gdb/solist.h

   1 /* Shared library declarations for GDB, the GNU Debugger.
   2    Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2000,
   3    2001, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   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 3 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, see <http://www.gnu.org/licenses/>.  */
  19
  20 #ifndef SOLIST_H
  21 #define SOLIST_H
  22
  23 #define SO_NAME_MAX_PATH_SIZE 512       /* FIXME: Should be dynamic */
  24 /* For domain_enum domain.  */
  25 #include "symtab.h"
  26
  27 /* Forward declaration for target specific link map information.  This
  28    struct is opaque to all but the target specific file.  */
  29 struct lm_info;
  30
  31 struct so_list
  32   {
  33     /* The following fields of the structure come directly from the
  34        dynamic linker's tables in the inferior, and are initialized by
  35        current_sos.  */
  36
  37     struct so_list *next;       /* next structure in linked list */
  38
  39     /* A pointer to target specific link map information.  Often this
  40        will be a copy of struct link_map from the user process, but
  41        it need not be; it can be any collection of data needed to
  42        traverse the dynamic linker's data structures.  */
  43     struct lm_info *lm_info;
  44
  45     /* Shared object file name, exactly as it appears in the
  46        inferior's link map.  This may be a relative path, or something
  47        which needs to be looked up in LD_LIBRARY_PATH, etc.  We use it
  48        to tell which entries in the inferior's dynamic linker's link
  49        map we've already loaded.  */
  50     char so_original_name[SO_NAME_MAX_PATH_SIZE];
  51
  52     /* Shared object file name, expanded to something GDB can open.  */
  53     char so_name[SO_NAME_MAX_PATH_SIZE];
  54
  55     /* Program space this shared library belongs to.  */
  56     struct program_space *pspace;
  57
  58     /* The following fields of the structure are built from
  59        information gathered from the shared object file itself, and
  60        are set when we actually add it to our symbol tables.
  61
  62        current_sos must initialize these fields to 0.  */
  63
  64     bfd *abfd;
  65     char symbols_loaded;        /* flag: symbols read in yet?  */
  66
  67     /* objfile with symbols for a loaded library.  Target memory is read from
  68        ABFD.  OBJFILE may be NULL either before symbols have been loaded, if
  69        the file cannot be found or after the command "nosharedlibrary".  */
  70     struct objfile *objfile;
  71
  72     struct target_section *sections;
  73     struct target_section *sections_end;
  74
  75     /* Record the range of addresses belonging to this shared library.
  76        There may not be just one (e.g. if two segments are relocated
  77        differently); but this is only used for "info sharedlibrary".  */
  78     CORE_ADDR addr_low, addr_high;
  79   };
  80
  81 struct target_so_ops
  82   {
  83     /* Adjust the section binding addresses by the base address at
  84        which the object was actually mapped.  */
  85     void (*relocate_section_addresses) (struct so_list *so,
  86                                         struct target_section *);
  87
  88     /* Free the the link map info and any other private data
  89        structures associated with a so_list entry.  */
  90     void (*free_so) (struct so_list *so);
  91
  92     /* Reset or free private data structures not associated with
  93        so_list entries.  */
  94     void (*clear_solib) (void);
  95
  96     /* Target dependent code to run after child process fork.  */
  97     void (*solib_create_inferior_hook) (int from_tty);
  98
  99     /* Do additional symbol handling, lookup, etc. after symbols
 100        for a shared object have been loaded.  */
 101     void (*special_symbol_handling) (void);
 102
 103     /* Construct a list of the currently loaded shared objects.  */
 104     struct so_list *(*current_sos) (void);
 105
 106     /* Find, open, and read the symbols for the main executable.  */
 107     int (*open_symbol_file_object) (void *from_ttyp);
 108
 109     /* Determine if PC lies in the dynamic symbol resolution code of
 110        the run time loader.  */
 111     int (*in_dynsym_resolve_code) (CORE_ADDR pc);
 112
 113     /* Find and open shared library binary file.  */
 114     bfd *(*bfd_open) (char *pathname);
 115
 116     /* Extra hook for finding and opening a solib.
 117        Convenience function for remote debuggers finding host libs.  */
 118     int (*find_and_open_solib) (char *soname,
 119         unsigned o_flags, char **temp_pathname);
 120
 121     /* Hook for looking up global symbols in a library-specific way.  */
 122     struct symbol * (*lookup_lib_global_symbol) (const struct objfile *objfile,
 123                                                  const char *name,
 124                                                  const domain_enum domain);
 125
 126     /* Given two so_list objects, one from the GDB thread list
 127        and another from the list returned by current_sos, return 1
 128        if they represent the same library.
 129        Falls back to using strcmp on so_original_name field when set
 130        to NULL.  */
 131     int (*same) (struct so_list *gdb, struct so_list *inferior);
 132
 133     /* Return whether a region of memory must be kept in a core file
 134        for shared libraries loaded before "gcore" is used to be
 135        handled correctly when the core file is loaded.  This only
 136        applies when the section would otherwise not be kept in the
 137        core file (in particular, for readonly sections).  */
 138     int (*keep_data_in_core) (CORE_ADDR vaddr,
 139                               unsigned long size);
 140   };
 141
 142 /* Free the memory associated with a (so_list *).  */
 143 void free_so (struct so_list *so);
 144
 145 /* Return address of first so_list entry in master shared object list.  */
 146 struct so_list *master_so_list (void);
 147
 148 /* Find shared library binary file.  */
 149 extern char *solib_find (char *in_pathname, int *fd);
 150
 151 /* Open BFD for shared library file.  */
 152 extern bfd *solib_bfd_fopen (char *pathname, int fd);
 153
 154 /* Find solib binary file and open it.  */
 155 extern bfd *solib_bfd_open (char *in_pathname);
 156
 157 /* FIXME: gdbarch needs to control this variable.  */
 158 extern struct target_so_ops *current_target_so_ops;
 159
 160 /* Handler for library-specific global symbol lookup in solib.c.  */
 161 struct symbol *solib_global_lookup (const struct objfile *objfile,
 162                                     const char *name,
 163                                     const domain_enum domain);
 164
 165 #endif