| /* libthread_db assisted debugging support, generic parts. |
| Copyright 1999, 2000 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 "gdbthread.h" |
| #include "inferior.h" |
| #include "target.h" |
| |
| #ifndef LIBTHREAD_DB_SO |
| #define LIBTHREAD_DB_SO "libthread_db.so.1" |
| #endif |
| |
| /* If we're running on 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 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 int find_new_threads_callback (const td_thrhandle_t *th_p, void *data); |
| |
| |
| /* Building process ids. */ |
| |
| #ifndef TIDGET |
| #define TIDGET(PID) (((PID) & 0x7fffffff) >> 16) |
| #define PIDGET(PID) (((PID) & 0xffff)) |
| #define MERGEPID(PID, TID) (((PID) & 0xffff) | ((TID) << 16)) |
| #endif |
| |
| #define THREAD_FLAG 0x80000000 |
| |
| #define is_lwp(pid) (((pid) & THREAD_FLAG) == 0 && TIDGET (pid)) |
| #define is_thread(pid) ((pid) & THREAD_FLAG) |
| |
| #define GET_PID(pid) PIDGET (pid) |
| #define GET_LWP(pid) TIDGET (pid) |
| #define GET_THREAD(pid) TIDGET (pid) |
| |
| #define BUILD_LWP(tid, pid) MERGEPID (pid, tid) |
| #define BUILD_THREAD(tid, pid) (MERGEPID (pid, tid) | THREAD_FLAG) |
| |
| |
| struct private_thread_info |
| { |
| /* Cached LWP id. Must come first, see lin-lwp.c. */ |
| lwpid_t lwpid; |
| }; |
| |
| |
| /* Helper functions. */ |
| |
| static void |
| restore_inferior_pid (void *arg) |
| { |
| int *saved_pid_ptr = arg; |
| inferior_pid = *saved_pid_ptr; |
| xfree (arg); |
| } |
| |
| static struct cleanup * |
| save_inferior_pid (void) |
| { |
| int *saved_pid_ptr; |
| |
| saved_pid_ptr = xmalloc (sizeof (int)); |
| *saved_pid_ptr = inferior_pid; |
| return make_cleanup (restore_inferior_pid, saved_pid_ptr); |
| } |
| |
| |
| 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 int |
| thread_from_lwp (int pid) |
| { |
| td_thrinfo_t ti; |
| td_thrhandle_t th; |
| td_err_e err; |
| |
| if (GET_LWP (pid) == 0) |
| pid = BUILD_LWP (pid, pid); |
| |
| gdb_assert (is_lwp (pid)); |
| |
| err = td_ta_map_lwp2thr_p (thread_agent, GET_LWP (pid), &th); |
| if (err != TD_OK) |
| error ("Cannot find user-level thread for LWP %d: %s", |
| GET_LWP (pid), 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 (pid)); |
| } |
| |
| static int |
| lwp_from_thread (int pid) |
| { |
| td_thrinfo_t ti; |
| td_thrhandle_t th; |
| td_err_e err; |
| |
| if (! is_thread (pid)) |
| return pid; |
| |
| err = td_ta_map_id2thr_p (thread_agent, GET_THREAD (pid), &th); |
| if (err != TD_OK) |
| error ("Cannot find thread %ld: %s", |
| (long) GET_THREAD (pid), 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 (pid)); |
| } |
| |
| |
| 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 creation 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 = 0; 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 = 0; 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_push_target (void) |
| { |
| using_thread_db = 1; |
| |
| /* Push this target vector. */ |
| push_target (&thread_db_ops); |
| |
| enable_thread_event_reporting (); |
| } |
| |
| static void |
| thread_db_unpush_target (void) |
| { |
| /* Unpush this target vector. */ |
| unpush_target (&thread_db_ops); |
| |
| using_thread_db = 0; |
| } |
| |
| static void |
| thread_db_new_objfile (struct objfile *objfile) |
| { |
| td_err_e err; |
| |
| if (using_thread_db) |
| /* Nothing to do. The thread library was already detected and the |
| target vector was already activated. */ |
| goto quit; |
| |
| if (objfile == NULL) |
| /* Un-interesting object file. */ |
| goto quit; |
| |
| /* Initialize the structure that identifies the child process. */ |
| proc_handle.pid = GET_PID (inferior_pid); |
| |
| /* Now attempt to open a connection to the thread library running in |
| the child process. */ |
| err = td_ta_new_p (&proc_handle, &thread_agent); |
| switch (err) |
| { |
| case TD_NOLIBTHREAD: |
| /* No thread library found in the child process, probably |
| because the child process isn't running yet. */ |
| break; |
| |
| case TD_OK: |
| /* The thread library was detected in the child; we go live now! */ |
| thread_db_push_target (); |
| |
| /* Find all user-space threads. */ |
| err = td_ta_thr_iter_p (thread_agent, find_new_threads_callback, |
| &inferior_pid, TD_THR_ANY_STATE, |
| TD_THR_LOWEST_PRIORITY, TD_SIGNO_MASK, |
| TD_THR_ANY_USER_FLAGS); |
| if (err != TD_OK) |
| error ("Finding new threads failed: %s", thread_db_err_str (err)); |
| 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 (int pid, 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 (pid)); |
| |
| /* Add the thread to GDB's thread list. */ |
| tp = add_thread (pid); |
| tp->private = xmalloc (sizeof (struct private_thread_info)); |
| tp->private->lwpid = ti_p->ti_lid; |
| |
| /* Under Linux, we have to attach to each and every thread. */ |
| #ifdef ATTACH_LWP |
| if (ti_p->ti_lid != GET_PID (pid)) |
| ATTACH_LWP (BUILD_LWP (ti_p->ti_lid, GET_PID (pid)), 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 (pid), thread_db_err_str (err)); |
| } |
| |
| static void |
| detach_thread (int pid, int verbose) |
| { |
| if (verbose) |
| printf_unfiltered ("[%s exited]\n", target_pid_to_str (pid)); |
| } |
| |
| static void |
| thread_db_detach (char *args, int from_tty) |
| { |
| disable_thread_event_reporting (); |
| thread_db_unpush_target (); |
| |
| target_beneath->to_detach (args, from_tty); |
| } |
| |
| static void |
| thread_db_resume (int pid, int step, enum target_signal signo) |
| { |
| struct cleanup *old_chain = save_inferior_pid (); |
| |
| if (pid == -1) |
| inferior_pid = lwp_from_thread (inferior_pid); |
| else if (is_thread (pid)) |
| pid = lwp_from_thread (pid); |
| |
| target_beneath->to_resume (pid, 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 (int pid) |
| { |
| 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 (pid) - 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)); |
| |
| pid = BUILD_THREAD (ti.ti_tid, GET_PID (pid)); |
| |
| 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 |
| |
| if (in_thread_list (pid)) |
| error ("Spurious thread creation event."); |
| |
| attach_thread (pid, 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 (pid)) |
| error ("Spurious thread death event."); |
| |
| detach_thread (pid, 1); |
| return; |
| |
| default: |
| error ("Spurious thread event."); |
| } |
| } |
| |
| static int |
| thread_db_wait (int pid, struct target_waitstatus *ourstatus) |
| { |
| extern int trap_pid; |
| |
| if (pid != -1 && is_thread (pid)) |
| pid = lwp_from_thread (pid); |
| |
| pid = target_beneath->to_wait (pid, ourstatus); |
| |
| if (ourstatus->kind == TARGET_WAITKIND_EXITED) |
| return -1; |
| |
| if (ourstatus->kind == TARGET_WAITKIND_STOPPED |
| && ourstatus->value.sig == TARGET_SIGNAL_TRAP) |
| /* Check for a thread event. */ |
| check_event (pid); |
| |
| if (trap_pid) |
| trap_pid = thread_from_lwp (trap_pid); |
| |
| return thread_from_lwp (pid); |
| } |
| |
| static int |
| thread_db_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, int write, |
| struct target_ops *target) |
| { |
| struct cleanup *old_chain = save_inferior_pid (); |
| int xfer; |
| |
| if (is_thread (inferior_pid)) |
| { |
| /* FIXME: This seems to be necessary to make sure breakpoints |
| are removed. */ |
| if (! target_thread_alive (inferior_pid)) |
| inferior_pid = GET_PID (inferior_pid); |
| else |
| inferior_pid = lwp_from_thread (inferior_pid); |
| } |
| |
| xfer = target_beneath->to_xfer_memory (memaddr, myaddr, len, write, 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_pid)) |
| { |
| /* 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_pid), &th); |
| if (err != TD_OK) |
| error ("Cannot find thread %ld: %s", |
| (long) GET_THREAD (inferior_pid), 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_pid), 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_pid), 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_pid)) |
| { |
| /* 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_pid), &th); |
| if (err != TD_OK) |
| error ("Cannot find thread %ld: %s", |
| (long) GET_THREAD (inferior_pid), 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_pid), 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_pid), thread_db_err_str (err)); |
| } |
| |
| static void |
| thread_db_kill (void) |
| { |
| target_beneath->to_kill (); |
| } |
| |
| static void |
| thread_db_create_inferior (char *exec_file, char *allargs, char **env) |
| { |
| /* We never want to actually create the inferior! If this is ever |
| called, it means we were on the target stack when the user said |
| "run". But we don't want to be on the new inferior's target |
| stack until the libthread_db connection is ready to be made. So |
| we unpush ourselves from the stack, and then invoke |
| find_default_create_inferior, which will invoke the appropriate |
| process_stratum target to do the create. */ |
| |
| thread_db_unpush_target (); |
| |
| find_default_create_inferior (exec_file, allargs, env); |
| } |
| |
| static void |
| thread_db_mourn_inferior (void) |
| { |
| remove_thread_event_breakpoints (); |
| thread_db_unpush_target (); |
| |
| target_beneath->to_mourn_inferior (); |
| } |
| |
| static int |
| thread_db_thread_alive (int pid) |
| { |
| if (is_thread (pid)) |
| { |
| td_thrhandle_t th; |
| td_err_e err; |
| |
| err = td_ta_map_id2thr_p (thread_agent, GET_THREAD (pid), &th); |
| if (err != TD_OK) |
| return 0; |
| |
| err = td_thr_validate_p (&th); |
| if (err != TD_OK) |
| return 0; |
| |
| return 1; |
| } |
| |
| if (target_beneath->to_thread_alive) |
| return target_beneath->to_thread_alive (pid); |
| |
| return 0; |
| } |
| |
| static int |
| find_new_threads_callback (const td_thrhandle_t *th_p, void *data) |
| { |
| td_thrinfo_t ti; |
| td_err_e err; |
| int pid; |
| |
| err = td_thr_get_info_p (th_p, &ti); |
| if (err != TD_OK) |
| error ("Cannot get thread info: %s", thread_db_err_str (err)); |
| |
| pid = BUILD_THREAD (ti.ti_tid, GET_PID (inferior_pid)); |
| |
| if (! in_thread_list (pid)) |
| attach_thread (pid, 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 (int pid) |
| { |
| if (is_thread (pid)) |
| { |
| 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 (pid), &th); |
| if (err != TD_OK) |
| error ("Cannot find thread %ld: %s", |
| (long) GET_THREAD (pid), 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 (pid), 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 (pid)) |
| return target_beneath->to_pid_to_str (pid); |
| |
| return normal_pid_to_str (pid); |
| } |
| |
| 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_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_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; |
| } |
| } |