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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GENpage.S (1724B)


      1/* SPDX-License-Identifier: GPL-2.0 */
      2/* GENpage.S: Generic clear and copy page.
      3 *
      4 * Copyright (C) 2007 (davem@davemloft.net)
      5 */
      6#include <asm/page.h>
      7
      8	.text
      9	.align	32
     10
     11GENcopy_user_page:
     12	set	PAGE_SIZE, %g7
     131:	ldx	[%o1 + 0x00], %o2
     14	ldx	[%o1 + 0x08], %o3
     15	ldx	[%o1 + 0x10], %o4
     16	ldx	[%o1 + 0x18], %o5
     17	stx	%o2, [%o0 + 0x00]
     18	stx	%o3, [%o0 + 0x08]
     19	stx	%o4, [%o0 + 0x10]
     20	stx	%o5, [%o0 + 0x18]
     21	ldx	[%o1 + 0x20], %o2
     22	ldx	[%o1 + 0x28], %o3
     23	ldx	[%o1 + 0x30], %o4
     24	ldx	[%o1 + 0x38], %o5
     25	stx	%o2, [%o0 + 0x20]
     26	stx	%o3, [%o0 + 0x28]
     27	stx	%o4, [%o0 + 0x30]
     28	stx	%o5, [%o0 + 0x38]
     29	subcc	%g7, 64, %g7
     30	add	%o1, 64, %o1
     31	bne,pt	%xcc, 1b
     32	 add	%o0, 64, %o0
     33	retl
     34	 nop
     35
     36GENclear_page:
     37GENclear_user_page:
     38	set	PAGE_SIZE, %g7
     391:	stx	%g0, [%o0 + 0x00]
     40	stx	%g0, [%o0 + 0x08]
     41	stx	%g0, [%o0 + 0x10]
     42	stx	%g0, [%o0 + 0x18]
     43	stx	%g0, [%o0 + 0x20]
     44	stx	%g0, [%o0 + 0x28]
     45	stx	%g0, [%o0 + 0x30]
     46	stx	%g0, [%o0 + 0x38]
     47	subcc	%g7, 64, %g7
     48	bne,pt	%xcc, 1b
     49	 add	%o0, 64, %o0
     50
     51#define BRANCH_ALWAYS	0x10680000
     52#define NOP		0x01000000
     53#define GEN_DO_PATCH(OLD, NEW)	\
     54	sethi	%hi(NEW), %g1; \
     55	or	%g1, %lo(NEW), %g1; \
     56	sethi	%hi(OLD), %g2; \
     57	or	%g2, %lo(OLD), %g2; \
     58	sub	%g1, %g2, %g1; \
     59	sethi	%hi(BRANCH_ALWAYS), %g3; \
     60	sll	%g1, 11, %g1; \
     61	srl	%g1, 11 + 2, %g1; \
     62	or	%g3, %lo(BRANCH_ALWAYS), %g3; \
     63	or	%g3, %g1, %g3; \
     64	stw	%g3, [%g2]; \
     65	sethi	%hi(NOP), %g3; \
     66	or	%g3, %lo(NOP), %g3; \
     67	stw	%g3, [%g2 + 0x4]; \
     68	flush	%g2;
     69
     70	.globl	generic_patch_pageops
     71	.type	generic_patch_pageops,#function
     72generic_patch_pageops:
     73	GEN_DO_PATCH(copy_user_page, GENcopy_user_page)
     74	GEN_DO_PATCH(_clear_page, GENclear_page)
     75	GEN_DO_PATCH(clear_user_page, GENclear_user_page)
     76	retl
     77	 nop
     78	.size	generic_patch_pageops,.-generic_patch_pageops