1 /* $NetBSD: nlist_ecoff.c,v 1.4 1997/07/13 19:46:07 christos 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 #if defined(LIBC_SCCS) && !defined(lint) 35 __RCSID("$NetBSD: nlist_ecoff.c,v 1.4 1997/07/13 19:46:07 christos Exp $"); 36 #endif /* LIBC_SCCS and not lint */ 37 38 #include <sys/param.h> 39 #include <sys/mman.h> 40 #include <sys/stat.h> 41 #include <sys/file.h> 42 43 #include <errno.h> 44 #include <stdio.h> 45 #include <string.h> 46 #include <unistd.h> 47 #include <a.out.h> /* for 'struct nlist' declaration */ 48 49 #include "nlist_private.h" 50 #ifdef NLIST_ECOFF 51 #include <sys/exec_ecoff.h> 52 #endif 53 54 #ifdef NLIST_ECOFF 55 #define check(off, size) ((off < 0) || (off + size > mappedsize)) 56 #define BAD do { rv = -1; goto out; } while (0) 57 #define BADUNMAP do { rv = -1; goto unmap; } while (0) 58 59 int 60 __fdnlist_ecoff(fd, list) 61 register int fd; 62 register struct nlist *list; 63 { 64 struct nlist *p; 65 struct ecoff_exechdr *exechdrp; 66 struct ecoff_symhdr *symhdrp; 67 struct ecoff_extsym *esyms; 68 struct stat st; 69 char *mappedfile; 70 size_t mappedsize; 71 u_long symhdroff, extstroff; 72 u_int symhdrsize; 73 int rv, nent; 74 long i, nesyms; 75 76 rv = -1; 77 78 /* 79 * If we can't fstat() the file, something bad is going on. 80 */ 81 if (fstat(fd, &st) < 0) 82 BAD; 83 84 /* 85 * Map the file in its entirety. 86 */ 87 if (st.st_size > SIZE_T_MAX) { 88 errno = EFBIG; 89 BAD; 90 } 91 mappedsize = st.st_size; 92 mappedfile = mmap(NULL, mappedsize, PROT_READ, 0, fd, 0); 93 if (mappedfile == (char *)-1) 94 BAD; 95 96 /* 97 * Make sure we can access the executable's header 98 * directly, and make sure the recognize the executable 99 * as an ECOFF binary. 100 */ 101 if (check(0, sizeof *exechdrp)) 102 BADUNMAP; 103 exechdrp = (struct ecoff_exechdr *)&mappedfile[0]; 104 105 if (ECOFF_BADMAG(exechdrp)) 106 BADUNMAP; 107 108 /* 109 * Find the symbol list. 110 */ 111 symhdroff = exechdrp->f.f_symptr; 112 symhdrsize = exechdrp->f.f_nsyms; 113 114 if (check(symhdroff, sizeof *symhdrp) || 115 sizeof *symhdrp != symhdrsize) 116 BADUNMAP; 117 symhdrp = (struct ecoff_symhdr *)&mappedfile[symhdroff]; 118 119 nesyms = symhdrp->esymMax; 120 if (check(symhdrp->cbExtOffset, nesyms * sizeof *esyms)) 121 BADUNMAP; 122 esyms = (struct ecoff_extsym *)&mappedfile[symhdrp->cbExtOffset]; 123 extstroff = symhdrp->cbSsExtOffset; 124 125 /* 126 * Clean out any left-over information for all valid entries. 127 * Type and value are defined to be 0 if not found; historical 128 * versions cleared other and desc as well. 129 * 130 * XXX Clearing anything other than n_type and n_value violates 131 * the semantics given in the man page. 132 */ 133 nent = 0; 134 for (p = list; !ISLAST(p); ++p) { 135 p->n_type = 0; 136 p->n_other = 0; 137 p->n_desc = 0; 138 p->n_value = 0; 139 ++nent; 140 } 141 142 for (i = 0; i < nesyms; i++) { 143 for (p = list; !ISLAST(p); p++) { 144 char *nlistname; 145 char *symtabname; 146 147 /* This may be incorrect */ 148 nlistname = p->n_un.n_name; 149 if (*nlistname == '_') 150 nlistname++; 151 152 symtabname = 153 &mappedfile[extstroff + esyms[i].es_strindex]; 154 155 if (!strcmp(symtabname, nlistname)) { 156 /* 157 * Translate (roughly) from ECOFF to nlist 158 */ 159 p->n_value = esyms[i].es_value; 160 p->n_type = N_EXT; /* XXX */ 161 p->n_desc = 0; /* XXX */ 162 p->n_other = 0; /* XXX */ 163 164 if (--nent <= 0) 165 goto done; 166 break; /* into next run of outer loop */ 167 } 168 } 169 } 170 171 done: 172 rv = nent; 173 unmap: 174 munmap(mappedfile, mappedsize); 175 out: 176 return (rv); 177 } 178 179 #endif /* NLIST_ECOFF */ 180