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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stfs.c (822B)

      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
     12stfs(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}