1 /* Native debugging support for GNU/Linux (LWP layer).
3 Copyright (C) 2000-2015 Free Software Foundation, Inc.
5 This file is part of GDB.
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.
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.
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/>. */
26 /* Structure describing an LWP. This is public only for the purposes
27 of ALL_LWPS; target-specific code should generally not access it
32 /* The process id of the LWP. This is a combination of the LWP id
33 and overall process id. */
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
;
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
45 /* Non-zero if we sent this LWP a SIGSTOP (but the LWP didn't report
49 /* Non-zero if this LWP is stopped. */
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. */
60 /* The last resume GDB requested on this thread. */
61 enum resume_kind last_resume_kind
;
63 /* If non-zero, a pending wait status. */
66 /* Non-zero if we were stepping this LWP. */
69 /* STOPPED_BY_WATCHPOINT is non-zero if this LWP stopped with a data
71 int stopped_by_watchpoint
;
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
;
81 /* Non-zero if we expect a duplicated SIGINT. */
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
;
89 /* Signal wether we are in a SYSCALL_ENTRY or
90 in a SYSCALL_RETURN event.
92 - TARGET_WAITKIND_SYSCALL_ENTRY
93 - TARGET_WAITKIND_SYSCALL_RETURN */
96 /* The processor core this LWP was last seen on. */
99 /* Arch-specific additions. */
100 struct arch_lwp_info
*arch_private
;
102 /* Next LWP in list. */
103 struct lwp_info
*next
;
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
;
111 /* Iterate over each active thread (light-weight process). */
112 #define ALL_LWPS(LP) \
113 for ((LP) = lwp_list; \
117 /* Attempt to initialize libthread_db. */
118 void check_for_thread_db (void);
120 int thread_db_attach_lwp (ptid_t ptid
);
122 /* Return the set of signals used by the threads library. */
123 extern void lin_thread_get_thread_signals (sigset_t
*mask
);
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
);
129 extern int lin_lwp_attach_lwp (ptid_t ptid
);
131 extern void linux_stop_lwp (struct lwp_info
*lwp
);
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
*,
139 /* Create a prototype generic GNU/Linux target. The client can
140 override it with local methods. */
141 struct target_ops
* linux_target (void);
143 /* Create a generic GNU/Linux target using traditional
144 ptrace register access. */
146 linux_trad_target (CORE_ADDR (*register_u_offset
)(struct gdbarch
*, int, int));
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
*);
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
*));
156 /* Register a method to call whenever a new fork is attached. */
157 typedef void (linux_nat_new_fork_ftype
) (struct lwp_info
*parent
,
159 void linux_nat_set_new_fork (struct target_ops
*ops
,
160 linux_nat_new_fork_ftype
*fn
);
162 /* Register a method to call whenever a process is killed or
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
);
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
);
172 /* Register a method that converts a siginfo object between the layout
173 that ptrace returns, and the layout in the architecture of the
175 void linux_nat_set_siginfo_fixup (struct target_ops
*,
176 int (*) (siginfo_t
*,
180 /* Register a method to call prior to resuming a thread. */
182 void linux_nat_set_prepare_to_resume (struct target_ops
*,
183 void (*) (struct lwp_info
*));
185 /* Update linux-nat internal state when changing from one fork
187 void linux_nat_switch_fork (ptid_t new_ptid
);
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
);
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
));