diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 79f0075965..926ee207fa 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,7 @@
+2018-01-18  Yao Qi  <yao.qi@linaro.org>
+
+	* ppc-linux-tdep.c (ppu2spu_prev_register): Call cooked_read.
+
 2018-01-17  Sergio Durigan Junior  <sergiodj@redhat.com>
 
 	* compile/compile.c (compile_to_object): Convert "triplet_rx"
diff --git a/gdb/ppc-linux-tdep.c b/gdb/ppc-linux-tdep.c
index 286c02a26d..bbe9e894eb 100644
--- a/gdb/ppc-linux-tdep.c
+++ b/gdb/ppc-linux-tdep.c
@@ -1269,11 +1269,7 @@ ppu2spu_prev_register (struct frame_info *this_frame,
 
   buf = (gdb_byte *) alloca (register_size (gdbarch, regnum));
 
-  if (regnum < gdbarch_num_regs (gdbarch))
-    regcache_raw_read (cache->regcache, regnum, buf);
-  else
-    gdbarch_pseudo_register_read (gdbarch, cache->regcache, regnum, buf);
-
+  cache->regcache->cooked_read (regnum, buf);
   return frame_unwind_got_bytes (this_frame, regnum, buf);
 }