bfd/libnlm.h

   1 /* BFD back-end data structures for NLM (NetWare Loadable Modules) files.
   2    Copyright (C) 1993 Free Software Foundation, Inc.
   3    Written by Cygnus Support.
   4
   5 This file is part of BFD, the Binary File Descriptor library.
   6
   7 This program is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2 of the License, or
  10 (at your option) any later version.
  11
  12 This program is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with this program; if not, write to the Free Software
  19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  20
  21 #ifndef _LIBNLM_H_
  22 #define _LIBNLM_H_ 1
  23
  24 #ifdef ARCH_SIZE
  25 #  define NLM_ARCH_SIZE ARCH_SIZE
  26 #endif
  27 #include "nlm/common.h"
  28 #include "nlm/internal.h"
  29 #include "nlm/external.h"
  30
  31 /* A reloc for an imported NLM symbol.  Normal relocs are associated
  32    with sections, and include a symbol.  These relocs are associated
  33    with (undefined) symbols, and include a section.  */
  34
  35 struct nlm_relent
  36 {
  37   /* Section of reloc.  */
  38   asection *section;
  39   /* Reloc info (sym_ptr_ptr field set only when canonicalized).  */
  40   arelent reloc;
  41 };
  42
  43 /* Information we keep for an NLM symbol.  */
  44
  45 typedef struct
  46 {
  47   /* BFD symbol.  */
  48   asymbol symbol;
  49   /* Number of reloc entries for imported symbol.  */
  50   bfd_size_type rcnt;
  51   /* Array of reloc information for imported symbol.  */
  52   struct nlm_relent *relocs;
  53 } nlmNAME(symbol_type);
  54
  55 extern boolean nlm_mkobject PARAMS ((bfd *));
  56 extern boolean nlm_set_arch_mach PARAMS ((bfd *, enum bfd_architecture,
  57                                           unsigned long));
  58
  59 extern void nlmNAME(get_symbol_info)
  60      PARAMS ((bfd *, asymbol *, symbol_info *));
  61 extern long nlmNAME(get_symtab_upper_bound)
  62      PARAMS ((bfd *));
  63 extern long nlmNAME(get_symtab)
  64      PARAMS ((bfd *, asymbol **));
  65 extern asymbol *nlmNAME(make_empty_symbol)
  66      PARAMS ((bfd *));
  67 extern void nlmNAME(print_symbol)
  68      PARAMS ((bfd *, PTR, asymbol *, bfd_print_symbol_type));
  69 extern long nlmNAME(get_reloc_upper_bound)
  70      PARAMS ((bfd *, asection *));
  71 extern long nlmNAME(canonicalize_reloc)
  72      PARAMS ((bfd *, asection *, arelent **, asymbol **));
  73 extern bfd_target *nlmNAME(object_p)
  74      PARAMS ((bfd *));
  75 extern boolean nlmNAME(set_arch_mach)
  76      PARAMS ((bfd *, enum bfd_architecture, unsigned long));
  77 extern boolean nlmNAME(set_section_contents)
  78      PARAMS ((bfd *, asection *, PTR, file_ptr, bfd_size_type));
  79 extern boolean nlmNAME(write_object_contents)
  80      PARAMS ((bfd *));
  81
  82 /* Some private data is stashed away for future use using the tdata pointer
  83    in the bfd structure.  */
  84
  85 struct nlm_obj_tdata
  86 {
  87   /* Actual data, but ref like ptr */
  88   Nlm_Internal_Fixed_Header     nlm_fixed_hdr[1];
  89   Nlm_Internal_Variable_Header  nlm_variable_hdr[1];
  90   Nlm_Internal_Version_Header   nlm_version_hdr[1];
  91   Nlm_Internal_Copyright_Header nlm_copyright_hdr[1];
  92   Nlm_Internal_Extended_Header  nlm_extended_hdr[1];
  93   Nlm_Internal_Custom_Header    nlm_custom_hdr[1];
  94   /* BFD NLM symbols.  */
  95   nlmNAME(symbol_type)          *nlm_symbols;
  96   /* Lowest text and data VMA values.  */
  97   bfd_vma                       nlm_text_low;
  98   bfd_vma                       nlm_data_low;
  99   /* Caches for data read from object file.  */
 100   arelent *                     nlm_reloc_fixups;
 101   asection **                   nlm_reloc_fixup_secs;
 102   /* Backend specific information.  This should probably be a pointer,
 103      but that would require yet another entry point to initialize the
 104      structure.  */
 105   union
 106     {
 107       struct    /* Alpha backend information.  */
 108         {
 109           bfd_vma gp;                   /* GP value.  */
 110           bfd_vma lita_address;         /* .lita section address.  */
 111           bfd_size_type lita_size;      /* .lita section size.  */
 112         }
 113       alpha_backend_data;
 114     }
 115   backend_data;
 116 };
 117
 118 #define nlm_tdata(bfd)                  ((bfd) -> tdata.nlm_obj_data)
 119 #define nlm_fixed_header(bfd)           (nlm_tdata(bfd) -> nlm_fixed_hdr)
 120 #define nlm_variable_header(bfd)        (nlm_tdata(bfd) -> nlm_variable_hdr)
 121 #define nlm_version_header(bfd)         (nlm_tdata(bfd) -> nlm_version_hdr)
 122 #define nlm_copyright_header(bfd)       (nlm_tdata(bfd) -> nlm_copyright_hdr)
 123 #define nlm_extended_header(bfd)        (nlm_tdata(bfd) -> nlm_extended_hdr)
 124 #define nlm_custom_header(bfd)          (nlm_tdata(bfd) -> nlm_custom_hdr)
 125 #define nlm_get_symbols(bfd)            (nlm_tdata(bfd) -> nlm_symbols)
 126 #define nlm_set_symbols(bfd, p)         (nlm_tdata(bfd) -> nlm_symbols = (p))
 127 #define nlm_set_text_low(bfd, i)        (nlm_tdata(bfd) -> nlm_text_low = (i))
 128 #define nlm_get_text_low(bfd)           (nlm_tdata(bfd) -> nlm_text_low)
 129 #define nlm_set_data_low(bfd, i)        (nlm_tdata(bfd) -> nlm_data_low = (i))
 130 #define nlm_get_data_low(bfd)           (nlm_tdata(bfd) -> nlm_data_low)
 131 #define nlm_relocation_fixups(bfd)      (nlm_tdata(bfd) -> nlm_reloc_fixups)
 132 #define nlm_relocation_fixup_secs(bfd)  (nlm_tdata(bfd)->nlm_reloc_fixup_secs)
 133
 134 #define nlm_alpha_backend_data(bfd) \
 135   (&nlm_tdata (bfd)->backend_data.alpha_backend_data)
 136
 137 /* This is used when writing out the external relocs. */
 138
 139 struct reloc_and_sec
 140 {
 141   arelent *rel;
 142   asection *sec;
 143 };
 144
 145 /* We store some function pointer in the backend structure.  This lets
 146    different NLM targets share most of the same code, while providing
 147    slightly different code where necessary.  */
 148
 149 struct nlm_backend_data
 150 {
 151   /* Signature for this backend.  */
 152   char signature[NLM_SIGNATURE_SIZE];
 153   /* Size of the fixed header.  */
 154   bfd_size_type fixed_header_size;
 155   /* Size of optional prefix for this backend.  Some backend may
 156      require this to be a function, but so far a constant is OK.  This
 157      is for a prefix which precedes the standard NLM fixed header.  */
 158   bfd_size_type optional_prefix_size;
 159   /* Architecture.  */
 160   enum bfd_architecture arch;
 161   /* Machine.  */
 162   long mach;
 163   /* Some NLM formats do not use the uninitialized data section, so
 164      all uninitialized data must be put into the regular data section
 165      instead.  */
 166   boolean no_uninitialized_data;
 167   /* Some NLM formats have a prefix on the file.  If this function is
 168      not NULL, it will be called by nlm_object_p.  It should return
 169      true if this file could match this format, and it should leave
 170      the BFD such that a bfd_read will pick up the fixed header.  */
 171   boolean (*nlm_backend_object_p) PARAMS ((bfd *));
 172   /* Write out the prefix.  This function may be NULL.  This must
 173      write out the same number of bytes as is in the field
 174      optional_prefix_size.  */
 175   boolean (*nlm_write_prefix) PARAMS ((bfd *));
 176   /* Read a relocation fixup from abfd.  The reloc information is
 177      machine specific.  The second argument is the symbol if this is
 178      an import, or NULL if this is a reloc fixup.  This function
 179      should set the third argument to the section which the reloc
 180      belongs in, and the fourth argument to the reloc itself; it does
 181      not need to fill in the sym_ptr_ptr field for a reloc against an
 182      import symbol.  */
 183   boolean (*nlm_read_reloc) PARAMS ((bfd *, nlmNAME(symbol_type) *,
 184                                      asection **, arelent *));
 185   /* To make objcopy to an i386 NLM work, the i386 backend needs a
 186      chance to work over the relocs.  This is a bit icky.  */
 187   boolean (*nlm_mangle_relocs) PARAMS ((bfd *, asection *, PTR data,
 188                                         bfd_vma offset,
 189                                         bfd_size_type count));
 190   /* Read an import record from abfd.  It would be nice if this
 191      were in a machine-dependent format, but it doesn't seem to be. */
 192   boolean (*nlm_read_import) PARAMS ((bfd *, nlmNAME(symbol_type) *));
 193   /* Write an import record to abfd. */
 194   boolean (*nlm_write_import) PARAMS ((bfd *, asection *, arelent *));
 195   /* Set the section for a public symbol.  This may be NULL, in which
 196      case a default method will be used.  */
 197   boolean (*nlm_set_public_section) PARAMS ((bfd *, nlmNAME(symbol_type) *));
 198   /* Get the offset to write out for a public symbol.  This may be
 199      NULL, in which case a default method will be used.  */
 200   bfd_vma (*nlm_get_public_offset) PARAMS ((bfd *, asymbol *));
 201   /* Swap the fixed header in and out */
 202   void (*nlm_swap_fhdr_in) PARAMS ((bfd *,
 203                                     PTR,
 204                                     Nlm_Internal_Fixed_Header *));
 205   void (*nlm_swap_fhdr_out) PARAMS ((bfd *,
 206                                      struct nlm_internal_fixed_header *,
 207                                      PTR));
 208   /* Write out an external reference.  */
 209   boolean (*nlm_write_external) PARAMS ((bfd *, bfd_size_type,
 210                                          asymbol *,
 211                                          struct reloc_and_sec *));
 212   boolean (*nlm_write_export) PARAMS ((bfd *, asymbol *, bfd_vma));
 213 };
 214
 215 #define nlm_backend(bfd) \
 216   ((struct nlm_backend_data *)((bfd) -> xvec -> backend_data))
 217 #define nlm_signature(bfd) \
 218   (nlm_backend(bfd) -> signature)
 219 #define nlm_fixed_header_size(bfd) \
 220   (nlm_backend(bfd) -> fixed_header_size)
 221 #define nlm_optional_prefix_size(bfd) \
 222   (nlm_backend(bfd) -> optional_prefix_size)
 223 #define nlm_architecture(bfd) \
 224   (nlm_backend(bfd) -> arch)
 225 #define nlm_machine(bfd) \
 226   (nlm_backend(bfd) -> mach)
 227 #define nlm_no_uninitialized_data(bfd) \
 228   (nlm_backend(bfd) -> no_uninitialized_data)
 229 #define nlm_backend_object_p_func(bfd) \
 230   (nlm_backend(bfd) -> nlm_backend_object_p)
 231 #define nlm_write_prefix_func(bfd) \
 232   (nlm_backend(bfd) -> nlm_write_prefix)
 233 #define nlm_read_reloc_func(bfd) \
 234   (nlm_backend(bfd) -> nlm_read_reloc)
 235 #define nlm_mangle_relocs_func(bfd) \
 236   (nlm_backend(bfd) -> nlm_mangle_relocs)
 237 #define nlm_read_import_func(bfd) \
 238   (nlm_backend(bfd) -> nlm_read_import)
 239 #define nlm_write_import_func(bfd) \
 240   (nlm_backend(bfd) -> nlm_write_import)
 241 #define nlm_set_public_section_func(bfd) \
 242   (nlm_backend(bfd) -> nlm_set_public_section)
 243 #define nlm_get_public_offset_func(bfd) \
 244   (nlm_backend(bfd) -> nlm_get_public_offset)
 245 #define nlm_swap_fixed_header_in_func(bfd) \
 246   (nlm_backend(bfd) -> nlm_swap_fhdr_in)
 247 #define nlm_swap_fixed_header_out_func(bfd) \
 248   (nlm_backend(bfd) -> nlm_swap_fhdr_out)
 249 #define nlm_write_external_func(bfd) \
 250   (nlm_backend(bfd) -> nlm_write_external)
 251 #define nlm_write_export_func(bfd) \
 252   (nlm_backend(bfd) -> nlm_write_export)
 253
 254 /* The NLM code, data, and uninitialized sections have no names defined
 255    in the NLM, but bfd wants to give them names, so use the traditional
 256    UNIX names.  */
 257
 258 #define NLM_CODE_NAME                   ".text"
 259 #define NLM_INITIALIZED_DATA_NAME       ".data"
 260 #define NLM_UNINITIALIZED_DATA_NAME     ".bss"
 261
 262 #endif /* _LIBNLM_H_ */