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
18extern int test_fpu(double *darray, pid_t *pid);
19
20double 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
24int 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
45int 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
82int main(int argc, char *argv[])
83{
84	return test_harness(test_syscall_fpu, "syscall_fpu");
85
86}