/* Frame unwinder for frames using the libunwind library.
- Copyright (C) 2003, 2004, 2006, 2007 Free Software Foundation, Inc.
+ Copyright (C) 2003-2004, 2006-2012 Free Software Foundation, Inc.
Written by Jeff Johnston, contributed by Red Hat Inc.
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 2 of the License, or
+ 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,
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, write to the Free Software
- Foundation, Inc., 51 Franklin Street, Fifth Floor,
- Boston, MA 02110-1301, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.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_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 int (*unw_search_unwind_table_p) (unw_addr_space_t, unw_word_t, unw_dyn_info_t *,
+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 *);
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. */
+/* 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)
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 *search_unwind_table_name = STRINGIFY(UNW_OBJ(search_unwind_table));
+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 *
static void *
libunwind_descr_init (struct gdbarch *gdbarch)
{
- struct libunwind_descr *descr = GDBARCH_OBSTACK_ZALLOC (gdbarch,
- struct libunwind_descr);
+ 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)
+libunwind_frame_set_descr (struct gdbarch *gdbarch,
+ struct libunwind_descr *descr)
{
struct libunwind_descr *arch_descr;
{
/* First time here. Must initialize data area. */
arch_descr = libunwind_descr_init (gdbarch);
- deprecated_set_gdbarch_data (gdbarch, libunwind_descr_handle, arch_descr);
+ deprecated_set_gdbarch_data (gdbarch,
+ libunwind_descr_handle, arch_descr);
}
/* Copy new descriptor info into arch descriptor. */
}
static struct libunwind_frame_cache *
-libunwind_frame_cache (struct frame_info *next_frame, void **this_cache)
+libunwind_frame_cache (struct frame_info *this_frame, void **this_cache)
{
unw_accessors_t *acc;
unw_addr_space_t as;
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)
/* Allocate a new cache. */
cache = FRAME_OBSTACK_ZALLOC (struct libunwind_frame_cache);
- /* We can assume we are unwinding a normal frame. Even if this is
- for a signal trampoline, ia64 signal "trampolines" use a normal
- subroutine call to start the signal handler. */
- cache->func_addr = frame_func_unwind (next_frame, NORMAL_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
- 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 (get_frame_arch (next_frame));
+ 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,
- TARGET_BYTE_ORDER == BFD_ENDIAN_BIG
+ gdbarch_byte_order (gdbarch)
+ == BFD_ENDIAN_BIG
? __BIG_ENDIAN
: __LITTLE_ENDIAN);
- unw_init_remote_p (&cache->cursor, as, next_frame);
+ unw_init_remote_p (&cache->cursor, as, this_frame);
if (unw_step_p (&cache->cursor) < 0)
- return NULL;
+ {
+ unw_destroy_addr_space_p (as);
+ return NULL;
+ }
/* To get base address, get sp from previous frame. */
- uw_sp_regnum = descr->gdb2uw (SP_REGNUM);
+ uw_sp_regnum = descr->gdb2uw (gdbarch_sp_regnum (gdbarch));
ret = unw_get_reg_p (&cache->cursor, uw_sp_regnum, &fp);
if (ret < 0)
- error (_("Can't get libunwind sp register."));
+ {
+ 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)
{
static const struct frame_unwind libunwind_frame_unwind =
{
NORMAL_FRAME,
+ default_frame_unwind_stop_reason,
libunwind_frame_this_id,
- libunwind_frame_prev_register
+ 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. */
-const struct frame_unwind *
-libunwind_frame_sniffer (struct frame_info *next_frame)
+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. */
+ /* 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));
+ descr = libunwind_descr (gdbarch);
acc = descr->accessors;
as = unw_create_addr_space_p (acc,
- TARGET_BYTE_ORDER == BFD_ENDIAN_BIG
+ gdbarch_byte_order (gdbarch)
+ == BFD_ENDIAN_BIG
? __BIG_ENDIAN
: __LITTLE_ENDIAN);
- ret = unw_init_remote_p (&cursor, as, next_frame);
+ ret = unw_init_remote_p (&cursor, as, this_frame);
if (ret < 0)
- return NULL;
+ {
+ 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 NULL;
+ return 0;
- return &libunwind_frame_unwind;
+ return 1;
}
void
-libunwind_frame_this_id (struct frame_info *next_frame, void **this_cache,
- struct frame_id *this_id)
+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 (next_frame, this_cache);
+ libunwind_frame_cache (this_frame, this_cache);
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, gdb_byte *valuep)
+struct value *
+libunwind_frame_prev_register (struct frame_info *this_frame,
+ void **this_cache, int regnum)
{
struct libunwind_frame_cache *cache =
- libunwind_frame_cache (next_frame, this_cache);
+ libunwind_frame_cache (this_frame, this_cache);
+ struct gdbarch *gdbarch = get_frame_arch (this_frame);
void *ptr;
unw_cursor_t *c;
unw_fpreg_t fpval;
unw_regnum_t uw_regnum;
struct libunwind_descr *descr;
+ struct value *val = NULL;
if (cache == NULL)
- return;
+ return frame_unwind_got_constant (this_frame, regnum, 0);
/* Convert from gdb register number to libunwind register number. */
- descr = libunwind_descr (get_frame_arch (next_frame));
+ descr = libunwind_descr (get_frame_arch (this_frame));
uw_regnum = descr->gdb2uw (regnum);
gdb_assert (regnum >= 0);
if (!target_has_registers)
error (_("No registers."));
- *optimizedp = 0;
- *addrp = 0;
- *lvalp = not_lval;
- *realnump = -1;
-
- if (valuep)
- memset (valuep, 0, register_size (current_gdbarch, regnum));
-
if (uw_regnum < 0)
- return;
-
- /* To get the previous register, we use the libunwind register APIs with
- the cursor we have already pushed back to the previous frame. */
-
- if (descr->is_fpreg (uw_regnum))
- {
- ret = unw_get_fpreg_p (&cache->cursor, uw_regnum, &fpval);
- ptr = &fpval;
- }
- else
- {
- ret = unw_get_reg_p (&cache->cursor, uw_regnum, &intval);
- ptr = &intval;
- }
-
- if (ret < 0)
- return;
-
- if (valuep)
- memcpy (valuep, ptr, register_size (current_gdbarch, regnum));
+ return frame_unwind_got_constant (this_frame, regnum, 0);
if (unw_get_saveloc_p (&cache->cursor, uw_regnum, &sl) < 0)
- return;
+ return frame_unwind_got_constant (this_frame, regnum, 0);
switch (sl.type)
{
- case UNW_SLT_NONE:
- *optimizedp = 1;
- break;
-
case UNW_SLT_MEMORY:
- *lvalp = lval_memory;
- *addrp = sl.u.addr;
+ val = frame_unwind_got_memory (this_frame, regnum, sl.u.addr);
break;
case UNW_SLT_REG:
- *lvalp = lval_register;
- *realnump = regnum;
+ 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 *next_frame, void **this_cache)
+libunwind_frame_base_address (struct frame_info *this_frame, void **this_cache)
{
struct libunwind_frame_cache *cache =
- libunwind_frame_cache (next_frame, this_cache);
+ libunwind_frame_cache (this_frame, this_cache);
if (cache == NULL)
return (CORE_ADDR)NULL;
}
/* 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)
+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
has found sufficient libunwind unwinding information to do
so. */
- descr = libunwind_descr (get_frame_arch (next_frame));
+ descr = libunwind_descr (gdbarch);
acc = descr->accessors;
as = unw_create_addr_space_p (acc,
- TARGET_BYTE_ORDER == BFD_ENDIAN_BIG
+ gdbarch_byte_order (gdbarch)
+ == BFD_ENDIAN_BIG
? __BIG_ENDIAN
: __LITTLE_ENDIAN);
- ret = unw_init_remote_p (&cursor, as, next_frame);
+ ret = unw_init_remote_p (&cursor, as, this_frame);
if (ret < 0)
- return NULL;
+ {
+ 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 &libunwind_frame_unwind;
+ return 1;
- return NULL;
+ return 0;
}
/* The following routine is for accessing special registers of the top frame.
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)
+libunwind_get_reg_special (struct gdbarch *gdbarch, struct regcache *regcache,
+ int regnum, void *buf)
{
unw_cursor_t cursor;
unw_accessors_t *acc;
descr = libunwind_descr (gdbarch);
acc = descr->special_accessors;
as = unw_create_addr_space_p (acc,
- TARGET_BYTE_ORDER == BFD_ENDIAN_BIG
+ gdbarch_byte_order (gdbarch)
+ == BFD_ENDIAN_BIG
? __BIG_ENDIAN
: __LITTLE_ENDIAN);
- ret = unw_init_remote_p (&cursor, as, NULL);
+ ret = unw_init_remote_p (&cursor, as, regcache);
if (ret < 0)
- return -1;
+ {
+ unw_destroy_addr_space_p (as);
+ return -1;
+ }
uw_regnum = descr->gdb2uw (regnum);
ptr = &intval;
}
+ unw_destroy_addr_space_p (as);
+
if (ret < 0)
return -1;
if (buf)
- memcpy (buf, ptr, register_size (current_gdbarch, regnum));
+ memcpy (buf, ptr, register_size (gdbarch, regnum));
return 0;
}
handle = dlopen (LIBUNWIND_SO, RTLD_NOW);
if (handle == NULL)
- return 0;
+ {
+ fprintf_unfiltered (gdb_stderr, _("[GDB failed to load %s: %s]\n"),
+ LIBUNWIND_SO, dlerror ());
+ return 0;
+ }
/* Initialize pointers to the dynamic library functions we will use. */
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;
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 ();
}
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