gdb/linux-nat.h

   1 /* Native debugging support for GNU/Linux (LWP layer).
   2
   3    Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
   4    Free Software Foundation, Inc.
   5
   6    This file is part of GDB.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  20
  21 #include "target.h"
  22
  23 #include <signal.h>
  24
  25 /* Structure describing an LWP.  This is public only for the purposes
  26    of ALL_LWPS; target-specific code should generally not access it
  27    directly.  */
  28
  29 struct lwp_info
  30 {
  31   /* The process id of the LWP.  This is a combination of the LWP id
  32      and overall process id.  */
  33   ptid_t ptid;
  34
  35   /* Non-zero if this LWP is cloned.  In this context "cloned" means
  36      that the LWP is reporting to its parent using a signal other than
  37      SIGCHLD.  */
  38   int cloned;
  39
  40   /* Non-zero if we sent this LWP a SIGSTOP (but the LWP didn't report
  41      it back yet).  */
  42   int signalled;
  43
  44   /* Non-zero if this LWP is stopped.  */
  45   int stopped;
  46
  47   /* Non-zero if this LWP will be/has been resumed.  Note that an LWP
  48      can be marked both as stopped and resumed at the same time.  This
  49      happens if we try to resume an LWP that has a wait status
  50      pending.  We shouldn't let the LWP run until that wait status has
  51      been processed, but we should not report that wait status if GDB
  52      didn't try to let the LWP run.  */
  53   int resumed;
  54
  55   /* If non-zero, a pending wait status.  */
  56   int status;
  57
  58   /* Non-zero if we were stepping this LWP.  */
  59   int step;
  60
  61   /* Non-zero si_signo if this LWP stopped with a trap.  si_addr may
  62      be the address of a hardware watchpoint.  */
  63   struct siginfo siginfo;
  64
  65   /* Non-zero if we expect a duplicated SIGINT.  */
  66   int ignore_sigint;
  67
  68   /* If WAITSTATUS->KIND != TARGET_WAITKIND_SPURIOUS, the waitstatus
  69      for this LWP's last event.  This may correspond to STATUS above,
  70      or to a local variable in lin_lwp_wait.  */
  71   struct target_waitstatus waitstatus;
  72
  73   /* Next LWP in list.  */
  74   struct lwp_info *next;
  75 };
  76
  77 /* The global list of LWPs, for ALL_LWPS.  Unlike the threads list,
  78    there is always at least one LWP on the list while the GNU/Linux
  79    native target is active.  */
  80 extern struct lwp_info *lwp_list;
  81
  82 /* Iterate over the PTID each active thread (light-weight process).  There
  83    must be at least one.  */
  84 #define ALL_LWPS(LP, PTID)                                              \
  85   for ((LP) = lwp_list, (PTID) = (LP)->ptid;                            \
  86        (LP) != NULL;                                                    \
  87        (LP) = (LP)->next, (PTID) = (LP) ? (LP)->ptid : (PTID))
  88
  89 #define GET_LWP(ptid)           ptid_get_lwp (ptid)
  90 #define GET_PID(ptid)           ptid_get_pid (ptid)
  91 #define is_lwp(ptid)            (GET_LWP (ptid) != 0)
  92 #define BUILD_LWP(lwp, pid)     ptid_build (pid, lwp, 0)
  93
  94 /* Attempt to initialize libthread_db.  */
  95 void check_for_thread_db (void);
  96
  97 /* Tell the thread_db layer what native target operations to use.  */
  98 void thread_db_init (struct target_ops *);
  99
 100 int thread_db_attach_lwp (ptid_t ptid);
 101
 102 /* Find process PID's pending signal set from /proc/pid/status.  */
 103 void linux_proc_pending_signals (int pid, sigset_t *pending, sigset_t *blocked, sigset_t *ignored);
 104
 105 /* linux-nat functions for handling fork events.  */
 106 extern void linux_enable_event_reporting (ptid_t ptid);
 107
 108 extern int lin_lwp_attach_lwp (ptid_t ptid);
 109
 110 /* Iterator function for lin-lwp's lwp list.  */
 111 struct lwp_info *iterate_over_lwps (int (*callback) (struct lwp_info *,
 112                                                      void *),
 113                                     void *data);
 114
 115 /* Create a prototype generic GNU/Linux target.  The client can
 116    override it with local methods.  */
 117 struct target_ops * linux_target (void);
 118
 119 /* Create a generic GNU/Linux target using traditional
 120    ptrace register access.  */
 121 struct target_ops *
 122 linux_trad_target (CORE_ADDR (*register_u_offset)(struct gdbarch *, int, int));
 123
 124 /* Register the customized GNU/Linux target.  This should be used
 125    instead of calling add_target directly.  */
 126 void linux_nat_add_target (struct target_ops *);
 127
 128 /* Register a method to call whenever a new thread is attached.  */
 129 void linux_nat_set_new_thread (struct target_ops *, void (*) (ptid_t));
 130
 131 /* Update linux-nat internal state when changing from one fork
 132    to another.  */
 133 void linux_nat_switch_fork (ptid_t new_ptid);
 134
 135 /* Return the saved siginfo associated with PTID.  */
 136 struct siginfo *linux_nat_get_siginfo (ptid_t ptid);