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Tip revision: 1def630a6a49dda5bc89dfbd86656293640456f0 authored by Linus Torvalds on 06 June 2006, 00:57:02 UTC
Linux 2.6.17-rc6
Linux 2.6.17-rc6
Tip revision: 1def630
watch.S
/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Kernel debug stuff to use the Watch registers.
* Useful to find stack overflows, dangling pointers etc.
*
* Copyright (C) 1995, 1996, 1999 by Ralf Baechle
*/
#include <asm/asm.h>
#include <asm/mipsregs.h>
#include <asm/regdef.h>
.set noreorder
/*
* Parameter: a0 - logic address to watch
* Currently only KSEG0 addresses are allowed!
* a1 - set bit #1 to trap on load references
* bit #0 to trap on store references
* Results : none
*/
LEAF(__watch_set)
li t0, 0x80000000
subu a0, t0
ori a0, 7
xori a0, 7
or a0, a1
mtc0 a0, CP0_WATCHLO
sw a0, watch_savelo
jr ra
mtc0 zero, CP0_WATCHHI
END(__watch_set)
/*
* Parameter: none
* Results : none
*/
LEAF(__watch_clear)
jr ra
mtc0 zero, CP0_WATCHLO
END(__watch_clear)
/*
* Parameter: none
* Results : none
*/
LEAF(__watch_reenable)
lw t0, watch_savelo
jr ra
mtc0 t0, CP0_WATCHLO
END(__watch_reenable)
/*
* Saved value of the c0_watchlo register for watch_reenable()
*/
.data
watch_savelo: .word 0
.text