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

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright 2015, Michael Neuling, IBM Corp.
   4  *
   5  * Edited: Rashmica Gupta, Nov 2015
   6  *
   7  * This test does a fork syscall inside a transaction. Basic sniff test
   8  * to see if we can enter the kernel during a transaction.
   9  */
  10
  11 #include <errno.h>
  12 #include <inttypes.h>
  13 #include <pthread.h>
  14 #include <stdio.h>
  15 #include <stdlib.h>
  16 #include <unistd.h>
  17
  18 #include "utils.h"
  19 #include "tm.h"
  20
  21 int test_fork(void)
  22 {
  23         SKIP_IF(!have_htm());
  24         SKIP_IF(htm_is_synthetic());
  25
  26         asm __volatile__(
  27                 "tbegin.;"
  28                 "blt    1f; "
  29                 "li     0, 2;"  /* fork syscall */
  30                 "sc  ;"
  31                 "tend.;"
  32                 "1: ;"
  33                 : : : "memory", "r0");
  34         /* If we reach here, we've passed.  Otherwise we've probably crashed
  35          * the kernel */
  36
  37         return 0;
  38 }
  39
  40 int main(int argc, char *argv[])
  41 {
  42         return test_harness(test_fork, "tm_fork");
  43 }