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Updated version of ld.so, contains additional functionality and fixes/
design changes required by egcs.

added support for ldconfig/ld.so.hints

changes to low level relocation code, required by egcs pic
code generation that moved global variable loads to before the
self relocation was performed. Only powerpc supported, mips code not updated.

Code cleaned up somewhat reasonably.

This code needs to be reviewed closely for significant problems
such as correctness and security.

/*	$OpenBSD: resolve.h,v 1.1.1.2 2000/06/13 03:40:10 rahnds Exp $ */

/*
 * Copyright (c) 1998 Per Fogelstrom, Opsycon AB
 * 
 * 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, Opsycon AB, Sweden.
 * 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 _RESOLVE_H_
#define _RESOLVE_H_

#include <link.h>


/*
 *  Structure describing a loaded object.
 *  The head of this struct must be compatible
 *  with struct link_map in sys/link.h
 */
typedef struct elf_object {
	Elf32_Addr load_addr;		/* Real load address */
	Elf32_Addr load_offs;		/* Load offset from link address */
	char	   *load_name;		/* Pointer to object name */
	Elf32_Dyn  *load_dyn;		/* Pointer to object dynamic data */
	struct elf_object *next;
	struct elf_object *prev;
/* End struct link_map compatible */

	u_int32_t  load_size;

	union {
		u_int32_t	info[DT_NUM + DT_PROCNUM];
		struct {
			Elf32_Word	null;		/* Not used */
			Elf32_Word	needed;		/* Not used */
			Elf32_Word	pltrelsz;
			Elf32_Word	*pltgot;
			Elf32_Word	*hash;
			const char	*strtab;
			const Elf32_Sym	*symtab;
			Elf32_Rela	*rela;
			Elf32_Word	relasz;
			Elf32_Word	relaent;
			Elf32_Word	strsz;
			Elf32_Word	syment;
			void		(*init)(void);
			void		(*fini)(void);
			const char	*soname;
			const char	*rpath;
			Elf32_Word	symbolic;
			Elf32_Rel	*rel;
			Elf32_Word	relsz;
			Elf32_Word	relent;
			Elf32_Word	pltrel;
			Elf32_Word	debug;
			Elf32_Word	textrel;
			Elf32_Word	jmprel;
			Elf32_Word	bind_now;
		} u;
	} Dyn;
#define dyn Dyn.u

	struct elf_object *dep_next;	/* Shadow objects for resolve search */

	int		status;
#define	STAT_RELOC_DONE	1
#define	STAT_GOT_DONE	2
#define	STAT_INIT_DONE	4

	Elf32_Phdr	*phdrp;
	int		phdrc;

	int		refcount;
	int		obj_type;
#define	OBJTYPE_LDR	1
#define	OBJTYPE_EXE	2
#define	OBJTYPE_LIB	3
#define	OBJTYPE_DLO	4

	u_int32_t	*buckets;
	u_int32_t	nbuckets;
	u_int32_t	*chains;
	u_int32_t	nchains;
	Elf32_Dyn	*dynamic;

} elf_object_t;

extern void _dl_rt_resolve(void);

extern elf_object_t *_dl_add_object(const char *objname, Elf32_Dyn *dynp,
				    const u_int32_t *, const int objtype,
				    const int laddr, const int loff);
extern void         _dl_remove_object(elf_object_t *object);

extern elf_object_t *_dl_lookup_object(const char *objname);
extern elf_object_t *_dl_load_shlib(const char *, elf_object_t *, int);
extern void         _dl_unload_shlib(elf_object_t *object);

extern int  _dl_md_reloc(elf_object_t *object, int rel, int relsz);
extern void _dl_md_reloc_got(elf_object_t *object, int lazy);

Elf32_Addr _dl_find_symbol(const char *name, elf_object_t *startlook,
			const Elf32_Sym **ref, int myself, int warnnotfound);

void * _dl_malloc(const int size);
void  _dl_free(void *);

void _dl_rtld(elf_object_t *object);
void _dl_call_init(elf_object_t *object);

extern elf_object_t *_dl_objects;
extern elf_object_t *_dl_last_object;

extern const char *_dl_progname;
extern struct r_debug *_dl_debug_map;

extern int  _dl_pagesz;
extern int  _dl_trusted;
extern int  _dl_errno;

extern char *_dl_libpath;
extern char *_dl_preload;
extern char *_dl_bindnow;
extern char *_dl_traceld;
extern char *_dl_debug;

#define	DL_NOT_FOUND		1
#define	DL_CANT_OPEN		2
#define	DL_NOT_ELF		3
#define	DL_CANT_OPEN_REF	4
#define	DL_CANT_MMAP		5
#define	DL_NO_SYMBOL		6
#define	DL_INVALID_HANDLE	7
#define	DL_INVALID_CTL		8

#endif /* _RESOLVE_H_ */