1 /* $NetBSD: linux32_exec.c,v 1.14 2008/09/05 13:37:25 tron Exp $ */ 2 3 /*- 4 * Copyright (c) 1994-2007 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, 9 * Thor Lancelot Simon, and Emmanuel Dreyfus. 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: linux32_exec.c,v 1.14 2008/09/05 13:37:25 tron 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/malloc.h> 41 #include <sys/namei.h> 42 #include <sys/vnode.h> 43 #include <sys/mount.h> 44 #include <sys/exec.h> 45 #include <sys/exec_elf.h> 46 47 #include <sys/mman.h> 48 #include <sys/syscallargs.h> 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_emuldata.h> 58 59 #include <compat/linux32/common/linux32_exec.h> 60 #include <compat/linux32/common/linux32_types.h> 61 #include <compat/linux32/common/linux32_signal.h> 62 #include <compat/linux32/common/linux32_machdep.h> 63 64 #include <compat/linux32/linux32_syscallargs.h> 65 #include <compat/linux32/linux32_syscall.h> 66 67 extern char linux32_sigcode[1]; 68 extern char linux32_rt_sigcode[1]; 69 extern char linux32_esigcode[1]; 70 71 extern struct sysent linux32_sysent[]; 72 extern const char * const linux32_syscallnames[]; 73 74 static void linux32_e_proc_exec(struct proc *, struct exec_package *); 75 static void linux32_e_proc_fork(struct proc *, struct proc *, int); 76 static void linux32_e_proc_exit(struct proc *); 77 static void linux32_e_proc_init(struct proc *, struct proc *, int); 78 79 #ifdef LINUX32_NPTL 80 void linux32_userret(void); 81 void linux_nptl_proc_fork(struct proc *, struct proc *, void (*luserret)(void)); 82 void linux_nptl_proc_exit(struct proc *); 83 void linux_nptl_proc_init(struct proc *, struct proc *); 84 #endif 85 86 /* 87 * Emulation switch. 88 */ 89 90 struct uvm_object *emul_linux32_object; 91 92 const struct emul emul_linux32 = { 93 "linux32", 94 "/emul/linux32", 95 #ifndef __HAVE_MINIMAL_EMUL 96 0, 97 NULL, 98 LINUX32_SYS_syscall, 99 LINUX32_SYS_NSYSENT, 100 #endif 101 linux32_sysent, 102 linux32_syscallnames, 103 linux32_sendsig, 104 trapsignal, 105 NULL, 106 linux32_sigcode, 107 linux32_esigcode, 108 &emul_linux32_object, 109 linux32_setregs, 110 linux32_e_proc_exec, 111 linux32_e_proc_fork, 112 linux32_e_proc_exit, 113 NULL, 114 NULL, 115 linux32_syscall_intern, 116 NULL, 117 NULL, 118 netbsd32_vm_default_addr, 119 NULL, 120 0, 121 NULL 122 }; 123 124 static void 125 linux32_e_proc_init(p, parent, forkflags) 126 struct proc *p, *parent; 127 int forkflags; 128 { 129 struct linux_emuldata *e = p->p_emuldata; 130 struct linux_emuldata_shared *s; 131 struct linux_emuldata *ep = NULL; 132 133 if (!e) { 134 /* allocate new Linux emuldata */ 135 MALLOC(e, void *, sizeof(struct linux_emuldata), 136 M_EMULDATA, M_WAITOK); 137 } else { 138 mutex_enter(proc_lock); 139 e->s->refs--; 140 if (e->s->refs == 0) 141 FREE(e->s, M_EMULDATA); 142 mutex_exit(proc_lock); 143 } 144 145 memset(e, '\0', sizeof(struct linux_emuldata)); 146 147 e->proc = p; 148 149 if (parent) 150 ep = parent->p_emuldata; 151 152 if (forkflags & FORK_SHAREVM) { 153 mutex_enter(proc_lock); 154 #ifdef DIAGNOSTIC 155 if (ep == NULL) { 156 killproc(p, "FORK_SHAREVM while emuldata is NULL\n"); 157 mutex_exit(proc_lock); 158 return; 159 } 160 #endif 161 s = ep->s; 162 s->refs++; 163 } else { 164 struct vmspace *vm; 165 166 MALLOC(s, void *, sizeof(struct linux_emuldata_shared), 167 M_EMULDATA, M_WAITOK); 168 s->refs = 1; 169 170 /* 171 * Set the process idea of the break to the real value. 172 * For fork, we use parent's vmspace since our's 173 * is not setup at the time of this call and is going 174 * to be copy of parent's anyway. For exec, just 175 * use our own vmspace. 176 */ 177 vm = (parent) ? parent->p_vmspace : p->p_vmspace; 178 s->p_break = (char *)vm->vm_daddr + ctob(vm->vm_dsize); 179 180 /* 181 * Linux threads are emulated as NetBSD processes (not lwp) 182 * We use native PID for Linux TID. The Linux TID is the 183 * PID of the first process in the group. It is stored 184 * here 185 */ 186 s->group_pid = p->p_pid; 187 188 /* 189 * Initialize the list of threads in the group 190 */ 191 LIST_INIT(&s->threads); 192 193 s->xstat = 0; 194 s->flags = 0; 195 mutex_enter(proc_lock); 196 } 197 198 e->s = s; 199 200 /* 201 * Add this thread in the group thread list 202 */ 203 LIST_INSERT_HEAD(&s->threads, e, threads); 204 mutex_exit(proc_lock); 205 206 #ifdef LINUX32_NPTL 207 linux_nptl_proc_init(p, parent); 208 #endif /* LINUX32_NPTL */ 209 210 p->p_emuldata = e; 211 } 212 213 /* 214 * Allocate new per-process structures. Called when executing Linux 215 * process. We can reuse the old emuldata - if it's not null, 216 * the executed process is of same emulation as original forked one. 217 */ 218 static void 219 linux32_e_proc_exec(struct proc *p, struct exec_package *epp) 220 { 221 /* exec, use our vmspace */ 222 linux32_e_proc_init(p, NULL, 0); 223 } 224 225 /* 226 * Emulation per-process exit hook. 227 */ 228 static void 229 linux32_e_proc_exit(struct proc *p) 230 { 231 struct linux_emuldata *e = p->p_emuldata; 232 233 #ifdef LINUX32_NPTL 234 linux_nptl_proc_exit(p); 235 #endif /* LINUX32_NPTL */ 236 237 /* Remove the thread for the group thread list */ 238 mutex_enter(proc_lock); 239 LIST_REMOVE(e, threads); 240 241 /* free Linux emuldata and set the pointer to null */ 242 e->s->refs--; 243 if (e->s->refs == 0) 244 FREE(e->s, M_EMULDATA); 245 p->p_emuldata = NULL; 246 mutex_exit(proc_lock); 247 FREE(e, M_EMULDATA); 248 } 249 250 /* 251 * Emulation fork hook. 252 */ 253 static void 254 linux32_e_proc_fork(p, parent, forkflags) 255 struct proc *p, *parent; 256 int forkflags; 257 { 258 /* 259 * The new process might share some vmspace-related stuff 260 * with parent, depending on fork flags (CLONE_VM et.al). 261 * Force allocation of new base emuldata, and share the 262 * VM-related parts only if necessary. 263 */ 264 p->p_emuldata = NULL; 265 linux32_e_proc_init(p, parent, forkflags); 266 267 #ifdef LINUX32_NPTL 268 linux_nptl_proc_fork(p, parent, linux32_userret); 269 #endif 270 271 return; 272 } 273 274 #ifdef LINUX32_NPTL 275 void 276 linux32_userret(void) 277 { 278 struct lwp *l = curlwp; 279 struct proc *p = l->l_proc; 280 struct linux_emuldata *led = p->p_emuldata; 281 int error; 282 283 /* LINUX_CLONE_CHILD_SETTID: copy child's TID to child's memory */ 284 if (led->clone_flags & LINUX_CLONE_CHILD_SETTID) { 285 if ((error = copyout(&l->l_proc->p_pid, 286 led->child_tidptr, sizeof(l->l_proc->p_pid))) != 0) 287 printf("linux32_userret: LINUX_CLONE_CHILD_SETTID " 288 "failed (led->child_tidptr = %p, p->p_pid = %d)\n", 289 led->child_tidptr, p->p_pid); 290 } 291 292 /* LINUX_CLONE_SETTLS: allocate a new TLS */ 293 if (led->clone_flags & LINUX_CLONE_SETTLS) { 294 if (linux32_set_newtls(l, linux32_get_newtls(l)) != 0) 295 printf("linux32_userret: linux32_set_tls failed"); 296 } 297 298 return; 299 } 300 #endif /* LINUX32_NPTL */ 301