[linux-block.git] / include / linux / coff.h

/* This file is derived from the GAS 2.1.4 assembler control file.
   The GAS product is under the GNU General 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.
 */
 
/* Load a short int from the following tables with little-endian formats */
#define COFF_SHORT_L(ps) ((short)(((unsigned short)((unsigned char)ps[1])<<8)|\
				  ((unsigned short)((unsigned char)ps[0]))))

/* Load a long int from the following tables with little-endian formats */
#define COFF_LONG_L(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])))))
 
/* Load a short int from the following tables with big-endian formats */
#define COFF_SHORT_H(ps) ((short)(((unsigned short)((unsigned char)ps[0])<<8)|\
				  ((unsigned short)((unsigned char)ps[1]))))

/* Load a long int from the following tables with big-endian formats */
#define COFF_LONG_H(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.  */

/********************** 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			*/
};

/*
 *   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

#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 
{
  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       */
}
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                   */

/********************** 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
Commit	Line	Data
1da177e4 LT	1	/* This file is derived from the GAS 2.1.4 assembler control file.
	2	The GAS product is under the GNU General Public License, version 2 or later.
	3	As such, this file is also under that license.
	4
	5	If the file format changes in the COFF object, this file should be
	6	subsequently updated to reflect the changes.
	7
	8	The actual loader module only uses a few of these structures. The full
	9	set is documented here because I received the full set. If you wish
	10	more information about COFF, then O'Reilly has a very excellent book.
	11	*/
	12
	13	#define E_SYMNMLEN 8 /* Number of characters in a symbol name */
	14	#define E_FILNMLEN 14 /* Number of characters in a file name */
	15	#define E_DIMNUM 4 /* Number of array dimensions in auxiliary entry */
	16
	17	/*
	18	* These defines are byte order independent. There is no alignment of fields
	19	* permitted in the structures. Therefore they are declared as characters
	20	* and the values loaded from the character positions. It also makes it
	21	* nice to have it "endian" independent.
	22	*/
	23
	24	/* Load a short int from the following tables with little-endian formats */
	25	#define COFF_SHORT_L(ps) ((short)(((unsigned short)((unsigned char)ps[1])<<8)\|\
	26	((unsigned short)((unsigned char)ps[0]))))
	27
	28	/* Load a long int from the following tables with little-endian formats */
	29	#define COFF_LONG_L(ps) (((long)(((unsigned long)((unsigned char)ps[3])<<24) \|\
	30	((unsigned long)((unsigned char)ps[2])<<16) \|\
	31	((unsigned long)((unsigned char)ps[1])<<8) \|\
	32	((unsigned long)((unsigned char)ps[0])))))
	33
	34	/* Load a short int from the following tables with big-endian formats */
	35	#define COFF_SHORT_H(ps) ((short)(((unsigned short)((unsigned char)ps[0])<<8)\|\
	36	((unsigned short)((unsigned char)ps[1]))))
	37
	38	/* Load a long int from the following tables with big-endian formats */
	39	#define COFF_LONG_H(ps) (((long)(((unsigned long)((unsigned char)ps[0])<<24) \|\
	40	((unsigned long)((unsigned char)ps[1])<<16) \|\
	41	((unsigned long)((unsigned char)ps[2])<<8) \|\
	42	((unsigned long)((unsigned char)ps[3])))))
	43
	44	/* These may be overridden later by brain dead implementations which generate
	45	a big-endian header with little-endian data. In that case, generate a
	46	replacement macro which tests a flag and uses either of the two above
	47	as appropriate. */
	48
	49	#define COFF_LONG(v) COFF_LONG_L(v)
	50	#define COFF_SHORT(v) COFF_SHORT_L(v)
	51
	52	/*** coff information for Intel 386/486. */
	53
	54	/******************** FILE HEADER ********************/
	55
	56	struct COFF_filehdr {
	57	char f_magic[2]; /* magic number */
	58	char f_nscns[2]; /* number of sections */
	59	char f_timdat[4]; /* time & date stamp */
	60	char f_symptr[4]; /* file pointer to symtab */
	61	char f_nsyms[4]; /* number of symtab entries */
	62	char f_opthdr[2]; /* sizeof(optional hdr) */
	63	char f_flags[2]; /* flags */
	64	};
65
66	/*
67	* Bits for f_flags:
68	*
69	* F_RELFLG relocation info stripped from file
70	* F_EXEC file is executable (i.e. no unresolved external
71	* references)
72	* F_LNNO line numbers stripped from file
73	* F_LSYMS local symbols stripped from file
74	* F_MINMAL this is a minimal object file (".m") output of fextract
75	* F_UPDATE this is a fully bound update file, output of ogen
76	* F_SWABD this file has had its bytes swabbed (in names)
77	* F_AR16WR this file has the byte ordering of an AR16WR
78	* (e.g. 11/70) machine
79	* F_AR32WR this file has the byte ordering of an AR32WR machine
80	* (e.g. vax and iNTEL 386)
81	* F_AR32W this file has the byte ordering of an AR32W machine
82	* (e.g. 3b,maxi)
83	* F_PATCH file contains "patch" list in optional header
84	* F_NODF (minimal file only) no decision functions for
85	* replaced functions
86	*/
87
88	#define COFF_F_RELFLG 0000001
89	#define COFF_F_EXEC 0000002
90	#define COFF_F_LNNO 0000004
91	#define COFF_F_LSYMS 0000010
92	#define COFF_F_MINMAL 0000020
93	#define COFF_F_UPDATE 0000040
94	#define COFF_F_SWABD 0000100
95	#define COFF_F_AR16WR 0000200
96	#define COFF_F_AR32WR 0000400
97	#define COFF_F_AR32W 0001000
98	#define COFF_F_PATCH 0002000
99	#define COFF_F_NODF 0002000
100
101	#define COFF_I386MAGIC 0x14c /* Linux's system */
102
103	#if 0 /* Perhaps, someday, these formats may be used. */
104	#define COFF_I386PTXMAGIC 0x154
105	#define COFF_I386AIXMAGIC 0x175 /* IBM's AIX system */
106	#define COFF_I386BADMAG(x) ((COFF_SHORT((x).f_magic) != COFF_I386MAGIC) \
107	&& COFF_SHORT((x).f_magic) != COFF_I386PTXMAGIC \
108	&& COFF_SHORT((x).f_magic) != COFF_I386AIXMAGIC)
109	#else
110	#define COFF_I386BADMAG(x) (COFF_SHORT((x).f_magic) != COFF_I386MAGIC)
111	#endif
112
113	#define COFF_FILHDR struct COFF_filehdr
114	#define COFF_FILHSZ sizeof(COFF_FILHDR)
115
116	/******************** AOUT "OPTIONAL HEADER" ********************/
117
118	/* Linux COFF must have this "optional" header. Standard COFF has no entry
119	location for the "entry" point. They normally would start with the first
120	location of the .text section. This is not a good idea for linux. So,
121	the use of this "optional" header is not optional. It is required.
122
123	Do not be tempted to assume that the size of the optional header is
124	a constant and simply index the next byte by the size of this structure.
125	Use the 'f_opthdr' field in the main coff header for the size of the
126	structure actually written to the file!!
127	*/
128
129	typedef struct
130	{
131	char magic[2]; /* type of file */
132	char vstamp[2]; /* version stamp */
133	char tsize[4]; /* text size in bytes, padded to FW bdry */
134	char dsize[4]; /* initialized data " " */
135	char bsize[4]; /* uninitialized data " " */
136	char entry[4]; /* entry pt. */
137	char text_start[4]; /* base of text used for this file */
138	char data_start[4]; /* base of data used for this file */
139	}
140	COFF_AOUTHDR;
141
142	#define COFF_AOUTSZ (sizeof(COFF_AOUTHDR))
143
144	#define COFF_STMAGIC 0401
145	#define COFF_OMAGIC 0404
146	#define COFF_JMAGIC 0407 /* dirty text and data image, can't share */
147	#define COFF_DMAGIC 0410 /* dirty text segment, data aligned */
148	#define COFF_ZMAGIC 0413 /* The proper magic number for executables */
149	#define COFF_SHMAGIC 0443 /* shared library header */
150
151	/******************** SECTION HEADER ********************/
152
153	struct COFF_scnhdr {
154	char s_name[8]; /* section name */
155	char s_paddr[4]; /* physical address, aliased s_nlib */
156	char s_vaddr[4]; /* virtual address */
157	char s_size[4]; /* section size */
158	char s_scnptr[4]; /* file ptr to raw data for section */
159	char s_relptr[4]; /* file ptr to relocation */
160	char s_lnnoptr[4]; /* file ptr to line numbers */
161	char s_nreloc[2]; /* number of relocation entries */
162	char s_nlnno[2]; /* number of line number entries */
163	char s_flags[4]; /* flags */
164	};
165
166	#define COFF_SCNHDR struct COFF_scnhdr
167	#define COFF_SCNHSZ sizeof(COFF_SCNHDR)
168
169	/*
170	* names of "special" sections
171	*/
172
173	#define COFF_TEXT ".text"
174	#define COFF_DATA ".data"
175	#define COFF_BSS ".bss"
176	#define COFF_COMMENT ".comment"
177	#define COFF_LIB ".lib"
178
179	#define COFF_SECT_TEXT 0 /* Section for instruction code */
180	#define COFF_SECT_DATA 1 /* Section for initialized globals */
181	#define COFF_SECT_BSS 2 /* Section for un-initialized globals */
182	#define COFF_SECT_REQD 3 /* Minimum number of sections for good file */
183
184	#define COFF_STYP_REG 0x00 /* regular segment */
185	#define COFF_STYP_DSECT 0x01 /* dummy segment */
186	#define COFF_STYP_NOLOAD 0x02 /* no-load segment */
187	#define COFF_STYP_GROUP 0x04 /* group segment */
188	#define COFF_STYP_PAD 0x08 /* .pad segment */
189	#define COFF_STYP_COPY 0x10 /* copy section */
190	#define COFF_STYP_TEXT 0x20 /* .text segment */
191	#define COFF_STYP_DATA 0x40 /* .data segment */
192	#define COFF_STYP_BSS 0x80 /* .bss segment */
193	#define COFF_STYP_INFO 0x200 /* .comment section */
194	#define COFF_STYP_OVER 0x400 /* overlay section */
195	#define COFF_STYP_LIB 0x800 /* library section */
196
197	/*
198	* Shared libraries have the following section header in the data field for
199	* each library.
200	*/
201
202	struct COFF_slib {
203	char sl_entsz[4]; /* Size of this entry */
204	char sl_pathndx[4]; /* size of the header field */
205	};
206
207	#define COFF_SLIBHD struct COFF_slib
208	#define COFF_SLIBSZ sizeof(COFF_SLIBHD)
209
210	/******************** LINE NUMBERS ********************/
211
212	/* 1 line number entry for every "breakpointable" source line in a section.
213	* Line numbers are grouped on a per function basis; first entry in a function
214	* grouping will have l_lnno = 0 and in place of physical address will be the
215	* symbol table index of the function name.
216	*/
217
218	struct COFF_lineno {
219	union {
220	char l_symndx[4]; /* function name symbol index, iff l_lnno == 0*/
221	char l_paddr[4]; /* (physical) address of line number */
222	} l_addr;
223	char l_lnno[2]; /* line number */
224	};
225
226	#define COFF_LINENO struct COFF_lineno
227	#define COFF_LINESZ 6
228
229	/******************** SYMBOLS ********************/
230
231	#define COFF_E_SYMNMLEN 8 /* # characters in a short symbol name */
232	#define COFF_E_FILNMLEN 14 /* # characters in a file name */
233	#define COFF_E_DIMNUM 4 /* # array dimensions in auxiliary entry */
234
235	/*
236	* All symbols and sections have the following definition
237	*/
238
239	struct COFF_syment
240	{
241	union {
242	char e_name[E_SYMNMLEN]; /* Symbol name (first 8 characters) */
243	struct {
244	char e_zeroes[4]; /* Leading zeros */
245	char e_offset[4]; /* Offset if this is a header section */
246	} e;
247	} e;
248
249	char e_value[4]; /* Value (address) of the segment */
250	char e_scnum[2]; /* Section number */
251	char e_type[2]; /* Type of section */
252	char e_sclass[1]; /* Loader class */
253	char e_numaux[1]; /* Number of auxiliary entries which follow */
254	};
255
256	#define COFF_N_BTMASK (0xf) /* Mask for important class bits */
257	#define COFF_N_TMASK (0x30) /* Mask for important type bits */
258	#define COFF_N_BTSHFT (4) /* # bits to shift class field */
259	#define COFF_N_TSHIFT (2) /* # bits to shift type field */
260
261	/*
262	* Auxiliary entries because the main table is too limiting.
263	*/
264
265	union COFF_auxent {
266
267	/*
268	* Debugger information
269	*/
270
271	struct {
272	char x_tagndx[4]; /* str, un, or enum tag indx */
273	union {
274	struct {
275	char x_lnno[2]; /* declaration line number */
276	char x_size[2]; /* str/union/array size */
277	} x_lnsz;
278	char x_fsize[4]; /* size of function */
279	} x_misc;
280
281	union {
282	struct { /* if ISFCN, tag, or .bb */
283	char x_lnnoptr[4]; /* ptr to fcn line # */
284	char x_endndx[4]; /* entry ndx past block end */
285	} x_fcn;
286
287	struct { /* if ISARY, up to 4 dimen. */
288	char x_dimen[E_DIMNUM][2];
289	} x_ary;
290	} x_fcnary;
291
292	char x_tvndx[2]; /* tv index */
293	} x_sym;
294
295	/*
296	* Source file names (debugger information)
297	*/
298
299	union {
300	char x_fname[E_FILNMLEN];
301	struct {
302	char x_zeroes[4];
303	char x_offset[4];
304	} x_n;
305	} x_file;
306
307	/*
308	* Section information
309	*/
310
311	struct {
312	char x_scnlen[4]; /* section length */
313	char x_nreloc[2]; /* # relocation entries */
314	char x_nlinno[2]; /* # line numbers */
315	} x_scn;
316
317	/*
318	* Transfer vector (branch table)
319	*/
320
321	struct {
322	char x_tvfill[4]; /* tv fill value */
323	char x_tvlen[2]; /* length of .tv */
324	char x_tvran[2][2]; /* tv range */
325	} x_tv; /* info about .tv section (in auxent of symbol .tv)) */
326	};
327
328	#define COFF_SYMENT struct COFF_syment
329	#define COFF_SYMESZ 18
330	#define COFF_AUXENT union COFF_auxent
331	#define COFF_AUXESZ 18
332
333	#define COFF_ETEXT "etext"
334
335	/******************** RELOCATION DIRECTIVES ********************/
336
337	struct COFF_reloc {
338	char r_vaddr[4]; /* Virtual address of item */
339	char r_symndx[4]; /* Symbol index in the symtab */
340	char r_type[2]; /* Relocation type */
341	};
342
343	#define COFF_RELOC struct COFF_reloc
344	#define COFF_RELSZ 10
345
346	#define COFF_DEF_DATA_SECTION_ALIGNMENT 4
347	#define COFF_DEF_BSS_SECTION_ALIGNMENT 4
348	#define COFF_DEF_TEXT_SECTION_ALIGNMENT 4
349
350	/* For new sections we haven't heard of before */
351	#define COFF_DEF_SECTION_ALIGNMENT 4