gdb/linux-nat.h

   1 /* Native debugging support for GNU/Linux (LWP layer).
   2
   3    Copyright (C) 2000-2015 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   /* If this flag is set, we need to set the event request flags the
  37      next time we see this LWP stop.  */
  38   int must_set_ptrace_flags;
  39
  40   /* Non-zero if this LWP is cloned.  In this context "cloned" means
  41      that the LWP is reporting to its parent using a signal other than
  42      SIGCHLD.  */
  43   int cloned;
  44
  45   /* Non-zero if we sent this LWP a SIGSTOP (but the LWP didn't report
  46      it back yet).  */
  47   int signalled;
  48
  49   /* Non-zero if this LWP is stopped.  */
  50   int stopped;
  51
  52   /* Non-zero if this LWP will be/has been resumed.  Note that an LWP
  53      can be marked both as stopped and resumed at the same time.  This
  54      happens if we try to resume an LWP that has a wait status
  55      pending.  We shouldn't let the LWP run until that wait status has
  56      been processed, but we should not report that wait status if GDB
  57      didn't try to let the LWP run.  */
  58   int resumed;
  59
  60   /* The last resume GDB requested on this thread.  */
  61   enum resume_kind last_resume_kind;
  62
  63   /* If non-zero, a pending wait status.  */
  64   int status;
  65
  66   /* Non-zero if we were stepping this LWP.  */
  67   int step;
  68
  69   /* STOPPED_BY_WATCHPOINT is non-zero if this LWP stopped with a data
  70      watchpoint trap.  */
  71   int stopped_by_watchpoint;
  72
  73   /* On architectures where it is possible to know the data address of
  74      a triggered watchpoint, STOPPED_DATA_ADDRESS_P is non-zero, and
  75      STOPPED_DATA_ADDRESS contains such data address.  Otherwise,
  76      STOPPED_DATA_ADDRESS_P is false, and STOPPED_DATA_ADDRESS is
  77      undefined.  Only valid if STOPPED_BY_WATCHPOINT is true.  */
  78   int stopped_data_address_p;
  79   CORE_ADDR stopped_data_address;
  80
  81   /* Non-zero if we expect a duplicated SIGINT.  */
  82   int ignore_sigint;
  83
  84   /* If WAITSTATUS->KIND != TARGET_WAITKIND_SPURIOUS, the waitstatus
  85      for this LWP's last event.  This may correspond to STATUS above,
  86      or to a local variable in lin_lwp_wait.  */
  87   struct target_waitstatus waitstatus;
  88
  89   /* Signal wether we are in a SYSCALL_ENTRY or
  90      in a SYSCALL_RETURN event.
  91      Values:
  92      - TARGET_WAITKIND_SYSCALL_ENTRY
  93      - TARGET_WAITKIND_SYSCALL_RETURN */
  94   int syscall_state;
  95
  96   /* The processor core this LWP was last seen on.  */
  97   int core;
  98
  99   /* Arch-specific additions.  */
 100   struct arch_lwp_info *arch_private;
 101
 102   /* Next LWP in list.  */
 103   struct lwp_info *next;
 104 };
 105
 106 /* The global list of LWPs, for ALL_LWPS.  Unlike the threads list,
 107    there is always at least one LWP on the list while the GNU/Linux
 108    native target is active.  */
 109 extern struct lwp_info *lwp_list;
 110
 111 /* Iterate over each active thread (light-weight process).  */
 112 #define ALL_LWPS(LP)                                                    \
 113   for ((LP) = lwp_list;                                                 \
 114        (LP) != NULL;                                                    \
 115        (LP) = (LP)->next)
 116
 117 /* Attempt to initialize libthread_db.  */
 118 void check_for_thread_db (void);
 119
 120 int thread_db_attach_lwp (ptid_t ptid);
 121
 122 /* Return the set of signals used by the threads library.  */
 123 extern void lin_thread_get_thread_signals (sigset_t *mask);
 124
 125 /* Find process PID's pending signal set from /proc/pid/status.  */
 126 void linux_proc_pending_signals (int pid, sigset_t *pending,
 127                                  sigset_t *blocked, sigset_t *ignored);
 128
 129 extern int lin_lwp_attach_lwp (ptid_t ptid);
 130
 131 extern void linux_stop_lwp (struct lwp_info *lwp);
 132
 133 /* Iterator function for lin-lwp's lwp list.  */
 134 struct lwp_info *iterate_over_lwps (ptid_t filter,
 135                                     int (*callback) (struct lwp_info *,
 136                                                      void *),
 137                                     void *data);
 138
 139 /* Create a prototype generic GNU/Linux target.  The client can
 140    override it with local methods.  */
 141 struct target_ops * linux_target (void);
 142
 143 /* Create a generic GNU/Linux target using traditional
 144    ptrace register access.  */
 145 struct target_ops *
 146 linux_trad_target (CORE_ADDR (*register_u_offset)(struct gdbarch *, int, int));
 147
 148 /* Register the customized GNU/Linux target.  This should be used
 149    instead of calling add_target directly.  */
 150 void linux_nat_add_target (struct target_ops *);
 151
 152 /* Register a method to call whenever a new thread is attached.  */
 153 void linux_nat_set_new_thread (struct target_ops *, void (*) (struct lwp_info *));
 154
 155
 156 /* Register a method to call whenever a new fork is attached.  */
 157 typedef void (linux_nat_new_fork_ftype) (struct lwp_info *parent,
 158                                          pid_t child_pid);
 159 void linux_nat_set_new_fork (struct target_ops *ops,
 160                              linux_nat_new_fork_ftype *fn);
 161
 162 /* Register a method to call whenever a process is killed or
 163    detached.  */
 164 typedef void (linux_nat_forget_process_ftype) (pid_t pid);
 165 void linux_nat_set_forget_process (struct target_ops *ops,
 166                                    linux_nat_forget_process_ftype *fn);
 167
 168 /* Call the method registered with the function above.  PID is the
 169    process to forget about.  */
 170 void linux_nat_forget_process (pid_t pid);
 171
 172 /* Register a method that converts a siginfo object between the layout
 173    that ptrace returns, and the layout in the architecture of the
 174    inferior.  */
 175 void linux_nat_set_siginfo_fixup (struct target_ops *,
 176                                   int (*) (siginfo_t *,
 177                                            gdb_byte *,
 178                                            int));
 179
 180 /* Register a method to call prior to resuming a thread.  */
 181
 182 void linux_nat_set_prepare_to_resume (struct target_ops *,
 183                                       void (*) (struct lwp_info *));
 184
 185 /* Update linux-nat internal state when changing from one fork
 186    to another.  */
 187 void linux_nat_switch_fork (ptid_t new_ptid);
 188
 189 /* Store the saved siginfo associated with PTID in *SIGINFO.
 190    Return 1 if it was retrieved successfully, 0 otherwise (*SIGINFO is
 191    uninitialized in such case).  */
 192 int linux_nat_get_siginfo (ptid_t ptid, siginfo_t *siginfo);
 193
 194 /* Set alternative SIGTRAP-like events recognizer.  */
 195 void linux_nat_set_status_is_event (struct target_ops *t,
 196                                     int (*status_is_event) (int status));