gdb/solib-svr4.h

/* Handle shared libraries for GDB, the GNU Debugger.

   Copyright (C) 2000-2016 Free Software Foundation, Inc.

   This file is part of GDB.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

#ifndef SOLIB_SVR4_H
#define SOLIB_SVR4_H

struct objfile;
struct target_so_ops;

extern struct target_so_ops svr4_so_ops;

/* Critical offsets and sizes which describe struct r_debug and
   struct link_map on SVR4-like targets.  All offsets and sizes are
   in bytes unless otherwise specified.  */

struct link_map_offsets
  {
    /* Offset and size of r_debug.r_version.  */
    int r_version_offset, r_version_size;

    /* Offset of r_debug.r_map.  */
    int r_map_offset;

    /* Offset of r_debug.r_brk.  */
    int r_brk_offset;

    /* Offset of r_debug.r_ldsomap.  */
    int r_ldsomap_offset;

    /* Size of struct link_map (or equivalent), or at least enough of it
       to be able to obtain the fields below.  */
    int link_map_size;

    /* Offset to l_addr field in struct link_map.  */
    int l_addr_offset;

    /* Offset to l_ld field in struct link_map.  */
    int l_ld_offset;

    /* Offset to l_next field in struct link_map.  */
    int l_next_offset;

    /* Offset to l_prev field in struct link_map.  */
    int l_prev_offset;

    /* Offset to l_name field in struct link_map.  */
    int l_name_offset;
  };

/* set_solib_svr4_fetch_link_map_offsets() is intended to be called by
   a <arch>_gdbarch_init() function.  It is used to establish an
   architecture specific link_map_offsets fetcher for the architecture
   being defined.  */

extern void set_solib_svr4_fetch_link_map_offsets
  (struct gdbarch *gdbarch, struct link_map_offsets *(*func) (void));

/* This function is called by thread_db.c.  Return the address of the
   link map for the given objfile.  */
extern CORE_ADDR svr4_fetch_objfile_link_map (struct objfile *objfile);

/* Fetch (and possibly build) an appropriate `struct link_map_offsets'
   for ILP32 and LP64 SVR4 systems.  */
extern struct link_map_offsets *svr4_ilp32_fetch_link_map_offsets (void);
extern struct link_map_offsets *svr4_lp64_fetch_link_map_offsets (void);

/* Return 1 if PC lies in the dynamic symbol resolution code of the
   SVR4 run time loader.  */
int svr4_in_dynsym_resolve_code (CORE_ADDR pc);

/* Implement the "create_inferior_hook" target_solib_ops method.  */
extern void svr4_solib_create_inferior_hook (int from_tty);

/* Relocate the main executable.  This function should be called upon
   stopping the inferior process at the entry point to the program.
   The entry point from BFD is compared to the AT_ENTRY of AUXV and if they are
   different, the main executable is relocated by the proper amount.  */
extern void svr4_relocate_main_executable (void);

/* Apply the PIE displacement DISPLACEMENT to the main executable.  */
extern void svr4_apply_exec_displacement (CORE_ADDR displacement);

#endif /* solib-svr4.h */