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| // SPDX-License-Identifier: GPL-2.0-or-later
| /*
| * Copyright 2015, Cyril Bur, IBM Corp.
| *
| * This test attempts to see if the FPU registers change across a syscall (fork).
| */
|
| #include <stdio.h>
| #include <unistd.h>
| #include <sys/syscall.h>
| #include <sys/time.h>
| #include <sys/types.h>
| #include <sys/wait.h>
| #include <stdlib.h>
|
| #include "utils.h"
|
| extern int test_fpu(double *darray, pid_t *pid);
|
| double darray[] = {0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0,
| 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0,
| 2.1};
|
| int syscall_fpu(void)
| {
| pid_t fork_pid;
| int i;
| int ret;
| int child_ret;
| for (i = 0; i < 1000; i++) {
| /* test_fpu will fork() */
| ret = test_fpu(darray, &fork_pid);
| if (fork_pid == -1)
| return -1;
| if (fork_pid == 0)
| exit(ret);
| waitpid(fork_pid, &child_ret, 0);
| if (ret || child_ret)
| return 1;
| }
|
| return 0;
| }
|
| int test_syscall_fpu(void)
| {
| /*
| * Setup an environment with much context switching
| */
| pid_t pid2;
| pid_t pid = fork();
| int ret;
| int child_ret;
| FAIL_IF(pid == -1);
|
| pid2 = fork();
| /* Can't FAIL_IF(pid2 == -1); because already forked once */
| if (pid2 == -1) {
| /*
| * Couldn't fork, ensure test is a fail
| */
| child_ret = ret = 1;
| } else {
| ret = syscall_fpu();
| if (pid2)
| waitpid(pid2, &child_ret, 0);
| else
| exit(ret);
| }
|
| ret |= child_ret;
|
| if (pid)
| waitpid(pid, &child_ret, 0);
| else
| exit(ret);
|
| FAIL_IF(ret || child_ret);
| return 0;
| }
|
| int main(int argc, char *argv[])
| {
| return test_harness(test_syscall_fpu, "syscall_fpu");
|
| }
|
|
