2011-02-21 Hui Zhu <teawater@gmail.com>

[deliverable/binutils-gdb.git] / gdb / linux-tdep.c

diff --git a/gdb/linux-tdep.c b/gdb/linux-tdep.c
index 663470303924a751028b80da559313c31789e931..c09d6e8719daca5d24db20017decec89ff0bf889 100644 (file)
--- a/gdb/linux-tdep.c
+++ b/gdb/linux-tdep.c
@@ -1,6 +1,6 @@
 /* Target-dependent code for GNU/Linux, architecture independent.
 
-   Copyright (C) 2009 Free Software Foundation, Inc.
+   Copyright (C) 2009, 2010, 2011 Free Software Foundation, Inc.
 
    This file is part of GDB.
 
@@ -18,12 +18,31 @@
    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 "auxv.h"
+#include "target.h"
+#include "elf/common.h"
+#include "inferior.h"
 
-#include "elf-bfd.h"
+static struct gdbarch_data *linux_gdbarch_data_handle;
+
+struct linux_gdbarch_data
+  {
+    struct type *siginfo_type;
+  };
+
+static void *
+init_linux_gdbarch_data (struct gdbarch *gdbarch)
+{
+  return GDBARCH_OBSTACK_ZALLOC (gdbarch, struct linux_gdbarch_data);
+}
+
+static struct linux_gdbarch_data *
+get_linux_gdbarch_data (struct gdbarch *gdbarch)
+{
+  return gdbarch_data (gdbarch, linux_gdbarch_data_handle);
+}
 
 /* This function is suitable for architectures that don't
    extend/override the standard siginfo structure.  */
@@ -31,12 +50,17 @@
 struct type *
 linux_get_siginfo_type (struct gdbarch *gdbarch)
 {
+  struct linux_gdbarch_data *linux_gdbarch_data;
   struct type *int_type, *uint_type, *long_type, *void_ptr_type;
   struct type *uid_type, *pid_type;
   struct type *sigval_type, *clock_type;
   struct type *siginfo_type, *sifields_type;
   struct type *type;
 
+  linux_gdbarch_data = get_linux_gdbarch_data (gdbarch);
+  if (linux_gdbarch_data->siginfo_type != NULL)
+    return linux_gdbarch_data->siginfo_type;
+
   int_type = arch_integer_type (gdbarch, gdbarch_int_bit (gdbarch),
                                0, "int");
   uint_type = arch_integer_type (gdbarch, gdbarch_int_bit (gdbarch),
@@ -136,32 +160,54 @@ linux_get_siginfo_type (struct gdbarch *gdbarch)
                                       "_sifields", sifields_type,
                                       TYPE_LENGTH (long_type));
 
+  linux_gdbarch_data->siginfo_type = siginfo_type;
+
   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.  */
+int
+linux_has_shared_address_space (void)
+{
+  /* Determine whether we are running on uClinux or normal Linux
+     kernel.  */
+  CORE_ADDR dummy;
+  int target_is_uclinux;
+
+  target_is_uclinux
+    = (target_auxv_search (&current_target, AT_NULL, &dummy) > 0
+       && target_auxv_search (&current_target, AT_PAGESZ, &dummy) == 0);
+
+  return target_is_uclinux;
+}
+
+/* This is how we want PTIDs from core files to be printed.  */
+
+static char *
+linux_core_pid_to_str (struct gdbarch *gdbarch, ptid_t ptid)
+{
+  static char buf[80];
 
-static void
-check_is_pie_binary (void)
+  if (ptid_get_lwp (ptid) != 0)
+    {
+      snprintf (buf, sizeof (buf), "LWP %ld", ptid_get_lwp (ptid));
+      return buf;
+    }
+
+  return normal_pid_to_str (ptid);
+}
+
+/* To be called from the various GDB_OSABI_LINUX handlers for the
+   various GNU/Linux architectures and machine types.  */
+
+void
+linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 {
-  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"));
+  set_gdbarch_core_pid_to_str (gdbarch, linux_core_pid_to_str);
 }
 
 void
 _initialize_linux_tdep (void)
 {
-  observer_attach_executable_changed (check_is_pie_binary);
+  linux_gdbarch_data_handle =
+    gdbarch_data_register_post_init (init_linux_gdbarch_data);
 }