1 /* Native debugging support for GNU/Linux (LWP layer).
3 Copyright (C) 2000-2012 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 /* Ways to "resume" a thread. */
30 /* Thread should continue. */
33 /* Thread should single-step. */
36 /* Thread should be stopped. */
40 /* Structure describing an LWP. This is public only for the purposes
41 of ALL_LWPS; target-specific code should generally not access it
46 /* The process id of the LWP. This is a combination of the LWP id
47 and overall process id. */
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
55 /* Non-zero if we sent this LWP a SIGSTOP (but the LWP didn't report
59 /* Non-zero if this LWP is stopped. */
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. */
70 /* The last resume GDB requested on this thread. */
71 enum resume_kind last_resume_kind;
73 /* If non-zero, a pending wait status. */
76 /* Non-zero if we were stepping this LWP. */
79 /* Non-zero si_signo if this LWP stopped with a trap. si_addr may
80 be the address of a hardware watchpoint. */
83 /* STOPPED_BY_WATCHPOINT is non-zero if this LWP stopped with a data
85 int stopped_by_watchpoint;
87 /* On architectures where it is possible to know the data address of
88 a triggered watchpoint, STOPPED_DATA_ADDRESS_P is non-zero, and
89 STOPPED_DATA_ADDRESS contains such data address. Otherwise,
90 STOPPED_DATA_ADDRESS_P is false, and STOPPED_DATA_ADDRESS is
91 undefined. Only valid if STOPPED_BY_WATCHPOINT is true. */
92 int stopped_data_address_p;
93 CORE_ADDR stopped_data_address;
95 /* Non-zero if we expect a duplicated SIGINT. */
98 /* If WAITSTATUS->KIND != TARGET_WAITKIND_SPURIOUS, the waitstatus
99 for this LWP's last event. This may correspond to STATUS above,
100 or to a local variable in lin_lwp_wait. */
101 struct target_waitstatus waitstatus;
103 /* Signal wether we are in a SYSCALL_ENTRY or
104 in a SYSCALL_RETURN event.
106 - TARGET_WAITKIND_SYSCALL_ENTRY
107 - TARGET_WAITKIND_SYSCALL_RETURN */
110 /* The processor core this LWP was last seen on. */
113 /* Arch-specific additions. */
114 struct arch_lwp_info *arch_private;
116 /* Next LWP in list. */
117 struct lwp_info *next;
120 /* The global list of LWPs, for ALL_LWPS. Unlike the threads list,
121 there is always at least one LWP on the list while the GNU/Linux
122 native target is active. */
123 extern struct lwp_info *lwp_list;
125 /* Iterate over each active thread (light-weight process). */
126 #define ALL_LWPS(LP) \
127 for ((LP) = lwp_list; \
131 #define GET_LWP(ptid) ptid_get_lwp (ptid)
132 #define GET_PID(ptid) ptid_get_pid (ptid)
133 #define is_lwp(ptid) (GET_LWP (ptid) != 0)
134 #define BUILD_LWP(lwp, pid) ptid_build (pid, lwp, 0)
136 /* Attempt to initialize libthread_db. */
137 void check_for_thread_db (void);
139 int thread_db_attach_lwp (ptid_t ptid);
141 /* Return the set of signals used by the threads library. */
142 extern void lin_thread_get_thread_signals (sigset_t *mask);
144 /* Find process PID's pending signal set from /proc/pid/status. */
145 void linux_proc_pending_signals (int pid, sigset_t *pending,
146 sigset_t *blocked, sigset_t *ignored);
148 /* linux-nat functions for handling fork events. */
149 extern void linux_enable_event_reporting (ptid_t ptid);
151 extern int lin_lwp_attach_lwp (ptid_t ptid);
153 extern void linux_stop_lwp (struct lwp_info *lwp);
155 /* Iterator function for lin-lwp's lwp list. */
156 struct lwp_info *iterate_over_lwps (ptid_t filter,
157 int (*callback) (struct lwp_info *,
161 typedef int (*linux_nat_iterate_watchpoint_lwps_ftype) (struct lwp_info *lwp,
164 extern void linux_nat_iterate_watchpoint_lwps
165 (linux_nat_iterate_watchpoint_lwps_ftype callback, void *callback_data);
167 /* Create a prototype generic GNU/Linux target. The client can
168 override it with local methods. */
169 struct target_ops * linux_target (void);
171 /* Create a generic GNU/Linux target using traditional
172 ptrace register access. */
174 linux_trad_target (CORE_ADDR (*register_u_offset)(struct gdbarch *, int, int));
176 /* Register the customized GNU/Linux target. This should be used
177 instead of calling add_target directly. */
178 void linux_nat_add_target (struct target_ops *);
180 /* Register a method to call whenever a new thread is attached. */
181 void linux_nat_set_new_thread (struct target_ops *, void (*) (struct lwp_info *));
183 /* Register a method that converts a siginfo object between the layout
184 that ptrace returns, and the layout in the architecture of the
186 void linux_nat_set_siginfo_fixup (struct target_ops *,
187 int (*) (siginfo_t *,
191 /* Register a method to call prior to resuming a thread. */
193 void linux_nat_set_prepare_to_resume (struct target_ops *,
194 void (*) (struct lwp_info *));
196 /* Update linux-nat internal state when changing from one fork
198 void linux_nat_switch_fork (ptid_t new_ptid);
200 /* Store the saved siginfo associated with PTID in *SIGINFO.
201 Return 1 if it was retrieved successfully, 0 otherwise (*SIGINFO is
202 uninitialized in such case). */
203 int linux_nat_get_siginfo (ptid_t ptid, siginfo_t *siginfo);
205 /* Set alternative SIGTRAP-like events recognizer. */
206 void linux_nat_set_status_is_event (struct target_ops *t,
207 int (*status_is_event) (int status));