elf32.c revision 1.1
1 /* $NetBSD: elf32.c,v 1.1 2006/09/07 00:50:45 ad Exp $ */ 2 3 /*- 4 * Copyright (c) 2006 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Andrew Doran. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 /* 40 * Copyright (c) 1996 Christopher G. Demetriou 41 * All rights reserved. 42 * 43 * Redistribution and use in source and binary forms, with or without 44 * modification, are permitted provided that the following conditions 45 * are met: 46 * 1. Redistributions of source code must retain the above copyright 47 * notice, this list of conditions and the following disclaimer. 48 * 2. Redistributions in binary form must reproduce the above copyright 49 * notice, this list of conditions and the following disclaimer in the 50 * documentation and/or other materials provided with the distribution. 51 * 3. All advertising materials mentioning features or use of this software 52 * must display the following acknowledgement: 53 * This product includes software developed for the 54 * NetBSD Project. See http://www.NetBSD.org/ for 55 * information about NetBSD. 56 * 4. The name of the author may not be used to endorse or promote products 57 * derived from this software without specific prior written permission. 58 * 59 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 60 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 61 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 62 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 63 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 64 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 65 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 66 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 67 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 68 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 69 * 70 * <<Id: LICENSE,v 1.2 2000/06/14 15:57:33 cgd Exp>> 71 */ 72 73 #include <sys/cdefs.h> 74 #if !defined(lint) 75 __RCSID("$NetBSD: elf32.c,v 1.1 2006/09/07 00:50:45 ad Exp $"); 76 #endif 77 78 #ifndef ELFSIZE 79 #define ELFSIZE 32 80 #endif 81 82 #include <sys/param.h> 83 #include <sys/exec_elf.h> 84 #include <sys/queue.h> 85 #include <sys/lockstat.h> 86 87 #include <stdio.h> 88 #include <stdlib.h> 89 #include <string.h> 90 #include <unistd.h> 91 #include <err.h> 92 93 #include "extern.h" 94 95 #if (ELFSIZE == 32) 96 #define NAME(x) x##32 97 #elif (ELFSIZE == 64) 98 #define NAME(x) x##64 99 #endif 100 101 static int nsyms; 102 static Elf_Sym *symp; 103 static char *strp; 104 105 int 106 NAME(loadsym)(int fd) 107 { 108 Elf_Shdr symhdr, strhdr; 109 Elf_Ehdr ehdr; 110 size_t sz; 111 off_t off; 112 int i; 113 114 /* 115 * Read the ELF header and make sure it's OK. 116 */ 117 if (pread(fd, &ehdr, sizeof(ehdr), 0) != sizeof(ehdr)) 118 return -1; 119 120 if (memcmp(ehdr.e_ident, ELFMAG, SELFMAG) != 0 || 121 ehdr.e_ident[EI_CLASS] != ELFCLASS) 122 return -1; 123 124 switch (ehdr.e_machine) { 125 ELFDEFNNAME(MACHDEP_ID_CASES) 126 default: 127 return -1; 128 } 129 130 /* 131 * Find the symbol table header, and make sure the binary isn't 132 * stripped. 133 */ 134 off = ehdr.e_shoff; 135 for (i = 0; i < ehdr.e_shnum; i++, off += sizeof(symhdr)) { 136 sz = pread(fd, &symhdr, sizeof(symhdr), off); 137 if (sz != sizeof(symhdr)) 138 err(EXIT_FAILURE, "pread (section headers)"); 139 if (symhdr.sh_type == SHT_SYMTAB) 140 break; 141 } 142 if (i == ehdr.e_shnum || symhdr.sh_offset == 0) 143 err(EXIT_FAILURE, "namelist is stripped"); 144 145 /* 146 * Pull in the string table header, and then read in both the symbol 147 * table and string table proper. 148 * 149 * XXX We can't use mmap(), as /dev/ksyms doesn't support mmap yet. 150 */ 151 off = ehdr.e_shoff + symhdr.sh_link * sizeof(symhdr); 152 if (pread(fd, &strhdr, sizeof(strhdr), off) != sizeof(strhdr)) 153 err(EXIT_FAILURE, "pread"); 154 155 if ((symp = malloc(symhdr.sh_size)) == NULL) 156 err(EXIT_FAILURE, "malloc (symbol table)"); 157 sz = pread(fd, symp, symhdr.sh_size, symhdr.sh_offset ); 158 if (sz != symhdr.sh_size) 159 err(EXIT_FAILURE, "pread (symbol table)"); 160 161 if ((strp = malloc(strhdr.sh_size)) == NULL) 162 err(EXIT_FAILURE, "malloc (string table)"); 163 sz = pread(fd, strp, strhdr.sh_size, strhdr.sh_offset); 164 if (sz != strhdr.sh_size) 165 err(EXIT_FAILURE, "pread (string table)"); 166 167 nsyms = (int)(symhdr.sh_size / sizeof(Elf_Sym)); 168 169 return 0; 170 } 171 172 int 173 NAME(findsym)(findsym_t find, char *name, uintptr_t *start, uintptr_t *end) 174 { 175 static int lastptr[FIND_MAX]; 176 uintptr_t sa, ea; 177 int i, rv; 178 179 rv = -1; 180 181 #ifdef dump_core 182 for (i = lastptr[find];;) { 183 #else 184 for (i = 0; i < nsyms; i++) { 185 #endif 186 switch (find) { 187 case LOCK_BYNAME: 188 if (ELF_ST_TYPE(symp[i].st_info) != STT_OBJECT) 189 break; 190 if (strcmp(&strp[symp[i].st_name], name) != 0) 191 break; 192 *start = (uintptr_t)symp[i].st_value; 193 *end = *start + (uintptr_t)symp[i].st_size; 194 goto found; 195 196 case LOCK_BYADDR: 197 if (ELF_ST_TYPE(symp[i].st_info) != STT_OBJECT) 198 break; 199 if (*start != (uintptr_t)symp[i].st_value) 200 break; 201 strcpy(name, &strp[symp[i].st_name]); 202 goto found; 203 204 case FUNC_BYNAME: 205 if (ELF_ST_TYPE(symp[i].st_info) != STT_FUNC) 206 break; 207 if (strcmp(&strp[symp[i].st_name], name) != 0) 208 break; 209 *start = (uintptr_t)symp[i].st_value; 210 *end = *start + (uintptr_t)symp[i].st_size; 211 goto found; 212 213 case FUNC_BYADDR: 214 if (ELF_ST_TYPE(symp[i].st_info) != STT_FUNC) 215 break; 216 sa = (uintptr_t)symp[i].st_value; 217 ea = sa + (uintptr_t)symp[i].st_size - 1; 218 if (*start < sa || *start > ea) 219 break; 220 sprintf(name, "%s+0x%x", 221 &strp[symp[i].st_name], (int)(*start - sa)); 222 goto found; 223 224 default: 225 break; 226 } 227 228 #ifdef dump_core 229 if (++i >= nsyms) 230 i = 0; 231 if (i == lastptr[find]) 232 return -1; 233 #endif 234 } 235 236 return -1; 237 238 found: 239 lastptr[find] = i; 240 return 0; 241 } 242
Indexes created Tue Sep 30 11:09:46 GMT 2025