/arch/avr32/lib/io-readsb.S

https://bitbucket.org/thekraven/iscream_thunderc-2.6.35 · Assembly · 49 lines · 32 code · 9 blank · 8 comment · 0 complexity · fcd36b21d4e6f5164766906f5b29803f MD5 · raw file 

    

  1. /*
    2. 

  2.  * Copyright (C) 2004-2006 Atmel Corporation
    3. 

  3.  *
    4. 

  4.  * This program is free software; you can redistribute it and/or modify
    5. 

  5.  * it under the terms of the GNU General Public License version 2 as
    6. 

  6.  * published by the Free Software Foundation.
    7. 

  7.  */
    8. 

  8. 

  9. 	.text
    10. 

  10. .Lnot_word_aligned:
    11. 

  11. 1:	ld.ub	r8, r12[0]
    12. 

  12. 	sub	r10, 1
    13. 

  13. 	st.b	r11++, r8
    14. 

  14. 	reteq	r12
    15. 

  15. 	tst	r11, r9
    16. 

  16. 	brne	1b
    17. 

  17. 

  18. 	/* fall through */
    19. 

  19. 

  20. 	.global	__raw_readsb
    21. 

  21. 	.type	__raw_readsb,@function
    22. 

  22. __raw_readsb:
    23. 

  23. 	cp.w	r10, 0
    24. 

  24. 	mov	r9, 3
    25. 

  25. 	reteq	r12
    26. 

  26. 

  27. 	tst	r11, r9
    28. 

  28. 	brne	.Lnot_word_aligned
    29. 

  29. 

  30. 	sub	r10, 4
    31. 

  31. 	brlt	2f
    32. 

  32. 

  33. 1:	ldins.b	r8:t, r12[0]
    34. 

  34. 	ldins.b	r8:u, r12[0]
    35. 

  35. 	ldins.b	r8:l, r12[0]
    36. 

  36. 	ldins.b r8:b, r12[0]
    37. 

  37. 	st.w	r11++, r8
    38. 

  38. 	sub	r10, 4
    39. 

  39. 	brge	1b
    40. 

  40. 

  41. 2:	sub	r10, -4
    42. 

  42. 	reteq	r12
    43. 

  43. 

  44. 3:	ld.ub	r8, r12[0]
    45. 

  45. 	sub	r10, 1
    46. 

  46. 	st.b	r11++, r8
    47. 

  47. 	brne	3b
    48. 

  48. 

  49. 	retal	r12
    50.