sparc: allow CASA with ASI 0xa from user space

LEON3 allows the CASA instruction to be used from user space
if the ASI is set to 0xa (user data).

Signed-off-by: Alex Zuepke <azu@sysgo.de>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

target-sparc/translate.c

@@ -5097,7 +5097,8 @@ static void disas_sparc_insn(DisasContext * dc, unsigned int insn)
                     if (IS_IMM) {
                         goto illegal_insn;
                     }
-                    if (!supervisor(dc)) {
+                    /* LEON3 allows CASA from user space with ASI 0xa */
+                    if ((GET_FIELD(insn, 19, 26) != 0xa) && !supervisor(dc)) {
                         goto priv_insn;
                     }
 #endif