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/*-
* Copyright (c) 2006 Peter Wemm
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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("$FreeBSD$");
/*
* i386 machine dependent routines for kvm and minidumps.
*/
#include <sys/param.h>
#include <sys/endian.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <kvm.h>
#include "../../sys/i386/include/minidump.h"
#include <limits.h>
#include "kvm_private.h"
#include "kvm_i386.h"
#define i386_round_page(x) roundup2((kvaddr_t)(x), I386_PAGE_SIZE)
struct vmstate {
struct minidumphdr hdr;
struct hpt hpt;
void *ptemap;
};
static int
_i386_minidump_probe(kvm_t *kd)
{
return (_kvm_probe_elf_kernel(kd, ELFCLASS32, EM_386) &&
_kvm_is_minidump(kd));
}
static void
_i386_minidump_freevtop(kvm_t *kd)
{
struct vmstate *vm = kd->vmst;
_kvm_hpt_free(&vm->hpt);
if (vm->ptemap)
free(vm->ptemap);
free(vm);
kd->vmst = NULL;
}
static int
_i386_minidump_initvtop(kvm_t *kd)
{
struct vmstate *vmst;
uint32_t *bitmap;
off_t off;
vmst = _kvm_malloc(kd, sizeof(*vmst));
if (vmst == NULL) {
_kvm_err(kd, kd->program, "cannot allocate vm");
return (-1);
}
kd->vmst = vmst;
if (pread(kd->pmfd, &vmst->hdr, sizeof(vmst->hdr), 0) !=
sizeof(vmst->hdr)) {
_kvm_err(kd, kd->program, "cannot read dump header");
return (-1);
}
if (strncmp(MINIDUMP_MAGIC, vmst->hdr.magic, sizeof(vmst->hdr.magic)) != 0) {
_kvm_err(kd, kd->program, "not a minidump for this platform");
return (-1);
}
vmst->hdr.version = le32toh(vmst->hdr.version);
if (vmst->hdr.version != MINIDUMP_VERSION) {
_kvm_err(kd, kd->program, "wrong minidump version. expected %d got %d",
MINIDUMP_VERSION, vmst->hdr.version);
return (-1);
}
vmst->hdr.msgbufsize = le32toh(vmst->hdr.msgbufsize);
vmst->hdr.bitmapsize = le32toh(vmst->hdr.bitmapsize);
vmst->hdr.ptesize = le32toh(vmst->hdr.ptesize);
vmst->hdr.kernbase = le32toh(vmst->hdr.kernbase);
vmst->hdr.paemode = le32toh(vmst->hdr.paemode);
/* Skip header and msgbuf */
off = I386_PAGE_SIZE + i386_round_page(vmst->hdr.msgbufsize);
bitmap = _kvm_malloc(kd, vmst->hdr.bitmapsize);
if (bitmap == NULL) {
_kvm_err(kd, kd->program, "cannot allocate %d bytes for bitmap", vmst->hdr.bitmapsize);
return (-1);
}
if (pread(kd->pmfd, bitmap, vmst->hdr.bitmapsize, off) !=
(ssize_t)vmst->hdr.bitmapsize) {
_kvm_err(kd, kd->program, "cannot read %d bytes for page bitmap", vmst->hdr.bitmapsize);
free(bitmap);
return (-1);
}
off += i386_round_page(vmst->hdr.bitmapsize);
vmst->ptemap = _kvm_malloc(kd, vmst->hdr.ptesize);
if (vmst->ptemap == NULL) {
_kvm_err(kd, kd->program, "cannot allocate %d bytes for ptemap", vmst->hdr.ptesize);
free(bitmap);
return (-1);
}
if (pread(kd->pmfd, vmst->ptemap, vmst->hdr.ptesize, off) !=
(ssize_t)vmst->hdr.ptesize) {
_kvm_err(kd, kd->program, "cannot read %d bytes for ptemap", vmst->hdr.ptesize);
free(bitmap);
return (-1);
}
off += vmst->hdr.ptesize;
/* build physical address hash table for sparse pages */
_kvm_hpt_init(kd, &vmst->hpt, bitmap, vmst->hdr.bitmapsize, off,
I386_PAGE_SIZE, sizeof(*bitmap));
free(bitmap);
return (0);
}
static int
_i386_minidump_vatop_pae(kvm_t *kd, kvaddr_t va, off_t *pa)
{
struct vmstate *vm;
i386_physaddr_pae_t offset;
i386_pte_pae_t pte;
kvaddr_t pteindex;
i386_physaddr_pae_t a;
off_t ofs;
i386_pte_pae_t *ptemap;
vm = kd->vmst;
ptemap = vm->ptemap;
offset = va & I386_PAGE_MASK;
if (va >= vm->hdr.kernbase) {
pteindex = (va - vm->hdr.kernbase) >> I386_PAGE_SHIFT;
pte = le64toh(ptemap[pteindex]);
if ((pte & I386_PG_V) == 0) {
_kvm_err(kd, kd->program,
"_i386_minidump_vatop_pae: pte not valid");
goto invalid;
}
a = pte & I386_PG_FRAME_PAE;
ofs = _kvm_hpt_find(&vm->hpt, a);
if (ofs == -1) {
_kvm_err(kd, kd->program,
"_i386_minidump_vatop_pae: physical address 0x%jx not in minidump",
(uintmax_t)a);
goto invalid;
}
*pa = ofs + offset;
return (I386_PAGE_SIZE - offset);
} else {
_kvm_err(kd, kd->program,
"_i386_minidump_vatop_pae: virtual address 0x%jx not minidumped",
(uintmax_t)va);
goto invalid;
}
invalid:
_kvm_err(kd, 0, "invalid address (0x%jx)", (uintmax_t)va);
return (0);
}
static int
_i386_minidump_vatop(kvm_t *kd, kvaddr_t va, off_t *pa)
{
struct vmstate *vm;
i386_physaddr_t offset;
i386_pte_t pte;
kvaddr_t pteindex;
i386_physaddr_t a;
off_t ofs;
i386_pte_t *ptemap;
vm = kd->vmst;
ptemap = vm->ptemap;
offset = va & I386_PAGE_MASK;
if (va >= vm->hdr.kernbase) {
pteindex = (va - vm->hdr.kernbase) >> I386_PAGE_SHIFT;
pte = le32toh(ptemap[pteindex]);
if ((pte & I386_PG_V) == 0) {
_kvm_err(kd, kd->program,
"_i386_minidump_vatop: pte not valid");
goto invalid;
}
a = pte & I386_PG_FRAME;
ofs = _kvm_hpt_find(&vm->hpt, a);
if (ofs == -1) {
_kvm_err(kd, kd->program,
"_i386_minidump_vatop: physical address 0x%jx not in minidump",
(uintmax_t)a);
goto invalid;
}
*pa = ofs + offset;
return (I386_PAGE_SIZE - offset);
} else {
_kvm_err(kd, kd->program,
"_i386_minidump_vatop: virtual address 0x%jx not minidumped",
(uintmax_t)va);
goto invalid;
}
invalid:
_kvm_err(kd, 0, "invalid address (0x%jx)", (uintmax_t)va);
return (0);
}
static int
_i386_minidump_kvatop(kvm_t *kd, kvaddr_t va, off_t *pa)
{
if (ISALIVE(kd)) {
_kvm_err(kd, 0, "_i386_minidump_kvatop called in live kernel!");
return (0);
}
if (kd->vmst->hdr.paemode)
return (_i386_minidump_vatop_pae(kd, va, pa));
else
return (_i386_minidump_vatop(kd, va, pa));
}
struct kvm_arch kvm_i386_minidump = {
.ka_probe = _i386_minidump_probe,
.ka_initvtop = _i386_minidump_initvtop,
.ka_freevtop = _i386_minidump_freevtop,
.ka_kvatop = _i386_minidump_kvatop,
.ka_native = _i386_native,
};
KVM_ARCH(kvm_i386_minidump);
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