diff options
Diffstat (limited to 'arch/powerpc/kernel/hw_breakpoint.c')
| -rw-r--r-- | arch/powerpc/kernel/hw_breakpoint.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/hw_breakpoint.c b/arch/powerpc/kernel/hw_breakpoint.c index 7a2ad5e84c1..7bd01a56d19 100644 --- a/arch/powerpc/kernel/hw_breakpoint.c +++ b/arch/powerpc/kernel/hw_breakpoint.c @@ -175,6 +175,24 @@ int arch_validate_hwbkpt_settings(struct perf_event *bp) } /* + * Restores the breakpoint on the debug registers. + * Invoke this function if it is known that the execution context is + * about to change to cause loss of MSR_SE settings. + */ +void thread_change_pc(struct task_struct *tsk, struct pt_regs *regs) +{ + struct arch_hw_breakpoint *info; + + if (likely(!tsk->thread.last_hit_ubp)) + return; + + info = counter_arch_bp(tsk->thread.last_hit_ubp); + regs->msr &= ~MSR_SE; + set_dabr(info->address | info->type | DABR_TRANSLATION); + tsk->thread.last_hit_ubp = NULL; +} + +/* * Handle debug exception notifications. */ int __kprobes hw_breakpoint_handler(struct die_args *args) |