From 4b9a1ceb4a4d3b72ff94b680a7cbda7e1adaee94 Mon Sep 17 00:00:00 2001 From: KONRAD Frederic Date: Fri, 9 Mar 2018 01:39:45 -0500 Subject: [PATCH] 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. Backports commit 6e10f37c86068e35151f982c976a85f1bec07ef2 from qemu --- qemu/target/sparc/translate.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/qemu/target/sparc/translate.c b/qemu/target/sparc/translate.c index e5b6fac0..5f76d4e2 100644 --- a/qemu/target/sparc/translate.c +++ b/qemu/target/sparc/translate.c @@ -2244,6 +2244,11 @@ 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;