gdb/solist.h

   1 /* Shared library declarations for GDB, the GNU Debugger.
   2    Copyright (C) 1990-2017 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) (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, char **temp_pathname);
 140
 141     /* Hook for looking up global symbols in a library-specific way.  */
 142     struct block_symbol (*lookup_lib_global_symbol)
 143       (struct objfile *objfile,
 144        const char *name,
 145        const domain_enum domain);
 146
 147     /* Given two so_list objects, one from the GDB thread list
 148        and another from the list returned by current_sos, return 1
 149        if they represent the same library.
 150        Falls back to using strcmp on so_original_name field when set
 151        to NULL.  */
 152     int (*same) (struct so_list *gdb, struct so_list *inferior);
 153
 154     /* Return whether a region of memory must be kept in a core file
 155        for shared libraries loaded before "gcore" is used to be
 156        handled correctly when the core file is loaded.  This only
 157        applies when the section would otherwise not be kept in the
 158        core file (in particular, for readonly sections).  */
 159     int (*keep_data_in_core) (CORE_ADDR vaddr,
 160                               unsigned long size);
 161
 162     /* Enable or disable optional solib event breakpoints as
 163        appropriate.  This should be called whenever
 164        stop_on_solib_events is changed.  This pointer can be
 165        NULL, in which case no enabling or disabling is necessary
 166        for this target.  */
 167     void (*update_breakpoints) (void);
 168
 169     /* Target-specific processing of solib events that will be
 170        performed before solib_add is called.  This pointer can be
 171        NULL, in which case no specific preprocessing is necessary
 172        for this target.  */
 173     void (*handle_event) (void);
 174   };
 175
 176 /* Free the memory associated with a (so_list *).  */
 177 void free_so (struct so_list *so);
 178
 179 /* A deleter that calls free_so.  */
 180 struct so_deleter
 181 {
 182   void operator() (struct so_list *so) const
 183   {
 184     free_so (so);
 185   }
 186 };
 187
 188 /* A unique pointer to a so_list.  */
 189 typedef std::unique_ptr<so_list, so_deleter> so_list_up;
 190
 191 /* Return address of first so_list entry in master shared object list.  */
 192 struct so_list *master_so_list (void);
 193
 194 /* Find main executable binary file.  */
 195 extern char *exec_file_find (const char *in_pathname, int *fd);
 196
 197 /* Find shared library binary file.  */
 198 extern char *solib_find (const char *in_pathname, int *fd);
 199
 200 /* Open BFD for shared library file.  */
 201 extern gdb_bfd_ref_ptr solib_bfd_fopen (char *pathname, int fd);
 202
 203 /* Find solib binary file and open it.  */
 204 extern gdb_bfd_ref_ptr solib_bfd_open (char *in_pathname);
 205
 206 /* FIXME: gdbarch needs to control this variable.  */
 207 extern struct target_so_ops *current_target_so_ops;
 208
 209 /* Handler for library-specific global symbol lookup in solib.c.  */
 210 struct block_symbol solib_global_lookup (struct objfile *objfile,
 211                                             const char *name,
 212                                             const domain_enum domain);
 213
 214 #endif