release/src-rt-6.x.4708/linux/linux-2.6.36/arch/powerpc/math-emu/lfs.c

   1 #include <linux/types.h>
   2 #include <linux/errno.h>
   3 #include <asm/uaccess.h>
   4
   5 #include <asm/sfp-machine.h>
   6 #include <math-emu/soft-fp.h>
   7 #include <math-emu/double.h>
   8 #include <math-emu/single.h>
   9
  10 int
  11 lfs(void *frD, void *ea)
  12 {
  13         FP_DECL_D(R);
  14         FP_DECL_S(A);
  15         FP_DECL_EX;
  16         float f;
  17
  18 #ifdef DEBUG
  19         printk("%s: D %p, ea %p\n", __func__, frD, ea);
  20 #endif
  21
  22         if (copy_from_user(&f, ea, sizeof(float)))
  23                 return -EFAULT;
  24
  25         FP_UNPACK_S(A, f);
  26
  27 #ifdef DEBUG
  28         printk("A: %ld %lu %ld (%ld) [%08lx]\n", A_s, A_f, A_e, A_c,
  29                *(unsigned long *)&f);
  30 #endif
  31
  32         FP_CONV(D, S, 2, 1, R, A);
  33
  34 #ifdef DEBUG
  35         printk("R: %ld %lu %lu %ld (%ld)\n", R_s, R_f1, R_f0, R_e, R_c);
  36 #endif
  37
  38         if (R_c == FP_CLS_NAN) {
  39                 R_e = _FP_EXPMAX_D;
  40                 _FP_PACK_RAW_2_P(D, frD, R);
  41         } else {
  42                 __FP_PACK_D(frD, R);
  43         }
  44
  45         return 0;
  46 }