[PATCH] ppc64: Add ptrace data breakpoint support

Add hardware data breakpoint support.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 9 insertions, 0 deletions

diff --git a/arch/ppc64/kernel/signal.c b/arch/ppc64/kernel/signal.c
index 49a79a55c32d..347112cca3c0 100644
--- a/arch/ppc64/kernel/signal.c
+++ b/arch/ppc64/kernel/signal.c
@@ -550,6 +550,15 @@ int do_signal(sigset_t *oldset, struct pt_regs *regs)
                 /* Whee!  Actually deliver the signal.  */
                 if (TRAP(regs) == 0x0C00)
                         syscall_restart(regs, &ka);
+
+                /*
+                 * Reenable the DABR before delivering the signal to
+                 * user space. The DABR will have been cleared if it
+                 * triggered inside the kernel.
+                 */
+                if (current->thread.dabr)
+                        set_dabr(current->thread.dabr);
+
                 return handle_signal(signr, &ka, &info, oldset, regs);
         }