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rwlock_64.S

rwlock_64.S 646 B
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  1. /* Slow paths of read/write spinlocks. */
    2. 

  2. 

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

  4. #include <asm/rwlock.h>
    5. 

  5. #include <asm/alternative-asm.h>
    6. 

  6. #include <asm/dwarf2.h>
    7. 

  7. 

  8. /* rdi:	pointer to rwlock_t */
    9. 

  9. ENTRY(__write_lock_failed)
    10. 

  10. 	CFI_STARTPROC
    11. 

  11. 	LOCK_PREFIX
    12. 

  12. 	addl $RW_LOCK_BIAS,(%rdi)
    13. 

  13. 1:	rep
    14. 

  14. 	nop
    15. 

  15. 	cmpl $RW_LOCK_BIAS,(%rdi)
    16. 

  16. 	jne 1b
    17. 

  17. 	LOCK_PREFIX
    18. 

  18. 	subl $RW_LOCK_BIAS,(%rdi)
    19. 

  19. 	jnz  __write_lock_failed
    20. 

  20. 	ret
    21. 

  21. 	CFI_ENDPROC
    22. 

  22. END(__write_lock_failed)
    23. 

  23. 

  24. /* rdi:	pointer to rwlock_t */
    25. 

  25. ENTRY(__read_lock_failed)
    26. 

  26. 	CFI_STARTPROC
    27. 

  27. 	LOCK_PREFIX
    28. 

  28. 	incl (%rdi)
    29. 

  29. 1:	rep
    30. 

  30. 	nop
    31. 

  31. 	cmpl $1,(%rdi)
    32. 

  32. 	js 1b
    33. 

  33. 	LOCK_PREFIX
    34. 

  34. 	decl (%rdi)
    35. 

  35. 	js __read_lock_failed
    36. 

  36. 	ret
    37. 

  37. 	CFI_ENDPROC
    38. 

  38. END(__read_lock_failed)
    39.