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 EX_LD_FP(x)             \
  15 98:     x;                      \
  16         .section __ex_table,"a";\
  17         .align 4;               \
  18         .word 98b, __retl_one_fp;\
  19         .text;                  \
  20         .align 4;
  21
  22 #define FUNC_NAME               ___copy_from_user
  23 #define LOAD(type,addr,dest)    type##a [addr] %asi, dest
  24 #define LOAD_BLK(addr,dest)     ldda [addr] ASI_BLK_AIUS, dest
  25 #define EX_RETVAL(x)            0
  26
  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, ___copy_in_user;          \
  35          nop;                                           \
  36
  37 #include "U1memcpy.S"