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
|
/*-
* Copyright (c) 1983, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/types.h>
#include <a.out.h>
#include "gprof.h"
static void getstrtab(FILE *, const char *);
static void getsymtab(FILE *, const char *);
static void gettextspace(FILE *);
static bool funcsymbol(struct nlist *);
static char *strtab; /* string table in core */
static long ssiz; /* size of the string table */
static struct exec xbuf; /* exec header of a.out */
/* Things which get -E excluded by default. */
static char *excludes[] = { "mcount", "__mcleanup", NULL };
/*
* Set up string and symbol tables from a.out.
* and optionally the text space.
* On return symbol table is sorted by value.
*
* Returns 0 on success, -1 on failure.
*/
int
getnfile(const char *filename, char ***defaultEs)
{
FILE *nfile;
nfile = fopen( filename ,"r");
if (nfile == NULL)
err(1, "fopen: %s", filename);
fread(&xbuf, 1, sizeof(xbuf), nfile);
if (N_BADMAG(xbuf)) {
/* Bail out and let other binary formats try. */
fclose(nfile);
return (-1);
}
getstrtab(nfile, filename);
getsymtab(nfile, filename);
gettextspace(nfile);
fclose(nfile);
#ifdef DEBUG
if (debug & AOUTDEBUG) {
int j;
for (j = 0; j < nname; j++) {
printf("[getnfile] 0X%08lx\t%s\n", nl[j].value,
nl[j].name);
}
}
#endif
*defaultEs = excludes;
return (0);
}
static void
getstrtab(FILE *nfile, const char *filename)
{
fseek(nfile, (long)(N_SYMOFF(xbuf) + xbuf.a_syms), 0);
if (fread(&ssiz, sizeof (ssiz), 1, nfile) == 0)
errx(1, "%s: no string table (old format?)" , filename );
strtab = calloc(ssiz, 1);
if (strtab == NULL)
errx(1, "%s: no room for %d bytes of string table", filename,
ssiz);
if (fread(strtab + sizeof(ssiz), ssiz - sizeof(ssiz), 1, nfile) != 1)
errx(1, "%s: error reading string table", filename );
}
/*
* Read in symbol table
*/
static void
getsymtab(FILE *nfile, const char *filename)
{
struct nlist nbuf;
int askfor;
long i;
/* pass1 - count symbols */
fseek(nfile, (long)N_SYMOFF(xbuf), 0);
nname = 0;
for (i = xbuf.a_syms; i > 0; i -= sizeof(struct nlist)) {
fread(&nbuf, sizeof(nbuf), 1, nfile);
if (funcsymbol(&nbuf))
nname++;
}
if (nname == 0)
errx(1, "%s: no symbols", filename);
askfor = nname + 1;
nl = calloc(askfor , sizeof(nltype));
if (nl == 0)
errx(1, "No room for %d bytes of symbol table",
askfor * sizeof(nltype));
/* pass2 - read symbols */
fseek(nfile, (long)N_SYMOFF(xbuf), 0);
npe = nl;
nname = 0;
for (i = xbuf.a_syms; i > 0; i -= sizeof(struct nlist)) {
fread(&nbuf, sizeof(nbuf), 1, nfile);
if (!funcsymbol(&nbuf)) {
#ifdef DEBUG
if (debug & AOUTDEBUG) {
printf("[getsymtab] rejecting: 0x%x %s\n",
nbuf.n_type, strtab + nbuf.n_un.n_strx);
}
#endif
continue;
}
npe->value = nbuf.n_value;
npe->name = strtab + nbuf.n_un.n_strx;
#ifdef DEBUG
if (debug & AOUTDEBUG) {
printf("[getsymtab] %d %s 0x%08lx\n",
nname, npe->name, npe->value);
}
#endif
npe++;
nname++;
}
npe->value = -1;
}
/*
* read in the text space of an a.out file
*/
static void
gettextspace(FILE *nfile)
{
if (cflag == 0)
return;
textspace = malloc(xbuf.a_text);
if (textspace == 0) {
warnx("ran out room for %d bytes of text space: can't do -c" ,
xbuf.a_text);
return;
}
(void)fseek(nfile, N_TXTOFF(xbuf), 0);
if (fread(textspace, 1, xbuf.a_text, nfile) != xbuf.a_text ) {
warnx("couldn't read text space: can't do -c");
free(textspace);
textspace = 0;
return;
}
}
static bool
funcsymbol(struct nlist *nlistp)
{
char *name, c;
/*
* must be a text symbol,
* and static text symbols don't qualify if aflag set.
*/
if (!((nlistp->n_type == (N_TEXT|N_EXT))
|| ((nlistp->n_type == N_TEXT) && (aflag == 0))))
return FALSE;
/*
* name must start with an underscore if uflag is set.
* can't have any `funny' characters in name,
* where `funny' means `.' (.o file names)
* need to make an exception for sparc .mul & co.
* perhaps we should just drop this code entirely...
*/
name = strtab + nlistp -> n_un.n_strx;
#ifdef sparc
if (nlistp -> n_value & 3)
return (FALSE);
if (*name == '.') {
char *p = name + 1;
if (*p == 'u')
p++;
if (strcmp(p, "mul") == 0 || strcmp(p, "div") == 0 ||
strcmp(p, "rem") == 0 )
return (TRUE);
}
#endif
while (c = *name++) {
if (c == '.') {
return (FALSE);
}
}
return (TRUE);
}
|
