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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NG4copy_to_user.S (983B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2/* NG4copy_to_user.S: Niagara-4 optimized copy to userspace.
      3 *
      4 * Copyright (C) 2012 David S. Miller (davem@davemloft.net)
      5 */
      6
      7#define EX_ST(x,y)		\
      898:	x;			\
      9	.section __ex_table,"a";\
     10	.align 4;		\
     11	.word 98b, y;		\
     12	.text;			\
     13	.align 4;
     14
     15#define EX_ST_FP(x,y)		\
     1698:	x;			\
     17	.section __ex_table,"a";\
     18	.align 4;		\
     19	.word 98b, y##_fp;	\
     20	.text;			\
     21	.align 4;
     22
     23#ifndef ASI_AIUS
     24#define ASI_AIUS	0x11
     25#endif
     26
     27#ifndef ASI_BLK_INIT_QUAD_LDD_AIUS
     28#define ASI_BLK_INIT_QUAD_LDD_AIUS 0x23
     29#endif
     30
     31#define FUNC_NAME		NG4copy_to_user
     32#define STORE(type,src,addr)	type##a src, [addr] %asi
     33#define STORE_ASI		ASI_BLK_INIT_QUAD_LDD_AIUS
     34#define EX_RETVAL(x)		0
     35
     36#ifdef __KERNEL__
     37	/* Writing to %asi is _expensive_ so we hardcode it.
     38	 * Reading %asi to check for KERNEL_DS is comparatively
     39	 * cheap.
     40	 */
     41#define PREAMBLE					\
     42	rd		%asi, %g1;			\
     43	cmp		%g1, ASI_AIUS;			\
     44	bne,pn		%icc, raw_copy_in_user;		\
     45	 nop
     46#endif
     47
     48#include "NG4memcpy.S"