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
|
/* Written by Pace Willisson (pace@blitz.com)
* and placed in the public domain.
*/
#ifndef lint
static char rcsid[] = "$Id: dbsym.c,v 1.2 1993/09/26 16:40:41 rgrimes Exp $";
#endif /* not lint */
#include <stdio.h>
#include <stdlib.h>
#include <a.out.h>
#include <stab.h>
#include <machine/param.h>
#include <vm/vm_param.h>
#include <vm/lock.h>
#include <vm/vm_statistics.h>
#include <machine/pmap.h>
#include <machine/vmparam.h>
#define FILE_OFFSET(vadr) (((vadr) - text_adr) - N_DATADDR(hdr) + \
N_DATOFF(hdr) + N_TXTADDR(hdr))
u_int text_adr = KERNBASE;
struct nlist *old_syms;
int num_old_syms;
char *old_strtab;
int old_strtab_size;
struct nlist *new_syms;
int num_new_syms;
int new_syms_bytes;
char *new_strtab;
int new_strtab_size;
int db_symtabsize_adr;
int db_symtab_adr;
int avail;
int force = 0;
int zap_locals = 0;
int debugging = 0;
usage ()
{
fprintf (stderr, "usage: dbsym [-fgx] [-T addr] file\n");
exit (1);
}
struct exec hdr;
main (argc, argv)
char **argv;
{
FILE *f;
char *name;
extern int optind;
int c, i;
int need;
char *buf, *p;
struct nlist *nsp, *sp;
int len;
while ((c = getopt (argc, argv, "fgxT:")) != EOF) {
switch (c) {
case 'f':
force = 1;
break;
case 'g':
debugging = 1;
break;
case 'x':
zap_locals = 1;
break;
case 'T':
text_adr = strtoul(optarg, &p, 16);
if (*p)
err("illegal text address: %s", optarg);
break;
default:
usage ();
}
}
if (optind >= argc)
usage ();
name = argv[optind++];
if (optind != argc)
usage ();
if ((f = fopen (name, "r+")) == NULL) {
fprintf (stderr, "can't open %s\n", name);
exit (1);
}
if (fread ((char *)&hdr, sizeof hdr, 1, f) != 1) {
fprintf (stderr, "can't read header\n");
exit (1);
}
if (N_BADMAG (hdr)) {
fprintf (stderr, "bad magic number\n");
exit (1);
}
if (hdr.a_syms == 0) {
fprintf (stderr, "no symbols\n");
exit (1);
}
fseek (f, N_STROFF (hdr), 0);
if (fread ((char *)&old_strtab_size, sizeof (int), 1, f) != 1) {
fprintf (stderr, "can't read old strtab size\n");
exit (1);
}
if ((old_syms = (struct nlist *)malloc (hdr.a_syms)) == NULL
|| ((old_strtab = malloc (old_strtab_size)) == NULL)
|| ((new_syms = (struct nlist *)malloc (hdr.a_syms)) == NULL)
|| ((new_strtab = malloc (old_strtab_size)) == NULL)) {
fprintf (stderr, "out of memory\n");
exit (1);
}
fseek (f, N_SYMOFF (hdr), 0);
if (fread ((char *)old_syms, hdr.a_syms, 1, f) != 1) {
fprintf (stderr, "can't read symbols\n");
exit (1);
}
fseek (f, N_STROFF (hdr), 0);
if (fread ((char *)old_strtab, old_strtab_size, 1, f) != 1) {
fprintf (stderr, "can't read string table\n");
exit (1);
}
num_old_syms = hdr.a_syms / sizeof (struct nlist);
new_strtab_size = 4;
nsp = new_syms;
for (i = 0, sp = old_syms; i < num_old_syms; i++, sp++) {
if (zap_locals && !(sp->n_type & N_EXT))
continue;
if (sp->n_type & N_STAB)
switch (sp->n_type & ~N_EXT) {
case N_SLINE:
if (debugging)
*nsp++ = *sp;
continue;
case N_FUN:
case N_PSYM:
case N_SO:
if (!debugging)
continue;
goto skip_tests;
break;
default:
continue;
}
if ((sp->n_type & ~N_EXT) == N_UNDF)
continue;
if (!debugging && (sp->n_type & ~N_EXT) == N_FN)
continue;
if (sp->n_un.n_strx == 0)
continue;
if (sp->n_value < text_adr)
continue;
if (sp->n_value > (text_adr + hdr.a_text + hdr.a_data +
hdr.a_bss))
continue;
skip_tests:
name = old_strtab + sp->n_un.n_strx;
len = strlen (name);
if (len == 0)
continue;
if (strcmp (name, "gcc_compiled.") == 0)
continue;
if (strcmp (name, "gcc2_compiled.") == 0)
continue;
if (strcmp (name, "___gnu_compiled_c") == 0)
continue;
*nsp = *sp;
nsp->n_un.n_strx = new_strtab_size;
strcpy (new_strtab + new_strtab_size, name);
new_strtab_size += len + 1;
nsp++;
if (strcmp (name, "_db_symtab") == 0)
db_symtab_adr = sp->n_value;
if (strcmp (name, "_db_symtabsize") == 0)
db_symtabsize_adr = sp->n_value;
}
if (db_symtab_adr == 0 || db_symtabsize_adr == 0)
if (!force) {
fprintf (stderr, "couldn't find db_symtab symbols\n");
exit (1);
} else
exit (0);
*(int *)new_strtab = new_strtab_size;
num_new_syms = nsp - new_syms;
new_syms_bytes = num_new_syms * sizeof (struct nlist);
need = sizeof (int)
+ num_new_syms * sizeof (struct nlist)
+ new_strtab_size;
fseek (f, FILE_OFFSET (db_symtabsize_adr), 0);
if (fread ((char *)&avail, sizeof (int), 1, f) != 1) {
fprintf (stderr, "can't read symtabsize\n");
exit (1);
}
printf ("dbsym: need %d; avail %d\n", need, avail);
if (need > avail) {
fprintf (stderr, "not enough room in db_symtab array\n");
exit (1);
}
fseek (f, FILE_OFFSET (db_symtab_adr), 0);
fwrite ((char *)&new_syms_bytes, sizeof (int), 1, f);
fwrite ((char *)new_syms, new_syms_bytes, 1, f);
fwrite (new_strtab, new_strtab_size, 1, f);
fflush (f);
if (feof (f) || ferror (f)) {
fprintf (stderr, "write error\n");
exit (1);
}
exit (0);
}
|
