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6c70b6fc DM |
1 | /* GENpatch.S: Patch Ultra-I routines with generic variant. |
2 | * | |
3 | * Copyright (C) 2007 David S. Miller <davem@davemloft.net> | |
4 | */ | |
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 | ||
25 | .globl generic_patch_copyops | |
26 | .type generic_patch_copyops,#function | |
27 | generic_patch_copyops: | |
28 | GEN_DO_PATCH(memcpy, GENmemcpy) | |
29 | GEN_DO_PATCH(___copy_from_user, GENcopy_from_user) | |
30 | GEN_DO_PATCH(___copy_to_user, GENcopy_to_user) | |
31 | retl | |
32 | nop | |
33 | .size generic_patch_copyops,.-generic_patch_copyops |