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/* This file is derived from the GAS 2.1.4 assembler control file.
   The GAS product is under the GNU Public License, version 2 or later.
   As such, this file is also under that license.
 
   If the file format changes in the COFF object, this file should be
   subsequently updated to reflect the changes.
 
   The actual loader module only uses a few of these structures. The full
   set is documented here because I received the full set. If you wish
   more information about COFF, then O'Reilly has a very excellent book.
*/
 
 
#define  E_SYMNMLEN  8   /* Number of characters in a symbol name         */
#define  E_FILNMLEN 14   /* Number of characters in a file name           */
#define  E_DIMNUM    4   /* Number of array dimensions in auxiliary entry */
 
/*
 * These defines are byte order independent. There is no alignment of fields
 * permitted in the structures. Therefore they are declared as characters
 * and the values loaded from the character positions. It also makes it
 * nice to have it "endian" independent.
 */
#if !defined(WORDS_BIGENDIAN)
/* Load a short int from the following tables with little-endian formats */
#define COFF_SHORT_L SWAP_ENDIAN_SHORT
/* Load a long int from the following tables with little-endian formats */
#define COFF_LONG_L SWAP_ENDIAN_LONG
/* Load a short int from the following tables with big-endian formats */
#define COFF_SHORT_H KEEP_ENDIAN_SHORT
/* Load a long int from the following tables with big-endian formats */
#define COFF_LONG_H KEEP_ENDIAN_LONG
#else
#define COFF_SHORT_L KEEP_ENDIAN_SHORT
#define COFF_LONG_L KEEP_ENDIAN_LONG
#define COFF_SHORT_H SWAP_ENDIAN_SHORT
#define COFF_LONG_H SWAP_ENDIAN_LONG
#endif
 
#define SWAP_ENDIAN_SHORT(ps) ((short)(((unsigned short)((unsigned char)ps[1])<<8)|\
				  ((unsigned short)((unsigned char)ps[0]))))
 
#define SWAP_ENDIAN_LONG(ps) (((long)(((unsigned long)((unsigned char)ps[3])<<24) |\
				 ((unsigned long)((unsigned char)ps[2])<<16) |\
				 ((unsigned long)((unsigned char)ps[1])<<8)  |\
				 ((unsigned long)((unsigned char)ps[0])))))
 
#define KEEP_ENDIAN_SHORT(ps) ((short)(((unsigned short)((unsigned char)ps[0])<<8)|\
				  ((unsigned short)((unsigned char)ps[1]))))
 
#define KEEP_ENDIAN_LONG(ps) (((long)(((unsigned long)((unsigned char)ps[0])<<24) |\
				 ((unsigned long)((unsigned char)ps[1])<<16) |\
				 ((unsigned long)((unsigned char)ps[2])<<8)  |\
				 ((unsigned long)((unsigned char)ps[3])))))
 
/* These may be overridden later by brain dead implementations which generate
   a big-endian header with little-endian data. In that case, generate a
   replacement macro which tests a flag and uses either of the two above
   as appropriate. */
 
#define COFF_LONG(v)   COFF_LONG_L(v)
#define COFF_SHORT(v)  COFF_SHORT_L(v)
 
/*** coff information for Intel 386/486.  */
 
 
/*
 *   Bits for f_flags:
 *
 *	F_RELFLG	relocation info stripped from file
 *	F_EXEC		file is executable  (i.e. no unresolved external
 *			references)
 *	F_LNNO		line numbers stripped from file
 *	F_LSYMS		local symbols stripped from file
 *	F_MINMAL	this is a minimal object file (".m") output of fextract
 *	F_UPDATE	this is a fully bound update file, output of ogen
 *	F_SWABD		this file has had its bytes swabbed (in names)
 *	F_AR16WR	this file has the byte ordering of an AR16WR
 *			(e.g. 11/70) machine
 *	F_AR32WR	this file has the byte ordering of an AR32WR machine
 *			(e.g. vax and iNTEL 386)
 *	F_AR32W		this file has the byte ordering of an AR32W machine
 *			(e.g. 3b,maxi)
 *	F_PATCH		file contains "patch" list in optional header
 *	F_NODF		(minimal file only) no decision functions for
 *			replaced functions
 */
 
#define  COFF_F_RELFLG		0000001
#define  COFF_F_EXEC		0000002
#define  COFF_F_LNNO		0000004
#define  COFF_F_LSYMS		0000010
#define  COFF_F_MINMAL		0000020
#define  COFF_F_UPDATE		0000040
#define  COFF_F_SWABD		0000100
#define  COFF_F_AR16WR		0000200
#define  COFF_F_AR32WR		0000400
#define  COFF_F_AR32W		0001000
#define  COFF_F_PATCH		0002000
#define  COFF_F_NODF		0002000
 
#define	COFF_I386MAGIC	        0x14c   /* Linux's system    */
 
#if 0   /* Perhaps, someday, these formats may be used.      */
#define COFF_I386PTXMAGIC	0x154
#define COFF_I386AIXMAGIC	0x175   /* IBM's AIX system  */
#define COFF_I386BADMAG(x) ((COFF_SHORT((x).f_magic) != COFF_I386MAGIC) \
			  && COFF_SHORT((x).f_magic) != COFF_I386PTXMAGIC \
			  && COFF_SHORT((x).f_magic) != COFF_I386AIXMAGIC)
#else
#define COFF_I386BADMAG(x) (COFF_SHORT((x).f_magic) != COFF_I386MAGIC)
#endif
 
/********************** FILE HEADER **********************/
 
struct coff_filehdr
{
  char f_magic[2];	// magic number			
  char f_nscns[2];	// number of sections		
  char f_timdat[4];	// time & date stamp		
  char f_symptr[4];	// file pointer to symtab	
  char f_nsyms[4];	// number of symtab entries	
  char f_opthdr[2];	// sizeof(optional hdr)		
  char f_flags[2];	// flags			
};
 
#define	COFF_FILHDR	struct coff_filehdr
#define	COFF_FILHSZ	sizeof(COFF_FILHDR)
 
/********************** AOUT "OPTIONAL HEADER" **********************/
 
/* Linux COFF must have this "optional" header. Standard COFF has no entry
   location for the "entry" point. They normally would start with the first
   location of the .text section. This is not a good idea for linux. So,
   the use of this "optional" header is not optional. It is required.
 
   Do not be tempted to assume that the size of the optional header is
   a constant and simply index the next byte by the size of this structure.
   Use the 'f_opthdr' field in the main coff header for the size of the
   structure actually written to the file!!
*/
 
//typedef struct 
struct COFF_aouthdr
{
  char 	magic[2];		/* type of file				 */
  char	vstamp[2];		/* version stamp			 */
  char	tsize[4];		/* text size in bytes, padded to FW bdry */
  char	dsize[4];		/* initialized   data "   "		 */
  char	bsize[4];		/* uninitialized data "   "		 */
  char	entry[4];		/* entry pt.				 */
  char 	text_start[4];		/* base of text used for this file       */
  char 	data_start[4];		/* base of data used for this file       */
};
 
#define COFF_AOUTHDR COFF_aouthdr
#define COFF_AOUTSZ (sizeof(COFF_AOUTHDR))
 
#define COFF_STMAGIC	0401
#define COFF_OMAGIC     0404
#define COFF_JMAGIC     0407    /* dirty text and data image, can't share  */
#define COFF_DMAGIC     0410    /* dirty text segment, data aligned        */
#define COFF_ZMAGIC     0413    /* The proper magic number for executables  */
#define COFF_SHMAGIC	0443	/* shared library header                   */
 
/********************** STORAGE CLASSES **********************/
 
/* This used to be defined as -1, but now n_sclass is unsigned.  */
#define C_EFCN		0xff	/* 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 */
 
#define C_WEAKEXT	127	/* weak symbol -- GNU extension */
 
/* New storage classes for TI COFF */
#define C_UEXT		19	/* Tentative external definition */
#define C_STATLAB	20	/* Static load time label */
#define C_EXTLAB	21	/* External load time label */
#define C_SYSTEM	23	/* System Wide variable */
 
/* New storage classes for WINDOWS_NT   */
#define C_SECTION       104     /* section name */
#define C_NT_WEAK	105	/* weak external */
 
 /* 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		*/
 
  /* Storage classes for m88k */
#define C_SHADOW        107     /* shadow symbol                */
#define C_VERSION       108     /* coff version symbol          */
 
 /* 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          (0x80)
#define C_LSYM          (0x81)
#define C_PSYM          (0x82)
#define C_RSYM          (0x83)
#define C_RPSYM         (0x84)
#define C_STSYM         (0x85)
#define C_TCSYM         (0x86)
#define C_BCOMM         (0x87)
#define C_ECOML         (0x88)
#define C_ECOMM         (0x89)
#define C_DECL          (0x8c)
#define C_ENTRY         (0x8d)
#define C_FUN           (0x8e)
#define C_BSTAT         (0x8f)
#define C_ESTAT         (0x90)
 
/* Storage classes for Thumb symbols */
#define C_THUMBEXT      (128 + C_EXT)		/* 130 */
#define C_THUMBSTAT     (128 + C_STAT)		/* 131 */
#define C_THUMBLABEL    (128 + C_LABEL)		/* 134 */
#define C_THUMBEXTFUNC  (C_THUMBEXT  + 20)	/* 150 */
#define C_THUMBSTATFUNC (C_THUMBSTAT + 20)	/* 151 */
 
/********************** SECTION HEADER **********************/
 
struct COFF_scnhdr {
  char		s_name[8];	/* section name			    */
  char		s_paddr[4];	/* physical address, aliased s_nlib */
  char		s_vaddr[4];	/* virtual address		    */
  char		s_size[4];	/* section size			    */
  char		s_scnptr[4];	/* file ptr to raw data for section */
  char		s_relptr[4];	/* file ptr to relocation	    */
  char		s_lnnoptr[4];	/* file ptr to line numbers	    */
  char		s_nreloc[2];	/* number of relocation entries	    */
  char		s_nlnno[2];	/* number of line number entries    */
  char		s_flags[4];	/* flags			    */
};
 
#define	COFF_SCNHDR	struct COFF_scnhdr
#define	COFF_SCNHSZ	sizeof(COFF_SCNHDR)
 
/*
 * names of "special" sections
 */
 
#define COFF_TEXT	".text"
#define COFF_DATA	".data"
#define COFF_BSS	".bss"
#define COFF_COMMENT    ".comment"
#define COFF_LIB        ".lib"
 
#define COFF_SECT_TEXT  0      /* Section for instruction code             */
#define COFF_SECT_DATA  1      /* Section for initialized globals          */
#define COFF_SECT_BSS   2      /* Section for un-initialized globals       */
#define COFF_SECT_REQD  3      /* Minimum number of sections for good file */
 
#define COFF_STYP_REG     0x00 /* regular segment                          */
#define COFF_STYP_DSECT   0x01 /* dummy segment                            */
#define COFF_STYP_NOLOAD  0x02 /* no-load segment                          */
#define COFF_STYP_GROUP   0x04 /* group segment                            */
#define COFF_STYP_PAD     0x08 /* .pad segment                             */
#define COFF_STYP_COPY    0x10 /* copy section                             */
#define COFF_STYP_TEXT    0x20 /* .text segment                            */
#define COFF_STYP_DATA    0x40 /* .data segment                            */
#define COFF_STYP_BSS     0x80 /* .bss segment                             */
#define COFF_STYP_INFO   0x200 /* .comment section                         */
#define COFF_STYP_OVER   0x400 /* overlay section                          */
#define COFF_STYP_LIB    0x800 /* library section                          */
 
/*
 * Shared libraries have the following section header in the data field for
 * each library.
 */
 
struct COFF_slib {
  char		sl_entsz[4];	/* Size of this entry               */
  char		sl_pathndx[4];	/* size of the header field         */
};
 
#define	COFF_SLIBHD	struct COFF_slib
#define	COFF_SLIBSZ	sizeof(COFF_SLIBHD)
 
/********************** 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 COFF_lineno {
  union {
    char l_symndx[4];	/* function name symbol index, iff l_lnno == 0*/
    char l_paddr[4];	/* (physical) address of line number	*/
  } l_addr;
  char l_lnno[2];	/* line number		*/
};
 
#define	COFF_LINENO	struct COFF_lineno
#define	COFF_LINESZ	6
 
/********************** SYMBOLS **********************/
 
#define COFF_E_SYMNMLEN	 8	/* # characters in a short symbol name	*/
#define COFF_E_FILNMLEN	14	/* # characters in a file name		*/
#define COFF_E_DIMNUM	 4	/* # array dimensions in auxiliary entry */
 
/*
 *  All symbols and sections have the following definition
 */
 
struct COFF_syment 
{
  union {
    char e_name[E_SYMNMLEN];    /* Symbol name (first 8 characters) */
    struct {
      char e_zeroes[4];         /* Leading zeros */
      char e_offset[4];         /* Offset if this is a header section */
    } e;
  } e;
 
  char e_value[4];              /* Value (address) of the segment */
  char e_scnum[2];              /* Section number */
  char e_type[2];               /* Type of section */
  char e_sclass[1];             /* Loader class */
  char e_numaux[1];             /* Number of auxiliary entries which follow */
};
 
#define COFF_N_BTMASK	(0xf)   /* Mask for important class bits */
#define COFF_N_TMASK	(0x30)  /* Mask for important type bits  */
#define COFF_N_BTSHFT	(4)     /* # bits to shift class field   */
#define COFF_N_TSHIFT	(2)     /* # bits to shift type field    */
 
/*
 *  Auxiliary entries because the main table is too limiting.
 */
 
union COFF_auxent {
 
/*
 *  Debugger information
 */
 
  struct {
    char x_tagndx[4];	        /* str, un, or enum tag indx */
    union {
      struct {
	char  x_lnno[2];        /* declaration line number */
	char  x_size[2];        /* str/union/array size */
      } x_lnsz;
      char x_fsize[4];	        /* size of function */
    } x_misc;
 
    union {
      struct {		        /* if ISFCN, tag, or .bb */
	char x_lnnoptr[4];	/* ptr to fcn line # */
	char x_endndx[4];	/* entry ndx past block end */
      } x_fcn;
 
      struct {		        /* if ISARY, up to 4 dimen. */
	char x_dimen[E_DIMNUM][2];
      } x_ary;
    } x_fcnary;
 
    char x_tvndx[2];	/* tv index */
  } x_sym;
 
/*
 *   Source file names (debugger information)
 */
 
  union {
    char x_fname[E_FILNMLEN];
    struct {
      char x_zeroes[4];
      char x_offset[4];
    } x_n;
  } x_file;
 
/*
 *   Section information
 */
 
  struct {
    char x_scnlen[4];	/* section length */
    char x_nreloc[2];	/* # relocation entries */
    char x_nlinno[2];	/* # line numbers */
  } x_scn;
 
/*
 *   Transfer vector (branch table)
 */
 
  struct {
    char x_tvfill[4];	/* tv fill value */
    char x_tvlen[2];	/* length of .tv */
    char x_tvran[2][2];	/* tv range */
  } x_tv;		/* info about .tv section (in auxent of symbol .tv)) */
};
 
#define	COFF_SYMENT	struct COFF_syment
#define	COFF_SYMESZ	18	
#define	COFF_AUXENT	union COFF_auxent
#define	COFF_AUXESZ	18
 
#define COFF_ETEXT	"etext"
 
/********************** RELOCATION DIRECTIVES **********************/
 
struct COFF_reloc {
  char r_vaddr[4];        /* Virtual address of item    */
  char r_symndx[4];       /* Symbol index in the symtab */
  char r_type[2];         /* Relocation type            */
};
 
#define COFF_RELOC struct COFF_reloc
#define COFF_RELSZ 10
 
#define COFF_DEF_DATA_SECTION_ALIGNMENT  4
#define COFF_DEF_BSS_SECTION_ALIGNMENT   4
#define COFF_DEF_TEXT_SECTION_ALIGNMENT  4
 
/* For new sections we haven't heard of before */
#define COFF_DEF_SECTION_ALIGNMENT       4