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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.
*/
/* mips 32-bit arch dependent functions. */
static sljit_s32 load_immediate(struct sljit_compiler *compiler, sljit_s32 dst_ar, sljit_sw imm)
{
if (!(imm & ~0xffff))
return push_inst(compiler, ORI | SA(0) | TA(dst_ar) | IMM(imm), dst_ar);
if (imm < 0 && imm >= SIMM_MIN)
return push_inst(compiler, ADDIU | SA(0) | TA(dst_ar) | IMM(imm), dst_ar);
FAIL_IF(push_inst(compiler, LUI | TA(dst_ar) | IMM(imm >> 16), dst_ar));
return (imm & 0xffff) ? push_inst(compiler, ORI | SA(dst_ar) | TA(dst_ar) | IMM(imm), dst_ar) : SLJIT_SUCCESS;
}
static SLJIT_INLINE sljit_s32 emit_const(struct sljit_compiler *compiler, sljit_s32 dst, sljit_sw init_value)
{
FAIL_IF(push_inst(compiler, LUI | T(dst) | IMM(init_value >> 16), DR(dst)));
return push_inst(compiler, ORI | S(dst) | T(dst) | IMM(init_value), DR(dst));
}
SLJIT_API_FUNC_ATTRIBUTE void sljit_set_jump_addr(sljit_uw addr, sljit_uw new_target, sljit_sw executable_offset)
{
sljit_ins *inst = (sljit_ins *)addr;
SLJIT_UNUSED_ARG(executable_offset);
SLJIT_UPDATE_WX_FLAGS(inst, inst + 2, 0);
SLJIT_ASSERT((inst[0] & 0xffe00000) == LUI && (inst[1] & 0xfc000000) == ORI);
inst[0] = (inst[0] & 0xffff0000) | ((new_target >> 16) & 0xffff);
inst[1] = (inst[1] & 0xffff0000) | (new_target & 0xffff);
SLJIT_UPDATE_WX_FLAGS(inst, inst + 2, 1);
inst = (sljit_ins *)SLJIT_ADD_EXEC_OFFSET(inst, executable_offset);
SLJIT_CACHE_FLUSH(inst, inst + 2);
}
SLJIT_API_FUNC_ATTRIBUTE void sljit_set_const(sljit_uw addr, sljit_sw new_constant, sljit_sw executable_offset)
{
sljit_set_jump_addr(addr, (sljit_uw)new_constant, executable_offset);
}
static sljit_s32 call_with_args(struct sljit_compiler *compiler, sljit_s32 arg_types, sljit_ins *ins_ptr, sljit_u32 *extra_space)
{
sljit_u32 is_tail_call = *extra_space & SLJIT_CALL_RETURN;
sljit_u32 offset = 0;
sljit_s32 float_arg_count = 0;
sljit_s32 word_arg_count = 0;
sljit_s32 types = 0;
sljit_ins prev_ins = NOP;
sljit_ins ins = NOP;
sljit_u8 offsets[4];
sljit_u8 *offsets_ptr = offsets;
SLJIT_ASSERT(reg_map[TMP_REG1] == 4 && freg_map[TMP_FREG1] == 12);
arg_types >>= SLJIT_ARG_SHIFT;
/* See ABI description in sljit_emit_enter. */
while (arg_types) {
types = (types << SLJIT_ARG_SHIFT) | (arg_types & SLJIT_ARG_MASK);
*offsets_ptr = (sljit_u8)offset;
switch (arg_types & SLJIT_ARG_MASK) {
case SLJIT_ARG_TYPE_F64:
if (offset & 0x7) {
offset += sizeof(sljit_sw);
*offsets_ptr = (sljit_u8)offset;
}
if (word_arg_count == 0 && float_arg_count <= 1)
*offsets_ptr = (sljit_u8)(254 + float_arg_count);
offset += sizeof(sljit_f64);
float_arg_count++;
break;
case SLJIT_ARG_TYPE_F32:
if (word_arg_count == 0 && float_arg_count <= 1)
*offsets_ptr = (sljit_u8)(254 + float_arg_count);
offset += sizeof(sljit_f32);
float_arg_count++;
break;
default:
offset += sizeof(sljit_sw);
word_arg_count++;
break;
}
arg_types >>= SLJIT_ARG_SHIFT;
offsets_ptr++;
}
/* Stack is aligned to 16 bytes. */
SLJIT_ASSERT(offset <= 8 * sizeof(sljit_sw));
if (offset > 4 * sizeof(sljit_sw) && (!is_tail_call || offset > compiler->args_size)) {
if (is_tail_call) {
offset = (offset + sizeof(sljit_sw) + 15) & ~(sljit_uw)0xf;
FAIL_IF(emit_stack_frame_release(compiler, (sljit_s32)offset, &prev_ins));
*extra_space = offset;
} else {
FAIL_IF(push_inst(compiler, ADDIU | S(SLJIT_SP) | T(SLJIT_SP) | IMM(-16), DR(SLJIT_SP)));
*extra_space = 16;
}
} else {
if (is_tail_call)
FAIL_IF(emit_stack_frame_release(compiler, 0, &prev_ins));
*extra_space = 0;
}
while (types) {
--offsets_ptr;
switch (types & SLJIT_ARG_MASK) {
case SLJIT_ARG_TYPE_F64:
if (*offsets_ptr < 4 * sizeof (sljit_sw)) {
if (prev_ins != NOP)
FAIL_IF(push_inst(compiler, prev_ins, MOVABLE_INS));
/* Must be preceded by at least one other argument,
* and its starting offset must be 8 because of alignment. */
SLJIT_ASSERT((*offsets_ptr >> 2) == 2);
prev_ins = MFC1 | TA(6) | FS(float_arg_count) | (1 << 11);
ins = MFC1 | TA(7) | FS(float_arg_count);
} else if (*offsets_ptr < 254)
ins = SDC1 | S(SLJIT_SP) | FT(float_arg_count) | IMM(*offsets_ptr);
else if (*offsets_ptr == 254)
ins = MOV_S | FMT_D | FS(SLJIT_FR0) | FD(TMP_FREG1);
float_arg_count--;
break;
case SLJIT_ARG_TYPE_F32:
if (*offsets_ptr < 4 * sizeof (sljit_sw))
ins = MFC1 | TA(4 + (*offsets_ptr >> 2)) | FS(float_arg_count);
else if (*offsets_ptr < 254)
ins = SWC1 | S(SLJIT_SP) | FT(float_arg_count) | IMM(*offsets_ptr);
else if (*offsets_ptr == 254)
ins = MOV_S | FMT_S | FS(SLJIT_FR0) | FD(TMP_FREG1);
float_arg_count--;
break;
default:
if (*offsets_ptr >= 4 * sizeof (sljit_sw))
ins = SW | S(SLJIT_SP) | T(word_arg_count) | IMM(*offsets_ptr);
else if ((*offsets_ptr >> 2) != word_arg_count - 1)
ins = ADDU | S(word_arg_count) | TA(0) | DA(4 + (*offsets_ptr >> 2));
else if (*offsets_ptr == 0)
ins = ADDU | S(SLJIT_R0) | TA(0) | DA(4);
word_arg_count--;
break;
}
if (ins != NOP) {
if (prev_ins != NOP)
FAIL_IF(push_inst(compiler, prev_ins, MOVABLE_INS));
prev_ins = ins;
ins = NOP;
}
types >>= SLJIT_ARG_SHIFT;
}
*ins_ptr = prev_ins;
return SLJIT_SUCCESS;
}
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_u32 extra_space = 0;
sljit_ins ins = NOP;
CHECK_ERROR_PTR();
CHECK_PTR(check_sljit_emit_call(compiler, type, arg_types));
jump = (struct sljit_jump*)ensure_abuf(compiler, sizeof(struct sljit_jump));
PTR_FAIL_IF(!jump);
set_jump(jump, compiler, type & SLJIT_REWRITABLE_JUMP);
if ((type & 0xff) != SLJIT_CALL_REG_ARG) {
extra_space = (sljit_u32)type;
PTR_FAIL_IF(call_with_args(compiler, arg_types, &ins, &extra_space));
} else if (type & SLJIT_CALL_RETURN)
PTR_FAIL_IF(emit_stack_frame_release(compiler, 0, &ins));
SLJIT_ASSERT(DR(PIC_ADDR_REG) == 25 && PIC_ADDR_REG == TMP_REG2);
if (ins == NOP && compiler->delay_slot != UNMOVABLE_INS)
jump->flags |= IS_MOVABLE;
if (!(type & SLJIT_CALL_RETURN) || extra_space > 0) {
jump->flags |= IS_JAL;
if ((type & 0xff) != SLJIT_CALL_REG_ARG)
jump->flags |= IS_CALL;
PTR_FAIL_IF(push_inst(compiler, JALR | S(PIC_ADDR_REG) | DA(RETURN_ADDR_REG), UNMOVABLE_INS));
} else
PTR_FAIL_IF(push_inst(compiler, JR | S(PIC_ADDR_REG), UNMOVABLE_INS));
jump->addr = compiler->size;
PTR_FAIL_IF(push_inst(compiler, ins, UNMOVABLE_INS));
/* Maximum number of instructions required for generating a constant. */
compiler->size += 2;
if (extra_space == 0)
return jump;
if (type & SLJIT_CALL_RETURN)
PTR_FAIL_IF(emit_op_mem(compiler, WORD_DATA | LOAD_DATA, RETURN_ADDR_REG,
SLJIT_MEM1(SLJIT_SP), (sljit_sw)(extra_space - sizeof(sljit_sw))));
if (type & SLJIT_CALL_RETURN)
PTR_FAIL_IF(push_inst(compiler, JR | SA(RETURN_ADDR_REG), UNMOVABLE_INS));
PTR_FAIL_IF(push_inst(compiler, ADDIU | S(SLJIT_SP) | T(SLJIT_SP) | IMM(extra_space),
(type & SLJIT_CALL_RETURN) ? UNMOVABLE_INS : DR(SLJIT_SP)));
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_u32 extra_space = (sljit_u32)type;
sljit_ins ins;
CHECK_ERROR();
CHECK(check_sljit_emit_icall(compiler, type, arg_types, src, srcw));
if (src & SLJIT_MEM) {
ADJUST_LOCAL_OFFSET(src, srcw);
FAIL_IF(emit_op_mem(compiler, WORD_DATA | LOAD_DATA, DR(PIC_ADDR_REG), src, srcw));
src = PIC_ADDR_REG;
srcw = 0;
}
if ((type & 0xff) == SLJIT_CALL_REG_ARG) {
if (type & SLJIT_CALL_RETURN) {
if (src >= SLJIT_FIRST_SAVED_REG && src <= (SLJIT_S0 - SLJIT_KEPT_SAVEDS_COUNT(compiler->options))) {
FAIL_IF(push_inst(compiler, ADDU | S(src) | TA(0) | D(PIC_ADDR_REG), DR(PIC_ADDR_REG)));
src = PIC_ADDR_REG;
srcw = 0;
}
FAIL_IF(emit_stack_frame_release(compiler, 0, &ins));
if (ins != NOP)
FAIL_IF(push_inst(compiler, ins, MOVABLE_INS));
}
SLJIT_SKIP_CHECKS(compiler);
return sljit_emit_ijump(compiler, type, src, srcw);
}
SLJIT_ASSERT(DR(PIC_ADDR_REG) == 25 && PIC_ADDR_REG == TMP_REG2);
if (src & SLJIT_IMM)
FAIL_IF(load_immediate(compiler, DR(PIC_ADDR_REG), srcw));
else if (src != PIC_ADDR_REG)
FAIL_IF(push_inst(compiler, ADDU | S(src) | TA(0) | D(PIC_ADDR_REG), DR(PIC_ADDR_REG)));
FAIL_IF(call_with_args(compiler, arg_types, &ins, &extra_space));
/* Register input. */
if (!(type & SLJIT_CALL_RETURN) || extra_space > 0)
FAIL_IF(push_inst(compiler, JALR | S(PIC_ADDR_REG) | DA(RETURN_ADDR_REG), UNMOVABLE_INS));
else
FAIL_IF(push_inst(compiler, JR | S(PIC_ADDR_REG), UNMOVABLE_INS));
FAIL_IF(push_inst(compiler, ins, UNMOVABLE_INS));
if (extra_space == 0)
return SLJIT_SUCCESS;
if (type & SLJIT_CALL_RETURN)
FAIL_IF(emit_op_mem(compiler, WORD_DATA | LOAD_DATA, RETURN_ADDR_REG,
SLJIT_MEM1(SLJIT_SP), (sljit_sw)(extra_space - sizeof(sljit_sw))));
if (type & SLJIT_CALL_RETURN)
FAIL_IF(push_inst(compiler, JR | SA(RETURN_ADDR_REG), UNMOVABLE_INS));
return push_inst(compiler, ADDIU | S(SLJIT_SP) | T(SLJIT_SP) | IMM(extra_space),
(type & SLJIT_CALL_RETURN) ? UNMOVABLE_INS : DR(SLJIT_SP));
}
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