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/arch/powerpc/math-emu/lfs.c

http://github.com/mirrors/linux
C | 47 lines | 36 code | 10 blank | 1 comment | 4 complexity | c5085b98780396f941e0f3a2baf238d9 MD5 | raw file
 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
11int
12lfs(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}