memchr.S 507 B

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  1. /*
  2. * linux/arch/arm/lib/memchr.S
  3. *
  4. * Copyright (C) 1995-2000 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. * ASM optimised string functions
  11. */
  12. #include <linux/linkage.h>
  13. #include <asm/assembler.h>
  14. .text
  15. .align 5
  16. ENTRY(memchr)
  17. 1: subs r2, r2, #1
  18. bmi 2f
  19. ldrb r3, [r0], #1
  20. teq r3, r1
  21. bne 1b
  22. sub r0, r0, #1
  23. 2: movne r0, #0
  24. mov pc, lr