2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2004 Tim J. Robbins
5 * Copyright (c) 2002 Doug Rabson
6 * Copyright (c) 2000 Marcel Moolenaar
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer
14 * in this position and unchanged.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD$");
34 #include "opt_compat.h"
36 #include <sys/param.h>
37 #include <sys/systm.h>
38 #include <sys/imgact.h>
41 #include <sys/mutex.h>
43 #include <sys/ptrace.h>
44 #include <sys/racct.h>
45 #include <sys/sched.h>
46 #include <sys/syscallsubr.h>
49 #include <sys/unistd.h>
54 #include <vm/vm_map.h>
57 #include <machine/../linux32/linux.h>
58 #include <machine/../linux32/linux32_proto.h>
60 #include <machine/../linux/linux.h>
61 #include <machine/../linux/linux_proto.h>
63 #include <compat/linux/linux_emul.h>
64 #include <compat/linux/linux_futex.h>
65 #include <compat/linux/linux_misc.h>
66 #include <compat/linux/linux_util.h>
68 #ifdef LINUX_LEGACY_SYSCALLS
70 linux_fork(struct thread *td, struct linux_fork_args *args)
77 bzero(&fr, sizeof(fr));
78 fr.fr_flags = RFFDG | RFPROC | RFSTOPPED;
80 if ((error = fork1(td, &fr)) != 0)
83 td2 = FIRST_THREAD_IN_PROC(p2);
85 linux_proc_init(td, td2, 0);
87 td->td_retval[0] = p2->p_pid;
90 * Make this runnable after we are finished with it.
94 sched_add(td2, SRQ_BORING);
100 linux_vfork(struct thread *td, struct linux_vfork_args *args)
107 bzero(&fr, sizeof(fr));
108 fr.fr_flags = RFFDG | RFPROC | RFMEM | RFPPWAIT | RFSTOPPED;
110 if ((error = fork1(td, &fr)) != 0)
113 td2 = FIRST_THREAD_IN_PROC(p2);
115 linux_proc_init(td, td2, 0);
117 td->td_retval[0] = p2->p_pid;
120 * Make this runnable after we are finished with it.
124 sched_add(td2, SRQ_BORING);
131 linux_clone_proc(struct thread *td, struct linux_clone_args *args)
134 int error, ff = RFPROC | RFSTOPPED;
138 struct linux_emuldata *em;
140 exit_signal = args->flags & 0x000000ff;
141 if (LINUX_SIG_VALID(exit_signal)) {
142 exit_signal = linux_to_bsd_signal(exit_signal);
143 } else if (exit_signal != 0)
146 if (args->flags & LINUX_CLONE_VM)
148 if (args->flags & LINUX_CLONE_SIGHAND)
151 * XXX: In Linux, sharing of fs info (chroot/cwd/umask)
152 * and open files is independent. In FreeBSD, its in one
153 * structure but in reality it does not cause any problems
154 * because both of these flags are usually set together.
156 if (!(args->flags & (LINUX_CLONE_FILES | LINUX_CLONE_FS)))
159 if (args->flags & LINUX_CLONE_PARENT_SETTID)
160 if (args->parent_tidptr == NULL)
163 if (args->flags & LINUX_CLONE_VFORK)
166 bzero(&fr, sizeof(fr));
169 error = fork1(td, &fr);
173 td2 = FIRST_THREAD_IN_PROC(p2);
175 /* create the emuldata */
176 linux_proc_init(td, td2, args->flags);
179 KASSERT(em != NULL, ("clone_proc: emuldata not found.\n"));
181 if (args->flags & LINUX_CLONE_CHILD_SETTID)
182 em->child_set_tid = args->child_tidptr;
184 em->child_set_tid = NULL;
186 if (args->flags & LINUX_CLONE_CHILD_CLEARTID)
187 em->child_clear_tid = args->child_tidptr;
189 em->child_clear_tid = NULL;
191 if (args->flags & LINUX_CLONE_PARENT_SETTID) {
192 error = copyout(&p2->p_pid, args->parent_tidptr,
195 linux_msg(td, "copyout p_pid failed!");
199 p2->p_sigparent = exit_signal;
202 * In a case of stack = NULL, we are supposed to COW calling process
203 * stack. This is what normal fork() does, so we just keep tf_rsp arg
206 linux_set_upcall_kse(td2, PTROUT(args->stack));
208 if (args->flags & LINUX_CLONE_SETTLS)
209 linux_set_cloned_tls(td2, args->tls);
212 * If CLONE_PARENT is set, then the parent of the new process will be
213 * the same as that of the calling process.
215 if (args->flags & LINUX_CLONE_PARENT) {
216 sx_xlock(&proctree_lock);
218 proc_reparent(p2, td->td_proc->p_pptr, true);
220 sx_xunlock(&proctree_lock);
224 * Make this runnable after we are finished with it.
228 sched_add(td2, SRQ_BORING);
230 td->td_retval[0] = p2->p_pid;
236 linux_clone_thread(struct thread *td, struct linux_clone_args *args)
238 struct linux_emuldata *em;
239 struct thread *newtd;
243 LINUX_CTR4(clone_thread, "thread(%d) flags %x ptid %p ctid %p",
244 td->td_tid, (unsigned)args->flags,
245 args->parent_tidptr, args->child_tidptr);
247 if ((args->flags & LINUX_CLONE_PARENT) != 0)
249 if (args->flags & LINUX_CLONE_PARENT_SETTID)
250 if (args->parent_tidptr == NULL)
253 /* Threads should be created with own stack */
254 if (args->stack == NULL)
262 error = racct_add(p, RACCT_NTHR, 1);
269 /* Initialize our td */
270 error = kern_thr_alloc(p, 0, &newtd);
274 cpu_copy_thread(newtd, td);
276 bzero(&newtd->td_startzero,
277 __rangeof(struct thread, td_startzero, td_endzero));
278 bcopy(&td->td_startcopy, &newtd->td_startcopy,
279 __rangeof(struct thread, td_startcopy, td_endcopy));
282 thread_cow_get(newtd, td);
284 /* create the emuldata */
285 linux_proc_init(td, newtd, args->flags);
288 KASSERT(em != NULL, ("clone_thread: emuldata not found.\n"));
290 if (args->flags & LINUX_CLONE_SETTLS)
291 linux_set_cloned_tls(newtd, args->tls);
293 if (args->flags & LINUX_CLONE_CHILD_SETTID)
294 em->child_set_tid = args->child_tidptr;
296 em->child_set_tid = NULL;
298 if (args->flags & LINUX_CLONE_CHILD_CLEARTID)
299 em->child_clear_tid = args->child_tidptr;
301 em->child_clear_tid = NULL;
303 cpu_thread_clean(newtd);
305 linux_set_upcall_kse(newtd, PTROUT(args->stack));
308 p->p_flag |= P_HADTHREADS;
309 thread_link(newtd, p);
310 bcopy(p->p_comm, newtd->td_name, sizeof(newtd->td_name));
313 /* let the scheduler know about these things. */
314 sched_fork_thread(td, newtd);
317 newtd->td_flags |= TDF_ASTPENDING | TDF_NEEDSUSPCHK;
319 if (p->p_ptevents & PTRACE_LWP)
320 newtd->td_dbgflags |= TDB_BORN;
325 LINUX_CTR2(clone_thread, "thread(%d) successful clone to %d",
326 td->td_tid, newtd->td_tid);
328 if (args->flags & LINUX_CLONE_PARENT_SETTID) {
329 error = copyout(&newtd->td_tid, args->parent_tidptr,
330 sizeof(newtd->td_tid));
332 linux_msg(td, "clone_thread: copyout td_tid failed!");
336 * Make this runnable after we are finished with it.
339 TD_SET_CAN_RUN(newtd);
340 sched_add(newtd, SRQ_BORING);
342 td->td_retval[0] = newtd->td_tid;
350 racct_sub(p, RACCT_NTHR, 1);
358 linux_clone(struct thread *td, struct linux_clone_args *args)
361 if (args->flags & LINUX_CLONE_THREAD)
362 return (linux_clone_thread(td, args));
364 return (linux_clone_proc(td, args));
368 linux_exit(struct thread *td, struct linux_exit_args *args)
370 struct linux_emuldata *em;
373 KASSERT(em != NULL, ("exit: emuldata not found.\n"));
375 LINUX_CTR2(exit, "thread(%d) (%d)", em->em_tid, args->rval);
377 umtx_thread_exit(td);
379 linux_thread_detach(td);
382 * XXX. When the last two threads of a process
383 * exit via pthread_exit() try thr_exit() first.
386 exit1(td, args->rval, 0);
391 linux_set_tid_address(struct thread *td, struct linux_set_tid_address_args *args)
393 struct linux_emuldata *em;
396 KASSERT(em != NULL, ("set_tid_address: emuldata not found.\n"));
398 em->child_clear_tid = args->tidptr;
400 td->td_retval[0] = em->em_tid;
402 LINUX_CTR3(set_tid_address, "tidptr(%d) %p, returns %d",
403 em->em_tid, args->tidptr, td->td_retval[0]);
409 linux_thread_detach(struct thread *td)
411 struct linux_sys_futex_args cup;
412 struct linux_emuldata *em;
413 int *child_clear_tid;
417 KASSERT(em != NULL, ("thread_detach: emuldata not found.\n"));
419 LINUX_CTR1(thread_detach, "thread(%d)", em->em_tid);
421 release_futexes(td, em);
423 child_clear_tid = em->child_clear_tid;
425 if (child_clear_tid != NULL) {
426 LINUX_CTR2(thread_detach, "thread(%d) %p",
427 em->em_tid, child_clear_tid);
429 error = suword32(child_clear_tid, 0);
433 cup.uaddr = child_clear_tid;
434 cup.op = LINUX_FUTEX_WAKE;
435 cup.val = 1; /* wake one */
439 error = linux_sys_futex(td, &cup);
441 * this cannot happen at the moment and if this happens it
442 * probably means there is a user space bug
445 linux_msg(td, "futex stuff in thread_detach failed.");