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Member "pcre-8.42/sljit/sljitNativeX86_32.c" (13 Mar 2018, 26592 Bytes) of package /linux/misc/pcre-8.42.tar.bz2:


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    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 
   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 
   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 
   66 SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_enter(struct sljit_compiler *compiler,
   67     sljit_s32 options, sljit_s32 arg_types, sljit_s32 scratches, sljit_s32 saveds,
   68     sljit_s32 fscratches, sljit_s32 fsaveds, sljit_s32 local_size)
   69 {
   70     sljit_s32 args, size;
   71     sljit_u8 *inst;
   72 
   73     CHECK_ERROR();
   74     CHECK(check_sljit_emit_enter(compiler, options, arg_types, scratches, saveds, fscratches, fsaveds, local_size));
   75     set_emit_enter(compiler, options, arg_types, scratches, saveds, fscratches, fsaveds, local_size);
   76 
   77     args = get_arg_count(arg_types);
   78     compiler->args = args;
   79 
   80     /* [esp+0] for saving temporaries and function calls. */
   81     compiler->stack_tmp_size = 2 * sizeof(sljit_sw);
   82 
   83 #if !(defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL)
   84     if (scratches > 3)
   85         compiler->stack_tmp_size = 3 * sizeof(sljit_sw);
   86 #endif
   87 
   88     compiler->saveds_offset = compiler->stack_tmp_size;
   89     if (scratches > 3)
   90         compiler->saveds_offset += ((scratches > (3 + 6)) ? 6 : (scratches - 3)) * sizeof(sljit_sw);
   91 
   92     compiler->locals_offset = compiler->saveds_offset;
   93 
   94     if (saveds > 3)
   95         compiler->locals_offset += (saveds - 3) * sizeof(sljit_sw);
   96 
   97     if (options & SLJIT_F64_ALIGNMENT)
   98         compiler->locals_offset = (compiler->locals_offset + sizeof(sljit_f64) - 1) & ~(sizeof(sljit_f64) - 1);
   99 
  100     size = 1 + (scratches > 9 ? (scratches - 9) : 0) + (saveds <= 3 ? saveds : 3);
  101 #if (defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL)
  102     size += (args > 0 ? (args * 2) : 0) + (args > 2 ? 2 : 0);
  103 #else
  104     size += (args > 0 ? (2 + args * 3) : 0);
  105 #endif
  106     inst = (sljit_u8*)ensure_buf(compiler, 1 + size);
  107     FAIL_IF(!inst);
  108 
  109     INC_SIZE(size);
  110     PUSH_REG(reg_map[TMP_REG1]);
  111 #if !(defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL)
  112     if (args > 0) {
  113         *inst++ = MOV_r_rm;
  114         *inst++ = MOD_REG | (reg_map[TMP_REG1] << 3) | 0x4 /* esp */;
  115     }
  116 #endif
  117     if (saveds > 2 || scratches > 9)
  118         PUSH_REG(reg_map[SLJIT_S2]);
  119     if (saveds > 1 || scratches > 10)
  120         PUSH_REG(reg_map[SLJIT_S1]);
  121     if (saveds > 0 || scratches > 11)
  122         PUSH_REG(reg_map[SLJIT_S0]);
  123 
  124 #if (defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL)
  125     if (args > 0) {
  126         inst[0] = MOV_r_rm;
  127         inst[1] = MOD_REG | (reg_map[SLJIT_S0] << 3) | reg_map[SLJIT_R2];
  128         inst += 2;
  129     }
  130     if (args > 1) {
  131         inst[0] = MOV_r_rm;
  132         inst[1] = MOD_REG | (reg_map[SLJIT_S1] << 3) | reg_map[SLJIT_R1];
  133         inst += 2;
  134     }
  135     if (args > 2) {
  136         inst[0] = MOV_r_rm;
  137         inst[1] = MOD_DISP8 | (reg_map[SLJIT_S2] << 3) | 0x4 /* esp */;
  138         inst[2] = 0x24;
  139         inst[3] = sizeof(sljit_sw) * (3 + 2); /* saveds >= 3 as well. */
  140     }
  141 #else
  142     if (args > 0) {
  143         inst[0] = MOV_r_rm;
  144         inst[1] = MOD_DISP8 | (reg_map[SLJIT_S0] << 3) | reg_map[TMP_REG1];
  145         inst[2] = sizeof(sljit_sw) * 2;
  146         inst += 3;
  147     }
  148     if (args > 1) {
  149         inst[0] = MOV_r_rm;
  150         inst[1] = MOD_DISP8 | (reg_map[SLJIT_S1] << 3) | reg_map[TMP_REG1];
  151         inst[2] = sizeof(sljit_sw) * 3;
  152         inst += 3;
  153     }
  154     if (args > 2) {
  155         inst[0] = MOV_r_rm;
  156         inst[1] = MOD_DISP8 | (reg_map[SLJIT_S2] << 3) | reg_map[TMP_REG1];
  157         inst[2] = sizeof(sljit_sw) * 4;
  158     }
  159 #endif
  160 
  161     SLJIT_ASSERT(SLJIT_LOCALS_OFFSET > 0);
  162 
  163 #if defined(__APPLE__)
  164     /* Ignore pushed registers and SLJIT_LOCALS_OFFSET when computing the aligned local size. */
  165     saveds = (2 + (scratches > 9 ? (scratches - 9) : 0) + (saveds <= 3 ? saveds : 3)) * sizeof(sljit_uw);
  166     local_size = ((SLJIT_LOCALS_OFFSET + saveds + local_size + 15) & ~15) - saveds;
  167 #else
  168     if (options & SLJIT_F64_ALIGNMENT)
  169         local_size = SLJIT_LOCALS_OFFSET + ((local_size + sizeof(sljit_f64) - 1) & ~(sizeof(sljit_f64) - 1));
  170     else
  171         local_size = SLJIT_LOCALS_OFFSET + ((local_size + sizeof(sljit_sw) - 1) & ~(sizeof(sljit_sw) - 1));
  172 #endif
  173 
  174     compiler->local_size = local_size;
  175 
  176 #ifdef _WIN32
  177     if (local_size > 0) {
  178         if (local_size <= 4 * 4096) {
  179             if (local_size > 4096)
  180                 EMIT_MOV(compiler, TMP_REG1, 0, SLJIT_MEM1(SLJIT_SP), -4096);
  181             if (local_size > 2 * 4096)
  182                 EMIT_MOV(compiler, TMP_REG1, 0, SLJIT_MEM1(SLJIT_SP), -4096 * 2);
  183             if (local_size > 3 * 4096)
  184                 EMIT_MOV(compiler, TMP_REG1, 0, SLJIT_MEM1(SLJIT_SP), -4096 * 3);
  185         }
  186         else {
  187             EMIT_MOV(compiler, SLJIT_R0, 0, SLJIT_SP, 0);
  188             EMIT_MOV(compiler, SLJIT_R1, 0, SLJIT_IMM, (local_size - 1) >> 12);
  189 
  190             SLJIT_ASSERT (reg_map[SLJIT_R0] == 0);
  191 
  192             EMIT_MOV(compiler, TMP_REG1, 0, SLJIT_MEM1(SLJIT_R0), -4096);
  193             FAIL_IF(emit_non_cum_binary(compiler, BINARY_OPCODE(SUB),
  194                 SLJIT_R0, 0, SLJIT_R0, 0, SLJIT_IMM, 4096));
  195             FAIL_IF(emit_non_cum_binary(compiler, BINARY_OPCODE(SUB),
  196                 SLJIT_R1, 0, SLJIT_R1, 0, SLJIT_IMM, 1));
  197 
  198             inst = (sljit_u8*)ensure_buf(compiler, 1 + 2);
  199             FAIL_IF(!inst);
  200 
  201             INC_SIZE(2);
  202             inst[0] = JNE_i8;
  203             inst[1] = (sljit_s8) -16;
  204         }
  205 
  206         EMIT_MOV(compiler, TMP_REG1, 0, SLJIT_MEM1(SLJIT_SP), -local_size);
  207     }
  208 #endif
  209 
  210     SLJIT_ASSERT(local_size > 0);
  211 
  212 #if !defined(__APPLE__)
  213     if (options & SLJIT_F64_ALIGNMENT) {
  214         EMIT_MOV(compiler, TMP_REG1, 0, SLJIT_SP, 0);
  215 
  216         /* Some space might allocated during sljit_grow_stack() above on WIN32. */
  217         FAIL_IF(emit_non_cum_binary(compiler, BINARY_OPCODE(SUB),
  218             SLJIT_SP, 0, SLJIT_SP, 0, SLJIT_IMM, local_size + sizeof(sljit_sw)));
  219 
  220 #if defined _WIN32 && !(defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL)
  221         if (compiler->local_size > 1024)
  222             FAIL_IF(emit_cum_binary(compiler, BINARY_OPCODE(ADD),
  223                 TMP_REG1, 0, TMP_REG1, 0, SLJIT_IMM, sizeof(sljit_sw)));
  224 #endif
  225 
  226         inst = (sljit_u8*)ensure_buf(compiler, 1 + 6);
  227         FAIL_IF(!inst);
  228 
  229         INC_SIZE(6);
  230         inst[0] = GROUP_BINARY_81;
  231         inst[1] = MOD_REG | AND | reg_map[SLJIT_SP];
  232         sljit_unaligned_store_sw(inst + 2, ~(sizeof(sljit_f64) - 1));
  233 
  234         /* The real local size must be used. */
  235         return emit_mov(compiler, SLJIT_MEM1(SLJIT_SP), compiler->local_size, TMP_REG1, 0);
  236     }
  237 #endif
  238     return emit_non_cum_binary(compiler, BINARY_OPCODE(SUB),
  239         SLJIT_SP, 0, SLJIT_SP, 0, SLJIT_IMM, local_size);
  240 }
  241 
  242 SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_set_context(struct sljit_compiler *compiler,
  243     sljit_s32 options, sljit_s32 arg_types, sljit_s32 scratches, sljit_s32 saveds,
  244     sljit_s32 fscratches, sljit_s32 fsaveds, sljit_s32 local_size)
  245 {
  246     CHECK_ERROR();
  247     CHECK(check_sljit_set_context(compiler, options, arg_types, scratches, saveds, fscratches, fsaveds, local_size));
  248     set_set_context(compiler, options, arg_types, scratches, saveds, fscratches, fsaveds, local_size);
  249 
  250     compiler->args = get_arg_count(arg_types);
  251 
  252     /* [esp+0] for saving temporaries and function calls. */
  253     compiler->stack_tmp_size = 2 * sizeof(sljit_sw);
  254 
  255 #if !(defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL)
  256     if (scratches > 3)
  257         compiler->stack_tmp_size = 3 * sizeof(sljit_sw);
  258 #endif
  259 
  260     compiler->saveds_offset = compiler->stack_tmp_size;
  261     if (scratches > 3)
  262         compiler->saveds_offset += ((scratches > (3 + 6)) ? 6 : (scratches - 3)) * sizeof(sljit_sw);
  263 
  264     compiler->locals_offset = compiler->saveds_offset;
  265 
  266     if (saveds > 3)
  267         compiler->locals_offset += (saveds - 3) * sizeof(sljit_sw);
  268 
  269     if (options & SLJIT_F64_ALIGNMENT)
  270         compiler->locals_offset = (compiler->locals_offset + sizeof(sljit_f64) - 1) & ~(sizeof(sljit_f64) - 1);
  271 
  272 #if defined(__APPLE__)
  273     saveds = (2 + (scratches > 9 ? (scratches - 9) : 0) + (saveds <= 3 ? saveds : 3)) * sizeof(sljit_uw);
  274     compiler->local_size = ((SLJIT_LOCALS_OFFSET + saveds + local_size + 15) & ~15) - saveds;
  275 #else
  276     if (options & SLJIT_F64_ALIGNMENT)
  277         compiler->local_size = SLJIT_LOCALS_OFFSET + ((local_size + sizeof(sljit_f64) - 1) & ~(sizeof(sljit_f64) - 1));
  278     else
  279         compiler->local_size = SLJIT_LOCALS_OFFSET + ((local_size + sizeof(sljit_sw) - 1) & ~(sizeof(sljit_sw) - 1));
  280 #endif
  281     return SLJIT_SUCCESS;
  282 }
  283 
  284 SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_return(struct sljit_compiler *compiler, sljit_s32 op, sljit_s32 src, sljit_sw srcw)
  285 {
  286     sljit_s32 size;
  287     sljit_u8 *inst;
  288 
  289     CHECK_ERROR();
  290     CHECK(check_sljit_emit_return(compiler, op, src, srcw));
  291     SLJIT_ASSERT(compiler->args >= 0);
  292 
  293     FAIL_IF(emit_mov_before_return(compiler, op, src, srcw));
  294 
  295     SLJIT_ASSERT(compiler->local_size > 0);
  296 
  297 #if !defined(__APPLE__)
  298     if (compiler->options & SLJIT_F64_ALIGNMENT)
  299         EMIT_MOV(compiler, SLJIT_SP, 0, SLJIT_MEM1(SLJIT_SP), compiler->local_size)
  300     else
  301         FAIL_IF(emit_cum_binary(compiler, BINARY_OPCODE(ADD),
  302             SLJIT_SP, 0, SLJIT_SP, 0, SLJIT_IMM, compiler->local_size));
  303 #else
  304     FAIL_IF(emit_cum_binary(compiler, BINARY_OPCODE(ADD),
  305         SLJIT_SP, 0, SLJIT_SP, 0, SLJIT_IMM, compiler->local_size));
  306 #endif
  307 
  308     size = 2 + (compiler->scratches > 7 ? (compiler->scratches - 7) : 0) +
  309         (compiler->saveds <= 3 ? compiler->saveds : 3);
  310 #if (defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL)
  311     if (compiler->args > 2)
  312         size += 2;
  313 #else
  314     if (compiler->args > 0)
  315         size += 2;
  316 #endif
  317     inst = (sljit_u8*)ensure_buf(compiler, 1 + size);
  318     FAIL_IF(!inst);
  319 
  320     INC_SIZE(size);
  321 
  322     if (compiler->saveds > 0 || compiler->scratches > 11)
  323         POP_REG(reg_map[SLJIT_S0]);
  324     if (compiler->saveds > 1 || compiler->scratches > 10)
  325         POP_REG(reg_map[SLJIT_S1]);
  326     if (compiler->saveds > 2 || compiler->scratches > 9)
  327         POP_REG(reg_map[SLJIT_S2]);
  328     POP_REG(reg_map[TMP_REG1]);
  329 #if (defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL)
  330     if (compiler->args > 2)
  331         RET_I16(sizeof(sljit_sw));
  332     else
  333         RET();
  334 #else
  335     RET();
  336 #endif
  337 
  338     return SLJIT_SUCCESS;
  339 }
  340 
  341 /* --------------------------------------------------------------------- */
  342 /*  Operators                                                            */
  343 /* --------------------------------------------------------------------- */
  344 
  345 /* Size contains the flags as well. */
  346 static sljit_u8* emit_x86_instruction(struct sljit_compiler *compiler, sljit_s32 size,
  347     /* The register or immediate operand. */
  348     sljit_s32 a, sljit_sw imma,
  349     /* The general operand (not immediate). */
  350     sljit_s32 b, sljit_sw immb)
  351 {
  352     sljit_u8 *inst;
  353     sljit_u8 *buf_ptr;
  354     sljit_s32 flags = size & ~0xf;
  355     sljit_s32 inst_size;
  356 
  357     /* Both cannot be switched on. */
  358     SLJIT_ASSERT((flags & (EX86_BIN_INS | EX86_SHIFT_INS)) != (EX86_BIN_INS | EX86_SHIFT_INS));
  359     /* Size flags not allowed for typed instructions. */
  360     SLJIT_ASSERT(!(flags & (EX86_BIN_INS | EX86_SHIFT_INS)) || (flags & (EX86_BYTE_ARG | EX86_HALF_ARG)) == 0);
  361     /* Both size flags cannot be switched on. */
  362     SLJIT_ASSERT((flags & (EX86_BYTE_ARG | EX86_HALF_ARG)) != (EX86_BYTE_ARG | EX86_HALF_ARG));
  363     /* SSE2 and immediate is not possible. */
  364     SLJIT_ASSERT(!(a & SLJIT_IMM) || !(flags & EX86_SSE2));
  365     SLJIT_ASSERT((flags & (EX86_PREF_F2 | EX86_PREF_F3)) != (EX86_PREF_F2 | EX86_PREF_F3)
  366         && (flags & (EX86_PREF_F2 | EX86_PREF_66)) != (EX86_PREF_F2 | EX86_PREF_66)
  367         && (flags & (EX86_PREF_F3 | EX86_PREF_66)) != (EX86_PREF_F3 | EX86_PREF_66));
  368 
  369     size &= 0xf;
  370     inst_size = size;
  371 
  372     if (flags & (EX86_PREF_F2 | EX86_PREF_F3))
  373         inst_size++;
  374     if (flags & EX86_PREF_66)
  375         inst_size++;
  376 
  377     /* Calculate size of b. */
  378     inst_size += 1; /* mod r/m byte. */
  379     if (b & SLJIT_MEM) {
  380         if ((b & REG_MASK) == SLJIT_UNUSED)
  381             inst_size += sizeof(sljit_sw);
  382         else if (immb != 0 && !(b & OFFS_REG_MASK)) {
  383             /* Immediate operand. */
  384             if (immb <= 127 && immb >= -128)
  385                 inst_size += sizeof(sljit_s8);
  386             else
  387                 inst_size += sizeof(sljit_sw);
  388         }
  389 
  390         if ((b & REG_MASK) == SLJIT_SP && !(b & OFFS_REG_MASK))
  391             b |= TO_OFFS_REG(SLJIT_SP);
  392 
  393         if ((b & OFFS_REG_MASK) != SLJIT_UNUSED)
  394             inst_size += 1; /* SIB byte. */
  395     }
  396 
  397     /* Calculate size of a. */
  398     if (a & SLJIT_IMM) {
  399         if (flags & EX86_BIN_INS) {
  400             if (imma <= 127 && imma >= -128) {
  401                 inst_size += 1;
  402                 flags |= EX86_BYTE_ARG;
  403             } else
  404                 inst_size += 4;
  405         }
  406         else if (flags & EX86_SHIFT_INS) {
  407             imma &= 0x1f;
  408             if (imma != 1) {
  409                 inst_size ++;
  410                 flags |= EX86_BYTE_ARG;
  411             }
  412         } else if (flags & EX86_BYTE_ARG)
  413             inst_size++;
  414         else if (flags & EX86_HALF_ARG)
  415             inst_size += sizeof(short);
  416         else
  417             inst_size += sizeof(sljit_sw);
  418     }
  419     else
  420         SLJIT_ASSERT(!(flags & EX86_SHIFT_INS) || a == SLJIT_PREF_SHIFT_REG);
  421 
  422     inst = (sljit_u8*)ensure_buf(compiler, 1 + inst_size);
  423     PTR_FAIL_IF(!inst);
  424 
  425     /* Encoding the byte. */
  426     INC_SIZE(inst_size);
  427     if (flags & EX86_PREF_F2)
  428         *inst++ = 0xf2;
  429     if (flags & EX86_PREF_F3)
  430         *inst++ = 0xf3;
  431     if (flags & EX86_PREF_66)
  432         *inst++ = 0x66;
  433 
  434     buf_ptr = inst + size;
  435 
  436     /* Encode mod/rm byte. */
  437     if (!(flags & EX86_SHIFT_INS)) {
  438         if ((flags & EX86_BIN_INS) && (a & SLJIT_IMM))
  439             *inst = (flags & EX86_BYTE_ARG) ? GROUP_BINARY_83 : GROUP_BINARY_81;
  440 
  441         if (a & SLJIT_IMM)
  442             *buf_ptr = 0;
  443         else if (!(flags & EX86_SSE2_OP1))
  444             *buf_ptr = reg_map[a] << 3;
  445         else
  446             *buf_ptr = a << 3;
  447     }
  448     else {
  449         if (a & SLJIT_IMM) {
  450             if (imma == 1)
  451                 *inst = GROUP_SHIFT_1;
  452             else
  453                 *inst = GROUP_SHIFT_N;
  454         } else
  455             *inst = GROUP_SHIFT_CL;
  456         *buf_ptr = 0;
  457     }
  458 
  459     if (!(b & SLJIT_MEM))
  460         *buf_ptr++ |= MOD_REG + ((!(flags & EX86_SSE2_OP2)) ? reg_map[b] : b);
  461     else if ((b & REG_MASK) != SLJIT_UNUSED) {
  462         if ((b & OFFS_REG_MASK) == SLJIT_UNUSED || (b & OFFS_REG_MASK) == TO_OFFS_REG(SLJIT_SP)) {
  463             if (immb != 0) {
  464                 if (immb <= 127 && immb >= -128)
  465                     *buf_ptr |= 0x40;
  466                 else
  467                     *buf_ptr |= 0x80;
  468             }
  469 
  470             if ((b & OFFS_REG_MASK) == SLJIT_UNUSED)
  471                 *buf_ptr++ |= reg_map[b & REG_MASK];
  472             else {
  473                 *buf_ptr++ |= 0x04;
  474                 *buf_ptr++ = reg_map[b & REG_MASK] | (reg_map[OFFS_REG(b)] << 3);
  475             }
  476 
  477             if (immb != 0) {
  478                 if (immb <= 127 && immb >= -128)
  479                     *buf_ptr++ = immb; /* 8 bit displacement. */
  480                 else {
  481                     sljit_unaligned_store_sw(buf_ptr, immb); /* 32 bit displacement. */
  482                     buf_ptr += sizeof(sljit_sw);
  483                 }
  484             }
  485         }
  486         else {
  487             *buf_ptr++ |= 0x04;
  488             *buf_ptr++ = reg_map[b & REG_MASK] | (reg_map[OFFS_REG(b)] << 3) | (immb << 6);
  489         }
  490     }
  491     else {
  492         *buf_ptr++ |= 0x05;
  493         sljit_unaligned_store_sw(buf_ptr, immb); /* 32 bit displacement. */
  494         buf_ptr += sizeof(sljit_sw);
  495     }
  496 
  497     if (a & SLJIT_IMM) {
  498         if (flags & EX86_BYTE_ARG)
  499             *buf_ptr = imma;
  500         else if (flags & EX86_HALF_ARG)
  501             sljit_unaligned_store_s16(buf_ptr, imma);
  502         else if (!(flags & EX86_SHIFT_INS))
  503             sljit_unaligned_store_sw(buf_ptr, imma);
  504     }
  505 
  506     return !(flags & EX86_SHIFT_INS) ? inst : (inst + 1);
  507 }
  508 
  509 /* --------------------------------------------------------------------- */
  510 /*  Call / return instructions                                           */
  511 /* --------------------------------------------------------------------- */
  512 
  513 #if (defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL)
  514 
  515 static sljit_s32 c_fast_call_get_stack_size(sljit_s32 arg_types, sljit_s32 *word_arg_count_ptr)
  516 {
  517     sljit_s32 stack_size = 0;
  518     sljit_s32 word_arg_count = 0;
  519 
  520     arg_types >>= SLJIT_DEF_SHIFT;
  521 
  522     while (arg_types) {
  523         switch (arg_types & SLJIT_DEF_MASK) {
  524         case SLJIT_ARG_TYPE_F32:
  525             stack_size += sizeof(sljit_f32);
  526             break;
  527         case SLJIT_ARG_TYPE_F64:
  528             stack_size += sizeof(sljit_f64);
  529             break;
  530         default:
  531             word_arg_count++;
  532             if (word_arg_count > 2)
  533                 stack_size += sizeof(sljit_sw);
  534             break;
  535         }
  536 
  537         arg_types >>= SLJIT_DEF_SHIFT;
  538     }
  539 
  540     if (word_arg_count_ptr)
  541         *word_arg_count_ptr = word_arg_count;
  542 
  543     return stack_size;
  544 }
  545 
  546 static sljit_s32 c_fast_call_with_args(struct sljit_compiler *compiler,
  547     sljit_s32 arg_types, sljit_s32 stack_size, sljit_s32 word_arg_count, sljit_s32 swap_args)
  548 {
  549     sljit_u8 *inst;
  550     sljit_s32 float_arg_count;
  551 
  552     if (stack_size == sizeof(sljit_sw) && word_arg_count == 3) {
  553         inst = (sljit_u8*)ensure_buf(compiler, 1 + 1);
  554         FAIL_IF(!inst);
  555         INC_SIZE(1);
  556         PUSH_REG(reg_map[SLJIT_R2]);
  557     }
  558     else if (stack_size > 0) {
  559         if (word_arg_count >= 4)
  560             EMIT_MOV(compiler, TMP_REG1, 0, SLJIT_MEM1(SLJIT_SP), compiler->saveds_offset - sizeof(sljit_sw));
  561 
  562         FAIL_IF(emit_non_cum_binary(compiler, BINARY_OPCODE(SUB),
  563             SLJIT_SP, 0, SLJIT_SP, 0, SLJIT_IMM, stack_size));
  564 
  565         stack_size = 0;
  566         arg_types >>= SLJIT_DEF_SHIFT;
  567         word_arg_count = 0;
  568         float_arg_count = 0;
  569         while (arg_types) {
  570             switch (arg_types & SLJIT_DEF_MASK) {
  571             case SLJIT_ARG_TYPE_F32:
  572                 float_arg_count++;
  573                 FAIL_IF(emit_sse2_store(compiler, 1, SLJIT_MEM1(SLJIT_SP), stack_size, float_arg_count));
  574                 stack_size += sizeof(sljit_f32);
  575                 break;
  576             case SLJIT_ARG_TYPE_F64:
  577                 float_arg_count++;
  578                 FAIL_IF(emit_sse2_store(compiler, 0, SLJIT_MEM1(SLJIT_SP), stack_size, float_arg_count));
  579                 stack_size += sizeof(sljit_f64);
  580                 break;
  581             default:
  582                 word_arg_count++;
  583                 if (word_arg_count == 3) {
  584                     EMIT_MOV(compiler, SLJIT_MEM1(SLJIT_SP), stack_size, SLJIT_R2, 0);
  585                     stack_size += sizeof(sljit_sw);
  586                 }
  587                 else if (word_arg_count == 4) {
  588                     EMIT_MOV(compiler, SLJIT_MEM1(SLJIT_SP), stack_size, TMP_REG1, 0);
  589                     stack_size += sizeof(sljit_sw);
  590                 }
  591                 break;
  592             }
  593 
  594             arg_types >>= SLJIT_DEF_SHIFT;
  595         }
  596     }
  597 
  598     if (word_arg_count > 0) {
  599         if (swap_args) {
  600             inst = (sljit_u8*)ensure_buf(compiler, 1 + 1);
  601             FAIL_IF(!inst);
  602             INC_SIZE(1);
  603 
  604             *inst++ = XCHG_EAX_r | reg_map[SLJIT_R2];
  605         }
  606         else {
  607             inst = (sljit_u8*)ensure_buf(compiler, 1 + 2);
  608             FAIL_IF(!inst);
  609             INC_SIZE(2);
  610 
  611             *inst++ = MOV_r_rm;
  612             *inst++ = MOD_REG | (reg_map[SLJIT_R2] << 3) | reg_map[SLJIT_R0];
  613         }
  614     }
  615 
  616     return SLJIT_SUCCESS;
  617 }
  618 
  619 #endif
  620 
  621 static sljit_s32 cdecl_call_get_stack_size(struct sljit_compiler *compiler, sljit_s32 arg_types, sljit_s32 *word_arg_count_ptr)
  622 {
  623     sljit_s32 stack_size = 0;
  624     sljit_s32 word_arg_count = 0;
  625 
  626     arg_types >>= SLJIT_DEF_SHIFT;
  627 
  628     while (arg_types) {
  629         switch (arg_types & SLJIT_DEF_MASK) {
  630         case SLJIT_ARG_TYPE_F32:
  631             stack_size += sizeof(sljit_f32);
  632             break;
  633         case SLJIT_ARG_TYPE_F64:
  634             stack_size += sizeof(sljit_f64);
  635             break;
  636         default:
  637             word_arg_count++;
  638             stack_size += sizeof(sljit_sw);
  639             break;
  640         }
  641 
  642         arg_types >>= SLJIT_DEF_SHIFT;
  643     }
  644 
  645     if (word_arg_count_ptr)
  646         *word_arg_count_ptr = word_arg_count;
  647 
  648     if (stack_size <= compiler->stack_tmp_size)
  649         return 0;
  650 
  651 #if defined(__APPLE__)
  652     return ((stack_size - compiler->stack_tmp_size + 15) & ~15);
  653 #else
  654     return stack_size - compiler->stack_tmp_size;
  655 #endif
  656 }
  657 
  658 static sljit_s32 cdecl_call_with_args(struct sljit_compiler *compiler,
  659     sljit_s32 arg_types, sljit_s32 stack_size, sljit_s32 word_arg_count)
  660 {
  661     sljit_s32 float_arg_count = 0;
  662 
  663     if (word_arg_count >= 4)
  664         EMIT_MOV(compiler, TMP_REG1, 0, SLJIT_MEM1(SLJIT_SP), compiler->saveds_offset - sizeof(sljit_sw));
  665 
  666     if (stack_size > 0)
  667         FAIL_IF(emit_non_cum_binary(compiler, BINARY_OPCODE(SUB),
  668             SLJIT_SP, 0, SLJIT_SP, 0, SLJIT_IMM, stack_size));
  669 
  670     stack_size = 0;
  671     word_arg_count = 0;
  672     arg_types >>= SLJIT_DEF_SHIFT;
  673 
  674     while (arg_types) {
  675         switch (arg_types & SLJIT_DEF_MASK) {
  676         case SLJIT_ARG_TYPE_F32:
  677             float_arg_count++;
  678             FAIL_IF(emit_sse2_store(compiler, 1, SLJIT_MEM1(SLJIT_SP), stack_size, float_arg_count));
  679             stack_size += sizeof(sljit_f32);
  680             break;
  681         case SLJIT_ARG_TYPE_F64:
  682             float_arg_count++;
  683             FAIL_IF(emit_sse2_store(compiler, 0, SLJIT_MEM1(SLJIT_SP), stack_size, float_arg_count));
  684             stack_size += sizeof(sljit_f64);
  685             break;
  686         default:
  687             word_arg_count++;
  688             EMIT_MOV(compiler, SLJIT_MEM1(SLJIT_SP), stack_size, (word_arg_count >= 4) ? TMP_REG1 : word_arg_count, 0);
  689             stack_size += sizeof(sljit_sw);
  690             break;
  691         }
  692 
  693         arg_types >>= SLJIT_DEF_SHIFT;
  694     }
  695 
  696     return SLJIT_SUCCESS;
  697 }
  698 
  699 static sljit_s32 post_call_with_args(struct sljit_compiler *compiler,
  700     sljit_s32 arg_types, sljit_s32 stack_size)
  701 {
  702     sljit_u8 *inst;
  703     sljit_s32 single;
  704 
  705     if (stack_size > 0)
  706         FAIL_IF(emit_cum_binary(compiler, BINARY_OPCODE(ADD),
  707             SLJIT_SP, 0, SLJIT_SP, 0, SLJIT_IMM, stack_size));
  708 
  709     if ((arg_types & SLJIT_DEF_MASK) < SLJIT_ARG_TYPE_F32)
  710         return SLJIT_SUCCESS;
  711 
  712     single = ((arg_types & SLJIT_DEF_MASK) == SLJIT_ARG_TYPE_F32);
  713 
  714     inst = (sljit_u8*)ensure_buf(compiler, 1 + 3);
  715     FAIL_IF(!inst);
  716     INC_SIZE(3);
  717     inst[0] = single ? FSTPS : FSTPD;
  718     inst[1] = (0x03 << 3) | 0x04;
  719     inst[2] = (0x04 << 3) | reg_map[SLJIT_SP];
  720 
  721     return emit_sse2_load(compiler, single, SLJIT_FR0, SLJIT_MEM1(SLJIT_SP), 0);
  722 }
  723 
  724 SLJIT_API_FUNC_ATTRIBUTE struct sljit_jump* sljit_emit_call(struct sljit_compiler *compiler, sljit_s32 type,
  725     sljit_s32 arg_types)
  726 {
  727     struct sljit_jump *jump;
  728     sljit_s32 stack_size = 0;
  729     sljit_s32 word_arg_count;
  730 
  731     CHECK_ERROR_PTR();
  732     CHECK_PTR(check_sljit_emit_call(compiler, type, arg_types));
  733 
  734 #if (defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL)
  735     if ((type & 0xff) == SLJIT_CALL) {
  736         stack_size = c_fast_call_get_stack_size(arg_types, &word_arg_count);
  737         PTR_FAIL_IF(c_fast_call_with_args(compiler, arg_types, stack_size, word_arg_count, 0));
  738 
  739 #if (defined SLJIT_VERBOSE && SLJIT_VERBOSE) \
  740         || (defined SLJIT_ARGUMENT_CHECKS && SLJIT_ARGUMENT_CHECKS)
  741         compiler->skip_checks = 1;
  742 #endif
  743 
  744         jump = sljit_emit_jump(compiler, type);
  745         PTR_FAIL_IF(jump == NULL);
  746 
  747         PTR_FAIL_IF(post_call_with_args(compiler, arg_types, 0));
  748         return jump;
  749     }
  750 #endif
  751 
  752     stack_size = cdecl_call_get_stack_size(compiler, arg_types, &word_arg_count);
  753     PTR_FAIL_IF(cdecl_call_with_args(compiler, arg_types, stack_size, word_arg_count));
  754 
  755 #if (defined SLJIT_VERBOSE && SLJIT_VERBOSE) \
  756         || (defined SLJIT_ARGUMENT_CHECKS && SLJIT_ARGUMENT_CHECKS)
  757     compiler->skip_checks = 1;
  758 #endif
  759 
  760     jump = sljit_emit_jump(compiler, type);
  761     PTR_FAIL_IF(jump == NULL);
  762 
  763     PTR_FAIL_IF(post_call_with_args(compiler, arg_types, stack_size));
  764     return jump;
  765 }
  766 
  767 SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_icall(struct sljit_compiler *compiler, sljit_s32 type,
  768     sljit_s32 arg_types,
  769     sljit_s32 src, sljit_sw srcw)
  770 {
  771     sljit_s32 stack_size = 0;
  772     sljit_s32 word_arg_count;
  773 #if (defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL)
  774     sljit_s32 swap_args;
  775 #endif
  776 
  777     CHECK_ERROR();
  778     CHECK(check_sljit_emit_icall(compiler, type, arg_types, src, srcw));
  779 
  780 #if (defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL)
  781     SLJIT_ASSERT(reg_map[SLJIT_R0] == 0 && reg_map[SLJIT_R2] == 1 && SLJIT_R0 == 1 && SLJIT_R2 == 3);
  782 
  783     if ((type & 0xff) == SLJIT_CALL) {
  784         stack_size = c_fast_call_get_stack_size(arg_types, &word_arg_count);
  785         swap_args = 0;
  786 
  787         if (word_arg_count > 0) {
  788             if ((src & REG_MASK) == SLJIT_R2 || OFFS_REG(src) == SLJIT_R2) {
  789                 swap_args = 1;
  790                 if (((src & REG_MASK) | 0x2) == SLJIT_R2)
  791                     src ^= 0x2;
  792                 if ((OFFS_REG(src) | 0x2) == SLJIT_R2)
  793                     src ^= TO_OFFS_REG(0x2);
  794             }
  795         }
  796 
  797         FAIL_IF(c_fast_call_with_args(compiler, arg_types, stack_size, word_arg_count, swap_args));
  798 
  799         compiler->saveds_offset += stack_size;
  800         compiler->locals_offset += stack_size;
  801 
  802 #if (defined SLJIT_VERBOSE && SLJIT_VERBOSE) \
  803         || (defined SLJIT_ARGUMENT_CHECKS && SLJIT_ARGUMENT_CHECKS)
  804         compiler->skip_checks = 1;
  805 #endif
  806         FAIL_IF(sljit_emit_ijump(compiler, type, src, srcw));
  807 
  808         compiler->saveds_offset -= stack_size;
  809         compiler->locals_offset -= stack_size;
  810 
  811         return post_call_with_args(compiler, arg_types, 0);
  812     }
  813 #endif
  814 
  815     stack_size = cdecl_call_get_stack_size(compiler, arg_types, &word_arg_count);
  816     FAIL_IF(cdecl_call_with_args(compiler, arg_types, stack_size, word_arg_count));
  817 
  818     compiler->saveds_offset += stack_size;
  819     compiler->locals_offset += stack_size;
  820 
  821 #if (defined SLJIT_VERBOSE && SLJIT_VERBOSE) \
  822         || (defined SLJIT_ARGUMENT_CHECKS && SLJIT_ARGUMENT_CHECKS)
  823     compiler->skip_checks = 1;
  824 #endif
  825     FAIL_IF(sljit_emit_ijump(compiler, type, src, srcw));
  826 
  827     compiler->saveds_offset -= stack_size;
  828     compiler->locals_offset -= stack_size;
  829 
  830     return post_call_with_args(compiler, arg_types, stack_size);
  831 }
  832 
  833 SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_fast_enter(struct sljit_compiler *compiler, sljit_s32 dst, sljit_sw dstw)
  834 {
  835     sljit_u8 *inst;
  836 
  837     CHECK_ERROR();
  838     CHECK(check_sljit_emit_fast_enter(compiler, dst, dstw));
  839     ADJUST_LOCAL_OFFSET(dst, dstw);
  840 
  841     CHECK_EXTRA_REGS(dst, dstw, (void)0);
  842 
  843     /* For UNUSED dst. Uncommon, but possible. */
  844     if (dst == SLJIT_UNUSED)
  845         dst = TMP_REG1;
  846 
  847     if (FAST_IS_REG(dst)) {
  848         /* Unused dest is possible here. */
  849         inst = (sljit_u8*)ensure_buf(compiler, 1 + 1);
  850         FAIL_IF(!inst);
  851 
  852         INC_SIZE(1);
  853         POP_REG(reg_map[dst]);
  854         return SLJIT_SUCCESS;
  855     }
  856 
  857     /* Memory. */
  858     inst = emit_x86_instruction(compiler, 1, 0, 0, dst, dstw);
  859     FAIL_IF(!inst);
  860     *inst++ = POP_rm;
  861     return SLJIT_SUCCESS;
  862 }
  863 
  864 SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_fast_return(struct sljit_compiler *compiler, sljit_s32 src, sljit_sw srcw)
  865 {
  866     sljit_u8 *inst;
  867 
  868     CHECK_ERROR();
  869     CHECK(check_sljit_emit_fast_return(compiler, src, srcw));
  870     ADJUST_LOCAL_OFFSET(src, srcw);
  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 }