bfd/libnlm.h

/* BFD back-end data structures for NLM (NetWare Loadable Modules) files.
   Copyright (C) 1993-2016 Free Software Foundation, Inc.
   Written by 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 3 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., 51 Franklin Street - Fifth Floor, Boston,
   MA 02110-1301, USA.  */

#ifndef _LIBNLM_H_
#define _LIBNLM_H_ 1

#ifdef ARCH_SIZE
#  define NLM_ARCH_SIZE ARCH_SIZE
#endif
#include "nlm/common.h"
#include "nlm/internal.h"
#include "nlm/external.h"

/* A reloc for an imported NLM symbol.  Normal relocs are associated
   with sections, and include a symbol.  These relocs are associated
   with (undefined) symbols, and include a section.  */

struct nlm_relent
{
  /* Section of reloc.  */
  asection *section;
  /* Reloc info (sym_ptr_ptr field set only when canonicalized).  */
  arelent reloc;
};

/* Information we keep for an NLM symbol.  */

typedef struct
{
  /* BFD symbol.  */
  asymbol symbol;
  /* Number of reloc entries for imported symbol.  */
  bfd_size_type rcnt;
  /* Array of reloc information for imported symbol.  */
  struct nlm_relent *relocs;
} nlmNAME(symbol_type);

extern bfd_boolean        nlm_mkobject                    (bfd *);
extern bfd_boolean        nlm_set_arch_mach               (bfd *, enum bfd_architecture, unsigned long);
extern void               nlmNAME (get_symbol_info)       (bfd *, asymbol *, symbol_info *);
extern long               nlmNAME (get_symtab_upper_bound)(bfd *);
extern long               nlmNAME (canonicalize_symtab)   (bfd *, asymbol **);
extern asymbol *          nlmNAME (make_empty_symbol)     (bfd *);
extern void               nlmNAME (print_symbol)          (bfd *, void *, asymbol *, bfd_print_symbol_type);
extern long               nlmNAME (get_reloc_upper_bound) (bfd *, asection *);
extern long               nlmNAME (canonicalize_reloc)    (bfd *, asection *, arelent **, asymbol **);
extern const bfd_target * nlmNAME (object_p)              (bfd *);
extern bfd_boolean        nlmNAME (set_arch_mach)         (bfd *, enum bfd_architecture, unsigned long);
extern bfd_boolean        nlmNAME (set_section_contents)  (bfd *, asection *, const void *, file_ptr, bfd_size_type);
extern bfd_boolean        nlmNAME (write_object_contents) (bfd *);

/* Some private data is stashed away for future use using the tdata pointer
   in the bfd structure.  */

struct nlm_obj_tdata
{
  /* Actual data, but ref like ptr */
  Nlm_Internal_Fixed_Header	nlm_fixed_hdr[1];
  Nlm_Internal_Variable_Header	nlm_variable_hdr[1];
  Nlm_Internal_Version_Header	nlm_version_hdr[1];
  Nlm_Internal_Copyright_Header	nlm_copyright_hdr[1];
  Nlm_Internal_Extended_Header	nlm_extended_hdr[1];
  Nlm_Internal_Custom_Header	nlm_custom_hdr[1];
  Nlm_Internal_Cygnus_Ext_Header nlm_cygnus_ext_hdr[1];
  /* BFD NLM symbols.  */
  nlmNAME (symbol_type)	*	nlm_symbols;
  /* Lowest text and data VMA values.  */
  bfd_vma			nlm_text_low;
  bfd_vma			nlm_data_low;
  /* Caches for data read from object file.  */
  arelent *			nlm_reloc_fixups;
  asection **			nlm_reloc_fixup_secs;
  /* Backend specific information.  This should probably be a pointer,
     but that would require yet another entry point to initialize the
     structure.  */
  union
    {
      struct	/* Alpha backend information.  */
	{
	  bfd_vma gp;			/* GP value.  */
	  bfd_vma lita_address;		/* .lita section address.  */
	  bfd_size_type lita_size;	/* .lita section size.  */
	}
      alpha_backend_data;
    }
  backend_data;
};

#define nlm_tdata(bfd)			((bfd) -> tdata.nlm_obj_data)
#define nlm_fixed_header(bfd)		(nlm_tdata (bfd) -> nlm_fixed_hdr)
#define nlm_variable_header(bfd)	(nlm_tdata (bfd) -> nlm_variable_hdr)
#define nlm_version_header(bfd)		(nlm_tdata (bfd) -> nlm_version_hdr)
#define nlm_copyright_header(bfd)	(nlm_tdata (bfd) -> nlm_copyright_hdr)
#define nlm_extended_header(bfd)	(nlm_tdata (bfd) -> nlm_extended_hdr)
#define nlm_custom_header(bfd)		(nlm_tdata (bfd) -> nlm_custom_hdr)
#define nlm_cygnus_ext_header(bfd)	(nlm_tdata (bfd) -> nlm_cygnus_ext_hdr)
#define nlm_get_symbols(bfd)		(nlm_tdata (bfd) -> nlm_symbols)
#define nlm_set_symbols(bfd, p)		(nlm_tdata (bfd) -> nlm_symbols = (p))
#define nlm_set_text_low(bfd, i)	(nlm_tdata (bfd) -> nlm_text_low = (i))
#define nlm_get_text_low(bfd)		(nlm_tdata (bfd) -> nlm_text_low)
#define nlm_set_data_low(bfd, i)	(nlm_tdata (bfd) -> nlm_data_low = (i))
#define nlm_get_data_low(bfd)		(nlm_tdata (bfd) -> nlm_data_low)
#define nlm_relocation_fixups(bfd)	(nlm_tdata (bfd) -> nlm_reloc_fixups)
#define nlm_relocation_fixup_secs(bfd)	(nlm_tdata (bfd) -> nlm_reloc_fixup_secs)
#define nlm_alpha_backend_data(bfd)    (&nlm_tdata (bfd) -> backend_data.alpha_backend_data)

/* This is used when writing out the external relocs. */

struct reloc_and_sec
{
  arelent *rel;
  asection *sec;
};

/* We store some function pointer in the backend structure.  This lets
   different NLM targets share most of the same code, while providing
   slightly different code where necessary.  */

struct nlm_backend_data
{
  /* Signature for this backend.  */
  char signature[NLM_SIGNATURE_SIZE];
  /* Size of the fixed header.  */
  bfd_size_type fixed_header_size;
  /* Size of optional prefix for this backend.  Some backend may
     require this to be a function, but so far a constant is OK.  This
     is for a prefix which precedes the standard NLM fixed header.  */
  bfd_size_type optional_prefix_size;
  /* Architecture.  */
  enum bfd_architecture arch;
  /* Machine.  */
  unsigned int mach;
  /* Some NLM formats do not use the uninitialized data section, so
     all uninitialized data must be put into the regular data section
     instead.  */
  bfd_boolean no_uninitialized_data;
  /* Some NLM formats have a prefix on the file.  If this function is
     not NULL, it will be called by nlm_object_p.  It should return
     TRUE if this file could match this format, and it should leave
     the BFD such that a bfd_bread will pick up the fixed header.  */
  bfd_boolean (*nlm_backend_object_p) (bfd *);
  /* Write out the prefix.  This function may be NULL.  This must
     write out the same number of bytes as is in the field
     optional_prefix_size.  */
  bfd_boolean (*nlm_write_prefix) (bfd *);
  /* Read a relocation fixup from abfd.  The reloc information is
     machine specific.  The second argument is the symbol if this is
     an import, or NULL if this is a reloc fixup.  This function
     should set the third argument to the section which the reloc
     belongs in, and the fourth argument to the reloc itself; it does
     not need to fill in the sym_ptr_ptr field for a reloc against an
     import symbol.  */
  bfd_boolean (*nlm_read_reloc) (bfd *, nlmNAME (symbol_type) *, asection **, arelent *);
  /* To make objcopy to an i386 NLM work, the i386 backend needs a
     chance to work over the relocs.  This is a bit icky.  */
  bfd_boolean (*nlm_mangle_relocs) (bfd *, asection *, const void *, bfd_vma,  bfd_size_type);
  /* Read an import record from abfd.  It would be nice if this
     were in a machine-dependent format, but it doesn't seem to be. */
  bfd_boolean (*nlm_read_import) (bfd *, nlmNAME (symbol_type) *);
  /* Write an import record to abfd. */
  bfd_boolean (*nlm_write_import) (bfd *, asection *, arelent *);
  /* Set the section for a public symbol.  This may be NULL, in which
     case a default method will be used.  */
  bfd_boolean (*nlm_set_public_section) (bfd *, nlmNAME (symbol_type) *);
  /* Get the offset to write out for a public symbol.  This may be
     NULL, in which case a default method will be used.  */
  bfd_vma (*nlm_get_public_offset) (bfd *, asymbol *);
  /* Swap the fixed header in and out */
  void (*nlm_swap_fhdr_in)  (bfd *, void *, Nlm_Internal_Fixed_Header *);
  void (*nlm_swap_fhdr_out) (bfd *, struct nlm_internal_fixed_header *, void *);
  /* Write out an external reference.  */
  bfd_boolean (*nlm_write_external) (bfd *, bfd_size_type, asymbol *, struct reloc_and_sec *);
  bfd_boolean (*nlm_write_export) (bfd *, asymbol *, bfd_vma);
};

#define nlm_backend(bfd)   ((struct nlm_backend_data *)((bfd) -> xvec -> backend_data))
#define nlm_signature(bfd)                 (nlm_backend (bfd) -> signature)
#define nlm_fixed_header_size(bfd)         (nlm_backend (bfd) -> fixed_header_size)
#define nlm_optional_prefix_size(bfd)      (nlm_backend (bfd) -> optional_prefix_size)
#define nlm_architecture(bfd)              (nlm_backend (bfd) -> arch)
#define nlm_machine(bfd)                   (nlm_backend (bfd) -> mach)
#define nlm_no_uninitialized_data(bfd)     (nlm_backend (bfd) -> no_uninitialized_data)
#define nlm_backend_object_p_func(bfd)     (nlm_backend (bfd) -> nlm_backend_object_p)
#define nlm_write_prefix_func(bfd)         (nlm_backend (bfd) -> nlm_write_prefix)
#define nlm_read_reloc_func(bfd)           (nlm_backend (bfd) -> nlm_read_reloc)
#define nlm_mangle_relocs_func(bfd)        (nlm_backend (bfd) -> nlm_mangle_relocs)
#define nlm_read_import_func(bfd)          (nlm_backend (bfd) -> nlm_read_import)
#define nlm_write_import_func(bfd)         (nlm_backend (bfd) -> nlm_write_import)
#define nlm_set_public_section_func(bfd)   (nlm_backend (bfd) -> nlm_set_public_section)
#define nlm_get_public_offset_func(bfd)    (nlm_backend (bfd) -> nlm_get_public_offset)
#define nlm_swap_fixed_header_in_func(bfd) (nlm_backend (bfd) -> nlm_swap_fhdr_in)
#define nlm_swap_fixed_header_out_func(bfd)(nlm_backend (bfd) -> nlm_swap_fhdr_out)
#define nlm_write_external_func(bfd)       (nlm_backend (bfd) -> nlm_write_external)
#define nlm_write_export_func(bfd)         (nlm_backend (bfd) -> nlm_write_export)

/* The NLM code, data, and uninitialized sections have no names defined
   in the NLM, but bfd wants to give them names, so use the traditional
   UNIX names.  */

#define NLM_CODE_NAME			".text"
#define NLM_INITIALIZED_DATA_NAME	".data"
#define NLM_UNINITIALIZED_DATA_NAME	".bss"

#endif /* _LIBNLM_H_ */