linux_exec.c revision 1.118.2.1
1 /* $NetBSD: linux_exec.c,v 1.118.2.1 2018/05/21 04:36:03 pgoyette Exp $ */ 2 3 /*- 4 * Copyright (c) 1994, 1995, 1998, 2000, 2007, 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, Frank van der Linden, Eric Haszlakiewicz and 9 * Thor Lancelot Simon. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 #include <sys/cdefs.h> 34 __KERNEL_RCSID(0, "$NetBSD: linux_exec.c,v 1.118.2.1 2018/05/21 04:36:03 pgoyette Exp $"); 35 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/kernel.h> 39 #include <sys/proc.h> 40 #include <sys/namei.h> 41 #include <sys/vnode.h> 42 #include <sys/mount.h> 43 #include <sys/exec.h> 44 #include <sys/exec_elf.h> 45 46 #include <sys/mman.h> 47 #include <sys/syscallargs.h> 48 49 #include <sys/ptrace.h> /* For proc_reparent() */ 50 51 #include <uvm/uvm_extern.h> 52 53 #include <sys/cpu.h> 54 #include <machine/reg.h> 55 56 #include <compat/linux/common/linux_types.h> 57 #include <compat/linux/common/linux_signal.h> 58 #include <compat/linux/common/linux_util.h> 59 #include <compat/linux/common/linux_sched.h> 60 #include <compat/linux/common/linux_machdep.h> 61 #include <compat/linux/common/linux_exec.h> 62 #include <compat/linux/common/linux_futex.h> 63 #include <compat/linux/common/linux_ipc.h> 64 #include <compat/linux/common/linux_sem.h> 65 66 #include <compat/linux/linux_syscallargs.h> 67 #include <compat/linux/linux_syscall.h> 68 #include <compat/linux/common/linux_misc.h> 69 #include <compat/linux/common/linux_errno.h> 70 #include <compat/linux/common/linux_emuldata.h> 71 72 extern struct sysent linux_sysent[]; 73 extern const char * const linux_syscallnames[]; 74 extern char linux_sigcode[], linux_esigcode[]; 75 76 /* 77 * Emulation switch. 78 */ 79 80 struct uvm_object *emul_linux_object; 81 82 struct emul emul_linux = { 83 .e_name = "linux", 84 .e_path = "/emul/linux", 85 #ifndef __HAVE_MINIMAL_EMUL 86 .e_flags = 0, 87 .e_errno = native_to_linux_errno, 88 .e_nosys = LINUX_SYS_syscall, 89 .e_nsysent = LINUX_SYS_NSYSENT, 90 #endif 91 .e_sysent = linux_sysent, 92 .e_syscallnames = linux_syscallnames, 93 .e_sendsig = linux_sendsig, 94 .e_trapsignal = linux_trapsignal, 95 .e_sigcode = linux_sigcode, 96 .e_esigcode = linux_esigcode, 97 .e_sigobject = &emul_linux_object, 98 .e_setregs = linux_setregs, 99 .e_proc_exec = linux_e_proc_exec, 100 .e_proc_fork = linux_e_proc_fork, 101 .e_proc_exit = linux_e_proc_exit, 102 .e_lwp_fork = linux_e_lwp_fork, 103 .e_lwp_exit = linux_e_lwp_exit, 104 #ifdef __HAVE_SYSCALL_INTERN 105 .e_syscall_intern = linux_syscall_intern, 106 #else 107 #error Implement __HAVE_SYSCALL_INTERN for this platform 108 #endif 109 .e_sysctlovly = NULL, 110 .e_vm_default_addr = uvm_default_mapaddr, 111 .e_usertrap = linux_usertrap, 112 .e_ucsize = 0, 113 .e_startlwp = NULL 114 }; 115 116 void 117 linux_e_proc_exec(struct proc *p, struct exec_package *epp) 118 { 119 struct lwp *l; 120 121 l = LIST_FIRST(&p->p_lwps); 122 if (l->l_emuldata == NULL) { 123 l->l_emuldata = kmem_zalloc(sizeof(struct linux_emuldata), KM_SLEEP); 124 } else { 125 memset(l->l_emuldata, 0, sizeof (struct linux_emuldata)); 126 } 127 128 KASSERT(p->p_nlwps == 1); 129 l = LIST_FIRST(&p->p_lwps); 130 mutex_enter(p->p_lock); 131 l->l_lid = p->p_pid; 132 mutex_exit(p->p_lock); 133 } 134 135 void 136 linux_e_proc_exit(struct proc *p) 137 { 138 struct lwp *l; 139 140 KASSERT(p->p_nlwps == 1); 141 l = LIST_FIRST(&p->p_lwps); 142 linux_e_lwp_exit(l); 143 } 144 145 void 146 linux_e_proc_fork(struct proc *p2, struct lwp *l1, int flags) 147 { 148 struct linux_emuldata *led1, *led2; 149 struct lwp *l2; 150 151 KASSERT(p2->p_nlwps == 1); 152 l2 = LIST_FIRST(&p2->p_lwps); 153 l2->l_lid = p2->p_pid; 154 led1 = l1->l_emuldata; 155 led2 = l2->l_emuldata; 156 led2->led_child_tidptr = led1->led_child_tidptr; 157 } 158 159 void 160 linux_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 } 167 168 void 169 linux_e_lwp_exit(struct lwp *l) 170 { 171 struct linux_emuldata *led; 172 struct linux_sys_futex_args cup; 173 register_t retval; 174 int error, zero = 0; 175 176 led = l->l_emuldata; 177 if (led->led_clear_tid == NULL) { 178 return; 179 } 180 181 /* Emulate LINUX_CLONE_CHILD_CLEARTID */ 182 error = copyout(&zero, led->led_clear_tid, sizeof(zero)); 183 #ifdef DEBUG_LINUX 184 if (error != 0) 185 printf("%s: cannot clear TID\n", __func__); 186 #endif 187 188 SCARG(&cup, uaddr) = led->led_clear_tid; 189 SCARG(&cup, op) = LINUX_FUTEX_WAKE; 190 SCARG(&cup, val) = 0x7fffffff; /* Awake everyone */ 191 SCARG(&cup, timeout) = NULL; 192 SCARG(&cup, uaddr2) = NULL; 193 SCARG(&cup, val3) = 0; 194 if ((error = linux_sys_futex(curlwp, &cup, &retval)) != 0) 195 printf("%s: linux_sys_futex failed\n", __func__); 196 197 release_futexes(l); 198 199 led = l->l_emuldata; 200 l->l_emuldata = NULL; 201 kmem_free(led, sizeof(*led)); 202 } 203
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