diff options
| -rw-r--r-- | lib/libkvm/kvm_powerpc.c | 225 |
1 files changed, 170 insertions, 55 deletions
diff --git a/lib/libkvm/kvm_powerpc.c b/lib/libkvm/kvm_powerpc.c index 24ab7fb..7e4941a 100644 --- a/lib/libkvm/kvm_powerpc.c +++ b/lib/libkvm/kvm_powerpc.c @@ -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; -{ - if (kd->vmst != 0) - free(kd->vmst); -} +struct vmstate { + void *map; + size_t mapsz; + size_t dmphdrsz; + Elf32_Ehdr *eh; + Elf32_Phdr *ph; +}; -int -_kvm_initvtop(kd) - kvm_t *kd; +static int +valid_elf_header(Elf32_Ehdr *eh) { - return 0; + + 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_kvatop(kd, va, pa) - kvm_t *kd; - u_long va; - off_t *pa; +static size_t +dump_header_size(struct kerneldumpheader *dh) { - _kvm_err(kd, 0, "vatop 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)); } -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); } |
