197 lines
5.7 KiB
C
197 lines
5.7 KiB
C
/* $NetBSD: linux_exec.c,v 1.48 2001/03/24 11:13:04 jdolecek Exp $ */
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/*-
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* Copyright (c) 1994, 1995, 1998, 2000 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Christos Zoulas, Frank van der Linden, Eric Haszlakiewicz and
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* Thor Lancelot Simon.
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/proc.h>
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#include <sys/malloc.h>
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#include <sys/namei.h>
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#include <sys/vnode.h>
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#include <sys/mount.h>
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#include <sys/exec.h>
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#include <sys/exec_elf.h>
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#include <sys/mman.h>
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#include <sys/syscallargs.h>
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#include <machine/cpu.h>
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#include <machine/reg.h>
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#include <compat/linux/common/linux_types.h>
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#include <compat/linux/common/linux_signal.h>
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#include <compat/linux/common/linux_util.h>
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#include <compat/linux/common/linux_exec.h>
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#include <compat/linux/common/linux_machdep.h>
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#include <compat/linux/linux_syscallargs.h>
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#include <compat/linux/linux_syscall.h>
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#include <compat/linux/common/linux_misc.h>
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#include <compat/linux/common/linux_errno.h>
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#include <compat/linux/common/linux_emuldata.h>
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extern struct sysent linux_sysent[];
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extern const char * const linux_syscallnames[];
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extern char linux_sigcode[], linux_esigcode[];
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#ifndef __HAVE_SYSCALL_INTERN
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void syscall __P((void));
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#endif
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static void linux_e_proc_exec __P((struct proc *, struct exec_package *));
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static void linux_e_proc_fork __P((struct proc *, struct proc *));
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static void linux_e_proc_exit __P((struct proc *));
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static void linux_e_proc_init __P((struct proc *, struct vmspace *));
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/*
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* Execve(2). Just check the alternate emulation path, and pass it on
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* to the NetBSD execve().
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*/
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int
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linux_sys_execve(p, v, retval)
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struct proc *p;
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void *v;
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register_t *retval;
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{
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struct linux_sys_execve_args /* {
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syscallarg(const char *) path;
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syscallarg(char **) argv;
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syscallarg(char **) envp;
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} */ *uap = v;
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struct sys_execve_args ap;
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caddr_t sg;
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sg = stackgap_init(p->p_emul);
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CHECK_ALT_EXIST(p, &sg, SCARG(uap, path));
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SCARG(&ap, path) = SCARG(uap, path);
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SCARG(&ap, argp) = SCARG(uap, argp);
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SCARG(&ap, envp) = SCARG(uap, envp);
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return sys_execve(p, &ap, retval);
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}
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/*
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* Emulation switch.
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*/
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const struct emul emul_linux = {
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"linux",
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"/emul/linux",
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#ifndef __HAVE_MINIMAL_EMUL
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0,
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(int*)native_to_linux_errno,
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LINUX_SYS_syscall,
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LINUX_SYS_MAXSYSCALL,
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#endif
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linux_sysent,
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linux_syscallnames,
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linux_sendsig,
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linux_sigcode,
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linux_esigcode,
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linux_e_proc_exec,
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linux_e_proc_fork,
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linux_e_proc_exit,
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#ifdef __HAVE_SYSCALL_INTERN
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linux_syscall_intern,
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#else
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syscall,
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#endif
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};
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static void
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linux_e_proc_init(p, vmspace)
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struct proc *p;
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struct vmspace *vmspace;
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{
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if (!p->p_emuldata) {
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/* allocate new Linux emuldata */
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MALLOC(p->p_emuldata, void *, sizeof(struct linux_emuldata),
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M_EMULDATA, M_WAITOK);
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}
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memset(p->p_emuldata, '\0', sizeof(struct linux_emuldata));
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/* Set the process idea of the break to the real value */
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((struct linux_emuldata*)(p->p_emuldata))->p_break =
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vmspace->vm_daddr + ctob(vmspace->vm_dsize);
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}
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/*
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* Allocate per-process structures. Called when executing Linux
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* process. We can reuse the old emuldata - if it's not null,
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* the executed process is of same emulation as original forked one.
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*/
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static void
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linux_e_proc_exec(p, epp)
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struct proc *p;
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struct exec_package *epp;
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{
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/* exec, use our vmspace */
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linux_e_proc_init(p, p->p_vmspace);
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}
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/*
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* Emulation per-process exit hook.
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*/
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static void
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linux_e_proc_exit(p)
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struct proc *p;
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{
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/* free Linux emuldata and set the pointer to null */
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FREE(p->p_emuldata, M_EMULDATA);
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p->p_emuldata = NULL;
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}
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/*
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* Emulation fork hook.
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*/
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static void
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linux_e_proc_fork(p, parent)
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struct proc *p, *parent;
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{
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/*
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* It could be desirable to copy some stuff from parent's
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* emuldata. We don't need anything like that for now.
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* So just allocate new emuldata for the new process.
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*/
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p->p_emuldata = NULL;
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/* fork, use parent's vmspace (our vmspace may not be setup yet) */
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linux_e_proc_init(p, parent->p_vmspace);
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}
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