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 49struct uvm_object *emul_netbsd32_object; 50 51static 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 58static int 59compat_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 84static int 85compat_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 121MODULE(MODULE_CLASS_EXEC, compat_netbsd32_16, "compat_netbsd32_20,compat_16"); 122 123static int 124compat_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