/* libthread_db assisted debugging support, generic parts.
- Copyright 1999, 2000, 2001 Free Software Foundation, Inc.
+
+ Copyright 1999, 2000, 2001, 2003 Free Software Foundation, Inc.
This file is part of GDB.
static struct target_ops *target_beneath;
/* Pointer to the next function on the objfile event chain. */
-static void (*target_new_objfile_chain) (struct objfile *objfile);
+static void (*target_new_objfile_chain) (struct objfile * objfile);
/* Non-zero if we're using this module's target vector. */
static int using_thread_db;
static td_err_e (*td_init_p) (void);
-static td_err_e (*td_ta_new_p) (struct ps_prochandle *ps, td_thragent_t **ta);
+static td_err_e (*td_ta_new_p) (struct ps_prochandle * ps,
+ td_thragent_t **ta);
static td_err_e (*td_ta_map_id2thr_p) (const td_thragent_t *ta, thread_t pt,
td_thrhandle_t *__th);
-static td_err_e (*td_ta_map_lwp2thr_p) (const td_thragent_t *ta, lwpid_t lwpid,
- td_thrhandle_t *th);
+static td_err_e (*td_ta_map_lwp2thr_p) (const td_thragent_t *ta,
+ lwpid_t lwpid, td_thrhandle_t *th);
static td_err_e (*td_ta_thr_iter_p) (const td_thragent_t *ta,
- td_thr_iter_f *callback,
- void *cbdata_p, td_thr_state_e state,
- int ti_pri, sigset_t *ti_sigmask_p,
+ td_thr_iter_f *callback, void *cbdata_p,
+ td_thr_state_e state, int ti_pri,
+ sigset_t *ti_sigmask_p,
unsigned int ti_user_flags);
static td_err_e (*td_ta_event_addr_p) (const td_thragent_t *ta,
td_event_e event, td_notify_t *ptr);
const gdb_prfpregset_t *fpregs);
static td_err_e (*td_thr_setgregs_p) (const td_thrhandle_t *th,
prgregset_t gregs);
-static td_err_e (*td_thr_event_enable_p) (const td_thrhandle_t *th, int event);
+static td_err_e (*td_thr_event_enable_p) (const td_thrhandle_t *th,
+ int event);
static td_err_e (*td_thr_tls_get_addr_p) (const td_thrhandle_t *th,
- void *map_address,
- size_t offset,
- void **address);
+ void *map_address,
+ size_t offset, void **address);
/* Location of the thread creation event breakpoint. The code at this
location in the child process will be called by the pthread library
struct private_thread_info
{
/* Cached thread state. */
- unsigned int th_valid : 1;
- unsigned int ti_valid : 1;
+ unsigned int th_valid:1;
+ unsigned int ti_valid:1;
td_thrhandle_t th;
td_thrinfo_t ti;
}
\f
/* A callback function for td_ta_thr_iter, which we use to map all
- threads to LWPs.
+ threads to LWPs.
THP is a handle to the current thread; if INFOP is not NULL, the
struct thread_info associated with this thread is returned in
err = td_thr_get_info_p (thp, &ti);
if (err != TD_OK)
- error ("thread_get_info_callback: cannot get thread info: %s",
+ error ("thread_get_info_callback: cannot get thread info: %s",
thread_db_err_str (err));
/* Fill the cache. */
{
if (fatal)
error ("Cannot find thread %ld: %s",
- (long) GET_THREAD (thread_info->ptid), thread_db_err_str (err));
+ (long) GET_THREAD (thread_info->ptid),
+ thread_db_err_str (err));
}
else
thread_info->private->th_valid = 1;
if (thread_info->private->ti_valid)
return &thread_info->private->ti;
- if (! thread_info->private->th_valid)
+ if (!thread_info->private->th_valid)
thread_db_map_id2thr (thread_info, 1);
- err = td_thr_get_info_p (&thread_info->private->th, &thread_info->private->ti);
+ err =
+ td_thr_get_info_p (&thread_info->private->th, &thread_info->private->ti);
if (err != TD_OK)
- error ("thread_db_get_info: cannot get thread info: %s",
+ error ("thread_db_get_info: cannot get thread info: %s",
thread_db_err_str (err));
thread_info->private->ti_valid = 1;
target_beneath = target;
}
+static void *
+verbose_dlsym (void *handle, const char *name)
+{
+ void *sym = dlsym (handle, name);
+ if (sym == NULL)
+ warning ("Symbol \"%s\" not found in libthread_db: %s", name, dlerror ());
+ return sym;
+}
+
static int
thread_db_load (void)
{
handle = dlopen (LIBTHREAD_DB_SO, RTLD_NOW);
if (handle == NULL)
{
- fprintf_filtered (gdb_stderr, "\n\ndlopen failed on '%s' - %s\n",
+ fprintf_filtered (gdb_stderr, "\n\ndlopen failed on '%s' - %s\n",
LIBTHREAD_DB_SO, dlerror ());
- fprintf_filtered (gdb_stderr,
+ fprintf_filtered (gdb_stderr,
"GDB will not be able to debug pthreads.\n\n");
return 0;
}
/* Initialize pointers to the dynamic library functions we will use.
Essential functions first. */
- td_init_p = dlsym (handle, "td_init");
+ td_init_p = verbose_dlsym (handle, "td_init");
if (td_init_p == NULL)
return 0;
- td_ta_new_p = dlsym (handle, "td_ta_new");
+ td_ta_new_p = verbose_dlsym (handle, "td_ta_new");
if (td_ta_new_p == NULL)
return 0;
- td_ta_map_id2thr_p = dlsym (handle, "td_ta_map_id2thr");
+ td_ta_map_id2thr_p = verbose_dlsym (handle, "td_ta_map_id2thr");
if (td_ta_map_id2thr_p == NULL)
return 0;
- td_ta_map_lwp2thr_p = dlsym (handle, "td_ta_map_lwp2thr");
+ td_ta_map_lwp2thr_p = verbose_dlsym (handle, "td_ta_map_lwp2thr");
if (td_ta_map_lwp2thr_p == NULL)
return 0;
- td_ta_thr_iter_p = dlsym (handle, "td_ta_thr_iter");
+ td_ta_thr_iter_p = verbose_dlsym (handle, "td_ta_thr_iter");
if (td_ta_thr_iter_p == NULL)
return 0;
- td_thr_validate_p = dlsym (handle, "td_thr_validate");
+ td_thr_validate_p = verbose_dlsym (handle, "td_thr_validate");
if (td_thr_validate_p == NULL)
return 0;
- td_thr_get_info_p = dlsym (handle, "td_thr_get_info");
+ td_thr_get_info_p = verbose_dlsym (handle, "td_thr_get_info");
if (td_thr_get_info_p == NULL)
return 0;
- td_thr_getfpregs_p = dlsym (handle, "td_thr_getfpregs");
+ td_thr_getfpregs_p = verbose_dlsym (handle, "td_thr_getfpregs");
if (td_thr_getfpregs_p == NULL)
return 0;
- td_thr_getgregs_p = dlsym (handle, "td_thr_getgregs");
+ td_thr_getgregs_p = verbose_dlsym (handle, "td_thr_getgregs");
if (td_thr_getgregs_p == NULL)
return 0;
- td_thr_setfpregs_p = dlsym (handle, "td_thr_setfpregs");
+ td_thr_setfpregs_p = verbose_dlsym (handle, "td_thr_setfpregs");
if (td_thr_setfpregs_p == NULL)
return 0;
- td_thr_setgregs_p = dlsym (handle, "td_thr_setgregs");
+ td_thr_setgregs_p = verbose_dlsym (handle, "td_thr_setgregs");
if (td_thr_setgregs_p == NULL)
return 0;
return 1;
}
+static td_err_e
+enable_thread_event (td_thragent_t *thread_agent, int event, CORE_ADDR *bp)
+{
+ td_notify_t notify;
+ td_err_e err;
+
+ /* Get the breakpoint address for thread EVENT. */
+ err = td_ta_event_addr_p (thread_agent, event, ¬ify);
+ if (err != TD_OK)
+ return err;
+
+ /* Set up the breakpoint. */
+ (*bp) = gdbarch_convert_from_func_ptr_addr (current_gdbarch,
+ (CORE_ADDR) notify.u.bptaddr,
+ ¤t_target);
+ create_thread_event_breakpoint ((*bp));
+
+ return TD_OK;
+}
+
static void
enable_thread_event_reporting (void)
{
/* Delete previous thread event breakpoints, if any. */
remove_thread_event_breakpoints ();
+ td_create_bp_addr = 0;
+ td_death_bp_addr = 0;
- /* Get address for thread creation breakpoint. */
- err = td_ta_event_addr_p (thread_agent, TD_CREATE, ¬ify);
+ /* Set up the thread creation event. */
+ err = enable_thread_event (thread_agent, TD_CREATE, &td_create_bp_addr);
if (err != TD_OK)
{
warning ("Unable to get location for thread creation breakpoint: %s",
return;
}
- /* Set up the breakpoint. */
- td_create_bp_addr = (CORE_ADDR) notify.u.bptaddr;
- create_thread_event_breakpoint (td_create_bp_addr);
-
- /* Get address for thread death breakpoint. */
- err = td_ta_event_addr_p (thread_agent, TD_DEATH, ¬ify);
+ /* Set up the thread death event. */
+ err = enable_thread_event (thread_agent, TD_DEATH, &td_death_bp_addr);
if (err != TD_OK)
{
warning ("Unable to get location for thread death breakpoint: %s",
thread_db_err_str (err));
return;
}
-
- /* Set up the breakpoint. */
- td_death_bp_addr = (CORE_ADDR) notify.u.bptaddr;
- create_thread_event_breakpoint (td_death_bp_addr);
}
static void
{
td_err_e err;
+ /* First time through, report that libthread_db was successfuly
+ loaded. Can't print this in in thread_db_load as, at that stage,
+ the interpreter and it's console haven't started. The real
+ problem here is that libthread_db is loaded too early - it should
+ only be loaded when there is a program to debug. */
+ {
+ static int dejavu;
+ if (!dejavu)
+ {
+ Dl_info info;
+ const char *library = NULL;
+ /* Try dladdr. */
+ if (dladdr ((*td_ta_new_p), &info) != 0)
+ library = info.dli_fname;
+ /* Try dlinfo? */
+ if (library == NULL)
+ /* Paranoid - don't let a NULL path slip through. */
+ library = LIBTHREAD_DB_SO;
+ printf_unfiltered ("Using host libthread_db library \"%s\".\n",
+ library);
+ dejavu = 1;
+ }
+ }
+
/* Don't attempt to use thread_db on targets which can not run
(core files). */
if (objfile == NULL || !target_has_execution)
break;
case TD_OK:
+ printf_unfiltered ("[Thread debugging using libthread_db enabled]\n");
+
/* The thread library was detected. Activate the thread_db target. */
push_target (&thread_db_ops);
using_thread_db = 1;
break;
}
- quit:
+quit:
if (target_new_objfile_chain)
target_new_objfile_chain (objfile);
}
/* ...and perform the remaining initialization steps. */
enable_thread_event_reporting ();
- thread_db_find_new_threads();
+ thread_db_find_new_threads ();
}
static void
td_thrinfo_t ti;
td_err_e err;
CORE_ADDR stop_pc;
+ int loop = 0;
/* Bail out early if we're not at a thread event breakpoint. */
stop_pc = read_pc_pid (ptid) - DECR_PC_AFTER_BREAK;
if (stop_pc != td_create_bp_addr && stop_pc != td_death_bp_addr)
return;
- err = td_ta_event_getmsg_p (thread_agent, &msg);
- if (err != TD_OK)
+ /* If we are at a create breakpoint, we do not know what new lwp
+ was created and cannot specifically locate the event message for it.
+ We have to call td_ta_event_getmsg() to get
+ the latest message. Since we have no way of correlating whether
+ the event message we get back corresponds to our breakpoint, we must
+ loop and read all event messages, processing them appropriately.
+ This guarantees we will process the correct message before continuing
+ from the breakpoint.
+
+ Currently, death events are not enabled. If they are enabled,
+ the death event can use the td_thr_event_getmsg() interface to
+ get the message specifically for that lwp and avoid looping
+ below. */
+
+ loop = 1;
+
+ do
{
- if (err == TD_NOMSG)
- return;
+ err = td_ta_event_getmsg_p (thread_agent, &msg);
+ if (err != TD_OK)
+ {
+ if (err == TD_NOMSG)
+ return;
- error ("Cannot get thread event message: %s", thread_db_err_str (err));
- }
+ error ("Cannot get thread event message: %s",
+ thread_db_err_str (err));
+ }
- err = td_thr_get_info_p (msg.th_p, &ti);
- if (err != TD_OK)
- error ("check_event: cannot get thread info: %s",
- thread_db_err_str (err));
+ err = td_thr_get_info_p (msg.th_p, &ti);
+ if (err != TD_OK)
+ error ("Cannot get thread info: %s", thread_db_err_str (err));
- ptid = BUILD_THREAD (ti.ti_tid, GET_PID (ptid));
+ ptid = BUILD_THREAD (ti.ti_tid, GET_PID (ptid));
- switch (msg.event)
- {
- case TD_CREATE:
-#if 0
- /* FIXME: kettenis/2000-08-26: Since we use td_ta_event_getmsg,
- there is no guarantee that the breakpoint will match the
- event. Should we use td_thr_event_getmsg instead? */
+ switch (msg.event)
+ {
+ case TD_CREATE:
- if (stop_pc != td_create_bp_addr)
- error ("Thread creation event doesn't match breakpoint.");
-#endif
+ /* We may already know about this thread, for instance when the
+ user has issued the `info threads' command before the SIGTRAP
+ for hitting the thread creation breakpoint was reported. */
+ if (!in_thread_list (ptid))
+ attach_thread (ptid, msg.th_p, &ti, 1);
- /* We may already know about this thread, for instance when the
- user has issued the `info threads' command before the SIGTRAP
- for hitting the thread creation breakpoint was reported. */
- if (!in_thread_list (ptid))
- attach_thread (ptid, msg.th_p, &ti, 1);
- return;
+ break;
- case TD_DEATH:
-#if 0
- /* FIXME: See TD_CREATE. */
+ case TD_DEATH:
- if (stop_pc != td_death_bp_addr)
- error ("Thread death event doesn't match breakpoint.");
-#endif
+ if (!in_thread_list (ptid))
+ error ("Spurious thread death event.");
- if (!in_thread_list (ptid))
- error ("Spurious thread death event.");
+ detach_thread (ptid, 1);
- detach_thread (ptid, 1);
- return;
+ break;
- default:
- error ("Spurious thread event.");
+ default:
+ error ("Spurious thread event.");
+ }
}
+ while (loop);
}
static ptid_t
static int
thread_db_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, int write,
- struct mem_attrib *attrib,
- struct target_ops *target)
+ struct mem_attrib *attrib, struct target_ops *target)
{
struct cleanup *old_chain = save_inferior_ptid ();
int xfer;
inferior_ptid = lwp_from_thread (inferior_ptid);
}
- xfer = target_beneath->to_xfer_memory (memaddr, myaddr, len, write, attrib, target);
+ xfer =
+ target_beneath->to_xfer_memory (memaddr, myaddr, len, write, attrib,
+ target);
do_cleanups (old_chain);
return xfer;
if (regno != -1)
{
- char raw[MAX_REGISTER_RAW_SIZE];
+ char raw[MAX_REGISTER_SIZE];
deprecated_read_register_gen (regno, raw);
thread_db_fetch_registers (-1);
proc_handle.pid = 0;
target_beneath->to_mourn_inferior ();
+
+ /* Detach thread_db target ops if not dealing with a statically
+ linked threaded program. This allows a corefile to be debugged
+ after finishing debugging of a threaded program. At present,
+ debugging a statically-linked threaded program is broken, but
+ the check is added below in the event that it is fixed in the
+ future. */
+ if (!keep_thread_db)
+ {
+ unpush_target (&thread_db_ops);
+ using_thread_db = 0;
+ }
}
static int
thread_info = find_thread_pid (ptid);
thread_db_map_id2thr (thread_info, 0);
- if (! thread_info->private->th_valid)
+ if (!thread_info->private->th_valid)
return 0;
err = td_thr_validate_p (&thread_info->private->th);
if (err != TD_OK)
return 0;
- if (! thread_info->private->ti_valid)
+ if (!thread_info->private->ti_valid)
{
- err = td_thr_get_info_p (&thread_info->private->th, &thread_info->private->ti);
+ err =
+ td_thr_get_info_p (&thread_info->private->th,
+ &thread_info->private->ti);
if (err != TD_OK)
return 0;
thread_info->private->ti_valid = 1;
err = td_thr_get_info_p (th_p, &ti);
if (err != TD_OK)
- error ("find_new_threads_callback: cannot get thread info: %s",
+ error ("find_new_threads_callback: cannot get thread info: %s",
thread_db_err_str (err));
if (ti.ti_state == TD_THR_UNKNOWN || ti.ti_state == TD_THR_ZOMBIE)
thread_info = find_thread_pid (ptid);
thread_db_map_id2thr (thread_info, 0);
- if (! thread_info->private->th_valid)
+ if (!thread_info->private->th_valid)
{
- snprintf (buf, sizeof (buf), "Thread %ld (Missing)", GET_THREAD (ptid));
+ snprintf (buf, sizeof (buf), "Thread %ld (Missing)",
+ GET_THREAD (ptid));
return buf;
}
else
{
snprintf (buf, sizeof (buf), "Thread %ld (%s)",
- (long) ti_p->ti_tid, thread_db_state_str (ti_p->ti_state));
+ (long) ti_p->ti_tid,
+ thread_db_state_str (ti_p->ti_state));
}
return buf;
static CORE_ADDR
thread_db_get_thread_local_address (ptid_t ptid, struct objfile *objfile,
- CORE_ADDR offset)
+ CORE_ADDR offset)
{
if (is_thread (ptid))
{
struct thread_info *thread_info;
/* glibc doesn't provide the needed interface. */
- if (! td_thr_tls_get_addr_p)
- error ("Cannot find thread-local variables in this thread library.");
+ if (!td_thr_tls_get_addr_p)
+ error ("Cannot find thread-local variables in this thread library.");
/* Get the address of the link map for this objfile. */
lm = svr4_fetch_objfile_link_map (objfile);
/* Whoops, we couldn't find one. Bail out. */
if (!lm)
- {
- if (objfile_is_library)
- error ("Cannot find shared library `%s' link_map in dynamic"
+ {
+ if (objfile_is_library)
+ error ("Cannot find shared library `%s' link_map in dynamic"
" linker's module list", objfile->name);
else
- error ("Cannot find executable file `%s' link_map in dynamic"
+ error ("Cannot find executable file `%s' link_map in dynamic"
" linker's module list", objfile->name);
}
#ifdef THREAD_DB_HAS_TD_NOTALLOC
/* The memory hasn't been allocated, yet. */
if (err == TD_NOTALLOC)
- {
- /* Now, if libthread_db provided the initialization image's
- address, we *could* try to build a non-lvalue value from
- the initialization image. */
- if (objfile_is_library)
- error ("The inferior has not yet allocated storage for"
- " thread-local variables in\n"
- "the shared library `%s'\n"
- "for the thread %ld",
+ {
+ /* Now, if libthread_db provided the initialization image's
+ address, we *could* try to build a non-lvalue value from
+ the initialization image. */
+ if (objfile_is_library)
+ error ("The inferior has not yet allocated storage for"
+ " thread-local variables in\n"
+ "the shared library `%s'\n"
+ "for the thread %ld",
objfile->name, (long) GET_THREAD (ptid));
- else
- error ("The inferior has not yet allocated storage for"
- " thread-local variables in\n"
- "the executable `%s'\n"
- "for the thread %ld",
+ else
+ error ("The inferior has not yet allocated storage for"
+ " thread-local variables in\n"
+ "the executable `%s'\n"
+ "for the thread %ld",
objfile->name, (long) GET_THREAD (ptid));
}
#endif
error ("Cannot find thread-local storage for thread %ld, "
"shared library %s:\n%s",
(long) GET_THREAD (ptid),
- objfile->name,
- thread_db_err_str (err));
+ objfile->name, thread_db_err_str (err));
else
error ("Cannot find thread-local storage for thread %ld, "
"executable file %s:\n%s",
(long) GET_THREAD (ptid),
- objfile->name,
- thread_db_err_str (err));
+ objfile->name, thread_db_err_str (err));
}
/* Cast assuming host == target. Joy. */
}
if (target_beneath->to_get_thread_local_address)
- return target_beneath->to_get_thread_local_address (ptid, objfile, offset);
+ return target_beneath->to_get_thread_local_address (ptid, objfile,
+ offset);
error ("Cannot find thread-local values on this target.");
}