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Add support for PowerPC kernel core files. This commit only adds

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support for virtual core files (aka minidumps). physical core
files are not supported.

The implementation is cross-tool ready and can be used in a non-
powerpc hosted debugger to analyze PowerPC core files. It also
accepts core files that still have the dump header, as can be
the case within Juniper where TFTP-based kernel core files are
supported and savecore is not used to "extract" the core file
from some dump device.

Obtained from:	Juniper Networks, Inc.
This commit is contained in:
Marcel Moolenaar 2009-04-06 21:52:10 +00:00
parent 3429118095
commit a5a8dffc5b
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=190786
1 changed files with 174 additions and 59 deletions
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233
lib/libkvm/kvm_powerpc.c
View File

@ -1,8 +1,5 @@
/* $NetBSD: kvm_powerpc.c,v 1.4 1998/02/03 06:50:07 mycroft Exp $ */
/*-
* Copyright (C) 1996 Wolfgang Solfrank.
* Copyright (C) 1996 TooLs GmbH.
* Copyright (c) 2008, Juniper Networks, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
@ -13,91 +10,209 @@
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by TooLs GmbH.
* 4. The name of TooLs GmbH may not be used to endorse or promote products
* derived from this software without specific prior written permission.
* 3. Neither the name of the author nor the names of any co-contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 TOOLS GMBH 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.
*/
/*
* PowerPC machine dependent routines for kvm.
* IN NO EVENT SHALL THE AUTHOR 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("$FreeBSD$");
#include <sys/param.h>
#include <sys/endian.h>
#include <sys/kerneldump.h>
#include <sys/mman.h>
#include <vm/vm.h>
#include <db.h>
#include <elf.h>
#include <limits.h>
#include <kvm.h>
#include <stdlib.h>
#include "kvm_private.h"
void
_kvm_freevtop(kd)
kvm_t *kd;
struct vmstate {
void *map;
size_t mapsz;
size_t dmphdrsz;
Elf32_Ehdr *eh;
Elf32_Phdr *ph;
};
static int
valid_elf_header(Elf32_Ehdr *eh)
{
if (kd->vmst != 0)
free(kd->vmst);
if (!IS_ELF(*eh))
return (0);
if (eh->e_ident[EI_CLASS] != ELFCLASS32)
return (0);
if (eh->e_ident[EI_DATA] != ELFDATA2MSB)
return (0);
if (eh->e_ident[EI_VERSION] != EV_CURRENT)
return (0);
if (eh->e_ident[EI_OSABI] != ELFOSABI_STANDALONE)
return (0);
if (be16toh(eh->e_type) != ET_CORE)
return (0);
if (be16toh(eh->e_machine) != EM_PPC)
return (0);
/* Can't think of anything else to check... */
return (1);
}
int
_kvm_initvtop(kd)
kvm_t *kd;
static size_t
dump_header_size(struct kerneldumpheader *dh)
{
return 0;
}
int
_kvm_kvatop(kd, va, pa)
kvm_t *kd;
u_long va;
off_t *pa;
{
_kvm_err(kd, 0, "vatop not yet implemented!");
return 0;
}
off_t
_kvm_pa2off(kd, pa)
kvm_t *kd;
u_long pa;
{
_kvm_err(kd, 0, "pa2off not yet implemented!");
return 0;
if (strcmp(dh->magic, KERNELDUMPMAGIC) != 0)
return (0);
if (strcmp(dh->architecture, "powerpc") != 0)
return (0);
/* That should do it... */
return (sizeof(*dh));
}
/*
* 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)
* Map the ELF headers into the process' address space. We do this in two
* steps: first the ELF header itself and using that information the whole
* set of headers.
*/
static int
powerpc_maphdrs(kvm_t *kd)
{
struct vmstate *vm;
size_t mapsz;
vm = kd->vmst;
vm->mapsz = PAGE_SIZE;
vm->map = mmap(NULL, vm->mapsz, PROT_READ, MAP_PRIVATE, kd->pmfd, 0);
if (vm->map == MAP_FAILED) {
_kvm_err(kd, kd->program, "cannot map corefile");
return (-1);
}
vm->dmphdrsz = 0;
vm->eh = vm->map;
if (!valid_elf_header(vm->eh)) {
/*
* Hmmm, no ELF header. Maybe we still have a dump header.
* This is normal when the core file wasn't created by
* savecore(8), but instead was dumped over TFTP. We can
* easily skip the dump header...
*/
vm->dmphdrsz = dump_header_size(vm->map);
if (vm->dmphdrsz == 0)
goto inval;
vm->eh = (void *)((uintptr_t)vm->map + vm->dmphdrsz);
if (!valid_elf_header(vm->eh))
goto inval;
}
mapsz = be16toh(vm->eh->e_phentsize) * be16toh(vm->eh->e_phnum) +
be32toh(vm->eh->e_phoff);
munmap(vm->map, vm->mapsz);
/* Map all headers. */
vm->mapsz = vm->dmphdrsz + mapsz;
vm->map = mmap(NULL, vm->mapsz, PROT_READ, MAP_PRIVATE, kd->pmfd, 0);
if (vm->map == MAP_FAILED) {
_kvm_err(kd, kd->program, "cannot map corefle headers");
return (-1);
}
vm->eh = (void *)((uintptr_t)vm->map + vm->dmphdrsz);
vm->ph = (void *)((uintptr_t)vm->eh + be32toh(vm->eh->e_phoff));
return (0);
inval:
munmap(vm->map, vm->mapsz);
vm->map = MAP_FAILED;
_kvm_err(kd, kd->program, "invalid corefile");
return (-1);
}
/*
* Determine the offset within the corefile corresponding the virtual
* address. Return the number of contiguous bytes in the corefile or
* 0 when the virtual address is invalid.
*/
static size_t
powerpc_va2off(kvm_t *kd, u_long va, off_t *ofs)
{
struct vmstate *vm = kd->vmst;
Elf32_Phdr *ph;
int nph;
ph = vm->ph;
nph = be16toh(vm->eh->e_phnum);
while (nph && (va < be32toh(ph->p_vaddr) ||
va >= be32toh(ph->p_vaddr) + be32toh(ph->p_memsz))) {
nph--;
ph = (void *)((uintptr_t)ph + be16toh(vm->eh->e_phentsize));
}
if (nph == 0)
return (0);
/* Segment found. Return file offset and range. */
*ofs = vm->dmphdrsz + be32toh(ph->p_offset) +
(va - be32toh(ph->p_vaddr));
return (be32toh(ph->p_memsz) - (va - be32toh(ph->p_vaddr)));
}
void
_kvm_freevtop(kvm_t *kd)
{
struct vmstate *vm = kd->vmst;
if (vm == NULL)
return;
if (vm->eh != MAP_FAILED) {
munmap(vm->eh, vm->mapsz);
vm->eh = MAP_FAILED;
}
free(vm);
kd->vmst = NULL;
}
int
_kvm_mdopen(kd)
kvm_t *kd;
_kvm_initvtop(kvm_t *kd)
{
#ifdef FBSD_NOT_YET
kd->usrstack = USRSTACK;
kd->min_uva = VM_MIN_ADDRESS;
kd->max_uva = VM_MAXUSER_ADDRESS;
#endif
kd->vmst = (struct vmstate *)_kvm_malloc(kd, sizeof(*kd->vmst));
if (kd->vmst == NULL) {
_kvm_err(kd, kd->program, "out of virtual memory");
return (-1);
}
if (powerpc_maphdrs(kd) == -1) {
free(kd->vmst);
kd->vmst = NULL;
return (-1);
}
return (0);
}
int
_kvm_kvatop(kvm_t *kd, u_long va, off_t *ofs)
{
struct vmstate *vm;
vm = kd->vmst;
if (vm->ph->p_paddr == ~0U)
return ((int)powerpc_va2off(kd, va, ofs));
_kvm_err(kd, kd->program, "Raw corefile not supported");
return (0);
}