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_sw executable_offset)41 static sljit_u8* generate_far_jump_code(struct sljit_jump *jump, sljit_u8 *code_ptr, sljit_sw executable_offset)
42 {
43 sljit_s32 type = jump->flags >> TYPE_SHIFT;
44
45 if (type == SLJIT_JUMP) {
46 *code_ptr++ = JMP_i32;
47 jump->addr++;
48 }
49 else if (type >= SLJIT_FAST_CALL) {
50 *code_ptr++ = CALL_i32;
51 jump->addr++;
52 }
53 else {
54 *code_ptr++ = GROUP_0F;
55 *code_ptr++ = get_jump_code(type);
56 jump->addr += 2;
57 }
58
59 if (jump->flags & JUMP_LABEL)
60 jump->flags |= PATCH_MW;
61 else
62 sljit_unaligned_store_sw(code_ptr, jump->u.target - (jump->addr + 4) - (sljit_uw)executable_offset);
63 code_ptr += 4;
64
65 return code_ptr;
66 }
67
sljit_emit_enter(struct sljit_compiler * compiler,sljit_s32 options,sljit_s32 arg_types,sljit_s32 scratches,sljit_s32 saveds,sljit_s32 fscratches,sljit_s32 fsaveds,sljit_s32 local_size)68 SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_enter(struct sljit_compiler *compiler,
69 sljit_s32 options, sljit_s32 arg_types, sljit_s32 scratches, sljit_s32 saveds,
70 sljit_s32 fscratches, sljit_s32 fsaveds, sljit_s32 local_size)
71 {
72 sljit_s32 args, size;
73 sljit_u8 *inst;
74
75 CHECK_ERROR();
76 CHECK(check_sljit_emit_enter(compiler, options, arg_types, scratches, saveds, fscratches, fsaveds, local_size));
77 set_emit_enter(compiler, options, arg_types, scratches, saveds, fscratches, fsaveds, local_size);
78
79 /* Emit ENDBR32 at function entry if needed. */
80 FAIL_IF(emit_endbranch(compiler));
81
82 args = get_arg_count(arg_types);
83 compiler->args = args;
84
85 /* [esp+0] for saving temporaries and function calls. */
86 compiler->stack_tmp_size = 2 * sizeof(sljit_sw);
87
88 #if !(defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL)
89 if (scratches > 3)
90 compiler->stack_tmp_size = 3 * sizeof(sljit_sw);
91 #endif
92
93 compiler->saveds_offset = compiler->stack_tmp_size;
94 if (scratches > 3)
95 compiler->saveds_offset += ((scratches > (3 + 6)) ? 6 : (scratches - 3)) * sizeof(sljit_sw);
96
97 compiler->locals_offset = compiler->saveds_offset;
98
99 if (saveds > 3)
100 compiler->locals_offset += (saveds - 3) * sizeof(sljit_sw);
101
102 if (options & SLJIT_F64_ALIGNMENT)
103 compiler->locals_offset = (compiler->locals_offset + sizeof(sljit_f64) - 1) & ~(sizeof(sljit_f64) - 1);
104
105 size = 1 + (scratches > 9 ? (scratches - 9) : 0) + (saveds <= 3 ? saveds : 3);
106 #if (defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL)
107 size += (args > 0 ? (args * 2) : 0) + (args > 2 ? 2 : 0);
108 #else
109 size += (args > 0 ? (2 + args * 3) : 0);
110 #endif
111 inst = (sljit_u8*)ensure_buf(compiler, 1 + size);
112 FAIL_IF(!inst);
113
114 INC_SIZE(size);
115 PUSH_REG(reg_map[TMP_REG1]);
116 #if !(defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL)
117 if (args > 0) {
118 *inst++ = MOV_r_rm;
119 *inst++ = MOD_REG | (reg_map[TMP_REG1] << 3) | 0x4 /* esp */;
120 }
121 #endif
122 if (saveds > 2 || scratches > 9)
123 PUSH_REG(reg_map[SLJIT_S2]);
124 if (saveds > 1 || scratches > 10)
125 PUSH_REG(reg_map[SLJIT_S1]);
126 if (saveds > 0 || scratches > 11)
127 PUSH_REG(reg_map[SLJIT_S0]);
128
129 #if (defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL)
130 if (args > 0) {
131 inst[0] = MOV_r_rm;
132 inst[1] = MOD_REG | (reg_map[SLJIT_S0] << 3) | reg_map[SLJIT_R2];
133 inst += 2;
134 }
135 if (args > 1) {
136 inst[0] = MOV_r_rm;
137 inst[1] = MOD_REG | (reg_map[SLJIT_S1] << 3) | reg_map[SLJIT_R1];
138 inst += 2;
139 }
140 if (args > 2) {
141 inst[0] = MOV_r_rm;
142 inst[1] = MOD_DISP8 | (reg_map[SLJIT_S2] << 3) | 0x4 /* esp */;
143 inst[2] = 0x24;
144 inst[3] = sizeof(sljit_sw) * (3 + 2); /* saveds >= 3 as well. */
145 }
146 #else
147 if (args > 0) {
148 inst[0] = MOV_r_rm;
149 inst[1] = MOD_DISP8 | (reg_map[SLJIT_S0] << 3) | reg_map[TMP_REG1];
150 inst[2] = sizeof(sljit_sw) * 2;
151 inst += 3;
152 }
153 if (args > 1) {
154 inst[0] = MOV_r_rm;
155 inst[1] = MOD_DISP8 | (reg_map[SLJIT_S1] << 3) | reg_map[TMP_REG1];
156 inst[2] = sizeof(sljit_sw) * 3;
157 inst += 3;
158 }
159 if (args > 2) {
160 inst[0] = MOV_r_rm;
161 inst[1] = MOD_DISP8 | (reg_map[SLJIT_S2] << 3) | reg_map[TMP_REG1];
162 inst[2] = sizeof(sljit_sw) * 4;
163 }
164 #endif
165
166 SLJIT_ASSERT(SLJIT_LOCALS_OFFSET > 0);
167
168 #if defined(__APPLE__)
169 /* Ignore pushed registers and SLJIT_LOCALS_OFFSET when computing the aligned local size. */
170 saveds = (2 + (scratches > 9 ? (scratches - 9) : 0) + (saveds <= 3 ? saveds : 3)) * sizeof(sljit_uw);
171 local_size = ((SLJIT_LOCALS_OFFSET + saveds + local_size + 15) & ~15) - saveds;
172 #else
173 if (options & SLJIT_F64_ALIGNMENT)
174 local_size = SLJIT_LOCALS_OFFSET + ((local_size + sizeof(sljit_f64) - 1) & ~(sizeof(sljit_f64) - 1));
175 else
176 local_size = SLJIT_LOCALS_OFFSET + ((local_size + sizeof(sljit_sw) - 1) & ~(sizeof(sljit_sw) - 1));
177 #endif
178
179 compiler->local_size = local_size;
180
181 #ifdef _WIN32
182 if (local_size > 0) {
183 if (local_size <= 4 * 4096) {
184 if (local_size > 4096)
185 EMIT_MOV(compiler, TMP_REG1, 0, SLJIT_MEM1(SLJIT_SP), -4096);
186 if (local_size > 2 * 4096)
187 EMIT_MOV(compiler, TMP_REG1, 0, SLJIT_MEM1(SLJIT_SP), -4096 * 2);
188 if (local_size > 3 * 4096)
189 EMIT_MOV(compiler, TMP_REG1, 0, SLJIT_MEM1(SLJIT_SP), -4096 * 3);
190 }
191 else {
192 EMIT_MOV(compiler, SLJIT_R0, 0, SLJIT_SP, 0);
193 EMIT_MOV(compiler, SLJIT_R1, 0, SLJIT_IMM, (local_size - 1) >> 12);
194
195 SLJIT_ASSERT (reg_map[SLJIT_R0] == 0);
196
197 EMIT_MOV(compiler, TMP_REG1, 0, SLJIT_MEM1(SLJIT_R0), -4096);
198 FAIL_IF(emit_non_cum_binary(compiler, BINARY_OPCODE(SUB),
199 SLJIT_R0, 0, SLJIT_R0, 0, SLJIT_IMM, 4096));
200 FAIL_IF(emit_non_cum_binary(compiler, BINARY_OPCODE(SUB),
201 SLJIT_R1, 0, SLJIT_R1, 0, SLJIT_IMM, 1));
202
203 inst = (sljit_u8*)ensure_buf(compiler, 1 + 2);
204 FAIL_IF(!inst);
205
206 INC_SIZE(2);
207 inst[0] = JNE_i8;
208 inst[1] = (sljit_s8) -16;
209 }
210
211 EMIT_MOV(compiler, TMP_REG1, 0, SLJIT_MEM1(SLJIT_SP), -local_size);
212 }
213 #endif
214
215 SLJIT_ASSERT(local_size > 0);
216
217 #if !defined(__APPLE__)
218 if (options & SLJIT_F64_ALIGNMENT) {
219 EMIT_MOV(compiler, TMP_REG1, 0, SLJIT_SP, 0);
220
221 /* Some space might allocated during sljit_grow_stack() above on WIN32. */
222 FAIL_IF(emit_non_cum_binary(compiler, BINARY_OPCODE(SUB),
223 SLJIT_SP, 0, SLJIT_SP, 0, SLJIT_IMM, local_size + sizeof(sljit_sw)));
224
225 #if defined _WIN32 && !(defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL)
226 if (compiler->local_size > 1024)
227 FAIL_IF(emit_cum_binary(compiler, BINARY_OPCODE(ADD),
228 TMP_REG1, 0, TMP_REG1, 0, SLJIT_IMM, sizeof(sljit_sw)));
229 #endif
230
231 inst = (sljit_u8*)ensure_buf(compiler, 1 + 6);
232 FAIL_IF(!inst);
233
234 INC_SIZE(6);
235 inst[0] = GROUP_BINARY_81;
236 inst[1] = MOD_REG | AND | reg_map[SLJIT_SP];
237 sljit_unaligned_store_sw(inst + 2, ~(sizeof(sljit_f64) - 1));
238
239 /* The real local size must be used. */
240 return emit_mov(compiler, SLJIT_MEM1(SLJIT_SP), compiler->local_size, TMP_REG1, 0);
241 }
242 #endif
243 return emit_non_cum_binary(compiler, BINARY_OPCODE(SUB),
244 SLJIT_SP, 0, SLJIT_SP, 0, SLJIT_IMM, local_size);
245 }
246
sljit_set_context(struct sljit_compiler * compiler,sljit_s32 options,sljit_s32 arg_types,sljit_s32 scratches,sljit_s32 saveds,sljit_s32 fscratches,sljit_s32 fsaveds,sljit_s32 local_size)247 SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_set_context(struct sljit_compiler *compiler,
248 sljit_s32 options, sljit_s32 arg_types, sljit_s32 scratches, sljit_s32 saveds,
249 sljit_s32 fscratches, sljit_s32 fsaveds, sljit_s32 local_size)
250 {
251 CHECK_ERROR();
252 CHECK(check_sljit_set_context(compiler, options, arg_types, scratches, saveds, fscratches, fsaveds, local_size));
253 set_set_context(compiler, options, arg_types, scratches, saveds, fscratches, fsaveds, local_size);
254
255 compiler->args = get_arg_count(arg_types);
256
257 /* [esp+0] for saving temporaries and function calls. */
258 compiler->stack_tmp_size = 2 * sizeof(sljit_sw);
259
260 #if !(defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL)
261 if (scratches > 3)
262 compiler->stack_tmp_size = 3 * sizeof(sljit_sw);
263 #endif
264
265 compiler->saveds_offset = compiler->stack_tmp_size;
266 if (scratches > 3)
267 compiler->saveds_offset += ((scratches > (3 + 6)) ? 6 : (scratches - 3)) * sizeof(sljit_sw);
268
269 compiler->locals_offset = compiler->saveds_offset;
270
271 if (saveds > 3)
272 compiler->locals_offset += (saveds - 3) * sizeof(sljit_sw);
273
274 if (options & SLJIT_F64_ALIGNMENT)
275 compiler->locals_offset = (compiler->locals_offset + sizeof(sljit_f64) - 1) & ~(sizeof(sljit_f64) - 1);
276
277 #if defined(__APPLE__)
278 saveds = (2 + (scratches > 9 ? (scratches - 9) : 0) + (saveds <= 3 ? saveds : 3)) * sizeof(sljit_uw);
279 compiler->local_size = ((SLJIT_LOCALS_OFFSET + saveds + local_size + 15) & ~15) - saveds;
280 #else
281 if (options & SLJIT_F64_ALIGNMENT)
282 compiler->local_size = SLJIT_LOCALS_OFFSET + ((local_size + sizeof(sljit_f64) - 1) & ~(sizeof(sljit_f64) - 1));
283 else
284 compiler->local_size = SLJIT_LOCALS_OFFSET + ((local_size + sizeof(sljit_sw) - 1) & ~(sizeof(sljit_sw) - 1));
285 #endif
286 return SLJIT_SUCCESS;
287 }
288
sljit_emit_return(struct sljit_compiler * compiler,sljit_s32 op,sljit_s32 src,sljit_sw srcw)289 SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_return(struct sljit_compiler *compiler, sljit_s32 op, sljit_s32 src, sljit_sw srcw)
290 {
291 sljit_s32 size;
292 sljit_u8 *inst;
293
294 CHECK_ERROR();
295 CHECK(check_sljit_emit_return(compiler, op, src, srcw));
296 SLJIT_ASSERT(compiler->args >= 0);
297
298 FAIL_IF(emit_mov_before_return(compiler, op, src, srcw));
299
300 SLJIT_ASSERT(compiler->local_size > 0);
301
302 #if !defined(__APPLE__)
303 if (compiler->options & SLJIT_F64_ALIGNMENT)
304 EMIT_MOV(compiler, SLJIT_SP, 0, SLJIT_MEM1(SLJIT_SP), compiler->local_size)
305 else
306 FAIL_IF(emit_cum_binary(compiler, BINARY_OPCODE(ADD),
307 SLJIT_SP, 0, SLJIT_SP, 0, SLJIT_IMM, compiler->local_size));
308 #else
309 FAIL_IF(emit_cum_binary(compiler, BINARY_OPCODE(ADD),
310 SLJIT_SP, 0, SLJIT_SP, 0, SLJIT_IMM, compiler->local_size));
311 #endif
312
313 size = 2 + (compiler->scratches > 9 ? (compiler->scratches - 9) : 0) +
314 (compiler->saveds <= 3 ? compiler->saveds : 3);
315 #if (defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL)
316 if (compiler->args > 2)
317 size += 2;
318 #endif
319 inst = (sljit_u8*)ensure_buf(compiler, 1 + size);
320 FAIL_IF(!inst);
321
322 INC_SIZE(size);
323
324 if (compiler->saveds > 0 || compiler->scratches > 11)
325 POP_REG(reg_map[SLJIT_S0]);
326 if (compiler->saveds > 1 || compiler->scratches > 10)
327 POP_REG(reg_map[SLJIT_S1]);
328 if (compiler->saveds > 2 || compiler->scratches > 9)
329 POP_REG(reg_map[SLJIT_S2]);
330 POP_REG(reg_map[TMP_REG1]);
331 #if (defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL)
332 if (compiler->args > 2)
333 RET_I16(sizeof(sljit_sw));
334 else
335 RET();
336 #else
337 RET();
338 #endif
339
340 return SLJIT_SUCCESS;
341 }
342
343 /* --------------------------------------------------------------------- */
344 /* Operators */
345 /* --------------------------------------------------------------------- */
346
347 /* 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)348 static sljit_u8* emit_x86_instruction(struct sljit_compiler *compiler, sljit_s32 size,
349 /* The register or immediate operand. */
350 sljit_s32 a, sljit_sw imma,
351 /* The general operand (not immediate). */
352 sljit_s32 b, sljit_sw immb)
353 {
354 sljit_u8 *inst;
355 sljit_u8 *buf_ptr;
356 sljit_s32 flags = size & ~0xf;
357 sljit_s32 inst_size;
358
359 /* Both cannot be switched on. */
360 SLJIT_ASSERT((flags & (EX86_BIN_INS | EX86_SHIFT_INS)) != (EX86_BIN_INS | EX86_SHIFT_INS));
361 /* Size flags not allowed for typed instructions. */
362 SLJIT_ASSERT(!(flags & (EX86_BIN_INS | EX86_SHIFT_INS)) || (flags & (EX86_BYTE_ARG | EX86_HALF_ARG)) == 0);
363 /* Both size flags cannot be switched on. */
364 SLJIT_ASSERT((flags & (EX86_BYTE_ARG | EX86_HALF_ARG)) != (EX86_BYTE_ARG | EX86_HALF_ARG));
365 /* SSE2 and immediate is not possible. */
366 SLJIT_ASSERT(!(a & SLJIT_IMM) || !(flags & EX86_SSE2));
367 SLJIT_ASSERT((flags & (EX86_PREF_F2 | EX86_PREF_F3)) != (EX86_PREF_F2 | EX86_PREF_F3)
368 && (flags & (EX86_PREF_F2 | EX86_PREF_66)) != (EX86_PREF_F2 | EX86_PREF_66)
369 && (flags & (EX86_PREF_F3 | EX86_PREF_66)) != (EX86_PREF_F3 | EX86_PREF_66));
370 /* We don't support (%ebp). */
371 SLJIT_ASSERT(!(b & SLJIT_MEM) || immb || reg_map[b & REG_MASK] != 5);
372
373 size &= 0xf;
374 inst_size = size;
375
376 if (flags & (EX86_PREF_F2 | EX86_PREF_F3))
377 inst_size++;
378 if (flags & EX86_PREF_66)
379 inst_size++;
380
381 /* Calculate size of b. */
382 inst_size += 1; /* mod r/m byte. */
383 if (b & SLJIT_MEM) {
384 if ((b & REG_MASK) == SLJIT_UNUSED)
385 inst_size += sizeof(sljit_sw);
386 else if (immb != 0 && !(b & OFFS_REG_MASK)) {
387 /* Immediate operand. */
388 if (immb <= 127 && immb >= -128)
389 inst_size += sizeof(sljit_s8);
390 else
391 inst_size += sizeof(sljit_sw);
392 }
393
394 if ((b & REG_MASK) == SLJIT_SP && !(b & OFFS_REG_MASK))
395 b |= TO_OFFS_REG(SLJIT_SP);
396
397 if ((b & OFFS_REG_MASK) != SLJIT_UNUSED)
398 inst_size += 1; /* SIB byte. */
399 }
400
401 /* Calculate size of a. */
402 if (a & SLJIT_IMM) {
403 if (flags & EX86_BIN_INS) {
404 if (imma <= 127 && imma >= -128) {
405 inst_size += 1;
406 flags |= EX86_BYTE_ARG;
407 } else
408 inst_size += 4;
409 }
410 else if (flags & EX86_SHIFT_INS) {
411 imma &= 0x1f;
412 if (imma != 1) {
413 inst_size ++;
414 flags |= EX86_BYTE_ARG;
415 }
416 } else if (flags & EX86_BYTE_ARG)
417 inst_size++;
418 else if (flags & EX86_HALF_ARG)
419 inst_size += sizeof(short);
420 else
421 inst_size += sizeof(sljit_sw);
422 }
423 else
424 SLJIT_ASSERT(!(flags & EX86_SHIFT_INS) || a == SLJIT_PREF_SHIFT_REG);
425
426 inst = (sljit_u8*)ensure_buf(compiler, 1 + inst_size);
427 PTR_FAIL_IF(!inst);
428
429 /* Encoding the byte. */
430 INC_SIZE(inst_size);
431 if (flags & EX86_PREF_F2)
432 *inst++ = 0xf2;
433 if (flags & EX86_PREF_F3)
434 *inst++ = 0xf3;
435 if (flags & EX86_PREF_66)
436 *inst++ = 0x66;
437
438 buf_ptr = inst + size;
439
440 /* Encode mod/rm byte. */
441 if (!(flags & EX86_SHIFT_INS)) {
442 if ((flags & EX86_BIN_INS) && (a & SLJIT_IMM))
443 *inst = (flags & EX86_BYTE_ARG) ? GROUP_BINARY_83 : GROUP_BINARY_81;
444
445 if (a & SLJIT_IMM)
446 *buf_ptr = 0;
447 else if (!(flags & EX86_SSE2_OP1))
448 *buf_ptr = reg_map[a] << 3;
449 else
450 *buf_ptr = a << 3;
451 }
452 else {
453 if (a & SLJIT_IMM) {
454 if (imma == 1)
455 *inst = GROUP_SHIFT_1;
456 else
457 *inst = GROUP_SHIFT_N;
458 } else
459 *inst = GROUP_SHIFT_CL;
460 *buf_ptr = 0;
461 }
462
463 if (!(b & SLJIT_MEM))
464 *buf_ptr++ |= MOD_REG + ((!(flags & EX86_SSE2_OP2)) ? reg_map[b] : b);
465 else if ((b & REG_MASK) != SLJIT_UNUSED) {
466 if ((b & OFFS_REG_MASK) == SLJIT_UNUSED || (b & OFFS_REG_MASK) == TO_OFFS_REG(SLJIT_SP)) {
467 if (immb != 0) {
468 if (immb <= 127 && immb >= -128)
469 *buf_ptr |= 0x40;
470 else
471 *buf_ptr |= 0x80;
472 }
473
474 if ((b & OFFS_REG_MASK) == SLJIT_UNUSED)
475 *buf_ptr++ |= reg_map[b & REG_MASK];
476 else {
477 *buf_ptr++ |= 0x04;
478 *buf_ptr++ = reg_map[b & REG_MASK] | (reg_map[OFFS_REG(b)] << 3);
479 }
480
481 if (immb != 0) {
482 if (immb <= 127 && immb >= -128)
483 *buf_ptr++ = immb; /* 8 bit displacement. */
484 else {
485 sljit_unaligned_store_sw(buf_ptr, immb); /* 32 bit displacement. */
486 buf_ptr += sizeof(sljit_sw);
487 }
488 }
489 }
490 else {
491 *buf_ptr++ |= 0x04;
492 *buf_ptr++ = reg_map[b & REG_MASK] | (reg_map[OFFS_REG(b)] << 3) | (immb << 6);
493 }
494 }
495 else {
496 *buf_ptr++ |= 0x05;
497 sljit_unaligned_store_sw(buf_ptr, immb); /* 32 bit displacement. */
498 buf_ptr += sizeof(sljit_sw);
499 }
500
501 if (a & SLJIT_IMM) {
502 if (flags & EX86_BYTE_ARG)
503 *buf_ptr = imma;
504 else if (flags & EX86_HALF_ARG)
505 sljit_unaligned_store_s16(buf_ptr, imma);
506 else if (!(flags & EX86_SHIFT_INS))
507 sljit_unaligned_store_sw(buf_ptr, imma);
508 }
509
510 return !(flags & EX86_SHIFT_INS) ? inst : (inst + 1);
511 }
512
513 /* --------------------------------------------------------------------- */
514 /* Call / return instructions */
515 /* --------------------------------------------------------------------- */
516
517 #if (defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL)
518
c_fast_call_get_stack_size(sljit_s32 arg_types,sljit_s32 * word_arg_count_ptr)519 static sljit_s32 c_fast_call_get_stack_size(sljit_s32 arg_types, sljit_s32 *word_arg_count_ptr)
520 {
521 sljit_s32 stack_size = 0;
522 sljit_s32 word_arg_count = 0;
523
524 arg_types >>= SLJIT_DEF_SHIFT;
525
526 while (arg_types) {
527 switch (arg_types & SLJIT_DEF_MASK) {
528 case SLJIT_ARG_TYPE_F32:
529 stack_size += sizeof(sljit_f32);
530 break;
531 case SLJIT_ARG_TYPE_F64:
532 stack_size += sizeof(sljit_f64);
533 break;
534 default:
535 word_arg_count++;
536 if (word_arg_count > 2)
537 stack_size += sizeof(sljit_sw);
538 break;
539 }
540
541 arg_types >>= SLJIT_DEF_SHIFT;
542 }
543
544 if (word_arg_count_ptr)
545 *word_arg_count_ptr = word_arg_count;
546
547 return stack_size;
548 }
549
c_fast_call_with_args(struct sljit_compiler * compiler,sljit_s32 arg_types,sljit_s32 stack_size,sljit_s32 word_arg_count,sljit_s32 swap_args)550 static sljit_s32 c_fast_call_with_args(struct sljit_compiler *compiler,
551 sljit_s32 arg_types, sljit_s32 stack_size, sljit_s32 word_arg_count, sljit_s32 swap_args)
552 {
553 sljit_u8 *inst;
554 sljit_s32 float_arg_count;
555
556 if (stack_size == sizeof(sljit_sw) && word_arg_count == 3) {
557 inst = (sljit_u8*)ensure_buf(compiler, 1 + 1);
558 FAIL_IF(!inst);
559 INC_SIZE(1);
560 PUSH_REG(reg_map[SLJIT_R2]);
561 }
562 else if (stack_size > 0) {
563 if (word_arg_count >= 4)
564 EMIT_MOV(compiler, TMP_REG1, 0, SLJIT_MEM1(SLJIT_SP), compiler->saveds_offset - sizeof(sljit_sw));
565
566 FAIL_IF(emit_non_cum_binary(compiler, BINARY_OPCODE(SUB),
567 SLJIT_SP, 0, SLJIT_SP, 0, SLJIT_IMM, stack_size));
568
569 stack_size = 0;
570 arg_types >>= SLJIT_DEF_SHIFT;
571 word_arg_count = 0;
572 float_arg_count = 0;
573 while (arg_types) {
574 switch (arg_types & SLJIT_DEF_MASK) {
575 case SLJIT_ARG_TYPE_F32:
576 float_arg_count++;
577 FAIL_IF(emit_sse2_store(compiler, 1, SLJIT_MEM1(SLJIT_SP), stack_size, float_arg_count));
578 stack_size += sizeof(sljit_f32);
579 break;
580 case SLJIT_ARG_TYPE_F64:
581 float_arg_count++;
582 FAIL_IF(emit_sse2_store(compiler, 0, SLJIT_MEM1(SLJIT_SP), stack_size, float_arg_count));
583 stack_size += sizeof(sljit_f64);
584 break;
585 default:
586 word_arg_count++;
587 if (word_arg_count == 3) {
588 EMIT_MOV(compiler, SLJIT_MEM1(SLJIT_SP), stack_size, SLJIT_R2, 0);
589 stack_size += sizeof(sljit_sw);
590 }
591 else if (word_arg_count == 4) {
592 EMIT_MOV(compiler, SLJIT_MEM1(SLJIT_SP), stack_size, TMP_REG1, 0);
593 stack_size += sizeof(sljit_sw);
594 }
595 break;
596 }
597
598 arg_types >>= SLJIT_DEF_SHIFT;
599 }
600 }
601
602 if (word_arg_count > 0) {
603 if (swap_args) {
604 inst = (sljit_u8*)ensure_buf(compiler, 1 + 1);
605 FAIL_IF(!inst);
606 INC_SIZE(1);
607
608 *inst++ = XCHG_EAX_r | reg_map[SLJIT_R2];
609 }
610 else {
611 inst = (sljit_u8*)ensure_buf(compiler, 1 + 2);
612 FAIL_IF(!inst);
613 INC_SIZE(2);
614
615 *inst++ = MOV_r_rm;
616 *inst++ = MOD_REG | (reg_map[SLJIT_R2] << 3) | reg_map[SLJIT_R0];
617 }
618 }
619
620 return SLJIT_SUCCESS;
621 }
622
623 #endif
624
cdecl_call_get_stack_size(struct sljit_compiler * compiler,sljit_s32 arg_types,sljit_s32 * word_arg_count_ptr)625 static sljit_s32 cdecl_call_get_stack_size(struct sljit_compiler *compiler, sljit_s32 arg_types, sljit_s32 *word_arg_count_ptr)
626 {
627 sljit_s32 stack_size = 0;
628 sljit_s32 word_arg_count = 0;
629
630 arg_types >>= SLJIT_DEF_SHIFT;
631
632 while (arg_types) {
633 switch (arg_types & SLJIT_DEF_MASK) {
634 case SLJIT_ARG_TYPE_F32:
635 stack_size += sizeof(sljit_f32);
636 break;
637 case SLJIT_ARG_TYPE_F64:
638 stack_size += sizeof(sljit_f64);
639 break;
640 default:
641 word_arg_count++;
642 stack_size += sizeof(sljit_sw);
643 break;
644 }
645
646 arg_types >>= SLJIT_DEF_SHIFT;
647 }
648
649 if (word_arg_count_ptr)
650 *word_arg_count_ptr = word_arg_count;
651
652 if (stack_size <= compiler->stack_tmp_size)
653 return 0;
654
655 #if defined(__APPLE__)
656 return ((stack_size - compiler->stack_tmp_size + 15) & ~15);
657 #else
658 return stack_size - compiler->stack_tmp_size;
659 #endif
660 }
661
cdecl_call_with_args(struct sljit_compiler * compiler,sljit_s32 arg_types,sljit_s32 stack_size,sljit_s32 word_arg_count)662 static sljit_s32 cdecl_call_with_args(struct sljit_compiler *compiler,
663 sljit_s32 arg_types, sljit_s32 stack_size, sljit_s32 word_arg_count)
664 {
665 sljit_s32 float_arg_count = 0;
666
667 if (word_arg_count >= 4)
668 EMIT_MOV(compiler, TMP_REG1, 0, SLJIT_MEM1(SLJIT_SP), compiler->saveds_offset - sizeof(sljit_sw));
669
670 if (stack_size > 0)
671 FAIL_IF(emit_non_cum_binary(compiler, BINARY_OPCODE(SUB),
672 SLJIT_SP, 0, SLJIT_SP, 0, SLJIT_IMM, stack_size));
673
674 stack_size = 0;
675 word_arg_count = 0;
676 arg_types >>= SLJIT_DEF_SHIFT;
677
678 while (arg_types) {
679 switch (arg_types & SLJIT_DEF_MASK) {
680 case SLJIT_ARG_TYPE_F32:
681 float_arg_count++;
682 FAIL_IF(emit_sse2_store(compiler, 1, SLJIT_MEM1(SLJIT_SP), stack_size, float_arg_count));
683 stack_size += sizeof(sljit_f32);
684 break;
685 case SLJIT_ARG_TYPE_F64:
686 float_arg_count++;
687 FAIL_IF(emit_sse2_store(compiler, 0, SLJIT_MEM1(SLJIT_SP), stack_size, float_arg_count));
688 stack_size += sizeof(sljit_f64);
689 break;
690 default:
691 word_arg_count++;
692 EMIT_MOV(compiler, SLJIT_MEM1(SLJIT_SP), stack_size, (word_arg_count >= 4) ? TMP_REG1 : word_arg_count, 0);
693 stack_size += sizeof(sljit_sw);
694 break;
695 }
696
697 arg_types >>= SLJIT_DEF_SHIFT;
698 }
699
700 return SLJIT_SUCCESS;
701 }
702
post_call_with_args(struct sljit_compiler * compiler,sljit_s32 arg_types,sljit_s32 stack_size)703 static sljit_s32 post_call_with_args(struct sljit_compiler *compiler,
704 sljit_s32 arg_types, sljit_s32 stack_size)
705 {
706 sljit_u8 *inst;
707 sljit_s32 single;
708
709 if (stack_size > 0)
710 FAIL_IF(emit_cum_binary(compiler, BINARY_OPCODE(ADD),
711 SLJIT_SP, 0, SLJIT_SP, 0, SLJIT_IMM, stack_size));
712
713 if ((arg_types & SLJIT_DEF_MASK) < SLJIT_ARG_TYPE_F32)
714 return SLJIT_SUCCESS;
715
716 single = ((arg_types & SLJIT_DEF_MASK) == SLJIT_ARG_TYPE_F32);
717
718 inst = (sljit_u8*)ensure_buf(compiler, 1 + 3);
719 FAIL_IF(!inst);
720 INC_SIZE(3);
721 inst[0] = single ? FSTPS : FSTPD;
722 inst[1] = (0x03 << 3) | 0x04;
723 inst[2] = (0x04 << 3) | reg_map[SLJIT_SP];
724
725 return emit_sse2_load(compiler, single, SLJIT_FR0, SLJIT_MEM1(SLJIT_SP), 0);
726 }
727
sljit_emit_call(struct sljit_compiler * compiler,sljit_s32 type,sljit_s32 arg_types)728 SLJIT_API_FUNC_ATTRIBUTE struct sljit_jump* sljit_emit_call(struct sljit_compiler *compiler, sljit_s32 type,
729 sljit_s32 arg_types)
730 {
731 struct sljit_jump *jump;
732 sljit_s32 stack_size = 0;
733 sljit_s32 word_arg_count;
734
735 CHECK_ERROR_PTR();
736 CHECK_PTR(check_sljit_emit_call(compiler, type, arg_types));
737
738 #if (defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL)
739 if ((type & 0xff) == SLJIT_CALL) {
740 stack_size = c_fast_call_get_stack_size(arg_types, &word_arg_count);
741 PTR_FAIL_IF(c_fast_call_with_args(compiler, arg_types, stack_size, word_arg_count, 0));
742
743 #if (defined SLJIT_VERBOSE && SLJIT_VERBOSE) \
744 || (defined SLJIT_ARGUMENT_CHECKS && SLJIT_ARGUMENT_CHECKS)
745 compiler->skip_checks = 1;
746 #endif
747
748 jump = sljit_emit_jump(compiler, type);
749 PTR_FAIL_IF(jump == NULL);
750
751 PTR_FAIL_IF(post_call_with_args(compiler, arg_types, 0));
752 return jump;
753 }
754 #endif
755
756 stack_size = cdecl_call_get_stack_size(compiler, arg_types, &word_arg_count);
757 PTR_FAIL_IF(cdecl_call_with_args(compiler, arg_types, stack_size, word_arg_count));
758
759 #if (defined SLJIT_VERBOSE && SLJIT_VERBOSE) \
760 || (defined SLJIT_ARGUMENT_CHECKS && SLJIT_ARGUMENT_CHECKS)
761 compiler->skip_checks = 1;
762 #endif
763
764 jump = sljit_emit_jump(compiler, type);
765 PTR_FAIL_IF(jump == NULL);
766
767 PTR_FAIL_IF(post_call_with_args(compiler, arg_types, stack_size));
768 return jump;
769 }
770
sljit_emit_icall(struct sljit_compiler * compiler,sljit_s32 type,sljit_s32 arg_types,sljit_s32 src,sljit_sw srcw)771 SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_icall(struct sljit_compiler *compiler, sljit_s32 type,
772 sljit_s32 arg_types,
773 sljit_s32 src, sljit_sw srcw)
774 {
775 sljit_s32 stack_size = 0;
776 sljit_s32 word_arg_count;
777 #if (defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL)
778 sljit_s32 swap_args;
779 #endif
780
781 CHECK_ERROR();
782 CHECK(check_sljit_emit_icall(compiler, type, arg_types, src, srcw));
783
784 #if (defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL)
785 SLJIT_ASSERT(reg_map[SLJIT_R0] == 0 && reg_map[SLJIT_R2] == 1 && SLJIT_R0 == 1 && SLJIT_R2 == 3);
786
787 if ((type & 0xff) == SLJIT_CALL) {
788 stack_size = c_fast_call_get_stack_size(arg_types, &word_arg_count);
789 swap_args = 0;
790
791 if (word_arg_count > 0) {
792 if ((src & REG_MASK) == SLJIT_R2 || OFFS_REG(src) == SLJIT_R2) {
793 swap_args = 1;
794 if (((src & REG_MASK) | 0x2) == SLJIT_R2)
795 src ^= 0x2;
796 if ((OFFS_REG(src) | 0x2) == SLJIT_R2)
797 src ^= TO_OFFS_REG(0x2);
798 }
799 }
800
801 FAIL_IF(c_fast_call_with_args(compiler, arg_types, stack_size, word_arg_count, swap_args));
802
803 compiler->saveds_offset += stack_size;
804 compiler->locals_offset += stack_size;
805
806 #if (defined SLJIT_VERBOSE && SLJIT_VERBOSE) \
807 || (defined SLJIT_ARGUMENT_CHECKS && SLJIT_ARGUMENT_CHECKS)
808 compiler->skip_checks = 1;
809 #endif
810 FAIL_IF(sljit_emit_ijump(compiler, type, src, srcw));
811
812 compiler->saveds_offset -= stack_size;
813 compiler->locals_offset -= stack_size;
814
815 return post_call_with_args(compiler, arg_types, 0);
816 }
817 #endif
818
819 stack_size = cdecl_call_get_stack_size(compiler, arg_types, &word_arg_count);
820 FAIL_IF(cdecl_call_with_args(compiler, arg_types, stack_size, word_arg_count));
821
822 compiler->saveds_offset += stack_size;
823 compiler->locals_offset += stack_size;
824
825 #if (defined SLJIT_VERBOSE && SLJIT_VERBOSE) \
826 || (defined SLJIT_ARGUMENT_CHECKS && SLJIT_ARGUMENT_CHECKS)
827 compiler->skip_checks = 1;
828 #endif
829 FAIL_IF(sljit_emit_ijump(compiler, type, src, srcw));
830
831 compiler->saveds_offset -= stack_size;
832 compiler->locals_offset -= stack_size;
833
834 return post_call_with_args(compiler, arg_types, stack_size);
835 }
836
sljit_emit_fast_enter(struct sljit_compiler * compiler,sljit_s32 dst,sljit_sw dstw)837 SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_fast_enter(struct sljit_compiler *compiler, sljit_s32 dst, sljit_sw dstw)
838 {
839 sljit_u8 *inst;
840
841 CHECK_ERROR();
842 CHECK(check_sljit_emit_fast_enter(compiler, dst, dstw));
843 ADJUST_LOCAL_OFFSET(dst, dstw);
844
845 CHECK_EXTRA_REGS(dst, dstw, (void)0);
846
847 /* For UNUSED dst. Uncommon, but possible. */
848 if (dst == SLJIT_UNUSED)
849 dst = TMP_REG1;
850
851 if (FAST_IS_REG(dst)) {
852 /* Unused dest is possible here. */
853 inst = (sljit_u8*)ensure_buf(compiler, 1 + 1);
854 FAIL_IF(!inst);
855
856 INC_SIZE(1);
857 POP_REG(reg_map[dst]);
858 return SLJIT_SUCCESS;
859 }
860
861 /* Memory. */
862 inst = emit_x86_instruction(compiler, 1, 0, 0, dst, dstw);
863 FAIL_IF(!inst);
864 *inst++ = POP_rm;
865 return SLJIT_SUCCESS;
866 }
867
emit_fast_return(struct sljit_compiler * compiler,sljit_s32 src,sljit_sw srcw)868 static sljit_s32 emit_fast_return(struct sljit_compiler *compiler, sljit_s32 src, sljit_sw srcw)
869 {
870 sljit_u8 *inst;
871
872 CHECK_EXTRA_REGS(src, srcw, (void)0);
873
874 if (FAST_IS_REG(src)) {
875 inst = (sljit_u8*)ensure_buf(compiler, 1 + 1 + 1);
876 FAIL_IF(!inst);
877
878 INC_SIZE(1 + 1);
879 PUSH_REG(reg_map[src]);
880 }
881 else {
882 inst = emit_x86_instruction(compiler, 1, 0, 0, src, srcw);
883 FAIL_IF(!inst);
884 *inst++ = GROUP_FF;
885 *inst |= PUSH_rm;
886
887 inst = (sljit_u8*)ensure_buf(compiler, 1 + 1);
888 FAIL_IF(!inst);
889 INC_SIZE(1);
890 }
891
892 RET();
893 return SLJIT_SUCCESS;
894 }
895
skip_frames_before_return(struct sljit_compiler * compiler)896 static sljit_s32 skip_frames_before_return(struct sljit_compiler *compiler)
897 {
898 sljit_s32 size, saved_size;
899 sljit_s32 has_f64_aligment;
900
901 /* Don't adjust shadow stack if it isn't enabled. */
902 if (!cpu_has_shadow_stack ())
903 return SLJIT_SUCCESS;
904
905 SLJIT_ASSERT(compiler->args >= 0);
906 SLJIT_ASSERT(compiler->local_size > 0);
907
908 #if !defined(__APPLE__)
909 has_f64_aligment = compiler->options & SLJIT_F64_ALIGNMENT;
910 #else
911 has_f64_aligment = 0;
912 #endif
913
914 size = compiler->local_size;
915 saved_size = (1 + (compiler->scratches > 9 ? (compiler->scratches - 9) : 0) + (compiler->saveds <= 3 ? compiler->saveds : 3)) * sizeof(sljit_uw);
916 if (has_f64_aligment) {
917 /* mov TMP_REG1, [esp + local_size]. */
918 EMIT_MOV(compiler, TMP_REG1, 0, SLJIT_MEM1(SLJIT_SP), size);
919 /* mov TMP_REG1, [TMP_REG1+ saved_size]. */
920 EMIT_MOV(compiler, TMP_REG1, 0, SLJIT_MEM1(TMP_REG1), saved_size);
921 /* Move return address to [esp]. */
922 EMIT_MOV(compiler, SLJIT_MEM1(SLJIT_SP), 0, TMP_REG1, 0);
923 size = 0;
924 } else
925 size += saved_size;
926
927 return adjust_shadow_stack(compiler, SLJIT_UNUSED, 0, SLJIT_SP, size);
928 }
929
