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/>. */
20 #include "nat/linux-nat.h"
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 /* When 'stopped' is set, this is where the lwp last stopped, with
67 decr_pc_after_break already accounted for. If the LWP is
68 running, and stepping, this is the address at which the lwp was
69 resumed (that is, it's the previous stop PC). If the LWP is
70 running and not stepping, this is 0. */
73 /* Non-zero if we were stepping this LWP. */
76 /* The reason the LWP last stopped, if we need to track it
77 (breakpoint, watchpoint, etc.) */
78 enum target_stop_reason stop_reason;
80 /* On architectures where it is possible to know the data address of
81 a triggered watchpoint, STOPPED_DATA_ADDRESS_P is non-zero, and
82 STOPPED_DATA_ADDRESS contains such data address. Otherwise,
83 STOPPED_DATA_ADDRESS_P is false, and STOPPED_DATA_ADDRESS is
84 undefined. Only valid if STOPPED_BY_WATCHPOINT is true. */
85 int stopped_data_address_p;
86 CORE_ADDR stopped_data_address;
88 /* Non-zero if we expect a duplicated SIGINT. */
91 /* If WAITSTATUS->KIND != TARGET_WAITKIND_SPURIOUS, the waitstatus
92 for this LWP's last event. This may correspond to STATUS above,
93 or to a local variable in lin_lwp_wait. */
94 struct target_waitstatus waitstatus;
96 /* Signal wether we are in a SYSCALL_ENTRY or
97 in a SYSCALL_RETURN event.
99 - TARGET_WAITKIND_SYSCALL_ENTRY
100 - TARGET_WAITKIND_SYSCALL_RETURN */
101 enum target_waitkind syscall_state;
103 /* The processor core this LWP was last seen on. */
106 /* Arch-specific additions. */
107 struct arch_lwp_info *arch_private;
109 /* Next LWP in list. */
110 struct lwp_info *next;
113 /* The global list of LWPs, for ALL_LWPS. Unlike the threads list,
114 there is always at least one LWP on the list while the GNU/Linux
115 native target is active. */
116 extern struct lwp_info *lwp_list;
118 /* Does the current host support PTRACE_GETREGSET? */
119 extern enum tribool have_ptrace_getregset;
121 /* Iterate over each active thread (light-weight process). */
122 #define ALL_LWPS(LP) \
123 for ((LP) = lwp_list; \
127 /* Attempt to initialize libthread_db. */
128 void check_for_thread_db (void);
130 /* Called from the LWP layer to inform the thread_db layer that PARENT
131 spawned CHILD. Both LWPs are currently stopped. This function
132 does whatever is required to have the child LWP under the
133 thread_db's control --- e.g., enabling event reporting. Returns
134 true on success, false if the process isn't using libpthread. */
135 extern int thread_db_notice_clone (ptid_t parent, ptid_t child);
137 /* Return the set of signals used by the threads library. */
138 extern void lin_thread_get_thread_signals (sigset_t *mask);
140 /* Find process PID's pending signal set from /proc/pid/status. */
141 void linux_proc_pending_signals (int pid, sigset_t *pending,
142 sigset_t *blocked, sigset_t *ignored);
144 /* For linux_stop_lwp see nat/linux-nat.h. */
146 /* Stop all LWPs, synchronously. (Any events that trigger while LWPs
147 are being stopped are left pending.) */
148 extern void linux_stop_and_wait_all_lwps (void);
150 /* Set resumed LWPs running again, as they were before being stopped
151 with linux_stop_and_wait_all_lwps. (LWPS with pending events are
153 extern void linux_unstop_all_lwps (void);
155 /* Create a prototype generic GNU/Linux target. The client can
156 override it with local methods. */
157 struct target_ops * linux_target (void);
159 /* Create a generic GNU/Linux target using traditional
160 ptrace register access. */
162 linux_trad_target (CORE_ADDR (*register_u_offset)(struct gdbarch *, int, int));
164 /* Register the customized GNU/Linux target. This should be used
165 instead of calling add_target directly. */
166 void linux_nat_add_target (struct target_ops *);
168 /* Register a method to call whenever a new thread is attached. */
169 void linux_nat_set_new_thread (struct target_ops *, void (*) (struct lwp_info *));
172 /* Register a method to call whenever a new fork is attached. */
173 typedef void (linux_nat_new_fork_ftype) (struct lwp_info *parent,
175 void linux_nat_set_new_fork (struct target_ops *ops,
176 linux_nat_new_fork_ftype *fn);
178 /* Register a method to call whenever a process is killed or
180 typedef void (linux_nat_forget_process_ftype) (pid_t pid);
181 void linux_nat_set_forget_process (struct target_ops *ops,
182 linux_nat_forget_process_ftype *fn);
184 /* Call the method registered with the function above. PID is the
185 process to forget about. */
186 void linux_nat_forget_process (pid_t pid);
188 /* Register a method that converts a siginfo object between the layout
189 that ptrace returns, and the layout in the architecture of the
191 void linux_nat_set_siginfo_fixup (struct target_ops *,
192 int (*) (siginfo_t *,
196 /* Register a method to call prior to resuming a thread. */
198 void linux_nat_set_prepare_to_resume (struct target_ops *,
199 void (*) (struct lwp_info *));
201 /* Update linux-nat internal state when changing from one fork
203 void linux_nat_switch_fork (ptid_t new_ptid);
205 /* Store the saved siginfo associated with PTID in *SIGINFO.
206 Return 1 if it was retrieved successfully, 0 otherwise (*SIGINFO is
207 uninitialized in such case). */
208 int linux_nat_get_siginfo (ptid_t ptid, siginfo_t *siginfo);
210 /* Set alternative SIGTRAP-like events recognizer. */
211 void linux_nat_set_status_is_event (struct target_ops *t,
212 int (*status_is_event) (int status));