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netbsd32_compat_16.c revision 1.6 
      1 /*	$NetBSD: netbsd32_compat_16.c,v 1.6 2024/08/18 18:42:57 riastradh 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 1.6 2024/08/18 18:42:57 riastradh 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,
     64 	    netbsd32_kern_sig_16_syscalls);
     65 	if (error)
     66 		return error;
     67 
     68 	rw_enter(&exec_lock, RW_WRITER);
     69 	emul_netbsd32.e_sigcode = netbsd32_sigcode;
     70 	emul_netbsd32.e_esigcode = netbsd32_esigcode;
     71 	emul_netbsd32.e_sigobject = &emul_netbsd32_object;
     72 	error = exec_sigcode_alloc(&emul_netbsd);
     73 	if (error) {
     74 		emul_netbsd32.e_sigcode = NULL;
     75 		emul_netbsd32.e_esigcode = NULL;
     76 		emul_netbsd32.e_sigobject = NULL;
     77 	}
     78 	rw_exit(&exec_lock);
     79 	if (error)
     80 		return error;
     81 	netbsd32_machdep_md_16_init();
     82 	return 0;
     83 }
     84 
     85 static int
     86 compat_netbsd32_16_fini(void)
     87 {
     88 	proc_t *p;
     89 	int error;
     90 
     91 	error = syscall_disestablish(&emul_netbsd32,
     92 	    netbsd32_kern_sig_16_syscalls);
     93 	if (error)
     94 		return error;
     95 	/*
     96 	 * Ensure sendsig_sigcontext() is not being used.
     97 	 * module_lock prevents the flag being set on any
     98 	 * further processes while we are here.  See
     99 	 * sigaction1() for the opposing half.
    100 	 */
    101 	mutex_enter(&proc_lock);
    102 	PROCLIST_FOREACH(p, &allproc) {
    103 		if ((p->p_lflag & PL_SIGCOMPAT) != 0) {
    104 			break;
    105 		}
    106 	}
    107 	mutex_exit(&proc_lock);
    108 	if (p != NULL) {
    109 		syscall_establish(&emul_netbsd32,
    110 		    netbsd32_kern_sig_16_syscalls);
    111 		return EBUSY;
    112 	}
    113 
    114 	rw_enter(&exec_lock, RW_WRITER);
    115 	exec_sigcode_free(&emul_netbsd);
    116 	emul_netbsd32.e_sigcode = NULL;
    117 	emul_netbsd32.e_esigcode = NULL;
    118 	emul_netbsd32.e_sigobject = NULL;
    119 	rw_exit(&exec_lock);
    120 	netbsd32_machdep_md_16_fini();
    121 	return 0;
    122 }
    123 
    124 MODULE(MODULE_CLASS_EXEC, compat_netbsd32_16, "compat_netbsd32_20,compat_16");
    125 
    126 static int
    127 compat_netbsd32_16_modcmd(modcmd_t cmd, void *arg)
    128 {
    129 	switch (cmd) {
    130 	case MODULE_CMD_INIT:
    131 		return compat_netbsd32_16_init();
    132 
    133 	case MODULE_CMD_FINI:
    134 		return compat_netbsd32_16_fini();
    135 
    136 	default:
    137 		return ENOTTY;
    138 	}
    139 }
    140