1/* Update program header program header table entry.
2   Copyright (C) 2000, 2001, 2002 Red Hat, Inc.
3   This file is part of Red Hat elfutils.
4   Written by Ulrich Drepper <drepper@redhat.com>, 2000.
5
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.
9
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.
14
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,
17   Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA.
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>.  */
50
51#ifdef HAVE_CONFIG_H
52# include <config.h>
53#endif
54
55#include <gelf.h>
56#include <string.h>
57
58#include "libelfP.h"
59
60
61int
62gelf_update_phdr (Elf *elf, int ndx, GElf_Phdr *src)
63{
64  int result = 0;
65
66  if (elf == NULL)
67    return 0;
68
69  if (unlikely (elf->kind != ELF_K_ELF))
70    {
71      __libelf_seterrno (ELF_E_INVALID_HANDLE);
72      return 0;
73    }
74
75  rwlock_wrlock (elf->lock);
76
77  if (elf->class == ELFCLASS32)
78    {
79      Elf32_Phdr *phdr = elf->state.elf32.phdr;
80
81      /* We have to convert the data to the 32 bit format.  This might
82	 overflow some fields so we have to test for this case before
83	 copying.  */
84      if (unlikely (src->p_offset > 0xffffffffull)
85	  || unlikely (src->p_vaddr > 0xffffffffull)
86	  || unlikely (src->p_paddr > 0xffffffffull)
87	  || unlikely (src->p_filesz > 0xffffffffull)
88	  || unlikely (src->p_memsz > 0xffffffffull)
89	  || unlikely (src->p_align > 0xffffffffull))
90	{
91	  __libelf_seterrno (ELF_E_INVALID_DATA);
92	  goto out;
93	}
94
95      if (phdr == NULL)
96	{
97	  phdr = __elf32_getphdr_wrlock (elf);
98	  if (phdr == NULL)
99	    /* The error number is already set.  */
100	    goto out;
101	}
102
103      /* Test whether the index is ok.  */
104      if (unlikely (ndx >= elf->state.elf32.ehdr->e_phnum))
105	{
106	  __libelf_seterrno (ELF_E_INVALID_INDEX);
107	  goto out;
108	}
109
110      /* Now correct the pointer to point to the correct element.  */
111      phdr += ndx;
112
113#define COPY(name) \
114      phdr->name = src->name
115      COPY (p_type);
116      COPY (p_offset);
117      COPY (p_vaddr);
118      COPY (p_paddr);
119      COPY (p_filesz);
120      COPY (p_memsz);
121      COPY (p_flags);
122      COPY (p_align);
123    }
124  else
125    {
126      Elf64_Phdr *phdr = elf->state.elf64.phdr;
127
128      if (phdr == NULL)
129	{
130	  phdr = __elf64_getphdr_wrlock (elf);
131	  if (phdr == NULL)
132	    /* The error number is already set.  */
133	    goto out;
134	}
135
136      /* Test whether the index is ok.  */
137      if (unlikely (ndx >= elf->state.elf64.ehdr->e_phnum))
138	{
139	  __libelf_seterrno (ELF_E_INVALID_INDEX);
140	  goto out;
141	}
142
143      /* Just copy the data.  */
144      memcpy (phdr + ndx, src, sizeof (Elf64_Phdr));
145    }
146
147  result = 1;
148
149 out:
150  rwlock_unlock (elf->lock);
151
152  return result;
153}
154