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// license:BSD-3-Clause
// copyright-holders:Sandro Ronco
/******************************************************************************
Sanyo LC8670 disassembler
******************************************************************************/
#include "emu.h"
#include "lc8670dsm.h"
u32 lc8670_disassembler::opcode_alignment() const
{
return 1;
}
const lc8670_disassembler::dasm_entry lc8670_disassembler::s_dasm_table[] =
{
{ "NOP" , OP_NULL, OP_NULL, 0 }, // 0x0*
{ "BR" , OP_R8 , OP_NULL, 0 },
{ "LD" , OP_D9 , OP_NULL, 0 },
{ "LD" , OP_RI , OP_NULL, 0 },
{ "CALL", OP_A12 , OP_NULL, 0 },
{ "CALLR", OP_R16 , OP_NULL, 0 }, // 0x1*
{ "BRF" , OP_R16 , OP_NULL, 0 },
{ "ST" , OP_D9 , OP_NULL, 0 },
{ "ST" , OP_RI , OP_NULL, 0 },
{ "CALL", OP_A12 , OP_NULL, 0 },
{ "CALLF", OP_A16 , OP_NULL, 0 }, // 0x2*
{ "JMPF", OP_A16 , OP_NULL, 0 },
{ "MOV" , OP_D9 , OP_I8 , 1 },
{ "MOV" , OP_RI , OP_I8 , 1 },
{ "JMP" , OP_A12 , OP_NULL, 0 },
{ "MUL" , OP_NULL, OP_NULL, 0 }, // 0x3*
{ "BE" , OP_I8 , OP_R8 , 0 },
{ "BE" , OP_D9 , OP_R8 , 0 },
{ "BE" , OP_RII8, OP_R8 , 0 },
{ "JMP" , OP_A12 , OP_NULL, 0 },
{ "DIV" , OP_NULL, OP_NULL, 0 }, // 0x4*
{ "BNE" , OP_I8 , OP_R8 , 0 },
{ "BNE" , OP_D9 , OP_R8 , 0 },
{ "BNE" , OP_RII8, OP_R8 , 0 },
{ "BPC" , OP_D9B3, OP_R8 , 0 },
{ "LDF" , OP_NULL, OP_NULL, 0 }, // 0x5*
{ "STF" , OP_NULL, OP_NULL, 0 },
{ "DBNZ", OP_D9 , OP_R8 , 0 },
{ "DBNZ", OP_RI , OP_R8RI, 0 },
{ "BPC" , OP_D9B3, OP_R8 , 0 },
{ "PUSH", OP_D9 , OP_NULL, 0 }, // 0x6*
{ "PUSH", OP_D9 , OP_NULL, 0 },
{ "INC" , OP_D9 , OP_NULL, 0 },
{ "INC" , OP_RI , OP_NULL, 0 },
{ "BP" , OP_D9B3, OP_R8 , 0 },
{ "POP" , OP_D9 , OP_NULL, 0 }, // 0x7*
{ "POP" , OP_D9 , OP_NULL, 0 },
{ "DEC" , OP_D9 , OP_NULL, 0 },
{ "DEC" , OP_RI , OP_NULL, 0 },
{ "BP" , OP_D9B3, OP_R8 , 0 },
{ "BZ" , OP_R8 , OP_NULL, 0 }, // 0x8*
{ "ADD" , OP_I8 , OP_NULL, 0 },
{ "ADD" , OP_D9 , OP_NULL, 0 },
{ "ADD" , OP_RI , OP_NULL, 0 },
{ "BN" , OP_D9B3, OP_R8 , 0 },
{ "BNZ" , OP_R8 , OP_NULL, 0 }, // 0x9*
{ "ADDC", OP_I8 , OP_NULL, 0 },
{ "ADDC", OP_D9 , OP_NULL, 0 },
{ "ADDC", OP_RI , OP_NULL, 0 },
{ "BN" , OP_D9B3, OP_R8 , 0 },
{ "RET" , OP_NULL, OP_NULL, 0 }, // 0xa*
{ "SUB" , OP_I8 , OP_NULL, 0 },
{ "SUB" , OP_D9 , OP_NULL, 0 },
{ "SUB" , OP_RI , OP_NULL, 0 },
{ "NOT1", OP_D9B3, OP_NULL, 0 },
{ "RETI", OP_NULL, OP_NULL, 0 }, // 0xb*
{ "SUBC", OP_I8 , OP_NULL, 0 },
{ "SUBC", OP_D9 , OP_NULL, 0 },
{ "SUBC", OP_RI , OP_NULL, 0 },
{ "NOT1", OP_D9B3, OP_NULL, 0 },
{ "ROR" , OP_NULL, OP_NULL, 0 }, // 0xc*
{ "LDC" , OP_NULL, OP_NULL, 0 },
{ "XCH" , OP_D9 , OP_NULL, 0 },
{ "XCH" , OP_RI , OP_NULL, 0 },
{ "CLR1", OP_D9B3, OP_NULL, 0 },
{ "RORC", OP_NULL, OP_NULL, 0 }, // 0xd*
{ "OR" , OP_I8 , OP_NULL, 0 },
{ "OR" , OP_D9 , OP_NULL, 0 },
{ "OR" , OP_RI , OP_NULL, 0 },
{ "CLR1", OP_D9B3, OP_NULL, 0 },
{ "ROL" , OP_NULL, OP_NULL, 0 }, // 0xe*
{ "AND" , OP_I8 , OP_NULL, 0 },
{ "AND" , OP_D9 , OP_NULL, 0 },
{ "AND" , OP_RI , OP_NULL, 0 },
{ "SET1", OP_D9B3, OP_NULL, 0 },
{ "ROLC", OP_NULL, OP_NULL, 0 }, // 0xf*
{ "XOR" , OP_I8 , OP_NULL, 0 },
{ "XOR" , OP_D9 , OP_NULL, 0 },
{ "XOR" , OP_RI , OP_NULL, 0 },
{ "SET1", OP_D9B3, OP_NULL, 0 },
};
void lc8670_disassembler::dasm_arg(uint8_t op, char *buffer, offs_t pc, int arg, const data_buffer &opcodes, offs_t &pos)
{
switch( arg )
{
case OP_NULL:
buffer[0] = '\0';
break;
case OP_R8:
pc++;
[[fallthrough]];
case OP_R8RI:
buffer += sprintf(buffer, "%04x", (pc + 1 + opcodes.r8(pos) - (opcodes.r8(pos)&0x80 ? 0x100 : 0)) & 0xffff);
pos++;
break;
case OP_R16:
buffer += sprintf(buffer, "%04x", (pc + 2 + ((opcodes.r8(pos+1)<<8) | opcodes.r8(pos))) & 0xffff);
pos += 2;
break;
case OP_RI:
buffer += sprintf(buffer, "@%x", op & 0x03);
break;
case OP_A12:
buffer += sprintf(buffer, "%04x", ((pc + 2) & 0xf000) | ((op & 0x10)<<7) | ((op & 0x07)<<8) | opcodes.r8(pos));
pos++;
break;
case OP_A16:
buffer += sprintf(buffer, "%04x", (opcodes.r8(pos)<<8) | opcodes.r8(pos+1));
pos += 2;
break;
case OP_I8:
buffer += sprintf(buffer, "#$%02x", opcodes.r8(pos++));
break;
case OP_B3:
buffer += sprintf(buffer, "%x", op & 0x07);
break;
case OP_D9:
buffer += sprintf(buffer, "($%03x)", ((op & 0x01)<<8) | opcodes.r8(pos));
pos++;
break;
case OP_D9B3:
buffer += sprintf(buffer, "($%03x)", ((op & 0x10)<<4) | opcodes.r8(pos));
buffer += sprintf(buffer, ",%x", op & 0x07);
pos++;
break;
case OP_RII8:
buffer += sprintf(buffer, "@%x", op & 0x03);
buffer += sprintf(buffer, ",#$%02x", opcodes.r8(pos));
pos++;
break;
}
}
//-------------------------------------------------
// disassemble - call the disassembly
// helper function
//-------------------------------------------------
offs_t lc8670_disassembler::disassemble(std::ostream &stream, offs_t pc, const data_buffer &opcodes, const data_buffer ¶ms)
{
offs_t pos = pc;
char arg1[16], arg2[16];
uint8_t op = opcodes.r8(pos++);
int idx;
switch (op & 0x0f)
{
case 0: case 1:
idx = op & 0x0f;
break;
case 2: case 3:
idx = 2;
break;
case 4: case 5: case 6: case 7:
idx = 3;
break;
default:
idx = 4;
break;
}
int op_idx = ((op>>4) & 0x0f) * 5 + idx;
const dasm_entry *inst = &s_dasm_table[op_idx];
util::stream_format(stream, "%-8s", inst->str);
dasm_arg(op, inst->inv ? arg2 : arg1, pc+0, inst->arg1, opcodes, pos);
dasm_arg(op, inst->inv ? arg1 : arg2, pc+1, inst->arg2, opcodes, pos);
stream << arg1;
if (inst->arg2 != OP_NULL)
stream << "," << arg2;
return pos - pc;
}
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