LXR linux/tools/testing/selftests/powerpc/math/vmx

   1/*
   2 * Copyright 2015, 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 * This test attempts to see if the VMX registers change across a syscall (fork).
  10 */
  11
  12#include <altivec.h>
  13#include <stdio.h>
  14#include <unistd.h>
  15#include <sys/syscall.h>
  16#include <sys/time.h>
  17#include <stdlib.h>
  18#include <sys/types.h>
  19#include <sys/wait.h>
  20#include "utils.h"
  21
  22vector int varray[] = {{1, 2, 3, 4}, {5, 6, 7, 8}, {9, 10,11,12},
  23        {13,14,15,16},{17,18,19,20},{21,22,23,24},
  24        {25,26,27,28},{29,30,31,32},{33,34,35,36},
  25        {37,38,39,40},{41,42,43,44},{45,46,47,48}};
  26
  27extern int test_vmx(vector int *varray, pid_t *pid);
  28
  29int vmx_syscall(void)
  30{
  31        pid_t fork_pid;
  32        int i;
  33        int ret;
  34        int child_ret;
  35        for (i = 0; i < 1000; i++) {
  36                /* test_vmx will fork() */
  37                ret = test_vmx(varray, &fork_pid);
  38                if (fork_pid == -1)
  39                        return -1;
  40                if (fork_pid == 0)
  41                        exit(ret);
  42                waitpid(fork_pid, &child_ret, 0);
  43                if (ret || child_ret)
  44                        return 1;
  45        }
  46
  47        return 0;
  48}
  49
  50int test_vmx_syscall(void)
  51{
  52        /*
  53         * Setup an environment with much context switching
  54         */
  55        pid_t pid2;
  56        pid_t pid = fork();
  57        int ret;
  58        int child_ret;
  59        FAIL_IF(pid == -1);
  60
  61        pid2 = fork();
  62        ret = vmx_syscall();
  63        /* Can't FAIL_IF(pid2 == -1); because we've already forked */
  64        if (pid2 == -1) {
  65                /*
  66                 * Couldn't fork, ensure child_ret is set and is a fail
  67                 */
  68                ret = child_ret = 1;
  69        } else {
  70                if (pid2)
  71                        waitpid(pid2, &child_ret, 0);
  72                else
  73                        exit(ret);
  74        }
  75
  76        ret |= child_ret;
  77
  78        if (pid)
  79                waitpid(pid, &child_ret, 0);
  80        else
  81                exit(ret);
  82
  83        FAIL_IF(ret || child_ret);
  84        return 0;
  85}
  86
  87int main(int argc, char *argv[])
  88{
  89        return test_harness(test_vmx_syscall, "vmx_syscall");
  90
  91}
  92