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 /* Structure describing an LWP.  This is public only for the purposes
  26    of ALL_LWPS; target-specific code should generally not access it
  27    directly.  */
  28
  29 struct lwp_info
  30 {
  31   /* The process id of the LWP.  This is a combination of the LWP id
  32      and overall process id.  */
  33   ptid_t ptid;
  34
  35   /* Non-zero if this LWP is cloned.  In this context "cloned" means
  36      that the LWP is reporting to its parent using a signal other than
  37      SIGCHLD.  */
  38   int cloned;
  39
  40   /* Non-zero if we sent this LWP a SIGSTOP (but the LWP didn't report
  41      it back yet).  */
  42   int signalled;
  43
  44   /* Non-zero if this LWP is stopped.  */
  45   int stopped;
  46
  47   /* Non-zero if this LWP will be/has been resumed.  Note that an LWP
  48      can be marked both as stopped and resumed at the same time.  This
  49      happens if we try to resume an LWP that has a wait status
  50      pending.  We shouldn't let the LWP run until that wait status has
  51      been processed, but we should not report that wait status if GDB
  52      didn't try to let the LWP run.  */
  53   int resumed;
  54
  55   /* If non-zero, a pending wait status.  */
  56   int status;
  57
  58   /* Non-zero if we were stepping this LWP.  */
  59   int step;
  60
  61   /* Non-zero si_signo if this LWP stopped with a trap.  si_addr may
  62      be the address of a hardware watchpoint.  */
  63   struct siginfo siginfo;
  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   /* Next LWP in list.  */
  96   struct lwp_info *next;
  97 };
  98
  99 /* The global list of LWPs, for ALL_LWPS.  Unlike the threads list,
 100    there is always at least one LWP on the list while the GNU/Linux
 101    native target is active.  */
 102 extern struct lwp_info *lwp_list;
 103
 104 /* Iterate over the PTID each active thread (light-weight process).  There
 105    must be at least one.  */
 106 #define ALL_LWPS(LP, PTID)                                              \
 107   for ((LP) = lwp_list, (PTID) = (LP)->ptid;                            \
 108        (LP) != NULL;                                                    \
 109        (LP) = (LP)->next, (PTID) = (LP) ? (LP)->ptid : (PTID))
 110
 111 #define GET_LWP(ptid)           ptid_get_lwp (ptid)
 112 #define GET_PID(ptid)           ptid_get_pid (ptid)
 113 #define is_lwp(ptid)            (GET_LWP (ptid) != 0)
 114 #define BUILD_LWP(lwp, pid)     ptid_build (pid, lwp, 0)
 115
 116 /* Attempt to initialize libthread_db.  */
 117 void check_for_thread_db (void);
 118
 119 int thread_db_attach_lwp (ptid_t ptid);
 120
 121 /* Return the set of signals used by the threads library.  */
 122 extern void lin_thread_get_thread_signals (sigset_t *mask);
 123
 124 /* Find process PID's pending signal set from /proc/pid/status.  */
 125 void linux_proc_pending_signals (int pid, sigset_t *pending,
 126                                  sigset_t *blocked, sigset_t *ignored);
 127
 128 /* Return the TGID of LWPID from /proc/pid/status.  Returns -1 if not
 129    found.  */
 130 extern int linux_proc_get_tgid (int lwpid);
 131
 132 /* linux-nat functions for handling fork events.  */
 133 extern void linux_enable_event_reporting (ptid_t ptid);
 134
 135 extern int lin_lwp_attach_lwp (ptid_t ptid);
 136
 137 /* Iterator function for lin-lwp's lwp list.  */
 138 struct lwp_info *iterate_over_lwps (ptid_t filter,
 139                                     int (*callback) (struct lwp_info *,
 140                                                      void *),
 141                                     void *data);
 142
 143 /* Create a prototype generic GNU/Linux target.  The client can
 144    override it with local methods.  */
 145 struct target_ops * linux_target (void);
 146
 147 /* Create a generic GNU/Linux target using traditional
 148    ptrace register access.  */
 149 struct target_ops *
 150 linux_trad_target (CORE_ADDR (*register_u_offset)(struct gdbarch *, int, int));
 151
 152 /* Register the customized GNU/Linux target.  This should be used
 153    instead of calling add_target directly.  */
 154 void linux_nat_add_target (struct target_ops *);
 155
 156 /* Register a method to call whenever a new thread is attached.  */
 157 void linux_nat_set_new_thread (struct target_ops *, void (*) (ptid_t));
 158
 159 /* Register a method that converts a siginfo object between the layout
 160    that ptrace returns, and the layout in the architecture of the
 161    inferior.  */
 162 void linux_nat_set_siginfo_fixup (struct target_ops *,
 163                                   int (*) (struct siginfo *,
 164                                            gdb_byte *,
 165                                            int));
 166
 167 /* Update linux-nat internal state when changing from one fork
 168    to another.  */
 169 void linux_nat_switch_fork (ptid_t new_ptid);
 170
 171 /* Return the saved siginfo associated with PTID.  */
 172 struct siginfo *linux_nat_get_siginfo (ptid_t ptid);
 173
 174 /* Compute and return the processor core of a given thread.  */
 175 int linux_nat_core_of_thread_1 (ptid_t ptid);
 176
 177 /* Set alternative SIGTRAP-like events recognizer.  */
 178 void linux_nat_set_status_is_event (struct target_ops *t,
 179                                     int (*status_is_event) (int status));