1 /*- 2 * Copyright (c) 2004 Tim J. Robbins 3 * Copyright (c) 2002 Doug Rabson 4 * Copyright (c) 2000 Marcel Moolenaar 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer 12 * in this position and unchanged. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include "opt_compat.h" 33 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/imgact.h> 37 #include <sys/ktr.h> 38 #include <sys/lock.h> 39 #include <sys/mutex.h> 40 #include <sys/proc.h> 41 #include <sys/racct.h> 42 #include <sys/sched.h> 43 #include <sys/syscallsubr.h> 44 #include <sys/sx.h> 45 #include <sys/unistd.h> 46 #include <sys/wait.h> 47 48 #include <vm/vm.h> 49 #include <vm/pmap.h> 50 #include <vm/vm_map.h> 51 52 #ifdef COMPAT_LINUX32 53 #include <machine/../linux32/linux.h> 54 #include <machine/../linux32/linux32_proto.h> 55 #else 56 #include <machine/../linux/linux.h> 57 #include <machine/../linux/linux_proto.h> 58 #endif 59 #include <compat/linux/linux_signal.h> 60 #include <compat/linux/linux_emul.h> 61 #include <compat/linux/linux_misc.h> 62 #include <compat/linux/linux_util.h> 63 64 int 65 linux_fork(struct thread *td, struct linux_fork_args *args) 66 { 67 int error; 68 struct proc *p2; 69 struct thread *td2; 70 71 #ifdef DEBUG 72 if (ldebug(fork)) 73 printf(ARGS(fork, "")); 74 #endif 75 76 if ((error = fork1(td, RFFDG | RFPROC | RFSTOPPED, 0, &p2, NULL, 0)) 77 != 0) 78 return (error); 79 80 td2 = FIRST_THREAD_IN_PROC(p2); 81 82 linux_proc_init(td, td2, 0); 83 84 td->td_retval[0] = p2->p_pid; 85 86 /* 87 * Make this runnable after we are finished with it. 88 */ 89 thread_lock(td2); 90 TD_SET_CAN_RUN(td2); 91 sched_add(td2, SRQ_BORING); 92 thread_unlock(td2); 93 94 return (0); 95 } 96 97 int 98 linux_vfork(struct thread *td, struct linux_vfork_args *args) 99 { 100 int error; 101 struct proc *p2; 102 struct thread *td2; 103 104 #ifdef DEBUG 105 if (ldebug(vfork)) 106 printf(ARGS(vfork, "")); 107 #endif 108 109 /* Exclude RFPPWAIT */ 110 if ((error = fork1(td, RFFDG | RFPROC | RFMEM | RFSTOPPED, 0, &p2, 111 NULL, 0)) != 0) 112 return (error); 113 114 115 td2 = FIRST_THREAD_IN_PROC(p2); 116 117 linux_proc_init(td, td2, 0); 118 119 PROC_LOCK(p2); 120 p2->p_flag |= P_PPWAIT; 121 PROC_UNLOCK(p2); 122 123 td->td_retval[0] = p2->p_pid; 124 125 /* 126 * Make this runnable after we are finished with it. 127 */ 128 thread_lock(td2); 129 TD_SET_CAN_RUN(td2); 130 sched_add(td2, SRQ_BORING); 131 thread_unlock(td2); 132 133 /* wait for the children to exit, ie. emulate vfork */ 134 PROC_LOCK(p2); 135 while (p2->p_flag & P_PPWAIT) 136 cv_wait(&p2->p_pwait, &p2->p_mtx); 137 PROC_UNLOCK(p2); 138 139 return (0); 140 } 141 142 static int 143 linux_clone_proc(struct thread *td, struct linux_clone_args *args) 144 { 145 int error, ff = RFPROC | RFSTOPPED; 146 struct proc *p2; 147 struct thread *td2; 148 int exit_signal; 149 struct linux_emuldata *em; 150 151 #ifdef DEBUG 152 if (ldebug(clone)) { 153 printf(ARGS(clone, "flags %x, stack %p, parent tid: %p, " 154 "child tid: %p"), (unsigned)args->flags, 155 args->stack, args->parent_tidptr, args->child_tidptr); 156 } 157 #endif 158 159 exit_signal = args->flags & 0x000000ff; 160 if (LINUX_SIG_VALID(exit_signal)) { 161 if (exit_signal <= LINUX_SIGTBLSZ) 162 exit_signal = 163 linux_to_bsd_signal[_SIG_IDX(exit_signal)]; 164 } else if (exit_signal != 0) 165 return (EINVAL); 166 167 if (args->flags & LINUX_CLONE_VM) 168 ff |= RFMEM; 169 if (args->flags & LINUX_CLONE_SIGHAND) 170 ff |= RFSIGSHARE; 171 /* 172 * XXX: In Linux, sharing of fs info (chroot/cwd/umask) 173 * and open files is independant. In FreeBSD, its in one 174 * structure but in reality it does not cause any problems 175 * because both of these flags are usually set together. 176 */ 177 if (!(args->flags & (LINUX_CLONE_FILES | LINUX_CLONE_FS))) 178 ff |= RFFDG; 179 180 if (args->flags & LINUX_CLONE_PARENT_SETTID) 181 if (args->parent_tidptr == NULL) 182 return (EINVAL); 183 184 error = fork1(td, ff, 0, &p2, NULL, 0); 185 if (error) 186 return (error); 187 188 td2 = FIRST_THREAD_IN_PROC(p2); 189 190 /* create the emuldata */ 191 linux_proc_init(td, td2, args->flags); 192 193 em = em_find(td2); 194 KASSERT(em != NULL, ("clone_proc: emuldata not found.\n")); 195 196 if (args->flags & LINUX_CLONE_CHILD_SETTID) 197 em->child_set_tid = args->child_tidptr; 198 else 199 em->child_set_tid = NULL; 200 201 if (args->flags & LINUX_CLONE_CHILD_CLEARTID) 202 em->child_clear_tid = args->child_tidptr; 203 else 204 em->child_clear_tid = NULL; 205 206 if (args->flags & LINUX_CLONE_PARENT_SETTID) { 207 error = copyout(&p2->p_pid, args->parent_tidptr, 208 sizeof(p2->p_pid)); 209 if (error) 210 printf(LMSG("copyout failed!")); 211 } 212 213 PROC_LOCK(p2); 214 p2->p_sigparent = exit_signal; 215 PROC_UNLOCK(p2); 216 /* 217 * In a case of stack = NULL, we are supposed to COW calling process 218 * stack. This is what normal fork() does, so we just keep tf_rsp arg 219 * intact. 220 */ 221 linux_set_upcall_kse(td2, PTROUT(args->stack)); 222 223 if (args->flags & LINUX_CLONE_SETTLS) 224 linux_set_cloned_tls(td2, args->tls); 225 226 #ifdef DEBUG 227 if (ldebug(clone)) 228 printf(LMSG("clone: successful rfork to %d, " 229 "stack %p sig = %d"), (int)p2->p_pid, args->stack, 230 exit_signal); 231 #endif 232 233 if (args->flags & LINUX_CLONE_VFORK) { 234 PROC_LOCK(p2); 235 p2->p_flag |= P_PPWAIT; 236 PROC_UNLOCK(p2); 237 } 238 239 /* 240 * Make this runnable after we are finished with it. 241 */ 242 thread_lock(td2); 243 TD_SET_CAN_RUN(td2); 244 sched_add(td2, SRQ_BORING); 245 thread_unlock(td2); 246 247 td->td_retval[0] = p2->p_pid; 248 249 if (args->flags & LINUX_CLONE_VFORK) { 250 /* wait for the children to exit, ie. emulate vfork */ 251 PROC_LOCK(p2); 252 while (p2->p_flag & P_PPWAIT) 253 cv_wait(&p2->p_pwait, &p2->p_mtx); 254 PROC_UNLOCK(p2); 255 } 256 257 return (0); 258 } 259 260 static int 261 linux_clone_thread(struct thread *td, struct linux_clone_args *args) 262 { 263 struct linux_emuldata *em; 264 struct thread *newtd; 265 struct proc *p; 266 int error; 267 268 #ifdef DEBUG 269 if (ldebug(clone)) { 270 printf(ARGS(clone, "thread: flags %x, stack %p, parent tid: %p, " 271 "child tid: %p"), (unsigned)args->flags, 272 args->stack, args->parent_tidptr, args->child_tidptr); 273 } 274 #endif 275 276 LINUX_CTR4(clone, "thread(%d) flags %x ptid %p ctid %p", 277 td->td_tid, (unsigned)args->flags, 278 args->parent_tidptr, args->child_tidptr); 279 280 if (args->flags & LINUX_CLONE_PARENT_SETTID) 281 if (args->parent_tidptr == NULL) 282 return (EINVAL); 283 284 /* Threads should be created with own stack */ 285 if (args->stack == NULL) 286 return (EINVAL); 287 288 p = td->td_proc; 289 290 /* Initialize our td */ 291 error = kern_thr_alloc(p, 0, &newtd); 292 if (error) 293 return (error); 294 295 cpu_set_upcall(newtd, td); 296 297 bzero(&newtd->td_startzero, 298 __rangeof(struct thread, td_startzero, td_endzero)); 299 bcopy(&td->td_startcopy, &newtd->td_startcopy, 300 __rangeof(struct thread, td_startcopy, td_endcopy)); 301 302 newtd->td_proc = p; 303 newtd->td_ucred = crhold(td->td_ucred); 304 305 /* create the emuldata */ 306 linux_proc_init(td, newtd, args->flags); 307 308 em = em_find(newtd); 309 KASSERT(em != NULL, ("clone_thread: emuldata not found.\n")); 310 311 if (args->flags & LINUX_CLONE_SETTLS) 312 linux_set_cloned_tls(newtd, args->tls); 313 314 if (args->flags & LINUX_CLONE_CHILD_SETTID) 315 em->child_set_tid = args->child_tidptr; 316 else 317 em->child_set_tid = NULL; 318 319 if (args->flags & LINUX_CLONE_CHILD_CLEARTID) 320 em->child_clear_tid = args->child_tidptr; 321 else 322 em->child_clear_tid = NULL; 323 324 cpu_thread_clean(newtd); 325 326 linux_set_upcall_kse(newtd, PTROUT(args->stack)); 327 328 PROC_LOCK(p); 329 p->p_flag |= P_HADTHREADS; 330 newtd->td_sigmask = td->td_sigmask; 331 bcopy(p->p_comm, newtd->td_name, sizeof(newtd->td_name)); 332 333 if (args->flags & LINUX_CLONE_PARENT) 334 thread_link(newtd, p->p_pptr); 335 else 336 thread_link(newtd, p); 337 338 thread_lock(td); 339 /* let the scheduler know about these things. */ 340 sched_fork_thread(td, newtd); 341 thread_unlock(td); 342 if (P_SHOULDSTOP(p)) 343 newtd->td_flags |= TDF_ASTPENDING | TDF_NEEDSUSPCHK; 344 PROC_UNLOCK(p); 345 346 tidhash_add(newtd); 347 348 #ifdef DEBUG 349 if (ldebug(clone)) 350 printf(ARGS(clone, "successful clone to %d, stack %p"), 351 (int)newtd->td_tid, args->stack); 352 #endif 353 354 LINUX_CTR2(clone, "thread(%d) successful clone to %d", 355 td->td_tid, newtd->td_tid); 356 357 if (args->flags & LINUX_CLONE_PARENT_SETTID) { 358 error = copyout(&newtd->td_tid, args->parent_tidptr, 359 sizeof(newtd->td_tid)); 360 if (error) 361 printf(LMSG("clone_thread: copyout failed!")); 362 } 363 364 /* 365 * Make this runnable after we are finished with it. 366 */ 367 thread_lock(newtd); 368 TD_SET_CAN_RUN(newtd); 369 sched_add(newtd, SRQ_BORING); 370 thread_unlock(newtd); 371 372 td->td_retval[0] = newtd->td_tid; 373 374 return (0); 375 } 376 377 int 378 linux_clone(struct thread *td, struct linux_clone_args *args) 379 { 380 381 if (args->flags & LINUX_CLONE_THREAD) 382 return (linux_clone_thread(td, args)); 383 else 384 return (linux_clone_proc(td, args)); 385 } 386 387 int 388 linux_exit(struct thread *td, struct linux_exit_args *args) 389 { 390 struct linux_emuldata *em; 391 392 em = em_find(td); 393 KASSERT(em != NULL, ("exit: emuldata not found.\n")); 394 395 LINUX_CTR2(exit, "thread(%d) (%d)", em->em_tid, args->rval); 396 397 linux_thread_detach(td); 398 399 /* 400 * XXX. When the last two threads of a process 401 * exit via pthread_exit() try thr_exit() first. 402 */ 403 kern_thr_exit(td); 404 exit1(td, W_EXITCODE(args->rval, 0)); 405 /* NOTREACHED */ 406 } 407