1 /* $NetBSD: nlist_coff.c,v 1.11 2012/03/22 14:18:34 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_coff.c,v 1.11 2012/03/22 14:18:34 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_COFF 57 #include <sys/exec_coff.h> 58 #endif 59 60 #ifdef NLIST_COFF 61 62 #define ES_LEN 18 63 struct coff_extsym { 64 union { 65 char u_name[8]; 66 struct { 67 int u_zero; 68 int u_offset; 69 } s; 70 } u; 71 int32_t es_value; 72 int16_t es_scnum; 73 int16_t es_type; 74 int8_t es_class; 75 int8_t es_numaux; 76 }; 77 #define es_name u.u_name 78 #define es_zero u.s.u_zero 79 #define es_offset u.s.u_offset 80 81 int 82 __fdnlist_coff(int fd, struct nlist *list) 83 { 84 struct nlist *p; 85 struct coff_filehdr *filehdrp; 86 struct stat st; 87 char *mappedfile; 88 size_t mappedsize; 89 u_long symoff, extstroff; 90 int rv, nent; 91 long i, nesyms; 92 93 _DIAGASSERT(fd != -1); 94 _DIAGASSERT(list != NULL); 95 96 rv = -1; 97 98 /* 99 * If we can't fstat() the file, something bad is going on. 100 */ 101 if (fstat(fd, &st) < 0) 102 goto out; 103 104 /* 105 * Map the file in its entirety. 106 */ 107 if ((uintmax_t)st.st_size > (uintmax_t)SIZE_T_MAX) { 108 errno = EFBIG; 109 goto out; 110 } 111 mappedsize = (size_t)st.st_size; 112 mappedfile = mmap(NULL, mappedsize, PROT_READ, MAP_PRIVATE|MAP_FILE, 113 fd, 0); 114 if (mappedfile == MAP_FAILED) 115 goto out; 116 117 /* 118 * Make sure we can access the executable's header 119 * directly, and make sure we recognize the executable 120 * as an COFF binary. 121 */ 122 if (mappedsize < sizeof (struct coff_filehdr)) 123 goto unmap; 124 filehdrp = (void *)&mappedfile[0]; 125 126 if (COFF_BADMAG(filehdrp)) 127 goto unmap; 128 129 /* 130 * Find the symbol list. 131 */ 132 symoff = filehdrp->f_symptr; 133 nesyms = filehdrp->f_nsyms; 134 135 if (symoff + ES_LEN * nesyms > mappedsize) 136 goto unmap; 137 extstroff = symoff + ES_LEN * nesyms; 138 139 nent = 0; 140 for (p = list; !ISLAST(p); ++p) { 141 p->n_type = 0; 142 p->n_other = 0; 143 p->n_desc = 0; 144 p->n_value = 0; 145 ++nent; 146 } 147 148 for (i = 0; i < nesyms; i++) { 149 char *symtabname; 150 const char *nlistname; 151 struct coff_extsym esym; 152 char name[10]; 153 154 memcpy(&esym, &mappedfile[symoff + ES_LEN * i], ES_LEN); 155 if (esym.es_numaux != 0) { 156 i += esym.es_numaux; /* XXX Skip aux entry */ 157 continue; 158 } 159 160 if (esym.es_zero != 0) { 161 memcpy(name, esym.es_name, 8); 162 name[8] = 0; 163 symtabname = name; 164 } else if (esym.es_offset != 0) 165 symtabname = &mappedfile[extstroff + esym.es_offset]; 166 else 167 continue; 168 169 for (p = list; !ISLAST(p); p++) { 170 nlistname = N_NAME(p); 171 if (!strcmp(symtabname, nlistname)) { 172 /* 173 * Translate (roughly) from COFF to nlist 174 */ 175 p->n_value = esym.es_value; 176 p->n_type = N_EXT; /* XXX */ 177 p->n_desc = 0; /* XXX */ 178 p->n_other = 0; /* XXX */ 179 180 if (--nent <= 0) 181 goto done; 182 break; /* into next run of outer loop */ 183 } 184 } 185 } 186 187 done: 188 rv = nent; 189 unmap: 190 munmap(mappedfile, mappedsize); 191 out: 192 return rv; 193 } 194 195 #endif /* NLIST_COFF */ 196
Indexes created Sun Sep 21 16:09:51 GMT 2025