nlist_ecoff.c revision 1.6
1 /* $NetBSD: nlist_ecoff.c,v 1.6 2000/06/14 06:49:25 cgd Exp $ */ 2 3 /* 4 * Copyright (c) 1996 Christopher G. Demetriou. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by Christopher G. Demetriou 17 * for the NetBSD Project. 18 * 4. The name of the author may not be used to endorse or promote products 19 * derived from this software without specific prior written permission 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 #include <sys/cdefs.h> 34 #ifndef lint 35 __RCSID("$NetBSD: nlist_ecoff.c,v 1.6 2000/06/14 06:49:25 cgd Exp $"); 36 #endif /* not lint */ 37 38 #include <sys/param.h> 39 #include <sys/mman.h> 40 #include <sys/stat.h> 41 42 #include <a.out.h> 43 #include <db.h> 44 #include <err.h> 45 #include <errno.h> 46 #include <fcntl.h> 47 #include <kvm.h> 48 #include <limits.h> 49 #include <stdio.h> 50 #include <stdlib.h> 51 #include <string.h> 52 #include <unistd.h> 53 54 #include "extern.h" 55 56 #ifdef NLIST_ECOFF 57 #include <sys/exec_ecoff.h> 58 59 typedef struct nlist NLIST; 60 #define _strx n_un.n_strx 61 #define _name n_un.n_name 62 63 #define badfmt(str) \ 64 do { \ 65 warnx("%s: %s: %s", kfile, str, strerror(EFTYPE)); \ 66 punt(); \ 67 } while (0) 68 69 #define check(off, size) ((off < 0) || (off + size > mappedsize)) 70 #define BAD do { rv = -1; goto out; } while (0) 71 #define BADUNMAP do { rv = -1; goto unmap; } while (0) 72 73 static const char *kfile; 74 75 int 76 create_knlist_ecoff(name, db) 77 const char *name; 78 DB *db; 79 { 80 struct ecoff_exechdr *exechdrp; 81 struct ecoff_symhdr *symhdrp; 82 struct ecoff_extsym *esyms; 83 struct stat st; 84 struct nlist nbuf; 85 DBT key, data; 86 char *mappedfile, *symname, *fsymname, *tmpcp; 87 size_t mappedsize, symnamesize, fsymnamesize; 88 u_long symhdroff, extrstroff; 89 u_long symhdrsize, i, nesyms; 90 int fd, rv; 91 92 rv = -1; 93 94 /* 95 * Open and map the whole file. If we can't open/stat it, 96 * something bad is going on so we punt. 97 */ 98 kfile = name; 99 if ((fd = open(name, O_RDONLY, 0)) < 0) { 100 warn("%s", kfile); 101 punt(); 102 } 103 if (fstat(fd, &st) < 0) { 104 warn("%s", kfile); 105 punt(); 106 } 107 if (st.st_size > SIZE_T_MAX) 108 BAD; 109 110 /* 111 * Map the file in its entirety. 112 */ 113 mappedsize = st.st_size; 114 mappedfile = mmap(NULL, mappedsize, PROT_READ, MAP_FILE|MAP_PRIVATE, 115 fd, 0); 116 if (mappedfile == (char *)-1) 117 BAD; 118 119 /* 120 * Make sure we can access the executable's header 121 * directly, and make sure the recognize the executable 122 * as an ECOFF binary. 123 */ 124 if (check(0, sizeof *exechdrp)) 125 BADUNMAP; 126 exechdrp = (struct ecoff_exechdr *)&mappedfile[0]; 127 128 if (ECOFF_BADMAG(exechdrp)) 129 BADUNMAP; 130 131 /* 132 * We've recognized it as an ECOFF binary. From here 133 * on out, all errors are fatal. 134 */ 135 136 /* 137 * Find the symbol list and string table. 138 */ 139 symhdroff = exechdrp->f.f_symptr; 140 symhdrsize = exechdrp->f.f_nsyms; 141 142 if (symhdrsize == 0) 143 badfmt("stripped"); 144 if (check(symhdroff, sizeof *symhdrp) || sizeof *symhdrp != symhdrsize) 145 badfmt("bogus symbol table"); 146 symhdrp = (struct ecoff_symhdr *)&mappedfile[symhdroff]; 147 148 nesyms = symhdrp->esymMax; 149 if (check(symhdrp->cbExtOffset, nesyms * sizeof *esyms)) 150 badfmt("bogus external symbol list"); 151 esyms = (struct ecoff_extsym *)&mappedfile[symhdrp->cbExtOffset]; 152 extrstroff = symhdrp->cbSsExtOffset; 153 154 /* 155 * Set up the data item, pointing to a nlist structure. 156 * which we fill in for each symbol. 157 */ 158 data.data = (u_char *)&nbuf; 159 data.size = sizeof(nbuf); 160 161 /* 162 * Create a buffer (to be expanded later, if necessary) 163 * to hold symbol names after we've added underscores 164 * to them. 165 */ 166 symnamesize = 1024; 167 if ((symname = malloc(symnamesize)) == NULL) { 168 warn("malloc"); 169 punt(); 170 } 171 172 /* 173 * Read each symbol and enter it into the database. 174 */ 175 for (i = 0; i < nesyms; i++) { 176 177 /* 178 * Find symbol name, copy it (with added underscore) to 179 * temporary buffer, and prepare the database key for 180 * insertion. 181 */ 182 fsymname = &mappedfile[extrstroff + esyms[i].es_strindex]; 183 fsymnamesize = strlen(fsymname) + 1; 184 while (symnamesize < fsymnamesize + 1) { 185 symnamesize *= 2; 186 if ((symname = realloc(symname, symnamesize)) == NULL) { 187 warn("malloc"); 188 punt(); 189 } 190 } 191 strcpy(symname, "_"); 192 strcat(symname, fsymname); 193 194 key.data = symname; 195 key.size = strlen((char *)key.data); 196 197 /* 198 * Convert the symbol information into an nlist structure, 199 * as best we can. 200 */ 201 nbuf.n_value = esyms[i].es_value; 202 nbuf.n_type = N_EXT; /* XXX */ 203 nbuf.n_desc = 0; /* XXX */ 204 nbuf.n_other = 0; /* XXX */ 205 206 /* 207 * Enter the symbol into the database. 208 */ 209 if (db->put(db, &key, &data, 0)) { 210 warn("record enter"); 211 punt(); 212 } 213 214 /* 215 * If it's the kernel version string, we've gotta keep 216 * some extra data around. Under a seperate key, 217 * we enter the first line (i.e. up to the first newline, 218 * with the newline replaced by a NUL to terminate the 219 * entered string) of the version string. 220 */ 221 if (strcmp((char *)key.data, VRS_SYM) == 0) { 222 unsigned long vma; 223 224 key.data = (u_char *)VRS_KEY; 225 key.size = sizeof(VRS_KEY) - 1; 226 227 /* Find the version string, relative to start */ 228 vma = nbuf.n_value; 229 if (exechdrp->a.text_start <= vma && 230 vma < (exechdrp->a.text_start + exechdrp->a.tsize)) 231 vma = vma - exechdrp->a.text_start + 232 ECOFF_TXTOFF(exechdrp); 233 else if (exechdrp->a.data_start <= vma && 234 vma < (exechdrp->a.data_start + exechdrp->a.dsize)) 235 vma = vma - exechdrp->a.data_start + 236 ECOFF_DATOFF(exechdrp); 237 else { 238 warn("version string neither text nor data"); 239 punt(); 240 } 241 data.data = strdup(&mappedfile[vma]); 242 243 /* assumes newline terminates version. */ 244 if ((tmpcp = strchr(data.data, '\n')) != NULL) 245 *tmpcp = '\0'; 246 data.size = strlen((char *)data.data); 247 248 if (db->put(db, &key, &data, 0)) { 249 warn("record enter"); 250 punt(); 251 } 252 253 /* free pointer created by strdup(). */ 254 free(data.data); 255 256 /* Restore to original values */ 257 data.data = (u_char *)&nbuf; 258 data.size = sizeof(nbuf); 259 } 260 } 261 262 rv = 0; 263 264 unmap: 265 munmap(mappedfile, mappedsize); 266 out: 267 return (rv); 268 } 269 270 #endif /* NLIST_ECOFF */ 271
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