238 lines
5.9 KiB
C
238 lines
5.9 KiB
C
/* $NetBSD: kvm_i386.c,v 1.29 2010/10/05 23:48:16 jym 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.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
#if defined(LIBC_SCCS) && !defined(lint)
|
|
#if 0
|
|
static char sccsid[] = "@(#)kvm_hp300.c 8.1 (Berkeley) 6/4/93";
|
|
#else
|
|
__RCSID("$NetBSD: kvm_i386.c,v 1.29 2010/10/05 23:48:16 jym Exp $");
|
|
#endif
|
|
#endif /* LIBC_SCCS and not lint */
|
|
|
|
/*
|
|
* i386 machine dependent routines for kvm.
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/user.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/kcore.h>
|
|
#include <sys/types.h>
|
|
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
#include <nlist.h>
|
|
#include <kvm.h>
|
|
|
|
#include <uvm/uvm_extern.h>
|
|
|
|
#include <limits.h>
|
|
#include <db.h>
|
|
|
|
#include "kvm_private.h"
|
|
|
|
#include <i386/kcore.h>
|
|
#include <i386/pmap.h>
|
|
#include <i386/pte.h>
|
|
#include <i386/vmparam.h>
|
|
|
|
#ifndef btop
|
|
#define btop(x) (((unsigned)(x)) >> PGSHIFT) /* XXX */
|
|
#define ptob(x) ((caddr_t)((x) << PGSHIFT)) /* XXX */
|
|
#endif
|
|
|
|
/*
|
|
* Indicates whether PAE is in use for the kernel image
|
|
* 0: native i386 memory mappings
|
|
* 1: i386 PAE mappings
|
|
*/
|
|
static int i386_use_pae;
|
|
|
|
int _kvm_kvatop_i386(kvm_t *, vaddr_t, paddr_t *);
|
|
int _kvm_kvatop_i386pae(kvm_t *, vaddr_t, paddr_t *);
|
|
|
|
void
|
|
_kvm_freevtop(kvm_t *kd)
|
|
{
|
|
|
|
/* Not actually used for anything right now, but safe. */
|
|
if (kd->vmst != 0)
|
|
free(kd->vmst);
|
|
}
|
|
|
|
/*ARGSUSED*/
|
|
int
|
|
_kvm_initvtop(kvm_t *kd)
|
|
{
|
|
cpu_kcore_hdr_t *cpu_kh = kd->cpu_data;
|
|
|
|
i386_use_pae = 0; /* default: non PAE mode */
|
|
if ((cpu_kh->pdppaddr & I386_KCORE_PAE) == I386_KCORE_PAE)
|
|
i386_use_pae = 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Translate a kernel virtual address to a physical address.
|
|
*/
|
|
int
|
|
_kvm_kvatop(kvm_t *kd, vaddr_t va, paddr_t *pa)
|
|
{
|
|
|
|
if (ISALIVE(kd)) {
|
|
_kvm_err(kd, 0, "vatop called in live kernel!");
|
|
return 0;
|
|
}
|
|
|
|
switch (i386_use_pae) {
|
|
default:
|
|
case 0:
|
|
return _kvm_kvatop_i386(kd, va, pa);
|
|
case 1:
|
|
return _kvm_kvatop_i386pae(kd, va, pa);
|
|
}
|
|
|
|
}
|
|
|
|
/*
|
|
* Used to translate a virtual address to a physical address for systems
|
|
* with PAE mode disabled. Only two levels of virtual memory pages are
|
|
* dereferenced (L2 PDEs, then L1 PTEs).
|
|
*/
|
|
int
|
|
_kvm_kvatop_i386(kvm_t *kd, vaddr_t va, paddr_t *pa)
|
|
{
|
|
cpu_kcore_hdr_t *cpu_kh;
|
|
u_long page_off;
|
|
pd_entry_t pde;
|
|
pt_entry_t pte;
|
|
paddr_t pde_pa, pte_pa;
|
|
|
|
cpu_kh = kd->cpu_data;
|
|
page_off = va & PGOFSET;
|
|
|
|
/*
|
|
* Find and read the page directory entry.
|
|
* pdppaddr being PAGE_SIZE aligned, we mask the option bits.
|
|
*/
|
|
pde_pa = (cpu_kh->pdppaddr & PG_FRAME) + (pl2_pi(va) * sizeof(pde));
|
|
if (_kvm_pread(kd, kd->pmfd, (void *)&pde, sizeof(pde),
|
|
_kvm_pa2off(kd, pde_pa)) != sizeof(pde)) {
|
|
_kvm_syserr(kd, 0, "could not read PDE");
|
|
goto lose;
|
|
}
|
|
|
|
/*
|
|
* Find and read the page table entry.
|
|
*/
|
|
if ((pde & PG_V) == 0) {
|
|
_kvm_err(kd, 0, "invalid translation (invalid PDE)");
|
|
goto lose;
|
|
}
|
|
if ((pde & PG_PS) != 0) {
|
|
/*
|
|
* This is a 4MB page.
|
|
*/
|
|
page_off = va & ~PG_LGFRAME;
|
|
*pa = (pde & PG_LGFRAME) + page_off;
|
|
return (int)(NBPD_L2 - page_off);
|
|
}
|
|
pte_pa = (pde & PG_FRAME) + (pl1_pi(va) * sizeof(pt_entry_t));
|
|
if (_kvm_pread(kd, kd->pmfd, (void *) &pte, sizeof(pte),
|
|
_kvm_pa2off(kd, pte_pa)) != sizeof(pte)) {
|
|
_kvm_syserr(kd, 0, "could not read PTE");
|
|
goto lose;
|
|
}
|
|
|
|
/*
|
|
* Validate the PTE and return the physical address.
|
|
*/
|
|
if ((pte & PG_V) == 0) {
|
|
_kvm_err(kd, 0, "invalid translation (invalid PTE)");
|
|
goto lose;
|
|
}
|
|
*pa = (pte & PG_FRAME) + page_off;
|
|
return (int)(NBPG - page_off);
|
|
|
|
lose:
|
|
*pa = (paddr_t)~0L;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* 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 *ramsegs;
|
|
off_t off;
|
|
int i;
|
|
|
|
cpu_kh = kd->cpu_data;
|
|
ramsegs = (void *)((char *)(void *)cpu_kh + ALIGN(sizeof *cpu_kh));
|
|
|
|
off = 0;
|
|
for (i = 0; i < cpu_kh->nmemsegs; i++) {
|
|
if (pa >= ramsegs[i].start &&
|
|
(pa - ramsegs[i].start) < ramsegs[i].size) {
|
|
off += (pa - ramsegs[i].start);
|
|
break;
|
|
}
|
|
off += ramsegs[i].size;
|
|
}
|
|
|
|
return (kd->dump_off + off);
|
|
}
|
|
|
|
/*
|
|
* Machine-dependent initialization for ALL open kvm descriptors,
|
|
* not just those for a kernel crash dump. Some architectures
|
|
* have to deal with these NOT being constants! (i.e. m68k)
|
|
*/
|
|
int
|
|
_kvm_mdopen(kvm_t *kd)
|
|
{
|
|
|
|
kd->usrstack = USRSTACK;
|
|
kd->min_uva = VM_MIN_ADDRESS;
|
|
kd->max_uva = VM_MAXUSER_ADDRESS;
|
|
|
|
return 0;
|
|
}
|