1*3365bf71Slukem /* $NetBSD: elf32.c,v 1.8 2009/04/16 06:14:13 lukem Exp $ */ 2297f4619Sad 3297f4619Sad /*- 4297f4619Sad * Copyright (c) 2006 The NetBSD Foundation, Inc. 5297f4619Sad * All rights reserved. 6297f4619Sad * 7297f4619Sad * This code is derived from software contributed to The NetBSD Foundation 8297f4619Sad * by Andrew Doran. 9297f4619Sad * 10297f4619Sad * Redistribution and use in source and binary forms, with or without 11297f4619Sad * modification, are permitted provided that the following conditions 12297f4619Sad * are met: 13297f4619Sad * 1. Redistributions of source code must retain the above copyright 14297f4619Sad * notice, this list of conditions and the following disclaimer. 15297f4619Sad * 2. Redistributions in binary form must reproduce the above copyright 16297f4619Sad * notice, this list of conditions and the following disclaimer in the 17297f4619Sad * documentation and/or other materials provided with the distribution. 18297f4619Sad * 19297f4619Sad * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20297f4619Sad * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21297f4619Sad * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22297f4619Sad * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23297f4619Sad * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24297f4619Sad * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25297f4619Sad * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26297f4619Sad * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27297f4619Sad * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28297f4619Sad * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29297f4619Sad * POSSIBILITY OF SUCH DAMAGE. 30297f4619Sad */ 31297f4619Sad 32297f4619Sad /* 33297f4619Sad * Copyright (c) 1996 Christopher G. Demetriou 34297f4619Sad * All rights reserved. 35297f4619Sad * 36297f4619Sad * Redistribution and use in source and binary forms, with or without 37297f4619Sad * modification, are permitted provided that the following conditions 38297f4619Sad * are met: 39297f4619Sad * 1. Redistributions of source code must retain the above copyright 40297f4619Sad * notice, this list of conditions and the following disclaimer. 41297f4619Sad * 2. Redistributions in binary form must reproduce the above copyright 42297f4619Sad * notice, this list of conditions and the following disclaimer in the 43297f4619Sad * documentation and/or other materials provided with the distribution. 44297f4619Sad * 3. All advertising materials mentioning features or use of this software 45297f4619Sad * must display the following acknowledgement: 46297f4619Sad * This product includes software developed for the 47297f4619Sad * NetBSD Project. See http://www.NetBSD.org/ for 48297f4619Sad * information about NetBSD. 49297f4619Sad * 4. The name of the author may not be used to endorse or promote products 50297f4619Sad * derived from this software without specific prior written permission. 51297f4619Sad * 52297f4619Sad * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 53297f4619Sad * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 54297f4619Sad * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 55297f4619Sad * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 56297f4619Sad * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 57297f4619Sad * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 58297f4619Sad * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 59297f4619Sad * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 60297f4619Sad * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 61297f4619Sad * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 62297f4619Sad * 63297f4619Sad * <<Id: LICENSE,v 1.2 2000/06/14 15:57:33 cgd Exp>> 64297f4619Sad */ 65297f4619Sad 66297f4619Sad #include <sys/cdefs.h> 67297f4619Sad #if !defined(lint) 68*3365bf71Slukem __RCSID("$NetBSD: elf32.c,v 1.8 2009/04/16 06:14:13 lukem Exp $"); 69297f4619Sad #endif 70297f4619Sad 71297f4619Sad #ifndef ELFSIZE 72297f4619Sad #define ELFSIZE 32 73297f4619Sad #endif 74297f4619Sad 75297f4619Sad #include <sys/param.h> 76297f4619Sad #include <sys/exec_elf.h> 77297f4619Sad #include <sys/queue.h> 7896d4a987Sad 7996d4a987Sad #include <dev/lockstat.h> 80297f4619Sad 81297f4619Sad #include <stdio.h> 82297f4619Sad #include <stdlib.h> 83297f4619Sad #include <string.h> 84297f4619Sad #include <unistd.h> 85297f4619Sad #include <err.h> 86297f4619Sad 87297f4619Sad #include "extern.h" 88297f4619Sad 89297f4619Sad #if (ELFSIZE == 32) 90297f4619Sad #define NAME(x) x##32 91297f4619Sad #elif (ELFSIZE == 64) 92297f4619Sad #define NAME(x) x##64 93297f4619Sad #endif 94297f4619Sad 95297f4619Sad static int nsyms; 96297f4619Sad static Elf_Sym *symp; 97297f4619Sad static char *strp; 98297f4619Sad 99297f4619Sad int 100297f4619Sad NAME(loadsym)(int fd) 101297f4619Sad { 102297f4619Sad Elf_Shdr symhdr, strhdr; 103297f4619Sad Elf_Ehdr ehdr; 104297f4619Sad size_t sz; 105297f4619Sad off_t off; 106297f4619Sad int i; 107297f4619Sad 108297f4619Sad /* 109297f4619Sad * Read the ELF header and make sure it's OK. 110297f4619Sad */ 111297f4619Sad if (pread(fd, &ehdr, sizeof(ehdr), 0) != sizeof(ehdr)) 112297f4619Sad return -1; 113297f4619Sad 114297f4619Sad if (memcmp(ehdr.e_ident, ELFMAG, SELFMAG) != 0 || 115297f4619Sad ehdr.e_ident[EI_CLASS] != ELFCLASS) 116297f4619Sad return -1; 117297f4619Sad 118297f4619Sad switch (ehdr.e_machine) { 119297f4619Sad ELFDEFNNAME(MACHDEP_ID_CASES) 120297f4619Sad default: 121297f4619Sad return -1; 122297f4619Sad } 123297f4619Sad 124297f4619Sad /* 125297f4619Sad * Find the symbol table header, and make sure the binary isn't 126297f4619Sad * stripped. 127297f4619Sad */ 128297f4619Sad off = ehdr.e_shoff; 129297f4619Sad for (i = 0; i < ehdr.e_shnum; i++, off += sizeof(symhdr)) { 130297f4619Sad sz = pread(fd, &symhdr, sizeof(symhdr), off); 131297f4619Sad if (sz != sizeof(symhdr)) 132297f4619Sad err(EXIT_FAILURE, "pread (section headers)"); 133297f4619Sad if (symhdr.sh_type == SHT_SYMTAB) 134297f4619Sad break; 135297f4619Sad } 136297f4619Sad if (i == ehdr.e_shnum || symhdr.sh_offset == 0) 137297f4619Sad err(EXIT_FAILURE, "namelist is stripped"); 138297f4619Sad 139297f4619Sad /* 140297f4619Sad * Pull in the string table header, and then read in both the symbol 141297f4619Sad * table and string table proper. 142297f4619Sad * 143297f4619Sad * XXX We can't use mmap(), as /dev/ksyms doesn't support mmap yet. 144297f4619Sad */ 145297f4619Sad off = ehdr.e_shoff + symhdr.sh_link * sizeof(symhdr); 146297f4619Sad if (pread(fd, &strhdr, sizeof(strhdr), off) != sizeof(strhdr)) 147297f4619Sad err(EXIT_FAILURE, "pread"); 148297f4619Sad 149297f4619Sad if ((symp = malloc(symhdr.sh_size)) == NULL) 150297f4619Sad err(EXIT_FAILURE, "malloc (symbol table)"); 151297f4619Sad sz = pread(fd, symp, symhdr.sh_size, symhdr.sh_offset ); 152297f4619Sad if (sz != symhdr.sh_size) 153297f4619Sad err(EXIT_FAILURE, "pread (symbol table)"); 154297f4619Sad 155297f4619Sad if ((strp = malloc(strhdr.sh_size)) == NULL) 156297f4619Sad err(EXIT_FAILURE, "malloc (string table)"); 157297f4619Sad sz = pread(fd, strp, strhdr.sh_size, strhdr.sh_offset); 158297f4619Sad if (sz != strhdr.sh_size) 159297f4619Sad err(EXIT_FAILURE, "pread (string table)"); 160297f4619Sad 161297f4619Sad nsyms = (int)(symhdr.sh_size / sizeof(Elf_Sym)); 162297f4619Sad 163297f4619Sad return 0; 164297f4619Sad } 165297f4619Sad 166297f4619Sad int 167297f4619Sad NAME(findsym)(findsym_t find, char *name, uintptr_t *start, uintptr_t *end) 168297f4619Sad { 169297f4619Sad static int lastptr[FIND_MAX]; 170297f4619Sad uintptr_t sa, ea; 171*3365bf71Slukem int i, rv, off; 172*3365bf71Slukem Elf_Byte st; 17312793652Sad 17412793652Sad switch (find) { 17512793652Sad case LOCK_BYNAME: 17612793652Sad case LOCK_BYADDR: 17712793652Sad st = STT_OBJECT; 17812793652Sad break; 17912793652Sad case FUNC_BYNAME: 18012793652Sad case FUNC_BYADDR: 18112793652Sad st = STT_FUNC; 18212793652Sad break; 18312793652Sad default: 18412793652Sad return -1; 18512793652Sad } 186297f4619Sad 187297f4619Sad rv = -1; 188297f4619Sad 189297f4619Sad #ifdef dump_core 190297f4619Sad for (i = lastptr[find];;) { 191297f4619Sad #else 192297f4619Sad for (i = 0; i < nsyms; i++) { 193297f4619Sad #endif 194297f4619Sad switch (find) { 195297f4619Sad case LOCK_BYNAME: 19612793652Sad case FUNC_BYNAME: 19712793652Sad if (ELF_ST_TYPE(symp[i].st_info) != st) 198297f4619Sad break; 199297f4619Sad if (strcmp(&strp[symp[i].st_name], name) != 0) 200297f4619Sad break; 201297f4619Sad *start = (uintptr_t)symp[i].st_value; 202297f4619Sad *end = *start + (uintptr_t)symp[i].st_size; 203297f4619Sad goto found; 204297f4619Sad 205297f4619Sad case LOCK_BYADDR: 206297f4619Sad case FUNC_BYADDR: 20712793652Sad if (ELF_ST_TYPE(symp[i].st_info) != st) 208297f4619Sad break; 209297f4619Sad sa = (uintptr_t)symp[i].st_value; 210297f4619Sad ea = sa + (uintptr_t)symp[i].st_size - 1; 211297f4619Sad if (*start < sa || *start > ea) 212297f4619Sad break; 21312793652Sad off = (int)(*start - sa); 2145c2240bbSad *start = sa; 2155c2240bbSad if (end != NULL) 2165c2240bbSad *end = ea; 2175c2240bbSad if (name == NULL) 2185c2240bbSad goto found; 21912793652Sad if (off == 0) 2209f07c24eSad strlcpy(name, &strp[symp[i].st_name], 2219f07c24eSad NAME_SIZE); 22212793652Sad else 2239f07c24eSad snprintf(name, NAME_SIZE, "%s+%x", 22412793652Sad &strp[symp[i].st_name], off); 225297f4619Sad goto found; 226297f4619Sad 227297f4619Sad default: 228297f4619Sad break; 229297f4619Sad } 230297f4619Sad 231297f4619Sad #ifdef dump_core 232297f4619Sad if (++i >= nsyms) 233297f4619Sad i = 0; 234297f4619Sad if (i == lastptr[find]) 235297f4619Sad return -1; 236297f4619Sad #endif 237297f4619Sad } 238297f4619Sad 239297f4619Sad return -1; 240297f4619Sad 241297f4619Sad found: 242297f4619Sad lastptr[find] = i; 243297f4619Sad return 0; 244297f4619Sad } 245