gdb/linux-nat.h

   1 /* Native debugging support for GNU/Linux (LWP layer).
   2
   3    Copyright (C) 2000-2013 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 #define GET_LWP(ptid)           ptid_get_lwp (ptid)
 114 #define GET_PID(ptid)           ptid_get_pid (ptid)
 115 #define is_lwp(ptid)            (GET_LWP (ptid) != 0)
 116 #define BUILD_LWP(lwp, pid)     ptid_build (pid, lwp, 0)
 117
 118 /* Attempt to initialize libthread_db.  */
 119 void check_for_thread_db (void);
 120
 121 int thread_db_attach_lwp (ptid_t ptid);
 122
 123 /* Return the set of signals used by the threads library.  */
 124 extern void lin_thread_get_thread_signals (sigset_t *mask);
 125
 126 /* Find process PID's pending signal set from /proc/pid/status.  */
 127 void linux_proc_pending_signals (int pid, sigset_t *pending,
 128                                  sigset_t *blocked, sigset_t *ignored);
 129
 130 extern int lin_lwp_attach_lwp (ptid_t ptid);
 131
 132 extern void linux_stop_lwp (struct lwp_info *lwp);
 133
 134 /* Iterator function for lin-lwp's lwp list.  */
 135 struct lwp_info *iterate_over_lwps (ptid_t filter,
 136                                     int (*callback) (struct lwp_info *,
 137                                                      void *),
 138                                     void *data);
 139
 140 /* Create a prototype generic GNU/Linux target.  The client can
 141    override it with local methods.  */
 142 struct target_ops * linux_target (void);
 143
 144 /* Create a generic GNU/Linux target using traditional
 145    ptrace register access.  */
 146 struct target_ops *
 147 linux_trad_target (CORE_ADDR (*register_u_offset)(struct gdbarch *, int, int));
 148
 149 /* Register the customized GNU/Linux target.  This should be used
 150    instead of calling add_target directly.  */
 151 void linux_nat_add_target (struct target_ops *);
 152
 153 /* Register a method to call whenever a new thread is attached.  */
 154 void linux_nat_set_new_thread (struct target_ops *, void (*) (struct lwp_info *));
 155
 156
 157 /* Register a method to call whenever a new fork is attached.  */
 158 typedef void (linux_nat_new_fork_ftype) (struct lwp_info *parent,
 159                                          pid_t child_pid);
 160 void linux_nat_set_new_fork (struct target_ops *ops,
 161                              linux_nat_new_fork_ftype *fn);
 162
 163 /* Register a method to call whenever a process is killed or
 164    detached.  */
 165 typedef void (linux_nat_forget_process_ftype) (pid_t pid);
 166 void linux_nat_set_forget_process (struct target_ops *ops,
 167                                    linux_nat_forget_process_ftype *fn);
 168
 169 /* Call the method registered with the function above.  PID is the
 170    process to forget about.  */
 171 void linux_nat_forget_process (pid_t pid);
 172
 173 /* Register a method that converts a siginfo object between the layout
 174    that ptrace returns, and the layout in the architecture of the
 175    inferior.  */
 176 void linux_nat_set_siginfo_fixup (struct target_ops *,
 177                                   int (*) (siginfo_t *,
 178                                            gdb_byte *,
 179                                            int));
 180
 181 /* Register a method to call prior to resuming a thread.  */
 182
 183 void linux_nat_set_prepare_to_resume (struct target_ops *,
 184                                       void (*) (struct lwp_info *));
 185
 186 /* Update linux-nat internal state when changing from one fork
 187    to another.  */
 188 void linux_nat_switch_fork (ptid_t new_ptid);
 189
 190 /* Store the saved siginfo associated with PTID in *SIGINFO.
 191    Return 1 if it was retrieved successfully, 0 otherwise (*SIGINFO is
 192    uninitialized in such case).  */
 193 int linux_nat_get_siginfo (ptid_t ptid, siginfo_t *siginfo);
 194
 195 /* Set alternative SIGTRAP-like events recognizer.  */
 196 void linux_nat_set_status_is_event (struct target_ops *t,
 197                                     int (*status_is_event) (int status));