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 32-bit arch dependent functions. */
28 
emit_do_imm(struct sljit_compiler * compiler,sljit_ub opcode,sljit_sw imm)29 static sljit_si emit_do_imm(struct sljit_compiler *compiler, sljit_ub opcode, sljit_sw imm)
30 {
31 	sljit_ub *inst;
32 
33 	inst = (sljit_ub*)ensure_buf(compiler, 1 + 1 + sizeof(sljit_sw));
34 	FAIL_IF(!inst);
35 	INC_SIZE(1 + sizeof(sljit_sw));
36 	*inst++ = opcode;
37 	*(sljit_sw*)inst = imm;
38 	return SLJIT_SUCCESS;
39 }
40 
generate_far_jump_code(struct sljit_jump * jump,sljit_ub * code_ptr,sljit_si type)41 static sljit_ub* generate_far_jump_code(struct sljit_jump *jump, sljit_ub *code_ptr, sljit_si type)
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_sw*)code_ptr = jump->u.target - (jump->addr + 4);
61 	code_ptr += 4;
62 
63 	return code_ptr;
64 }
65 
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)66 SLJIT_API_FUNC_ATTRIBUTE sljit_si sljit_emit_enter(struct sljit_compiler *compiler,
67 	sljit_si options, sljit_si args, sljit_si scratches, sljit_si saveds,
68 	sljit_si fscratches, sljit_si fsaveds, sljit_si local_size)
69 {
70 	sljit_si size;
71 	sljit_ub *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 	compiler->flags_saved = 0;
79 
80 	size = 1 + (scratches > 7 ? (scratches - 7) : 0) + (saveds <= 3 ? saveds : 3);
81 #if (defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL)
82 	size += (args > 0 ? (args * 2) : 0) + (args > 2 ? 2 : 0);
83 #else
84 	size += (args > 0 ? (2 + args * 3) : 0);
85 #endif
86 	inst = (sljit_ub*)ensure_buf(compiler, 1 + size);
87 	FAIL_IF(!inst);
88 
89 	INC_SIZE(size);
90 	PUSH_REG(reg_map[TMP_REG1]);
91 #if !(defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL)
92 	if (args > 0) {
93 		*inst++ = MOV_r_rm;
94 		*inst++ = MOD_REG | (reg_map[TMP_REG1] << 3) | 0x4 /* esp */;
95 	}
96 #endif
97 	if (saveds > 2 || scratches > 7)
98 		PUSH_REG(reg_map[SLJIT_S2]);
99 	if (saveds > 1 || scratches > 8)
100 		PUSH_REG(reg_map[SLJIT_S1]);
101 	if (saveds > 0 || scratches > 9)
102 		PUSH_REG(reg_map[SLJIT_S0]);
103 
104 #if (defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL)
105 	if (args > 0) {
106 		*inst++ = MOV_r_rm;
107 		*inst++ = MOD_REG | (reg_map[SLJIT_S0] << 3) | reg_map[SLJIT_R2];
108 	}
109 	if (args > 1) {
110 		*inst++ = MOV_r_rm;
111 		*inst++ = MOD_REG | (reg_map[SLJIT_S1] << 3) | reg_map[SLJIT_R1];
112 	}
113 	if (args > 2) {
114 		*inst++ = MOV_r_rm;
115 		*inst++ = MOD_DISP8 | (reg_map[SLJIT_S2] << 3) | 0x4 /* esp */;
116 		*inst++ = 0x24;
117 		*inst++ = sizeof(sljit_sw) * (3 + 2); /* saveds >= 3 as well. */
118 	}
119 #else
120 	if (args > 0) {
121 		*inst++ = MOV_r_rm;
122 		*inst++ = MOD_DISP8 | (reg_map[SLJIT_S0] << 3) | reg_map[TMP_REG1];
123 		*inst++ = sizeof(sljit_sw) * 2;
124 	}
125 	if (args > 1) {
126 		*inst++ = MOV_r_rm;
127 		*inst++ = MOD_DISP8 | (reg_map[SLJIT_S1] << 3) | reg_map[TMP_REG1];
128 		*inst++ = sizeof(sljit_sw) * 3;
129 	}
130 	if (args > 2) {
131 		*inst++ = MOV_r_rm;
132 		*inst++ = MOD_DISP8 | (reg_map[SLJIT_S2] << 3) | reg_map[TMP_REG1];
133 		*inst++ = sizeof(sljit_sw) * 4;
134 	}
135 #endif
136 
137 	SLJIT_COMPILE_ASSERT(SLJIT_LOCALS_OFFSET >= (2 + 4) * sizeof(sljit_uw), require_at_least_two_words);
138 #if defined(__APPLE__)
139 	/* Ignore pushed registers and SLJIT_LOCALS_OFFSET when computing the aligned local size. */
140 	saveds = (2 + (scratches > 7 ? (scratches - 7) : 0) + (saveds <= 3 ? saveds : 3)) * sizeof(sljit_uw);
141 	local_size = ((SLJIT_LOCALS_OFFSET + saveds + local_size + 15) & ~15) - saveds;
142 #else
143 	if (options & SLJIT_DOUBLE_ALIGNMENT) {
144 		local_size = SLJIT_LOCALS_OFFSET + ((local_size + 7) & ~7);
145 
146 		inst = (sljit_ub*)ensure_buf(compiler, 1 + 17);
147 		FAIL_IF(!inst);
148 
149 		INC_SIZE(17);
150 		inst[0] = MOV_r_rm;
151 		inst[1] = MOD_REG | (reg_map[TMP_REG1] << 3) | reg_map[SLJIT_SP];
152 		inst[2] = GROUP_F7;
153 		inst[3] = MOD_REG | (0 << 3) | reg_map[SLJIT_SP];
154 		*(sljit_sw*)(inst + 4) = 0x4;
155 		inst[8] = JNE_i8;
156 		inst[9] = 6;
157 		inst[10] = GROUP_BINARY_81;
158 		inst[11] = MOD_REG | (5 << 3) | reg_map[SLJIT_SP];
159 		*(sljit_sw*)(inst + 12) = 0x4;
160 		inst[16] = PUSH_r + reg_map[TMP_REG1];
161 	}
162 	else
163 		local_size = SLJIT_LOCALS_OFFSET + ((local_size + 3) & ~3);
164 #endif
165 
166 	compiler->local_size = local_size;
167 #ifdef _WIN32
168 	if (local_size > 1024) {
169 #if (defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL)
170 		FAIL_IF(emit_do_imm(compiler, MOV_r_i32 + reg_map[SLJIT_R0], local_size));
171 #else
172 		local_size -= SLJIT_LOCALS_OFFSET;
173 		FAIL_IF(emit_do_imm(compiler, MOV_r_i32 + reg_map[SLJIT_R0], local_size));
174 		FAIL_IF(emit_non_cum_binary(compiler, SUB_r_rm, SUB_rm_r, SUB, SUB_EAX_i32,
175 			SLJIT_SP, 0, SLJIT_SP, 0, SLJIT_IMM, SLJIT_LOCALS_OFFSET));
176 #endif
177 		FAIL_IF(sljit_emit_ijump(compiler, SLJIT_CALL1, SLJIT_IMM, SLJIT_FUNC_OFFSET(sljit_grow_stack)));
178 	}
179 #endif
180 
181 	SLJIT_ASSERT(local_size > 0);
182 	return emit_non_cum_binary(compiler, SUB_r_rm, SUB_rm_r, SUB, SUB_EAX_i32,
183 		SLJIT_SP, 0, SLJIT_SP, 0, SLJIT_IMM, local_size);
184 }
185 
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)186 SLJIT_API_FUNC_ATTRIBUTE sljit_si sljit_set_context(struct sljit_compiler *compiler,
187 	sljit_si options, sljit_si args, sljit_si scratches, sljit_si saveds,
188 	sljit_si fscratches, sljit_si fsaveds, sljit_si local_size)
189 {
190 	CHECK_ERROR();
191 	CHECK(check_sljit_set_context(compiler, options, args, scratches, saveds, fscratches, fsaveds, local_size));
192 	set_set_context(compiler, options, args, scratches, saveds, fscratches, fsaveds, local_size);
193 
194 	compiler->args = args;
195 
196 #if defined(__APPLE__)
197 	saveds = (2 + (scratches > 7 ? (scratches - 7) : 0) + (saveds <= 3 ? saveds : 3)) * sizeof(sljit_uw);
198 	compiler->local_size = ((SLJIT_LOCALS_OFFSET + saveds + local_size + 15) & ~15) - saveds;
199 #else
200 	if (options & SLJIT_DOUBLE_ALIGNMENT)
201 		compiler->local_size = SLJIT_LOCALS_OFFSET + ((local_size + 7) & ~7);
202 	else
203 		compiler->local_size = SLJIT_LOCALS_OFFSET + ((local_size + 3) & ~3);
204 #endif
205 	return SLJIT_SUCCESS;
206 }
207 
sljit_emit_return(struct sljit_compiler * compiler,sljit_si op,sljit_si src,sljit_sw srcw)208 SLJIT_API_FUNC_ATTRIBUTE sljit_si sljit_emit_return(struct sljit_compiler *compiler, sljit_si op, sljit_si src, sljit_sw srcw)
209 {
210 	sljit_si size;
211 	sljit_ub *inst;
212 
213 	CHECK_ERROR();
214 	CHECK(check_sljit_emit_return(compiler, op, src, srcw));
215 	SLJIT_ASSERT(compiler->args >= 0);
216 
217 	compiler->flags_saved = 0;
218 	FAIL_IF(emit_mov_before_return(compiler, op, src, srcw));
219 
220 	SLJIT_ASSERT(compiler->local_size > 0);
221 	FAIL_IF(emit_cum_binary(compiler, ADD_r_rm, ADD_rm_r, ADD, ADD_EAX_i32,
222 		SLJIT_SP, 0, SLJIT_SP, 0, SLJIT_IMM, compiler->local_size));
223 
224 #if !defined(__APPLE__)
225 	if (compiler->options & SLJIT_DOUBLE_ALIGNMENT) {
226 		inst = (sljit_ub*)ensure_buf(compiler, 1 + 3);
227 		FAIL_IF(!inst);
228 
229 		INC_SIZE(3);
230 		inst[0] = MOV_r_rm;
231 		inst[1] = (reg_map[SLJIT_SP] << 3) | 0x4 /* SIB */;
232 		inst[2] = (4 << 3) | reg_map[SLJIT_SP];
233 	}
234 #endif
235 
236 	size = 2 + (compiler->scratches > 7 ? (compiler->scratches - 7) : 0) +
237 		(compiler->saveds <= 3 ? compiler->saveds : 3);
238 #if (defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL)
239 	if (compiler->args > 2)
240 		size += 2;
241 #else
242 	if (compiler->args > 0)
243 		size += 2;
244 #endif
245 	inst = (sljit_ub*)ensure_buf(compiler, 1 + size);
246 	FAIL_IF(!inst);
247 
248 	INC_SIZE(size);
249 
250 	if (compiler->saveds > 0 || compiler->scratches > 9)
251 		POP_REG(reg_map[SLJIT_S0]);
252 	if (compiler->saveds > 1 || compiler->scratches > 8)
253 		POP_REG(reg_map[SLJIT_S1]);
254 	if (compiler->saveds > 2 || compiler->scratches > 7)
255 		POP_REG(reg_map[SLJIT_S2]);
256 	POP_REG(reg_map[TMP_REG1]);
257 #if (defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL)
258 	if (compiler->args > 2)
259 		RET_I16(sizeof(sljit_sw));
260 	else
261 		RET();
262 #else
263 	RET();
264 #endif
265 
266 	return SLJIT_SUCCESS;
267 }
268 
269 /* --------------------------------------------------------------------- */
270 /*  Operators                                                            */
271 /* --------------------------------------------------------------------- */
272 
273 /* Size contains the flags as well. */
emit_x86_instruction(struct sljit_compiler * compiler,sljit_si size,sljit_si a,sljit_sw imma,sljit_si b,sljit_sw immb)274 static sljit_ub* emit_x86_instruction(struct sljit_compiler *compiler, sljit_si size,
275 	/* The register or immediate operand. */
276 	sljit_si a, sljit_sw imma,
277 	/* The general operand (not immediate). */
278 	sljit_si b, sljit_sw immb)
279 {
280 	sljit_ub *inst;
281 	sljit_ub *buf_ptr;
282 	sljit_si flags = size & ~0xf;
283 	sljit_si inst_size;
284 
285 	/* Both cannot be switched on. */
286 	SLJIT_ASSERT((flags & (EX86_BIN_INS | EX86_SHIFT_INS)) != (EX86_BIN_INS | EX86_SHIFT_INS));
287 	/* Size flags not allowed for typed instructions. */
288 	SLJIT_ASSERT(!(flags & (EX86_BIN_INS | EX86_SHIFT_INS)) || (flags & (EX86_BYTE_ARG | EX86_HALF_ARG)) == 0);
289 	/* Both size flags cannot be switched on. */
290 	SLJIT_ASSERT((flags & (EX86_BYTE_ARG | EX86_HALF_ARG)) != (EX86_BYTE_ARG | EX86_HALF_ARG));
291 	/* SSE2 and immediate is not possible. */
292 	SLJIT_ASSERT(!(a & SLJIT_IMM) || !(flags & EX86_SSE2));
293 	SLJIT_ASSERT((flags & (EX86_PREF_F2 | EX86_PREF_F3)) != (EX86_PREF_F2 | EX86_PREF_F3)
294 		&& (flags & (EX86_PREF_F2 | EX86_PREF_66)) != (EX86_PREF_F2 | EX86_PREF_66)
295 		&& (flags & (EX86_PREF_F3 | EX86_PREF_66)) != (EX86_PREF_F3 | EX86_PREF_66));
296 
297 	size &= 0xf;
298 	inst_size = size;
299 
300 	if (flags & (EX86_PREF_F2 | EX86_PREF_F3))
301 		inst_size++;
302 	if (flags & EX86_PREF_66)
303 		inst_size++;
304 
305 	/* Calculate size of b. */
306 	inst_size += 1; /* mod r/m byte. */
307 	if (b & SLJIT_MEM) {
308 		if ((b & REG_MASK) == SLJIT_UNUSED)
309 			inst_size += sizeof(sljit_sw);
310 		else if (immb != 0 && !(b & OFFS_REG_MASK)) {
311 			/* Immediate operand. */
312 			if (immb <= 127 && immb >= -128)
313 				inst_size += sizeof(sljit_sb);
314 			else
315 				inst_size += sizeof(sljit_sw);
316 		}
317 
318 		if ((b & REG_MASK) == SLJIT_SP && !(b & OFFS_REG_MASK))
319 			b |= TO_OFFS_REG(SLJIT_SP);
320 
321 		if ((b & OFFS_REG_MASK) != SLJIT_UNUSED)
322 			inst_size += 1; /* SIB byte. */
323 	}
324 
325 	/* Calculate size of a. */
326 	if (a & SLJIT_IMM) {
327 		if (flags & EX86_BIN_INS) {
328 			if (imma <= 127 && imma >= -128) {
329 				inst_size += 1;
330 				flags |= EX86_BYTE_ARG;
331 			} else
332 				inst_size += 4;
333 		}
334 		else if (flags & EX86_SHIFT_INS) {
335 			imma &= 0x1f;
336 			if (imma != 1) {
337 				inst_size ++;
338 				flags |= EX86_BYTE_ARG;
339 			}
340 		} else if (flags & EX86_BYTE_ARG)
341 			inst_size++;
342 		else if (flags & EX86_HALF_ARG)
343 			inst_size += sizeof(short);
344 		else
345 			inst_size += sizeof(sljit_sw);
346 	}
347 	else
348 		SLJIT_ASSERT(!(flags & EX86_SHIFT_INS) || a == SLJIT_PREF_SHIFT_REG);
349 
350 	inst = (sljit_ub*)ensure_buf(compiler, 1 + inst_size);
351 	PTR_FAIL_IF(!inst);
352 
353 	/* Encoding the byte. */
354 	INC_SIZE(inst_size);
355 	if (flags & EX86_PREF_F2)
356 		*inst++ = 0xf2;
357 	if (flags & EX86_PREF_F3)
358 		*inst++ = 0xf3;
359 	if (flags & EX86_PREF_66)
360 		*inst++ = 0x66;
361 
362 	buf_ptr = inst + size;
363 
364 	/* Encode mod/rm byte. */
365 	if (!(flags & EX86_SHIFT_INS)) {
366 		if ((flags & EX86_BIN_INS) && (a & SLJIT_IMM))
367 			*inst = (flags & EX86_BYTE_ARG) ? GROUP_BINARY_83 : GROUP_BINARY_81;
368 
369 		if ((a & SLJIT_IMM) || (a == 0))
370 			*buf_ptr = 0;
371 		else if (!(flags & EX86_SSE2_OP1))
372 			*buf_ptr = reg_map[a] << 3;
373 		else
374 			*buf_ptr = a << 3;
375 	}
376 	else {
377 		if (a & SLJIT_IMM) {
378 			if (imma == 1)
379 				*inst = GROUP_SHIFT_1;
380 			else
381 				*inst = GROUP_SHIFT_N;
382 		} else
383 			*inst = GROUP_SHIFT_CL;
384 		*buf_ptr = 0;
385 	}
386 
387 	if (!(b & SLJIT_MEM))
388 		*buf_ptr++ |= MOD_REG + ((!(flags & EX86_SSE2_OP2)) ? reg_map[b] : b);
389 	else if ((b & REG_MASK) != SLJIT_UNUSED) {
390 		if ((b & OFFS_REG_MASK) == SLJIT_UNUSED || (b & OFFS_REG_MASK) == TO_OFFS_REG(SLJIT_SP)) {
391 			if (immb != 0) {
392 				if (immb <= 127 && immb >= -128)
393 					*buf_ptr |= 0x40;
394 				else
395 					*buf_ptr |= 0x80;
396 			}
397 
398 			if ((b & OFFS_REG_MASK) == SLJIT_UNUSED)
399 				*buf_ptr++ |= reg_map[b & REG_MASK];
400 			else {
401 				*buf_ptr++ |= 0x04;
402 				*buf_ptr++ = reg_map[b & REG_MASK] | (reg_map[OFFS_REG(b)] << 3);
403 			}
404 
405 			if (immb != 0) {
406 				if (immb <= 127 && immb >= -128)
407 					*buf_ptr++ = immb; /* 8 bit displacement. */
408 				else {
409 					*(sljit_sw*)buf_ptr = immb; /* 32 bit displacement. */
410 					buf_ptr += sizeof(sljit_sw);
411 				}
412 			}
413 		}
414 		else {
415 			*buf_ptr++ |= 0x04;
416 			*buf_ptr++ = reg_map[b & REG_MASK] | (reg_map[OFFS_REG(b)] << 3) | (immb << 6);
417 		}
418 	}
419 	else {
420 		*buf_ptr++ |= 0x05;
421 		*(sljit_sw*)buf_ptr = immb; /* 32 bit displacement. */
422 		buf_ptr += sizeof(sljit_sw);
423 	}
424 
425 	if (a & SLJIT_IMM) {
426 		if (flags & EX86_BYTE_ARG)
427 			*buf_ptr = imma;
428 		else if (flags & EX86_HALF_ARG)
429 			*(short*)buf_ptr = imma;
430 		else if (!(flags & EX86_SHIFT_INS))
431 			*(sljit_sw*)buf_ptr = imma;
432 	}
433 
434 	return !(flags & EX86_SHIFT_INS) ? inst : (inst + 1);
435 }
436 
437 /* --------------------------------------------------------------------- */
438 /*  Call / return instructions                                           */
439 /* --------------------------------------------------------------------- */
440 
call_with_args(struct sljit_compiler * compiler,sljit_si type)441 static SLJIT_INLINE sljit_si call_with_args(struct sljit_compiler *compiler, sljit_si type)
442 {
443 	sljit_ub *inst;
444 
445 #if (defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL)
446 	inst = (sljit_ub*)ensure_buf(compiler, type >= SLJIT_CALL3 ? 1 + 2 + 1 : 1 + 2);
447 	FAIL_IF(!inst);
448 	INC_SIZE(type >= SLJIT_CALL3 ? 2 + 1 : 2);
449 
450 	if (type >= SLJIT_CALL3)
451 		PUSH_REG(reg_map[SLJIT_R2]);
452 	*inst++ = MOV_r_rm;
453 	*inst++ = MOD_REG | (reg_map[SLJIT_R2] << 3) | reg_map[SLJIT_R0];
454 #else
455 	inst = (sljit_ub*)ensure_buf(compiler, 1 + 4 * (type - SLJIT_CALL0));
456 	FAIL_IF(!inst);
457 	INC_SIZE(4 * (type - SLJIT_CALL0));
458 
459 	*inst++ = MOV_rm_r;
460 	*inst++ = MOD_DISP8 | (reg_map[SLJIT_R0] << 3) | 0x4 /* SIB */;
461 	*inst++ = (0x4 /* none*/ << 3) | reg_map[SLJIT_SP];
462 	*inst++ = 0;
463 	if (type >= SLJIT_CALL2) {
464 		*inst++ = MOV_rm_r;
465 		*inst++ = MOD_DISP8 | (reg_map[SLJIT_R1] << 3) | 0x4 /* SIB */;
466 		*inst++ = (0x4 /* none*/ << 3) | reg_map[SLJIT_SP];
467 		*inst++ = sizeof(sljit_sw);
468 	}
469 	if (type >= SLJIT_CALL3) {
470 		*inst++ = MOV_rm_r;
471 		*inst++ = MOD_DISP8 | (reg_map[SLJIT_R2] << 3) | 0x4 /* SIB */;
472 		*inst++ = (0x4 /* none*/ << 3) | reg_map[SLJIT_SP];
473 		*inst++ = 2 * sizeof(sljit_sw);
474 	}
475 #endif
476 	return SLJIT_SUCCESS;
477 }
478 
sljit_emit_fast_enter(struct sljit_compiler * compiler,sljit_si dst,sljit_sw dstw)479 SLJIT_API_FUNC_ATTRIBUTE sljit_si sljit_emit_fast_enter(struct sljit_compiler *compiler, sljit_si dst, sljit_sw dstw)
480 {
481 	sljit_ub *inst;
482 
483 	CHECK_ERROR();
484 	CHECK(check_sljit_emit_fast_enter(compiler, dst, dstw));
485 	ADJUST_LOCAL_OFFSET(dst, dstw);
486 
487 	CHECK_EXTRA_REGS(dst, dstw, (void)0);
488 
489 	/* For UNUSED dst. Uncommon, but possible. */
490 	if (dst == SLJIT_UNUSED)
491 		dst = TMP_REG1;
492 
493 	if (FAST_IS_REG(dst)) {
494 		/* Unused dest is possible here. */
495 		inst = (sljit_ub*)ensure_buf(compiler, 1 + 1);
496 		FAIL_IF(!inst);
497 
498 		INC_SIZE(1);
499 		POP_REG(reg_map[dst]);
500 		return SLJIT_SUCCESS;
501 	}
502 
503 	/* Memory. */
504 	inst = emit_x86_instruction(compiler, 1, 0, 0, dst, dstw);
505 	FAIL_IF(!inst);
506 	*inst++ = POP_rm;
507 	return SLJIT_SUCCESS;
508 }
509 
sljit_emit_fast_return(struct sljit_compiler * compiler,sljit_si src,sljit_sw srcw)510 SLJIT_API_FUNC_ATTRIBUTE sljit_si sljit_emit_fast_return(struct sljit_compiler *compiler, sljit_si src, sljit_sw srcw)
511 {
512 	sljit_ub *inst;
513 
514 	CHECK_ERROR();
515 	CHECK(check_sljit_emit_fast_return(compiler, src, srcw));
516 	ADJUST_LOCAL_OFFSET(src, srcw);
517 
518 	CHECK_EXTRA_REGS(src, srcw, (void)0);
519 
520 	if (FAST_IS_REG(src)) {
521 		inst = (sljit_ub*)ensure_buf(compiler, 1 + 1 + 1);
522 		FAIL_IF(!inst);
523 
524 		INC_SIZE(1 + 1);
525 		PUSH_REG(reg_map[src]);
526 	}
527 	else if (src & SLJIT_MEM) {
528 		inst = emit_x86_instruction(compiler, 1, 0, 0, src, srcw);
529 		FAIL_IF(!inst);
530 		*inst++ = GROUP_FF;
531 		*inst |= PUSH_rm;
532 
533 		inst = (sljit_ub*)ensure_buf(compiler, 1 + 1);
534 		FAIL_IF(!inst);
535 		INC_SIZE(1);
536 	}
537 	else {
538 		/* SLJIT_IMM. */
539 		inst = (sljit_ub*)ensure_buf(compiler, 1 + 5 + 1);
540 		FAIL_IF(!inst);
541 
542 		INC_SIZE(5 + 1);
543 		*inst++ = PUSH_i32;
544 		*(sljit_sw*)inst = srcw;
545 		inst += sizeof(sljit_sw);
546 	}
547 
548 	RET();
549 	return SLJIT_SUCCESS;
550 }
551