/* $NetBSD: linux_exec.c,v 1.72 2004/08/08 19:52:37 jdolecek Exp $ */ /*- * Copyright (c) 1994, 1995, 1998, 2000 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Christos Zoulas, Frank van der Linden, Eric Haszlakiewicz and * Thor Lancelot Simon. * * 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. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the NetBSD * Foundation, Inc. and its contributors. * 4. Neither the name of The NetBSD Foundation 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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. */ #include __KERNEL_RCSID(0, "$NetBSD: linux_exec.c,v 1.72 2004/08/08 19:52:37 jdolecek Exp $"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include extern struct sysent linux_sysent[]; extern const char * const linux_syscallnames[]; extern char linux_sigcode[], linux_esigcode[]; static void linux_e_proc_exec __P((struct proc *, struct exec_package *)); static void linux_e_proc_fork __P((struct proc *, struct proc *, int)); static void linux_e_proc_exit __P((struct proc *)); static void linux_e_proc_init __P((struct proc *, struct proc *, int)); /* * Execve(2). Just check the alternate emulation path, and pass it on * to the NetBSD execve(). */ int linux_sys_execve(l, v, retval) struct lwp *l; void *v; register_t *retval; { struct linux_sys_execve_args /* { syscallarg(const char *) path; syscallarg(char **) argv; syscallarg(char **) envp; } */ *uap = v; struct proc *p = l->l_proc; struct sys_execve_args ap; caddr_t sg; sg = stackgap_init(p, 0); CHECK_ALT_EXIST(p, &sg, SCARG(uap, path)); SCARG(&ap, path) = SCARG(uap, path); SCARG(&ap, argp) = SCARG(uap, argp); SCARG(&ap, envp) = SCARG(uap, envp); return sys_execve(l, &ap, retval); } /* * Emulation switch. */ struct uvm_object *emul_linux_object; const struct emul emul_linux = { "linux", "/emul/linux", #ifndef __HAVE_MINIMAL_EMUL 0, (int*)native_to_linux_errno, LINUX_SYS_syscall, LINUX_SYS_NSYSENT, #endif linux_sysent, linux_syscallnames, linux_sendsig, linux_trapsignal, NULL, linux_sigcode, linux_esigcode, &emul_linux_object, linux_setregs, linux_e_proc_exec, linux_e_proc_fork, linux_e_proc_exit, NULL, NULL, #ifdef __HAVE_SYSCALL_INTERN linux_syscall_intern, #else #error Implement __HAVE_SYSCALL_INTERN for this platform #endif NULL, NULL, }; static void linux_e_proc_init(p, parent, forkflags) struct proc *p, *parent; int forkflags; { struct linux_emuldata *e = p->p_emuldata; struct linux_emuldata_shared *s; if (!e) { /* allocate new Linux emuldata */ MALLOC(e, void *, sizeof(struct linux_emuldata), M_EMULDATA, M_WAITOK); } else { e->s->refs--; if (e->s->refs == 0) FREE(e->s, M_EMULDATA); } memset(e, '\0', sizeof(struct linux_emuldata)); if (forkflags & FORK_SHAREVM) { struct linux_emuldata *e2 = parent->p_emuldata; s = e2->s; s->refs++; } else { struct vmspace *vm; MALLOC(s, void *, sizeof(struct linux_emuldata_shared), M_EMULDATA, M_WAITOK); s->refs = 1; /* * Set the process idea of the break to the real value. * For fork, we use parent's vmspace since our's * is not setup at the time of this call and is going * to be copy of parent's anyway. For exec, just * use our own vmspace. */ vm = (parent) ? parent->p_vmspace : p->p_vmspace; s->p_break = vm->vm_daddr + ctob(vm->vm_dsize); } e->s = s; p->p_emuldata = e; } /* * Allocate new per-process structures. Called when executing Linux * process. We can reuse the old emuldata - if it's not null, * the executed process is of same emulation as original forked one. */ static void linux_e_proc_exec(p, epp) struct proc *p; struct exec_package *epp; { /* exec, use our vmspace */ linux_e_proc_init(p, NULL, 0); } /* * Emulation per-process exit hook. */ static void linux_e_proc_exit(p) struct proc *p; { struct linux_emuldata *e = p->p_emuldata; /* free Linux emuldata and set the pointer to null */ e->s->refs--; if (e->s->refs == 0) FREE(e->s, M_EMULDATA); FREE(e, M_EMULDATA); p->p_emuldata = NULL; } /* * Emulation fork hook. */ static void linux_e_proc_fork(p, parent, forkflags) struct proc *p, *parent; int forkflags; { /* * The new process might share some vmspace-related stuff * with parent, depending on fork flags (CLONE_VM et.al). * Force allocation of new base emuldata, and share the * VM-related parts only if necessary. */ p->p_emuldata = NULL; linux_e_proc_init(p, parent, forkflags); }