1 /* Native debugging support for GNU/Linux (LWP layer).
3 Copyright (C) 2000-2014 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 /* Non-zero if this LWP is cloned. In this context "cloned" means
37 that the LWP is reporting to its parent using a signal other than
41 /* Non-zero if we sent this LWP a SIGSTOP (but the LWP didn't report
45 /* Non-zero if this LWP is stopped. */
48 /* Non-zero if this LWP will be/has been resumed. Note that an LWP
49 can be marked both as stopped and resumed at the same time. This
50 happens if we try to resume an LWP that has a wait status
51 pending. We shouldn't let the LWP run until that wait status has
52 been processed, but we should not report that wait status if GDB
53 didn't try to let the LWP run. */
56 /* The last resume GDB requested on this thread. */
57 enum resume_kind last_resume_kind;
59 /* If non-zero, a pending wait status. */
62 /* Non-zero if we were stepping this LWP. */
65 /* STOPPED_BY_WATCHPOINT is non-zero if this LWP stopped with a data
67 int stopped_by_watchpoint;
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;
77 /* Non-zero if we expect a duplicated SIGINT. */
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;
85 /* Signal wether we are in a SYSCALL_ENTRY or
86 in a SYSCALL_RETURN event.
88 - TARGET_WAITKIND_SYSCALL_ENTRY
89 - TARGET_WAITKIND_SYSCALL_RETURN */
92 /* The processor core this LWP was last seen on. */
95 /* Arch-specific additions. */
96 struct arch_lwp_info *arch_private;
98 /* Next LWP in list. */
99 struct lwp_info *next;
102 /* The global list of LWPs, for ALL_LWPS. Unlike the threads list,
103 there is always at least one LWP on the list while the GNU/Linux
104 native target is active. */
105 extern struct lwp_info *lwp_list;
107 /* Iterate over each active thread (light-weight process). */
108 #define ALL_LWPS(LP) \
109 for ((LP) = lwp_list; \
113 /* Attempt to initialize libthread_db. */
114 void check_for_thread_db (void);
116 int thread_db_attach_lwp (ptid_t ptid);
118 /* Return the set of signals used by the threads library. */
119 extern void lin_thread_get_thread_signals (sigset_t *mask);
121 /* Find process PID's pending signal set from /proc/pid/status. */
122 void linux_proc_pending_signals (int pid, sigset_t *pending,
123 sigset_t *blocked, sigset_t *ignored);
125 extern int lin_lwp_attach_lwp (ptid_t ptid);
127 extern void linux_stop_lwp (struct lwp_info *lwp);
129 /* Iterator function for lin-lwp's lwp list. */
130 struct lwp_info *iterate_over_lwps (ptid_t filter,
131 int (*callback) (struct lwp_info *,
135 /* Create a prototype generic GNU/Linux target. The client can
136 override it with local methods. */
137 struct target_ops * linux_target (void);
139 /* Create a generic GNU/Linux target using traditional
140 ptrace register access. */
142 linux_trad_target (CORE_ADDR (*register_u_offset)(struct gdbarch *, int, int));
144 /* Register the customized GNU/Linux target. This should be used
145 instead of calling add_target directly. */
146 void linux_nat_add_target (struct target_ops *);
148 /* Register a method to call whenever a new thread is attached. */
149 void linux_nat_set_new_thread (struct target_ops *, void (*) (struct lwp_info *));
152 /* Register a method to call whenever a new fork is attached. */
153 typedef void (linux_nat_new_fork_ftype) (struct lwp_info *parent,
155 void linux_nat_set_new_fork (struct target_ops *ops,
156 linux_nat_new_fork_ftype *fn);
158 /* Register a method to call whenever a process is killed or
160 typedef void (linux_nat_forget_process_ftype) (pid_t pid);
161 void linux_nat_set_forget_process (struct target_ops *ops,
162 linux_nat_forget_process_ftype *fn);
164 /* Call the method registered with the function above. PID is the
165 process to forget about. */
166 void linux_nat_forget_process (pid_t pid);
168 /* Register a method that converts a siginfo object between the layout
169 that ptrace returns, and the layout in the architecture of the
171 void linux_nat_set_siginfo_fixup (struct target_ops *,
172 int (*) (siginfo_t *,
176 /* Register a method to call prior to resuming a thread. */
178 void linux_nat_set_prepare_to_resume (struct target_ops *,
179 void (*) (struct lwp_info *));
181 /* Update linux-nat internal state when changing from one fork
183 void linux_nat_switch_fork (ptid_t new_ptid);
185 /* Store the saved siginfo associated with PTID in *SIGINFO.
186 Return 1 if it was retrieved successfully, 0 otherwise (*SIGINFO is
187 uninitialized in such case). */
188 int linux_nat_get_siginfo (ptid_t ptid, siginfo_t *siginfo);
190 /* Set alternative SIGTRAP-like events recognizer. */
191 void linux_nat_set_status_is_event (struct target_ops *t,
192 int (*status_is_event) (int status));