bfd.h

也是一个linux系统下的网络入侵检测程序

#define SEC_IS_COMMON 0x8000

  /* The section contains only debugging information.  For
     example, this is set for ELF .debug and .stab sections.
     strip tests this flag to see if a section can be
     discarded.  */
#define SEC_DEBUGGING 0x10000

  /* The contents of this section are held in memory pointed to
     by the contents field.  This is checked by bfd_get_section_contents,
     and the data is retrieved from memory if appropriate.  */
#define SEC_IN_MEMORY 0x20000

  /* The contents of this section are to be excluded by the
     linker for executable and shared objects unless those
     objects are to be further relocated.  */
#define SEC_EXCLUDE 0x40000

  /* The contents of this section are to be sorted based on the sum of
     the symbol and addend values specified by the associated relocation
     entries.  Entries without associated relocation entries will be
     appended to the end of the section in an unspecified order.  */
#define SEC_SORT_ENTRIES 0x80000

  /* When linking, duplicate sections of the same name should be
     discarded, rather than being combined into a single section as
     is usually done.  This is similar to how common symbols are
     handled.  See SEC_LINK_DUPLICATES below.  */
#define SEC_LINK_ONCE 0x100000

  /* If SEC_LINK_ONCE is set, this bitfield describes how the linker
     should handle duplicate sections.  */
#define SEC_LINK_DUPLICATES 0x600000

  /* This value for SEC_LINK_DUPLICATES means that duplicate
     sections with the same name should simply be discarded.  */
#define SEC_LINK_DUPLICATES_DISCARD 0x0

  /* This value for SEC_LINK_DUPLICATES means that the linker
     should warn if there are any duplicate sections, although
     it should still only link one copy.  */
#define SEC_LINK_DUPLICATES_ONE_ONLY 0x200000

  /* This value for SEC_LINK_DUPLICATES means that the linker
     should warn if any duplicate sections are a different size.  */
#define SEC_LINK_DUPLICATES_SAME_SIZE 0x400000

  /* This value for SEC_LINK_DUPLICATES means that the linker
     should warn if any duplicate sections contain different
     contents.  */
#define SEC_LINK_DUPLICATES_SAME_CONTENTS 0x600000

  /* This section was created by the linker as part of dynamic
     relocation or other arcane processing.  It is skipped when
     going through the first-pass output, trusting that someone
     else up the line will take care of it later.  */
#define SEC_LINKER_CREATED 0x800000

  /* This section should not be subject to garbage collection.  */
#define SEC_KEEP 0x1000000

  /* This section contains "short" data, and should be placed
     "near" the GP.  */
#define SEC_SMALL_DATA 0x2000000

  /* This section contains data which may be shared with other
     executables or shared objects.  */
#define SEC_SHARED 0x4000000

  /* When a section with this flag is being linked, then if the size of
     the input section is less than a page, it should not cross a page
     boundary.  If the size of the input section is one page or more, it
     should be aligned on a page boundary.  */
#define SEC_BLOCK 0x8000000

  /* Conditionally link this section; do not link if there are no
     references found to any symbol in the section.  */
#define SEC_CLINK 0x10000000

  /* Attempt to merge identical entities in the section.
     Entity size is given in the entsize field.  */
#define SEC_MERGE 0x20000000

  /* If given with SEC_MERGE, entities to merge are zero terminated
     strings where entsize specifies character size instead of fixed
     size entries.  */
#define SEC_STRINGS 0x40000000

  /* This section contains data about section groups.  */
#define SEC_GROUP 0x80000000

  /*  End of section flags.  */

  /* Some internal packed boolean fields.  */

  /* See the vma field.  */
  unsigned int user_set_vma : 1;

  /* Whether relocations have been processed.  */
  unsigned int reloc_done : 1;

  /* A mark flag used by some of the linker backends.  */
  unsigned int linker_mark : 1;

  /* Another mark flag used by some of the linker backends.  Set for
     output sections that have an input section.  */
  unsigned int linker_has_input : 1;

  /* A mark flag used by some linker backends for garbage collection.  */
  unsigned int gc_mark : 1;

  /* The following flags are used by the ELF linker. */

  /* Mark sections which have been allocated to segments.  */
  unsigned int segment_mark : 1;

  /* Type of sec_info information.  */
  unsigned int sec_info_type:3;
#define ELF_INFO_TYPE_NONE      0
#define ELF_INFO_TYPE_STABS     1
#define ELF_INFO_TYPE_MERGE     2
#define ELF_INFO_TYPE_EH_FRAME  3
#define ELF_INFO_TYPE_JUST_SYMS 4

  /* Nonzero if this section uses RELA relocations, rather than REL.  */
  unsigned int use_rela_p:1;

  /* Bits used by various backends.  */
  unsigned int has_tls_reloc:1;

  /* Nonzero if this section needs the relax finalize pass.  */
  unsigned int need_finalize_relax:1;

  /* Nonzero if this section has a gp reloc.  */
  unsigned int has_gp_reloc:1;

  /* Unused bits.  */
  unsigned int flag13:1;
  unsigned int flag14:1;
  unsigned int flag15:1;
  unsigned int flag16:4;
  unsigned int flag20:4;
  unsigned int flag24:8;

  /* End of internal packed boolean fields.  */

  /*  The virtual memory address of the section - where it will be
      at run time.  The symbols are relocated against this.  The
      user_set_vma flag is maintained by bfd; if it's not set, the
      backend can assign addresses (for example, in <<a.out>>, where
      the default address for <<.data>> is dependent on the specific
      target and various flags).  */
  bfd_vma vma;

  /*  The load address of the section - where it would be in a
      rom image; really only used for writing section header
      information.  */
  bfd_vma lma;

  /* The size of the section in octets, as it will be output.
     Contains a value even if the section has no contents (e.g., the
     size of <<.bss>>).  This will be filled in after relocation.  */
  bfd_size_type _cooked_size;

  /* The original size on disk of the section, in octets.  Normally this
     value is the same as the size, but if some relaxing has
     been done, then this value will be bigger.  */
  bfd_size_type _raw_size;

  /* If this section is going to be output, then this value is the
     offset in *bytes* into the output section of the first byte in the
     input section (byte ==> smallest addressable unit on the
     target).  In most cases, if this was going to start at the
     100th octet (8-bit quantity) in the output section, this value
     would be 100.  However, if the target byte size is 16 bits
     (bfd_octets_per_byte is "2"), this value would be 50.  */
  bfd_vma output_offset;

  /* The output section through which to map on output.  */
  struct bfd_section *output_section;

  /* The alignment requirement of the section, as an exponent of 2 -
     e.g., 3 aligns to 2^3 (or 8).  */
  unsigned int alignment_power;

  /* If an input section, a pointer to a vector of relocation
     records for the data in this section.  */
  struct reloc_cache_entry *relocation;

  /* If an output section, a pointer to a vector of pointers to
     relocation records for the data in this section.  */
  struct reloc_cache_entry **orelocation;

  /* The number of relocation records in one of the above.  */
  unsigned reloc_count;

  /* Information below is back end specific - and not always used
     or updated.  */

  /* File position of section data.  */
  file_ptr filepos;

  /* File position of relocation info.  */
  file_ptr rel_filepos;

  /* File position of line data.  */
  file_ptr line_filepos;

  /* Pointer to data for applications.  */
  void *userdata;

  /* If the SEC_IN_MEMORY flag is set, this points to the actual
     contents.  */
  unsigned char *contents;

  /* Attached line number information.  */
  alent *lineno;

  /* Number of line number records.  */
  unsigned int lineno_count;

  /* Entity size for merging purposes.  */
  unsigned int entsize;

  /* Optional information about a COMDAT entry; NULL if not COMDAT.  */
  struct bfd_comdat_info *comdat;

  /* Points to the kept section if this section is a link-once section,
     and is discarded.  */
  struct bfd_section *kept_section;

  /* When a section is being output, this value changes as more
     linenumbers are written out.  */
  file_ptr moving_line_filepos;

  /* What the section number is in the target world.  */
  int target_index;

  void *used_by_bfd;

  /* If this is a constructor section then here is a list of the
     relocations created to relocate items within it.  */
  struct relent_chain *constructor_chain;

  /* The BFD which owns the section.  */
  bfd *owner;

  /* A symbol which points at this section only.  */
  struct bfd_symbol *symbol;
  struct bfd_symbol **symbol_ptr_ptr;

  struct bfd_link_order *link_order_head;
  struct bfd_link_order *link_order_tail;
} asection;

/* These sections are global, and are managed by BFD.  The application
   and target back end are not permitted to change the values in
   these sections.  New code should use the section_ptr macros rather
   than referring directly to the const sections.  The const sections
   may eventually vanish.  */
#define BFD_ABS_SECTION_NAME "*ABS*"
#define BFD_UND_SECTION_NAME "*UND*"
#define BFD_COM_SECTION_NAME "*COM*"
#define BFD_IND_SECTION_NAME "*IND*"

/* The absolute section.  */
extern asection bfd_abs_section;
#define bfd_abs_section_ptr ((asection *) &bfd_abs_section)
#define bfd_is_abs_section(sec) ((sec) == bfd_abs_section_ptr)
/* Pointer to the undefined section.  */
extern asection bfd_und_section;
#define bfd_und_section_ptr ((asection *) &bfd_und_section)
#define bfd_is_und_section(sec) ((sec) == bfd_und_section_ptr)
/* Pointer to the common section.  */
extern asection bfd_com_section;
#define bfd_com_section_ptr ((asection *) &bfd_com_section)
/* Pointer to the indirect section.  */
extern asection bfd_ind_section;
#define bfd_ind_section_ptr ((asection *) &bfd_ind_section)
#define bfd_is_ind_section(sec) ((sec) == bfd_ind_section_ptr)

#define bfd_is_const_section(SEC)              \
 (   ((SEC) == bfd_abs_section_ptr)            \
  || ((SEC) == bfd_und_section_ptr)            \
  || ((SEC) == bfd_com_section_ptr)            \
  || ((SEC) == bfd_ind_section_ptr))

extern const struct bfd_symbol * const bfd_abs_symbol;
extern const struct bfd_symbol * const bfd_com_symbol;
extern const struct bfd_symbol * const bfd_und_symbol;
extern const struct bfd_symbol * const bfd_ind_symbol;
#define bfd_get_section_size_before_reloc(section) \
     ((section)->_raw_size)
#define bfd_get_section_size_after_reloc(section) \
     ((section)->reloc_done ? (section)->_cooked_size \
                            : (abort (), (bfd_size_type) 1))

/* Macros to handle insertion and deletion of a bfd's sections.  These
   only handle the list pointers, ie. do not adjust section_count,
   target_index etc.  */
#define bfd_section_list_remove(ABFD, PS) \
  do                                                   \
    {                                                  \
      asection **_ps = PS;                             \
      asection *_s = *_ps;                             \
      *_ps = _s->next;                                 \
      if (_s->next == NULL)                            \
        (ABFD)->section_tail = _ps;                    \
    }                                                  \
  while (0)
#define bfd_section_list_insert(ABFD, PS, S) \
  do                                                   \
    {                                                  \
      asection **_ps = PS;                             \
      asection *_s = S;                                \
      _s->next = *_ps;                                 \
      *_ps = _s;                                       \
      if (_s->next == NULL)                            \
        (ABFD)->section_tail = &_s->next;              \
    }                                                  \
  while (0)

void bfd_section_list_clear (bfd *);

asection *bfd_get_section_by_name (bfd *abfd, const char *name);

char *bfd_get_unique_section_name
   (bfd *abfd, const char *templat, int *count);

asection *bfd_make_section_old_way (bfd *abfd, const char *name);

asection *bfd_make_section_anyway (bfd *abfd, const char *name);

asection *bfd_make_section (bfd *, const char *name);

bfd_boolean bfd_set_section_flags
   (bfd *abfd, asection *sec, flagword flags);

void bfd_map_over_sections
   (bfd *abfd,
    void (*func) (bfd *abfd, asection *sect, void *obj),
    void *obj);

bfd_boolean bfd_set_section_size
   (bfd *abfd, asection *sec, bfd_size_type val);

bfd_boolean bfd_set_section_contents
   (bfd *abfd, asection *section, const void *data,
    file_ptr offset, bfd_size_type count);

bfd_boolean bfd_get_section_contents
   (bfd *abfd, asection *section, void *location, file_ptr offset,
    bfd_size_type count);

bfd_boolean bfd_copy_private_section_data
   (bfd *ibfd, asection *isec, bfd *obfd, asection *osec);

#define bfd_copy_private_section_data(ibfd, isection, obfd, osection) \
     BFD_SEND (obfd, _bfd_copy_private_section_data, \
               (ibfd, isection, obfd, osection))
void _bfd_strip_section_from_output
   (struct bfd_link_info *info, asection *section);

bfd_boolean bfd_generic_discard_group (bfd *abfd, asection *group);

/* Extracted from archures.c.  */
enum bfd_architecture