gdb/solist.h

   1 /* Shared library declarations for GDB, the GNU Debugger.
   2    Copyright (C) 1990-2022 Free Software Foundation, Inc.
   3
   4    This file is part of GDB.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  18
  19 #ifndef SOLIST_H
  20 #define SOLIST_H
  21
  22 #define SO_NAME_MAX_PATH_SIZE 512       /* FIXME: Should be dynamic */
  23 /* For domain_enum domain.  */
  24 #include "symtab.h"
  25 #include "gdb_bfd.h"
  26 #include "target-section.h"
  27
  28 /* Base class for target-specific link map information.  */
  29
  30 struct lm_info_base
  31 {
  32 };
  33
  34 struct so_list
  35 {
  36   /* The following fields of the structure come directly from the
  37      dynamic linker's tables in the inferior, and are initialized by
  38      current_sos.  */
  39
  40   struct so_list *next; /* next structure in linked list */
  41
  42   /* A pointer to target specific link map information.  Often this
  43      will be a copy of struct link_map from the user process, but
  44      it need not be; it can be any collection of data needed to
  45      traverse the dynamic linker's data structures.  */
  46   lm_info_base *lm_info;
  47
  48   /* Shared object file name, exactly as it appears in the
  49      inferior's link map.  This may be a relative path, or something
  50      which needs to be looked up in LD_LIBRARY_PATH, etc.  We use it
  51      to tell which entries in the inferior's dynamic linker's link
  52      map we've already loaded.  */
  53   char so_original_name[SO_NAME_MAX_PATH_SIZE];
  54
  55   /* Shared object file name, expanded to something GDB can open.  */
  56   char so_name[SO_NAME_MAX_PATH_SIZE];
  57
  58   /* Program space this shared library belongs to.  */
  59   struct program_space *pspace;
  60
  61   /* The following fields of the structure are built from
  62      information gathered from the shared object file itself, and
  63      are set when we actually add it to our symbol tables.
  64
  65      current_sos must initialize these fields to 0.  */
  66
  67   bfd *abfd;
  68   char symbols_loaded;  /* flag: symbols read in yet?  */
  69
  70   /* objfile with symbols for a loaded library.  Target memory is read from
  71      ABFD.  OBJFILE may be NULL either before symbols have been loaded, if
  72      the file cannot be found or after the command "nosharedlibrary".  */
  73   struct objfile *objfile;
  74
  75   target_section_table *sections;
  76
  77   /* Record the range of addresses belonging to this shared library.
  78      There may not be just one (e.g. if two segments are relocated
  79      differently).  This is used for "info sharedlibrary" and
  80      the MI command "-file-list-shared-libraries".  The latter has a format
  81      that supports outputting multiple segments once the related code
  82      supports them.  */
  83   CORE_ADDR addr_low, addr_high;
  84 };
  85
  86 struct target_so_ops
  87 {
  88   /* Adjust the section binding addresses by the base address at
  89      which the object was actually mapped.  */
  90   void (*relocate_section_addresses) (struct so_list *so,
  91                                       struct target_section *);
  92
  93   /* Free the link map info and any other private data structures
  94      associated with a so_list entry.  */
  95   void (*free_so) (struct so_list *so);
  96
  97   /* Reset private data structures associated with SO.
  98      This is called when SO is about to be reloaded.
  99      It is also called before free_so when SO is about to be freed.  */
 100   void (*clear_so) (struct so_list *so);
 101
 102   /* Reset or free private data structures not associated with
 103      so_list entries.  */
 104   void (*clear_solib) (void);
 105
 106   /* Target dependent code to run after child process fork.  */
 107   void (*solib_create_inferior_hook) (int from_tty);
 108
 109   /* Construct a list of the currently loaded shared objects.  This
 110      list does not include an entry for the main executable file.
 111
 112      Note that we only gather information directly available from the
 113      inferior --- we don't examine any of the shared library files
 114      themselves.  The declaration of `struct so_list' says which fields
 115      we provide values for.  */
 116   struct so_list *(*current_sos) (void);
 117
 118   /* Find, open, and read the symbols for the main executable.  If
 119      FROM_TTY is non-zero, allow messages to be printed.  */
 120   int (*open_symbol_file_object) (int from_ttyp);
 121
 122   /* Determine if PC lies in the dynamic symbol resolution code of
 123      the run time loader.  */
 124   int (*in_dynsym_resolve_code) (CORE_ADDR pc);
 125
 126   /* Find and open shared library binary file.  */
 127   gdb_bfd_ref_ptr (*bfd_open) (const char *pathname);
 128
 129   /* Optional extra hook for finding and opening a solib.
 130      If TEMP_PATHNAME is non-NULL: If the file is successfully opened a
 131      pointer to a malloc'd and realpath'd copy of SONAME is stored there,
 132      otherwise NULL is stored there.  */
 133   int (*find_and_open_solib) (const char *soname,
 134                               unsigned o_flags,
 135                               gdb::unique_xmalloc_ptr<char> *temp_pathname);
 136
 137   /* Given two so_list objects, one from the GDB thread list
 138      and another from the list returned by current_sos, return 1
 139      if they represent the same library.
 140      Falls back to using strcmp on so_original_name field when set
 141      to NULL.  */
 142   int (*same) (struct so_list *gdb, struct so_list *inferior);
 143
 144   /* Return whether a region of memory must be kept in a core file
 145      for shared libraries loaded before "gcore" is used to be
 146      handled correctly when the core file is loaded.  This only
 147      applies when the section would otherwise not be kept in the
 148      core file (in particular, for readonly sections).  */
 149   int (*keep_data_in_core) (CORE_ADDR vaddr,
 150                             unsigned long size);
 151
 152   /* Enable or disable optional solib event breakpoints as
 153      appropriate.  This should be called whenever
 154      stop_on_solib_events is changed.  This pointer can be
 155      NULL, in which case no enabling or disabling is necessary
 156      for this target.  */
 157   void (*update_breakpoints) (void);
 158
 159   /* Target-specific processing of solib events that will be
 160      performed before solib_add is called.  This pointer can be
 161      NULL, in which case no specific preprocessing is necessary
 162      for this target.  */
 163   void (*handle_event) (void);
 164 };
 165
 166 using so_list_range = next_range<so_list>;
 167
 168 /* Free the memory associated with a (so_list *).  */
 169 void free_so (struct so_list *so);
 170
 171 /* A deleter that calls free_so.  */
 172 struct so_deleter
 173 {
 174   void operator() (struct so_list *so) const
 175   {
 176     free_so (so);
 177   }
 178 };
 179
 180 /* A unique pointer to a so_list.  */
 181 typedef std::unique_ptr<so_list, so_deleter> so_list_up;
 182
 183 /* Find main executable binary file.  */
 184 extern gdb::unique_xmalloc_ptr<char> exec_file_find (const char *in_pathname,
 185                                                      int *fd);
 186
 187 /* Find shared library binary file.  */
 188 extern gdb::unique_xmalloc_ptr<char> solib_find (const char *in_pathname,
 189                                                  int *fd);
 190
 191 /* Open BFD for shared library file.  */
 192 extern gdb_bfd_ref_ptr solib_bfd_fopen (const char *pathname, int fd);
 193
 194 /* Find solib binary file and open it.  */
 195 extern gdb_bfd_ref_ptr solib_bfd_open (const char *in_pathname);
 196
 197 /* FIXME: gdbarch needs to control this variable.  */
 198 extern struct target_so_ops *current_target_so_ops;
 199
 200 #endif