7f2d13d607
Mainly focus on files that use BSD 2-Clause license, however the tool I was using misidentified many licenses so this was mostly a manual - error prone - task. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts.
488 lines
11 KiB
C
488 lines
11 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2004 Tim J. Robbins
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* Copyright (c) 2002 Doug Rabson
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* Copyright (c) 2000 Marcel Moolenaar
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer
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* in this position and unchanged.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_compat.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/imgact.h>
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#include <sys/ktr.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/proc.h>
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#include <sys/racct.h>
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#include <sys/sched.h>
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#include <sys/syscallsubr.h>
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#include <sys/sx.h>
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#include <sys/umtx.h>
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#include <sys/unistd.h>
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#include <sys/wait.h>
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#include <vm/vm.h>
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#include <vm/pmap.h>
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#include <vm/vm_map.h>
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#ifdef COMPAT_LINUX32
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#include <machine/../linux32/linux.h>
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#include <machine/../linux32/linux32_proto.h>
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#else
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#include <machine/../linux/linux.h>
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#include <machine/../linux/linux_proto.h>
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#endif
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#include <compat/linux/linux_emul.h>
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#include <compat/linux/linux_futex.h>
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#include <compat/linux/linux_misc.h>
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#include <compat/linux/linux_util.h>
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int
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linux_fork(struct thread *td, struct linux_fork_args *args)
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{
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struct fork_req fr;
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int error;
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struct proc *p2;
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struct thread *td2;
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#ifdef DEBUG
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if (ldebug(fork))
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printf(ARGS(fork, ""));
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#endif
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bzero(&fr, sizeof(fr));
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fr.fr_flags = RFFDG | RFPROC | RFSTOPPED;
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fr.fr_procp = &p2;
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if ((error = fork1(td, &fr)) != 0)
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return (error);
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td2 = FIRST_THREAD_IN_PROC(p2);
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linux_proc_init(td, td2, 0);
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td->td_retval[0] = p2->p_pid;
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/*
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* Make this runnable after we are finished with it.
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*/
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thread_lock(td2);
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TD_SET_CAN_RUN(td2);
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sched_add(td2, SRQ_BORING);
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thread_unlock(td2);
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return (0);
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}
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int
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linux_vfork(struct thread *td, struct linux_vfork_args *args)
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{
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struct fork_req fr;
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int error;
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struct proc *p2;
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struct thread *td2;
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#ifdef DEBUG
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if (ldebug(vfork))
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printf(ARGS(vfork, ""));
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#endif
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bzero(&fr, sizeof(fr));
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fr.fr_flags = RFFDG | RFPROC | RFMEM | RFPPWAIT | RFSTOPPED;
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fr.fr_procp = &p2;
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if ((error = fork1(td, &fr)) != 0)
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return (error);
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td2 = FIRST_THREAD_IN_PROC(p2);
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linux_proc_init(td, td2, 0);
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td->td_retval[0] = p2->p_pid;
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/*
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* Make this runnable after we are finished with it.
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*/
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thread_lock(td2);
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TD_SET_CAN_RUN(td2);
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sched_add(td2, SRQ_BORING);
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thread_unlock(td2);
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return (0);
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}
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static int
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linux_clone_proc(struct thread *td, struct linux_clone_args *args)
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{
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struct fork_req fr;
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int error, ff = RFPROC | RFSTOPPED;
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struct proc *p2;
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struct thread *td2;
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int exit_signal;
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struct linux_emuldata *em;
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#ifdef DEBUG
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if (ldebug(clone)) {
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printf(ARGS(clone, "flags %x, stack %p, parent tid: %p, "
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"child tid: %p"), (unsigned)args->flags,
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args->stack, args->parent_tidptr, args->child_tidptr);
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}
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#endif
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exit_signal = args->flags & 0x000000ff;
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if (LINUX_SIG_VALID(exit_signal)) {
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exit_signal = linux_to_bsd_signal(exit_signal);
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} else if (exit_signal != 0)
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return (EINVAL);
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if (args->flags & LINUX_CLONE_VM)
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ff |= RFMEM;
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if (args->flags & LINUX_CLONE_SIGHAND)
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ff |= RFSIGSHARE;
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/*
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* XXX: In Linux, sharing of fs info (chroot/cwd/umask)
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* and open files is independent. In FreeBSD, its in one
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* structure but in reality it does not cause any problems
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* because both of these flags are usually set together.
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*/
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if (!(args->flags & (LINUX_CLONE_FILES | LINUX_CLONE_FS)))
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ff |= RFFDG;
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if (args->flags & LINUX_CLONE_PARENT_SETTID)
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if (args->parent_tidptr == NULL)
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return (EINVAL);
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if (args->flags & LINUX_CLONE_VFORK)
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ff |= RFPPWAIT;
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bzero(&fr, sizeof(fr));
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fr.fr_flags = ff;
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fr.fr_procp = &p2;
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error = fork1(td, &fr);
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if (error)
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return (error);
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td2 = FIRST_THREAD_IN_PROC(p2);
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/* create the emuldata */
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linux_proc_init(td, td2, args->flags);
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em = em_find(td2);
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KASSERT(em != NULL, ("clone_proc: emuldata not found.\n"));
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if (args->flags & LINUX_CLONE_CHILD_SETTID)
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em->child_set_tid = args->child_tidptr;
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else
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em->child_set_tid = NULL;
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if (args->flags & LINUX_CLONE_CHILD_CLEARTID)
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em->child_clear_tid = args->child_tidptr;
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else
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em->child_clear_tid = NULL;
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if (args->flags & LINUX_CLONE_PARENT_SETTID) {
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error = copyout(&p2->p_pid, args->parent_tidptr,
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sizeof(p2->p_pid));
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if (error)
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printf(LMSG("copyout failed!"));
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}
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PROC_LOCK(p2);
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p2->p_sigparent = exit_signal;
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PROC_UNLOCK(p2);
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/*
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* In a case of stack = NULL, we are supposed to COW calling process
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* stack. This is what normal fork() does, so we just keep tf_rsp arg
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* intact.
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*/
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linux_set_upcall_kse(td2, PTROUT(args->stack));
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if (args->flags & LINUX_CLONE_SETTLS)
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linux_set_cloned_tls(td2, args->tls);
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/*
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* If CLONE_PARENT is set, then the parent of the new process will be
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* the same as that of the calling process.
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*/
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if (args->flags & LINUX_CLONE_PARENT) {
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sx_xlock(&proctree_lock);
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PROC_LOCK(p2);
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proc_reparent(p2, td->td_proc->p_pptr);
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PROC_UNLOCK(p2);
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sx_xunlock(&proctree_lock);
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}
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#ifdef DEBUG
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if (ldebug(clone))
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printf(LMSG("clone: successful rfork to %d, "
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"stack %p sig = %d"), (int)p2->p_pid, args->stack,
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exit_signal);
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#endif
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/*
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* Make this runnable after we are finished with it.
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*/
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thread_lock(td2);
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TD_SET_CAN_RUN(td2);
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sched_add(td2, SRQ_BORING);
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thread_unlock(td2);
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td->td_retval[0] = p2->p_pid;
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return (0);
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}
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static int
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linux_clone_thread(struct thread *td, struct linux_clone_args *args)
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{
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struct linux_emuldata *em;
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struct thread *newtd;
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struct proc *p;
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int error;
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#ifdef DEBUG
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if (ldebug(clone)) {
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printf(ARGS(clone, "thread: flags %x, stack %p, parent tid: %p, "
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"child tid: %p"), (unsigned)args->flags,
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args->stack, args->parent_tidptr, args->child_tidptr);
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}
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#endif
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LINUX_CTR4(clone_thread, "thread(%d) flags %x ptid %p ctid %p",
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td->td_tid, (unsigned)args->flags,
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args->parent_tidptr, args->child_tidptr);
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if (args->flags & LINUX_CLONE_PARENT_SETTID)
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if (args->parent_tidptr == NULL)
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return (EINVAL);
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/* Threads should be created with own stack */
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if (args->stack == NULL)
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return (EINVAL);
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p = td->td_proc;
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#ifdef RACCT
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if (racct_enable) {
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PROC_LOCK(p);
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error = racct_add(p, RACCT_NTHR, 1);
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PROC_UNLOCK(p);
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if (error != 0)
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return (EPROCLIM);
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}
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#endif
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/* Initialize our td */
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error = kern_thr_alloc(p, 0, &newtd);
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if (error)
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goto fail;
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cpu_copy_thread(newtd, td);
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bzero(&newtd->td_startzero,
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__rangeof(struct thread, td_startzero, td_endzero));
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bcopy(&td->td_startcopy, &newtd->td_startcopy,
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__rangeof(struct thread, td_startcopy, td_endcopy));
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newtd->td_proc = p;
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thread_cow_get(newtd, td);
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/* create the emuldata */
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linux_proc_init(td, newtd, args->flags);
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em = em_find(newtd);
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KASSERT(em != NULL, ("clone_thread: emuldata not found.\n"));
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if (args->flags & LINUX_CLONE_SETTLS)
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linux_set_cloned_tls(newtd, args->tls);
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if (args->flags & LINUX_CLONE_CHILD_SETTID)
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em->child_set_tid = args->child_tidptr;
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else
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em->child_set_tid = NULL;
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if (args->flags & LINUX_CLONE_CHILD_CLEARTID)
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em->child_clear_tid = args->child_tidptr;
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else
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em->child_clear_tid = NULL;
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cpu_thread_clean(newtd);
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linux_set_upcall_kse(newtd, PTROUT(args->stack));
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PROC_LOCK(p);
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p->p_flag |= P_HADTHREADS;
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bcopy(p->p_comm, newtd->td_name, sizeof(newtd->td_name));
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if (args->flags & LINUX_CLONE_PARENT)
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thread_link(newtd, p->p_pptr);
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else
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thread_link(newtd, p);
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thread_lock(td);
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/* let the scheduler know about these things. */
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sched_fork_thread(td, newtd);
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thread_unlock(td);
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if (P_SHOULDSTOP(p))
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newtd->td_flags |= TDF_ASTPENDING | TDF_NEEDSUSPCHK;
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PROC_UNLOCK(p);
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tidhash_add(newtd);
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#ifdef DEBUG
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if (ldebug(clone))
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printf(ARGS(clone, "successful clone to %d, stack %p"),
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(int)newtd->td_tid, args->stack);
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#endif
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LINUX_CTR2(clone_thread, "thread(%d) successful clone to %d",
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td->td_tid, newtd->td_tid);
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if (args->flags & LINUX_CLONE_PARENT_SETTID) {
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error = copyout(&newtd->td_tid, args->parent_tidptr,
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sizeof(newtd->td_tid));
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if (error)
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printf(LMSG("clone_thread: copyout failed!"));
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}
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/*
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* Make this runnable after we are finished with it.
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*/
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thread_lock(newtd);
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TD_SET_CAN_RUN(newtd);
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sched_add(newtd, SRQ_BORING);
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thread_unlock(newtd);
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td->td_retval[0] = newtd->td_tid;
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return (0);
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fail:
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#ifdef RACCT
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if (racct_enable) {
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PROC_LOCK(p);
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racct_sub(p, RACCT_NTHR, 1);
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PROC_UNLOCK(p);
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}
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#endif
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return (error);
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}
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int
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linux_clone(struct thread *td, struct linux_clone_args *args)
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{
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if (args->flags & LINUX_CLONE_THREAD)
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return (linux_clone_thread(td, args));
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else
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return (linux_clone_proc(td, args));
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}
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int
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linux_exit(struct thread *td, struct linux_exit_args *args)
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{
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struct linux_emuldata *em;
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em = em_find(td);
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KASSERT(em != NULL, ("exit: emuldata not found.\n"));
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LINUX_CTR2(exit, "thread(%d) (%d)", em->em_tid, args->rval);
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umtx_thread_exit(td);
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linux_thread_detach(td);
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/*
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* XXX. When the last two threads of a process
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* exit via pthread_exit() try thr_exit() first.
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*/
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kern_thr_exit(td);
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exit1(td, args->rval, 0);
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/* NOTREACHED */
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}
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int
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linux_set_tid_address(struct thread *td, struct linux_set_tid_address_args *args)
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{
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struct linux_emuldata *em;
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em = em_find(td);
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KASSERT(em != NULL, ("set_tid_address: emuldata not found.\n"));
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em->child_clear_tid = args->tidptr;
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td->td_retval[0] = em->em_tid;
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LINUX_CTR3(set_tid_address, "tidptr(%d) %p, returns %d",
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em->em_tid, args->tidptr, td->td_retval[0]);
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return (0);
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}
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void
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linux_thread_detach(struct thread *td)
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{
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struct linux_sys_futex_args cup;
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struct linux_emuldata *em;
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int *child_clear_tid;
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int error;
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em = em_find(td);
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KASSERT(em != NULL, ("thread_detach: emuldata not found.\n"));
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LINUX_CTR1(thread_detach, "thread(%d)", em->em_tid);
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release_futexes(td, em);
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child_clear_tid = em->child_clear_tid;
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if (child_clear_tid != NULL) {
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LINUX_CTR2(thread_detach, "thread(%d) %p",
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em->em_tid, child_clear_tid);
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error = suword32(child_clear_tid, 0);
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if (error != 0)
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return;
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cup.uaddr = child_clear_tid;
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cup.op = LINUX_FUTEX_WAKE;
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cup.val = 1; /* wake one */
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cup.timeout = NULL;
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cup.uaddr2 = NULL;
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cup.val3 = 0;
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error = linux_sys_futex(td, &cup);
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/*
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* this cannot happen at the moment and if this happens it
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* probably means there is a user space bug
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*/
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if (error != 0)
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linux_msg(td, "futex stuff in thread_detach failed.");
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}
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}
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