1 /* $NetBSD: nlist_aout.c,v 1.14 2003/04/20 21:08:11 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1996 Christopher G. Demetriou. All rights reserved. 5 * Copyright (c) 1989, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37 #include <sys/cdefs.h> 38 #if defined(LIBC_SCCS) && !defined(lint) 39 #if 0 40 static char sccsid[] = "@(#)nlist.c 8.1 (Berkeley) 6/4/93"; 41 #else 42 __RCSID("$NetBSD: nlist_aout.c,v 1.14 2003/04/20 21:08:11 christos Exp $"); 43 #endif 44 #endif /* LIBC_SCCS and not lint */ 45 46 #include "namespace.h" 47 #include <sys/param.h> 48 #include <sys/mman.h> 49 #include <sys/stat.h> 50 #include <sys/file.h> 51 52 #include <assert.h> 53 #include <errno.h> 54 #include <stdio.h> 55 #include <string.h> 56 #include <unistd.h> 57 #include <stdlib.h> 58 #include <a.out.h> /* for 'struct nlist' declaration */ 59 60 #include "nlist_private.h" 61 62 #ifdef NLIST_AOUT 63 int 64 __fdnlist_aout(fd, list) 65 int fd; 66 struct nlist *list; 67 { 68 struct nlist *p, *s; 69 char *strtab; 70 off_t stroff, symoff; 71 int nent; 72 size_t strsize, symsize, cc; 73 struct nlist nbuf[1024]; 74 struct exec exec; 75 struct stat st; 76 char *scoreboard, *scored; 77 78 _DIAGASSERT(fd != -1); 79 _DIAGASSERT(list != NULL); 80 81 if (pread(fd, &exec, sizeof(exec), (off_t)0) != sizeof(exec) || 82 N_BADMAG(exec) || fstat(fd, &st) < 0) 83 return (-1); 84 85 symoff = N_SYMOFF(exec); 86 symsize = (size_t)exec.a_syms; 87 stroff = symoff + symsize; 88 89 /* Check for files too large to mmap. */ 90 if (st.st_size - stroff > SIZE_T_MAX) { 91 errno = EFBIG; 92 return (-1); 93 } 94 /* 95 * Map string table into our address space. This gives us 96 * an easy way to randomly access all the strings, without 97 * making the memory allocation permanent as with malloc/free 98 * (i.e., munmap will return it to the system). 99 */ 100 strsize = (size_t)(st.st_size - stroff); 101 strtab = mmap(NULL, strsize, PROT_READ, MAP_PRIVATE|MAP_FILE, 102 fd, stroff); 103 if (strtab == (char *)-1) 104 return (-1); 105 /* 106 * clean out any left-over information for all valid entries. 107 * Type and value defined to be 0 if not found; historical 108 * versions cleared other and desc as well. Also figure out 109 * the largest string length so don't read any more of the 110 * string table than we have to. 111 * 112 * XXX clearing anything other than n_type and n_value violates 113 * the semantics given in the man page. 114 */ 115 nent = 0; 116 for (p = list; !ISLAST(p); ++p) { 117 p->n_type = 0; 118 p->n_other = 0; 119 p->n_desc = 0; 120 p->n_value = 0; 121 ++nent; 122 } 123 if (lseek(fd, symoff, SEEK_SET) == -1) 124 return (-1); 125 if ((scoreboard = alloca((size_t)nent)) == NULL) 126 return (-1); 127 (void)memset(scoreboard, 0, (size_t)nent); 128 129 while (symsize > 0) { 130 cc = MIN(symsize, sizeof(nbuf)); 131 if (read(fd, nbuf, cc) != (ssize_t) cc) 132 break; 133 symsize -= cc; 134 for (s = nbuf; cc > 0; ++s, cc -= sizeof(*s)) { 135 long soff = s->n_un.n_strx; 136 137 if (soff == 0 || (s->n_type & N_STAB) != 0) 138 continue; 139 for (p = list, scored = scoreboard; !ISLAST(p); 140 p++, scored++) 141 if (*scored == 0 && 142 !strcmp(&strtab[(size_t)soff], 143 p->n_un.n_name)) { 144 p->n_value = s->n_value; 145 p->n_type = s->n_type; 146 p->n_desc = s->n_desc; 147 p->n_other = s->n_other; 148 *scored = 1; 149 if (--nent <= 0) 150 break; 151 } 152 } 153 } 154 munmap(strtab, strsize); 155 return (nent); 156 } 157 #endif /* NLIST_AOUT */ 158