1 /* Native debugging support for GNU/Linux (LWP layer).
3 Copyright (C) 2000-2018 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 we sent this LWP a SIGSTOP (but the LWP didn't report
44 /* Non-zero if this LWP is stopped. */
47 /* Non-zero if this LWP will be/has been resumed. Note that an LWP
48 can be marked both as stopped and resumed at the same time. This
49 happens if we try to resume an LWP that has a wait status
50 pending. We shouldn't let the LWP run until that wait status has
51 been processed, but we should not report that wait status if GDB
52 didn't try to let the LWP run. */
55 /* The last resume GDB requested on this thread. */
56 enum resume_kind last_resume_kind;
58 /* If non-zero, a pending wait status. */
61 /* When 'stopped' is set, this is where the lwp last stopped, with
62 decr_pc_after_break already accounted for. If the LWP is
63 running, and stepping, this is the address at which the lwp was
64 resumed (that is, it's the previous stop PC). If the LWP is
65 running and not stepping, this is 0. */
68 /* Non-zero if we were stepping this LWP. */
71 /* The reason the LWP last stopped, if we need to track it
72 (breakpoint, watchpoint, etc.) */
73 enum target_stop_reason stop_reason;
75 /* On architectures where it is possible to know the data address of
76 a triggered watchpoint, STOPPED_DATA_ADDRESS_P is non-zero, and
77 STOPPED_DATA_ADDRESS contains such data address. Otherwise,
78 STOPPED_DATA_ADDRESS_P is false, and STOPPED_DATA_ADDRESS is
79 undefined. Only valid if STOPPED_BY_WATCHPOINT is true. */
80 int stopped_data_address_p;
81 CORE_ADDR stopped_data_address;
83 /* Non-zero if we expect a duplicated SIGINT. */
86 /* If WAITSTATUS->KIND != TARGET_WAITKIND_SPURIOUS, the waitstatus
87 for this LWP's last event. This may correspond to STATUS above,
88 or to a local variable in lin_lwp_wait. */
89 struct target_waitstatus waitstatus;
91 /* Signal whether we are in a SYSCALL_ENTRY or
92 in a SYSCALL_RETURN event.
94 - TARGET_WAITKIND_SYSCALL_ENTRY
95 - TARGET_WAITKIND_SYSCALL_RETURN */
96 enum target_waitkind syscall_state;
98 /* The processor core this LWP was last seen on. */
101 /* Arch-specific additions. */
102 struct arch_lwp_info *arch_private;
104 /* Previous and next pointers in doubly-linked list of known LWPs,
105 sorted by reverse creation order. */
106 struct lwp_info *prev;
107 struct lwp_info *next;
110 /* The global list of LWPs, for ALL_LWPS. Unlike the threads list,
111 there is always at least one LWP on the list while the GNU/Linux
112 native target is active. */
113 extern struct lwp_info *lwp_list;
115 /* Does the current host support PTRACE_GETREGSET? */
116 extern enum tribool have_ptrace_getregset;
118 /* Iterate over each active thread (light-weight process). */
119 #define ALL_LWPS(LP) \
120 for ((LP) = lwp_list; \
124 /* Attempt to initialize libthread_db. */
125 void check_for_thread_db (void);
127 /* Called from the LWP layer to inform the thread_db layer that PARENT
128 spawned CHILD. Both LWPs are currently stopped. This function
129 does whatever is required to have the child LWP under the
130 thread_db's control --- e.g., enabling event reporting. Returns
131 true on success, false if the process isn't using libpthread. */
132 extern int thread_db_notice_clone (ptid_t parent, ptid_t child);
134 /* Return the set of signals used by the threads library. */
135 extern void lin_thread_get_thread_signals (sigset_t *mask);
137 /* Find process PID's pending signal set from /proc/pid/status. */
138 void linux_proc_pending_signals (int pid, sigset_t *pending,
139 sigset_t *blocked, sigset_t *ignored);
141 /* For linux_stop_lwp see nat/linux-nat.h. */
143 /* Stop all LWPs, synchronously. (Any events that trigger while LWPs
144 are being stopped are left pending.) */
145 extern void linux_stop_and_wait_all_lwps (void);
147 /* Set resumed LWPs running again, as they were before being stopped
148 with linux_stop_and_wait_all_lwps. (LWPS with pending events are
150 extern void linux_unstop_all_lwps (void);
152 /* Create a prototype generic GNU/Linux target. The client can
153 override it with local methods. */
154 struct target_ops * linux_target (void);
156 /* Make a prototype generic GNU/Linux target. The client can override
157 it with local methods. */
158 void linux_target_install_ops (struct target_ops *t);
160 /* Register the customized GNU/Linux target. This should be used
161 instead of calling add_target directly. */
162 void linux_nat_add_target (struct target_ops *);
164 /* Register a method to call whenever a new thread is attached. */
165 void linux_nat_set_new_thread (struct target_ops *, void (*) (struct lwp_info *));
167 /* Register a method to call whenever a new thread is deleted. */
168 void linux_nat_set_delete_thread (struct target_ops *,
169 void (*) (struct arch_lwp_info *));
171 /* Register a method to call whenever a new fork is attached. */
172 typedef void (linux_nat_new_fork_ftype) (struct lwp_info *parent,
174 void linux_nat_set_new_fork (struct target_ops *ops,
175 linux_nat_new_fork_ftype *fn);
177 /* Register a method to call whenever a process is killed or
179 typedef void (linux_nat_forget_process_ftype) (pid_t pid);
180 void linux_nat_set_forget_process (struct target_ops *ops,
181 linux_nat_forget_process_ftype *fn);
183 /* Call the method registered with the function above. PID is the
184 process to forget about. */
185 void linux_nat_forget_process (pid_t pid);
187 /* Register a method that converts a siginfo object between the layout
188 that ptrace returns, and the layout in the architecture of the
190 void linux_nat_set_siginfo_fixup (struct target_ops *,
191 int (*) (siginfo_t *,
195 /* Register a method to call prior to resuming a thread. */
197 void linux_nat_set_prepare_to_resume (struct target_ops *,
198 void (*) (struct lwp_info *));
200 /* Update linux-nat internal state when changing from one fork
202 void linux_nat_switch_fork (ptid_t new_ptid);
204 /* Store the saved siginfo associated with PTID in *SIGINFO.
205 Return 1 if it was retrieved successfully, 0 otherwise (*SIGINFO is
206 uninitialized in such case). */
207 int linux_nat_get_siginfo (ptid_t ptid, siginfo_t *siginfo);
209 /* Set alternative SIGTRAP-like events recognizer. */
210 void linux_nat_set_status_is_event (struct target_ops *t,
211 int (*status_is_event) (int status));