/* Author      : Rick van der Zwet
 * S-number    : 0433373
 * Version     : $Id: imm.c 365 2007-12-03 08:54:04Z rick $
 * Copyright   : FreeBSD Licence
 * Description : MIPS simulator. Main module
 */

#include <stdlib.h>
#include <stdio.h>
#include <sysexits.h>
#include "sim.h"
#include "imm.h"
#include "alu.h"

word
imm_call(const word in, const imm_control_t action)
{
    word out = 0;
    switch (action)
    {
    case S16:
        out = alu_sra(in << 16, 16);
        break;
    case SSA:
        out = alu_sra(in << 21, 27);
        break;
    case U26:
        out = in & 0x03FFFFFF;
        break;
    case Z16:
        out = in & 0x0000FFFF;
        break;
    case S16x4:
        out = alu_sra(in << 16, 14);
        break;
    default:
        fprintf(stderr, "IMM action '%i' not implmented\n", action);
        exit(EX_SOFTWARE);
        break;
    };
    return (out);
}