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/elf_readall.c b/libelf/elf_readall.c
new file mode 100644
index 0000000..384d251
--- /dev/null
+++ b/libelf/elf_readall.c
@@ -0,0 +1,152 @@
+/* Read all of the file associated with the descriptor.
+ Copyright (C) 1998-2009, 2015 Red Hat, Inc.
+ This file is part of elfutils.
+ Contributed 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 <errno.h>
+#include <unistd.h>
+#include <sys/stat.h>
+
+#include <system.h>
+#include "libelfP.h"
+#include "common.h"
+
+
+static void
+set_address (Elf *elf, size_t offset)
+{
+ if (elf->kind == ELF_K_AR)
+ {
+ Elf *child = elf->state.ar.children;
+
+ while (child != NULL)
+ {
+ if (child->map_address == NULL)
+ {
+ child->map_address = elf->map_address;
+ child->start_offset -= offset;
+ if (child->kind == ELF_K_AR)
+ child->state.ar.offset -= offset;
+
+ set_address (child, offset);
+ }
+
+ child = child->next;
+ }
+ }
+}
+
+
+char *
+internal_function
+__libelf_readall (Elf *elf)
+{
+ /* Get the file. */
+ rwlock_wrlock (elf->lock);
+
+ if (elf->map_address == NULL && unlikely (elf->fildes == -1))
+ {
+ __libelf_seterrno (ELF_E_INVALID_HANDLE);
+ rwlock_unlock (elf->lock);
+ return NULL;
+ }
+
+ /* If the file is not mmap'ed and not previously loaded, do it now. */
+ if (elf->map_address == NULL)
+ {
+ char *mem = NULL;
+
+ /* If this is an archive and we have derived descriptors get the
+ locks for all of them. */
+ libelf_acquire_all (elf);
+
+ if (elf->maximum_size == ~((size_t) 0))
+ {
+ /* We don't yet know how large the file is. Determine that now. */
+ struct stat st;
+
+ if (fstat (elf->fildes, &st) < 0)
+ goto read_error;
+
+ if (sizeof (size_t) >= sizeof (st.st_size)
+ || st.st_size <= ~((size_t) 0))
+ elf->maximum_size = (size_t) st.st_size;
+ else
+ {
+ errno = EOVERFLOW;
+ goto read_error;
+ }
+ }
+
+ /* Allocate all the memory we need. */
+ mem = (char *) malloc (elf->maximum_size);
+ if (mem != NULL)
+ {
+ /* Read the file content. */
+ if (unlikely ((size_t) pread_retry (elf->fildes, mem,
+ elf->maximum_size,
+ elf->start_offset)
+ != elf->maximum_size))
+ {
+ /* Something went wrong. */
+ read_error:
+ __libelf_seterrno (ELF_E_READ_ERROR);
+ free (mem);
+ }
+ else
+ {
+ /* Remember the address. */
+ elf->map_address = mem;
+
+ /* Also remember that we allocated the memory. */
+ elf->flags |= ELF_F_MALLOCED;
+
+ /* Propagate the information down to all children and
+ their children. */
+ set_address (elf, elf->start_offset);
+
+ /* Correct the own offsets. */
+ if (elf->kind == ELF_K_AR)
+ elf->state.ar.offset -= elf->start_offset;
+ elf->start_offset = 0;
+ }
+ }
+ else
+ __libelf_seterrno (ELF_E_NOMEM);
+
+ /* Free the locks on the children. */
+ libelf_release_all (elf);
+ }
+
+ rwlock_unlock (elf->lock);
+
+ return (char *) elf->map_address;
+}