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
|
/* $NetBSD: nlist_ecoff.c,v 1.23 2012/03/20 00:31:24 matt Exp $ */
/*
* Copyright (c) 1996 Christopher G. Demetriou
* 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 for the
* NetBSD Project. See http://www.NetBSD.org/ for
* information about NetBSD.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*
* <<Id: LICENSE,v 1.2 2000/06/14 15:57:33 cgd Exp>>
*/
#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: nlist_ecoff.c,v 1.23 2012/03/20 00:31:24 matt Exp $");
#endif /* LIBC_SCCS and not lint */
#include "namespace.h"
#include <sys/param.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/file.h>
#include <assert.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <nlist.h>
#include "nlist_private.h"
#ifdef NLIST_ECOFF
#include <sys/exec_ecoff.h>
#endif
#ifdef NLIST_ECOFF
#define check(off, size) \
((size_t)off >= mappedsize || (size_t)(off + size) > mappedsize)
int
__fdnlist_ecoff(int fd, struct nlist *list)
{
struct nlist *p;
const struct ecoff_exechdr *exechdrp;
const struct ecoff_symhdr *symhdrp;
const struct ecoff_extsym *esyms;
struct stat st;
const char *mappedfile;
size_t mappedsize;
u_long symhdroff, extstroff;
u_int symhdrsize;
int rv, nent;
long i, nesyms;
_DIAGASSERT(fd != -1);
_DIAGASSERT(list != NULL);
rv = -1;
/*
* If we can't fstat() the file, something bad is going on.
*/
if (fstat(fd, &st) < 0)
goto out;
/*
* Map the file in its entirety.
*/
if ((uintmax_t)st.st_size > (uintmax_t)SIZE_T_MAX) {
errno = EFBIG;
goto out;
}
mappedsize = (size_t)st.st_size;
mappedfile = mmap(NULL, mappedsize, PROT_READ, MAP_PRIVATE|MAP_FILE,
fd, 0);
if (mappedfile == MAP_FAILED)
goto out;
/*
* Make sure we can access the executable's header
* directly, and make sure the recognize the executable
* as an ECOFF binary.
*/
if (check(0, sizeof *exechdrp))
goto unmap;
exechdrp = (const void *)mappedfile;
if (ECOFF_BADMAG(exechdrp))
goto unmap;
/*
* Find the symbol list.
*/
symhdroff = exechdrp->f.f_symptr;
symhdrsize = exechdrp->f.f_nsyms;
if ((symhdroff + sizeof *symhdrp) > mappedsize ||
sizeof *symhdrp != symhdrsize)
goto unmap;
symhdrp = (const void *)&mappedfile[symhdroff];
nesyms = symhdrp->esymMax;
if (check(symhdrp->cbExtOffset, nesyms * sizeof *esyms))
goto unmap;
esyms = (const void *)&mappedfile[symhdrp->cbExtOffset];
extstroff = symhdrp->cbSsExtOffset;
/*
* Clean out any left-over information for all valid entries.
* Type and value are defined to be 0 if not found; historical
* versions cleared other and desc as well.
*
* XXX Clearing anything other than n_type and n_value violates
* the semantics given in the man page.
*/
nent = 0;
for (p = list; !ISLAST(p); ++p) {
p->n_type = 0;
p->n_other = 0;
p->n_desc = 0;
p->n_value = 0;
++nent;
}
for (i = 0; i < nesyms; i++) {
for (p = list; !ISLAST(p); p++) {
const char *nlistname;
const char *symtabname;
/* This may be incorrect */
nlistname = N_NAME(p);
if (*nlistname == '_')
nlistname++;
symtabname =
&mappedfile[extstroff + esyms[i].es_strindex];
if (!strcmp(symtabname, nlistname)) {
/*
* Translate (roughly) from ECOFF to nlist
*/
p->n_value = esyms[i].es_value;
p->n_type = N_EXT; /* XXX */
p->n_desc = 0; /* XXX */
p->n_other = 0; /* XXX */
if (--nent <= 0)
goto done;
break; /* into next run of outer loop */
}
}
}
done:
rv = nent;
unmap:
munmap(__UNCONST(mappedfile), mappedsize);
out:
return rv;
}
#endif /* NLIST_ECOFF */
|
