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/* $OpenBSD: link.h,v 1.2 1997/07/31 15:42:28 pefo Exp $ */
/*
* Copyright (c) 1996 Per Fogelstrom
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed under OpenBSD by
* Per Fogelstrom.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
#ifndef _LINK_H
#define _LINK_H 1
#include <elf_abi.h>
#include <machine/elf_abi.h>
/*
* Debug rendezvous struct. Pointer to this is set up in the
* target code pointed by the DT_MIPS_RLD_MAP tag. If it is
* defined.
*/
struct r_debug {
int r_version; /* Protocol version. */
struct link_map *r_map; /* Head of list of loaded objects. */
/* This is the address of a function internal to the run-time linker,
that will always be called when the linker begins to map in a
library or unmap it, and again when the mapping change is complete.
The debugger can set a breakpoint at this address if it wants to
notice shared object mapping changes. */
Elf32_Addr r_brk;
enum {
/* This state value describes the mapping change taking place when
the `r_brk' address is called. */
RT_CONSISTENT, /* Mapping change is complete. */
RT_ADD, /* Adding a new object. */
RT_DELETE, /* Removing an object mapping. */
} r_state;
Elf32_Addr r_ldbase; /* Base address the linker is loaded at. */
};
/* This symbol refers to the "dynamic structure" in the `.dynamic' section
of whatever module refers to `_DYNAMIC'. So, to find its own
`struct r_debug', a program could do:
for (dyn = _DYNAMIC; dyn->d_tag != DT_NULL)
if (dyn->d_tag == DT_MIPS_RLD_MAP) r_debug = (struct r_debug) dyn->d_un.d_ptr;
*/
extern Elf32_Dyn _DYNAMIC[];
/* Structure describing a loaded shared object. The `l_next' and `l_prev'
members form a chain of all the shared objects loaded at startup.
These data structures exist in space used by the run-time dynamic linker;
modifying them may have disastrous results. */
struct link_map
{
/* These first few members are part of the protocol with the debugger.
This is the same format used in SVR4. */
Elf32_Addr l_addr; /* Base address shared object is loaded at. */
Elf32_Addr l_offs; /* Offset */
char *l_name; /* Absolute file name object was found in. */
Elf32_Dyn *l_ld; /* Dynamic section of the shared object. */
struct link_map *l_next, *l_prev; /* Chain of loaded objects. */
/* All following members are internal to the dynamic linker.
They may change without notice. */
const char *l_libname; /* Name requested (before search). */
/* Indexed pointers to dynamic section. */
Elf32_Dyn *l_info[DT_NUM + DT_PROCNUM];
const Elf32_Phdr *l_phdr; /* Pointer to program header table in core. */
Elf32_Word l_phnum; /* Number of program header entries. */
Elf32_Addr l_entry; /* Entry point location. */
/* Symbol hash table. */
Elf32_Word l_nbuckets;
const Elf32_Word *l_buckets, *l_chain;
unsigned int l_opencount; /* Reference count for dlopen/dlclose. */
enum /* Where this object came from. */
{
lt_executable, /* The main executable program. */
lt_interpreter, /* The interpreter: the dynamic linker. */
lt_library, /* Library needed by main executable. */
lt_loaded, /* Extra run-time loaded shared object. */
} l_type:2;
unsigned int l_deps_loaded:1; /* Nonzero if DT_NEEDED items loaded. */
unsigned int l_relocated:1; /* Nonzero if object's relocations done. */
unsigned int l_init_called:1; /* Nonzero if DT_INIT function called. */
unsigned int l_init_running:1; /* Nonzero while DT_INIT function runs. */
};
#endif /* _LINK_H */
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