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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dcr-low.S (844B)

      1/* SPDX-License-Identifier: GPL-2.0-or-later */
      2/*
      3 * "Indirect" DCR access
      4 *
      5 * Copyright (c) 2004 Eugene Surovegin <ebs@ebshome.net>
      6 */
      7
      8#include <asm/ppc_asm.h>
      9#include <asm/processor.h>
     10#include <asm/bug.h>
     11#include <asm/export.h>
     12
     13#define DCR_ACCESS_PROLOG(table) \
     14	cmplwi	cr0,r3,1024;	 \
     15	rlwinm  r3,r3,4,18,27;   \
     16	lis     r5,table@h;      \
     17	ori     r5,r5,table@l;   \
     18	add     r3,r3,r5;        \
     19	bge-	1f;		 \
     20	mtctr   r3;              \
     21	bctr;			 \
     221:	trap;			 \
     23	EMIT_BUG_ENTRY 1b,__FILE__,__LINE__,0;	\
     24	blr
     25
     26_GLOBAL(__mfdcr)
     27	DCR_ACCESS_PROLOG(__mfdcr_table)
     28EXPORT_SYMBOL(__mfdcr)
     29
     30_GLOBAL(__mtdcr)
     31	DCR_ACCESS_PROLOG(__mtdcr_table)
     32EXPORT_SYMBOL(__mtdcr)
     33
     34__mfdcr_table:
     35	mfdcr  r3,0; blr
     36__mtdcr_table:
     37	mtdcr  0,r4; blr
     38
     39dcr     = 1
     40        .rept   1023
     41	mfdcr   r3,dcr; blr
     42	mtdcr   dcr,r4; blr
     43	dcr     = dcr + 1
     44	.endr