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/* $OpenBSD: kvm_i386.c,v 1.28 2021/12/01 16:53:28 deraadt Exp $ */
/* $NetBSD: kvm_i386.c,v 1.9 1996/03/18 22:33:38 thorpej 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.
*/
/*
* i386 machine dependent routines for kvm. Hopefully, the forthcoming
* vm code will one day obsolete this module.
*/
#include <sys/types.h>
#include <sys/signal.h>
#include <sys/proc.h>
#include <sys/stat.h>
#include <stdlib.h>
#include <unistd.h>
#include <nlist.h>
#include <kvm.h>
#include <uvm/uvm_extern.h>
#include <machine/param.h>
#include <machine/vmparam.h>
#include <machine/pmap.h>
#include <limits.h>
#include <db.h>
#include "kvm_private.h"
#include <machine/pte.h>
/*
* We access both normal and PAE entries in 32bit chunks.
* Use a local name to avoid conflicting with the kernel's maybe-public,
* maybe-not p[td]_entry_t typedefs.
*/
typedef u_long ptd_entry_t;
/*
* These must match the values in pmap.c/pmapae.c
* First the non-PAE versions
*/
#define PD_MASK 0xffc00000 /* page directory address bits */
#define PT_MASK 0x003ff000 /* page table address bits */
/*
* PAE versions
*
* paddr_t is still 32bits, so the top 32bits of PDEs and PTEs only
* matters for the NX bit...which libkvm doesn't care about
*/
#define PAE_PDSHIFT 21
#define PAE_PD_MASK 0xffe00000 /* page directory address bits */
#define PAE_PT_MASK 0x001ff000 /* page table address bits */
#define PG_FRAME 0xfffff000
static int cpu_pae;
struct vmstate {
ptd_entry_t *PTD;
ptd_entry_t PD_mask;
ptd_entry_t PT_mask;
int PD_shift;
int PG_shift;
};
#define pdei(vm,VA) (((VA) & (vm)->PD_mask) >> (vm)->PD_shift)
#define ptei(vm,VA) (((VA) & (vm)->PT_mask) >> PAGE_SHIFT)
void
_kvm_freevtop(kvm_t *kd)
{
if (kd->vmst != NULL) {
free(kd->vmst->PTD);
free(kd->vmst);
kd->vmst = NULL;
}
}
int
_kvm_initvtop(kvm_t *kd)
{
struct nlist nl[4];
struct vmstate *vm;
u_long pa, PTDsize;
vm = _kvm_malloc(kd, sizeof(*vm));
if (vm == NULL)
return (-1);
kd->vmst = vm;
vm->PTD = NULL;
nl[0].n_name = "_PTDpaddr";
nl[1].n_name = "_PTDsize";
nl[2].n_name = "_cpu_pae";
nl[3].n_name = NULL;
if (kvm_nlist(kd, nl) != 0) {
_kvm_err(kd, kd->program, "bad namelist");
return (-1);
}
if (_kvm_pread(kd, kd->pmfd, &cpu_pae, sizeof cpu_pae,
_kvm_pa2off(kd, nl[2].n_value - KERNBASE)) != sizeof cpu_pae)
goto invalid;
if (_kvm_pread(kd, kd->pmfd, &PTDsize, sizeof PTDsize,
_kvm_pa2off(kd, nl[1].n_value - KERNBASE)) != sizeof PTDsize)
goto invalid;
if (_kvm_pread(kd, kd->pmfd, &pa, sizeof pa,
_kvm_pa2off(kd, nl[0].n_value - KERNBASE)) != sizeof pa)
goto invalid;
vm->PTD = _kvm_malloc(kd, PTDsize);
if (_kvm_pread(kd, kd->pmfd, vm->PTD, PTDsize,
_kvm_pa2off(kd, pa)) != PTDsize)
goto invalid;
if (cpu_pae) {
vm->PD_mask = PAE_PD_MASK;
vm->PT_mask = PAE_PT_MASK;
/* -1 here because entries are twice as large */
vm->PD_shift = PAE_PDSHIFT - 1;
vm->PG_shift = PAGE_SHIFT - 1;
} else {
vm->PD_mask = PD_MASK;
vm->PT_mask = PT_MASK;
vm->PD_shift = PDSHIFT;
vm->PG_shift = PAGE_SHIFT;
}
return (0);
invalid:
free(vm->PTD);
vm->PTD = NULL;
return (-1);
}
/*
* Translate a kernel virtual address to a physical address.
*/
int
_kvm_kvatop(kvm_t *kd, u_long va, paddr_t *pa)
{
u_long offset, pte_pa;
struct vmstate *vm;
ptd_entry_t pte;
if (!kd->vmst) {
_kvm_err(kd, 0, "vatop called before initvtop");
return (0);
}
if (ISALIVE(kd)) {
_kvm_err(kd, 0, "vatop called in live kernel!");
return (0);
}
vm = kd->vmst;
offset = va & (kd->nbpg - 1);
/*
* If we are initializing (kernel page table descriptor pointer
* not yet set) * then return pa == va to avoid infinite recursion.
*/
if (vm->PTD == NULL) {
*pa = va;
return (kd->nbpg - (int)offset);
}
if ((vm->PTD[pdei(vm,va)] & PG_V) == 0)
goto invalid;
pte_pa = (vm->PTD[pdei(vm,va)] & PG_FRAME) +
(ptei(vm,va) * sizeof(ptd_entry_t));
/* XXX READ PHYSICAL XXX */
if (_kvm_pread(kd, kd->pmfd, &pte, sizeof pte,
_kvm_pa2off(kd, pte_pa)) != sizeof pte)
goto invalid;
if ((pte & PG_V) == 0)
goto invalid;
*pa = (pte & PG_FRAME) + offset;
return (kd->nbpg - (int)offset);
invalid:
_kvm_err(kd, 0, "invalid address (%lx)", va);
return (0);
}
/*
* Translate a physical address to a file-offset in the crash-dump.
*/
off_t
_kvm_pa2off(kvm_t *kd, paddr_t pa)
{
return ((off_t)(kd->dump_off + pa));
}
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