arch/sparc64/lib/U1copy_from_user.S

   1 /* U1copy_from_user.S: UltraSparc-I/II/IIi/IIe optimized copy from userspace.
   2  *
   3  * Copyright (C) 1999, 2000, 2004 David S. Miller (davem@redhat.com)
   4  */
   5
   6 #define EX_LD(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               ___copy_from_user
  19 #define LOAD(type,addr,dest)    type##a [addr] %asi, dest
  20 #define LOAD_BLK(addr,dest)     ldda [addr] ASI_BLK_AIUS, dest
  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 "U1memcpy.S"