/***************************************************************************** * * 8000dasm.c * Portable Z8000(2) emulator * Z8000 disassembler; requires the z8000_exec table to be initialized * * Copyright (C) 1998,1999,2000 Juergen Buchmueller, all rights reserved. * You can contact me at juergen@mame.net or pullmoll@stop1984.com * * - This source code is released as freeware for non-commercial purposes * as part of the M.A.M.E. (Multiple Arcade Machine Emulator) project. * The licensing terms of MAME apply to this piece of code for the MAME * project and derviative works, as defined by the MAME license. You * may opt to make modifications, improvements or derivative works under * that same conditions, and the MAME project may opt to keep * modifications, improvements or derivatives under their terms exclusively. * * - Alternatively you can choose to apply the terms of the "GPL" (see * below) to this - and only this - piece of code or your derivative works. * Note that in no case your choice can have any impact on any other * source code of the MAME project, or binary, or executable, be it closely * or losely related to this piece of code. * * - At your choice you are also free to remove either licensing terms from * this file and continue to use it under only one of the two licenses. Do this * if you think that licenses are not compatible (enough) for you, or if you * consider either license 'too restrictive' or 'too free'. * * - GPL (GNU General Public License) * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. * * *****************************************************************************/ #include "z8000.h" #include "z8000cpu.h" #include "cpuintrf.h" static int n[12]; /* opcode nibbles */ static int b[6]; /* opcode bytes */ static int w[3]; /* opcode words */ static void GET_OP(const UINT8 *oprom, int i, unsigned offset) { UINT16 opcode = (oprom[offset] << 8) | oprom[offset + 1]; w[i] = opcode; b[i*2+0] = opcode >> 8; b[i*2+1] = opcode & 0xff; n[i*4+0] = (opcode >> 12) & 0x0f; n[i*4+1] = (opcode >> 8) & 0x0f; n[i*4+2] = (opcode >> 4) & 0x0f; n[i*4+3] = opcode & 0x0f; } static const char *cc[16] = { "n", "lt", "le", "ule", "pe/ov", "mi", "eq/z", "c/ult", "a", "ge", "gt", "ugt", "po/nov", "pl", "ne/nz", "nc/uge" }; static const char *flg[16] = { "", "p/v", "s", "p/v,s", "z", "p/v,z", "s,z", "p/v,s,z", "c", "p/v,c","s,c", "p/v,s,c", "z,c", "p/v,z,c","s,z,c","p/v,s,z,c" }; static const char *ints[4] = { "", "vi", "nvi", "vi,nvi" }; offs_t z8000_dasm(char *buff, offs_t pc, const UINT8 *oprom, const UINT8 *opram) { int new_pc = pc, i, tmp; char *dst = buff; const char *src; Z8000_exec *o; UINT32 flags = 0; GET_OP(oprom, 0, new_pc - pc); new_pc += 2; switch (pc) { case 0x0000: dst += sprintf(dst, ".word #$%04x ;RST", w[0]); break; case 0x0002: dst += sprintf(dst, ".word #$%04x ;RST FCW", w[0]); break; case 0x0004: dst += sprintf(dst, ".word #$%04x ;RST PC", w[0]); break; default: o = &z8000_exec[w[0]]; if (o->size > 1) { GET_OP(oprom, 1, new_pc - pc); new_pc += 2; } if (o->size > 2) { GET_OP(oprom, 2, new_pc - pc); new_pc += 2; } src = o->dasm; flags = o->dasmflags; while (*src) { if (*src == '%') { src++; switch (*src) { case '0': case '1': case '2': case '3': case '4': case '5': case '6': case '7': /* nibble number */ i = *src++ - '0'; dst += sprintf(dst, "%d", n[i]); break; case '#': /* immediate */ src++; switch (*src++) { case 'b': /* imm8 (byte) */ i = *src++ - '0'; dst += sprintf(dst, "#$%02x", b[i]); break; case 'w': /* imm16 (word) */ i = *src++ - '0'; dst += sprintf(dst, "#$%04x", w[i]); break; case 'l': /* imm32 (long) */ i = *src++ - '0'; dst += sprintf(dst, "#$%04x%04x", w[i], w[i+1]); break; } break; case '$': /* absolute immediate 8bit (rl/rr) */ src++; i = *src++ - '0'; dst += sprintf(dst, "#%d", ((INT8)b[i]<0) ? -(INT8)b[i] : b[i]); break; case '+': /* imm4m1 (inc/dec value) */ src++; i = *src++ - '0'; dst += sprintf(dst, "%i", n[i] + 1); break; case '*': /* left/right (rotate/shift) */ src++; dst += sprintf(dst, "%c", b[2] ? 'r' : 'l'); break; case '?': /* imm1or2 (shift/rotate once or twice) */ src++; i = *src++ - '0'; dst += sprintf(dst, "%c", (n[i] & 2) ? '2' : '1'); break; case 'R': src++; tmp = ((n[1] & 0x01) << 16) + (n[3] << 8) + (n[7] & 0x08); switch (tmp) { case 0x000: dst += sprintf(dst, "inirb "); flags = DASMFLAG_STEP_OVER; break; case 0x008: dst += sprintf(dst, "inib "); break; case 0x010: dst += sprintf(dst, "sinirb"); flags = DASMFLAG_STEP_OVER; break; case 0x018: dst += sprintf(dst, "sinib "); break; case 0x020: dst += sprintf(dst, "otirb "); flags = DASMFLAG_STEP_OVER; break; case 0x028: dst += sprintf(dst, "outib "); break; case 0x030: dst += sprintf(dst, "soutib"); break; case 0x038: dst += sprintf(dst, "sotirb"); flags = DASMFLAG_STEP_OVER; break; case 0x040: dst += sprintf(dst, "inb "); break; case 0x048: dst += sprintf(dst, "inb "); break; case 0x050: dst += sprintf(dst, "sinb "); break; case 0x058: dst += sprintf(dst, "sinb "); break; case 0x060: dst += sprintf(dst, "outb "); break; case 0x068: dst += sprintf(dst, "outb "); break; case 0x070: dst += sprintf(dst, "soutb "); break; case 0x078: dst += sprintf(dst, "soutb "); break; case 0x080: dst += sprintf(dst, "indrb "); flags = DASMFLAG_STEP_OVER; break; case 0x088: dst += sprintf(dst, "indb "); break; case 0x090: dst += sprintf(dst, "sindrb"); flags = DASMFLAG_STEP_OVER; break; case 0x098: dst += sprintf(dst, "sindb "); break; case 0x0a0: dst += sprintf(dst, "otdrb "); flags = DASMFLAG_STEP_OVER; break; case 0x0a8: dst += sprintf(dst, "outdb "); break; case 0x0b0: dst += sprintf(dst, "soutdb"); break; case 0x0b8: dst += sprintf(dst, "sotdrb"); flags = DASMFLAG_STEP_OVER; break; case 0x100: dst += sprintf(dst, "inir "); flags = DASMFLAG_STEP_OVER; break; case 0x108: dst += sprintf(dst, "ini "); break; case 0x110: dst += sprintf(dst, "sinir "); flags = DASMFLAG_STEP_OVER; break; case 0x118: dst += sprintf(dst, "sini "); break; case 0x120: dst += sprintf(dst, "otir "); flags = DASMFLAG_STEP_OVER; break; case 0x128: dst += sprintf(dst, "outi "); break; case 0x130: dst += sprintf(dst, "souti "); break; case 0x138: dst += sprintf(dst, "sotir "); flags = DASMFLAG_STEP_OVER; break; case 0x140: dst += sprintf(dst, "in "); break; case 0x148: dst += sprintf(dst, "in "); break; case 0x150: dst += sprintf(dst, "sin "); break; case 0x158: dst += sprintf(dst, "sin "); break; case 0x160: dst += sprintf(dst, "out "); break; case 0x168: dst += sprintf(dst, "out "); break; case 0x170: dst += sprintf(dst, "sout "); break; case 0x178: dst += sprintf(dst, "sout "); break; case 0x180: dst += sprintf(dst, "indr "); flags = DASMFLAG_STEP_OVER; break; case 0x188: dst += sprintf(dst, "ind "); break; case 0x190: dst += sprintf(dst, "sindr "); flags = DASMFLAG_STEP_OVER; break; case 0x198: dst += sprintf(dst, "sind "); break; case 0x1a0: dst += sprintf(dst, "otdr "); flags = DASMFLAG_STEP_OVER; break; case 0x1a8: dst += sprintf(dst, "outd "); break; case 0x1b0: dst += sprintf(dst, "soutd "); break; case 0x1b8: dst += sprintf(dst, "sotdr "); flags = DASMFLAG_STEP_OVER; break; default: dst += sprintf(dst, "??????"); } break; case 'a': /* address */ src++; i = *src++ - '0'; dst += sprintf(dst, "$%04x", w[i]); break; case 'c': /* condition code */ src++; i = *src++ - '0'; if (n[i] == 8) { /* always? */ /* skip following comma */ if (*src == ',') src++; } else dst += sprintf(dst, "%s", cc[n[i]]); break; case 'd': /* displacement */ src++; i = *src++ - '0'; switch (i) { case 0: /* disp7 */ tmp = new_pc - 2 * (w[0] & 0x7f); dst += sprintf(dst, "#$%04x", tmp); break; case 1: /* disp8 */ tmp = new_pc + 2 * (INT8)(w[0] & 0xff); dst += sprintf(dst, "#$%04x", tmp); break; case 2: /* disp12 */ tmp = w[0] & 0x7ff; if (w[0] & 0x800) tmp = new_pc + 0x1000 -2 * tmp; else tmp = new_pc + -2 * tmp; dst += sprintf(dst, "#$%04x", tmp); break; } break; case 'f': /* flag (setflg/resflg/comflg) */ src++; i = *src++ - '0'; dst += sprintf(dst, "%s", flg[n[i]]); break; case 'i': /* interrupts */ src++; i = *src++ - '0'; dst += sprintf(dst, "%s", ints[n[i] & 3]); break; case 'p': /* disp16 (pc relative) */ src++; i = *src++ - '0'; dst += sprintf(dst, "$%04x", new_pc + w[i]); break; case 'r': /* register */ src++; switch (*src++) { case 'b': /* byte */ i = *src++ - '0'; if (n[i] & 8) dst += sprintf(dst, "rl%d", n[i] & 7); else dst += sprintf(dst, "rh%d", n[i]); break; case 'w': /* word */ i = *src++ - '0'; dst += sprintf(dst, "r%d", n[i]); break; case 'l': /* long */ i = *src++ - '0'; dst += sprintf(dst, "rr%d", n[i]); break; case 'q': /* quad word (long long) */ i = *src++ - '0'; dst += sprintf(dst, "rq%d", n[i]); break; } break; default: *dst++ = '%'; *dst++ = *src++; break; } } else *dst++ = *src++; } *dst = '\0'; break; } return (new_pc - pc) | flags | DASMFLAG_SUPPORTED; }