Upper 32 bits of XER should read as 0s

From the architecture:

  bits 0:31 and 35:43 are treated as reserved and return 0s when read
  using mfxer

Signed-off-by: Anton Blanchard <anton@linux.ibm.com>

diff --git a/execute1.vhdl b/execute1.vhdl
index 421bccb7c901306179a3cfb320b8543b723f9526..4986c71d13ff5749862e7d499a17a574f697363b 100644 (file)
--- a/execute1.vhdl
+++ b/execute1.vhdl
@@ -401,6 +401,8 @@ begin
                if is_fast_spr(e_in.read_reg1) then
                    result := e_in.read_data1;
                    if decode_spr_num(e_in.insn) = SPR_XER then
+                       -- bits 0:31 and 35:43 are treated as reserved and return 0s when read using mfxer
+                       result(63 downto 32) := (others => '0');
                        result(63-32) := v.e.xerc.so;
                        result(63-33) := v.e.xerc.ov;
                        result(63-34) := v.e.xerc.ca;