/* $NetBSD: linux32_exec.c,v 1.7 2007/10/19 12:16:39 ad Exp $ */ /*- * Copyright (c) 1994-2007 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, * Thor Lancelot Simon, and Emmanuel Dreyfus. * * 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: linux32_exec.c,v 1.7 2007/10/19 12:16:39 ad Exp $"); #include #include #include #include #include #include #include #include #include #include #include #include #include /* For proc_reparent() */ #include #include #include #include #include #include #include #include #include #include #include extern char linux32_sigcode[1]; extern char linux32_rt_sigcode[1]; extern char linux32_esigcode[1]; extern struct sysent linux32_sysent[]; extern const char * const linux32_syscallnames[]; static void linux32_e_proc_exec __P((struct proc *, struct exec_package *)); static void linux32_e_proc_fork __P((struct proc *, struct proc *, int)); static void linux32_e_proc_exit __P((struct proc *)); static void linux32_e_proc_init __P((struct proc *, struct proc *, int)); #ifdef LINUX32_NPTL void linux32_userret(void); void linux_nptl_proc_fork(struct proc *, struct proc *, void (*luserret)(void)); void linux_nptl_proc_exit __P((struct proc *)); void linux_nptl_proc_init __P((struct proc *, struct proc *)); #endif /* * Emulation switch. */ struct uvm_object *emul_linux32_object; const struct emul emul_linux32 = { "linux32", "/emul/linux32", #ifndef __HAVE_MINIMAL_EMUL 0, NULL, LINUX32_SYS_syscall, LINUX32_SYS_NSYSENT, #endif linux32_sysent, linux32_syscallnames, linux32_sendsig, trapsignal, NULL, linux32_sigcode, linux32_esigcode, &emul_linux32_object, linux32_setregs, linux32_e_proc_exec, linux32_e_proc_fork, linux32_e_proc_exit, NULL, NULL, linux32_syscall_intern, NULL, NULL, netbsd32_vm_default_addr, }; static void linux32_e_proc_init(p, parent, forkflags) struct proc *p, *parent; int forkflags; { struct linux_emuldata *e = p->p_emuldata; struct linux_emuldata_shared *s; struct linux_emuldata *ep = NULL; 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)); e->proc = p; if (parent) ep = parent->p_emuldata; if (forkflags & FORK_SHAREVM) { #ifdef DIAGNOSTIC if (ep == NULL) { killproc(p, "FORK_SHAREVM while emuldata is NULL\n"); return; } #endif s = ep->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 = (char *)vm->vm_daddr + ctob(vm->vm_dsize); /* * Linux threads are emulated as NetBSD processes (not lwp) * We use native PID for Linux TID. The Linux TID is the * PID of the first process in the group. It is stored * here */ s->group_pid = p->p_pid; /* * Initialize the list of threads in the group */ LIST_INIT(&s->threads); s->xstat = 0; s->flags = 0; } e->s = s; /* * Add this thread in the group thread list */ LIST_INSERT_HEAD(&s->threads, e, threads); #ifdef LINUX32_NPTL linux_nptl_proc_init(p, parent); #endif /* LINUX32_NPTL */ 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 linux32_e_proc_exec(p, epp) struct proc *p; struct exec_package *epp; { /* exec, use our vmspace */ linux32_e_proc_init(p, NULL, 0); } /* * Emulation per-process exit hook. */ static void linux32_e_proc_exit(p) struct proc *p; { struct linux_emuldata *e = p->p_emuldata; #ifdef LINUX32_NPTL linux_nptl_proc_exit(p); #endif /* LINUX32_NPTL */ /* Remove the thread for the group thread list */ LIST_REMOVE(e, threads); /* 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 linux32_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; linux32_e_proc_init(p, parent, forkflags); #ifdef LINUX32_NPTL linux_nptl_proc_fork(p, parent, linux32_userret); #endif return; } #ifdef LINUX32_NPTL void linux32_userret(void) { struct lwp *l = curlwp; struct proc *p = l->l_proc; struct linux_emuldata *led = p->p_emuldata; int error; /* LINUX_CLONE_CHILD_SETTID: copy child's TID to child's memory */ if (led->clone_flags & LINUX_CLONE_CHILD_SETTID) { if ((error = copyout(&l->l_proc->p_pid, led->child_tidptr, sizeof(l->l_proc->p_pid))) != 0) printf("linux32_userret: LINUX_CLONE_CHILD_SETTID " "failed (led->child_tidptr = %p, p->p_pid = %d)\n", led->child_tidptr, p->p_pid); } /* LINUX_CLONE_SETTLS: allocate a new TLS */ if (led->clone_flags & LINUX_CLONE_SETTLS) { if (linux32_set_newtls(l, linux32_get_newtls(l)) != 0) printf("linux32_userret: linux32_set_tls failed"); } return; } #endif /* LINUX32_NPTL */