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