// license:BSD-3-Clause // copyright-holders:Juergen Buchmueller /*************************************************************************** * * Portable Signetics 2650 disassembler * * Written by J. Buchmueller (pullmoll@t-online.de) * for the MAME project * **************************************************************************/ #include "emu.h" #include "2650dasm.h" /* handy table to build relative offsets from HR (holding register) */ const int s2650_disassembler::rel[0x100] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, -64,-63,-62,-61,-60,-59,-58,-57,-56,-55,-54,-53,-52,-51,-50,-49, -48,-47,-46,-45,-44,-43,-42,-41,-40,-39,-38,-37,-36,-35,-34,-33, -32,-31,-30,-29,-28,-27,-26,-25,-24,-23,-22,-21,-20,-19,-18,-17, -16,-15,-14,-13,-12,-11,-10, -9, -8, -7, -6, -5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, -64,-63,-62,-61,-60,-59,-58,-57,-56,-55,-54,-53,-52,-51,-50,-49, -48,-47,-46,-45,-44,-43,-42,-41,-40,-39,-38,-37,-36,-35,-34,-33, -32,-31,-30,-29,-28,-27,-26,-25,-24,-23,-22,-21,-20,-19,-18,-17, -16,-15,-14,-13,-12,-11,-10, -9, -8, -7, -6, -5, -4, -3, -2, -1, }; std::string s2650_disassembler::SYM(int addr) { return util::string_format("$%04x", addr); } /* format an immediate */ std::string s2650_disassembler::IMM(offs_t pc, const data_buffer ¶ms) { return util::string_format("$%02x", params.r8(pc)); } const char s2650_disassembler::cc[4] = { 'z', 'p', 'm', 'a' }; void s2650_disassembler::add(std::string &buf, std::string str) { if(!buf.empty()) buf += '+'; buf += str; } /* format an immediate for PSL */ std::string s2650_disassembler::IMM_PSL(offs_t pc, const data_buffer ¶ms) { u8 v = params.r8(pc); if (v == 0xff) { return "all"; } else { std::string buff; switch (v & 0xc0) { case 0x40: add(buff, "p"); break; case 0x80: add(buff, "m"); break; case 0xc0: add(buff, "cc"); break; } if (v & 0x20) /* inter digit carry */ add(buff, "idc"); if (v & 0x10) /* register select */ add(buff, "rs"); if (v & 0x08) /* with carry */ add(buff, "wc"); if (v & 0x04) /* overflow */ add(buff, "ovf"); if (v & 0x02) /* 2's complement comparisons */ add(buff, "com"); if (v & 0x01) /* carry */ add(buff, "c"); return buff; } } /* format an immediate for PSU (processor status upper) */ std::string s2650_disassembler::IMM_PSU(offs_t pc, const data_buffer ¶ms) { int v = params.r8(pc); if (v == 0xff) { return "all"; } else { std::string buff; if (v & 0x80) /* sense input */ add(buff, "si"); if (v & 0x40) /* flag output */ add(buff, "fo"); if (v & 0x20) /* interrupt inhibit */ add(buff, "ii"); if (v & 0x10) /* unused bit 4 */ add(buff, "4"); if (v & 0x08) /* unused bit 3 */ add(buff, "3"); if (v & 0x04) /* stack pointer bit 2 */ add(buff, "sp2"); if (v & 0x02) /* stack pointer bit 1 */ add(buff, "sp1"); if (v & 0x01) /* stack pointer bit 0 */ add(buff, "sp0"); return buff; } } /* format an relative address */ std::string s2650_disassembler::REL(offs_t pc, const data_buffer ¶ms) { int o = params.r8(pc); return util::string_format("%s%s", (o&0x80)?"*":"", SYM((pc&0x6000)+((pc+1+rel[o])&0x1fff))); } /* format an relative address (implicit page 0) */ std::string s2650_disassembler::REL0(offs_t pc, const data_buffer ¶ms) { int o = params.r8(pc); return util::string_format("%s%s", (o&0x80)?"*":"", SYM((rel[o]) & 0x1fff)); } /* format a destination register and an absolute address */ std::string s2650_disassembler::ABS(int load, int r, offs_t pc, const data_buffer ¶ms) { int h = params.r8(pc); int l = params.r8((pc&0x6000)+((pc+1)&0x1fff)); int a = (pc & 0x6000) + ((h & 0x1f) << 8) + l; if (m_config->get_z80_mnemonics_mode()) { if (load) { switch (h >> 5) { case 0: return util::string_format("r%d,(%s)", r, SYM(a)); case 1: return util::string_format("r0,(%s,r%d++)", SYM(a), r); case 2: return util::string_format("r0,(%s,r%d--)", SYM(a), r); case 3: return util::string_format("r0,(%s,r%d)", SYM(a), r); case 4: return util::string_format("r%d,*(%s)", r, SYM(a)); case 5: return util::string_format("r0,*(%s,r%d++)", SYM(a), r); case 6: return util::string_format("r0,*(%s,r%d--)", SYM(a), r); case 7: return util::string_format("r0,*(%s,r%d)", SYM(a), r); } } else { switch (h >> 5) { case 0: return util::string_format("(%s),r%d", SYM(a), r); case 1: return util::string_format("(%s,r%d++),r0", SYM(a), r); case 2: return util::string_format("(%s,r%d--),r0", SYM(a), r); case 3: return util::string_format("(%s,r%d),r0", SYM(a), r); case 4: return util::string_format("*(%s),r%d", SYM(a), r); case 5: return util::string_format("*(%s,r%d++),r0", SYM(a), r); case 6: return util::string_format("*(%s,r%d--),r0", SYM(a), r); case 7: return util::string_format("*(%s,r%d),r0", SYM(a), r); } } } else { switch (h >> 5) { case 0: return util::string_format("%d %s", r, SYM(a)); case 1: return util::string_format("0 %s,r%d+", SYM(a), r); case 2: return util::string_format("0 %s,r%d-", SYM(a), r); case 3: return util::string_format("0 %s,r%d", SYM(a), r); case 4: return util::string_format("%d *%s", r, SYM(a)); case 5: return util::string_format("0 *%s,r%d+", SYM(a), r); case 6: return util::string_format("0 *%s,r%d-", SYM(a), r); case 7: return util::string_format("0 *%s,r%d", SYM(a), r); } } return ""; } /* format an (branch) absolute address */ std::string s2650_disassembler::ADR(offs_t pc, const data_buffer ¶ms) { int h = params.r8(pc); int l = params.r8((pc&0x6000)+((pc+1)&0x1fff)); int a = ((h & 0x7f) << 8) + l; if (h & 0x80) return util::string_format("*%s", SYM(a)); else return util::string_format("%s", SYM(a)); } s2650_disassembler::s2650_disassembler(config *conf) : m_config(conf) { } /* disassemble one instruction at PC into buff. return byte size of instr */ offs_t s2650_disassembler::disassemble(std::ostream &stream, offs_t pc, const data_buffer &opcodes, const data_buffer ¶ms) { uint32_t flags = 0; int PC = pc; int op = opcodes.r8(pc); int rv = op & 3; bool z80 = m_config->get_z80_mnemonics_mode(); pc += 1; switch (op) { case 0x00: case 0x01: case 0x02: case 0x03: util::stream_format(stream, z80 ? "ld r0,r%d" : "lodz,%d", rv); break; case 0x04: case 0x05: case 0x06: case 0x07: util::stream_format(stream, z80 ? "ld r%d,%s" : "lodi,%d %s", rv, IMM(pc, params)); pc+=1; break; case 0x08: case 0x09: case 0x0a: case 0x0b: util::stream_format(stream, z80 ? "ld r%d,(%s)" : "lodr,%d %s", rv, REL(pc, params)); pc+=1; break; case 0x0c: case 0x0d: case 0x0e: case 0x0f: util::stream_format(stream, z80 ? "ld %s" : "loda,%s", ABS(1,rv,pc, params)); pc+=2; break; case 0x10: case 0x11: util::stream_format(stream, z80 ? "**** $%02X" : "**** $%02X",op); break; case 0x12: util::stream_format(stream, z80 ? "ld r0,psu" : "spsu"); break; case 0x13: util::stream_format(stream, z80 ? "ld r0,psl" : "spsl"); break; case 0x14: case 0x15: case 0x16: case 0x17: if (z80) { if (rv == 3) util::stream_format(stream, "ret"); else util::stream_format(stream, "ret %c", cc[rv]); } else util::stream_format(stream, "retc %c", cc[rv]); flags = STEP_OUT; break; case 0x18: case 0x19: case 0x1a: case 0x1b: if (z80) { if (rv == 3) util::stream_format(stream, "jr %s", REL(pc, params)); else util::stream_format(stream, "jr %c,%s", cc[rv], REL(pc, params)); } else util::stream_format(stream, "bctr,%c %s", cc[rv], REL(pc, params)); pc+=1; break; case 0x1c: case 0x1d: case 0x1e: case 0x1f: if (z80) { if (rv == 3) util::stream_format(stream, "jp %s", ADR(pc, params)); else util::stream_format(stream, "jp %c,%s", cc[rv], ADR(pc, params)); } else util::stream_format(stream, "bcta,%c %s", cc[rv], ADR(pc, params)); pc+=2; break; case 0x20: case 0x21: case 0x22: case 0x23: util::stream_format(stream, z80 ? "xor r0,r%d" : "eorz,%d", rv); break; case 0x24: case 0x25: case 0x26: case 0x27: util::stream_format(stream, z80 ? "xor r%d,%s" : "eori,%d %s", rv, IMM(pc, params)); pc+=1; break; case 0x28: case 0x29: case 0x2a: case 0x2b: util::stream_format(stream, z80 ? "xor r%d,(%s)" : "eorr,%d %s", rv, REL(pc, params)); pc+=1; break; case 0x2c: case 0x2d: case 0x2e: case 0x2f: util::stream_format(stream, z80 ? "xor %s" : "eora,%s", ABS(1,rv,pc, params)); pc+=2; break; case 0x30: case 0x31: case 0x32: case 0x33: util::stream_format(stream, z80 ? "in r%d,(ctrl)" : "redc,%d", rv); break; case 0x34: case 0x35: case 0x36: case 0x37: if (z80) { if (rv == 3) util::stream_format(stream, "iret"); else util::stream_format(stream, "iret %c", cc[rv]); } else util::stream_format(stream, "rete %c", cc[rv]); flags = STEP_OUT; break; case 0x38: case 0x39: case 0x3a: case 0x3b: if (z80) { if (rv == 3) util::stream_format(stream, "calr %s", REL(pc, params)); else util::stream_format(stream, "calr %c,%s", cc[rv], REL(pc, params)); } else util::stream_format(stream, "bstr,%c %s", cc[rv], REL(pc, params)); pc+=1; flags = STEP_OVER; break; case 0x3c: case 0x3d: case 0x3e: case 0x3f: if (z80) { if (rv == 3) util::stream_format(stream, "call %s", ADR(pc, params)); else util::stream_format(stream, "call %c,%s", cc[rv], ADR(pc, params)); } else util::stream_format(stream, "bsta,%c %s", cc[rv], ADR(pc, params)); pc+=2; flags = STEP_OVER; break; case 0x40: util::stream_format(stream, "halt"); break; case 0x41: case 0x42: case 0x43: util::stream_format(stream, z80 ? "and r0,r%d" : "andz,%d", rv); break; case 0x44: case 0x45: case 0x46: case 0x47: util::stream_format(stream, z80 ? "and r%d,%s" : "andi,%d %s", rv, IMM(pc, params)); pc+=1; break; case 0x48: case 0x49: case 0x4a: case 0x4b: util::stream_format(stream, z80 ? "and r%d,(%s)" : "andr,%d %s", rv, REL(pc, params)); pc+=1; break; case 0x4c: case 0x4d: case 0x4e: case 0x4f: util::stream_format(stream, z80 ? "and %s" : "anda,%s", ABS(1,rv,pc, params)); pc+=2; break; case 0x50: case 0x51: case 0x52: case 0x53: util::stream_format(stream, z80 ? "ror r%d" : "rrr,%d", rv); break; case 0x54: case 0x55: case 0x56: case 0x57: util::stream_format(stream, z80 ? "in r%d,(%s)" : "rede,%d %s", rv, IMM(pc, params)); pc+=1; break; case 0x58: case 0x59: case 0x5a: case 0x5b: util::stream_format(stream, z80 ? "jrnz r%d,%s" : "brnr,%d %s", rv, REL(pc, params)); pc+=1; break; case 0x5c: case 0x5d: case 0x5e: case 0x5f: util::stream_format(stream, z80 ? "jpnz r%d,%s" : "brna,%d %s", rv, ADR(pc, params)); pc+=2; break; case 0x60: case 0x61: case 0x62: case 0x63: util::stream_format(stream, z80 ? "or r0,r%d" : "iorz,%d", rv); break; case 0x64: case 0x65: case 0x66: case 0x67: util::stream_format(stream, z80 ? "or r%d,%s" : "iori,%d %s", rv, IMM(pc, params)); pc+=1; break; case 0x68: case 0x69: case 0x6a: case 0x6b: util::stream_format(stream, z80 ? "or r%d,(%s)" : "iorr,%d %s", rv, REL(pc, params)); pc+=1; break; case 0x6c: case 0x6d: case 0x6e: case 0x6f: util::stream_format(stream, z80 ? "or %s" : "iora,%s", ABS(1,rv,pc, params)); pc+=2; break; case 0x70: case 0x71: case 0x72: case 0x73: util::stream_format(stream, z80 ? "in r%d,(data)" : "redd,%d", rv); break; case 0x74: util::stream_format(stream, z80 ? "res psu,%s" : "cpsu %s", IMM_PSU(pc, params)); pc+=1; break; case 0x75: util::stream_format(stream, z80 ? "res psl,%s" : "cpsl %s", IMM_PSL(pc, params)); pc+=1; break; case 0x76: util::stream_format(stream, z80 ? "set psu,%s" : "ppsu %s", IMM_PSU(pc, params)); pc+=1; break; case 0x77: util::stream_format(stream, z80 ? "set psl,%s" : "ppsl %s", IMM_PSL(pc, params)); pc+=1; break; case 0x78: case 0x79: case 0x7a: case 0x7b: util::stream_format(stream, z80 ? "call r%d-nz,%s" : "bsnr,%d %s", rv, REL(pc, params)); pc+=1; flags = STEP_OVER; break; case 0x7c: case 0x7d: case 0x7e: case 0x7f: util::stream_format(stream, z80 ? "call r%d-nz,%s" : "bsna,%d %s", rv, ADR(pc, params)); pc+=2; flags = STEP_OVER; break; case 0x80: case 0x81: case 0x82: case 0x83: util::stream_format(stream, z80 ? "add r0,r%d" : "addz,%d", rv); break; case 0x84: case 0x85: case 0x86: case 0x87: util::stream_format(stream, z80 ? "add r%d,%s" : "addi,%d %s", rv, IMM(pc, params)); pc+=1; break; case 0x88: case 0x89: case 0x8a: case 0x8b: util::stream_format(stream, z80 ? "add r%d,(%s)" : "addr,%d %s", rv, REL(pc, params)); pc+=1; break; case 0x8c: case 0x8d: case 0x8e: case 0x8f: util::stream_format(stream, z80 ? "add %s" : "adda,%s", ABS(1,rv,pc, params)); pc+=2; break; case 0x90: case 0x91: util::stream_format(stream, z80 ? "**** $%02X" : "**** $%02X",op); break; case 0x92: util::stream_format(stream, z80 ? "ld psu,r0" : "lpsu"); break; case 0x93: util::stream_format(stream, z80 ? "ld psl,r0" : "lpsl"); break; case 0x94: case 0x95: case 0x96: case 0x97: util::stream_format(stream, z80 ? "daa r%d" : "dar,%d", rv); break; case 0x98: case 0x99: case 0x9a: util::stream_format(stream, z80 ? "jr n%c,%s" : "bcfr,%c %s", cc[rv], REL(pc, params)); pc+=1; break; case 0x9b: util::stream_format(stream, z80 ? "jr0 %s" : "zbrr %s", REL0(pc, params)); pc+=1; break; case 0x9c: case 0x9d: case 0x9e: util::stream_format(stream, z80 ? "jp n%c,%s" : "bcfa,%c %s", cc[rv], ADR(pc, params)); pc+=2; break; case 0x9f: util::stream_format(stream, z80 ? "jp %s+r3" : "bxa %s", ADR(pc, params)); pc+=2; break; case 0xa0: case 0xa1: case 0xa2: case 0xa3: util::stream_format(stream, z80 ? "sub r0,r%d" : "subz,%d", rv); break; case 0xa4: case 0xa5: case 0xa6: case 0xa7: util::stream_format(stream, z80 ? "sub r%d,%s" : "subi,%d %s", rv, IMM(pc, params)); pc+=1; break; case 0xa8: case 0xa9: case 0xaa: case 0xab: util::stream_format(stream, z80 ? "sub r%d,(%s)" : "subr,%d %s", rv, REL(pc, params)); pc+=1; break; case 0xac: case 0xad: case 0xae: case 0xaf: util::stream_format(stream, z80 ? "sub %s" : "suba,%s", ABS(1,rv,pc, params)); pc+=2; break; case 0xb0: case 0xb1: case 0xb2: case 0xb3: util::stream_format(stream, z80 ? "out (ctrl),r%d" : "wrtc,%d", rv); break; case 0xb4: util::stream_format(stream, z80 ? "bit psu,%s" : "tpsu %s", IMM_PSU(pc, params)); pc+=1; break; case 0xb5: util::stream_format(stream, z80 ? "bit psl,%s" : "tpsl %s", IMM_PSL(pc, params)); pc+=1; break; case 0xb6: case 0xb7: util::stream_format(stream, z80 ? "**** $%02X" : "**** $%02X",op); break; case 0xb8: case 0xb9: case 0xba: util::stream_format(stream, z80 ? "calr n%c,%s" : "bsfr,%c %s", cc[rv], REL(pc, params)); pc+=1; flags = STEP_OVER; break; case 0xbb: util::stream_format(stream, z80 ? "cal0 %s" : "zbsr %s", REL0(pc, params)); pc+=1; flags = STEP_OVER; break; case 0xbc: case 0xbd: case 0xbe: util::stream_format(stream, z80 ? "call n%c,%s" : "bsfa,%c %s", cc[rv], ADR(pc, params)); pc+=2; flags = STEP_OVER; break; case 0xbf: util::stream_format(stream, z80 ? "call %s+r3" : "bsxa %s", ADR(pc, params)); pc+=2; flags = STEP_OVER; break; case 0xc0: util::stream_format(stream, "nop"); break; case 0xc1: case 0xc2: case 0xc3: util::stream_format(stream, z80 ? "ld r%d,r0" : "strz,%d", rv); break; case 0xc4: case 0xc5: case 0xc6: case 0xc7: util::stream_format(stream, z80 ? "**** $%02X" : "**** $%02X",op); break; case 0xc8: case 0xc9: case 0xca: case 0xcb: util::stream_format(stream, z80 ? "ld (%s),r%d" : "strr,%d %s", rv, REL(pc, params)); pc+=1; break; case 0xcc: case 0xcd: case 0xce: case 0xcf: util::stream_format(stream, z80 ? "ld %s" : "stra,%s", ABS(1,rv,pc, params)); pc+=2; break; case 0xd0: case 0xd1: case 0xd2: case 0xd3: util::stream_format(stream, z80 ? "rol r%d" : "rrl,%d", rv); break; case 0xd4: case 0xd5: case 0xd6: case 0xd7: util::stream_format(stream, z80 ? "out (%s),r%d" : "wrte,%d %s", rv, IMM(pc, params)); pc+=1; break; case 0xd8: case 0xd9: case 0xda: case 0xdb: util::stream_format(stream, z80 ? "ijnz r%d,%s" : "birr,%d %s", rv, REL(pc, params)); pc+=1; flags = STEP_OVER; break; case 0xdc: case 0xdd: case 0xde: case 0xdf: util::stream_format(stream, z80 ? "ijnz r%d,%s" : "bira,%d %s", rv, ADR(pc, params)); pc+=2; flags = STEP_OVER; break; case 0xe0: case 0xe1: case 0xe2: case 0xe3: util::stream_format(stream, z80 ? "cp r0,%d" : "comz,%d", rv); break; case 0xe4: case 0xe5: case 0xe6: case 0xe7: util::stream_format(stream, z80 ? "cp r%d,%s" : "comi,%d %s", rv, IMM(pc, params)); pc+=1; break; case 0xe8: case 0xe9: case 0xea: case 0xeb: util::stream_format(stream, z80 ? "cp r%d,(%s)" : "comr,%d %s", rv, REL(pc, params)); pc+=1; break; case 0xec: case 0xed: case 0xee: case 0xef: util::stream_format(stream, z80 ? "cp %s" : "coma,%s", ABS(1,rv,pc, params)); pc+=2; break; case 0xf0: case 0xf1: case 0xf2: case 0xf3: util::stream_format(stream, z80 ? "out (data),r%d" : "wrtd,%d", rv); break; case 0xf4: case 0xf5: case 0xf6: case 0xf7: util::stream_format(stream, z80 ? "test r%d,%s" : "tmi,%d %s", rv, IMM(pc, params)); pc+=1; break; case 0xf8: case 0xf9: case 0xfa: case 0xfb: util::stream_format(stream, z80 ? "djnz r%d,%s" : "bdrr,%d %s", rv, REL(pc, params)); pc+=1; flags = STEP_OVER; break; case 0xfc: case 0xfd: case 0xfe: case 0xff: util::stream_format(stream, z80 ? "djnz r%d,%s" : "bdra,%d %s", rv, ADR(pc, params)); pc+=2; flags = STEP_OVER; break; } return (pc - PC) | flags | SUPPORTED; } u32 s2650_disassembler::opcode_alignment() const { return 1; } u32 s2650_disassembler::interface_flags() const { return PAGED; } u32 s2650_disassembler::page_address_bits() const { return 13; }