| 1 | /* Test case for forgotten hw-watchpoints after fork()-off of a process. |
| 2 | |
| 3 | Copyright 2012-2016 Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GDB. |
| 6 | |
| 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. |
| 11 | |
| 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. |
| 16 | |
| 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/>. */ |
| 19 | |
| 20 | #include "watchpoint-fork.h" |
| 21 | |
| 22 | #include <assert.h> |
| 23 | #include <unistd.h> |
| 24 | #include <sys/wait.h> |
| 25 | #include <stdio.h> |
| 26 | #include <stdlib.h> |
| 27 | #include <pthread.h> |
| 28 | |
| 29 | #include <asm/unistd.h> |
| 30 | #include <unistd.h> |
| 31 | #define gettid() syscall (__NR_gettid) |
| 32 | |
| 33 | /* Non-atomic `var++' should not hurt as we synchronize the threads by the STEP |
| 34 | variable. Hit-comments need to be duplicated there to catch both at-stops |
| 35 | and behind-stops, depending on the target. */ |
| 36 | |
| 37 | volatile int var; |
| 38 | |
| 39 | void |
| 40 | marker (void) |
| 41 | { |
| 42 | } |
| 43 | |
| 44 | static void |
| 45 | empty (void) |
| 46 | { |
| 47 | } |
| 48 | |
| 49 | static void |
| 50 | mark_exit (void) |
| 51 | { |
| 52 | } |
| 53 | |
| 54 | pthread_t thread; |
| 55 | volatile int step; |
| 56 | |
| 57 | static void * |
| 58 | start (void *arg) |
| 59 | { |
| 60 | int i; |
| 61 | |
| 62 | if (step >= 3) |
| 63 | goto step_3; |
| 64 | |
| 65 | while (step != 1) |
| 66 | { |
| 67 | i = pthread_yield (); |
| 68 | assert (i == 0); |
| 69 | } |
| 70 | |
| 71 | var++; /* validity-thread-B */ |
| 72 | empty (); /* validity-thread-B */ |
| 73 | step = 2; |
| 74 | while (step != 3) |
| 75 | { |
| 76 | if (step == 99) |
| 77 | goto step_99; |
| 78 | |
| 79 | i = pthread_yield (); |
| 80 | assert (i == 0); |
| 81 | } |
| 82 | |
| 83 | step_3: |
| 84 | if (step >= 5) |
| 85 | goto step_5; |
| 86 | |
| 87 | var++; /* after-fork1-B */ |
| 88 | empty (); /* after-fork1-B */ |
| 89 | step = 4; |
| 90 | while (step != 5) |
| 91 | { |
| 92 | if (step == 99) |
| 93 | goto step_99; |
| 94 | |
| 95 | i = pthread_yield (); |
| 96 | assert (i == 0); |
| 97 | } |
| 98 | |
| 99 | step_5: |
| 100 | var++; /* after-fork2-B */ |
| 101 | empty (); /* after-fork2-B */ |
| 102 | return (void *) 5UL; |
| 103 | |
| 104 | step_99: |
| 105 | /* We must not get caught here (against a forgotten breakpoint). */ |
| 106 | var++; |
| 107 | marker (); |
| 108 | return (void *) 99UL; |
| 109 | } |
| 110 | |
| 111 | int |
| 112 | main (void) |
| 113 | { |
| 114 | int i; |
| 115 | void *thread_result; |
| 116 | |
| 117 | setbuf (stdout, NULL); |
| 118 | printf ("main: %d\n", (int) gettid ()); |
| 119 | |
| 120 | /* General hardware breakpoints and watchpoints validity. */ |
| 121 | marker (); |
| 122 | var++; /* validity-first */ |
| 123 | empty (); /* validity-first */ |
| 124 | |
| 125 | i = pthread_create (&thread, NULL, start, NULL); |
| 126 | assert (i == 0); |
| 127 | |
| 128 | var++; /* validity-thread-A */ |
| 129 | empty (); /* validity-thread-A */ |
| 130 | step = 1; |
| 131 | while (step != 2) |
| 132 | { |
| 133 | i = pthread_yield (); |
| 134 | assert (i == 0); |
| 135 | } |
| 136 | |
| 137 | /* Hardware watchpoints got disarmed here. */ |
| 138 | forkoff (1); |
| 139 | |
| 140 | var++; /* after-fork1-A */ |
| 141 | empty (); /* after-fork1-A */ |
| 142 | step = 3; |
| 143 | #ifdef FOLLOW_CHILD |
| 144 | /* Spawn new thread as it was deleted in the child of FORK. */ |
| 145 | i = pthread_create (&thread, NULL, start, NULL); |
| 146 | assert (i == 0); |
| 147 | #endif |
| 148 | while (step != 4) |
| 149 | { |
| 150 | i = pthread_yield (); |
| 151 | assert (i == 0); |
| 152 | } |
| 153 | |
| 154 | /* A sanity check for double hardware watchpoints removal. */ |
| 155 | forkoff (2); |
| 156 | |
| 157 | var++; /* after-fork2-A */ |
| 158 | empty (); /* after-fork2-A */ |
| 159 | step = 5; |
| 160 | #ifdef FOLLOW_CHILD |
| 161 | /* Spawn new thread as it was deleted in the child of FORK. */ |
| 162 | i = pthread_create (&thread, NULL, start, NULL); |
| 163 | assert (i == 0); |
| 164 | #endif |
| 165 | |
| 166 | i = pthread_join (thread, &thread_result); |
| 167 | assert (i == 0); |
| 168 | assert (thread_result == (void *) 5UL); |
| 169 | |
| 170 | mark_exit (); |
| 171 | return 0; |
| 172 | } |