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

hex_sigsegv.c (2907B)

      1/*
      2 *  Copyright(c) 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/*
     19 * Test the VLIW semantics of two stores in a packet
     20 *
     21 * When a packet has 2 stores, either both commit or neither commit.
     22 * We test this with a packet that does stores to both NULL and a global
     23 * variable, "should_not_change".  After the SIGSEGV is caught, we check
     24 * that the "should_not_change" value is the same.
     25 */
     26
     27#include <stdlib.h>
     28#include <stdio.h>
     29#include <unistd.h>
     30#include <sys/types.h>
     31#include <fcntl.h>
     32#include <setjmp.h>
     33#include <signal.h>
     34
     35typedef unsigned char uint8_t;
     36
     37int err;
     38int segv_caught;
     39
     40#define SHOULD_NOT_CHANGE_VAL        5
     41int should_not_change = SHOULD_NOT_CHANGE_VAL;
     42
     43#define BUF_SIZE        300
     44unsigned char buf[BUF_SIZE];
     45
     46
     47static void __check(const char *filename, int line, int x, int expect)
     48{
     49    if (x != expect) {
     50        printf("ERROR %s:%d - %d != %d\n",
     51               filename, line, x, expect);
     52        err++;
     53    }
     54}
     55
     56#define check(x, expect) __check(__FILE__, __LINE__, (x), (expect))
     57
     58static void __chk_error(const char *filename, int line, int ret)
     59{
     60    if (ret < 0) {
     61        printf("ERROR %s:%d - %d\n", filename, line, ret);
     62        err++;
     63    }
     64}
     65
     66#define chk_error(ret) __chk_error(__FILE__, __LINE__, (ret))
     67
     68jmp_buf jmp_env;
     69
     70static void sig_segv(int sig, siginfo_t *info, void *puc)
     71{
     72    check(sig, SIGSEGV);
     73    segv_caught = 1;
     74    longjmp(jmp_env, 1);
     75}
     76
     77int main()
     78{
     79    struct sigaction act;
     80
     81    /* SIGSEGV test */
     82    act.sa_sigaction = sig_segv;
     83    sigemptyset(&act.sa_mask);
     84    act.sa_flags = SA_SIGINFO;
     85    chk_error(sigaction(SIGSEGV, &act, NULL));
     86    if (setjmp(jmp_env) == 0) {
     87        asm volatile("r18 = ##should_not_change\n\t"
     88                     "r19 = #0\n\t"
     89                     "{\n\t"
     90                     "    memw(r18) = #7\n\t"
     91                     "    memw(r19) = #0\n\t"
     92                     "}\n\t"
     93                      : : : "r18", "r19", "memory");
     94    }
     95
     96    act.sa_handler = SIG_DFL;
     97    sigemptyset(&act.sa_mask);
     98    act.sa_flags = 0;
     99    chk_error(sigaction(SIGSEGV, &act, NULL));
    100
    101    check(segv_caught, 1);
    102    check(should_not_change, SHOULD_NOT_CHANGE_VAL);
    103
    104    puts(err ? "FAIL" : "PASS");
    105    return err ? EXIT_FAILURE : EXIT_SUCCESS;
    106}