nlist_coff.c revision 1.6
1 /* $NetBSD: nlist_coff.c,v 1.6 2006/10/25 20:43:49 uwe 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 1.6 2006/10/25 20:43:49 uwe 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 <a.out.h> /* for 'struct nlist' declaration */ 54 55 #include "nlist_private.h" 56 #ifdef NLIST_COFF 57 #include <sys/exec_coff.h> 58 #endif 59 60 #ifdef NLIST_COFF 61 #define BAD do { rv = -1; goto out; } while (/*CONSTCOND*/0) 62 #define BADUNMAP do { rv = -1; goto unmap; } while (/*CONSTCOND*/0) 63 64 #define ES_LEN 18 65 struct coff_extsym { 66 union { 67 char u_name[8]; 68 struct { 69 int u_zero; 70 int u_offset; 71 } s; 72 } u; 73 int32_t es_value; 74 int16_t es_scnum; 75 int16_t es_type; 76 int8_t es_class; 77 int8_t es_numaux; 78 }; 79 #define es_name u.u_name 80 #define es_zero u.s.u_zero 81 #define es_offset u.s.u_offset 82 83 int 84 __fdnlist_coff(fd, list) 85 int fd; 86 struct nlist *list; 87 { 88 struct nlist *p; 89 struct coff_filehdr *filehdrp; 90 struct stat st; 91 char *mappedfile; 92 size_t mappedsize; 93 u_long symoff, extstroff; 94 int rv, nent; 95 long i, nesyms; 96 97 _DIAGASSERT(fd != -1); 98 _DIAGASSERT(list != NULL); 99 100 rv = -1; 101 102 /* 103 * If we can't fstat() the file, something bad is going on. 104 */ 105 if (fstat(fd, &st) < 0) 106 BAD; 107 108 /* 109 * Map the file in its entirety. 110 */ 111 if (st.st_size > SIZE_T_MAX) { 112 errno = EFBIG; 113 BAD; 114 } 115 mappedsize = st.st_size; 116 mappedfile = mmap(NULL, mappedsize, PROT_READ, MAP_PRIVATE|MAP_FILE, 117 fd, 0); 118 if (mappedfile == (char *)-1) 119 BAD; 120 121 /* 122 * Make sure we can access the executable's header 123 * directly, and make sure we recognize the executable 124 * as an COFF binary. 125 */ 126 if (mappedsize < sizeof (struct coff_filehdr)) 127 BADUNMAP; 128 filehdrp = (struct coff_filehdr *)&mappedfile[0]; 129 130 if (COFF_BADMAG(filehdrp)) 131 BADUNMAP; 132 133 /* 134 * Find the symbol list. 135 */ 136 symoff = filehdrp->f_symptr; 137 nesyms = filehdrp->f_nsyms; 138 139 if (symoff + ES_LEN * nesyms > mappedsize) 140 BADUNMAP; 141 extstroff = symoff + ES_LEN * nesyms; 142 143 nent = 0; 144 for (p = list; !ISLAST(p); ++p) { 145 p->n_type = 0; 146 p->n_other = 0; 147 p->n_desc = 0; 148 p->n_value = 0; 149 ++nent; 150 } 151 152 for (i = 0; i < nesyms; i++) { 153 char *symtabname; 154 char *nlistname; 155 struct coff_extsym esym; 156 char name[10]; 157 158 memcpy(&esym, &mappedfile[symoff + ES_LEN * i], ES_LEN); 159 if (esym.es_numaux != 0) { 160 i += esym.es_numaux; /* XXX Skip aux entry */ 161 continue; 162 } 163 164 if (esym.es_zero != 0) { 165 memcpy(name, esym.es_name, 8); 166 name[8] = 0; 167 symtabname = name; 168 } else if (esym.es_offset != 0) 169 symtabname = &mappedfile[extstroff + esym.es_offset]; 170 else 171 continue; 172 173 for (p = list; !ISLAST(p); p++) { 174 nlistname = p->n_un.n_name; 175 if (!strcmp(symtabname, nlistname)) { 176 /* 177 * Translate (roughly) from COFF to nlist 178 */ 179 p->n_value = esym.es_value; 180 p->n_type = N_EXT; /* XXX */ 181 p->n_desc = 0; /* XXX */ 182 p->n_other = 0; /* XXX */ 183 184 if (--nent <= 0) 185 goto done; 186 break; /* into next run of outer loop */ 187 } 188 } 189 } 190 191 done: 192 rv = nent; 193 unmap: 194 munmap(mappedfile, mappedsize); 195 out: 196 return (rv); 197 } 198 199 #endif /* NLIST_COFF */ 200
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