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Diffstat (limited to 'libelf/gelf_update_sym.c')
-rw-r--r--libelf/gelf_update_sym.c113
1 files changed, 113 insertions, 0 deletions
diff --git a/libelf/gelf_update_sym.c b/libelf/gelf_update_sym.c
new file mode 100644
index 00000000..8fc7dd66
--- /dev/null
+++ b/libelf/gelf_update_sym.c
@@ -0,0 +1,113 @@
+/* Update symbol information in symbol table at the given index.
+ Copyright (C) 2000, 2001, 2002 Red Hat, Inc.
+ Written by Ulrich Drepper <drepper@redhat.com>, 2000.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, version 2.
+
+ This program 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 a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software Foundation,
+ Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <gelf.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "libelfP.h"
+
+
+int
+gelf_update_sym (data, ndx, src)
+ Elf_Data *data;
+ int ndx;
+ GElf_Sym *src;
+{
+ Elf_Data_Scn *data_scn = (Elf_Data_Scn *) data;
+ Elf_Scn *scn;
+ int result = 0;
+
+ if (data == NULL)
+ return 0;
+
+ if (unlikely (ndx < 0))
+ {
+ __libelf_seterrno (ELF_E_INVALID_INDEX);
+ return 0;
+ }
+
+ if (unlikely (data_scn->d.d_type != ELF_T_SYM))
+ {
+ /* The type of the data better should match. */
+ __libelf_seterrno (ELF_E_DATA_MISMATCH);
+ return 0;
+ }
+
+ scn = data_scn->s;
+ rwlock_wrlock (scn->elf->lock);
+
+ if (scn->elf->class == ELFCLASS32)
+ {
+ Elf32_Sym *sym;
+
+ /* There is the possibility that the values in the input are
+ too large. */
+ if (unlikely (src->st_value > 0xffffffffull)
+ || unlikely (src->st_size > 0xffffffffull))
+ {
+ __libelf_seterrno (ELF_E_INVALID_DATA);
+ goto out;
+ }
+
+ /* Check whether we have to resize the data buffer. */
+ if (unlikely ((ndx + 1) * sizeof (Elf32_Sym) > data_scn->d.d_size))
+ {
+ __libelf_seterrno (ELF_E_INVALID_INDEX);
+ goto out;
+ }
+
+ sym = &((Elf32_Sym *) data_scn->d.d_buf)[ndx];
+
+#define COPY(name) \
+ sym->name = src->name
+ COPY (st_name);
+ COPY (st_value);
+ COPY (st_size);
+ /* Please note that we can simply copy the `st_info' element since
+ the definitions of ELFxx_ST_BIND and ELFxx_ST_TYPE are the same
+ for the 64 bit variant. */
+ COPY (st_info);
+ COPY (st_other);
+ COPY (st_shndx);
+ }
+ else
+ {
+ /* Check whether we have to resize the data buffer. */
+ if (unlikely ((ndx + 1) * sizeof (Elf64_Sym) > data_scn->d.d_size))
+ {
+ __libelf_seterrno (ELF_E_INVALID_INDEX);
+ goto out;
+ }
+
+ ((Elf64_Sym *) data_scn->d.d_buf)[ndx] = *src;
+ }
+
+ result = 1;
+
+ /* Mark the section as modified. */
+ scn->flags |= ELF_F_DIRTY;
+
+ out:
+ rwlock_unlock (scn->elf->lock);
+
+ return result;
+}