568 lines
14 KiB
C
568 lines
14 KiB
C
/*-
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* the University of Utah, and William Jolitz.
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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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* 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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: @(#)trap.c 7.4 (Berkeley) 5/13/91
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* $Id: trap.c,v 1.36 1994/04/02 22:15:03 mycroft Exp $
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*/
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/*
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* 386 Trap and System call handling
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/proc.h>
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#include <sys/user.h>
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#include <sys/acct.h>
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#include <sys/kernel.h>
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#include <sys/signal.h>
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#ifdef KTRACE
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#include <sys/ktrace.h>
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#endif
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#include <sys/vmmeter.h>
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#include <sys/syscall.h>
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#include <vm/vm_param.h>
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#include <vm/pmap.h>
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#include <vm/vm_map.h>
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#include <machine/cpu.h>
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#include <machine/cpufunc.h>
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#include <machine/psl.h>
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#include <machine/reg.h>
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#include <machine/trap.h>
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#include "npx.h"
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struct sysent sysent[];
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int nsysent;
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extern int cpl;
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/*
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* Define the code needed before returning to user mode, for
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* trap and syscall.
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*/
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static inline void
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userret(p, pc, oticks)
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register struct proc *p;
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int pc;
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struct timeval oticks;
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{
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int sig;
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/* take pending signals */
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while ((sig = CURSIG(p)) != 0)
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psig(sig);
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p->p_pri = p->p_usrpri;
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if (want_resched) {
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/*
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* Since we are curproc, a clock interrupt could
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* change our priority without changing run queues
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* (the running process is not kept on a run queue).
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* If this happened after we setrq ourselves but
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* before we swtch()'ed, we might not be on the queue
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* indicated by our priority.
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*/
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(void) splclock();
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setrq(p);
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p->p_stats->p_ru.ru_nivcsw++;
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swtch();
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(void) spl0();
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while ((sig = CURSIG(p)) != 0)
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psig(sig);
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}
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/*
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* If profiling, charge recent system time to the trapped pc.
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*/
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if (p->p_stats->p_prof.pr_scale) {
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int ticks;
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struct timeval *tv = &p->p_stime;
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ticks = ((tv->tv_sec - oticks.tv_sec) * 1000 +
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(tv->tv_usec - oticks.tv_usec) / 1000) / (tick / 1000);
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if (ticks) {
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#ifdef PROFTIMER
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extern int profscale;
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addupc(pc, &p->p_stats->p_prof, ticks * profscale);
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#else
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addupc(pc, &p->p_stats->p_prof, ticks);
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#endif
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}
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}
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curpri = p->p_pri;
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}
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char *trap_type[] = {
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"privileged instruction fault", /* 0 T_PRIVINFLT */
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"breakpoint trap", /* 1 T_BPTFLT */
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"arithmetic trap", /* 2 T_ARITHTRAP */
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"asynchronous system trap", /* 3 T_ASTFLT */
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"protection fault", /* 4 T_PROTFLT */
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"trace trap", /* 5 T_TRCTRAP */
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"page fault", /* 6 T_PAGEFLT */
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"alignment fault", /* 7 T_ALIGNFLT */
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"integer divide fault", /* 8 T_DIVIDE */
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"non-maskable interrupt", /* 9 T_NMI */
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"overflow trap", /* 10 T_OFLOW */
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"bounds check fault", /* 11 T_BOUND */
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"FPU not available fault", /* 12 T_DNA */
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"double fault", /* 13 T_DOUBLEFLT */
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"FPU operand fetch fault", /* 14 T_FPOPFLT */
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"invalid TSS fault", /* 15 T_TSSFLT */
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"segment not present fault", /* 16 T_SEGNPFLT */
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"stack fault", /* 17 T_STKFLT */
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};
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int trap_types = sizeof trap_type / sizeof trap_type[0];
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/*
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* trap(frame):
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* Exception, fault, and trap interface to BSD kernel. This
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* common code is called from assembly language IDT gate entry
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* routines that prepare a suitable stack frame, and restore this
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* frame after the exception has been processed. Note that the
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* effect is as if the arguments were passed call by reference.
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*/
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/*ARGSUSED*/
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void
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trap(frame)
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struct trapframe frame;
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{
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register struct proc *p;
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register struct pcb *pcb;
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int type, code;
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struct timeval sticks;
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extern char fusubail[];
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cnt.v_trap++;
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#ifdef DEBUG
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printf("trap type %d code %x eip %x cs %x eflags %x cr2 %x cpl %x\n",
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frame.tf_trapno, frame.tf_err, frame.tf_eip, frame.tf_cs,
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frame.tf_eflags, rcr2(), cpl);
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printf("curproc %x\n", curproc);
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#endif
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frame.tf_eflags &= ~PSL_NT; /* clear nested trap XXX */
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type = frame.tf_trapno;
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if ((p = curproc) == 0)
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p = &proc0;
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/* can't use curpcb, as it might be NULL; and we have p in a register
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anyway */
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pcb = &p->p_addr->u_pcb;
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if (pcb == 0)
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goto we_re_toast;
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/* fusubail is used by [fs]uswintr to avoid page faulting */
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if (pcb->pcb_onfault &&
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(type != T_PAGEFLT || pcb->pcb_onfault == fusubail)) {
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copyfault:
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frame.tf_eip = (int)pcb->pcb_onfault;
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return;
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}
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if (ISPL(frame.tf_cs) != SEL_KPL) {
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type |= T_USER;
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sticks = p->p_stime;
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p->p_regs = (int *)&frame;
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}
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code = frame.tf_err;
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switch (type) {
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default:
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we_re_toast:
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#ifdef KDB /* XXX KGDB? */
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if (kdb_trap(&psl))
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return;
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#endif
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#ifdef DDB
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if (kdb_trap(type, 0, &frame))
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return;
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#endif
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if (frame.tf_trapno < trap_types)
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printf("fatal %s", trap_type[frame.tf_trapno]);
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else
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printf("unknown trap %d", frame.tf_trapno);
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printf(" in %s mode\n", (type & T_USER) ? "user" : "supervisor");
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printf("trap type %d code %x eip %x cs %x eflags %x cr2 %x cpl %x\n",
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type, code, frame.tf_eip, frame.tf_cs, frame.tf_eflags, rcr2(), cpl);
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panic("trap");
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/*NOTREACHED*/
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case T_SEGNPFLT|T_USER:
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case T_STKFLT|T_USER:
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case T_PROTFLT|T_USER: /* protection fault */
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case T_ALIGNFLT|T_USER:
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trapsignal(p, SIGBUS, type &~ T_USER);
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break;
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case T_PRIVINFLT|T_USER: /* privileged instruction fault */
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case T_FPOPFLT|T_USER: /* coprocessor operand fault */
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trapsignal(p, SIGILL, type &~ T_USER);
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break;
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case T_ASTFLT|T_USER: /* Allow process switch */
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cnt.v_soft++;
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if ((p->p_flag & SOWEUPC) && p->p_stats->p_prof.pr_scale) {
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addupc(frame.tf_eip, &p->p_stats->p_prof, 1);
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p->p_flag &= ~SOWEUPC;
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}
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goto out;
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case T_DNA|T_USER: {
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int rv;
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#if NNPX > 0
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/* if a transparent fault (due to context switch "late") */
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if (npxdna())
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return;
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#endif
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#ifdef MATH_EMULATE
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rv = math_emulate(&frame);
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if (rv == 0) {
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if (frame.tf_eflags & PSL_T)
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goto trace;
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return;
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}
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#else
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printf("pid %d killed due to lack of floating point\n",
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p->p_pid);
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rv = SIGKILL;
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#endif
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trapsignal(p, rv, type &~ T_USER);
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break;
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}
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case T_BOUND|T_USER:
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case T_OFLOW|T_USER:
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case T_DIVIDE|T_USER:
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trapsignal(p, SIGFPE, type &~ T_USER);
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break;
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case T_ARITHTRAP|T_USER:
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trapsignal(p, SIGFPE, code);
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break;
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case T_PAGEFLT: /* allow page faults in kernel mode */
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#if 0
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/* XXX - check only applies to 386's and 486's with WP off */
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if (code & PGEX_P)
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goto we_re_toast;
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#endif
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/*FALLTHROUGH*/
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case T_PAGEFLT|T_USER: { /* page fault */
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register vm_offset_t va;
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register struct vmspace *vm = p->p_vmspace;
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register vm_map_t map;
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int rv;
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vm_prot_t ftype;
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extern vm_map_t kernel_map;
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unsigned nss, v;
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va = trunc_page((vm_offset_t)rcr2());
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/*
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* It is only a kernel address space fault iff:
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* 1. (type & T_USER) == 0 and
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* 2. pcb_onfault not set or
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* 3. pcb_onfault set but supervisor space fault
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* The last can occur during an exec() copyin where the
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* argument space is lazy-allocated.
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*/
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if (type == T_PAGEFLT && va >= KERNBASE)
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map = kernel_map;
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else
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map = &vm->vm_map;
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if (code & PGEX_W)
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ftype = VM_PROT_READ | VM_PROT_WRITE;
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else
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ftype = VM_PROT_READ;
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#ifdef DIAGNOSTIC
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if (map == kernel_map && va == 0) {
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printf("trap: bad kernel access at %x\n", va);
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goto we_re_toast;
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}
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#endif
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nss = 0;
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if ((caddr_t)va >= vm->vm_maxsaddr
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&& (caddr_t)va < (caddr_t)VM_MAXUSER_ADDRESS
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&& map != kernel_map) {
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nss = clrnd(btoc(USRSTACK-(unsigned)va));
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if (nss > btoc(p->p_rlimit[RLIMIT_STACK].rlim_cur)) {
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rv = KERN_FAILURE;
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goto nogo;
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}
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}
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/* check if page table is mapped, if not, fault it first */
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if (!PTD[pdei(va)].pd_v) {
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v = trunc_page(vtopte(va));
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rv = vm_fault(map, v, ftype, FALSE);
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if (rv != KERN_SUCCESS)
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goto nogo;
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/* check if page table fault, increment wiring */
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vm_map_pageable(map, v, round_page(v+1), FALSE);
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} else
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v = 0;
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rv = vm_fault(map, va, ftype, FALSE);
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if (rv == KERN_SUCCESS) {
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if (nss > vm->vm_ssize)
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vm->vm_ssize = nss;
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va = trunc_page(vtopte(va));
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/* for page table, increment wiring as long as
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not a page table fault as well */
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if (!v && map != kernel_map)
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vm_map_pageable(map, va, round_page(va+1),
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FALSE);
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if (type == T_PAGEFLT)
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return;
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goto out;
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}
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nogo:
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if (type == T_PAGEFLT) {
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if (pcb->pcb_onfault)
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goto copyfault;
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printf("vm_fault(%x, %x, %x, 0) -> %x\n",
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map, va, ftype, rv);
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goto we_re_toast;
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}
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trapsignal(p, (rv == KERN_PROTECTION_FAILURE)
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? SIGBUS : SIGSEGV, T_PAGEFLT);
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break;
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}
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#ifndef DDB
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/* XXX need to deal with this when DDB is present, too */
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case T_TRCTRAP: /* kernel trace trap; someone single stepping lcall's */
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/* syscall has to turn off the trace bit itself */
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return;
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#endif
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case T_BPTFLT|T_USER: /* bpt instruction fault */
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case T_TRCTRAP|T_USER: /* trace trap */
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trace:
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frame.tf_eflags &= ~PSL_T;
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trapsignal(p, SIGTRAP, type &~ T_USER);
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break;
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#include "isa.h"
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#if NISA > 0
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case T_NMI:
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case T_NMI|T_USER:
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#ifdef DDB
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/* NMI can be hooked up to a pushbutton for debugging */
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printf ("NMI ... going to debugger\n");
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if (kdb_trap (type, 0, &frame))
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return;
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#endif
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/* machine/parity/power fail/"kitchen sink" faults */
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if (isa_nmi() == 0)
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return;
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else
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goto we_re_toast;
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#endif
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}
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if ((type & T_USER) == 0)
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return;
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out:
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userret(p, frame.tf_eip, sticks);
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}
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/*
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* Compensate for 386 brain damage (missing URKR)
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*/
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int
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trapwrite(addr)
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unsigned addr;
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{
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vm_offset_t va;
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unsigned nss;
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struct proc *p;
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struct vmspace *vm;
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va = trunc_page((vm_offset_t)addr);
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if (va >= VM_MAXUSER_ADDRESS)
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return 1;
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nss = 0;
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p = curproc;
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vm = p->p_vmspace;
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if ((caddr_t)va >= vm->vm_maxsaddr) {
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nss = clrnd(btoc(USRSTACK-(unsigned)va));
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if (nss > btoc(p->p_rlimit[RLIMIT_STACK].rlim_cur))
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return 1;
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}
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if (vm_fault(&vm->vm_map, va, VM_PROT_READ | VM_PROT_WRITE, FALSE)
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!= KERN_SUCCESS)
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return 1;
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if (nss > vm->vm_ssize)
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vm->vm_ssize = nss;
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return 0;
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}
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/*
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* syscall(frame):
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* System call request from POSIX system call gate interface to kernel.
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* Like trap(), argument is call by reference.
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*/
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/*ARGSUSED*/
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void
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syscall(frame)
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volatile struct trapframe frame;
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{
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register caddr_t params;
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register struct sysent *callp;
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register struct proc *p;
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int error, opc;
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u_int argsize;
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int args[8], rval[2];
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int code;
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struct timeval sticks;
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cnt.v_syscall++;
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if (ISPL(frame.tf_cs) != SEL_UPL)
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panic("syscall");
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p = curproc;
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sticks = p->p_stime;
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p->p_regs = (int *)&frame;
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opc = frame.tf_eip;
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code = frame.tf_eax;
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params = (caddr_t)frame.tf_esp + sizeof(int);
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switch (code) {
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case SYS_syscall:
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code = fuword(params);
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params += sizeof(int);
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break;
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case SYS___syscall:
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code = fuword(params + _QUAD_LOWWORD * sizeof(int));
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params += sizeof(quad_t);
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break;
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default:
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/* do nothing by default */
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break;
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}
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if (code < 0 || code >= nsysent)
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callp = &sysent[0]; /* illegal */
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else
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callp = &sysent[code];
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argsize = callp->sy_narg * sizeof(int);
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if (argsize && (error = copyin(params, (caddr_t)args, argsize))) {
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#ifdef SYSCALL_DEBUG
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scdebug_call(p, code, callp->sy_narg, args);
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#endif
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#ifdef KTRACE
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if (KTRPOINT(p, KTR_SYSCALL))
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ktrsyscall(p->p_tracep, code, callp->sy_narg, &args);
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#endif
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goto bad;
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}
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#ifdef SYSCALL_DEBUG
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scdebug_call(p, code, callp->sy_narg, args);
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#endif
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#ifdef KTRACE
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if (KTRPOINT(p, KTR_SYSCALL))
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ktrsyscall(p->p_tracep, code, callp->sy_narg, &args);
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#endif
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rval[0] = 0;
|
|
rval[1] = frame.tf_edx;
|
|
error = (*callp->sy_call)(p, args, rval);
|
|
switch (error) {
|
|
case 0:
|
|
/*
|
|
* Reinitialize proc pointer `p' as it may be different
|
|
* if this is a child returning from fork syscall.
|
|
*/
|
|
p = curproc;
|
|
frame.tf_eax = rval[0];
|
|
frame.tf_edx = rval[1];
|
|
frame.tf_eflags &= ~PSL_C; /* carry bit */
|
|
break;
|
|
|
|
case ERESTART:
|
|
/*
|
|
* Reconstruct pc, assuming lcall $X,y is 7 bytes, as it is
|
|
* always.
|
|
*/
|
|
frame.tf_eip = opc - 7;
|
|
break;
|
|
|
|
case EJUSTRETURN:
|
|
/* nothing to do */
|
|
break;
|
|
|
|
default:
|
|
bad:
|
|
frame.tf_eax = error;
|
|
frame.tf_eflags |= PSL_C; /* carry bit */
|
|
break;
|
|
}
|
|
|
|
#ifdef SYSCALL_DEBUG
|
|
scdebug_ret(p, code, error, rval[0]);
|
|
#endif
|
|
userret(p, frame.tf_eip, sticks);
|
|
#ifdef KTRACE
|
|
if (KTRPOINT(p, KTR_SYSRET))
|
|
ktrsysret(p->p_tracep, code, error, rval[0]);
|
|
#endif
|
|
#ifdef DIAGNOSTIC
|
|
{ extern int _udatasel, _ucodesel;
|
|
if (frame.tf_ss != _udatasel)
|
|
printf("ss %x call %d\n", frame.tf_ss, code);
|
|
if ((frame.tf_cs & 0xffff) != _ucodesel)
|
|
printf("cs %x call %d\n", frame.tf_cs, code);
|
|
if (frame.tf_eip >= VM_MAXUSER_ADDRESS) {
|
|
printf("eip %x call %d\n", frame.tf_eip, code);
|
|
frame.tf_eip = 0;
|
|
}
|
|
}
|
|
#endif
|
|
}
|