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netbsd32_compat_16.c revision 1.5 
      1 /*	$NetBSD: netbsd32_compat_16.c,v 1.5 2024/05/01 11:32:29 mlelstv Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2008 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Christos Zoulas.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 #include <sys/cdefs.h>
     32 __KERNEL_RCSID(0, "$NetBSD: netbsd32_compat_16.c,v 1.5 2024/05/01 11:32:29 mlelstv Exp $");
     33 
     34 #include <sys/param.h>
     35 #include <sys/systm.h>
     36 #include <sys/module.h>
     37 #include <sys/dirent.h>
     38 #include <sys/exec.h>
     39 #include <sys/proc.h>
     40 #include <sys/lwp.h>
     41 #include <sys/syscallargs.h>
     42 #include <sys/syscallvar.h>
     43 
     44 #include <compat/netbsd32/netbsd32.h>
     45 #include <compat/netbsd32/netbsd32_syscall.h>
     46 #include <compat/netbsd32/netbsd32_syscallargs.h>
     47 #include <compat/netbsd32/netbsd32_conv.h>
     48 
     49 struct uvm_object *emul_netbsd32_object;
     50 
     51 static const struct syscall_package netbsd32_kern_sig_16_syscalls[] = {
     52         /* compat_16_netbs32___sigreturn14 is in MD code! */
     53         { NETBSD32_SYS_compat_16_netbsd32___sigreturn14, 0,
     54             (sy_call_t *)compat_16_netbsd32___sigreturn14 },
     55         { 0, 0, NULL }
     56 };
     57 
     58 static int
     59 compat_netbsd32_16_init(void)
     60 {
     61 	int error;
     62 
     63 	error = syscall_establish(&emul_netbsd32, netbsd32_kern_sig_16_syscalls);
     64 	if (error)
     65 		return error;
     66 
     67 	rw_enter(&exec_lock, RW_WRITER);
     68 	emul_netbsd32.e_sigcode = netbsd32_sigcode;
     69 	emul_netbsd32.e_esigcode = netbsd32_esigcode;
     70 	emul_netbsd32.e_sigobject = &emul_netbsd32_object;
     71 	error = exec_sigcode_alloc(&emul_netbsd);
     72 	if (error) {
     73 		emul_netbsd32.e_sigcode = NULL;
     74 		emul_netbsd32.e_esigcode = NULL;
     75 		emul_netbsd32.e_sigobject = NULL;
     76 	}
     77 	rw_exit(&exec_lock);
     78 	if (error)
     79 		return error;
     80 	netbsd32_machdep_md_16_init();
     81 	return 0;
     82 }
     83 
     84 static int
     85 compat_netbsd32_16_fini(void)
     86 {
     87 	proc_t *p;
     88 	int error;
     89 
     90 	error = syscall_disestablish(&emul_netbsd32, netbsd32_kern_sig_16_syscalls);
     91         if (error)
     92                 return error;
     93         /*
     94          * Ensure sendsig_sigcontext() is not being used.
     95          * module_lock prevents the flag being set on any
     96          * further processes while we are here.  See
     97          * sigaction1() for the opposing half.
     98          */
     99         mutex_enter(&proc_lock);
    100         PROCLIST_FOREACH(p, &allproc) {
    101                 if ((p->p_lflag & PL_SIGCOMPAT) != 0) {
    102                         break;
    103                 }
    104         }
    105         mutex_exit(&proc_lock);
    106         if (p != NULL) {
    107                 syscall_establish(&emul_netbsd32, netbsd32_kern_sig_16_syscalls);
    108                 return EBUSY;
    109         }
    110 
    111 	rw_enter(&exec_lock, RW_WRITER);
    112 	exec_sigcode_free(&emul_netbsd);
    113 	emul_netbsd32.e_sigcode = NULL;
    114        	emul_netbsd32.e_esigcode = NULL;
    115        	emul_netbsd32.e_sigobject = NULL;
    116 	rw_exit(&exec_lock);
    117 	netbsd32_machdep_md_16_fini();
    118 	return 0;
    119 }
    120 
    121 MODULE(MODULE_CLASS_EXEC, compat_netbsd32_16, "compat_netbsd32_20,compat_16");
    122 
    123 static int
    124 compat_netbsd32_16_modcmd(modcmd_t cmd, void *arg)
    125 {
    126 	switch (cmd) {
    127 	case MODULE_CMD_INIT:
    128 		return compat_netbsd32_16_init();
    129 
    130 	case MODULE_CMD_FINI:
    131 		return compat_netbsd32_16_fini();
    132 
    133 	default:
    134 		return ENOTTY;
    135 	}
    136 }
    137