/* Common definitions for handling files in memory or only on disk. Copyright (C) 1998, 1999, 2000, 2002, 2005, 2008 Red Hat, Inc. This file is part of Red Hat elfutils. Written by Ulrich Drepper , 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 . */ #ifndef _COMMON_H #define _COMMON_H 1 #include #include #include #include #include #include "libelfP.h" static inline Elf_Kind __attribute__ ((unused)) determine_kind (void *buf, size_t len) { /* First test for an archive. */ if (len >= SARMAG && memcmp (buf, ARMAG, SARMAG) == 0) return ELF_K_AR; /* Next try ELF files. */ if (len >= EI_NIDENT && memcmp (buf, ELFMAG, SELFMAG) == 0) { /* Could be an ELF file. */ int eclass = (int) ((unsigned char *) buf)[EI_CLASS]; int data = (int) ((unsigned char *) buf)[EI_DATA]; int version = (int) ((unsigned char *) buf)[EI_VERSION]; if (eclass > ELFCLASSNONE && eclass < ELFCLASSNUM && data > ELFDATANONE && data < ELFDATANUM && version > EV_NONE && version < EV_NUM) return ELF_K_ELF; } /* We do not know this file type. */ return ELF_K_NONE; } /* Allocate an Elf descriptor and fill in the generic information. */ static inline Elf * __attribute__ ((unused)) allocate_elf (int fildes, void *map_address, off_t offset, size_t maxsize, Elf_Cmd cmd, Elf *parent, Elf_Kind kind, size_t extra) { Elf *result = (Elf *) calloc (1, sizeof (Elf) + extra); if (result == NULL) __libelf_seterrno (ELF_E_NOMEM); else { result->kind = kind; result->ref_count = 1; result->cmd = cmd; result->fildes = fildes; result->start_offset = offset; result->maximum_size = maxsize; result->map_address = map_address; result->parent = parent; rwlock_init (result->lock); } return result; } /* Acquire lock for the descriptor and all children. */ static void __attribute__ ((unused)) libelf_acquire_all (Elf *elf) { rwlock_wrlock (elf->lock); if (elf->kind == ELF_K_AR) { Elf *child = elf->state.ar.children; while (child != NULL) { if (child->ref_count != 0) libelf_acquire_all (child); child = child->next; } } } /* Release own lock and those of the children. */ static void __attribute__ ((unused)) libelf_release_all (Elf *elf) { if (elf->kind == ELF_K_AR) { Elf *child = elf->state.ar.children; while (child != NULL) { if (child->ref_count != 0) libelf_release_all (child); child = child->next; } } rwlock_unlock (elf->lock); } /* Macro to convert endianess in place. It determines the function it has to use itself. */ #define CONVERT(Var) \ (Var) = (sizeof (Var) == 1 \ ? (unsigned char) (Var) \ : (sizeof (Var) == 2 \ ? bswap_16 (Var) \ : (sizeof (Var) == 4 \ ? bswap_32 (Var) \ : bswap_64 (Var)))) #define CONVERT_TO(Dst, Var) \ (Dst) = (sizeof (Var) == 1 \ ? (unsigned char) (Var) \ : (sizeof (Var) == 2 \ ? bswap_16 (Var) \ : (sizeof (Var) == 4 \ ? bswap_32 (Var) \ : bswap_64 (Var)))) #if __BYTE_ORDER == __LITTLE_ENDIAN # define MY_ELFDATA ELFDATA2LSB #else # define MY_ELFDATA ELFDATA2MSB #endif #endif /* common.h */