cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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GENpatch.S (915B)

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