sparc: fix leon3 casa instruction when MMU is disabled

Since the commit af7a06bac7d3abb2da48ef3277d2a415772d2ae8:
`casa [..](10), .., ..` (and probably others alternate space instructions)
triggers a data access exception when the MMU is disabled.

When we enter get_asi(...) dc->mem_idx is set to MMU_PHYS_IDX when the MMU
is disabled. Just keep mem_idx unchanged in this case so we passthrough the
MMU when it is disabled.

Signed-off-by: KONRAD Frederic <frederic.konrad@adacore.com>
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
(cherry picked from commit 6e10f37c86068e35151f982c976a85f1bec07ef2)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>

diff --git a/target/sparc/translate.c b/target/sparc/translate.c
index 849a02aebdb915e28a0c2ff7d0d408184a2db752..63693f72e3473caaa7a4416ed97e0a7d7e75ce8f 100644 (file)
--- a/target/sparc/translate.c
+++ b/target/sparc/translate.c
@@ -2093,6 +2093,11 @@ static DisasASI get_asi(DisasContext *dc, int insn, TCGMemOp memop)
             type = GET_ASI_BFILL;
             break;
         }
+
+        /* MMU_PHYS_IDX is used when the MMU is disabled to passthrough the
+         * permissions check in get_physical_address(..).
+         */
+        mem_idx = (dc->mem_idx == MMU_PHYS_IDX) ? MMU_PHYS_IDX : mem_idx;
     } else {
         gen_exception(dc, TT_PRIV_INSN);
         type = GET_ASI_EXCP;