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spinlock.S

spinlock.S 420 B
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  1. ;; Core of the spinlock implementation
    2. 

  2. ;;
    3. 

  3. ;; Copyright (C) 2004 Axis Communications AB.
    4. 

  4. ;;
    5. 

  5. ;; Author: Mikael Starvik
    6. 

  6. 

  7. 

  8. 	.global cris_spin_lock
    9. 

  9. 	.global cris_spin_trylock
    10. 

  10. 

  11. 	.text
    12. 

  12. 

  13. cris_spin_lock:
    14. 

  14. 	clearf	p
    15. 

  15. 1:	test.d	[$r10]
    16. 

  16. 	beq	1b
    17. 

  17. 	clearf	p
    18. 

  18. 	ax
    19. 

  19. 	clear.d [$r10]
    20. 

  20. 	bcs     1b
    21. 

  21. 	clearf	p
    22. 

  22. 	ret
    23. 

  23. 	nop
    24. 

  24. 

  25. cris_spin_trylock:
    26. 

  26. 	clearf	p
    27. 

  27. 1:	move.d	[$r10], $r11
    28. 

  28. 	ax
    29. 

  29. 	clear.d [$r10]
    30. 

  30.         bcs	1b
    31. 

  31.         clearf	p
    32. 

  32. 	ret
    33. 

  33. 	move.d	$r11,$r10
    34.