1 /* SPDX-License-Identifier: GPL-2.0 */ 1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* GENpatch.S: Patch Ultra-I routines with gen 2 /* GENpatch.S: Patch Ultra-I routines with generic variant.
3 * 3 *
4 * Copyright (C) 2007 David S. Miller <davem@da 4 * Copyright (C) 2007 David S. Miller <davem@davemloft.net>
5 */ 5 */
6 6
7 #define BRANCH_ALWAYS 0x10680000 7 #define BRANCH_ALWAYS 0x10680000
8 #define NOP 0x01000000 8 #define NOP 0x01000000
9 #define GEN_DO_PATCH(OLD, NEW) \ 9 #define GEN_DO_PATCH(OLD, NEW) \
10 sethi %hi(NEW), %g1; \ 10 sethi %hi(NEW), %g1; \
11 or %g1, %lo(NEW), %g1; \ 11 or %g1, %lo(NEW), %g1; \
12 sethi %hi(OLD), %g2; \ 12 sethi %hi(OLD), %g2; \
13 or %g2, %lo(OLD), %g2; \ 13 or %g2, %lo(OLD), %g2; \
14 sub %g1, %g2, %g1; \ 14 sub %g1, %g2, %g1; \
15 sethi %hi(BRANCH_ALWAYS), %g3; \ 15 sethi %hi(BRANCH_ALWAYS), %g3; \
16 sll %g1, 11, %g1; \ 16 sll %g1, 11, %g1; \
17 srl %g1, 11 + 2, %g1; \ 17 srl %g1, 11 + 2, %g1; \
18 or %g3, %lo(BRANCH_ALWAYS), %g3; 18 or %g3, %lo(BRANCH_ALWAYS), %g3; \
19 or %g3, %g1, %g3; \ 19 or %g3, %g1, %g3; \
20 stw %g3, [%g2]; \ 20 stw %g3, [%g2]; \
21 sethi %hi(NOP), %g3; \ 21 sethi %hi(NOP), %g3; \
22 or %g3, %lo(NOP), %g3; \ 22 or %g3, %lo(NOP), %g3; \
23 stw %g3, [%g2 + 0x4]; \ 23 stw %g3, [%g2 + 0x4]; \
24 flush %g2; 24 flush %g2;
25 25
26 .globl generic_patch_copyops 26 .globl generic_patch_copyops
27 .type generic_patch_copyops,#functio 27 .type generic_patch_copyops,#function
28 generic_patch_copyops: 28 generic_patch_copyops:
29 GEN_DO_PATCH(memcpy, GENmemcpy) 29 GEN_DO_PATCH(memcpy, GENmemcpy)
30 GEN_DO_PATCH(raw_copy_from_user, GENco 30 GEN_DO_PATCH(raw_copy_from_user, GENcopy_from_user)
31 GEN_DO_PATCH(raw_copy_to_user, GENcopy 31 GEN_DO_PATCH(raw_copy_to_user, GENcopy_to_user)
32 retl 32 retl
33 nop 33 nop
34 .size generic_patch_copyops,.-generi 34 .size generic_patch_copyops,.-generic_patch_copyops
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