auto import from //depot/cupcake/@135843

1 files changed, 97 insertions, 0 deletions

diff --git a/libelf/gelf_getrela.c b/libelf/gelf_getrela.c
new file mode 100644
index 00000000..fb94b008
--- /dev/null
+++ b/libelf/gelf_getrela.c
@@ -0,0 +1,97 @@
+/* Get RELA relocation information at 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 <string.h>
+
+#include "libelfP.h"
+
+
+GElf_Rela *
+gelf_getrela (data, ndx, dst)
+     Elf_Data *data;
+     int ndx;
+     GElf_Rela *dst;
+{
+  Elf_Data_Scn *data_scn = (Elf_Data_Scn *) data;
+  Elf_Scn *scn;
+  GElf_Rela *result;
+
+  if (data_scn == NULL)
+    return NULL;
+
+  if (unlikely (ndx < 0))
+    {
+      __libelf_seterrno (ELF_E_INVALID_INDEX);
+      return NULL;
+    }
+
+  if (unlikely (data_scn->d.d_type != ELF_T_RELA))
+    {
+      __libelf_seterrno (ELF_E_INVALID_HANDLE);
+      return NULL;
+    }
+
+  /* This is the one place where we have to take advantage of the fact
+     that an `Elf_Data' pointer is also a pointer to `Elf_Data_Scn'.
+     The interface is broken so that it requires this hack.  */
+  scn = data_scn->s;
+
+  rwlock_rdlock (scn->elf->lock);
+
+  if (scn->elf->class == ELFCLASS32)
+    {
+      /* We have to convert the data.  */
+      if (unlikely ((ndx + 1) * sizeof (Elf32_Rela) > data_scn->d.d_size))
+	{
+	  __libelf_seterrno (ELF_E_INVALID_INDEX);
+	  result = NULL;
+	}
+      else
+	{
+	  Elf32_Rela *src = &((Elf32_Rela *) data_scn->d.d_buf)[ndx];
+
+	  dst->r_offset = src->r_offset;
+	  dst->r_info = GELF_R_INFO (ELF32_R_SYM (src->r_info),
+				     ELF32_R_TYPE (src->r_info));
+	  dst->r_addend = src->r_addend;
+
+	  result = dst;
+	}
+    }
+  else
+    {
+      /* Simply copy the data after we made sure we are actually getting
+	 correct data.  */
+      if (unlikely ((ndx + 1) * sizeof (Elf64_Rela) > data_scn->d.d_size))
+	{
+	  __libelf_seterrno (ELF_E_INVALID_INDEX);
+	  result = NULL;
+	}
+      else
+	result = memcpy (dst, &((Elf64_Rela *) data_scn->d.d_buf)[ndx],
+			 sizeof (Elf64_Rela));
+    }
+
+  rwlock_unlock (scn->elf->lock);
+
+  return result;
+}