gdb/solist.h

   1 /* Shared library declarations for GDB, the GNU Debugger.
   2    Copyright (C) 1990-2018 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
  27 #define ALL_SO_LIBS(so) \
  28     for (so = so_list_head; \
  29          so != NULL; \
  30          so = so->next)
  31
  32 /* Base class for target-specific link map information.  */
  33
  34 struct lm_info_base
  35 {
  36 };
  37
  38 struct so_list
  39 {
  40   /* The following fields of the structure come directly from the
  41      dynamic linker's tables in the inferior, and are initialized by
  42      current_sos.  */
  43
  44   struct so_list *next; /* next structure in linked list */
  45
  46   /* A pointer to target specific link map information.  Often this
  47      will be a copy of struct link_map from the user process, but
  48      it need not be; it can be any collection of data needed to
  49      traverse the dynamic linker's data structures.  */
  50   lm_info_base *lm_info;
  51
  52   /* Shared object file name, exactly as it appears in the
  53      inferior's link map.  This may be a relative path, or something
  54      which needs to be looked up in LD_LIBRARY_PATH, etc.  We use it
  55      to tell which entries in the inferior's dynamic linker's link
  56      map we've already loaded.  */
  57   char so_original_name[SO_NAME_MAX_PATH_SIZE];
  58
  59   /* Shared object file name, expanded to something GDB can open.  */
  60   char so_name[SO_NAME_MAX_PATH_SIZE];
  61
  62   /* Program space this shared library belongs to.  */
  63   struct program_space *pspace;
  64
  65   /* The following fields of the structure are built from
  66      information gathered from the shared object file itself, and
  67      are set when we actually add it to our symbol tables.
  68
  69      current_sos must initialize these fields to 0.  */
  70
  71   bfd *abfd;
  72   char symbols_loaded;  /* flag: symbols read in yet?  */
  73
  74   /* objfile with symbols for a loaded library.  Target memory is read from
  75      ABFD.  OBJFILE may be NULL either before symbols have been loaded, if
  76      the file cannot be found or after the command "nosharedlibrary".  */
  77   struct objfile *objfile;
  78
  79   struct target_section *sections;
  80   struct target_section *sections_end;
  81
  82   /* Record the range of addresses belonging to this shared library.
  83      There may not be just one (e.g. if two segments are relocated
  84      differently).  This is used for "info sharedlibrary" and
  85      the MI command "-file-list-shared-libraries".  The latter has a format
  86      that supports outputting multiple segments once the related code
  87      supports them.  */
  88   CORE_ADDR addr_low, addr_high;
  89 };
  90
  91 struct target_so_ops
  92 {
  93   /* Adjust the section binding addresses by the base address at
  94      which the object was actually mapped.  */
  95   void (*relocate_section_addresses) (struct so_list *so,
  96                                       struct target_section *);
  97
  98   /* Free the link map info and any other private data structures
  99      associated with a so_list entry.  */
 100   void (*free_so) (struct so_list *so);
 101
 102   /* Reset private data structures associated with SO.
 103      This is called when SO is about to be reloaded.
 104      It is also called before free_so when SO is about to be freed.  */
 105   void (*clear_so) (struct so_list *so);
 106
 107   /* Reset or free private data structures not associated with
 108      so_list entries.  */
 109   void (*clear_solib) (void);
 110
 111   /* Target dependent code to run after child process fork.  */
 112   void (*solib_create_inferior_hook) (int from_tty);
 113
 114   /* Construct a list of the currently loaded shared objects.  This
 115      list does not include an entry for the main executable file.
 116
 117      Note that we only gather information directly available from the
 118      inferior --- we don't examine any of the shared library files
 119      themselves.  The declaration of `struct so_list' says which fields
 120      we provide values for.  */
 121   struct so_list *(*current_sos) (void);
 122
 123   /* Find, open, and read the symbols for the main executable.  If
 124      FROM_TTY is non-zero, allow messages to be printed.  */
 125   int (*open_symbol_file_object) (int from_ttyp);
 126
 127   /* Determine if PC lies in the dynamic symbol resolution code of
 128      the run time loader.  */
 129   int (*in_dynsym_resolve_code) (CORE_ADDR pc);
 130
 131   /* Find and open shared library binary file.  */
 132   gdb_bfd_ref_ptr (*bfd_open) (const char *pathname);
 133
 134   /* Optional extra hook for finding and opening a solib.
 135      If TEMP_PATHNAME is non-NULL: If the file is successfully opened a
 136      pointer to a malloc'd and realpath'd copy of SONAME is stored there,
 137      otherwise NULL is stored there.  */
 138   int (*find_and_open_solib) (const char *soname,
 139                               unsigned o_flags,
 140                               gdb::unique_xmalloc_ptr<char> *temp_pathname);
 141
 142   /* Hook for looking up global symbols in a library-specific way.  */
 143   struct block_symbol (*lookup_lib_global_symbol)
 144     (struct objfile *objfile,
 145      const char *name,
 146      const domain_enum domain);
 147
 148   /* Given two so_list objects, one from the GDB thread list
 149      and another from the list returned by current_sos, return 1
 150      if they represent the same library.
 151      Falls back to using strcmp on so_original_name field when set
 152      to NULL.  */
 153   int (*same) (struct so_list *gdb, struct so_list *inferior);
 154
 155   /* Return whether a region of memory must be kept in a core file
 156      for shared libraries loaded before "gcore" is used to be
 157      handled correctly when the core file is loaded.  This only
 158      applies when the section would otherwise not be kept in the
 159      core file (in particular, for readonly sections).  */
 160   int (*keep_data_in_core) (CORE_ADDR vaddr,
 161                             unsigned long size);
 162
 163   /* Enable or disable optional solib event breakpoints as
 164      appropriate.  This should be called whenever
 165      stop_on_solib_events is changed.  This pointer can be
 166      NULL, in which case no enabling or disabling is necessary
 167      for this target.  */
 168   void (*update_breakpoints) (void);
 169
 170   /* Target-specific processing of solib events that will be
 171      performed before solib_add is called.  This pointer can be
 172      NULL, in which case no specific preprocessing is necessary
 173      for this target.  */
 174   void (*handle_event) (void);
 175 };
 176
 177 /* Free the memory associated with a (so_list *).  */
 178 void free_so (struct so_list *so);
 179
 180 /* A deleter that calls free_so.  */
 181 struct so_deleter
 182 {
 183   void operator() (struct so_list *so) const
 184   {
 185     free_so (so);
 186   }
 187 };
 188
 189 /* A unique pointer to a so_list.  */
 190 typedef std::unique_ptr<so_list, so_deleter> so_list_up;
 191
 192 /* Return address of first so_list entry in master shared object list.  */
 193 struct so_list *master_so_list (void);
 194
 195 /* Find main executable binary file.  */
 196 extern gdb::unique_xmalloc_ptr<char> exec_file_find (const char *in_pathname,
 197                                                      int *fd);
 198
 199 /* Find shared library binary file.  */
 200 extern gdb::unique_xmalloc_ptr<char> solib_find (const char *in_pathname,
 201                                                  int *fd);
 202
 203 /* Open BFD for shared library file.  */
 204 extern gdb_bfd_ref_ptr solib_bfd_fopen (const char *pathname, int fd);
 205
 206 /* Find solib binary file and open it.  */
 207 extern gdb_bfd_ref_ptr solib_bfd_open (const char *in_pathname);
 208
 209 /* FIXME: gdbarch needs to control this variable.  */
 210 extern struct target_so_ops *current_target_so_ops;
 211
 212 /* Handler for library-specific global symbol lookup in solib.c.  */
 213 struct block_symbol solib_global_lookup (struct objfile *objfile,
 214                                             const char *name,
 215                                             const domain_enum domain);
 216
 217 #endif