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Linux/arch/powerpc/math-emu/stfs.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 
 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 }
 43 

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