svn commit: r190786 - head/lib/libkvm
Marcel Moolenaar
marcel at FreeBSD.org
Mon Apr 6 14:52:11 PDT 2009
Author: marcel
Date: Mon Apr 6 21:52:10 2009
New Revision: 190786
URL: http://svn.freebsd.org/changeset/base/190786
Log:
Add support for PowerPC kernel core files. This commit only adds
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.
Modified:
head/lib/libkvm/kvm_powerpc.c
Modified: head/lib/libkvm/kvm_powerpc.c
==============================================================================
--- head/lib/libkvm/kvm_powerpc.c Mon Apr 6 21:11:08 2009 (r190785)
+++ head/lib/libkvm/kvm_powerpc.c Mon Apr 6 21:52:10 2009 (r190786)
@@ -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;
+
+ if (strcmp(dh->magic, KERNELDUMPMAGIC) != 0)
+ return (0);
+ if (strcmp(dh->architecture, "powerpc") != 0)
+ return (0);
+ /* That should do it... */
+ return (sizeof(*dh));
}
-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;
+/*
+ * 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)
{
- _kvm_err(kd, 0, "pa2off not yet implemented!");
- return 0;
+ 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);
}
/*
- * 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)
+ * 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_initvtop(kvm_t *kd)
+{
+
+ 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_mdopen(kd)
- kvm_t *kd;
+_kvm_kvatop(kvm_t *kd, u_long va, off_t *ofs)
{
+ struct vmstate *vm;
-#ifdef FBSD_NOT_YET
- kd->usrstack = USRSTACK;
- kd->min_uva = VM_MIN_ADDRESS;
- kd->max_uva = VM_MAXUSER_ADDRESS;
-#endif
+ 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);
}
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