kvisc/vm/pc/decode.h

// The OS/K Team licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.

enum
{
    A_NONE      = 0,
    A_REG       = 3,

    A_IMM8     = 1,
    A_IMM16    = 2,
    A_IMM32    = 4,
    A_IMM64    = 8,

    AM_RR       = 0xF0,
    AM_RRI      = 0xF1,
    AM_RRII     = 0xF2,
};

#define ACC_FMT_IS_MEM(x) (((x) & 0xF0) != 0)
#define ACC_IS_MEM(p) ACC_FMT_IS_MEM((p)->type)

struct acc_t
{
    uint type;
    ulong val;

    // A_REG
    uchar reg;

    // AM_...
    ulong addr;
    uint mlen;

    // For instruction dumping ONLY
    uchar reg1, reg2;
    char imm1;
    long imm2;
};

enum { NOPRM, P_REG, P_IMM, P_MEM=4 };

struct instr_t
{
    char   *name;
    uint    nprms;
    uint  (*func)(acc_t *, acc_t *, acc_t *,
                  ulong *, ulong *);
};

void exec_instr(instr_t *in,
                acc_t *p1,
                acc_t *p2,
                acc_t *p3);

void dump_instr(instr_t *in,
                acc_t *p1,
                acc_t *p2,
                acc_t *p3);