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_newscn.c b/libelf/elf_newscn.c
new file mode 100644
index 0000000..d15a642
--- /dev/null
+++ b/libelf/elf_newscn.c
@@ -0,0 +1,162 @@
+/* Append new section.
+ Copyright (C) 1998,1999,2000,2001,2002,2005,2009,2014,2015 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 <assert.h>
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "libelfP.h"
+
+
+Elf_Scn *
+elf_newscn (Elf *elf)
+{
+ Elf_Scn *result = NULL;
+ bool first = false;
+
+ if (elf == NULL)
+ return NULL;
+
+ /* We rely on the prefix of the `elf', `elf32', and `elf64' element
+ being the same. */
+ assert (offsetof (Elf, state.elf.scns_last)
+ == offsetof (Elf, state.elf32.scns_last));
+ assert (offsetof (Elf, state.elf.scns_last)
+ == offsetof (Elf, state.elf64.scns_last));
+ assert (offsetof (Elf, state.elf32.scns)
+ == offsetof (Elf, state.elf64.scns));
+
+ rwlock_wrlock (elf->lock);
+
+ again:
+ if (elf->state.elf.scns_last->cnt < elf->state.elf.scns_last->max)
+ {
+ result = &elf->state.elf.scns_last->data[elf->state.elf.scns_last->cnt];
+
+ if (++elf->state.elf.scns_last->cnt == 1
+ && (elf->state.elf.scns_last
+ == (elf->class == ELFCLASS32
+ || (offsetof (Elf, state.elf32.scns)
+ == offsetof (Elf, state.elf64.scns))
+ ? &elf->state.elf32.scns : &elf->state.elf64.scns)))
+ /* This is zeroth section. */
+ first = true;
+ else
+ {
+ assert (elf->state.elf.scns_last->cnt > 1);
+ result->index = result[-1].index + 1;
+ }
+ }
+ else
+ {
+ /* We must allocate a new element. */
+ Elf_ScnList *newp = NULL;
+
+ assert (elf->state.elf.scnincr > 0);
+
+ if (
+#if SIZE_MAX <= 4294967295U
+ likely (elf->state.elf.scnincr
+ < SIZE_MAX / 2 / sizeof (Elf_Scn) - sizeof (Elf_ScnList))
+#else
+ 1
+#endif
+ )
+ newp = (Elf_ScnList *) calloc (sizeof (Elf_ScnList)
+ + ((elf->state.elf.scnincr *= 2)
+ * sizeof (Elf_Scn)), 1);
+ if (newp == NULL)
+ {
+ __libelf_seterrno (ELF_E_NOMEM);
+ goto out;
+ }
+
+ result = &newp->data[0];
+
+ /* One section used. */
+ ++newp->cnt;
+
+ /* This is the number of sections we allocated. */
+ newp->max = elf->state.elf.scnincr;
+
+ /* Remember the index for the first section in this block. */
+ newp->data[0].index
+ = 1 + elf->state.elf.scns_last->data[elf->state.elf.scns_last->max - 1].index;
+
+ /* Enqueue the new list element. */
+ elf->state.elf.scns_last = elf->state.elf.scns_last->next = newp;
+ }
+
+ /* Create a section header for this section. */
+ if (elf->class == ELFCLASS32)
+ {
+ result->shdr.e32 = (Elf32_Shdr *) calloc (1, sizeof (Elf32_Shdr));
+ if (result->shdr.e32 == NULL)
+ {
+ __libelf_seterrno (ELF_E_NOMEM);
+ goto out;
+ }
+ }
+ else
+ {
+ result->shdr.e64 = (Elf64_Shdr *) calloc (1, sizeof (Elf64_Shdr));
+ if (result->shdr.e64 == NULL)
+ {
+ __libelf_seterrno (ELF_E_NOMEM);
+ goto out;
+ }
+ }
+
+ result->elf = elf;
+ result->shdr_flags = ELF_F_DIRTY | ELF_F_MALLOCED;
+ result->list = elf->state.elf.scns_last;
+
+ /* Initialize the data part. */
+ result->data_read = 1;
+ if (unlikely (first))
+ {
+ /* For the first section we mark the data as already available. */
+ //result->data_list_rear = &result->data_list;
+ first = false;
+ goto again;
+ }
+
+ result->flags |= ELF_F_DIRTY;
+
+ out:
+ rwlock_unlock (elf->lock);
+
+ return result;
+}