FreeBSD-5.3/sys/kern/subr_trap.c
/*-
* Copyright (C) 1994, David Greenman
* Copyright (c) 1990, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* the University of Utah, and William Jolitz.
*
* 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: src/sys/kern/subr_trap.c,v 1.270.2.2 2004/09/03 06:40:25 julian Exp $");
#include "opt_ktrace.h"
#include "opt_mac.h"
#ifdef __i386__
#include "opt_npx.h"
#endif
#include <sys/param.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/mac.h>
#include <sys/mutex.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>
/*
* Define the code needed before returning to user mode, for
* trap and syscall.
*
* MPSAFE
*/
void
userret(td, frame, oticks)
struct thread *td;
struct trapframe *frame;
u_int oticks;
{
struct proc *p = td->td_proc;
CTR3(KTR_SYSC, "userret: thread %p (pid %d, %s)", td, p->p_pid,
p->p_comm);
#ifdef DIAGNOSTIC
/* Check that we called signotify() enough. */
PROC_LOCK(p);
mtx_lock_spin(&sched_lock);
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");
mtx_unlock_spin(&sched_lock);
PROC_UNLOCK(p);
#endif
/*
* Let the scheduler adjust our priority etc.
*/
sched_userret(td);
/*
* 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);
}
/*
* Do special thread processing, e.g. upcall tweaking and such.
*/
if (p->p_flag & P_SA)
thread_userret(td, frame);
/*
* Charge system time if profiling.
*/
if (p->p_flag & P_PROFIL) {
quad_t ticks;
mtx_lock_spin(&sched_lock);
ticks = td->td_sticks - oticks;
mtx_unlock_spin(&sched_lock);
addupc_task(td, TRAPF_PC(frame), (u_int)ticks * psratio);
}
}
/*
* 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;
struct ksegrp *kg;
struct rlimit rlim;
u_int sticks;
int sflag;
int flags;
int sig;
#if defined(DEV_NPX) && !defined(SMP)
int ucode;
#endif
td = curthread;
p = td->td_proc;
kg = td->td_ksegrp;
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);
mtx_assert(&sched_lock, MA_NOTOWNED);
td->td_frame = framep;
if ((p->p_flag & P_SA) && (td->td_mailbox == NULL))
thread_user_enter(td);
/*
* This updates the p_sflag'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 sflag, the astpending flag will be set and
* ast() will be called again.
*/
mtx_lock_spin(&sched_lock);
sticks = td->td_sticks;
flags = td->td_flags;
sflag = p->p_sflag;
p->p_sflag &= ~(PS_ALRMPEND | PS_PROFPEND | PS_XCPU);
#ifdef MAC
p->p_sflag &= ~PS_MACPEND;
#endif
td->td_flags &= ~(TDF_ASTPENDING | TDF_NEEDSIGCHK |
TDF_NEEDRESCHED | TDF_INTERRUPT);
cnt.v_soft++;
mtx_unlock_spin(&sched_lock);
/*
* XXXKSE While the fact that we owe a user profiling
* tick is stored per KSE 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 (sflag & PS_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) {
trapsignal(td, SIGFPE, ucode);
}
}
#endif
if (sflag & PS_PROFPEND) {
PROC_LOCK(p);
psignal(p, SIGPROF);
PROC_UNLOCK(p);
}
if (sflag & PS_XCPU) {
PROC_LOCK(p);
lim_rlimit(p, RLIMIT_CPU, &rlim);
mtx_lock_spin(&sched_lock);
if (p->p_runtime.sec >= rlim.rlim_max) {
mtx_unlock_spin(&sched_lock);
killproc(p, "exceeded maximum CPU limit");
} else {
if (p->p_cpulimit < rlim.rlim_max)
p->p_cpulimit += 5;
mtx_unlock_spin(&sched_lock);
psignal(p, SIGXCPU);
}
PROC_UNLOCK(p);
}
#ifdef MAC
if (sflag & PS_MACPEND)
mac_thread_userret(td);
#endif
if (flags & TDF_NEEDRESCHED) {
#ifdef KTRACE
if (KTRPOINT(td, KTR_CSW))
ktrcsw(1, 1);
#endif
mtx_lock_spin(&sched_lock);
sched_prio(td, kg->kg_user_pri);
mi_switch(SW_INVOL, NULL);
mtx_unlock_spin(&sched_lock);
#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, sticks);
mtx_assert(&Giant, MA_NOTOWNED);
}