christophe leroy [off-list ref] wrote on 2014/09/18 21:11:01:

=20
=20
Le 18/09/2014 20:12, Joakim Tjernlund a =E9crit :

quoted

leroy christophe [off-list ref] wrote on 2014/09/18=20

18:42:14:

quoted

quoted

Le 18/09/2014 17:15, Joakim Tjernlund a =E9crit :

quoted

Christophe Leroy [off-list ref] wrote on 2014/09/17

18:36:57:

quoted

quoted

quoted

Exception InstructionAccess does not exist on MPC8xx. No need to

branch

quoted

quoted

there from somewhere else.

quoted

Handling can be done directly in InstructionTLBError Exception.

Signed-off-by: Christophe Leroy <redacted>

       . =3D 0x1200
   DataStoreTLBMiss:

@@ -477,7 +475,11 @@ DataStoreTLBMiss:
    */
       . =3D 0x1300
   InstructionTLBError:
-    b    InstructionAccess
+    EXCEPTION=5FPROLOG
+    mr    r4,r12
+    mr    r5,r9
+    /* 0x400 is InstructionAccess exception, needed by=20

bad=5Fpage=5Ffault()

quoted

*/

quoted

+    EXC=5FXFER=5FLITE(0x400, handle=5Fpage=5Ffault)

You should have the code in TLBMiss and have the TLBError branch there =

as

quoted

that is the common case.

As far as I remember, I tried it already but we don't have enough space=20
in TLBmiss for that. We can only have 40 instructions.

Do your other optimizations first, then you might have space :)

 Jocke