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/*
 * 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, 2001 by Ralf Baechle
 */
#include <asm/asm.h>
#include <asm/mipsregs.h>
#include <asm/regdef.h>

                .set    noreorder
/*
 * Parameter: a0 - physical address to watch
 *            a1 - set bit #1 to trap on load references
 *                     bit #0 to trap on store references
 * Results  : none
 */
                LEAF(__watch_set)
                ori     a0, 7
                xori    a0, 7
                or      a0, a1
                mtc0    a0, CP0_WATCHLO
                sd      a0, watch_savelo
                dsrl32  a0, a0, 0

                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)
                ld      t0, watch_savelo
                jr      ra
                 mtc0   t0, CP0_WATCHLO
                END(__watch_reenable)

/*
 * Saved value of the c0_watchlo register for watch_reenable()
 */
                .local  watch_savelo
                .comm   watch_savelo, 8, 8