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

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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.
This commit is contained in:
uwe 2006-02-08 00:32:06 +00:00
parent 9621f44368
commit 33c4e018e2
1 changed files with 6 additions and 10 deletions
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16
sys/arch/sh3/sh3/exception_vector.S
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@ -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 @@ VECTOR_END_MARKER(sh_vector_generic_end)
*/
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 @@ NENTRY(sh3_vector_tlbmiss)
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 @@ NENTRY(sh3_vector_tlbmiss)
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 @@ NENTRY(sh3_vector_tlbmiss)
.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)