target-i386: Update BNDSTATUS for exceptions raised by BOUND

Signed-off-by: NRichard Henderson <rth@twiddle.net>

target-i386/mem_helper.c

@@ -112,6 +112,9 @@ void helper_boundw(CPUX86State *env, target_ulong a0, int v)
     high = cpu_ldsw_data_ra(env, a0 + 2, GETPC());
     v = (int16_t)v;
     if (v < low || v > high) {
+        if (env->hflags & HF_MPX_EN_MASK) {
+            env->bndcs_regs.sts = 0;
+        }
         raise_exception_ra(env, EXCP05_BOUND, GETPC());
     }
 }
@@ -123,6 +126,9 @@ void helper_boundl(CPUX86State *env, target_ulong a0, int v)
     low = cpu_ldl_data_ra(env, a0, GETPC());
     high = cpu_ldl_data_ra(env, a0 + 4, GETPC());
     if (v < low || v > high) {
+        if (env->hflags & HF_MPX_EN_MASK) {
+            env->bndcs_regs.sts = 0;
+        }
         raise_exception_ra(env, EXCP05_BOUND, GETPC());
     }
 }