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
|
/*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that: (1) source code
* distributions retain the above copyright notice and this paragraph
* in its entirety, and (2) distributions including binary code include
* the above copyright notice and this paragraph in its entirety in
* the documentation or other materials provided with the distribution.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND
* WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT
* LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE.
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <bfd.h>
/*
* Generate instrumentation calls for entry and exit to functions.
* Just after function entry and just before function exit, the
* following profiling functions are called with the address of the
* current function and its call site (currently not use).
*
* The attribute 'no_instrument_function' causes this instrumentation is
* not done.
*
* These profiling functions call print_debug(). This function prints the
* current function name with indentation and call level.
* If entering in a function it prints also the calling function name with
* file name and line number.
*
* If the environment variable INSTRUMENT is
* unset or set to an empty string, print nothing, like with no instrumentation
* set to "all" or "a", print all the functions names
* set to "global" or "g", print only the global functions names
*/
#define ND_NO_INSTRUMENT __attribute__((no_instrument_function))
/* Store the function call level, used also in pretty_print_packet() */
extern int profile_func_level;
int profile_func_level = -1;
typedef enum {
ENTER,
EXIT
} action_type;
void __cyg_profile_func_enter(void *this_fn, void *call_site) ND_NO_INSTRUMENT;
void __cyg_profile_func_exit(void *this_fn, void *call_site) ND_NO_INSTRUMENT;
static void print_debug(void *this_fn, void *call_site, action_type action)
ND_NO_INSTRUMENT;
void
__cyg_profile_func_enter(void *this_fn, void *call_site)
{
print_debug(this_fn, call_site, ENTER);
}
void
__cyg_profile_func_exit(void *this_fn, void *call_site)
{
print_debug(this_fn, call_site, EXIT);
}
static void print_debug(void *this_fn, void *call_site, action_type action)
{
static bfd* abfd;
static asymbol **symtab;
static long symcount;
static asection *text;
static bfd_vma vma;
static int instrument_set;
static int instrument_off;
static int instrument_global;
if (!instrument_set) {
static char *instrument_type;
/* Get the configuration environment variable INSTRUMENT value if any */
instrument_type = getenv("INSTRUMENT");
/* unset or set to an empty string ? */
if (instrument_type == NULL ||
!strncmp(instrument_type, "", sizeof(""))) {
instrument_off = 1;
} else {
/* set to "global" or "g" ? */
if (!strncmp(instrument_type, "global", sizeof("global")) ||
!strncmp(instrument_type, "g", sizeof("g")))
instrument_global = 1;
else if (strncmp(instrument_type, "all", sizeof("all")) &&
strncmp(instrument_type, "a", sizeof("a"))) {
fprintf(stderr, "INSTRUMENT can be only \"\", \"all\", \"a\", "
"\"global\" or \"g\".\n");
exit(1);
}
}
instrument_set = 1;
}
if (instrument_off)
return;
/* If no errors, this block should be executed one time */
if (!abfd) {
char pgm_name[1024];
long symsize;
ssize_t ret = readlink("/proc/self/exe", pgm_name, sizeof(pgm_name));
if (ret == -1) {
perror("failed to find executable");
return;
}
if (ret == sizeof(pgm_name)) {
/* no space for the '\0' */
printf("truncation may have occurred\n");
return;
}
pgm_name[ret] = '\0';
bfd_init();
abfd = bfd_openr(pgm_name, NULL);
if (!abfd) {
bfd_perror("bfd_openr");
return;
}
if (!bfd_check_format(abfd, bfd_object)) {
bfd_perror("bfd_check_format");
return;
}
if((symsize = bfd_get_symtab_upper_bound(abfd)) == -1) {
bfd_perror("bfd_get_symtab_upper_bound");
return;
}
symtab = (asymbol **)malloc((size_t)symsize);
symcount = bfd_canonicalize_symtab(abfd, symtab);
if (symcount < 0) {
free(symtab);
bfd_perror("bfd_canonicalize_symtab");
return;
}
if ((text = bfd_get_section_by_name(abfd, ".text")) == NULL) {
bfd_perror("bfd_get_section_by_name");
return;
}
vma = text->vma;
}
if (instrument_global) {
symbol_info syminfo;
int found;
long i;
i = 0;
found = 0;
while (i < symcount && !found) {
bfd_get_symbol_info(abfd, symtab[i], &syminfo);
if ((void *)syminfo.value == this_fn) {
found = 1;
}
i++;
}
/* type == 'T' for a global function */
if (found == 1 && syminfo.type != 'T')
return;
}
/* Current function */
if ((bfd_vma)this_fn < vma) {
printf("[ERROR address this_fn]");
} else {
const char *file;
const char *func;
unsigned int line;
if (!bfd_find_nearest_line(abfd, text, symtab, (bfd_vma)this_fn - vma,
&file, &func, &line)) {
printf("[ERROR bfd_find_nearest_line this_fn]");
} else {
int i;
if (action == ENTER)
profile_func_level += 1;
/* Indentation */
for (i = 0 ; i < profile_func_level ; i++)
putchar(' ');
if (action == ENTER)
printf("[>> ");
else
printf("[<< ");
/* Function name */
if (func == NULL || *func == '\0')
printf("???");
else
printf("%s", func);
printf(" (%d)", profile_func_level);
/* Print the "from" part except for the main function) */
if (action == ENTER && func != NULL &&
strncmp(func, "main", sizeof("main"))) {
/* Calling function */
if ((bfd_vma)call_site < vma) {
printf("[ERROR address call_site]");
} else {
if (!bfd_find_nearest_line(abfd, text, symtab,
(bfd_vma)call_site - vma, &file,
&func, &line)) {
printf("[ERROR bfd_find_nearest_line call_site]");
} else {
printf(" from ");
/* Function name */
if (func == NULL || *func == '\0')
printf("???");
else
printf("%s", func);
/* File name */
if (file == NULL || *file == '\0')
printf(" ??:");
else {
char *slashp = strrchr(file, '/');
if (slashp != NULL)
file = slashp + 1;
printf(" %s:", file);
}
/* Line number */
if (line == 0)
printf("?");
else
printf("%u", line);
printf("]");
}
}
}
putchar('\n');
if (action == EXIT)
profile_func_level -= 1;
}
}
fflush(stdout);
}
/* vi: set tabstop=4 softtabstop=0 shiftwidth=4 smarttab autoindent : */
|
