ld/ldemul.h

   1 /* ld-emul.h - Linker emulation header file
   2    Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 2000, 2001,
   3    2002, 2003, 2004, 2005
   4    Free Software Foundation, Inc.
   5
   6    This file is part of GLD, the Gnu Linker.
   7
   8    GLD is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 1, or (at your option)
  11    any later version.
  12
  13    GLD is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.  */
  17
  18 #ifndef LDEMUL_H
  19 #define LDEMUL_H
  20
  21 /* Forward declaration for ldemul_add_options() and others.  */
  22 struct option;
  23
  24 extern void ldemul_hll
  25   (char *);
  26 extern void ldemul_syslib
  27   (char *);
  28 extern void ldemul_after_parse
  29   (void);
  30 extern void ldemul_before_parse
  31   (void);
  32 extern void ldemul_after_open
  33   (void);
  34 extern void ldemul_after_allocation
  35   (void);
  36 extern void ldemul_before_allocation
  37   (void);
  38 extern void ldemul_do_assignments
  39   (void);
  40 extern void ldemul_set_output_arch
  41   (void);
  42 extern char *ldemul_choose_target
  43   (int, char**);
  44 extern void ldemul_choose_mode
  45   (char *);
  46 extern void ldemul_list_emulations
  47   (FILE *);
  48 extern void ldemul_list_emulation_options
  49   (FILE *);
  50 extern char *ldemul_get_script
  51   (int *isfile);
  52 extern void ldemul_finish
  53   (void);
  54 extern void ldemul_set_symbols
  55   (void);
  56 extern void ldemul_create_output_section_statements
  57   (void);
  58 extern bfd_boolean ldemul_place_orphan
  59   (struct lang_input_statement_struct *, asection *);
  60 extern bfd_boolean ldemul_parse_args
  61   (int, char **);
  62 extern void ldemul_add_options
  63   (int, char **, int, struct option **, int, struct option **);
  64 extern bfd_boolean ldemul_handle_option
  65   (int);
  66 extern bfd_boolean ldemul_unrecognized_file
  67   (struct lang_input_statement_struct *);
  68 extern bfd_boolean ldemul_recognized_file
  69   (struct lang_input_statement_struct *);
  70 extern bfd_boolean ldemul_open_dynamic_archive
  71   (const char *, struct search_dirs *, struct lang_input_statement_struct *);
  72 extern char *ldemul_default_target
  73   (int, char**);
  74 extern void after_parse_default
  75   (void);
  76 extern void after_open_default
  77   (void);
  78 extern void after_allocation_default
  79   (void);
  80 extern void before_allocation_default
  81   (void);
  82 extern void do_assignments_default
  83   (void);
  84 extern void set_output_arch_default
  85   (void);
  86 extern void syslib_default
  87   (char*);
  88 extern void hll_default
  89   (char*);
  90 extern int  ldemul_find_potential_libraries
  91   (char *, struct lang_input_statement_struct *);
  92 extern struct bfd_elf_version_expr *ldemul_new_vers_pattern
  93   (struct bfd_elf_version_expr *);
  94
  95 typedef struct ld_emulation_xfer_struct {
  96   /* Run before parsing the command line and script file.
  97      Set the architecture, maybe other things.  */
  98   void   (*before_parse) (void);
  99
 100   /* Handle the SYSLIB (low level library) script command.  */
 101   void   (*syslib) (char *);
 102
 103   /* Handle the HLL (high level library) script command.  */
 104   void   (*hll) (char *);
 105
 106   /* Run after parsing the command line and script file.  */
 107   void   (*after_parse) (void);
 108
 109   /* Run after opening all input files, and loading the symbols.  */
 110   void   (*after_open) (void);
 111
 112   /* Run after allocating output sections.  */
 113   void   (*after_allocation)  (void);
 114
 115   /* Set the output architecture and machine if possible.  */
 116   void   (*set_output_arch) (void);
 117
 118   /* Decide which target name to use.  */
 119   char * (*choose_target) (int, char**);
 120
 121   /* Run before allocating output sections.  */
 122   void   (*before_allocation) (void);
 123
 124   /* Run to set special symbols at the same time as link script syms.  */
 125   void   (*do_assignments) (void);
 126
 127   /* Return the appropriate linker script.  */
 128   char * (*get_script) (int *isfile);
 129
 130   /* The name of this emulation.  */
 131   char *emulation_name;
 132
 133   /* The output format.  */
 134   char *target_name;
 135
 136   /* Run after assigning values from the script.  */
 137   void  (*finish) (void);
 138
 139   /* Create any output sections needed by the target.  */
 140   void  (*create_output_section_statements) (void);
 141
 142   /* Try to open a dynamic library.  ARCH is an architecture name, and
 143      is normally the empty string.  ENTRY is the lang_input_statement
 144      that should be opened.  */
 145   bfd_boolean (*open_dynamic_archive)
 146     (const char *arch, struct search_dirs *,
 147      struct lang_input_statement_struct *entry);
 148
 149   /* Place an orphan section.  Return TRUE if it was placed, FALSE if
 150      the default action should be taken.  This field may be NULL, in
 151      which case the default action will always be taken.  */
 152   bfd_boolean (*place_orphan)
 153     (struct lang_input_statement_struct *, asection *);
 154
 155   /* Run after assigning parsing with the args, but before
 156      reading the script.  Used to initialize symbols used in the script.  */
 157   void  (*set_symbols) (void);
 158
 159   /* Parse args which the base linker doesn't understand.
 160      Return TRUE if the arg needs no further processing.  */
 161   bfd_boolean (*parse_args) (int, char **);
 162
 163   /* Hook to add options to parameters passed by the base linker to
 164      getopt_long and getopt_long_only calls.  */
 165   void (*add_options)
 166     (int, char **, int, struct option **, int, struct option **);
 167
 168   /* Companion to the above to handle an option.  Returns TRUE if it is
 169      one of our options.  */
 170   bfd_boolean (*handle_option) (int);
 171
 172   /* Run to handle files which are not recognized as object files or
 173      archives.  Return TRUE if the file was handled.  */
 174   bfd_boolean (*unrecognized_file)
 175     (struct lang_input_statement_struct *);
 176
 177   /* Run to list the command line options which parse_args handles.  */
 178   void (* list_options) (FILE *);
 179
 180   /* Run to specially handle files which *are* recognized as object
 181      files or archives.  Return TRUE if the file was handled.  */
 182   bfd_boolean (*recognized_file)
 183     (struct lang_input_statement_struct *);
 184
 185   /* Called when looking for libraries in a directory specified
 186      via a linker command line option or linker script option.
 187      Files that match the pattern "lib*.a" have already been scanned.
 188      (For VMS files matching ":lib*.a" have also been scanned).  */
 189   int (* find_potential_libraries)
 190     (char *, struct lang_input_statement_struct *);
 191
 192   /* Called when adding a new version pattern.  PowerPC64-ELF uses
 193      this hook to add a pattern matching ".foo" for every "foo".  */
 194   struct bfd_elf_version_expr * (*new_vers_pattern)
 195     (struct bfd_elf_version_expr *);
 196
 197 } ld_emulation_xfer_type;
 198
 199 typedef enum {
 200   intel_ic960_ld_mode_enum,
 201   default_mode_enum,
 202   intel_gld960_ld_mode_enum
 203 } lang_emulation_mode_enum_type;
 204
 205 extern ld_emulation_xfer_type *ld_emulations[];
 206
 207 #endif