608 lines
13 KiB
C
608 lines
13 KiB
C
/*
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* Copyright (C) 1995, 1996 Wolfgang Solfrank.
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* Copyright (C) 1995, 1996 TooLs GmbH.
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* All rights reserved.
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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 TooLs GmbH.
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* 4. The name of TooLs GmbH may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $NetBSD: trap.c,v 1.26 2000/05/27 00:40:40 sommerfeld Exp $
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*/
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#ifndef lint
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static const char rcsid[] =
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"$FreeBSD$";
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#endif /* not lint */
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#include "opt_ddb.h"
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#include "opt_ktrace.h"
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#include <sys/param.h>
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#include <sys/proc.h>
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#include <sys/reboot.h>
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#include <sys/syscall.h>
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#include <sys/systm.h>
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#include <sys/uio.h>
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#include <sys/user.h>
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#include <sys/ktrace.h>
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#include <vm/vm.h>
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#include <vm/vm_kern.h>
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#include <vm/pmap.h>
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#include <machine/cpu.h>
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#include <machine/frame.h>
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#include <machine/pcb.h>
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#include <machine/psl.h>
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#include <machine/trap.h>
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/* These definitions should probably be somewhere else XXX */
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#define FIRSTARG 3 /* first argument is in reg 3 */
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#define NARGREG 8 /* 8 args are in registers */
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#define MOREARGS(sp) ((caddr_t)((int)(sp) + 8)) /* more args go here */
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volatile int astpending;
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volatile int want_resched;
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#if 0 /* XXX: not used yet */
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static int fix_unaligned __P((struct proc *p, struct trapframe *frame));
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#endif
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void
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trap(struct trapframe *frame)
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{
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#if 0 /* XXX: This code hasn't been reworked yet. */
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struct proc *p;
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int type;
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u_quad_t sticks;
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p = curproc;
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type = frame->exc;
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if (frame->srr1 & PSL_PR) {
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type |= EXC_USER;
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sticks = p->p_sticks;
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}
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switch (type) {
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case EXC_TRC|EXC_USER:
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frame->srr1 &= ~PSL_SE;
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trapsignal(p, SIGTRAP, EXC_TRC);
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break;
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case EXC_DSI:
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{
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vm_map_t map;
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vaddr_t va;
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int ftype;
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faultbuf *fb;
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map = kernel_map;
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va = frame->dar;
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if ((va >> ADDR_SR_SHFT) == USER_SR) {
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sr_t user_sr;
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__asm ("mfsr %0, %1"
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: "=r"(user_sr) : "K"(USER_SR));
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va &= ADDR_PIDX | ADDR_POFF;
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va |= user_sr << ADDR_SR_SHFT;
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map = &p->p_vmspace->vm_map;
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}
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if (frame->dsisr & DSISR_STORE)
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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 (uvm_fault(map, trunc_page(va), 0, ftype)
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== KERN_SUCCESS)
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return;
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if (fb = p->p_addr->u_pcb.pcb_onfault) {
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frame->srr0 = (*fb)[0];
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frame->fixreg[1] = (*fb)[1];
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frame->fixreg[2] = (*fb)[2];
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frame->cr = (*fb)[3];
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bcopy(&(*fb)[4], &frame->fixreg[13],
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19 * sizeof(register_t));
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return;
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}
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map = kernel_map;
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}
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goto brain_damage;
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case EXC_DSI|EXC_USER:
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{
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int ftype, rv;
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if (frame->dsisr & DSISR_STORE)
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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 ((rv = uvm_fault(&p->p_vmspace->vm_map,
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trunc_page(frame->dar), 0, ftype))
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== KERN_SUCCESS)
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break;
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if (rv == KERN_RESOURCE_SHORTAGE) {
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printf("UVM: pid %d (%s), uid %d killed: "
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"out of swap\n",
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p->p_pid, p->p_comm,
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p->p_cred && p->p_ucred ?
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p->p_ucred->cr_uid : -1);
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trapsignal(p, SIGKILL, EXC_DSI);
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} else {
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trapsignal(p, SIGSEGV, EXC_DSI);
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}
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}
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break;
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case EXC_ISI|EXC_USER:
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{
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int ftype;
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ftype = VM_PROT_READ | VM_PROT_EXECUTE;
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if (uvm_fault(&p->p_vmspace->vm_map,
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trunc_page(frame->srr0), 0, ftype)
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== KERN_SUCCESS)
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break;
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}
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trapsignal(p, SIGSEGV, EXC_ISI);
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break;
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case EXC_SC|EXC_USER:
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{
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struct sysent *callp;
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size_t argsize;
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register_t code, error;
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register_t *params, rval[2];
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int nsys, n;
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register_t args[10];
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uvmexp.syscalls++;
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nsys = p->p_emul->e_nsysent;
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callp = p->p_emul->e_sysent;
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code = frame->fixreg[0];
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params = frame->fixreg + FIRSTARG;
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switch (code) {
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case SYS_syscall:
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/*
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* code is first argument,
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* followed by actual args.
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*/
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code = *params++;
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break;
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case SYS___syscall:
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/*
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* Like syscall, but code is a quad,
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* so as to maintain quad alignment
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* for the rest of the args.
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*/
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if (callp != sysent)
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break;
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params++;
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code = *params++;
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break;
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default:
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break;
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}
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if (code < 0 || code >= nsys)
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callp += p->p_emul->e_nosys;
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else
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callp += code;
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argsize = callp->sy_argsize;
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n = NARGREG - (params - (frame->fixreg + FIRSTARG));
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if (argsize > n * sizeof(register_t)) {
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bcopy(params, args, n * sizeof(register_t));
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if (error = copyin(MOREARGS(frame->fixreg[1]),
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args + n,
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argsize - n * sizeof(register_t))) {
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#ifdef KTRACE
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/* Can't get all the arguments! */
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if (KTRPOINT(p, KTR_SYSCALL))
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ktrsyscall(p, code, argsize,
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args);
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#endif
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goto syscall_bad;
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}
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params = args;
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}
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#ifdef KTRACE
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if (KTRPOINT(p, KTR_SYSCALL))
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ktrsyscall(p, code, argsize, params);
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#endif
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rval[0] = 0;
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rval[1] = frame->fixreg[FIRSTARG + 1];
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switch (error = (*callp->sy_call)(p, params, rval)) {
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case 0:
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frame->fixreg[FIRSTARG] = rval[0];
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frame->fixreg[FIRSTARG + 1] = rval[1];
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frame->cr &= ~0x10000000;
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break;
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case ERESTART:
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/*
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* Set user's pc back to redo the system call.
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*/
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frame->srr0 -= 4;
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break;
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case EJUSTRETURN:
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/* nothing to do */
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break;
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default:
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syscall_bad:
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if (p->p_emul->e_errno)
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error = p->p_emul->e_errno[error];
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frame->fixreg[FIRSTARG] = error;
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frame->cr |= 0x10000000;
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break;
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}
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#ifdef KTRACE
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if (KTRPOINT(p, KTR_SYSRET))
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ktrsysret(p, code, error, rval[0]);
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#endif
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}
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break;
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case EXC_FPU|EXC_USER:
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if (fpuproc)
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save_fpu(fpuproc);
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fpuproc = p;
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enable_fpu(p);
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break;
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case EXC_AST|EXC_USER:
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/* This is just here that we trap */
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break;
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case EXC_ALI|EXC_USER:
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if (fix_unaligned(p, frame) != 0)
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trapsignal(p, SIGBUS, EXC_ALI);
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else
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frame->srr0 += 4;
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break;
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case EXC_PGM|EXC_USER:
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/* XXX temporarily */
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if (frame->srr1 & 0x0002000)
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trapsignal(p, SIGTRAP, EXC_PGM);
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else
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trapsignal(p, SIGILL, EXC_PGM);
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break;
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case EXC_MCHK:
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{
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faultbuf *fb;
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if (fb = p->p_addr->u_pcb.pcb_onfault) {
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frame->srr0 = (*fb)[0];
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frame->fixreg[1] = (*fb)[1];
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frame->fixreg[2] = (*fb)[2];
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frame->cr = (*fb)[3];
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bcopy(&(*fb)[4], &frame->fixreg[13],
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19 * sizeof(register_t));
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return;
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}
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}
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goto brain_damage;
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default:
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brain_damage:
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printf("trap type %x at %x\n", type, frame->srr0);
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#ifdef DDB
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Debugger(); /* XXX temporarily */
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#endif
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#ifdef TRAP_PANICWAIT
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printf("Press a key to panic.\n");
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cngetc();
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#endif
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panic("trap");
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}
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astpending = 0; /* we are about to do it */
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uvmexp.softs++;
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if (p->p_flag & P_OWEUPC) {
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p->p_flag &= ~P_OWEUPC;
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ADDUPROF(p);
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}
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/* take pending signals */
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{
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int sig;
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while (sig = CURSIG(p))
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postsig(sig);
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}
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p->p_priority = p->p_usrpri;
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if (want_resched) {
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int sig;
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/*
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* We are being preempted.
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*/
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preempt(NULL);
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while (sig = CURSIG(p))
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postsig(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_flag & P_PROFIL) {
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extern int psratio;
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addupc_task(p, frame->srr0,
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(int)(p->p_sticks - sticks) * psratio);
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}
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/*
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* If someone stole the fpu while we were away, disable it
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*/
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if (p != fpuproc)
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frame->srr1 &= ~PSL_FP;
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curcpu()->ci_schedstate.spc_curpriority = p->p_priority;
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#endif
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}
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#if 0 /* XXX: child_return not used */
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void
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child_return(void *arg)
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{
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struct proc *p;
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struct trapframe *tf;
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p = arg;
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tf = trapframe(p);
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tf->fixreg[FIRSTARG] = 0;
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tf->fixreg[FIRSTARG + 1] = 1;
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tf->cr &= ~0x10000000;
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tf->srr1 &= ~PSL_FP; /* Disable FPU, as we can't be fpuproc */
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#ifdef KTRACE
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if (KTRPOINT(p, KTR_SYSRET))
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ktrsysret(p, SYS_fork, 0, 0);
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#endif
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/* Profiling? XXX */
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curcpu()->ci_schedstate.spc_curpriority = p->p_priority;
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}
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#endif
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static __inline void
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setusr(int content)
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{
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__asm __volatile ("isync; mtsr %0,%1; isync"
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:: "n"(USER_SR), "r"(content));
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}
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int
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copyin(udaddr, kaddr, len)
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const void *udaddr;
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void *kaddr;
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size_t len;
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{
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const char *up;
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char *kp;
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char *p;
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size_t l;
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faultbuf env;
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up = udaddr;
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kp = kaddr;
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#if 0
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if (setfault(env)) {
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curpcb->pcb_onfault = 0;
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return EFAULT;
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}
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#endif
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while (len > 0) {
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p = (char *)USER_ADDR + ((u_int)up & ~SEGMENT_MASK);
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l = ((char *)USER_ADDR + SEGMENT_LENGTH) - p;
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if (l > len)
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l = len;
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setusr(curpcb->pcb_pm->pm_sr[(u_int)up >> ADDR_SR_SHFT]);
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bcopy(p, kp, l);
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up += l;
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kp += l;
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len -= l;
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}
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curpcb->pcb_onfault = 0;
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return 0;
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}
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int
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copyout(kaddr, udaddr, len)
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const void *kaddr;
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void *udaddr;
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size_t len;
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{
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const char *kp;
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char *up;
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char *p;
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size_t l;
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faultbuf env;
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kp = kaddr;
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up = udaddr;
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#if 0
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if (setfault(env)) {
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curpcb->pcb_onfault = 0;
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return EFAULT;
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}
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#endif
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while (len > 0) {
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p = (char *)USER_ADDR + ((u_int)up & ~SEGMENT_MASK);
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l = ((char *)USER_ADDR + SEGMENT_LENGTH) - p;
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if (l > len)
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l = len;
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setusr(curpcb->pcb_pm->pm_sr[(u_int)up >> ADDR_SR_SHFT]);
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bcopy(kp, p, l);
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up += l;
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kp += l;
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len -= l;
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}
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curpcb->pcb_onfault = 0;
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return 0;
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}
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#if 0 /* XXX: not used yet */
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/*
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* kcopy(const void *src, void *dst, size_t len);
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*
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* Copy len bytes from src to dst, aborting if we encounter a fatal
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* page fault.
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*
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* kcopy() _must_ save and restore the old fault handler since it is
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* called by uiomove(), which may be in the path of servicing a non-fatal
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* page fault.
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*/
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int
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kcopy(const void *src, void *dst, size_t len)
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{
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faultbuf env, *oldfault;
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oldfault = curpcb->pcb_onfault;
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if (setfault(env)) {
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curpcb->pcb_onfault = oldfault;
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return EFAULT;
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}
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bcopy(src, dst, len);
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curpcb->pcb_onfault = oldfault;
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return 0;
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}
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int
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badaddr(void *addr, size_t size)
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{
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return badaddr_read(addr, size, NULL);
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}
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int
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badaddr_read(void *addr, size_t size, int *rptr)
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{
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faultbuf env;
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int x;
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/* Get rid of any stale machine checks that have been waiting. */
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__asm __volatile ("sync; isync");
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if (setfault(env)) {
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curpcb->pcb_onfault = 0;
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__asm __volatile ("sync");
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return 1;
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}
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__asm __volatile ("sync");
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switch (size) {
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case 1:
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x = *(volatile int8_t *)addr;
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break;
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case 2:
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x = *(volatile int16_t *)addr;
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break;
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case 4:
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x = *(volatile int32_t *)addr;
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break;
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default:
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panic("badaddr: invalid size (%d)", size);
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}
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/* Make sure we took the machine check, if we caused one. */
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__asm __volatile ("sync; isync");
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curpcb->pcb_onfault = 0;
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__asm __volatile ("sync"); /* To be sure. */
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/* Use the value to avoid reorder. */
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if (rptr)
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*rptr = x;
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return 0;
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}
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#endif
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/*
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* For now, this only deals with the particular unaligned access case
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* that gcc tends to generate. Eventually it should handle all of the
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* possibilities that can happen on a 32-bit PowerPC in big-endian mode.
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*/
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#if 0 /* XXX: Not used yet */
|
|
static int
|
|
fix_unaligned(p, frame)
|
|
struct proc *p;
|
|
struct trapframe *frame;
|
|
{
|
|
int indicator;
|
|
|
|
indicator = EXC_ALI_OPCODE_INDICATOR(frame->dsisr);
|
|
|
|
switch (indicator) {
|
|
case EXC_ALI_LFD:
|
|
case EXC_ALI_STFD:
|
|
{
|
|
int reg = EXC_ALI_RST(frame->dsisr);
|
|
double *fpr = &p->p_addr->u_pcb.pcb_fpu.fpr[reg];
|
|
|
|
/* Juggle the FPU to ensure that we've initialized
|
|
* the FPRs, and that their current state is in
|
|
* the PCB.
|
|
*/
|
|
if (fpuproc != p) {
|
|
if (fpuproc)
|
|
save_fpu(fpuproc);
|
|
enable_fpu(p);
|
|
}
|
|
save_fpu(p);
|
|
|
|
if (indicator == EXC_ALI_LFD) {
|
|
if (copyin((void *)frame->dar, fpr,
|
|
sizeof(double)) != 0)
|
|
return -1;
|
|
enable_fpu(p);
|
|
} else {
|
|
if (copyout(fpr, (void *)frame->dar,
|
|
sizeof(double)) != 0)
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
break;
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
#endif
|
|
|
|
void
|
|
userret(struct proc *p, struct trapframe *frame, u_quad_t oticks)
|
|
{
|
|
|
|
/* XXX: Coming soon */
|
|
return;
|
|
}
|