14484Sbinkertn@umich.edu/*- 24484Sbinkertn@umich.edu * Copyright (c) 2006 Joseph Koshy 34484Sbinkertn@umich.edu * All rights reserved. 44484Sbinkertn@umich.edu * 54484Sbinkertn@umich.edu * Redistribution and use in source and binary forms, with or without 64484Sbinkertn@umich.edu * modification, are permitted provided that the following conditions 74484Sbinkertn@umich.edu * are met: 84484Sbinkertn@umich.edu * 1. Redistributions of source code must retain the above copyright 94484Sbinkertn@umich.edu * notice, this list of conditions and the following disclaimer. 104484Sbinkertn@umich.edu * 2. Redistributions in binary form must reproduce the above copyright 114484Sbinkertn@umich.edu * notice, this list of conditions and the following disclaimer in the 124484Sbinkertn@umich.edu * documentation and/or other materials provided with the distribution. 134484Sbinkertn@umich.edu * 144484Sbinkertn@umich.edu * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 154484Sbinkertn@umich.edu * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 164484Sbinkertn@umich.edu * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 174484Sbinkertn@umich.edu * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 184484Sbinkertn@umich.edu * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 194484Sbinkertn@umich.edu * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 204484Sbinkertn@umich.edu * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 214484Sbinkertn@umich.edu * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 224484Sbinkertn@umich.edu * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 234484Sbinkertn@umich.edu * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 244484Sbinkertn@umich.edu * SUCH DAMAGE. 254484Sbinkertn@umich.edu */ 264484Sbinkertn@umich.edu 274484Sbinkertn@umich.edu#include <assert.h> 284484Sbinkertn@umich.edu 294484Sbinkertn@umich.edu#include "libelf.h" 304484Sbinkertn@umich.edu#include "_libelf.h" 314484Sbinkertn@umich.edu 324484Sbinkertn@umich.edu/* 334484Sbinkertn@umich.edu * Translate to/from the file representation of ELF objects. 344484Sbinkertn@umich.edu * 354484Sbinkertn@umich.edu * Translation could potentially involve the following 364484Sbinkertn@umich.edu * transformations: 374484Sbinkertn@umich.edu * 384484Sbinkertn@umich.edu * - an endianness conversion, 394484Sbinkertn@umich.edu * - a change of layout, as the file representation of ELF objects 404484Sbinkertn@umich.edu * can differ from their in-memory representation. 414484Sbinkertn@umich.edu * - a change in representation due to a layout version change. 424484Sbinkertn@umich.edu */ 434484Sbinkertn@umich.edu 444484Sbinkertn@umich.eduElf_Data * 454484Sbinkertn@umich.edu_libelf_xlate(Elf_Data *dst, const Elf_Data *src, unsigned int encoding, 464484Sbinkertn@umich.edu int elfclass, int direction) 474484Sbinkertn@umich.edu{ 484484Sbinkertn@umich.edu size_t cnt, dsz, fsz, msz; 494484Sbinkertn@umich.edu uintptr_t sb, se, db, de; 504484Sbinkertn@umich.edu 514484Sbinkertn@umich.edu if (encoding == ELFDATANONE) 524484Sbinkertn@umich.edu encoding = LIBELF_PRIVATE(byteorder); 534484Sbinkertn@umich.edu 544484Sbinkertn@umich.edu if ((encoding != ELFDATA2LSB && encoding != ELFDATA2MSB) || 554484Sbinkertn@umich.edu dst == NULL || src == NULL || dst == src) { 564484Sbinkertn@umich.edu LIBELF_SET_ERROR(ARGUMENT, 0); 574484Sbinkertn@umich.edu return (NULL); 584484Sbinkertn@umich.edu } 594484Sbinkertn@umich.edu 604484Sbinkertn@umich.edu assert(elfclass == ELFCLASS32 || elfclass == ELFCLASS64); 614484Sbinkertn@umich.edu assert(direction == ELF_TOFILE || direction == ELF_TOMEMORY); 624484Sbinkertn@umich.edu 634484Sbinkertn@umich.edu if (dst->d_version != src->d_version) { 644484Sbinkertn@umich.edu LIBELF_SET_ERROR(UNIMPL, 0); 654484Sbinkertn@umich.edu return (NULL); 664484Sbinkertn@umich.edu } 674484Sbinkertn@umich.edu 684484Sbinkertn@umich.edu if (src->d_buf == NULL || dst->d_buf == NULL || 694484Sbinkertn@umich.edu src->d_size == 0) { 704484Sbinkertn@umich.edu LIBELF_SET_ERROR(DATA, 0); 714484Sbinkertn@umich.edu return (NULL); 724484Sbinkertn@umich.edu } 734484Sbinkertn@umich.edu 744484Sbinkertn@umich.edu if ((int) src->d_type < 0 || src->d_type >= ELF_T_NUM) { 754484Sbinkertn@umich.edu LIBELF_SET_ERROR(DATA, 0); 764484Sbinkertn@umich.edu return (NULL); 774484Sbinkertn@umich.edu } 784484Sbinkertn@umich.edu 794484Sbinkertn@umich.edu if ((fsz = (elfclass == ELFCLASS32 ? elf32_fsize : elf64_fsize)(src->d_type, 804484Sbinkertn@umich.edu (size_t) 1, src->d_version)) == 0) 814484Sbinkertn@umich.edu return (NULL); 824484Sbinkertn@umich.edu 834484Sbinkertn@umich.edu msz = _libelf_msize(src->d_type, elfclass, src->d_version); 844484Sbinkertn@umich.edu 854484Sbinkertn@umich.edu assert(msz > 0); 864484Sbinkertn@umich.edu 874484Sbinkertn@umich.edu if (src->d_size % (direction == ELF_TOMEMORY ? fsz : msz)) { 884484Sbinkertn@umich.edu LIBELF_SET_ERROR(DATA, 0); 894484Sbinkertn@umich.edu return (NULL); 904484Sbinkertn@umich.edu } 914484Sbinkertn@umich.edu 924484Sbinkertn@umich.edu /* 934484Sbinkertn@umich.edu * Determine the number of objects that need to be converted, and 944484Sbinkertn@umich.edu * the space required for the converted objects in the destination 954484Sbinkertn@umich.edu * buffer. 964484Sbinkertn@umich.edu */ 974484Sbinkertn@umich.edu if (direction == ELF_TOMEMORY) { 984484Sbinkertn@umich.edu cnt = src->d_size / fsz; 994484Sbinkertn@umich.edu dsz = cnt * msz; 1004484Sbinkertn@umich.edu } else { 1014484Sbinkertn@umich.edu cnt = src->d_size / msz; 1024484Sbinkertn@umich.edu dsz = cnt * fsz; 1034484Sbinkertn@umich.edu } 1044484Sbinkertn@umich.edu 1054484Sbinkertn@umich.edu if (dst->d_size < dsz) { 1064484Sbinkertn@umich.edu LIBELF_SET_ERROR(DATA, 0); 1074484Sbinkertn@umich.edu return (NULL); 1084484Sbinkertn@umich.edu } 1094484Sbinkertn@umich.edu 1104484Sbinkertn@umich.edu sb = (uintptr_t) src->d_buf; 1114484Sbinkertn@umich.edu se = sb + src->d_size; 1124484Sbinkertn@umich.edu db = (uintptr_t) dst->d_buf; 1134484Sbinkertn@umich.edu de = db + dst->d_size; 1144484Sbinkertn@umich.edu 1154484Sbinkertn@umich.edu /* 1164484Sbinkertn@umich.edu * Check for overlapping buffers. Note that db == sb is 1174484Sbinkertn@umich.edu * allowed. 1184484Sbinkertn@umich.edu */ 1194484Sbinkertn@umich.edu if (db != sb && de > sb && se > db) { 1204484Sbinkertn@umich.edu LIBELF_SET_ERROR(DATA, 0); 1214484Sbinkertn@umich.edu return (NULL); 1224484Sbinkertn@umich.edu } 1234484Sbinkertn@umich.edu 1244484Sbinkertn@umich.edu if ((direction == ELF_TOMEMORY ? db : sb) % 1254484Sbinkertn@umich.edu _libelf_malign(src->d_type, elfclass)) { 1264484Sbinkertn@umich.edu LIBELF_SET_ERROR(DATA, 0); 1274484Sbinkertn@umich.edu return (NULL); 1284484Sbinkertn@umich.edu } 1294484Sbinkertn@umich.edu 1304484Sbinkertn@umich.edu dst->d_type = src->d_type; 1314484Sbinkertn@umich.edu dst->d_size = dsz; 1324484Sbinkertn@umich.edu 1334484Sbinkertn@umich.edu if (db == sb && encoding == LIBELF_PRIVATE(byteorder) && 1344484Sbinkertn@umich.edu fsz == msz) 1354484Sbinkertn@umich.edu return (dst); /* nothing more to do */ 1364484Sbinkertn@umich.edu 1374484Sbinkertn@umich.edu (_libelf_get_translator(src->d_type, direction, elfclass))(dst->d_buf, 1384484Sbinkertn@umich.edu src->d_buf, cnt, encoding != LIBELF_PRIVATE(byteorder)); 1394484Sbinkertn@umich.edu 1404484Sbinkertn@umich.edu return (dst); 1414484Sbinkertn@umich.edu} 142