kvisc/vm/pc/exec.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 <pc/arch.h>

#define OUTPUT(p, r) {                                                      \
    if (p->type == A_REG)                                                   \
        R(p->reg) = r;                                                      \
    else if (ACC_IS_MEM(p))                                                 \
        writemem(r, p->addr, p->mlen);                                      \
    else _except(E_ACC, "Trying to output to an IMM");                      \
    }

//
// Executes an instruction
//
void exec_instr(instr_t *in,
                acc_t *p1,
                acc_t *p2, 
                acc_t *p3)
{
    uint out;
    ulong r1 = 0, r2 = 0;

    // Global instruction counter
    ctx->ninstrs++;

    if (ctx->dumpsw)
        dump_instr(in, p1, p2, p3);

    out = in->func(p1, p2, p3, &r1, &r2);

    if (out)
    {
        OUTPUT(p1, r1);
        if (__builtin_expect(out == 2, 0))
            OUTPUT(p2, r2);

        R(EZX) = 0;
    }
}