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_offscn.c b/libelf/elf32_offscn.c
new file mode 100644
index 0000000..9e757c8
--- /dev/null
+++ b/libelf/elf32_offscn.c
@@ -0,0 +1,99 @@
+/* Get section at specific index.
+ Copyright (C) 2005, 2008, 2015 Red Hat, Inc.
+ This file is part of elfutils.
+ Contributed by Ulrich Drepper <drepper@redhat.com>, 2005.
+
+ 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 <stddef.h>
+#include <stdlib.h>
+
+#include "libelfP.h"
+
+#ifndef LIBELFBITS
+# define LIBELFBITS 32
+#endif
+
+
+Elf_Scn *
+elfw2(LIBELFBITS,offscn) (Elf *elf, ElfW2(LIBELFBITS,Off) offset)
+{
+ if (elf == NULL)
+ return NULL;
+
+ if (unlikely (elf->kind != ELF_K_ELF))
+ {
+ __libelf_seterrno (ELF_E_INVALID_HANDLE);
+ return NULL;
+ }
+
+ Elf_ScnList *runp = &elf->state.ELFW(elf,LIBELFBITS).scns;
+
+ /* If we have not looked at section headers before,
+ we might need to read them in first. */
+ if (runp->cnt > 0
+ && unlikely (runp->data[0].shdr.ELFW(e,LIBELFBITS) == NULL)
+ && unlikely (elfw2(LIBELFBITS,getshdr) (&runp->data[0]) == NULL))
+ return NULL;
+
+ rwlock_rdlock (elf->lock);
+
+ Elf_Scn *result = NULL;
+
+ /* Find the section in the list. */
+ while (1)
+ {
+ for (unsigned int i = 0; i < runp->cnt; ++i)
+ if (runp->data[i].shdr.ELFW(e,LIBELFBITS)->sh_offset == offset)
+ {
+ result = &runp->data[i];
+
+ /* If this section is empty, the following one has the same
+ sh_offset. We presume the caller is looking for a nonempty
+ section, so keep looking if this one is empty. */
+ if (runp->data[i].shdr.ELFW(e,LIBELFBITS)->sh_size != 0
+ && runp->data[i].shdr.ELFW(e,LIBELFBITS)->sh_type != SHT_NOBITS)
+ goto out;
+ }
+
+ runp = runp->next;
+ if (runp == NULL)
+ {
+ __libelf_seterrno (ELF_E_INVALID_OFFSET);
+ break;
+ }
+ }
+
+ out:
+ rwlock_unlock (elf->lock);
+
+ return result;
+}
+INTDEF(elfw2(LIBELFBITS,offscn))