1 /* $NetBSD: sljitNativeX86_64.c,v 1.4 2019/01/20 23:14:16 alnsn Exp $ */
2
3 /*
4 * Stack-less Just-In-Time compiler
5 *
6 * Copyright Zoltan Herczeg (hzmester@freemail.hu). All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without modification, are
9 * permitted provided that the following conditions are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright notice, this list of
12 * conditions and the following disclaimer.
13 *
14 * 2. Redistributions in binary form must reproduce the above copyright notice, this list
15 * of conditions and the following disclaimer in the documentation and/or other materials
16 * provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) AND CONTRIBUTORS ``AS IS'' AND ANY
19 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
21 * SHALL THE COPYRIGHT HOLDER(S) OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
23 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
24 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
25 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
26 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 /* x86 64-bit arch dependent functions. */
30
emit_load_imm64(struct sljit_compiler * compiler,sljit_s32 reg,sljit_sw imm)31 static sljit_s32 emit_load_imm64(struct sljit_compiler *compiler, sljit_s32 reg, sljit_sw imm)
32 {
33 sljit_u8 *inst;
34
35 inst = (sljit_u8*)ensure_buf(compiler, 1 + 2 + sizeof(sljit_sw));
36 FAIL_IF(!inst);
37 INC_SIZE(2 + sizeof(sljit_sw));
38 *inst++ = REX_W | ((reg_map[reg] <= 7) ? 0 : REX_B);
39 *inst++ = MOV_r_i32 + (reg_map[reg] & 0x7);
40 sljit_unaligned_store_sw(inst, imm);
41 return SLJIT_SUCCESS;
42 }
43
generate_far_jump_code(struct sljit_jump * jump,sljit_u8 * code_ptr,sljit_s32 type)44 static sljit_u8* generate_far_jump_code(struct sljit_jump *jump, sljit_u8 *code_ptr, sljit_s32 type)
45 {
46 if (type < SLJIT_JUMP) {
47 /* Invert type. */
48 *code_ptr++ = get_jump_code(type ^ 0x1) - 0x10;
49 *code_ptr++ = 10 + 3;
50 }
51
52 SLJIT_ASSERT(reg_map[TMP_REG3] == 9);
53 *code_ptr++ = REX_W | REX_B;
54 *code_ptr++ = MOV_r_i32 + 1;
55 jump->addr = (sljit_uw)code_ptr;
56
57 if (jump->flags & JUMP_LABEL)
58 jump->flags |= PATCH_MD;
59 else
60 sljit_unaligned_store_sw(code_ptr, jump->u.target);
61
62 code_ptr += sizeof(sljit_sw);
63 *code_ptr++ = REX_B;
64 *code_ptr++ = GROUP_FF;
65 *code_ptr++ = (type >= SLJIT_FAST_CALL) ? (MOD_REG | CALL_rm | 1) : (MOD_REG | JMP_rm | 1);
66
67 return code_ptr;
68 }
69
sljit_emit_enter(struct sljit_compiler * compiler,sljit_s32 options,sljit_s32 args,sljit_s32 scratches,sljit_s32 saveds,sljit_s32 fscratches,sljit_s32 fsaveds,sljit_s32 local_size)70 SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_enter(struct sljit_compiler *compiler,
71 sljit_s32 options, sljit_s32 args, sljit_s32 scratches, sljit_s32 saveds,
72 sljit_s32 fscratches, sljit_s32 fsaveds, sljit_s32 local_size)
73 {
74 sljit_s32 i, tmp, size, saved_register_size;
75 sljit_u8 *inst;
76
77 CHECK_ERROR();
78 CHECK(check_sljit_emit_enter(compiler, options, args, scratches, saveds, fscratches, fsaveds, local_size));
79 set_emit_enter(compiler, options, args, scratches, saveds, fscratches, fsaveds, local_size);
80
81 #ifdef _WIN64
82 /* Two/four register slots for parameters plus space for xmm6 register if needed. */
83 if (fscratches >= 6 || fsaveds >= 1)
84 compiler->locals_offset = 6 * sizeof(sljit_sw);
85 else
86 compiler->locals_offset = ((scratches > 2) ? 4 : 2) * sizeof(sljit_sw);
87 #endif
88
89 /* Including the return address saved by the call instruction. */
90 saved_register_size = GET_SAVED_REGISTERS_SIZE(scratches, saveds, 1);
91
92 tmp = saveds < SLJIT_NUMBER_OF_SAVED_REGISTERS ? (SLJIT_S0 + 1 - saveds) : SLJIT_FIRST_SAVED_REG;
93 for (i = SLJIT_S0; i >= tmp; i--) {
94 size = reg_map[i] >= 8 ? 2 : 1;
95 inst = (sljit_u8*)ensure_buf(compiler, 1 + size);
96 FAIL_IF(!inst);
97 INC_SIZE(size);
98 if (reg_map[i] >= 8)
99 *inst++ = REX_B;
100 PUSH_REG(reg_lmap[i]);
101 }
102
103 for (i = scratches; i >= SLJIT_FIRST_SAVED_REG; i--) {
104 size = reg_map[i] >= 8 ? 2 : 1;
105 inst = (sljit_u8*)ensure_buf(compiler, 1 + size);
106 FAIL_IF(!inst);
107 INC_SIZE(size);
108 if (reg_map[i] >= 8)
109 *inst++ = REX_B;
110 PUSH_REG(reg_lmap[i]);
111 }
112
113 if (args > 0) {
114 size = args * 3;
115 inst = (sljit_u8*)ensure_buf(compiler, 1 + size);
116 FAIL_IF(!inst);
117
118 INC_SIZE(size);
119
120 #ifndef _WIN64
121 if (args > 0) {
122 *inst++ = REX_W;
123 *inst++ = MOV_r_rm;
124 *inst++ = MOD_REG | (reg_map[SLJIT_S0] << 3) | 0x7 /* rdi */;
125 }
126 if (args > 1) {
127 *inst++ = REX_W | REX_R;
128 *inst++ = MOV_r_rm;
129 *inst++ = MOD_REG | (reg_lmap[SLJIT_S1] << 3) | 0x6 /* rsi */;
130 }
131 if (args > 2) {
132 *inst++ = REX_W | REX_R;
133 *inst++ = MOV_r_rm;
134 *inst++ = MOD_REG | (reg_lmap[SLJIT_S2] << 3) | 0x2 /* rdx */;
135 }
136 #else
137 if (args > 0) {
138 *inst++ = REX_W;
139 *inst++ = MOV_r_rm;
140 *inst++ = MOD_REG | (reg_map[SLJIT_S0] << 3) | 0x1 /* rcx */;
141 }
142 if (args > 1) {
143 *inst++ = REX_W;
144 *inst++ = MOV_r_rm;
145 *inst++ = MOD_REG | (reg_map[SLJIT_S1] << 3) | 0x2 /* rdx */;
146 }
147 if (args > 2) {
148 *inst++ = REX_W | REX_B;
149 *inst++ = MOV_r_rm;
150 *inst++ = MOD_REG | (reg_map[SLJIT_S2] << 3) | 0x0 /* r8 */;
151 }
152 #endif
153 }
154
155 local_size = ((local_size + SLJIT_LOCALS_OFFSET + saved_register_size + 15) & ~15) - saved_register_size;
156 compiler->local_size = local_size;
157
158 #ifdef _WIN64
159 if (local_size > 1024) {
160 /* Allocate stack for the callback, which grows the stack. */
161 inst = (sljit_u8*)ensure_buf(compiler, 1 + 4 + (3 + sizeof(sljit_s32)));
162 FAIL_IF(!inst);
163 INC_SIZE(4 + (3 + sizeof(sljit_s32)));
164 *inst++ = REX_W;
165 *inst++ = GROUP_BINARY_83;
166 *inst++ = MOD_REG | SUB | reg_map[SLJIT_SP];
167 /* Allocated size for registers must be divisible by 8. */
168 SLJIT_ASSERT(!(saved_register_size & 0x7));
169 /* Aligned to 16 byte. */
170 if (saved_register_size & 0x8) {
171 *inst++ = 5 * sizeof(sljit_sw);
172 local_size -= 5 * sizeof(sljit_sw);
173 } else {
174 *inst++ = 4 * sizeof(sljit_sw);
175 local_size -= 4 * sizeof(sljit_sw);
176 }
177 /* Second instruction */
178 SLJIT_ASSERT(reg_map[SLJIT_R0] < 8);
179 *inst++ = REX_W;
180 *inst++ = MOV_rm_i32;
181 *inst++ = MOD_REG | reg_lmap[SLJIT_R0];
182 sljit_unaligned_store_s32(inst, local_size);
183 #if (defined SLJIT_VERBOSE && SLJIT_VERBOSE) \
184 || (defined SLJIT_ARGUMENT_CHECKS && SLJIT_ARGUMENT_CHECKS)
185 compiler->skip_checks = 1;
186 #endif
187 FAIL_IF(sljit_emit_ijump(compiler, SLJIT_CALL1, SLJIT_IMM, SLJIT_FUNC_OFFSET(sljit_grow_stack)));
188 }
189 #endif
190
191 if (local_size > 0) {
192 if (local_size <= 127) {
193 inst = (sljit_u8*)ensure_buf(compiler, 1 + 4);
194 FAIL_IF(!inst);
195 INC_SIZE(4);
196 *inst++ = REX_W;
197 *inst++ = GROUP_BINARY_83;
198 *inst++ = MOD_REG | SUB | reg_map[SLJIT_SP];
199 *inst++ = local_size;
200 }
201 else {
202 inst = (sljit_u8*)ensure_buf(compiler, 1 + 7);
203 FAIL_IF(!inst);
204 INC_SIZE(7);
205 *inst++ = REX_W;
206 *inst++ = GROUP_BINARY_81;
207 *inst++ = MOD_REG | SUB | reg_map[SLJIT_SP];
208 sljit_unaligned_store_s32(inst, local_size);
209 inst += sizeof(sljit_s32);
210 }
211 }
212
213 #ifdef _WIN64
214 /* Save xmm6 register: movaps [rsp + 0x20], xmm6 */
215 if (fscratches >= 6 || fsaveds >= 1) {
216 inst = (sljit_u8*)ensure_buf(compiler, 1 + 5);
217 FAIL_IF(!inst);
218 INC_SIZE(5);
219 *inst++ = GROUP_0F;
220 sljit_unaligned_store_s32(inst, 0x20247429);
221 }
222 #endif
223
224 return SLJIT_SUCCESS;
225 }
226
sljit_set_context(struct sljit_compiler * compiler,sljit_s32 options,sljit_s32 args,sljit_s32 scratches,sljit_s32 saveds,sljit_s32 fscratches,sljit_s32 fsaveds,sljit_s32 local_size)227 SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_set_context(struct sljit_compiler *compiler,
228 sljit_s32 options, sljit_s32 args, sljit_s32 scratches, sljit_s32 saveds,
229 sljit_s32 fscratches, sljit_s32 fsaveds, sljit_s32 local_size)
230 {
231 sljit_s32 saved_register_size;
232
233 CHECK_ERROR();
234 CHECK(check_sljit_set_context(compiler, options, args, scratches, saveds, fscratches, fsaveds, local_size));
235 set_set_context(compiler, options, args, scratches, saveds, fscratches, fsaveds, local_size);
236
237 #ifdef _WIN64
238 /* Two/four register slots for parameters plus space for xmm6 register if needed. */
239 if (fscratches >= 6 || fsaveds >= 1)
240 compiler->locals_offset = 6 * sizeof(sljit_sw);
241 else
242 compiler->locals_offset = ((scratches > 2) ? 4 : 2) * sizeof(sljit_sw);
243 #endif
244
245 /* Including the return address saved by the call instruction. */
246 saved_register_size = GET_SAVED_REGISTERS_SIZE(scratches, saveds, 1);
247 compiler->local_size = ((local_size + SLJIT_LOCALS_OFFSET + saved_register_size + 15) & ~15) - saved_register_size;
248 return SLJIT_SUCCESS;
249 }
250
sljit_emit_return(struct sljit_compiler * compiler,sljit_s32 op,sljit_s32 src,sljit_sw srcw)251 SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_return(struct sljit_compiler *compiler, sljit_s32 op, sljit_s32 src, sljit_sw srcw)
252 {
253 sljit_s32 i, tmp, size;
254 sljit_u8 *inst;
255
256 CHECK_ERROR();
257 CHECK(check_sljit_emit_return(compiler, op, src, srcw));
258
259 FAIL_IF(emit_mov_before_return(compiler, op, src, srcw));
260
261 #ifdef _WIN64
262 /* Restore xmm6 register: movaps xmm6, [rsp + 0x20] */
263 if (compiler->fscratches >= 6 || compiler->fsaveds >= 1) {
264 inst = (sljit_u8*)ensure_buf(compiler, 1 + 5);
265 FAIL_IF(!inst);
266 INC_SIZE(5);
267 *inst++ = GROUP_0F;
268 sljit_unaligned_store_s32(inst, 0x20247428);
269 }
270 #endif
271
272 if (compiler->local_size > 0) {
273 if (compiler->local_size <= 127) {
274 inst = (sljit_u8*)ensure_buf(compiler, 1 + 4);
275 FAIL_IF(!inst);
276 INC_SIZE(4);
277 *inst++ = REX_W;
278 *inst++ = GROUP_BINARY_83;
279 *inst++ = MOD_REG | ADD | 4;
280 *inst = compiler->local_size;
281 }
282 else {
283 inst = (sljit_u8*)ensure_buf(compiler, 1 + 7);
284 FAIL_IF(!inst);
285 INC_SIZE(7);
286 *inst++ = REX_W;
287 *inst++ = GROUP_BINARY_81;
288 *inst++ = MOD_REG | ADD | 4;
289 sljit_unaligned_store_s32(inst, compiler->local_size);
290 }
291 }
292
293 tmp = compiler->scratches;
294 for (i = SLJIT_FIRST_SAVED_REG; i <= tmp; i++) {
295 size = reg_map[i] >= 8 ? 2 : 1;
296 inst = (sljit_u8*)ensure_buf(compiler, 1 + size);
297 FAIL_IF(!inst);
298 INC_SIZE(size);
299 if (reg_map[i] >= 8)
300 *inst++ = REX_B;
301 POP_REG(reg_lmap[i]);
302 }
303
304 tmp = compiler->saveds < SLJIT_NUMBER_OF_SAVED_REGISTERS ? (SLJIT_S0 + 1 - compiler->saveds) : SLJIT_FIRST_SAVED_REG;
305 for (i = tmp; i <= SLJIT_S0; i++) {
306 size = reg_map[i] >= 8 ? 2 : 1;
307 inst = (sljit_u8*)ensure_buf(compiler, 1 + size);
308 FAIL_IF(!inst);
309 INC_SIZE(size);
310 if (reg_map[i] >= 8)
311 *inst++ = REX_B;
312 POP_REG(reg_lmap[i]);
313 }
314
315 inst = (sljit_u8*)ensure_buf(compiler, 1 + 1);
316 FAIL_IF(!inst);
317 INC_SIZE(1);
318 RET();
319 return SLJIT_SUCCESS;
320 }
321
322 /* --------------------------------------------------------------------- */
323 /* Operators */
324 /* --------------------------------------------------------------------- */
325
emit_do_imm32(struct sljit_compiler * compiler,sljit_u8 rex,sljit_u8 opcode,sljit_sw imm)326 static sljit_s32 emit_do_imm32(struct sljit_compiler *compiler, sljit_u8 rex, sljit_u8 opcode, sljit_sw imm)
327 {
328 sljit_u8 *inst;
329 sljit_s32 length = 1 + (rex ? 1 : 0) + sizeof(sljit_s32);
330
331 inst = (sljit_u8*)ensure_buf(compiler, 1 + length);
332 FAIL_IF(!inst);
333 INC_SIZE(length);
334 if (rex)
335 *inst++ = rex;
336 *inst++ = opcode;
337 sljit_unaligned_store_s32(inst, imm);
338 return SLJIT_SUCCESS;
339 }
340
emit_x86_instruction(struct sljit_compiler * compiler,sljit_s32 size,sljit_s32 a,sljit_sw imma,sljit_s32 b,sljit_sw immb)341 static sljit_u8* emit_x86_instruction(struct sljit_compiler *compiler, sljit_s32 size,
342 /* The register or immediate operand. */
343 sljit_s32 a, sljit_sw imma,
344 /* The general operand (not immediate). */
345 sljit_s32 b, sljit_sw immb)
346 {
347 sljit_u8 *inst;
348 sljit_u8 *buf_ptr;
349 sljit_u8 rex = 0;
350 sljit_s32 flags = size & ~0xf;
351 sljit_s32 inst_size;
352
353 /* The immediate operand must be 32 bit. */
354 SLJIT_ASSERT(!(a & SLJIT_IMM) || compiler->mode32 || IS_HALFWORD(imma));
355 /* Both cannot be switched on. */
356 SLJIT_ASSERT((flags & (EX86_BIN_INS | EX86_SHIFT_INS)) != (EX86_BIN_INS | EX86_SHIFT_INS));
357 /* Size flags not allowed for typed instructions. */
358 SLJIT_ASSERT(!(flags & (EX86_BIN_INS | EX86_SHIFT_INS)) || (flags & (EX86_BYTE_ARG | EX86_HALF_ARG)) == 0);
359 /* Both size flags cannot be switched on. */
360 SLJIT_ASSERT((flags & (EX86_BYTE_ARG | EX86_HALF_ARG)) != (EX86_BYTE_ARG | EX86_HALF_ARG));
361 /* SSE2 and immediate is not possible. */
362 SLJIT_ASSERT(!(a & SLJIT_IMM) || !(flags & EX86_SSE2));
363 SLJIT_ASSERT((flags & (EX86_PREF_F2 | EX86_PREF_F3)) != (EX86_PREF_F2 | EX86_PREF_F3)
364 && (flags & (EX86_PREF_F2 | EX86_PREF_66)) != (EX86_PREF_F2 | EX86_PREF_66)
365 && (flags & (EX86_PREF_F3 | EX86_PREF_66)) != (EX86_PREF_F3 | EX86_PREF_66));
366
367 size &= 0xf;
368 inst_size = size;
369
370 if (!compiler->mode32 && !(flags & EX86_NO_REXW))
371 rex |= REX_W;
372 else if (flags & EX86_REX)
373 rex |= REX;
374
375 if (flags & (EX86_PREF_F2 | EX86_PREF_F3))
376 inst_size++;
377 if (flags & EX86_PREF_66)
378 inst_size++;
379
380 /* Calculate size of b. */
381 inst_size += 1; /* mod r/m byte. */
382 if (b & SLJIT_MEM) {
383 if (!(b & OFFS_REG_MASK)) {
384 if (NOT_HALFWORD(immb)) {
385 PTR_FAIL_IF(emit_load_imm64(compiler, TMP_REG3, immb));
386 immb = 0;
387 if (b & REG_MASK)
388 b |= TO_OFFS_REG(TMP_REG3);
389 else
390 b |= TMP_REG3;
391 }
392 else if (reg_lmap[b & REG_MASK] == 4)
393 b |= TO_OFFS_REG(SLJIT_SP);
394 }
395
396 if ((b & REG_MASK) == SLJIT_UNUSED)
397 inst_size += 1 + sizeof(sljit_s32); /* SIB byte required to avoid RIP based addressing. */
398 else {
399 if (reg_map[b & REG_MASK] >= 8)
400 rex |= REX_B;
401
402 if (immb != 0 && (!(b & OFFS_REG_MASK) || (b & OFFS_REG_MASK) == TO_OFFS_REG(SLJIT_SP))) {
403 /* Immediate operand. */
404 if (immb <= 127 && immb >= -128)
405 inst_size += sizeof(sljit_s8);
406 else
407 inst_size += sizeof(sljit_s32);
408 }
409 else if (reg_lmap[b & REG_MASK] == 5)
410 inst_size += sizeof(sljit_s8);
411
412 if ((b & OFFS_REG_MASK) != SLJIT_UNUSED) {
413 inst_size += 1; /* SIB byte. */
414 if (reg_map[OFFS_REG(b)] >= 8)
415 rex |= REX_X;
416 }
417 }
418 }
419 else if (!(flags & EX86_SSE2_OP2) && reg_map[b] >= 8)
420 rex |= REX_B;
421
422 if (a & SLJIT_IMM) {
423 if (flags & EX86_BIN_INS) {
424 if (imma <= 127 && imma >= -128) {
425 inst_size += 1;
426 flags |= EX86_BYTE_ARG;
427 } else
428 inst_size += 4;
429 }
430 else if (flags & EX86_SHIFT_INS) {
431 imma &= compiler->mode32 ? 0x1f : 0x3f;
432 if (imma != 1) {
433 inst_size ++;
434 flags |= EX86_BYTE_ARG;
435 }
436 } else if (flags & EX86_BYTE_ARG)
437 inst_size++;
438 else if (flags & EX86_HALF_ARG)
439 inst_size += sizeof(short);
440 else
441 inst_size += sizeof(sljit_s32);
442 }
443 else {
444 SLJIT_ASSERT(!(flags & EX86_SHIFT_INS) || a == SLJIT_PREF_SHIFT_REG);
445 /* reg_map[SLJIT_PREF_SHIFT_REG] is less than 8. */
446 if (!(flags & EX86_SSE2_OP1) && reg_map[a] >= 8)
447 rex |= REX_R;
448 }
449
450 if (rex)
451 inst_size++;
452
453 inst = (sljit_u8*)ensure_buf(compiler, 1 + inst_size);
454 PTR_FAIL_IF(!inst);
455
456 /* Encoding the byte. */
457 INC_SIZE(inst_size);
458 if (flags & EX86_PREF_F2)
459 *inst++ = 0xf2;
460 if (flags & EX86_PREF_F3)
461 *inst++ = 0xf3;
462 if (flags & EX86_PREF_66)
463 *inst++ = 0x66;
464 if (rex)
465 *inst++ = rex;
466 buf_ptr = inst + size;
467
468 /* Encode mod/rm byte. */
469 if (!(flags & EX86_SHIFT_INS)) {
470 if ((flags & EX86_BIN_INS) && (a & SLJIT_IMM))
471 *inst = (flags & EX86_BYTE_ARG) ? GROUP_BINARY_83 : GROUP_BINARY_81;
472
473 if ((a & SLJIT_IMM) || (a == 0))
474 *buf_ptr = 0;
475 else if (!(flags & EX86_SSE2_OP1))
476 *buf_ptr = reg_lmap[a] << 3;
477 else
478 *buf_ptr = a << 3;
479 }
480 else {
481 if (a & SLJIT_IMM) {
482 if (imma == 1)
483 *inst = GROUP_SHIFT_1;
484 else
485 *inst = GROUP_SHIFT_N;
486 } else
487 *inst = GROUP_SHIFT_CL;
488 *buf_ptr = 0;
489 }
490
491 if (!(b & SLJIT_MEM))
492 *buf_ptr++ |= MOD_REG + ((!(flags & EX86_SSE2_OP2)) ? reg_lmap[b] : b);
493 else if ((b & REG_MASK) != SLJIT_UNUSED) {
494 if ((b & OFFS_REG_MASK) == SLJIT_UNUSED || (b & OFFS_REG_MASK) == TO_OFFS_REG(SLJIT_SP)) {
495 if (immb != 0 || reg_lmap[b & REG_MASK] == 5) {
496 if (immb <= 127 && immb >= -128)
497 *buf_ptr |= 0x40;
498 else
499 *buf_ptr |= 0x80;
500 }
501
502 if ((b & OFFS_REG_MASK) == SLJIT_UNUSED)
503 *buf_ptr++ |= reg_lmap[b & REG_MASK];
504 else {
505 *buf_ptr++ |= 0x04;
506 *buf_ptr++ = reg_lmap[b & REG_MASK] | (reg_lmap[OFFS_REG(b)] << 3);
507 }
508
509 if (immb != 0 || reg_lmap[b & REG_MASK] == 5) {
510 if (immb <= 127 && immb >= -128)
511 *buf_ptr++ = immb; /* 8 bit displacement. */
512 else {
513 sljit_unaligned_store_s32(buf_ptr, immb); /* 32 bit displacement. */
514 buf_ptr += sizeof(sljit_s32);
515 }
516 }
517 }
518 else {
519 if (reg_lmap[b & REG_MASK] == 5)
520 *buf_ptr |= 0x40;
521 *buf_ptr++ |= 0x04;
522 *buf_ptr++ = reg_lmap[b & REG_MASK] | (reg_lmap[OFFS_REG(b)] << 3) | (immb << 6);
523 if (reg_lmap[b & REG_MASK] == 5)
524 *buf_ptr++ = 0;
525 }
526 }
527 else {
528 *buf_ptr++ |= 0x04;
529 *buf_ptr++ = 0x25;
530 sljit_unaligned_store_s32(buf_ptr, immb); /* 32 bit displacement. */
531 buf_ptr += sizeof(sljit_s32);
532 }
533
534 if (a & SLJIT_IMM) {
535 if (flags & EX86_BYTE_ARG)
536 *buf_ptr = imma;
537 else if (flags & EX86_HALF_ARG)
538 sljit_unaligned_store_s16(buf_ptr, imma);
539 else if (!(flags & EX86_SHIFT_INS))
540 sljit_unaligned_store_s32(buf_ptr, imma);
541 }
542
543 return !(flags & EX86_SHIFT_INS) ? inst : (inst + 1);
544 }
545
546 /* --------------------------------------------------------------------- */
547 /* Call / return instructions */
548 /* --------------------------------------------------------------------- */
549
call_with_args(struct sljit_compiler * compiler,sljit_s32 type)550 static SLJIT_INLINE sljit_s32 call_with_args(struct sljit_compiler *compiler, sljit_s32 type)
551 {
552 sljit_u8 *inst;
553
554 #ifndef _WIN64
555 SLJIT_ASSERT(reg_map[SLJIT_R1] == 6 && reg_map[SLJIT_R0] < 8 && reg_map[SLJIT_R2] < 8);
556
557 inst = (sljit_u8*)ensure_buf(compiler, 1 + ((type < SLJIT_CALL3) ? 3 : 6));
558 FAIL_IF(!inst);
559 INC_SIZE((type < SLJIT_CALL3) ? 3 : 6);
560 if (type >= SLJIT_CALL3) {
561 *inst++ = REX_W;
562 *inst++ = MOV_r_rm;
563 *inst++ = MOD_REG | (0x2 /* rdx */ << 3) | reg_lmap[SLJIT_R2];
564 }
565 *inst++ = REX_W;
566 *inst++ = MOV_r_rm;
567 *inst++ = MOD_REG | (0x7 /* rdi */ << 3) | reg_lmap[SLJIT_R0];
568 #else
569 SLJIT_ASSERT(reg_map[SLJIT_R1] == 2 && reg_map[SLJIT_R0] < 8 && reg_map[SLJIT_R2] < 8);
570
571 inst = (sljit_u8*)ensure_buf(compiler, 1 + ((type < SLJIT_CALL3) ? 3 : 6));
572 FAIL_IF(!inst);
573 INC_SIZE((type < SLJIT_CALL3) ? 3 : 6);
574 if (type >= SLJIT_CALL3) {
575 *inst++ = REX_W | REX_R;
576 *inst++ = MOV_r_rm;
577 *inst++ = MOD_REG | (0x0 /* r8 */ << 3) | reg_lmap[SLJIT_R2];
578 }
579 *inst++ = REX_W;
580 *inst++ = MOV_r_rm;
581 *inst++ = MOD_REG | (0x1 /* rcx */ << 3) | reg_lmap[SLJIT_R0];
582 #endif
583 return SLJIT_SUCCESS;
584 }
585
sljit_emit_fast_enter(struct sljit_compiler * compiler,sljit_s32 dst,sljit_sw dstw)586 SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_fast_enter(struct sljit_compiler *compiler, sljit_s32 dst, sljit_sw dstw)
587 {
588 sljit_u8 *inst;
589
590 CHECK_ERROR();
591 CHECK(check_sljit_emit_fast_enter(compiler, dst, dstw));
592 ADJUST_LOCAL_OFFSET(dst, dstw);
593
594 /* For UNUSED dst. Uncommon, but possible. */
595 if (dst == SLJIT_UNUSED)
596 dst = TMP_REG1;
597
598 if (FAST_IS_REG(dst)) {
599 if (reg_map[dst] < 8) {
600 inst = (sljit_u8*)ensure_buf(compiler, 1 + 1);
601 FAIL_IF(!inst);
602 INC_SIZE(1);
603 POP_REG(reg_lmap[dst]);
604 return SLJIT_SUCCESS;
605 }
606
607 inst = (sljit_u8*)ensure_buf(compiler, 1 + 2);
608 FAIL_IF(!inst);
609 INC_SIZE(2);
610 *inst++ = REX_B;
611 POP_REG(reg_lmap[dst]);
612 return SLJIT_SUCCESS;
613 }
614
615 /* REX_W is not necessary (src is not immediate). */
616 compiler->mode32 = 1;
617 inst = emit_x86_instruction(compiler, 1, 0, 0, dst, dstw);
618 FAIL_IF(!inst);
619 *inst++ = POP_rm;
620 return SLJIT_SUCCESS;
621 }
622
sljit_emit_fast_return(struct sljit_compiler * compiler,sljit_s32 src,sljit_sw srcw)623 SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_fast_return(struct sljit_compiler *compiler, sljit_s32 src, sljit_sw srcw)
624 {
625 sljit_u8 *inst;
626
627 CHECK_ERROR();
628 CHECK(check_sljit_emit_fast_return(compiler, src, srcw));
629 ADJUST_LOCAL_OFFSET(src, srcw);
630
631 if ((src & SLJIT_IMM) && NOT_HALFWORD(srcw)) {
632 FAIL_IF(emit_load_imm64(compiler, TMP_REG1, srcw));
633 src = TMP_REG1;
634 }
635
636 if (FAST_IS_REG(src)) {
637 if (reg_map[src] < 8) {
638 inst = (sljit_u8*)ensure_buf(compiler, 1 + 1 + 1);
639 FAIL_IF(!inst);
640
641 INC_SIZE(1 + 1);
642 PUSH_REG(reg_lmap[src]);
643 }
644 else {
645 inst = (sljit_u8*)ensure_buf(compiler, 1 + 2 + 1);
646 FAIL_IF(!inst);
647
648 INC_SIZE(2 + 1);
649 *inst++ = REX_B;
650 PUSH_REG(reg_lmap[src]);
651 }
652 }
653 else if (src & SLJIT_MEM) {
654 /* REX_W is not necessary (src is not immediate). */
655 compiler->mode32 = 1;
656 inst = emit_x86_instruction(compiler, 1, 0, 0, src, srcw);
657 FAIL_IF(!inst);
658 *inst++ = GROUP_FF;
659 *inst |= PUSH_rm;
660
661 inst = (sljit_u8*)ensure_buf(compiler, 1 + 1);
662 FAIL_IF(!inst);
663 INC_SIZE(1);
664 }
665 else {
666 SLJIT_ASSERT(IS_HALFWORD(srcw));
667 /* SLJIT_IMM. */
668 inst = (sljit_u8*)ensure_buf(compiler, 1 + 5 + 1);
669 FAIL_IF(!inst);
670
671 INC_SIZE(5 + 1);
672 *inst++ = PUSH_i32;
673 sljit_unaligned_store_s32(inst, srcw);
674 inst += sizeof(sljit_s32);
675 }
676
677 RET();
678 return SLJIT_SUCCESS;
679 }
680
681
682 /* --------------------------------------------------------------------- */
683 /* Extend input */
684 /* --------------------------------------------------------------------- */
685
emit_mov_int(struct sljit_compiler * compiler,sljit_s32 sign,sljit_s32 dst,sljit_sw dstw,sljit_s32 src,sljit_sw srcw)686 static sljit_s32 emit_mov_int(struct sljit_compiler *compiler, sljit_s32 sign,
687 sljit_s32 dst, sljit_sw dstw,
688 sljit_s32 src, sljit_sw srcw)
689 {
690 sljit_u8* inst;
691 sljit_s32 dst_r;
692
693 compiler->mode32 = 0;
694
695 if (dst == SLJIT_UNUSED && !(src & SLJIT_MEM))
696 return SLJIT_SUCCESS; /* Empty instruction. */
697
698 if (src & SLJIT_IMM) {
699 if (FAST_IS_REG(dst)) {
700 if (sign || ((sljit_uw)srcw <= 0x7fffffff)) {
701 inst = emit_x86_instruction(compiler, 1, SLJIT_IMM, (sljit_sw)(sljit_s32)srcw, dst, dstw);
702 FAIL_IF(!inst);
703 *inst = MOV_rm_i32;
704 return SLJIT_SUCCESS;
705 }
706 return emit_load_imm64(compiler, dst, srcw);
707 }
708 compiler->mode32 = 1;
709 inst = emit_x86_instruction(compiler, 1, SLJIT_IMM, (sljit_sw)(sljit_s32)srcw, dst, dstw);
710 FAIL_IF(!inst);
711 *inst = MOV_rm_i32;
712 compiler->mode32 = 0;
713 return SLJIT_SUCCESS;
714 }
715
716 dst_r = FAST_IS_REG(dst) ? dst : TMP_REG1;
717
718 if ((dst & SLJIT_MEM) && FAST_IS_REG(src))
719 dst_r = src;
720 else {
721 if (sign) {
722 inst = emit_x86_instruction(compiler, 1, dst_r, 0, src, srcw);
723 FAIL_IF(!inst);
724 *inst++ = MOVSXD_r_rm;
725 } else {
726 compiler->mode32 = 1;
727 FAIL_IF(emit_mov(compiler, dst_r, 0, src, srcw));
728 compiler->mode32 = 0;
729 }
730 }
731
732 if (dst & SLJIT_MEM) {
733 compiler->mode32 = 1;
734 inst = emit_x86_instruction(compiler, 1, dst_r, 0, dst, dstw);
735 FAIL_IF(!inst);
736 *inst = MOV_rm_r;
737 compiler->mode32 = 0;
738 }
739
740 return SLJIT_SUCCESS;
741 }
742