sljitNativeMIPS_64.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.
 */
 
/* mips 64-bit arch dependent functions. */
 
static sljit_s32 emit_copysign(struct sljit_compiler *compiler, sljit_s32 op,
        sljit_s32 src1, sljit_s32 src2, sljit_s32 dst)
{
    FAIL_IF(push_inst(compiler, SELECT_OP(DMFC1, MFC1) | T(TMP_REG1) | FS(src1), DR(TMP_REG1)));
    FAIL_IF(push_inst(compiler, SELECT_OP(DMFC1, MFC1) | T(TMP_REG2) | FS(src2), DR(TMP_REG2)));
    FAIL_IF(push_inst(compiler, XOR | S(TMP_REG2) | T(TMP_REG1) | D(TMP_REG2), DR(TMP_REG2)));
    FAIL_IF(push_inst(compiler, SELECT_OP(DSRL32, SRL) | T(TMP_REG2) | D(TMP_REG2) | SH_IMM(31), DR(TMP_REG2)));
    FAIL_IF(push_inst(compiler, SELECT_OP(DSLL32, SLL) | T(TMP_REG2) | D(TMP_REG2) | SH_IMM(31), DR(TMP_REG2)));
    FAIL_IF(push_inst(compiler, XOR | S(TMP_REG1) | T(TMP_REG2) | D(TMP_REG1), DR(TMP_REG1)));
    FAIL_IF(push_inst(compiler, SELECT_OP(DMTC1, MTC1) | T(TMP_REG1) | FS(dst), MOVABLE_INS));
#if !defined(SLJIT_MIPS_REV) || SLJIT_MIPS_REV <= 1
    if (!(op & SLJIT_32))
        return push_inst(compiler, NOP, UNMOVABLE_INS);
#endif /* MIPS III */
    return SLJIT_SUCCESS;
}
 
static sljit_s32 load_immediate(struct sljit_compiler *compiler, sljit_s32 dst_ar, sljit_sw imm)
{
    sljit_s32 shift = 32;
    sljit_s32 shift2;
    sljit_s32 inv = 0;
    sljit_ins ins;
    sljit_uw uimm;
 
    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);
 
    if (imm <= 0x7fffffffl && imm >= -0x80000000l) {
        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;
    }
 
    /* Zero extended number. */
    uimm = (sljit_uw)imm;
    if (imm < 0) {
        uimm = ~(sljit_uw)imm;
        inv = 1;
    }
 
    while (!(uimm & 0xff00000000000000l)) {
        shift -= 8;
        uimm <<= 8;
    }
 
    if (!(uimm & 0xf000000000000000l)) {
        shift -= 4;
        uimm <<= 4;
    }
 
    if (!(uimm & 0xc000000000000000l)) {
        shift -= 2;
        uimm <<= 2;
    }
 
    if ((sljit_sw)uimm < 0) {
        uimm >>= 1;
        shift += 1;
    }
    SLJIT_ASSERT(((uimm & 0xc000000000000000l) == 0x4000000000000000l) && (shift > 0) && (shift <= 32));
 
    if (inv)
        uimm = ~uimm;
 
    FAIL_IF(push_inst(compiler, LUI | TA(dst_ar) | IMM(uimm >> 48), dst_ar));
    if (uimm & 0x0000ffff00000000l)
        FAIL_IF(push_inst(compiler, ORI | SA(dst_ar) | TA(dst_ar) | IMM(uimm >> 32), dst_ar));
 
    imm &= (1l << shift) - 1;
    if (!(imm & ~0xffff)) {
        ins = (shift == 32) ? DSLL32 : DSLL;
        if (shift < 32)
            ins |= SH_IMM(shift);
        FAIL_IF(push_inst(compiler, ins | TA(dst_ar) | DA(dst_ar), dst_ar));
        return !(imm & 0xffff) ? SLJIT_SUCCESS : push_inst(compiler, ORI | SA(dst_ar) | TA(dst_ar) | IMM(imm), dst_ar);
    }
 
    /* Double shifts needs to be performed. */
    uimm <<= 32;
    shift2 = shift - 16;
 
    while (!(uimm & 0xf000000000000000l)) {
        shift2 -= 4;
        uimm <<= 4;
    }
 
    if (!(uimm & 0xc000000000000000l)) {
        shift2 -= 2;
        uimm <<= 2;
    }
 
    if (!(uimm & 0x8000000000000000l)) {
        shift2--;
        uimm <<= 1;
    }
 
    SLJIT_ASSERT((uimm & 0x8000000000000000l) && (shift2 > 0) && (shift2 <= 16));
 
    FAIL_IF(push_inst(compiler, DSLL | TA(dst_ar) | DA(dst_ar) | SH_IMM(shift - shift2), dst_ar));
    FAIL_IF(push_inst(compiler, ORI | SA(dst_ar) | TA(dst_ar) | IMM(uimm >> 48), dst_ar));
    FAIL_IF(push_inst(compiler, DSLL | TA(dst_ar) | DA(dst_ar) | SH_IMM(shift2), dst_ar));
 
    imm &= (1l << shift2) - 1;
    return !(imm & 0xffff) ? SLJIT_SUCCESS : push_inst(compiler, ORI | SA(dst_ar) | TA(dst_ar) | IMM(imm), dst_ar);
}
 
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 >> 48), DR(dst)));
    FAIL_IF(push_inst(compiler, ORI | S(dst) | T(dst) | IMM(init_value >> 32), DR(dst)));
    FAIL_IF(push_inst(compiler, DSLL | T(dst) | D(dst) | SH_IMM(16), DR(dst)));
    FAIL_IF(push_inst(compiler, ORI | S(dst) | T(dst) | IMM(init_value >> 16), DR(dst)));
    FAIL_IF(push_inst(compiler, DSLL | T(dst) | D(dst) | SH_IMM(16), DR(dst)));
    return push_inst(compiler, ORI | S(dst) | T(dst) | IMM(init_value), DR(dst));
}
 
SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_fset64(struct sljit_compiler *compiler,
    sljit_s32 freg, sljit_f64 value)
{
    union {
        sljit_sw imm;
        sljit_f64 value;
    } u;
 
    CHECK_ERROR();
    CHECK(check_sljit_emit_fset64(compiler, freg, value));
 
    u.value = value;
 
    if (u.imm == 0) {
        FAIL_IF(push_inst(compiler, DMTC1 | TA(0) | FS(freg), MOVABLE_INS));
#if !defined(SLJIT_MIPS_REV) || SLJIT_MIPS_REV <= 1
        FAIL_IF(push_inst(compiler, NOP, UNMOVABLE_INS));
#endif /* MIPS III */
        return SLJIT_SUCCESS;
    }
 
    FAIL_IF(load_immediate(compiler, DR(TMP_REG1), u.imm));
    FAIL_IF(push_inst(compiler, DMTC1 | T(TMP_REG1) | FS(freg), MOVABLE_INS));
#if !defined(SLJIT_MIPS_REV) || SLJIT_MIPS_REV <= 1
    FAIL_IF(push_inst(compiler, NOP, UNMOVABLE_INS));
#endif /* MIPS III */
    return SLJIT_SUCCESS;
}
 
SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_fcopy(struct sljit_compiler *compiler, sljit_s32 op,
    sljit_s32 freg, sljit_s32 reg)
{
    sljit_ins inst;
 
    CHECK_ERROR();
    CHECK(check_sljit_emit_fcopy(compiler, op, freg, reg));
 
    inst = T(reg) | FS(freg);
 
    if (GET_OPCODE(op) == SLJIT_COPY_TO_F64)
        FAIL_IF(push_inst(compiler, SELECT_OP(DMTC1, MTC1) | inst, MOVABLE_INS));
    else
        FAIL_IF(push_inst(compiler, SELECT_OP(DMFC1, MFC1) | inst, DR(reg)));
 
#if !defined(SLJIT_MIPS_REV) || SLJIT_MIPS_REV <= 1
    if (!(op & SLJIT_32))
        return push_inst(compiler, NOP, UNMOVABLE_INS);
#endif /* MIPS III */
    return SLJIT_SUCCESS;
}
 
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 + 6, 0);
    inst[0] = (inst[0] & 0xffff0000) | ((sljit_ins)(new_target >> 48) & 0xffff);
    inst[1] = (inst[1] & 0xffff0000) | ((sljit_ins)(new_target >> 32) & 0xffff);
    inst[3] = (inst[3] & 0xffff0000) | ((sljit_ins)(new_target >> 16) & 0xffff);
    inst[5] = (inst[5] & 0xffff0000) | ((sljit_ins)new_target & 0xffff);
    SLJIT_UPDATE_WX_FLAGS(inst, inst + 6, 1);
    inst = (sljit_ins *)SLJIT_ADD_EXEC_OFFSET(inst, executable_offset);
    SLJIT_CACHE_FLUSH(inst, inst + 6);
}
 
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_s32 arg_count = 0;
    sljit_s32 word_arg_count = 0;
    sljit_s32 float_arg_count = 0;
    sljit_s32 types = 0;
    sljit_ins prev_ins = *ins_ptr;
    sljit_ins ins = NOP;
 
    SLJIT_ASSERT(reg_map[TMP_REG2] == 4 && freg_map[TMP_FREG1] == 12);
 
    arg_types >>= SLJIT_ARG_SHIFT;
 
    while (arg_types) {
        types = (types << SLJIT_ARG_SHIFT) | (arg_types & SLJIT_ARG_MASK);
 
        switch (arg_types & SLJIT_ARG_MASK) {
        case SLJIT_ARG_TYPE_F64:
        case SLJIT_ARG_TYPE_F32:
            arg_count++;
            float_arg_count++;
            break;
        default:
            arg_count++;
            word_arg_count++;
            break;
        }
 
        arg_types >>= SLJIT_ARG_SHIFT;
    }
 
    while (types) {
        switch (types & SLJIT_ARG_MASK) {
        case SLJIT_ARG_TYPE_F64:
            if (arg_count != float_arg_count)
                ins = MOV_fmt(FMT_D) | FS(float_arg_count) | FD(arg_count);
            else if (arg_count == 1)
                ins = MOV_fmt(FMT_D) | FS(SLJIT_FR0) | FD(TMP_FREG1);
            arg_count--;
            float_arg_count--;
            break;
        case SLJIT_ARG_TYPE_F32:
            if (arg_count != float_arg_count)
                ins = MOV_fmt(FMT_S) | FS(float_arg_count) | FD(arg_count);
            else if (arg_count == 1)
                ins = MOV_fmt(FMT_S) | FS(SLJIT_FR0) | FD(TMP_FREG1);
            arg_count--;
            float_arg_count--;
            break;
        default:
            if (arg_count != word_arg_count)
                ins = DADDU | S(word_arg_count) | TA(0) | D(arg_count);
            else if (arg_count == 1)
                ins = DADDU | S(SLJIT_R0) | TA(0) | DA(4);
            arg_count--;
            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_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 & SLJIT_CALL_RETURN)
        PTR_FAIL_IF(emit_stack_frame_release(compiler, 0, &ins));
 
    if ((type & 0xff) != SLJIT_CALL_REG_ARG)
        PTR_FAIL_IF(call_with_args(compiler, arg_types, &ins));
 
    SLJIT_ASSERT(DR(PIC_ADDR_REG) == 25);
 
    if (ins == NOP && compiler->delay_slot != UNMOVABLE_INS)
        jump->flags |= IS_MOVABLE;
 
    if (!(type & SLJIT_CALL_RETURN)) {
        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 += 6;
    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_ins ins = NOP;
 
    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, DADDU | 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_REG1);
 
    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, DADDU | S(src) | TA(0) | D(PIC_ADDR_REG), DR(PIC_ADDR_REG)));
 
    if (type & SLJIT_CALL_RETURN)
        FAIL_IF(emit_stack_frame_release(compiler, 0, &ins));
 
    FAIL_IF(call_with_args(compiler, arg_types, &ins));
 
    /* Register input. */
    if (!(type & SLJIT_CALL_RETURN))
        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));
    return push_inst(compiler, ins, UNMOVABLE_INS);
}