gdb/linux-nat.h

   1 /* Native debugging support for GNU/Linux (LWP layer).
   2
   3    Copyright (C) 2000-2012 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 /* Ways to "resume" a thread.  */
  27
  28 enum resume_kind
  29 {
  30   /* Thread should continue.  */
  31   resume_continue,
  32
  33   /* Thread should single-step.  */
  34   resume_step,
  35
  36   /* Thread should be stopped.  */
  37   resume_stop
  38 };
  39
  40 /* Structure describing an LWP.  This is public only for the purposes
  41    of ALL_LWPS; target-specific code should generally not access it
  42    directly.  */
  43
  44 struct lwp_info
  45 {
  46   /* The process id of the LWP.  This is a combination of the LWP id
  47      and overall process id.  */
  48   ptid_t ptid;
  49
  50   /* Non-zero if this LWP is cloned.  In this context "cloned" means
  51      that the LWP is reporting to its parent using a signal other than
  52      SIGCHLD.  */
  53   int cloned;
  54
  55   /* Non-zero if we sent this LWP a SIGSTOP (but the LWP didn't report
  56      it back yet).  */
  57   int signalled;
  58
  59   /* Non-zero if this LWP is stopped.  */
  60   int stopped;
  61
  62   /* Non-zero if this LWP will be/has been resumed.  Note that an LWP
  63      can be marked both as stopped and resumed at the same time.  This
  64      happens if we try to resume an LWP that has a wait status
  65      pending.  We shouldn't let the LWP run until that wait status has
  66      been processed, but we should not report that wait status if GDB
  67      didn't try to let the LWP run.  */
  68   int resumed;
  69
  70   /* The last resume GDB requested on this thread.  */
  71   enum resume_kind last_resume_kind;
  72
  73   /* If non-zero, a pending wait status.  */
  74   int status;
  75
  76   /* Non-zero if we were stepping this LWP.  */
  77   int step;
  78
  79   /* STOPPED_BY_WATCHPOINT is non-zero if this LWP stopped with a data
  80      watchpoint trap.  */
  81   int stopped_by_watchpoint;
  82
  83   /* On architectures where it is possible to know the data address of
  84      a triggered watchpoint, STOPPED_DATA_ADDRESS_P is non-zero, and
  85      STOPPED_DATA_ADDRESS contains such data address.  Otherwise,
  86      STOPPED_DATA_ADDRESS_P is false, and STOPPED_DATA_ADDRESS is
  87      undefined.  Only valid if STOPPED_BY_WATCHPOINT is true.  */
  88   int stopped_data_address_p;
  89   CORE_ADDR stopped_data_address;
  90
  91   /* Non-zero if we expect a duplicated SIGINT.  */
  92   int ignore_sigint;
  93
  94   /* If WAITSTATUS->KIND != TARGET_WAITKIND_SPURIOUS, the waitstatus
  95      for this LWP's last event.  This may correspond to STATUS above,
  96      or to a local variable in lin_lwp_wait.  */
  97   struct target_waitstatus waitstatus;
  98
  99   /* Signal wether we are in a SYSCALL_ENTRY or
 100      in a SYSCALL_RETURN event.
 101      Values:
 102      - TARGET_WAITKIND_SYSCALL_ENTRY
 103      - TARGET_WAITKIND_SYSCALL_RETURN */
 104   int syscall_state;
 105
 106   /* The processor core this LWP was last seen on.  */
 107   int core;
 108
 109   /* Arch-specific additions.  */
 110   struct arch_lwp_info *arch_private;
 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 extern void linux_stop_lwp (struct lwp_info *lwp);
 150
 151 /* Iterator function for lin-lwp's lwp list.  */
 152 struct lwp_info *iterate_over_lwps (ptid_t filter,
 153                                     int (*callback) (struct lwp_info *,
 154                                                      void *),
 155                                     void *data);
 156
 157 typedef int (*linux_nat_iterate_watchpoint_lwps_ftype) (struct lwp_info *lwp,
 158                                                         void *arg);
 159
 160 extern void linux_nat_iterate_watchpoint_lwps
 161   (linux_nat_iterate_watchpoint_lwps_ftype callback, void *callback_data);
 162
 163 /* Create a prototype generic GNU/Linux target.  The client can
 164    override it with local methods.  */
 165 struct target_ops * linux_target (void);
 166
 167 /* Create a generic GNU/Linux target using traditional
 168    ptrace register access.  */
 169 struct target_ops *
 170 linux_trad_target (CORE_ADDR (*register_u_offset)(struct gdbarch *, int, int));
 171
 172 /* Register the customized GNU/Linux target.  This should be used
 173    instead of calling add_target directly.  */
 174 void linux_nat_add_target (struct target_ops *);
 175
 176 /* Register a method to call whenever a new thread is attached.  */
 177 void linux_nat_set_new_thread (struct target_ops *, void (*) (struct lwp_info *));
 178
 179 /* Register a method that converts a siginfo object between the layout
 180    that ptrace returns, and the layout in the architecture of the
 181    inferior.  */
 182 void linux_nat_set_siginfo_fixup (struct target_ops *,
 183                                   int (*) (siginfo_t *,
 184                                            gdb_byte *,
 185                                            int));
 186
 187 /* Register a method to call prior to resuming a thread.  */
 188
 189 void linux_nat_set_prepare_to_resume (struct target_ops *,
 190                                       void (*) (struct lwp_info *));
 191
 192 /* Update linux-nat internal state when changing from one fork
 193    to another.  */
 194 void linux_nat_switch_fork (ptid_t new_ptid);
 195
 196 /* Store the saved siginfo associated with PTID in *SIGINFO.
 197    Return 1 if it was retrieved successfully, 0 otherwise (*SIGINFO is
 198    uninitialized in such case).  */
 199 int linux_nat_get_siginfo (ptid_t ptid, siginfo_t *siginfo);
 200
 201 /* Set alternative SIGTRAP-like events recognizer.  */
 202 void linux_nat_set_status_is_event (struct target_ops *t,
 203                                     int (*status_is_event) (int status));