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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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1234567891011121314151617181920212223242526272829303132333435/* 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,#functiongeneric_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