/arch/sh/lib64/strlen.S

https://bitbucket.org/ndreys/linux-sunxi · Assembly · 33 lines · 17 code · 6 blank · 10 comment · 0 complexity · 210df6f3a44e31668e0ca5e14cde2083 MD5 · raw file 

    

  1. /*
    2. 

  2.  * Simplistic strlen() implementation for SHmedia.
    3. 

  3.  *
    4. 

  4.  * Copyright (C) 2003  Paul Mundt <lethal@linux-sh.org>
    5. 

  5.  */
    6. 

  6. 

  7. 	.section .text..SHmedia32,"ax"
    8. 

  8. 	.globl	strlen
    9. 

  9. 	.type	strlen,@function
    10. 

  10. 

  11. 	.balign 16
    12. 

  12. strlen:
    13. 

  13. 	ptabs	r18, tr4
    14. 

  14. 

  15. 	/*
    16. 

  16. 	 * Note: We could easily deal with the NULL case here with a simple
    17. 

  17. 	 * sanity check, though it seems that the behavior we want is to fault
    18. 

  18. 	 * in the event that r2 == NULL, so we don't bother.
    19. 

  19. 	 */
    20. 

  20. /*	beqi    r2, 0, tr4 */	! Sanity check
    21. 

  21. 

  22. 	movi	-1, r0
    23. 

  23. 	pta/l	loop, tr0
    24. 

  24. loop:
    25. 

  25. 	ld.b	r2, 0, r1
    26. 

  26. 	addi	r2, 1, r2
    27. 

  27. 	addi	r0, 1, r0
    28. 

  28. 	bnei/l	r1, 0, tr0
    29. 

  29. 

  30. 	or	r0, r63, r2
    31. 

  31. 	blink	tr4, r63
    32. 

  32. 

  33. 	.size	strlen,.-strlen
    34.