2009-08-04 Thiago Jung Bauermann <thiago.bauermann@gmail.com>

gdb/
	* linux-tdep.c (check_is_pie_binary,
	_initialize_linux_tdep): New functions.

gdb/testsuite/
	* gdb.base/pie-support.exp: New file.
	* gdb.base/pie-support.c: New file.

1 files changed, 31 insertions, 0 deletions

diff --git a/gdb/linux-tdep.c b/gdb/linux-tdep.c
index 37770f5..6634703 100644
--- a/gdb/linux-tdep.c
+++ b/gdb/linux-tdep.c
@@ -18,8 +18,12 @@
    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
 #include "defs.h"
+#include "gdbcore.h"
 #include "gdbtypes.h"
 #include "linux-tdep.h"
+#include "observer.h"
+
+#include "elf-bfd.h"
 
 /* This function is suitable for architectures that don't
    extend/override the standard siginfo structure.  */
@@ -134,3 +138,30 @@ linux_get_siginfo_type (struct gdbarch *gdbarch)
 
   return siginfo_type;
 }
+
+/* Observer for the executable_changed event, to check whether the new
+   exec binary is a PIE (Position Independent Executable) specimen, which
+   is currently unsupported.  */
+
+static void
+check_is_pie_binary (void)
+{
+  Elf_Internal_Ehdr *elf_hdr;
+
+  if (!exec_bfd)
+    return;
+  else if (bfd_get_flavour (exec_bfd) != bfd_target_elf_flavour)
+    return;
+
+  if (elf_tdata (exec_bfd)->elf_header->e_type == ET_DYN)
+    warning (_("\
+The current binary is a PIE (Position Independent Executable), which\n\
+GDB does NOT currently support.  Most debugger features will fail if used\n\
+in this session.\n"));
+}
+
+void
+_initialize_linux_tdep (void)
+{
+  observer_attach_executable_changed (check_is_pie_binary);
+}