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rwlock.S

rwlock.S 783 B
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  1. /* Slow paths of read/write spinlocks. */
    2. 

  2. 

  3. #include <linux/linkage.h>
    4. 

  4. #include <asm/alternative-asm.h>
    5. 

  5. #include <asm/frame.h>
    6. 

  6. #include <asm/rwlock.h>
    7. 

  7. 

  8. #ifdef CONFIG_X86_32
    9. 

  9. # define __lock_ptr eax
    10. 

  10. #else
    11. 

  11. # define __lock_ptr rdi
    12. 

  12. #endif
    13. 

  13. 

  14. ENTRY(__write_lock_failed)
    15. 

  15. 	CFI_STARTPROC
    16. 

  16. 	FRAME
    17. 

  17. 0:	LOCK_PREFIX
    18. 

  18. 	WRITE_LOCK_ADD($RW_LOCK_BIAS) (%__lock_ptr)
    19. 

  19. 1:	rep; nop
    20. 

  20. 	cmpl	$WRITE_LOCK_CMP, (%__lock_ptr)
    21. 

  21. 	jne	1b
    22. 

  22. 	LOCK_PREFIX
    23. 

  23. 	WRITE_LOCK_SUB($RW_LOCK_BIAS) (%__lock_ptr)
    24. 

  24. 	jnz	0b
    25. 

  25. 	ENDFRAME
    26. 

  26. 	ret
    27. 

  27. 	CFI_ENDPROC
    28. 

  28. END(__write_lock_failed)
    29. 

  29. 

  30. ENTRY(__read_lock_failed)
    31. 

  31. 	CFI_STARTPROC
    32. 

  32. 	FRAME
    33. 

  33. 0:	LOCK_PREFIX
    34. 

  34. 	READ_LOCK_SIZE(inc) (%__lock_ptr)
    35. 

  35. 1:	rep; nop
    36. 

  36. 	READ_LOCK_SIZE(cmp) $1, (%__lock_ptr)
    37. 

  37. 	js	1b
    38. 

  38. 	LOCK_PREFIX
    39. 

  39. 	READ_LOCK_SIZE(dec) (%__lock_ptr)
    40. 

  40. 	js	0b
    41. 

  41. 	ENDFRAME
    42. 

  42. 	ret
    43. 

  43. 	CFI_ENDPROC
    44. 

  44. END(__read_lock_failed)
    45. 

  45.