kvisc/pc/instrs/jumps.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 "instrs.h"
#include "arch_i.h"

//
// Jump instructions
//

IMPL_START_1(jmp)
{
    JUMP(v1);
}
IMPL_END;

IMPL_START_1(loop)
{
    if (ctx->r[RCX].val > 0) {
        ctx->r[RCX].val--;
        JUMP(v1);
    }
}
IMPL_END;

IMPL_START_1(jz)
{
    if (ctx->r[FLG].val & ZF)
        JUMP(v1);
}
IMPL_END;

IMPL_START_1(jnz)
{
    if (!(ctx->r[FLG].val & ZF))
        JUMP(v1);
}
IMPL_END;

IMPL_START_1(je)
{
    if (ctx->r[FLG].val & ZF)
        JUMP(v1);
}
IMPL_END;

IMPL_START_1(jne)
{
    if (!(ctx->r[FLG].val & ZF))
        JUMP(v1);
}
IMPL_END;

IMPL_START_1(ja)
{
    if (!(ctx->r[FLG].val & ZF) && !(ctx->r[FLG].val & CF))
        JUMP(v1);
}
IMPL_END;

IMPL_START_1(jae)
{
    if (!(ctx->r[FLG].val & CF))
        JUMP(v1);
}
IMPL_END;

IMPL_START_1(jb)
{
    if (!(ctx->r[FLG].val & ZF) && ctx->r[FLG].val & CF)
        JUMP(v1);
}
IMPL_END;

IMPL_START_1(jbe)
{
    if (ctx->r[FLG].val & CF)
        JUMP(v1);
}
IMPL_END;

IMPL_START_1(jcxz)
{
    if (!ctx->r[RCX].val)
        JUMP(v1);
}
IMPL_END;