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0274a8ce | 1 | /* Native debugging support for GNU/Linux (LWP layer). |
10d6c8cd | 2 | |
4c38e0a4 | 3 | Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, |
7b6bb8da | 4 | 2010, 2011 Free Software Foundation, Inc. |
0274a8ce MS |
5 | |
6 | This file is part of GDB. | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 10 | the Free Software Foundation; either version 3 of the License, or |
0274a8ce MS |
11 | (at your option) any later version. |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
0274a8ce | 20 | |
a2f23071 DJ |
21 | #include "target.h" |
22 | ||
9f0bdab8 DJ |
23 | #include <signal.h> |
24 | ||
25289eb2 PA |
25 | /* Ways to "resume" a thread. */ |
26 | ||
27 | enum resume_kind | |
28 | { | |
29 | /* Thread should continue. */ | |
30 | resume_continue, | |
31 | ||
32 | /* Thread should single-step. */ | |
33 | resume_step, | |
34 | ||
35 | /* Thread should be stopped. */ | |
36 | resume_stop | |
37 | }; | |
38 | ||
9f0bdab8 DJ |
39 | /* Structure describing an LWP. This is public only for the purposes |
40 | of ALL_LWPS; target-specific code should generally not access it | |
41 | directly. */ | |
0274a8ce MS |
42 | |
43 | struct lwp_info | |
44 | { | |
45 | /* The process id of the LWP. This is a combination of the LWP id | |
46 | and overall process id. */ | |
47 | ptid_t ptid; | |
48 | ||
49 | /* Non-zero if this LWP is cloned. In this context "cloned" means | |
50 | that the LWP is reporting to its parent using a signal other than | |
51 | SIGCHLD. */ | |
52 | int cloned; | |
53 | ||
54 | /* Non-zero if we sent this LWP a SIGSTOP (but the LWP didn't report | |
55 | it back yet). */ | |
56 | int signalled; | |
57 | ||
58 | /* Non-zero if this LWP is stopped. */ | |
59 | int stopped; | |
60 | ||
61 | /* Non-zero if this LWP will be/has been resumed. Note that an LWP | |
62 | can be marked both as stopped and resumed at the same time. This | |
63 | happens if we try to resume an LWP that has a wait status | |
64 | pending. We shouldn't let the LWP run until that wait status has | |
65 | been processed, but we should not report that wait status if GDB | |
66 | didn't try to let the LWP run. */ | |
67 | int resumed; | |
68 | ||
25289eb2 PA |
69 | /* The last resume GDB requested on this thread. */ |
70 | enum resume_kind last_resume_kind; | |
71 | ||
0274a8ce MS |
72 | /* If non-zero, a pending wait status. */ |
73 | int status; | |
74 | ||
75 | /* Non-zero if we were stepping this LWP. */ | |
76 | int step; | |
77 | ||
9f0bdab8 DJ |
78 | /* Non-zero si_signo if this LWP stopped with a trap. si_addr may |
79 | be the address of a hardware watchpoint. */ | |
80 | struct siginfo siginfo; | |
81 | ||
ebec9a0f PA |
82 | /* STOPPED_BY_WATCHPOINT is non-zero if this LWP stopped with a data |
83 | watchpoint trap. */ | |
84 | int stopped_by_watchpoint; | |
85 | ||
86 | /* On architectures where it is possible to know the data address of | |
87 | a triggered watchpoint, STOPPED_DATA_ADDRESS_P is non-zero, and | |
88 | STOPPED_DATA_ADDRESS contains such data address. Otherwise, | |
89 | STOPPED_DATA_ADDRESS_P is false, and STOPPED_DATA_ADDRESS is | |
90 | undefined. Only valid if STOPPED_BY_WATCHPOINT is true. */ | |
91 | int stopped_data_address_p; | |
92 | CORE_ADDR stopped_data_address; | |
93 | ||
57380f4e DJ |
94 | /* Non-zero if we expect a duplicated SIGINT. */ |
95 | int ignore_sigint; | |
96 | ||
a2f23071 DJ |
97 | /* If WAITSTATUS->KIND != TARGET_WAITKIND_SPURIOUS, the waitstatus |
98 | for this LWP's last event. This may correspond to STATUS above, | |
99 | or to a local variable in lin_lwp_wait. */ | |
100 | struct target_waitstatus waitstatus; | |
101 | ||
a96d9b2e SDJ |
102 | /* Signal wether we are in a SYSCALL_ENTRY or |
103 | in a SYSCALL_RETURN event. | |
104 | Values: | |
105 | - TARGET_WAITKIND_SYSCALL_ENTRY | |
106 | - TARGET_WAITKIND_SYSCALL_RETURN */ | |
107 | int syscall_state; | |
108 | ||
dc146f7c VP |
109 | /* The processor core this LWP was last seen on. */ |
110 | int core; | |
111 | ||
0274a8ce MS |
112 | /* Next LWP in list. */ |
113 | struct lwp_info *next; | |
114 | }; | |
115 | ||
9f0bdab8 DJ |
116 | /* The global list of LWPs, for ALL_LWPS. Unlike the threads list, |
117 | there is always at least one LWP on the list while the GNU/Linux | |
118 | native target is active. */ | |
119 | extern struct lwp_info *lwp_list; | |
120 | ||
4c38200f PA |
121 | /* Iterate over each active thread (light-weight process). */ |
122 | #define ALL_LWPS(LP) \ | |
123 | for ((LP) = lwp_list; \ | |
9f0bdab8 | 124 | (LP) != NULL; \ |
4c38200f | 125 | (LP) = (LP)->next) |
9f0bdab8 | 126 | |
17faa917 DJ |
127 | #define GET_LWP(ptid) ptid_get_lwp (ptid) |
128 | #define GET_PID(ptid) ptid_get_pid (ptid) | |
129 | #define is_lwp(ptid) (GET_LWP (ptid) != 0) | |
130 | #define BUILD_LWP(lwp, pid) ptid_build (pid, lwp, 0) | |
131 | ||
0ec9a092 DJ |
132 | /* Attempt to initialize libthread_db. */ |
133 | void check_for_thread_db (void); | |
0274a8ce | 134 | |
4c28f408 PA |
135 | int thread_db_attach_lwp (ptid_t ptid); |
136 | ||
669211f5 UW |
137 | /* Return the set of signals used by the threads library. */ |
138 | extern void lin_thread_get_thread_signals (sigset_t *mask); | |
139 | ||
bfb39158 | 140 | /* Find process PID's pending signal set from /proc/pid/status. */ |
3e43a32a MS |
141 | void linux_proc_pending_signals (int pid, sigset_t *pending, |
142 | sigset_t *blocked, sigset_t *ignored); | |
bfb39158 | 143 | |
4de4c07c | 144 | /* linux-nat functions for handling fork events. */ |
4de4c07c | 145 | extern void linux_enable_event_reporting (ptid_t ptid); |
0274a8ce | 146 | |
93815fbf | 147 | extern int lin_lwp_attach_lwp (ptid_t ptid); |
9ee57c33 | 148 | |
0274a8ce | 149 | /* Iterator function for lin-lwp's lwp list. */ |
d90e17a7 PA |
150 | struct lwp_info *iterate_over_lwps (ptid_t filter, |
151 | int (*callback) (struct lwp_info *, | |
0274a8ce MS |
152 | void *), |
153 | void *data); | |
10d6c8cd | 154 | |
155bd5d1 AC |
155 | /* Create a prototype generic GNU/Linux target. The client can |
156 | override it with local methods. */ | |
10d6c8cd | 157 | struct target_ops * linux_target (void); |
f973ed9c | 158 | |
910122bf UW |
159 | /* Create a generic GNU/Linux target using traditional |
160 | ptrace register access. */ | |
161 | struct target_ops * | |
7714d83a | 162 | linux_trad_target (CORE_ADDR (*register_u_offset)(struct gdbarch *, int, int)); |
910122bf | 163 | |
155bd5d1 | 164 | /* Register the customized GNU/Linux target. This should be used |
f973ed9c DJ |
165 | instead of calling add_target directly. */ |
166 | void linux_nat_add_target (struct target_ops *); | |
167 | ||
9f0bdab8 DJ |
168 | /* Register a method to call whenever a new thread is attached. */ |
169 | void linux_nat_set_new_thread (struct target_ops *, void (*) (ptid_t)); | |
170 | ||
5b009018 PA |
171 | /* Register a method that converts a siginfo object between the layout |
172 | that ptrace returns, and the layout in the architecture of the | |
173 | inferior. */ | |
174 | void linux_nat_set_siginfo_fixup (struct target_ops *, | |
175 | int (*) (struct siginfo *, | |
176 | gdb_byte *, | |
177 | int)); | |
178 | ||
f973ed9c DJ |
179 | /* Update linux-nat internal state when changing from one fork |
180 | to another. */ | |
181 | void linux_nat_switch_fork (ptid_t new_ptid); | |
9f0bdab8 DJ |
182 | |
183 | /* Return the saved siginfo associated with PTID. */ | |
184 | struct siginfo *linux_nat_get_siginfo (ptid_t ptid); | |
dc146f7c VP |
185 | |
186 | /* Compute and return the processor core of a given thread. */ | |
187 | int linux_nat_core_of_thread_1 (ptid_t ptid); | |
26ab7092 JK |
188 | |
189 | /* Set alternative SIGTRAP-like events recognizer. */ | |
190 | void linux_nat_set_status_is_event (struct target_ops *t, | |
191 | int (*status_is_event) (int status)); |