gdb/

	* libunwind-frame.c: Rename to ...
	* ia64-libunwind-tdep.c: ... here.
	* libunwind-frame.h: Rename to ...
	* ia64-libunwind-tdep.h: ... here.
	* Makefile.in (HFILES_NO_SRCDIR): Rename libunwind-frame.h to
	ia64-libunwind-tdep.h.
	(ALLDEPFILES): Rename libunwind-frame.c to ia64-libunwind-tdep.c.
	* README (--with-libunwind): Rename to ...
	(--with-libunwind-ia64): ... here, note it is ia64 specific now.
	* config.in: Regenerate.
	* configure: Regenerate.
	* configure.ac: New option --with-libunwind-ia64, make the
	AS_HELP_STRING ia64 specific.  Deprecate option --with-libunwind.
	Remove AC_DEFINE for HAVE_LIBUNWIND.
	* ia64-libunwind-tdep.c: Make the file top comment ia64 specific.
	Rename libunwind-frame.h #include to ia64-libunwind-tdep.h.
	Rename libunwind-frame in the general comment.
	* ia64-libunwind-tdep.h: Make the file top comment ia64 specific.
	Rename symbol LIBUNWIND_FRAME_H to IA64_TDEP_LIBUNWIND_FRAME_H.
	Move forward declarations inside #ifndef.  Rename libunwind-frame in
	the general comment.
	* ia64-tdep.c: Rename libunwind-frame.h #include to
	ia64-libunwind-tdep.h.
	(ia64_gdb2uw_regnum, ia64_uw2gdb_regnum, ia64_is_fpreg)
	(ia64_libunwind_descr): Rename libunwind-frame to
	ia64-libunwind-tdep in these function comments.
	* ia64-tdep.h: Rename libunwind-frame.h #include to
	ia64-libunwind-tdep.h.
	* ia64-vms-tdep.c (ia64_vms_libunwind_descr): Rename libunwind-frame to
	ia64-libunwind-tdep in that data comment.

1 files changed, 582 insertions, 0 deletions

diff --git a/gdb/ia64-libunwind-tdep.c b/gdb/ia64-libunwind-tdep.c
new file mode 100644
index 00000000000..e1c89c48a53
--- /dev/null
+++ b/gdb/ia64-libunwind-tdep.c
@@ -0,0 +1,582 @@
+/* Frame unwinder for ia64 frames using the libunwind library.
+
+   Copyright (C) 2003-2004, 2006-2012 Free Software Foundation, Inc.
+
+   Written by Jeff Johnston, contributed by Red Hat 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 "inferior.h"
+#include "frame.h"
+#include "frame-base.h"
+#include "frame-unwind.h"
+#include "gdbcore.h"
+#include "gdbtypes.h"
+#include "symtab.h"
+#include "objfiles.h"
+#include "regcache.h"
+
+#include <dlfcn.h>
+
+#include "gdb_assert.h"
+#include "gdb_string.h"
+
+#include "ia64-libunwind-tdep.h"
+
+#include "complaints.h"
+
+/* IA-64 is the only target that currently uses ia64-libunwind-tdep.
+   Note how UNW_TARGET, UNW_OBJ, etc. are compile time constants below.
+   Those come from libunwind's headers, and are target dependent.
+   Also, some of libunwind's typedefs are target dependent, as e.g.,
+   unw_word_t.  If some other target wants to use this, we will need
+   to do some abstracting in order to make it possible to select which
+   libunwind we're talking to at runtime (and have one per arch).  */
+
+/* The following two macros are normally defined in <endian.h>.
+   But systems such as ia64-hpux do not provide such header, so
+   we just define them here if not already defined.  */
+#ifndef __LITTLE_ENDIAN
+#define __LITTLE_ENDIAN 1234
+#endif
+#ifndef __BIG_ENDIAN
+#define __BIG_ENDIAN    4321
+#endif
+
+static int libunwind_initialized;
+static struct gdbarch_data *libunwind_descr_handle;
+
+/* Required function pointers from libunwind.  */
+static int (*unw_get_reg_p) (unw_cursor_t *, unw_regnum_t, unw_word_t *);
+static int (*unw_get_fpreg_p) (unw_cursor_t *, unw_regnum_t, unw_fpreg_t *);
+static int (*unw_get_saveloc_p) (unw_cursor_t *, unw_regnum_t,
+				 unw_save_loc_t *);
+static int (*unw_is_signal_frame_p) (unw_cursor_t *);
+static int (*unw_step_p) (unw_cursor_t *);
+static int (*unw_init_remote_p) (unw_cursor_t *, unw_addr_space_t, void *);
+static unw_addr_space_t (*unw_create_addr_space_p) (unw_accessors_t *, int);
+static void (*unw_destroy_addr_space_p) (unw_addr_space_t);
+static int (*unw_search_unwind_table_p) (unw_addr_space_t, unw_word_t,
+					 unw_dyn_info_t *,
+					 unw_proc_info_t *, int, void *);
+static unw_word_t (*unw_find_dyn_list_p) (unw_addr_space_t, unw_dyn_info_t *,
+					  void *);
+
+
+struct libunwind_frame_cache
+{
+  CORE_ADDR base;
+  CORE_ADDR func_addr;
+  unw_cursor_t cursor;
+  unw_addr_space_t as;
+};
+
+/* We need to qualify the function names with a platform-specific prefix
+   to match the names used by the libunwind library.  The UNW_OBJ macro is
+   provided by the libunwind.h header file.  */
+#define STRINGIFY2(name)	#name
+#define STRINGIFY(name)		STRINGIFY2(name)
+
+#ifndef LIBUNWIND_SO
+/* Use the stable ABI major version number.  `libunwind-ia64.so' is a link time
+   only library, not a runtime one.  */
+#define LIBUNWIND_SO "libunwind-" STRINGIFY(UNW_TARGET) ".so.8"
+
+/* Provide also compatibility with older .so.  The two APIs are compatible, .8
+   is only extended a bit, GDB does not use the extended API at all.  */
+#define LIBUNWIND_SO_7 "libunwind-" STRINGIFY(UNW_TARGET) ".so.7"
+#endif
+
+static char *get_reg_name = STRINGIFY(UNW_OBJ(get_reg));
+static char *get_fpreg_name = STRINGIFY(UNW_OBJ(get_fpreg));
+static char *get_saveloc_name = STRINGIFY(UNW_OBJ(get_save_loc));
+static char *is_signal_frame_name = STRINGIFY(UNW_OBJ(is_signal_frame));
+static char *step_name = STRINGIFY(UNW_OBJ(step));
+static char *init_remote_name = STRINGIFY(UNW_OBJ(init_remote));
+static char *create_addr_space_name = STRINGIFY(UNW_OBJ(create_addr_space));
+static char *destroy_addr_space_name = STRINGIFY(UNW_OBJ(destroy_addr_space));
+static char *search_unwind_table_name
+  = STRINGIFY(UNW_OBJ(search_unwind_table));
+static char *find_dyn_list_name = STRINGIFY(UNW_OBJ(find_dyn_list));
+
+static struct libunwind_descr *
+libunwind_descr (struct gdbarch *gdbarch)
+{
+  return gdbarch_data (gdbarch, libunwind_descr_handle);
+}
+
+static void *
+libunwind_descr_init (struct gdbarch *gdbarch)
+{
+  struct libunwind_descr *descr
+    = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct libunwind_descr);
+
+  return descr;
+}
+
+void
+libunwind_frame_set_descr (struct gdbarch *gdbarch,
+			   struct libunwind_descr *descr)
+{
+  struct libunwind_descr *arch_descr;
+
+  gdb_assert (gdbarch != NULL);
+
+  arch_descr = gdbarch_data (gdbarch, libunwind_descr_handle);
+
+  if (arch_descr == NULL)
+    {
+      /* First time here.  Must initialize data area.  */
+      arch_descr = libunwind_descr_init (gdbarch);
+      deprecated_set_gdbarch_data (gdbarch,
+				   libunwind_descr_handle, arch_descr);
+    }
+
+  /* Copy new descriptor info into arch descriptor.  */
+  arch_descr->gdb2uw = descr->gdb2uw;
+  arch_descr->uw2gdb = descr->uw2gdb;
+  arch_descr->is_fpreg = descr->is_fpreg;
+  arch_descr->accessors = descr->accessors;
+  arch_descr->special_accessors = descr->special_accessors;
+}
+
+static struct libunwind_frame_cache *
+libunwind_frame_cache (struct frame_info *this_frame, void **this_cache)
+{
+  unw_accessors_t *acc;
+  unw_addr_space_t as;
+  unw_word_t fp;
+  unw_regnum_t uw_sp_regnum;
+  struct libunwind_frame_cache *cache;
+  struct libunwind_descr *descr;
+  struct gdbarch *gdbarch = get_frame_arch (this_frame);
+  int i, ret;
+
+  if (*this_cache)
+    return *this_cache;
+
+  /* Allocate a new cache.  */
+  cache = FRAME_OBSTACK_ZALLOC (struct libunwind_frame_cache);
+
+  cache->func_addr = get_frame_func (this_frame);
+  if (cache->func_addr == 0)
+    /* This can happen when the frame corresponds to a function for which
+       there is no debugging information nor any entry in the symbol table.
+       This is probably a static function for which an entry in the symbol
+       table was not created when the objfile got linked (observed in
+       libpthread.so on ia64-hpux).
+
+       The best we can do, in that case, is use the frame PC as the function
+       address.  We don't need to give up since we still have the unwind
+       record to help us perform the unwinding.  There is also another
+       compelling to continue, because abandonning now means stopping
+       the backtrace, which can never be helpful for the user.  */
+    cache->func_addr = get_frame_pc (this_frame);
+
+  /* Get a libunwind cursor to the previous frame.
+  
+     We do this by initializing a cursor.  Libunwind treats a new cursor
+     as the top of stack and will get the current register set via the
+     libunwind register accessor.  Now, we provide the platform-specific
+     accessors and we set up the register accessor to use the frame
+     register unwinding interfaces so that we properly get the registers
+     for the current frame rather than the top.  We then use the unw_step
+     function to move the libunwind cursor back one frame.  We can later
+     use this cursor to find previous registers via the unw_get_reg
+     interface which will invoke libunwind's special logic.  */
+  descr = libunwind_descr (gdbarch);
+  acc = descr->accessors;
+  as =  unw_create_addr_space_p (acc,
+				 gdbarch_byte_order (gdbarch)
+				 == BFD_ENDIAN_BIG
+				 ? __BIG_ENDIAN
+				 : __LITTLE_ENDIAN);
+
+  unw_init_remote_p (&cache->cursor, as, this_frame);
+  if (unw_step_p (&cache->cursor) < 0)
+    {
+      unw_destroy_addr_space_p (as);
+      return NULL;
+    }
+
+  /* To get base address, get sp from previous frame.  */
+  uw_sp_regnum = descr->gdb2uw (gdbarch_sp_regnum (gdbarch));
+  ret = unw_get_reg_p (&cache->cursor, uw_sp_regnum, &fp);
+  if (ret < 0)
+    {
+      unw_destroy_addr_space_p (as);
+      error (_("Can't get libunwind sp register."));
+    }
+
+  cache->base = (CORE_ADDR)fp;
+  cache->as = as;
+
+  *this_cache = cache;
+  return cache;
+}
+
+void
+libunwind_frame_dealloc_cache (struct frame_info *self, void *this_cache)
+{
+  struct libunwind_frame_cache *cache = this_cache;
+
+  if (cache->as)
+    unw_destroy_addr_space_p (cache->as);
+}
+
+unw_word_t
+libunwind_find_dyn_list (unw_addr_space_t as, unw_dyn_info_t *di, void *arg)
+{
+  return unw_find_dyn_list_p (as, di, arg);
+}
+
+/* Verify if there is sufficient libunwind information for the frame to use
+   libunwind frame unwinding.  */
+int
+libunwind_frame_sniffer (const struct frame_unwind *self,
+                         struct frame_info *this_frame, void **this_cache)
+{
+  unw_cursor_t cursor;
+  unw_accessors_t *acc;
+  unw_addr_space_t as;
+  struct libunwind_descr *descr;
+  struct gdbarch *gdbarch = get_frame_arch (this_frame);
+  int i, ret;
+
+  /* To test for libunwind unwind support, initialize a cursor to
+     the current frame and try to back up.  We use this same method
+     when setting up the frame cache (see libunwind_frame_cache()).
+     If libunwind returns success for this operation, it means that
+     it has found sufficient libunwind unwinding information to do so.  */
+
+  descr = libunwind_descr (gdbarch);
+  acc = descr->accessors;
+  as =  unw_create_addr_space_p (acc,
+				 gdbarch_byte_order (gdbarch)
+				 == BFD_ENDIAN_BIG
+				 ? __BIG_ENDIAN
+				 : __LITTLE_ENDIAN);
+
+  ret = unw_init_remote_p (&cursor, as, this_frame);
+
+  if (ret < 0)
+    {
+      unw_destroy_addr_space_p (as);
+      return 0;
+    }
+
+ 
+  /* Check to see if we have libunwind info by checking if we are in a 
+     signal frame.  If it doesn't return an error, we have libunwind info
+     and can use libunwind.  */
+  ret = unw_is_signal_frame_p (&cursor);
+  unw_destroy_addr_space_p (as);
+
+  if (ret < 0)
+    return 0;
+
+  return 1;
+}
+
+void
+libunwind_frame_this_id (struct frame_info *this_frame, void **this_cache,
+		         struct frame_id *this_id)
+{
+  struct libunwind_frame_cache *cache =
+    libunwind_frame_cache (this_frame, this_cache);
+
+  if (cache != NULL)
+    (*this_id) = frame_id_build (cache->base, cache->func_addr);
+}
+
+struct value *
+libunwind_frame_prev_register (struct frame_info *this_frame,
+                               void **this_cache, int regnum)
+{
+  struct libunwind_frame_cache *cache =
+    libunwind_frame_cache (this_frame, this_cache);
+  struct gdbarch *gdbarch = get_frame_arch (this_frame);
+
+  void *ptr;
+  unw_cursor_t *c;
+  unw_save_loc_t sl;
+  int i, ret;
+  unw_word_t intval;
+  unw_fpreg_t fpval;
+  unw_regnum_t uw_regnum;
+  struct libunwind_descr *descr;
+  struct value *val = NULL;
+
+  if (cache == NULL)
+    return frame_unwind_got_constant (this_frame, regnum, 0);
+  
+  /* Convert from gdb register number to libunwind register number.  */
+  descr = libunwind_descr (get_frame_arch (this_frame));
+  uw_regnum = descr->gdb2uw (regnum);
+
+  gdb_assert (regnum >= 0);
+
+  if (!target_has_registers)
+    error (_("No registers."));
+
+  if (uw_regnum < 0)
+    return frame_unwind_got_constant (this_frame, regnum, 0);
+
+  if (unw_get_saveloc_p (&cache->cursor, uw_regnum, &sl) < 0)
+    return frame_unwind_got_constant (this_frame, regnum, 0);
+
+  switch (sl.type)
+    {
+    case UNW_SLT_MEMORY:
+      val = frame_unwind_got_memory (this_frame, regnum, sl.u.addr);
+      break;
+
+    case UNW_SLT_REG:
+      val = frame_unwind_got_register (this_frame, regnum,
+                                       descr->uw2gdb (sl.u.regnum));
+      break;
+    case UNW_SLT_NONE:
+      {
+        /* The register is not stored at a specific memory address nor
+           inside another register.  So use libunwind to fetch the register
+           value for us, and create a constant value with the result.  */
+        if (descr->is_fpreg (uw_regnum))
+          {
+            ret = unw_get_fpreg_p (&cache->cursor, uw_regnum, &fpval);
+            if (ret < 0)
+              return frame_unwind_got_constant (this_frame, regnum, 0);
+            val = frame_unwind_got_bytes (this_frame, regnum,
+                                          (gdb_byte *) &fpval);
+          }
+        else
+          {
+            ret = unw_get_reg_p (&cache->cursor, uw_regnum, &intval);
+            if (ret < 0)
+              return frame_unwind_got_constant (this_frame, regnum, 0);
+            val = frame_unwind_got_constant (this_frame, regnum, intval);
+          }
+        break;
+      }
+    }
+
+  return val;
+} 
+
+/* The following is a glue routine to call the libunwind unwind table
+   search function to get unwind information for a specified ip address.  */ 
+int
+libunwind_search_unwind_table (void *as, long ip, void *di,
+			       void *pi, int need_unwind_info, void *args)
+{
+  return unw_search_unwind_table_p (*(unw_addr_space_t *)as, (unw_word_t )ip, 
+				    di, pi, need_unwind_info, args);
+}
+
+/* Verify if we are in a sigtramp frame and we can use libunwind to unwind.  */
+int
+libunwind_sigtramp_frame_sniffer (const struct frame_unwind *self,
+                                  struct frame_info *this_frame,
+                                  void **this_cache)
+{
+  unw_cursor_t cursor;
+  unw_accessors_t *acc;
+  unw_addr_space_t as;
+  struct libunwind_descr *descr;
+  struct gdbarch *gdbarch = get_frame_arch (this_frame);
+  int i, ret;
+
+  /* To test for libunwind unwind support, initialize a cursor to the
+     current frame and try to back up.  We use this same method when
+     setting up the frame cache (see libunwind_frame_cache()).  If
+     libunwind returns success for this operation, it means that it
+     has found sufficient libunwind unwinding information to do
+     so.  */
+
+  descr = libunwind_descr (gdbarch);
+  acc = descr->accessors;
+  as =  unw_create_addr_space_p (acc,
+				 gdbarch_byte_order (gdbarch)
+				 == BFD_ENDIAN_BIG
+				 ? __BIG_ENDIAN
+				 : __LITTLE_ENDIAN);
+
+  ret = unw_init_remote_p (&cursor, as, this_frame);
+
+  if (ret < 0)
+    {
+      unw_destroy_addr_space_p (as);
+      return 0;
+    }
+
+  /* Check to see if we are in a signal frame.  */
+  ret = unw_is_signal_frame_p (&cursor);
+  unw_destroy_addr_space_p (as);
+  if (ret > 0)
+    return 1;
+
+  return 0;
+}
+
+/* The following routine is for accessing special registers of the top frame.
+   A special set of accessors must be given that work without frame info.
+   This is used by ia64 to access the rse registers r32-r127.  While they
+   are usually located at BOF, this is not always true and only the libunwind
+   info can decipher where they actually are.  */
+int
+libunwind_get_reg_special (struct gdbarch *gdbarch, struct regcache *regcache,
+			   int regnum, void *buf)
+{
+  unw_cursor_t cursor;
+  unw_accessors_t *acc;
+  unw_addr_space_t as;
+  struct libunwind_descr *descr;
+  int ret;
+  unw_regnum_t uw_regnum;
+  unw_word_t intval;
+  unw_fpreg_t fpval;
+  void *ptr;
+
+
+  descr = libunwind_descr (gdbarch);
+  acc = descr->special_accessors;
+  as =  unw_create_addr_space_p (acc,
+				 gdbarch_byte_order (gdbarch)
+				 == BFD_ENDIAN_BIG
+				 ? __BIG_ENDIAN
+				 : __LITTLE_ENDIAN);
+
+  ret = unw_init_remote_p (&cursor, as, regcache);
+  if (ret < 0)
+    {
+      unw_destroy_addr_space_p (as);
+      return -1;
+    }
+
+  uw_regnum = descr->gdb2uw (regnum);
+
+  if (descr->is_fpreg (uw_regnum))
+    {
+      ret = unw_get_fpreg_p (&cursor, uw_regnum, &fpval);
+      ptr = &fpval;
+    }
+  else
+    {
+      ret = unw_get_reg_p (&cursor, uw_regnum, &intval);
+      ptr = &intval;
+    }
+
+  unw_destroy_addr_space_p (as);
+
+  if (ret < 0)
+    return -1;
+
+  if (buf)
+    memcpy (buf, ptr, register_size (gdbarch, regnum));
+
+  return 0;
+}
+  
+static int
+libunwind_load (void)
+{
+  void *handle;
+  char *so_error = NULL;
+
+  handle = dlopen (LIBUNWIND_SO, RTLD_NOW);
+  if (handle == NULL)
+    {
+      so_error = xstrdup (dlerror ());
+#ifdef LIBUNWIND_SO_7
+      handle = dlopen (LIBUNWIND_SO_7, RTLD_NOW);
+#endif /* LIBUNWIND_SO_7 */
+    }
+  if (handle == NULL)
+    {
+      fprintf_unfiltered (gdb_stderr, _("[GDB failed to load %s: %s]\n"),
+			  LIBUNWIND_SO, so_error);
+#ifdef LIBUNWIND_SO_7
+      fprintf_unfiltered (gdb_stderr, _("[GDB failed to load %s: %s]\n"),
+			  LIBUNWIND_SO_7, dlerror ());
+#endif /* LIBUNWIND_SO_7 */
+    }
+  xfree (so_error);
+  if (handle == NULL)
+    return 0;
+
+  /* Initialize pointers to the dynamic library functions we will use.  */
+
+  unw_get_reg_p = dlsym (handle, get_reg_name);
+  if (unw_get_reg_p == NULL)
+    return 0;
+
+  unw_get_fpreg_p = dlsym (handle, get_fpreg_name);
+  if (unw_get_fpreg_p == NULL)
+    return 0;
+
+  unw_get_saveloc_p = dlsym (handle, get_saveloc_name);
+  if (unw_get_saveloc_p == NULL)
+    return 0;
+
+  unw_is_signal_frame_p = dlsym (handle, is_signal_frame_name);
+  if (unw_is_signal_frame_p == NULL)
+    return 0;
+
+  unw_step_p = dlsym (handle, step_name);
+  if (unw_step_p == NULL)
+    return 0;
+
+  unw_init_remote_p = dlsym (handle, init_remote_name);
+  if (unw_init_remote_p == NULL)
+    return 0;
+
+  unw_create_addr_space_p = dlsym (handle, create_addr_space_name);
+  if (unw_create_addr_space_p == NULL)
+    return 0;
+
+  unw_destroy_addr_space_p = dlsym (handle, destroy_addr_space_name);
+  if (unw_destroy_addr_space_p == NULL)
+    return 0;
+
+  unw_search_unwind_table_p = dlsym (handle, search_unwind_table_name);
+  if (unw_search_unwind_table_p == NULL)
+    return 0;
+
+  unw_find_dyn_list_p = dlsym (handle, find_dyn_list_name);
+  if (unw_find_dyn_list_p == NULL)
+    return 0;
+   
+  return 1;
+}
+
+int
+libunwind_is_initialized (void)
+{
+  return libunwind_initialized;
+}
+
+/* Provide a prototype to silence -Wmissing-prototypes.  */
+void _initialize_libunwind_frame (void);
+
+void
+_initialize_libunwind_frame (void)
+{
+  libunwind_descr_handle
+    = gdbarch_data_register_post_init (libunwind_descr_init);
+
+  libunwind_initialized = libunwind_load ();
+}