gdb/linux-nat.h

   1 /* Native debugging support for GNU/Linux (LWP layer).
   2
   3    Copyright (C) 2000-2014 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include "target.h"
  21
  22 #include <signal.h>
  23
  24 struct arch_lwp_info;
  25
  26 /* Structure describing an LWP.  This is public only for the purposes
  27    of ALL_LWPS; target-specific code should generally not access it
  28    directly.  */
  29
  30 struct lwp_info
  31 {
  32   /* The process id of the LWP.  This is a combination of the LWP id
  33      and overall process id.  */
  34   ptid_t ptid;
  35
  36   /* Non-zero if this LWP is cloned.  In this context "cloned" means
  37      that the LWP is reporting to its parent using a signal other than
  38      SIGCHLD.  */
  39   int cloned;
  40
  41   /* Non-zero if we sent this LWP a SIGSTOP (but the LWP didn't report
  42      it back yet).  */
  43   int signalled;
  44
  45   /* Non-zero if this LWP is stopped.  */
  46   int stopped;
  47
  48   /* Non-zero if this LWP will be/has been resumed.  Note that an LWP
  49      can be marked both as stopped and resumed at the same time.  This
  50      happens if we try to resume an LWP that has a wait status
  51      pending.  We shouldn't let the LWP run until that wait status has
  52      been processed, but we should not report that wait status if GDB
  53      didn't try to let the LWP run.  */
  54   int resumed;
  55
  56   /* The last resume GDB requested on this thread.  */
  57   enum resume_kind last_resume_kind;
  58
  59   /* If non-zero, a pending wait status.  */
  60   int status;
  61
  62   /* Non-zero if we were stepping this LWP.  */
  63   int step;
  64
  65   /* STOPPED_BY_WATCHPOINT is non-zero if this LWP stopped with a data
  66      watchpoint trap.  */
  67   int stopped_by_watchpoint;
  68
  69   /* On architectures where it is possible to know the data address of
  70      a triggered watchpoint, STOPPED_DATA_ADDRESS_P is non-zero, and
  71      STOPPED_DATA_ADDRESS contains such data address.  Otherwise,
  72      STOPPED_DATA_ADDRESS_P is false, and STOPPED_DATA_ADDRESS is
  73      undefined.  Only valid if STOPPED_BY_WATCHPOINT is true.  */
  74   int stopped_data_address_p;
  75   CORE_ADDR stopped_data_address;
  76
  77   /* Non-zero if we expect a duplicated SIGINT.  */
  78   int ignore_sigint;
  79
  80   /* If WAITSTATUS->KIND != TARGET_WAITKIND_SPURIOUS, the waitstatus
  81      for this LWP's last event.  This may correspond to STATUS above,
  82      or to a local variable in lin_lwp_wait.  */
  83   struct target_waitstatus waitstatus;
  84
  85   /* Signal wether we are in a SYSCALL_ENTRY or
  86      in a SYSCALL_RETURN event.
  87      Values:
  88      - TARGET_WAITKIND_SYSCALL_ENTRY
  89      - TARGET_WAITKIND_SYSCALL_RETURN */
  90   int syscall_state;
  91
  92   /* The processor core this LWP was last seen on.  */
  93   int core;
  94
  95   /* Arch-specific additions.  */
  96   struct arch_lwp_info *arch_private;
  97
  98   /* Next LWP in list.  */
  99   struct lwp_info *next;
 100 };
 101
 102 /* The global list of LWPs, for ALL_LWPS.  Unlike the threads list,
 103    there is always at least one LWP on the list while the GNU/Linux
 104    native target is active.  */
 105 extern struct lwp_info *lwp_list;
 106
 107 /* Iterate over each active thread (light-weight process).  */
 108 #define ALL_LWPS(LP)                                                    \
 109   for ((LP) = lwp_list;                                                 \
 110        (LP) != NULL;                                                    \
 111        (LP) = (LP)->next)
 112
 113 /* Attempt to initialize libthread_db.  */
 114 void check_for_thread_db (void);
 115
 116 int thread_db_attach_lwp (ptid_t ptid);
 117
 118 /* Return the set of signals used by the threads library.  */
 119 extern void lin_thread_get_thread_signals (sigset_t *mask);
 120
 121 /* Find process PID's pending signal set from /proc/pid/status.  */
 122 void linux_proc_pending_signals (int pid, sigset_t *pending,
 123                                  sigset_t *blocked, sigset_t *ignored);
 124
 125 extern int lin_lwp_attach_lwp (ptid_t ptid);
 126
 127 extern void linux_stop_lwp (struct lwp_info *lwp);
 128
 129 /* Iterator function for lin-lwp's lwp list.  */
 130 struct lwp_info *iterate_over_lwps (ptid_t filter,
 131                                     int (*callback) (struct lwp_info *,
 132                                                      void *),
 133                                     void *data);
 134
 135 /* Create a prototype generic GNU/Linux target.  The client can
 136    override it with local methods.  */
 137 struct target_ops * linux_target (void);
 138
 139 /* Create a generic GNU/Linux target using traditional
 140    ptrace register access.  */
 141 struct target_ops *
 142 linux_trad_target (CORE_ADDR (*register_u_offset)(struct gdbarch *, int, int));
 143
 144 /* Register the customized GNU/Linux target.  This should be used
 145    instead of calling add_target directly.  */
 146 void linux_nat_add_target (struct target_ops *);
 147
 148 /* Register a method to call whenever a new thread is attached.  */
 149 void linux_nat_set_new_thread (struct target_ops *, void (*) (struct lwp_info *));
 150
 151
 152 /* Register a method to call whenever a new fork is attached.  */
 153 typedef void (linux_nat_new_fork_ftype) (struct lwp_info *parent,
 154                                          pid_t child_pid);
 155 void linux_nat_set_new_fork (struct target_ops *ops,
 156                              linux_nat_new_fork_ftype *fn);
 157
 158 /* Register a method to call whenever a process is killed or
 159    detached.  */
 160 typedef void (linux_nat_forget_process_ftype) (pid_t pid);
 161 void linux_nat_set_forget_process (struct target_ops *ops,
 162                                    linux_nat_forget_process_ftype *fn);
 163
 164 /* Call the method registered with the function above.  PID is the
 165    process to forget about.  */
 166 void linux_nat_forget_process (pid_t pid);
 167
 168 /* Register a method that converts a siginfo object between the layout
 169    that ptrace returns, and the layout in the architecture of the
 170    inferior.  */
 171 void linux_nat_set_siginfo_fixup (struct target_ops *,
 172                                   int (*) (siginfo_t *,
 173                                            gdb_byte *,
 174                                            int));
 175
 176 /* Register a method to call prior to resuming a thread.  */
 177
 178 void linux_nat_set_prepare_to_resume (struct target_ops *,
 179                                       void (*) (struct lwp_info *));
 180
 181 /* Update linux-nat internal state when changing from one fork
 182    to another.  */
 183 void linux_nat_switch_fork (ptid_t new_ptid);
 184
 185 /* Store the saved siginfo associated with PTID in *SIGINFO.
 186    Return 1 if it was retrieved successfully, 0 otherwise (*SIGINFO is
 187    uninitialized in such case).  */
 188 int linux_nat_get_siginfo (ptid_t ptid, siginfo_t *siginfo);
 189
 190 /* Set alternative SIGTRAP-like events recognizer.  */
 191 void linux_nat_set_status_is_event (struct target_ops *t,
 192                                     int (*status_is_event) (int status));