usr/src/head/syms.h

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (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 (c) 1988 AT&T	*/
/*	  All Rights Reserved	*/


#ifndef	_SYMS_H
#define	_SYMS_H

/*		Storage Classes are defined in storclass.h  */
#include <storclass.h>

#ifdef	__cplusplus
extern "C" {
#endif

/*		Number of characters in a symbol name */
#define	SYMNMLEN	8
/*		Number of characters in a file name */
#define	FILNMLEN	14
/*		Number of array dimensions in auxiliary entry */
#define	DIMNUM		4

struct syment
{
	union
	{
		char		_n_name[SYMNMLEN];	/* old COFF version */
		struct
		{
			long	_n_zeroes;	/* new == 0 */
			long	_n_offset;	/* offset into string table */
		} _n_n;
		char		*_n_nptr[2];	/* allows for overlaying */
	} _n;
	unsigned long		n_value;	/* value of symbol */
	short			n_scnum;	/* section number */
	unsigned short		n_type;		/* type and derived type */
	char			n_sclass;	/* storage class */
	char			n_numaux;	/* number of aux. entries */
};

#define	n_name		_n._n_name
#define	n_nptr		_n._n_nptr[1]
#define	n_zeroes	_n._n_n._n_zeroes
#define	n_offset	_n._n_n._n_offset

/*
 * Relocatable symbols have a section number of the
 * section in which they are defined.  Otherwise, section
 * numbers have the following meanings:
 */
	/* undefined symbol */
#define	N_UNDEF	0
	/* value of symbol is absolute */
#define	N_ABS	-1
	/* special debugging symbol -- value of symbol is meaningless */
#define	N_DEBUG	-2
	/* indicates symbol needs transfer vector (preload) */
#define	N_TV	(unsigned short)-3

	/* indicates symbol needs transfer vector (postload) */

#define	P_TV	(unsigned short)-4

/*
 * The fundamental type of a symbol packed into the low
 * 4 bits of the word.
 */

#define	_EF	".ef"

#define	T_NULL		0
#define	T_ARG		1	/* function argument (only used by compiler) */
#define	T_CHAR		2	/* character */
#define	T_SHORT		3	/* short integer */
#define	T_INT		4	/* integer */
#define	T_LONG		5	/* long integer */
#define	T_FLOAT		6	/* floating point */
#define	T_DOUBLE	7	/* double word */
#define	T_STRUCT	8	/* structure	*/
#define	T_UNION		9	/* union	*/
#define	T_ENUM		10	/* enumeration	*/
#define	T_MOE		11	/* member of enumeration */
#define	T_UCHAR		12	/* unsigned character */
#define	T_USHORT	13	/* unsigned short */
#define	T_UINT		14	/* unsigned integer */
#define	T_ULONG		15	/* unsigned long */

/*
 * derived types are:
 */

#define	DT_NON		0	/* no derived type */
#define	DT_PTR		1	/* pointer */
#define	DT_FCN		2	/* function */
#define	DT_ARY		3	/* array */

/*
 *   type packing constants
 */

#define	N_BTMASK	017
#define	N_TMASK		060
#define	N_TMASK1	0300
#define	N_TMASK2	0360
#define	N_BTSHFT	4
#define	N_TSHIFT	2

/*
 *   MACROS
 */

	/*   Basic Type of  x   */

#define	BTYPE(x)  ((x) & N_BTMASK)

	/*   Is  x  a  pointer ?   */

#define	ISPTR(x)  (((x) & N_TMASK) == (DT_PTR << N_BTSHFT))

	/*   Is  x  a  function ?  */

#define	ISFCN(x)  (((x) & N_TMASK) == (DT_FCN << N_BTSHFT))

	/*   Is  x  an  array ?   */

#define	ISARY(x)  (((x) & N_TMASK) == (DT_ARY << N_BTSHFT))

	/* Is x a structure, union, or enumeration TAG? */

#define	ISTAG(x)  ((x) == C_STRTAG || (x) == C_UNTAG || (x) == C_ENTAG)

#define	INCREF(x) ((((x)&~N_BTMASK)<<N_TSHIFT)|(DT_PTR<<N_BTSHFT)|(x&N_BTMASK))

#define	DECREF(x) ((((x)>>N_TSHIFT)&~N_BTMASK)|((x)&N_BTMASK))

/*
 *	AUXILIARY ENTRY FORMAT
 */

union auxent
{
	struct
	{
		long		x_tagndx;	/* str, un, or enum tag indx */
		union
		{
			struct
			{
				unsigned short	x_lnno;	/* declaration line */
							/* number */
				unsigned short	x_size;	/* str, union, array */
							/* size */
			} x_lnsz;
			long	x_fsize;	/* size of function */
		} x_misc;
		union
		{
			struct			/* if ISFCN, tag, or .bb */
			{
				long	x_lnnoptr;	/* ptr to fcn line # */
				long	x_endndx;	/* entry ndx past */
							/* block end */
			}	x_fcn;
			struct			/* if ISARY, up to 4 dimen. */
			{
				unsigned short	x_dimen[DIMNUM];
			}	x_ary;
		}		x_fcnary;
		unsigned short  x_tvndx;		/* tv index */
	}	x_sym;
	struct
	{
		char	x_fname[FILNMLEN];
	}	x_file;
	struct
	{
		long		x_scnlen;	/* section length */
		unsigned short	x_nreloc;	/* number of reloc entries */
		unsigned short	x_nlinno;	/* number of line numbers */
	}	x_scn;

	struct
	{
		long		x_tvfill;	/* tv fill value */
		unsigned short	x_tvlen;	/* length of .tv */
		unsigned short	x_tvran[2];	/* tv range */
	}	x_tv;	/* info about .tv section (in auxent of symbol .tv)) */
};

#define	SYMENT	struct syment
#define	SYMESZ	18	/* sizeof(SYMENT) */

#define	AUXENT	union auxent
#define	AUXESZ	18	/* sizeof(AUXENT) */

/*	Defines for "special" symbols   */

#define	_ETEXT	"etext"
#define	_EDATA	"edata"
#define	_END	"end"
#define	_START	"_start"

#ifdef	__cplusplus
}
#endif

#endif	/* _SYMS_H */