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Linux/arch/sparc/lib/GENcopy_to_user.S

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 /* GENcopy_to_user.S: Generic sparc64 copy to userspace.
  3  *
  4  * Copyright (C) 2007 David S. Miller (davem@davemloft.net)
  5  */
  6 
  7 #define EX_ST(x,y)              \
  8 98:     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               GENcopy_to_user
 20 #define STORE(type,src,addr)    type##a src, [addr] ASI_AIUS
 21 #define EX_RETVAL(x)            0
 22 
 23 #ifdef __KERNEL__
 24         /* Writing to %asi is _expensive_ so we hardcode it.
 25          * Reading %asi to check for KERNEL_DS is comparatively
 26          * cheap.
 27          */
 28 #define PREAMBLE                                        \
 29         rd              %asi, %g1;                      \
 30         cmp             %g1, ASI_AIUS;                  \
 31         bne,pn          %icc, raw_copy_in_user;         \
 32          nop
 33 #endif
 34 
 35 #include "GENmemcpy.S"
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