Author: andrew
Date: Fri Sep 16 13:00:55 2016
New Revision: 305886
URL: https://svnweb.freebsd.org/changeset/base/305886

Log:
  MFC 305607:
  Trap msr/mrs instructions. These are privileged arm64 instructions and
  shouldn't normally be used.
  
  Obtained from:        ABT Systems Ltd
  Sponsored by: The FreeBSD Foundation

Modified:
  stable/11/sys/arm64/arm64/trap.c
Directory Properties:
  stable/11/   (props changed)

Modified: stable/11/sys/arm64/arm64/trap.c
==============================================================================
--- stable/11/sys/arm64/arm64/trap.c    Fri Sep 16 12:48:58 2016        
(r305885)
+++ stable/11/sys/arm64/arm64/trap.c    Fri Sep 16 13:00:55 2016        
(r305886)
@@ -388,6 +388,10 @@ do_el0_sync(struct trapframe *frame)
                call_trapsignal(td, SIGTRAP, TRAP_BRKPT, (void *)frame->tf_elr);
                userret(td, frame);
                break;
+       case EXCP_MSR:
+               call_trapsignal(td, SIGILL, ILL_PRVOPC, (void *)frame->tf_elr); 
+               userret(td, frame);
+               break;
        case EXCP_SOFTSTP_EL0:
                td->td_frame->tf_spsr &= ~PSR_SS;
                td->td_pcb->pcb_flags &= ~PCB_SINGLE_STEP;
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