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 finish_default
  85   (void);
  86 extern void set_output_arch_default
  87   (void);
  88 extern void syslib_default
  89   (char*);
  90 extern void hll_default
  91   (char*);
  92 extern int  ldemul_find_potential_libraries
  93   (char *, struct lang_input_statement_struct *);
  94 extern struct bfd_elf_version_expr *ldemul_new_vers_pattern
  95   (struct bfd_elf_version_expr *);
  96
  97 typedef struct ld_emulation_xfer_struct {
  98   /* Run before parsing the command line and script file.
  99      Set the architecture, maybe other things.  */
 100   void   (*before_parse) (void);
 101
 102   /* Handle the SYSLIB (low level library) script command.  */
 103   void   (*syslib) (char *);
 104
 105   /* Handle the HLL (high level library) script command.  */
 106   void   (*hll) (char *);
 107
 108   /* Run after parsing the command line and script file.  */
 109   void   (*after_parse) (void);
 110
 111   /* Run after opening all input files, and loading the symbols.  */
 112   void   (*after_open) (void);
 113
 114   /* Run after allocating output sections.  */
 115   void   (*after_allocation)  (void);
 116
 117   /* Set the output architecture and machine if possible.  */
 118   void   (*set_output_arch) (void);
 119
 120   /* Decide which target name to use.  */
 121   char * (*choose_target) (int, char**);
 122
 123   /* Run before allocating output sections.  */
 124   void   (*before_allocation) (void);
 125
 126   /* Run to set special symbols at the same time as link script syms.  */
 127   void   (*do_assignments) (void);
 128
 129   /* Return the appropriate linker script.  */
 130   char * (*get_script) (int *isfile);
 131
 132   /* The name of this emulation.  */
 133   char *emulation_name;
 134
 135   /* The output format.  */
 136   char *target_name;
 137
 138   /* Run after assigning values from the script.  */
 139   void  (*finish) (void);
 140
 141   /* Create any output sections needed by the target.  */
 142   void  (*create_output_section_statements) (void);
 143
 144   /* Try to open a dynamic library.  ARCH is an architecture name, and
 145      is normally the empty string.  ENTRY is the lang_input_statement
 146      that should be opened.  */
 147   bfd_boolean (*open_dynamic_archive)
 148     (const char *arch, struct search_dirs *,
 149      struct lang_input_statement_struct *entry);
 150
 151   /* Place an orphan section.  Return TRUE if it was placed, FALSE if
 152      the default action should be taken.  This field may be NULL, in
 153      which case the default action will always be taken.  */
 154   bfd_boolean (*place_orphan)
 155     (struct lang_input_statement_struct *, asection *);
 156
 157   /* Run after assigning parsing with the args, but before
 158      reading the script.  Used to initialize symbols used in the script.  */
 159   void  (*set_symbols) (void);
 160
 161   /* Parse args which the base linker doesn't understand.
 162      Return TRUE if the arg needs no further processing.  */
 163   bfd_boolean (*parse_args) (int, char **);
 164
 165   /* Hook to add options to parameters passed by the base linker to
 166      getopt_long and getopt_long_only calls.  */
 167   void (*add_options)
 168     (int, char **, int, struct option **, int, struct option **);
 169
 170   /* Companion to the above to handle an option.  Returns TRUE if it is
 171      one of our options.  */
 172   bfd_boolean (*handle_option) (int);
 173
 174   /* Run to handle files which are not recognized as object files or
 175      archives.  Return TRUE if the file was handled.  */
 176   bfd_boolean (*unrecognized_file)
 177     (struct lang_input_statement_struct *);
 178
 179   /* Run to list the command line options which parse_args handles.  */
 180   void (* list_options) (FILE *);
 181
 182   /* Run to specially handle files which *are* recognized as object
 183      files or archives.  Return TRUE if the file was handled.  */
 184   bfd_boolean (*recognized_file)
 185     (struct lang_input_statement_struct *);
 186
 187   /* Called when looking for libraries in a directory specified
 188      via a linker command line option or linker script option.
 189      Files that match the pattern "lib*.a" have already been scanned.
 190      (For VMS files matching ":lib*.a" have also been scanned).  */
 191   int (* find_potential_libraries)
 192     (char *, struct lang_input_statement_struct *);
 193
 194   /* Called when adding a new version pattern.  PowerPC64-ELF uses
 195      this hook to add a pattern matching ".foo" for every "foo".  */
 196   struct bfd_elf_version_expr * (*new_vers_pattern)
 197     (struct bfd_elf_version_expr *);
 198
 199 } ld_emulation_xfer_type;
 200
 201 typedef enum {
 202   intel_ic960_ld_mode_enum,
 203   default_mode_enum,
 204   intel_gld960_ld_mode_enum
 205 } lang_emulation_mode_enum_type;
 206
 207 extern ld_emulation_xfer_type *ld_emulations[];
 208
 209 #endif