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#include "68kinst.h"
#include <stdio.h>
#include <stdlib.h>
uint8_t visited[(16*1024*1024)/16];
uint8_t label[(16*1024*1024)/8];
void visit(uint32_t address)
{
address &= 0xFFFFFF;
visited[address/16] |= 1 << ((address / 2) % 8);
}
void reference(uint32_t address)
{
address &= 0xFFFFFF;
//printf("referenced: %X\n", address);
label[address/16] |= 1 << (address % 8);
}
uint8_t is_visited(uint32_t address)
{
address &= 0xFFFFFF;
return visited[address/16] & (1 << ((address / 2) % 8));
}
uint8_t is_label(uint32_t address)
{
address &= 0xFFFFFF;
return label[address/16] & (1 << (address % 8));
}
typedef struct deferred {
uint32_t address;
struct deferred *next;
} deferred;
deferred * defer(uint32_t address, deferred * next)
{
if (is_visited(address)) {
return next;
}
//printf("deferring %X\n", address);
deferred * d = malloc(sizeof(deferred));
d->address = address;
d->next = next;
return d;
}
void check_reference(m68kinst * inst, m68k_op_info * op)
{
switch(op->addr_mode)
{
case MODE_PC_DISPLACE:
reference(inst->address + 2 + op->params.regs.displacement);
break;
case MODE_ABSOLUTE:
case MODE_ABSOLUTE_SHORT:
reference(op->params.immed);
break;
}
}
uint8_t labels = 0;
uint8_t addr = 0;
int main(int argc, char ** argv)
{
long filesize;
unsigned short *filebuf;
char disbuf[1024];
m68kinst instbuf;
unsigned short * cur;
FILE * f = fopen(argv[1], "rb");
fseek(f, 0, SEEK_END);
filesize = ftell(f);
fseek(f, 0, SEEK_SET);
filebuf = malloc(filesize);
fread(filebuf, 2, filesize/2, f);
fclose(f);
for(uint8_t opt = 2; opt < argc; ++opt) {
if (argv[opt][0] == '-') {
switch (argv[opt][1])
{
case 'l':
labels = 1;
break;
case 'a':
addr = 1;
break;
}
}
}
for(cur = filebuf; cur - filebuf < (filesize/2); ++cur)
{
*cur = (*cur >> 8) | (*cur << 8);
}
uint32_t start = filebuf[2] << 16 | filebuf[3], tmp_addr;
uint32_t int_2 = filebuf[0x68/2] << 16 | filebuf[0x6A/2];
uint32_t int_4 = filebuf[0x70/2] << 16 | filebuf[0x72/2];
uint32_t int_6 = filebuf[0x78/2] << 16 | filebuf[0x7A/2];
uint16_t *encoded, *next;
uint32_t size;
deferred *def = NULL, *tmpd;
def = defer(start, def);
def = defer(int_2, def);
def = defer(int_4, def);
def = defer(int_6, def);
uint32_t address;
while(def) {
do {
encoded = NULL;
address = def->address;
if (!is_visited(address)) {
encoded = filebuf + address/2;
}
tmpd = def;
def = def->next;
free(tmpd);
} while(def && encoded == NULL);
if (!encoded) {
break;
}
for(;;) {
if (address > filesize) {
break;
}
visit(address);
next = m68k_decode(encoded, &instbuf, address);
address += (next-encoded)*2;
encoded = next;
//m68k_disasm(&instbuf, disbuf);
//printf("%X: %s\n", instbuf.address, disbuf);
check_reference(&instbuf, &(instbuf.src));
check_reference(&instbuf, &(instbuf.dst));
if (instbuf.op == M68K_ILLEGAL || instbuf.op == M68K_RTS || instbuf.op == M68K_RTE || instbuf.op == M68K_INVALID) {
break;
} else if (instbuf.op == M68K_BCC || instbuf.op == M68K_DBCC || instbuf.op == M68K_BSR) {
if (instbuf.op == M68K_BCC && instbuf.extra.cond == COND_TRUE) {
address = instbuf.address + 2 + instbuf.src.params.immed;
encoded = filebuf + address/2;
reference(address);
if (is_visited(address)) {
break;
}
} else {
tmp_addr = instbuf.address + 2 + instbuf.src.params.immed;
reference(tmp_addr);
def = defer(tmp_addr, def);
}
} else if(instbuf.op == M68K_JMP) {
if (instbuf.src.addr_mode == MODE_ABSOLUTE || instbuf.src.addr_mode == MODE_ABSOLUTE_SHORT) {
address = instbuf.src.params.immed;
encoded = filebuf + address/2;
if (is_visited(address)) {
break;
}
} else if (instbuf.src.addr_mode = MODE_PC_DISPLACE) {
address = instbuf.src.params.regs.displacement + instbuf.address + 2;
encoded = filebuf + address/2;
if (is_visited(address)) {
break;
}
} else {
break;
}
} else if(instbuf.op == M68K_JSR) {
if (instbuf.src.addr_mode == MODE_ABSOLUTE || instbuf.src.addr_mode == MODE_ABSOLUTE_SHORT) {
def = defer(instbuf.src.params.immed, def);
} else if (instbuf.src.addr_mode = MODE_PC_DISPLACE) {
def = defer(instbuf.src.params.regs.displacement + instbuf.address + 2, def);
}
}
}
}
if (labels) {
for (address = filesize; address < (16*1024*1024); address++) {
if (is_label(address)) {
printf("ADR_%X equ $%X\n", address, address);
}
}
puts("");
}
for (address = 0; address < filesize; address+=2) {
if (is_visited(address)) {
encoded = filebuf + address/2;
m68k_decode(encoded, &instbuf, address);
if (labels) {
m68k_disasm_labels(&instbuf, disbuf);
if (address == start) {
puts("start:");
}
if(address == int_2) {
puts("int_2:");
}
if(address == int_4) {
puts("int_4:");
}
if(address == int_6) {
puts("int_6:");
}
if (is_label(instbuf.address)) {
printf("ADR_%X:\n", instbuf.address);
}
if (addr) {
printf("\t%s\t;%X\n", disbuf, instbuf.address);
} else {
printf("\t%s\n", disbuf);
}
} else {
m68k_disasm(&instbuf, disbuf);
printf("%X: %s\n", instbuf.address, disbuf);
}
}
}
return 0;
}
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