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Diffstat (limited to 'libelf/common.h')
| -rw-r--r-- | libelf/common.h | 184 |
1 files changed, 184 insertions, 0 deletions
diff --git a/libelf/common.h b/libelf/common.h new file mode 100644 index 0000000..8eef2a7 --- /dev/null +++ b/libelf/common.h @@ -0,0 +1,184 @@ +/* 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 <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>. */ + +#ifndef _COMMON_H +#define _COMMON_H 1 + +#include <ar.h> +#include <byteswap.h> +#include <endian.h> +#include <stdlib.h> +#include <string.h> + +#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 */ |