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      1 /*	$NetBSD: netbsd32_compat_16.c,v 1.10 2025/02/28 18:35:44 wiz 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 1.10 2025/02/28 18:35:44 wiz 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 #if defined(__amd64__) || defined(__arm__) || defined(__mips__) || defined(__sparc64__)
     52 #define __HAVE_MD_NETBSD32_SIGRETURN14
     53 #endif
     54 
     55 #if defined(__amd64__) || defined(__arm__) || defined(__mips__) || defined(__powerpc__) || defined(__riscv__)
     56 #define __HAVE_MD_NETBSD32_SIGCODE
     57 #endif
     58 
     59 
     60 #ifdef __HAVE_MD_NETBSD32_SIGRETURN14
     61 static const struct syscall_package netbsd32_kern_sig_16_syscalls[] = {
     62         /* compat_16_netbsd32___sigreturn14 is in MD code! */
     63         { NETBSD32_SYS_compat_16_netbsd32___sigreturn14, 0,
     64             (sy_call_t *)compat_16_netbsd32___sigreturn14 },
     65         { 0, 0, NULL }
     66 };
     67 #endif
     68 
     69 static int
     70 compat_netbsd32_16_init(void)
     71 {
     72 #if defined(__HAVE_MD_NETBSD32_SIGRETURN14) || defined(__HAVE_MD_NETBSD32_SIGCODE)
     73 	int error;
     74 #endif
     75 
     76 #ifdef __HAVE_MD_NETBSD32_SIGRETURN14
     77 	error = syscall_establish(&emul_netbsd32,
     78 	    netbsd32_kern_sig_16_syscalls);
     79 	if (error)
     80 		return error;
     81 #endif
     82 
     83 #ifdef __HAVE_MD_NETBSD32_SIGCODE
     84 	rw_enter(&exec_lock, RW_WRITER);
     85 	emul_netbsd32.e_sigcode = netbsd32_sigcode;
     86 	emul_netbsd32.e_esigcode = netbsd32_esigcode;
     87 	emul_netbsd32.e_sigobject = &emul_netbsd32_object;
     88 	error = exec_sigcode_alloc(&emul_netbsd);
     89 	if (error) {
     90 		emul_netbsd32.e_sigcode = NULL;
     91 		emul_netbsd32.e_esigcode = NULL;
     92 		emul_netbsd32.e_sigobject = NULL;
     93 	}
     94 	rw_exit(&exec_lock);
     95 	if (error)
     96 		return error;
     97 	netbsd32_machdep_md_16_init();
     98 #endif
     99 	return 0;
    100 }
    101 
    102 static int
    103 compat_netbsd32_16_fini(void)
    104 {
    105 #if defined(__HAVE_MD_NETBSD32_SIGRETURN14)
    106 	proc_t *p;
    107 	int error;
    108 #endif
    109 
    110 #ifdef __HAVE_MD_NETBSD32_SIGRETURN14
    111 	error = syscall_disestablish(&emul_netbsd32,
    112 	    netbsd32_kern_sig_16_syscalls);
    113 	if (error)
    114 		return error;
    115 	/*
    116 	 * Ensure sendsig_sigcontext() is not being used.
    117 	 * module_lock prevents the flag being set on any
    118 	 * further processes while we are here.  See
    119 	 * sigaction1() for the opposing half.
    120 	 */
    121 	mutex_enter(&proc_lock);
    122 	PROCLIST_FOREACH(p, &allproc) {
    123 		if ((p->p_lflag & PL_SIGCOMPAT) != 0) {
    124 			break;
    125 		}
    126 	}
    127 	mutex_exit(&proc_lock);
    128 	if (p != NULL) {
    129 		syscall_establish(&emul_netbsd32,
    130 		    netbsd32_kern_sig_16_syscalls);
    131 		return EBUSY;
    132 	}
    133 #endif
    134 
    135 #ifdef __HAVE_MD_NETBSD32_SIGCODE
    136 	rw_enter(&exec_lock, RW_WRITER);
    137 	exec_sigcode_free(&emul_netbsd);
    138 	emul_netbsd32.e_sigcode = NULL;
    139 	emul_netbsd32.e_esigcode = NULL;
    140 	emul_netbsd32.e_sigobject = NULL;
    141 	rw_exit(&exec_lock);
    142 	netbsd32_machdep_md_16_fini();
    143 #endif
    144 	return 0;
    145 }
    146 
    147 MODULE(MODULE_CLASS_EXEC, compat_netbsd32_16, "compat_netbsd32_20,compat_16");
    148 
    149 static int
    150 compat_netbsd32_16_modcmd(modcmd_t cmd, void *arg)
    151 {
    152 	switch (cmd) {
    153 	case MODULE_CMD_INIT:
    154 		return compat_netbsd32_16_init();
    155 
    156 	case MODULE_CMD_FINI:
    157 		return compat_netbsd32_16_fini();
    158 
    159 	default:
    160 		return ENOTTY;
    161 	}
    162 }
    163