GENpatch.S 915 B

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  1. /* SPDX-License-Identifier: GPL-2.0 */
  2. /* GENpatch.S: Patch Ultra-I routines with generic variant.
  3. *
  4. * Copyright (C) 2007 David S. Miller <davem@davemloft.net>
  5. */
  6. #define BRANCH_ALWAYS 0x10680000
  7. #define NOP 0x01000000
  8. #define GEN_DO_PATCH(OLD, NEW) \
  9. sethi %hi(NEW), %g1; \
  10. or %g1, %lo(NEW), %g1; \
  11. sethi %hi(OLD), %g2; \
  12. or %g2, %lo(OLD), %g2; \
  13. sub %g1, %g2, %g1; \
  14. sethi %hi(BRANCH_ALWAYS), %g3; \
  15. sll %g1, 11, %g1; \
  16. srl %g1, 11 + 2, %g1; \
  17. or %g3, %lo(BRANCH_ALWAYS), %g3; \
  18. or %g3, %g1, %g3; \
  19. stw %g3, [%g2]; \
  20. sethi %hi(NOP), %g3; \
  21. or %g3, %lo(NOP), %g3; \
  22. stw %g3, [%g2 + 0x4]; \
  23. flush %g2;
  24. .globl generic_patch_copyops
  25. .type generic_patch_copyops,#function
  26. generic_patch_copyops:
  27. GEN_DO_PATCH(memcpy, GENmemcpy)
  28. GEN_DO_PATCH(raw_copy_from_user, GENcopy_from_user)
  29. GEN_DO_PATCH(raw_copy_to_user, GENcopy_to_user)
  30. retl
  31. nop
  32. .size generic_patch_copyops,.-generic_patch_copyops