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
18 vector 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
23 extern int test_vmx(vector int *varray, pid_t *pid);
24
vmx_syscall(void)25 int 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
test_vmx_syscall(void)46 int test_vmx_syscall(void)
47 {
48 /*
49 * Setup an environment with much context switching
50 */
51 pid_t pid2;
52 pid_t pid;
53 int ret;
54 int child_ret;
55
56 // vcmpequd used in vmx_asm.S is v2.07
57 SKIP_IF(!have_hwcap2(PPC_FEATURE2_ARCH_2_07));
58
59 pid = fork();
60 FAIL_IF(pid == -1);
61
62 pid2 = fork();
63 ret = vmx_syscall();
64 /* Can't FAIL_IF(pid2 == -1); because we've already forked */
65 if (pid2 == -1) {
66 /*
67 * Couldn't fork, ensure child_ret is set and is a fail
68 */
69 ret = child_ret = 1;
70 } else {
71 if (pid2)
72 waitpid(pid2, &child_ret, 0);
73 else
74 exit(ret);
75 }
76
77 ret |= child_ret;
78
79 if (pid)
80 waitpid(pid, &child_ret, 0);
81 else
82 exit(ret);
83
84 FAIL_IF(ret || child_ret);
85 return 0;
86 }
87
main(int argc,char * argv[])88 int main(int argc, char *argv[])
89 {
90 return test_harness(test_vmx_syscall, "vmx_syscall");
91
92 }
93