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
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
|
/* $NetBSD: db_aout.c,v 1.12 1994/10/09 08:19:31 mycroft Exp $ */
/*
* Mach Operating System
* Copyright (c) 1991,1990 Carnegie Mellon University
* All Rights Reserved.
*
* Permission to use, copy, modify and distribute this software and its
* documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie the
* rights to redistribute these changes.
*/
#include <sys/types.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <machine/db_machdep.h> /* data types */
#include <ddb/db_sym.h>
#ifndef DB_NO_AOUT
#define _AOUT_INCLUDE_
#include <nlist.h>
#include <stab.h>
/*
* An a.out symbol table as loaded into the kernel debugger:
*
* symtab -> size of symbol entries, in bytes
* sp -> first symbol entry
* ...
* ep -> last symbol entry + 1
* strtab == start of string table
* size of string table in bytes,
* including this word
* -> strings
*/
#ifdef SYMTAB_SPACE
int db_symtabsize = SYMTAB_SPACE;
int db_symtab[SYMTAB_SPACE/sizeof(int)] = { 0, 1 };
#endif
/*
* Find the symbol table and strings; tell ddb about them.
*/
X_db_sym_init(symtab, esymtab, name)
int * symtab; /* pointer to start of symbol table */
char * esymtab; /* pointer to end of string table,
for checking - rounded up to integer
boundary */
char * name;
{
register struct nlist *sym_start, *sym_end;
register struct nlist *sp;
register char * strtab;
register int strlen;
char * estrtab;
#ifdef SYMTAB_SPACE
if (*symtab < sizeof(int)) {
printf ("DDB: no symbols\n");
return;
}
#endif
/*
* Find pointers to the start and end of the symbol entries,
* given a pointer to the start of the symbol table.
*/
sym_start = (struct nlist *)(symtab + 1);
sym_end = (struct nlist *)((char *)sym_start + *symtab);
strtab = (char *)sym_end;
strlen = *(int *)strtab;
#ifdef SYMTAB_SPACE
printf("DDB: found symbols [%d + %d bytes]\n",
*symtab, strlen);
if ((*symtab + strlen) > db_symtabsize) {
printf("DDB: symbols larger than SYMTAB_SPACE?\n");
return;
}
#else
estrtab = strtab + strlen;
#define round_to_size(x) \
(((vm_offset_t)(x) + sizeof(vm_size_t) - 1) & ~(sizeof(vm_size_t) - 1))
if (round_to_size(estrtab) != round_to_size(esymtab)) {
db_printf("[ %s symbol table not valid ]\n", name);
return;
}
#undef round_to_size
#endif
for (sp = sym_start; sp < sym_end; sp++) {
register int strx;
strx = sp->n_un.n_strx;
if (strx != 0) {
if (strx > strlen) {
db_printf("Bad string table index (%#x)\n", strx);
sp->n_un.n_name = 0;
continue;
}
sp->n_un.n_name = strtab + strx;
}
}
if (db_add_symbol_table((char *)sym_start, (char *)sym_end, name,
(char *)symtab) != -1) {
#ifndef SYMTAB_SPACE
db_printf("[ preserving %d bytes of %s symbol table ]\n",
esymtab - (char *)symtab, name);
#endif
}
}
db_sym_t
X_db_lookup(stab, symstr)
db_symtab_t *stab;
char * symstr;
{
register struct nlist *sp, *ep;
sp = (struct nlist *)stab->start;
ep = (struct nlist *)stab->end;
for (; sp < ep; sp++) {
if (sp->n_un.n_name == 0)
continue;
if ((sp->n_type & N_STAB) == 0 &&
sp->n_un.n_name != 0 &&
db_eqname(sp->n_un.n_name, symstr, '_'))
{
return ((db_sym_t)sp);
}
}
return ((db_sym_t)0);
}
db_sym_t
X_db_search_symbol(symtab, off, strategy, diffp)
db_symtab_t * symtab;
register
db_addr_t off;
db_strategy_t strategy;
db_expr_t *diffp; /* in/out */
{
register unsigned int diff = *diffp;
register struct nlist *symp = 0;
register struct nlist *sp, *ep;
sp = (struct nlist *)symtab->start;
ep = (struct nlist *)symtab->end;
for (; sp < ep; sp++) {
if (sp->n_un.n_name == 0)
continue;
if ((sp->n_type & N_STAB) != 0 || (sp->n_type & N_TYPE) == N_FN)
continue;
if (off >= sp->n_value) {
if (off - sp->n_value < diff) {
diff = off - sp->n_value;
symp = sp;
if (diff == 0 &&
(strategy == DB_STGY_PROC &&
sp->n_type == (N_TEXT|N_EXT) ||
strategy == DB_STGY_ANY &&
(sp->n_type & N_EXT)))
break;
}
else if (off - sp->n_value == diff) {
if (symp == 0)
symp = sp;
else if ((symp->n_type & N_EXT) == 0 &&
(sp->n_type & N_EXT) != 0)
symp = sp; /* pick the external symbol */
}
}
}
if (symp == 0) {
*diffp = off;
}
else {
*diffp = diff;
}
return ((db_sym_t)symp);
}
/*
* Return the name and value for a symbol.
*/
void
X_db_symbol_values(sym, namep, valuep)
db_sym_t sym;
char **namep;
db_expr_t *valuep;
{
register struct nlist *sp;
sp = (struct nlist *)sym;
if (namep)
*namep = sp->n_un.n_name;
if (valuep)
*valuep = sp->n_value;
}
boolean_t
X_db_line_at_pc(symtab, cursym, filename, linenum, off)
db_symtab_t * symtab;
db_sym_t cursym;
char **filename;
int *linenum;
db_expr_t off;
{
register struct nlist *sp, *ep;
register struct nlist *sym = (struct nlist *)cursym;
unsigned long sodiff = -1UL, lndiff = -1UL, ln = 0;
char *fname = NULL;
sp = (struct nlist *)symtab->start;
ep = (struct nlist *)symtab->end;
/* XXX - gcc specific */
#define NEWSRC(str) ((str) != NULL && \
(str)[0] == 'g' && strcmp((str), "gcc_compiled.") == 0)
for (; sp < ep; sp++) {
/*
* Prevent bogus linenumbers in case module not compiled
* with debugging options
*/
#if 0
if (sp->n_value <= off && (off - sp->n_value) <= sodiff &&
NEWSRC(sp->n_un.n_name)) {
#endif
if ((sp->n_type & N_TYPE) == N_FN || NEWSRC(sp->n_un.n_name)) {
sodiff = lndiff = -1UL;
ln = 0;
fname = NULL;
}
if (sp->n_type == N_SO) {
if (sp->n_value <= off && (off - sp->n_value) < sodiff) {
sodiff = off - sp->n_value;
fname = sp->n_un.n_name;
}
continue;
}
if (sp->n_type != N_SLINE)
continue;
if (sp->n_value > off)
break;
if (off - sp->n_value < lndiff) {
lndiff = off - sp->n_value;
ln = sp->n_desc;
}
}
if (fname != NULL && ln != 0) {
*filename = fname;
*linenum = ln;
return TRUE;
}
return (FALSE);
}
boolean_t
X_db_sym_numargs(symtab, cursym, nargp, argnamep)
db_symtab_t * symtab;
db_sym_t cursym;
int *nargp;
char **argnamep;
{
register struct nlist *sp, *ep;
u_long addr;
int maxnarg = *nargp, nargs = 0;
if (cursym == NULL)
return FALSE;
addr = ((struct nlist *)cursym)->n_value;
sp = (struct nlist *)symtab->start;
ep = (struct nlist *)symtab->end;
for (; sp < ep; sp++) {
if (sp->n_type == N_FUN && sp->n_value == addr) {
while (++sp < ep && sp->n_type == N_PSYM) {
if (nargs >= maxnarg)
break;
nargs++;
*argnamep++ = sp->n_un.n_name?sp->n_un.n_name:"???";
{
/* XXX - remove trailers */
char *cp = *(argnamep-1);
while (*cp != '\0' && *cp != ':') cp++;
if (*cp == ':') *cp = '\0';
}
}
*nargp = nargs;
return TRUE;
}
}
return FALSE;
}
/*
* Initialization routine for a.out files.
*/
ddb_init()
{
#ifndef SYMTAB_SPACE
extern char *esym;
extern int end;
if (esym > (char *)&end) {
X_db_sym_init((int *)&end, esym, "netbsd");
}
#else
X_db_sym_init (db_symtab, 0, "netbsd");
#endif
}
#endif /* DB_NO_AOUT */
|