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Linux/arch/powerpc/math-emu/stfs.c

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  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 }
 44 

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