Subversion Repositories or1k_old

/* BFD ECOFF object file private structure.

   Copyright 1993, 1994, 1995, 1996, 1999, 2001, 2002

   Free Software Foundation, Inc.

   Written by Ian Lance Taylor, Cygnus Support.

This file is part of BFD, the Binary File Descriptor library.

This program is free software; you can redistribute it and/or modify

it under the terms of the GNU General Public License as published by

the Free Software Foundation; either version 2 of the License, or

(at your option) any later version.

This program is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

GNU General Public License for more details.

You should have received a copy of the GNU General Public License

along with this program; if not, write to the Free Software

Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

#include "bfdlink.h"

#ifndef ECOFF_H

#include "coff/ecoff.h"

#endif

/* This is the backend information kept for ECOFF files.  This

   structure is constant for a particular backend.  The first element

   is the COFF backend data structure, so that ECOFF targets can use

   the generic COFF code.  */

#define ecoff_backend(abfd) \

  ((struct ecoff_backend_data *) (abfd)->xvec->backend_data)

struct ecoff_backend_data

{

  /* COFF backend information.  This must be the first field.  */

  bfd_coff_backend_data coff;

  /* Supported architecture.  */

  enum bfd_architecture arch;

  /* Initial portion of armap string.  */

  const char *armap_start;

  /* The page boundary used to align sections in a demand-paged

     executable file.  E.g., 0x1000.  */

  bfd_vma round;

  /* True if the .rdata section is part of the text segment, as on the

     Alpha.  False if .rdata is part of the data segment, as on the

     MIPS.  */

  boolean rdata_in_text;

  /* Bitsize of constructor entries.  */

  unsigned int constructor_bitsize;

  /* Reloc to use for constructor entries.  */

  reloc_howto_type *constructor_reloc;

  /* How to swap debugging information.  */

  struct ecoff_debug_swap debug_swap;

  /* External reloc size.  */

  bfd_size_type external_reloc_size;

  /* Reloc swapping functions.  */

  void (*swap_reloc_in) PARAMS ((bfd *, PTR, struct internal_reloc *));

  void (*swap_reloc_out) PARAMS ((bfd *, const struct internal_reloc *, PTR));

  /* Backend reloc tweaking.  */

  void (*adjust_reloc_in) PARAMS ((bfd *, const struct internal_reloc *,

                                   arelent *));

  void (*adjust_reloc_out) PARAMS ((bfd *, const arelent *,

                                    struct internal_reloc *));

  /* Relocate section contents while linking.  */

  boolean (*relocate_section) PARAMS ((bfd *output_bfd, struct bfd_link_info *,

                                       bfd *input_bfd, asection *input_section,

                                       bfd_byte *contents,

                                       PTR external_relocs));

  /* Do final adjustments to filehdr and aouthdr.  */

  boolean (*adjust_headers) PARAMS ((bfd *, struct internal_filehdr *,

                                     struct internal_aouthdr *));

  /* Read an element from an archive at a given file position.  This

     is needed because OSF/1 3.2 uses a weird archive format.  */

  bfd *(*get_elt_at_filepos) PARAMS ((bfd *, file_ptr));

};

/* This is the target specific information kept for ECOFF files.  */

#define ecoff_data(abfd) ((abfd)->tdata.ecoff_obj_data)

typedef struct ecoff_tdata

{

  /* The reloc file position, set by

     ecoff_compute_section_file_positions.  */

  file_ptr reloc_filepos;

  /* The symbol table file position, set by _bfd_ecoff_mkobject_hook.  */

  file_ptr sym_filepos;

  /* The start and end of the text segment.  Only valid for an

     existing file, not for one we are creating.  */

  unsigned long text_start;

  unsigned long text_end;

  /* The cached gp value.  This is used when relocating.  */

  bfd_vma gp;

  /* The maximum size of objects to optimize using gp.  This is

     typically set by the -G option to the compiler, assembler or

     linker.  */

  unsigned int gp_size;

  /* The register masks.  When linking, all the masks found in the

     input files are combined into the masks of the output file.

     These are not all used for all targets, but that's OK, because

     the relevant ones are the only ones swapped in and out.  */

  unsigned long gprmask;

  unsigned long fprmask;

  unsigned long cprmask[4];

  /* The ECOFF symbolic debugging information.  */

  struct ecoff_debug_info debug_info;

  /* The unswapped ECOFF symbolic information.  */

  PTR raw_syments;

  /* The canonical BFD symbols.  */

  struct ecoff_symbol_struct *canonical_symbols;

  /* A mapping from external symbol numbers to entries in the linker

     hash table, used when linking.  */

  struct ecoff_link_hash_entry **sym_hashes;

  /* A mapping from reloc symbol indices to sections, used when

     linking.  */

  asection **symndx_to_section;

  /* True if this BFD was written by the backend linker.  */

  boolean linker;

  /* True if a warning that multiple global pointer values are

     needed in the output binary was issued already.  */

  boolean issued_multiple_gp_warning;

  /* Used by find_nearest_line entry point.  The structure could be

     included directly in this one, but there's no point to wasting

     the memory just for the infrequently called find_nearest_line.  */

  struct ecoff_find_line *find_line_info;

  /* Whether the .rdata section is in the text segment for this

     particular ECOFF file.  This is not valid until

     ecoff_compute_section_file_positions is called.  */

  boolean rdata_in_text;

} ecoff_data_type;

/* Each canonical asymbol really looks like this.  */

typedef struct ecoff_symbol_struct

{

  /* The actual symbol which the rest of BFD works with */

  asymbol symbol;

  /* The fdr for this symbol.  */

  FDR *fdr;

  /* true if this is a local symbol rather than an external one.  */

  boolean local;

  /* A pointer to the unswapped hidden information for this symbol.

     This is either a struct sym_ext or a struct ext_ext, depending on

     the value of the local field above.  */

  PTR native;

} ecoff_symbol_type;

/* We take the address of the first element of an asymbol to ensure that the

   macro is only ever applied to an asymbol.  */

#define ecoffsymbol(asymbol) ((ecoff_symbol_type *) (&((asymbol)->the_bfd)))

/* We need to save the index of an external symbol when we write it

   out so that can set the symbol index correctly when we write out

   the relocs.  */

#define ecoff_get_sym_index(symbol) ((symbol)->udata.i)

#define ecoff_set_sym_index(symbol, idx) ((symbol)->udata.i = (idx))

/* When generating MIPS embedded PIC code, the linker relaxes the code

   to turn PC relative branches into longer code sequences when the PC

   relative branch is out of range.  This involves reading the relocs

   in bfd_relax_section as well as in bfd_final_link, and requires the

   code to keep track of which relocs have been expanded.  A pointer

   to this structure is put in the used_by_bfd pointer of a section to

   keep track of this information.  The user_by_bfd pointer will be

   NULL if the information was not needed.  */

struct ecoff_section_tdata

{

  /* The unswapped relocs for this section.  These are stored in

     memory so the input file does not have to be read twice.  */

  PTR external_relocs;

  /* The contents of the section.  These bytes may or may not be saved

     in memory, but if it is this is a pointer to them.  */

  bfd_byte *contents;

  /* Offset adjustments for PC relative branches.  A number other than

     1 is an addend for a PC relative branch, or a switch table entry

     which is the difference of two .text locations; this addend

     arises because the branch or difference crosses one or more

     branches which were expanded into a larger code sequence.  A 1

     means that this branch was itself expanded into a larger code

     sequence.  1 is not a possible offset, since all offsets must be

     multiples of the instruction size, which is 4; also, the only

     relocs with non-zero offsets will be PC relative branches or

     switch table entries within the same object file.  If this field

     is NULL, no branches were expanded and no offsets are required.

     Otherwise there are as many entries as there are relocs in the

     section, and the entry for any reloc that is not PC relative is

     zero.  */

  long *offsets;

  /* When producing an executable (i.e., final, non-relocatable link)

     on the Alpha, we may need to use multiple global pointer values

     to span the entire .lita section.  In essence, we allow each

     input .lita section to have its own gp value.  To support this,

     we need to keep track of the gp values that we picked for each

     input .lita section . */

  bfd_vma gp;

};

/* An accessor macro for the ecoff_section_tdata structure.  */

#define ecoff_section_data(abfd, sec) \

  ((struct ecoff_section_tdata *) (sec)->used_by_bfd)

/* ECOFF linker hash table entries.  */

struct ecoff_link_hash_entry

{

  struct bfd_link_hash_entry root;

  /* Symbol index in output file.  */

  long indx;

  /* BFD that ext field value came from.  */

  bfd *abfd;

  /* ECOFF external symbol information.  */

  EXTR esym;

  /* Nonzero if this symbol has been written out.  */

  char written;

  /* Nonzero if this symbol was referred to as small undefined.  */

  char small;

};

/* ECOFF linker hash table.  */

struct ecoff_link_hash_table

{

  struct bfd_link_hash_table root;

};

/* Make an ECOFF object.  */

extern boolean _bfd_ecoff_mkobject PARAMS ((bfd *));

/* Read in the ECOFF symbolic debugging information.  */

extern boolean _bfd_ecoff_slurp_symbolic_info

  PARAMS ((bfd *, asection *, struct ecoff_debug_info *));

/* Generic ECOFF BFD backend vectors.  */

extern boolean _bfd_ecoff_write_object_contents PARAMS ((bfd *abfd));

extern const bfd_target *_bfd_ecoff_archive_p PARAMS ((bfd *abfd));

#define _bfd_ecoff_close_and_cleanup _bfd_generic_close_and_cleanup

#define _bfd_ecoff_bfd_free_cached_info _bfd_generic_bfd_free_cached_info

extern boolean _bfd_ecoff_new_section_hook

  PARAMS ((bfd *, asection *));

extern boolean _bfd_ecoff_get_section_contents

  PARAMS ((bfd *, asection *, PTR location, file_ptr, bfd_size_type));

#define _bfd_ecoff_bfd_link_split_section _bfd_generic_link_split_section

extern boolean _bfd_ecoff_bfd_copy_private_bfd_data PARAMS ((bfd *, bfd *));

#define _bfd_ecoff_bfd_copy_private_section_data \

  _bfd_generic_bfd_copy_private_section_data

#define _bfd_ecoff_bfd_copy_private_symbol_data \

  _bfd_generic_bfd_copy_private_symbol_data

#define _bfd_ecoff_bfd_print_private_bfd_data \

  _bfd_generic_bfd_print_private_bfd_data

#define _bfd_ecoff_bfd_merge_private_bfd_data \

  _bfd_generic_bfd_merge_private_bfd_data

#define _bfd_ecoff_bfd_set_private_flags _bfd_generic_bfd_set_private_flags

extern boolean _bfd_ecoff_slurp_armap PARAMS ((bfd *abfd));

#define _bfd_ecoff_slurp_extended_name_table _bfd_slurp_extended_name_table

#define _bfd_ecoff_construct_extended_name_table \

  _bfd_archive_bsd_construct_extended_name_table

#define _bfd_ecoff_truncate_arname bfd_dont_truncate_arname

extern boolean _bfd_ecoff_write_armap

  PARAMS ((bfd *, unsigned int, struct orl *, unsigned int, int));

#define _bfd_ecoff_read_ar_hdr _bfd_generic_read_ar_hdr

#define _bfd_ecoff_openr_next_archived_file \

  bfd_generic_openr_next_archived_file

#define _bfd_ecoff_get_elt_at_index _bfd_generic_get_elt_at_index

#define _bfd_ecoff_generic_stat_arch_elt bfd_generic_stat_arch_elt

#define _bfd_ecoff_update_armap_timestamp bfd_true

extern long _bfd_ecoff_get_symtab_upper_bound PARAMS ((bfd *abfd));

extern long _bfd_ecoff_get_symtab PARAMS ((bfd *abfd, asymbol **alocation));

extern asymbol *_bfd_ecoff_make_empty_symbol PARAMS ((bfd *abfd));

extern void _bfd_ecoff_print_symbol

  PARAMS ((bfd *, PTR filep, asymbol *, bfd_print_symbol_type));

extern void _bfd_ecoff_get_symbol_info

  PARAMS ((bfd *, asymbol *, symbol_info *));

extern boolean _bfd_ecoff_bfd_is_local_label_name

  PARAMS ((bfd *, const char *));

#define _bfd_ecoff_get_lineno _bfd_nosymbols_get_lineno

extern boolean _bfd_ecoff_find_nearest_line

  PARAMS ((bfd *, asection *, asymbol **, bfd_vma offset,

           const char **filename_ptr, const char **fnname_ptr,

           unsigned int *retline_ptr));

#define _bfd_ecoff_bfd_make_debug_symbol _bfd_nosymbols_bfd_make_debug_symbol

#define _bfd_ecoff_read_minisymbols _bfd_generic_read_minisymbols

#define _bfd_ecoff_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol

#define _bfd_ecoff_get_reloc_upper_bound coff_get_reloc_upper_bound

extern long _bfd_ecoff_canonicalize_reloc

  PARAMS ((bfd *, asection *, arelent **, asymbol **symbols));

/* ecoff_bfd_reloc_type_lookup defined by backend. */

extern boolean _bfd_ecoff_set_arch_mach

  PARAMS ((bfd *, enum bfd_architecture, unsigned long));

extern boolean _bfd_ecoff_set_section_contents

  PARAMS ((bfd *, asection *, PTR location, file_ptr, bfd_size_type));

extern int _bfd_ecoff_sizeof_headers PARAMS ((bfd *abfd, boolean reloc));

/* ecoff_bfd_get_relocated_section_contents defined by backend.  */

/* ecoff_bfd_relax_section defined by backend.  */

extern struct bfd_link_hash_table *_bfd_ecoff_bfd_link_hash_table_create

  PARAMS ((bfd *));

#define _bfd_ecoff_bfd_link_hash_table_free _bfd_generic_link_hash_table_free

extern boolean _bfd_ecoff_bfd_link_add_symbols

  PARAMS ((bfd *, struct bfd_link_info *));

#define _bfd_ecoff_bfd_link_just_syms _bfd_generic_link_just_syms

extern boolean _bfd_ecoff_bfd_final_link

  PARAMS ((bfd *, struct bfd_link_info *));

/* Hook functions for the generic COFF section reading code.  */

extern PTR _bfd_ecoff_mkobject_hook PARAMS ((bfd *, PTR filehdr, PTR aouthdr));

#define _bfd_ecoff_set_alignment_hook \

  ((void (*) PARAMS ((bfd *, asection *, PTR))) bfd_void)

extern boolean _bfd_ecoff_set_arch_mach_hook PARAMS ((bfd *abfd, PTR filehdr));

extern boolean _bfd_ecoff_styp_to_sec_flags

  PARAMS ((bfd *, PTR, const char *, asection *, flagword *));

extern boolean _bfd_ecoff_slurp_symbol_table PARAMS ((bfd *abfd));

/* ECOFF auxiliary information swapping routines.  These are the same

   for all ECOFF targets, so they are defined in ecofflink.c.  */

extern void _bfd_ecoff_swap_tir_in

  PARAMS ((int, const struct tir_ext *, TIR *));

extern void _bfd_ecoff_swap_tir_out

  PARAMS ((int, const TIR *, struct tir_ext *));

extern void _bfd_ecoff_swap_rndx_in

  PARAMS ((int, const struct rndx_ext *, RNDXR *));

extern void _bfd_ecoff_swap_rndx_out

  PARAMS ((int, const RNDXR *, struct rndx_ext *));