| /* Thread management interface, for the remote server for GDB. |
| Copyright (C) 2002, 2004, 2005, 2006, 2007, 2008, 2009, 2010 |
| Free Software Foundation, Inc. |
| |
| Contributed by MontaVista Software. |
| |
| 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 3 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, see <http://www.gnu.org/licenses/>. */ |
| |
| #include "server.h" |
| |
| #include "linux-low.h" |
| |
| extern int debug_threads; |
| |
| static int thread_db_use_events; |
| |
| #include "gdb_proc_service.h" |
| #include "../gdb_thread_db.h" |
| |
| #ifndef USE_LIBTHREAD_DB_DIRECTLY |
| #include <dlfcn.h> |
| #endif |
| |
| #include <stdint.h> |
| #include <limits.h> |
| #include <ctype.h> |
| |
| struct thread_db |
| { |
| /* Structure that identifies the child process for the |
| <proc_service.h> interface. */ |
| struct ps_prochandle proc_handle; |
| |
| /* Connection to the libthread_db library. */ |
| td_thragent_t *thread_agent; |
| |
| /* If this flag has been set, we've already asked GDB for all |
| symbols we might need; assume symbol cache misses are |
| failures. */ |
| int all_symbols_looked_up; |
| |
| #ifndef USE_LIBTHREAD_DB_DIRECTLY |
| /* Handle of the libthread_db from dlopen. */ |
| void *handle; |
| #endif |
| |
| /* 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. Note that if the |
| running kernel supports tracing clones, then we don't need to use |
| (and in fact don't use) this magic thread event breakpoint to |
| learn about threads. */ |
| struct breakpoint *td_create_bp; |
| |
| /* Addresses of libthread_db functions. */ |
| td_err_e (*td_ta_new_p) (struct ps_prochandle * ps, td_thragent_t **ta); |
| td_err_e (*td_ta_event_getmsg_p) (const td_thragent_t *ta, |
| td_event_msg_t *msg); |
| td_err_e (*td_ta_set_event_p) (const td_thragent_t *ta, |
| td_thr_events_t *event); |
| td_err_e (*td_ta_event_addr_p) (const td_thragent_t *ta, |
| td_event_e event, td_notify_t *ptr); |
| td_err_e (*td_ta_map_lwp2thr_p) (const td_thragent_t *ta, lwpid_t lwpid, |
| td_thrhandle_t *th); |
| td_err_e (*td_thr_get_info_p) (const td_thrhandle_t *th, |
| td_thrinfo_t *infop); |
| td_err_e (*td_thr_event_enable_p) (const td_thrhandle_t *th, int event); |
| 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); |
| td_err_e (*td_thr_tls_get_addr_p) (const td_thrhandle_t *th, |
| psaddr_t map_address, |
| size_t offset, psaddr_t *address); |
| const char ** (*td_symbol_list_p) (void); |
| }; |
| |
| static char *libthread_db_search_path; |
| |
| static int find_one_thread (ptid_t); |
| static int find_new_threads_callback (const td_thrhandle_t *th_p, void *data); |
| |
| static const 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"; |
| #ifdef HAVE_TD_VERSION |
| case TD_VERSION: |
| return "version mismatch between libthread_db and libpthread"; |
| #endif |
| default: |
| xsnprintf (buf, sizeof (buf), "unknown thread_db error '%d'", err); |
| return buf; |
| } |
| } |
| |
| #if 0 |
| 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: |
| xsnprintf (buf, sizeof (buf), "unknown thread_db state %d", state); |
| return buf; |
| } |
| } |
| #endif |
| |
| static int |
| thread_db_create_event (CORE_ADDR where) |
| { |
| td_event_msg_t msg; |
| td_err_e err; |
| struct lwp_info *lwp; |
| struct thread_db *thread_db = current_process ()->private->thread_db; |
| |
| if (thread_db->td_ta_event_getmsg_p == NULL) |
| fatal ("unexpected thread_db->td_ta_event_getmsg_p == NULL"); |
| |
| if (debug_threads) |
| fprintf (stderr, "Thread creation event.\n"); |
| |
| /* FIXME: This assumes we don't get another event. |
| In the LinuxThreads implementation, this is safe, |
| because all events come from the manager thread |
| (except for its own creation, of course). */ |
| err = thread_db->td_ta_event_getmsg_p (thread_db->thread_agent, &msg); |
| if (err != TD_OK) |
| fprintf (stderr, "thread getmsg err: %s\n", |
| thread_db_err_str (err)); |
| |
| /* If we do not know about the main thread yet, this would be a good time to |
| find it. We need to do this to pick up the main thread before any newly |
| created threads. */ |
| lwp = get_thread_lwp (current_inferior); |
| if (lwp->thread_known == 0) |
| find_one_thread (lwp->head.id); |
| |
| /* msg.event == TD_EVENT_CREATE */ |
| |
| find_new_threads_callback (msg.th_p, NULL); |
| |
| return 0; |
| } |
| |
| static int |
| thread_db_enable_reporting (void) |
| { |
| td_thr_events_t events; |
| td_notify_t notify; |
| td_err_e err; |
| struct thread_db *thread_db = current_process ()->private->thread_db; |
| |
| if (thread_db->td_ta_set_event_p == NULL |
| || thread_db->td_ta_event_addr_p == NULL |
| || thread_db->td_ta_event_getmsg_p == NULL) |
| /* This libthread_db is missing required support. */ |
| return 0; |
| |
| /* Set the process wide mask saying which events we're interested in. */ |
| td_event_emptyset (&events); |
| td_event_addset (&events, TD_CREATE); |
| |
| err = thread_db->td_ta_set_event_p (thread_db->thread_agent, &events); |
| if (err != TD_OK) |
| { |
| warning ("Unable to set global thread event mask: %s", |
| thread_db_err_str (err)); |
| return 0; |
| } |
| |
| /* Get address for thread creation breakpoint. */ |
| err = thread_db->td_ta_event_addr_p (thread_db->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 0; |
| } |
| thread_db->td_create_bp |
| = set_breakpoint_at ((CORE_ADDR) (unsigned long) notify.u.bptaddr, |
| thread_db_create_event); |
| |
| return 1; |
| } |
| |
| static int |
| find_one_thread (ptid_t ptid) |
| { |
| td_thrhandle_t th; |
| td_thrinfo_t ti; |
| td_err_e err; |
| struct thread_info *inferior; |
| struct lwp_info *lwp; |
| struct thread_db *thread_db = current_process ()->private->thread_db; |
| int lwpid = ptid_get_lwp (ptid); |
| |
| inferior = (struct thread_info *) find_inferior_id (&all_threads, ptid); |
| lwp = get_thread_lwp (inferior); |
| if (lwp->thread_known) |
| return 1; |
| |
| /* Get information about this thread. */ |
| err = thread_db->td_ta_map_lwp2thr_p (thread_db->thread_agent, lwpid, &th); |
| if (err != TD_OK) |
| error ("Cannot get thread handle for LWP %d: %s", |
| lwpid, thread_db_err_str (err)); |
| |
| err = thread_db->td_thr_get_info_p (&th, &ti); |
| if (err != TD_OK) |
| error ("Cannot get thread info for LWP %d: %s", |
| lwpid, thread_db_err_str (err)); |
| |
| if (debug_threads) |
| fprintf (stderr, "Found thread %ld (LWP %d)\n", |
| ti.ti_tid, ti.ti_lid); |
| |
| if (lwpid != ti.ti_lid) |
| { |
| warning ("PID mismatch! Expected %ld, got %ld", |
| (long) lwpid, (long) ti.ti_lid); |
| return 0; |
| } |
| |
| if (thread_db_use_events) |
| { |
| err = thread_db->td_thr_event_enable_p (&th, 1); |
| if (err != TD_OK) |
| error ("Cannot enable thread event reporting for %d: %s", |
| ti.ti_lid, thread_db_err_str (err)); |
| } |
| |
| /* If the new thread ID is zero, a final thread ID will be available |
| later. Do not enable thread debugging yet. */ |
| if (ti.ti_tid == 0) |
| return 0; |
| |
| lwp->thread_known = 1; |
| lwp->th = th; |
| |
| return 1; |
| } |
| |
| /* Attach a thread. Return true on success. */ |
| |
| static int |
| attach_thread (const td_thrhandle_t *th_p, td_thrinfo_t *ti_p) |
| { |
| struct lwp_info *lwp; |
| |
| if (debug_threads) |
| fprintf (stderr, "Attaching to thread %ld (LWP %d)\n", |
| ti_p->ti_tid, ti_p->ti_lid); |
| linux_attach_lwp (ti_p->ti_lid); |
| lwp = find_lwp_pid (pid_to_ptid (ti_p->ti_lid)); |
| if (lwp == NULL) |
| { |
| warning ("Could not attach to thread %ld (LWP %d)\n", |
| ti_p->ti_tid, ti_p->ti_lid); |
| return 0; |
| } |
| |
| lwp->thread_known = 1; |
| lwp->th = *th_p; |
| |
| if (thread_db_use_events) |
| { |
| td_err_e err; |
| struct thread_db *thread_db = current_process ()->private->thread_db; |
| |
| err = thread_db->td_thr_event_enable_p (th_p, 1); |
| if (err != TD_OK) |
| error ("Cannot enable thread event reporting for %d: %s", |
| ti_p->ti_lid, thread_db_err_str (err)); |
| } |
| |
| return 1; |
| } |
| |
| /* Attach thread if we haven't seen it yet. |
| Increment *COUNTER if we have attached a new thread. |
| Return false on failure. */ |
| |
| static int |
| maybe_attach_thread (const td_thrhandle_t *th_p, td_thrinfo_t *ti_p, |
| int *counter) |
| { |
| struct lwp_info *lwp; |
| |
| lwp = find_lwp_pid (pid_to_ptid (ti_p->ti_lid)); |
| if (lwp != NULL) |
| return 1; |
| |
| if (!attach_thread (th_p, ti_p)) |
| return 0; |
| |
| if (counter != NULL) |
| *counter += 1; |
| |
| return 1; |
| } |
| |
| static int |
| find_new_threads_callback (const td_thrhandle_t *th_p, void *data) |
| { |
| td_thrinfo_t ti; |
| td_err_e err; |
| struct thread_db *thread_db = current_process ()->private->thread_db; |
| |
| err = thread_db->td_thr_get_info_p (th_p, &ti); |
| if (err != TD_OK) |
| error ("Cannot get thread info: %s", thread_db_err_str (err)); |
| |
| /* Check for zombies. */ |
| if (ti.ti_state == TD_THR_UNKNOWN || ti.ti_state == TD_THR_ZOMBIE) |
| return 0; |
| |
| if (!maybe_attach_thread (th_p, &ti, (int *) data)) |
| { |
| /* Terminate iteration early: we might be looking at stale data in |
| the inferior. The thread_db_find_new_threads will retry. */ |
| return 1; |
| } |
| |
| return 0; |
| } |
| |
| static void |
| thread_db_find_new_threads (void) |
| { |
| td_err_e err; |
| ptid_t ptid = ((struct inferior_list_entry *) current_inferior)->id; |
| struct thread_db *thread_db = current_process ()->private->thread_db; |
| int loop, iteration; |
| |
| /* This function is only called when we first initialize thread_db. |
| First locate the initial thread. If it is not ready for |
| debugging yet, then stop. */ |
| if (find_one_thread (ptid) == 0) |
| return; |
| |
| /* Require 4 successive iterations which do not find any new threads. |
| The 4 is a heuristic: there is an inherent race here, and I have |
| seen that 2 iterations in a row are not always sufficient to |
| "capture" all threads. */ |
| for (loop = 0, iteration = 0; loop < 4; ++loop, ++iteration) |
| { |
| int new_thread_count = 0; |
| |
| /* Iterate over all user-space threads to discover new threads. */ |
| err = thread_db->td_ta_thr_iter_p (thread_db->thread_agent, |
| find_new_threads_callback, |
| &new_thread_count, |
| TD_THR_ANY_STATE, TD_THR_LOWEST_PRIORITY, |
| TD_SIGNO_MASK, TD_THR_ANY_USER_FLAGS); |
| if (debug_threads) |
| fprintf (stderr, "Found %d threads in iteration %d.\n", |
| new_thread_count, iteration); |
| |
| if (new_thread_count != 0) |
| { |
| /* Found new threads. Restart iteration from beginning. */ |
| loop = -1; |
| } |
| } |
| if (err != TD_OK) |
| error ("Cannot find new threads: %s", thread_db_err_str (err)); |
| } |
| |
| /* Cache all future symbols that thread_db might request. We can not |
| request symbols at arbitrary states in the remote protocol, only |
| when the client tells us that new symbols are available. So when |
| we load the thread library, make sure to check the entire list. */ |
| |
| static void |
| thread_db_look_up_symbols (void) |
| { |
| struct thread_db *thread_db = current_process ()->private->thread_db; |
| const char **sym_list; |
| CORE_ADDR unused; |
| |
| for (sym_list = thread_db->td_symbol_list_p (); *sym_list; sym_list++) |
| look_up_one_symbol (*sym_list, &unused, 1); |
| |
| /* We're not interested in any other libraries loaded after this |
| point, only in symbols in libpthread.so. */ |
| thread_db->all_symbols_looked_up = 1; |
| } |
| |
| int |
| thread_db_look_up_one_symbol (const char *name, CORE_ADDR *addrp) |
| { |
| struct thread_db *thread_db = current_process ()->private->thread_db; |
| int may_ask_gdb = !thread_db->all_symbols_looked_up; |
| |
| /* If we've passed the call to thread_db_look_up_symbols, then |
| anything not in the cache must not exist; we're not interested |
| in any libraries loaded after that point, only in symbols in |
| libpthread.so. It might not be an appropriate time to look |
| up a symbol, e.g. while we're trying to fetch registers. */ |
| return look_up_one_symbol (name, addrp, may_ask_gdb); |
| } |
| |
| int |
| thread_db_get_tls_address (struct thread_info *thread, CORE_ADDR offset, |
| CORE_ADDR load_module, CORE_ADDR *address) |
| { |
| psaddr_t addr; |
| td_err_e err; |
| struct lwp_info *lwp; |
| struct thread_info *saved_inferior; |
| struct process_info *proc; |
| struct thread_db *thread_db; |
| |
| proc = get_thread_process (thread); |
| thread_db = proc->private->thread_db; |
| |
| /* If the thread layer is not (yet) initialized, fail. */ |
| if (!thread_db->all_symbols_looked_up) |
| return TD_ERR; |
| |
| if (thread_db->td_thr_tls_get_addr_p == NULL) |
| return -1; |
| |
| lwp = get_thread_lwp (thread); |
| if (!lwp->thread_known) |
| find_one_thread (lwp->head.id); |
| if (!lwp->thread_known) |
| return TD_NOTHR; |
| |
| saved_inferior = current_inferior; |
| current_inferior = thread; |
| /* Note the cast through uintptr_t: this interface only works if |
| a target address fits in a psaddr_t, which is a host pointer. |
| So a 32-bit debugger can not access 64-bit TLS through this. */ |
| err = thread_db->td_thr_tls_get_addr_p (&lwp->th, |
| (psaddr_t) (uintptr_t) load_module, |
| offset, &addr); |
| current_inferior = saved_inferior; |
| if (err == TD_OK) |
| { |
| *address = (CORE_ADDR) (uintptr_t) addr; |
| return 0; |
| } |
| else |
| return err; |
| } |
| |
| #ifdef USE_LIBTHREAD_DB_DIRECTLY |
| |
| static int |
| thread_db_load_search (void) |
| { |
| td_err_e err; |
| struct thread_db *tdb; |
| struct process_info *proc = current_process (); |
| |
| if (proc->private->thread_db != NULL) |
| fatal ("unexpected: proc->private->thread_db != NULL"); |
| |
| tdb = xcalloc (1, sizeof (*tdb)); |
| proc->private->thread_db = tdb; |
| |
| tdb->td_ta_new_p = &td_ta_new; |
| |
| /* Attempt to open a connection to the thread library. */ |
| err = tdb->td_ta_new_p (&tdb->proc_handle, &tdb->thread_agent); |
| if (err != TD_OK) |
| { |
| if (debug_threads) |
| fprintf (stderr, "td_ta_new(): %s\n", thread_db_err_str (err)); |
| free (tdb); |
| proc->private->thread_db = NULL; |
| return 0; |
| } |
| |
| tdb->td_ta_map_lwp2thr_p = &td_ta_map_lwp2thr; |
| tdb->td_thr_get_info_p = &td_thr_get_info; |
| tdb->td_ta_thr_iter_p = &td_ta_thr_iter; |
| tdb->td_symbol_list_p = &td_symbol_list; |
| |
| /* This is required only when thread_db_use_events is on. */ |
| tdb->td_thr_event_enable_p = &td_thr_event_enable; |
| |
| /* These are not essential. */ |
| tdb->td_ta_event_addr_p = &td_ta_event_addr; |
| tdb->td_ta_set_event_p = &td_ta_set_event; |
| tdb->td_ta_event_getmsg_p = &td_ta_event_getmsg; |
| tdb->td_thr_tls_get_addr_p = &td_thr_tls_get_addr; |
| |
| return 1; |
| } |
| |
| #else |
| |
| static int |
| try_thread_db_load_1 (void *handle) |
| { |
| td_err_e err; |
| struct thread_db *tdb; |
| struct process_info *proc = current_process (); |
| |
| if (proc->private->thread_db != NULL) |
| fatal ("unexpected: proc->private->thread_db != NULL"); |
| |
| tdb = xcalloc (1, sizeof (*tdb)); |
| proc->private->thread_db = tdb; |
| |
| tdb->handle = handle; |
| |
| /* Initialize pointers to the dynamic library functions we will use. |
| Essential functions first. */ |
| |
| #define CHK(required, a) \ |
| do \ |
| { \ |
| if ((a) == NULL) \ |
| { \ |
| if (debug_threads) \ |
| fprintf (stderr, "dlsym: %s\n", dlerror ()); \ |
| if (required) \ |
| { \ |
| free (tdb); \ |
| proc->private->thread_db = NULL; \ |
| return 0; \ |
| } \ |
| } \ |
| } \ |
| while (0) |
| |
| CHK (1, tdb->td_ta_new_p = dlsym (handle, "td_ta_new")); |
| |
| /* Attempt to open a connection to the thread library. */ |
| err = tdb->td_ta_new_p (&tdb->proc_handle, &tdb->thread_agent); |
| if (err != TD_OK) |
| { |
| if (debug_threads) |
| fprintf (stderr, "td_ta_new(): %s\n", thread_db_err_str (err)); |
| free (tdb); |
| proc->private->thread_db = NULL; |
| return 0; |
| } |
| |
| CHK (1, tdb->td_ta_map_lwp2thr_p = dlsym (handle, "td_ta_map_lwp2thr")); |
| CHK (1, tdb->td_thr_get_info_p = dlsym (handle, "td_thr_get_info")); |
| CHK (1, tdb->td_ta_thr_iter_p = dlsym (handle, "td_ta_thr_iter")); |
| CHK (1, tdb->td_symbol_list_p = dlsym (handle, "td_symbol_list")); |
| |
| /* This is required only when thread_db_use_events is on. */ |
| CHK (thread_db_use_events, |
| tdb->td_thr_event_enable_p = dlsym (handle, "td_thr_event_enable")); |
| |
| /* These are not essential. */ |
| CHK (0, tdb->td_ta_event_addr_p = dlsym (handle, "td_ta_event_addr")); |
| CHK (0, tdb->td_ta_set_event_p = dlsym (handle, "td_ta_set_event")); |
| CHK (0, tdb->td_ta_event_getmsg_p = dlsym (handle, "td_ta_event_getmsg")); |
| CHK (0, tdb->td_thr_tls_get_addr_p = dlsym (handle, "td_thr_tls_get_addr")); |
| |
| #undef CHK |
| |
| return 1; |
| } |
| |
| #ifdef HAVE_DLADDR |
| |
| /* Lookup a library in which given symbol resides. |
| Note: this is looking in the GDBSERVER process, not in the inferior. |
| Returns library name, or NULL. */ |
| |
| static const char * |
| dladdr_to_soname (const void *addr) |
| { |
| Dl_info info; |
| |
| if (dladdr (addr, &info) != 0) |
| return info.dli_fname; |
| return NULL; |
| } |
| |
| #endif |
| |
| static int |
| try_thread_db_load (const char *library) |
| { |
| void *handle; |
| |
| if (debug_threads) |
| fprintf (stderr, "Trying host libthread_db library: %s.\n", |
| library); |
| handle = dlopen (library, RTLD_NOW); |
| if (handle == NULL) |
| { |
| if (debug_threads) |
| fprintf (stderr, "dlopen failed: %s.\n", dlerror ()); |
| return 0; |
| } |
| |
| #ifdef HAVE_DLADDR |
| if (debug_threads && strchr (library, '/') == NULL) |
| { |
| void *td_init; |
| |
| td_init = dlsym (handle, "td_init"); |
| if (td_init != NULL) |
| { |
| const char *const libpath = dladdr_to_soname (td_init); |
| |
| if (libpath != NULL) |
| fprintf (stderr, "Host %s resolved to: %s.\n", |
| library, libpath); |
| } |
| } |
| #endif |
| |
| if (try_thread_db_load_1 (handle)) |
| return 1; |
| |
| /* This library "refused" to work on current inferior. */ |
| dlclose (handle); |
| return 0; |
| } |
| |
| static int |
| thread_db_load_search (void) |
| { |
| char path[PATH_MAX]; |
| const char *search_path; |
| int rc = 0; |
| |
| if (libthread_db_search_path == NULL) |
| libthread_db_search_path = xstrdup (LIBTHREAD_DB_SEARCH_PATH); |
| |
| search_path = libthread_db_search_path; |
| while (*search_path) |
| { |
| const char *end = strchr (search_path, ':'); |
| if (end) |
| { |
| size_t len = end - search_path; |
| if (len + 1 + strlen (LIBTHREAD_DB_SO) + 1 > sizeof (path)) |
| { |
| char *cp = xmalloc (len + 1); |
| memcpy (cp, search_path, len); |
| cp[len] = '\0'; |
| warning ("libthread_db_search_path component too long, " |
| "ignored: %s.", cp); |
| free (cp); |
| search_path += len + 1; |
| continue; |
| } |
| memcpy (path, search_path, len); |
| path[len] = '\0'; |
| search_path += len + 1; |
| } |
| else |
| { |
| size_t len = strlen (search_path); |
| |
| if (len + 1 + strlen (LIBTHREAD_DB_SO) + 1 > sizeof (path)) |
| { |
| warning ("libthread_db_search_path component too long," |
| " ignored: %s.", search_path); |
| break; |
| } |
| memcpy (path, search_path, len + 1); |
| search_path += len; |
| } |
| strcat (path, "/"); |
| strcat (path, LIBTHREAD_DB_SO); |
| if (debug_threads) |
| fprintf (stderr, "thread_db_load_search trying %s\n", path); |
| if (try_thread_db_load (path)) |
| { |
| rc = 1; |
| break; |
| } |
| } |
| if (rc == 0) |
| rc = try_thread_db_load (LIBTHREAD_DB_SO); |
| |
| if (debug_threads) |
| fprintf (stderr, "thread_db_load_search returning %d\n", rc); |
| return rc; |
| } |
| |
| #endif /* USE_LIBTHREAD_DB_DIRECTLY */ |
| |
| int |
| thread_db_init (int use_events) |
| { |
| struct process_info *proc = current_process (); |
| |
| /* FIXME drow/2004-10-16: This is the "overall process ID", which |
| GNU/Linux calls tgid, "thread group ID". When we support |
| attaching to threads, the original thread may not be the correct |
| thread. We would have to get the process ID from /proc for NPTL. |
| For LinuxThreads we could do something similar: follow the chain |
| of parent processes until we find the highest one we're attached |
| to, and use its tgid. |
| |
| This isn't the only place in gdbserver that assumes that the first |
| process in the list is the thread group leader. */ |
| |
| thread_db_use_events = use_events; |
| |
| if (thread_db_load_search ()) |
| { |
| if (use_events && thread_db_enable_reporting () == 0) |
| { |
| /* Keep trying; maybe event reporting will work later. */ |
| thread_db_mourn (proc); |
| return 0; |
| } |
| thread_db_find_new_threads (); |
| thread_db_look_up_symbols (); |
| return 1; |
| } |
| |
| return 0; |
| } |
| |
| static int |
| any_thread_of (struct inferior_list_entry *entry, void *args) |
| { |
| int *pid_p = args; |
| |
| if (ptid_get_pid (entry->id) == *pid_p) |
| return 1; |
| |
| return 0; |
| } |
| |
| static void |
| switch_to_process (struct process_info *proc) |
| { |
| int pid = pid_of (proc); |
| |
| current_inferior = |
| (struct thread_info *) find_inferior (&all_threads, |
| any_thread_of, &pid); |
| } |
| |
| /* Disconnect from libthread_db and free resources. */ |
| |
| static void |
| disable_thread_event_reporting (struct process_info *proc) |
| { |
| struct thread_db *thread_db = proc->private->thread_db; |
| if (thread_db) |
| { |
| td_err_e (*td_ta_clear_event_p) (const td_thragent_t *ta, |
| td_thr_events_t *event); |
| |
| #ifndef USE_LIBTHREAD_DB_DIRECTLY |
| td_ta_clear_event_p = dlsym (thread_db->handle, "td_ta_clear_event"); |
| #else |
| td_ta_clear_event_p = &td_ta_clear_event; |
| #endif |
| |
| if (td_ta_clear_event_p != NULL) |
| { |
| struct thread_info *saved_inferior = current_inferior; |
| td_thr_events_t events; |
| |
| switch_to_process (proc); |
| |
| /* Set the process wide mask saying we aren't interested |
| in any events anymore. */ |
| td_event_fillset (&events); |
| (*td_ta_clear_event_p) (thread_db->thread_agent, &events); |
| |
| current_inferior = saved_inferior; |
| } |
| } |
| } |
| |
| static void |
| remove_thread_event_breakpoints (struct process_info *proc) |
| { |
| struct thread_db *thread_db = proc->private->thread_db; |
| |
| if (thread_db->td_create_bp != NULL) |
| { |
| struct thread_info *saved_inferior = current_inferior; |
| |
| switch_to_process (proc); |
| |
| delete_breakpoint (thread_db->td_create_bp); |
| thread_db->td_create_bp = NULL; |
| |
| current_inferior = saved_inferior; |
| } |
| } |
| |
| void |
| thread_db_detach (struct process_info *proc) |
| { |
| struct thread_db *thread_db = proc->private->thread_db; |
| |
| if (thread_db) |
| { |
| disable_thread_event_reporting (proc); |
| remove_thread_event_breakpoints (proc); |
| } |
| } |
| |
| /* Disconnect from libthread_db and free resources. */ |
| |
| void |
| thread_db_mourn (struct process_info *proc) |
| { |
| struct thread_db *thread_db = proc->private->thread_db; |
| if (thread_db) |
| { |
| td_err_e (*td_ta_delete_p) (td_thragent_t *); |
| |
| #ifndef USE_LIBTHREAD_DB_DIRECTLY |
| td_ta_delete_p = dlsym (thread_db->handle, "td_ta_delete"); |
| #else |
| td_ta_delete_p = &td_ta_delete; |
| #endif |
| |
| if (td_ta_delete_p != NULL) |
| (*td_ta_delete_p) (thread_db->thread_agent); |
| |
| #ifndef USE_LIBTHREAD_DB_DIRECTLY |
| dlclose (thread_db->handle); |
| #endif /* USE_LIBTHREAD_DB_DIRECTLY */ |
| |
| free (thread_db); |
| proc->private->thread_db = NULL; |
| } |
| } |
| |
| /* Handle "set libthread-db-search-path" monitor command and return 1. |
| For any other command, return 0. */ |
| |
| int |
| thread_db_handle_monitor_command (char *mon) |
| { |
| if (strncmp (mon, "set libthread-db-search-path ", 29) == 0) |
| { |
| const char *cp = mon + 29; |
| |
| if (libthread_db_search_path != NULL) |
| free (libthread_db_search_path); |
| |
| /* Skip leading space (if any). */ |
| while (isspace (*cp)) |
| ++cp; |
| |
| libthread_db_search_path = xstrdup (cp); |
| |
| monitor_output ("libthread-db-search-path set to `"); |
| monitor_output (libthread_db_search_path); |
| monitor_output ("'\n"); |
| return 1; |
| } |
| |
| /* Tell server.c to perform default processing. */ |
| return 0; |
| } |