arch/sparc/lib/GENcopy_to_user.S

   1 /* GENcopy_to_user.S: Generic sparc64 copy to userspace.
   2  *
   3  * Copyright (C) 2007 David S. Miller (davem@davemloft.net)
   4  */
   5
   6 #define EX_ST(x)                \
   7 98:     x;                      \
   8         .section .fixup;        \
   9         .align 4;               \
  10 99:     retl;                   \
  11          mov    1, %o0;         \
  12         .section __ex_table,"a";\
  13         .align 4;               \
  14         .word 98b, 99b;         \
  15         .text;                  \
  16         .align 4;
  17
  18 #ifndef ASI_AIUS
  19 #define ASI_AIUS        0x11
  20 #endif
  21
  22 #define FUNC_NAME               GENcopy_to_user
  23 #define STORE(type,src,addr)    type##a src, [addr] ASI_AIUS
  24 #define EX_RETVAL(x)            0
  25
  26 #ifdef __KERNEL__
  27         /* Writing to %asi is _expensive_ so we hardcode it.
  28          * Reading %asi to check for KERNEL_DS is comparatively
  29          * cheap.
  30          */
  31 #define PREAMBLE                                        \
  32         rd              %asi, %g1;                      \
  33         cmp             %g1, ASI_AIUS;                  \
  34         bne,pn          %icc, memcpy_user_stub;         \
  35          nop
  36 #endif
  37
  38 #include "GENmemcpy.S"