271 lines
7.4 KiB
C
271 lines
7.4 KiB
C
/*-
|
|
* 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_mac.h"
|
|
#ifdef __i386__
|
|
#include "opt_npx.h"
|
|
#endif
|
|
#include "opt_sched.h"
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/bus.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/resourcevar.h>
|
|
#include <sys/sched.h>
|
|
#include <sys/signalvar.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/vmmeter.h>
|
|
#ifdef KTRACE
|
|
#include <sys/uio.h>
|
|
#include <sys/ktrace.h>
|
|
#endif
|
|
|
|
#include <machine/cpu.h>
|
|
#include <machine/pcb.h>
|
|
|
|
#include <security/mac/mac_framework.h>
|
|
|
|
/*
|
|
* 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);
|
|
#ifdef DIAGNOSTIC
|
|
/* Check that we called signotify() enough. */
|
|
PROC_LOCK(p);
|
|
thread_lock(td);
|
|
if (SIGPENDING(td) && ((td->td_flags & TDF_NEEDSIGCHK) == 0 ||
|
|
(td->td_flags & TDF_ASTPENDING) == 0))
|
|
printf("failed to set signal flags properly for ast()\n");
|
|
thread_unlock(td);
|
|
PROC_UNLOCK(p);
|
|
#endif
|
|
|
|
#ifdef KTRACE
|
|
KTRUSERRET(td);
|
|
#endif
|
|
|
|
/*
|
|
* If this thread tickled GEOM, we need to wait for the giggling to
|
|
* stop before we return to userland
|
|
*/
|
|
if (td->td_pflags & TDP_GEOM)
|
|
g_waitidle();
|
|
|
|
/*
|
|
* We need to check to see if we have to exit or wait due to a
|
|
* single threading requirement or some other STOP condition.
|
|
* Don't bother doing all the work if the stop bits are not set
|
|
* at this time.. If we miss it, we miss it.. no big deal.
|
|
*/
|
|
if (P_SHOULDSTOP(p)) {
|
|
PROC_LOCK(p);
|
|
thread_suspend_check(0); /* Can suspend or kill */
|
|
PROC_UNLOCK(p);
|
|
}
|
|
|
|
#ifdef KSE
|
|
/*
|
|
* Do special thread processing, e.g. upcall tweaking and such.
|
|
*/
|
|
if (p->p_flag & P_SA)
|
|
thread_userret(td, frame);
|
|
#endif
|
|
|
|
/*
|
|
* Charge system time if profiling.
|
|
*/
|
|
if (p->p_flag & P_PROFIL) {
|
|
|
|
addupc_task(td, TRAPF_PC(frame), td->td_pticks * psratio);
|
|
}
|
|
|
|
/*
|
|
* Let the scheduler adjust our priority etc.
|
|
*/
|
|
sched_userret(td);
|
|
KASSERT(td->td_locks == 0,
|
|
("userret: Returning with %d locks held.", td->td_locks));
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
int sig;
|
|
#if defined(DEV_NPX) && !defined(SMP)
|
|
int ucode;
|
|
ksiginfo_t ksi;
|
|
#endif
|
|
|
|
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;
|
|
|
|
#ifdef KSE
|
|
if ((p->p_flag & P_SA) && (td->td_mailbox == NULL))
|
|
thread_user_enter(td);
|
|
#endif
|
|
|
|
/*
|
|
* 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_NEEDRESCHED | TDF_INTERRUPT | TDF_ALRMPEND | TDF_PROFPEND |
|
|
TDF_MACPEND);
|
|
thread_unlock(td);
|
|
PCPU_INC(cnt.v_trap);
|
|
|
|
/*
|
|
* XXXKSE While the fact that we owe a user profiling
|
|
* tick is stored per thread in this code, the statistics
|
|
* themselves are still stored per process.
|
|
* This should probably change, by which I mean that
|
|
* possibly the location of both might change.
|
|
*/
|
|
if (td->td_ucred != p->p_ucred)
|
|
cred_update_thread(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;
|
|
}
|
|
#if defined(HWPMC_HOOKS)
|
|
if (td->td_pflags & TDP_CALLCHAIN) {
|
|
PMC_CALL_HOOK_UNLOCKED(td, PMC_FN_USER_CALLCHAIN,
|
|
(void *) framep);
|
|
td->td_pflags &= ~TDP_CALLCHAIN;
|
|
}
|
|
#endif
|
|
if (flags & TDF_ALRMPEND) {
|
|
PROC_LOCK(p);
|
|
psignal(p, SIGVTALRM);
|
|
PROC_UNLOCK(p);
|
|
}
|
|
#if defined(DEV_NPX) && !defined(SMP)
|
|
if (PCPU_GET(curpcb)->pcb_flags & PCB_NPXTRAP) {
|
|
atomic_clear_int(&PCPU_GET(curpcb)->pcb_flags,
|
|
PCB_NPXTRAP);
|
|
ucode = npxtrap();
|
|
if (ucode != -1) {
|
|
ksiginfo_init_trap(&ksi);
|
|
ksi.ksi_signo = SIGFPE;
|
|
ksi.ksi_code = ucode;
|
|
trapsignal(td, &ksi);
|
|
}
|
|
}
|
|
#endif
|
|
if (flags & TDF_PROFPEND) {
|
|
PROC_LOCK(p);
|
|
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);
|
|
#endif
|
|
thread_lock(td);
|
|
sched_prio(td, td->td_user_pri);
|
|
SCHED_STAT_INC(switch_needresched);
|
|
mi_switch(SW_INVOL, NULL);
|
|
thread_unlock(td);
|
|
#ifdef KTRACE
|
|
if (KTRPOINT(td, KTR_CSW))
|
|
ktrcsw(0, 1);
|
|
#endif
|
|
}
|
|
if (flags & TDF_NEEDSIGCHK) {
|
|
PROC_LOCK(p);
|
|
mtx_lock(&p->p_sigacts->ps_mtx);
|
|
while ((sig = cursig(td)) != 0)
|
|
postsig(sig);
|
|
mtx_unlock(&p->p_sigacts->ps_mtx);
|
|
PROC_UNLOCK(p);
|
|
}
|
|
|
|
userret(td, framep);
|
|
mtx_assert(&Giant, MA_NOTOWNED);
|
|
}
|