668a5be3a1
- Fix -Wunused warnings with *_native detection handlers by marking `kd` __unused, except with arm/mips, where a slightly more complicated scheme is required to handle the native case vs the non-native case. - Fix -Wmissing-variable-declarations warnings by marking struct kvm_arch objects static. Differential Revision: D10071 MFC after: 1 week Reviewed by: vangyzen Tested with: WIP test code (D10024) // kgdb7121 (i386 crash/kernel on amd64) Sponsored by: Dell EMC Isilon
431 lines
10 KiB
C
431 lines
10 KiB
C
/*-
|
|
* 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>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#if defined(LIBC_SCCS) && !defined(lint)
|
|
#if 0
|
|
static char sccsid[] = "@(#)kvm_hp300.c 8.1 (Berkeley) 6/4/93";
|
|
#endif
|
|
#endif /* LIBC_SCCS and not lint */
|
|
|
|
/*
|
|
* i386 machine dependent routines for kvm. Hopefully, the forthcoming
|
|
* vm code will one day obsolete this module.
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/endian.h>
|
|
#include <stdint.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
#include <kvm.h>
|
|
|
|
#ifdef __i386__
|
|
#include <machine/vmparam.h> /* For KERNBASE. */
|
|
#endif
|
|
|
|
#include <limits.h>
|
|
|
|
#include "kvm_private.h"
|
|
#include "kvm_i386.h"
|
|
|
|
struct vmstate {
|
|
void *PTD;
|
|
int pae;
|
|
size_t phnum;
|
|
GElf_Phdr *phdr;
|
|
};
|
|
|
|
/*
|
|
* Translate a physical memory address to a file-offset in the crash-dump.
|
|
*/
|
|
static size_t
|
|
_kvm_pa2off(kvm_t *kd, uint64_t pa, off_t *ofs)
|
|
{
|
|
struct vmstate *vm = kd->vmst;
|
|
GElf_Phdr *p;
|
|
size_t n;
|
|
|
|
if (kd->rawdump) {
|
|
*ofs = pa;
|
|
return (I386_PAGE_SIZE - (pa & I386_PAGE_MASK));
|
|
}
|
|
|
|
p = vm->phdr;
|
|
n = vm->phnum;
|
|
while (n && (pa < p->p_paddr || pa >= p->p_paddr + p->p_memsz))
|
|
p++, n--;
|
|
if (n == 0)
|
|
return (0);
|
|
*ofs = (pa - p->p_paddr) + p->p_offset;
|
|
return (I386_PAGE_SIZE - (pa & I386_PAGE_MASK));
|
|
}
|
|
|
|
static void
|
|
_i386_freevtop(kvm_t *kd)
|
|
{
|
|
struct vmstate *vm = kd->vmst;
|
|
|
|
if (vm->PTD)
|
|
free(vm->PTD);
|
|
free(vm->phdr);
|
|
free(vm);
|
|
kd->vmst = NULL;
|
|
}
|
|
|
|
static int
|
|
_i386_probe(kvm_t *kd)
|
|
{
|
|
|
|
return (_kvm_probe_elf_kernel(kd, ELFCLASS32, EM_386) &&
|
|
!_kvm_is_minidump(kd));
|
|
}
|
|
|
|
static int
|
|
_i386_initvtop(kvm_t *kd)
|
|
{
|
|
struct kvm_nlist nl[2];
|
|
i386_physaddr_t pa;
|
|
kvaddr_t kernbase;
|
|
char *PTD;
|
|
int i;
|
|
|
|
kd->vmst = (struct vmstate *)_kvm_malloc(kd, sizeof(struct vmstate));
|
|
if (kd->vmst == NULL) {
|
|
_kvm_err(kd, kd->program, "cannot allocate vm");
|
|
return (-1);
|
|
}
|
|
kd->vmst->PTD = 0;
|
|
|
|
if (kd->rawdump == 0) {
|
|
if (_kvm_read_core_phdrs(kd, &kd->vmst->phnum,
|
|
&kd->vmst->phdr) == -1)
|
|
return (-1);
|
|
}
|
|
|
|
nl[0].n_name = "kernbase";
|
|
nl[1].n_name = 0;
|
|
|
|
if (kvm_nlist2(kd, nl) != 0) {
|
|
#ifdef __i386__
|
|
kernbase = KERNBASE; /* for old kernels */
|
|
#else
|
|
_kvm_err(kd, kd->program, "cannot resolve kernbase");
|
|
return (-1);
|
|
#endif
|
|
} else
|
|
kernbase = nl[0].n_value;
|
|
|
|
nl[0].n_name = "IdlePDPT";
|
|
nl[1].n_name = 0;
|
|
|
|
if (kvm_nlist2(kd, nl) == 0) {
|
|
i386_physaddr_pae_t pa64;
|
|
|
|
if (kvm_read2(kd, (nl[0].n_value - kernbase), &pa,
|
|
sizeof(pa)) != sizeof(pa)) {
|
|
_kvm_err(kd, kd->program, "cannot read IdlePDPT");
|
|
return (-1);
|
|
}
|
|
pa = le32toh(pa);
|
|
PTD = _kvm_malloc(kd, 4 * I386_PAGE_SIZE);
|
|
if (PTD == NULL) {
|
|
_kvm_err(kd, kd->program, "cannot allocate PTD");
|
|
return (-1);
|
|
}
|
|
for (i = 0; i < 4; i++) {
|
|
if (kvm_read2(kd, pa + (i * sizeof(pa64)), &pa64,
|
|
sizeof(pa64)) != sizeof(pa64)) {
|
|
_kvm_err(kd, kd->program, "Cannot read PDPT");
|
|
free(PTD);
|
|
return (-1);
|
|
}
|
|
pa64 = le64toh(pa64);
|
|
if (kvm_read2(kd, pa64 & I386_PG_FRAME_PAE,
|
|
PTD + (i * I386_PAGE_SIZE), I386_PAGE_SIZE) !=
|
|
I386_PAGE_SIZE) {
|
|
_kvm_err(kd, kd->program, "cannot read PDPT");
|
|
free(PTD);
|
|
return (-1);
|
|
}
|
|
}
|
|
kd->vmst->PTD = PTD;
|
|
kd->vmst->pae = 1;
|
|
} else {
|
|
nl[0].n_name = "IdlePTD";
|
|
nl[1].n_name = 0;
|
|
|
|
if (kvm_nlist2(kd, nl) != 0) {
|
|
_kvm_err(kd, kd->program, "bad namelist");
|
|
return (-1);
|
|
}
|
|
if (kvm_read2(kd, (nl[0].n_value - kernbase), &pa,
|
|
sizeof(pa)) != sizeof(pa)) {
|
|
_kvm_err(kd, kd->program, "cannot read IdlePTD");
|
|
return (-1);
|
|
}
|
|
pa = le32toh(pa);
|
|
PTD = _kvm_malloc(kd, I386_PAGE_SIZE);
|
|
if (PTD == NULL) {
|
|
_kvm_err(kd, kd->program, "cannot allocate PTD");
|
|
return (-1);
|
|
}
|
|
if (kvm_read2(kd, pa, PTD, I386_PAGE_SIZE) != I386_PAGE_SIZE) {
|
|
_kvm_err(kd, kd->program, "cannot read PTD");
|
|
return (-1);
|
|
}
|
|
kd->vmst->PTD = PTD;
|
|
kd->vmst->pae = 0;
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
_i386_vatop(kvm_t *kd, kvaddr_t va, off_t *pa)
|
|
{
|
|
struct vmstate *vm;
|
|
i386_physaddr_t offset;
|
|
i386_physaddr_t pte_pa;
|
|
i386_pde_t pde;
|
|
i386_pte_t pte;
|
|
kvaddr_t pdeindex;
|
|
kvaddr_t pteindex;
|
|
size_t s;
|
|
i386_physaddr_t a;
|
|
off_t ofs;
|
|
i386_pde_t *PTD;
|
|
|
|
vm = kd->vmst;
|
|
PTD = (i386_pde_t *)vm->PTD;
|
|
offset = va & I386_PAGE_MASK;
|
|
|
|
/*
|
|
* If we are initializing (kernel page table descriptor pointer
|
|
* not yet set) then return pa == va to avoid infinite recursion.
|
|
*/
|
|
if (PTD == NULL) {
|
|
s = _kvm_pa2off(kd, va, pa);
|
|
if (s == 0) {
|
|
_kvm_err(kd, kd->program,
|
|
"_i386_vatop: bootstrap data not in dump");
|
|
goto invalid;
|
|
} else
|
|
return (I386_PAGE_SIZE - offset);
|
|
}
|
|
|
|
pdeindex = va >> I386_PDRSHIFT;
|
|
pde = le32toh(PTD[pdeindex]);
|
|
if ((pde & I386_PG_V) == 0) {
|
|
_kvm_err(kd, kd->program, "_i386_vatop: pde not valid");
|
|
goto invalid;
|
|
}
|
|
|
|
if (pde & I386_PG_PS) {
|
|
/*
|
|
* No second-level page table; ptd describes one 4MB
|
|
* page. (We assume that the kernel wouldn't set
|
|
* PG_PS without enabling it cr0).
|
|
*/
|
|
offset = va & I386_PAGE_PS_MASK;
|
|
a = (pde & I386_PG_PS_FRAME) + offset;
|
|
s = _kvm_pa2off(kd, a, pa);
|
|
if (s == 0) {
|
|
_kvm_err(kd, kd->program,
|
|
"_i386_vatop: 4MB page address not in dump");
|
|
goto invalid;
|
|
}
|
|
return (I386_NBPDR - offset);
|
|
}
|
|
|
|
pteindex = (va >> I386_PAGE_SHIFT) & (I386_NPTEPG - 1);
|
|
pte_pa = (pde & I386_PG_FRAME) + (pteindex * sizeof(pte));
|
|
|
|
s = _kvm_pa2off(kd, pte_pa, &ofs);
|
|
if (s < sizeof(pte)) {
|
|
_kvm_err(kd, kd->program, "_i386_vatop: pte_pa not found");
|
|
goto invalid;
|
|
}
|
|
|
|
/* XXX This has to be a physical address read, kvm_read is virtual */
|
|
if (pread(kd->pmfd, &pte, sizeof(pte), ofs) != sizeof(pte)) {
|
|
_kvm_syserr(kd, kd->program, "_i386_vatop: pread");
|
|
goto invalid;
|
|
}
|
|
pte = le32toh(pte);
|
|
if ((pte & I386_PG_V) == 0) {
|
|
_kvm_err(kd, kd->program, "_kvm_kvatop: pte not valid");
|
|
goto invalid;
|
|
}
|
|
|
|
a = (pte & I386_PG_FRAME) + offset;
|
|
s = _kvm_pa2off(kd, a, pa);
|
|
if (s == 0) {
|
|
_kvm_err(kd, kd->program, "_i386_vatop: address not in dump");
|
|
goto invalid;
|
|
} else
|
|
return (I386_PAGE_SIZE - offset);
|
|
|
|
invalid:
|
|
_kvm_err(kd, 0, "invalid address (0x%jx)", (uintmax_t)va);
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
_i386_vatop_pae(kvm_t *kd, kvaddr_t va, off_t *pa)
|
|
{
|
|
struct vmstate *vm;
|
|
i386_physaddr_pae_t offset;
|
|
i386_physaddr_pae_t pte_pa;
|
|
i386_pde_pae_t pde;
|
|
i386_pte_pae_t pte;
|
|
kvaddr_t pdeindex;
|
|
kvaddr_t pteindex;
|
|
size_t s;
|
|
i386_physaddr_pae_t a;
|
|
off_t ofs;
|
|
i386_pde_pae_t *PTD;
|
|
|
|
vm = kd->vmst;
|
|
PTD = (i386_pde_pae_t *)vm->PTD;
|
|
offset = va & I386_PAGE_MASK;
|
|
|
|
/*
|
|
* If we are initializing (kernel page table descriptor pointer
|
|
* not yet set) then return pa == va to avoid infinite recursion.
|
|
*/
|
|
if (PTD == NULL) {
|
|
s = _kvm_pa2off(kd, va, pa);
|
|
if (s == 0) {
|
|
_kvm_err(kd, kd->program,
|
|
"_i386_vatop_pae: bootstrap data not in dump");
|
|
goto invalid;
|
|
} else
|
|
return (I386_PAGE_SIZE - offset);
|
|
}
|
|
|
|
pdeindex = va >> I386_PDRSHIFT_PAE;
|
|
pde = le64toh(PTD[pdeindex]);
|
|
if ((pde & I386_PG_V) == 0) {
|
|
_kvm_err(kd, kd->program, "_kvm_kvatop_pae: pde not valid");
|
|
goto invalid;
|
|
}
|
|
|
|
if (pde & I386_PG_PS) {
|
|
/*
|
|
* No second-level page table; ptd describes one 2MB
|
|
* page. (We assume that the kernel wouldn't set
|
|
* PG_PS without enabling it cr0).
|
|
*/
|
|
offset = va & I386_PAGE_PS_MASK_PAE;
|
|
a = (pde & I386_PG_PS_FRAME_PAE) + offset;
|
|
s = _kvm_pa2off(kd, a, pa);
|
|
if (s == 0) {
|
|
_kvm_err(kd, kd->program,
|
|
"_i386_vatop: 2MB page address not in dump");
|
|
goto invalid;
|
|
}
|
|
return (I386_NBPDR_PAE - offset);
|
|
}
|
|
|
|
pteindex = (va >> I386_PAGE_SHIFT) & (I386_NPTEPG_PAE - 1);
|
|
pte_pa = (pde & I386_PG_FRAME_PAE) + (pteindex * sizeof(pde));
|
|
|
|
s = _kvm_pa2off(kd, pte_pa, &ofs);
|
|
if (s < sizeof(pte)) {
|
|
_kvm_err(kd, kd->program, "_i386_vatop_pae: pdpe_pa not found");
|
|
goto invalid;
|
|
}
|
|
|
|
/* XXX This has to be a physical address read, kvm_read is virtual */
|
|
if (pread(kd->pmfd, &pte, sizeof(pte), ofs) != sizeof(pte)) {
|
|
_kvm_syserr(kd, kd->program, "_i386_vatop_pae: read");
|
|
goto invalid;
|
|
}
|
|
pte = le64toh(pte);
|
|
if ((pte & I386_PG_V) == 0) {
|
|
_kvm_err(kd, kd->program, "_i386_vatop_pae: pte not valid");
|
|
goto invalid;
|
|
}
|
|
|
|
a = (pte & I386_PG_FRAME_PAE) + offset;
|
|
s = _kvm_pa2off(kd, a, pa);
|
|
if (s == 0) {
|
|
_kvm_err(kd, kd->program,
|
|
"_i386_vatop_pae: address not in dump");
|
|
goto invalid;
|
|
} else
|
|
return (I386_PAGE_SIZE - offset);
|
|
|
|
invalid:
|
|
_kvm_err(kd, 0, "invalid address (0x%jx)", (uintmax_t)va);
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
_i386_kvatop(kvm_t *kd, kvaddr_t va, off_t *pa)
|
|
{
|
|
|
|
if (ISALIVE(kd)) {
|
|
_kvm_err(kd, 0, "vatop called in live kernel!");
|
|
return (0);
|
|
}
|
|
if (kd->vmst->pae)
|
|
return (_i386_vatop_pae(kd, va, pa));
|
|
else
|
|
return (_i386_vatop(kd, va, pa));
|
|
}
|
|
|
|
int
|
|
_i386_native(kvm_t *kd __unused)
|
|
{
|
|
|
|
#ifdef __i386__
|
|
return (1);
|
|
#else
|
|
return (0);
|
|
#endif
|
|
}
|
|
|
|
static struct kvm_arch kvm_i386 = {
|
|
.ka_probe = _i386_probe,
|
|
.ka_initvtop = _i386_initvtop,
|
|
.ka_freevtop = _i386_freevtop,
|
|
.ka_kvatop = _i386_kvatop,
|
|
.ka_native = _i386_native,
|
|
};
|
|
|
|
KVM_ARCH(kvm_i386);
|