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 | |
7 | #define BRANCH_ALWAYS 0x10680000 |
8 | #define NOP 0x01000000 |
9 | #define GEN_DO_PATCH(OLD, NEW) \ |
10 | sethi %hi(NEW), %g1; \ |
11 | or %g1, %lo(NEW), %g1; \ |
12 | sethi %hi(OLD), %g2; \ |
13 | or %g2, %lo(OLD), %g2; \ |
14 | sub %g1, %g2, %g1; \ |
15 | sethi %hi(BRANCH_ALWAYS), %g3; \ |
16 | sll %g1, 11, %g1; \ |
17 | srl %g1, 11 + 2, %g1; \ |
18 | or %g3, %lo(BRANCH_ALWAYS), %g3; \ |
19 | or %g3, %g1, %g3; \ |
20 | stw %g3, [%g2]; \ |
21 | sethi %hi(NOP), %g3; \ |
22 | or %g3, %lo(NOP), %g3; \ |
23 | stw %g3, [%g2 + 0x4]; \ |
24 | flush %g2; |
25 | |
26 | .globl generic_patch_copyops |
27 | .type generic_patch_copyops,#function |
28 | generic_patch_copyops: |
29 | GEN_DO_PATCH(memcpy, GENmemcpy) |
30 | GEN_DO_PATCH(raw_copy_from_user, GENcopy_from_user) |
31 | GEN_DO_PATCH(raw_copy_to_user, GENcopy_to_user) |
32 | retl |
33 | nop |
34 | .size generic_patch_copyops,.-generic_patch_copyops |
35 | |