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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
01127f1e CB |
2 | /* |
3 | * Copyright 2015, Cyril Bur, IBM Corp. | |
4 | * | |
01127f1e CB |
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 | ||
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 | ||
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 | ||
82 | int main(int argc, char *argv[]) | |
83 | { | |
84 | return test_harness(test_syscall_fpu, "syscall_fpu"); | |
85 | ||
86 | } |