File: testchangebit.S

package info (click to toggle)
kernel-source-2.4.14 2.4.14-1
  • links: PTS
  • area: main
  • in suites: woody
  • size: 139,160 kB
  • ctags: 428,423
  • sloc: ansic: 2,435,554; asm: 141,119; makefile: 8,258; sh: 3,099; perl: 2,561; yacc: 1,177; cpp: 755; tcl: 577; lex: 352; awk: 251; lisp: 218; sed: 72
file content (27 lines) | stat: -rw-r--r-- 605 bytes parent folder | download | duplicates (9) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
 
/*
 *  linux/arch/arm/lib/testchangebit.S
 *
 *  Copyright (C) 1995-1996 Russell King
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#include <linux/linkage.h>
#include <asm/assembler.h>
                .text

ENTRY(test_and_change_bit)
		add	r1, r1, r0, lsr #3
		and	r3, r0, #7
		mov	r0, #1
		save_and_disable_irqs ip, r2
		ldrb	r2, [r1]
		tst	r2, r0, lsl r3
		eor	r2, r2, r0, lsl r3
		strb	r2, [r1]
		restore_irqs ip
		moveq	r0, #0
		RETINSTR(mov,pc,lr)