Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 1 | /* Create new ELF program header table. |
Roland McGrath | 6fd3cd1 | 2010-01-07 19:41:04 -0800 | [diff] [blame] | 2 | Copyright (C) 1999-2010 Red Hat, Inc. |
Ulrich Drepper | 361df7d | 2006-04-04 21:38:57 +0000 | [diff] [blame] | 3 | This file is part of Red Hat elfutils. |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 4 | Written by Ulrich Drepper <drepper@redhat.com>, 1998. |
| 5 | |
Ulrich Drepper | 361df7d | 2006-04-04 21:38:57 +0000 | [diff] [blame] | 6 | Red Hat elfutils is free software; you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as published by the |
| 8 | Free Software Foundation; version 2 of the License. |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 9 | |
Ulrich Drepper | 361df7d | 2006-04-04 21:38:57 +0000 | [diff] [blame] | 10 | Red Hat elfutils is distributed in the hope that it will be useful, but |
| 11 | WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | General Public License for more details. |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 14 | |
Ulrich Drepper | 361df7d | 2006-04-04 21:38:57 +0000 | [diff] [blame] | 15 | You should have received a copy of the GNU General Public License along |
| 16 | with Red Hat elfutils; if not, write to the Free Software Foundation, |
Ulrich Drepper | 1e9ef50 | 2006-04-04 22:29:06 +0000 | [diff] [blame] | 17 | Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA. |
Ulrich Drepper | 361df7d | 2006-04-04 21:38:57 +0000 | [diff] [blame] | 18 | |
| 19 | In addition, as a special exception, Red Hat, Inc. gives You the |
| 20 | additional right to link the code of Red Hat elfutils with code licensed |
| 21 | under any Open Source Initiative certified open source license |
| 22 | (http://www.opensource.org/licenses/index.php) which requires the |
| 23 | distribution of source code with any binary distribution and to |
| 24 | distribute linked combinations of the two. Non-GPL Code permitted under |
| 25 | this exception must only link to the code of Red Hat elfutils through |
| 26 | those well defined interfaces identified in the file named EXCEPTION |
| 27 | found in the source code files (the "Approved Interfaces"). The files |
| 28 | of Non-GPL Code may instantiate templates or use macros or inline |
| 29 | functions from the Approved Interfaces without causing the resulting |
| 30 | work to be covered by the GNU General Public License. Only Red Hat, |
| 31 | Inc. may make changes or additions to the list of Approved Interfaces. |
| 32 | Red Hat's grant of this exception is conditioned upon your not adding |
| 33 | any new exceptions. If you wish to add a new Approved Interface or |
| 34 | exception, please contact Red Hat. You must obey the GNU General Public |
| 35 | License in all respects for all of the Red Hat elfutils code and other |
| 36 | code used in conjunction with Red Hat elfutils except the Non-GPL Code |
| 37 | covered by this exception. If you modify this file, you may extend this |
| 38 | exception to your version of the file, but you are not obligated to do |
| 39 | so. If you do not wish to provide this exception without modification, |
| 40 | you must delete this exception statement from your version and license |
| 41 | this file solely under the GPL without exception. |
| 42 | |
| 43 | Red Hat elfutils is an included package of the Open Invention Network. |
| 44 | An included package of the Open Invention Network is a package for which |
| 45 | Open Invention Network licensees cross-license their patents. No patent |
| 46 | license is granted, either expressly or impliedly, by designation as an |
| 47 | included package. Should you wish to participate in the Open Invention |
| 48 | Network licensing program, please visit www.openinventionnetwork.com |
| 49 | <http://www.openinventionnetwork.com>. */ |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 50 | |
| 51 | #ifdef HAVE_CONFIG_H |
| 52 | # include <config.h> |
| 53 | #endif |
| 54 | |
| 55 | #include <assert.h> |
| 56 | #include <stdlib.h> |
| 57 | #include <string.h> |
| 58 | |
| 59 | #include "libelfP.h" |
| 60 | |
| 61 | #ifndef LIBELFBITS |
| 62 | # define LIBELFBITS 32 |
| 63 | #endif |
| 64 | |
| 65 | |
| 66 | ElfW2(LIBELFBITS,Phdr) * |
| 67 | elfw2(LIBELFBITS,newphdr) (elf, count) |
| 68 | Elf *elf; |
| 69 | size_t count; |
| 70 | { |
| 71 | ElfW2(LIBELFBITS,Phdr) *result; |
| 72 | |
| 73 | if (elf == NULL) |
| 74 | return NULL; |
| 75 | |
| 76 | if (unlikely (elf->kind != ELF_K_ELF)) |
| 77 | { |
| 78 | __libelf_seterrno (ELF_E_INVALID_HANDLE); |
| 79 | return NULL; |
| 80 | } |
| 81 | |
Roland McGrath | 6fd3cd1 | 2010-01-07 19:41:04 -0800 | [diff] [blame] | 82 | if (unlikely ((ElfW2(LIBELFBITS,Word)) count != count)) |
| 83 | { |
| 84 | __libelf_seterrno (ELF_E_INVALID_OPERAND); |
| 85 | return NULL; |
| 86 | } |
| 87 | |
Roland McGrath | b4d6f0f | 2008-08-25 22:55:17 +0000 | [diff] [blame] | 88 | rwlock_wrlock (elf->lock); |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 89 | |
| 90 | if (elf->class == 0) |
| 91 | elf->class = ELFW(ELFCLASS,LIBELFBITS); |
| 92 | else if (unlikely (elf->class != ELFW(ELFCLASS,LIBELFBITS))) |
| 93 | { |
| 94 | __libelf_seterrno (ELF_E_INVALID_CLASS); |
| 95 | result = NULL; |
| 96 | goto out; |
| 97 | } |
| 98 | |
| 99 | if (unlikely (elf->state.ELFW(elf,LIBELFBITS).ehdr == NULL)) |
| 100 | { |
| 101 | __libelf_seterrno (ELF_E_WRONG_ORDER_EHDR); |
| 102 | result = NULL; |
| 103 | goto out; |
| 104 | } |
| 105 | |
| 106 | /* A COUNT of zero means remove existing table. */ |
| 107 | if (count == 0) |
| 108 | { |
| 109 | /* Free the old program header. */ |
| 110 | if (elf->state.ELFW(elf,LIBELFBITS).phdr != NULL) |
| 111 | { |
| 112 | if (elf->state.ELFW(elf,LIBELFBITS).phdr_flags & ELF_F_MALLOCED) |
| 113 | free (elf->state.ELFW(elf,LIBELFBITS).phdr); |
| 114 | |
| 115 | /* Set the pointer to NULL. */ |
| 116 | elf->state.ELFW(elf,LIBELFBITS).phdr = NULL; |
| 117 | /* Set the `e_phnum' member to the new value. */ |
| 118 | elf->state.ELFW(elf,LIBELFBITS).ehdr->e_phnum = 0; |
Roland McGrath | 6fd3cd1 | 2010-01-07 19:41:04 -0800 | [diff] [blame] | 119 | /* Also clear any old PN_XNUM extended value. */ |
| 120 | if (elf->state.ELFW(elf,LIBELFBITS).scns.cnt > 0) |
| 121 | elf->state.ELFW(elf,LIBELFBITS).scns.data[0] |
| 122 | .shdr.ELFW(e,LIBELFBITS)->sh_info = 0; |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 123 | /* Also set the size. */ |
| 124 | elf->state.ELFW(elf,LIBELFBITS).ehdr->e_phentsize = |
| 125 | sizeof (ElfW2(LIBELFBITS,Phdr)); |
| 126 | |
| 127 | elf->state.ELFW(elf,LIBELFBITS).phdr_flags |= ELF_F_DIRTY; |
| 128 | elf->flags |= ELF_F_DIRTY; |
| 129 | __libelf_seterrno (ELF_E_NOERROR); |
| 130 | } |
| 131 | |
| 132 | result = NULL; |
| 133 | } |
| 134 | else if (elf->state.ELFW(elf,LIBELFBITS).ehdr->e_phnum != count |
Roland McGrath | 6fd3cd1 | 2010-01-07 19:41:04 -0800 | [diff] [blame] | 135 | || count == PN_XNUM |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 136 | || elf->state.ELFW(elf,LIBELFBITS).phdr == NULL) |
| 137 | { |
| 138 | /* Allocate a new program header with the appropriate number of |
| 139 | elements. */ |
| 140 | result = (ElfW2(LIBELFBITS,Phdr) *) |
| 141 | realloc (elf->state.ELFW(elf,LIBELFBITS).phdr, |
| 142 | count * sizeof (ElfW2(LIBELFBITS,Phdr))); |
| 143 | if (result == NULL) |
| 144 | __libelf_seterrno (ELF_E_NOMEM); |
| 145 | else |
| 146 | { |
| 147 | /* Now set the result. */ |
| 148 | elf->state.ELFW(elf,LIBELFBITS).phdr = result; |
Roland McGrath | 6fd3cd1 | 2010-01-07 19:41:04 -0800 | [diff] [blame] | 149 | if (count >= PN_XNUM) |
| 150 | { |
| 151 | /* We have to write COUNT into the zeroth section's sh_info. */ |
| 152 | Elf_Scn *scn0 = &elf->state.ELFW(elf,LIBELFBITS).scns.data[0]; |
| 153 | if (elf->state.ELFW(elf,LIBELFBITS).scns.cnt == 0) |
| 154 | { |
| 155 | assert (elf->state.ELFW(elf,LIBELFBITS).scns.max > 0); |
| 156 | elf->state.ELFW(elf,LIBELFBITS).scns.cnt = 1; |
| 157 | } |
| 158 | scn0->shdr.ELFW(e,LIBELFBITS)->sh_info = count; |
| 159 | scn0->shdr_flags |= ELF_F_DIRTY; |
| 160 | elf->state.ELFW(elf,LIBELFBITS).ehdr->e_phnum = PN_XNUM; |
| 161 | } |
| 162 | else |
| 163 | /* Set the `e_phnum' member to the new value. */ |
| 164 | elf->state.ELFW(elf,LIBELFBITS).ehdr->e_phnum = count; |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 165 | /* Clear the whole memory. */ |
| 166 | memset (result, '\0', count * sizeof (ElfW2(LIBELFBITS,Phdr))); |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 167 | /* Also set the size. */ |
| 168 | elf->state.ELFW(elf,LIBELFBITS).ehdr->e_phentsize = |
| 169 | elf_typesize (LIBELFBITS, ELF_T_PHDR, 1); |
| 170 | /* Remember we allocated the array and mark the structure is |
| 171 | modified. */ |
| 172 | elf->state.ELFW(elf,LIBELFBITS).phdr_flags |= |
| 173 | ELF_F_DIRTY | ELF_F_MALLOCED; |
| 174 | /* We have to rewrite the entire file if the size of the |
| 175 | program header is changed. */ |
| 176 | elf->flags |= ELF_F_DIRTY; |
| 177 | } |
| 178 | } |
| 179 | else |
| 180 | { |
| 181 | /* We have the same number of entries. Just clear the array. */ |
| 182 | assert (elf->state.ELFW(elf,LIBELFBITS).ehdr->e_phentsize |
| 183 | == elf_typesize (LIBELFBITS, ELF_T_PHDR, 1)); |
| 184 | |
| 185 | /* Mark the structure as modified. */ |
| 186 | elf->state.ELFW(elf,LIBELFBITS).phdr_flags |= ELF_F_DIRTY; |
| 187 | |
| 188 | result = elf->state.ELFW(elf,LIBELFBITS).phdr; |
Roland McGrath | 6fd3cd1 | 2010-01-07 19:41:04 -0800 | [diff] [blame] | 189 | memset (result, '\0', count * sizeof (ElfW2(LIBELFBITS,Phdr))); |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 190 | } |
| 191 | |
| 192 | out: |
Roland McGrath | b4d6f0f | 2008-08-25 22:55:17 +0000 | [diff] [blame] | 193 | rwlock_unlock (elf->lock); |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 194 | |
| 195 | return result; |
| 196 | } |
| 197 | INTDEF(elfw2(LIBELFBITS,newphdr)) |