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
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
|
/*
* Pre-resolve references inside an object file.
* Mark such functions static so that linking with
* other object files can't get at them.
* Also rename "main".
*/
#include <u.h>
#include <libc.h>
#include <bio.h>
#include "/sys/src/cmd/8c/8.out.h"
typedef struct Sym Sym;
struct Sym
{
char *name;
char *newname;
short type;
short version;
Sym *link;
};
typedef struct Obj Obj;
struct Obj
{
int fd;
int version;
uchar *bp;
uchar *ep;
char *name;
};
enum
{
NHASH = 10007
};
Sym *hash[NHASH];
int nsymbol;
int renamemain = 1;
Sym *xsym[256];
int version = 1;
Obj **obj;
int nobj;
Biobuf bout;
char *prefix;
int verbose;
void *emalloc(ulong);
Sym *lookup(char*, int);
Obj *openobj(char*);
void walkobj(Obj*, void (*fn)(int, Sym*, uchar*, int));
void walkobjs(void (*fn)(int, Sym*, uchar*, int));
void dump(int, Sym*, uchar*, int);
void nop(int, Sym*, uchar*, int);
void owrite(int, Sym*, uchar*, int);
int zaddr(uchar*, Sym**);
void renamesyms(int, Sym*, uchar*, int);
void
usage(void)
{
fprint(2, "usage: 8prefix [-mv] prefix file.8...\n");
exits("usage");
}
void
main(int argc, char **argv)
{
int i;
Obj *o;
ARGBEGIN{
case 'm':
renamemain = 0;
break;
case 'v':
verbose = 1;
break;
default:
usage();
}ARGEND
if(argc < 2)
usage();
prefix = argv[0];
argv++;
argc--;
nobj = argc;
obj = emalloc(nobj*sizeof obj[0]);
for(i=0; i<argc; i++)
obj[i] = openobj(argv[i]);
walkobjs(nop); /* initialize symbol table */
if(verbose)
walkobjs(dump);
walkobjs(renamesyms);
for(i=0; i<nobj; i++){
o = obj[i];
seek(o->fd, 0, 0);
Binit(&bout, o->fd, OWRITE);
walkobj(o, owrite);
Bflush(&bout);
}
exits(0);
}
void
renamesyms(int op, Sym *sym, uchar*, int)
{
if(sym && sym->version==0 && !sym->newname)
switch(op){
case AGLOBL:
case AINIT:
case ADATA:
case ATEXT:
if(!renamemain && strcmp(sym->name, "main") == 0)
break;
sym->newname = smprint("%s%s", prefix, sym->name);
break;
}
}
void
dump(int op, Sym *sym, uchar*, int)
{
if(sym && sym->version==0)
switch(op){
case AGLOBL:
case AINIT:
case ADATA:
case ATEXT:
print("%s\n", sym->name);
break;
}
}
void
nop(int, Sym*, uchar*, int)
{
}
void
owrite(int op, Sym *sym, uchar *p, int l)
{
switch(op){
case ASIGNAME:
Bwrite(&bout, p, 4);
p += 4;
l -= 4;
case ANAME:
if(sym->newname){
Bwrite(&bout, p, 4);
Bwrite(&bout, sym->newname, strlen(sym->newname)+1);
break;
}
default:
Bwrite(&bout, p, l);
break;
}
}
int
zaddr(uchar *p, Sym **symp)
{
int c, t;
t = p[0];
c = 1;
if(t & T_INDEX)
c += 2;
if(t & T_OFFSET)
c += 4;
if(t & T_SYM){
if(symp)
*symp = xsym[p[c]];
c++;
}
if(t & T_FCONST)
c += 8;
else if(t & T_SCONST)
c += NSNAME;
if(t & T_TYPE)
c++;
return c;
}
void*
emalloc(ulong n)
{
void *v;
v = mallocz(n, 1);
if(v == nil)
sysfatal("out of memory");
return v;
}
Sym*
lookup(char *symb, int v)
{
Sym *s;
char *p;
long h;
int l, c;
h = v;
for(p=symb; c = *p; p++)
h = h+h+h + c;
l = (p - symb) + 1;
if(h < 0)
h = ~h;
h %= NHASH;
for(s = hash[h]; s != nil; s = s->link)
if(s->version == v)
if(memcmp(s->name, symb, l) == 0)
return s;
s = emalloc(sizeof *s);
s->name = emalloc(l + 1);
memmove(s->name, symb, l);
s->link = hash[h];
s->type = 0;
s->version = v;
hash[h] = s;
nsymbol++;
return s;
}
Obj*
openobj(char *name)
{
Dir *d;
Obj *obj;
obj = emalloc(sizeof *obj);
obj->name = name;
obj->version = version++;
if((obj->fd = open(name, ORDWR)) < 0)
sysfatal("open %s: %r", name);
if((d = dirfstat(obj->fd)) == nil)
sysfatal("dirfstat: %r");
obj->bp = emalloc(d->length);
if(readn(obj->fd, obj->bp, d->length) != d->length)
sysfatal("read %s: %r", name);
obj->ep = obj->bp+d->length;
return obj;
}
void
walkobjs(void (*fn)(int, Sym*, uchar*, int))
{
int i;
for(i=0; i<nobj; i++)
walkobj(obj[i], fn);
}
void
walkobj(Obj *obj, void (*fn)(int, Sym*, uchar*, int))
{
int op, type;
Sym *sym;
uchar *p, *p0;
for(p=obj->bp; p+4<=obj->ep; ){
op = p[0] | (p[1]<<8);
if(op <= AXXX || op >= ALAST)
sysfatal("%s: opcode out of range - probably not a .8 file", obj->name);
p0 = p;
switch(op){
case ASIGNAME:
p += 4; /* sign */
case ANAME:
type = p[2];
sym = lookup((char*)p+4, type==D_STATIC ? obj->version : 0);
xsym[p[3]] = sym;
p += 4+strlen(sym->name)+1;
fn(op, sym, p0, p-p0);
break;
default:
p += 6;
p += zaddr(p, &sym);
p += zaddr(p, nil);
fn(op, sym, p0, p-p0);
break;
}
}
}
|
