/* $NetBSD: libelf_xlate.c,v 1.4 2010/02/22 10:48:33 darran Exp $ */ /*- * Copyright (c) 2006 Joseph Koshy * 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. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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. */ #if HAVE_NBTOOL_CONFIG_H # include "nbtool_config.h" #endif #include /* __FBSDID("$FreeBSD: src/lib/libelf/libelf_xlate.c,v 1.3.2.1.2.1 2009/10/25 01:10:29 kensmith Exp $"); */ #include #include #include "_libelf.h" /* * Translate to/from the file representation of ELF objects. * * Translation could potentially involve the following * transformations: * * - an endianness conversion, * - a change of layout, as the file representation of ELF objects * can differ from their in-memory representation. * - a change in representation due to a layout version change. */ Elf_Data * _libelf_xlate(Elf_Data *dst, const Elf_Data *src, unsigned int encoding, int elfclass, int direction) { size_t cnt, dsz, fsz, msz; uintptr_t sb, se, db, de; if (encoding == ELFDATANONE) encoding = _libelf_host_byteorder(); if ((encoding != ELFDATA2LSB && encoding != ELFDATA2MSB) || dst == NULL || src == NULL || dst == src) { LIBELF_SET_ERROR(ARGUMENT, 0); return (NULL); } assert(elfclass == ELFCLASS32 || elfclass == ELFCLASS64); assert(direction == ELF_TOFILE || direction == ELF_TOMEMORY); if (dst->d_version != src->d_version) { LIBELF_SET_ERROR(UNIMPL, 0); return (NULL); } if (src->d_buf == NULL || dst->d_buf == NULL) { LIBELF_SET_ERROR(DATA, 0); return (NULL); } if ((int) src->d_type < 0 || src->d_type >= ELF_T_NUM) { LIBELF_SET_ERROR(DATA, 0); return (NULL); } if ((fsz = (elfclass == ELFCLASS32 ? elf32_fsize : elf64_fsize) (src->d_type, (size_t) 1, src->d_version)) == 0) return (NULL); msz = _libelf_msize(src->d_type, elfclass, src->d_version); assert(msz > 0); if (src->d_size % (direction == ELF_TOMEMORY ? fsz : msz)) { LIBELF_SET_ERROR(DATA, 0); return (NULL); } /* * Determine the number of objects that need to be converted, and * the space required for the converted objects in the destination * buffer. */ if (direction == ELF_TOMEMORY) { cnt = src->d_size / fsz; dsz = cnt * msz; } else { cnt = src->d_size / msz; dsz = cnt * fsz; } if (dst->d_size < dsz) { LIBELF_SET_ERROR(DATA, 0); return (NULL); } sb = (uintptr_t) src->d_buf; se = sb + src->d_size; db = (uintptr_t) dst->d_buf; de = db + dst->d_size; /* * Check for overlapping buffers. Note that db == sb is * allowed. */ if (db != sb && de > sb && se > db) { LIBELF_SET_ERROR(DATA, 0); return (NULL); } if ((direction == ELF_TOMEMORY ? db : sb) % _libelf_malign(src->d_type, elfclass)) { LIBELF_SET_ERROR(DATA, 0); return (NULL); } dst->d_type = src->d_type; dst->d_size = dsz; if (src->d_size == 0 || (db == sb && encoding == _libelf_host_byteorder() && fsz == msz)) return (dst); /* nothing more to do */ (_libelf_get_translator(src->d_type, direction, elfclass))(dst->d_buf, src->d_buf, cnt, encoding != _libelf_host_byteorder()); return (dst); }