2012-03-05 Tristan Gingold <gingold@adacore.com>

	* ia64-tdep.h: Include libunwind-frame.h and libunwind-ia64.h.
	(ia64_unw_accessors, ia64_unw_rse_accessors)
	(ia64_libunwind_descr): Declare.
	* ia64-vms-tdep.c: New file.
	* ia64-tdep.c (ia64_unw_accessors, ia64_unw_rse_accessors)
	(ia64_libunwind_descr): Make them public.
	* configure.tgt: Add ia64-*-*vms*.
	* Makefile.in (ALL_64_TARGET_OBS): Add ia64-vms-tdep.o
	(ALLDEPFILES): Add ia64-vms-tdep.c

1 files changed, 165 insertions, 0 deletions

diff --git a/gdb/ia64-vms-tdep.c b/gdb/ia64-vms-tdep.c
new file mode 100644
index 0000000..859c0b4
--- /dev/null
+++ b/gdb/ia64-vms-tdep.c
@@ -0,0 +1,165 @@
+/* Target-dependent code for OpenVMS IA-64.
+
+   Copyright (C) 2012 Free Software Foundation, Inc.
+
+   This file is part of GDB.
+
+   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; either version 3 of the License, or
+   (at your option) any later version.
+
+   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, see <http://www.gnu.org/licenses/>.  */
+
+#include "defs.h"
+#include "frame-unwind.h"
+#include "ia64-tdep.h"
+#include "osabi.h"
+#include "gdbtypes.h"
+#include "gdbcore.h"
+
+#ifdef HAVE_LIBUNWIND_IA64_H
+
+/* Libunwind callback accessor function to acquire procedure unwind-info.  */
+
+static int
+ia64_vms_find_proc_info_x (unw_addr_space_t as, unw_word_t ip,
+                           unw_proc_info_t *pi,
+                           int need_unwind_info, void *arg)
+{
+  enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch);
+  unw_dyn_info_t di;
+  int ret;
+  gdb_byte buf[32];
+  const char *annex = core_addr_to_string (ip);
+  LONGEST res;
+  CORE_ADDR table_addr;
+  unsigned int info_len;
+
+  res = target_read (&current_target, TARGET_OBJECT_OPENVMS_UIB,
+                     annex + 2, buf, 0, sizeof (buf));
+
+  if (res != sizeof (buf))
+    return -UNW_ENOINFO;
+
+  pi->format = UNW_INFO_FORMAT_REMOTE_TABLE;
+  pi->start_ip = extract_unsigned_integer (buf + 0, 8, byte_order);
+  pi->end_ip = extract_unsigned_integer (buf + 8, 8, byte_order);
+  pi->gp = extract_unsigned_integer (buf + 24, 8, byte_order);
+  table_addr = extract_unsigned_integer (buf + 16, 8, byte_order);
+
+  if (table_addr == 0)
+    {
+      /* No unwind data.  */
+      pi->unwind_info = NULL;
+      pi->unwind_info_size = 0;
+      return 0;
+    }
+
+  res = target_read_memory (table_addr, buf, 8);
+  if (res != 0)
+    return -UNW_ENOINFO;
+
+  /* Check version.  */
+  if (extract_unsigned_integer (buf + 6, 2, byte_order) != 1)
+    return -UNW_EBADVERSION;
+  info_len = extract_unsigned_integer (buf + 0, 4, byte_order);
+  pi->unwind_info_size = 8 * info_len;
+
+  /* Read info.  */
+  pi->unwind_info = xmalloc (pi->unwind_info_size);
+
+  res = target_read_memory (table_addr + 8,
+                            pi->unwind_info, pi->unwind_info_size);
+  if (res != 0)
+    {
+      xfree (pi->unwind_info);
+      pi->unwind_info = NULL;
+      return -UNW_ENOINFO;
+    }
+
+  /* FIXME: Handle OSSD (OS Specific Data).  This extension to ia64 unwind
+     information by OpenVMS is currently not handled by libunwind, but
+     looks to be used only in very specific context, and is not generated by
+     GCC.  */
+
+  pi->lsda = table_addr + 8 + pi->unwind_info_size;
+  if (extract_unsigned_integer (buf + 4, 2, byte_order) & 3)
+    {
+      pi->lsda += 8;
+      /* There might be an handler, but this is not used for unwinding.  */
+      pi->handler = 0;
+    }
+
+  return 0;
+}
+
+/* Libunwind callback accessor function for cleanup.  */
+
+static void
+ia64_vms_put_unwind_info (unw_addr_space_t as,
+                          unw_proc_info_t *pip, void *arg)
+{
+  /* Nothing required for now.  */
+}
+
+/* Libunwind callback accessor function to get head of the dynamic
+   unwind-info registration list.  */
+
+static int
+ia64_vms_get_dyn_info_list (unw_addr_space_t as,
+                            unw_word_t *dilap, void *arg)
+{
+  return -UNW_ENOINFO;
+}
+
+/* Set of libunwind callback acccessor functions.  */
+static unw_accessors_t ia64_vms_unw_accessors;
+static unw_accessors_t ia64_vms_unw_rse_accessors;
+
+/* Set of ia64 gdb libunwind-frame callbacks and data for generic
+   libunwind-frame code to use.  */
+static struct libunwind_descr ia64_vms_libunwind_descr;
+
+#endif /* HAVE_LIBUNWIND_IA64_H */
+
+static void
+ia64_openvms_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
+{
+  set_gdbarch_long_double_format (gdbarch, floatformats_ia64_quad);
+
+#ifdef HAVE_LIBUNWIND_IA64_H
+  /* Override the default descriptor.  */
+  ia64_vms_unw_accessors = ia64_unw_accessors;
+  ia64_vms_unw_accessors.find_proc_info = ia64_vms_find_proc_info_x;
+  ia64_vms_unw_accessors.put_unwind_info = ia64_vms_put_unwind_info;
+  ia64_vms_unw_accessors.get_dyn_info_list_addr = ia64_vms_get_dyn_info_list;
+
+  ia64_vms_unw_rse_accessors = ia64_unw_rse_accessors;
+  ia64_vms_unw_rse_accessors.find_proc_info = ia64_vms_find_proc_info_x;
+  ia64_vms_unw_rse_accessors.put_unwind_info = ia64_vms_put_unwind_info;
+  ia64_vms_unw_rse_accessors.get_dyn_info_list_addr = ia64_vms_get_dyn_info_list;
+
+  ia64_vms_libunwind_descr = ia64_libunwind_descr;
+  ia64_vms_libunwind_descr.accessors = &ia64_vms_unw_accessors;
+  ia64_vms_libunwind_descr.special_accessors = &ia64_vms_unw_rse_accessors;
+
+  libunwind_frame_set_descr (gdbarch, &ia64_vms_libunwind_descr);
+#endif
+}
+
+/* Provide a prototype to silence -Wmissing-prototypes.  */
+extern initialize_file_ftype _initialize_ia64_hpux_tdep;
+
+void
+_initialize_ia64_hpux_tdep (void)
+{
+  gdbarch_register_osabi (bfd_arch_ia64, 0, GDB_OSABI_OPENVMS,
+			  ia64_openvms_init_abi);
+}