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 27generic_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 34