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
|
/* -*- linux-c -*-
* Symbolic Lookup Functions
* Copyright (C) 2005 Red Hat Inc.
* Copyright (C) 2006 Intel Corporation.
*
* This file is part of systemtap, and is free software. You can
* redistribute it and/or modify it under the terms of the GNU General
* Public License (GPL); either version 2, or (at your option) any
* later version.
*/
#ifndef _SYM_C_
#define _SYM_C_
#include "string.c"
/** @file sym.c
* @addtogroup sym Symbolic Functions
* Symbolic Lookup Functions
* @{
*/
static const char * _stp_kallsyms_lookup (
unsigned long addr,
unsigned long *symbolsize,
unsigned long *offset,
char **modname,
char *namebuf)
{
unsigned begin = 0;
unsigned end = stap_num_symbols;
/*const*/ struct stap_symbol* s;
/* binary search on index [begin,end) */
do {
unsigned mid = (begin + end) / 2;
if (addr < stap_symbols[mid].addr)
end = mid;
else
begin = mid;
} while (begin + 1 < end);
/* result index in $begin, guaranteed between [0,stap_num_symbols) */
s = & stap_symbols [begin];
if (addr < s->addr)
return NULL;
else {
if (offset) *offset = addr - s->addr;
if (modname) *modname = (char *) s->modname;
if (symbolsize) {
if ((begin + 1) < stap_num_symbols)
*symbolsize = stap_symbols[begin+1].addr - s->addr;
else
*symbolsize = 0;
// NB: This is only a heuristic. Sometimes there are large
// gaps between text areas of modules.
}
if (namebuf) {
strlcpy (namebuf, s->symbol, KSYM_NAME_LEN+1);
return namebuf;
}
else
return s->symbol;
}
}
/** Write addresses symbolically into a String
* @param str String
* @param address The address to lookup.
* @note Symbolic lookups should not normally be done within
* a probe because it is too time-consuming. Use at module exit time.
*/
String _stp_symbol_sprint (String str, unsigned long address)
{
char *modname;
const char *name;
unsigned long offset, size;
char namebuf[KSYM_NAME_LEN+1];
name = _stp_kallsyms_lookup(address, &size, &offset, &modname, namebuf);
_stp_sprintf (str, "0x%lx", address);
if (name) {
if (modname)
_stp_sprintf (str, " : %s+%#lx/%#lx [%s]", name, offset, size, modname);
else
_stp_sprintf (str, " : %s+%#lx/%#lx", name, offset, size);
}
return str;
}
/** Print addresses symbolically to the print buffer.
* @param address The address to lookup.
* @note Symbolic lookups should not normally be done within
* a probe because it is too time-consuming. Use at module exit time.
*/
#define _stp_symbol_print(address) _stp_symbol_sprint(_stp_stdout,address)
/** Write addresses symbolically into a char buffer
* @param str Destination buffer
* @param len Length of destination buffer
* @param address The address to lookup.
* @note Symbolic lookups should not normally be done within
* a probe because it is too time-consuming. Use at module exit time.
*/
const char *_stp_symbol_sprint_basic (char *str, size_t len, unsigned long address)
{
char *modname;
const char *name;
unsigned long offset, size;
char namebuf[KSYM_NAME_LEN+1];
if (len > KSYM_NAME_LEN) {
name = _stp_kallsyms_lookup(address, &size, &offset, &modname, str);
if (!name)
snprintf(str, len, "0x%lx", address);
} else {
name = _stp_kallsyms_lookup(address, &size, &offset, &modname, namebuf);
if (name)
strlcpy(str, namebuf, len);
else
snprintf(str, len, "0x%lx", address);
}
return str;
}
/** @} */
#endif /* _SYM_C_ */
|
