Merge GDB 7.5.1

gdb/libunwind-frame.c

Index: gdb/libunwind-frame.c
diff --git a/gdb/libunwind-frame.c b/gdb/libunwind-frame.c
deleted file mode 100644
index 94449b0c698d0dc5678f6f4a82833a3919665b3d..0000000000000000000000000000000000000000
--- a/gdb/libunwind-frame.c
+++ /dev/null
@@ -1,574 +0,0 @@
-/* Frame unwinder for 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 "libunwind-frame.h"
-
-#include "complaints.h"
-
-/* 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.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);
-}
-
-static const struct frame_unwind libunwind_frame_unwind =
-{
-  NORMAL_FRAME,
-  default_frame_unwind_stop_reason,
-  libunwind_frame_this_id,
-  libunwind_frame_prev_register,
-  NULL,
-  libunwind_frame_sniffer,
-  libunwind_frame_dealloc_cache,
-};
-
-/* 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;
-} 
-
-CORE_ADDR
-libunwind_frame_base_address (struct frame_info *this_frame, void **this_cache)
-{
-  struct libunwind_frame_cache *cache =
-    libunwind_frame_cache (this_frame, this_cache);
-
-  if (cache == NULL)
-    return (CORE_ADDR)NULL;
-  return cache->base;
-}
-
-/* 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;
-
-  handle = dlopen (LIBUNWIND_SO, RTLD_NOW);
-  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 ();
-}