125b3c049e70834cf33790a28643ab058b507b35cBen Cheng/* Common definitions for handling files in memory or only on disk. 225b3c049e70834cf33790a28643ab058b507b35cBen Cheng Copyright (C) 1998, 1999, 2000, 2002, 2005, 2008 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#ifndef _COMMON_H 3125b3c049e70834cf33790a28643ab058b507b35cBen Cheng#define _COMMON_H 1 3225b3c049e70834cf33790a28643ab058b507b35cBen Cheng 3325b3c049e70834cf33790a28643ab058b507b35cBen Cheng#include <ar.h> 3425b3c049e70834cf33790a28643ab058b507b35cBen Cheng#include <byteswap.h> 3525b3c049e70834cf33790a28643ab058b507b35cBen Cheng#include <endian.h> 3625b3c049e70834cf33790a28643ab058b507b35cBen Cheng#include <stdlib.h> 3725b3c049e70834cf33790a28643ab058b507b35cBen Cheng#include <string.h> 3825b3c049e70834cf33790a28643ab058b507b35cBen Cheng 3925b3c049e70834cf33790a28643ab058b507b35cBen Cheng#include "libelfP.h" 4025b3c049e70834cf33790a28643ab058b507b35cBen Cheng 4125b3c049e70834cf33790a28643ab058b507b35cBen Chengstatic inline Elf_Kind 4225b3c049e70834cf33790a28643ab058b507b35cBen Cheng__attribute__ ((unused)) 4325b3c049e70834cf33790a28643ab058b507b35cBen Chengdetermine_kind (void *buf, size_t len) 4425b3c049e70834cf33790a28643ab058b507b35cBen Cheng{ 4525b3c049e70834cf33790a28643ab058b507b35cBen Cheng /* First test for an archive. */ 4625b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (len >= SARMAG && memcmp (buf, ARMAG, SARMAG) == 0) 4725b3c049e70834cf33790a28643ab058b507b35cBen Cheng return ELF_K_AR; 4825b3c049e70834cf33790a28643ab058b507b35cBen Cheng 4925b3c049e70834cf33790a28643ab058b507b35cBen Cheng /* Next try ELF files. */ 5025b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (len >= EI_NIDENT && memcmp (buf, ELFMAG, SELFMAG) == 0) 5125b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 5225b3c049e70834cf33790a28643ab058b507b35cBen Cheng /* Could be an ELF file. */ 5325b3c049e70834cf33790a28643ab058b507b35cBen Cheng int eclass = (int) ((unsigned char *) buf)[EI_CLASS]; 5425b3c049e70834cf33790a28643ab058b507b35cBen Cheng int data = (int) ((unsigned char *) buf)[EI_DATA]; 5525b3c049e70834cf33790a28643ab058b507b35cBen Cheng int version = (int) ((unsigned char *) buf)[EI_VERSION]; 5625b3c049e70834cf33790a28643ab058b507b35cBen Cheng 5725b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (eclass > ELFCLASSNONE && eclass < ELFCLASSNUM 5825b3c049e70834cf33790a28643ab058b507b35cBen Cheng && data > ELFDATANONE && data < ELFDATANUM 5925b3c049e70834cf33790a28643ab058b507b35cBen Cheng && version > EV_NONE && version < EV_NUM) 6025b3c049e70834cf33790a28643ab058b507b35cBen Cheng return ELF_K_ELF; 6125b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 6225b3c049e70834cf33790a28643ab058b507b35cBen Cheng 6325b3c049e70834cf33790a28643ab058b507b35cBen Cheng /* We do not know this file type. */ 6425b3c049e70834cf33790a28643ab058b507b35cBen Cheng return ELF_K_NONE; 6525b3c049e70834cf33790a28643ab058b507b35cBen Cheng} 6625b3c049e70834cf33790a28643ab058b507b35cBen Cheng 6725b3c049e70834cf33790a28643ab058b507b35cBen Cheng 6825b3c049e70834cf33790a28643ab058b507b35cBen Cheng/* Allocate an Elf descriptor and fill in the generic information. */ 6925b3c049e70834cf33790a28643ab058b507b35cBen Chengstatic inline Elf * 7025b3c049e70834cf33790a28643ab058b507b35cBen Cheng__attribute__ ((unused)) 7125b3c049e70834cf33790a28643ab058b507b35cBen Chengallocate_elf (int fildes, void *map_address, off_t offset, size_t maxsize, 7225b3c049e70834cf33790a28643ab058b507b35cBen Cheng Elf_Cmd cmd, Elf *parent, Elf_Kind kind, size_t extra) 7325b3c049e70834cf33790a28643ab058b507b35cBen Cheng{ 7425b3c049e70834cf33790a28643ab058b507b35cBen Cheng Elf *result = (Elf *) calloc (1, sizeof (Elf) + extra); 7525b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (result == NULL) 7625b3c049e70834cf33790a28643ab058b507b35cBen Cheng __libelf_seterrno (ELF_E_NOMEM); 7725b3c049e70834cf33790a28643ab058b507b35cBen Cheng else 7825b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 7925b3c049e70834cf33790a28643ab058b507b35cBen Cheng result->kind = kind; 8025b3c049e70834cf33790a28643ab058b507b35cBen Cheng result->ref_count = 1; 8125b3c049e70834cf33790a28643ab058b507b35cBen Cheng result->cmd = cmd; 8225b3c049e70834cf33790a28643ab058b507b35cBen Cheng result->fildes = fildes; 8325b3c049e70834cf33790a28643ab058b507b35cBen Cheng result->start_offset = offset; 8425b3c049e70834cf33790a28643ab058b507b35cBen Cheng result->maximum_size = maxsize; 8525b3c049e70834cf33790a28643ab058b507b35cBen Cheng result->map_address = map_address; 8625b3c049e70834cf33790a28643ab058b507b35cBen Cheng result->parent = parent; 8725b3c049e70834cf33790a28643ab058b507b35cBen Cheng 8825b3c049e70834cf33790a28643ab058b507b35cBen Cheng rwlock_init (result->lock); 8925b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 9025b3c049e70834cf33790a28643ab058b507b35cBen Cheng 9125b3c049e70834cf33790a28643ab058b507b35cBen Cheng return result; 9225b3c049e70834cf33790a28643ab058b507b35cBen Cheng} 9325b3c049e70834cf33790a28643ab058b507b35cBen Cheng 9425b3c049e70834cf33790a28643ab058b507b35cBen Cheng 9525b3c049e70834cf33790a28643ab058b507b35cBen Cheng/* Acquire lock for the descriptor and all children. */ 9625b3c049e70834cf33790a28643ab058b507b35cBen Chengstatic void 9725b3c049e70834cf33790a28643ab058b507b35cBen Cheng__attribute__ ((unused)) 9825b3c049e70834cf33790a28643ab058b507b35cBen Chenglibelf_acquire_all (Elf *elf) 9925b3c049e70834cf33790a28643ab058b507b35cBen Cheng{ 10025b3c049e70834cf33790a28643ab058b507b35cBen Cheng rwlock_wrlock (elf->lock); 10125b3c049e70834cf33790a28643ab058b507b35cBen Cheng 10225b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (elf->kind == ELF_K_AR) 10325b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 10425b3c049e70834cf33790a28643ab058b507b35cBen Cheng Elf *child = elf->state.ar.children; 10525b3c049e70834cf33790a28643ab058b507b35cBen Cheng 10625b3c049e70834cf33790a28643ab058b507b35cBen Cheng while (child != NULL) 10725b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 10825b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (child->ref_count != 0) 10925b3c049e70834cf33790a28643ab058b507b35cBen Cheng libelf_acquire_all (child); 11025b3c049e70834cf33790a28643ab058b507b35cBen Cheng child = child->next; 11125b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 11225b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 11325b3c049e70834cf33790a28643ab058b507b35cBen Cheng} 11425b3c049e70834cf33790a28643ab058b507b35cBen Cheng 11525b3c049e70834cf33790a28643ab058b507b35cBen Cheng/* Release own lock and those of the children. */ 11625b3c049e70834cf33790a28643ab058b507b35cBen Chengstatic void 11725b3c049e70834cf33790a28643ab058b507b35cBen Cheng__attribute__ ((unused)) 11825b3c049e70834cf33790a28643ab058b507b35cBen Chenglibelf_release_all (Elf *elf) 11925b3c049e70834cf33790a28643ab058b507b35cBen Cheng{ 12025b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (elf->kind == ELF_K_AR) 12125b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 12225b3c049e70834cf33790a28643ab058b507b35cBen Cheng Elf *child = elf->state.ar.children; 12325b3c049e70834cf33790a28643ab058b507b35cBen Cheng 12425b3c049e70834cf33790a28643ab058b507b35cBen Cheng while (child != NULL) 12525b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 12625b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (child->ref_count != 0) 12725b3c049e70834cf33790a28643ab058b507b35cBen Cheng libelf_release_all (child); 12825b3c049e70834cf33790a28643ab058b507b35cBen Cheng child = child->next; 12925b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 13025b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 13125b3c049e70834cf33790a28643ab058b507b35cBen Cheng 13225b3c049e70834cf33790a28643ab058b507b35cBen Cheng rwlock_unlock (elf->lock); 13325b3c049e70834cf33790a28643ab058b507b35cBen Cheng} 13425b3c049e70834cf33790a28643ab058b507b35cBen Cheng 13525b3c049e70834cf33790a28643ab058b507b35cBen Cheng 13625b3c049e70834cf33790a28643ab058b507b35cBen Cheng/* Macro to convert endianess in place. It determines the function it 13725b3c049e70834cf33790a28643ab058b507b35cBen Cheng has to use itself. */ 13825b3c049e70834cf33790a28643ab058b507b35cBen Cheng#define CONVERT(Var) \ 13925b3c049e70834cf33790a28643ab058b507b35cBen Cheng (Var) = (sizeof (Var) == 1 \ 14025b3c049e70834cf33790a28643ab058b507b35cBen Cheng ? (unsigned char) (Var) \ 14125b3c049e70834cf33790a28643ab058b507b35cBen Cheng : (sizeof (Var) == 2 \ 14225b3c049e70834cf33790a28643ab058b507b35cBen Cheng ? bswap_16 (Var) \ 14325b3c049e70834cf33790a28643ab058b507b35cBen Cheng : (sizeof (Var) == 4 \ 14425b3c049e70834cf33790a28643ab058b507b35cBen Cheng ? bswap_32 (Var) \ 14525b3c049e70834cf33790a28643ab058b507b35cBen Cheng : bswap_64 (Var)))) 14625b3c049e70834cf33790a28643ab058b507b35cBen Cheng 14725b3c049e70834cf33790a28643ab058b507b35cBen Cheng#define CONVERT_TO(Dst, Var) \ 14825b3c049e70834cf33790a28643ab058b507b35cBen Cheng (Dst) = (sizeof (Var) == 1 \ 14925b3c049e70834cf33790a28643ab058b507b35cBen Cheng ? (unsigned char) (Var) \ 15025b3c049e70834cf33790a28643ab058b507b35cBen Cheng : (sizeof (Var) == 2 \ 15125b3c049e70834cf33790a28643ab058b507b35cBen Cheng ? bswap_16 (Var) \ 15225b3c049e70834cf33790a28643ab058b507b35cBen Cheng : (sizeof (Var) == 4 \ 15325b3c049e70834cf33790a28643ab058b507b35cBen Cheng ? bswap_32 (Var) \ 15425b3c049e70834cf33790a28643ab058b507b35cBen Cheng : bswap_64 (Var)))) 15525b3c049e70834cf33790a28643ab058b507b35cBen Cheng 15625b3c049e70834cf33790a28643ab058b507b35cBen Cheng 15725b3c049e70834cf33790a28643ab058b507b35cBen Cheng#if __BYTE_ORDER == __LITTLE_ENDIAN 15825b3c049e70834cf33790a28643ab058b507b35cBen Cheng# define MY_ELFDATA ELFDATA2LSB 15925b3c049e70834cf33790a28643ab058b507b35cBen Cheng#else 16025b3c049e70834cf33790a28643ab058b507b35cBen Cheng# define MY_ELFDATA ELFDATA2MSB 16125b3c049e70834cf33790a28643ab058b507b35cBen Cheng#endif 16225b3c049e70834cf33790a28643ab058b507b35cBen Cheng 16325b3c049e70834cf33790a28643ab058b507b35cBen Cheng#endif /* common.h */ 164