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
|
/* $OpenBSD: db_sym.c,v 1.53 2017/05/30 15:39:05 mpi Exp $ */
/* $NetBSD: db_sym.c,v 1.24 2000/08/11 22:50:47 tv Exp $ */
/*
* Mach Operating System
* Copyright (c) 1993,1992,1991,1990 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 "AS IS"
* 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 Mellon
* the rights to redistribute these changes.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <machine/db_machdep.h>
#include <ddb/db_lex.h>
#include <ddb/db_sym.h>
#include <ddb/db_output.h>
#include <ddb/db_command.h>
extern char end[];
/*
* Initialize the kernel debugger by initializing the master symbol
* table. Note that if initializing the master symbol table fails,
* no other symbol tables can be loaded.
*/
void
ddb_init(void)
{
const char *name = "bsd";
extern char *esym;
#if defined(__sparc64__) || defined(__mips__) || defined(__amd64__) || \
defined(__i386__)
extern char *ssym;
#endif
char *xssym, *xesym;
xesym = esym;
#if defined(__sparc64__) || defined(__mips__) || defined(__amd64__) || \
defined(__i386__)
xssym = ssym;
#else
xssym = (char *)&end;
#endif
/*
* Do this check now for the master symbol table to avoid printing
* the message N times.
*/
if ((((vaddr_t)xssym) & (sizeof(long) - 1)) != 0) {
printf("[ %s symbol table has bad start address %p ]\n",
name, xssym);
return;
}
if (xesym != NULL && xesym != xssym) {
if (db_elf_sym_init((vaddr_t)xesym - (vaddr_t)xssym, xssym,
xesym, name) == 1)
return;
}
printf("[ no symbol table formats found ]\n");
}
int
db_eqname(char *src, char *dst, int c)
{
if (!strcmp(src, dst))
return (1);
if (src[0] == c)
return (!strcmp(src+1,dst));
return (0);
}
/*
* Find the closest symbol to val, and return its name
* and the difference between val and the symbol found.
*/
Elf_Sym *
db_search_symbol(db_addr_t val, db_strategy_t strategy, db_expr_t *offp)
{
unsigned int diff;
db_expr_t newdiff;
Elf_Sym *ret = NULL, *sym;
newdiff = diff = ~0;
sym = db_elf_sym_search(val, strategy, &newdiff);
if (newdiff < diff) {
diff = newdiff;
ret = sym;
}
*offp = diff;
return ret;
}
/*
* Print a the closest symbol to value
*
* After matching the symbol according to the given strategy
* we print it in the name+offset format, provided the symbol's
* value is close enough (eg smaller than db_maxoff).
* We also attempt to print [filename:linenum] when applicable
* (eg for procedure names).
*
* If we could not find a reasonable name+offset representation,
* then we just print the value in hex. Small values might get
* bogus symbol associations, e.g. 3 might get some absolute
* value like _INCLUDE_VERSION or something, therefore we do
* not accept symbols whose value is zero (and use plain hex).
* Also, avoid printing as "end+0x????" which is useless.
* The variable db_lastsym is used instead of "end" in case we
* add support for symbols in loadable driver modules.
*/
unsigned long db_lastsym = (unsigned long)end;
unsigned int db_maxoff = 0x10000000;
void
db_printsym(db_expr_t off, db_strategy_t strategy,
int (*pr)(const char *, ...))
{
db_expr_t d;
char *filename;
char *name;
db_expr_t value;
int linenum;
Elf_Sym *cursym;
char buf[DB_FORMAT_BUF_SIZE];
if (off <= db_lastsym) {
cursym = db_search_symbol(off, strategy, &d);
db_symbol_values(cursym, &name, &value);
if (name && (d < db_maxoff) && value) {
(*pr)("%s", name);
if (d) {
(*pr)("+%s", db_format(buf, sizeof(buf),
d, DB_FORMAT_R, 1, 0));
}
if (strategy == DB_STGY_PROC) {
if (db_elf_line_at_pc(cursym, &filename,
&linenum, off))
(*pr)(" [%s:%d]", filename, linenum);
}
return;
}
}
(*pr)("%s", db_format(buf, sizeof(buf), off, DB_FORMAT_N, 1, 0));
return;
}
|
