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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NG4patch.S (1664B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2/* NG4patch.S: Patch Ultra-I routines with Niagara-4 variant.
      3 *
      4 * Copyright (C) 2012 David S. Miller <davem@davemloft.net>
      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
     28	.globl	niagara4_patch_copyops
     29	.type	niagara4_patch_copyops,#function
     30niagara4_patch_copyops:
     31	NG_DO_PATCH(memcpy, NG4memcpy)
     32	NG_DO_PATCH(raw_copy_from_user, NG4copy_from_user)
     33	NG_DO_PATCH(raw_copy_to_user, NG4copy_to_user)
     34	retl
     35	 nop
     36	.size	niagara4_patch_copyops,.-niagara4_patch_copyops
     37
     38	.globl	niagara4_patch_bzero
     39	.type	niagara4_patch_bzero,#function
     40niagara4_patch_bzero:
     41	NG_DO_PATCH(memset, NG4memset)
     42	NG_DO_PATCH(__bzero, NG4bzero)
     43	NG_DO_PATCH(__clear_user, NGclear_user)
     44	NG_DO_PATCH(tsb_init, NGtsb_init)
     45	retl
     46	 nop
     47	.size	niagara4_patch_bzero,.-niagara4_patch_bzero
     48
     49	.globl	niagara4_patch_pageops
     50	.type	niagara4_patch_pageops,#function
     51niagara4_patch_pageops:
     52	NG_DO_PATCH(copy_user_page, NG4copy_user_page)
     53	NG_DO_PATCH(_clear_page, NG4clear_page)
     54	NG_DO_PATCH(clear_user_page, NG4clear_user_page)
     55	retl
     56	 nop
     57	.size	niagara4_patch_pageops,.-niagara4_patch_pageops
     58
     59ENTRY(niagara4_patch_fls)
     60	NG_DO_PATCH(fls, NG4fls)
     61	NG_DO_PATCH(__fls, __NG4fls)
     62	retl
     63	 nop
     64ENDPROC(niagara4_patch_fls)