1 files changed, 20 insertions, 7 deletions

diff --git a/sim/bfin/dv-bfin_eppi.c b/sim/bfin/dv-bfin_eppi.c
index 5999568..5ca2a9c 100644
--- a/sim/bfin/dv-bfin_eppi.c
+++ b/sim/bfin/dv-bfin_eppi.c
@@ -90,6 +90,10 @@ bfin_eppi_io_write_buffer (struct hw *me, const void *source,
   bu32 *value32p;
   void *valuep;
 
+  /* Invalid access mode is higher priority than missing register.  */
+  if (!dv_bfin_mmr_require_16_32 (me, addr, nr_bytes, true))
+    return 0;
+
   if (nr_bytes == 4)
     value = dv_load_4 (source);
   else
@@ -105,7 +109,8 @@ bfin_eppi_io_write_buffer (struct hw *me, const void *source,
   switch (mmr_off)
     {
     case mmr_offset(status):
-      dv_bfin_mmr_require_16 (me, addr, nr_bytes, true);
+      if (!dv_bfin_mmr_require_16 (me, addr, nr_bytes, true))
+	return 0;
       dv_w1c_2 (value16p, value, 0x1ff);
       break;
     case mmr_offset(hcount):
@@ -115,7 +120,8 @@ bfin_eppi_io_write_buffer (struct hw *me, const void *source,
     case mmr_offset(frame):
     case mmr_offset(line):
     case mmr_offset(clkdiv):
-      dv_bfin_mmr_require_16 (me, addr, nr_bytes, true);
+      if (!dv_bfin_mmr_require_16 (me, addr, nr_bytes, true))
+	return 0;
       *value16p = value;
       break;
     case mmr_offset(control):
@@ -128,12 +134,13 @@ bfin_eppi_io_write_buffer (struct hw *me, const void *source,
     case mmr_offset(fs2p_lavf):
     case mmr_offset(clip):
     case mmr_offset(err):
-      dv_bfin_mmr_require_32 (me, addr, nr_bytes, true);
+      if (!dv_bfin_mmr_require_32 (me, addr, nr_bytes, true))
+	return 0;
       *value32p = value;
       break;
     default:
       dv_bfin_mmr_invalid (me, addr, nr_bytes, true);
-      break;
+      return 0;
     }
 
   return nr_bytes;
@@ -149,6 +156,10 @@ bfin_eppi_io_read_buffer (struct hw *me, void *dest,
   bu32 *value32p;
   void *valuep;
 
+  /* Invalid access mode is higher priority than missing register.  */
+  if (!dv_bfin_mmr_require_16_32 (me, addr, nr_bytes, true))
+    return 0;
+
   mmr_off = addr - eppi->base;
   valuep = (void *)((unsigned long)eppi + mmr_base() + mmr_off);
   value16p = valuep;
@@ -166,7 +177,8 @@ bfin_eppi_io_read_buffer (struct hw *me, void *dest,
     case mmr_offset(frame):
     case mmr_offset(line):
     case mmr_offset(clkdiv):
-      dv_bfin_mmr_require_16 (me, addr, nr_bytes, false);
+      if (!dv_bfin_mmr_require_16 (me, addr, nr_bytes, false))
+	return 0;
       dv_store_2 (dest, *value16p);
       break;
     case mmr_offset(control):
@@ -176,12 +188,13 @@ bfin_eppi_io_read_buffer (struct hw *me, void *dest,
     case mmr_offset(fs2p_lavf):
     case mmr_offset(clip):
     case mmr_offset(err):
-      dv_bfin_mmr_require_32 (me, addr, nr_bytes, false);
+      if (!dv_bfin_mmr_require_32 (me, addr, nr_bytes, false))
+	return 0;
       dv_store_4 (dest, *value32p);
       break;
     default:
       dv_bfin_mmr_invalid (me, addr, nr_bytes, false);
-      break;
+      return 0;
     }
 
   return nr_bytes;