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