/*
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* Copyright 2015, Cyril Bur, IBM Corp.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* This test attempts to see if the FPU registers change across a syscall (fork).
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*/
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#include <stdio.h>
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#include <unistd.h>
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#include <sys/syscall.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <stdlib.h>
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#include "utils.h"
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extern int test_fpu(double *darray, pid_t *pid);
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double darray[] = {0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0,
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1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0,
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2.1};
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int syscall_fpu(void)
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{
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pid_t fork_pid;
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int i;
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int ret;
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int child_ret;
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for (i = 0; i < 1000; i++) {
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/* test_fpu will fork() */
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ret = test_fpu(darray, &fork_pid);
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if (fork_pid == -1)
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return -1;
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if (fork_pid == 0)
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exit(ret);
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waitpid(fork_pid, &child_ret, 0);
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if (ret || child_ret)
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return 1;
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}
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return 0;
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}
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int test_syscall_fpu(void)
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{
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/*
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* Setup an environment with much context switching
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*/
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pid_t pid2;
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pid_t pid = fork();
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int ret;
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int child_ret;
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FAIL_IF(pid == -1);
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pid2 = fork();
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/* Can't FAIL_IF(pid2 == -1); because already forked once */
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if (pid2 == -1) {
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/*
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* Couldn't fork, ensure test is a fail
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*/
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child_ret = ret = 1;
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} else {
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ret = syscall_fpu();
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if (pid2)
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waitpid(pid2, &child_ret, 0);
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else
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exit(ret);
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}
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ret |= child_ret;
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if (pid)
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waitpid(pid, &child_ret, 0);
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else
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exit(ret);
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FAIL_IF(ret || child_ret);
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return 0;
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}
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int main(int argc, char *argv[])
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{
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return test_harness(test_syscall_fpu, "syscall_fpu");
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}
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