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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fsqrt.c (746B)

      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
     10int
     11fsqrt(void *frD, void *frB)
     12{
     13	FP_DECL_D(B);
     14	FP_DECL_D(R);
     15	FP_DECL_EX;
     16
     17#ifdef DEBUG
     18	printk("%s: %p %p %p %p\n", __func__, frD, frB);
     19#endif
     20
     21	FP_UNPACK_DP(B, frB);
     22
     23#ifdef DEBUG
     24	printk("B: %ld %lu %lu %ld (%ld)\n", B_s, B_f1, B_f0, B_e, B_c);
     25#endif
     26
     27	if (B_s && B_c != FP_CLS_ZERO)
     28		FP_SET_EXCEPTION(EFLAG_VXSQRT);
     29	if (B_c == FP_CLS_NAN)
     30		FP_SET_EXCEPTION(EFLAG_VXSNAN);
     31
     32	FP_SQRT_D(R, B);
     33
     34#ifdef DEBUG
     35	printk("R: %ld %lu %lu %ld (%ld)\n", R_s, R_f1, R_f0, R_e, R_c);
     36#endif
     37
     38	__FP_PACK_D(frD, R);
     39
     40	return FP_CUR_EXCEPTIONS;
     41}