/*
 *
 *	Layout of a.out file :
 *
 *	header			unsigned short machine stamp	~ set by machine
 *				unsigned short magic number 
 *				short configuration	~set by user
 *				short DSTD size		) in # entries
 *				long reserved hp spare
 *				long text size		)
 *				long data size		) in bytes
 *				long bss size		)
 *				long text relocation size)
 *				long data relocation size)
 *				long MIS size		)
 *				long LEST size 		)
 *				long DST size		)
 *				long entry point
 *				long spare field 1
 *				long spare field 2
 *				long spare field 3
 *				long spare field 4
 *
 *
 *
 *	header:			0
 *	text:			sizeof(header)
 *	data:			sizeof(header)+textsize
 *	MIS:			sizeof(header)+textsize+datasize
 *	LEST:			sizeof(header)+textsize+datasize+ 
 *				MISsize 
 *	DSTD			sizeof(header)+textsize+datasize+
 *				MISsize+LESTsize
 *	DST			sizeof(header)+textsize+datasize+
 *				MISsize+LESTsize+dstdir*sizeof(dstd_entry)
 *	text relocation:	sizeof(header)+textsize+datasize+
 *				MISsize+LESTsize+dstdir*sizeof(dstd_entry)+
 *				dstsize
 *	data relocation:	sizeof(header)+textsize+datasize+
 *				MISsize+LESTsize+dstdir*sizeof(dstd_entry)+
 *				dstsize+rtextsize
 *				rtextsize
 *
 */

/* header of a.out files */

#ifndef FLIP /* sph */
#include <magic.h>
#endif /* sph */

struct exec {	
		MAGIC	a_magic;
		short	a_stamp;
		short	a_dstdir;
		long	a_sparehp;
		long	a_text;
		long	a_data;
		long	a_bss;
		long	a_trsize;
		long	a_drsize;
		long	a_pasint;
		long	a_lesyms;
		long	a_dsyms;
		long	a_entry;
		long	a_spare1;
		long	a_spare2;
		long	a_spare3;
		long	a_spare4;
};

#ifndef KERNEL

/* macros which define various positions in file based on an exec: filhdr */
#define TEXTPOS		sizeof(filhdr)
#define DATAPOS 	TEXTPOS + filhdr.a_text
#define MODCALPOS	DATAPOS + filhdr.a_data
#define LESYMPOS	MODCALPOS + filhdr.a_pasint /* mit = SYMPOS */
#define DSTDPOS		LESYMPOS + filhdr.a_lesyms
#define DSTPOS		DSTDPOS + (filhdr.a_dstdir * sizeof(struct dstdentry))
#define RTEXTPOS	DSTPOS + filhdr.a_dsyms
#define RDATAPOS	RTEXTPOS + filhdr.a_trsize

/* symbol management */
struct nlist_ {			/* mit = sym */	/* sizeof(struct nlist)=10 */
	long	n_value;	/* mit = svalue */
	unsigned char	n_type;		/* mit = stype */
	unsigned char	n_length;	/* length of ascii symbol name */
	short	n_unit;		/* symbolic debugging unit number */
	short	n_sdindex;	/* index into DST */
};

struct dstdentry {
	long	d_tstart;	/* relative pos of text unit to TEXTPOS */
	long	d_dstart;	/* relative pos of data unit to DATAPOS */
	long	d_bstart;	/* relative start of bss unit */
	long	d_mstart;	/* relative start of MIS unit */
	long	d_lesstart;	/* relative start of LEST unit */
	long	d_dststart;	/* relative start of DST unit */
	long	d_dstspare;	/* */
	};

/* NOTE: entries in dstdentry are relative offsets from the actual beginning
   of the major exec segment. (e.g. the first dstdentry in dstdir will always
   have 0 in all fields) */
/* NOTE: at this time there is no d_cstart for relative start of common units
   because I don't see how we can segment common by unit. Common space is
   allocated between the data segment and the bss area by the loader based 
   on the symbol table that is entirely rebuilt during the link editing 
   process (no duplicate entries in common). */

/* relocation commands */
struct r_info {		/* mit= reloc{rpos,rsymbol,rsegment,rsize,rdisp} */
	long r_address;		/* position of relocation in segment */
	short r_symbolnum;	/* id of the symbol of external relocations */
	char r_segment;		/* RTEXT, RDATA, RBSS, or REXTERN */
	char r_length;		/* RBYTE, RWORD, or RLONG */
};

/* symbol types */
#define	EXTERN	040	/* = 0x20 */
#define ALIGN	020	/* = 0x10 */	/* special alignment symbol type */
#define	UNDEF	00
#define	ABS	01
#define	TEXT	02
#define	DATA	03
#define	BSS	04
#define	COMM	05	/* internal use only */
#define REG	06

/* relocation regions */
#define	RTEXT	00
#define	RDATA	01
#define	RBSS	02
#define	REXT	03

/* relocation sizes */
#define RBYTE	00
#define RWORD	01
#define RLONG	02
#define RALIGN	03	/* special reloc flag to support .align symbols */

		/* values for type flag */
#define	N_UNDF	0	/* undefined */
#define	N_ABS	01	/* absolute */
#define	N_TEXT	02	/* text symbol */
#define	N_DATA	03	/* data symbol */
#define	N_BSS	04	/* bss symbol */
#define	N_TYPE	037
#define	N_REG	024	/* register name */
#define	N_FN	037	/* file name symbol */
#define	N_EXT	040	/* external bit, or'ed in */



#define SYMLENGTH	255		/* maximum length of a symbol */

/* These suffixes must also be maintained in the cc shell file */

#define OUT_NAME "a.out"
#define OBJ_SUFFIX ".o"
#define C_SUFFIX ".c"
#define ASM_SUFFIX ".s"

#define N_BADTYPE(x) (((x).a_magic.file_type)!=EXEC_MAGIC&&\
	((x).a_magic.file_type)!=SHARE_MAGIC)

#define N_BADMACH(x) ((x).a_magic.system_id!=HP98x6_ID)
#define N_BADMAG(x)  (N_BADTYPE(x) || N_BADMACH(x))

#endif