125b3c049e70834cf33790a28643ab058b507b35cBen Cheng/* Convert from memory to file representation. 225b3c049e70834cf33790a28643ab058b507b35cBen Cheng Copyright (C) 1998, 1999, 2000, 2002 Red Hat, Inc. 303333823c75a1c1887e923828113a1b0fd12020cElliott Hughes This file is part of elfutils. 425b3c049e70834cf33790a28643ab058b507b35cBen Cheng Written by Ulrich Drepper <drepper@redhat.com>, 1998. 525b3c049e70834cf33790a28643ab058b507b35cBen Cheng 603333823c75a1c1887e923828113a1b0fd12020cElliott Hughes This file is free software; you can redistribute it and/or modify 703333823c75a1c1887e923828113a1b0fd12020cElliott Hughes it under the terms of either 825b3c049e70834cf33790a28643ab058b507b35cBen Cheng 903333823c75a1c1887e923828113a1b0fd12020cElliott Hughes * the GNU Lesser General Public License as published by the Free 1003333823c75a1c1887e923828113a1b0fd12020cElliott Hughes Software Foundation; either version 3 of the License, or (at 1103333823c75a1c1887e923828113a1b0fd12020cElliott Hughes your option) any later version 1203333823c75a1c1887e923828113a1b0fd12020cElliott Hughes 1303333823c75a1c1887e923828113a1b0fd12020cElliott Hughes or 1403333823c75a1c1887e923828113a1b0fd12020cElliott Hughes 1503333823c75a1c1887e923828113a1b0fd12020cElliott Hughes * the GNU General Public License as published by the Free 1603333823c75a1c1887e923828113a1b0fd12020cElliott Hughes Software Foundation; either version 2 of the License, or (at 1703333823c75a1c1887e923828113a1b0fd12020cElliott Hughes your option) any later version 1803333823c75a1c1887e923828113a1b0fd12020cElliott Hughes 1903333823c75a1c1887e923828113a1b0fd12020cElliott Hughes or both in parallel, as here. 2003333823c75a1c1887e923828113a1b0fd12020cElliott Hughes 2103333823c75a1c1887e923828113a1b0fd12020cElliott Hughes elfutils is distributed in the hope that it will be useful, but 2225b3c049e70834cf33790a28643ab058b507b35cBen Cheng WITHOUT ANY WARRANTY; without even the implied warranty of 2325b3c049e70834cf33790a28643ab058b507b35cBen Cheng MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 2425b3c049e70834cf33790a28643ab058b507b35cBen Cheng General Public License for more details. 2525b3c049e70834cf33790a28643ab058b507b35cBen Cheng 2603333823c75a1c1887e923828113a1b0fd12020cElliott Hughes You should have received copies of the GNU General Public License and 2703333823c75a1c1887e923828113a1b0fd12020cElliott Hughes the GNU Lesser General Public License along with this program. If 2803333823c75a1c1887e923828113a1b0fd12020cElliott Hughes not, see <http://www.gnu.org/licenses/>. */ 2925b3c049e70834cf33790a28643ab058b507b35cBen Cheng 3025b3c049e70834cf33790a28643ab058b507b35cBen Cheng#ifdef HAVE_CONFIG_H 3125b3c049e70834cf33790a28643ab058b507b35cBen Cheng# include <config.h> 3225b3c049e70834cf33790a28643ab058b507b35cBen Cheng#endif 3325b3c049e70834cf33790a28643ab058b507b35cBen Cheng 3425b3c049e70834cf33790a28643ab058b507b35cBen Cheng#include <assert.h> 3525b3c049e70834cf33790a28643ab058b507b35cBen Cheng#include <endian.h> 3625b3c049e70834cf33790a28643ab058b507b35cBen Cheng#include <string.h> 3725b3c049e70834cf33790a28643ab058b507b35cBen Cheng 3825b3c049e70834cf33790a28643ab058b507b35cBen Cheng#include "libelfP.h" 3925b3c049e70834cf33790a28643ab058b507b35cBen Cheng 4025b3c049e70834cf33790a28643ab058b507b35cBen Cheng#ifndef LIBELFBITS 4125b3c049e70834cf33790a28643ab058b507b35cBen Cheng# define LIBELFBITS 32 4225b3c049e70834cf33790a28643ab058b507b35cBen Cheng#endif 4325b3c049e70834cf33790a28643ab058b507b35cBen Cheng 4425b3c049e70834cf33790a28643ab058b507b35cBen Cheng 4525b3c049e70834cf33790a28643ab058b507b35cBen ChengElf_Data * 4625b3c049e70834cf33790a28643ab058b507b35cBen Chengelfw2(LIBELFBITS, xlatetof) (dest, src, encode) 4725b3c049e70834cf33790a28643ab058b507b35cBen Cheng Elf_Data *dest; 4825b3c049e70834cf33790a28643ab058b507b35cBen Cheng const Elf_Data *src; 4925b3c049e70834cf33790a28643ab058b507b35cBen Cheng unsigned int encode; 5025b3c049e70834cf33790a28643ab058b507b35cBen Cheng{ 5125b3c049e70834cf33790a28643ab058b507b35cBen Cheng /* First test whether the input data is really suitable for this 5225b3c049e70834cf33790a28643ab058b507b35cBen Cheng type. This means, whether there is an integer number of records. 5325b3c049e70834cf33790a28643ab058b507b35cBen Cheng Note that for this implementation the memory and file size of the 5425b3c049e70834cf33790a28643ab058b507b35cBen Cheng data types are identical. */ 5525b3c049e70834cf33790a28643ab058b507b35cBen Cheng#if EV_NUM != 2 5625b3c049e70834cf33790a28643ab058b507b35cBen Cheng size_t recsize = __libelf_type_sizes[src->d_version - 1][ELFW(ELFCLASS,LIBELFBITS) - 1][src->d_type]; 5725b3c049e70834cf33790a28643ab058b507b35cBen Cheng#else 5825b3c049e70834cf33790a28643ab058b507b35cBen Cheng size_t recsize = __libelf_type_sizes[0][ELFW(ELFCLASS,LIBELFBITS) - 1][src->d_type]; 5925b3c049e70834cf33790a28643ab058b507b35cBen Cheng#endif 6025b3c049e70834cf33790a28643ab058b507b35cBen Cheng 6125b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (src->d_size % recsize != 0) 6225b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 6325b3c049e70834cf33790a28643ab058b507b35cBen Cheng __libelf_seterrno (ELF_E_INVALID_DATA); 6425b3c049e70834cf33790a28643ab058b507b35cBen Cheng return NULL; 6525b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 6625b3c049e70834cf33790a28643ab058b507b35cBen Cheng 6725b3c049e70834cf33790a28643ab058b507b35cBen Cheng /* Next see whether the converted data fits in the output buffer. */ 6825b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (src->d_size > dest->d_size) 6925b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 7025b3c049e70834cf33790a28643ab058b507b35cBen Cheng __libelf_seterrno (ELF_E_DEST_SIZE); 7125b3c049e70834cf33790a28643ab058b507b35cBen Cheng return NULL; 7225b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 7325b3c049e70834cf33790a28643ab058b507b35cBen Cheng 7425b3c049e70834cf33790a28643ab058b507b35cBen Cheng /* Test the encode parameter. */ 7525b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (encode != ELFDATA2LSB && encode != ELFDATA2MSB) 7625b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 7725b3c049e70834cf33790a28643ab058b507b35cBen Cheng __libelf_seterrno (ELF_E_INVALID_ENCODING); 7825b3c049e70834cf33790a28643ab058b507b35cBen Cheng return NULL; 7925b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 8025b3c049e70834cf33790a28643ab058b507b35cBen Cheng 8125b3c049e70834cf33790a28643ab058b507b35cBen Cheng /* Determine the translation function to use. 8225b3c049e70834cf33790a28643ab058b507b35cBen Cheng 8325b3c049e70834cf33790a28643ab058b507b35cBen Cheng At this point we make an assumption which is valid for all 8425b3c049e70834cf33790a28643ab058b507b35cBen Cheng existing implementations so far: the memory and file sizes are 8525b3c049e70834cf33790a28643ab058b507b35cBen Cheng the same. This has very important consequences: 8625b3c049e70834cf33790a28643ab058b507b35cBen Cheng a) The requirement that the source and destination buffer can 8725b3c049e70834cf33790a28643ab058b507b35cBen Cheng overlap can easily be fulfilled. 8825b3c049e70834cf33790a28643ab058b507b35cBen Cheng b) We need only one function to convert from and memory to file 8925b3c049e70834cf33790a28643ab058b507b35cBen Cheng and vice versa since the function only has to copy and/or 9025b3c049e70834cf33790a28643ab058b507b35cBen Cheng change the byte order. 9125b3c049e70834cf33790a28643ab058b507b35cBen Cheng */ 9225b3c049e70834cf33790a28643ab058b507b35cBen Cheng if ((__BYTE_ORDER == __LITTLE_ENDIAN && encode == ELFDATA2LSB) 9325b3c049e70834cf33790a28643ab058b507b35cBen Cheng || (__BYTE_ORDER == __BIG_ENDIAN && encode == ELFDATA2MSB)) 9425b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 9525b3c049e70834cf33790a28643ab058b507b35cBen Cheng /* We simply have to copy since the byte order is the same. */ 9625b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (src->d_buf != dest->d_buf) 9725b3c049e70834cf33790a28643ab058b507b35cBen Cheng memmove (dest->d_buf, src->d_buf, src->d_size); 9825b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 9925b3c049e70834cf33790a28643ab058b507b35cBen Cheng else 10025b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 10125b3c049e70834cf33790a28643ab058b507b35cBen Cheng xfct_t fctp; 10225b3c049e70834cf33790a28643ab058b507b35cBen Cheng 10325b3c049e70834cf33790a28643ab058b507b35cBen Cheng /* Get a pointer to the transformation functions. The `#ifdef' is 10425b3c049e70834cf33790a28643ab058b507b35cBen Cheng a small optimization since we don't anticipate another ELF 10525b3c049e70834cf33790a28643ab058b507b35cBen Cheng version and so would waste "precious" code. */ 10625b3c049e70834cf33790a28643ab058b507b35cBen Cheng#if EV_NUM != 2 10725b3c049e70834cf33790a28643ab058b507b35cBen Cheng fctp = __elf_xfctstom[dest->d_version - 1][src->d_version - 1][ELFW(ELFCLASS, LIBELFBITS) - 1][src->d_type]; 10825b3c049e70834cf33790a28643ab058b507b35cBen Cheng#else 10925b3c049e70834cf33790a28643ab058b507b35cBen Cheng fctp = __elf_xfctstom[0][0][ELFW(ELFCLASS, LIBELFBITS) - 1][src->d_type]; 11025b3c049e70834cf33790a28643ab058b507b35cBen Cheng#endif 11125b3c049e70834cf33790a28643ab058b507b35cBen Cheng 11225b3c049e70834cf33790a28643ab058b507b35cBen Cheng /* Do the real work. */ 11325b3c049e70834cf33790a28643ab058b507b35cBen Cheng (*fctp) (dest->d_buf, src->d_buf, src->d_size, 1); 11425b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 11525b3c049e70834cf33790a28643ab058b507b35cBen Cheng 11625b3c049e70834cf33790a28643ab058b507b35cBen Cheng /* Now set the real destination type and length since the operation was 11725b3c049e70834cf33790a28643ab058b507b35cBen Cheng successful. */ 11825b3c049e70834cf33790a28643ab058b507b35cBen Cheng dest->d_type = src->d_type; 11925b3c049e70834cf33790a28643ab058b507b35cBen Cheng dest->d_size = src->d_size; 12025b3c049e70834cf33790a28643ab058b507b35cBen Cheng 12125b3c049e70834cf33790a28643ab058b507b35cBen Cheng return dest; 12225b3c049e70834cf33790a28643ab058b507b35cBen Cheng} 12325b3c049e70834cf33790a28643ab058b507b35cBen ChengINTDEF(elfw2(LIBELFBITS, xlatetof)) 124