OpenBSD-4.6/lib/libkvm/kvm_m68k.c
/* $OpenBSD: kvm_m68k.c,v 1.18 2009/06/20 20:20:43 millert Exp $ */
/* $NetBSD: kvm_m68k.c,v 1.9 1996/05/07 06:09:11 leo Exp $ */
/*-
* Copyright (c) 1989, 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software developed by the Computer Systems
* Engineering group at Lawrence Berkeley Laboratory under DARPA contract
* BG 91-66 and contributed to Berkeley.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#if defined(LIBC_SCCS) && !defined(lint)
#if 0
static char sccsid[] = "@(#)kvm_hp300.c 8.1 (Berkeley) 6/4/93";
#else
static char *rcsid = "$OpenBSD: kvm_m68k.c,v 1.18 2009/06/20 20:20:43 millert Exp $";
#endif
#endif /* LIBC_SCCS and not lint */
/*
* m68k machine dependent routines for kvm. Hopefully, the forthcoming
* vm code will one day obsolete this module.
*/
#include <sys/param.h>
#include <sys/user.h>
#include <sys/proc.h>
#include <sys/stat.h>
#include <sys/core.h>
#include <sys/exec_aout.h>
#include <sys/kcore.h>
#include <unistd.h>
#include <stdlib.h>
#include <limits.h>
#include <nlist.h>
#include <kvm.h>
#include <uvm/uvm_extern.h>
#include <machine/vmparam.h>
#include <machine/pmap.h>
#include <db.h>
#include "kvm_private.h"
#include <machine/cpu.h>
#include <machine/pte.h>
#include <machine/kcore.h>
#ifndef btop
#define btop(x) (((unsigned)(x)) >> PGSHIFT) /* XXX */
#define ptob(x) ((caddr_t)((x) << PGSHIFT)) /* XXX */
#endif
void
_kvm_freevtop(kvm_t *kd)
{
if (kd->vmst != NULL) {
free(kd->vmst);
kd->vmst = NULL;
}
}
int
_kvm_initvtop(kvm_t *kd)
{
return (0);
}
static int
_kvm_vatop(kvm_t *kd, st_entry_t *sta, u_long va, u_long *pa)
{
cpu_kcore_hdr_t *cpu_kh;
int p, ste, pte, offset;
u_long addr;
if (ISALIVE(kd)) {
_kvm_err(kd, 0, "vatop called in live kernel!");
return (0);
}
offset = va & PGOFSET;
cpu_kh = kd->cpu_data;
/*
* If we are initializing (kernel segment table pointer not yet set)
* then return pa == va to avoid infinite recursion.
*/
if (cpu_kh->sysseg_pa == 0) {
*pa = va + cpu_kh->kernel_pa;
return (NBPG - offset);
}
if (cpu_kh->mmutype == MMU_68040 || cpu_kh->mmutype == MMU_68060) {
st_entry_t *sta2;
addr = (u_long)&sta[va >> SG4_SHIFT1];
/*
* Can't use KREAD to read kernel segment table entries.
* Fortunately it is 1-to-1 mapped so we don't have to.
*/
if (sta == cpu_kh->sysseg_pa) {
if (_kvm_pread(kd, kd->pmfd, (char *)&ste, sizeof(ste),
(off_t)_kvm_pa2off(kd, addr)) < 0)
goto invalid;
} else if (KREAD(kd, addr, &ste))
goto invalid;
if ((ste & SG_V) == 0) {
_kvm_err(kd, 0, "invalid level 1 descriptor (%x)",
ste);
return (0);
}
sta2 = (st_entry_t *)(ste & SG4_ADDR1);
addr = (u_long)&sta2[(va & SG4_MASK2) >> SG4_SHIFT2];
/*
* Address from level 1 STE is a physical address,
* so don't use kvm_read.
*/
if (_kvm_pread(kd, kd->pmfd, (char *)&ste, sizeof(ste),
(off_t)_kvm_pa2off(kd, addr)) < 0)
goto invalid;
if ((ste & SG_V) == 0) {
_kvm_err(kd, 0, "invalid level 2 descriptor (%x)",
ste);
return (0);
}
sta2 = (st_entry_t *)(ste & SG4_ADDR2);
addr = (u_long)&sta2[(va & SG4_MASK3) >> SG4_SHIFT3];
} else {
addr = (u_long)&sta[va >> SEGSHIFT020];
/*
* Can't use KREAD to read kernel segment table entries.
* Fortunately it is 1-to-1 mapped so we don't have to.
*/
if (sta == cpu_kh->sysseg_pa) {
if (_kvm_pread(kd, kd->pmfd, (char *)&ste,
sizeof(ste), (off_t)_kvm_pa2off(kd, addr)) < 0)
goto invalid;
} else if (KREAD(kd, addr, &ste))
goto invalid;
if ((ste & SG_V) == 0) {
_kvm_err(kd, 0, "invalid segment (%x)", ste);
return (0);
}
p = btop(va & SG_PMASK);
addr = (ste & SG_FRAME) + (p * sizeof(pt_entry_t));
}
/*
* Address from STE is a physical address so don't use kvm_read.
*/
if (_kvm_pread(kd, kd->pmfd, (char *)&pte, sizeof(pte),
(off_t)_kvm_pa2off(kd, addr)) < 0)
goto invalid;
addr = pte & PG_FRAME;
if (pte == PG_NV) {
_kvm_err(kd, 0, "page not valid");
return (0);
}
*pa = addr + offset;
return (NBPG - offset);
invalid:
_kvm_err(kd, 0, "invalid address (%lx)", va);
return (0);
}
int
_kvm_kvatop(kvm_t *kd, u_long va, paddr_t *pa)
{
cpu_kcore_hdr_t *cpu_kh;
cpu_kh = kd->cpu_data;
return (_kvm_vatop(kd, cpu_kh->sysseg_pa, va, pa));
}
/*
* Translate a physical address to a file-offset in the crash-dump.
*/
off_t
_kvm_pa2off(kvm_t *kd, paddr_t pa)
{
cpu_kcore_hdr_t *cpu_kh;
phys_ram_seg_t *rsp;
off_t off;
cpu_kh = kd->cpu_data;
off = 0;
for (rsp = cpu_kh->ram_segs; rsp->size; rsp++) {
if (pa >= rsp->start && pa < rsp->start + rsp->size) {
pa -= rsp->start;
break;
}
off += rsp->size;
}
return (kd->dump_off + off + pa);
}