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_getdyn.c b/libelf/gelf_getdyn.c
new file mode 100644
index 0000000..a0090e1
--- /dev/null
+++ b/libelf/gelf_getdyn.c
@@ -0,0 +1,108 @@
+/* Get information from dynamic table at the given index.
+ Copyright (C) 2000, 2001, 2002, 2005, 2009, 2014, 2015 Red Hat, Inc.
+ This file is part of elfutils.
+ Written by Ulrich Drepper <drepper@redhat.com>, 2000.
+
+ 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_Dyn *
+gelf_getdyn (Elf_Data *data, int ndx, GElf_Dyn *dst)
+{
+ Elf_Data_Scn *data_scn = (Elf_Data_Scn *) data;
+ GElf_Dyn *result = NULL;
+ Elf *elf;
+
+ if (data_scn == NULL)
+ return NULL;
+
+ if (unlikely (data_scn->d.d_type != ELF_T_DYN))
+ {
+ __libelf_seterrno (ELF_E_INVALID_HANDLE);
+ return NULL;
+ }
+
+ elf = data_scn->s->elf;
+
+ rwlock_rdlock (elf->lock);
+
+ /* This is the one place where we have to take advantage of the fact
+ that an `Elf_Data' pointer is also a pointer to `Elf_Data_Scn'.
+ The interface is broken so that it requires this hack. */
+ if (elf->class == ELFCLASS32)
+ {
+ Elf32_Dyn *src;
+
+ /* Here it gets a bit more complicated. The format of the symbol
+ table entries has to be adopted. The user better has provided
+ a buffer where we can store the information. While copying the
+ data we are converting the format. */
+ if (INVALID_NDX (ndx, Elf32_Dyn, &data_scn->d))
+ {
+ __libelf_seterrno (ELF_E_INVALID_INDEX);
+ goto out;
+ }
+
+ src = &((Elf32_Dyn *) data_scn->d.d_buf)[ndx];
+
+ /* This might look like a simple copy operation but it's
+ not. There are zero- and sign-extensions going on. */
+ dst->d_tag = src->d_tag;
+ /* It OK to copy `d_val' since `d_ptr' has the same size. */
+ dst->d_un.d_val = src->d_un.d_val;
+ }
+ else
+ {
+ /* If this is a 64 bit object it's easy. */
+ assert (sizeof (GElf_Dyn) == sizeof (Elf64_Dyn));
+
+ /* The data is already in the correct form. Just make sure the
+ index is OK. */
+ if (INVALID_NDX (ndx, GElf_Dyn, &data_scn->d))
+ {
+ __libelf_seterrno (ELF_E_INVALID_INDEX);
+ goto out;
+ }
+
+ *dst = ((GElf_Dyn *) data_scn->d.d_buf)[ndx];
+ }
+
+ result = dst;
+
+ out:
+ rwlock_unlock (elf->lock);
+
+ return result;
+}