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NetBSD/sys/compat/linux32/common/linux32_exec.c

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/* $NetBSD: linux32_exec.c,v 1.6 2007/03/05 14:13:10 christos 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 <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: linux32_exec.c,v 1.6 2007/03/05 14:13:10 christos Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/proc.h>
#include <sys/malloc.h>
#include <sys/namei.h>
#include <sys/vnode.h>
#include <sys/mount.h>
#include <sys/exec.h>
#include <sys/exec_elf.h>
#include <sys/mman.h>
#include <sys/syscallargs.h>
#include <sys/ptrace.h> /* For proc_reparent() */
#include <uvm/uvm_extern.h>
#include <machine/cpu.h>
#include <machine/reg.h>
#include <compat/linux/common/linux_types.h>
#include <compat/linux/common/linux_emuldata.h>
#include <compat/linux32/common/linux32_exec.h>
#include <compat/linux32/common/linux32_types.h>
#include <compat/linux32/common/linux32_signal.h>
#include <compat/linux32/common/linux32_machdep.h>
#include <compat/linux32/linux32_syscallargs.h>
#include <compat/linux32/linux32_syscall.h>
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 */
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