1 /* $NetBSD: nlist_ecoff.c,v 1.20 2012/03/19 16:20:58 christos 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 #if defined(LIBC_SCCS) && !defined(lint) 39 __RCSID("$NetBSD: nlist_ecoff.c,v 1.20 2012/03/19 16:20:58 christos Exp $"); 40 #endif /* LIBC_SCCS and not lint */ 41 42 #include "namespace.h" 43 #include <sys/param.h> 44 #include <sys/mman.h> 45 #include <sys/stat.h> 46 #include <sys/file.h> 47 48 #include <assert.h> 49 #include <errno.h> 50 #include <stdio.h> 51 #include <string.h> 52 #include <unistd.h> 53 #include <nlist.h> 54 55 #include "nlist_private.h" 56 #ifdef NLIST_ECOFF 57 #include <sys/exec_ecoff.h> 58 #endif 59 60 #ifdef NLIST_ECOFF 61 #define check(off, size) ((off < 0) || (off + size > mappedsize)) 62 63 int 64 __fdnlist_ecoff(fd, list) 65 int fd; 66 struct nlist *list; 67 { 68 struct nlist *p; 69 struct ecoff_exechdr *exechdrp; 70 struct ecoff_symhdr *symhdrp; 71 struct ecoff_extsym *esyms; 72 struct stat st; 73 void *mappedfile; 74 size_t mappedsize; 75 u_long symhdroff, extstroff; 76 u_int symhdrsize; 77 int rv, nent; 78 long i, nesyms; 79 80 _DIAGASSERT(fd != -1); 81 _DIAGASSERT(list != NULL); 82 83 rv = -1; 84 85 /* 86 * If we can't fstat() the file, something bad is going on. 87 */ 88 if (fstat(fd, &st) < 0) 89 goto out; 90 91 /* 92 * Map the file in its entirety. 93 */ 94 if ((uintmax_t)st.st_size > (uintmax_t)SIZE_T_MAX) { 95 errno = EFBIG; 96 goto out; 97 } 98 mappedsize = (size_t)st.st_size; 99 mappedfile = mmap(NULL, mappedsize, PROT_READ, MAP_PRIVATE|MAP_FILE, 100 fd, 0); 101 if (mappedfile == MAP_FAILED) 102 goto out; 103 104 /* 105 * Make sure we can access the executable's header 106 * directly, and make sure the recognize the executable 107 * as an ECOFF binary. 108 */ 109 if (check(0, sizeof *exechdrp)) 110 goto unmap; 111 exechdrp = mappedfile; 112 113 if (ECOFF_BADMAG(exechdrp)) 114 goto unmap; 115 116 /* 117 * Find the symbol list. 118 */ 119 symhdroff = exechdrp->f.f_symptr; 120 symhdrsize = exechdrp->f.f_nsyms; 121 122 if ((symhdroff + sizeof *symhdrp) > mappedsize || 123 sizeof *symhdrp != symhdrsize) 124 goto unmap; 125 symhdrp = (void *)((char *)mappedfile + symhdroff); 126 127 nesyms = symhdrp->esymMax; 128 if (check(symhdrp->cbExtOffset, nesyms * sizeof *esyms)) 129 goto unmap; 130 esyms = (void *)((char *)mappedfile + symhdrp->cbExtOffset); 131 extstroff = symhdrp->cbSsExtOffset; 132 133 /* 134 * Clean out any left-over information for all valid entries. 135 * Type and value are defined to be 0 if not found; historical 136 * versions cleared other and desc as well. 137 * 138 * XXX Clearing anything other than n_type and n_value violates 139 * the semantics given in the man page. 140 */ 141 nent = 0; 142 for (p = list; !ISLAST(p); ++p) { 143 p->n_type = 0; 144 p->n_other = 0; 145 p->n_desc = 0; 146 p->n_value = 0; 147 ++nent; 148 } 149 150 for (i = 0; i < nesyms; i++) { 151 for (p = list; !ISLAST(p); p++) { 152 const char *nlistname; 153 char *symtabname; 154 155 /* This may be incorrect */ 156 nlistname = N_NAME(p); 157 if (*nlistname == '_') 158 nlistname++; 159 160 symtabname = (void *)((char *) 161 mappedfile + (extstroff + esyms[i].es_strindex)); 162 163 if (!strcmp(symtabname, nlistname)) { 164 /* 165 * Translate (roughly) from ECOFF to nlist 166 */ 167 p->n_value = esyms[i].es_value; 168 p->n_type = N_EXT; /* XXX */ 169 p->n_desc = 0; /* XXX */ 170 p->n_other = 0; /* XXX */ 171 172 if (--nent <= 0) 173 goto done; 174 break; /* into next run of outer loop */ 175 } 176 } 177 } 178 179 done: 180 rv = nent; 181 unmap: 182 munmap(mappedfile, mappedsize); 183 out: 184 return rv; 185 } 186 187 #endif /* NLIST_ECOFF */ 188