release/src-rt-6.x.4708/linux/linux-2.6.36/arch/powerpc/math-emu/stfs.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 stfs(void *frS, void *ea)
  12 {
  13         FP_DECL_D(A);
  14         FP_DECL_S(R);
  15         FP_DECL_EX;
  16         float f;
  17
  18 #ifdef DEBUG
  19         printk("%s: S %p, ea %p\n", __func__, frS, ea);
  20 #endif
  21
  22         FP_UNPACK_DP(A, frS);
  23
  24 #ifdef DEBUG
  25         printk("A: %ld %lu %lu %ld (%ld)\n", A_s, A_f1, A_f0, A_e, A_c);
  26 #endif
  27
  28         FP_CONV(S, D, 1, 2, R, A);
  29
  30 #ifdef DEBUG
  31         printk("R: %ld %lu %ld (%ld)\n", R_s, R_f, R_e, R_c);
  32 #endif
  33
  34         _FP_PACK_CANONICAL(S, 1, R);
  35         if (!FP_CUR_EXCEPTIONS || !__FPU_TRAP_P(FP_CUR_EXCEPTIONS)) {
  36                 _FP_PACK_RAW_1_P(S, &f, R);
  37                 if (copy_to_user(ea, &f, sizeof(float)))
  38                         return -EFAULT;
  39         }
  40
  41         return FP_CUR_EXCEPTIONS;
  42 }