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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lshrdi3.c (559B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * lib/lshrdi3.c
      4 */
      5
      6#include <linux/module.h>
      7#include <linux/libgcc.h>
      8
      9long long notrace __lshrdi3(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 = 0;
     22		w.s.low = (unsigned int) uu.s.high >> -bm;
     23	} else {
     24		const unsigned int carries = (unsigned int) uu.s.high << bm;
     25
     26		w.s.high = (unsigned int) uu.s.high >> b;
     27		w.s.low = ((unsigned int) uu.s.low >> b) | carries;
     28	}
     29
     30	return w.ll;
     31}
     32EXPORT_SYMBOL(__lshrdi3);