f4eb39ba6b
* Add missing _kvm16toh() function. * Teach libkvm about powerpc64le. Sponsored by: Tag1 Consulting, Inc.
271 lines
6.8 KiB
C
271 lines
6.8 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 2008, Juniper Networks, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the author nor the names of any co-contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/endian.h>
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#include <sys/kerneldump.h>
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#include <sys/mman.h>
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#include <elf.h>
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#include <kvm.h>
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#include <limits.h>
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#include <stdlib.h>
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#include <string.h>
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#include "kvm_private.h"
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struct vmstate {
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void *map;
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size_t mapsz;
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size_t dmphdrsz;
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Elf64_Ehdr *eh;
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Elf64_Phdr *ph;
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};
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static int
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valid_elf_header(kvm_t *kd, Elf64_Ehdr *eh)
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{
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if (!IS_ELF(*eh))
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return (0);
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if (eh->e_ident[EI_CLASS] != ELFCLASS64)
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return (0);
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if (eh->e_ident[EI_DATA] != ELFDATA2MSB &&
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eh->e_ident[EI_DATA] != ELFDATA2LSB)
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return (0);
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if (eh->e_ident[EI_VERSION] != EV_CURRENT)
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return (0);
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if (eh->e_ident[EI_OSABI] != ELFOSABI_STANDALONE)
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return (0);
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if (_kvm16toh(kd, eh->e_type) != ET_CORE)
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return (0);
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if (_kvm16toh(kd, eh->e_machine) != EM_PPC64)
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return (0);
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/* Can't think of anything else to check... */
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return (1);
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}
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static size_t
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dump_header_size(struct kerneldumpheader *dh)
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{
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if (strcmp(dh->magic, KERNELDUMPMAGIC) != 0)
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return (0);
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if (strcmp(dh->architecture, "powerpc64") != 0 &&
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strcmp(dh->architecture, "powerpc64le") != 0)
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return (0);
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/* That should do it... */
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return (sizeof(*dh));
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}
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/*
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* Map the ELF headers into the process' address space. We do this in two
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* steps: first the ELF header itself and using that information the whole
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* set of headers.
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*/
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static int
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powerpc_maphdrs(kvm_t *kd)
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{
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struct vmstate *vm;
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size_t mapsz;
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vm = kd->vmst;
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vm->mapsz = sizeof(*vm->eh) + sizeof(struct kerneldumpheader);
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vm->map = mmap(NULL, vm->mapsz, PROT_READ, MAP_PRIVATE, kd->pmfd, 0);
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if (vm->map == MAP_FAILED) {
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_kvm_err(kd, kd->program, "cannot map corefile");
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return (-1);
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}
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vm->dmphdrsz = 0;
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vm->eh = vm->map;
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if (!valid_elf_header(kd, vm->eh)) {
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/*
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* Hmmm, no ELF header. Maybe we still have a dump header.
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* This is normal when the core file wasn't created by
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* savecore(8), but instead was dumped over TFTP. We can
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* easily skip the dump header...
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*/
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vm->dmphdrsz = dump_header_size(vm->map);
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if (vm->dmphdrsz == 0)
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goto inval;
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vm->eh = (void *)((uintptr_t)vm->map + vm->dmphdrsz);
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if (!valid_elf_header(kd, vm->eh))
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goto inval;
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}
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mapsz = _kvm16toh(kd, vm->eh->e_phentsize) *
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_kvm16toh(kd, vm->eh->e_phnum) + _kvm64toh(kd, vm->eh->e_phoff);
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munmap(vm->map, vm->mapsz);
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/* Map all headers. */
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vm->mapsz = vm->dmphdrsz + mapsz;
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vm->map = mmap(NULL, vm->mapsz, PROT_READ, MAP_PRIVATE, kd->pmfd, 0);
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if (vm->map == MAP_FAILED) {
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_kvm_err(kd, kd->program, "cannot map corefile headers");
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return (-1);
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}
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vm->eh = (void *)((uintptr_t)vm->map + vm->dmphdrsz);
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vm->ph = (void *)((uintptr_t)vm->eh +
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(uintptr_t)_kvm64toh(kd, vm->eh->e_phoff));
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return (0);
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inval:
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_kvm_err(kd, kd->program, "invalid corefile");
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return (-1);
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}
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/*
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* Determine the offset within the corefile corresponding the virtual
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* address. Return the number of contiguous bytes in the corefile or
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* 0 when the virtual address is invalid.
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*/
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static size_t
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powerpc64_va2off(kvm_t *kd, kvaddr_t va, off_t *ofs)
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{
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struct vmstate *vm = kd->vmst;
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Elf64_Phdr *ph;
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int nph;
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ph = vm->ph;
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nph = _kvm16toh(kd, vm->eh->e_phnum);
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while (nph && (va < _kvm64toh(kd, ph->p_vaddr) ||
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va >= _kvm64toh(kd, ph->p_vaddr) + _kvm64toh(kd, ph->p_memsz))) {
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nph--;
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ph = (void *)((uintptr_t)ph +
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_kvm16toh(kd, vm->eh->e_phentsize));
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}
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if (nph == 0)
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return (0);
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/* Segment found. Return file offset and range. */
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*ofs = vm->dmphdrsz + _kvm64toh(kd, ph->p_offset) +
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(va - _kvm64toh(kd, ph->p_vaddr));
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return (_kvm64toh(kd, ph->p_memsz) -
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(va - _kvm64toh(kd, ph->p_vaddr)));
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}
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static void
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_powerpc64_freevtop(kvm_t *kd)
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{
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struct vmstate *vm = kd->vmst;
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if (vm->eh != MAP_FAILED)
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munmap(vm->eh, vm->mapsz);
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free(vm);
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kd->vmst = NULL;
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}
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static int
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_powerpc64_probe(kvm_t *kd)
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{
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return (_kvm_probe_elf_kernel(kd, ELFCLASS64, EM_PPC64) &&
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kd->nlehdr.e_ident[EI_DATA] == ELFDATA2MSB);
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}
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static int
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_powerpc64le_probe(kvm_t *kd)
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{
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return (_kvm_probe_elf_kernel(kd, ELFCLASS64, EM_PPC64) &&
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kd->nlehdr.e_ident[EI_DATA] == ELFDATA2LSB);
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}
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static int
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_powerpc64_initvtop(kvm_t *kd)
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{
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kd->vmst = (struct vmstate *)_kvm_malloc(kd, sizeof(*kd->vmst));
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if (kd->vmst == NULL)
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return (-1);
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if (powerpc_maphdrs(kd) == -1)
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return (-1);
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return (0);
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}
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static int
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_powerpc64_kvatop(kvm_t *kd, kvaddr_t va, off_t *ofs)
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{
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struct vmstate *vm;
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vm = kd->vmst;
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if (_kvm64toh(kd, vm->ph->p_paddr) == 0xffffffffffffffff)
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return ((int)powerpc64_va2off(kd, va, ofs));
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_kvm_err(kd, kd->program, "Raw corefile not supported");
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return (0);
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}
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static int
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_powerpc64_native(kvm_t *kd __unused)
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{
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#if defined(__powerpc64__) && BYTE_ORDER == BIG_ENDIAN
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return (1);
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#else
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return (0);
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#endif
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}
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static int
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_powerpc64le_native(kvm_t *kd __unused)
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{
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#if defined(__powerpc64__) && BYTE_ORDER == LITTLE_ENDIAN
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return (1);
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#else
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return (0);
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#endif
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}
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static struct kvm_arch kvm_powerpc64 = {
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.ka_probe = _powerpc64_probe,
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.ka_initvtop = _powerpc64_initvtop,
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.ka_freevtop = _powerpc64_freevtop,
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.ka_kvatop = _powerpc64_kvatop,
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.ka_native = _powerpc64_native,
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};
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static struct kvm_arch kvm_powerpc64le = {
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.ka_probe = _powerpc64le_probe,
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.ka_initvtop = _powerpc64_initvtop,
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.ka_freevtop = _powerpc64_freevtop,
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.ka_kvatop = _powerpc64_kvatop,
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.ka_native = _powerpc64le_native,
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};
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KVM_ARCH(kvm_powerpc64);
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KVM_ARCH(kvm_powerpc64le);
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