| 1 | /* $NetBSD: linux_exec.c,v 1.117 2014/11/09 17:48:08 maxv 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 1.117 2014/11/09 17:48:08 maxv 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_tracesig = NULL, |
| 96 | .e_sigcode = linux_sigcode, |
| 97 | .e_esigcode = linux_esigcode, |
| 98 | .e_sigobject = &emul_linux_object, |
| 99 | .e_setregs = linux_setregs, |
| 100 | .e_proc_exec = linux_e_proc_exec, |
| 101 | .e_proc_fork = linux_e_proc_fork, |
| 102 | .e_proc_exit = linux_e_proc_exit, |
| 103 | .e_lwp_fork = linux_e_lwp_fork, |
| 104 | .e_lwp_exit = linux_e_lwp_exit, |
| 105 | #ifdef __HAVE_SYSCALL_INTERN |
| 106 | .e_syscall_intern = linux_syscall_intern, |
| 107 | #else |
| 108 | #error Implement __HAVE_SYSCALL_INTERN for this platform |
| 109 | #endif |
| 110 | .e_sysctlovly = NULL, |
| 111 | .e_fault = NULL, |
| 112 | .e_vm_default_addr = uvm_default_mapaddr, |
| 113 | .e_usertrap = linux_usertrap, |
| 114 | .e_ucsize = 0, |
| 115 | .e_startlwp = NULL |
| 116 | }; |
| 117 | |
| 118 | void |
| 119 | linux_e_proc_exec(struct proc *p, struct exec_package *epp) |
| 120 | { |
| 121 | struct lwp *l; |
| 122 | |
| 123 | l = LIST_FIRST(&p->p_lwps); |
| 124 | if (l->l_emuldata == NULL) { |
| 125 | l->l_emuldata = kmem_zalloc(sizeof(struct linux_emuldata), KM_SLEEP); |
| 126 | } else { |
| 127 | memset(l->l_emuldata, 0, sizeof (struct linux_emuldata)); |
| 128 | } |
| 129 | |
| 130 | KASSERT(p->p_nlwps == 1); |
| 131 | l = LIST_FIRST(&p->p_lwps); |
| 132 | mutex_enter(p->p_lock); |
| 133 | l->l_lid = p->p_pid; |
| 134 | mutex_exit(p->p_lock); |
| 135 | } |
| 136 | |
| 137 | void |
| 138 | linux_e_proc_exit(struct proc *p) |
| 139 | { |
| 140 | struct lwp *l; |
| 141 | |
| 142 | KASSERT(p->p_nlwps == 1); |
| 143 | l = LIST_FIRST(&p->p_lwps); |
| 144 | linux_e_lwp_exit(l); |
| 145 | } |
| 146 | |
| 147 | void |
| 148 | linux_e_proc_fork(struct proc *p2, struct lwp *l1, int flags) |
| 149 | { |
| 150 | struct linux_emuldata *led1, *led2; |
| 151 | struct lwp *l2; |
| 152 | |
| 153 | KASSERT(p2->p_nlwps == 1); |
| 154 | l2 = LIST_FIRST(&p2->p_lwps); |
| 155 | l2->l_lid = p2->p_pid; |
| 156 | led1 = l1->l_emuldata; |
| 157 | led2 = l2->l_emuldata; |
| 158 | led2->led_child_tidptr = led1->led_child_tidptr; |
| 159 | } |
| 160 | |
| 161 | void |
| 162 | linux_e_lwp_fork(struct lwp *l1, struct lwp *l2) |
| 163 | { |
| 164 | struct linux_emuldata *led2; |
| 165 | |
| 166 | led2 = kmem_zalloc(sizeof(*led2), KM_SLEEP); |
| 167 | l2->l_emuldata = led2; |
| 168 | } |
| 169 | |
| 170 | void |
| 171 | linux_e_lwp_exit(struct lwp *l) |
| 172 | { |
| 173 | struct linux_emuldata *led; |
| 174 | struct linux_sys_futex_args cup; |
| 175 | register_t retval; |
| 176 | int error, zero = 0; |
| 177 | |
| 178 | led = l->l_emuldata; |
| 179 | if (led->led_clear_tid == NULL) { |
| 180 | return; |
| 181 | } |
| 182 | |
| 183 | /* Emulate LINUX_CLONE_CHILD_CLEARTID */ |
| 184 | error = copyout(&zero, led->led_clear_tid, sizeof(zero)); |
| 185 | #ifdef DEBUG_LINUX |
| 186 | if (error != 0) |
| 187 | printf("%s: cannot clear TID\n" , __func__); |
| 188 | #endif |
| 189 | |
| 190 | SCARG(&cup, uaddr) = led->led_clear_tid; |
| 191 | SCARG(&cup, op) = LINUX_FUTEX_WAKE; |
| 192 | SCARG(&cup, val) = 0x7fffffff; /* Awake everyone */ |
| 193 | SCARG(&cup, timeout) = NULL; |
| 194 | SCARG(&cup, uaddr2) = NULL; |
| 195 | SCARG(&cup, val3) = 0; |
| 196 | if ((error = linux_sys_futex(curlwp, &cup, &retval)) != 0) |
| 197 | printf("%s: linux_sys_futex failed\n" , __func__); |
| 198 | |
| 199 | release_futexes(l); |
| 200 | |
| 201 | led = l->l_emuldata; |
| 202 | l->l_emuldata = NULL; |
| 203 | kmem_free(led, sizeof(*led)); |
| 204 | } |
| 205 | |