/* Frame unwinder for frames using the libunwind library.
- Copyright 2003 Free Software Foundation, Inc.
+ Copyright (C) 2003, 2004, 2006, 2007 Free Software Foundation, Inc.
Written by Jeff Johnston, contributed by Red Hat Inc.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA. */
+ Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ Boston, MA 02110-1301, USA. */
#include "defs.h"
static int libunwind_initialized;
static struct gdbarch_data *libunwind_descr_handle;
-#ifndef LIBUNWIND_SO
-#define LIBUNWIND_SO "libunwind.so"
-#endif
-
/* 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);
#define STRINGIFY2(name) #name
#define STRINGIFY(name) STRINGIFY2(name)
+#ifndef LIBUNWIND_SO
+#define LIBUNWIND_SO "libunwind-" STRINGIFY(UNW_TARGET) ".so"
+#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));
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 *
cache = FRAME_OBSTACK_ZALLOC (struct libunwind_frame_cache);
cache->func_addr = frame_func_unwind (next_frame);
+ if (cache->func_addr == 0
+ && frame_relative_level (next_frame) > 0
+ && get_frame_type (next_frame) != SIGTRAMP_FRAME)
+ return NULL;
/* 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
: __LITTLE_ENDIAN);
unw_init_remote_p (&cache->cursor, as, next_frame);
- unw_step_p (&cache->cursor);
+ if (unw_step_p (&cache->cursor) < 0)
+ return NULL;
/* To get base address, get sp from previous frame. */
uw_sp_regnum = descr->gdb2uw (SP_REGNUM);
ret = unw_get_reg_p (&cache->cursor, uw_sp_regnum, &fp);
if (ret < 0)
- error ("Can't get libunwind sp register.");
+ error (_("Can't get libunwind sp register."));
cache->base = (CORE_ADDR)fp;
ret = unw_init_remote_p (&cursor, as, next_frame);
- if (ret >= 0)
- ret = unw_step_p (&cursor);
+ if (ret < 0)
+ return NULL;
+
+
+ /* 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);
if (ret < 0)
return NULL;
struct libunwind_frame_cache *cache =
libunwind_frame_cache (next_frame, this_cache);
- (*this_id) = frame_id_build (cache->base, cache->func_addr);
+ if (cache != NULL)
+ (*this_id) = frame_id_build (cache->base, cache->func_addr);
+ else
+ (*this_id) = null_frame_id;
}
void
libunwind_frame_prev_register (struct frame_info *next_frame, void **this_cache,
int regnum, int *optimizedp,
enum lval_type *lvalp, CORE_ADDR *addrp,
- int *realnump, void *valuep)
+ int *realnump, gdb_byte *valuep)
{
struct libunwind_frame_cache *cache =
libunwind_frame_cache (next_frame, this_cache);
unw_regnum_t uw_regnum;
struct libunwind_descr *descr;
+ if (cache == NULL)
+ return;
+
/* Convert from gdb register number to libunwind register number. */
descr = libunwind_descr (get_frame_arch (next_frame));
uw_regnum = descr->gdb2uw (regnum);
gdb_assert (regnum >= 0);
if (!target_has_registers)
- error ("No registers.");
+ error (_("No registers."));
*optimizedp = 0;
*addrp = 0;
*lvalp = not_lval;
*realnump = -1;
- memset (valuep, 0, register_size (current_gdbarch, regnum));
+ if (valuep)
+ memset (valuep, 0, register_size (current_gdbarch, regnum));
if (uw_regnum < 0)
return;
if (ret < 0)
return;
- memcpy (valuep, ptr, register_size (current_gdbarch, regnum));
+ if (valuep)
+ memcpy (valuep, ptr, register_size (current_gdbarch, regnum));
if (unw_get_saveloc_p (&cache->cursor, uw_regnum, &sl) < 0)
return;
struct libunwind_frame_cache *cache =
libunwind_frame_cache (next_frame, this_cache);
+ if (cache == NULL)
+ return (CORE_ADDR)NULL;
return cache->base;
}
di, pi, need_unwind_info, args);
}
+/* Verify if we are in a sigtramp frame and we can use libunwind to unwind. */
+const struct frame_unwind *
+libunwind_sigtramp_frame_sniffer (struct frame_info *next_frame)
+{
+ unw_cursor_t cursor;
+ unw_accessors_t *acc;
+ unw_addr_space_t as;
+ struct libunwind_descr *descr;
+ 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 (get_frame_arch (next_frame));
+ acc = descr->accessors;
+ as = unw_create_addr_space_p (acc,
+ TARGET_BYTE_ORDER == BFD_ENDIAN_BIG
+ ? __BIG_ENDIAN
+ : __LITTLE_ENDIAN);
+
+ ret = unw_init_remote_p (&cursor, as, next_frame);
+
+ if (ret < 0)
+ return NULL;
+
+ /* Check to see if we are in a signal frame. */
+ ret = unw_is_signal_frame_p (&cursor);
+ if (ret > 0)
+ return &libunwind_frame_unwind;
+
+ return NULL;
+}
+
+/* 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, 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,
+ TARGET_BYTE_ORDER == BFD_ENDIAN_BIG
+ ? __BIG_ENDIAN
+ : __LITTLE_ENDIAN);
+
+ ret = unw_init_remote_p (&cursor, as, NULL);
+ if (ret < 0)
+ 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;
+ }
+
+ if (ret < 0)
+ return -1;
+
+ if (buf)
+ memcpy (buf, ptr, register_size (current_gdbarch, regnum));
+
+ return 0;
+}
+
static int
libunwind_load (void)
{
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;
projects / deliverable / binutils-gdb.git / blobdiff