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_TTYP dereferences to a non-zero integer, allow messages to
 125        be printed.  This parameter is a pointer rather than an int
 126        because open_symbol_file_object is called via catch_errors and
 127        catch_errors requires a pointer argument.  */
 128     int (*open_symbol_file_object) (void *from_ttyp);
 129
 130     /* Determine if PC lies in the dynamic symbol resolution code of
 131        the run time loader.  */
 132     int (*in_dynsym_resolve_code) (CORE_ADDR pc);
 133
 134     /* Find and open shared library binary file.  */
 135     gdb_bfd_ref_ptr (*bfd_open) (char *pathname);
 136
 137     /* Optional extra hook for finding and opening a solib.
 138        If TEMP_PATHNAME is non-NULL: If the file is successfully opened a
 139        pointer to a malloc'd and realpath'd copy of SONAME is stored there,
 140        otherwise NULL is stored there.  */
 141     int (*find_and_open_solib) (const char *soname,
 142         unsigned o_flags, char **temp_pathname);
 143
 144     /* Hook for looking up global symbols in a library-specific way.  */
 145     struct block_symbol (*lookup_lib_global_symbol)
 146       (struct objfile *objfile,
 147        const char *name,
 148        const domain_enum domain);
 149
 150     /* Given two so_list objects, one from the GDB thread list
 151        and another from the list returned by current_sos, return 1
 152        if they represent the same library.
 153        Falls back to using strcmp on so_original_name field when set
 154        to NULL.  */
 155     int (*same) (struct so_list *gdb, struct so_list *inferior);
 156
 157     /* Return whether a region of memory must be kept in a core file
 158        for shared libraries loaded before "gcore" is used to be
 159        handled correctly when the core file is loaded.  This only
 160        applies when the section would otherwise not be kept in the
 161        core file (in particular, for readonly sections).  */
 162     int (*keep_data_in_core) (CORE_ADDR vaddr,
 163                               unsigned long size);
 164
 165     /* Enable or disable optional solib event breakpoints as
 166        appropriate.  This should be called whenever
 167        stop_on_solib_events is changed.  This pointer can be
 168        NULL, in which case no enabling or disabling is necessary
 169        for this target.  */
 170     void (*update_breakpoints) (void);
 171
 172     /* Target-specific processing of solib events that will be
 173        performed before solib_add is called.  This pointer can be
 174        NULL, in which case no specific preprocessing is necessary
 175        for this target.  */
 176     void (*handle_event) (void);
 177   };
 178
 179 /* Free the memory associated with a (so_list *).  */
 180 void free_so (struct so_list *so);
 181
 182 /* Return address of first so_list entry in master shared object list.  */
 183 struct so_list *master_so_list (void);
 184
 185 /* Find main executable binary file.  */
 186 extern char *exec_file_find (const char *in_pathname, int *fd);
 187
 188 /* Find shared library binary file.  */
 189 extern char *solib_find (const char *in_pathname, int *fd);
 190
 191 /* Open BFD for shared library file.  */
 192 extern gdb_bfd_ref_ptr solib_bfd_fopen (char *pathname, int fd);
 193
 194 /* Find solib binary file and open it.  */
 195 extern gdb_bfd_ref_ptr solib_bfd_open (char *in_pathname);
 196
 197 /* FIXME: gdbarch needs to control this variable.  */
 198 extern struct target_so_ops *current_target_so_ops;
 199
 200 /* Handler for library-specific global symbol lookup in solib.c.  */
 201 struct block_symbol solib_global_lookup (struct objfile *objfile,
 202                                             const char *name,
 203                                             const domain_enum domain);
 204
 205 #endif