diff options
Diffstat (limited to 'lib/libkvm/kvm_powerpc.c')
| -rw-r--r-- | lib/libkvm/kvm_powerpc.c | 237 |
1 files changed, 237 insertions, 0 deletions
diff --git a/lib/libkvm/kvm_powerpc.c b/lib/libkvm/kvm_powerpc.c new file mode 100644 index 0000000000000..9e596b6000aab --- /dev/null +++ b/lib/libkvm/kvm_powerpc.c @@ -0,0 +1,237 @@ +/*- + * SPDX-License-Identifier: BSD-3-Clause + * + * Copyright (c) 2008, Juniper Networks, Inc. + * All rights reserved. + * + * 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 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 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 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 <elf.h> +#include <kvm.h> +#include <limits.h> +#include <stdlib.h> +#include <string.h> + +#include "kvm_private.h" + +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 (!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); +} + +static size_t +dump_header_size(struct kerneldumpheader *dh) +{ + + if (strcmp(dh->magic, KERNELDUMPMAGIC) != 0) + return (0); + if (strcmp(dh->architecture, "powerpc") != 0) + return (0); + /* That should do it... */ + return (sizeof(*dh)); +} + +/* + * 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 = sizeof(*vm->eh) + sizeof(struct kerneldumpheader); + 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 corefile 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: + _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, kvaddr_t 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))); +} + +static void +_powerpc_freevtop(kvm_t *kd) +{ + struct vmstate *vm = kd->vmst; + + if (vm->eh != MAP_FAILED) + munmap(vm->eh, vm->mapsz); + free(vm); + kd->vmst = NULL; +} + +static int +_powerpc_probe(kvm_t *kd) +{ + + return (_kvm_probe_elf_kernel(kd, ELFCLASS32, EM_PPC) && + kd->nlehdr.e_ident[EI_DATA] == ELFDATA2MSB); +} + +static int +_powerpc_initvtop(kvm_t *kd) +{ + + kd->vmst = (struct vmstate *)_kvm_malloc(kd, sizeof(*kd->vmst)); + if (kd->vmst == NULL) + return (-1); + + if (powerpc_maphdrs(kd) == -1) + return (-1); + + return (0); +} + +static int +_powerpc_kvatop(kvm_t *kd, kvaddr_t va, off_t *ofs) +{ + struct vmstate *vm; + + vm = kd->vmst; + if (be32toh(vm->ph->p_paddr) == 0xffffffff) + return ((int)powerpc_va2off(kd, va, ofs)); + + _kvm_err(kd, kd->program, "Raw corefile not supported"); + return (0); +} + +static int +_powerpc_native(kvm_t *kd __unused) +{ + +#if defined(__powerpc__) && !defined(__powerpc64__) + return (1); +#else + return (0); +#endif +} + +static struct kvm_arch kvm_powerpc = { + .ka_probe = _powerpc_probe, + .ka_initvtop = _powerpc_initvtop, + .ka_freevtop = _powerpc_freevtop, + .ka_kvatop = _powerpc_kvatop, + .ka_native = _powerpc_native, +}; + +KVM_ARCH(kvm_powerpc); |