1 /* $NetBSD: nlist_aout.c,v 1.8 1998/11/13 10:26:19 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 1.8 1998/11/13 10:26:19 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 <errno.h> 53 #include <stdio.h> 54 #include <string.h> 55 #include <unistd.h> 56 #include <a.out.h> /* for 'struct nlist' declaration */ 57 58 #include "nlist_private.h" 59 60 #ifdef NLIST_AOUT 61 int 62 __fdnlist_aout(fd, list) 63 int fd; 64 struct nlist *list; 65 { 66 struct nlist *p, *s; 67 char *strtab; 68 off_t stroff, symoff; 69 int nent; 70 size_t strsize, symsize, cc; 71 struct nlist nbuf[1024]; 72 struct exec exec; 73 struct stat st; 74 75 if (pread(fd, &exec, sizeof(exec), (off_t)0) != sizeof(exec) || 76 N_BADMAG(exec) || fstat(fd, &st) < 0) 77 return (-1); 78 79 symoff = N_SYMOFF(exec); 80 symsize = (size_t)exec.a_syms; 81 stroff = symoff + symsize; 82 83 /* Check for files too large to mmap. */ 84 if (st.st_size - stroff > SIZE_T_MAX) { 85 errno = EFBIG; 86 return (-1); 87 } 88 /* 89 * Map string table into our address space. This gives us 90 * an easy way to randomly access all the strings, without 91 * making the memory allocation permanent as with malloc/free 92 * (i.e., munmap will return it to the system). 93 */ 94 strsize = (size_t)(st.st_size - stroff); 95 strtab = mmap(NULL, strsize, PROT_READ, MAP_COPY|MAP_FILE, 96 fd, stroff); 97 if (strtab == (char *)-1) 98 return (-1); 99 /* 100 * clean out any left-over information for all valid entries. 101 * Type and value defined to be 0 if not found; historical 102 * versions cleared other and desc as well. Also figure out 103 * the largest string length so don't read any more of the 104 * string table than we have to. 105 * 106 * XXX clearing anything other than n_type and n_value violates 107 * the semantics given in the man page. 108 */ 109 nent = 0; 110 for (p = list; !ISLAST(p); ++p) { 111 p->n_type = 0; 112 p->n_other = 0; 113 p->n_desc = 0; 114 p->n_value = 0; 115 ++nent; 116 } 117 if (lseek(fd, symoff, SEEK_SET) == -1) 118 return (-1); 119 120 while (symsize > 0) { 121 cc = MIN(symsize, sizeof(nbuf)); 122 if (read(fd, nbuf, cc) != cc) 123 break; 124 symsize -= cc; 125 for (s = nbuf; cc > 0; ++s, cc -= sizeof(*s)) { 126 long soff = s->n_un.n_strx; 127 128 if (soff == 0 || (s->n_type & N_STAB) != 0) 129 continue; 130 for (p = list; !ISLAST(p); p++) 131 if (!strcmp(&strtab[(size_t)soff], 132 p->n_un.n_name)) { 133 p->n_value = s->n_value; 134 p->n_type = s->n_type; 135 p->n_desc = s->n_desc; 136 p->n_other = s->n_other; 137 if (--nent <= 0) 138 break; 139 } 140 } 141 } 142 munmap(strtab, strsize); 143 return (nent); 144 } 145 #endif /* NLIST_AOUT */ 146