1 /* Create new ELF header. 2 Copyright (C) 1998, 1999, 2000, 2002 Red Hat, Inc. 3 Written by Ulrich Drepper <drepper (at) redhat.com>, 1998. 4 5 This program is free software; you can redistribute it and/or modify 6 it under the terms of the GNU General Public License as published by 7 the Free Software Foundation, version 2. 8 9 This program is distributed in the hope that it will be useful, 10 but WITHOUT ANY WARRANTY; without even the implied warranty of 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 GNU General Public License for more details. 13 14 You should have received a copy of the GNU General Public License 15 along with this program; if not, write to the Free Software Foundation, 16 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ 17 18 #ifdef HAVE_CONFIG_H 19 # include <config.h> 20 #endif 21 22 #include <stdlib.h> 23 #include <string.h> 24 25 #include "libelfP.h" 26 27 #ifndef LIBELFBITS 28 # define LIBELFBITS 32 29 #endif 30 31 32 ElfW2(LIBELFBITS,Ehdr) * 33 elfw2(LIBELFBITS,newehdr) (elf) 34 Elf *elf; 35 { 36 ElfW2(LIBELFBITS,Ehdr) *result; 37 38 if (elf == NULL) 39 return NULL; 40 41 if (unlikely (elf->kind != ELF_K_ELF)) 42 { 43 __libelf_seterrno (ELF_E_INVALID_HANDLE); 44 return NULL; 45 } 46 47 rwlock_wrlock (elf->lock); 48 49 if (elf->class == 0) 50 elf->class = ELFW(ELFCLASS,LIBELFBITS); 51 else if (unlikely (elf->class != ELFW(ELFCLASS,LIBELFBITS))) 52 { 53 __libelf_seterrno (ELF_E_INVALID_CLASS); 54 result = NULL; 55 goto out; 56 } 57 58 /* Don't create an ELF header if one already exists. */ 59 if (elf->state.ELFW(elf,LIBELFBITS).ehdr == NULL) 60 { 61 /* We use the memory in the ELF descriptor. */ 62 elf->state.ELFW(elf,LIBELFBITS).ehdr = 63 &elf->state.ELFW(elf,LIBELFBITS).ehdr_mem; 64 65 /* We clear this memory. */ 66 memset (elf->state.ELFW(elf,LIBELFBITS).ehdr, '\0', 67 sizeof (ElfW2(LIBELFBITS,Ehdr))); 68 69 /* Mark the ELF header has modified. */ 70 elf->state.ELFW(elf,LIBELFBITS).ehdr_flags |= ELF_F_DIRTY; 71 } 72 73 result = elf->state.ELFW(elf,LIBELFBITS).ehdr; 74 75 out: 76 rwlock_unlock (elf->lock); 77 78 return result; 79 } 80 INTDEF(elfw2(LIBELFBITS,newehdr)) 81
