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// license:BSD-3-Clause
// copyright-holders:hap
/*
Mitsubishi MELPS 4 MCU family disassembler
Not counting the extra opcodes for peripherals (eg. timers, A/D),
each MCU in the series has small differences in the opcode map.
*/
#include "emu.h"
#include "debugger.h"
#include "melps4.h"
// opcode mnemonics
enum e_mnemonics
{
em_ILL,
em_TAB, em_TBA, em_TAY, em_TYA, em_TEAB, em_TABE, em_TEPA, em_TXA, em_TAX,
em_LXY, em_LZ, em_INY, em_DEY, em_LCPS, em_SADR,
em_TAM, em_XAM, em_XAMD, em_XAMI,
em_LA, em_AM, em_AMC, em_AMCS, em_A, em_SC, em_RC, em_SZC, em_CMA, em_RL, em_RR,
em_SB, em_RB, em_SZB, em_SEAM, em_SEY,
em_TLA, em_THA, em_TAJ, em_XAL, em_XAH, em_LC7, em_DEC, em_SHL, em_RHL, em_CPA, em_CPAS, em_CPAE, em_SZJ,
em_T1AB, em_TRAB, em_T2AB, em_TAB1, em_TABR, em_TAB2, em_TVA, em_TWA, em_SNZ1, em_SNZ2,
em_BA, em_SP, em_B, em_BM, em_RT, em_RTS, em_RTI,
em_CLD, em_CLS, em_CLDS, em_SD, em_RD, em_SZD, em_OSAB, em_OSPA, em_OSE, em_IAS, em_OFA, em_IAF, em_OGA, em_IAK, em_SZK, em_SU, em_RU,
em_EI, em_DI, em_INTH, em_INTL, em_NOP
};
static const char *const em_name[] =
{
"?",
"TAB", "TBA", "TAY", "TYA", "TEAB", "TABE", "TEPA", "TXA", "TAX",
"LXY", "LZ", "INY", "DEY", "LCPS", "SADR",
"TAM", "XAM", "XAMD", "XAMI",
"LA", "AM", "AMC", "AMCS", "A", "SC", "RC", "SZC", "CMA", "RL", "RR",
"SB", "RB", "SZB", "SEAM", "SEY",
"TLA", "THA", "TAJ", "XAL", "XAH", "LC7", "DEC", "SHL", "RHL", "CPA", "CPAS", "CPAE", "SZJ",
"T1AB", "TRAB", "T2AB", "TAB1", "TABR", "TAB2", "TVA", "TWA", "SNZ1", "SNZ2",
"BA", "SP", "B", "BM", "RT", "RTS", "RTI",
"CLD", "CLS", "CLDS", "SD", "RD", "SZD", "OSAB", "OSPA", "OSE", "IAS", "OFA", "IAF", "OGA", "IAK", "SZK", "SU", "RU",
"EI", "DI", "INTH", "INTL", "NOP"
};
// number of bits per opcode parameter
static const uint8_t em_bits[] =
{
0,
0, 0, 0, 0, 0, 0, 0, 0, 0,
6, 1, 0, 0, 1, 2,
2, 2, 2, 2,
4, 0, 0, 0, 4, 0, 0, 0, 0, 0, 0,
2, 2, 2, 0, 4,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 4, 7, 7, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 2, 0, 0,
0, 0, 0, 0, 0
};
#define _OVER DASMFLAG_STEP_OVER
#define _OUT DASMFLAG_STEP_OUT
static const uint32_t em_flags[] =
{
0,
0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0,
0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, _OVER, _OUT, _OUT, _OUT,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0
};
// M58846 disasm
static const uint8_t m58846_opmap[0xc0] =
{
// 0 1 2 3 4 5 6 7 8 9 A B C D E F
em_NOP, em_BA, em_INY, em_DEY, em_DI, em_EI, em_RU, em_SU, 0, em_TABE, em_AM, em_OSE, em_TYA, 0, 0, em_CMA, // 0x
em_CLS, em_CLDS, 0, em_CLD, em_RD, em_SD, em_TEPA, em_OSPA, em_RL, em_RR, em_TEAB, em_OSAB, em_TBA, em_TAY, em_TAB, 0, // 1x
em_SZB, em_SZB, em_SZB, em_SZB, 0, 0, em_SEAM, 0, 0, 0, 0, em_SZD, 0, 0, 0, em_SZC, // 2x
em_SEY, em_SEY, em_SEY, em_SEY, em_SEY, em_SEY, em_SEY, em_SEY, em_SEY, em_SEY, em_SEY, em_SEY, em_SEY, em_SEY, em_SEY, em_SEY, // 3x
em_LCPS, em_LCPS, 0, em_AMC, em_RT, em_RTS, em_RTI, 0, em_RC, em_SC, em_LZ, em_LZ, em_SB, em_SB, em_SB, em_SB, // 4x
0, 0, 0, em_AMCS, em_IAS, em_IAS, 0, em_IAK, em_SZK, em_SZK, em_SZK, em_SZK, em_RB, em_RB, em_RB, em_RB, // 5x
em_XAM, em_XAM, em_XAM, em_XAM, em_TAM, em_TAM, em_TAM, em_TAM, em_XAMD, em_XAMD, em_XAMD, em_XAMD, em_XAMI, em_XAMI, em_XAMI, em_XAMI, // 6x
em_SP, em_SP, em_SP, em_SP, em_SP, em_SP, em_SP, em_SP, em_SP, em_SP, em_SP, em_SP, em_SP, em_SP, em_SP, em_SP, // 7x
0, em_OFA, em_SNZ1, em_SNZ2, em_OGA, em_T2AB, em_TVA, 0, 0, 0, em_TAB2, 0, em_IAF, 0, 0, 0, // 8x
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 9x
em_A, em_A, em_A, em_A, em_A, em_A, em_A, em_A, em_A, em_A, em_A, em_A, em_A, em_A, em_A, em_A, // Ax
em_LA, em_LA, em_LA, em_LA, em_LA, em_LA, em_LA, em_LA, em_LA, em_LA, em_LA, em_LA, em_LA, em_LA, em_LA, em_LA // Bx
};
static offs_t internal_disasm_m58846(cpu_device *device, std::ostream &stream, offs_t pc, const uint8_t *oprom, const uint8_t *opram, int options)
{
uint16_t op = (oprom[0] | oprom[1] << 8) & 0x1ff;
// get opcode
uint8_t instr;
if (op >= 0x180)
instr = em_B;
else if (op >= 0x100)
instr = em_BM;
else if (op >= 0xc0)
instr = em_LXY;
else
instr = m58846_opmap[op];
util::stream_format(stream, "%-6s", em_name[instr]);
// get immediate param
uint8_t bits = em_bits[instr];
// special case for LXY x,y
if (instr == em_LXY)
{
uint8_t x = op >> 4 & 3;
uint8_t y = op & 0xf;
util::stream_format(stream, " %d,%d", x, y);
}
else if (bits > 0)
{
uint8_t param = op & ((1 << bits) - 1);
if (bits > 4)
util::stream_format(stream, " $%02X", param);
else
util::stream_format(stream, " %d", param);
}
return 1 | em_flags[instr] | DASMFLAG_SUPPORTED;
}
CPU_DISASSEMBLE(m58846)
{
std::ostringstream stream;
offs_t result = internal_disasm_m58846(device, stream, pc, oprom, opram, options);
std::string stream_str = stream.str();
strcpy(buffer, stream_str.c_str());
return result;
}
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