257 {
258 sljit_si i, tmp, size;
259 sljit_ub *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_ub*)ensure_buf(compiler, 1 + 5);
271 FAIL_IF(!inst);
272 INC_SIZE(5);
273 *inst++ = GROUP_0F;
274 *(sljit_si*)inst = 0x20247428;
275 }
276 #endif
277
278 SLJIT_ASSERT(compiler->local_size > 0);
279 if (compiler->local_size <= 127) {
280 inst = (sljit_ub*)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_ub*)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_si*)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_ub*)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_ub*)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_ub*)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
emit_do_imm32(struct sljit_compiler * compiler,sljit_ub rex,sljit_ub opcode,sljit_sw imm)331 static sljit_si emit_do_imm32(struct sljit_compiler *compiler, sljit_ub rex, sljit_ub opcode, sljit_sw imm)
332 {
333 sljit_ub *inst;
334 sljit_si length = 1 + (rex ? 1 : 0) + sizeof(sljit_si);
335
336 inst = (sljit_ub*)ensure_buf(compiler, 1 + length);
337 FAIL_IF(!inst);
338 INC_SIZE(length);
339 if (rex)
340 *inst++ = rex;
341 *inst++ = opcode;
342 *(sljit_si*)inst = imm;
343 return SLJIT_SUCCESS;
344 }
345
emit_x86_instruction(struct sljit_compiler * compiler,sljit_si size,sljit_si a,sljit_sw imma,sljit_si b,sljit_sw immb)346 static sljit_ub* emit_x86_instruction(struct sljit_compiler *compiler, sljit_si size,
347 /* The register or immediate operand. */
348 sljit_si a, sljit_sw imma,
349 /* The general operand (not immediate). */
350 sljit_si b, sljit_sw immb)
351 {
352 sljit_ub *inst;
353 sljit_ub *buf_ptr;
354 sljit_ub rex = 0;
355 sljit_si flags = size & ~0xf;
356 sljit_si 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_si); /* 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_sb);
412 else
413 inst_size += sizeof(sljit_si);
414 }
415 else if (reg_lmap[b & REG_MASK] == 5)
416 inst_size += sizeof(sljit_sb);
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_si);
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_ub*)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_si*)buf_ptr = immb; /* 32 bit displacement. */
520 buf_ptr += sizeof(sljit_si);
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_si*)buf_ptr = immb; /* 32 bit displacement. */
537 buf_ptr += sizeof(sljit_si);
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 *(short*)buf_ptr = imma;
545 else if (!(flags & EX86_SHIFT_INS))
546 *(sljit_si*)buf_ptr = imma;
547 }
548
549 return !(flags & EX86_SHIFT_INS) ? inst : (inst + 1);
550 }
551
552 /* --------------------------------------------------------------------- */
553 /* Call / return instructions */
554 /* --------------------------------------------------------------------- */
555
call_with_args(struct sljit_compiler * compiler,sljit_si type)556 static SLJIT_INLINE sljit_si call_with_args(struct sljit_compiler *compiler, sljit_si type)
557 {
558 sljit_ub *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_ub*)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_ub*)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
sljit_emit_fast_enter(struct sljit_compiler * compiler,sljit_si dst,sljit_sw dstw)592 SLJIT_API_FUNC_ATTRIBUTE sljit_si sljit_emit_fast_enter(struct sljit_compiler *compiler, sljit_si dst, sljit_sw dstw)
593 {
594 sljit_ub *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_ub*)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_ub*)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
sljit_emit_fast_return(struct sljit_compiler * compiler,sljit_si src,sljit_sw srcw)629 SLJIT_API_FUNC_ATTRIBUTE sljit_si sljit_emit_fast_return(struct sljit_compiler *compiler, sljit_si src, sljit_sw srcw)
630 {
631 sljit_ub *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_ub*)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_ub*)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_ub*)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_ub*)ensure_buf(compiler, 1 + 5 + 1);
675 FAIL_IF(!inst);
676
677 INC_SIZE(5 + 1);
678 *inst++ = PUSH_i32;
679 *(sljit_si*)inst = srcw;
680 inst += sizeof(sljit_si);
681 }
682
683 RET();
684 return SLJIT_SUCCESS;
685 }
686
687
688 /* --------------------------------------------------------------------- */
689 /* Extend input */
690 /* --------------------------------------------------------------------- */
691
emit_mov_int(struct sljit_compiler * compiler,sljit_si sign,sljit_si dst,sljit_sw dstw,sljit_si src,sljit_sw srcw)692 static sljit_si emit_mov_int(struct sljit_compiler *compiler, sljit_si sign,
693 sljit_si dst, sljit_sw dstw,
694 sljit_si src, sljit_sw srcw)
695 {
696 sljit_ub* inst;
697 sljit_si 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_si)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_si)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
