elf.c (2601B)
1 /* $Id: //depot/blt/lib/libdl/elf.c#3 $ 2 ** 3 ** Copyright 1998-1999 Sidney Cammeresi 4 ** 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. The name of the author may not be used to endorse or promote products 15 ** derived from this software without specific prior written permission. 16 ** 17 ** THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 ** IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 ** OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 ** IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 ** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 ** NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 ** THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include <stddef.h> 30 #include <string.h> 31 #include <elf.h> 32 #include <blt/libsyms.h> 33 34 elf32_sec_hdr_t *elf_find_section_hdr (elf32_hdr_t *hdr, char *name) 35 { 36 char *section_name; 37 int i; 38 elf32_sec_hdr_t *sec_hdr; 39 40 sec_hdr = (elf32_sec_hdr_t *) ((unsigned int) hdr + hdr->e_shoff + 41 hdr->e_shstrndx * hdr->e_shentsize); 42 section_name = (char *) ((unsigned int) hdr + sec_hdr->sh_offset); 43 sec_hdr = (elf32_sec_hdr_t *) ((unsigned int) hdr + hdr->e_shoff); 44 for (i = 0; i < hdr->e_shnum; i++, sec_hdr = (elf32_sec_hdr_t *) 45 ((unsigned int) sec_hdr + hdr->e_shentsize)) 46 if (!strcmp (section_name + sec_hdr->sh_name, name)) 47 return sec_hdr; 48 return NULL; 49 } 50 51 void *elf_find_section_data (elf32_hdr_t *hdr, char *name) 52 { 53 elf32_sec_hdr_t *sec_hdr; 54 55 sec_hdr = elf_find_section_hdr (hdr, name); 56 return (sec_hdr == NULL) ? NULL : (void *) ((unsigned int) hdr + 57 sec_hdr->sh_offset); 58 } 59 60 int elf_section_size (elf32_hdr_t *hdr, char *name) 61 { 62 elf32_sec_hdr_t *sec_hdr; 63 64 sec_hdr = elf_find_section_hdr (hdr, name); 65 return (sec_hdr == NULL) ? 0 : sec_hdr->sh_size; 66 } 67