/* * Copyright (c) 2000, 2001, 2002, 2003, 2004, 2005, 2008, 2009 * The President and Fellows of Harvard College. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE UNIVERSITY AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE UNIVERSITY OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. *//* * Sample/test code for running a user program. You can use this for * reference when implementing the execv() system call. Remember though * that execv() needs to do more than this function does. */#include #include #include #include #include #include #include #include #include #include #include /* * Load program "progname" and start running it in usermode. * Does not return except on error. * * Calls vfs_open on progname and thus may destroy it. */intrunprogram(char *progname){struct vnode *v;vaddr_t entrypoint, stackptr;int result;/* Open the file. */result = vfs_open(progname, O_RDONLY, 0, &v);if (result) {return result;}/* We should be a new thread. */KASSERT(curthread->t_addrspace == NULL);/* Create a new address space. */curthread->t_addrspace = as_create();if (curthread->t_addrspace==NULL) {vfs_close(v);return ENOMEM;}/* Activate it. */as_activate(curthread->t_addrspace);/* Load the executable. */result = load_elf(v, &entrypoint);if (result) {/* thread_exit destroys curthread->t_addrspace */vfs_close(v);return result;}/* Done with the file now. */vfs_close(v);/* Define the user stack in the address space */result = as_define_stack(curthread->t_addrspace, &stackptr);if (result) {/* thread_exit destroys curthread->t_addrspace */return result;}/* Warp to user mode. */enter_new_process(0 /*argc*/, NULL /*userspace addr of argv*/, stackptr, entrypoint);/* enter_new_process does not return. */panic("enter_new_process returned\n");return EINVAL;}