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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reg_convert.c (1665B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*---------------------------------------------------------------------------+
      3 |  reg_convert.c                                                            |
      4 |                                                                           |
      5 |  Convert register representation.                                         |
      6 |                                                                           |
      7 | Copyright (C) 1992,1993,1994,1996,1997                                    |
      8 |                  W. Metzenthen, 22 Parker St, Ormond, Vic 3163, Australia |
      9 |                  E-mail   billm@suburbia.net                              |
     10 |                                                                           |
     11 |                                                                           |
     12 +---------------------------------------------------------------------------*/
     13
     14#include "exception.h"
     15#include "fpu_emu.h"
     16
     17int FPU_to_exp16(FPU_REG const *a, FPU_REG *x)
     18{
     19	int sign = getsign(a);
     20
     21	*(long long *)&(x->sigl) = *(const long long *)&(a->sigl);
     22
     23	/* Set up the exponent as a 16 bit quantity. */
     24	setexponent16(x, exponent(a));
     25
     26	if (exponent16(x) == EXP_UNDER) {
     27		/* The number is a de-normal or pseudodenormal. */
     28		/* We only deal with the significand and exponent. */
     29
     30		if (x->sigh & 0x80000000) {
     31			/* Is a pseudodenormal. */
     32			/* This is non-80486 behaviour because the number
     33			   loses its 'denormal' identity. */
     34			addexponent(x, 1);
     35		} else {
     36			/* Is a denormal. */
     37			addexponent(x, 1);
     38			FPU_normalize_nuo(x);
     39		}
     40	}
     41
     42	if (!(x->sigh & 0x80000000)) {
     43		EXCEPTION(EX_INTERNAL | 0x180);
     44	}
     45
     46	return sign;
     47}