diff options
Diffstat (limited to 'gdb/gdbserver/linux-aarch64-low.c')
| -rw-r--r-- | gdb/gdbserver/linux-aarch64-low.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/gdb/gdbserver/linux-aarch64-low.c b/gdb/gdbserver/linux-aarch64-low.c index d44175e..7e6e9ac 100644 --- a/gdb/gdbserver/linux-aarch64-low.c +++ b/gdb/gdbserver/linux-aarch64-low.c @@ -1135,6 +1135,33 @@ aarch64_linux_new_thread (struct lwp_info *lwp) lwp->arch_private = info; } +static void +aarch64_linux_new_fork (struct process_info *parent, + struct process_info *child) +{ + /* These are allocated by linux_add_process. */ + gdb_assert (parent->private != NULL + && parent->private->arch_private != NULL); + gdb_assert (child->private != NULL + && child->private->arch_private != NULL); + + /* Linux kernel before 2.6.33 commit + 72f674d203cd230426437cdcf7dd6f681dad8b0d + will inherit hardware debug registers from parent + on fork/vfork/clone. Newer Linux kernels create such tasks with + zeroed debug registers. + + GDB core assumes the child inherits the watchpoints/hw + breakpoints of the parent, and will remove them all from the + forked off process. Copy the debug registers mirrors into the + new process so that all breakpoints and watchpoints can be + removed together. The debug registers mirror will become zeroed + in the end before detaching the forked off process, thus making + this compatible with older Linux kernels too. */ + + *child->private->arch_private = *parent->private->arch_private; +} + /* Called when resuming a thread. If the debug regs have changed, update the thread's copies. */ @@ -1299,6 +1326,7 @@ struct linux_target_ops the_low_target = NULL, aarch64_linux_new_process, aarch64_linux_new_thread, + aarch64_linux_new_fork, aarch64_linux_prepare_to_resume, }; |