nlist_coff.c revision 1.2
1 /* $NetBSD: nlist_coff.c,v 1.2 2000/06/09 16:22:54 simonb Exp $ */ 2 3 /* 4 * Copyright (c) 1996 Christopher G. Demetriou. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by Christopher G. Demetriou 17 * for the NetBSD Project. 18 * 4. The name of the author may not be used to endorse or promote products 19 * derived from this software without specific prior written permission 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 #include <sys/cdefs.h> 34 #if defined(LIBC_SCCS) && !defined(lint) 35 __RCSID("$NetBSD: nlist_coff.c,v 1.2 2000/06/09 16:22:54 simonb Exp $"); 36 #endif /* LIBC_SCCS and not lint */ 37 38 #include "namespace.h" 39 #include <sys/param.h> 40 #include <sys/mman.h> 41 #include <sys/stat.h> 42 #include <sys/file.h> 43 44 #include <assert.h> 45 #include <errno.h> 46 #include <stdio.h> 47 #include <string.h> 48 #include <unistd.h> 49 #include <a.out.h> /* for 'struct nlist' declaration */ 50 51 #include "nlist_private.h" 52 #ifdef NLIST_COFF 53 #include <sys/exec_coff.h> 54 #endif 55 56 #ifdef NLIST_COFF 57 #define check(off, size) ((off < 0) || (off + size > mappedsize)) 58 #define BAD do { rv = -1; goto out; } while (/*CONSTCOND*/0) 59 #define BADUNMAP do { rv = -1; goto unmap; } while (/*CONSTCOND*/0) 60 61 #define ES_LEN 18 62 struct coff_extsym { 63 union { 64 char u_name[8]; 65 struct { 66 int u_zero; 67 int u_offset; 68 } s; 69 } u; 70 int32_t es_value; 71 int16_t es_scnum; 72 int16_t es_type; 73 int8_t es_class; 74 int8_t es_numaux; 75 }; 76 #define es_name u.u_name 77 #define es_zero u.s.u_zero 78 #define es_offset u.s.u_offset 79 80 int 81 __fdnlist_coff(fd, list) 82 int fd; 83 struct nlist *list; 84 { 85 struct nlist *p; 86 struct coff_filehdr *filehdrp; 87 struct stat st; 88 char *mappedfile; 89 size_t mappedsize; 90 u_long symoff, extstroff; 91 int rv, nent; 92 long i, nesyms; 93 94 _DIAGASSERT(fd != -1); 95 _DIAGASSERT(list != NULL); 96 97 rv = -1; 98 99 /* 100 * If we can't fstat() the file, something bad is going on. 101 */ 102 if (fstat(fd, &st) < 0) 103 BAD; 104 105 /* 106 * Map the file in its entirety. 107 */ 108 if (st.st_size > SIZE_T_MAX) { 109 errno = EFBIG; 110 BAD; 111 } 112 mappedsize = st.st_size; 113 mappedfile = mmap(NULL, mappedsize, PROT_READ, MAP_PRIVATE|MAP_FILE, 114 fd, 0); 115 if (mappedfile == (char *)-1) 116 BAD; 117 118 /* 119 * Make sure we can access the executable's header 120 * directly, and make sure the recognize the executable 121 * as an COFF binary. 122 */ 123 if (check(0, sizeof *filehdrp)) 124 BADUNMAP; 125 filehdrp = (struct coff_filehdr *)&mappedfile[0]; 126 127 if (COFF_BADMAG(filehdrp)) 128 BADUNMAP; 129 130 /* 131 * Find the symbol list. 132 */ 133 symoff = filehdrp->f_symptr; 134 nesyms = filehdrp->f_nsyms; 135 136 if (check(symoff, ES_LEN * nesyms)) 137 BADUNMAP; 138 extstroff = symoff + ES_LEN * nesyms; 139 140 nent = 0; 141 for (p = list; !ISLAST(p); ++p) { 142 p->n_type = 0; 143 p->n_other = 0; 144 p->n_desc = 0; 145 p->n_value = 0; 146 ++nent; 147 } 148 149 for (i = 0; i < nesyms; i++) { 150 char *symtabname; 151 char *nlistname; 152 struct coff_extsym esym; 153 char name[10]; 154 155 memcpy(&esym, &mappedfile[symoff + ES_LEN * i], ES_LEN); 156 if (esym.es_numaux != 0) { 157 i += esym.es_numaux; /* XXX Skip aux entry */ 158 continue; 159 } 160 161 if (esym.es_zero != 0) { 162 memcpy(name, esym.es_name, 8); 163 name[8] = 0; 164 symtabname = name; 165 } else if (esym.es_offset != 0) 166 symtabname = &mappedfile[extstroff + esym.es_offset]; 167 else 168 continue; 169 170 for (p = list; !ISLAST(p); p++) { 171 nlistname = p->n_un.n_name; 172 if (!strcmp(symtabname, nlistname)) { 173 /* 174 * Translate (roughly) from COFF to nlist 175 */ 176 p->n_value = esym.es_value; 177 p->n_type = N_EXT; /* XXX */ 178 p->n_desc = 0; /* XXX */ 179 p->n_other = 0; /* XXX */ 180 181 if (--nent <= 0) 182 goto done; 183 break; /* into next run of outer loop */ 184 } 185 } 186 } 187 188 done: 189 rv = nent; 190 unmap: 191 munmap(mappedfile, mappedsize); 192 out: 193 return (rv); 194 } 195 196 #endif /* NLIST_COFF */ 197
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