1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
|
#include "68kinst.h"
#include <stdio.h>
#include <stdlib.h>
uint8_t visited[(16*1024*1024)/16];
void visit(uint32_t address)
{
address &= 0xFFFFFF;
visited[address/16] |= 1 << ((address / 2) % 8);
}
uint8_t is_visited(uint32_t address)
{
address &= 0xFFFFFF;
return visited[address/16] & (1 << ((address / 2) % 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;
}
#define SIMPLE 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(cur = filebuf; cur - filebuf < (filesize/2); ++cur)
{
*cur = (*cur >> 8) | (*cur << 8);
}
uint32_t address = filebuf[2] << 16 | filebuf[3], tmp_addr;
#if !SIMPLE
uint16_t *encoded, *next;
uint32_t size;
deferred *def = NULL, *tmpd;
def = defer(address, def);
def = defer(filebuf[0x68/2] << 16 | filebuf[0x6A/2], def);
def = defer(filebuf[0x70/2] << 16 | filebuf[0x72/2], def);
def = defer(filebuf[0x78/2] << 16 | filebuf[0x7A/2], def);
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);
if (instbuf.op == M68K_ILLEGAL || instbuf.op == M68K_RTS || instbuf.op == M68K_RTE) {
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;
if (is_visited(address)) {
break;
}
} else {
tmp_addr = instbuf.address + 2 + instbuf.src.params.immed;
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 {
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);
}
}
}
}
for (address = 0; address < filesize; address+=2) {
if (is_visited(address)) {
encoded = filebuf + address/2;
m68k_decode(encoded, &instbuf, address);
m68k_disasm(&instbuf, disbuf);
printf("%X: %s\n", instbuf.address, disbuf);
}
}
#else
for(cur = filebuf + 0x100; (cur - filebuf) < (filesize/2); )
{
unsigned short * start = cur;
cur = m68k_decode(cur, &instbuf, (start - filebuf)*2);
m68k_disasm(&instbuf, disbuf);
printf("%X: %s\n", instbuf.address, disbuf);
}
#endif
return 0;
}
|
