Initial Contribution

1 files changed, 105 insertions, 0 deletions

diff --git a/libelf/gelf_getsym.c b/libelf/gelf_getsym.c
new file mode 100644
index 00000000..90536c60
--- /dev/null
+++ b/libelf/gelf_getsym.c
@@ -0,0 +1,105 @@
+/* Get symbol information from symbol table at the given index.
+   Copyright (C) 1999, 2000, 2001, 2002 Red Hat, Inc.
+   Written by Ulrich Drepper <drepper@redhat.com>, 1999.
+
+   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 <assert.h>
+#include <gelf.h>
+#include <string.h>
+
+#include "libelfP.h"
+
+
+GElf_Sym *
+gelf_getsym (data, ndx, dst)
+     Elf_Data *data;
+     int ndx;
+     GElf_Sym *dst;
+{
+  Elf_Data_Scn *data_scn = (Elf_Data_Scn *) data;
+  GElf_Sym *result = NULL;
+
+  if (data == NULL)
+    return NULL;
+
+  if (unlikely (data->d_type != ELF_T_SYM))
+    {
+      __libelf_seterrno (ELF_E_INVALID_HANDLE);
+      return NULL;
+    }
+
+  rwlock_rdlock (data_scn->s->elf->lock);
+
+  /* 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.  */
+  if (data_scn->s->elf->class == ELFCLASS32)
+    {
+      Elf32_Sym *src;
+
+      /* Here it gets a bit more complicated.  The format of the symbol
+	 table entries has to be adopted.  The user better has provided
+	 a buffer where we can store the information.  While copying the
+	 data we are converting the format.  */
+      if (unlikely ((ndx + 1) * sizeof (Elf32_Sym) > data->d_size))
+	{
+	  __libelf_seterrno (ELF_E_INVALID_INDEX);
+	  goto out;
+	}
+
+      src = &((Elf32_Sym *) data->d_buf)[ndx];
+
+      /* This might look like a simple copy operation but it's
+	 not.  There are zero- and sign-extensions going on.  */
+#define COPY(name) \
+      dst->name = src->name
+      COPY (st_name);
+      /* 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);
+      COPY (st_value);
+      COPY (st_size);
+    }
+  else
+    {
+      /* If this is a 64 bit object it's easy.  */
+      assert (sizeof (GElf_Sym) == sizeof (Elf64_Sym));
+
+      /* The data is already in the correct form.  Just make sure the
+	 index is OK.  */
+      if (unlikely ((ndx + 1) * sizeof (GElf_Sym) > data->d_size))
+	{
+	  __libelf_seterrno (ELF_E_INVALID_INDEX);
+	  goto out;
+	}
+
+      *dst = ((GElf_Sym *) data->d_buf)[ndx];
+    }
+
+  result = dst;
+
+ out:
+  rwlock_unlock (data_scn->s->elf->lock);
+
+  return result;
+}
+INTDEF(gelf_getsym)