// 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>

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

IMPL_START_1(jmp) { R(RIP) = v1; } IMPL_END;
IMPL_START_1(loop) {
    if (R(RCX) > 0) {
        R(RCX)--;
        R(RIP) = v1;
    }
}
IMPL_END;

IMPL_START_3(b) {
    COMPARE_SUB(v1, v2);

    if (eval_cond(ctx, ctx->cond))
        R(RIP) = v3;
}
IMPL_END;

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

IMPL_START_X_NOIN(lea) { v1 = p2->addr; } IMPL_OUT;
IMPL_START_2_ONLY(mov) { v1 = v2; } IMPL_OUT;

IMPL_START_2_ONLY(movsxb) { v1 = (ulong)(long)(char)(v2 & 0xFF); }IMPL_OUT;
IMPL_START_2_ONLY(movsxw) { v1 = (ulong)(long)(short)(v2 & 0xFFFF); }IMPL_OUT;
IMPL_START_2_ONLY(movsxl) { v1 = (ulong)(long)(int)(v2 & 0xFFFFFFFF); }IMPL_OUT;

IMPL_START_X_NOIN(movzx) { DECVZX(v2, p2); v1 = v2; } IMPL_OUT;

IMPL_START_2(xchg) { ulong t = v1; v1 = v2; v2 = t; } IMPL_OUT_2;

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

//
// Stack manipulation instructions
//

IMPL_START_1(push) {
    R(RSP) -= 8;
    writemem(ctx, v1, R(RSP), 8);
} IMPL_END;

IMPL_START_1(pop) {
    v1 = readmem(ctx, R(RSP), 8);
    R(RSP) += 8;
} IMPL_OUT;

/*
IMPL_START_1(call) {
    R(RSP) -= 8;
    writemem(ctx, R(RIP), R(RSP), 8);
    R(RIP) = v1;
} IMPL_END;
*/

IMPL_START_1(call) {
    R(RSP) -= 8;
    writemem(ctx, R(RIP), R(RSP), 8);
    R(RIP) = v1;

    if (p2)
    {
        DECV(v2, p2);
        ax0 = v2;

        if (p3)
        {
            DECV(v3, p3);
            ax1 = v3;
        }
    }

} IMPL_END;

IMPL_START_0(ret) {
    R(RIP) = readmem(ctx, R(RSP), 8); R(RSP) += 8;
} IMPL_END;

IMPL_START_1(enter) {
    writemem(ctx, R(RBP), R(RSP) - 8, 8);
    R(RBP) = R(RSP) - 8;
    R(RSP) -= (v1 + 1) * 8;
} IMPL_END;

IMPL_START_0(leave) {
    R(RSP) = R(RBP) + 8;
    R(RBP) = readmem(ctx, R(RBP), 8);
} IMPL_END;

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