z80.c

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// SPDX-FileCopyrightText: 2014-2015 condret
// SPDX-FileCopyrightText: 2016 unlogic
// SPDX-License-Identifier: LGPL-3.0-only
 
#include <rz_asm.h>
#include <rz_types.h>
#include <stdio.h>
#include <string.h>
#include "z80_tab.h"
 
static ut8 z80_op_24_branch_index_res (ut8 hex) {
    if (hex < 0x40) {
        return hex;
    }
    switch (hex) {
    case 0x46: return 0x40;
    case 0x4e: return 0x41;
    case 0x56: return 0x42;
    case 0x5e: return 0x43;
    case 0x66: return 0x44;
    case 0x6e: return 0x45;
    case 0x76: return 0x46;
    case 0x7e: return 0x47;
    }
    return (hex > 0x7f)? hex - 0x38: 0xc8;
}
 
static int z80OpLength (const ut8 *buf, int len) {
    const z80_opcode *op;
    int type = 0, ret = 0;
    if (len < 1) {
        return 0;
    }
    op = z80_op;
    if (op[buf[0]].type & Z80_OP_UNK) {
        if (len < 2) {
            return 0;
        }
        if (op[buf[0]].type & Z80_ENC0) {
            op = (const z80_opcode *)op[buf[0]].op_moar;
            type = op[z80_fddd_branch_index_res(buf[1])].type;
        } else if (op[buf[0]].type & Z80_ENC1) {
            op = (const z80_opcode *)op[buf[0]].op_moar;
            type = op[z80_ed_branch_index_res(buf[1])].type;
        }
    } else {
        type = op[buf[0]].type;
    }
    if (type & Z80_OP8) {
        ret++;
    }
    if ((type & Z80_ARG8) && !(type & Z80_ARG16)) { //XXX
        ret++;
    }
    if (type & Z80_OP16) {
        ret += 2;
    }
    if (type & Z80_ARG16) {
        ret += 2;
    }
    if (type & Z80_OP24) {
        ret += 3;
    }
    if (ret > len) {
        return 0;
    }
    return ret;
}
 
// #include'd in asm/p/asm_z80.c
FUNC_ATTR_USED static int z80Disass (RzAsmOp *op, const ut8 *buf, int len) {
    int ret = z80OpLength (buf, len);
    const z80_opcode *z_op;
    const char **cb_tab;
    ut8 res;
    if (!ret) {
        return ret;
    }
    z_op = z80_op;
    const char *buf_asm = "invalid";
    switch (z_op[buf[0]].type) {
    case Z80_OP8:
        buf_asm = sdb_fmt ("%s", z_op[buf[0]].name);
        break;
    case Z80_OP8^Z80_ARG8:
        buf_asm = sdb_fmt (z_op[buf[0]].name, buf[1]);
        break;
    case Z80_OP8^Z80_ARG16:
        buf_asm = sdb_fmt (z_op[buf[0]].name, buf[1]+(buf[2]<<8));
        break;
    case Z80_OP16:
        cb_tab = (const char **) z_op[buf[0]].op_moar;
        buf_asm = sdb_fmt ("%s", cb_tab[buf[1]]);
        break;
    case Z80_OP_UNK ^ Z80_ENC1:
        z_op = (const z80_opcode *)z_op[buf[0]].op_moar;
        res = z80_ed_branch_index_res (buf[1]);
        if (z_op[res].type == Z80_OP16) {
            buf_asm = sdb_fmt ("%s", z_op[res].name);
        }
        if (z_op[res].type == (Z80_OP16^Z80_ARG16)) {
            buf_asm = sdb_fmt (z_op[res].name, buf[2]+(buf[3]<<8));
        }
        break;
    case Z80_OP_UNK ^ Z80_ENC0:
        z_op = (const z80_opcode *)z_op[buf[0]].op_moar;
        res = z80_fddd_branch_index_res (buf[1]);
        if (z_op[res].type == Z80_OP16) {
            buf_asm = sdb_fmt ("%s", z_op[res].name);
        }
        if (z_op[res].type == (Z80_OP16^Z80_ARG16)) {
            buf_asm = sdb_fmt (z_op[res].name, buf[2]+(buf[3]<<8));
        }
        if (z_op[res].type == (Z80_OP16^Z80_ARG8)) {
            buf_asm = sdb_fmt (z_op[res].name, buf[2]);
        }
        if (z_op[res].type == (Z80_OP24 ^ Z80_ARG8)) {
            cb_tab = (const char **) z_op[res].op_moar;
            buf_asm = sdb_fmt (cb_tab[z80_op_24_branch_index_res (buf[3])], buf[2]);
        }
        if (z_op[res].type == (Z80_OP16 ^ Z80_ARG8 ^ Z80_ARG16)) {
            buf_asm = sdb_fmt (z_op[res].name, buf[2], buf[3]);
        }
        break;
    }
    if (!strcmp (buf_asm, "invalid")) {
        ret = 0;
    }
    rz_asm_op_set_asm (op, buf_asm);
    return ret;
}