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📄 Make.tags.inc(2.13 KB)
📄 Makefile(302 B)
📄 bus_if.m(26.31 KB)
📄 capabilities.conf(13.67 KB)
📄 clock_if.m(1.7 KB)
📄 cpufreq_if.m(2.27 KB)
📄 device_if.m(10.41 KB)
📄 firmw.S(2.15 KB)
📄 genassym.sh(1.11 KB)
📄 genoffset.c(1.68 KB)
📄 genoffset.sh(3.58 KB)
📄 imgact_aout.c(9.45 KB)
📄 imgact_binmisc.c(18.64 KB)
📄 imgact_elf.c(76.32 KB)
📄 imgact_elf32.c(1.47 KB)
📄 imgact_elf64.c(1.47 KB)
📄 imgact_shell.c(8.41 KB)
📄 init_main.c(24.31 KB)
📄 init_sysent.c(95.3 KB)
📄 kern_acct.c(19.03 KB)
📄 kern_alq.c(24.97 KB)
📄 kern_clock.c(21.12 KB)
📄 kern_clocksource.c(23.34 KB)
📄 kern_condvar.c(11.28 KB)
📄 kern_conf.c(36.14 KB)
📄 kern_cons.c(15.75 KB)
📄 kern_context.c(3.59 KB)
📄 kern_cpu.c(30.77 KB)
📄 kern_cpuset.c(59.78 KB)
📄 kern_ctf.c(8.73 KB)
📄 kern_descrip.c(112.87 KB)
📄 kern_dtrace.c(2.94 KB)
📄 kern_dump.c(8.51 KB)
📄 kern_environment.c(22.75 KB)
📄 kern_et.c(7.1 KB)
📄 kern_event.c(62.49 KB)
📄 kern_exec.c(46.67 KB)
📄 kern_exit.c(34.61 KB)
📄 kern_fail.c(29.32 KB)
📄 kern_ffclock.c(12.66 KB)
📄 kern_fork.c(28.29 KB)
📄 kern_hhook.c(13.58 KB)
📄 kern_idle.c(2.74 KB)
📄 kern_intr.c(40.44 KB)
📄 kern_jail.c(112.67 KB)
📄 kern_kcov.c(15.32 KB)
📄 kern_khelp.c(9.45 KB)
📄 kern_kthread.c(11.8 KB)
📄 kern_ktr.c(11.93 KB)
📄 kern_ktrace.c(31.41 KB)
📄 kern_linker.c(54.3 KB)
📄 kern_lock.c(46.99 KB)
📄 kern_lockf.c(64.46 KB)
📄 kern_lockstat.c(3.8 KB)
📄 kern_loginclass.c(6.69 KB)
📄 kern_malloc.c(37.09 KB)
📄 kern_mbuf.c(43.16 KB)
📄 kern_mib.c(24.26 KB)
📄 kern_module.c(11.05 KB)
📄 kern_mtxpool.c(5.82 KB)
📄 kern_mutex.c(33.62 KB)
📄 kern_ntptime.c(32.49 KB)
📄 kern_osd.c(12.37 KB)
📄 kern_physio.c(5.74 KB)
📄 kern_pmc.c(8.89 KB)
📄 kern_poll.c(15.86 KB)
📄 kern_priv.c(9.14 KB)
📄 kern_proc.c(80.01 KB)
📄 kern_procctl.c(19.48 KB)
📄 kern_prot.c(57.94 KB)
📄 kern_racct.c(34.01 KB)
📄 kern_rangelock.c(8.67 KB)
📄 kern_rctl.c(53.87 KB)
📄 kern_resource.c(36.66 KB)
📄 kern_rmlock.c(28.27 KB)
📄 kern_rwlock.c(40.72 KB)
📄 kern_sdt.c(2.05 KB)
📄 kern_sema.c(4.85 KB)
📄 kern_sendfile.c(33.97 KB)
📄 kern_sharedpage.c(10.37 KB)
📄 kern_shutdown.c(43.34 KB)
📄 kern_sig.c(101.89 KB)
📄 kern_switch.c(13.85 KB)
📄 kern_sx.c(40.27 KB)
📄 kern_synch.c(18.17 KB)
📄 kern_syscalls.c(6.74 KB)
📄 kern_sysctl.c(67.24 KB)
📄 kern_tc.c(55.73 KB)
📄 kern_thr.c(14.14 KB)
📄 kern_thread.c(41.75 KB)
📄 kern_time.c(40.89 KB)
📄 kern_timeout.c(43.08 KB)
📄 kern_tslog.c(3.44 KB)
📄 kern_ubsan.c(50.74 KB)
📄 kern_umtx.c(107.14 KB)
📄 kern_uuid.c(11.68 KB)
📄 kern_xxx.c(10.44 KB)
📄 ksched.c(6.56 KB)
📄 link_elf.c(47.99 KB)
📄 link_elf_obj.c(44.41 KB)
📄 linker_if.m(3.96 KB)
📄 makesyscalls.sh(23.57 KB)
📄 md4c.c(7.89 KB)
📄 md5c.c(9.56 KB)
📄 msi_if.m(2.48 KB)
📄 p1003_1b.c(8.84 KB)
📄 pic_if.m(3.9 KB)
📄 posix4_mib.c(5.59 KB)
📄 sched_4bsd.c(45.03 KB)
📄 sched_ule.c(82.65 KB)
📄 serdev_if.m(3.49 KB)
📄 stack_protector.c(613 B)
📄 subr_acl_nfs4.c(37.42 KB)
📄 subr_acl_posix1e.c(17.71 KB)
📄 subr_atomic64.c(3.97 KB)
📄 subr_autoconf.c(7.7 KB)
📄 subr_blist.c(31.88 KB)
📄 subr_boot.c(5.8 KB)
📄 subr_bufring.c(2.21 KB)
📄 subr_bus.c(145.4 KB)
📄 subr_bus_dma.c(19.67 KB)
📄 subr_busdma_bufalloc.c(5.24 KB)
📄 subr_capability.c(11.93 KB)
📄 subr_clock.c(10.61 KB)
📄 subr_compressor.c(13.11 KB)
📄 subr_counter.c(4.44 KB)
📄 subr_coverage.c(6.17 KB)
📄 subr_csan.c(25.39 KB)
📄 subr_devmap.c(9.8 KB)
📄 subr_devstat.c(16.21 KB)
📄 subr_disk.c(8.54 KB)
📄 subr_dummy_vdso_tc.c(1.7 KB)
📄 subr_early.c(2.26 KB)
📄 subr_epoch.c(25.02 KB)
📄 subr_eventhandler.c(9.17 KB)
📄 subr_fattime.c(9.98 KB)
📄 subr_filter.c(12.2 KB)
📄 subr_firmware.c(13.88 KB)
📄 subr_gtaskqueue.c(20.19 KB)
📄 subr_hash.c(4.8 KB)
📄 subr_hints.c(12.87 KB)
📄 subr_intr.c(40.61 KB)
📄 subr_kdb.c(16.13 KB)
📄 subr_kobj.c(7.1 KB)
📄 subr_lock.c(18.81 KB)
📄 subr_log.c(7.64 KB)
📄 subr_mchain.c(11.06 KB)
📄 subr_module.c(12.98 KB)
📄 subr_msgbuf.c(10.6 KB)
📄 subr_param.c(10.93 KB)
📄 subr_pcpu.c(10.18 KB)
📄 subr_pctrie.c(20.99 KB)
📄 subr_physmem.c(11.52 KB)
📄 subr_pidctrl.c(5.43 KB)
📄 subr_power.c(3.13 KB)
📄 subr_prf.c(27.42 KB)
📄 subr_prng.c(3.36 KB)
📄 subr_prof.c(15.43 KB)
📄 subr_rangeset.c(8.5 KB)
📄 subr_rman.c(27.61 KB)
📄 subr_rtc.c(11.42 KB)
📄 subr_sbuf.c(20.53 KB)
📄 subr_scanf.c(15.59 KB)
📄 subr_sfbuf.c(6.17 KB)
📄 subr_sglist.c(22.83 KB)
📄 subr_sleepqueue.c(39.43 KB)
📄 subr_smp.c(31.62 KB)
📄 subr_smr.c(20.17 KB)
📄 subr_stack.c(6.47 KB)
📄 subr_stats.c(103.01 KB)
📄 subr_syscall.c(7.98 KB)
📄 subr_taskqueue.c(21.1 KB)
📄 subr_terminal.c(15.52 KB)
📄 subr_trap.c(10.87 KB)
📄 subr_turnstile.c(35.58 KB)
📄 subr_uio.c(11.38 KB)
📄 subr_unit.c(22.97 KB)
📄 subr_vmem.c(43.25 KB)
📄 subr_witness.c(84.59 KB)
📄 sys_capability.c(15.06 KB)
📄 sys_eventfd.c(8.42 KB)
📄 sys_generic.c(44.22 KB)
📄 sys_getrandom.c(4.21 KB)
📄 sys_pipe.c(45.14 KB)
📄 sys_procdesc.c(14.57 KB)
📄 sys_process.c(30.73 KB)
📄 sys_socket.c(20.11 KB)
📄 syscalls.c(22.73 KB)
📄 syscalls.master(60.26 KB)
📄 systrace_args.c(178.49 KB)
📄 sysv_ipc.c(6.53 KB)
📄 sysv_msg.c(48.65 KB)
📄 sysv_sem.c(49.85 KB)
📄 sysv_shm.c(43.93 KB)
📄 tty.c(55.14 KB)
📄 tty_compat.c(11.46 KB)
📄 tty_info.c(9.93 KB)
📄 tty_inq.c(12.22 KB)
📄 tty_outq.c(8.74 KB)
📄 tty_pts.c(19.74 KB)
📄 tty_tty.c(2.83 KB)
📄 tty_ttydisc.c(28.6 KB)
📄 uipc_accf.c(8.07 KB)
📄 uipc_debug.c(12.42 KB)
📄 uipc_domain.c(13.13 KB)
📄 uipc_ktls.c(55.7 KB)
📄 uipc_mbuf.c(52.45 KB)
📄 uipc_mbuf2.c(12.64 KB)
📄 uipc_mbufhash.c(4.9 KB)
📄 uipc_mqueue.c(64.64 KB)
📄 uipc_sem.c(25.18 KB)
📄 uipc_shm.c(50.47 KB)
📄 uipc_sockbuf.c(42.9 KB)
📄 uipc_socket.c(110.61 KB)
📄 uipc_syscalls.c(35.94 KB)
📄 uipc_usrreq.c(75.11 KB)
📄 vfs_acl.c(14.5 KB)
📄 vfs_aio.c(76.32 KB)
📄 vfs_bio.c(145.39 KB)
📄 vfs_cache.c(143.09 KB)
📄 vfs_cluster.c(28.36 KB)
📄 vfs_default.c(33.16 KB)
📄 vfs_export.c(14.55 KB)
📄 vfs_extattr.c(17.91 KB)
📄 vfs_hash.c(6 KB)
📄 vfs_init.c(15.86 KB)
📄 vfs_lookup.c(45.48 KB)
📄 vfs_mount.c(62.58 KB)
📄 vfs_mountroot.c(26.23 KB)
📄 vfs_subr.c(167.52 KB)
📄 vfs_syscalls.c(106.86 KB)
📄 vfs_vnops.c(86.28 KB)
📄 vnode_if.src(13.66 KB)

Editing: subr_trap.c

/*-
 * SPDX-License-Identifier: BSD-4-Clause
 *
 * Copyright (C) 1994, David Greenman
 * Copyright (c) 1990, 1993
 *	The Regents of the University of California.  All rights reserved.
 * Copyright (c) 2007 The FreeBSD Foundation
 *
 * This code is derived from software contributed to Berkeley by
 * the University of Utah, and William Jolitz.
 *
 * Portions of this software were developed by A. Joseph Koshy under
 * sponsorship from the FreeBSD Foundation and Google, Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	from: @(#)trap.c	7.4 (Berkeley) 5/13/91
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include "opt_hwpmc_hooks.h"
#include "opt_ktrace.h"
#include "opt_sched.h"

#include <sys/param.h>
#include <sys/bus.h>
#include <sys/capsicum.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/pmckern.h>
#include <sys/proc.h>
#include <sys/ktr.h>
#include <sys/ptrace.h>
#include <sys/racct.h>
#include <sys/resourcevar.h>
#include <sys/sched.h>
#include <sys/signalvar.h>
#include <sys/syscall.h>
#include <sys/syscallsubr.h>
#include <sys/sysent.h>
#include <sys/systm.h>
#include <sys/vmmeter.h>
#ifdef KTRACE
#include <sys/uio.h>
#include <sys/ktrace.h>
#endif
#include <security/audit/audit.h>

#include <machine/cpu.h>

#ifdef VIMAGE
#include <net/vnet.h>
#endif

#ifdef	HWPMC_HOOKS
#include <sys/pmckern.h>
#endif

#include <security/mac/mac_framework.h>

void (*softdep_ast_cleanup)(struct thread *);

/*
 * Define the code needed before returning to user mode, for trap and
 * syscall.
 */
void
userret(struct thread *td, struct trapframe *frame)
{
	struct proc *p = td->td_proc;

CTR3(KTR_SYSC, "userret: thread %p (pid %d, %s)", td, p->p_pid,
            td->td_name);
	KASSERT((p->p_flag & P_WEXIT) == 0,
	    ("Exiting process returns to usermode"));
#ifdef DIAGNOSTIC
	/*
	 * Check that we called signotify() enough.  For
	 * multi-threaded processes, where signal distribution might
	 * change due to other threads changing sigmask, the check is
	 * racy and cannot be performed reliably.
	 * If current process is vfork child, indicated by P_PPWAIT, then
	 * issignal() ignores stops, so we block the check to avoid
	 * classifying pending signals.
	 */
	if (p->p_numthreads == 1) {
		PROC_LOCK(p);
		thread_lock(td);
		if ((p->p_flag & P_PPWAIT) == 0 &&
		    (td->td_pflags & TDP_SIGFASTBLOCK) == 0) {
			if (SIGPENDING(td) && (td->td_flags &
			    (TDF_NEEDSIGCHK | TDF_ASTPENDING)) !=
			    (TDF_NEEDSIGCHK | TDF_ASTPENDING)) {
				thread_unlock(td);
				panic(
	"failed to set signal flags for ast p %p td %p fl %x",
				    p, td, td->td_flags);
			}
		}
		thread_unlock(td);
		PROC_UNLOCK(p);
	}
#endif

/*
	 * Charge system time if profiling.
	 */
	if (__predict_false(p->p_flag & P_PROFIL))
		addupc_task(td, TRAPF_PC(frame), td->td_pticks * psratio);

#ifdef HWPMC_HOOKS
	if (PMC_THREAD_HAS_SAMPLES(td))
		PMC_CALL_HOOK(td, PMC_FN_THR_USERRET, NULL);
#endif
	/*
	 * Let the scheduler adjust our priority etc.
	 */
	sched_userret(td);

/*
	 * Check for misbehavior.
	 *
	 * In case there is a callchain tracing ongoing because of
	 * hwpmc(4), skip the scheduler pinning check.
	 * hwpmc(4) subsystem, infact, will collect callchain informations
	 * at ast() checkpoint, which is past userret().
	 */
	WITNESS_WARN(WARN_PANIC, NULL, "userret: returning");
	KASSERT(td->td_critnest == 0,
	    ("userret: Returning in a critical section"));
	KASSERT(td->td_locks == 0,
	    ("userret: Returning with %d locks held", td->td_locks));
	KASSERT(td->td_rw_rlocks == 0,
	    ("userret: Returning with %d rwlocks held in read mode",
	    td->td_rw_rlocks));
	KASSERT(td->td_sx_slocks == 0,
	    ("userret: Returning with %d sx locks held in shared mode",
	    td->td_sx_slocks));
	KASSERT(td->td_lk_slocks == 0,
	    ("userret: Returning with %d lockmanager locks held in shared mode",
	    td->td_lk_slocks));
	KASSERT((td->td_pflags & TDP_NOFAULTING) == 0,
	    ("userret: Returning with pagefaults disabled"));
	if (__predict_false(!THREAD_CAN_SLEEP())) {
#ifdef EPOCH_TRACE
		epoch_trace_list(curthread);
#endif
		KASSERT(0, ("userret: Returning with sleep disabled"));
	}
	KASSERT(td->td_pinned == 0 || (td->td_pflags & TDP_CALLCHAIN) != 0,
	    ("userret: Returning with with pinned thread"));
	KASSERT(td->td_vp_reserved == NULL,
	    ("userret: Returning with preallocated vnode"));
	KASSERT((td->td_flags & (TDF_SBDRY | TDF_SEINTR | TDF_SERESTART)) == 0,
	    ("userret: Returning with stop signals deferred"));
	KASSERT(td->td_vslock_sz == 0,
	    ("userret: Returning with vslock-wired space"));
#ifdef VIMAGE
	/* Unfortunately td_vnet_lpush needs VNET_DEBUG. */
	VNET_ASSERT(curvnet == NULL,
	    ("%s: Returning on td %p (pid %d, %s) with vnet %p set in %s",
	    __func__, td, p->p_pid, td->td_name, curvnet,
	    (td->td_vnet_lpush != NULL) ? td->td_vnet_lpush : "N/A"));
#endif
}

/*
 * Process an asynchronous software trap.
 * This is relatively easy.
 * This function will return with preemption disabled.
 */
void
ast(struct trapframe *framep)
{
	struct thread *td;
	struct proc *p;
	int flags, sig;
	bool resched_sigs;

td = curthread;
	p = td->td_proc;

CTR3(KTR_SYSC, "ast: thread %p (pid %d, %s)", td, p->p_pid,
            p->p_comm);
	KASSERT(TRAPF_USERMODE(framep), ("ast in kernel mode"));
	WITNESS_WARN(WARN_PANIC, NULL, "Returning to user mode");
	mtx_assert(&Giant, MA_NOTOWNED);
	THREAD_LOCK_ASSERT(td, MA_NOTOWNED);
	td->td_frame = framep;
	td->td_pticks = 0;

/*
	 * This updates the td_flag's for the checks below in one
	 * "atomic" operation with turning off the astpending flag.
	 * If another AST is triggered while we are handling the
	 * AST's saved in flags, the astpending flag will be set and
	 * ast() will be called again.
	 */
	thread_lock(td);
	flags = td->td_flags;
	td->td_flags &= ~(TDF_ASTPENDING | TDF_NEEDSIGCHK | TDF_NEEDSUSPCHK |
	    TDF_NEEDRESCHED | TDF_ALRMPEND | TDF_PROFPEND | TDF_MACPEND);
	thread_unlock(td);
	VM_CNT_INC(v_trap);

if (td->td_cowgen != p->p_cowgen)
		thread_cow_update(td);
	if (td->td_pflags & TDP_OWEUPC && p->p_flag & P_PROFIL) {
		addupc_task(td, td->td_profil_addr, td->td_profil_ticks);
		td->td_profil_ticks = 0;
		td->td_pflags &= ~TDP_OWEUPC;
	}
#ifdef HWPMC_HOOKS
	/* Handle Software PMC callchain capture. */
	if (PMC_IS_PENDING_CALLCHAIN(td))
		PMC_CALL_HOOK_UNLOCKED(td, PMC_FN_USER_CALLCHAIN_SOFT, (void *) framep);
#endif
	if (flags & TDF_ALRMPEND) {
		PROC_LOCK(p);
		kern_psignal(p, SIGVTALRM);
		PROC_UNLOCK(p);
	}
	if (flags & TDF_PROFPEND) {
		PROC_LOCK(p);
		kern_psignal(p, SIGPROF);
		PROC_UNLOCK(p);
	}
#ifdef MAC
	if (flags & TDF_MACPEND)
		mac_thread_userret(td);
#endif
	if (flags & TDF_NEEDRESCHED) {
#ifdef KTRACE
		if (KTRPOINT(td, KTR_CSW))
			ktrcsw(1, 1, __func__);
#endif
		thread_lock(td);
		sched_prio(td, td->td_user_pri);
		mi_switch(SW_INVOL | SWT_NEEDRESCHED);
#ifdef KTRACE
		if (KTRPOINT(td, KTR_CSW))
			ktrcsw(0, 1, __func__);
#endif
	}

td_softdep_cleanup(td);
	MPASS(td->td_su == NULL);

/*
	 * If this thread tickled GEOM, we need to wait for the giggling to
	 * stop before we return to userland
	 */
	if (__predict_false(td->td_pflags & TDP_GEOM))
		g_waitidle();

#ifdef DIAGNOSTIC
	if (p->p_numthreads == 1 && (flags & TDF_NEEDSIGCHK) == 0) {
		PROC_LOCK(p);
		thread_lock(td);
		/*
		 * Note that TDF_NEEDSIGCHK should be re-read from
		 * td_flags, since signal might have been delivered
		 * after we cleared td_flags above.  This is one of
		 * the reason for looping check for AST condition.
		 * See comment in userret() about P_PPWAIT.
		 */
		if ((p->p_flag & P_PPWAIT) == 0 &&
		    (td->td_pflags & TDP_SIGFASTBLOCK) == 0) {
			if (SIGPENDING(td) && (td->td_flags &
			    (TDF_NEEDSIGCHK | TDF_ASTPENDING)) !=
			    (TDF_NEEDSIGCHK | TDF_ASTPENDING)) {
				thread_unlock(td); /* fix dumps */
				panic(
	"failed2 to set signal flags for ast p %p td %p fl %x %x",
				    p, td, flags, td->td_flags);
			}
		}
		thread_unlock(td);
		PROC_UNLOCK(p);
	}
#endif

/*
	 * Check for signals. Unlocked reads of p_pendingcnt or
	 * p_siglist might cause process-directed signal to be handled
	 * later.
	 */
	if (flags & TDF_NEEDSIGCHK || p->p_pendingcnt > 0 ||
	    !SIGISEMPTY(p->p_siglist)) {
		sigfastblock_fetch(td);
		PROC_LOCK(p);
		mtx_lock(&p->p_sigacts->ps_mtx);
		while ((sig = cursig(td)) != 0) {
			KASSERT(sig >= 0, ("sig %d", sig));
			postsig(sig);
		}
		mtx_unlock(&p->p_sigacts->ps_mtx);
		PROC_UNLOCK(p);
		resched_sigs = true;
	} else {
		resched_sigs = false;
	}

/*
	 * Handle deferred update of the fast sigblock value, after
	 * the postsig() loop was performed.
	 */
	sigfastblock_setpend(td, resched_sigs);

#ifdef KTRACE
	KTRUSERRET(td);
#endif

/*
	 * We need to check to see if we have to exit or wait due to a
	 * single threading requirement or some other STOP condition.
	 */
	if (flags & TDF_NEEDSUSPCHK) {
		PROC_LOCK(p);
		thread_suspend_check(0);
		PROC_UNLOCK(p);
	}

if (td->td_pflags & TDP_OLDMASK) {
		td->td_pflags &= ~TDP_OLDMASK;
		kern_sigprocmask(td, SIG_SETMASK, &td->td_oldsigmask, NULL, 0);
	}

#ifdef RACCT
	if (__predict_false(racct_enable && p->p_throttled != 0))
		racct_proc_throttled(p);
#endif

userret(td, framep);
}

const char *
syscallname(struct proc *p, u_int code)
{
	static const char unknown[] = "unknown";
	struct sysentvec *sv;

sv = p->p_sysent;
	if (sv->sv_syscallnames == NULL || code >= sv->sv_size)
		return (unknown);
	return (sv->sv_syscallnames[code]);
}

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