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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NGcopy_to_user.S (784B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2/* NGcopy_to_user.S: Niagara optimized copy to userspace.
      3 *
      4 * Copyright (C) 2006, 2007 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#ifndef ASI_AIUS
     16#define ASI_AIUS	0x11
     17#endif
     18
     19#define FUNC_NAME		NGcopy_to_user
     20#define STORE(type,src,addr)	type##a src, [addr] ASI_AIUS
     21#define STORE_ASI		ASI_BLK_INIT_QUAD_LDD_AIUS
     22#define EX_RETVAL(x)		%g0
     23
     24#ifdef __KERNEL__
     25	/* Writing to %asi is _expensive_ so we hardcode it.
     26	 * Reading %asi to check for KERNEL_DS is comparatively
     27	 * cheap.
     28	 */
     29#define PREAMBLE					\
     30	rd		%asi, %g1;			\
     31	cmp		%g1, ASI_AIUS;			\
     32	bne,pn		%icc, raw_copy_in_user;		\
     33	 nop
     34#endif
     35
     36#include "NGmemcpy.S"