35 lines
915 B
ArmAsm
35 lines
915 B
ArmAsm
|
/* SPDX-License-Identifier: GPL-2.0 */
|
||
|
|
/* GENpatch.S: Patch Ultra-I routines with generic variant.
|
||
|
|
*
|
||
|
|
* Copyright (C) 2007 David S. Miller <davem@davemloft.net>
|
||
|
|
*/
|
||
|
|
|
||
|
|
#define BRANCH_ALWAYS 0x10680000
|
||
|
|
#define NOP 0x01000000
|
||
|
|
#define GEN_DO_PATCH(OLD, NEW) \
|
||
|
|
sethi %hi(NEW), %g1; \
|
||
|
|
or %g1, %lo(NEW), %g1; \
|
||
|
|
sethi %hi(OLD), %g2; \
|
||
|
|
or %g2, %lo(OLD), %g2; \
|
||
|
|
sub %g1, %g2, %g1; \
|
||
|
|
sethi %hi(BRANCH_ALWAYS), %g3; \
|
||
|
|
sll %g1, 11, %g1; \
|
||
|
|
srl %g1, 11 + 2, %g1; \
|
||
|
|
or %g3, %lo(BRANCH_ALWAYS), %g3; \
|
||
|
|
or %g3, %g1, %g3; \
|
||
|
|
stw %g3, [%g2]; \
|
||
|
|
sethi %hi(NOP), %g3; \
|
||
|
|
or %g3, %lo(NOP), %g3; \
|
||
|
|
stw %g3, [%g2 + 0x4]; \
|
||
|
|
flush %g2;
|
||
|
|
|
||
|
|
.globl generic_patch_copyops
|
||
|
|
.type generic_patch_copyops,#function
|
||
|
|
generic_patch_copyops:
|
||
|
|
GEN_DO_PATCH(memcpy, GENmemcpy)
|
||
|
|
GEN_DO_PATCH(raw_copy_from_user, GENcopy_from_user)
|
||
|
|
GEN_DO_PATCH(raw_copy_to_user, GENcopy_to_user)
|
||
|
|
retl
|
||
|
|
nop
|
||
|
|
.size generic_patch_copyops,.-generic_patch_copyops
|