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author | Jan Kratochvil <jan.kratochvil@redhat.com> | 2012-01-24 13:46:55 +0000 |
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committer | Jan Kratochvil <jan.kratochvil@redhat.com> | 2012-01-24 13:46:55 +0000 |
commit | 4403d8e9b35649c5b24f65c0ec0decc3839e1164 (patch) | |
tree | 05ba9cdf77784672a115e5576715b31fc7df7873 /gdb/testsuite/gdb.threads/watchpoint-fork-mt.c | |
parent | 2992c9a7112fd3b97cd693b743639e01baea3003 (diff) | |
download | gdb-4403d8e9b35649c5b24f65c0ec0decc3839e1164.zip gdb-4403d8e9b35649c5b24f65c0ec0decc3839e1164.tar.gz gdb-4403d8e9b35649c5b24f65c0ec0decc3839e1164.tar.bz2 |
gdb/
Fix watchpoints across inferior fork.
* amd64-linux-nat.c (update_debug_registers_callback): Update the
comment for linux_nat_iterate_watchpoint_lwps.
(amd64_linux_dr_set_control, amd64_linux_dr_set_addr): Use
linux_nat_iterate_watchpoint_lwps.
(amd64_linux_prepare_to_resume): New comment on Linux kernel.
* i386-linux-nat.c (update_debug_registers_callback): Update the
comment for linux_nat_iterate_watchpoint_lwps.
(i386_linux_dr_set_control, i386_linux_dr_set_addr): Use
linux_nat_iterate_watchpoint_lwps.
(i386_linux_prepare_to_resume): New comment on Linux kernel.
* i386-nat.c: Include inferior.h.
(dr_mirror): Remove.
(i386_inferior_data, struct i386_inferior_data)
(i386_inferior_data_get): New.
(i386_debug_reg_state): Use i386_inferior_data_get.
(i386_cleanup_dregs, i386_update_inferior_debug_regs)
(i386_insert_watchpoint, i386_remove_watchpoint)
(i386_stopped_data_address, i386_insert_hw_breakpoint)
(i386_remove_hw_breakpoint): New variable state, use
i386_debug_reg_state instead of DR_MIRROR.
* linux-nat.c (delete_lwp): New declaration.
(num_lwps): Move here from downwards.
(delete_lwp_cleanup): New.
(linux_child_follow_fork): Create new child_lp, call
linux_nat_new_thread and linux_nat_prepare_to_resume before calling
PTRACE_DETACH.
(num_lwps): Move upwards.
(linux_nat_iterate_watchpoint_lwps): New.
* linux-nat.h (linux_nat_iterate_watchpoint_lwps_ftype): New.
(linux_nat_iterate_watchpoint_lwps_ftype): New declaration.
gdb/testsuite/
Fix watchpoints across inferior fork.
* gdb.threads/watchpoint-fork-child.c: New file.
* gdb.threads/watchpoint-fork-mt.c: New file.
* gdb.threads/watchpoint-fork-parent.c: New file.
* gdb.threads/watchpoint-fork-st.c: New file.
* gdb.threads/watchpoint-fork.exp: New file.
* gdb.threads/watchpoint-fork.h: New file.
Diffstat (limited to 'gdb/testsuite/gdb.threads/watchpoint-fork-mt.c')
-rw-r--r-- | gdb/testsuite/gdb.threads/watchpoint-fork-mt.c | 174 |
1 files changed, 174 insertions, 0 deletions
diff --git a/gdb/testsuite/gdb.threads/watchpoint-fork-mt.c b/gdb/testsuite/gdb.threads/watchpoint-fork-mt.c new file mode 100644 index 0000000..eb07409 --- /dev/null +++ b/gdb/testsuite/gdb.threads/watchpoint-fork-mt.c @@ -0,0 +1,174 @@ +/* Test case for forgotten hw-watchpoints after fork()-off of a process. + + Copyright 2012 Free Software Foundation, Inc. + + This file is part of GDB. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#include <assert.h> +#include <unistd.h> +#include <sys/wait.h> +#include <stdio.h> +#include <stdlib.h> +#include <pthread.h> + +#include <asm/unistd.h> +#include <unistd.h> +#define gettid() syscall (__NR_gettid) + +#include "watchpoint-fork.h" + +/* Non-atomic `var++' should not hurt as we synchronize the threads by the STEP + variable. Hit-comments need to be duplicated there to catch both at-stops + and behind-stops, depending on the target. */ + +volatile int var; + +void +marker (void) +{ +} + +static void +empty (void) +{ +} + +static void +mark_exit (void) +{ +} + +pthread_t thread; +volatile int step; + +static void * +start (void *arg) +{ + int i; + + if (step >= 3) + goto step_3; + + while (step != 1) + { + i = pthread_yield (); + assert (i == 0); + } + + var++; /* validity-thread-B */ + empty (); /* validity-thread-B */ + step = 2; + while (step != 3) + { + if (step == 99) + goto step_99; + + i = pthread_yield (); + assert (i == 0); + } + +step_3: + if (step >= 5) + goto step_5; + + var++; /* after-fork1-B */ + empty (); /* after-fork1-B */ + step = 4; + while (step != 5) + { + if (step == 99) + goto step_99; + + i = pthread_yield (); + assert (i == 0); + } + +step_5: + var++; /* after-fork2-B */ + empty (); /* after-fork2-B */ + return (void *) 5UL; + +step_99: + /* We must not get caught here (against a forgotten breakpoint). */ + var++; + marker (); + return (void *) 99UL; +} + +int +main (void) +{ + int i; + void *thread_result; + + setbuf (stdout, NULL); + printf ("main: %d\n", (int) gettid ()); + + /* General hardware breakpoints and watchpoints validity. */ + marker (); + var++; /* validity-first */ + empty (); /* validity-first */ + + i = pthread_create (&thread, NULL, start, NULL); + assert (i == 0); + + var++; /* validity-thread-A */ + empty (); /* validity-thread-A */ + step = 1; + while (step != 2) + { + i = pthread_yield (); + assert (i == 0); + } + + /* Hardware watchpoints got disarmed here. */ + forkoff (1); + + var++; /* after-fork1-A */ + empty (); /* after-fork1-A */ + step = 3; +#ifdef FOLLOW_CHILD + /* Spawn new thread as it was deleted in the child of FORK. */ + i = pthread_create (&thread, NULL, start, NULL); + assert (i == 0); +#endif + while (step != 4) + { + i = pthread_yield (); + assert (i == 0); + } + + /* A sanity check for double hardware watchpoints removal. */ + forkoff (2); + + var++; /* after-fork2-A */ + empty (); /* after-fork2-A */ + step = 5; +#ifdef FOLLOW_CHILD + /* Spawn new thread as it was deleted in the child of FORK. */ + i = pthread_create (&thread, NULL, start, NULL); + assert (i == 0); +#endif + + i = pthread_join (thread, &thread_result); + assert (i == 0); + assert (thread_result == (void *) 5UL); + + mark_exit (); + return 0; +} |