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);
101 linux_vfork(struct thread *td, struct linux_vfork_args *args)
108 bzero(&fr, sizeof(fr));
109 fr.fr_flags = RFFDG | RFPROC | RFMEM | RFPPWAIT | RFSTOPPED;
111 if ((error = fork1(td, &fr)) != 0)
114 td2 = FIRST_THREAD_IN_PROC(p2);
116 linux_proc_init(td, td2, 0);
118 td->td_retval[0] = p2->p_pid;
121 * Make this runnable after we are finished with it.
125 sched_add(td2, SRQ_BORING);
133 linux_clone_proc(struct thread *td, struct linux_clone_args *args)
136 int error, ff = RFPROC | RFSTOPPED;
140 struct linux_emuldata *em;
142 exit_signal = args->flags & 0x000000ff;
143 if (LINUX_SIG_VALID(exit_signal)) {
144 exit_signal = linux_to_bsd_signal(exit_signal);
145 } else if (exit_signal != 0)
148 if (args->flags & LINUX_CLONE_VM)
150 if (args->flags & LINUX_CLONE_SIGHAND)
153 * XXX: In Linux, sharing of fs info (chroot/cwd/umask)
154 * and open files is independent. In FreeBSD, its in one
155 * structure but in reality it does not cause any problems
156 * because both of these flags are usually set together.
158 if (!(args->flags & (LINUX_CLONE_FILES | LINUX_CLONE_FS)))
161 if (args->flags & LINUX_CLONE_PARENT_SETTID)
162 if (args->parent_tidptr == NULL)
165 if (args->flags & LINUX_CLONE_VFORK)
168 bzero(&fr, sizeof(fr));
171 error = fork1(td, &fr);
175 td2 = FIRST_THREAD_IN_PROC(p2);
177 /* create the emuldata */
178 linux_proc_init(td, td2, args->flags);
181 KASSERT(em != NULL, ("clone_proc: emuldata not found.\n"));
183 if (args->flags & LINUX_CLONE_CHILD_SETTID)
184 em->child_set_tid = args->child_tidptr;
186 em->child_set_tid = NULL;
188 if (args->flags & LINUX_CLONE_CHILD_CLEARTID)
189 em->child_clear_tid = args->child_tidptr;
191 em->child_clear_tid = NULL;
193 if (args->flags & LINUX_CLONE_PARENT_SETTID) {
194 error = copyout(&p2->p_pid, args->parent_tidptr,
197 linux_msg(td, "copyout p_pid failed!");
201 p2->p_sigparent = exit_signal;
204 * In a case of stack = NULL, we are supposed to COW calling process
205 * stack. This is what normal fork() does, so we just keep tf_rsp arg
208 linux_set_upcall_kse(td2, PTROUT(args->stack));
210 if (args->flags & LINUX_CLONE_SETTLS)
211 linux_set_cloned_tls(td2, args->tls);
214 * If CLONE_PARENT is set, then the parent of the new process will be
215 * the same as that of the calling process.
217 if (args->flags & LINUX_CLONE_PARENT) {
218 sx_xlock(&proctree_lock);
220 proc_reparent(p2, td->td_proc->p_pptr, true);
222 sx_xunlock(&proctree_lock);
226 * Make this runnable after we are finished with it.
230 sched_add(td2, SRQ_BORING);
233 td->td_retval[0] = p2->p_pid;
239 linux_clone_thread(struct thread *td, struct linux_clone_args *args)
241 struct linux_emuldata *em;
242 struct thread *newtd;
246 LINUX_CTR4(clone_thread, "thread(%d) flags %x ptid %p ctid %p",
247 td->td_tid, (unsigned)args->flags,
248 args->parent_tidptr, args->child_tidptr);
250 if (args->flags & LINUX_CLONE_PARENT_SETTID)
251 if (args->parent_tidptr == NULL)
254 /* Threads should be created with own stack */
255 if (args->stack == NULL)
263 error = racct_add(p, RACCT_NTHR, 1);
270 /* Initialize our td */
271 error = kern_thr_alloc(p, 0, &newtd);
275 cpu_copy_thread(newtd, td);
277 bzero(&newtd->td_startzero,
278 __rangeof(struct thread, td_startzero, td_endzero));
279 bcopy(&td->td_startcopy, &newtd->td_startcopy,
280 __rangeof(struct thread, td_startcopy, td_endcopy));
283 thread_cow_get(newtd, td);
285 /* create the emuldata */
286 linux_proc_init(td, newtd, args->flags);
289 KASSERT(em != NULL, ("clone_thread: emuldata not found.\n"));
291 if (args->flags & LINUX_CLONE_SETTLS)
292 linux_set_cloned_tls(newtd, args->tls);
294 if (args->flags & LINUX_CLONE_CHILD_SETTID)
295 em->child_set_tid = args->child_tidptr;
297 em->child_set_tid = NULL;
299 if (args->flags & LINUX_CLONE_CHILD_CLEARTID)
300 em->child_clear_tid = args->child_tidptr;
302 em->child_clear_tid = NULL;
304 cpu_thread_clean(newtd);
306 linux_set_upcall_kse(newtd, PTROUT(args->stack));
309 p->p_flag |= P_HADTHREADS;
310 bcopy(p->p_comm, newtd->td_name, sizeof(newtd->td_name));
312 if (args->flags & LINUX_CLONE_PARENT)
313 thread_link(newtd, p->p_pptr);
315 thread_link(newtd, p);
318 /* let the scheduler know about these things. */
319 sched_fork_thread(td, newtd);
322 newtd->td_flags |= TDF_ASTPENDING | TDF_NEEDSUSPCHK;
324 if (p->p_ptevents & PTRACE_LWP)
325 newtd->td_dbgflags |= TDB_BORN;
330 LINUX_CTR2(clone_thread, "thread(%d) successful clone to %d",
331 td->td_tid, newtd->td_tid);
333 if (args->flags & LINUX_CLONE_PARENT_SETTID) {
334 error = copyout(&newtd->td_tid, args->parent_tidptr,
335 sizeof(newtd->td_tid));
337 linux_msg(td, "clone_thread: copyout td_tid failed!");
341 * Make this runnable after we are finished with it.
344 TD_SET_CAN_RUN(newtd);
345 sched_add(newtd, SRQ_BORING);
346 thread_unlock(newtd);
348 td->td_retval[0] = newtd->td_tid;
356 racct_sub(p, RACCT_NTHR, 1);
364 linux_clone(struct thread *td, struct linux_clone_args *args)
367 if (args->flags & LINUX_CLONE_THREAD)
368 return (linux_clone_thread(td, args));
370 return (linux_clone_proc(td, args));
374 linux_exit(struct thread *td, struct linux_exit_args *args)
376 struct linux_emuldata *em;
379 KASSERT(em != NULL, ("exit: emuldata not found.\n"));
381 LINUX_CTR2(exit, "thread(%d) (%d)", em->em_tid, args->rval);
383 umtx_thread_exit(td);
385 linux_thread_detach(td);
388 * XXX. When the last two threads of a process
389 * exit via pthread_exit() try thr_exit() first.
392 exit1(td, args->rval, 0);
397 linux_set_tid_address(struct thread *td, struct linux_set_tid_address_args *args)
399 struct linux_emuldata *em;
402 KASSERT(em != NULL, ("set_tid_address: emuldata not found.\n"));
404 em->child_clear_tid = args->tidptr;
406 td->td_retval[0] = em->em_tid;
408 LINUX_CTR3(set_tid_address, "tidptr(%d) %p, returns %d",
409 em->em_tid, args->tidptr, td->td_retval[0]);
415 linux_thread_detach(struct thread *td)
417 struct linux_sys_futex_args cup;
418 struct linux_emuldata *em;
419 int *child_clear_tid;
423 KASSERT(em != NULL, ("thread_detach: emuldata not found.\n"));
425 LINUX_CTR1(thread_detach, "thread(%d)", em->em_tid);
427 release_futexes(td, em);
429 child_clear_tid = em->child_clear_tid;
431 if (child_clear_tid != NULL) {
433 LINUX_CTR2(thread_detach, "thread(%d) %p",
434 em->em_tid, child_clear_tid);
436 error = suword32(child_clear_tid, 0);
440 cup.uaddr = child_clear_tid;
441 cup.op = LINUX_FUTEX_WAKE;
442 cup.val = 1; /* wake one */
446 error = linux_sys_futex(td, &cup);
448 * this cannot happen at the moment and if this happens it
449 * probably means there is a user space bug
452 linux_msg(td, "futex stuff in thread_detach failed.");