Merge pull request #134 from riscv-software-src/trap_on_reserved

Add TRAP_ON_RESERVED_INSTRUCTION

Author: dhower-qc

arch/ext/Sm.yaml

@@ -291,9 +291,18 @@ Sm:
         type: boolean
     TRAP_ON_UNIMPLEMENTED_INSTRUCTION:
       description: |
-        When true, fetching an unimplemented instruction will cause an `IllegalInstruction` exception.
+        When true, fetching an unimplemented instruction from the custom encoding space will cause
+        an `IllegalInstruction` exception.
 
-        When false, fetching an unimplemented instruction is `unpredictable`.
+        When false, fetching an unimplemented instruction is `UNPREDICTABLE`.
+      schema:
+        type: boolean
+    TRAP_ON_RESERVED_INSTRUCTION:
+      description: |
+        When true, fetching an unimplemented and/or undefined instruction from the standard/reserved
+        encoding space will cause an `IllegalInstruction` exception.
+
+        When false, fetching such an instruction is `UNPREDICTABLE`.
       schema:
         type: boolean
     TRAP_ON_UNIMPLEMENTED_CSR:

cfgs/generic_rv64/params.yaml

@@ -234,6 +234,7 @@ params:
   # when false, writing an illegal value to a WLRL CSR field is ignored
   TRAP_ON_ILLEGAL_WLRL: true
   TRAP_ON_UNIMPLEMENTED_INSTRUCTION: true
+  TRAP_ON_RESERVED_INSTRUCTION: true
   TRAP_ON_UNIMPLEMENTED_CSR: true
 
   # Whether or not a real hardware `time` CSR exists. Implementations can either provide a real