coff.h

arm-linux-gcc编译器

#define STYP_PAD	0x08	/* Padded section (not allocated, */
				/* not relocated, loaded) */
#define	STYP_COPY	0x10	/* Copy section (for a decision */
				/* function used in updating fields; */
				/* not allocated, not relocated, */
				/* loaded, relocation and line */
				/* number entries processed */
				/* normally) */
#define	STYP_TEXT	0x20	/* Section contains executable text */
#define	STYP_DATA	0x40	/* Section contains initialized data */
#define	STYP_BSS	0x80	/* Section contains only uninitialized data */
#define STYP_INFO	0x200	/* Comment section (not allocated, */
				/* not relocated, not loaded) */
#define STYP_OVER	0x400	/* Overlay section (relocated, */
				/* not allocated, not loaded) */
#define STYP_LIB	0x800	/* For .lib section (like STYP_INFO) */

#define	STYP_BSSREG	0x1200	/* Global register area (like STYP_INFO) */
#define STYP_ENVIR	0x2200	/* Environment (like STYP_INFO) */
#define STYP_ABS	0x4000	/* Absolute (allocated, not reloc, loaded) */
#define STYP_LIT	0x8020	/* Literal data (like STYP_TEXT) */

/*
NOTE:  The use of STYP_BSSREG for relocation is not yet defined.
*/

/*--------------------------------------------------------------*/

/*
** Relocation information declaration and related definitions
*/

struct reloc 
{
	long		r_vaddr;	/* (virtual) address of reference */
	long		r_symndx;	/* index into symbol table */
	unsigned short	r_type;		/* relocation type */
};

#define	RELOC		struct reloc
#define	RELSZ		10		/* sizeof (RELOC) */ 

/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -*/

/*
** Relocation types for the Am29000 
*/

#define	R_ABS		0	/* reference is absolute */
 
#define	R_IREL		030	/* instruction relative (jmp/call) */
#define	R_IABS		031	/* instruction absolute (jmp/call) */
#define	R_ILOHALF	032	/* instruction low half  (const)  */
#define	R_IHIHALF	033	/* instruction high half (consth) part 1 */
#define	R_IHCONST	034	/* instruction high half (consth) part 2 */
				/* constant offset of R_IHIHALF relocation */
#define	R_BYTE		035	/* relocatable byte value */
#define R_HWORD		036	/* relocatable halfword value */
#define R_WORD		037	/* relocatable word value */

#define	R_IGLBLRC	040	/* instruction global register RC */
#define	R_IGLBLRA	041	/* instruction global register RA */
#define	R_IGLBLRB	042	/* instruction global register RB */
 
/*
NOTE:
All the "I" forms refer to Am29000 instruction formats.  The linker is 
expected to know how the numeric information is split and/or aligned
within the instruction word(s).  R_BYTE works for instructions, too.

If the parameter to a CONSTH instruction is a relocatable type, two 
relocation records are written.  The first has an r_type of R_IHIHALF 
(33 octal) and a normal r_vaddr and r_symndx.  The second relocation 
record has an r_type of R_IHCONST (34 octal), a normal r_vaddr (which 
is redundant), and an r_symndx containing the 32-bit constant offset 
to the relocation instead of the actual symbol table index.  This 
second record is always written, even if the constant offset is zero.
The constant fields of the instruction are set to zero.
*/

/*--------------------------------------------------------------*/

/*
** Line number entry declaration and related definitions
*/

struct lineno 
{
   union 
   {
      long	l_symndx;	/* sym table index of function name */
      long	l_paddr;	/* (physical) address of line number */
   } l_addr;
   unsigned short	l_lnno;		/* line number */
};

#define	LINENO		struct lineno
#define	LINESZ		6		/* sizeof (LINENO) */

/*--------------------------------------------------------------*/

/*
** Symbol entry declaration and related definitions
*/

#define	SYMNMLEN	8	/* Number of characters in a symbol name */

struct	syment 
{
   union  
   {
      char	_n_name [SYMNMLEN];	/* symbol name */
      struct 
      {
         long	_n_zeroes;		/* symbol name */
         long	_n_offset;		/* offset into string table */
      } _n_n;
      char	*_n_nptr[2];		/* allows for overlaying */
   } _n;
#ifndef pdp11
   unsigned
#endif
   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

#define	SYMENT	struct syment
#define	SYMESZ	18

/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -*/

/*
** Storage class definitions - new classes for global registers.
*/

#define	C_EFCN		-1		/* physical end of a function */
#define	C_NULL		0		/* - */
#define	C_AUTO		1		/* automatic variable */
#define	C_EXT		2		/* external symbol */
#define C_STAT		3		/* static */
#define C_REG		4		/* (local) register variable */
#define C_EXTDEF	5		/* external definition */
#define C_LABEL		6		/* label */
#define C_ULABEL	7		/* undefined label */
#define C_MOS		8		/* member of structure */
#define C_ARG		9		/* function argument */
#define C_STRTAG	10		/* structure tag */
#define C_MOU		11		/* member of union */
#define C_UNTAG		12		/* union tag */
#define C_TPDEF		13		/* type definition */
#define C_UNSTATIC	14		/* uninitialized static  */
#define C_USTATIC	14		/* uninitialized static  */
#define C_ENTAG		15		/* enumeration tag */
#define C_MOE		16		/* member of enumeration */
#define C_REGPARM	17		/* register parameter */
#define C_FIELD		18		/* bit field */

#define C_GLBLREG	19		/* global register */
#define C_EXTREG	20		/* external global register */
#define	C_DEFREG	21		/* ext. def. of global register */
#define C_STARTOF	22		/* as29 $SIZEOF and $STARTOF symbols */


#define C_BLOCK		100		/* beginning and end of block */
#define C_FCN		101		/* beginning and end of function */
#define C_EOS		102		/* end of structure */
#define C_FILE		103		/* file name */
#define C_LINE		104		/* used only by utility programs */
#define C_ALIAS		105		/* duplicated tag */
#define C_HIDDEN	106		/* like static, used to avoid name */
					/* conflicts */
#define C_SHADOW	107		/* shadow symbol */

/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -*/

/*
** Special section number definitions used in symbol entries.
** (Section numbers 1-65535 are used to indicate the section
** where the symbol was defined.)
*/

#define	N_DEBUG		-2		/* special symbolic debugging symbol */
#define	N_ABS		-1		/* absolute symbol */
#define	N_UNDEF		 0		/* undefined external symbol */
#define N_SCNUM	   1-65535		/* section num where symbol defined */
	 			 
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -*/

/*
** Fundamental symbol types.
*/

#define	T_NULL		0		/* type not assigned */
#define T_VOID		1		/* void */
#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 symbol types.
*/

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

/*--------------------------------------------------------------*/

/*
** Auxiliary symbol table entry declaration and related 
** definitions.
*/

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

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_size;				/* size of functions */
      } 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 relocation 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_tvrna[2];			/* tv range */
   } x_tv;	 /* info about  tv section (in auxent of symbol  tv)) */
};

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