dismips.c

来自「开放源码的编译器open watcom 1.6.0版的源代码」· C语言 代码 · 共 677 行 · 第 1/2 页

    code.full = ins->opcode;
    ins->op[0].type = DO_IMMED;
    ins->op[0].value = code.itype.rt;
    ins->op[1].type = DO_REG;
    ins->op[1].base = code.itype.rt + DR_MIPS_r0;
    ins->op[2].type = DO_MEMORY_ABS;
    ins->op[2].value = SEX( code.itype.immediate, 15 );
    ins->op[2].base = code.itype.rs + DR_MIPS_r0;
    ins->num_ops = 3;
    return( DHR_DONE );
}

dis_handler_return MIPSMemory( dis_handle *h, void *d, dis_dec_ins *ins )
{
    mips_ins    code;

    code.full = ins->opcode;
    ins->op[0].type = DO_REG;
    ins->op[0].base = code.itype.rt + DR_MIPS_r0;
    ins->op[1].type = DO_MEMORY_ABS;
    ins->op[1].value = SEX( code.itype.immediate, 15 );
    ins->op[1].base = code.itype.rs + DR_MIPS_r0;
    ins->num_ops = 2;
    switch( code.itype.op & 0x07 ) {
    case 0x0:
    case 0x4:
        ins->op[1].ref_type = DRT_MIPS_BYTE;
        break;
    case 0x1:
    case 0x5:
        ins->op[1].ref_type = DRT_MIPS_HALF;
        break;
    case 0x3:
    case 0x2:  // Left
    case 0x6:  // Right
        ins->op[1].ref_type = DRT_MIPS_WORD;
        break;
    }
    return( DHR_DONE );
}

dis_handler_return MIPSJump1( dis_handle *h, void *d, dis_dec_ins *ins )
{
    mips_ins    code;

    code.full = ins->opcode;
    ins->op[0].type = DO_REG;
    ins->op[0].base = code.rtype.rs + DR_MIPS_r0;
    ins->num_ops = 1;
    return( DHR_DONE );
}

dis_handler_return MIPSJump2( dis_handle *h, void *d, dis_dec_ins *ins )
{
    mips_ins    code;

    code.full = ins->opcode;
    ins->op[0].type = DO_REG;
    ins->op[0].base = code.rtype.rd + DR_MIPS_r0;
    ins->op[1].type = DO_REG;
    ins->op[1].base = code.rtype.rs + DR_MIPS_r0;
    ins->num_ops = 2;
    ins->flags |= DIF_MIPS_LINK;
    return( DHR_DONE );
}

dis_handler_return MIPSBranch1( dis_handle *h, void *d, dis_dec_ins *ins )
{
    mips_ins    code;

    code.full = ins->opcode;
    ins->op[0].type = DO_REG;
    ins->op[0].base = code.itype.rs + DR_MIPS_r0;
    ins->op[1].type = DO_RELATIVE;
    ins->op[1].value = (SEX( code.itype.immediate, 15 ) + 1) * sizeof( unsigned_32 );
    ins->num_ops = 2;
    if( code.itype.rt & 0x10 )
        ins->flags |= DIF_MIPS_LINK;
    if( code.itype.rt & 0x02 )
        ins->flags |= DIF_MIPS_LIKELY;
    return( DHR_DONE );
}

dis_handler_return MIPSBranch2( dis_handle *h, void *d, dis_dec_ins *ins )
{
    mips_ins    code;

    code.full = ins->opcode;
    ins->op[0].type = DO_REG;
    ins->op[0].base = code.itype.rs + DR_MIPS_r0;
    ins->op[1].type = DO_REG;
    ins->op[1].base = code.itype.rt + DR_MIPS_r0;
    ins->op[2].type = DO_RELATIVE;
    ins->op[2].value = (SEX( code.itype.immediate, 15 ) + 1) * sizeof( unsigned_32 );
    ins->num_ops = 3;
    if( code.itype.op & 0x10 )
        ins->flags |= DIF_MIPS_LIKELY;
    return( DHR_DONE );
}

dis_handler_return MIPSBranch3( dis_handle *h, void *d, dis_dec_ins *ins )
{
    mips_ins    code;

    code.full = ins->opcode;
    ins->op[0].type = DO_REG;
    ins->op[0].base = code.itype.rs + DR_MIPS_r0;
    ins->op[1].type = DO_RELATIVE;
    ins->op[1].value = (SEX( code.itype.immediate, 15 ) + 1) * sizeof( unsigned_32 );
    ins->num_ops = 2;
    if( code.itype.op & 0x10 )
        ins->flags |= DIF_MIPS_LIKELY;
    return( DHR_DONE );
}

dis_handler_return MIPSFGMove( dis_handle *h, void *d, dis_dec_ins *ins )
{
    mips_ins    code;

    code.full = ins->opcode;
    ins->op[0].type = DO_REG;
    ins->op[0].base = code.frtype.ft + DR_MIPS_r0;
    ins->op[1].type = DO_REG;
    ins->op[1].base = code.frtype.fs + DR_MIPS_f0;
    ins->num_ops = 2;
    return( DHR_DONE );
}

dis_handler_return MIPSFPUOp2( dis_handle *h, void *d, dis_dec_ins *ins )
{
    mips_ins    code;

    code.full = ins->opcode;
    ins->op[0].type = DO_REG;
    ins->op[0].base = code.frtype.fd + DR_MIPS_f0;
    ins->op[1].type = DO_REG;
    ins->op[1].base = code.frtype.fs + DR_MIPS_f0;
    ins->num_ops = 2;
    ins->flags = MIPSFloatFmt( code.frtype.fmt );
    return( DHR_DONE );
}

dis_handler_return MIPSFPUOp3( dis_handle *h, void *d, dis_dec_ins *ins )
{
    mips_ins    code;

    code.full = ins->opcode;
    ins->op[0].type = DO_REG;
    ins->op[0].base = code.frtype.fd + DR_MIPS_f0;
    ins->op[1].type = DO_REG;
    ins->op[1].base = code.frtype.fs + DR_MIPS_f0;
    ins->op[2].type = DO_REG;
    ins->op[2].base = code.frtype.ft + DR_MIPS_f0;
    ins->num_ops = 3;
    ins->flags = MIPSFloatFmt( code.frtype.fmt );
    return( DHR_DONE );
}

dis_handler_return MIPSFPUCmp( dis_handle *h, void *d, dis_dec_ins *ins )
{
    mips_ins    code;

    code.full = ins->opcode;
    ins->op[0].type = DO_REG;
    ins->op[0].base = code.frtype.fs + DR_MIPS_f0;
    ins->op[1].type = DO_REG;
    ins->op[1].base = code.frtype.ft + DR_MIPS_f0;
    ins->num_ops = 2;
    ins->flags = MIPSFloatFmt( code.frtype.fmt );
    return( DHR_DONE );
}

dis_handler_return MIPSFPUMemory( dis_handle *h, void *d, dis_dec_ins *ins )
{
    mips_ins    code;

    code.full = ins->opcode;
    ins->op[0].type = DO_REG;
    ins->op[0].base = code.itype.rt + DR_MIPS_f0;
    ins->op[1].type = DO_MEMORY_ABS;
    ins->op[1].value = SEX( code.itype.immediate, 15 );
    ins->op[1].base = code.itype.rs + DR_MIPS_r0;
    ins->num_ops = 2;
    if( (ins->type == DI_MIPS_LDC1) || (ins->type == DI_MIPS_SDC1) )
        ins->op[1].ref_type = DRT_MIPS_DFLOAT;
    else
        ins->op[1].ref_type = DRT_MIPS_SFLOAT;
    return( DHR_DONE );
}

dis_handler_return MIPSBranchCop( dis_handle *h, void *d, dis_dec_ins *ins )
{
    mips_ins    code;

    code.full = ins->opcode;
    ins->op[0].type = DO_RELATIVE;
    ins->op[0].value = (SEX( code.itype.immediate, 15 ) + 1) * sizeof( unsigned_32 );
    ins->num_ops = 1;
    if( code.itype.rt & 0x10 )
        ins->flags |= DIF_MIPS_LIKELY;
    return( DHR_DONE );
}

static unsigned MIPSInsHook( dis_handle *h, void *d, dis_dec_ins *ins,
        dis_format_flags flags, char *name )
{
    const char  *new;

    if( !(flags & DFF_PSEUDO) ) return( 0 );
    new = NULL;
    switch( ins->type ) {
    case DI_MIPS_SLL:
        if( ins->op[0].base == DR_MIPS_r0 ) {
            new = "nop";
            ins->num_ops = 0;
        }
        break;
    case DI_MIPS_OR:
    case DI_MIPS_ADD:
    case DI_MIPS_ADDU:
        if( ins->op[2].base == DR_MIPS_r0 ) {
            new = "move";
            ins->num_ops = 2;
        } else if( ins->op[1].base == DR_MIPS_r0 ) {
            new = "move";
            ins->op[1].type  = ins->op[2].type;
            ins->op[1].base  = ins->op[2].base;
            ins->num_ops = 2;
        }
        break;
    case DI_MIPS_ADDIU:
    case DI_MIPS_ORI:
        if( ins->op[1].base == DR_MIPS_r0 ) {
            new = "li";
            ins->op[1].type  = ins->op[2].type;
            ins->op[1].value = ins->op[2].value;
            ins->num_ops = 2;
        }
        break;
    case DI_MIPS_JALR:
        if( ins->op[0].base == DR_MIPS_r31 ) {
            ins->op[0].type = ins->op[1].type;
            ins->op[0].base = ins->op[1].base;
            ins->num_ops = 1;
        }
        break;
    case DI_MIPS_BEQ:
        if( ins->op[0].base == DR_MIPS_r0 && ins->op[0].base == DR_MIPS_r0 ) {
            new = "b";
            ins->op[0].type  = ins->op[2].type;
            ins->op[0].base  = ins->op[2].base;
            ins->op[0].value = ins->op[2].value;
            ins->num_ops = 1;
        }
        break;
    default:
        break;
    }
    if( name != NULL && new != NULL ) {
        strcpy( name, new );
        return( strlen( name ) );
    }
    return( 0 );
}

static unsigned MIPSFlagHook( dis_handle *h, void *d, dis_dec_ins *ins,
        dis_format_flags flags, char *name )
{
    char        *p;

    p = name;
    if( ins->flags & DIF_MIPS_FF_FLAGS ) {
        *p++ = '.';
        if( ins->flags & DIF_MIPS_FF_S ) *p++ = 's';
        if( ins->flags & DIF_MIPS_FF_D ) *p++ = 'd';
        if( ins->flags & DIF_MIPS_FF_W ) *p++ = 'w';
        if( ins->flags & DIF_MIPS_FF_L ) *p++ = 'l';
        if( ins->flags & DIF_MIPS_FF_PS ) { *p++ = 'p'; *p++ = 's'; }
        *p = '\0';
    }
    return( p - name );
}

static unsigned MIPSOpHook( dis_handle *h, void *d, dis_dec_ins *ins,
        dis_format_flags flags, unsigned op_num, char *op_buff )
{
    dis_operand *op;

    if( flags & DFF_SYMBOLIC_REG ) {
        op = &ins->op[op_num];
        if( op->base >= DR_MIPS_r0 && op->base <= DR_MIPS_r31 ) {
            op->base += DR_MIPS_zero - DR_MIPS_r0;
        }
        if( op->index >= DR_MIPS_r0 && op->index <= DR_MIPS_r31 ) {
            op->index += DR_MIPS_zero - DR_MIPS_r0;
        }
    }
    if( flags & DFF_ASM ) {
        op = &ins->op[op_num];
        if( op->base >= DR_MIPS_r0 && op->base <= DR_MIPS_ra ) {
            op->base += DR_MIPS_ar0 - DR_MIPS_r0;
        }
        if( op->index >= DR_MIPS_r0 && op->base <= DR_MIPS_ra ) {
            op->index += DR_MIPS_ar0 - DR_MIPS_r0;
        }
    }
    return( 0 );
}

static dis_handler_return MIPSDecodeTableCheck( int page, dis_dec_ins *ins )
{
    return( DHR_DONE );
}

static void ByteSwap( dis_handle *h, void *d, dis_dec_ins *ins )
{
    if( h->need_bswap ) {
        SWAP_32( ins->opcode );
    }
}

static void MIPSPreprocHook( dis_handle *h, void *d, dis_dec_ins *ins )
{
    ByteSwap( h, d, ins );
}

static unsigned MIPSPostOpHook( dis_handle *h, void *d, dis_dec_ins *ins,
        dis_format_flags flags, unsigned op_num, char *op_buff )
{
    // Nothing to do
    return( 0 );
}

const dis_cpu_data MIPSData = {
    MIPSRangeTable, MIPSRangeTablePos, MIPSPreprocHook, MIPSDecodeTableCheck, MIPSInsHook, MIPSFlagHook, MIPSOpHook, MIPSPostOpHook, &MIPSMaxInsName, 4
};