diff mbox series

[v7,47/64] target/nios2: Enable unaligned traps for system mode

Message ID 20220421151735.31996-48-richard.henderson@linaro.org
State Superseded
Headers show
Series nios2 fixes, cleanups, shadow reg sets | expand

Commit Message

Richard Henderson April 21, 2022, 3:17 p.m. UTC 
Unaligned traps are optional, but required with an mmu.
Turn them on always, because the fallback behaviour undefined.

Enable alignment checks in the config file.
Unwind the guest pc properly from do_unaligned_access.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 configs/targets/nios2-softmmu.mak | 1 +
 target/nios2/helper.c             | 4 ++--
 2 files changed, 3 insertions(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/configs/targets/nios2-softmmu.mak b/configs/targets/nios2-softmmu.mak
index 9a372f0717..1e93b54cd1 100644
--- a/configs/targets/nios2-softmmu.mak
+++ b/configs/targets/nios2-softmmu.mak
@@ -1 +1,2 @@ 
 TARGET_ARCH=nios2
+TARGET_ALIGNED_ONLY=y
diff --git a/target/nios2/helper.c b/target/nios2/helper.c
index c5a2dd65b1..2e9fea4a01 100644
--- a/target/nios2/helper.c
+++ b/target/nios2/helper.c
@@ -241,8 +241,8 @@  void nios2_cpu_do_unaligned_access(CPUState *cs, vaddr addr,
     CPUNios2State *env = &cpu->env;
 
     env->ctrl[CR_BADADDR] = addr;
-    env->ctrl[CR_EXCEPTION] = FIELD_DP32(0, CR_EXCEPTION, CAUSE, EXCP_UNALIGN);
-    helper_raise_exception(env, EXCP_UNALIGN);
+    cs->exception_index = EXCP_UNALIGN;
+    cpu_loop_exit_restore(cs, retaddr);
 }
 
 bool nios2_cpu_tlb_fill(CPUState *cs, vaddr address, int size,