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1da177e4 LT |
1 | /* |
2 | * linux/arch/arm/lib/testsetbit.S | |
3 | * | |
4 | * Copyright (C) 1995-1996 Russell King | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | */ | |
10 | #include <linux/linkage.h> | |
11 | #include <asm/assembler.h> | |
12 | .text | |
13 | ||
14 | ENTRY(_test_and_set_bit_be) | |
15 | eor r0, r0, #0x18 @ big endian byte ordering | |
16 | ENTRY(_test_and_set_bit_le) | |
17 | add r1, r1, r0, lsr #3 @ Get byte offset | |
18 | and r3, r0, #7 @ Get bit offset | |
19 | mov r0, #1 | |
20 | save_and_disable_irqs ip, r2 | |
21 | ldrb r2, [r1] | |
22 | tst r2, r0, lsl r3 | |
23 | orr r2, r2, r0, lsl r3 | |
24 | strb r2, [r1] | |
25 | restore_irqs ip | |
26 | moveq r0, #0 | |
27 | RETINSTR(mov,pc,lr) | |
28 | ||
29 |