mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-11-23 18:14:13 +08:00
bda9cb723c
* thread-db.c: Various comment fixes and additions. Include "bfd.h", "symfile.h" and "objfiles.h". (keep_thread_db): New variable. (find_new_threads_callback): Remove prototype. (thread_db_find_new_threads): New prototype. (thread_db_push_target, thread_db_unpush_target): Remove functions. (deactivate_target): New function. (thread_db_new_objfile): If OBJFILE == NULL, force deactivation of target vector. Activate target vector directly instead of calling thread_db_push_target. Set keep_thread_db if thread library is detected in the main symbol file. Only enable thread event reporting if there actually is a child process. Likewise for detecting new threads, done by calling thread_db_find_new_threads instead of iterating over the threads ourselves. (thread_db_detach): Call deactivate_target instead of thread_db_unpush_target. (thread_db_wait): Bail out early if we're not debugging the multi-threaded child process yet. (thread_db_post_startup_inferior): New function. (thread_db_mourn_inferior): Call deactivate_target instead of thread_db_unpush_target. (init_thread_db_ops): Add thread_db_post_startup_inferior to thread_db_ops.
1027 lines
27 KiB
C
1027 lines
27 KiB
C
/* libthread_db assisted debugging support, generic parts.
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Copyright 1999, 2000 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include "defs.h"
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#include "gdb_assert.h"
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#include <dlfcn.h>
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#include "gdb_proc_service.h"
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#include "gdb_thread_db.h"
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#include "bfd.h"
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#include "gdbthread.h"
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#include "inferior.h"
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#include "symfile.h"
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#include "objfiles.h"
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#include "target.h"
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#ifndef LIBTHREAD_DB_SO
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#define LIBTHREAD_DB_SO "libthread_db.so.1"
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#endif
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/* If we're running on Linux, we must explicitly attach to any new threads. */
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/* FIXME: There is certainly some room for improvements:
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- Cache LWP ids.
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- Bypass libthread_db when fetching or storing registers for
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threads bound to a LWP. */
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/* This module's target vector. */
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static struct target_ops thread_db_ops;
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/* The target vector that we call for things this module can't handle. */
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static struct target_ops *target_beneath;
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/* Pointer to the next function on the objfile event chain. */
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static void (*target_new_objfile_chain) (struct objfile *objfile);
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/* Non-zero if we're using this module's target vector. */
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static int using_thread_db;
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/* Non-zero if we musn't deactivate this module's target vector. */
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static int keep_thread_db;
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/* Non-zero if we have determined the signals used by the threads
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library. */
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static int thread_signals;
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static sigset_t thread_stop_set;
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static sigset_t thread_print_set;
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/* Structure that identifies the child process for the
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<proc_service.h> interface. */
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static struct ps_prochandle proc_handle;
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/* Connection to the libthread_db library. */
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static td_thragent_t *thread_agent;
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/* Pointers to the libthread_db functions. */
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static td_err_e (*td_init_p) (void);
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static td_err_e (*td_ta_new_p) (struct ps_prochandle *ps, td_thragent_t **ta);
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static td_err_e (*td_ta_map_id2thr_p) (const td_thragent_t *ta, thread_t pt,
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td_thrhandle_t *__th);
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static td_err_e (*td_ta_map_lwp2thr_p) (const td_thragent_t *ta, lwpid_t lwpid,
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td_thrhandle_t *th);
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static td_err_e (*td_ta_thr_iter_p) (const td_thragent_t *ta,
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td_thr_iter_f *callback,
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void *cbdata_p, td_thr_state_e state,
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int ti_pri, sigset_t *ti_sigmask_p,
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unsigned int ti_user_flags);
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static td_err_e (*td_ta_event_addr_p) (const td_thragent_t *ta,
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td_event_e event, td_notify_t *ptr);
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static td_err_e (*td_ta_set_event_p) (const td_thragent_t *ta,
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td_thr_events_t *event);
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static td_err_e (*td_ta_event_getmsg_p) (const td_thragent_t *ta,
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td_event_msg_t *msg);
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static td_err_e (*td_thr_validate_p) (const td_thrhandle_t *th);
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static td_err_e (*td_thr_get_info_p) (const td_thrhandle_t *th,
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td_thrinfo_t *infop);
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static td_err_e (*td_thr_getfpregs_p) (const td_thrhandle_t *th,
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gdb_prfpregset_t *regset);
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static td_err_e (*td_thr_getgregs_p) (const td_thrhandle_t *th,
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prgregset_t gregs);
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static td_err_e (*td_thr_setfpregs_p) (const td_thrhandle_t *th,
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const gdb_prfpregset_t *fpregs);
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static td_err_e (*td_thr_setgregs_p) (const td_thrhandle_t *th,
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prgregset_t gregs);
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static td_err_e (*td_thr_event_enable_p) (const td_thrhandle_t *th, int event);
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/* Location of the thread creation event breakpoint. The code at this
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location in the child process will be called by the pthread library
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whenever a new thread is created. By setting a special breakpoint
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at this location, GDB can detect when a new thread is created. We
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obtain this location via the td_ta_event_addr call. */
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static CORE_ADDR td_create_bp_addr;
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/* Location of the thread death event breakpoint. */
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static CORE_ADDR td_death_bp_addr;
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/* Prototypes for local functions. */
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static void thread_db_find_new_threads (void);
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/* Building process ids. */
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#ifndef TIDGET
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#define TIDGET(PID) (((PID) & 0x7fffffff) >> 16)
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#define PIDGET(PID) (((PID) & 0xffff))
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#define MERGEPID(PID, TID) (((PID) & 0xffff) | ((TID) << 16))
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#endif
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#define THREAD_FLAG 0x80000000
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#define is_lwp(pid) (((pid) & THREAD_FLAG) == 0 && TIDGET (pid))
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#define is_thread(pid) ((pid) & THREAD_FLAG)
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#define GET_PID(pid) PIDGET (pid)
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#define GET_LWP(pid) TIDGET (pid)
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#define GET_THREAD(pid) TIDGET (pid)
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#define BUILD_LWP(tid, pid) MERGEPID (pid, tid)
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#define BUILD_THREAD(tid, pid) (MERGEPID (pid, tid) | THREAD_FLAG)
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struct private_thread_info
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{
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/* Cached LWP id. Must come first, see lin-lwp.c. */
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lwpid_t lwpid;
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};
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/* Helper functions. */
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static void
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restore_inferior_pid (void *arg)
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{
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int *saved_pid_ptr = arg;
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inferior_pid = *saved_pid_ptr;
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xfree (arg);
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}
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static struct cleanup *
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save_inferior_pid (void)
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{
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int *saved_pid_ptr;
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saved_pid_ptr = xmalloc (sizeof (int));
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*saved_pid_ptr = inferior_pid;
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return make_cleanup (restore_inferior_pid, saved_pid_ptr);
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}
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static char *
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thread_db_err_str (td_err_e err)
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{
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static char buf[64];
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switch (err)
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{
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case TD_OK:
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return "generic 'call succeeded'";
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case TD_ERR:
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return "generic error";
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case TD_NOTHR:
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return "no thread to satisfy query";
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case TD_NOSV:
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return "no sync handle to satisfy query";
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case TD_NOLWP:
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return "no LWP to satisfy query";
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case TD_BADPH:
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return "invalid process handle";
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case TD_BADTH:
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return "invalid thread handle";
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case TD_BADSH:
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return "invalid synchronization handle";
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case TD_BADTA:
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return "invalid thread agent";
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case TD_BADKEY:
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return "invalid key";
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case TD_NOMSG:
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return "no event message for getmsg";
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case TD_NOFPREGS:
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return "FPU register set not available";
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case TD_NOLIBTHREAD:
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return "application not linked with libthread";
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case TD_NOEVENT:
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return "requested event is not supported";
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case TD_NOCAPAB:
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return "capability not available";
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case TD_DBERR:
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return "debugger service failed";
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case TD_NOAPLIC:
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return "operation not applicable to";
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case TD_NOTSD:
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return "no thread-specific data for this thread";
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case TD_MALLOC:
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return "malloc failed";
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case TD_PARTIALREG:
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return "only part of register set was written/read";
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case TD_NOXREGS:
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return "X register set not available for this thread";
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default:
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snprintf (buf, sizeof (buf), "unknown thread_db error '%d'", err);
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return buf;
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}
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}
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static char *
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thread_db_state_str (td_thr_state_e state)
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{
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static char buf[64];
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switch (state)
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{
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case TD_THR_STOPPED:
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return "stopped by debugger";
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case TD_THR_RUN:
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return "runnable";
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case TD_THR_ACTIVE:
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return "active";
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case TD_THR_ZOMBIE:
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return "zombie";
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case TD_THR_SLEEP:
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return "sleeping";
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case TD_THR_STOPPED_ASLEEP:
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return "stopped by debugger AND blocked";
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default:
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snprintf (buf, sizeof (buf), "unknown thread_db state %d", state);
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return buf;
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}
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}
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/* Convert between user-level thread ids and LWP ids. */
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static int
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thread_from_lwp (int pid)
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{
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td_thrinfo_t ti;
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td_thrhandle_t th;
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td_err_e err;
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if (GET_LWP (pid) == 0)
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pid = BUILD_LWP (pid, pid);
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gdb_assert (is_lwp (pid));
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err = td_ta_map_lwp2thr_p (thread_agent, GET_LWP (pid), &th);
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if (err != TD_OK)
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error ("Cannot find user-level thread for LWP %d: %s",
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GET_LWP (pid), thread_db_err_str (err));
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err = td_thr_get_info_p (&th, &ti);
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if (err != TD_OK)
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error ("Cannot get thread info: %s", thread_db_err_str (err));
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return BUILD_THREAD (ti.ti_tid, GET_PID (pid));
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}
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static int
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lwp_from_thread (int pid)
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{
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td_thrinfo_t ti;
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td_thrhandle_t th;
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td_err_e err;
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if (! is_thread (pid))
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return pid;
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err = td_ta_map_id2thr_p (thread_agent, GET_THREAD (pid), &th);
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if (err != TD_OK)
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error ("Cannot find thread %ld: %s",
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(long) GET_THREAD (pid), thread_db_err_str (err));
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err = td_thr_get_info_p (&th, &ti);
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if (err != TD_OK)
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error ("Cannot get thread info: %s", thread_db_err_str (err));
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return BUILD_LWP (ti.ti_lid, GET_PID (pid));
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}
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void
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thread_db_init (struct target_ops *target)
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{
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target_beneath = target;
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}
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static int
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thread_db_load (void)
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{
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void *handle;
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td_err_e err;
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handle = dlopen (LIBTHREAD_DB_SO, RTLD_NOW);
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if (handle == NULL)
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return 0;
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/* Initialize pointers to the dynamic library functions we will use.
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Essential functions first. */
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td_init_p = dlsym (handle, "td_init");
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if (td_init_p == NULL)
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return 0;
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td_ta_new_p = dlsym (handle, "td_ta_new");
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if (td_ta_new_p == NULL)
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return 0;
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td_ta_map_id2thr_p = dlsym (handle, "td_ta_map_id2thr");
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if (td_ta_map_id2thr_p == NULL)
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return 0;
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td_ta_map_lwp2thr_p = dlsym (handle, "td_ta_map_lwp2thr");
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if (td_ta_map_lwp2thr_p == NULL)
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return 0;
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td_ta_thr_iter_p = dlsym (handle, "td_ta_thr_iter");
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if (td_ta_thr_iter_p == NULL)
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return 0;
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td_thr_validate_p = dlsym (handle, "td_thr_validate");
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if (td_thr_validate_p == NULL)
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return 0;
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td_thr_get_info_p = dlsym (handle, "td_thr_get_info");
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if (td_thr_get_info_p == NULL)
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return 0;
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td_thr_getfpregs_p = dlsym (handle, "td_thr_getfpregs");
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if (td_thr_getfpregs_p == NULL)
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return 0;
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td_thr_getgregs_p = dlsym (handle, "td_thr_getgregs");
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if (td_thr_getgregs_p == NULL)
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return 0;
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td_thr_setfpregs_p = dlsym (handle, "td_thr_setfpregs");
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if (td_thr_setfpregs_p == NULL)
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return 0;
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td_thr_setgregs_p = dlsym (handle, "td_thr_setgregs");
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if (td_thr_setgregs_p == NULL)
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return 0;
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/* Initialize the library. */
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err = td_init_p ();
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if (err != TD_OK)
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{
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warning ("Cannot initialize libthread_db: %s", thread_db_err_str (err));
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return 0;
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}
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/* These are not essential. */
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td_ta_event_addr_p = dlsym (handle, "td_ta_event_addr");
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td_ta_set_event_p = dlsym (handle, "td_ta_set_event");
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td_ta_event_getmsg_p = dlsym (handle, "td_ta_event_getmsg");
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td_thr_event_enable_p = dlsym (handle, "td_thr_event_enable");
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return 1;
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}
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static void
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enable_thread_event_reporting (void)
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{
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td_thr_events_t events;
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td_notify_t notify;
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td_err_e err;
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/* We cannot use the thread event reporting facility if these
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functions aren't available. */
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if (td_ta_event_addr_p == NULL || td_ta_set_event_p == NULL
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|| td_ta_event_getmsg_p == NULL || td_thr_event_enable_p == NULL)
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return;
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/* Set the process wide mask saying which events we're interested in. */
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td_event_emptyset (&events);
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td_event_addset (&events, TD_CREATE);
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#if 0
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/* FIXME: kettenis/2000-04-23: The event reporting facility is
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broken for TD_DEATH events in glibc 2.1.3, so don't enable it for
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now. */
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td_event_addset (&events, TD_DEATH);
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#endif
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err = td_ta_set_event_p (thread_agent, &events);
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if (err != TD_OK)
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{
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warning ("Unable to set global thread event mask: %s",
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thread_db_err_str (err));
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return;
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}
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/* Delete previous thread event breakpoints, if any. */
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remove_thread_event_breakpoints ();
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/* Get address for thread creation breakpoint. */
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err = td_ta_event_addr_p (thread_agent, TD_CREATE, ¬ify);
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if (err != TD_OK)
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{
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warning ("Unable to get location for thread creation breakpoint: %s",
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thread_db_err_str (err));
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return;
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}
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/* Set up the breakpoint. */
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td_create_bp_addr = (CORE_ADDR) notify.u.bptaddr;
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create_thread_event_breakpoint (td_create_bp_addr);
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/* Get address for thread death breakpoint. */
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err = td_ta_event_addr_p (thread_agent, TD_DEATH, ¬ify);
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if (err != TD_OK)
|
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{
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warning ("Unable to get location for thread creation breakpoint: %s",
|
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thread_db_err_str (err));
|
||
return;
|
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}
|
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|
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/* 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. */
|
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td_event_emptyset (&events);
|
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td_ta_set_event_p (thread_agent, &events);
|
||
|
||
/* Delete thread event breakpoints, if any. */
|
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remove_thread_event_breakpoints ();
|
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td_create_bp_addr = 0;
|
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td_death_bp_addr = 0;
|
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}
|
||
|
||
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
|
||
deactivate_target (void)
|
||
{
|
||
/* Forget about the child's process ID. We shouldn't need it
|
||
anymore. */
|
||
proc_handle.pid = 0;
|
||
|
||
if (! keep_thread_db)
|
||
{
|
||
using_thread_db = 0;
|
||
unpush_target (&thread_db_ops);
|
||
}
|
||
}
|
||
|
||
static void
|
||
thread_db_new_objfile (struct objfile *objfile)
|
||
{
|
||
td_err_e err;
|
||
|
||
if (objfile == NULL)
|
||
{
|
||
/* All symbols have been discarded. If the thread_db target is
|
||
active, deactivate it now, even if the application was linked
|
||
statically against the thread library. */
|
||
keep_thread_db = 0;
|
||
if (using_thread_db)
|
||
deactivate_target ();
|
||
|
||
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_pid);
|
||
|
||
/* Now attempt to open a connection to the thread library. */
|
||
err = td_ta_new_p (&proc_handle, &thread_agent);
|
||
switch (err)
|
||
{
|
||
case TD_NOLIBTHREAD:
|
||
/* No thread library was detected. */
|
||
break;
|
||
|
||
case TD_OK:
|
||
/* The thread library was detected. Activate the thread_db target. */
|
||
push_target (&thread_db_ops);
|
||
using_thread_db = 1;
|
||
|
||
/* If the thread library was detected in the main symbol file
|
||
itself, we assume that the program was statically linked
|
||
against the thread library and well have to keep this
|
||
module's target vector activated until forever... Well, at
|
||
least until all symbols have been discarded anyway (see
|
||
above). */
|
||
if (objfile == symfile_objfile)
|
||
{
|
||
gdb_assert (proc_handle.pid == 0);
|
||
keep_thread_db = 1;
|
||
}
|
||
|
||
/* We can only poke around if there actually is a child process.
|
||
If there is no child process alive, postpone the steps below
|
||
until one has been created. */
|
||
if (proc_handle.pid != 0)
|
||
{
|
||
enable_thread_event_reporting ();
|
||
thread_db_find_new_threads ();
|
||
}
|
||
break;
|
||
|
||
default:
|
||
warning ("Cannot initialize thread debugging library: %s",
|
||
thread_db_err_str (err));
|
||
break;
|
||
}
|
||
|
||
quit:
|
||
if (target_new_objfile_chain)
|
||
target_new_objfile_chain (objfile);
|
||
}
|
||
|
||
static void
|
||
attach_thread (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 ();
|
||
deactivate_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 (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 pid;
|
||
|
||
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)
|
||
{
|
||
target_beneath->to_create_inferior (exec_file, allargs, env);
|
||
}
|
||
|
||
static void
|
||
thread_db_post_startup_inferior (int pid)
|
||
{
|
||
if (proc_handle.pid == 0)
|
||
{
|
||
/* The child process is now the actual multi-threaded
|
||
program. Snatch its process ID... */
|
||
proc_handle.pid = GET_PID (pid);
|
||
|
||
/* ...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 ();
|
||
deactivate_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_post_startup_inferior = thread_db_post_startup_inferior;
|
||
thread_db_ops.to_mourn_inferior = thread_db_mourn_inferior;
|
||
thread_db_ops.to_thread_alive = thread_db_thread_alive;
|
||
thread_db_ops.to_find_new_threads = thread_db_find_new_threads;
|
||
thread_db_ops.to_pid_to_str = thread_db_pid_to_str;
|
||
thread_db_ops.to_stratum = thread_stratum;
|
||
thread_db_ops.to_has_thread_control = tc_schedlock;
|
||
thread_db_ops.to_magic = OPS_MAGIC;
|
||
}
|
||
|
||
void
|
||
_initialize_thread_db (void)
|
||
{
|
||
/* Only initialize the module if we can load libthread_db. */
|
||
if (thread_db_load ())
|
||
{
|
||
init_thread_db_ops ();
|
||
add_target (&thread_db_ops);
|
||
|
||
/* Add ourselves to objfile event chain. */
|
||
target_new_objfile_chain = target_new_objfile_hook;
|
||
target_new_objfile_hook = thread_db_new_objfile;
|
||
}
|
||
}
|