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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M7patch.S (1211B)

      1/*
      2 * M7patch.S: Patch generic routines with M7 variant.
      3 *
      4 * Copyright (c) 2016, Oracle and/or its affiliates.  All rights reserved.
      5 */
      6
      7#include <linux/linkage.h>
      8
      9#define BRANCH_ALWAYS	0x10680000
     10#define NOP		0x01000000
     11#define NG_DO_PATCH(OLD, NEW)	\
     12	sethi	%hi(NEW), %g1; \
     13	or	%g1, %lo(NEW), %g1; \
     14	sethi	%hi(OLD), %g2; \
     15	or	%g2, %lo(OLD), %g2; \
     16	sub	%g1, %g2, %g1; \
     17	sethi	%hi(BRANCH_ALWAYS), %g3; \
     18	sll	%g1, 11, %g1; \
     19	srl	%g1, 11 + 2, %g1; \
     20	or	%g3, %lo(BRANCH_ALWAYS), %g3; \
     21	or	%g3, %g1, %g3; \
     22	stw	%g3, [%g2]; \
     23	sethi	%hi(NOP), %g3; \
     24	or	%g3, %lo(NOP), %g3; \
     25	stw	%g3, [%g2 + 0x4]; \
     26	flush	%g2;
     27
     28ENTRY(m7_patch_copyops)
     29	NG_DO_PATCH(memcpy, M7memcpy)
     30	NG_DO_PATCH(raw_copy_from_user, M7copy_from_user)
     31	NG_DO_PATCH(raw_copy_to_user, M7copy_to_user)
     32	retl
     33	 nop
     34ENDPROC(m7_patch_copyops)
     35
     36ENTRY(m7_patch_bzero)
     37	NG_DO_PATCH(memset, M7memset)
     38	NG_DO_PATCH(__bzero, M7bzero)
     39	NG_DO_PATCH(__clear_user, NGclear_user)
     40	NG_DO_PATCH(tsb_init, NGtsb_init)
     41	retl
     42	 nop
     43ENDPROC(m7_patch_bzero)
     44
     45ENTRY(m7_patch_pageops)
     46	NG_DO_PATCH(copy_user_page, NG4copy_user_page)
     47	NG_DO_PATCH(_clear_page, M7clear_page)
     48	NG_DO_PATCH(clear_user_page, M7clear_user_page)
     49	retl
     50	 nop
     51ENDPROC(m7_patch_pageops)