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164 lines
4.2 KiB
164 lines
4.2 KiB
/* Common definitions for handling files in memory or only on disk.
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Copyright (C) 1998, 1999, 2000, 2002, 2005, 2008 Red Hat, Inc.
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This file is part of elfutils.
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Written by Ulrich Drepper <drepper@redhat.com>, 1998.
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This file is free software; you can redistribute it and/or modify
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it under the terms of either
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* the GNU Lesser General Public License as published by the Free
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Software Foundation; either version 3 of the License, or (at
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your option) any later version
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or
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* the GNU General Public License as published by the Free
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Software Foundation; either version 2 of the License, or (at
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your option) any later version
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or both in parallel, as here.
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elfutils is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received copies of the GNU General Public License and
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the GNU Lesser General Public License along with this program. If
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not, see <http://www.gnu.org/licenses/>. */
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#ifndef _COMMON_H
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#define _COMMON_H 1
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#include <ar.h>
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#include <byteswap.h>
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#include <endian.h>
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#include <stdlib.h>
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#include <string.h>
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#include "libelfP.h"
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static inline Elf_Kind
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__attribute__ ((unused))
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determine_kind (void *buf, size_t len)
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{
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/* First test for an archive. */
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if (len >= SARMAG && memcmp (buf, ARMAG, SARMAG) == 0)
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return ELF_K_AR;
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/* Next try ELF files. */
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if (len >= EI_NIDENT && memcmp (buf, ELFMAG, SELFMAG) == 0)
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{
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/* Could be an ELF file. */
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int eclass = (int) ((unsigned char *) buf)[EI_CLASS];
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int data = (int) ((unsigned char *) buf)[EI_DATA];
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int version = (int) ((unsigned char *) buf)[EI_VERSION];
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if (eclass > ELFCLASSNONE && eclass < ELFCLASSNUM
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&& data > ELFDATANONE && data < ELFDATANUM
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&& version == EV_CURRENT)
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return ELF_K_ELF;
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}
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/* We do not know this file type. */
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return ELF_K_NONE;
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}
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/* Allocate an Elf descriptor and fill in the generic information. */
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static inline Elf *
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__attribute__ ((unused))
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allocate_elf (int fildes, void *map_address, int64_t offset, size_t maxsize,
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Elf_Cmd cmd, Elf *parent, Elf_Kind kind, size_t extra)
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{
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Elf *result = (Elf *) calloc (1, sizeof (Elf) + extra);
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if (result == NULL)
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__libelf_seterrno (ELF_E_NOMEM);
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else
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{
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result->kind = kind;
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result->ref_count = 1;
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result->cmd = cmd;
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result->fildes = fildes;
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result->start_offset = offset;
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result->maximum_size = maxsize;
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result->map_address = map_address;
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result->parent = parent;
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rwlock_init (result->lock);
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}
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return result;
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}
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/* Acquire lock for the descriptor and all children. */
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static void
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__attribute__ ((unused))
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libelf_acquire_all (Elf *elf)
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{
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rwlock_wrlock (elf->lock);
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if (elf->kind == ELF_K_AR)
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{
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Elf *child = elf->state.ar.children;
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while (child != NULL)
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{
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if (child->ref_count != 0)
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libelf_acquire_all (child);
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child = child->next;
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}
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}
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}
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/* Release own lock and those of the children. */
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static void
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__attribute__ ((unused))
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libelf_release_all (Elf *elf)
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{
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if (elf->kind == ELF_K_AR)
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{
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Elf *child = elf->state.ar.children;
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while (child != NULL)
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{
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if (child->ref_count != 0)
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libelf_release_all (child);
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child = child->next;
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}
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}
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rwlock_unlock (elf->lock);
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}
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/* Macro to convert endianness in place. It determines the function it
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has to use itself. */
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#define CONVERT(Var) \
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(Var) = (sizeof (Var) == 1 \
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? (unsigned char) (Var) \
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: (sizeof (Var) == 2 \
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? bswap_16 (Var) \
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: (sizeof (Var) == 4 \
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? bswap_32 (Var) \
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: bswap_64 (Var))))
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#define CONVERT_TO(Dst, Var) \
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(Dst) = (sizeof (Var) == 1 \
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? (unsigned char) (Var) \
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: (sizeof (Var) == 2 \
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? bswap_16 (Var) \
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: (sizeof (Var) == 4 \
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? bswap_32 (Var) \
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: bswap_64 (Var))))
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#if __BYTE_ORDER == __LITTLE_ENDIAN
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# define MY_ELFDATA ELFDATA2LSB
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#else
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# define MY_ELFDATA ELFDATA2MSB
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#endif
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#endif /* common.h */
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