ELF段表的结构(Elf32_Shdr)

typedef struct
{
  Elf32_Word    sh_name;
  Elf32_Word    sh_type;
  Elf32_Word    sh_flags;
  Elf32_Addr    sh_addr;  /* Section virtual addr at execution */
  Elf32_Off     sh_offset; /* Section file offset */
  Elf32_Word    sh_size;  /* Section size in bytes */
  Elf32_Word    sh_link;
  Elf32_Word    sh_info;
  Elf32_Word    sh_addralign;
  Elf32_Word    sh_entsize; /* Entry size if section holds table */
} Elf32_Shdr;

#define SHT_PROGBITS	  1	/* Program data */
#define SHT_SYMTAB	  2	/* Symbol table */
#define SHT_STRTAB	  3	/* String table */
#define SHT_RELA	  4	/* Relocation entries with addends */
#define SHT_HASH	  5	/* Symbol hash table */
#define SHT_DYNAMIC	  6	/* Dynamic linking information */
#define SHT_NOTE	  7	/* Notes */
#define SHT_NOBITS	  8	/* Program space with no data (bss) */
#define SHT_REL		  9	/* Relocation entries, no addends */
#define SHT_SHLIB	  10	/* Reserved */
#define SHT_DYNSYM	  11	/* Dynamic linker symbol table */
#define SHT_INIT_ARRAY	  14	/* Array of constructors */
#define SHT_FINI_ARRAY	  15	/* Array of destructors */
#define SHT_PREINIT_ARRAY 16	/* Array of pre-constructors */
#define SHT_GROUP	  17	/* Section group */
#define SHT_SYMTAB_SHNDX  18	/* Extended section indices */

#define SHF_WRITE	     (1 << 0)	/* Writable */
#define SHF_ALLOC	     (1 << 1)	/* Occupies memory during execution */
#define SHF_EXECINSTR	     (1 << 2)	/* Executable */
#define SHF_MERGE	     (1 << 4)	/* Might be merged */
#define SHF_STRINGS	     (1 << 5)	/* Contains nul-terminated strings */
#define SHF_INFO_LINK	     (1 << 6)	/* `sh_info' contains SHT index */
#define SHF_LINK_ORDER	     (1 << 7)	/* Preserve order after combining */
#define SHF_OS_NONCONFORMING (1 << 8)	/* Non-standard OS specific handling required */
#define SHF_GROUP	     (1 << 9)	/* Section is member of a group.  */
#define SHF_TLS		     (1 << 10)	/* Section hold thread-local data.  */
#define SHF_COMPRESSED	     (1 << 11)	/* Section with compressed data. */
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