/* Frame unwinder for frames using the libunwind library.
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/* Frame unwinder for frames using the libunwind library.
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Copyright (C) 2003, 2004, 2006, 2007, 2008, 2009, 2010
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Copyright (C) 2003, 2004, 2006, 2007, 2008, 2009, 2010
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Free Software Foundation, Inc.
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Free Software Foundation, Inc.
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Written by Jeff Johnston, contributed by Red Hat Inc.
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Written by Jeff Johnston, contributed by Red Hat Inc.
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This file is part of GDB.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "defs.h"
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#include "inferior.h"
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#include "inferior.h"
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#include "frame.h"
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#include "frame.h"
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#include "frame-base.h"
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#include "frame-base.h"
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#include "frame-unwind.h"
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#include "frame-unwind.h"
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#include "gdbcore.h"
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#include "gdbcore.h"
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#include "gdbtypes.h"
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#include "gdbtypes.h"
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#include "symtab.h"
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#include "symtab.h"
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#include "objfiles.h"
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#include "objfiles.h"
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#include "regcache.h"
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#include "regcache.h"
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#include <dlfcn.h>
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#include <dlfcn.h>
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#include "gdb_assert.h"
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#include "gdb_assert.h"
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#include "gdb_string.h"
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#include "gdb_string.h"
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#include "libunwind-frame.h"
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#include "libunwind-frame.h"
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#include "complaints.h"
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#include "complaints.h"
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static int libunwind_initialized;
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static int libunwind_initialized;
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static struct gdbarch_data *libunwind_descr_handle;
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static struct gdbarch_data *libunwind_descr_handle;
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/* Required function pointers from libunwind. */
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/* Required function pointers from libunwind. */
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static int (*unw_get_reg_p) (unw_cursor_t *, unw_regnum_t, unw_word_t *);
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static int (*unw_get_reg_p) (unw_cursor_t *, unw_regnum_t, unw_word_t *);
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static int (*unw_get_fpreg_p) (unw_cursor_t *, unw_regnum_t, unw_fpreg_t *);
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static int (*unw_get_fpreg_p) (unw_cursor_t *, unw_regnum_t, unw_fpreg_t *);
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static int (*unw_get_saveloc_p) (unw_cursor_t *, unw_regnum_t, unw_save_loc_t *);
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static int (*unw_get_saveloc_p) (unw_cursor_t *, unw_regnum_t, unw_save_loc_t *);
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static int (*unw_is_signal_frame_p) (unw_cursor_t *);
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static int (*unw_is_signal_frame_p) (unw_cursor_t *);
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static int (*unw_step_p) (unw_cursor_t *);
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static int (*unw_step_p) (unw_cursor_t *);
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static int (*unw_init_remote_p) (unw_cursor_t *, unw_addr_space_t, void *);
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static int (*unw_init_remote_p) (unw_cursor_t *, unw_addr_space_t, void *);
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static unw_addr_space_t (*unw_create_addr_space_p) (unw_accessors_t *, int);
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static unw_addr_space_t (*unw_create_addr_space_p) (unw_accessors_t *, int);
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static void (*unw_destroy_addr_space_p) (unw_addr_space_t);
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static void (*unw_destroy_addr_space_p) (unw_addr_space_t);
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static int (*unw_search_unwind_table_p) (unw_addr_space_t, unw_word_t, unw_dyn_info_t *,
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static int (*unw_search_unwind_table_p) (unw_addr_space_t, unw_word_t, unw_dyn_info_t *,
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unw_proc_info_t *, int, void *);
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unw_proc_info_t *, int, void *);
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static unw_word_t (*unw_find_dyn_list_p) (unw_addr_space_t, unw_dyn_info_t *,
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static unw_word_t (*unw_find_dyn_list_p) (unw_addr_space_t, unw_dyn_info_t *,
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void *);
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void *);
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struct libunwind_frame_cache
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struct libunwind_frame_cache
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{
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{
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CORE_ADDR base;
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CORE_ADDR base;
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CORE_ADDR func_addr;
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CORE_ADDR func_addr;
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unw_cursor_t cursor;
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unw_cursor_t cursor;
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unw_addr_space_t as;
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unw_addr_space_t as;
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};
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};
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/* We need to qualify the function names with a platform-specific prefix
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/* We need to qualify the function names with a platform-specific prefix
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to match the names used by the libunwind library. The UNW_OBJ macro is
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to match the names used by the libunwind library. The UNW_OBJ macro is
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provided by the libunwind.h header file. */
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provided by the libunwind.h header file. */
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#define STRINGIFY2(name) #name
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#define STRINGIFY2(name) #name
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#define STRINGIFY(name) STRINGIFY2(name)
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#define STRINGIFY(name) STRINGIFY2(name)
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#ifndef LIBUNWIND_SO
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#ifndef LIBUNWIND_SO
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/* Use the stable ABI major version number. `libunwind-ia64.so' is a link time
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/* Use the stable ABI major version number. `libunwind-ia64.so' is a link time
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only library, not a runtime one. */
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only library, not a runtime one. */
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#define LIBUNWIND_SO "libunwind-" STRINGIFY(UNW_TARGET) ".so.7"
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#define LIBUNWIND_SO "libunwind-" STRINGIFY(UNW_TARGET) ".so.7"
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#endif
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#endif
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static char *get_reg_name = STRINGIFY(UNW_OBJ(get_reg));
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static char *get_reg_name = STRINGIFY(UNW_OBJ(get_reg));
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static char *get_fpreg_name = STRINGIFY(UNW_OBJ(get_fpreg));
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static char *get_fpreg_name = STRINGIFY(UNW_OBJ(get_fpreg));
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static char *get_saveloc_name = STRINGIFY(UNW_OBJ(get_save_loc));
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static char *get_saveloc_name = STRINGIFY(UNW_OBJ(get_save_loc));
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static char *is_signal_frame_name = STRINGIFY(UNW_OBJ(is_signal_frame));
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static char *is_signal_frame_name = STRINGIFY(UNW_OBJ(is_signal_frame));
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static char *step_name = STRINGIFY(UNW_OBJ(step));
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static char *step_name = STRINGIFY(UNW_OBJ(step));
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static char *init_remote_name = STRINGIFY(UNW_OBJ(init_remote));
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static char *init_remote_name = STRINGIFY(UNW_OBJ(init_remote));
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static char *create_addr_space_name = STRINGIFY(UNW_OBJ(create_addr_space));
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static char *create_addr_space_name = STRINGIFY(UNW_OBJ(create_addr_space));
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static char *destroy_addr_space_name = STRINGIFY(UNW_OBJ(destroy_addr_space));
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static char *destroy_addr_space_name = STRINGIFY(UNW_OBJ(destroy_addr_space));
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static char *search_unwind_table_name = STRINGIFY(UNW_OBJ(search_unwind_table));
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static char *search_unwind_table_name = STRINGIFY(UNW_OBJ(search_unwind_table));
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static char *find_dyn_list_name = STRINGIFY(UNW_OBJ(find_dyn_list));
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static char *find_dyn_list_name = STRINGIFY(UNW_OBJ(find_dyn_list));
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static struct libunwind_descr *
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static struct libunwind_descr *
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libunwind_descr (struct gdbarch *gdbarch)
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libunwind_descr (struct gdbarch *gdbarch)
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{
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{
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return gdbarch_data (gdbarch, libunwind_descr_handle);
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return gdbarch_data (gdbarch, libunwind_descr_handle);
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}
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}
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static void *
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static void *
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libunwind_descr_init (struct gdbarch *gdbarch)
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libunwind_descr_init (struct gdbarch *gdbarch)
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{
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{
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struct libunwind_descr *descr = GDBARCH_OBSTACK_ZALLOC (gdbarch,
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struct libunwind_descr *descr = GDBARCH_OBSTACK_ZALLOC (gdbarch,
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struct libunwind_descr);
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struct libunwind_descr);
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return descr;
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return descr;
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}
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}
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void
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void
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libunwind_frame_set_descr (struct gdbarch *gdbarch, struct libunwind_descr *descr)
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libunwind_frame_set_descr (struct gdbarch *gdbarch, struct libunwind_descr *descr)
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{
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{
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struct libunwind_descr *arch_descr;
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struct libunwind_descr *arch_descr;
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gdb_assert (gdbarch != NULL);
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gdb_assert (gdbarch != NULL);
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arch_descr = gdbarch_data (gdbarch, libunwind_descr_handle);
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arch_descr = gdbarch_data (gdbarch, libunwind_descr_handle);
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if (arch_descr == NULL)
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if (arch_descr == NULL)
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{
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{
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/* First time here. Must initialize data area. */
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/* First time here. Must initialize data area. */
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arch_descr = libunwind_descr_init (gdbarch);
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arch_descr = libunwind_descr_init (gdbarch);
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deprecated_set_gdbarch_data (gdbarch, libunwind_descr_handle, arch_descr);
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deprecated_set_gdbarch_data (gdbarch, libunwind_descr_handle, arch_descr);
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}
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}
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/* Copy new descriptor info into arch descriptor. */
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/* Copy new descriptor info into arch descriptor. */
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arch_descr->gdb2uw = descr->gdb2uw;
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arch_descr->gdb2uw = descr->gdb2uw;
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arch_descr->uw2gdb = descr->uw2gdb;
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arch_descr->uw2gdb = descr->uw2gdb;
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arch_descr->is_fpreg = descr->is_fpreg;
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arch_descr->is_fpreg = descr->is_fpreg;
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arch_descr->accessors = descr->accessors;
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arch_descr->accessors = descr->accessors;
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arch_descr->special_accessors = descr->special_accessors;
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arch_descr->special_accessors = descr->special_accessors;
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}
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}
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static struct libunwind_frame_cache *
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static struct libunwind_frame_cache *
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libunwind_frame_cache (struct frame_info *this_frame, void **this_cache)
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libunwind_frame_cache (struct frame_info *this_frame, void **this_cache)
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{
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{
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unw_accessors_t *acc;
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unw_accessors_t *acc;
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unw_addr_space_t as;
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unw_addr_space_t as;
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unw_word_t fp;
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unw_word_t fp;
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unw_regnum_t uw_sp_regnum;
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unw_regnum_t uw_sp_regnum;
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struct libunwind_frame_cache *cache;
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struct libunwind_frame_cache *cache;
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struct libunwind_descr *descr;
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struct libunwind_descr *descr;
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struct gdbarch *gdbarch = get_frame_arch (this_frame);
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struct gdbarch *gdbarch = get_frame_arch (this_frame);
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int i, ret;
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int i, ret;
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if (*this_cache)
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if (*this_cache)
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return *this_cache;
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return *this_cache;
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/* Allocate a new cache. */
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/* Allocate a new cache. */
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cache = FRAME_OBSTACK_ZALLOC (struct libunwind_frame_cache);
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cache = FRAME_OBSTACK_ZALLOC (struct libunwind_frame_cache);
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/* We can assume we are unwinding a normal frame. Even if this is
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/* We can assume we are unwinding a normal frame. Even if this is
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for a signal trampoline, ia64 signal "trampolines" use a normal
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for a signal trampoline, ia64 signal "trampolines" use a normal
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subroutine call to start the signal handler. */
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subroutine call to start the signal handler. */
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cache->func_addr = get_frame_func (this_frame);
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cache->func_addr = get_frame_func (this_frame);
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if (cache->func_addr == 0
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if (cache->func_addr == 0
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&& get_next_frame (this_frame)
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&& get_next_frame (this_frame)
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&& get_frame_type (get_next_frame (this_frame)) == NORMAL_FRAME)
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&& get_frame_type (get_next_frame (this_frame)) == NORMAL_FRAME)
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return NULL;
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return NULL;
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/* Get a libunwind cursor to the previous frame.
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/* Get a libunwind cursor to the previous frame.
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We do this by initializing a cursor. Libunwind treats a new cursor
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We do this by initializing a cursor. Libunwind treats a new cursor
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as the top of stack and will get the current register set via the
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as the top of stack and will get the current register set via the
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libunwind register accessor. Now, we provide the platform-specific
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libunwind register accessor. Now, we provide the platform-specific
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accessors and we set up the register accessor to use the frame
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accessors and we set up the register accessor to use the frame
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register unwinding interfaces so that we properly get the registers
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register unwinding interfaces so that we properly get the registers
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for the current frame rather than the top. We then use the unw_step
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for the current frame rather than the top. We then use the unw_step
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function to move the libunwind cursor back one frame. We can later
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function to move the libunwind cursor back one frame. We can later
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use this cursor to find previous registers via the unw_get_reg
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use this cursor to find previous registers via the unw_get_reg
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interface which will invoke libunwind's special logic. */
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interface which will invoke libunwind's special logic. */
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descr = libunwind_descr (gdbarch);
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descr = libunwind_descr (gdbarch);
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acc = descr->accessors;
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acc = descr->accessors;
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as = unw_create_addr_space_p (acc,
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as = unw_create_addr_space_p (acc,
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gdbarch_byte_order (gdbarch)
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gdbarch_byte_order (gdbarch)
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== BFD_ENDIAN_BIG
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== BFD_ENDIAN_BIG
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? __BIG_ENDIAN
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? __BIG_ENDIAN
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: __LITTLE_ENDIAN);
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: __LITTLE_ENDIAN);
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unw_init_remote_p (&cache->cursor, as, this_frame);
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unw_init_remote_p (&cache->cursor, as, this_frame);
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if (unw_step_p (&cache->cursor) < 0)
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if (unw_step_p (&cache->cursor) < 0)
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{
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{
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unw_destroy_addr_space_p (as);
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unw_destroy_addr_space_p (as);
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return NULL;
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return NULL;
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}
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}
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/* To get base address, get sp from previous frame. */
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/* To get base address, get sp from previous frame. */
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uw_sp_regnum = descr->gdb2uw (gdbarch_sp_regnum (gdbarch));
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uw_sp_regnum = descr->gdb2uw (gdbarch_sp_regnum (gdbarch));
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ret = unw_get_reg_p (&cache->cursor, uw_sp_regnum, &fp);
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ret = unw_get_reg_p (&cache->cursor, uw_sp_regnum, &fp);
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if (ret < 0)
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if (ret < 0)
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{
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{
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unw_destroy_addr_space_p (as);
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unw_destroy_addr_space_p (as);
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error (_("Can't get libunwind sp register."));
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error (_("Can't get libunwind sp register."));
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}
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}
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cache->base = (CORE_ADDR)fp;
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cache->base = (CORE_ADDR)fp;
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cache->as = as;
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cache->as = as;
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*this_cache = cache;
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*this_cache = cache;
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return cache;
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return cache;
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}
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}
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void
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void
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libunwind_frame_dealloc_cache (struct frame_info *self, void *this_cache)
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libunwind_frame_dealloc_cache (struct frame_info *self, void *this_cache)
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{
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{
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struct libunwind_frame_cache *cache = this_cache;
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struct libunwind_frame_cache *cache = this_cache;
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if (cache->as)
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if (cache->as)
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unw_destroy_addr_space_p (cache->as);
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unw_destroy_addr_space_p (cache->as);
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}
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}
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unw_word_t
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unw_word_t
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libunwind_find_dyn_list (unw_addr_space_t as, unw_dyn_info_t *di, void *arg)
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libunwind_find_dyn_list (unw_addr_space_t as, unw_dyn_info_t *di, void *arg)
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{
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{
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return unw_find_dyn_list_p (as, di, arg);
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return unw_find_dyn_list_p (as, di, arg);
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}
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}
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static const struct frame_unwind libunwind_frame_unwind =
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static const struct frame_unwind libunwind_frame_unwind =
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{
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{
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NORMAL_FRAME,
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NORMAL_FRAME,
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libunwind_frame_this_id,
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libunwind_frame_this_id,
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libunwind_frame_prev_register,
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libunwind_frame_prev_register,
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NULL,
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NULL,
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libunwind_frame_sniffer,
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libunwind_frame_sniffer,
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libunwind_frame_dealloc_cache,
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libunwind_frame_dealloc_cache,
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};
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};
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/* Verify if there is sufficient libunwind information for the frame to use
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/* Verify if there is sufficient libunwind information for the frame to use
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libunwind frame unwinding. */
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libunwind frame unwinding. */
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int
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int
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libunwind_frame_sniffer (const struct frame_unwind *self,
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libunwind_frame_sniffer (const struct frame_unwind *self,
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struct frame_info *this_frame, void **this_cache)
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struct frame_info *this_frame, void **this_cache)
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{
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{
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unw_cursor_t cursor;
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unw_cursor_t cursor;
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unw_accessors_t *acc;
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unw_accessors_t *acc;
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unw_addr_space_t as;
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unw_addr_space_t as;
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struct libunwind_descr *descr;
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struct libunwind_descr *descr;
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struct gdbarch *gdbarch = get_frame_arch (this_frame);
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struct gdbarch *gdbarch = get_frame_arch (this_frame);
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int i, ret;
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int i, ret;
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/* To test for libunwind unwind support, initialize a cursor to
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/* To test for libunwind unwind support, initialize a cursor to
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the current frame and try to back up. We use this same method
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the current frame and try to back up. We use this same method
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when setting up the frame cache (see libunwind_frame_cache()).
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when setting up the frame cache (see libunwind_frame_cache()).
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If libunwind returns success for this operation, it means that
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If libunwind returns success for this operation, it means that
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it has found sufficient libunwind unwinding information to do so. */
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it has found sufficient libunwind unwinding information to do so. */
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descr = libunwind_descr (gdbarch);
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descr = libunwind_descr (gdbarch);
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acc = descr->accessors;
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acc = descr->accessors;
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as = unw_create_addr_space_p (acc,
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as = unw_create_addr_space_p (acc,
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gdbarch_byte_order (gdbarch)
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gdbarch_byte_order (gdbarch)
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== BFD_ENDIAN_BIG
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== BFD_ENDIAN_BIG
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? __BIG_ENDIAN
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? __BIG_ENDIAN
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: __LITTLE_ENDIAN);
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: __LITTLE_ENDIAN);
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ret = unw_init_remote_p (&cursor, as, this_frame);
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ret = unw_init_remote_p (&cursor, as, this_frame);
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|
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if (ret < 0)
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if (ret < 0)
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{
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{
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unw_destroy_addr_space_p (as);
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unw_destroy_addr_space_p (as);
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return 0;
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return 0;
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}
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}
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/* Check to see if we have libunwind info by checking if we are in a
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/* Check to see if we have libunwind info by checking if we are in a
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signal frame. If it doesn't return an error, we have libunwind info
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signal frame. If it doesn't return an error, we have libunwind info
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and can use libunwind. */
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and can use libunwind. */
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ret = unw_is_signal_frame_p (&cursor);
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ret = unw_is_signal_frame_p (&cursor);
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unw_destroy_addr_space_p (as);
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unw_destroy_addr_space_p (as);
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if (ret < 0)
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if (ret < 0)
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return 0;
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return 0;
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|
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return 1;
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return 1;
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}
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}
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|
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void
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void
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libunwind_frame_this_id (struct frame_info *this_frame, void **this_cache,
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libunwind_frame_this_id (struct frame_info *this_frame, void **this_cache,
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struct frame_id *this_id)
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struct frame_id *this_id)
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{
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{
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struct libunwind_frame_cache *cache =
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struct libunwind_frame_cache *cache =
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libunwind_frame_cache (this_frame, this_cache);
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libunwind_frame_cache (this_frame, this_cache);
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|
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if (cache != NULL)
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if (cache != NULL)
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(*this_id) = frame_id_build (cache->base, cache->func_addr);
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(*this_id) = frame_id_build (cache->base, cache->func_addr);
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}
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}
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struct value *
|
struct value *
|
libunwind_frame_prev_register (struct frame_info *this_frame,
|
libunwind_frame_prev_register (struct frame_info *this_frame,
|
void **this_cache, int regnum)
|
void **this_cache, int regnum)
|
{
|
{
|
struct libunwind_frame_cache *cache =
|
struct libunwind_frame_cache *cache =
|
libunwind_frame_cache (this_frame, this_cache);
|
libunwind_frame_cache (this_frame, this_cache);
|
struct gdbarch *gdbarch = get_frame_arch (this_frame);
|
struct gdbarch *gdbarch = get_frame_arch (this_frame);
|
|
|
void *ptr;
|
void *ptr;
|
unw_cursor_t *c;
|
unw_cursor_t *c;
|
unw_save_loc_t sl;
|
unw_save_loc_t sl;
|
int i, ret;
|
int i, ret;
|
unw_word_t intval;
|
unw_word_t intval;
|
unw_fpreg_t fpval;
|
unw_fpreg_t fpval;
|
unw_regnum_t uw_regnum;
|
unw_regnum_t uw_regnum;
|
struct libunwind_descr *descr;
|
struct libunwind_descr *descr;
|
struct value *val = NULL;
|
struct value *val = NULL;
|
|
|
if (cache == NULL)
|
if (cache == NULL)
|
return frame_unwind_got_constant (this_frame, regnum, 0);
|
return frame_unwind_got_constant (this_frame, regnum, 0);
|
|
|
/* Convert from gdb register number to libunwind register number. */
|
/* Convert from gdb register number to libunwind register number. */
|
descr = libunwind_descr (get_frame_arch (this_frame));
|
descr = libunwind_descr (get_frame_arch (this_frame));
|
uw_regnum = descr->gdb2uw (regnum);
|
uw_regnum = descr->gdb2uw (regnum);
|
|
|
gdb_assert (regnum >= 0);
|
gdb_assert (regnum >= 0);
|
|
|
if (!target_has_registers)
|
if (!target_has_registers)
|
error (_("No registers."));
|
error (_("No registers."));
|
|
|
if (uw_regnum < 0)
|
if (uw_regnum < 0)
|
return frame_unwind_got_constant (this_frame, regnum, 0);
|
return frame_unwind_got_constant (this_frame, regnum, 0);
|
|
|
if (unw_get_saveloc_p (&cache->cursor, uw_regnum, &sl) < 0)
|
if (unw_get_saveloc_p (&cache->cursor, uw_regnum, &sl) < 0)
|
return frame_unwind_got_constant (this_frame, regnum, 0);
|
return frame_unwind_got_constant (this_frame, regnum, 0);
|
|
|
switch (sl.type)
|
switch (sl.type)
|
{
|
{
|
case UNW_SLT_MEMORY:
|
case UNW_SLT_MEMORY:
|
val = frame_unwind_got_memory (this_frame, regnum, sl.u.addr);
|
val = frame_unwind_got_memory (this_frame, regnum, sl.u.addr);
|
break;
|
break;
|
|
|
case UNW_SLT_REG:
|
case UNW_SLT_REG:
|
val = frame_unwind_got_register (this_frame, regnum,
|
val = frame_unwind_got_register (this_frame, regnum,
|
descr->uw2gdb (sl.u.regnum));
|
descr->uw2gdb (sl.u.regnum));
|
break;
|
break;
|
case UNW_SLT_NONE:
|
case UNW_SLT_NONE:
|
{
|
{
|
/* The register is not stored at a specific memory address nor
|
/* The register is not stored at a specific memory address nor
|
inside another register. So use libunwind to fetch the register
|
inside another register. So use libunwind to fetch the register
|
value for us, and create a constant value with the result. */
|
value for us, and create a constant value with the result. */
|
if (descr->is_fpreg (uw_regnum))
|
if (descr->is_fpreg (uw_regnum))
|
{
|
{
|
ret = unw_get_fpreg_p (&cache->cursor, uw_regnum, &fpval);
|
ret = unw_get_fpreg_p (&cache->cursor, uw_regnum, &fpval);
|
if (ret < 0)
|
if (ret < 0)
|
return frame_unwind_got_constant (this_frame, regnum, 0);
|
return frame_unwind_got_constant (this_frame, regnum, 0);
|
val = frame_unwind_got_bytes (this_frame, regnum,
|
val = frame_unwind_got_bytes (this_frame, regnum,
|
(gdb_byte *) &fpval);
|
(gdb_byte *) &fpval);
|
}
|
}
|
else
|
else
|
{
|
{
|
ret = unw_get_reg_p (&cache->cursor, uw_regnum, &intval);
|
ret = unw_get_reg_p (&cache->cursor, uw_regnum, &intval);
|
if (ret < 0)
|
if (ret < 0)
|
return frame_unwind_got_constant (this_frame, regnum, 0);
|
return frame_unwind_got_constant (this_frame, regnum, 0);
|
val = frame_unwind_got_constant (this_frame, regnum, intval);
|
val = frame_unwind_got_constant (this_frame, regnum, intval);
|
}
|
}
|
set_value_optimized_out (val, 1);
|
set_value_optimized_out (val, 1);
|
break;
|
break;
|
}
|
}
|
}
|
}
|
|
|
return val;
|
return val;
|
}
|
}
|
|
|
CORE_ADDR
|
CORE_ADDR
|
libunwind_frame_base_address (struct frame_info *this_frame, void **this_cache)
|
libunwind_frame_base_address (struct frame_info *this_frame, void **this_cache)
|
{
|
{
|
struct libunwind_frame_cache *cache =
|
struct libunwind_frame_cache *cache =
|
libunwind_frame_cache (this_frame, this_cache);
|
libunwind_frame_cache (this_frame, this_cache);
|
|
|
if (cache == NULL)
|
if (cache == NULL)
|
return (CORE_ADDR)NULL;
|
return (CORE_ADDR)NULL;
|
return cache->base;
|
return cache->base;
|
}
|
}
|
|
|
/* The following is a glue routine to call the libunwind unwind table
|
/* The following is a glue routine to call the libunwind unwind table
|
search function to get unwind information for a specified ip address. */
|
search function to get unwind information for a specified ip address. */
|
int
|
int
|
libunwind_search_unwind_table (void *as, long ip, void *di,
|
libunwind_search_unwind_table (void *as, long ip, void *di,
|
void *pi, int need_unwind_info, void *args)
|
void *pi, int need_unwind_info, void *args)
|
{
|
{
|
return unw_search_unwind_table_p (*(unw_addr_space_t *)as, (unw_word_t )ip,
|
return unw_search_unwind_table_p (*(unw_addr_space_t *)as, (unw_word_t )ip,
|
di, pi, need_unwind_info, args);
|
di, pi, need_unwind_info, args);
|
}
|
}
|
|
|
/* Verify if we are in a sigtramp frame and we can use libunwind to unwind. */
|
/* Verify if we are in a sigtramp frame and we can use libunwind to unwind. */
|
int
|
int
|
libunwind_sigtramp_frame_sniffer (const struct frame_unwind *self,
|
libunwind_sigtramp_frame_sniffer (const struct frame_unwind *self,
|
struct frame_info *this_frame,
|
struct frame_info *this_frame,
|
void **this_cache)
|
void **this_cache)
|
{
|
{
|
unw_cursor_t cursor;
|
unw_cursor_t cursor;
|
unw_accessors_t *acc;
|
unw_accessors_t *acc;
|
unw_addr_space_t as;
|
unw_addr_space_t as;
|
struct libunwind_descr *descr;
|
struct libunwind_descr *descr;
|
struct gdbarch *gdbarch = get_frame_arch (this_frame);
|
struct gdbarch *gdbarch = get_frame_arch (this_frame);
|
int i, ret;
|
int i, ret;
|
|
|
/* To test for libunwind unwind support, initialize a cursor to the
|
/* To test for libunwind unwind support, initialize a cursor to the
|
current frame and try to back up. We use this same method when
|
current frame and try to back up. We use this same method when
|
setting up the frame cache (see libunwind_frame_cache()). If
|
setting up the frame cache (see libunwind_frame_cache()). If
|
libunwind returns success for this operation, it means that it
|
libunwind returns success for this operation, it means that it
|
has found sufficient libunwind unwinding information to do
|
has found sufficient libunwind unwinding information to do
|
so. */
|
so. */
|
|
|
descr = libunwind_descr (gdbarch);
|
descr = libunwind_descr (gdbarch);
|
acc = descr->accessors;
|
acc = descr->accessors;
|
as = unw_create_addr_space_p (acc,
|
as = unw_create_addr_space_p (acc,
|
gdbarch_byte_order (gdbarch)
|
gdbarch_byte_order (gdbarch)
|
== BFD_ENDIAN_BIG
|
== BFD_ENDIAN_BIG
|
? __BIG_ENDIAN
|
? __BIG_ENDIAN
|
: __LITTLE_ENDIAN);
|
: __LITTLE_ENDIAN);
|
|
|
ret = unw_init_remote_p (&cursor, as, this_frame);
|
ret = unw_init_remote_p (&cursor, as, this_frame);
|
|
|
if (ret < 0)
|
if (ret < 0)
|
{
|
{
|
unw_destroy_addr_space_p (as);
|
unw_destroy_addr_space_p (as);
|
return 0;
|
return 0;
|
}
|
}
|
|
|
/* Check to see if we are in a signal frame. */
|
/* Check to see if we are in a signal frame. */
|
ret = unw_is_signal_frame_p (&cursor);
|
ret = unw_is_signal_frame_p (&cursor);
|
unw_destroy_addr_space_p (as);
|
unw_destroy_addr_space_p (as);
|
if (ret > 0)
|
if (ret > 0)
|
return 1;
|
return 1;
|
|
|
return 0;
|
return 0;
|
}
|
}
|
|
|
/* The following routine is for accessing special registers of the top frame.
|
/* 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.
|
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
|
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
|
are usually located at BOF, this is not always true and only the libunwind
|
info can decipher where they actually are. */
|
info can decipher where they actually are. */
|
int
|
int
|
libunwind_get_reg_special (struct gdbarch *gdbarch, struct regcache *regcache,
|
libunwind_get_reg_special (struct gdbarch *gdbarch, struct regcache *regcache,
|
int regnum, void *buf)
|
int regnum, void *buf)
|
{
|
{
|
unw_cursor_t cursor;
|
unw_cursor_t cursor;
|
unw_accessors_t *acc;
|
unw_accessors_t *acc;
|
unw_addr_space_t as;
|
unw_addr_space_t as;
|
struct libunwind_descr *descr;
|
struct libunwind_descr *descr;
|
int ret;
|
int ret;
|
unw_regnum_t uw_regnum;
|
unw_regnum_t uw_regnum;
|
unw_word_t intval;
|
unw_word_t intval;
|
unw_fpreg_t fpval;
|
unw_fpreg_t fpval;
|
void *ptr;
|
void *ptr;
|
|
|
|
|
descr = libunwind_descr (gdbarch);
|
descr = libunwind_descr (gdbarch);
|
acc = descr->special_accessors;
|
acc = descr->special_accessors;
|
as = unw_create_addr_space_p (acc,
|
as = unw_create_addr_space_p (acc,
|
gdbarch_byte_order (gdbarch)
|
gdbarch_byte_order (gdbarch)
|
== BFD_ENDIAN_BIG
|
== BFD_ENDIAN_BIG
|
? __BIG_ENDIAN
|
? __BIG_ENDIAN
|
: __LITTLE_ENDIAN);
|
: __LITTLE_ENDIAN);
|
|
|
ret = unw_init_remote_p (&cursor, as, regcache);
|
ret = unw_init_remote_p (&cursor, as, regcache);
|
if (ret < 0)
|
if (ret < 0)
|
{
|
{
|
unw_destroy_addr_space_p (as);
|
unw_destroy_addr_space_p (as);
|
return -1;
|
return -1;
|
}
|
}
|
|
|
uw_regnum = descr->gdb2uw (regnum);
|
uw_regnum = descr->gdb2uw (regnum);
|
|
|
if (descr->is_fpreg (uw_regnum))
|
if (descr->is_fpreg (uw_regnum))
|
{
|
{
|
ret = unw_get_fpreg_p (&cursor, uw_regnum, &fpval);
|
ret = unw_get_fpreg_p (&cursor, uw_regnum, &fpval);
|
ptr = &fpval;
|
ptr = &fpval;
|
}
|
}
|
else
|
else
|
{
|
{
|
ret = unw_get_reg_p (&cursor, uw_regnum, &intval);
|
ret = unw_get_reg_p (&cursor, uw_regnum, &intval);
|
ptr = &intval;
|
ptr = &intval;
|
}
|
}
|
|
|
unw_destroy_addr_space_p (as);
|
unw_destroy_addr_space_p (as);
|
|
|
if (ret < 0)
|
if (ret < 0)
|
return -1;
|
return -1;
|
|
|
if (buf)
|
if (buf)
|
memcpy (buf, ptr, register_size (gdbarch, regnum));
|
memcpy (buf, ptr, register_size (gdbarch, regnum));
|
|
|
return 0;
|
return 0;
|
}
|
}
|
|
|
static int
|
static int
|
libunwind_load (void)
|
libunwind_load (void)
|
{
|
{
|
void *handle;
|
void *handle;
|
|
|
handle = dlopen (LIBUNWIND_SO, RTLD_NOW);
|
handle = dlopen (LIBUNWIND_SO, RTLD_NOW);
|
if (handle == NULL)
|
if (handle == NULL)
|
return 0;
|
return 0;
|
|
|
/* Initialize pointers to the dynamic library functions we will use. */
|
/* Initialize pointers to the dynamic library functions we will use. */
|
|
|
unw_get_reg_p = dlsym (handle, get_reg_name);
|
unw_get_reg_p = dlsym (handle, get_reg_name);
|
if (unw_get_reg_p == NULL)
|
if (unw_get_reg_p == NULL)
|
return 0;
|
return 0;
|
|
|
unw_get_fpreg_p = dlsym (handle, get_fpreg_name);
|
unw_get_fpreg_p = dlsym (handle, get_fpreg_name);
|
if (unw_get_fpreg_p == NULL)
|
if (unw_get_fpreg_p == NULL)
|
return 0;
|
return 0;
|
|
|
unw_get_saveloc_p = dlsym (handle, get_saveloc_name);
|
unw_get_saveloc_p = dlsym (handle, get_saveloc_name);
|
if (unw_get_saveloc_p == NULL)
|
if (unw_get_saveloc_p == NULL)
|
return 0;
|
return 0;
|
|
|
unw_is_signal_frame_p = dlsym (handle, is_signal_frame_name);
|
unw_is_signal_frame_p = dlsym (handle, is_signal_frame_name);
|
if (unw_is_signal_frame_p == NULL)
|
if (unw_is_signal_frame_p == NULL)
|
return 0;
|
return 0;
|
|
|
unw_step_p = dlsym (handle, step_name);
|
unw_step_p = dlsym (handle, step_name);
|
if (unw_step_p == NULL)
|
if (unw_step_p == NULL)
|
return 0;
|
return 0;
|
|
|
unw_init_remote_p = dlsym (handle, init_remote_name);
|
unw_init_remote_p = dlsym (handle, init_remote_name);
|
if (unw_init_remote_p == NULL)
|
if (unw_init_remote_p == NULL)
|
return 0;
|
return 0;
|
|
|
unw_create_addr_space_p = dlsym (handle, create_addr_space_name);
|
unw_create_addr_space_p = dlsym (handle, create_addr_space_name);
|
if (unw_create_addr_space_p == NULL)
|
if (unw_create_addr_space_p == NULL)
|
return 0;
|
return 0;
|
|
|
unw_destroy_addr_space_p = dlsym (handle, destroy_addr_space_name);
|
unw_destroy_addr_space_p = dlsym (handle, destroy_addr_space_name);
|
if (unw_destroy_addr_space_p == NULL)
|
if (unw_destroy_addr_space_p == NULL)
|
return 0;
|
return 0;
|
|
|
unw_search_unwind_table_p = dlsym (handle, search_unwind_table_name);
|
unw_search_unwind_table_p = dlsym (handle, search_unwind_table_name);
|
if (unw_search_unwind_table_p == NULL)
|
if (unw_search_unwind_table_p == NULL)
|
return 0;
|
return 0;
|
|
|
unw_find_dyn_list_p = dlsym (handle, find_dyn_list_name);
|
unw_find_dyn_list_p = dlsym (handle, find_dyn_list_name);
|
if (unw_find_dyn_list_p == NULL)
|
if (unw_find_dyn_list_p == NULL)
|
return 0;
|
return 0;
|
|
|
return 1;
|
return 1;
|
}
|
}
|
|
|
int
|
int
|
libunwind_is_initialized (void)
|
libunwind_is_initialized (void)
|
{
|
{
|
return libunwind_initialized;
|
return libunwind_initialized;
|
}
|
}
|
|
|
/* Provide a prototype to silence -Wmissing-prototypes. */
|
/* Provide a prototype to silence -Wmissing-prototypes. */
|
void _initialize_libunwind_frame (void);
|
void _initialize_libunwind_frame (void);
|
|
|
void
|
void
|
_initialize_libunwind_frame (void)
|
_initialize_libunwind_frame (void)
|
{
|
{
|
libunwind_descr_handle = gdbarch_data_register_post_init (libunwind_descr_init);
|
libunwind_descr_handle = gdbarch_data_register_post_init (libunwind_descr_init);
|
|
|
libunwind_initialized = libunwind_load ();
|
libunwind_initialized = libunwind_load ();
|
}
|
}
|
|
|
