i4004dis.c

Go to the documentation of this file.

// SPDX-FileCopyrightText: 2014-2018 condret <condr3t@protonmail.com>
// SPDX-FileCopyrightText: 2014-2018 pancake <pancake@nopcode.org>
// SPDX-License-Identifier: LGPL-3.0-only
 
#include <rz_asm.h>
#include <rz_types.h>
#include <string.h>
#include <stdio.h>
 
/* That 3 is a hack */
static const int i4004_ins_len[16] = {
    1, 2, 3, 1, 2, 2, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1
};
 
static const char *i4004_e[16] = {
    "wrm",
    "wmp",
    "wrr",
    "wpm",
    "wr0",
    "wr1",
    "wr2",
    "wr3",
    "sbm",
    "rdm",
    "rdr",
    "adm",
    "rd0",
    "rd1",
    "rd2",
    "rd3"
};
 
static const char *i4004_f[16] = {
    "clb",
    "clc",
    "iac",
    "cmc",
    "cma",
    "ral",
    "rar",
    "tcc",
    "dac",
    "tcs",
    "stc",
    "daa",
    "kbp",
    "dcl",
    "invalid",
    "invalid"
};
 
static int i4004_get_ins_len(ut8 hex) {
    ut8 high = (hex & 0xf0) >> 4;
    int ret = i4004_ins_len[high];
    if (ret == 3)
        ret = (hex & 1) ? 1 : 2;
    return ret;
}
 
static int i4004dis(RzAsmOp *op, const ut8 *buf, int len) {
    int rlen = i4004_get_ins_len(*buf);
    ut8 high = (*buf & 0xf0) >> 4;
    ut8 low = (*buf & 0xf);
    const char *buf_asm = "invalid";
    if (rlen > len) {
        return op->size = 0;
    }
    switch (high) {
    case 0: buf_asm = low ? "invalid" : "nop"; break;
    case 1: buf_asm = sdb_fmt("jcn %d 0x%02x", low, buf[1]); break;
    case 2:
        if (rlen == 1) {
            buf_asm = sdb_fmt("src r%d", (low & 0xe));
        } else {
            buf_asm = sdb_fmt("fim r%d, 0x%02x", (low & 0xe), buf[1]);
        }
        break;
    case 3:
        if ((low & 1) == 1) {
            buf_asm = sdb_fmt("jin r%d", (low & 0xe));
        } else {
            buf_asm = sdb_fmt("fin r%d", (low & 0xe));
        }
        break;
    case 4: buf_asm = sdb_fmt("jun 0x%03x", ((ut16)(low << 8) | buf[1])); break;
    case 5: buf_asm = sdb_fmt("jms 0x%03x", ((ut16)(low << 8) | buf[1])); break;
    case 6: buf_asm = sdb_fmt("inc r%d", low); break;
    case 7: buf_asm = sdb_fmt("isz r%d, 0x%02x", low, buf[1]); break;
    case 8: buf_asm = sdb_fmt("add r%d", low); break;
    case 9: buf_asm = sdb_fmt("sub r%d", low); break;
    case 10: buf_asm = sdb_fmt("ld r%d", low); break;
    case 11: buf_asm = sdb_fmt("xch r%d", low); break;
    case 12: buf_asm = sdb_fmt("bbl %d", low); break;
    case 13: buf_asm = sdb_fmt("ldm %d", low); break;
    case 14: buf_asm = i4004_e[low]; break;
    case 15: buf_asm = i4004_f[low]; break;
    }
    rz_strbuf_set(&op->buf_asm, buf_asm);
    return op->size = rlen;
}