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_getehdr.c b/libelf/gelf_getehdr.c
new file mode 100644
index 0000000..abeb70c
--- /dev/null
+++ b/libelf/gelf_getehdr.c
@@ -0,0 +1,108 @@
+/* Get ELF header.
+ Copyright (C) 1998, 1999, 2000, 2001, 2002, 2005, 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 <gelf.h>
+#include <stddef.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "libelfP.h"
+
+
+GElf_Ehdr *
+internal_function
+__gelf_getehdr_rdlock (Elf *elf, GElf_Ehdr *dest)
+{
+ GElf_Ehdr *result = NULL;
+
+ if (elf == NULL)
+ return NULL;
+
+ if (unlikely (elf->kind != ELF_K_ELF))
+ {
+ __libelf_seterrno (ELF_E_INVALID_HANDLE);
+ return NULL;
+ }
+
+ /* The following is an optimization: the ehdr element is at the same
+ position in both the elf32 and elf64 structure. */
+ if (offsetof (struct Elf, state.elf32.ehdr)
+ != offsetof (struct Elf, state.elf64.ehdr))
+ abort ();
+ /* Just pick one of the values. */
+ if (unlikely (elf->state.elf64.ehdr == NULL))
+ /* Maybe no ELF header was created yet. */
+ __libelf_seterrno (ELF_E_WRONG_ORDER_EHDR);
+ else if (elf->class == ELFCLASS32)
+ {
+ Elf32_Ehdr *ehdr = elf->state.elf32.ehdr;
+
+ /* Convert the 32-bit struct to an 64-bit one. */
+ memcpy (dest->e_ident, ehdr->e_ident, EI_NIDENT);
+#define COPY(name) \
+ dest->name = ehdr->name
+ COPY (e_type);
+ COPY (e_machine);
+ COPY (e_version);
+ COPY (e_entry);
+ COPY (e_phoff);
+ COPY (e_shoff);
+ COPY (e_flags);
+ COPY (e_ehsize);
+ COPY (e_phentsize);
+ COPY (e_phnum);
+ COPY (e_shentsize);
+ COPY (e_shnum);
+ COPY (e_shstrndx);
+
+ result = dest;
+ }
+ else
+ result = memcpy (dest, elf->state.elf64.ehdr, sizeof (*dest));
+
+ return result;
+}
+
+GElf_Ehdr *
+gelf_getehdr (Elf *elf, GElf_Ehdr *dest)
+{
+ GElf_Ehdr *result;
+ if (elf == NULL)
+ return NULL;
+
+ rwlock_rdlock (elf->lock);
+ result = __gelf_getehdr_rdlock (elf, dest);
+ rwlock_unlock (elf->lock);
+
+ return result;
+}