1 /*
2 * Stack-less Just-In-Time compiler
3 *
4 * Copyright 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 32-bit arch dependent functions. */
28
emit_do_imm(struct sljit_compiler * compiler,sljit_u8 opcode,sljit_sw imm)29 static sljit_s32 emit_do_imm(struct sljit_compiler *compiler, sljit_u8 opcode, sljit_sw imm)
30 {
31 sljit_u8 *inst;
32
33 inst = (sljit_u8*)ensure_buf(compiler, 1 + 1 + sizeof(sljit_sw));
34 FAIL_IF(!inst);
35 INC_SIZE(1 + sizeof(sljit_sw));
36 *inst++ = opcode;
37 sljit_unaligned_store_sw(inst, imm);
38 return SLJIT_SUCCESS;
39 }
40
generate_far_jump_code(struct sljit_jump * jump,sljit_u8 * code_ptr,sljit_s32 type,sljit_sw executable_offset)41 static sljit_u8* generate_far_jump_code(struct sljit_jump *jump, sljit_u8 *code_ptr, sljit_s32 type, sljit_sw executable_offset)
42 {
43 if (type == SLJIT_JUMP) {
44 *code_ptr++ = JMP_i32;
45 jump->addr++;
46 }
47 else if (type >= SLJIT_FAST_CALL) {
48 *code_ptr++ = CALL_i32;
49 jump->addr++;
50 }
51 else {
52 *code_ptr++ = GROUP_0F;
53 *code_ptr++ = get_jump_code(type);
54 jump->addr += 2;
55 }
56
57 if (jump->flags & JUMP_LABEL)
58 jump->flags |= PATCH_MW;
59 else
60 sljit_unaligned_store_sw(code_ptr, jump->u.target - (jump->addr + 4) - (sljit_uw)executable_offset);
61 code_ptr += 4;
62
63 return code_ptr;
64 }
65
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)66 SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_enter(struct sljit_compiler *compiler,
67 sljit_s32 options, sljit_s32 args, sljit_s32 scratches, sljit_s32 saveds,
68 sljit_s32 fscratches, sljit_s32 fsaveds, sljit_s32 local_size)
69 {
70 sljit_s32 size;
71 sljit_u8 *inst;
72
73 CHECK_ERROR();
74 CHECK(check_sljit_emit_enter(compiler, options, args, scratches, saveds, fscratches, fsaveds, local_size));
75 set_emit_enter(compiler, options, args, scratches, saveds, fscratches, fsaveds, local_size);
76
77 compiler->args = args;
78
79 #if (defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL)
80 /* [esp+0] for saving temporaries and third argument for calls. */
81 compiler->saveds_offset = 1 * sizeof(sljit_sw);
82 #else
83 /* [esp+0] for saving temporaries and space for maximum three arguments. */
84 if (scratches <= 1)
85 compiler->saveds_offset = 1 * sizeof(sljit_sw);
86 else
87 compiler->saveds_offset = ((scratches == 2) ? 2 : 3) * sizeof(sljit_sw);
88 #endif
89
90 if (scratches > 3)
91 compiler->saveds_offset += ((scratches > (3 + 6)) ? 6 : (scratches - 3)) * sizeof(sljit_sw);
92
93 compiler->locals_offset = compiler->saveds_offset;
94
95 if (saveds > 3)
96 compiler->locals_offset += (saveds - 3) * sizeof(sljit_sw);
97
98 if (options & SLJIT_F64_ALIGNMENT)
99 compiler->locals_offset = (compiler->locals_offset + sizeof(sljit_f64) - 1) & ~(sizeof(sljit_f64) - 1);
100
101 size = 1 + (scratches > 9 ? (scratches - 9) : 0) + (saveds <= 3 ? saveds : 3);
102 #if (defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL)
103 size += (args > 0 ? (args * 2) : 0) + (args > 2 ? 2 : 0);
104 #else
105 size += (args > 0 ? (2 + args * 3) : 0);
106 #endif
107 inst = (sljit_u8*)ensure_buf(compiler, 1 + size);
108 FAIL_IF(!inst);
109
110 INC_SIZE(size);
111 PUSH_REG(reg_map[TMP_REG1]);
112 #if !(defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL)
113 if (args > 0) {
114 *inst++ = MOV_r_rm;
115 *inst++ = MOD_REG | (reg_map[TMP_REG1] << 3) | 0x4 /* esp */;
116 }
117 #endif
118 if (saveds > 2 || scratches > 9)
119 PUSH_REG(reg_map[SLJIT_S2]);
120 if (saveds > 1 || scratches > 10)
121 PUSH_REG(reg_map[SLJIT_S1]);
122 if (saveds > 0 || scratches > 11)
123 PUSH_REG(reg_map[SLJIT_S0]);
124
125 #if (defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL)
126 if (args > 0) {
127 *inst++ = MOV_r_rm;
128 *inst++ = MOD_REG | (reg_map[SLJIT_S0] << 3) | reg_map[SLJIT_R2];
129 }
130 if (args > 1) {
131 *inst++ = MOV_r_rm;
132 *inst++ = MOD_REG | (reg_map[SLJIT_S1] << 3) | reg_map[SLJIT_R1];
133 }
134 if (args > 2) {
135 *inst++ = MOV_r_rm;
136 *inst++ = MOD_DISP8 | (reg_map[SLJIT_S2] << 3) | 0x4 /* esp */;
137 *inst++ = 0x24;
138 *inst++ = sizeof(sljit_sw) * (3 + 2); /* saveds >= 3 as well. */
139 }
140 #else
141 if (args > 0) {
142 *inst++ = MOV_r_rm;
143 *inst++ = MOD_DISP8 | (reg_map[SLJIT_S0] << 3) | reg_map[TMP_REG1];
144 *inst++ = sizeof(sljit_sw) * 2;
145 }
146 if (args > 1) {
147 *inst++ = MOV_r_rm;
148 *inst++ = MOD_DISP8 | (reg_map[SLJIT_S1] << 3) | reg_map[TMP_REG1];
149 *inst++ = sizeof(sljit_sw) * 3;
150 }
151 if (args > 2) {
152 *inst++ = MOV_r_rm;
153 *inst++ = MOD_DISP8 | (reg_map[SLJIT_S2] << 3) | reg_map[TMP_REG1];
154 *inst++ = sizeof(sljit_sw) * 4;
155 }
156 #endif
157
158 SLJIT_ASSERT(SLJIT_LOCALS_OFFSET > 0);
159
160 #if defined(__APPLE__)
161 /* Ignore pushed registers and SLJIT_LOCALS_OFFSET when computing the aligned local size. */
162 saveds = (2 + (scratches > 9 ? (scratches - 9) : 0) + (saveds <= 3 ? saveds : 3)) * sizeof(sljit_uw);
163 local_size = ((SLJIT_LOCALS_OFFSET + saveds + local_size + 15) & ~15) - saveds;
164 #else
165 if (options & SLJIT_F64_ALIGNMENT)
166 local_size = SLJIT_LOCALS_OFFSET + ((local_size + sizeof(sljit_f64) - 1) & ~(sizeof(sljit_f64) - 1));
167 else
168 local_size = SLJIT_LOCALS_OFFSET + ((local_size + sizeof(sljit_sw) - 1) & ~(sizeof(sljit_sw) - 1));
169 #endif
170
171 compiler->local_size = local_size;
172
173 #ifdef _WIN32
174 if (local_size > 1024) {
175 #if (defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL)
176 FAIL_IF(emit_do_imm(compiler, MOV_r_i32 + reg_map[SLJIT_R0], local_size));
177 #else
178 /* Space for a single argument. This amount is excluded when the stack is allocated below. */
179 local_size -= sizeof(sljit_sw);
180 FAIL_IF(emit_do_imm(compiler, MOV_r_i32 + reg_map[SLJIT_R0], local_size));
181 FAIL_IF(emit_non_cum_binary(compiler, SUB_r_rm, SUB_rm_r, SUB, SUB_EAX_i32,
182 SLJIT_SP, 0, SLJIT_SP, 0, SLJIT_IMM, sizeof(sljit_sw)));
183 #endif
184 FAIL_IF(sljit_emit_ijump(compiler, SLJIT_CALL1, SLJIT_IMM, SLJIT_FUNC_OFFSET(sljit_grow_stack)));
185 }
186 #endif
187
188 SLJIT_ASSERT(local_size > 0);
189
190 #if !defined(__APPLE__)
191 if (options & SLJIT_F64_ALIGNMENT) {
192 EMIT_MOV(compiler, TMP_REG1, 0, SLJIT_SP, 0);
193
194 /* Some space might allocated during sljit_grow_stack() above on WIN32. */
195 FAIL_IF(emit_non_cum_binary(compiler, SUB_r_rm, SUB_rm_r, SUB, SUB_EAX_i32,
196 SLJIT_SP, 0, SLJIT_SP, 0, SLJIT_IMM, local_size + sizeof(sljit_sw)));
197
198 #if defined _WIN32 && !(defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL)
199 if (compiler->local_size > 1024)
200 FAIL_IF(emit_cum_binary(compiler, ADD_r_rm, ADD_rm_r, ADD, ADD_EAX_i32,
201 TMP_REG1, 0, TMP_REG1, 0, SLJIT_IMM, sizeof(sljit_sw)));
202 #endif
203
204 inst = (sljit_u8*)ensure_buf(compiler, 1 + 6);
205 FAIL_IF(!inst);
206
207 INC_SIZE(6);
208 inst[0] = GROUP_BINARY_81;
209 inst[1] = MOD_REG | AND | reg_map[SLJIT_SP];
210 sljit_unaligned_store_sw(inst + 2, ~(sizeof(sljit_f64) - 1));
211
212 /* The real local size must be used. */
213 return emit_mov(compiler, SLJIT_MEM1(SLJIT_SP), compiler->local_size, TMP_REG1, 0);
214 }
215 #endif
216 return emit_non_cum_binary(compiler, SUB_r_rm, SUB_rm_r, SUB, SUB_EAX_i32,
217 SLJIT_SP, 0, SLJIT_SP, 0, SLJIT_IMM, local_size);
218 }
219
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)220 SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_set_context(struct sljit_compiler *compiler,
221 sljit_s32 options, sljit_s32 args, sljit_s32 scratches, sljit_s32 saveds,
222 sljit_s32 fscratches, sljit_s32 fsaveds, sljit_s32 local_size)
223 {
224 CHECK_ERROR();
225 CHECK(check_sljit_set_context(compiler, options, args, scratches, saveds, fscratches, fsaveds, local_size));
226 set_set_context(compiler, options, args, scratches, saveds, fscratches, fsaveds, local_size);
227
228 compiler->args = args;
229
230 #if (defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL)
231 /* [esp+0] for saving temporaries and third argument for calls. */
232 compiler->saveds_offset = 1 * sizeof(sljit_sw);
233 #else
234 /* [esp+0] for saving temporaries and space for maximum three arguments. */
235 if (scratches <= 1)
236 compiler->saveds_offset = 1 * sizeof(sljit_sw);
237 else
238 compiler->saveds_offset = ((scratches == 2) ? 2 : 3) * sizeof(sljit_sw);
239 #endif
240
241 if (scratches > 3)
242 compiler->saveds_offset += ((scratches > (3 + 6)) ? 6 : (scratches - 3)) * sizeof(sljit_sw);
243
244 compiler->locals_offset = compiler->saveds_offset;
245
246 if (saveds > 3)
247 compiler->locals_offset += (saveds - 3) * sizeof(sljit_sw);
248
249 if (options & SLJIT_F64_ALIGNMENT)
250 compiler->locals_offset = (compiler->locals_offset + sizeof(sljit_f64) - 1) & ~(sizeof(sljit_f64) - 1);
251
252 #if defined(__APPLE__)
253 saveds = (2 + (scratches > 9 ? (scratches - 9) : 0) + (saveds <= 3 ? saveds : 3)) * sizeof(sljit_uw);
254 compiler->local_size = ((SLJIT_LOCALS_OFFSET + saveds + local_size + 15) & ~15) - saveds;
255 #else
256 if (options & SLJIT_F64_ALIGNMENT)
257 compiler->local_size = SLJIT_LOCALS_OFFSET + ((local_size + sizeof(sljit_f64) - 1) & ~(sizeof(sljit_f64) - 1));
258 else
259 compiler->local_size = SLJIT_LOCALS_OFFSET + ((local_size + sizeof(sljit_sw) - 1) & ~(sizeof(sljit_sw) - 1));
260 #endif
261 return SLJIT_SUCCESS;
262 }
263
sljit_emit_return(struct sljit_compiler * compiler,sljit_s32 op,sljit_s32 src,sljit_sw srcw)264 SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_return(struct sljit_compiler *compiler, sljit_s32 op, sljit_s32 src, sljit_sw srcw)
265 {
266 sljit_s32 size;
267 sljit_u8 *inst;
268
269 CHECK_ERROR();
270 CHECK(check_sljit_emit_return(compiler, op, src, srcw));
271 SLJIT_ASSERT(compiler->args >= 0);
272
273 FAIL_IF(emit_mov_before_return(compiler, op, src, srcw));
274
275 SLJIT_ASSERT(compiler->local_size > 0);
276
277 #if !defined(__APPLE__)
278 if (compiler->options & SLJIT_F64_ALIGNMENT)
279 EMIT_MOV(compiler, SLJIT_SP, 0, SLJIT_MEM1(SLJIT_SP), compiler->local_size)
280 else
281 FAIL_IF(emit_cum_binary(compiler, ADD_r_rm, ADD_rm_r, ADD, ADD_EAX_i32,
282 SLJIT_SP, 0, SLJIT_SP, 0, SLJIT_IMM, compiler->local_size));
283 #else
284 FAIL_IF(emit_cum_binary(compiler, ADD_r_rm, ADD_rm_r, ADD, ADD_EAX_i32,
285 SLJIT_SP, 0, SLJIT_SP, 0, SLJIT_IMM, compiler->local_size));
286 #endif
287
288 size = 2 + (compiler->scratches > 7 ? (compiler->scratches - 7) : 0) +
289 (compiler->saveds <= 3 ? compiler->saveds : 3);
290 #if (defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL)
291 if (compiler->args > 2)
292 size += 2;
293 #else
294 if (compiler->args > 0)
295 size += 2;
296 #endif
297 inst = (sljit_u8*)ensure_buf(compiler, 1 + size);
298 FAIL_IF(!inst);
299
300 INC_SIZE(size);
301
302 if (compiler->saveds > 0 || compiler->scratches > 11)
303 POP_REG(reg_map[SLJIT_S0]);
304 if (compiler->saveds > 1 || compiler->scratches > 10)
305 POP_REG(reg_map[SLJIT_S1]);
306 if (compiler->saveds > 2 || compiler->scratches > 9)
307 POP_REG(reg_map[SLJIT_S2]);
308 POP_REG(reg_map[TMP_REG1]);
309 #if (defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL)
310 if (compiler->args > 2)
311 RET_I16(sizeof(sljit_sw));
312 else
313 RET();
314 #else
315 RET();
316 #endif
317
318 return SLJIT_SUCCESS;
319 }
320
321 /* --------------------------------------------------------------------- */
322 /* Operators */
323 /* --------------------------------------------------------------------- */
324
325 /* Size contains the flags as well. */
emit_x86_instruction(struct sljit_compiler * compiler,sljit_s32 size,sljit_s32 a,sljit_sw imma,sljit_s32 b,sljit_sw immb)326 static sljit_u8* emit_x86_instruction(struct sljit_compiler *compiler, sljit_s32 size,
327 /* The register or immediate operand. */
328 sljit_s32 a, sljit_sw imma,
329 /* The general operand (not immediate). */
330 sljit_s32 b, sljit_sw immb)
331 {
332 sljit_u8 *inst;
333 sljit_u8 *buf_ptr;
334 sljit_s32 flags = size & ~0xf;
335 sljit_s32 inst_size;
336
337 /* Both cannot be switched on. */
338 SLJIT_ASSERT((flags & (EX86_BIN_INS | EX86_SHIFT_INS)) != (EX86_BIN_INS | EX86_SHIFT_INS));
339 /* Size flags not allowed for typed instructions. */
340 SLJIT_ASSERT(!(flags & (EX86_BIN_INS | EX86_SHIFT_INS)) || (flags & (EX86_BYTE_ARG | EX86_HALF_ARG)) == 0);
341 /* Both size flags cannot be switched on. */
342 SLJIT_ASSERT((flags & (EX86_BYTE_ARG | EX86_HALF_ARG)) != (EX86_BYTE_ARG | EX86_HALF_ARG));
343 /* SSE2 and immediate is not possible. */
344 SLJIT_ASSERT(!(a & SLJIT_IMM) || !(flags & EX86_SSE2));
345 SLJIT_ASSERT((flags & (EX86_PREF_F2 | EX86_PREF_F3)) != (EX86_PREF_F2 | EX86_PREF_F3)
346 && (flags & (EX86_PREF_F2 | EX86_PREF_66)) != (EX86_PREF_F2 | EX86_PREF_66)
347 && (flags & (EX86_PREF_F3 | EX86_PREF_66)) != (EX86_PREF_F3 | EX86_PREF_66));
348
349 size &= 0xf;
350 inst_size = size;
351
352 if (flags & (EX86_PREF_F2 | EX86_PREF_F3))
353 inst_size++;
354 if (flags & EX86_PREF_66)
355 inst_size++;
356
357 /* Calculate size of b. */
358 inst_size += 1; /* mod r/m byte. */
359 if (b & SLJIT_MEM) {
360 if ((b & REG_MASK) == SLJIT_UNUSED)
361 inst_size += sizeof(sljit_sw);
362 else if (immb != 0 && !(b & OFFS_REG_MASK)) {
363 /* Immediate operand. */
364 if (immb <= 127 && immb >= -128)
365 inst_size += sizeof(sljit_s8);
366 else
367 inst_size += sizeof(sljit_sw);
368 }
369
370 if ((b & REG_MASK) == SLJIT_SP && !(b & OFFS_REG_MASK))
371 b |= TO_OFFS_REG(SLJIT_SP);
372
373 if ((b & OFFS_REG_MASK) != SLJIT_UNUSED)
374 inst_size += 1; /* SIB byte. */
375 }
376
377 /* Calculate size of a. */
378 if (a & SLJIT_IMM) {
379 if (flags & EX86_BIN_INS) {
380 if (imma <= 127 && imma >= -128) {
381 inst_size += 1;
382 flags |= EX86_BYTE_ARG;
383 } else
384 inst_size += 4;
385 }
386 else if (flags & EX86_SHIFT_INS) {
387 imma &= 0x1f;
388 if (imma != 1) {
389 inst_size ++;
390 flags |= EX86_BYTE_ARG;
391 }
392 } else if (flags & EX86_BYTE_ARG)
393 inst_size++;
394 else if (flags & EX86_HALF_ARG)
395 inst_size += sizeof(short);
396 else
397 inst_size += sizeof(sljit_sw);
398 }
399 else
400 SLJIT_ASSERT(!(flags & EX86_SHIFT_INS) || a == SLJIT_PREF_SHIFT_REG);
401
402 inst = (sljit_u8*)ensure_buf(compiler, 1 + inst_size);
403 PTR_FAIL_IF(!inst);
404
405 /* Encoding the byte. */
406 INC_SIZE(inst_size);
407 if (flags & EX86_PREF_F2)
408 *inst++ = 0xf2;
409 if (flags & EX86_PREF_F3)
410 *inst++ = 0xf3;
411 if (flags & EX86_PREF_66)
412 *inst++ = 0x66;
413
414 buf_ptr = inst + size;
415
416 /* Encode mod/rm byte. */
417 if (!(flags & EX86_SHIFT_INS)) {
418 if ((flags & EX86_BIN_INS) && (a & SLJIT_IMM))
419 *inst = (flags & EX86_BYTE_ARG) ? GROUP_BINARY_83 : GROUP_BINARY_81;
420
421 if ((a & SLJIT_IMM) || (a == 0))
422 *buf_ptr = 0;
423 else if (!(flags & EX86_SSE2_OP1))
424 *buf_ptr = reg_map[a] << 3;
425 else
426 *buf_ptr = a << 3;
427 }
428 else {
429 if (a & SLJIT_IMM) {
430 if (imma == 1)
431 *inst = GROUP_SHIFT_1;
432 else
433 *inst = GROUP_SHIFT_N;
434 } else
435 *inst = GROUP_SHIFT_CL;
436 *buf_ptr = 0;
437 }
438
439 if (!(b & SLJIT_MEM))
440 *buf_ptr++ |= MOD_REG + ((!(flags & EX86_SSE2_OP2)) ? reg_map[b] : b);
441 else if ((b & REG_MASK) != SLJIT_UNUSED) {
442 if ((b & OFFS_REG_MASK) == SLJIT_UNUSED || (b & OFFS_REG_MASK) == TO_OFFS_REG(SLJIT_SP)) {
443 if (immb != 0) {
444 if (immb <= 127 && immb >= -128)
445 *buf_ptr |= 0x40;
446 else
447 *buf_ptr |= 0x80;
448 }
449
450 if ((b & OFFS_REG_MASK) == SLJIT_UNUSED)
451 *buf_ptr++ |= reg_map[b & REG_MASK];
452 else {
453 *buf_ptr++ |= 0x04;
454 *buf_ptr++ = reg_map[b & REG_MASK] | (reg_map[OFFS_REG(b)] << 3);
455 }
456
457 if (immb != 0) {
458 if (immb <= 127 && immb >= -128)
459 *buf_ptr++ = immb; /* 8 bit displacement. */
460 else {
461 sljit_unaligned_store_sw(buf_ptr, immb); /* 32 bit displacement. */
462 buf_ptr += sizeof(sljit_sw);
463 }
464 }
465 }
466 else {
467 *buf_ptr++ |= 0x04;
468 *buf_ptr++ = reg_map[b & REG_MASK] | (reg_map[OFFS_REG(b)] << 3) | (immb << 6);
469 }
470 }
471 else {
472 *buf_ptr++ |= 0x05;
473 sljit_unaligned_store_sw(buf_ptr, immb); /* 32 bit displacement. */
474 buf_ptr += sizeof(sljit_sw);
475 }
476
477 if (a & SLJIT_IMM) {
478 if (flags & EX86_BYTE_ARG)
479 *buf_ptr = imma;
480 else if (flags & EX86_HALF_ARG)
481 sljit_unaligned_store_s16(buf_ptr, imma);
482 else if (!(flags & EX86_SHIFT_INS))
483 sljit_unaligned_store_sw(buf_ptr, imma);
484 }
485
486 return !(flags & EX86_SHIFT_INS) ? inst : (inst + 1);
487 }
488
489 /* --------------------------------------------------------------------- */
490 /* Call / return instructions */
491 /* --------------------------------------------------------------------- */
492
call_with_args(struct sljit_compiler * compiler,sljit_s32 type)493 static SLJIT_INLINE sljit_s32 call_with_args(struct sljit_compiler *compiler, sljit_s32 type)
494 {
495 sljit_u8 *inst;
496
497 #if (defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL)
498 inst = (sljit_u8*)ensure_buf(compiler, type >= SLJIT_CALL3 ? 1 + 2 + 1 : 1 + 2);
499 FAIL_IF(!inst);
500 INC_SIZE(type >= SLJIT_CALL3 ? 2 + 1 : 2);
501
502 if (type >= SLJIT_CALL3)
503 PUSH_REG(reg_map[SLJIT_R2]);
504 *inst++ = MOV_r_rm;
505 *inst++ = MOD_REG | (reg_map[SLJIT_R2] << 3) | reg_map[SLJIT_R0];
506 #else
507 inst = (sljit_u8*)ensure_buf(compiler, 1 + 4 * (type - SLJIT_CALL0));
508 FAIL_IF(!inst);
509 INC_SIZE(4 * (type - SLJIT_CALL0));
510
511 *inst++ = MOV_rm_r;
512 *inst++ = MOD_DISP8 | (reg_map[SLJIT_R0] << 3) | 0x4 /* SIB */;
513 *inst++ = (0x4 /* none*/ << 3) | reg_map[SLJIT_SP];
514 *inst++ = 0;
515 if (type >= SLJIT_CALL2) {
516 *inst++ = MOV_rm_r;
517 *inst++ = MOD_DISP8 | (reg_map[SLJIT_R1] << 3) | 0x4 /* SIB */;
518 *inst++ = (0x4 /* none*/ << 3) | reg_map[SLJIT_SP];
519 *inst++ = sizeof(sljit_sw);
520 }
521 if (type >= SLJIT_CALL3) {
522 *inst++ = MOV_rm_r;
523 *inst++ = MOD_DISP8 | (reg_map[SLJIT_R2] << 3) | 0x4 /* SIB */;
524 *inst++ = (0x4 /* none*/ << 3) | reg_map[SLJIT_SP];
525 *inst++ = 2 * sizeof(sljit_sw);
526 }
527 #endif
528 return SLJIT_SUCCESS;
529 }
530
sljit_emit_fast_enter(struct sljit_compiler * compiler,sljit_s32 dst,sljit_sw dstw)531 SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_fast_enter(struct sljit_compiler *compiler, sljit_s32 dst, sljit_sw dstw)
532 {
533 sljit_u8 *inst;
534
535 CHECK_ERROR();
536 CHECK(check_sljit_emit_fast_enter(compiler, dst, dstw));
537 ADJUST_LOCAL_OFFSET(dst, dstw);
538
539 CHECK_EXTRA_REGS(dst, dstw, (void)0);
540
541 /* For UNUSED dst. Uncommon, but possible. */
542 if (dst == SLJIT_UNUSED)
543 dst = TMP_REG1;
544
545 if (FAST_IS_REG(dst)) {
546 /* Unused dest is possible here. */
547 inst = (sljit_u8*)ensure_buf(compiler, 1 + 1);
548 FAIL_IF(!inst);
549
550 INC_SIZE(1);
551 POP_REG(reg_map[dst]);
552 return SLJIT_SUCCESS;
553 }
554
555 /* Memory. */
556 inst = emit_x86_instruction(compiler, 1, 0, 0, dst, dstw);
557 FAIL_IF(!inst);
558 *inst++ = POP_rm;
559 return SLJIT_SUCCESS;
560 }
561
sljit_emit_fast_return(struct sljit_compiler * compiler,sljit_s32 src,sljit_sw srcw)562 SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_fast_return(struct sljit_compiler *compiler, sljit_s32 src, sljit_sw srcw)
563 {
564 sljit_u8 *inst;
565
566 CHECK_ERROR();
567 CHECK(check_sljit_emit_fast_return(compiler, src, srcw));
568 ADJUST_LOCAL_OFFSET(src, srcw);
569
570 CHECK_EXTRA_REGS(src, srcw, (void)0);
571
572 if (FAST_IS_REG(src)) {
573 inst = (sljit_u8*)ensure_buf(compiler, 1 + 1 + 1);
574 FAIL_IF(!inst);
575
576 INC_SIZE(1 + 1);
577 PUSH_REG(reg_map[src]);
578 }
579 else if (src & SLJIT_MEM) {
580 inst = emit_x86_instruction(compiler, 1, 0, 0, src, srcw);
581 FAIL_IF(!inst);
582 *inst++ = GROUP_FF;
583 *inst |= PUSH_rm;
584
585 inst = (sljit_u8*)ensure_buf(compiler, 1 + 1);
586 FAIL_IF(!inst);
587 INC_SIZE(1);
588 }
589 else {
590 /* SLJIT_IMM. */
591 inst = (sljit_u8*)ensure_buf(compiler, 1 + 5 + 1);
592 FAIL_IF(!inst);
593
594 INC_SIZE(5 + 1);
595 *inst++ = PUSH_i32;
596 sljit_unaligned_store_sw(inst, srcw);
597 inst += sizeof(sljit_sw);
598 }
599
600 RET();
601 return SLJIT_SUCCESS;
602 }
603
