diff mbox series

[v5,34/48] target/nios2: Enable unaligned traps for system mode

Message ID 20220310112725.570053-35-richard.henderson@linaro.org
State Superseded
Headers show
Series target/nios2: Shadow register set, EIC and VIC | expand

Commit Message

Richard Henderson March 10, 2022, 11:27 a.m. UTC 
Unaligned traps are optional, but required with an mmu.
Turn them on always, because the fallback behaviour is not
documented (though presumably it discards low bits).

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

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 460032adc0..bf40cff779 100644
--- a/target/nios2/helper.c
+++ b/target/nios2/helper.c
@@ -264,8 +264,8 @@  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,