svn commit: r305607 - head/sys/arm64/arm64

[Andrew Turner]

Author: andrew
Date: Thu Sep  8 12:53:01 2016
New Revision: 305607
URL: https://svnweb.freebsd.org/changeset/base/305607

Log:
  Trap msr/mrs instructions. These are privileged arm64 instructions and
  shouldn't normally be used.
  
  Obtained from:	ABT Systems Ltd
  MFC after:	1 week
  Sponsored by:	The FreeBSD Foundation

Modified:
  head/sys/arm64/arm64/trap.c

Modified: head/sys/arm64/arm64/trap.c
==============================================================================
--- head/sys/arm64/arm64/trap.c	Thu Sep  8 12:43:24 2016	(r305606)
+++ head/sys/arm64/arm64/trap.c	Thu Sep  8 12:53:01 2016	(r305607)
@@ -391,6 +391,10 @@ 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;