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34 lines
915 B
34 lines
915 B
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* 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(raw_copy_from_user, GENcopy_from_user) |
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GEN_DO_PATCH(raw_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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