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/elf32_getehdr.c b/libelf/elf32_getehdr.c
new file mode 100644
index 0000000..89e3c40
--- /dev/null
+++ b/libelf/elf32_getehdr.c
@@ -0,0 +1,96 @@
+/* Get ELF header.
+ Copyright (C) 1998, 1999, 2000, 2002, 2015 Red Hat, Inc.
+ This file is part of elfutils.
+ Written by Ulrich Drepper <drepper@redhat.com>, 1998.
+
+ 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 <libelf.h>
+#include <stddef.h>
+
+#include "libelfP.h"
+
+#ifndef LIBELFBITS
+# define LIBELFBITS 32
+#endif
+
+
+static ElfW2(LIBELFBITS,Ehdr) *
+getehdr_impl (Elf *elf, int wrlock)
+{
+ if (elf == NULL)
+ return NULL;
+
+ if (unlikely (elf->kind != ELF_K_ELF))
+ {
+ __libelf_seterrno (ELF_E_INVALID_HANDLE);
+ return NULL;
+ }
+
+ again:
+ if (elf->class == 0)
+ {
+ if (!wrlock)
+ {
+ rwlock_unlock (elf->lock);
+ rwlock_wrlock (elf->lock);
+ wrlock = 1;
+ goto again;
+ }
+ elf->class = ELFW(ELFCLASS,LIBELFBITS);
+ }
+ else if (unlikely (elf->class != ELFW(ELFCLASS,LIBELFBITS)))
+ {
+ __libelf_seterrno (ELF_E_INVALID_CLASS);
+ return NULL;
+ }
+
+ return elf->state.ELFW(elf,LIBELFBITS).ehdr;
+}
+
+ElfW2(LIBELFBITS,Ehdr) *
+internal_function
+__elfw2(LIBELFBITS,getehdr_wrlock) (Elf *elf)
+{
+ return getehdr_impl (elf, 1);
+}
+
+ElfW2(LIBELFBITS,Ehdr) *
+elfw2(LIBELFBITS,getehdr) (Elf *elf)
+{
+ ElfW2(LIBELFBITS,Ehdr) *result;
+ if (elf == NULL)
+ return NULL;
+
+ rwlock_rdlock (elf->lock);
+ result = getehdr_impl (elf, 0);
+ rwlock_unlock (elf->lock);
+
+ return result;
+}