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// license:BSD-3-Clause
// copyright-holders:hap
/*
National Semiconductor COPS(MM57 MCU family) disassembler
*/
#include "emu.h"
#include "cops1d.h"
// constructor
cops1_common_disassembler::cops1_common_disassembler()
{
// init lfsr pc lut
for (u32 i = 0, pc = 0; i < 0x40; i++)
{
m_l2r[i] = pc;
m_r2l[pc] = i;
pc = increment_pc(pc);
}
}
offs_t cops1_common_disassembler::increment_pc(offs_t pc)
{
int feed = ((pc & 0x3e) == 0) ? 1 : 0;
feed ^= (pc >> 1 ^ pc) & 1;
return (pc & ~0x3f) | (pc >> 1 & 0x1f) | (feed << 5);
}
// common lookup tables
const char *const cops1_common_disassembler::s_name[] =
{
"?",
"AD", "ADD", "SUB", "COMP", "0TA", "ADX", "HXA", "TAM", "SC", "RSC", "TC",
"TIN", "TF", "TKB", "TIR",
"BTD", "DSPA", "DSPS", "AXO", "LDF", "READ",
"GO", "CALL", "RET", "RETS", "LG/GO", "LG/CALL", "NOP",
"EXC", "EXCM", "EXCP", "MTA", "LM",
"SM", "SM", "SM", "SM", "RSM", "RSM", "RSM", "RSM", "TM",
"LB", "LBL", "ATB", "BTA", "HXBR"
};
// bitmask for opcode parameter
const u8 cops1_common_disassembler::s_bits[] =
{
0,
0, 0, 0, 0, 0, 0x0f, 0, 0, 0, 0, 0,
0, 0x30, 0, 0,
0, 0, 0, 0, 0xff, 0,
0x3f, 0x3f, 0, 0, 0xff, 0xff, 0,
0x30, 0x30, 0x30, 0x30, 0x0f,
0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03,
0x3f, 0xff, 0, 0, 0
};
const u32 cops1_common_disassembler::s_flags[] =
{
0,
0, STEP_COND, STEP_COND, 0, 0, STEP_COND, 0, STEP_COND, 0, 0, STEP_COND,
STEP_COND, STEP_COND, STEP_COND, STEP_COND,
0, 0, 0, 0, 0, 0,
0, STEP_OVER, STEP_OUT, STEP_OUT, 0, STEP_OVER, 0,
0, STEP_COND, STEP_COND, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0
};
// common disasm
offs_t cops1_common_disassembler::common_disasm(const u8 *lut_opmap, std::ostream &stream, offs_t pc, const data_buffer &opcodes, const data_buffer ¶ms)
{
// get raw opcode
u8 op = opcodes.r8(pc);
u8 instr = lut_opmap[op];
int len = 1;
// get parameter
u8 mask = s_bits[instr];
u16 param = op & mask;
if (mask == 0x30)
{
mask >>= 4;
param >>= 4;
}
// 2-byte instructions
else if (mask == 0xff)
{
pc = increment_pc(pc);
u8 arg = params.r8(pc);
len++;
if (instr == em_LG)
{
// bit 6 indicates GO or CALL
if (~arg & 0x40)
instr++;
param = (~param << 7 & 0x780) | (arg >> 1 & 0x40) | (arg & 0x3f);
}
else
param = arg;
}
// disassemble it
util::stream_format(stream, "%-8s", s_name[instr]);
if (mask > 0)
{
if (mask < 16)
{
// SM and RSM param is scrambled
if (instr >= em_SM1 && instr <= em_SM8)
param = instr - em_SM1;
else if (instr >= em_RSM1 && instr <= em_RSM8)
param = instr - em_RSM1;
// memory bit opcodes are 1,2,4,8
if (instr >= em_SM1 && instr <= em_TM)
param = 1 << param;
// TF is 1,2,3,4
else if (instr == em_TF)
param++;
// EXC type instructions omit param if it's 0
if (!(param == 0 && (instr == em_EXC || instr == em_EXCM || instr == em_EXCP || instr == em_MTA)))
util::stream_format(stream, "%d", param);
}
else
{
// exception for LG
if (instr == em_LG || instr == em_LGCALL)
util::stream_format(stream, "$%02X,$%02X", param >> 6, param & 0x3f);
// exception for LB/LBL
else if (instr == em_LB || instr == em_LBL)
{
// LB x,10 is 0 by default
if (instr == em_LB && (param & 0xf) == 10)
param &= 0x30;
util::stream_format(stream, "%d,%d", param >> 4, param & 0xf);
}
else
util::stream_format(stream, "$%02X", param);
}
}
return len | s_flags[instr] | SUPPORTED;
}
// MM5799 disasm
const u8 mm5799_disassembler::mm5799_opmap[0x100] =
{
/* 0 1 2 3 4 5 6 7 8 9 A B C D E F */
em_NOP, em_HXBR, em_ADD, em_SC, em_TF, em_TIR, em_MTA, em_EXC, em_EXCM, em_EXCP, em_LB, em_LB, em_LB, em_LB, em_LB, em_LB, // 0
em_DSPA, em_DSPS, em_AD, em_LBL, em_TF, em_TKB, em_MTA, em_EXC, em_EXCM, em_EXCP, em_LB, em_LB, em_LB, em_LB, em_LB, em_LB, // 1
em_COMP, em_AXO, em_SUB, em_RSC, em_TF, em_BTD, em_MTA, em_EXC, em_EXCM, em_EXCP, em_LB, em_LB, em_LB, em_LB, em_LB, em_LB, // 2
em_0TA, em_HXA, em_TAM, em_LDF, em_READ, em_TIN, em_MTA, em_EXC, em_EXCM, em_EXCP, em_LB, em_LB, em_LB, em_LB, em_LB, em_LB, // 3
em_RET, em_RETS, em_RSM8, em_BTA, em_TM, em_TM, em_TM, em_TM, em_RSM1, em_SM1, em_SM8, em_RSM4, em_RSM2, em_TC, em_SM2, em_SM4, // 4
em_ATB, em_ADX, em_ADX, em_ADX, em_ADX, em_ADX, em_ADX, em_ADX, em_ADX, em_ADX, em_ADX, em_ADX, em_ADX, em_ADX, em_ADX, em_ADX, // 5
em_LG, em_LG, em_LG, em_LG, em_LG, em_LG, em_LG, em_LG, em_LG, em_LG, em_LG, em_LG, em_LG, em_LG, em_LG, em_LG, // 6
em_LM, em_LM, em_LM, em_LM, em_LM, em_LM, em_LM, em_LM, em_LM, em_LM, em_LM, em_LM, em_LM, em_LM, em_LM, em_LM, // 7
em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, // 8
em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, // 9
em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, // A
em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, em_CALL, // B
em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, // C
em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, // D
em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, // E
em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO, em_GO // F
};
offs_t mm5799_disassembler::disassemble(std::ostream &stream, offs_t pc, const data_buffer &opcodes, const data_buffer ¶ms)
{
return common_disasm(mm5799_opmap, stream, pc, opcodes, params);
}
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