cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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lfs.c (830B)

      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}