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aacbb8a5 LM |
1 | /* This testcase is part of GDB, the GNU debugger. |
2 | ||
ecd75fc8 | 3 | Copyright 2009-2014 Free Software Foundation, Inc. |
aacbb8a5 LM |
4 | |
5 | This program is free software; you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License as published by | |
7 | the Free Software Foundation; either version 3 of the License, or | |
8 | (at your option) any later version. | |
9 | ||
10 | This program is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | GNU General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU General Public License | |
16 | along with this program. If not, see <http://www.gnu.org/licenses/>. | |
17 | ||
18 | Check that hardware watchpoints get correctly replicated to all | |
19 | existing threads when hardware watchpoints are created. This test | |
20 | creates one hardware watchpoint per thread until a maximum is | |
21 | reached. It originally addresses a deficiency seen on embedded | |
22 | powerpc targets with slotted hardware *point designs. | |
23 | */ | |
24 | ||
25 | #include <stdio.h> | |
26 | #include <unistd.h> | |
27 | #include <stdlib.h> | |
28 | #include <stdint.h> | |
29 | #include <pthread.h> | |
30 | ||
31 | #ifndef NR_THREADS | |
32 | #define NR_THREADS 4 /* Set by the testcase. */ | |
33 | #endif | |
34 | ||
35 | #ifndef X_INCR_COUNT | |
36 | #define X_INCR_COUNT 10 /* Set by the testcase. */ | |
37 | #endif | |
38 | ||
39 | void *thread_function (void *arg); /* Function executed by each thread. */ | |
40 | ||
41 | /* Used to hold threads back until wp-replication.exp is ready. */ | |
42 | int test_ready = 0; | |
43 | ||
44 | /* Used to hold threads back until every thread has had a chance of causing | |
45 | a watchpoint trigger. This prevents a situation in GDB where it may miss | |
46 | watchpoint triggers when threads exit while other threads are causing | |
47 | watchpoint triggers. */ | |
48 | int can_terminate = 0; | |
49 | ||
50 | /* Used to push the program out of the waiting loop after the | |
51 | testcase is done counting the number of hardware watchpoints | |
52 | available for our target. */ | |
53 | int watch_count_done = 0; | |
54 | ||
55 | /* Number of watchpoints GDB is capable of using (this is provided | |
56 | by GDB during the test run). */ | |
57 | int hw_watch_count = 0; | |
58 | ||
59 | /* Array with elements we can create watchpoints for. */ | |
60 | static int watched_data[NR_THREADS]; | |
61 | pthread_mutex_t data_mutex; | |
62 | ||
63 | /* Wait function to keep threads busy while the testcase does | |
64 | what it needs to do. */ | |
65 | void | |
66 | empty_cycle (void) | |
67 | { | |
68 | usleep (1); | |
69 | } | |
70 | ||
71 | int | |
72 | main () | |
73 | { | |
74 | int res; | |
75 | pthread_t threads[NR_THREADS]; | |
76 | int i; | |
77 | ||
e6ba475a DE |
78 | /* Something to ensure that the breakpoint used to run to main |
79 | is only hit once. */ | |
80 | empty_cycle (); | |
81 | ||
aacbb8a5 LM |
82 | while (watch_count_done == 0) |
83 | { | |
e6ba475a DE |
84 | /* GDB will modify the value of "watch_count_done" at runtime and we |
85 | will get past this point. */ | |
aacbb8a5 LM |
86 | empty_cycle (); |
87 | } | |
88 | ||
89 | pthread_mutex_init (&data_mutex, NULL); | |
90 | ||
91 | for (i = 0; i < NR_THREADS; i++) | |
92 | { | |
93 | res = pthread_create (&threads[i], | |
94 | NULL, thread_function, | |
95 | (void *) (intptr_t) i); | |
96 | if (res != 0) | |
97 | { | |
98 | fprintf (stderr, "error in thread %d create\n", i); | |
99 | abort (); | |
100 | } | |
101 | } | |
102 | ||
103 | for (i = 0; i < NR_THREADS; ++i) | |
104 | { | |
105 | res = pthread_join (threads[i], NULL); | |
106 | if (res != 0) | |
107 | { | |
108 | fprintf (stderr, "error in thread %d join\n", i); | |
109 | abort (); | |
110 | } | |
111 | } | |
112 | ||
113 | exit (EXIT_SUCCESS); | |
114 | } | |
115 | ||
116 | /* Easy place for a breakpoint. | |
117 | wp-replication.exp uses this to track when all threads are running | |
118 | instead of, for example, the program keeping track | |
119 | because we don't need the program to know when all threads are running, | |
120 | instead we need gdb to know when all threads are running. | |
121 | There is a delay between when a thread has started and when the thread | |
122 | has been registered with gdb. */ | |
123 | ||
124 | void | |
125 | thread_started (void) | |
126 | { | |
127 | } | |
128 | ||
129 | void * | |
130 | thread_function (void *arg) | |
131 | { | |
132 | int i, j; | |
133 | long thread_number = (long) arg; | |
134 | ||
135 | thread_started (); | |
136 | ||
137 | /* Don't start incrementing X until wp-replication.exp is ready. */ | |
138 | while (!test_ready) | |
139 | usleep (1); | |
140 | ||
141 | pthread_mutex_lock (&data_mutex); | |
142 | ||
143 | for (i = 0; i < NR_TRIGGERS_PER_THREAD; i++) | |
144 | { | |
145 | for (j = 0; j < hw_watch_count; j++) | |
146 | { | |
147 | /* For debugging. */ | |
148 | printf ("Thread %ld changing watch_thread[%d] data" | |
149 | " from %d -> %d\n", thread_number, j, | |
150 | watched_data[j], watched_data[j] + 1); | |
151 | /* Increment the watched data field. */ | |
152 | watched_data[j]++; | |
153 | } | |
154 | } | |
155 | ||
156 | pthread_mutex_unlock (&data_mutex); | |
157 | ||
158 | /* Hold the threads here to work around a problem GDB has evaluating | |
159 | watchpoints right when a DSO event shows up (PR breakpoints/10116). | |
160 | Sleep a little longer (than, say, 1, 5 or 10) to avoid consuming | |
161 | lots of cycles while the other threads are trying to execute the | |
162 | loop. */ | |
163 | while (!can_terminate) | |
164 | usleep (100); | |
165 | ||
166 | pthread_exit (NULL); | |
167 | } |