| /* libthread_db assisted debugging support, generic parts. |
| |
| Copyright 1999, 2000, 2001, 2003, 2004 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 "exceptions.h" |
| #include "gdbthread.h" |
| #include "inferior.h" |
| #include "symfile.h" |
| #include "objfiles.h" |
| #include "target.h" |
| #include "regcache.h" |
| #include "solib-svr4.h" |
| |
| #ifdef HAVE_GNU_LIBC_VERSION_H |
| #include <gnu/libc-version.h> |
| #endif |
| |
| #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 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); |
| |
| static td_err_e (*td_thr_tls_get_addr_p) (const td_thrhandle_t *th, |
| 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 |
| 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); |
| static void attach_thread (ptid_t ptid, const td_thrhandle_t *th_p, |
| const td_thrinfo_t *ti_p, int verbose); |
| static void detach_thread (ptid_t ptid, int verbose); |
| |
| |
| /* 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) |
| |
| |
| /* Use "struct private_thread_info" to cache thread state. This is |
| a substantial optimization. */ |
| |
| struct private_thread_info |
| { |
| /* Flag set when we see a TD_DEATH event for this thread. */ |
| unsigned int dying:1; |
| |
| /* Cached thread state. */ |
| unsigned int th_valid:1; |
| unsigned int ti_valid:1; |
| |
| td_thrhandle_t th; |
| td_thrinfo_t ti; |
| }; |
| |
| |
| 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; |
| } |
| } |
| |
| /* A callback function for td_ta_thr_iter, which we use to map all |
| 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 |
| *INFOP. |
| |
| If the thread is a zombie, TD_THR_ZOMBIE is returned. Otherwise, |
| zero is returned to indicate success. */ |
| |
| static int |
| thread_get_info_callback (const td_thrhandle_t *thp, void *infop) |
| { |
| td_thrinfo_t ti; |
| td_err_e err; |
| struct thread_info *thread_info; |
| ptid_t thread_ptid; |
| |
| err = td_thr_get_info_p (thp, &ti); |
| if (err != TD_OK) |
| error (_("thread_get_info_callback: cannot get thread info: %s"), |
| thread_db_err_str (err)); |
| |
| /* Fill the cache. */ |
| thread_ptid = ptid_build (GET_PID (inferior_ptid), ti.ti_lid, ti.ti_tid); |
| thread_info = find_thread_pid (thread_ptid); |
| |
| /* In the case of a zombie thread, don't continue. We don't want to |
| attach to it thinking it is a new thread. */ |
| if (ti.ti_state == TD_THR_UNKNOWN || ti.ti_state == TD_THR_ZOMBIE) |
| { |
| if (infop != NULL) |
| *(struct thread_info **) infop = thread_info; |
| if (thread_info != NULL) |
| { |
| memcpy (&thread_info->private->th, thp, sizeof (*thp)); |
| thread_info->private->th_valid = 1; |
| memcpy (&thread_info->private->ti, &ti, sizeof (ti)); |
| thread_info->private->ti_valid = 1; |
| } |
| return TD_THR_ZOMBIE; |
| } |
| |
| if (thread_info == NULL) |
| { |
| /* New thread. Attach to it now (why wait?). */ |
| attach_thread (thread_ptid, thp, &ti, 1); |
| thread_info = find_thread_pid (thread_ptid); |
| gdb_assert (thread_info != NULL); |
| } |
| |
| memcpy (&thread_info->private->th, thp, sizeof (*thp)); |
| thread_info->private->th_valid = 1; |
| memcpy (&thread_info->private->ti, &ti, sizeof (ti)); |
| thread_info->private->ti_valid = 1; |
| |
| if (infop != NULL) |
| *(struct thread_info **) infop = thread_info; |
| |
| return 0; |
| } |
| |
| /* Accessor functions for the thread_db information, with caching. */ |
| |
| static void |
| thread_db_map_id2thr (struct thread_info *thread_info, int fatal) |
| { |
| td_err_e err; |
| |
| if (thread_info->private->th_valid) |
| return; |
| |
| err = td_ta_map_id2thr_p (thread_agent, GET_THREAD (thread_info->ptid), |
| &thread_info->private->th); |
| if (err != TD_OK) |
| { |
| if (fatal) |
| error (_("Cannot find thread %ld: %s"), |
| (long) GET_THREAD (thread_info->ptid), |
| thread_db_err_str (err)); |
| } |
| else |
| thread_info->private->th_valid = 1; |
| } |
| |
| static td_thrinfo_t * |
| thread_db_get_info (struct thread_info *thread_info) |
| { |
| td_err_e err; |
| |
| if (thread_info->private->ti_valid) |
| return &thread_info->private->ti; |
| |
| 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); |
| if (err != TD_OK) |
| error (_("thread_db_get_info: cannot get thread info: %s"), |
| thread_db_err_str (err)); |
| |
| thread_info->private->ti_valid = 1; |
| return &thread_info->private->ti; |
| } |
| |
| /* Convert between user-level thread ids and LWP ids. */ |
| |
| static ptid_t |
| thread_from_lwp (ptid_t ptid) |
| { |
| td_thrhandle_t th; |
| td_err_e err; |
| struct thread_info *thread_info; |
| ptid_t thread_ptid; |
| |
| 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 %ld: %s"), |
| GET_LWP (ptid), thread_db_err_str (err)); |
| |
| thread_info = NULL; |
| |
| /* Fetch the thread info. If we get back TD_THR_ZOMBIE, then the |
| event thread has already died. If another gdb interface has called |
| thread_alive() previously, the thread won't be found on the thread list |
| anymore. In that case, we don't want to process this ptid anymore |
| to avoid the possibility of later treating it as a newly |
| discovered thread id that we should add to the list. Thus, |
| we return a -1 ptid which is also how the thread list marks a |
| dead thread. */ |
| if (thread_get_info_callback (&th, &thread_info) == TD_THR_ZOMBIE |
| && thread_info == NULL) |
| return pid_to_ptid (-1); |
| |
| gdb_assert (thread_info && thread_info->private->ti_valid); |
| |
| return ptid_build (GET_PID (ptid), GET_LWP (ptid), |
| thread_info->private->ti.ti_tid); |
| } |
| |
| static ptid_t |
| lwp_from_thread (ptid_t ptid) |
| { |
| return BUILD_LWP (GET_LWP (ptid), GET_PID (ptid)); |
| } |
| |
| |
| void |
| thread_db_init (struct target_ops *target) |
| { |
| 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) |
| { |
| void *handle; |
| td_err_e err; |
| |
| handle = dlopen (LIBTHREAD_DB_SO, RTLD_NOW); |
| if (handle == NULL) |
| { |
| fprintf_filtered (gdb_stderr, "\n\ndlopen failed on '%s' - %s\n", |
| LIBTHREAD_DB_SO, dlerror ()); |
| 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 = verbose_dlsym (handle, "td_init"); |
| if (td_init_p == NULL) |
| return 0; |
| |
| td_ta_new_p = verbose_dlsym (handle, "td_ta_new"); |
| if (td_ta_new_p == NULL) |
| return 0; |
| |
| 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 = verbose_dlsym (handle, "td_ta_map_lwp2thr"); |
| if (td_ta_map_lwp2thr_p == NULL) |
| return 0; |
| |
| 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 = verbose_dlsym (handle, "td_thr_validate"); |
| if (td_thr_validate_p == NULL) |
| return 0; |
| |
| 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 = verbose_dlsym (handle, "td_thr_getfpregs"); |
| if (td_thr_getfpregs_p == NULL) |
| return 0; |
| |
| td_thr_getgregs_p = verbose_dlsym (handle, "td_thr_getgregs"); |
| if (td_thr_getgregs_p == NULL) |
| return 0; |
| |
| td_thr_setfpregs_p = verbose_dlsym (handle, "td_thr_setfpregs"); |
| if (td_thr_setfpregs_p == NULL) |
| return 0; |
| |
| td_thr_setgregs_p = verbose_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"); |
| td_thr_tls_get_addr_p = dlsym (handle, "td_thr_tls_get_addr"); |
| |
| 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) |
| { |
| td_thr_events_t events; |
| td_notify_t notify; |
| td_err_e err; |
| #ifdef HAVE_GNU_LIBC_VERSION_H |
| const char *libc_version; |
| int libc_major, libc_minor; |
| #endif |
| |
| /* 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); |
| |
| #ifdef HAVE_GNU_LIBC_VERSION_H |
| /* 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. */ |
| libc_version = gnu_get_libc_version (); |
| if (sscanf (libc_version, "%d.%d", &libc_major, &libc_minor) == 2 |
| && (libc_major > 2 || (libc_major == 2 && libc_minor > 1))) |
| #endif |
| td_event_addset (&events, TD_DEATH); |
| |
| 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 (); |
| td_create_bp_addr = 0; |
| td_death_bp_addr = 0; |
| |
| /* 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"), |
| thread_db_err_str (err)); |
| return; |
| } |
| |
| /* 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; |
| } |
| } |
| |
| 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 |
| thread_db_new_objfile (struct objfile *objfile) |
| { |
| 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) |
| { |
| /* 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; |
| } |
| |
| 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: |
| 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; |
| |
| 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); |
| } |
| |
| /* Attach to a new thread. This function is called when we receive a |
| TD_CREATE event or when we iterate over all threads and find one |
| that wasn't already in our list. */ |
| |
| 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; |
| |
| /* If we're being called after a TD_CREATE event, we may already |
| know about this thread. There are two ways this can happen. We |
| may have iterated over all threads between the thread creation |
| and the TD_CREATE event, for instance when the user has issued |
| the `info threads' command before the SIGTRAP for hitting the |
| thread creation breakpoint was reported. Alternatively, the |
| thread may have exited and a new one been created with the same |
| thread ID. In the first case we don't need to do anything; in |
| the second case we should discard information about the dead |
| thread and attach to the new one. */ |
| if (in_thread_list (ptid)) |
| { |
| tp = find_thread_pid (ptid); |
| gdb_assert (tp != NULL); |
| |
| if (!tp->private->dying) |
| return; |
| |
| delete_thread (ptid); |
| } |
| |
| check_thread_signals (); |
| |
| /* Add the thread to GDB's thread list. */ |
| tp = add_thread (ptid); |
| tp->private = xmalloc (sizeof (struct private_thread_info)); |
| memset (tp->private, 0, sizeof (struct private_thread_info)); |
| |
| if (verbose) |
| printf_unfiltered (_("[New %s]\n"), target_pid_to_str (ptid)); |
| |
| 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) |
| { |
| struct thread_info *thread_info; |
| |
| if (verbose) |
| printf_unfiltered (_("[%s exited]\n"), target_pid_to_str (ptid)); |
| |
| /* Don't delete the thread now, because it still reports as active |
| until it has executed a few instructions after the event |
| breakpoint - if we deleted it now, "info threads" would cause us |
| to re-attach to it. Just mark it as having had a TD_DEATH |
| event. This means that we won't delete it from our thread list |
| until we notice that it's dead (via prune_threads), or until |
| something re-uses its thread ID. */ |
| thread_info = find_thread_pid (ptid); |
| gdb_assert (thread_info != NULL); |
| thread_info->private->dying = 1; |
| } |
| |
| 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 int |
| clear_lwpid_callback (struct thread_info *thread, void *dummy) |
| { |
| /* If we know that our thread implementation is 1-to-1, we could save |
| a certain amount of information; it's not clear how much, so we |
| are always conservative. */ |
| |
| thread->private->th_valid = 0; |
| thread->private->ti_valid = 0; |
| |
| return 0; |
| } |
| |
| 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); |
| |
| /* Clear cached data which may not be valid after the resume. */ |
| iterate_over_threads (clear_lwpid_callback, NULL); |
| |
| 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; |
| 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; |
| |
| /* 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 |
| { |
| 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 = ptid_build (GET_PID (ptid), ti.ti_lid, ti.ti_tid); |
| |
| switch (msg.event) |
| { |
| case TD_CREATE: |
| /* Call attach_thread whether or not we already know about a |
| thread with this thread ID. */ |
| attach_thread (ptid, msg.th_p, &ti, 1); |
| |
| break; |
| |
| case TD_DEATH: |
| |
| if (!in_thread_list (ptid)) |
| error (_("Spurious thread death event.")); |
| |
| detach_thread (ptid, 1); |
| |
| break; |
| |
| default: |
| error (_("Spurious thread event.")); |
| } |
| } |
| while (loop); |
| } |
| |
| 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); |
| |
| /* Change the ptid back into the higher level PID + TID format. |
| If the thread is dead and no longer on the thread list, we will |
| get back a dead ptid. This can occur if the thread death event |
| gets postponed by other simultaneous events. In such a case, |
| we want to just ignore the event and continue on. */ |
| ptid = thread_from_lwp (ptid); |
| if (GET_PID (ptid) == -1) |
| ourstatus->kind = TARGET_WAITKIND_SPURIOUS; |
| |
| return ptid; |
| } |
| |
| static int |
| thread_db_xfer_memory (CORE_ADDR memaddr, gdb_byte *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->deprecated_xfer_memory (memaddr, myaddr, len, write, |
| attrib, target); |
| |
| do_cleanups (old_chain); |
| return xfer; |
| } |
| |
| static void |
| thread_db_fetch_registers (int regno) |
| { |
| struct thread_info *thread_info; |
| 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; |
| } |
| |
| thread_info = find_thread_pid (inferior_ptid); |
| thread_db_map_id2thr (thread_info, 1); |
| |
| err = td_thr_getgregs_p (&thread_info->private->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 (&thread_info->private->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) |
| { |
| prgregset_t gregset; |
| gdb_prfpregset_t fpregset; |
| td_err_e err; |
| struct thread_info *thread_info; |
| |
| if (!is_thread (inferior_ptid)) |
| { |
| /* Pass the request to the target beneath us. */ |
| target_beneath->to_store_registers (regno); |
| return; |
| } |
| |
| thread_info = find_thread_pid (inferior_ptid); |
| thread_db_map_id2thr (thread_info, 1); |
| |
| if (regno != -1) |
| { |
| char raw[MAX_REGISTER_SIZE]; |
| |
| deprecated_read_register_gen (regno, raw); |
| thread_db_fetch_registers (-1); |
| regcache_raw_supply (current_regcache, regno, raw); |
| } |
| |
| fill_gregset ((gdb_gregset_t *) gregset, -1); |
| fill_fpregset (&fpregset, -1); |
| |
| err = td_thr_setgregs_p (&thread_info->private->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 (&thread_info->private->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, |
| int from_tty) |
| { |
| unpush_target (&thread_db_ops); |
| using_thread_db = 0; |
| target_beneath->to_create_inferior (exec_file, allargs, env, from_tty); |
| } |
| |
| 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 (); |
| |
| /* Detach thread_db target ops. */ |
| unpush_target (&thread_db_ops); |
| using_thread_db = 0; |
| } |
| |
| static int |
| thread_db_thread_alive (ptid_t ptid) |
| { |
| td_thrhandle_t th; |
| td_err_e err; |
| |
| if (is_thread (ptid)) |
| { |
| struct thread_info *thread_info; |
| thread_info = find_thread_pid (ptid); |
| |
| thread_db_map_id2thr (thread_info, 0); |
| 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) |
| { |
| 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; |
| } |
| |
| if (thread_info->private->ti.ti_state == TD_THR_UNKNOWN |
| || thread_info->private->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 (_("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) |
| return 0; /* A zombie -- ignore. */ |
| |
| ptid = ptid_build (GET_PID (inferior_ptid), ti.ti_lid, ti.ti_tid); |
| |
| 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_thrinfo_t *ti_p; |
| td_err_e err; |
| struct thread_info *thread_info; |
| |
| thread_info = find_thread_pid (ptid); |
| thread_db_map_id2thr (thread_info, 0); |
| if (!thread_info->private->th_valid) |
| { |
| snprintf (buf, sizeof (buf), "Thread %ld (Missing)", |
| GET_THREAD (ptid)); |
| return buf; |
| } |
| |
| ti_p = thread_db_get_info (thread_info); |
| |
| if (ti_p->ti_state == TD_THR_ACTIVE && ti_p->ti_lid != 0) |
| { |
| snprintf (buf, sizeof (buf), "Thread %ld (LWP %d)", |
| (long) ti_p->ti_tid, ti_p->ti_lid); |
| } |
| else |
| { |
| snprintf (buf, sizeof (buf), "Thread %ld (%s)", |
| (long) ti_p->ti_tid, |
| thread_db_state_str (ti_p->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); |
| } |
| |
| /* Get the address of the thread local variable in load module LM which |
| is stored at OFFSET within the thread local storage for thread PTID. */ |
| |
| static CORE_ADDR |
| thread_db_get_thread_local_address (ptid_t ptid, |
| CORE_ADDR lm, |
| CORE_ADDR offset) |
| { |
| if (is_thread (ptid)) |
| { |
| td_err_e err; |
| void *address; |
| struct thread_info *thread_info; |
| |
| /* glibc doesn't provide the needed interface. */ |
| if (!td_thr_tls_get_addr_p) |
| throw_error (TLS_NO_LIBRARY_SUPPORT_ERROR, |
| _("No TLS library support")); |
| |
| /* Caller should have verified that lm != 0. */ |
| gdb_assert (lm != 0); |
| |
| /* Get info about the thread. */ |
| thread_info = find_thread_pid (ptid); |
| thread_db_map_id2thr (thread_info, 1); |
| |
| /* Finally, get the address of the variable. */ |
| err = td_thr_tls_get_addr_p (&thread_info->private->th, (void *) lm, |
| offset, &address); |
| |
| #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. */ |
| throw_error (TLS_NOT_ALLOCATED_YET_ERROR, |
| _("TLS not allocated yet")); |
| #endif |
| |
| /* Something else went wrong. */ |
| if (err != TD_OK) |
| throw_error (TLS_GENERIC_ERROR, |
| (("%s")), thread_db_err_str (err)); |
| |
| /* Cast assuming host == target. Joy. */ |
| return (CORE_ADDR) address; |
| } |
| |
| if (target_beneath->to_get_thread_local_address) |
| return target_beneath->to_get_thread_local_address (ptid, lm, offset); |
| else |
| throw_error (TLS_GENERIC_ERROR, |
| _("TLS not supported on this target")); |
| } |
| |
| 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.deprecated_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_get_thread_local_address |
| = thread_db_get_thread_local_address; |
| 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 = deprecated_target_new_objfile_hook; |
| deprecated_target_new_objfile_hook = thread_db_new_objfile; |
| } |
| } |