1 /* $NetBSD: nlist_ecoff.c,v 1.11 2003/11/12 13:31:07 grant Exp $ */
2
3 /*
4 * Copyright (c) 1996 Christopher G. Demetriou
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 * must display the following acknowledgement:
17 * This product includes software developed for the
18 * NetBSD Project. See http://www.NetBSD.org/ for
19 * information about NetBSD.
20 * 4. The name of the author may not be used to endorse or promote products
21 * derived from this software without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
24 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
25 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
26 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
27 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
28 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
29 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
30 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
31 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
32 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33 *
34 * <<Id: LICENSE,v 1.2 2000/06/14 15:57:33 cgd Exp>>
35 */
36
37 #include <sys/cdefs.h>
38 #ifndef lint
39 __RCSID("$NetBSD: nlist_ecoff.c,v 1.11 2003/11/12 13:31:07 grant Exp $");
40 #endif /* not lint */
41
42 #include <sys/param.h>
43 #include <sys/mman.h>
44 #include <sys/stat.h>
45
46 #include <a.out.h>
47 #include <db.h>
48 #include <err.h>
49 #include <errno.h>
50 #include <fcntl.h>
51 #include <kvm.h>
52 #include <limits.h>
53 #include <stdio.h>
54 #include <stdlib.h>
55 #include <string.h>
56 #include <unistd.h>
57
58 #include "extern.h"
59
60 #ifdef NLIST_ECOFF
61 #include <sys/exec_ecoff.h>
62
63 typedef struct nlist NLIST;
64 #define _strx n_un.n_strx
65 #define _name n_un.n_name
66
67 #define badfmt(str) \
68 do { \
69 warnx("%s: %s: %s", kfile, str, strerror(EFTYPE)); \
70 punt(); \
71 } while (0)
72
73 #define check(off, size) ((off < 0) || (off + size > mappedsize))
74 #define BAD do { rv = -1; goto out; } while (0)
75 #define BADUNMAP do { rv = -1; goto unmap; } while (0)
76
77 static const char *kfile;
78
79 int
create_knlist_ecoff(name,db)80 create_knlist_ecoff(name, db)
81 const char *name;
82 DB *db;
83 {
84 struct ecoff_exechdr *exechdrp;
85 struct ecoff_symhdr *symhdrp;
86 struct ecoff_extsym *esyms;
87 struct stat st;
88 struct nlist nbuf;
89 DBT key, data;
90 char *mappedfile, *symname, *nsymname, *fsymname, *tmpcp;
91 size_t mappedsize, symnamesize, fsymnamesize;
92 u_long symhdroff, extrstroff;
93 u_long symhdrsize, i, nesyms;
94 int fd, rv;
95
96 rv = -1;
97
98 /*
99 * Open and map the whole file. If we can't open/stat it,
100 * something bad is going on so we punt.
101 */
102 kfile = name;
103 if ((fd = open(name, O_RDONLY, 0)) < 0) {
104 warn("%s", kfile);
105 punt();
106 }
107 if (fstat(fd, &st) < 0) {
108 warn("%s", kfile);
109 punt();
110 }
111 if (st.st_size > SIZE_T_MAX)
112 BAD;
113
114 /*
115 * Map the file in its entirety.
116 */
117 mappedsize = st.st_size;
118 mappedfile = mmap(NULL, mappedsize, PROT_READ, MAP_FILE|MAP_PRIVATE,
119 fd, 0);
120 if (mappedfile == (char *)-1)
121 BAD;
122
123 /*
124 * Make sure we can access the executable's header
125 * directly, and make sure the recognize the executable
126 * as an ECOFF binary.
127 */
128 if (check(0, sizeof *exechdrp))
129 BADUNMAP;
130 exechdrp = (struct ecoff_exechdr *)&mappedfile[0];
131
132 if (ECOFF_BADMAG(exechdrp))
133 BADUNMAP;
134
135 /*
136 * We've recognized it as an ECOFF binary. From here
137 * on out, all errors are fatal.
138 */
139
140 /*
141 * Find the symbol list and string table.
142 */
143 symhdroff = exechdrp->f.f_symptr;
144 symhdrsize = exechdrp->f.f_nsyms;
145
146 if (symhdrsize == 0)
147 badfmt("stripped");
148 if (check(symhdroff, sizeof *symhdrp) || sizeof *symhdrp != symhdrsize)
149 badfmt("bogus symbol table");
150 symhdrp = (struct ecoff_symhdr *)&mappedfile[symhdroff];
151
152 nesyms = symhdrp->esymMax;
153 if (check(symhdrp->cbExtOffset, nesyms * sizeof *esyms))
154 badfmt("bogus external symbol list");
155 esyms = (struct ecoff_extsym *)&mappedfile[symhdrp->cbExtOffset];
156 extrstroff = symhdrp->cbSsExtOffset;
157
158 /*
159 * Set up the data item, pointing to a nlist structure.
160 * which we fill in for each symbol.
161 */
162 data.data = (u_char *)&nbuf;
163 data.size = sizeof(nbuf);
164
165 /*
166 * Create a buffer (to be expanded later, if necessary)
167 * to hold symbol names after we've added underscores
168 * to them.
169 */
170 symnamesize = 1024;
171 if ((symname = malloc(symnamesize)) == NULL) {
172 warn("malloc");
173 punt();
174 }
175
176 /*
177 * Read each symbol and enter it into the database.
178 */
179 for (i = 0; i < nesyms; i++) {
180
181 /*
182 * Find symbol name, copy it (with added underscore) to
183 * temporary buffer, and prepare the database key for
184 * insertion.
185 */
186 fsymname = &mappedfile[extrstroff + esyms[i].es_strindex];
187 fsymnamesize = strlen(fsymname) + 1;
188 while (symnamesize < fsymnamesize + 1) {
189 if ((nsymname = realloc(symname, symnamesize * 2)) == NULL) {
190 warn("malloc");
191 punt();
192 }
193 symname = nsymname;
194 symnamesize *= 2;
195 }
196 strlcpy(symname, "_", symnamesize);
197 strlcat(symname, fsymname, symnamesize);
198
199 key.data = symname;
200 key.size = strlen((char *)key.data);
201
202 /*
203 * Convert the symbol information into an nlist structure,
204 * as best we can.
205 */
206 nbuf.n_value = esyms[i].es_value;
207 nbuf.n_type = N_EXT; /* XXX */
208 nbuf.n_desc = 0; /* XXX */
209 nbuf.n_other = 0; /* XXX */
210
211 /*
212 * Enter the symbol into the database.
213 */
214 if (db->put(db, &key, &data, 0)) {
215 warn("record enter");
216 punt();
217 }
218
219 /*
220 * If it's the kernel version string, we've gotta keep
221 * some extra data around. Under a separate key,
222 * we enter the first line (i.e. up to the first newline,
223 * with the newline replaced by a NUL to terminate the
224 * entered string) of the version string.
225 */
226 if (strcmp((char *)key.data, VRS_SYM) == 0) {
227 unsigned long vma;
228
229 key.data = (u_char *)VRS_KEY;
230 key.size = sizeof(VRS_KEY) - 1;
231
232 /* Find the version string, relative to start */
233 vma = nbuf.n_value;
234 if (exechdrp->a.text_start <= vma &&
235 vma < (exechdrp->a.text_start + exechdrp->a.tsize))
236 vma = vma - exechdrp->a.text_start +
237 ECOFF_TXTOFF(exechdrp);
238 else if (exechdrp->a.data_start <= vma &&
239 vma < (exechdrp->a.data_start + exechdrp->a.dsize))
240 vma = vma - exechdrp->a.data_start +
241 ECOFF_DATOFF(exechdrp);
242 else {
243 warn("version string neither text nor data");
244 punt();
245 }
246 data.data = strdup(&mappedfile[vma]);
247
248 /* assumes newline terminates version. */
249 if ((tmpcp = strchr(data.data, '\n')) != NULL)
250 *tmpcp = '\0';
251 data.size = strlen((char *)data.data);
252
253 if (db->put(db, &key, &data, 0)) {
254 warn("record enter");
255 punt();
256 }
257
258 /* free pointer created by strdup(). */
259 free(data.data);
260
261 /* Restore to original values */
262 data.data = (u_char *)&nbuf;
263 data.size = sizeof(nbuf);
264 }
265 }
266
267 rv = 0;
268
269 unmap:
270 munmap(mappedfile, mappedsize);
271 out:
272 return (rv);
273 }
274
275 #endif /* NLIST_ECOFF */
276