diff options
Diffstat (limited to 'libelf/elf32_xlatetom.c')
| -rw-r--r-- | libelf/elf32_xlatetom.c | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/libelf/elf32_xlatetom.c b/libelf/elf32_xlatetom.c new file mode 100644 index 0000000..4f54df2 --- /dev/null +++ b/libelf/elf32_xlatetom.c @@ -0,0 +1,145 @@ +/* Convert from file to memory representation. + Copyright (C) 1998, 1999, 2000, 2002 Red Hat, Inc. + This file is part of Red Hat elfutils. + Written by Ulrich Drepper <drepper@redhat.com>, 1998. + + Red Hat elfutils is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by the + Free Software Foundation; version 2 of the License. + + Red Hat elfutils is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + General Public License for more details. + + You should have received a copy of the GNU General Public License along + with Red Hat elfutils; if not, write to the Free Software Foundation, + Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA. + + In addition, as a special exception, Red Hat, Inc. gives You the + additional right to link the code of Red Hat elfutils with code licensed + under any Open Source Initiative certified open source license + (http://www.opensource.org/licenses/index.php) which requires the + distribution of source code with any binary distribution and to + distribute linked combinations of the two. Non-GPL Code permitted under + this exception must only link to the code of Red Hat elfutils through + those well defined interfaces identified in the file named EXCEPTION + found in the source code files (the "Approved Interfaces"). The files + of Non-GPL Code may instantiate templates or use macros or inline + functions from the Approved Interfaces without causing the resulting + work to be covered by the GNU General Public License. Only Red Hat, + Inc. may make changes or additions to the list of Approved Interfaces. + Red Hat's grant of this exception is conditioned upon your not adding + any new exceptions. If you wish to add a new Approved Interface or + exception, please contact Red Hat. You must obey the GNU General Public + License in all respects for all of the Red Hat elfutils code and other + code used in conjunction with Red Hat elfutils except the Non-GPL Code + covered by this exception. If you modify this file, you may extend this + exception to your version of the file, but you are not obligated to do + so. If you do not wish to provide this exception without modification, + you must delete this exception statement from your version and license + this file solely under the GPL without exception. + + Red Hat elfutils is an included package of the Open Invention Network. + An included package of the Open Invention Network is a package for which + Open Invention Network licensees cross-license their patents. No patent + license is granted, either expressly or impliedly, by designation as an + included package. Should you wish to participate in the Open Invention + Network licensing program, please visit www.openinventionnetwork.com + <http://www.openinventionnetwork.com>. */ + +#ifdef HAVE_CONFIG_H +# include <config.h> +#endif + +#include <assert.h> +#include <endian.h> +#include <string.h> + +#include "libelfP.h" + +#ifndef LIBELFBITS +# define LIBELFBITS 32 +#endif + + +Elf_Data * +elfw2(LIBELFBITS, xlatetom) (dest, src, encode) + Elf_Data *dest; + const Elf_Data *src; + unsigned int encode; +{ + /* First test whether the input data is really suitable for this + type. This means, whether there is an integer number of records. + Note that for this implementation the memory and file size of the + data types are identical. */ +#if EV_NUM != 2 + size_t recsize = __libelf_type_sizes[src->d_version - 1][ELFW(ELFCLASS,LIBELFBITS) - 1][src->d_type]; +#else + size_t recsize = __libelf_type_sizes[0][ELFW(ELFCLASS,LIBELFBITS) - 1][src->d_type]; +#endif + + + if (src->d_size % recsize != 0) + { + __libelf_seterrno (ELF_E_INVALID_DATA); + return NULL; + } + + /* Next see whether the converted data fits in the output buffer. */ + if (src->d_size > dest->d_size) + { + __libelf_seterrno (ELF_E_DEST_SIZE); + return NULL; + } + + /* Test the encode parameter. */ + if (encode != ELFDATA2LSB && encode != ELFDATA2MSB) + { + __libelf_seterrno (ELF_E_INVALID_ENCODING); + return NULL; + } + + /* Determine the translation function to use. + + At this point we make an assumption which is valid for all + existing implementations so far: the memory and file sizes are + the same. This has very important consequences: + a) The requirement that the source and destination buffer can + overlap can easily be fulfilled. + b) We need only one function to convert from and memory to file + and vice versa since the function only has to copy and/or + change the byte order. + */ + if ((BYTE_ORDER == LITTLE_ENDIAN && encode == ELFDATA2LSB) + || (BYTE_ORDER == BIG_ENDIAN && encode == ELFDATA2MSB)) + { + /* We simply have to copy since the byte order is the same. */ + if (src->d_buf != dest->d_buf) + memmove (dest->d_buf, src->d_buf, src->d_size); + } + else + { + xfct_t fctp; + + /* Get a pointer to the transformation functions. The `#ifdef' is + a small optimization since we don't anticipate another ELF + version and so would waste "precious" code. */ +#if EV_NUM != 2 + fctp = __elf_xfctstom[src->d_version - 1][dest->d_version - 1][ELFW(ELFCLASS, LIBELFBITS) - 1][src->d_type]; +#else + fctp = __elf_xfctstom[0][0][ELFW(ELFCLASS, LIBELFBITS) - 1][src->d_type]; +#endif + + /* Do the real work. */ + (*fctp) (dest->d_buf, src->d_buf, src->d_size, 0); + } + + /* Now set the real destination type and length since the operation was + successful. */ + dest->d_type = src->d_type; + dest->d_size = src->d_size; + + return dest; +} +INTDEF(elfw2(LIBELFBITS, xlatetom)) |