arch-arm: S3_<op1>_<Cn>_<Cm>_<op2> are Implementation defined

In the AArch64 ISA, S3_<op1>_<Cn>_<Cm>_<op2> refers to a pool
of implementation defined registers, provided that reg numbers
are in the following range:

<op1> is in the range 0 - 7
<CRn> can take the values 11, 15
<CRm> is in the range 0 - 15
<op2> is in the range 0 - 7

Change-Id: I7edd013e5cea4887f5e4c5a81f4835b7de93bd50
Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/10501
Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>

diff --git a/src/arch/arm/miscregs.cc b/src/arch/arm/miscregs.cc
index e1ddbf9d3cd3247254c15f763f07c521bc772593..08e37bb700a6f4341fa247243a92759d7f559324 100644 (file)
--- a/src/arch/arm/miscregs.cc
+++ b/src/arch/arm/miscregs.cc
@@ -2082,9 +2082,12 @@ decodeAArch64SysReg(unsigned op0, unsigned op1,
                     }
                     break;
                 }
-                break;
+                M5_FALLTHROUGH;
+              default:
+                // S3_<op1>_11_<Cm>_<op2>
+                return MISCREG_IMPDEF_UNIMPL;
             }
-            break;
+            M5_UNREACHABLE;
           case 12:
             switch (op1) {
               case 0:
@@ -2370,7 +2373,8 @@ decodeAArch64SysReg(unsigned op0, unsigned op1,
                 }
                 break;
             }
-            break;
+            // S3_<op1>_15_<Cm>_<op2>
+            return MISCREG_IMPDEF_UNIMPL;
         }
         break;
     }