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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 
#include 
#include 
 
                .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

Line No.	Rev	Author	Line
1	1275	phoenix	`/*`
2			`* This file is subject to the terms and conditions of the GNU General Public`
3			`* License. See the file "COPYING" in the main directory of this archive`
4			`* for more details.`
5			`*`
6			`* Kernel debug stuff to use the Watch registers.`
7			`* Useful to find stack overflows, dangling pointers etc.`
8			`*`
9			`* Copyright (C) 1995, 1996, 1999, 2001 by Ralf Baechle`
10			`*/`
11			`#include`
12			`#include`
13			`#include`
14
15			`.set noreorder`
16			`/*`
17			`* Parameter: a0 - physical address to watch`
18			`* a1 - set bit #1 to trap on load references`
19			`* bit #0 to trap on store references`
20			`* Results : none`
21			`*/`
22			`LEAF(__watch_set)`
23			`ori a0, 7`
24			`xori a0, 7`
25			`or a0, a1`
26			`mtc0 a0, CP0_WATCHLO`
27			`sd a0, watch_savelo`
28			`dsrl32 a0, a0, 0`
29
30			`jr ra`
31			`mtc0 zero, CP0_WATCHHI`
32			`END(__watch_set)`
33
34			`/*`
35			`* Parameter: none`
36			`* Results : none`
37			`*/`
38			`LEAF(__watch_clear)`
39			`jr ra`
40			`mtc0 zero, CP0_WATCHLO`
41			`END(__watch_clear)`
42
43			`/*`
44			`* Parameter: none`
45			`* Results : none`
46			`*/`
47			`LEAF(__watch_reenable)`
48			`ld t0, watch_savelo`
49			`jr ra`
50			`mtc0 t0, CP0_WATCHLO`
51			`END(__watch_reenable)`
52
53			`/*`
54			`* Saved value of the c0_watchlo register for watch_reenable()`
55			`*/`
56			`.local watch_savelo`
57			`.comm watch_savelo, 8, 8`

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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [arch/] [mips64/] [lib/] [watch.S] - Blame information for rev 1765