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_getrel.c b/libelf/gelf_getrel.c
new file mode 100644
index 0000000..309e3d3
--- /dev/null
+++ b/libelf/gelf_getrel.c
@@ -0,0 +1,99 @@
+/* Get REL relocation information at 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 <gelf.h>
+#include <string.h>
+
+#include "libelfP.h"
+
+
+GElf_Rel *
+gelf_getrel (Elf_Data *data, int ndx, GElf_Rel *dst)
+{
+ Elf_Data_Scn *data_scn = (Elf_Data_Scn *) data;
+ Elf_Scn *scn;
+ GElf_Rel *result;
+
+ if (data_scn == NULL)
+ return NULL;
+
+ if (unlikely (data_scn->d.d_type != ELF_T_REL))
+ {
+ __libelf_seterrno (ELF_E_INVALID_HANDLE);
+ return NULL;
+ }
+
+ /* 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. */
+ scn = data_scn->s;
+
+ rwlock_rdlock (scn->elf->lock);
+
+ if (scn->elf->class == ELFCLASS32)
+ {
+ /* We have to convert the data. */
+ if (INVALID_NDX (ndx, Elf32_Rel, &data_scn->d))
+ {
+ __libelf_seterrno (ELF_E_INVALID_INDEX);
+ result = NULL;
+ }
+ else
+ {
+ Elf32_Rel *src = &((Elf32_Rel *) data_scn->d.d_buf)[ndx];
+
+ dst->r_offset = src->r_offset;
+ dst->r_info = GELF_R_INFO (ELF32_R_SYM (src->r_info),
+ ELF32_R_TYPE (src->r_info));
+
+ result = dst;
+ }
+ }
+ else
+ {
+ /* Simply copy the data after we made sure we are actually getting
+ correct data. */
+ if (INVALID_NDX (ndx, Elf64_Rel, &data_scn->d))
+ {
+ __libelf_seterrno (ELF_E_INVALID_INDEX);
+ result = NULL;
+ }
+ else
+ result = memcpy (dst, &((Elf64_Rel *) data_scn->d.d_buf)[ndx],
+ sizeof (Elf64_Rel));
+ }
+
+ rwlock_unlock (scn->elf->lock);
+
+ return result;
+}