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// license:BSD-3-Clause
// copyright-holders:Tony La Porta
/**************************************************************************\
* Microchip PIC16C5x Emulator *
* *
* Copyright Tony La Porta *
* Originally written for the MAME project. *
* *
* *
* Addressing architecture is based on the Harvard addressing scheme. *
* *
* Many thanks to those involved in the i8039 Disassembler *
* as this was based on it. *
* *
* *
* *
* A Address to jump to. *
* B Bit address within an 8-bit file register. *
* D Destination select (0 = store result in W (accumulator)) *
* (1 = store result in file register) *
* F Register file address (00-1F). *
* K Literal field, constant data. *
* *
\**************************************************************************/
#include "emu.h"
#include "16c5xdsm.h"
#include <cctype>
#include <stdexcept>
const char *const pic16c5x_disassembler::regfile[32] = { "Reg$00 (IND)", "Reg$01 (TMR)", "Reg$02 (PCL)", "Reg$03 (ST)", "Reg$04 (FSR)", "Reg$05 (PTA)", "Reg$06 (PTB)", "Reg$07 (PTC)",
"Reg$08", "Reg$09", "Reg$0A", "Reg$0B", "Reg$0C", "Reg$0D", "Reg$0E", "Reg$0F",
"Reg$10", "Reg$11", "Reg$12", "Reg$13", "Reg$14", "Reg$15", "Reg$16", "Reg$17",
"Reg$18", "Reg$19", "Reg$1A", "Reg$1B", "Reg$1C", "Reg$1D", "Reg$1E", "Reg$1F" };
const char *const pic16c5x_disassembler::dest[2] = { "W", "Reg" };
const char *const pic16c5x_disassembler::PIC16C5xFormats[] = {
"000000000000", "nop",
"000000000010", "option",
"000000000011", "sleep",
"000000000100", "clrwdt",
"000000000101", "tris Port A",
"000000000110", "tris Port B",
"000000000111", "tris Port C",
"0000001fffff", "movwf %F",
"000001000000", "clrw",
"0000011fffff", "clrf %F",
"000010dfffff", "subwf %F,%D",
"000011dfffff", "decf %F,%D",
"000100dfffff", "iorwf %F,%D",
"000101dfffff", "andwf %F,%D",
"000110dfffff", "xorwf %F,%D",
"000111dfffff", "addwf %F,%D",
"001000dfffff", "movf %F,%D",
"001001dfffff", "comf %F,%D",
"001010dfffff", "incf %F,%D",
"001011dfffff", "decfsz %F,%D",
"001100dfffff", "rrf %F,%D",
"001101dfffff", "rlf %F,%D",
"001110dfffff", "swapf %F,%D",
"001111dfffff", "incfsz %F,%D",
"0100bbbfffff", "bcf %F,%B",
"0101bbbfffff", "bsf %F,%B",
"0110bbbfffff", "btfsc %F,%B",
"0111bbbfffff", "btfss %F,%B",
"1000kkkkkkkk", "retlw %K",
"1001aaaaaaaa", "call %A",
"101aaaaaaaaa", "goto %A",
"1100kkkkkkkk", "movlw %K",
"1101kkkkkkkk", "iorlw %K",
"1110kkkkkkkk", "andlw %K",
"1111kkkkkkkk", "xorlw %K",
nullptr
};
pic16c5x_disassembler::pic16c5x_disassembler()
{
const char *p;
const char *const *ops;
u16 mask, bits;
int bit;
int i;
ops = PIC16C5xFormats; i = 0;
while (*ops)
{
p = *ops;
mask = 0; bits = 0; bit = 11;
while (*p && bit >= 0)
{
switch (*p++)
{
case '1': mask |= 1<<bit; bits |= 1<<bit; bit--; break;
case '0': mask |= 1<<bit; bit--; break;
case ' ': break;
case 'a':
case 'b':
case 'd':
case 'f':
case 'k':
bit--;
break;
default:
throw std::logic_error(util::string_format("Invalid instruction encoding '%s %s'\n", ops[0],ops[1]));
}
}
if (bit != -1 )
{
throw std::logic_error(util::string_format("not enough bits in encoding '%s %s' %d\n", ops[0],ops[1],bit));
}
while (isspace((uint8_t)*p)) p++;
Op.emplace_back(mask, bits, *p, ops[0], ops[1]);
ops += 2;
i++;
}
}
offs_t pic16c5x_disassembler::disassemble(std::ostream &stream, offs_t pc, const data_buffer &opcodes, const data_buffer ¶ms)
{
int a, b, d, f, k; /* these can all be filled in by parsing an instruction */
int i;
int op;
int cnt = 1;
int code;
int bit;
//char *buffertmp;
const char *cp; /* character pointer in OpFormats */
uint32_t flags = 0;
op = -1; /* no matching opcode */
code = opcodes.r16(pc);
for ( i = 0; i < int(Op.size()); i++)
{
if ((code & Op[i].mask) == Op[i].bits)
{
if (op != -1)
{
osd_printf_debug("Error: opcode %04Xh matches %d (%s) and %d (%s)\n",
code,i,Op[i].fmt,op,Op[op].fmt);
}
op = i;
}
}
if (op == -1)
{
util::stream_format(stream, "???? dw %04Xh",code);
return cnt | SUPPORTED;
}
//buffertmp = buffer;
if (Op[op].extcode) /* Actually, theres no double length opcodes */
{
bit = 27;
code <<= 16;
code |= params.r16(pc+cnt);
cnt++;
}
else
{
bit = 11;
}
/* shift out operands */
cp = Op[op].parse;
a = b = d = f = k = 0;
while (bit >= 0)
{
/* osd_printf_debug("{%c/%d}",*cp,bit); */
switch (*cp)
{
case 'a': a <<=1; a |= ((code & (1<<bit)) ? 1 : 0); bit--; break;
case 'b': b <<=1; b |= ((code & (1<<bit)) ? 1 : 0); bit--; break;
case 'd': d <<=1; d |= ((code & (1<<bit)) ? 1 : 0); bit--; break;
case 'f': f <<=1; f |= ((code & (1<<bit)) ? 1 : 0); bit--; break;
case 'k': k <<=1; k |= ((code & (1<<bit)) ? 1 : 0); bit--; break;
case ' ': break;
case '1': case '0': bit--; break;
case '\0': throw std::logic_error(util::string_format("premature end of parse string, opcode %x, bit = %d\n",code,bit));
}
cp++;
}
/* now traverse format string */
cp = Op[op].fmt;
if (!strncmp(cp, "call", 4))
flags = STEP_OVER;
else if (!strncmp(cp, "ret", 3))
flags = STEP_OUT;
while (*cp)
{
if (*cp == '%')
{
cp++;
switch (*cp++)
{
case 'A': util::stream_format(stream, "$%03X", a); break;
case 'B': util::stream_format(stream, "%d", b); break;
case 'D': util::stream_format(stream, "%s", dest[d]); break;
case 'F': util::stream_format(stream, "%s", regfile[f]); break;
case 'K': util::stream_format(stream, "%02Xh", k); break;
default:
throw std::logic_error(util::string_format("illegal escape character in format '%s'\n",Op[op].fmt));
}
}
else
{
stream << *cp++;
}
}
return cnt | flags | SUPPORTED;
}
uint32_t pic16c5x_disassembler::opcode_alignment() const
{
return 1;
}
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