kvisc/vm/pc/regs.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.

// Register types
enum
{
    GPR = 0,        // Non-reserved
    RES = 1 << 0,   // Reserved for insternal use
    SYS = 1 << 1,   // Reserved for supervisor mode
};

// FLG register
enum
{
    ZF = 1 << 0,        // Zero flag
    SF = 1 << 1,        // Sign flag

    CF = 1 << 4,        // Carry flag
    OF = 1 << 5,        // Overflow flag

    PF = 1 << 8,        // Parity flag
    DF = 1 << 9,        // Direction flag
};

// CR0 register
enum
{
    IF = 1 << 0,       // Interrupts-enable flag
    UF = 1 << 1,       // User-mode flag
};

struct reg_t
{
    char   *name;
    ulong   flags;
};

enum
{
    RAX, RBX, RCX, RDX, RSI, RDI, AX0, AX1,
    AX2, AX3, AX4, AX5, R12, R13, R14, R15,
    R16, R17, R18, R19, R20, GRP, TRP, SRP,
    TMP, RAD, CR0, CR1, RIP, RBP, RSP, RZX,

    NREGS
};

#define _fc0 ctx->ninstrs
#define _rpc ctx->cur_pc