/* 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(___copy_from_user, GENcopy_from_user) | |
GEN_DO_PATCH(___copy_to_user, GENcopy_to_user) | |
retl | |
nop | |
.size generic_patch_copyops,.-generic_patch_copyops |