#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"
static int libunwind_initialized;
static struct gdbarch_data *libunwind_descr_handle;
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 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;
};
#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));
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)
{
arch_descr = libunwind_descr_init (gdbarch);
deprecated_set_gdbarch_data (gdbarch, libunwind_descr_handle, arch_descr);
}
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 *next_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;
int i, ret;
if (*this_cache)
return *this_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;
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);
unw_init_remote_p (&cache->cursor, as, next_frame);
if (unw_step_p (&cache->cursor) < 0)
return NULL;
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."));
cache->base = (CORE_ADDR)fp;
*this_cache = cache;
return cache;
}
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,
libunwind_frame_this_id,
libunwind_frame_prev_register
};
const struct frame_unwind *
libunwind_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;
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;
ret = unw_is_signal_frame_p (&cursor);
if (ret < 0)
return NULL;
return &libunwind_frame_unwind;
}
void
libunwind_frame_this_id (struct frame_info *next_frame, void **this_cache,
struct frame_id *this_id)
{
struct libunwind_frame_cache *cache =
libunwind_frame_cache (next_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, void *valuep)
{
struct libunwind_frame_cache *cache =
libunwind_frame_cache (next_frame, this_cache);
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;
if (cache == NULL)
return;
descr = libunwind_descr (get_frame_arch (next_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;
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));
if (unw_get_saveloc_p (&cache->cursor, uw_regnum, &sl) < 0)
return;
switch (sl.type)
{
case UNW_SLT_NONE:
*optimizedp = 1;
break;
case UNW_SLT_MEMORY:
*lvalp = lval_memory;
*addrp = sl.u.addr;
break;
case UNW_SLT_REG:
*lvalp = lval_register;
*realnump = regnum;
break;
}
}
CORE_ADDR
libunwind_frame_base_address (struct frame_info *next_frame, void **this_cache)
{
struct libunwind_frame_cache *cache =
libunwind_frame_cache (next_frame, this_cache);
if (cache == NULL)
return (CORE_ADDR)NULL;
return cache->base;
}
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);
}
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;
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;
ret = unw_is_signal_frame_p (&cursor);
if (ret > 0)
return &libunwind_frame_unwind;
return NULL;
}
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)
{
void *handle;
handle = dlopen (LIBUNWIND_SO, RTLD_NOW);
if (handle == NULL)
return 0;
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_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;
}
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 ();
}