tools/testing/selftests/powerpc/mce/inject-ra-err.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2
   3 #include <errno.h>
   4 #include <fcntl.h>
   5 #include <signal.h>
   6 #include <stdio.h>
   7 #include <string.h>
   8 #include <sys/ioctl.h>
   9 #include <sys/mman.h>
  10 #include <sys/stat.h>
  11 #include <sys/types.h>
  12 #include <unistd.h>
  13
  14 #include "vas-api.h"
  15 #include "utils.h"
  16
  17 static bool faulted;
  18
  19 static void sigbus_handler(int n, siginfo_t *info, void *ctxt_v)
  20 {
  21         ucontext_t *ctxt = (ucontext_t *)ctxt_v;
  22         struct pt_regs *regs = ctxt->uc_mcontext.regs;
  23
  24         faulted = true;
  25         regs->nip += 4;
  26 }
  27
  28 static int test_ra_error(void)
  29 {
  30         struct vas_tx_win_open_attr attr;
  31         int fd, *paste_addr;
  32         char *devname = "/dev/crypto/nx-gzip";
  33         struct sigaction act = {
  34                 .sa_sigaction = sigbus_handler,
  35                 .sa_flags = SA_SIGINFO,
  36         };
  37
  38         memset(&attr, 0, sizeof(attr));
  39         attr.version = 1;
  40         attr.vas_id = 0;
  41
  42         SKIP_IF(access(devname, F_OK));
  43
  44         fd = open(devname, O_RDWR);
  45         FAIL_IF(fd < 0);
  46         FAIL_IF(ioctl(fd, VAS_TX_WIN_OPEN, &attr) < 0);
  47         FAIL_IF(sigaction(SIGBUS, &act, NULL) != 0);
  48
  49         paste_addr = mmap(NULL, 4096, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0ULL);
  50
  51         /* The following assignment triggers exception */
  52         mb();
  53         *paste_addr = 1;
  54         mb();
  55
  56         FAIL_IF(!faulted);
  57
  58         return 0;
  59 }
  60
  61 int main(void)
  62 {
  63         return test_harness(test_ra_error, "inject-ra-err");
  64 }
  65