/* $NetBSD: freebsd_misc.c,v 1.34 2021/09/07 11:43:03 riastradh Exp $ */

/* $NetBSD: freebsd_misc.c,v 1.34 2021/09/07 11:43:03 riastradh Exp $ */

/*
* Copyright (c) 1995 Frank van der Linden
* All rights reserved.
*
* 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 for the NetBSD Project
* by Frank van der Linden
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/

/*
* FreeBSD compatibility module. Try to deal with various FreeBSD system calls.
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: freebsd_misc.c,v 1.34 2021/09/07 11:43:03 riastradh Exp $");

#if defined(_KERNEL_OPT)
#include "opt_ntp.h"
#endif

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/mount.h>
#include <sys/signal.h>
#include <sys/signalvar.h>
#include <sys/mman.h>
#include <sys/ktrace.h>

#include <sys/syscallargs.h>

#include <compat/freebsd/freebsd_syscallargs.h>
#include <compat/common/compat_util.h>
#include <compat/freebsd/freebsd_rtprio.h>
#include <compat/freebsd/freebsd_timex.h>
#include <compat/freebsd/freebsd_signal.h>
#include <compat/freebsd/freebsd_mman.h>

int
freebsd_sys_msync(struct lwp *l, const struct freebsd_sys_msync_args *uap, register_t *retval)
{
/* {
syscallarg(void *) addr;
syscallarg(size_t) len;
syscallarg(int) flags;
} */
struct sys___msync13_args bma;

/*
* FreeBSD-2.0-RELEASE's msync(2) is compatible with NetBSD's.
* FreeBSD-2.0.5-RELEASE's msync(2) has addtional argument `flags',
* but syscall number is not changed. :-<
*/
SCARG(&bma, addr) = SCARG(uap, addr);
SCARG(&bma, len) = SCARG(uap, len);
SCARG(&bma, flags) = SCARG(uap, flags);
return sys___msync13(l, &bma, retval);
}

int
freebsd_sys_mmap(struct lwp *l, const struct freebsd_sys_mmap_args *uap, register_t *retval)
{
/* {
syscallarg(void *) addr;
syscallarg(size_t) len;
syscallarg(int) prot;
syscallarg(int) flags;
syscallarg(int) fd;
syscallarg(long) pad;
syscallarg(off_t) pos;
} */
struct sys_mmap_args bma;
int flags, prot, fd;
off_t pos;

prot = SCARG(uap, prot);
flags = SCARG(uap, flags);
fd = SCARG(uap, fd);
pos = SCARG(uap, pos);

/*
* If using MAP_STACK on FreeBSD:
*
* + fd has to be -1
* + prot must have read and write
* + MAP_STACK implies MAP_ANON
* + MAP_STACK implies offset of 0
*/
if (flags & FREEBSD_MAP_STACK) {
if ((fd != -1)
||((prot & (PROT_READ|PROT_WRITE))!=(PROT_READ|PROT_WRITE)))
return (EINVAL);

flags |= (MAP_ANON | MAP_FIXED);
flags &= ~FREEBSD_MAP_STACK;

pos = 0;
}

SCARG(&bma, addr) = SCARG(uap, addr);
SCARG(&bma, len) = SCARG(uap, len);
SCARG(&bma, prot) = prot;
SCARG(&bma, flags) = flags;
SCARG(&bma, fd) = fd;
SCARG(&bma, pos) = pos;

return sys_mmap(l, &bma, retval);
}

/* just a place holder */

int
freebsd_sys_rtprio(struct lwp *l, const struct freebsd_sys_rtprio_args *uap, register_t *retval)
{
/* {
syscallarg(int) function;
syscallarg(pid_t) pid;
syscallarg(struct freebsd_rtprio *) rtp;
} */

return ENOSYS; /* XXX */
}

#ifdef NTP
int
freebsd_ntp_adjtime(struct lwp *l, const struct freebsd_ntp_adjtime_args *uap, register_t *retval)
{
/* {
syscallarg(struct freebsd_timex *) tp;
} */

return ENOSYS; /* XXX */
}
#endif

int
freebsd_sys_sigaction4(struct lwp *l, const struct freebsd_sys_sigaction4_args *uap, register_t *retval)
{
/* {
syscallarg(int) signum;
syscallarg(const struct freebsd_sigaction4 *) nsa;
syscallarg(struct freebsd_sigaction4 *) osa;
} */
struct freebsd_sigaction4 nesa, oesa;
struct sigaction nbsa, obsa;
int error;

if (SCARG(uap, nsa)) {
error = copyin(SCARG(uap, nsa), &nesa, sizeof(nesa));
if (error)
return (error);
nbsa.sa_handler = nesa.freebsd_sa_handler;
nbsa.sa_mask = nesa.freebsd_sa_mask;
nbsa.sa_flags = nesa.freebsd_sa_flags;
}
error = sigaction1(l, SCARG(uap, signum),
SCARG(uap, nsa) ? &nbsa : 0, SCARG(uap, osa) ? &obsa : 0,
NULL, 0);
if (error)
return (error);
if (SCARG(uap, osa)) {
memset(&oesa, 0, sizeof(oesa));
oesa.freebsd_sa_handler = obsa.sa_handler;
oesa.freebsd_sa_mask = obsa.sa_mask;
oesa.freebsd_sa_flags = obsa.sa_flags;
error = copyout(&oesa, SCARG(uap, osa), sizeof(oesa));
if (error)
return (error);
}
return (0);
}

int
freebsd_sys_utrace(struct lwp *l, const struct freebsd_sys_utrace_args *uap, register_t *retval)
{
/* {
syscallarg(void *) addr;
syscallarg(size_t) len;
} */

return ktruser("FreeBSD utrace", SCARG(uap, addr), SCARG(uap, len),
0);
}