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pcre2/src/sljit/sljitNativeX86_32.c

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/*
* Stack-less Just-In-Time compiler
*
* Copyright Zoltan Herczeg (hzmester@freemail.hu). All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification, are
* permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this list of
* conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice, this list
* of conditions and the following disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) AND CONTRIBUTORS ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
* SHALL THE COPYRIGHT HOLDER(S) OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/* x86 32-bit arch dependent functions. */
/* --------------------------------------------------------------------- */
/* Operators */
/* --------------------------------------------------------------------- */
static sljit_s32 emit_do_imm(struct sljit_compiler *compiler, sljit_u8 opcode, sljit_sw imm)
{
sljit_u8 *inst;
inst = (sljit_u8*)ensure_buf(compiler, 1 + 1 + sizeof(sljit_sw));
FAIL_IF(!inst);
INC_SIZE(1 + sizeof(sljit_sw));
*inst++ = opcode;
sljit_unaligned_store_sw(inst, imm);
return SLJIT_SUCCESS;
}
/* Size contains the flags as well. */
static sljit_u8* emit_x86_instruction(struct sljit_compiler *compiler, sljit_uw 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 reg_map_b;
sljit_uw flags = size;
sljit_uw inst_size;
/* 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 (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 & REG_MASK))
inst_size += sizeof(sljit_sw);
else {
if (immb != 0 && !(b & OFFS_REG_MASK)) {
/* Immediate operand. */
if (immb <= 127 && immb >= -128)
inst_size += sizeof(sljit_s8);
else
inst_size += sizeof(sljit_sw);
}
else if (reg_map[b & REG_MASK] == 5) {
/* Swap registers if possible. */
if ((b & OFFS_REG_MASK) && (immb & 0x3) == 0 && reg_map[OFFS_REG(b)] != 5)
b = SLJIT_MEM | OFFS_REG(b) | TO_OFFS_REG(b & REG_MASK);
else
inst_size += sizeof(sljit_s8);
}
if (reg_map[b & REG_MASK] == 4 && !(b & OFFS_REG_MASK))
b |= TO_OFFS_REG(SLJIT_SP);
if (b & OFFS_REG_MASK)
inst_size += 1; /* SIB byte. */
}
}
/* Calculate size of a. */
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 &= 0x1f;
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_sw);
}
else
SLJIT_ASSERT(!(flags & EX86_SHIFT_INS) || a == SLJIT_PREF_SHIFT_REG);
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;
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)
*buf_ptr = 0;
else if (!(flags & EX86_SSE2_OP1))
*buf_ptr = U8(reg_map[a] << 3);
else
*buf_ptr = U8(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 = U8(*buf_ptr | MOD_REG | (!(flags & EX86_SSE2_OP2) ? reg_map[b] : b));
buf_ptr++;
} else if (b & REG_MASK) {
reg_map_b = reg_map[b & REG_MASK];
if (!(b & OFFS_REG_MASK) || (b & OFFS_REG_MASK) == TO_OFFS_REG(SLJIT_SP)) {
if (immb != 0 || reg_map_b == 5) {
if (immb <= 127 && immb >= -128)
*buf_ptr |= 0x40;
else
*buf_ptr |= 0x80;
}
if (!(b & OFFS_REG_MASK))
*buf_ptr++ |= reg_map_b;
else {
*buf_ptr++ |= 0x04;
*buf_ptr++ = U8(reg_map_b | (reg_map[OFFS_REG(b)] << 3));
}
if (immb != 0 || reg_map_b == 5) {
if (immb <= 127 && immb >= -128)
*buf_ptr++ = U8(immb); /* 8 bit displacement. */
else {
sljit_unaligned_store_sw(buf_ptr, immb); /* 32 bit displacement. */
buf_ptr += sizeof(sljit_sw);
}
}
}
else {
if (reg_map_b == 5)
*buf_ptr |= 0x40;
*buf_ptr++ |= 0x04;
*buf_ptr++ = U8(reg_map_b | (reg_map[OFFS_REG(b)] << 3) | (immb << 6));
if (reg_map_b == 5)
*buf_ptr++ = 0;
}
}
else {
*buf_ptr++ |= 0x05;
sljit_unaligned_store_sw(buf_ptr, immb); /* 32 bit displacement. */
buf_ptr += sizeof(sljit_sw);
}
if (a & SLJIT_IMM) {
if (flags & EX86_BYTE_ARG)
*buf_ptr = U8(imma);
else if (flags & EX86_HALF_ARG)
sljit_unaligned_store_s16(buf_ptr, (sljit_s16)imma);
else if (!(flags & EX86_SHIFT_INS))
sljit_unaligned_store_sw(buf_ptr, imma);
}
return !(flags & EX86_SHIFT_INS) ? inst : (inst + 1);
}
/* --------------------------------------------------------------------- */
/* Enter / return */
/* --------------------------------------------------------------------- */
static sljit_u8* generate_far_jump_code(struct sljit_jump *jump, sljit_u8 *code_ptr, sljit_sw executable_offset)
{
sljit_uw type = jump->flags >> TYPE_SHIFT;
if (type == SLJIT_JUMP) {
*code_ptr++ = JMP_i32;
jump->addr++;
}
else if (type >= SLJIT_FAST_CALL) {
*code_ptr++ = CALL_i32;
jump->addr++;
}
else {
*code_ptr++ = GROUP_0F;
*code_ptr++ = get_jump_code(type);
jump->addr += 2;
}
if (jump->flags & JUMP_LABEL)
jump->flags |= PATCH_MW;
else
sljit_unaligned_store_sw(code_ptr, (sljit_sw)(jump->u.target - (jump->addr + 4) - (sljit_uw)executable_offset));
code_ptr += 4;
return code_ptr;
}
#define ENTER_TMP_TO_R4 0x00001
#define ENTER_TMP_TO_S 0x00002
SLJIT_API_FUNC_ATTRIBUTE sljit_s32 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)
{
sljit_s32 word_arg_count, saved_arg_count, float_arg_count;
sljit_s32 size, locals_offset, args_size, types, status;
sljit_s32 kept_saveds_count = SLJIT_KEPT_SAVEDS_COUNT(options);
sljit_u8 *inst;
#ifdef _WIN32
sljit_s32 r2_offset = -1;
#endif
CHECK_ERROR();
CHECK(check_sljit_emit_enter(compiler, options, arg_types, scratches, saveds, fscratches, fsaveds, local_size));
set_emit_enter(compiler, options, arg_types, scratches, saveds, fscratches, fsaveds, local_size);
/* Emit ENDBR32 at function entry if needed. */
FAIL_IF(emit_endbranch(compiler));
SLJIT_COMPILE_ASSERT(SLJIT_FR0 == 1, float_register_index_start);
arg_types >>= SLJIT_ARG_SHIFT;
word_arg_count = 0;
status = 0;
if (options & SLJIT_ENTER_REG_ARG) {
args_size = 0;
while (arg_types) {
if ((arg_types & SLJIT_ARG_MASK) < SLJIT_ARG_TYPE_F64) {
word_arg_count++;
if (word_arg_count >= 4) {
status |= ENTER_TMP_TO_R4;
args_size = SSIZE_OF(sw);
}
}
arg_types >>= SLJIT_ARG_SHIFT;
}
} else {
types = arg_types;
saved_arg_count = 0;
float_arg_count = 0;
args_size = SSIZE_OF(sw);
while (types) {
switch (types & SLJIT_ARG_MASK) {
case SLJIT_ARG_TYPE_F64:
float_arg_count++;
FAIL_IF(emit_sse2_load(compiler, 0, float_arg_count, SLJIT_MEM1(SLJIT_SP), args_size));
args_size += SSIZE_OF(f64);
break;
case SLJIT_ARG_TYPE_F32:
float_arg_count++;
FAIL_IF(emit_sse2_load(compiler, 1, float_arg_count, SLJIT_MEM1(SLJIT_SP), args_size));
args_size += SSIZE_OF(f32);
break;
default:
word_arg_count++;
if (!(types & SLJIT_ARG_TYPE_SCRATCH_REG))
saved_arg_count++;
if (word_arg_count == 4) {
if (types & SLJIT_ARG_TYPE_SCRATCH_REG) {
status |= ENTER_TMP_TO_R4;
arg_types &= ~(SLJIT_ARG_FULL_MASK << 3 * SLJIT_ARG_SHIFT);
} else if (saved_arg_count == 4) {
status |= ENTER_TMP_TO_S;
arg_types &= ~(SLJIT_ARG_FULL_MASK << 3 * SLJIT_ARG_SHIFT);
}
}
args_size += SSIZE_OF(sw);
break;
}
types >>= SLJIT_ARG_SHIFT;
}
args_size -= SSIZE_OF(sw);
}
compiler->args_size = args_size;
/* [esp+0] for saving temporaries and function calls. */
locals_offset = 2 * SSIZE_OF(sw);
if (scratches >= 3)
locals_offset = 4 * SSIZE_OF(sw);
compiler->scratches_offset = locals_offset;
if (scratches > 3)
locals_offset += ((scratches > (3 + 6)) ? 6 : (scratches - 3)) * SSIZE_OF(sw);
if (saveds > 3)
locals_offset += (saveds - 3) * SSIZE_OF(sw);
compiler->locals_offset = locals_offset;
size = (scratches > 9 ? (scratches - 9) : 0) + (saveds <= 3 ? saveds : 3) - kept_saveds_count;
if (!(options & SLJIT_ENTER_REG_ARG))
size++;
if (size != 0) {
inst = (sljit_u8*)ensure_buf(compiler, (sljit_uw)(size + 1));
FAIL_IF(!inst);
INC_SIZE((sljit_uw)size);
if (!(options & SLJIT_ENTER_REG_ARG))
PUSH_REG(reg_map[TMP_REG1]);
if ((saveds > 2 && kept_saveds_count <= 2) || scratches > 9)
PUSH_REG(reg_map[SLJIT_S2]);
if ((saveds > 1 && kept_saveds_count <= 1) || scratches > 10)
PUSH_REG(reg_map[SLJIT_S1]);
if ((saveds > 0 && kept_saveds_count == 0) || scratches > 11)
PUSH_REG(reg_map[SLJIT_S0]);
size *= SSIZE_OF(sw);
}
if (status & (ENTER_TMP_TO_R4 | ENTER_TMP_TO_S))
EMIT_MOV(compiler, TMP_REG1, 0, SLJIT_MEM1(SLJIT_SP), args_size + size);
size += SSIZE_OF(sw);
local_size = ((locals_offset + local_size + size + 0xf) & ~0xf) - size;
compiler->local_size = local_size;
word_arg_count = 0;
saved_arg_count = 0;
args_size = size;
while (arg_types) {
switch (arg_types & SLJIT_ARG_MASK) {
case SLJIT_ARG_TYPE_F64:
args_size += SSIZE_OF(f64);
break;
case SLJIT_ARG_TYPE_F32:
args_size += SSIZE_OF(f32);
break;
default:
word_arg_count++;
SLJIT_ASSERT(word_arg_count <= 3 || (word_arg_count == 4 && !(status & (ENTER_TMP_TO_R4 | ENTER_TMP_TO_S))));
if (arg_types & SLJIT_ARG_TYPE_SCRATCH_REG) {
#ifdef _WIN32
if (word_arg_count == 3 && local_size > 4 * 4096)
r2_offset = local_size + args_size;
else
#endif
EMIT_MOV(compiler, word_arg_count, 0, SLJIT_MEM1(SLJIT_SP), args_size);
} else {
EMIT_MOV(compiler, SLJIT_S0 - saved_arg_count, 0, SLJIT_MEM1(SLJIT_SP), args_size);
saved_arg_count++;
}
args_size += SSIZE_OF(sw);
break;
}
arg_types >>= SLJIT_ARG_SHIFT;
}
SLJIT_ASSERT(SLJIT_LOCALS_OFFSET > 0);
#ifdef _WIN32
SLJIT_ASSERT(r2_offset == -1 || local_size > 4 * 4096);
if (local_size > 4096) {
if (local_size <= 4 * 4096) {
BINARY_IMM32(OR, 0, SLJIT_MEM1(SLJIT_SP), -4096);
if (local_size > 2 * 4096)
BINARY_IMM32(OR, 0, SLJIT_MEM1(SLJIT_SP), -4096 * 2);
if (local_size > 3 * 4096)
BINARY_IMM32(OR, 0, SLJIT_MEM1(SLJIT_SP), -4096 * 3);
}
else {
if (options & SLJIT_ENTER_REG_ARG) {
SLJIT_ASSERT(r2_offset == -1);
inst = (sljit_u8*)ensure_buf(compiler, (sljit_uw)(1 + 1));
FAIL_IF(!inst);
INC_SIZE(1);
PUSH_REG(reg_map[SLJIT_R2]);
local_size -= SSIZE_OF(sw);
r2_offset = local_size;
}
EMIT_MOV(compiler, SLJIT_R2, 0, SLJIT_IMM, local_size >> 12);
BINARY_IMM32(OR, 0, SLJIT_MEM1(SLJIT_SP), -4096);
BINARY_IMM32(SUB, 4096, SLJIT_SP, 0);
inst = (sljit_u8*)ensure_buf(compiler, 1 + 2);
FAIL_IF(!inst);
INC_SIZE(2);
inst[0] = LOOP_i8;
inst[1] = (sljit_u8)-16;
local_size &= 0xfff;
}
}
if (local_size > 0) {
BINARY_IMM32(OR, 0, SLJIT_MEM1(SLJIT_SP), -local_size);
BINARY_IMM32(SUB, local_size, SLJIT_SP, 0);
}
if (r2_offset != -1)
EMIT_MOV(compiler, SLJIT_R2, 0, SLJIT_MEM1(SLJIT_SP), r2_offset);
#else /* !_WIN32 */
SLJIT_ASSERT(local_size > 0);
BINARY_IMM32(SUB, local_size, SLJIT_SP, 0);
#endif /* _WIN32 */
locals_offset -= SSIZE_OF(sw);
kept_saveds_count = SLJIT_R3 - kept_saveds_count;
while (saved_arg_count > 3) {
EMIT_MOV(compiler, SLJIT_MEM1(SLJIT_SP), locals_offset, kept_saveds_count, 0);
kept_saveds_count++;
locals_offset -= SSIZE_OF(sw);
saved_arg_count--;
}
if (status & (ENTER_TMP_TO_R4 | ENTER_TMP_TO_S)) {
size = (status & ENTER_TMP_TO_R4) ? compiler->scratches_offset : locals_offset;
EMIT_MOV(compiler, SLJIT_MEM1(SLJIT_SP), size, TMP_REG1, 0);
}
return SLJIT_SUCCESS;
}
SLJIT_API_FUNC_ATTRIBUTE sljit_s32 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)
{
sljit_s32 args_size, locals_offset;
CHECK_ERROR();
CHECK(check_sljit_set_context(compiler, options, arg_types, scratches, saveds, fscratches, fsaveds, local_size));
set_set_context(compiler, options, arg_types, scratches, saveds, fscratches, fsaveds, local_size);
arg_types >>= SLJIT_ARG_SHIFT;
args_size = 0;
if (!(options & SLJIT_ENTER_REG_ARG)) {
while (arg_types) {
switch (arg_types & SLJIT_ARG_MASK) {
case SLJIT_ARG_TYPE_F64:
args_size += SSIZE_OF(f64);
break;
case SLJIT_ARG_TYPE_F32:
args_size += SSIZE_OF(f32);
break;
default:
args_size += SSIZE_OF(sw);
break;
}
arg_types >>= SLJIT_ARG_SHIFT;
}
}
compiler->args_size = args_size;
/* [esp+0] for saving temporaries and function calls. */
locals_offset = 2 * SSIZE_OF(sw);
if (scratches >= 3)
locals_offset = 4 * SSIZE_OF(sw);
compiler->scratches_offset = locals_offset;
if (scratches > 3)
locals_offset += ((scratches > (3 + 6)) ? 6 : (scratches - 3)) * SSIZE_OF(sw);
if (saveds > 3)
locals_offset += (saveds - 3) * SSIZE_OF(sw);
compiler->locals_offset = locals_offset;
saveds = (1 + (scratches > 9 ? (scratches - 9) : 0) + (saveds <= 3 ? saveds : 3) - SLJIT_KEPT_SAVEDS_COUNT(options)) * SSIZE_OF(sw);
if (!(options & SLJIT_ENTER_REG_ARG))
saveds += SSIZE_OF(sw);
compiler->local_size = ((locals_offset + local_size + saveds + 0xf) & ~0xf) - saveds;
return SLJIT_SUCCESS;
}
static sljit_s32 emit_stack_frame_release(struct sljit_compiler *compiler)
{
sljit_s32 kept_saveds_count = SLJIT_KEPT_SAVEDS_COUNT(compiler->options);
sljit_s32 saveds;
sljit_uw size;
sljit_u8 *inst;
BINARY_IMM32(ADD, compiler->local_size, SLJIT_SP, 0);
size = (sljit_uw)((compiler->scratches > 9 ? (compiler->scratches - 9) : 0) +
(compiler->saveds <= 3 ? compiler->saveds : 3) - kept_saveds_count);
if (!(compiler->options & SLJIT_ENTER_REG_ARG))
size++;
if (size == 0)
return SLJIT_SUCCESS;
inst = (sljit_u8*)ensure_buf(compiler, 1 + size);
FAIL_IF(!inst);
INC_SIZE(size);
saveds = compiler->saveds;
if ((saveds > 0 && kept_saveds_count == 0) || compiler->scratches > 11)
POP_REG(reg_map[SLJIT_S0]);
if ((saveds > 1 && kept_saveds_count <= 1) || compiler->scratches > 10)
POP_REG(reg_map[SLJIT_S1]);
if ((saveds > 2 && kept_saveds_count <= 2) || compiler->scratches > 9)
POP_REG(reg_map[SLJIT_S2]);
if (!(compiler->options & SLJIT_ENTER_REG_ARG))
POP_REG(reg_map[TMP_REG1]);
return SLJIT_SUCCESS;
}
SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_return_void(struct sljit_compiler *compiler)
{
sljit_u8 *inst;
CHECK_ERROR();
CHECK(check_sljit_emit_return_void(compiler));
SLJIT_ASSERT(compiler->args_size >= 0);
SLJIT_ASSERT(compiler->local_size > 0);
FAIL_IF(emit_stack_frame_release(compiler));
inst = (sljit_u8*)ensure_buf(compiler, 1 + 1);
FAIL_IF(!inst);
INC_SIZE(1);
RET();
return SLJIT_SUCCESS;
}
/* --------------------------------------------------------------------- */
/* Call / return instructions */
/* --------------------------------------------------------------------- */
static sljit_s32 call_get_stack_size(struct sljit_compiler *compiler, sljit_s32 arg_types, sljit_s32 *word_arg_count_ptr)
{
sljit_sw stack_size = 0;
sljit_s32 word_arg_count = 0;
arg_types >>= SLJIT_ARG_SHIFT;
while (arg_types) {
switch (arg_types & SLJIT_ARG_MASK) {
case SLJIT_ARG_TYPE_F64:
stack_size += SSIZE_OF(f64);
break;
case SLJIT_ARG_TYPE_F32:
stack_size += SSIZE_OF(f32);
break;
default:
word_arg_count++;
stack_size += SSIZE_OF(sw);
break;
}
arg_types >>= SLJIT_ARG_SHIFT;
}
if (word_arg_count_ptr)
*word_arg_count_ptr = word_arg_count;
if (stack_size <= compiler->scratches_offset)
return 0;
return ((stack_size - compiler->scratches_offset + 0xf) & ~0xf);
}
static sljit_s32 call_with_args(struct sljit_compiler *compiler,
sljit_s32 arg_types, sljit_sw stack_size, sljit_s32 word_arg_count)
{
sljit_s32 float_arg_count = 0;
sljit_u8 *inst;
if (word_arg_count >= 4)
EMIT_MOV(compiler, TMP_REG1, 0, SLJIT_MEM1(SLJIT_SP), compiler->scratches_offset);
if (stack_size > 0)
BINARY_IMM32(SUB, stack_size, SLJIT_SP, 0);
stack_size = 0;
word_arg_count = 0;
arg_types >>= SLJIT_ARG_SHIFT;
while (arg_types) {
switch (arg_types & SLJIT_ARG_MASK) {
case SLJIT_ARG_TYPE_F64:
float_arg_count++;
FAIL_IF(emit_sse2_store(compiler, 0, SLJIT_MEM1(SLJIT_SP), stack_size, float_arg_count));
stack_size += SSIZE_OF(f64);
break;
case SLJIT_ARG_TYPE_F32:
float_arg_count++;
FAIL_IF(emit_sse2_store(compiler, 1, SLJIT_MEM1(SLJIT_SP), stack_size, float_arg_count));
stack_size += SSIZE_OF(f32);
break;
default:
word_arg_count++;
EMIT_MOV(compiler, SLJIT_MEM1(SLJIT_SP), stack_size, (word_arg_count >= 4) ? TMP_REG1 : word_arg_count, 0);
stack_size += SSIZE_OF(sw);
break;
}
arg_types >>= SLJIT_ARG_SHIFT;
}
return SLJIT_SUCCESS;
}
static sljit_s32 post_call_with_args(struct sljit_compiler *compiler,
sljit_s32 arg_types, sljit_s32 stack_size)
{
sljit_u8 *inst;
sljit_s32 single;
if (stack_size > 0)
BINARY_IMM32(ADD, stack_size, SLJIT_SP, 0);
if ((arg_types & SLJIT_ARG_MASK) < SLJIT_ARG_TYPE_F64)
return SLJIT_SUCCESS;
single = ((arg_types & SLJIT_ARG_MASK) == SLJIT_ARG_TYPE_F32);
inst = (sljit_u8*)ensure_buf(compiler, 1 + 3);
FAIL_IF(!inst);
INC_SIZE(3);
inst[0] = single ? FSTPS : FSTPD;
inst[1] = (0x03 << 3) | 0x04;
inst[2] = (0x04 << 3) | reg_map[SLJIT_SP];
return emit_sse2_load(compiler, single, SLJIT_FR0, SLJIT_MEM1(SLJIT_SP), 0);
}
static sljit_s32 tail_call_with_args(struct sljit_compiler *compiler,
sljit_s32 *extra_space, sljit_s32 arg_types,
sljit_s32 src, sljit_sw srcw)
{
sljit_sw args_size, saved_regs_size;
sljit_sw types, word_arg_count, float_arg_count;
sljit_sw stack_size, prev_stack_size, min_size, offset;
sljit_sw word_arg4_offset;
sljit_u8 r2_offset = 0;
sljit_s32 kept_saveds_count = SLJIT_KEPT_SAVEDS_COUNT(compiler->options);
sljit_u8* inst;
ADJUST_LOCAL_OFFSET(src, srcw);
CHECK_EXTRA_REGS(src, srcw, (void)0);
saved_regs_size = (1 + (compiler->scratches > 9 ? (compiler->scratches - 9) : 0)
+ (compiler->saveds <= 3 ? compiler->saveds : 3) - kept_saveds_count) * SSIZE_OF(sw);
word_arg_count = 0;
float_arg_count = 0;
arg_types >>= SLJIT_ARG_SHIFT;
types = 0;
args_size = 0;
while (arg_types != 0) {
types = (types << SLJIT_ARG_SHIFT) | (arg_types & SLJIT_ARG_MASK);
switch (arg_types & SLJIT_ARG_MASK) {
case SLJIT_ARG_TYPE_F64:
args_size += SSIZE_OF(f64);
float_arg_count++;
break;
case SLJIT_ARG_TYPE_F32:
args_size += SSIZE_OF(f32);
float_arg_count++;
break;
default:
word_arg_count++;
args_size += SSIZE_OF(sw);
break;
}
arg_types >>= SLJIT_ARG_SHIFT;
}
if (args_size <= compiler->args_size) {
*extra_space = 0;
stack_size = args_size + SSIZE_OF(sw) + saved_regs_size;
offset = stack_size + compiler->local_size;
if (!(src & SLJIT_IMM) && src != SLJIT_R0) {
if (word_arg_count >= 1) {
EMIT_MOV(compiler, SLJIT_MEM1(SLJIT_SP), 0, SLJIT_R0, 0);
r2_offset = sizeof(sljit_sw);
}
EMIT_MOV(compiler, SLJIT_R0, 0, src, srcw);
}
while (types != 0) {
switch (types & SLJIT_ARG_MASK) {
case SLJIT_ARG_TYPE_F64:
offset -= SSIZE_OF(f64);
FAIL_IF(emit_sse2_store(compiler, 0, SLJIT_MEM1(SLJIT_SP), offset, float_arg_count));
float_arg_count--;
break;
case SLJIT_ARG_TYPE_F32:
offset -= SSIZE_OF(f32);
FAIL_IF(emit_sse2_store(compiler, 0, SLJIT_MEM1(SLJIT_SP), offset, float_arg_count));
float_arg_count--;
break;
default:
switch (word_arg_count) {
case 1:
offset -= SSIZE_OF(sw);
if (r2_offset != 0) {
EMIT_MOV(compiler, SLJIT_R2, 0, SLJIT_MEM1(SLJIT_SP), 0);
EMIT_MOV(compiler, SLJIT_MEM1(SLJIT_SP), offset, SLJIT_R2, 0);
} else
EMIT_MOV(compiler, SLJIT_MEM1(SLJIT_SP), offset, SLJIT_R0, 0);
break;
case 2:
offset -= SSIZE_OF(sw);
EMIT_MOV(compiler, SLJIT_MEM1(SLJIT_SP), offset, SLJIT_R1, 0);
break;
case 3:
offset -= SSIZE_OF(sw);
break;
case 4:
offset -= SSIZE_OF(sw);
EMIT_MOV(compiler, SLJIT_R2, 0, SLJIT_MEM1(SLJIT_SP), compiler->scratches_offset);
EMIT_MOV(compiler, SLJIT_MEM1(SLJIT_SP), offset, SLJIT_R2, 0);
break;
}
word_arg_count--;
break;
}
types >>= SLJIT_ARG_SHIFT;
}
return emit_stack_frame_release(compiler);
}
stack_size = args_size + SSIZE_OF(sw);
if (word_arg_count >= 1 && !(src & SLJIT_IMM) && src != SLJIT_R0) {
r2_offset = SSIZE_OF(sw);
stack_size += SSIZE_OF(sw);
}
if (word_arg_count >= 3)
stack_size += SSIZE_OF(sw);
prev_stack_size = SSIZE_OF(sw) + saved_regs_size;
min_size = prev_stack_size + compiler->local_size;
word_arg4_offset = compiler->scratches_offset;
if (stack_size > min_size) {
BINARY_IMM32(SUB, stack_size - min_size, SLJIT_SP, 0);
if (src == SLJIT_MEM1(SLJIT_SP))
srcw += stack_size - min_size;
word_arg4_offset += stack_size - min_size;
}
else
stack_size = min_size;
if (word_arg_count >= 3) {
EMIT_MOV(compiler, SLJIT_MEM1(SLJIT_SP), r2_offset, SLJIT_R2, 0);
if (word_arg_count >= 4)
EMIT_MOV(compiler, SLJIT_R2, 0, SLJIT_MEM1(SLJIT_SP), word_arg4_offset);
}
if (!(src & SLJIT_IMM) && src != SLJIT_R0) {
if (word_arg_count >= 1) {
SLJIT_ASSERT(r2_offset == sizeof(sljit_sw));
EMIT_MOV(compiler, SLJIT_MEM1(SLJIT_SP), 0, SLJIT_R0, 0);
}
EMIT_MOV(compiler, SLJIT_R0, 0, src, srcw);
}
/* Restore saved registers. */
offset = stack_size - 2 * SSIZE_OF(sw);
EMIT_MOV(compiler, TMP_REG1, 0, SLJIT_MEM1(SLJIT_SP), offset);
if (compiler->saveds > 2 || compiler->scratches > 9) {
offset -= SSIZE_OF(sw);
EMIT_MOV(compiler, SLJIT_S2, 0, SLJIT_MEM1(SLJIT_SP), offset);
}
if ((compiler->saveds > 1 && kept_saveds_count <= 1) || compiler->scratches > 10) {
offset -= SSIZE_OF(sw);
EMIT_MOV(compiler, SLJIT_S1, 0, SLJIT_MEM1(SLJIT_SP), offset);
}
if ((compiler->saveds > 0 && kept_saveds_count == 0) || compiler->scratches > 11) {
offset -= SSIZE_OF(sw);
EMIT_MOV(compiler, SLJIT_S0, 0, SLJIT_MEM1(SLJIT_SP), offset);
}
/* Copy fourth argument and return address. */
offset = stack_size - SSIZE_OF(sw);
*extra_space = args_size;
if (word_arg_count >= 4) {
offset -= SSIZE_OF(sw);
EMIT_MOV(compiler, SLJIT_MEM1(SLJIT_SP), offset, SLJIT_R2, 0);
}
while (types != 0) {
switch (types & SLJIT_ARG_MASK) {
case SLJIT_ARG_TYPE_F64:
offset -= SSIZE_OF(f64);
FAIL_IF(emit_sse2_store(compiler, 0, SLJIT_MEM1(SLJIT_SP), offset, float_arg_count));
float_arg_count--;
break;
case SLJIT_ARG_TYPE_F32:
offset -= SSIZE_OF(f32);
FAIL_IF(emit_sse2_store(compiler, 0, SLJIT_MEM1(SLJIT_SP), offset, float_arg_count));
float_arg_count--;
break;
default:
switch (word_arg_count) {
case 1:
offset -= SSIZE_OF(sw);
if (r2_offset != 0) {
EMIT_MOV(compiler, SLJIT_R2, 0, SLJIT_MEM1(SLJIT_SP), 0);
EMIT_MOV(compiler, SLJIT_MEM1(SLJIT_SP), offset, SLJIT_R2, 0);
} else
EMIT_MOV(compiler, SLJIT_MEM1(SLJIT_SP), offset, SLJIT_R0, 0);
break;
case 2:
offset -= SSIZE_OF(sw);
EMIT_MOV(compiler, SLJIT_MEM1(SLJIT_SP), offset, SLJIT_R1, 0);
break;
case 3:
offset -= SSIZE_OF(sw);
EMIT_MOV(compiler, SLJIT_R2, 0, SLJIT_MEM1(SLJIT_SP), r2_offset);
EMIT_MOV(compiler, SLJIT_MEM1(SLJIT_SP), offset, SLJIT_R2, 0);
break;
}
word_arg_count--;
break;
}
types >>= SLJIT_ARG_SHIFT;
}
SLJIT_ASSERT(offset >= 0);
if (offset == 0)
return SLJIT_SUCCESS;
BINARY_IMM32(ADD, offset, SLJIT_SP, 0);
return SLJIT_SUCCESS;
}
static sljit_s32 emit_tail_call_end(struct sljit_compiler *compiler, sljit_s32 extra_space)
{
/* Called when stack consumption cannot be reduced to 0. */
sljit_u8 *inst;
BINARY_IMM32(ADD, extra_space, SLJIT_SP, 0);
inst = (sljit_u8*)ensure_buf(compiler, 1 + 1);
FAIL_IF(!inst);
INC_SIZE(1);
RET();
return SLJIT_SUCCESS;
}
static sljit_s32 call_reg_arg_with_args(struct sljit_compiler *compiler, sljit_s32 arg_types, sljit_s32 is_tail)
{
sljit_s32 word_arg_count = 0;
sljit_s32 kept_saveds_count, offset;
arg_types >>= SLJIT_ARG_SHIFT;
while (arg_types) {
if ((arg_types & SLJIT_ARG_MASK) < SLJIT_ARG_TYPE_F64)
word_arg_count++;
arg_types >>= SLJIT_ARG_SHIFT;
}
if (word_arg_count < 4)
return SLJIT_SUCCESS;
EMIT_MOV(compiler, TMP_REG1, 0, SLJIT_MEM1(SLJIT_SP), compiler->scratches_offset);
if (!is_tail)
return emit_mov(compiler, SLJIT_MEM1(SLJIT_SP), 0, TMP_REG1, 0);
kept_saveds_count = SLJIT_KEPT_SAVEDS_COUNT(compiler->options);
offset = compiler->local_size + SSIZE_OF(sw);
if ((compiler->saveds > 0 && kept_saveds_count == 0) || compiler->scratches > 11)
offset += SSIZE_OF(sw);
if ((compiler->saveds > 1 && kept_saveds_count <= 1) || compiler->scratches > 10)
offset += SSIZE_OF(sw);
if ((compiler->saveds > 2 && kept_saveds_count <= 2) || compiler->scratches > 9)
offset += SSIZE_OF(sw);
return emit_mov(compiler, SLJIT_MEM1(SLJIT_SP), offset, TMP_REG1, 0);
}
SLJIT_API_FUNC_ATTRIBUTE struct sljit_jump* sljit_emit_call(struct sljit_compiler *compiler, sljit_s32 type,
sljit_s32 arg_types)
{
struct sljit_jump *jump;
sljit_sw stack_size = 0;
sljit_s32 word_arg_count;
CHECK_ERROR_PTR();
CHECK_PTR(check_sljit_emit_call(compiler, type, arg_types));
if (type & SLJIT_CALL_RETURN) {
if ((type & 0xff) == SLJIT_CALL_REG_ARG) {
PTR_FAIL_IF(call_reg_arg_with_args(compiler, arg_types, 1));
PTR_FAIL_IF(emit_stack_frame_release(compiler));
SLJIT_SKIP_CHECKS(compiler);
return sljit_emit_jump(compiler, SLJIT_JUMP | (type & SLJIT_REWRITABLE_JUMP));
}
stack_size = type;
PTR_FAIL_IF(tail_call_with_args(compiler, &stack_size, arg_types, SLJIT_IMM, 0));
SLJIT_SKIP_CHECKS(compiler);
if (stack_size == 0)
return sljit_emit_jump(compiler, SLJIT_JUMP | (type & SLJIT_REWRITABLE_JUMP));
jump = sljit_emit_jump(compiler, type);
PTR_FAIL_IF(jump == NULL);
PTR_FAIL_IF(emit_tail_call_end(compiler, stack_size));
return jump;
}
if ((type & 0xff) == SLJIT_CALL_REG_ARG) {
PTR_FAIL_IF(call_reg_arg_with_args(compiler, arg_types, 0));
SLJIT_SKIP_CHECKS(compiler);
return sljit_emit_jump(compiler, type);
}
stack_size = call_get_stack_size(compiler, arg_types, &word_arg_count);
PTR_FAIL_IF(call_with_args(compiler, arg_types, stack_size, word_arg_count));
SLJIT_SKIP_CHECKS(compiler);
jump = sljit_emit_jump(compiler, type);
PTR_FAIL_IF(jump == NULL);
PTR_FAIL_IF(post_call_with_args(compiler, arg_types, stack_size));
return jump;
}
SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_icall(struct sljit_compiler *compiler, sljit_s32 type,
sljit_s32 arg_types,
sljit_s32 src, sljit_sw srcw)
{
sljit_sw stack_size = 0;
sljit_s32 word_arg_count;
CHECK_ERROR();
CHECK(check_sljit_emit_icall(compiler, type, arg_types, src, srcw));
if (type & SLJIT_CALL_RETURN) {
if ((type & 0xff) == SLJIT_CALL_REG_ARG) {
FAIL_IF(call_reg_arg_with_args(compiler, arg_types, 1));
if ((src & SLJIT_MEM) || (src >= SLJIT_FIRST_SAVED_REG && src <= SLJIT_S0)) {
ADJUST_LOCAL_OFFSET(src, srcw);
CHECK_EXTRA_REGS(src, srcw, (void)0);
EMIT_MOV(compiler, TMP_REG1, 0, src, srcw);
src = TMP_REG1;
srcw = 0;
}
FAIL_IF(emit_stack_frame_release(compiler));
SLJIT_SKIP_CHECKS(compiler);
return sljit_emit_ijump(compiler, SLJIT_JUMP, src, srcw);
}
stack_size = type;
FAIL_IF(tail_call_with_args(compiler, &stack_size, arg_types, src, srcw));
if (!(src & SLJIT_IMM)) {
src = SLJIT_R0;
srcw = 0;
}
SLJIT_SKIP_CHECKS(compiler);
if (stack_size == 0)
return sljit_emit_ijump(compiler, SLJIT_JUMP, src, srcw);
FAIL_IF(sljit_emit_ijump(compiler, type, src, srcw));
return emit_tail_call_end(compiler, stack_size);
}
if ((type & 0xff) == SLJIT_CALL_REG_ARG) {
FAIL_IF(call_reg_arg_with_args(compiler, arg_types, 0));
SLJIT_SKIP_CHECKS(compiler);
return sljit_emit_ijump(compiler, type, src, srcw);
}
stack_size = call_get_stack_size(compiler, arg_types, &word_arg_count);
FAIL_IF(call_with_args(compiler, arg_types, stack_size, word_arg_count));
compiler->scratches_offset += stack_size;
compiler->locals_offset += stack_size;
SLJIT_SKIP_CHECKS(compiler);
FAIL_IF(sljit_emit_ijump(compiler, type, src, srcw));
compiler->scratches_offset -= stack_size;
compiler->locals_offset -= stack_size;
return post_call_with_args(compiler, arg_types, stack_size);
}
SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_fast_enter(struct sljit_compiler *compiler, sljit_s32 dst, sljit_sw dstw)
{
sljit_u8 *inst;
CHECK_ERROR();
CHECK(check_sljit_emit_fast_enter(compiler, dst, dstw));
ADJUST_LOCAL_OFFSET(dst, dstw);
CHECK_EXTRA_REGS(dst, dstw, (void)0);
if (FAST_IS_REG(dst)) {
/* Unused dest is possible here. */
inst = (sljit_u8*)ensure_buf(compiler, 1 + 1);
FAIL_IF(!inst);
INC_SIZE(1);
POP_REG(reg_map[dst]);
return SLJIT_SUCCESS;
}
/* Memory. */
inst = emit_x86_instruction(compiler, 1, 0, 0, dst, dstw);
FAIL_IF(!inst);
*inst++ = POP_rm;
return SLJIT_SUCCESS;
}
static sljit_s32 emit_fast_return(struct sljit_compiler *compiler, sljit_s32 src, sljit_sw srcw)
{
sljit_u8 *inst;
CHECK_EXTRA_REGS(src, srcw, (void)0);
if (FAST_IS_REG(src)) {
inst = (sljit_u8*)ensure_buf(compiler, 1 + 1 + 1);
FAIL_IF(!inst);
INC_SIZE(1 + 1);
PUSH_REG(reg_map[src]);
}
else {
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);
}
RET();
return SLJIT_SUCCESS;
}
static sljit_s32 skip_frames_before_return(struct sljit_compiler *compiler)
{
sljit_sw size;
/* Don't adjust shadow stack if it isn't enabled. */
if (!cpu_has_shadow_stack())
return SLJIT_SUCCESS;
SLJIT_ASSERT(compiler->args_size >= 0);
SLJIT_ASSERT(compiler->local_size > 0);
size = compiler->local_size;
size += (1 + (compiler->scratches > 9 ? (compiler->scratches - 9) : 0)
+ (compiler->saveds <= 3 ? compiler->saveds : 3)) * SSIZE_OF(sw);
return adjust_shadow_stack(compiler, SLJIT_MEM1(SLJIT_SP), size);
}
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