arch/powerpc/math-emu/stfs.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 stfs(void *frS, void *ea)
  13 {
  14         FP_DECL_D(A);
  15         FP_DECL_S(R);
  16         FP_DECL_EX;
  17         float f;
  18
  19 #ifdef DEBUG
  20         printk("%s: S %p, ea %p\n", __func__, frS, ea);
  21 #endif
  22
  23         FP_UNPACK_DP(A, frS);
  24
  25 #ifdef DEBUG
  26         printk("A: %ld %lu %lu %ld (%ld)\n", A_s, A_f1, A_f0, A_e, A_c);
  27 #endif
  28
  29         FP_CONV(S, D, 1, 2, R, A);
  30
  31 #ifdef DEBUG
  32         printk("R: %ld %lu %ld (%ld)\n", R_s, R_f, R_e, R_c);
  33 #endif
  34
  35         _FP_PACK_CANONICAL(S, 1, R);
  36         if (!FP_CUR_EXCEPTIONS || !__FPU_TRAP_P(FP_CUR_EXCEPTIONS)) {
  37                 _FP_PACK_RAW_1_P(S, &f, R);
  38                 if (copy_to_user(ea, &f, sizeof(float)))
  39                         return -EFAULT;
  40         }
  41
  42         return FP_CUR_EXCEPTIONS;
  43 }