kernel/arch/sparc/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 __ex_table,"a";\
   9         .align 4;               \
  10         .word 98b, __retl_one;  \
  11         .text;                  \
  12         .align 4;
  13
  14 #define FUNC_NAME               ___copy_from_user
  15 #define LOAD(type,addr,dest)    type##a [addr] %asi, dest
  16 #define LOAD_BLK(addr,dest)     ldda [addr] ASI_BLK_AIUS, dest
  17 #define EX_RETVAL(x)            0
  18
  19         /* Writing to %asi is _expensive_ so we hardcode it.
  20          * Reading %asi to check for KERNEL_DS is comparatively
  21          * cheap.
  22          */
  23 #define PREAMBLE                                        \
  24         rd              %asi, %g1;                      \
  25         cmp             %g1, ASI_AIUS;                  \
  26         bne,pn          %icc, ___copy_in_user;          \
  27          nop;                                           \
  28
  29 #include "U1memcpy.S"