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54366c0bd7
option, unbreak the lock tracing release semantic by embedding calls to LOCKSTAT_PROFILE_RELEASE_LOCK() direclty in the inlined version of the releasing functions for mutex, rwlock and sxlock. Failing to do so skips the lockstat_probe_func invokation for unlocking. - As part of the LOCKSTAT support is inlined in mutex operation, for kernel compiled without lock debugging options, potentially every consumer must be compiled including opt_kdtrace.h. Fix this by moving KDTRACE_HOOKS into opt_global.h and remove the dependency by opt_kdtrace.h for all files, as now only KDTRACE_FRAMES is linked there and it is only used as a compile-time stub [0]. [0] immediately shows some new bug as DTRACE-derived support for debug in sfxge is broken and it was never really tested. As it was not including correctly opt_kdtrace.h before it was never enabled so it was kept broken for a while. Fix this by using a protection stub, leaving sfxge driver authors the responsibility for fixing it appropriately [1]. Sponsored by: EMC / Isilon storage division Discussed with: rstone [0] Reported by: rstone [1] Discussed with: philip
300 lines
7.7 KiB
C
300 lines
7.7 KiB
C
/*-
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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/lock.h>
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#include <sys/mutex.h>
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#include <sys/proc.h>
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#include <sys/sched.h>
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#include <sys/sdt.h>
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#include <sys/sx.h>
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#include <sys/unistd.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_dtrace.h>
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#include <compat/linux/linux_signal.h>
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#include <compat/linux/linux_emul.h>
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#include <compat/linux/linux_misc.h>
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/* DTrace init */
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LIN_SDT_PROVIDER_DECLARE(LINUX_DTRACE);
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/* Linuxulator-global DTrace probes */
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LIN_SDT_PROBE_DECLARE(locks, emul_lock, locked);
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LIN_SDT_PROBE_DECLARE(locks, emul_lock, unlock);
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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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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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if ((error = fork1(td, RFFDG | RFPROC | RFSTOPPED, 0, &p2, NULL, 0))
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!= 0)
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return (error);
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td->td_retval[0] = p2->p_pid;
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td->td_retval[1] = 0;
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error = linux_proc_init(td, td->td_retval[0], 0);
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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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/*
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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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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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/* Exclude RFPPWAIT */
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if ((error = fork1(td, RFFDG | RFPROC | RFMEM | RFSTOPPED, 0, &p2,
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NULL, 0)) != 0)
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return (error);
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td->td_retval[0] = p2->p_pid;
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error = linux_proc_init(td, td->td_retval[0], 0);
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if (error)
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return (error);
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PROC_LOCK(p2);
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p2->p_flag |= P_PPWAIT;
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PROC_UNLOCK(p2);
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td2 = FIRST_THREAD_IN_PROC(p2);
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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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/* wait for the children to exit, ie. emulate vfork */
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PROC_LOCK(p2);
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while (p2->p_flag & P_PPWAIT)
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cv_wait(&p2->p_pwait, &p2->p_mtx);
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PROC_UNLOCK(p2);
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return (0);
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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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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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if (exit_signal <= LINUX_SIGTBLSZ)
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exit_signal =
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linux_to_bsd_signal[_SIG_IDX(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 independant. 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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/*
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* Attempt to detect when linux_clone(2) is used for creating
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* kernel threads. Unfortunately despite the existence of the
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* CLONE_THREAD flag, version of linuxthreads package used in
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* most popular distros as of beginning of 2005 doesn't make
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* any use of it. Therefore, this detection relies on
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* empirical observation that linuxthreads sets certain
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* combination of flags, so that we can make more or less
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* precise detection and notify the FreeBSD kernel that several
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* processes are in fact part of the same threading group, so
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* that special treatment is necessary for signal delivery
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* between those processes and fd locking.
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*/
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if ((args->flags & 0xffffff00) == LINUX_THREADING_FLAGS)
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ff |= RFTHREAD;
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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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error = fork1(td, ff, 0, &p2, NULL, 0);
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if (error)
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return (error);
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if (args->flags & (LINUX_CLONE_PARENT | LINUX_CLONE_THREAD)) {
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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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/* create the emuldata */
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error = linux_proc_init(td, p2->p_pid, args->flags);
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/* reference it - no need to check this */
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em = em_find(p2, EMUL_DOLOCK);
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KASSERT(em != NULL, ("clone: emuldata not found."));
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/* and adjust it */
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if (args->flags & LINUX_CLONE_THREAD) {
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#ifdef notyet
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PROC_LOCK(p2);
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p2->p_pgrp = td->td_proc->p_pgrp;
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PROC_UNLOCK(p2);
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#endif
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exit_signal = 0;
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}
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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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EMUL_UNLOCK(&emul_lock);
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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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td2 = FIRST_THREAD_IN_PROC(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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if (args->stack)
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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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#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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if (args->flags & LINUX_CLONE_VFORK) {
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PROC_LOCK(p2);
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p2->p_flag |= P_PPWAIT;
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PROC_UNLOCK(p2);
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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(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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td->td_retval[1] = 0;
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if (args->flags & LINUX_CLONE_VFORK) {
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/* wait for the children to exit, ie. emulate vfork */
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PROC_LOCK(p2);
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while (p2->p_flag & P_PPWAIT)
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cv_wait(&p2->p_pwait, &p2->p_mtx);
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PROC_UNLOCK(p2);
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}
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return (0);
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}
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