Squashed 'third_party/elfutils/' content from commit 555e15e
Change-Id: I61cde98949e47e5c8c09c33260de17f30921be79
git-subtree-dir: third_party/elfutils
git-subtree-split: 555e15ebe8bf1eb33d00747173cfc80cc65648a4
diff --git a/libelf/gelf_getvernaux.c b/libelf/gelf_getvernaux.c
new file mode 100644
index 0000000..e47fb0a
--- /dev/null
+++ b/libelf/gelf_getvernaux.c
@@ -0,0 +1,81 @@
+/* Get additional required symbol version information at the given offset.
+ Copyright (C) 1999, 2000, 2001, 2002, 2015 Red Hat, Inc.
+ This file is part of elfutils.
+ Written by Ulrich Drepper <drepper@redhat.com>, 1999.
+
+ This file is free software; you can redistribute it and/or modify
+ it under the terms of either
+
+ * the GNU Lesser General Public License as published by the Free
+ Software Foundation; either version 3 of the License, or (at
+ your option) any later version
+
+ or
+
+ * the GNU General Public License as published by the Free
+ Software Foundation; either version 2 of the License, or (at
+ your option) any later version
+
+ or both in parallel, as here.
+
+ elfutils is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received copies of the GNU General Public License and
+ the GNU Lesser General Public License along with this program. If
+ not, see <http://www.gnu.org/licenses/>. */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <assert.h>
+#include <gelf.h>
+#include <string.h>
+
+#include "libelfP.h"
+
+
+GElf_Vernaux *
+gelf_getvernaux (Elf_Data *data, int offset, GElf_Vernaux *dst)
+{
+ GElf_Vernaux *result;
+
+ if (data == NULL)
+ return NULL;
+
+ if (unlikely (data->d_type != ELF_T_VNEED))
+ {
+ __libelf_seterrno (ELF_E_INVALID_HANDLE);
+ return NULL;
+ }
+
+ /* It's easy to handle this type. It has the same size for 32 and
+ 64 bit objects. And fortunately the `ElfXXX_Vernaux' records
+ also have the same size. */
+ assert (sizeof (GElf_Vernaux) == sizeof (Elf32_Verneed));
+ assert (sizeof (GElf_Vernaux) == sizeof (Elf64_Verneed));
+ assert (sizeof (GElf_Vernaux) == sizeof (Elf32_Vernaux));
+ assert (sizeof (GElf_Vernaux) == sizeof (Elf64_Vernaux));
+
+ rwlock_rdlock (((Elf_Data_Scn *) data)->s->elf->lock);
+
+ /* The data is already in the correct form. Just make sure the
+ index is OK. */
+ if (unlikely (offset < 0)
+ || unlikely (offset + sizeof (GElf_Vernaux) > data->d_size)
+ || unlikely (offset % sizeof (GElf_Vernaux) != 0))
+ {
+ __libelf_seterrno (ELF_E_OFFSET_RANGE);
+ result = NULL;
+ }
+ else
+ result = (GElf_Vernaux *) memcpy (dst, (char *) data->d_buf + offset,
+ sizeof (GElf_Verneed));
+
+ rwlock_unlock (((Elf_Data_Scn *) data)->s->elf->lock);
+
+ return result;
+}