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, 2009,
   4    2010, 2011 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 /* Ways to "resume" a thread.  */
  26
  27 enum resume_kind
  28 {
  29   /* Thread should continue.  */
  30   resume_continue,
  31
  32   /* Thread should single-step.  */
  33   resume_step,
  34
  35   /* Thread should be stopped.  */
  36   resume_stop
  37 };
  38
  39 /* Structure describing an LWP.  This is public only for the purposes
  40    of ALL_LWPS; target-specific code should generally not access it
  41    directly.  */
  42
  43 struct lwp_info
  44 {
  45   /* The process id of the LWP.  This is a combination of the LWP id
  46      and overall process id.  */
  47   ptid_t ptid;
  48
  49   /* Non-zero if this LWP is cloned.  In this context "cloned" means
  50      that the LWP is reporting to its parent using a signal other than
  51      SIGCHLD.  */
  52   int cloned;
  53
  54   /* Non-zero if we sent this LWP a SIGSTOP (but the LWP didn't report
  55      it back yet).  */
  56   int signalled;
  57
  58   /* Non-zero if this LWP is stopped.  */
  59   int stopped;
  60
  61   /* Non-zero if this LWP will be/has been resumed.  Note that an LWP
  62      can be marked both as stopped and resumed at the same time.  This
  63      happens if we try to resume an LWP that has a wait status
  64      pending.  We shouldn't let the LWP run until that wait status has
  65      been processed, but we should not report that wait status if GDB
  66      didn't try to let the LWP run.  */
  67   int resumed;
  68
  69   /* The last resume GDB requested on this thread.  */
  70   enum resume_kind last_resume_kind;
  71
  72   /* If non-zero, a pending wait status.  */
  73   int status;
  74
  75   /* Non-zero if we were stepping this LWP.  */
  76   int step;
  77
  78   /* Non-zero si_signo if this LWP stopped with a trap.  si_addr may
  79      be the address of a hardware watchpoint.  */
  80   struct siginfo siginfo;
  81
  82   /* STOPPED_BY_WATCHPOINT is non-zero if this LWP stopped with a data
  83      watchpoint trap.  */
  84   int stopped_by_watchpoint;
  85
  86   /* On architectures where it is possible to know the data address of
  87      a triggered watchpoint, STOPPED_DATA_ADDRESS_P is non-zero, and
  88      STOPPED_DATA_ADDRESS contains such data address.  Otherwise,
  89      STOPPED_DATA_ADDRESS_P is false, and STOPPED_DATA_ADDRESS is
  90      undefined.  Only valid if STOPPED_BY_WATCHPOINT is true.  */
  91   int stopped_data_address_p;
  92   CORE_ADDR stopped_data_address;
  93
  94   /* Non-zero if we expect a duplicated SIGINT.  */
  95   int ignore_sigint;
  96
  97   /* If WAITSTATUS->KIND != TARGET_WAITKIND_SPURIOUS, the waitstatus
  98      for this LWP's last event.  This may correspond to STATUS above,
  99      or to a local variable in lin_lwp_wait.  */
 100   struct target_waitstatus waitstatus;
 101
 102   /* Signal wether we are in a SYSCALL_ENTRY or
 103      in a SYSCALL_RETURN event.
 104      Values:
 105      - TARGET_WAITKIND_SYSCALL_ENTRY
 106      - TARGET_WAITKIND_SYSCALL_RETURN */
 107   int syscall_state;
 108
 109   /* The processor core this LWP was last seen on.  */
 110   int core;
 111
 112   /* Next LWP in list.  */
 113   struct lwp_info *next;
 114 };
 115
 116 /* The global list of LWPs, for ALL_LWPS.  Unlike the threads list,
 117    there is always at least one LWP on the list while the GNU/Linux
 118    native target is active.  */
 119 extern struct lwp_info *lwp_list;
 120
 121 /* Iterate over each active thread (light-weight process).  */
 122 #define ALL_LWPS(LP)                                                    \
 123   for ((LP) = lwp_list;                                                 \
 124        (LP) != NULL;                                                    \
 125        (LP) = (LP)->next)
 126
 127 #define GET_LWP(ptid)           ptid_get_lwp (ptid)
 128 #define GET_PID(ptid)           ptid_get_pid (ptid)
 129 #define is_lwp(ptid)            (GET_LWP (ptid) != 0)
 130 #define BUILD_LWP(lwp, pid)     ptid_build (pid, lwp, 0)
 131
 132 /* Attempt to initialize libthread_db.  */
 133 void check_for_thread_db (void);
 134
 135 int thread_db_attach_lwp (ptid_t ptid);
 136
 137 /* Return the set of signals used by the threads library.  */
 138 extern void lin_thread_get_thread_signals (sigset_t *mask);
 139
 140 /* Find process PID's pending signal set from /proc/pid/status.  */
 141 void linux_proc_pending_signals (int pid, sigset_t *pending,
 142                                  sigset_t *blocked, sigset_t *ignored);
 143
 144 /* linux-nat functions for handling fork events.  */
 145 extern void linux_enable_event_reporting (ptid_t ptid);
 146
 147 extern int lin_lwp_attach_lwp (ptid_t ptid);
 148
 149 /* Iterator function for lin-lwp's lwp list.  */
 150 struct lwp_info *iterate_over_lwps (ptid_t filter,
 151                                     int (*callback) (struct lwp_info *,
 152                                                      void *),
 153                                     void *data);
 154
 155 /* Create a prototype generic GNU/Linux target.  The client can
 156    override it with local methods.  */
 157 struct target_ops * linux_target (void);
 158
 159 /* Create a generic GNU/Linux target using traditional
 160    ptrace register access.  */
 161 struct target_ops *
 162 linux_trad_target (CORE_ADDR (*register_u_offset)(struct gdbarch *, int, int));
 163
 164 /* Register the customized GNU/Linux target.  This should be used
 165    instead of calling add_target directly.  */
 166 void linux_nat_add_target (struct target_ops *);
 167
 168 /* Register a method to call whenever a new thread is attached.  */
 169 void linux_nat_set_new_thread (struct target_ops *, void (*) (ptid_t));
 170
 171 /* Register a method that converts a siginfo object between the layout
 172    that ptrace returns, and the layout in the architecture of the
 173    inferior.  */
 174 void linux_nat_set_siginfo_fixup (struct target_ops *,
 175                                   int (*) (struct siginfo *,
 176                                            gdb_byte *,
 177                                            int));
 178
 179 /* Update linux-nat internal state when changing from one fork
 180    to another.  */
 181 void linux_nat_switch_fork (ptid_t new_ptid);
 182
 183 /* Return the saved siginfo associated with PTID.  */
 184 struct siginfo *linux_nat_get_siginfo (ptid_t ptid);
 185
 186 /* Compute and return the processor core of a given thread.  */
 187 int linux_nat_core_of_thread_1 (ptid_t ptid);
 188
 189 /* Set alternative SIGTRAP-like events recognizer.  */
 190 void linux_nat_set_status_is_event (struct target_ops *t,
 191                                     int (*status_is_event) (int status));