elf.h

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#ifndef _ELF_H_
#define _ELF_H_

typedef unsigned long int       Elf32_Addr;
typedef unsigned short int      Elf32_Half;
typedef unsigned long int       Elf32_Off;
typedef signed long int         Elf32_Sword;
typedef unsigned long int       Elf32_Word;


#define EI_NIDENT       16

typedef struct {
        unsigned char   e_ident[EI_NIDENT];     
        Elf32_Half              e_type;                         
        Elf32_Half              e_machine;                      
        Elf32_Word              e_version;                      
        Elf32_Addr              e_entry;                        
        Elf32_Off               e_phoff;                        
        Elf32_Off               e_shoff;                        
        Elf32_Word              e_flags;                        
        Elf32_Half              e_ehsize;                       
        Elf32_Half              e_phentsize;            
        Elf32_Half              e_phnum;                        
        Elf32_Half              e_shentsize;            
        Elf32_Half              e_shnum;                        
        Elf32_Half              e_shstrndx;                     
} Elf32_Ehdr;

/* Indices pour e_ident: */
#define EI_MAG0         0       
#define EI_MAG1         1       
#define EI_MAG2         2       
#define EI_MAG3         3       
#define EI_CLASS        4
        #define ELFCLASSNONE    0       
        #define ELFCLASS32              1       
        #define ELFCLASS64              2       
#define EI_DATA         5
        #define ELFDATANONE             0       
        #define ELFDATA2LSB             1       
        #define ELFDATA2MSB             2       
#define EI_VERSION      6
#define EI_PAD          7


/* Valeurs pour e_type: */
#define ET_NONE         0       
#define ET_REL          1       
#define ET_EXE          2       
#define ET_DYN          3       
#define ET_CORE         4       
#define ET_LOPROC       0xff00  
#define ET_HIPROC       0xffff  
/* Valeurs pour e_machine: */
#define EM_NONE         0       
#define EM_M32          1       
#define EM_SPARC        2       
#define EM_386          3       
#define EM_68K          4       
#define EM_88K          5       
#define EM_860          7       
#define EM_MIPS         8       
/* Valeurs pour e_version: */
#define EV_NONE         0
#define EV_CURRENT      1

/*******************************
 * 
 * PROGRAM HEADER
 * 
 *******************************/
 
/* Indices des sections spéciales */
#define SHN_UNDEF               0
#define SHN_LORESERVE   0xff00
#define SHN_LOPROC              0xff00
#define SHN_HIPROC              0xff1f
#define SHN_ABS                 0xfff1
#define SHN_COMMON              0xfff2
#define SHN_HIRESERVE   0xffff

typedef struct{
        Elf32_Word      p_type;         
        Elf32_Off       p_offset;               
        Elf32_Addr      p_vaddr;        
        Elf32_Addr      p_paddr;        
        Elf32_Word      p_filesz; 
        Elf32_Word      p_memsz;        
        Elf32_Word      p_flags;        
        Elf32_Word      p_align;        
}Elf32_Phdr;

/* Valeurs prises par p_type: */
#define PT_NULL         0               
#define PT_LOAD         1               
#define PT_DYNAMIC      2       
#define PT_INTERP       3               
#define PT_NOTE         4               
#define PT_SHLIB        5               
#define PT_PHDR         6               
#define PT_LOPROC       0x7000000       
#define PT_HIPROC       0x7FFFFFF       
/* Valeurs prises par p_flags */
#define PF_X    0x1
#define PF_W    0x2
#define PF_R    0x4

/********************************
 * 
 * SECTION HEADER
 * 
 ********************************/
 
typedef struct {
        Elf32_Word      sh_name;                
        Elf32_Word      sh_type;                
        Elf32_Word      sh_flags;               
        Elf32_Addr      sh_addr;                
        Elf32_Off       sh_offset;              
        Elf32_Word      sh_size;                
        Elf32_Word      sh_link;                
        Elf32_Word      sh_info;                
        Elf32_Word      sh_addralign;   
        Elf32_Word      sh_entsize;             
}Elf32_Shdr;

/* Valeurs pour sh_type */
#define SHT_NULL                0
#define SHT_PROGBITS    1
#define SHT_SYMTAB              2
#define SHT_STRTAB              3
#define SHT_RELA                4
#define SHT_HASH                5
#define SHT_DYNAMIC             6
#define SHT_NOTE                7
#define SHT_NOBITS              8
#define SHT_REL                 9
#define SHT_SHLIB               10
#define SHT_DYNSYM              11
#define SHT_LOPROC              0x70000000
#define SHT_HIPROC              0x7fffffff
#define SHT_LOUSER              0x80000000
#define SHT_HIUSER              0x8fffffff

/* Masques pour sh_flag */
#define SHF_WRITE               1
#define SHF_ALLOC               2
#define SHF_EXECINSTR   4
#define SHF_MASKPROC    0xf0000000

/***************************
 * 
 * SYMBOL TABLE
 * 
 ***************************/
 
typedef struct {
        Elf32_Word              st_name;        
        Elf32_Addr              st_value;       
        Elf32_Word              st_size;        
        unsigned char   st_info;        
        unsigned char   st_other;       
        Elf32_Half              st_shndx;       
}Elf32_Sym;



/* Macros pour st_info */
#define ELF32_ST_BIND(i)        ((i)>>4)
#define ELF32_ST_TYPE(i)        ((i)&0xf)
#define ELF32_ST_INFO(b,t)      (((b)<<4)+((t)&0xf))

/* Valeurs pour ELF32_ST_BIND */
#define STB_LOCAL       0               
#define STB_GLOBAL      1               
#define STB_WEAK        2               
#define STB_LOPROC      13
#define STB_HIPROC      15

/* valeurs pour ELF32_ST_TYPE */
#define STT_NOTYPE      0       
#define STT_OBJECT      1       
#define STT_FUNC        2       
#define STT_SECTION     3       
#define STT_FILE        4       
#define STT_LOPROC      13
#define STT_HIPROC      15

/***************************
 * 
 * RELOCATIONS
 * 
 ***************************/

typedef struct {
        Elf32_Addr      r_offset;
        Elf32_Word      r_info;
} Elf32_Rel;

typedef struct {
        Elf32_Addr      r_offset;
        Elf32_Word      r_info;
        Elf32_Word      r_addend;
} Elf32_Rela;

/* Macros pour r_info */
#define ELF32_R_SYM(i)          ((i)>>8)
#define ELF32_R_TYPE(i)         ((unsigned char)(i))
#define ELF32_R_INFO(s,t)       (((s)<<8)+(unsigned char)(t))

/* Valeurs pour le type contenu dans r_info */
#define R_386_NONE              0
#define R_386_32                1
#define R_386_PC32              2
#define R_386_GOT32             3
#define R_386_PLT32             4
#define R_386_COPY              5
#define R_386_GLOB_DAT  6
#define R_386_JMP_SLOT  7
#define R_386_RELATIVE  8
#define R_386_GOTOFF    9
#define R_386_GOTPC             10

/***************************
 * 
 * ELF FILE
 * 
 ***************************/
 
typedef struct {
        char* name; 
        Elf32_Ehdr* elf_header;
        
        Elf32_Phdr* pheaders;
        Elf32_Shdr* sheaders;
        
        int nb_symbols;
        Elf32_Sym* sym_table;
        
        char* string_table;
        char* symbol_string_table;
        
}Elf32_File;
int load_efl_header(Elf32_Ehdr* elf_header, int fd);

int load_program_header(Elf32_Phdr* program_header, Elf32_Ehdr* elf_header, int index, int fd);

int load_section_header(Elf32_Shdr* section_header, Elf32_Ehdr* elf_header, int index, int fd);

unsigned long int elf_size(int fd);

int load_elf(int fd, void* dest);

Elf32_File* load_elf_file(int fd);


Elf32_Sym* find_symbol(Elf32_File* file, const char* symbol);

void elf_info(char* name);


#endif /* _ELF_H_ */