tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright 2015, Cyril Bur, IBM Corp.
4 *
5 * This test attempts to see if the VMX registers change across a syscall (fork).
6 */
7
8#include <altivec.h>
9#include <stdio.h>
10#include <unistd.h>
11#include <sys/syscall.h>
12#include <sys/time.h>
13#include <stdlib.h>
14#include <sys/types.h>
15#include <sys/wait.h>
16#include "utils.h"
17
18vector int varray[] = {{1, 2, 3, 4}, {5, 6, 7, 8}, {9, 10,11,12},
19 {13,14,15,16},{17,18,19,20},{21,22,23,24},
20 {25,26,27,28},{29,30,31,32},{33,34,35,36},
21 {37,38,39,40},{41,42,43,44},{45,46,47,48}};
22
23extern int test_vmx(vector int *varray, pid_t *pid);
24
25int vmx_syscall(void)
26{
27 pid_t fork_pid;
28 int i;
29 int ret;
30 int child_ret;
31 for (i = 0; i < 1000; i++) {
32 /* test_vmx will fork() */
33 ret = test_vmx(varray, &fork_pid);
34 if (fork_pid == -1)
35 return -1;
36 if (fork_pid == 0)
37 exit(ret);
38 waitpid(fork_pid, &child_ret, 0);
39 if (ret || child_ret)
40 return 1;
41 }
42
43 return 0;
44}
45
46int test_vmx_syscall(void)
47{
48 /*
49 * Setup an environment with much context switching
50 */
51 pid_t pid2;
52 pid_t pid = fork();
53 int ret;
54 int child_ret;
55 FAIL_IF(pid == -1);
56
57 pid2 = fork();
58 ret = vmx_syscall();
59 /* Can't FAIL_IF(pid2 == -1); because we've already forked */
60 if (pid2 == -1) {
61 /*
62 * Couldn't fork, ensure child_ret is set and is a fail
63 */
64 ret = child_ret = 1;
65 } else {
66 if (pid2)
67 waitpid(pid2, &child_ret, 0);
68 else
69 exit(ret);
70 }
71
72 ret |= child_ret;
73
74 if (pid)
75 waitpid(pid, &child_ret, 0);
76 else
77 exit(ret);
78
79 FAIL_IF(ret || child_ret);
80 return 0;
81}
82
83int main(int argc, char *argv[])
84{
85 return test_harness(test_vmx_syscall, "vmx_syscall");
86
87}