kvisc/vm/in/string.c

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

#include <in/instrs.h>

//----------------------------------------------------------------------------//

#define STR_MOVE(reg, len)                                                  \
    if ((flg & DF) == 0)                                                    \
        R(reg) += len;                                                      \
    else                                                                    \
        R(reg) -= len;

//----------------------------------------------------------------------------//

void stos_impl(ctx_t *ctx, acc_t *p1, acc_t *p2, uint len)
{
    ulong reg, val;

    if (p2) {
        DECV(v2, p2);
        reg = p1->reg;
        val = v2;
    }

    else if (p1) {
        DECV(v1, p1);
        reg = RDI;
        val = v1;
    }
    
    else {
        reg = RDI;
        val = rax;
    }

    writemem(ctx, val, R(reg), len);

    STR_MOVE(reg, len);
}

IMPL_START_0(stosb)
{
    stos_impl(ctx, p1, p2, 1);
}
IMPL_END;

IMPL_START_0(stosw)
{
    stos_impl(ctx, p1, p2, 2);
}
IMPL_END;

IMPL_START_0(stosl)
{
    stos_impl(ctx, p1, p2, 4);
}
IMPL_END;

IMPL_START_0(stosq)
{
    stos_impl(ctx, p1, p2, 8);
}
IMPL_END;

//----------------------------------------------------------------------------//

void lods_impl(ctx_t *ctx, acc_t *p1, acc_t *p2, uint len)
{
    ulong reg1, reg2;

    if (p2) {
        reg1 = p1->reg;
        reg2 = p2->reg;
    }

    else if (p1) {
        reg1 = p1->reg;
        reg2 = RSI;
    }
    
    else {
        reg1 = RAX;
        reg2 = RSI;
    }

    R(reg1) = readmem(ctx, R(reg2), len);
}

IMPL_START_0(lodsb)
{
    lods_impl(ctx, p1, p2, 1);
}
IMPL_END;

IMPL_START_0(lodsw)
{
    lods_impl(ctx, p1, p2, 2);
}
IMPL_END;

IMPL_START_0(lodsl)
{
    lods_impl(ctx, p1, p2, 4);
}
IMPL_END;

IMPL_START_0(lodsq)
{
    lods_impl(ctx, p1, p2, 8);
}
IMPL_END;

//----------------------------------------------------------------------------//

IMPL_START_0(scasb)
{
}
IMPL_END;

//----------------------------------------------------------------------------//

IMPL_START_0(cmpsb)
{
}
IMPL_END;

//----------------------------------------------------------------------------//

IMPL_START_0(movsb)
{
}
IMPL_END;

//----------------------------------------------------------------------------//