arch/arm/lib/testsetbit.S

   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