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

atomics.c (3591B)

      1/*
      2 *  Copyright(c) 2019-2021 Qualcomm Innovation Center, Inc. All Rights Reserved.
      3 *
      4 *  This program is free software; you can redistribute it and/or modify
      5 *  it under the terms of the GNU General Public License as published by
      6 *  the Free Software Foundation; either version 2 of the License, or
      7 *  (at your option) any later version.
      8 *
      9 *  This program is distributed in the hope that it will be useful,
     10 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
     11 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     12 *  GNU General Public License for more details.
     13 *
     14 *  You should have received a copy of the GNU General Public License
     15 *  along with this program; if not, see <http://www.gnu.org/licenses/>.
     16 */
     17
     18#include <stdlib.h>
     19#include <stdio.h>
     20#include <string.h>
     21#include <unistd.h>
     22#include <inttypes.h>
     23#include <pthread.h>
     24
     25/* Using volatile because we are testing atomics */
     26static inline int atomic_inc32(volatile int *x)
     27{
     28    int old, dummy;
     29    __asm__ __volatile__(
     30        "1: %0 = memw_locked(%2)\n\t"
     31        "   %1 = add(%0, #1)\n\t"
     32        "   memw_locked(%2, p0) = %1\n\t"
     33        "   if (!p0) jump 1b\n\t"
     34        : "=&r"(old), "=&r"(dummy)
     35        : "r"(x)
     36        : "p0", "memory");
     37    return old;
     38}
     39
     40/* Using volatile because we are testing atomics */
     41static inline long long atomic_inc64(volatile long long *x)
     42{
     43    long long old, dummy;
     44    __asm__ __volatile__(
     45        "1: %0 = memd_locked(%2)\n\t"
     46        "   %1 = #1\n\t"
     47        "   %1 = add(%0, %1)\n\t"
     48        "   memd_locked(%2, p0) = %1\n\t"
     49        "   if (!p0) jump 1b\n\t"
     50        : "=&r"(old), "=&r"(dummy)
     51        : "r"(x)
     52        : "p0", "memory");
     53    return old;
     54}
     55
     56/* Using volatile because we are testing atomics */
     57static inline int atomic_dec32(volatile int *x)
     58{
     59    int old, dummy;
     60    __asm__ __volatile__(
     61        "1: %0 = memw_locked(%2)\n\t"
     62        "   %1 = add(%0, #-1)\n\t"
     63        "   memw_locked(%2, p0) = %1\n\t"
     64        "   if (!p0) jump 1b\n\t"
     65        : "=&r"(old), "=&r"(dummy)
     66        : "r"(x)
     67        : "p0", "memory");
     68    return old;
     69}
     70
     71/* Using volatile because we are testing atomics */
     72static inline long long atomic_dec64(volatile long long *x)
     73{
     74    long long old, dummy;
     75    __asm__ __volatile__(
     76        "1: %0 = memd_locked(%2)\n\t"
     77        "   %1 = #-1\n\t"
     78        "   %1 = add(%0, %1)\n\t"
     79        "   memd_locked(%2, p0) = %1\n\t"
     80        "   if (!p0) jump 1b\n\t"
     81        : "=&r"(old), "=&r"(dummy)
     82        : "r"(x)
     83        : "p0", "memory");
     84    return old;
     85}
     86
     87#define LOOP_CNT 1000
     88/* Using volatile because we are testing atomics */
     89volatile int tick32 = 1;
     90/* Using volatile because we are testing atomics */
     91volatile long long tick64 = 1;
     92int err;
     93
     94void *thread1_func(void *arg)
     95{
     96    int i;
     97
     98    for (i = 0; i < LOOP_CNT; i++) {
     99        atomic_inc32(&tick32);
    100        atomic_dec64(&tick64);
    101    }
    102    return NULL;
    103}
    104
    105void *thread2_func(void *arg)
    106{
    107    int i;
    108    for (i = 0; i < LOOP_CNT; i++) {
    109        atomic_dec32(&tick32);
    110        atomic_inc64(&tick64);
    111    }
    112    return NULL;
    113}
    114
    115void test_pthread(void)
    116{
    117    pthread_t tid1, tid2;
    118
    119    pthread_create(&tid1, NULL, thread1_func, "hello1");
    120    pthread_create(&tid2, NULL, thread2_func, "hello2");
    121    pthread_join(tid1, NULL);
    122    pthread_join(tid2, NULL);
    123
    124    if (tick32 != 1) {
    125        printf("ERROR: tick32 %d != 1\n", tick32);
    126        err++;
    127    }
    128    if (tick64 != 1) {
    129        printf("ERROR: tick64 %lld != 1\n", tick64);
    130        err++;
    131    }
    132}
    133
    134int main(int argc, char **argv)
    135{
    136    test_pthread();
    137    puts(err ? "FAIL" : "PASS");
    138    return err;
    139}