1/* Read all of the file associated with the descriptor.
2   Copyright (C) 1998-2009 Red Hat, Inc.
3   This file is part of Red Hat elfutils.
4   Contributed by Ulrich Drepper <drepper@redhat.com>, 1998.
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 <errno.h>
56#include <unistd.h>
57#include <sys/stat.h>
58
59#include <system.h>
60#include "libelfP.h"
61#include "common.h"
62
63
64static void
65set_address (Elf *elf, size_t offset)
66{
67  if (elf->kind == ELF_K_AR)
68    {
69      Elf *child = elf->state.ar.children;
70
71      while (child != NULL)
72	{
73	  if (child->map_address == NULL)
74	    {
75	      child->map_address = elf->map_address;
76	      child->start_offset -= offset;
77	      if (child->kind == ELF_K_AR)
78		child->state.ar.offset -= offset;
79
80	      set_address (child, offset);
81	    }
82
83	  child = child->next;
84	}
85    }
86}
87
88
89char *
90__libelf_readall (elf)
91     Elf *elf;
92{
93  /* Get the file.  */
94  rwlock_wrlock (elf->lock);
95
96  if (elf->map_address == NULL && unlikely (elf->fildes == -1))
97    {
98      __libelf_seterrno (ELF_E_INVALID_HANDLE);
99      rwlock_unlock (elf->lock);
100      return NULL;
101    }
102
103  /* If the file is not mmap'ed and not previously loaded, do it now.  */
104  if (elf->map_address == NULL)
105    {
106      char *mem = NULL;
107
108      /* If this is an archive and we have derived descriptors get the
109	 locks for all of them.  */
110      libelf_acquire_all (elf);
111
112      if (elf->maximum_size == ~((size_t) 0))
113	{
114	  /* We don't yet know how large the file is.   Determine that now.  */
115	  struct stat st;
116
117	  if (fstat (elf->fildes, &st) < 0)
118	    goto read_error;
119
120	  if (sizeof (size_t) >= sizeof (st.st_size)
121	      || st.st_size <= ~((size_t) 0))
122	    elf->maximum_size = (size_t) st.st_size;
123	  else
124	    {
125	      errno = EOVERFLOW;
126	      goto read_error;
127	    }
128	}
129
130      /* Allocate all the memory we need.  */
131      mem = (char *) malloc (elf->maximum_size);
132      if (mem != NULL)
133	{
134	  /* Read the file content.  */
135	  if (unlikely ((size_t) pread_retry (elf->fildes, mem,
136					      elf->maximum_size,
137					      elf->start_offset)
138			!= elf->maximum_size))
139	    {
140	      /* Something went wrong.  */
141	    read_error:
142	      __libelf_seterrno (ELF_E_READ_ERROR);
143	      free (mem);
144	    }
145	  else
146	    {
147	      /* Remember the address.  */
148	      elf->map_address = mem;
149
150	      /* Also remember that we allocated the memory.  */
151	      elf->flags |= ELF_F_MALLOCED;
152
153	      /* Propagate the information down to all children and
154		 their children.  */
155	      set_address (elf, elf->start_offset);
156
157	      /* Correct the own offsets.  */
158	      if (elf->kind == ELF_K_AR)
159		elf->state.ar.offset -= elf->start_offset;
160	      elf->start_offset = 0;
161	    }
162	}
163      else
164	__libelf_seterrno (ELF_E_NOMEM);
165
166      /* Free the locks on the children.  */
167      libelf_release_all (elf);
168    }
169
170  rwlock_unlock (elf->lock);
171
172  return (char *) elf->map_address;
173}
174