/* libthread_db assisted debugging support, generic parts. Copyright 1999, 2000, 2001 Free Software Foundation, Inc. This file is part of GDB. 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 (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include "defs.h" #include "gdb_assert.h" #include <dlfcn.h> #include "gdb_proc_service.h" #include "gdb_thread_db.h" #include "bfd.h" #include "gdbthread.h" #include "inferior.h" #include "symfile.h" #include "objfiles.h" #include "target.h" #include "regcache.h" #ifndef LIBTHREAD_DB_SO #define LIBTHREAD_DB_SO "libthread_db.so.1" #endif /* If we're running on GNU/Linux, we must explicitly attach to any new threads. */ /* FIXME: There is certainly some room for improvements: - Cache LWP ids. - Bypass libthread_db when fetching or storing registers for threads bound to a LWP. */ /* This module's target vector. */ static struct target_ops thread_db_ops; /* The target vector that we call for things this module can't handle. */ 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); /* Non-zero if we're using this module's target vector. */ static int using_thread_db; /* Non-zero if we have to keep this module's target vector active across re-runs. */ static int keep_thread_db; /* Non-zero if we have determined the signals used by the threads library. */ static int thread_signals; static sigset_t thread_stop_set; static sigset_t thread_print_set; /* Structure that identifies the child process for the <proc_service.h> interface. */ static struct ps_prochandle proc_handle; /* Connection to the libthread_db library. */ static td_thragent_t *thread_agent; /* Pointers to the libthread_db functions. */ 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_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_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, 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); static td_err_e (*td_ta_set_event_p) (const td_thragent_t *ta, td_thr_events_t *event); static td_err_e (*td_ta_event_getmsg_p) (const td_thragent_t *ta, td_event_msg_t *msg); static td_err_e (*td_thr_validate_p) (const td_thrhandle_t *th); static td_err_e (*td_thr_get_info_p) (const td_thrhandle_t *th, td_thrinfo_t *infop); static td_err_e (*td_thr_getfpregs_p) (const td_thrhandle_t *th, gdb_prfpregset_t *regset); static td_err_e (*td_thr_getgregs_p) (const td_thrhandle_t *th, prgregset_t gregs); static td_err_e (*td_thr_setfpregs_p) (const td_thrhandle_t *th, 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); /* Location of the thread creation event breakpoint. The code at this location in the child process will be called by the pthread library whenever a new thread is created. By setting a special breakpoint at this location, GDB can detect when a new thread is created. We obtain this location via the td_ta_event_addr call. */ static CORE_ADDR td_create_bp_addr; /* Location of the thread death event breakpoint. */ static CORE_ADDR td_death_bp_addr; /* Prototypes for local functions. */ static void thread_db_find_new_threads (void); /* Building process ids. */ #define GET_PID(ptid) ptid_get_pid (ptid) #define GET_LWP(ptid) ptid_get_lwp (ptid) #define GET_THREAD(ptid) ptid_get_tid (ptid) #define is_lwp(ptid) (GET_LWP (ptid) != 0) #define is_thread(ptid) (GET_THREAD (ptid) != 0) #define BUILD_LWP(lwp, pid) ptid_build (pid, lwp, 0) #define BUILD_THREAD(tid, pid) ptid_build (pid, 0, tid) struct private_thread_info { /* Cached LWP id. Must come first, see lin-lwp.c. */ lwpid_t lwpid; }; static char * thread_db_err_str (td_err_e err) { static char buf[64]; switch (err) { case TD_OK: return "generic 'call succeeded'"; case TD_ERR: return "generic error"; case TD_NOTHR: return "no thread to satisfy query"; case TD_NOSV: return "no sync handle to satisfy query"; case TD_NOLWP: return "no LWP to satisfy query"; case TD_BADPH: return "invalid process handle"; case TD_BADTH: return "invalid thread handle"; case TD_BADSH: return "invalid synchronization handle"; case TD_BADTA: return "invalid thread agent"; case TD_BADKEY: return "invalid key"; case TD_NOMSG: return "no event message for getmsg"; case TD_NOFPREGS: return "FPU register set not available"; case TD_NOLIBTHREAD: return "application not linked with libthread"; case TD_NOEVENT: return "requested event is not supported"; case TD_NOCAPAB: return "capability not available"; case TD_DBERR: return "debugger service failed"; case TD_NOAPLIC: return "operation not applicable to"; case TD_NOTSD: return "no thread-specific data for this thread"; case TD_MALLOC: return "malloc failed"; case TD_PARTIALREG: return "only part of register set was written/read"; case TD_NOXREGS: return "X register set not available for this thread"; default: snprintf (buf, sizeof (buf), "unknown thread_db error '%d'", err); return buf; } } static char * thread_db_state_str (td_thr_state_e state) { static char buf[64]; switch (state) { case TD_THR_STOPPED: return "stopped by debugger"; case TD_THR_RUN: return "runnable"; case TD_THR_ACTIVE: return "active"; case TD_THR_ZOMBIE: return "zombie"; case TD_THR_SLEEP: return "sleeping"; case TD_THR_STOPPED_ASLEEP: return "stopped by debugger AND blocked"; default: snprintf (buf, sizeof (buf), "unknown thread_db state %d", state); return buf; } } /* Convert between user-level thread ids and LWP ids. */ static ptid_t thread_from_lwp (ptid_t ptid) { td_thrinfo_t ti; td_thrhandle_t th; td_err_e err; if (GET_LWP (ptid) == 0) ptid = BUILD_LWP (GET_PID (ptid), GET_PID (ptid)); gdb_assert (is_lwp (ptid)); err = td_ta_map_lwp2thr_p (thread_agent, GET_LWP (ptid), &th); if (err != TD_OK) error ("Cannot find user-level thread for LWP %d: %s", GET_LWP (ptid), thread_db_err_str (err)); err = td_thr_get_info_p (&th, &ti); if (err != TD_OK) error ("Cannot get thread info: %s", thread_db_err_str (err)); return BUILD_THREAD (ti.ti_tid, GET_PID (ptid)); } static ptid_t lwp_from_thread (ptid_t ptid) { td_thrinfo_t ti; td_thrhandle_t th; td_err_e err; if (!is_thread (ptid)) return ptid; err = td_ta_map_id2thr_p (thread_agent, GET_THREAD (ptid), &th); if (err != TD_OK) error ("Cannot find thread %ld: %s", (long) GET_THREAD (ptid), thread_db_err_str (err)); err = td_thr_get_info_p (&th, &ti); if (err != TD_OK) error ("Cannot get thread info: %s", thread_db_err_str (err)); return BUILD_LWP (ti.ti_lid, GET_PID (ptid)); } void thread_db_init (struct target_ops *target) { target_beneath = target; } static int thread_db_load (void) { void *handle; td_err_e err; handle = dlopen (LIBTHREAD_DB_SO, RTLD_NOW); if (handle == NULL) return 0; /* Initialize pointers to the dynamic library functions we will use. Essential functions first. */ td_init_p = dlsym (handle, "td_init"); if (td_init_p == NULL) return 0; td_ta_new_p = dlsym (handle, "td_ta_new"); if (td_ta_new_p == NULL) return 0; td_ta_map_id2thr_p = 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"); if (td_ta_map_lwp2thr_p == NULL) return 0; td_ta_thr_iter_p = dlsym (handle, "td_ta_thr_iter"); if (td_ta_thr_iter_p == NULL) return 0; td_thr_validate_p = dlsym (handle, "td_thr_validate"); if (td_thr_validate_p == NULL) return 0; td_thr_get_info_p = dlsym (handle, "td_thr_get_info"); if (td_thr_get_info_p == NULL) return 0; td_thr_getfpregs_p = dlsym (handle, "td_thr_getfpregs"); if (td_thr_getfpregs_p == NULL) return 0; td_thr_getgregs_p = dlsym (handle, "td_thr_getgregs"); if (td_thr_getgregs_p == NULL) return 0; td_thr_setfpregs_p = dlsym (handle, "td_thr_setfpregs"); if (td_thr_setfpregs_p == NULL) return 0; td_thr_setgregs_p = dlsym (handle, "td_thr_setgregs"); if (td_thr_setgregs_p == NULL) return 0; /* Initialize the library. */ err = td_init_p (); if (err != TD_OK) { warning ("Cannot initialize libthread_db: %s", thread_db_err_str (err)); return 0; } /* These are not essential. */ td_ta_event_addr_p = dlsym (handle, "td_ta_event_addr"); td_ta_set_event_p = dlsym (handle, "td_ta_set_event"); td_ta_event_getmsg_p = dlsym (handle, "td_ta_event_getmsg"); td_thr_event_enable_p = dlsym (handle, "td_thr_event_enable"); return 1; } static void enable_thread_event_reporting (void) { td_thr_events_t events; td_notify_t notify; td_err_e err; /* We cannot use the thread event reporting facility if these functions aren't available. */ if (td_ta_event_addr_p == NULL || td_ta_set_event_p == NULL || td_ta_event_getmsg_p == NULL || td_thr_event_enable_p == NULL) return; /* Set the process wide mask saying which events we're interested in. */ td_event_emptyset (&events); td_event_addset (&events, TD_CREATE); #if 0 /* FIXME: kettenis/2000-04-23: The event reporting facility is broken for TD_DEATH events in glibc 2.1.3, so don't enable it for now. */ td_event_addset (&events, TD_DEATH); #endif err = td_ta_set_event_p (thread_agent, &events); if (err != TD_OK) { warning ("Unable to set global thread event mask: %s", thread_db_err_str (err)); return; } /* Delete previous thread event breakpoints, if any. */ remove_thread_event_breakpoints (); /* Get address for thread creation breakpoint. */ err = td_ta_event_addr_p (thread_agent, TD_CREATE, ¬ify); if (err != TD_OK) { warning ("Unable to get location for thread creation breakpoint: %s", thread_db_err_str (err)); 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); 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 disable_thread_event_reporting (void) { td_thr_events_t events; /* Set the process wide mask saying we aren't interested in any events anymore. */ td_event_emptyset (&events); td_ta_set_event_p (thread_agent, &events); /* Delete thread event breakpoints, if any. */ remove_thread_event_breakpoints (); td_create_bp_addr = 0; td_death_bp_addr = 0; } static void check_thread_signals (void) { #ifdef GET_THREAD_SIGNALS if (!thread_signals) { sigset_t mask; int i; GET_THREAD_SIGNALS (&mask); sigemptyset (&thread_stop_set); sigemptyset (&thread_print_set); for (i = 1; i < NSIG; i++) { if (sigismember (&mask, i)) { if (signal_stop_update (target_signal_from_host (i), 0)) sigaddset (&thread_stop_set, i); if (signal_print_update (target_signal_from_host (i), 0)) sigaddset (&thread_print_set, i); thread_signals = 1; } } } #endif } static void disable_thread_signals (void) { #ifdef GET_THREAD_SIGNALS if (thread_signals) { int i; for (i = 1; i < NSIG; i++) { if (sigismember (&thread_stop_set, i)) signal_stop_update (target_signal_from_host (i), 1); if (sigismember (&thread_print_set, i)) signal_print_update (target_signal_from_host (i), 1); } thread_signals = 0; } #endif } static void thread_db_new_objfile (struct objfile *objfile) { td_err_e err; /* Don't attempt to use thread_db on targets which can not run (core files). */ if (objfile == NULL || !target_has_execution) { /* All symbols have been discarded. If the thread_db target is active, deactivate it now. */ if (using_thread_db) { gdb_assert (proc_handle.pid == 0); unpush_target (&thread_db_ops); using_thread_db = 0; } keep_thread_db = 0; goto quit; } if (using_thread_db) /* Nothing to do. The thread library was already detected and the target vector was already activated. */ goto quit; /* Initialize the structure that identifies the child process. Note that at this point there is no guarantee that we actually have a child process. */ proc_handle.pid = GET_PID (inferior_ptid); /* Now attempt to open a connection to the thread library. */ err = td_ta_new_p (&proc_handle, &thread_agent); switch (err) { case TD_NOLIBTHREAD: /* No thread library was detected. */ break; case TD_OK: /* The thread library was detected. Activate the thread_db target. */ push_target (&thread_db_ops); using_thread_db = 1; /* If the thread library was detected in the main symbol file itself, we assume that the program was statically linked against the thread library and well have to keep this module's target vector activated until forever... Well, at least until all symbols have been discarded anyway (see above). */ if (objfile == symfile_objfile) { gdb_assert (proc_handle.pid == 0); keep_thread_db = 1; } /* We can only poke around if there actually is a child process. If there is no child process alive, postpone the steps below until one has been created. */ if (proc_handle.pid != 0) { enable_thread_event_reporting (); thread_db_find_new_threads (); } break; default: warning ("Cannot initialize thread debugging library: %s", thread_db_err_str (err)); break; } quit: if (target_new_objfile_chain) target_new_objfile_chain (objfile); } static void attach_thread (ptid_t ptid, const td_thrhandle_t *th_p, const td_thrinfo_t *ti_p, int verbose) { struct thread_info *tp; td_err_e err; check_thread_signals (); if (verbose) printf_unfiltered ("[New %s]\n", target_pid_to_str (ptid)); /* Add the thread to GDB's thread list. */ tp = add_thread (ptid); tp->private = xmalloc (sizeof (struct private_thread_info)); tp->private->lwpid = ti_p->ti_lid; if (ti_p->ti_state == TD_THR_UNKNOWN || ti_p->ti_state == TD_THR_ZOMBIE) return; /* A zombie thread -- do not attach. */ /* Under GNU/Linux, we have to attach to each and every thread. */ #ifdef ATTACH_LWP ATTACH_LWP (BUILD_LWP (ti_p->ti_lid, GET_PID (ptid)), 0); #endif /* Enable thread event reporting for this thread. */ err = td_thr_event_enable_p (th_p, 1); if (err != TD_OK) error ("Cannot enable thread event reporting for %s: %s", target_pid_to_str (ptid), thread_db_err_str (err)); } static void thread_db_attach (char *args, int from_tty) { target_beneath->to_attach (args, from_tty); /* Destroy thread info; it's no longer valid. */ init_thread_list (); /* The child process is now the actual multi-threaded program. Snatch its process ID... */ proc_handle.pid = GET_PID (inferior_ptid); /* ...and perform the remaining initialization steps. */ enable_thread_event_reporting (); thread_db_find_new_threads(); } static void detach_thread (ptid_t ptid, int verbose) { if (verbose) printf_unfiltered ("[%s exited]\n", target_pid_to_str (ptid)); } static void thread_db_detach (char *args, int from_tty) { disable_thread_event_reporting (); /* There's no need to save & restore inferior_ptid here, since the inferior is supposed to be survive this function call. */ inferior_ptid = lwp_from_thread (inferior_ptid); /* Forget about the child's process ID. We shouldn't need it anymore. */ proc_handle.pid = 0; target_beneath->to_detach (args, from_tty); } static void thread_db_resume (ptid_t ptid, int step, enum target_signal signo) { struct cleanup *old_chain = save_inferior_ptid (); if (GET_PID (ptid) == -1) inferior_ptid = lwp_from_thread (inferior_ptid); else if (is_thread (ptid)) ptid = lwp_from_thread (ptid); target_beneath->to_resume (ptid, step, signo); do_cleanups (old_chain); } /* Check if PID is currently stopped at the location of a thread event breakpoint location. If it is, read the event message and act upon the event. */ static void check_event (ptid_t ptid) { td_event_msg_t msg; td_thrinfo_t ti; td_err_e err; CORE_ADDR stop_pc; /* 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 (err == TD_NOMSG) return; 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 ("Cannot get thread info: %s", thread_db_err_str (err)); 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? */ 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); return; case TD_DEATH: #if 0 /* FIXME: See TD_CREATE. */ 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."); detach_thread (ptid, 1); return; default: error ("Spurious thread event."); } } static ptid_t thread_db_wait (ptid_t ptid, struct target_waitstatus *ourstatus) { extern ptid_t trap_ptid; if (GET_PID (ptid) != -1 && is_thread (ptid)) ptid = lwp_from_thread (ptid); ptid = target_beneath->to_wait (ptid, ourstatus); if (proc_handle.pid == 0) /* The current child process isn't the actual multi-threaded program yet, so don't try to do any special thread-specific post-processing and bail out early. */ return ptid; if (ourstatus->kind == TARGET_WAITKIND_EXITED) return pid_to_ptid (-1); if (ourstatus->kind == TARGET_WAITKIND_STOPPED && ourstatus->value.sig == TARGET_SIGNAL_TRAP) /* Check for a thread event. */ check_event (ptid); if (!ptid_equal (trap_ptid, null_ptid)) trap_ptid = thread_from_lwp (trap_ptid); return thread_from_lwp (ptid); } static int thread_db_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, int write, struct mem_attrib *attrib, struct target_ops *target) { struct cleanup *old_chain = save_inferior_ptid (); int xfer; if (is_thread (inferior_ptid)) { /* FIXME: This seems to be necessary to make sure breakpoints are removed. */ if (!target_thread_alive (inferior_ptid)) inferior_ptid = pid_to_ptid (GET_PID (inferior_ptid)); else inferior_ptid = lwp_from_thread (inferior_ptid); } xfer = target_beneath->to_xfer_memory (memaddr, myaddr, len, write, attrib, target); do_cleanups (old_chain); return xfer; } static void thread_db_fetch_registers (int regno) { td_thrhandle_t th; prgregset_t gregset; gdb_prfpregset_t fpregset; td_err_e err; if (!is_thread (inferior_ptid)) { /* Pass the request to the target beneath us. */ target_beneath->to_fetch_registers (regno); return; } err = td_ta_map_id2thr_p (thread_agent, GET_THREAD (inferior_ptid), &th); if (err != TD_OK) error ("Cannot find thread %ld: %s", (long) GET_THREAD (inferior_ptid), thread_db_err_str (err)); err = td_thr_getgregs_p (&th, gregset); if (err != TD_OK) error ("Cannot fetch general-purpose registers for thread %ld: %s", (long) GET_THREAD (inferior_ptid), thread_db_err_str (err)); err = td_thr_getfpregs_p (&th, &fpregset); if (err != TD_OK) error ("Cannot get floating-point registers for thread %ld: %s", (long) GET_THREAD (inferior_ptid), thread_db_err_str (err)); /* Note that we must call supply_gregset after calling the thread_db routines because the thread_db routines call ps_lgetgregs and friends which clobber GDB's register cache. */ supply_gregset ((gdb_gregset_t *) gregset); supply_fpregset (&fpregset); } static void thread_db_store_registers (int regno) { td_thrhandle_t th; prgregset_t gregset; gdb_prfpregset_t fpregset; td_err_e err; if (!is_thread (inferior_ptid)) { /* Pass the request to the target beneath us. */ target_beneath->to_store_registers (regno); return; } err = td_ta_map_id2thr_p (thread_agent, GET_THREAD (inferior_ptid), &th); if (err != TD_OK) error ("Cannot find thread %ld: %s", (long) GET_THREAD (inferior_ptid), thread_db_err_str (err)); if (regno != -1) { char raw[MAX_REGISTER_RAW_SIZE]; read_register_gen (regno, raw); thread_db_fetch_registers (-1); supply_register (regno, raw); } fill_gregset ((gdb_gregset_t *) gregset, -1); fill_fpregset (&fpregset, -1); err = td_thr_setgregs_p (&th, gregset); if (err != TD_OK) error ("Cannot store general-purpose registers for thread %ld: %s", (long) GET_THREAD (inferior_ptid), thread_db_err_str (err)); err = td_thr_setfpregs_p (&th, &fpregset); if (err != TD_OK) error ("Cannot store floating-point registers for thread %ld: %s", (long) GET_THREAD (inferior_ptid), thread_db_err_str (err)); } static void thread_db_kill (void) { /* There's no need to save & restore inferior_ptid here, since the inferior isn't supposed to survive this function call. */ inferior_ptid = lwp_from_thread (inferior_ptid); target_beneath->to_kill (); } static void thread_db_create_inferior (char *exec_file, char *allargs, char **env) { if (!keep_thread_db) { unpush_target (&thread_db_ops); using_thread_db = 0; } target_beneath->to_create_inferior (exec_file, allargs, env); } static void thread_db_post_startup_inferior (ptid_t ptid) { if (proc_handle.pid == 0) { /* The child process is now the actual multi-threaded program. Snatch its process ID... */ proc_handle.pid = GET_PID (ptid); /* ...and perform the remaining initialization steps. */ enable_thread_event_reporting (); thread_db_find_new_threads (); } } static void thread_db_mourn_inferior (void) { remove_thread_event_breakpoints (); /* Forget about the child's process ID. We shouldn't need it anymore. */ proc_handle.pid = 0; target_beneath->to_mourn_inferior (); } static int thread_db_thread_alive (ptid_t ptid) { td_thrhandle_t th; td_thrinfo_t ti; td_err_e err; if (is_thread (ptid)) { err = td_ta_map_id2thr_p (thread_agent, GET_THREAD (ptid), &th); if (err != TD_OK) return 0; err = td_thr_validate_p (&th); if (err != TD_OK) return 0; err = td_thr_get_info_p (&th, &ti); if (err != TD_OK) return 0; if (ti.ti_state == TD_THR_UNKNOWN || ti.ti_state == TD_THR_ZOMBIE) return 0; /* A zombie thread. */ return 1; } if (target_beneath->to_thread_alive) return target_beneath->to_thread_alive (ptid); return 0; } static int find_new_threads_callback (const td_thrhandle_t *th_p, void *data) { td_thrinfo_t ti; td_err_e err; ptid_t ptid; err = td_thr_get_info_p (th_p, &ti); if (err != TD_OK) error ("Cannot get thread info: %s", thread_db_err_str (err)); if (ti.ti_state == TD_THR_UNKNOWN || ti.ti_state == TD_THR_ZOMBIE) return 0; /* A zombie -- ignore. */ ptid = BUILD_THREAD (ti.ti_tid, GET_PID (inferior_ptid)); if (!in_thread_list (ptid)) attach_thread (ptid, th_p, &ti, 1); return 0; } static void thread_db_find_new_threads (void) { td_err_e err; /* Iterate over all user-space threads to discover new threads. */ err = td_ta_thr_iter_p (thread_agent, find_new_threads_callback, NULL, TD_THR_ANY_STATE, TD_THR_LOWEST_PRIORITY, TD_SIGNO_MASK, TD_THR_ANY_USER_FLAGS); if (err != TD_OK) error ("Cannot find new threads: %s", thread_db_err_str (err)); } static char * thread_db_pid_to_str (ptid_t ptid) { if (is_thread (ptid)) { static char buf[64]; td_thrhandle_t th; td_thrinfo_t ti; td_err_e err; err = td_ta_map_id2thr_p (thread_agent, GET_THREAD (ptid), &th); if (err != TD_OK) error ("Cannot find thread %ld: %s", (long) GET_THREAD (ptid), thread_db_err_str (err)); err = td_thr_get_info_p (&th, &ti); if (err != TD_OK) error ("Cannot get thread info for thread %ld: %s", (long) GET_THREAD (ptid), thread_db_err_str (err)); if (ti.ti_state == TD_THR_ACTIVE && ti.ti_lid != 0) { snprintf (buf, sizeof (buf), "Thread %ld (LWP %d)", (long) ti.ti_tid, ti.ti_lid); } else { snprintf (buf, sizeof (buf), "Thread %ld (%s)", (long) ti.ti_tid, thread_db_state_str (ti.ti_state)); } return buf; } if (target_beneath->to_pid_to_str (ptid)) return target_beneath->to_pid_to_str (ptid); return normal_pid_to_str (ptid); } static void init_thread_db_ops (void) { thread_db_ops.to_shortname = "multi-thread"; thread_db_ops.to_longname = "multi-threaded child process."; thread_db_ops.to_doc = "Threads and pthreads support."; thread_db_ops.to_attach = thread_db_attach; thread_db_ops.to_detach = thread_db_detach; thread_db_ops.to_resume = thread_db_resume; thread_db_ops.to_wait = thread_db_wait; thread_db_ops.to_fetch_registers = thread_db_fetch_registers; thread_db_ops.to_store_registers = thread_db_store_registers; thread_db_ops.to_xfer_memory = thread_db_xfer_memory; thread_db_ops.to_kill = thread_db_kill; thread_db_ops.to_create_inferior = thread_db_create_inferior; thread_db_ops.to_post_startup_inferior = thread_db_post_startup_inferior; thread_db_ops.to_mourn_inferior = thread_db_mourn_inferior; thread_db_ops.to_thread_alive = thread_db_thread_alive; thread_db_ops.to_find_new_threads = thread_db_find_new_threads; thread_db_ops.to_pid_to_str = thread_db_pid_to_str; thread_db_ops.to_stratum = thread_stratum; thread_db_ops.to_has_thread_control = tc_schedlock; thread_db_ops.to_magic = OPS_MAGIC; } void _initialize_thread_db (void) { /* Only initialize the module if we can load libthread_db. */ if (thread_db_load ()) { init_thread_db_ops (); add_target (&thread_db_ops); /* Add ourselves to objfile event chain. */ target_new_objfile_chain = target_new_objfile_hook; target_new_objfile_hook = thread_db_new_objfile; } }