snesdis.c

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// SPDX-FileCopyrightText: 2015-2018 condret <condr3t@protonmail.com>
// SPDX-FileCopyrightText: 2015-2018 pancake <pancake@nopcode.org>
// SPDX-License-Identifier: LGPL-3.0-only
 
#include <rz_types.h>
#include <rz_util.h>
#include <rz_asm.h>
#include <rz_lib.h>
#include <string.h>
#include "snes_op_table.h"
 
static int snesDisass(int M_flag, int X_flag, ut64 pc, RzAsmOp *op, const ut8 *buf, int len) {
    snes_op_t *s_op = &snes_op[buf[0]];
    int op_len = snes_op_get_size(M_flag, X_flag, s_op);
    if (len < op_len) {
        return 0;
    }
    const char *buf_asm = "invalid";
    switch (s_op->len) {
    case SNES_OP_8BIT:
        buf_asm = s_op->name;
        break;
    case SNES_OP_16BIT:
        if (*buf % 0x20 == 0x10 || *buf == 0x80) { // relative branch
            buf_asm = sdb_fmt(s_op->name, (ut32)(pc + 2 + (st8)buf[1]));
        } else {
            buf_asm = sdb_fmt(s_op->name, buf[1]);
        }
        break;
    case SNES_OP_24BIT:
        if (*buf == 0x44 || *buf == 0x54) { // mvp and mvn
            buf_asm = sdb_fmt(s_op->name, buf[1], buf[2]);
        } else if (*buf == 0x82) { // brl
            buf_asm = sdb_fmt(s_op->name, pc + 3 + (st16)rz_read_le16(buf + 1));
        } else {
            buf_asm = sdb_fmt(s_op->name, rz_read_le16(buf + 1));
        }
        break;
    case SNES_OP_32BIT:
        buf_asm = sdb_fmt(s_op->name, buf[1] | buf[2] << 8 | buf[3] << 16);
        break;
    case SNES_OP_IMM_M:
        if (M_flag) {
            buf_asm = sdb_fmt("%s #0x%02x", s_op->name, buf[1]);
        } else {
            buf_asm = sdb_fmt("%s #0x%04x", s_op->name, rz_read_le16(buf + 1));
        }
        break;
    case SNES_OP_IMM_X:
        if (X_flag) {
            buf_asm = sdb_fmt("%s #0x%02x", s_op->name, buf[1]);
        } else {
            buf_asm = sdb_fmt("%s #0x%04x", s_op->name, rz_read_le16(buf + 1));
        }
        break;
    }
    rz_strbuf_set(&op->buf_asm, buf_asm);
    return op_len;
}