[IA64] make exception handler in copy_user more robust

[pandora-kernel.git] / arch / ia64 / lib / memcpy_mck.S

diff --git a/arch/ia64/lib/memcpy_mck.S b/arch/ia64/lib/memcpy_mck.S
index 6f308e6..46c9331 100644 (file)
--- a/arch/ia64/lib/memcpy_mck.S
+++ b/arch/ia64/lib/memcpy_mck.S
@@ -625,8 +625,11 @@ EK(.ex_handler,  (p17)     st8     [dst1]=r39,8);                                          \
        clrrrb
        ;;
        alloc   saved_pfs_stack=ar.pfs,3,3,3,0
+       cmp.lt  p8,p0=A,r0
        sub     B = dst0, saved_in0     // how many byte copied so far
        ;;
+(p8)   mov     A = 0;                  // A shouldn't be negative, cap it
+       ;;
        sub     C = A, B
        sub     D = saved_in2, A
        ;;