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/*******************************************************************************
* Copyright (c) 2007 Wind River Systems, Inc. and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Wind River Systems - initial API and implementation
*******************************************************************************/
/*
* This module implements reading and caching of ELF files.
*/
#ifndef D_elf
#define D_elf
#include <sys/types.h>
#if defined(WIN32)
#else
# include <elf.h>
#endif
#include "mdep.h"
typedef unsigned char U1_T;
typedef signed char I1_T;
typedef unsigned short U2_T;
typedef signed short I2_T;
typedef unsigned int U4_T;
typedef signed int I4_T;
typedef uns64 U8_T;
typedef int64 I8_T;
struct ELF_File;
struct ELF_Section;
typedef struct ELF_Section ELF_Section;
typedef struct ELF_File ELF_File;
struct ELF_File {
ELF_File * next;
U4_T ref_cnt;
char * name;
dev_t dev;
ino_t ino;
time_t mtime;
int fd;
int big_endian;
U4_T section_cnt;
ELF_Section ** sections;
void * libelf_cache;
void * dwarf_cache;
void * sym_cache;
void * line_numbers_cache;
};
struct ELF_Section {
ELF_File * file;
U4_T index;
char * name;
U4_T type;
U4_T flags;
U8_T offset;
U8_T size;
U8_T addr;
U4_T link;
U4_T info;
};
/*
* Open ELF file for reading.
* Same file can be opened mutiple times, each call to elf_open() increases reference counter.
* File must be closed after usage by calling elf_close().
* Returns the file descriptior on success. If error, returns NULL and sets errno.
*/
extern ELF_File * elf_open(char * file_name);
/*
* Read section data from ELF file.
* '*rd_len' is set to number of bytes transfered into the buffer.
* Returns zero on success. If error, returns -1 and sets errno.
*/
extern int elf_read(ELF_Section * section, U8_T offset, U1_T * buf, U4_T size, U4_T * rd_len);
/*
* Load section data into memory.
* '*address' is set to section data address in memory.
* Data will stay in memory at least until file is closed.
* Returns zero on success. If error, returns -1 and sets errno.
*/
extern int elf_load(ELF_Section * section, U1_T ** address);
/*
* Close ELF file.
* Each call of elf_close() decrements reference counter.
* The file be kept in cache for some time even after all references are closed.
*/
extern void elf_close(ELF_File * file);
/*
* Register ELF file close callback.
* The callback is called each time an ELF file data is about to be disposed.
* Service implementation can use the callback to deallocate
* cached data related to the file.
*/
typedef void (*ELFCloseListener)(ELF_File *);
extern void elf_add_close_listener(ELFCloseListener listener);
#endif
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