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 struct arch_lwp_info;
  26
  27 /* Ways to "resume" a thread.  */
  28
  29 enum resume_kind
  30 {
  31   /* Thread should continue.  */
  32   resume_continue,
  33
  34   /* Thread should single-step.  */
  35   resume_step,
  36
  37   /* Thread should be stopped.  */
  38   resume_stop
  39 };
  40
  41 /* Structure describing an LWP.  This is public only for the purposes
  42    of ALL_LWPS; target-specific code should generally not access it
  43    directly.  */
  44
  45 struct lwp_info
  46 {
  47   /* The process id of the LWP.  This is a combination of the LWP id
  48      and overall process id.  */
  49   ptid_t ptid;
  50
  51   /* Non-zero if this LWP is cloned.  In this context "cloned" means
  52      that the LWP is reporting to its parent using a signal other than
  53      SIGCHLD.  */
  54   int cloned;
  55
  56   /* Non-zero if we sent this LWP a SIGSTOP (but the LWP didn't report
  57      it back yet).  */
  58   int signalled;
  59
  60   /* Non-zero if this LWP is stopped.  */
  61   int stopped;
  62
  63   /* Non-zero if this LWP will be/has been resumed.  Note that an LWP
  64      can be marked both as stopped and resumed at the same time.  This
  65      happens if we try to resume an LWP that has a wait status
  66      pending.  We shouldn't let the LWP run until that wait status has
  67      been processed, but we should not report that wait status if GDB
  68      didn't try to let the LWP run.  */
  69   int resumed;
  70
  71   /* The last resume GDB requested on this thread.  */
  72   enum resume_kind last_resume_kind;
  73
  74   /* If non-zero, a pending wait status.  */
  75   int status;
  76
  77   /* Non-zero if we were stepping this LWP.  */
  78   int step;
  79
  80   /* Non-zero si_signo if this LWP stopped with a trap.  si_addr may
  81      be the address of a hardware watchpoint.  */
  82   struct siginfo siginfo;
  83
  84   /* STOPPED_BY_WATCHPOINT is non-zero if this LWP stopped with a data
  85      watchpoint trap.  */
  86   int stopped_by_watchpoint;
  87
  88   /* On architectures where it is possible to know the data address of
  89      a triggered watchpoint, STOPPED_DATA_ADDRESS_P is non-zero, and
  90      STOPPED_DATA_ADDRESS contains such data address.  Otherwise,
  91      STOPPED_DATA_ADDRESS_P is false, and STOPPED_DATA_ADDRESS is
  92      undefined.  Only valid if STOPPED_BY_WATCHPOINT is true.  */
  93   int stopped_data_address_p;
  94   CORE_ADDR stopped_data_address;
  95
  96   /* Non-zero if we expect a duplicated SIGINT.  */
  97   int ignore_sigint;
  98
  99   /* If WAITSTATUS->KIND != TARGET_WAITKIND_SPURIOUS, the waitstatus
 100      for this LWP's last event.  This may correspond to STATUS above,
 101      or to a local variable in lin_lwp_wait.  */
 102   struct target_waitstatus waitstatus;
 103
 104   /* Signal wether we are in a SYSCALL_ENTRY or
 105      in a SYSCALL_RETURN event.
 106      Values:
 107      - TARGET_WAITKIND_SYSCALL_ENTRY
 108      - TARGET_WAITKIND_SYSCALL_RETURN */
 109   int syscall_state;
 110
 111   /* The processor core this LWP was last seen on.  */
 112   int core;
 113
 114   /* Arch-specific additions.  */
 115   struct arch_lwp_info *arch_private;
 116
 117   /* Next LWP in list.  */
 118   struct lwp_info *next;
 119 };
 120
 121 /* The global list of LWPs, for ALL_LWPS.  Unlike the threads list,
 122    there is always at least one LWP on the list while the GNU/Linux
 123    native target is active.  */
 124 extern struct lwp_info *lwp_list;
 125
 126 /* Iterate over each active thread (light-weight process).  */
 127 #define ALL_LWPS(LP)                                                    \
 128   for ((LP) = lwp_list;                                                 \
 129        (LP) != NULL;                                                    \
 130        (LP) = (LP)->next)
 131
 132 #define GET_LWP(ptid)           ptid_get_lwp (ptid)
 133 #define GET_PID(ptid)           ptid_get_pid (ptid)
 134 #define is_lwp(ptid)            (GET_LWP (ptid) != 0)
 135 #define BUILD_LWP(lwp, pid)     ptid_build (pid, lwp, 0)
 136
 137 /* Attempt to initialize libthread_db.  */
 138 void check_for_thread_db (void);
 139
 140 int thread_db_attach_lwp (ptid_t ptid);
 141
 142 /* Return the set of signals used by the threads library.  */
 143 extern void lin_thread_get_thread_signals (sigset_t *mask);
 144
 145 /* Find process PID's pending signal set from /proc/pid/status.  */
 146 void linux_proc_pending_signals (int pid, sigset_t *pending,
 147                                  sigset_t *blocked, sigset_t *ignored);
 148
 149 /* linux-nat functions for handling fork events.  */
 150 extern void linux_enable_event_reporting (ptid_t ptid);
 151
 152 extern int lin_lwp_attach_lwp (ptid_t ptid);
 153
 154 extern void linux_stop_lwp (struct lwp_info *lwp);
 155
 156 /* Iterator function for lin-lwp's lwp list.  */
 157 struct lwp_info *iterate_over_lwps (ptid_t filter,
 158                                     int (*callback) (struct lwp_info *,
 159                                                      void *),
 160                                     void *data);
 161
 162 /* Create a prototype generic GNU/Linux target.  The client can
 163    override it with local methods.  */
 164 struct target_ops * linux_target (void);
 165
 166 /* Create a generic GNU/Linux target using traditional
 167    ptrace register access.  */
 168 struct target_ops *
 169 linux_trad_target (CORE_ADDR (*register_u_offset)(struct gdbarch *, int, int));
 170
 171 /* Register the customized GNU/Linux target.  This should be used
 172    instead of calling add_target directly.  */
 173 void linux_nat_add_target (struct target_ops *);
 174
 175 /* Register a method to call whenever a new thread is attached.  */
 176 void linux_nat_set_new_thread (struct target_ops *, void (*) (struct lwp_info *));
 177
 178 /* Register a method that converts a siginfo object between the layout
 179    that ptrace returns, and the layout in the architecture of the
 180    inferior.  */
 181 void linux_nat_set_siginfo_fixup (struct target_ops *,
 182                                   int (*) (struct siginfo *,
 183                                            gdb_byte *,
 184                                            int));
 185
 186 /* Register a method to call prior to resuming a thread.  */
 187
 188 void linux_nat_set_prepare_to_resume (struct target_ops *,
 189                                       void (*) (struct lwp_info *));
 190
 191 /* Update linux-nat internal state when changing from one fork
 192    to another.  */
 193 void linux_nat_switch_fork (ptid_t new_ptid);
 194
 195 /* Return the saved siginfo associated with PTID.  */
 196 struct siginfo *linux_nat_get_siginfo (ptid_t ptid);
 197
 198 /* Compute and return the processor core of a given thread.  */
 199 int linux_nat_core_of_thread_1 (ptid_t ptid);
 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));