138 lines
4.0 KiB
C
138 lines
4.0 KiB
C
/*-
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* Copyright (c) 2006 Joseph Koshy
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* 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 <assert.h>
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#include <libelf.h>
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#include "_libelf.h"
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/*
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* Translate to/from the file representation of ELF objects.
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*
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* Translation could potentially involve the following
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* transformations:
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*
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* - an endianness conversion,
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* - a change of layout, as the file representation of ELF objects
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* can differ from their in-memory representation.
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* - a change in representation due to a layout version change.
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*/
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Elf_Data *
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_libelf_xlate(Elf_Data *dst, const Elf_Data *src, unsigned int encoding,
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int elfclass, int direction)
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{
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size_t cnt, dsz, fsz, msz;
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uintptr_t sb, se, db, de;
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if (encoding == ELFDATANONE)
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encoding = LIBELF_PRIVATE(byteorder);
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if ((encoding != ELFDATA2LSB && encoding != ELFDATA2MSB) ||
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dst == NULL || src == NULL || dst == src) {
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LIBELF_SET_ERROR(ARGUMENT, 0);
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return (NULL);
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}
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assert(elfclass == ELFCLASS32 || elfclass == ELFCLASS64);
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assert(direction == ELF_TOFILE || direction == ELF_TOMEMORY);
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if (dst->d_version != src->d_version) {
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LIBELF_SET_ERROR(UNIMPL, 0);
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return (NULL);
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}
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if (src->d_buf == NULL || dst->d_buf == NULL ||
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src->d_size == 0) {
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LIBELF_SET_ERROR(DATA, 0);
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return (NULL);
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}
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if ((int) src->d_type < 0 || src->d_type >= ELF_T_NUM) {
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LIBELF_SET_ERROR(DATA, 0);
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return (NULL);
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}
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if ((fsz = (elfclass == ELFCLASS32 ? elf32_fsize : elf64_fsize)(src->d_type,
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(size_t) 1, src->d_version)) == 0)
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return (NULL);
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msz = _libelf_msize(src->d_type, elfclass, src->d_version);
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assert(msz > 0);
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if (src->d_size % (direction == ELF_TOMEMORY ? fsz : msz)) {
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LIBELF_SET_ERROR(DATA, 0);
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return (NULL);
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}
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cnt = src->d_size / msz;
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dsz = cnt * fsz;
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if (dst->d_size < dsz) {
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LIBELF_SET_ERROR(DATA, 0);
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return (NULL);
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}
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sb = (uintptr_t) src->d_buf;
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se = sb + src->d_size;
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db = (uintptr_t) dst->d_buf;
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de = db + dst->d_size;
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/*
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* Check for overlapping buffers. Note that db == sb is
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* allowed, in which case the source buffer must also be large
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* enough for `n' target objects. For file to native
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* conversions, an in-place conversion is not always possible.
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*/
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if ((db == sb && dsz < src->d_size) ||
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(db != sb && de > sb && se > db)) {
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LIBELF_SET_ERROR(DATA, 0);
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return (NULL);
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}
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if ((direction == ELF_TOMEMORY ? db : sb) %
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_libelf_malign(src->d_type, elfclass)) {
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LIBELF_SET_ERROR(DATA, 0);
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return (NULL);
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}
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dst->d_type = src->d_type;
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dst->d_size = cnt * fsz;
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if (db == sb && encoding == LIBELF_PRIVATE(byteorder) &&
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fsz == msz)
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return (dst); /* nothing more to do */
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(_libelf_get_translator(src->d_type, direction, elfclass))(dst->d_buf,
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src->d_buf, cnt, encoding != LIBELF_PRIVATE(byteorder));
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return (dst);
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}
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