/*      $NetBSD: kern_sig_16.c,v 1.10 2024/12/10 10:52:05 mlelstv Exp $ */

/*-
* Copyright (c) 2006, 2007, 2008 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Andrew Doran.
*
* 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.
*
* 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.
*/

/*
* Copyright (c) 1982, 1986, 1989, 1991, 1993
*      The Regents of the University of California.  All rights reserved.
* (c) UNIX System Laboratories, Inc.
* All or some portions of this file are derived from material licensed
* to the University of California by American Telephone and Telegraph
* Co. or Unix System Laboratories, Inc. and are reproduced herein with
* the permission of UNIX System Laboratories, Inc.
*
* 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. Neither the name of the University 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 REGENTS 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 REGENTS 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.
*
*      @(#)kern_sig.c  8.14 (Berkeley) 5/14/95
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: kern_sig_16.c,v 1.10 2024/12/10 10:52:05 mlelstv Exp $");

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

#include <sys/param.h>
#include <sys/exec.h>
#include <sys/kernel.h>
#include <sys/rwlock.h>
#include <sys/signalvar.h>
#include <sys/proc.h>
#include <sys/pool.h>
#include <sys/syscall.h>
#include <sys/syscallvar.h>
#include <sys/syscallargs.h>
#include <sys/kauth.h>
#include <sys/wait.h>
#include <sys/kmem.h>
#include <sys/compat_stub.h>

#include <uvm/uvm_object.h>
#include <uvm/uvm_prot.h>
#include <uvm/uvm_pager.h>

#include <compat/common/compat_mod.h>

#ifdef COMPAT_NETBSD32
# ifndef __aarch64__
#  define COMPAT_SIGCONTEXT
# endif
#else /* COMPAT_NETBSD32 */
# if !defined(__amd64__) && !defined(__aarch64__)
#  define COMPAT_SIGCONTEXT
# endif
#endif /* COMPAT_NETBSD32 */

#ifdef COMPAT_SIGCONTEXT
extern char sigcode[], esigcode[];
struct uvm_object *emul_netbsd_object;
#endif

static const struct syscall_package kern_sig_16_syscalls[] = {
#ifdef COMPAT_SIGCONTEXT
       { SYS_compat_16___sigaction14, 0,
           (sy_call_t *)compat_16_sys___sigaction14 },
       /* compat_16_sigreturn14 is in MD code! */
       { SYS_compat_16___sigreturn14, 0,
           (sy_call_t *)compat_16_sys___sigreturn14 },
#endif
       { 0, 0, NULL }
};

int
compat_16_sys___sigaction14(struct lwp *l,
   const struct compat_16_sys___sigaction14_args *uap, register_t *retval)
{
       /* {
               syscallarg(int)                         signum;
               syscallarg(const struct sigaction *)    nsa;
               syscallarg(struct sigaction *)          osa;
       } */
       struct sigaction        nsa, osa;
       int                     error;

       if (SCARG(uap, nsa)) {
               error = copyin(SCARG(uap, nsa), &nsa, sizeof(nsa));
               if (error)
                       return (error);
       }
       error = sigaction1(l, SCARG(uap, signum),
           SCARG(uap, nsa) ? &nsa : 0, SCARG(uap, osa) ? &osa : 0,
           NULL, 0);
       if (error)
               return (error);
       if (SCARG(uap, osa)) {
               error = copyout(&osa, SCARG(uap, osa), sizeof(osa));
               if (error)
                       return (error);
       }
       return (0);
}

int
kern_sig_16_init(void)
{
       int error;

       error = syscall_establish(NULL, kern_sig_16_syscalls);
       if (error)
               return error;
#if defined(COMPAT_SIGCONTEXT)
       KASSERT(emul_netbsd.e_sigobject == NULL);
       rw_enter(&exec_lock, RW_WRITER);
       emul_netbsd.e_sigcode = sigcode;
       emul_netbsd.e_esigcode = esigcode;
       emul_netbsd.e_sigobject = &emul_netbsd_object;
       error = exec_sigcode_alloc(&emul_netbsd);
       if (error) {
               emul_netbsd.e_sigcode = NULL;
               emul_netbsd.e_esigcode = NULL;
               emul_netbsd.e_sigobject = NULL;
       }
       rw_exit(&exec_lock);
       if (error)
               return error;
       MODULE_HOOK_SET(sendsig_sigcontext_16_hook, sendsig_sigcontext);
#endif

       return 0;
}

int
kern_sig_16_fini(void)
{
       proc_t *p;
       int error;

       error = syscall_disestablish(NULL, kern_sig_16_syscalls);
       if (error)
               return error;
       /*
        * Ensure sendsig_sigcontext() is not being used.
        * module_lock prevents the flag being set on any
        * further processes while we are here.  See
        * sigaction1() for the opposing half.
        */
       mutex_enter(&proc_lock);
       PROCLIST_FOREACH(p, &allproc) {
               if ((p->p_lflag & PL_SIGCOMPAT) != 0) {
                       break;
               }
       }
       mutex_exit(&proc_lock);
       if (p != NULL) {
               syscall_establish(NULL, kern_sig_16_syscalls);
               return EBUSY;
       }

#if defined(COMPAT_SIGCONTEXT)
       /*
        * The sigobject may persist if still in use, but
        * is reference counted so will die eventually.
        */
       rw_enter(&exec_lock, RW_WRITER);
       exec_sigcode_free(&emul_netbsd);
       emul_netbsd_object = NULL;
       emul_netbsd.e_sigcode = NULL;
       emul_netbsd.e_esigcode = NULL;
       emul_netbsd.e_sigobject = NULL;
       rw_exit(&exec_lock);

       MODULE_HOOK_UNSET(sendsig_sigcontext_16_hook);
#endif
       return 0;
}

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