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// license:BSD-3-Clause
// copyright-holders:Miodrag Milanovic
/*****************************************************************************
*
* 8008dasm.c
*
* Intel 8008 CPU Disassembly
*
*****************************************************************************/
#include "emu.h"
#include "8008dasm.h"
const char i8008_disassembler::reg[] = { 'a', 'b', 'c', 'd', 'e', 'h', 'l', 'm' };
const char i8008_disassembler::flag_names[] = { 'c', 'z', 's', 'p' };
u32 i8008_disassembler::opcode_alignment() const
{
return 1;
}
offs_t i8008_disassembler::disassemble(std::ostream &stream, offs_t pc, const data_buffer &opcodes, const data_buffer ¶ms)
{
uint32_t flags = 0;
unsigned PC = pc;
uint8_t op = opcodes.r8(pc++);
switch (op >> 6)
{
case 0x03: // starting with 11
if (op==0xff) {
util::stream_format(stream, "hlt");
} else {
util::stream_format(stream, "l%c%c",reg[(op >> 3) & 7],reg[op & 7]);
}
break;
case 0x00: // starting with 00
switch(op & 7) {
case 0 : if(((op >> 3) & 7)==0) {
util::stream_format(stream, "hlt");
} else {
if(((op >> 3) & 7)==7) {
util::stream_format(stream, "illegal");
} else {
util::stream_format(stream, "in%c",reg[(op >> 3) & 7]);
}
}
break;
case 1 : if(((op >> 3) & 7)==0) {
util::stream_format(stream, "hlt");
} else {
if(((op >> 3) & 7)==7) {
util::stream_format(stream, "illegal");
} else {
util::stream_format(stream, "dc%c",reg[(op >> 3) & 7]);
}
}
break;
case 2 : {
switch((op >> 3) & 7) {
case 0 : util::stream_format(stream, "rlc"); break;
case 1 : util::stream_format(stream, "rrc"); break;
case 2 : util::stream_format(stream, "ral"); break;
case 3 : util::stream_format(stream, "rar"); break;
default : util::stream_format(stream, "illegal"); break;
}
}
break;
case 3 : util::stream_format(stream, "r%c%c",(BIT(op,5) ? 't' : 'f'),flag_names[(op>>3)&3]); flags = STEP_OUT | STEP_COND; break;
case 4 : {
switch((op >> 3) & 7) {
case 0 : util::stream_format(stream, "adi %02x",params.r8(pc)); pc++; break;
case 1 : util::stream_format(stream, "aci %02x",params.r8(pc)); pc++; break;
case 2 : util::stream_format(stream, "sui %02x",params.r8(pc)); pc++; break;
case 3 : util::stream_format(stream, "sbi %02x",params.r8(pc)); pc++; break;
case 4 : util::stream_format(stream, "ndi %02x",params.r8(pc)); pc++; break;
case 5 : util::stream_format(stream, "xri %02x",params.r8(pc)); pc++; break;
case 6 : util::stream_format(stream, "ori %02x",params.r8(pc)); pc++; break;
case 7 : util::stream_format(stream, "cpi %02x",params.r8(pc)); pc++; break;
}
}
break;
case 5 : util::stream_format(stream, "rst %02x",(op>>3) & 7); break;
case 6 : util::stream_format(stream, "l%ci %02x",reg[(op >> 3) & 7],params.r8(pc)); pc++; break;
case 7 : util::stream_format(stream, "ret"); flags = STEP_OUT; break;
}
break;
case 0x01: // starting with 01
switch(op & 7) {
case 0 : util::stream_format(stream, "j%c%c %02x%02x",(BIT(op,5)? 't' : 'f'),flag_names[(op>>3)&3], params.r8(pc+1) & 0x3f,params.r8(pc)); pc+=2; flags = STEP_COND; break;
case 2 : util::stream_format(stream, "c%c%c %02x%02x",(BIT(op,5)? 't' : 'f'),flag_names[(op>>3)&3], params.r8(pc+1) & 0x3f,params.r8(pc)); pc+=2; flags = STEP_OVER | STEP_COND; break;
case 4 : util::stream_format(stream, "jmp %02x%02x",params.r8(pc+1) & 0x3f,params.r8(pc)); pc+=2; break;
case 6 : util::stream_format(stream, "cal %02x%02x",params.r8(pc+1) & 0x3f,params.r8(pc)); pc+=2; flags = STEP_OVER; break;
case 1 :
case 3 :
case 5 :
case 7 : if (((op>>4)&3)==0) {
util::stream_format(stream, "inp %02x",(op >> 1) & 0x07);
} else {
util::stream_format(stream, "out %02x",(op >> 1) & 0x1f);
}
break;
}
break;
case 0x02: // starting with 10
switch((op >> 3) & 7) {
case 0 : util::stream_format(stream, "ad%c",reg[op & 7]); break;
case 1 : util::stream_format(stream, "ac%c",reg[op & 7]); break;
case 2 : util::stream_format(stream, "su%c",reg[op & 7]); break;
case 3 : util::stream_format(stream, "sb%c",reg[op & 7]); break;
case 4 : util::stream_format(stream, "nd%c",reg[op & 7]); break;
case 5 : util::stream_format(stream, "xr%c",reg[op & 7]); break;
case 6 : util::stream_format(stream, "or%c",reg[op & 7]); break;
case 7 : util::stream_format(stream, "cp%c",reg[op & 7]); break;
}
break;
}
return (pc - PC) | flags | SUPPORTED;
}
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