tools/testing/selftests/powerpc/tm/tm-exec.c

   1 /*
   2  * Copyright 2016, Cyril Bur, IBM Corp.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License
   6  * as published by the Free Software Foundation; either version
   7  * 2 of the License, or (at your option) any later version.
   8  *
   9  * Syscalls can be performed provided the transactions are suspended.
  10  * The exec() class of syscall is unique as a new process is loaded.
  11  *
  12  * It makes little sense for after an exec() call for the previously
  13  * suspended transaction to still exist.
  14  */
  15
  16 #define _GNU_SOURCE
  17 #include <errno.h>
  18 #include <inttypes.h>
  19 #include <libgen.h>
  20 #include <pthread.h>
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <unistd.h>
  25
  26 #include "utils.h"
  27 #include "tm.h"
  28
  29 static char *path;
  30
  31 static int test_exec(void)
  32 {
  33         SKIP_IF(!have_htm());
  34
  35         asm __volatile__(
  36                 "tbegin.;"
  37                 "blt    1f; "
  38                 "tsuspend.;"
  39                 "1: ;"
  40                 : : : "memory");
  41
  42         execl(path, "tm-exec", "--child", NULL);
  43
  44         /* Shouldn't get here */
  45         perror("execl() failed");
  46         return 1;
  47 }
  48
  49 static int after_exec(void)
  50 {
  51         asm __volatile__(
  52                 "tbegin.;"
  53                 "blt    1f;"
  54                 "tsuspend.;"
  55                 "1: ;"
  56                 : : : "memory");
  57
  58         FAIL_IF(failure_is_nesting());
  59         return 0;
  60 }
  61
  62 int main(int argc, char *argv[])
  63 {
  64         path = argv[0];
  65
  66         if (argc > 1 && strcmp(argv[1], "--child") == 0)
  67                 return after_exec();
  68
  69         return test_harness(test_exec, "tm_exec");
  70 }