arch/sparc64/lib/U3copy_to_user.S

   1 /* U3copy_to_user.S: UltraSparc-III optimized copy to userspace.
   2  *
   3  * Copyright (C) 1999, 2000, 2004 David S. Miller (davem@redhat.com)
   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;    \
  13         .align 4;               \
  14         .word 98b, 99b;         \
  15         .text;                  \
  16         .align 4;
  17
  18 #define FUNC_NAME               U3copy_to_user
  19 #define STORE(type,src,addr)    type##a src, [addr] ASI_AIUS
  20 #define STORE_BLK(src,addr)     stda src, [addr] ASI_BLK_AIUS
  21 #define EX_RETVAL(x)            0
  22
  23         /* Writing to %asi is _expensive_ so we hardcode it.
  24          * Reading %asi to check for KERNEL_DS is comparatively
  25          * cheap.
  26          */
  27 #define PREAMBLE                                        \
  28         rd              %asi, %g1;                      \
  29         cmp             %g1, ASI_AIUS;                  \
  30         bne,pn          %icc, memcpy_user_stub;         \
  31          nop;                                           \
  32
  33 #include "U3memcpy.S"