arch/powerpc/math-emu/lfs.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <linux/types.h>
   3 #include <linux/errno.h>
   4 #include <linux/uaccess.h>
   5
   6 #include <asm/sfp-machine.h>
   7 #include <math-emu/soft-fp.h>
   8 #include <math-emu/double.h>
   9 #include <math-emu/single.h>
  10
  11 int
  12 lfs(void *frD, void *ea)
  13 {
  14         FP_DECL_D(R);
  15         FP_DECL_S(A);
  16         FP_DECL_EX;
  17         float f;
  18
  19 #ifdef DEBUG
  20         printk("%s: D %p, ea %p\n", __func__, frD, ea);
  21 #endif
  22
  23         if (copy_from_user(&f, ea, sizeof(float)))
  24                 return -EFAULT;
  25
  26         FP_UNPACK_S(A, f);
  27
  28 #ifdef DEBUG
  29         printk("A: %ld %lu %ld (%ld) [%08lx]\n", A_s, A_f, A_e, A_c,
  30                *(unsigned long *)&f);
  31 #endif
  32
  33         FP_CONV(D, S, 2, 1, R, A);
  34
  35 #ifdef DEBUG
  36         printk("R: %ld %lu %lu %ld (%ld)\n", R_s, R_f1, R_f0, R_e, R_c);
  37 #endif
  38
  39         if (R_c == FP_CLS_NAN) {
  40                 R_e = _FP_EXPMAX_D;
  41                 _FP_PACK_RAW_2_P(D, frD, R);
  42         } else {
  43                 __FP_PACK_D(frD, R);
  44         }
  45
  46         return 0;
  47 }