Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 1 | /* Create new ELF header. |
| 2 | Copyright (C) 1998, 1999, 2000, 2002 Red Hat, Inc. |
Mark Wielaard | de2ed97 | 2012-06-05 17:15:16 +0200 | [diff] [blame] | 3 | This file is part of elfutils. |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 4 | Written by Ulrich Drepper <drepper@redhat.com>, 1998. |
| 5 | |
Mark Wielaard | de2ed97 | 2012-06-05 17:15:16 +0200 | [diff] [blame] | 6 | This file is free software; you can redistribute it and/or modify |
| 7 | it under the terms of either |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 8 | |
Mark Wielaard | de2ed97 | 2012-06-05 17:15:16 +0200 | [diff] [blame] | 9 | * the GNU Lesser General Public License as published by the Free |
| 10 | Software Foundation; either version 3 of the License, or (at |
| 11 | your option) any later version |
| 12 | |
| 13 | or |
| 14 | |
| 15 | * the GNU General Public License as published by the Free |
| 16 | Software Foundation; either version 2 of the License, or (at |
| 17 | your option) any later version |
| 18 | |
| 19 | or both in parallel, as here. |
| 20 | |
| 21 | elfutils is distributed in the hope that it will be useful, but |
Ulrich Drepper | 361df7d | 2006-04-04 21:38:57 +0000 | [diff] [blame] | 22 | WITHOUT ANY WARRANTY; without even the implied warranty of |
| 23 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 24 | General Public License for more details. |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 25 | |
Mark Wielaard | de2ed97 | 2012-06-05 17:15:16 +0200 | [diff] [blame] | 26 | You should have received copies of the GNU General Public License and |
| 27 | the GNU Lesser General Public License along with this program. If |
| 28 | not, see <http://www.gnu.org/licenses/>. */ |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 29 | |
| 30 | #ifdef HAVE_CONFIG_H |
| 31 | # include <config.h> |
| 32 | #endif |
| 33 | |
| 34 | #include <stdlib.h> |
| 35 | #include <string.h> |
| 36 | |
| 37 | #include "libelfP.h" |
| 38 | |
| 39 | #ifndef LIBELFBITS |
| 40 | # define LIBELFBITS 32 |
| 41 | #endif |
| 42 | |
| 43 | |
| 44 | ElfW2(LIBELFBITS,Ehdr) * |
| 45 | elfw2(LIBELFBITS,newehdr) (elf) |
| 46 | Elf *elf; |
| 47 | { |
| 48 | ElfW2(LIBELFBITS,Ehdr) *result; |
| 49 | |
| 50 | if (elf == NULL) |
| 51 | return NULL; |
| 52 | |
| 53 | if (unlikely (elf->kind != ELF_K_ELF)) |
| 54 | { |
| 55 | __libelf_seterrno (ELF_E_INVALID_HANDLE); |
| 56 | return NULL; |
| 57 | } |
| 58 | |
Roland McGrath | b4d6f0f | 2008-08-25 22:55:17 +0000 | [diff] [blame] | 59 | rwlock_wrlock (elf->lock); |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 60 | |
| 61 | if (elf->class == 0) |
| 62 | elf->class = ELFW(ELFCLASS,LIBELFBITS); |
| 63 | else if (unlikely (elf->class != ELFW(ELFCLASS,LIBELFBITS))) |
| 64 | { |
| 65 | __libelf_seterrno (ELF_E_INVALID_CLASS); |
| 66 | result = NULL; |
| 67 | goto out; |
| 68 | } |
| 69 | |
| 70 | /* Don't create an ELF header if one already exists. */ |
| 71 | if (elf->state.ELFW(elf,LIBELFBITS).ehdr == NULL) |
| 72 | { |
| 73 | /* We use the memory in the ELF descriptor. */ |
| 74 | elf->state.ELFW(elf,LIBELFBITS).ehdr = |
| 75 | &elf->state.ELFW(elf,LIBELFBITS).ehdr_mem; |
| 76 | |
| 77 | /* We clear this memory. */ |
| 78 | memset (elf->state.ELFW(elf,LIBELFBITS).ehdr, '\0', |
| 79 | sizeof (ElfW2(LIBELFBITS,Ehdr))); |
| 80 | |
| 81 | /* Mark the ELF header has modified. */ |
| 82 | elf->state.ELFW(elf,LIBELFBITS).ehdr_flags |= ELF_F_DIRTY; |
| 83 | } |
| 84 | |
| 85 | result = elf->state.ELFW(elf,LIBELFBITS).ehdr; |
| 86 | |
| 87 | out: |
Roland McGrath | b4d6f0f | 2008-08-25 22:55:17 +0000 | [diff] [blame] | 88 | rwlock_unlock (elf->lock); |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 89 | |
| 90 | return result; |
| 91 | } |
| 92 | INTDEF(elfw2(LIBELFBITS,newehdr)) |