lfs.c 830 B

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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. #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. int
  10. lfs(void *frD, void *ea)
  11. {
  12. FP_DECL_D(R);
  13. FP_DECL_S(A);
  14. FP_DECL_EX;
  15. float f;
  16. #ifdef DEBUG
  17. printk("%s: D %p, ea %p\n", __func__, frD, ea);
  18. #endif
  19. if (copy_from_user(&f, ea, sizeof(float)))
  20. return -EFAULT;
  21. FP_UNPACK_S(A, f);
  22. #ifdef DEBUG
  23. printk("A: %ld %lu %ld (%ld) [%08lx]\n", A_s, A_f, A_e, A_c,
  24. *(unsigned long *)&f);
  25. #endif
  26. FP_CONV(D, S, 2, 1, R, A);
  27. #ifdef DEBUG
  28. printk("R: %ld %lu %lu %ld (%ld)\n", R_s, R_f1, R_f0, R_e, R_c);
  29. #endif
  30. if (R_c == FP_CLS_NAN) {
  31. R_e = _FP_EXPMAX_D;
  32. _FP_PACK_RAW_2_P(D, frD, R);
  33. } else {
  34. __FP_PACK_D(frD, R);
  35. }
  36. return 0;
  37. }