cachepc-qemu

Fork of AMDESE/qemu with changes for cachepc side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-qemu
Log | Files | Refs | Submodules | LICENSE | sfeed.txt

bitmanip_helper.c (1493B)

      1/*
      2 * RISC-V Bitmanip Extension Helpers for QEMU.
      3 *
      4 * Copyright (c) 2020 Kito Cheng, kito.cheng@sifive.com
      5 * Copyright (c) 2020 Frank Chang, frank.chang@sifive.com
      6 * Copyright (c) 2021 Philipp Tomsich, philipp.tomsich@vrull.eu
      7 *
      8 * This program is free software; you can redistribute it and/or modify it
      9 * under the terms and conditions of the GNU General Public License,
     10 * version 2 or later, as published by the Free Software Foundation.
     11 *
     12 * This program is distributed in the hope it will be useful, but WITHOUT
     13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
     14 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
     15 * more details.
     16 *
     17 * You should have received a copy of the GNU General Public License along with
     18 * this program.  If not, see <http://www.gnu.org/licenses/>.
     19 */
     20
     21#include "qemu/osdep.h"
     22#include "qemu/host-utils.h"
     23#include "exec/exec-all.h"
     24#include "exec/helper-proto.h"
     25#include "tcg/tcg.h"
     26
     27target_ulong HELPER(clmul)(target_ulong rs1, target_ulong rs2)
     28{
     29    target_ulong result = 0;
     30
     31    for (int i = 0; i < TARGET_LONG_BITS; i++) {
     32        if ((rs2 >> i) & 1) {
     33            result ^= (rs1 << i);
     34        }
     35    }
     36
     37    return result;
     38}
     39
     40target_ulong HELPER(clmulr)(target_ulong rs1, target_ulong rs2)
     41{
     42    target_ulong result = 0;
     43
     44    for (int i = 0; i < TARGET_LONG_BITS; i++) {
     45        if ((rs2 >> i) & 1) {
     46            result ^= (rs1 >> (TARGET_LONG_BITS - i - 1));
     47        }
     48    }
     49
     50    return result;
     51}