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41bdb6e20c
2001-07-06 Paul Eggert <eggert@twinsun.com> * manual/argp.texi: Remove ignored LGPL copyright notice; it's not appropriate for documentation anyway. * manual/libc-texinfo.sh: "Library General Public License" -> "Lesser General Public License". 2001-07-06 Andreas Jaeger <aj@suse.de> * All files under GPL/LGPL version 2: Place under LGPL version 2.1.
96 lines
3.7 KiB
C
96 lines
3.7 KiB
C
/* Data structure for communication from the run-time dynamic linker for
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loaded ELF shared objects.
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Copyright (C) 1995-1999, 2000 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#ifndef _LINK_H
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#define _LINK_H 1
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#include <features.h>
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#include <elf.h>
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#include <dlfcn.h>
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#include <sys/types.h>
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/* We use this macro to refer to ELF types independent of the native wordsize.
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`ElfW(TYPE)' is used in place of `Elf32_TYPE' or `Elf64_TYPE'. */
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#define ElfW(type) _ElfW (Elf, __ELF_NATIVE_CLASS, type)
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#define _ElfW(e,w,t) _ElfW_1 (e, w, _##t)
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#define _ElfW_1(e,w,t) e##w##t
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#include <bits/elfclass.h> /* Defines __ELF_NATIVE_CLASS. */
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/* Rendezvous structure used by the run-time dynamic linker to communicate
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details of shared object loading to the debugger. If the executable's
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dynamic section has a DT_DEBUG element, the run-time linker sets that
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element's value to the address where this structure can be found. */
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struct r_debug
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{
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int r_version; /* Version number for this protocol. */
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struct link_map *r_map; /* Head of the chain of loaded objects. */
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/* This is the address of a function internal to the run-time linker,
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that will always be called when the linker begins to map in a
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library or unmap it, and again when the mapping change is complete.
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The debugger can set a breakpoint at this address if it wants to
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notice shared object mapping changes. */
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ElfW(Addr) r_brk;
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enum
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{
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/* This state value describes the mapping change taking place when
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the `r_brk' address is called. */
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RT_CONSISTENT, /* Mapping change is complete. */
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RT_ADD, /* Beginning to add a new object. */
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RT_DELETE /* Beginning to remove an object mapping. */
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} r_state;
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ElfW(Addr) r_ldbase; /* Base address the linker is loaded at. */
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};
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/* This is the instance of that structure used by the dynamic linker. */
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extern struct r_debug _r_debug;
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/* This symbol refers to the "dynamic structure" in the `.dynamic' section
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of whatever module refers to `_DYNAMIC'. So, to find its own
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`struct r_debug', a program could do:
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for (dyn = _DYNAMIC; dyn->d_tag != DT_NULL; ++dyn)
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if (dyn->d_tag == DT_DEBUG)
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r_debug = (struct r_debug *) dyn->d_un.d_ptr;
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*/
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extern ElfW(Dyn) _DYNAMIC[];
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/* Structure describing a loaded shared object. The `l_next' and `l_prev'
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members form a chain of all the shared objects loaded at startup.
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These data structures exist in space used by the run-time dynamic linker;
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modifying them may have disastrous results. */
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struct link_map
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{
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/* These first few members are part of the protocol with the debugger.
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This is the same format used in SVR4. */
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ElfW(Addr) l_addr; /* Base address shared object is loaded at. */
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char *l_name; /* Absolute file name object was found in. */
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ElfW(Dyn) *l_ld; /* Dynamic section of the shared object. */
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struct link_map *l_next, *l_prev; /* Chain of loaded objects. */
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};
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#endif /* link.h */
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