ab4bc4b293
Cosmetic. Return from trap() if trap_fatal() returns. trap_fatal() isn't fatal if you have ddb. Returning from trap() is usually the right thing to do and much better than falling through.
714 lines
17 KiB
C
714 lines
17 KiB
C
/*-
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* Copyright (C) 1994, David Greenman
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* Copyright (c) 1990, 1993
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* The Regents of the University of California. 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 1.40 1994/10/21 01:18:38 wollman 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/syscall.h>
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#include <sys/sysent.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 <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 <vm/vm_page.h>
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#include <machine/cpu.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 <machine/../isa/isa_device.h>
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#include "isa.h"
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#include "npx.h"
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int trap_pfault __P((struct trapframe *, int));
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void trap_fatal __P((struct trapframe *));
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#define MAX_TRAP_MSG 27
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char *trap_msg[] = {
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"reserved addressing fault", /* 0 T_RESADFLT */
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"privileged instruction fault", /* 1 T_PRIVINFLT */
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"reserved operand fault", /* 2 T_RESOPFLT */
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"breakpoint instruction fault", /* 3 T_BPTFLT */
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"", /* 4 unused */
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"system call trap", /* 5 T_SYSCALL */
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"arithmetic trap", /* 6 T_ARITHTRAP */
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"system forced exception", /* 7 T_ASTFLT */
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"segmentation (limit) fault", /* 8 T_SEGFLT */
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"general protection fault", /* 9 T_PROTFLT */
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"trace trap", /* 10 T_TRCTRAP */
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"", /* 11 unused */
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"page fault", /* 12 T_PAGEFLT */
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"page table fault", /* 13 T_TABLEFLT */
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"alignment fault", /* 14 T_ALIGNFLT */
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"kernel stack pointer not valid", /* 15 T_KSPNOTVAL */
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"bus error", /* 16 T_BUSERR */
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"kernel debugger fault", /* 17 T_KDBTRAP */
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"integer divide fault", /* 18 T_DIVIDE */
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"non-maskable interrupt trap", /* 19 T_NMI */
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"overflow trap", /* 20 T_OFLOW */
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"FPU bounds check fault", /* 21 T_BOUND */
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"FPU device not available", /* 22 T_DNA */
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"double fault", /* 23 T_DOUBLEFLT */
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"FPU operand fetch fault", /* 24 T_FPOPFLT */
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"invalid TSS fault", /* 25 T_TSSFLT */
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"segment not present fault", /* 26 T_SEGNPFLT */
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"stack fault", /* 27 T_STKFLT */
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};
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static inline void
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userret(p, frame, oticks)
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struct proc *p;
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struct trapframe *frame;
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u_quad_t oticks;
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{
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int sig, s;
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while ((sig = CURSIG(p)) != 0)
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postsig(sig);
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p->p_priority = p->p_usrpri;
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if (want_resched) {
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/*
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* Since we are curproc, clock will normally just change
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* our priority without moving us from one queue to another
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* (since the running process is not on a queue.)
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* If that happened after we setrunqueue ourselves but before we
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* mi_switch()'ed, we might not be on the queue indicated by
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* our priority.
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*/
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s = splclock();
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setrunqueue(p);
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p->p_stats->p_ru.ru_nivcsw++;
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mi_switch();
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splx(s);
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while ((sig = CURSIG(p)) != 0)
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postsig(sig);
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}
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if (p->p_stats->p_prof.pr_scale) {
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u_quad_t ticks = p->p_sticks - oticks;
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if (ticks) {
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#ifdef PROFTIMER
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extern int profscale;
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addupc(frame->tf_eip, &p->p_stats->p_prof,
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ticks * profscale);
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#else
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addupc(frame->tf_eip, &p->p_stats->p_prof, ticks);
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#endif
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}
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}
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curpriority = p->p_priority;
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}
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/*
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* trap(frame):
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* Exception, fault, and trap interface to the FreeBSD kernel.
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* This 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.
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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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struct proc *p = curproc;
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u_quad_t sticks = 0;
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int i = 0, ucode = 0, type, code;
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#ifdef DIAGNOSTIC
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u_long eva;
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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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code = frame.tf_err;
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if (ISPL(frame.tf_cs) == SEL_UPL) {
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/* user trap */
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sticks = p->p_sticks;
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p->p_md.md_regs = (int *)&frame;
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switch (type) {
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case T_RESADFLT: /* reserved addressing fault */
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case T_PRIVINFLT: /* privileged instruction fault */
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case T_RESOPFLT: /* reserved operand fault */
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ucode = type;
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i = SIGILL;
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break;
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case T_BPTFLT: /* bpt instruction fault */
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case T_TRCTRAP: /* trace trap */
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frame.tf_eflags &= ~PSL_T;
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i = SIGTRAP;
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break;
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case T_ARITHTRAP: /* arithmetic trap */
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ucode = code;
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i = SIGFPE;
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break;
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case T_ASTFLT: /* Allow process switch */
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astoff();
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cnt.v_soft++;
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if ((p->p_flag & P_OWEUPC) && 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 &= ~P_OWEUPC;
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}
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goto out;
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case T_PROTFLT: /* general protection fault */
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case T_SEGNPFLT: /* segment not present fault */
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case T_STKFLT: /* stack fault */
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ucode = code + BUS_SEGM_FAULT ;
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i = SIGBUS;
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break;
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case T_PAGEFLT: /* page fault */
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i = trap_pfault(&frame, TRUE);
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if (i == -1)
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return;
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if (i == 0)
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goto out;
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ucode = T_PAGEFLT;
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break;
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case T_DIVIDE: /* integer divide fault */
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ucode = FPE_INTDIV_TRAP;
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i = SIGFPE;
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break;
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#if NISA > 0
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case T_NMI:
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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(code) == 0) return;
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panic("NMI indicates hardware failure");
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#endif
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case T_OFLOW: /* integer overflow fault */
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ucode = FPE_INTOVF_TRAP;
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i = SIGFPE;
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break;
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case T_BOUND: /* bounds check fault */
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ucode = FPE_SUBRNG_TRAP;
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i = SIGFPE;
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break;
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case T_DNA:
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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 /* NNPX > 0 */
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#if defined(MATH_EMULATE) || defined(GPL_MATH_EMULATE)
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i = math_emulate(&frame);
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if (i == 0) return;
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#else /* MATH_EMULATE || GPL_MATH_EMULATE */
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panic("trap: math emulation necessary!");
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#endif /* MATH_EMULATE || GPL_MATH_EMULATE */
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ucode = FPE_FPU_NP_TRAP;
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break;
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case T_FPOPFLT: /* FPU operand fetch fault */
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ucode = T_FPOPFLT;
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i = SIGILL;
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break;
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default:
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trap_fatal(&frame);
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return;
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}
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} else {
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/* kernel trap */
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switch (type) {
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case T_PAGEFLT: /* page fault */
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(void) trap_pfault(&frame, FALSE);
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return;
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case T_PROTFLT: /* general protection fault */
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case T_SEGNPFLT: /* segment not present fault */
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if (curpcb && curpcb->pcb_onfault) {
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frame.tf_eip = (int)curpcb->pcb_onfault;
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return;
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}
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break;
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#ifdef DDB
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case T_BPTFLT:
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case T_TRCTRAP:
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if (kdb_trap (type, 0, &frame))
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return;
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break;
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#else
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case T_TRCTRAP: /* trace trap -- someone single stepping lcall's */
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/* Q: how do we turn it on again? */
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frame.tf_eflags &= ~PSL_T;
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return;
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#endif
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#if NISA > 0
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case T_NMI:
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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(code) == 0) return;
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/* FALL THROUGH */
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#endif
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}
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trap_fatal(&frame);
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return;
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}
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trapsignal(p, i, ucode);
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#ifdef DIAGNOSTIC
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eva = rcr2();
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if (type <= MAX_TRAP_MSG) {
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uprintf("fatal process exception: %s",
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trap_msg[type]);
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if ((type == T_PAGEFLT) || (type == T_PROTFLT))
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uprintf(", fault VA = 0x%x", eva);
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uprintf("\n");
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}
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#endif
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out:
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userret(p, &frame, sticks);
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}
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int
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trap_pfault(frame, usermode)
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struct trapframe *frame;
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int usermode;
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{
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vm_offset_t va;
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struct vmspace *vm = NULL;
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vm_map_t map = 0;
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int rv = 0;
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vm_prot_t ftype;
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extern vm_map_t kernel_map;
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int eva;
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struct proc *p = curproc;
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eva = rcr2();
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va = trunc_page((vm_offset_t)eva);
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if (va >= KERNBASE) {
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/*
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* Don't allow user-mode faults in kernel address space.
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*/
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if (usermode)
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goto nogo;
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map = kernel_map;
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} else {
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/*
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* This is a fault on non-kernel virtual memory.
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* vm is initialized above to NULL. If curproc is NULL
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* or curproc->p_vmspace is NULL the fault is fatal.
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*/
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if (p != NULL)
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vm = p->p_vmspace;
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if (vm == NULL)
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goto nogo;
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map = &vm->vm_map;
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}
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if (frame->tf_err & 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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if (map != kernel_map) {
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vm_offset_t v = (vm_offset_t) vtopte(va);
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vm_page_t ptepg;
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/*
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* Keep swapout from messing with us during this
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* critical time.
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*/
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++p->p_lock;
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/*
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* Grow the stack if necessary
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*/
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if ((caddr_t)va > vm->vm_maxsaddr
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&& (caddr_t)va < (caddr_t)USRSTACK) {
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if (!grow(p, va)) {
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rv = KERN_FAILURE;
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--p->p_lock;
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goto nogo;
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}
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}
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/*
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* Check if page table is mapped, if not,
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* fault it first
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*/
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/* Fault the pte only if needed: */
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*(volatile char *)v += 0;
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ptepg = (vm_page_t) pmap_pte_vm_page(vm_map_pmap(map), v);
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if( ptepg->hold_count == 0)
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ptepg->act_count += 3;
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vm_page_hold(ptepg);
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/* Fault in the user page: */
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rv = vm_fault(map, va, ftype, FALSE);
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vm_page_unhold(ptepg);
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/*
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* page table pages don't need to be kept if they
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* are not held
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*/
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if( ptepg->hold_count == 0 && ptepg->wire_count == 0) {
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pmap_page_protect( VM_PAGE_TO_PHYS(ptepg),
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VM_PROT_NONE);
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vm_page_free(ptepg);
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}
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--p->p_lock;
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} else {
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/*
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* Since we know that kernel virtual address addresses
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* always have pte pages mapped, we just have to fault
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* the page.
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*/
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rv = vm_fault(map, va, ftype, FALSE);
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}
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if (rv == KERN_SUCCESS)
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return (0);
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nogo:
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if (!usermode) {
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if (curpcb && curpcb->pcb_onfault) {
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frame->tf_eip = (int)curpcb->pcb_onfault;
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return (0);
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}
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trap_fatal(frame);
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return (-1);
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}
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/* kludge to pass faulting virtual address to sendsig */
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frame->tf_err = eva;
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return((rv == KERN_PROTECTION_FAILURE) ? SIGBUS : SIGSEGV);
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}
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void
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trap_fatal(frame)
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struct trapframe *frame;
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{
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int code, type, eva;
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struct soft_segment_descriptor softseg;
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code = frame->tf_err;
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type = frame->tf_trapno;
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eva = rcr2();
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sdtossd(&gdt[IDXSEL(frame->tf_cs & 0xffff)].sd, &softseg);
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if (type <= MAX_TRAP_MSG)
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printf("\n\nFatal trap %d: %s while in %s mode\n",
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type, trap_msg[type],
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ISPL(frame->tf_cs) == SEL_UPL ? "user" : "kernel");
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if (type == T_PAGEFLT) {
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printf("fault virtual address = 0x%x\n", eva);
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printf("fault code = %s %s, %s\n",
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code & PGEX_U ? "user" : "supervisor",
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code & PGEX_W ? "write" : "read",
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code & PGEX_P ? "protection violation" : "page not present");
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}
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printf("instruction pointer = 0x%x:0x%x\n", frame->tf_cs & 0xffff, frame->tf_eip);
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printf("code segment = base 0x%x, limit 0x%x, type 0x%x\n",
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softseg.ssd_base, softseg.ssd_limit, softseg.ssd_type);
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printf(" = DPL %d, pres %d, def32 %d, gran %d\n",
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softseg.ssd_dpl, softseg.ssd_p, softseg.ssd_def32, softseg.ssd_gran);
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printf("processor eflags = ");
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if (frame->tf_eflags & PSL_T)
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printf("trace/trap, ");
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if (frame->tf_eflags & PSL_I)
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printf("interrupt enabled, ");
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if (frame->tf_eflags & PSL_NT)
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printf("nested task, ");
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if (frame->tf_eflags & PSL_RF)
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printf("resume, ");
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if (frame->tf_eflags & PSL_VM)
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printf("vm86, ");
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printf("IOPL = %d\n", (frame->tf_eflags & PSL_IOPL) >> 12);
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printf("current process = ");
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if (curproc) {
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printf("%lu (%s)\n",
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(u_long)curproc->p_pid, curproc->p_comm ?
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curproc->p_comm : "");
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} else {
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printf("Idle\n");
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}
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printf("interrupt mask = ");
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|
if ((cpl & net_imask) == net_imask)
|
|
printf("net ");
|
|
if ((cpl & tty_imask) == tty_imask)
|
|
printf("tty ");
|
|
if ((cpl & bio_imask) == bio_imask)
|
|
printf("bio ");
|
|
if (cpl == 0)
|
|
printf("none");
|
|
printf("\n");
|
|
|
|
#ifdef KDB
|
|
if (kdb_trap(&psl))
|
|
return;
|
|
#endif
|
|
#ifdef DDB
|
|
if (kdb_trap (type, 0, frame))
|
|
return;
|
|
#endif
|
|
if (type <= MAX_TRAP_MSG)
|
|
panic(trap_msg[type]);
|
|
else
|
|
panic("unknown/reserved trap");
|
|
}
|
|
|
|
/*
|
|
* Compensate for 386 brain damage (missing URKR).
|
|
* This is a little simpler than the pagefault handler in trap() because
|
|
* it the page tables have already been faulted in and high addresses
|
|
* are thrown out early for other reasons.
|
|
*/
|
|
int trapwrite(addr)
|
|
unsigned addr;
|
|
{
|
|
struct proc *p;
|
|
vm_offset_t va, v;
|
|
struct vmspace *vm;
|
|
int rv;
|
|
|
|
va = trunc_page((vm_offset_t)addr);
|
|
/*
|
|
* XXX - MAX is END. Changed > to >= for temp. fix.
|
|
*/
|
|
if (va >= VM_MAXUSER_ADDRESS)
|
|
return (1);
|
|
|
|
p = curproc;
|
|
vm = p->p_vmspace;
|
|
|
|
++p->p_lock;
|
|
|
|
if ((caddr_t)va >= vm->vm_maxsaddr
|
|
&& (caddr_t)va < (caddr_t)USRSTACK) {
|
|
if (!grow(p, va)) {
|
|
--p->p_lock;
|
|
return (1);
|
|
}
|
|
}
|
|
|
|
v = trunc_page(vtopte(va));
|
|
|
|
/*
|
|
* wire the pte page
|
|
*/
|
|
if (va < USRSTACK) {
|
|
vm_map_pageable(&vm->vm_map, v, round_page(v+1), FALSE);
|
|
}
|
|
|
|
/*
|
|
* fault the data page
|
|
*/
|
|
rv = vm_fault(&vm->vm_map, va, VM_PROT_READ|VM_PROT_WRITE, FALSE);
|
|
|
|
/*
|
|
* unwire the pte page
|
|
*/
|
|
if (va < USRSTACK) {
|
|
vm_map_pageable(&vm->vm_map, v, round_page(v+1), TRUE);
|
|
}
|
|
|
|
--p->p_lock;
|
|
|
|
if (rv != KERN_SUCCESS)
|
|
return 1;
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* syscall(frame):
|
|
* System call request from POSIX system call gate interface to kernel.
|
|
* Like trap(), argument is call by reference.
|
|
*/
|
|
/*ARGSUSED*/
|
|
void
|
|
syscall(frame)
|
|
struct trapframe frame;
|
|
{
|
|
caddr_t params;
|
|
int i;
|
|
struct sysent *callp;
|
|
struct proc *p = curproc;
|
|
u_quad_t sticks;
|
|
int error, opc;
|
|
int args[8], rval[2];
|
|
u_int code;
|
|
|
|
sticks = p->p_sticks;
|
|
if (ISPL(frame.tf_cs) != SEL_UPL)
|
|
panic("syscall");
|
|
|
|
code = frame.tf_eax;
|
|
p->p_md.md_regs = (int *)&frame;
|
|
params = (caddr_t)frame.tf_esp + sizeof (int) ;
|
|
|
|
/*
|
|
* Reconstruct pc, assuming lcall $X,y is 7 bytes, as it is always.
|
|
*/
|
|
opc = frame.tf_eip - 7;
|
|
/*
|
|
* Need to check if this is a 32 bit or 64 bit syscall.
|
|
*/
|
|
if (code == SYS_syscall) {
|
|
/*
|
|
* Code is first argument, followed by actual args.
|
|
*/
|
|
code = fuword(params);
|
|
params += sizeof (int);
|
|
} else if (code == SYS___syscall) {
|
|
/*
|
|
* Like syscall, but code is a quad, so as to maintain
|
|
* quad alignment for the rest of the arguments.
|
|
*/
|
|
code = fuword(params + _QUAD_LOWWORD * sizeof(int));
|
|
params += sizeof(quad_t);
|
|
}
|
|
|
|
if (p->p_sysent->sv_mask)
|
|
code = code & p->p_sysent->sv_mask;
|
|
|
|
if (code >= p->p_sysent->sv_size)
|
|
callp = &p->p_sysent->sv_table[0];
|
|
else
|
|
callp = &p->p_sysent->sv_table[code];
|
|
|
|
if ((i = callp->sy_narg * sizeof (int)) &&
|
|
(error = copyin(params, (caddr_t)args, (u_int)i))) {
|
|
#ifdef KTRACE
|
|
if (KTRPOINT(p, KTR_SYSCALL))
|
|
ktrsyscall(p->p_tracep, code, callp->sy_narg, args);
|
|
#endif
|
|
goto bad;
|
|
}
|
|
#ifdef KTRACE
|
|
if (KTRPOINT(p, KTR_SYSCALL))
|
|
ktrsyscall(p->p_tracep, code, callp->sy_narg, args);
|
|
#endif
|
|
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:
|
|
frame.tf_eip = opc;
|
|
break;
|
|
|
|
case EJUSTRETURN:
|
|
break;
|
|
|
|
default:
|
|
bad:
|
|
if (p->p_sysent->sv_errsize)
|
|
if (error >= p->p_sysent->sv_errsize)
|
|
error = -1; /* XXX */
|
|
else
|
|
error = p->p_sysent->sv_errtbl[error];
|
|
frame.tf_eax = error;
|
|
frame.tf_eflags |= PSL_C; /* carry bit */
|
|
break;
|
|
}
|
|
|
|
userret(p, &frame, sticks);
|
|
|
|
#ifdef KTRACE
|
|
if (KTRPOINT(p, KTR_SYSRET))
|
|
ktrsysret(p->p_tracep, code, error, rval[0]);
|
|
#endif
|
|
}
|