nlist_coff.c revision 1.4
1 /* $NetBSD: nlist_coff.c,v 1.4 2000/06/14 17:25:01 cgd 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 1.4 2000/06/14 17:25:01 cgd 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 check(off, size) ((off < 0) || (off + size > mappedsize)) 62 #define BAD do { rv = -1; goto out; } while (/*CONSTCOND*/0) 63 #define BADUNMAP do { rv = -1; goto unmap; } while (/*CONSTCOND*/0) 64 65 #define ES_LEN 18 66 struct coff_extsym { 67 union { 68 char u_name[8]; 69 struct { 70 int u_zero; 71 int u_offset; 72 } s; 73 } u; 74 int32_t es_value; 75 int16_t es_scnum; 76 int16_t es_type; 77 int8_t es_class; 78 int8_t es_numaux; 79 }; 80 #define es_name u.u_name 81 #define es_zero u.s.u_zero 82 #define es_offset u.s.u_offset 83 84 int 85 __fdnlist_coff(fd, list) 86 int fd; 87 struct nlist *list; 88 { 89 struct nlist *p; 90 struct coff_filehdr *filehdrp; 91 struct stat st; 92 char *mappedfile; 93 size_t mappedsize; 94 u_long symoff, extstroff; 95 int rv, nent; 96 long i, nesyms; 97 98 _DIAGASSERT(fd != -1); 99 _DIAGASSERT(list != NULL); 100 101 rv = -1; 102 103 /* 104 * If we can't fstat() the file, something bad is going on. 105 */ 106 if (fstat(fd, &st) < 0) 107 BAD; 108 109 /* 110 * Map the file in its entirety. 111 */ 112 if (st.st_size > SIZE_T_MAX) { 113 errno = EFBIG; 114 BAD; 115 } 116 mappedsize = st.st_size; 117 mappedfile = mmap(NULL, mappedsize, PROT_READ, MAP_PRIVATE|MAP_FILE, 118 fd, 0); 119 if (mappedfile == (char *)-1) 120 BAD; 121 122 /* 123 * Make sure we can access the executable's header 124 * directly, and make sure the recognize the executable 125 * as an COFF binary. 126 */ 127 if (check(0, sizeof *filehdrp)) 128 BADUNMAP; 129 filehdrp = (struct coff_filehdr *)&mappedfile[0]; 130 131 if (COFF_BADMAG(filehdrp)) 132 BADUNMAP; 133 134 /* 135 * Find the symbol list. 136 */ 137 symoff = filehdrp->f_symptr; 138 nesyms = filehdrp->f_nsyms; 139 140 if (check(symoff, ES_LEN * nesyms)) 141 BADUNMAP; 142 extstroff = symoff + ES_LEN * nesyms; 143 144 nent = 0; 145 for (p = list; !ISLAST(p); ++p) { 146 p->n_type = 0; 147 p->n_other = 0; 148 p->n_desc = 0; 149 p->n_value = 0; 150 ++nent; 151 } 152 153 for (i = 0; i < nesyms; i++) { 154 char *symtabname; 155 char *nlistname; 156 struct coff_extsym esym; 157 char name[10]; 158 159 memcpy(&esym, &mappedfile[symoff + ES_LEN * i], ES_LEN); 160 if (esym.es_numaux != 0) { 161 i += esym.es_numaux; /* XXX Skip aux entry */ 162 continue; 163 } 164 165 if (esym.es_zero != 0) { 166 memcpy(name, esym.es_name, 8); 167 name[8] = 0; 168 symtabname = name; 169 } else if (esym.es_offset != 0) 170 symtabname = &mappedfile[extstroff + esym.es_offset]; 171 else 172 continue; 173 174 for (p = list; !ISLAST(p); p++) { 175 nlistname = p->n_un.n_name; 176 if (!strcmp(symtabname, nlistname)) { 177 /* 178 * Translate (roughly) from COFF to nlist 179 */ 180 p->n_value = esym.es_value; 181 p->n_type = N_EXT; /* XXX */ 182 p->n_desc = 0; /* XXX */ 183 p->n_other = 0; /* XXX */ 184 185 if (--nent <= 0) 186 goto done; 187 break; /* into next run of outer loop */ 188 } 189 } 190 } 191 192 done: 193 rv = nent; 194 unmap: 195 munmap(mappedfile, mappedsize); 196 out: 197 return (rv); 198 } 199 200 #endif /* NLIST_COFF */ 201
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