xref: /illumos-gate/usr/src/cmd/sgs/librtld/common/_librtld.h (revision 2a8bcb4efb45d99ac41c94a75c396b362c414f7f)

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#ifndef	__LIBRTLD_H
#define	__LIBRTLD_H

#include <libelf.h>
#include <rtld.h>
#include <machdep.h>

#ifdef	__cplusplus
extern "C" {
#endif


/*
 * Define a cache structure that is used to retain all elf section information.
 */
typedef struct cache {
	int		c_flags;
	Elf_Scn		*c_scn;
	Shdr		*c_shdr;
	Elf_Data	*c_data;
	char		*c_name;
	void		*c_info;
} Cache;

#define	FLG_C_EXCLUDE	1		/* exclude section from output image */
#define	FLG_C_HEAP	2		/* heap section (addition) */
#define	FLG_C_RELOC	3		/* relocation section requiring */
					/*	modification */
#define	FLG_C_SHSTR	4		/* section header string table */
#define	FLG_C_END	5		/* null terminating section marker */


/*
 * Define a structure for maintaining relocation information.  During the first
 * pass through an input files relocation records, counts are maintained of the
 * number of relocations to recreate in the output image.  The intent is to
 * localize any remaining relocation records.  The relocation structure
 * indicates the actions that must be performed on the output images relocation
 * information.
 */
typedef struct reloc {
	int		r_flags;
	Xword		r_pltndx;	/* pltndx if a JMP relocation */
	Addr		r_value;	/* value to apply to relocation */
	unsigned long	r_size;		/* size (used for copy relocations) */
	const char	*r_name;		/* relocation symbol */
} Reloc;

#define	FLG_R_UNDO	0x01		/* undo any relocation offset value */
#define	FLG_R_CLR	0x02		/* clear the relocation record */
#define	FLG_R_INC	0x04		/* increment the relocation offset */
					/*	(uses new fixed addr) */
#define	FLG_R_APPLY	0x08		/* apply the relocation */


/*
 * Define any local prototypes.
 */
extern	void	apply_reloc(void *, Reloc *, const char *, uchar_t *, Rt_map *);
extern	void	clear_reloc(void *);
extern	int	count_reloc(Cache *, Cache *, Rt_map *, int, Addr, Xword *,
		    Xword *, Xword *, Alist *);
extern	void	inc_reloc(void *, void *, Reloc *, uchar_t *, uchar_t *);
extern	int	syminfo(Cache *, Alist **);
extern	void	undo_reloc(void *, uchar_t *, uchar_t *, Reloc *);
extern	int	update_dynamic(Cache *, Cache *, Rt_map *, int, Addr, Off,
		    const char *, Xword, Xword, Xword, Xword, Xword);
extern	void	update_reloc(Cache *, Cache *, Cache *, const char *,
		    Rt_map *, Rel **, Rel **, Rel **);
extern	void	update_sym(Cache *, Cache *, Addr, Half, Addr);

#ifdef	__cplusplus
}
#endif

#endif /* __LIBRTLD_H */