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GENpatch.S

GENpatch.S 874 B
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  1. /* GENpatch.S: Patch Ultra-I routines with generic variant.
    2. 

  2.  *
    3. 

  3.  * Copyright (C) 2007 David S. Miller <davem@davemloft.net>
    4. 

  4.  */
    5. 

  5. 

  6. #define BRANCH_ALWAYS	0x10680000
    7. 

  7. #define NOP		0x01000000
    8. 

  8. #define GEN_DO_PATCH(OLD, NEW)	\
    9. 

  9. 	sethi	%hi(NEW), %g1; \
    10. 

  10. 	or	%g1, %lo(NEW), %g1; \
    11. 

  11. 	sethi	%hi(OLD), %g2; \
    12. 

  12. 	or	%g2, %lo(OLD), %g2; \
    13. 

  13. 	sub	%g1, %g2, %g1; \
    14. 

  14. 	sethi	%hi(BRANCH_ALWAYS), %g3; \
    15. 

  15. 	sll	%g1, 11, %g1; \
    16. 

  16. 	srl	%g1, 11 + 2, %g1; \
    17. 

  17. 	or	%g3, %lo(BRANCH_ALWAYS), %g3; \
    18. 

  18. 	or	%g3, %g1, %g3; \
    19. 

  19. 	stw	%g3, [%g2]; \
    20. 

  20. 	sethi	%hi(NOP), %g3; \
    21. 

  21. 	or	%g3, %lo(NOP), %g3; \
    22. 

  22. 	stw	%g3, [%g2 + 0x4]; \
    23. 

  23. 	flush	%g2;
    24. 

  24. 

  25. 	.globl	generic_patch_copyops
    26. 

  26. 	.type	generic_patch_copyops,#function
    27. 

  27. generic_patch_copyops:
    28. 

  28. 	GEN_DO_PATCH(memcpy, GENmemcpy)
    29. 

  29. 	GEN_DO_PATCH(___copy_from_user, GENcopy_from_user)
    30. 

  30. 	GEN_DO_PATCH(___copy_to_user, GENcopy_to_user)
    31. 

  31. 	retl
    32. 

  32. 	 nop
    33. 

  33. 	.size	generic_patch_copyops,.-generic_patch_copyops
    34. 

  34.