[src/trunk]: src/sys/arch/sh3/sh3 While here, shave off few bytes and few cyc...

[uwe <uwe%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/e4c1a6e1939e
branches:  trunk
changeset: 588100:e4c1a6e1939e
user:      uwe <uwe%NetBSD.org@localhost>
date:      Wed Feb 08 00:32:06 2006 +0000

description:
While here, shave off few bytes and few cycles off of the sh3_vector_tlbmiss.

Since the registers we use are at the very end of address space, we
can load their addresses as small immediate negative constants instead
of loading them from memory.

diffstat:

 sys/arch/sh3/sh3/exception_vector.S |  16 ++++++----------
 1 files changed, 6 insertions(+), 10 deletions(-)

diffs (59 lines):

diff -r 1a26a39b4f8f -r e4c1a6e1939e sys/arch/sh3/sh3/exception_vector.S
--- a/sys/arch/sh3/sh3/exception_vector.S       Tue Feb 07 23:56:20 2006 +0000
+++ b/sys/arch/sh3/sh3/exception_vector.S       Wed Feb 08 00:32:06 2006 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: exception_vector.S,v 1.16 2006/02/07 23:56:20 uwe Exp $        */
+/*     $NetBSD: exception_vector.S,v 1.17 2006/02/08 00:32:06 uwe Exp $        */
 
 /*-
  * Copyright (c) 2002 The NetBSD Foundation, Inc.
@@ -45,7 +45,7 @@
 #include <sh3/mmu_sh3.h>
 #include <sh3/mmu_sh4.h>
 
-__KERNEL_RCSID(0, "$NetBSD: exception_vector.S,v 1.16 2006/02/07 23:56:20 uwe Exp $")
+__KERNEL_RCSID(0, "$NetBSD: exception_vector.S,v 1.17 2006/02/08 00:32:06 uwe Exp $")
 
 
 /*
@@ -147,7 +147,7 @@
  */
 NENTRY(sh3_vector_tlbmiss)
        __EXCEPTION_ENTRY
-       mov.l   _L.TEA3, r0
+       mov     #(SH3_TEA & 0xff), r0
        mov.l   @r0,    r6      /* 3rd arg: va = TEA */
 #if !defined(P1_STACK)
        /* Load kernel stack */
@@ -169,9 +169,9 @@
        bra     6f
         nop
 5:     mov.l   @r1,    r2      /* md_upte.data: u-area PTE */
-       mov.l   _L.PTEL, r1
+       mov     #(SH3_PTEL & 0xff), r1
        mov.l   r2,     @r1
-       mov.l   _L.PTEH, r1
+       mov     #(SH3_PTEH & 0xff), r1
        mov.l   @r1,    r2
        mov.l   __L.VPN_MASK, r0
        and     r2,     r0
@@ -181,7 +181,7 @@
        bra     3f
         nop
 #endif /* !P1_STACK */
-6:     mov.l   _L.EXPEVT3, r0
+6:     mov     #(SH3_EXPEVT & 0xff), r0
        mov.l   @r0,    r0
        mov.l   r0,     @(TF_EXPEVT, r14) /* trapframe->tf_expevt = EXPEVT */
        mov.l   2f,     r0
@@ -195,10 +195,6 @@
        .align  2
 2:             .long   _C_LABEL(curlwp)
 1:             .long   _C_LABEL(tlb_exception)
-_L.EXPEVT3:    .long   SH3_EXPEVT
-_L.TEA3:       .long   SH3_TEA
-_L.PTEL:       .long   SH3_PTEL
-_L.PTEH:       .long   SH3_PTEH
 __L.VPN_MASK:  .long   0xfffff000
 _L.CURUPTE:    .long   _C_LABEL(curupte)