internal.h

早期freebsd实现

/* Internal format of COFF object file data structures, for GNU BFD.
   This file is part of BFD, the Binary File Descriptor library.  */

/* First, make "signed char" work, even on old compilers. */
#ifndef signed
#ifndef __STDC__
#define	signed	/**/
#endif
#endif

/********************** FILE HEADER **********************/
struct internal_filehdr 
{
  unsigned short	f_magic; /* magic number			*/
  unsigned short	f_nscns; /* number of sections		*/
  long		f_timdat;	/* time & date stamp		*/
  long		f_symptr;	/* file pointer to symtab	*/
  long		f_nsyms;	/* number of symtab entries	*/
  unsigned short	f_opthdr; /* sizeof(optional hdr)		*/
  unsigned short	f_flags; /* flags			*/
};

/* Bits for f_flags:
 *	F_RELFLG	relocation info stripped from file
 *	F_EXEC		file is executable (no unresolved external references)
 *	F_LNNO		line numbers stripped from file
 *	F_LSYMS		local symbols stripped from file
 *	F_AR16WR	file is 16-bit little-endian
 *	F_AR32WR	file is 32-bit little-endian
 *	F_AR32W		file is 32-bit big-endian
 *	F_DYNLOAD	rs/6000 aix: dynamically loadable w/imports & exports
 *	F_SHROBJ	rs/6000 aix: file is a shared object
 */

#define	F_RELFLG	(0x0001)
#define	F_EXEC		(0x0002)
#define	F_LNNO		(0x0004)
#define	F_LSYMS		(0x0008)
#define	F_AR16WR	(0x0080)
#define	F_AR32WR	(0x0100)
#define	F_AR32W     	(0x0200)
#define	F_DYNLOAD	(0x1000)
#define	F_SHROBJ	(0x2000)

/********************** AOUT "OPTIONAL HEADER" **********************/
struct internal_aouthdr {
	short		magic;	/* type of file				*/
	short		vstamp;	/* version stamp			*/
	unsigned long	tsize;	/* text size in bytes, padded to FW bdry*/
	unsigned long	dsize;	/* initialized data "  "		*/
	unsigned long	bsize;	/* uninitialized data "   "		*/
	unsigned long	entry;	/* entry pt.				*/
	unsigned long	text_start;	/* base of text used for this file */
	unsigned long	data_start;	/* base of data used for this file */

	/* i960 stuff */
	unsigned long	tagentries;	/* number of tag entries to follow */

	/* RS/6000 stuff */
        unsigned long   o_toc;	/* address of TOC			*/
        short		o_snentry;	/* section number for entry point */
        short		o_sntext;	/* section number for text	*/
        short		o_sndata;	/* section number for data	*/
        short		o_sntoc;	/* section number for toc	*/
        short		o_snloader;	/* section number for loader section */
        short		o_snbss;	/* section number for bss	*/
        short		o_algntext;	/* max alignment for text	*/
        short		o_algndata;	/* max alignment for data	*/
        short		o_modtype;	/* Module type field, 1R,RE,RO	*/
        unsigned long   o_maxstack;     /* max stack size allowed.	*/
};

/********************** STORAGE CLASSES **********************/

#define C_EFCN		-1	/* physical end of 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	/* 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_USTATIC	14	/* undefined 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_AUTOARG	19	/* auto argument		*/
#define C_LASTENT	20	/* dummy entry (end of block)	*/
#define C_BLOCK		100	/* ".bb" or ".eb"		*/
#define C_FCN		101	/* ".bf" or ".ef"		*/
#define C_EOS		102	/* end of structure		*/
#define C_FILE		103	/* file name			*/
#define C_LINE		104	/* line # reformatted as symbol table entry */
#define C_ALIAS	 	105	/* duplicate tag		*/
#define C_HIDDEN	106	/* ext symbol in dmert public lib */

	/* New storage classes for 80960 */
 
/* C_LEAFPROC is obsolete.  Use C_LEAFEXT or C_LEAFSTAT */
#define C_LEAFPROC	108	/* Leaf procedure, "call" via BAL */

#define C_SCALL		107	/* Procedure reachable via system call */
#define C_LEAFEXT       108	/* External leaf */
#define C_LEAFSTAT      113     /* Static leaf */
#define C_OPTVAR	109	/* Optimized variable		*/
#define C_DEFINE	110	/* Preprocessor #define		*/
#define C_PRAGMA	111	/* Advice to compiler or linker	*/
#define C_SEGMENT	112	/* 80960 segment name		*/

	/* New storage classes for RS/6000 */
#define C_HIDEXT        107     /* Un-named external symbol */
#define C_BINCL         108     /* Marks beginning of include file */
#define C_EINCL         109     /* Marks ending of include file */

	/* storage classes for stab symbols for RS/6000 */
#define C_GSYM          ((signed char)0x80)
#define C_LSYM          ((signed char)0x81)
#define C_PSYM          ((signed char)0x82)
#define C_RSYM          ((signed char)0x83)
#define C_RPSYM         ((signed char)0x84)
#define C_STSYM         ((signed char)0x85)
#define C_TCSYM         ((signed char)0x86)
#define C_BCOMM         ((signed char)0x87)
#define C_ECOML         ((signed char)0x88)
#define C_ECOMM         ((signed char)0x89)
#define C_DECL          ((signed char)0x8c)
#define C_ENTRY         ((signed char)0x8d)
#define C_FUN           ((signed char)0x8e)
#define C_BSTAT         ((signed char)0x8f)
#define C_ESTAT         ((signed char)0x90)

/********************** SECTION HEADER **********************/
struct internal_scnhdr {
	char		s_name[8];	/* section name			*/
	long		s_paddr;	/* physical address, aliased s_nlib */
	long		s_vaddr;	/* virtual address		*/
	long		s_size;		/* section size			*/
	long		s_scnptr;	/* file ptr to raw data for section */
	long		s_relptr;	/* file ptr to relocation	*/
	long		s_lnnoptr;	/* file ptr to line numbers	*/
	unsigned long 	s_nreloc;	/* number of relocation entries	*/
	unsigned long   s_nlnno;	/* number of line number entries*/
	long		s_flags;	/* flags			*/
#ifdef I960
	long		s_align;	
#endif
};


/*
 * s_flags "type"
 */
#define STYP_REG	 (0x0000) /* "regular": allocated, relocated, loaded */
#define STYP_DSECT	 (0x0001) /* "dummy":  relocated only*/
#define STYP_NOLOAD	 (0x0002) /* "noload": allocated, relocated, not loaded */
#define STYP_GROUP	 (0x0004) /* "grouped": formed of input sections */
#define STYP_PAD	 (0x0008) /* "padding": not allocated, not relocated, loaded */
#define STYP_COPY	 (0x0010) /* "copy": for decision function used by field update;  not allocated, not relocated,
				     loaded; reloc & lineno entries processed normally */
#define STYP_TEXT	 (0x0020) /* section contains text only */
#define S_SHRSEG	 (0x0020) /* In 3b Update files (output of ogen), sections which appear in SHARED segments of the Pfile
				     will have the S_SHRSEG flag set by ogen, to inform dufr that updating 1 copy of the proc. will
				     update all process invocations. */
#define STYP_DATA	 (0x0040) /* section contains data only */
#define STYP_BSS	 (0x0080) /* section contains bss only */
#define S_NEWFCN	 (0x0100) /* In a minimal file or an update file, a new function (as compared with a replaced function) */
#define STYP_INFO	 (0x0200) /* comment: not allocated not relocated, not loaded */
#define STYP_OVER	 (0x0400) /* overlay: relocated not allocated or loaded */
#define STYP_LIB	 (0x0800) /* for .lib: same as INFO */
#define STYP_MERGE	 (0x2000) /* merge section -- combines with text, data or bss sections only */
#define STYP_REVERSE_PAD (0x4000) /* section will be padded with no-op instructions wherever padding is necessary and there is a

				     word of contiguous bytes
				     beginning on a word boundary. */

#define STYP_LIT	0x8020	/* Literal data (like STYP_TEXT) */
/********************** LINE NUMBERS **********************/

/* 1 line number entry for every "breakpointable" source line in a section.
 * Line numbers are grouped on a per function basis; first entry in a function
 * grouping will have l_lnno = 0 and in place of physical address will be the
 * symbol table index of the function name.
 */

struct internal_lineno {
	union {
		long l_symndx;	/* function name symbol index, iff l_lnno == 0*/
		long l_paddr;	/* (physical) address of line number	*/
	} l_addr;
	unsigned long	l_lnno;	/* line number		*/
};


/********************** SYMBOLS **********************/

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

struct internal_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;
	long		n_value;	/* value of symbol		*/
	short		n_scnum;	/* section number		*/
	unsigned short	n_flags;	/* copy of flags from filhdr	*/
	unsigned short	n_type;		/* type and derived type	*/
	signed char	n_sclass;	/* storage class		*/
	char		n_numaux;	/* number of aux. entries	*/
};
#define n_name		_n._n_name
#define n_zeroes	_n._n_n._n_zeroes
#define n_offset	_n._n_n._n_offset


/* Relocatable symbols have number of the section in which they are defined,
   or one of the following: */

#define N_UNDEF	((short)0)  /* undefined symbol */
#define N_ABS	((short)-1) /* value of symbol is absolute */
#define N_DEBUG	((short)-2) /* debugging symbol -- value is meaningless */
#define N_TV	((short)-3) /* indicates symbol needs preload transfer vector */
#define P_TV	((short)-4) /* indicates symbol needs postload transfer vector*/