MN10300: Fix register-postinc addressing misalignment handling

Fix misalignment handling of operands with register postincrement addressing.
The flag to indicate that postincrement is required should not be interpreted
as an specification of a value to be added to the address.

Also add BUGs to catch unimplemented parameter markings in the opcodes table.
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/mn10300/mm/misalignment.c

@@ -543,7 +543,7 @@ static int misalignment_addr(unsigned long *registers, unsigned params,
 {
 	unsigned long *postinc = NULL, address = 0, tmp;
 
-	params &= 0x7fffffff;
+	params &= 0x00ffffff;
 
 	do {
 		switch (params & 0xff) {
@@ -631,6 +631,7 @@ static int misalignment_addr(unsigned long *registers, unsigned params,
 			address += disp;
 			break;
 		default:
+			BUG();
 			return 0;
 		}
 	} while ((params >>= 8));
@@ -697,6 +698,7 @@ static int misalignment_reg(unsigned long *registers, unsigned params,
 		break;
 
 	default:
+		BUG();
 		return 0;
 	}