target/nios2: Handle EXCP_UNALIGN and EXCP_UNALIGND

While some of the plumbing for misaligned data is present, in the form
of nios2_cpu_do_unaligned_access, the hook will not be called because
TARGET_ALIGNED_ONLY is not set in configs/targets/nios2-softmmu.mak.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-Id: <20220421151735.31996-35-richard.henderson@linaro.org>

target/nios2/helper.c

@@ -99,6 +99,12 @@ void nios2_cpu_do_interrupt(CPUState *cs)
         case EXCP_ILLEGAL:
             name = "ILLEGAL insn";
             break;
+        case EXCP_UNALIGN:
+            name = "Misaligned (data)";
+            break;
+        case EXCP_UNALIGND:
+            name = "Misaligned (destination)";
+            break;
         case EXCP_TRAP:
             name = "TRAP insn";
             break;
@@ -147,6 +153,8 @@ void nios2_cpu_do_interrupt(CPUState *cs)
     case EXCP_SUPERD:
     case EXCP_ILLEGAL:
     case EXCP_TRAP:
+    case EXCP_UNALIGN:
+    case EXCP_UNALIGND:
         do_exception(cpu, cpu->exception_addr, false);
         break;