mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-24 11:29:10 +00:00
145 lines
4.0 KiB
C
145 lines
4.0 KiB
C
/*-
|
|
* 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.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <assert.h>
|
|
#include <libelf.h>
|
|
|
|
#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_PRIVATE(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 ||
|
|
src->d_size == 0) {
|
|
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 (db == sb && encoding == LIBELF_PRIVATE(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_PRIVATE(byteorder));
|
|
|
|
return (dst);
|
|
}
|