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- /* GENpatch.S: Patch Ultra-I routines with generic variant.
- *
- * Copyright (C) 2007 David S. Miller <davem@davemloft.net>
- */
- #define BRANCH_ALWAYS 0x10680000
- #define NOP 0x01000000
- #define GEN_DO_PATCH(OLD, NEW) \
- sethi %hi(NEW), %g1; \
- or %g1, %lo(NEW), %g1; \
- sethi %hi(OLD), %g2; \
- or %g2, %lo(OLD), %g2; \
- sub %g1, %g2, %g1; \
- sethi %hi(BRANCH_ALWAYS), %g3; \
- sll %g1, 11, %g1; \
- srl %g1, 11 + 2, %g1; \
- or %g3, %lo(BRANCH_ALWAYS), %g3; \
- or %g3, %g1, %g3; \
- stw %g3, [%g2]; \
- sethi %hi(NOP), %g3; \
- or %g3, %lo(NOP), %g3; \
- stw %g3, [%g2 + 0x4]; \
- flush %g2;
- .globl generic_patch_copyops
- .type generic_patch_copyops,#function
- generic_patch_copyops:
- GEN_DO_PATCH(memcpy, GENmemcpy)
- GEN_DO_PATCH(___copy_from_user, GENcopy_from_user)
- GEN_DO_PATCH(___copy_to_user, GENcopy_to_user)
- retl
- nop
- .size generic_patch_copyops,.-generic_patch_copyops
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