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 FPU registers change across a syscall (fork).
6 */
7
8 #include <stdio.h>
9 #include <unistd.h>
10 #include <sys/syscall.h>
11 #include <sys/time.h>
12 #include <sys/types.h>
13 #include <sys/wait.h>
14 #include <stdlib.h>
15
16 #include "utils.h"
17
18 extern int test_fpu(double *darray, pid_t *pid);
19
20 double darray[] = {0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0,
21 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0,
22 2.1};
23
syscall_fpu(void)24 int syscall_fpu(void)
25 {
26 pid_t fork_pid;
27 int i;
28 int ret;
29 int child_ret;
30 for (i = 0; i < 1000; i++) {
31 /* test_fpu will fork() */
32 ret = test_fpu(darray, &fork_pid);
33 if (fork_pid == -1)
34 return -1;
35 if (fork_pid == 0)
36 exit(ret);
37 waitpid(fork_pid, &child_ret, 0);
38 if (ret || child_ret)
39 return 1;
40 }
41
42 return 0;
43 }
44
test_syscall_fpu(void)45 int test_syscall_fpu(void)
46 {
47 /*
48 * Setup an environment with much context switching
49 */
50 pid_t pid2;
51 pid_t pid = fork();
52 int ret;
53 int child_ret;
54 FAIL_IF(pid == -1);
55
56 pid2 = fork();
57 /* Can't FAIL_IF(pid2 == -1); because already forked once */
58 if (pid2 == -1) {
59 /*
60 * Couldn't fork, ensure test is a fail
61 */
62 child_ret = ret = 1;
63 } else {
64 ret = syscall_fpu();
65 if (pid2)
66 waitpid(pid2, &child_ret, 0);
67 else
68 exit(ret);
69 }
70
71 ret |= child_ret;
72
73 if (pid)
74 waitpid(pid, &child_ret, 0);
75 else
76 exit(ret);
77
78 FAIL_IF(ret || child_ret);
79 return 0;
80 }
81
main(int argc,char * argv[])82 int main(int argc, char *argv[])
83 {
84 return test_harness(test_syscall_fpu, "syscall_fpu");
85
86 }
87