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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ashrdi3.c (565B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 */
      4
      5#include <linux/export.h>
      6
      7#include <linux/libgcc.h>
      8
      9long long notrace __ashrdi3(long long u, word_type b)
     10{
     11	DWunion uu, w;
     12	word_type bm;
     13
     14	if (b == 0)
     15		return u;
     16
     17	uu.ll = u;
     18	bm = 32 - b;
     19
     20	if (bm <= 0) {
     21		/* w.s.high = 1..1 or 0..0 */
     22		w.s.high =
     23		    uu.s.high >> 31;
     24		w.s.low = uu.s.high >> -bm;
     25	} else {
     26		const unsigned int carries = (unsigned int) uu.s.high << bm;
     27
     28		w.s.high = uu.s.high >> b;
     29		w.s.low = ((unsigned int) uu.s.low >> b) | carries;
     30	}
     31
     32	return w.ll;
     33}
     34EXPORT_SYMBOL(__ashrdi3);