linux/arch/powerpc/math-emu/lfs.c
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   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
  10int
  11lfs(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}
  47