1/* $NetBSD: linux_exec.c,v 1.124 2020/05/03 01:06:56 thorpej Exp $ */ 2 3/*- 4 * Copyright (c) 1994, 1995, 1998, 2000, 2007, 2008, 2020 5 * The NetBSD Foundation, Inc. 6 * All rights reserved. 7 * 8 * This code is derived from software contributed to The NetBSD Foundation 9 * by Christos Zoulas, Frank van der Linden, Eric Haszlakiewicz and 10 * Thor Lancelot Simon. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 23 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 24 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 25 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 26 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 30 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 31 * POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34#include <sys/cdefs.h> 35__KERNEL_RCSID(0, "$NetBSD: linux_exec.c,v 1.124 2020/05/03 01:06:56 thorpej Exp $"); 36 37#include <sys/param.h> 38#include <sys/systm.h> 39#include <sys/kernel.h> 40#include <sys/lwp.h> 41#include <sys/proc.h> 42#include <sys/namei.h> 43#include <sys/vnode.h> 44#include <sys/mount.h> 45#include <sys/exec.h> 46#include <sys/exec_elf.h> 47#include <sys/futex.h> 48 49#include <sys/mman.h> 50#include <sys/syscallargs.h> 51 52#include <sys/ptrace.h> /* For proc_reparent() */ 53 54#include <uvm/uvm_extern.h> 55 56#include <sys/cpu.h> 57#include <machine/reg.h> 58 59#include <compat/linux/common/linux_types.h> 60#include <compat/linux/common/linux_signal.h> 61#include <compat/linux/common/linux_util.h> 62#include <compat/linux/common/linux_sched.h> 63#include <compat/linux/common/linux_machdep.h> 64#include <compat/linux/common/linux_misc.h> 65#include <compat/linux/common/linux_exec.h> 66#include <compat/linux/common/linux_ipc.h> 67#include <compat/linux/common/linux_sem.h> 68 69#include <compat/linux/linux_syscallargs.h> 70#include <compat/linux/linux_syscall.h> 71#include <compat/linux/common/linux_misc.h> 72#include <compat/linux/common/linux_errno.h> 73#include <compat/linux/common/linux_emuldata.h> 74 75extern struct sysent linux_sysent[]; 76extern const uint32_t linux_sysent_nomodbits[]; 77extern const char * const linux_syscallnames[]; 78extern char linux_sigcode[], linux_esigcode[]; 79 80/* 81 * Emulation switch. 82 */ 83 84struct uvm_object *emul_linux_object; 85 86struct emul emul_linux = { 87 .e_name = "linux", 88 .e_path = "/emul/linux", 89#ifndef __HAVE_MINIMAL_EMUL 90 .e_flags = 0, 91 .e_errno = native_to_linux_errno, 92 .e_nosys = LINUX_SYS_syscall, 93 .e_nsysent = LINUX_SYS_NSYSENT, 94#endif 95 .e_sysent = linux_sysent, 96 .e_nomodbits = linux_sysent_nomodbits, 97 .e_syscallnames = linux_syscallnames, 98 .e_sendsig = linux_sendsig, 99 .e_trapsignal = linux_trapsignal, 100 .e_sigcode = linux_sigcode, 101 .e_esigcode = linux_esigcode, 102 .e_sigobject = &emul_linux_object, 103 .e_setregs = linux_setregs, 104 .e_proc_exec = linux_e_proc_exec, 105 .e_proc_fork = linux_e_proc_fork, 106 .e_proc_exit = linux_e_proc_exit, 107 .e_lwp_fork = linux_e_lwp_fork, 108 .e_lwp_exit = linux_e_lwp_exit, 109#ifdef __HAVE_SYSCALL_INTERN 110 .e_syscall_intern = linux_syscall_intern, 111#else 112#error Implement __HAVE_SYSCALL_INTERN for this platform 113#endif 114 .e_sysctlovly = NULL, 115 .e_vm_default_addr = uvm_default_mapaddr, 116 .e_usertrap = linux_usertrap, 117 .e_ucsize = 0, 118 .e_startlwp = NULL 119}; 120 121void 122linux_e_proc_exec(struct proc *p, struct exec_package *epp) 123{ 124 struct lwp *l; 125 126 l = LIST_FIRST(&p->p_lwps); 127 if (l->l_emuldata == NULL) { 128 l->l_emuldata = kmem_zalloc(sizeof(struct linux_emuldata), KM_SLEEP); 129 } else { 130 memset(l->l_emuldata, 0, sizeof (struct linux_emuldata)); 131 } 132 133 KASSERT(p->p_nlwps == 1); 134} 135 136void 137linux_e_proc_exit(struct proc *p) 138{ 139 struct lwp *l; 140 141 KASSERT(p->p_nlwps == 1); 142 l = LIST_FIRST(&p->p_lwps); 143 linux_e_lwp_exit(l); 144} 145 146void 147linux_e_proc_fork(struct proc *p2, struct lwp *l1, int flags) 148{ 149 struct linux_emuldata *led1, *led2; 150 struct lwp *l2; 151 152 KASSERT(p2->p_nlwps == 1); 153 l2 = LIST_FIRST(&p2->p_lwps); 154 led1 = l1->l_emuldata; 155 led2 = l2->l_emuldata; 156 led2->led_child_tidptr = led1->led_child_tidptr; 157} 158 159void 160linux_e_lwp_fork(struct lwp *l1, struct lwp *l2) 161{ 162 struct linux_emuldata *led2; 163 164 led2 = kmem_zalloc(sizeof(*led2), KM_SLEEP); 165 l2->l_emuldata = led2; 166} 167 168void 169linux_e_lwp_exit(struct lwp *l) 170{ 171 struct linux_emuldata *led; 172 register_t retval; 173 int error, zero = 0; 174 175 led = l->l_emuldata; 176 177 if (led->led_clear_tid != NULL) { 178 /* Emulate LINUX_CLONE_CHILD_CLEARTID */ 179 error = copyout(&zero, led->led_clear_tid, sizeof(zero)); 180#ifdef DEBUG_LINUX 181 if (error != 0) 182 printf("%s: cannot clear TID\n", __func__); 183#endif 184 185 error = linux_do_futex((int *)led->led_clear_tid, FUTEX_WAKE, 186 INT_MAX, NULL, NULL, 0, 0, &retval); 187 if (error) 188 printf("%s: linux_sys_futex failed\n", __func__); 189 } 190 191 led = l->l_emuldata; 192 l->l_emuldata = NULL; 193 kmem_free(led, sizeof(*led)); 194} 195