SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_fast_return(struct sljit_compiler *compiler, sljit_s32 src, sljit_sw srcw)
{
sljit_u8 *inst;
CHECK_ERROR();
CHECK(check_sljit_emit_fast_return(compiler, src, srcw));
ADJUST_LOCAL_OFFSET(src, srcw);
if ((src & SLJIT_IMM) && NOT_HALFWORD(srcw)) {
FAIL_IF(emit_load_imm64(compiler, TMP_REG1, srcw));
src = TMP_REG1;
}
if (FAST_IS_REG(src)) {
if (reg_map[src] < 8) {
inst = (sljit_u8*)ensure_buf(compiler, 1 + 1 + 1);
FAIL_IF(!inst);
INC_SIZE(1 + 1);
PUSH_REG(reg_lmap[src]);
}
else {
inst = (sljit_u8*)ensure_buf(compiler, 1 + 2 + 1);
FAIL_IF(!inst);
INC_SIZE(2 + 1);
*inst++ = REX_B;
PUSH_REG(reg_lmap[src]);
}
}
else if (src & SLJIT_MEM) {
/* REX_W is not necessary (src is not immediate). */
compiler->mode32 = 1;
inst = emit_x86_instruction(compiler, 1, 0, 0, src, srcw);
FAIL_IF(!inst);
*inst++ = GROUP_FF;
*inst |= PUSH_rm;
inst = (sljit_u8*)ensure_buf(compiler, 1 + 1);
FAIL_IF(!inst);
INC_SIZE(1);
}
else {
SLJIT_ASSERT(IS_HALFWORD(srcw));
/* SLJIT_IMM. */
inst = (sljit_u8*)ensure_buf(compiler, 1 + 5 + 1);
FAIL_IF(!inst);
INC_SIZE(5 + 1);
*inst++ = PUSH_i32;
sljit_unaligned_store_s32(inst, srcw);
inst += sizeof(sljit_s32);
}
RET();
return SLJIT_SUCCESS;
}
static sljit_u8* emit_x86_instruction(struct sljit_compiler *compiler, sljit_s32 size,
/* The register or immediate operand. */
sljit_s32 a, sljit_sw imma,
/* The general operand (not immediate). */
sljit_s32 b, sljit_sw immb)
{
sljit_u8 *inst;
sljit_u8 *buf_ptr;
sljit_u8 rex = 0;
sljit_s32 flags = size & ~0xf;
sljit_s32 inst_size;
/* The immediate operand must be 32 bit. */
SLJIT_ASSERT(!(a & SLJIT_IMM) || compiler->mode32 || IS_HALFWORD(imma));
/* Both cannot be switched on. */
SLJIT_ASSERT((flags & (EX86_BIN_INS | EX86_SHIFT_INS)) != (EX86_BIN_INS | EX86_SHIFT_INS));
/* Size flags not allowed for typed instructions. */
SLJIT_ASSERT(!(flags & (EX86_BIN_INS | EX86_SHIFT_INS)) || (flags & (EX86_BYTE_ARG | EX86_HALF_ARG)) == 0);
/* Both size flags cannot be switched on. */
SLJIT_ASSERT((flags & (EX86_BYTE_ARG | EX86_HALF_ARG)) != (EX86_BYTE_ARG | EX86_HALF_ARG));
/* SSE2 and immediate is not possible. */
SLJIT_ASSERT(!(a & SLJIT_IMM) || !(flags & EX86_SSE2));
SLJIT_ASSERT((flags & (EX86_PREF_F2 | EX86_PREF_F3)) != (EX86_PREF_F2 | EX86_PREF_F3)
&& (flags & (EX86_PREF_F2 | EX86_PREF_66)) != (EX86_PREF_F2 | EX86_PREF_66)
&& (flags & (EX86_PREF_F3 | EX86_PREF_66)) != (EX86_PREF_F3 | EX86_PREF_66));
size &= 0xf;
inst_size = size;
if (!compiler->mode32 && !(flags & EX86_NO_REXW))
rex |= REX_W;
else if (flags & EX86_REX)
rex |= REX;
if (flags & (EX86_PREF_F2 | EX86_PREF_F3))
inst_size++;
if (flags & EX86_PREF_66)
inst_size++;
/* Calculate size of b. */
inst_size += 1; /* mod r/m byte. */
if (b & SLJIT_MEM) {
if (!(b & OFFS_REG_MASK)) {
if (NOT_HALFWORD(immb)) {
PTR_FAIL_IF(emit_load_imm64(compiler, TMP_REG3, immb));
immb = 0;
if (b & REG_MASK)
b |= TO_OFFS_REG(TMP_REG3);
else
b |= TMP_REG3;
}
else if (reg_lmap[b & REG_MASK] == 4)
b |= TO_OFFS_REG(SLJIT_SP);
}
if ((b & REG_MASK) == SLJIT_UNUSED)
inst_size += 1 + sizeof(sljit_s32); /* SIB byte required to avoid RIP based addressing. */
else {
if (reg_map[b & REG_MASK] >= 8)
rex |= REX_B;
if (immb != 0 && (!(b & OFFS_REG_MASK) || (b & OFFS_REG_MASK) == TO_OFFS_REG(SLJIT_SP))) {
/* Immediate operand. */
if (immb <= 127 && immb >= -128)
inst_size += sizeof(sljit_s8);
else
inst_size += sizeof(sljit_s32);
}
else if (reg_lmap[b & REG_MASK] == 5)
inst_size += sizeof(sljit_s8);
if ((b & OFFS_REG_MASK) != SLJIT_UNUSED) {
inst_size += 1; /* SIB byte. */
if (reg_map[OFFS_REG(b)] >= 8)
rex |= REX_X;
}
}
}
else if (!(flags & EX86_SSE2_OP2) && reg_map[b] >= 8)
rex |= REX_B;
if (a & SLJIT_IMM) {
if (flags & EX86_BIN_INS) {
if (imma <= 127 && imma >= -128) {
inst_size += 1;
flags |= EX86_BYTE_ARG;
} else
inst_size += 4;
}
else if (flags & EX86_SHIFT_INS) {
imma &= compiler->mode32 ? 0x1f : 0x3f;
if (imma != 1) {
inst_size ++;
flags |= EX86_BYTE_ARG;
}
} else if (flags & EX86_BYTE_ARG)
inst_size++;
else if (flags & EX86_HALF_ARG)
inst_size += sizeof(short);
else
inst_size += sizeof(sljit_s32);
}
else {
SLJIT_ASSERT(!(flags & EX86_SHIFT_INS) || a == SLJIT_PREF_SHIFT_REG);
/* reg_map[SLJIT_PREF_SHIFT_REG] is less than 8. */
if (!(flags & EX86_SSE2_OP1) && reg_map[a] >= 8)
rex |= REX_R;
}
if (rex)
inst_size++;
inst = (sljit_u8*)ensure_buf(compiler, 1 + inst_size);
PTR_FAIL_IF(!inst);
/* Encoding the byte. */
INC_SIZE(inst_size);
if (flags & EX86_PREF_F2)
*inst++ = 0xf2;
if (flags & EX86_PREF_F3)
*inst++ = 0xf3;
if (flags & EX86_PREF_66)
*inst++ = 0x66;
if (rex)
*inst++ = rex;
buf_ptr = inst + size;
/* Encode mod/rm byte. */
if (!(flags & EX86_SHIFT_INS)) {
if ((flags & EX86_BIN_INS) && (a & SLJIT_IMM))
*inst = (flags & EX86_BYTE_ARG) ? GROUP_BINARY_83 : GROUP_BINARY_81;
if ((a & SLJIT_IMM) || (a == 0))
*buf_ptr = 0;
else if (!(flags & EX86_SSE2_OP1))
*buf_ptr = reg_lmap[a] << 3;
else
*buf_ptr = a << 3;
}
else {
if (a & SLJIT_IMM) {
if (imma == 1)
*inst = GROUP_SHIFT_1;
else
*inst = GROUP_SHIFT_N;
} else
*inst = GROUP_SHIFT_CL;
*buf_ptr = 0;
}
if (!(b & SLJIT_MEM))
*buf_ptr++ |= MOD_REG + ((!(flags & EX86_SSE2_OP2)) ? reg_lmap[b] : b);
else if ((b & REG_MASK) != SLJIT_UNUSED) {
if ((b & OFFS_REG_MASK) == SLJIT_UNUSED || (b & OFFS_REG_MASK) == TO_OFFS_REG(SLJIT_SP)) {
if (immb != 0 || reg_lmap[b & REG_MASK] == 5) {
if (immb <= 127 && immb >= -128)
*buf_ptr |= 0x40;
else
*buf_ptr |= 0x80;
}
if ((b & OFFS_REG_MASK) == SLJIT_UNUSED)
*buf_ptr++ |= reg_lmap[b & REG_MASK];
else {
*buf_ptr++ |= 0x04;
*buf_ptr++ = reg_lmap[b & REG_MASK] | (reg_lmap[OFFS_REG(b)] << 3);
}
if (immb != 0 || reg_lmap[b & REG_MASK] == 5) {
if (immb <= 127 && immb >= -128)
*buf_ptr++ = immb; /* 8 bit displacement. */
else {
sljit_unaligned_store_s32(buf_ptr, immb); /* 32 bit displacement. */
buf_ptr += sizeof(sljit_s32);
}
}
}
else {
if (reg_lmap[b & REG_MASK] == 5)
*buf_ptr |= 0x40;
*buf_ptr++ |= 0x04;
*buf_ptr++ = reg_lmap[b & REG_MASK] | (reg_lmap[OFFS_REG(b)] << 3) | (immb << 6);
if (reg_lmap[b & REG_MASK] == 5)
*buf_ptr++ = 0;
}
}
else {
*buf_ptr++ |= 0x04;
*buf_ptr++ = 0x25;
sljit_unaligned_store_s32(buf_ptr, immb); /* 32 bit displacement. */
buf_ptr += sizeof(sljit_s32);
}
if (a & SLJIT_IMM) {
if (flags & EX86_BYTE_ARG)
*buf_ptr = imma;
else if (flags & EX86_HALF_ARG)
sljit_unaligned_store_s16(buf_ptr, imma);
else if (!(flags & EX86_SHIFT_INS))
sljit_unaligned_store_s32(buf_ptr, imma);
}
return !(flags & EX86_SHIFT_INS) ? inst : (inst + 1);
}
static sljit_ub* emit_x86_instruction(struct sljit_compiler *compiler, sljit_si size,
/* The register or immediate operand. */
sljit_si a, sljit_sw imma,
/* The general operand (not immediate). */
sljit_si b, sljit_sw immb)
{
sljit_ub *inst;
sljit_ub *buf_ptr;
sljit_ub rex = 0;
sljit_si flags = size & ~0xf;
sljit_si inst_size;
/* The immediate operand must be 32 bit. */
SLJIT_ASSERT(!(a & SLJIT_IMM) || compiler->mode32 || IS_HALFWORD(imma));
/* Both cannot be switched on. */
SLJIT_ASSERT((flags & (EX86_BIN_INS | EX86_SHIFT_INS)) != (EX86_BIN_INS | EX86_SHIFT_INS));
/* Size flags not allowed for typed instructions. */
SLJIT_ASSERT(!(flags & (EX86_BIN_INS | EX86_SHIFT_INS)) || (flags & (EX86_BYTE_ARG | EX86_HALF_ARG)) == 0);
/* Both size flags cannot be switched on. */
SLJIT_ASSERT((flags & (EX86_BYTE_ARG | EX86_HALF_ARG)) != (EX86_BYTE_ARG | EX86_HALF_ARG));
#if (defined SLJIT_SSE2 && SLJIT_SSE2)
/* SSE2 and immediate is not possible. */
SLJIT_ASSERT(!(a & SLJIT_IMM) || !(flags & EX86_SSE2));
SLJIT_ASSERT((flags & (EX86_PREF_F2 | EX86_PREF_F3)) != (EX86_PREF_F2 | EX86_PREF_F3)
&& (flags & (EX86_PREF_F2 | EX86_PREF_66)) != (EX86_PREF_F2 | EX86_PREF_66)
&& (flags & (EX86_PREF_F3 | EX86_PREF_66)) != (EX86_PREF_F3 | EX86_PREF_66));
#endif
size &= 0xf;
inst_size = size;
if ((b & SLJIT_MEM) && !(b & 0xf0) && NOT_HALFWORD(immb)) {
if (emit_load_imm64(compiler, TMP_REG3, immb))
return NULL;
immb = 0;
if (b & 0xf)
b |= TMP_REG3 << 4;
else
b |= TMP_REG3;
}
if (!compiler->mode32 && !(flags & EX86_NO_REXW))
rex |= REX_W;
else if (flags & EX86_REX)
rex |= REX;
#if (defined SLJIT_SSE2 && SLJIT_SSE2)
if (flags & (EX86_PREF_F2 | EX86_PREF_F3))
inst_size++;
#endif
if (flags & EX86_PREF_66)
inst_size++;
/* Calculate size of b. */
inst_size += 1; /* mod r/m byte. */
if (b & SLJIT_MEM) {
if ((b & 0x0f) == SLJIT_UNUSED)
inst_size += 1 + sizeof(sljit_si); /* SIB byte required to avoid RIP based addressing. */
else {
if (reg_map[b & 0x0f] >= 8)
rex |= REX_B;
if (immb != 0 && !(b & 0xf0)) {
/* Immediate operand. */
if (immb <= 127 && immb >= -128)
inst_size += sizeof(sljit_sb);
else
inst_size += sizeof(sljit_si);
}
}
if ((b & 0xf) == SLJIT_LOCALS_REG && !(b & 0xf0))
b |= SLJIT_LOCALS_REG << 4;
if ((b & 0xf0) != SLJIT_UNUSED) {
inst_size += 1; /* SIB byte. */
if (reg_map[(b >> 4) & 0x0f] >= 8)
rex |= REX_X;
}
}
