[binutils.git] / gas / a.out.gnu.h

/* This file is a.out.gnu.h

   Copyright (C) 1987-1992 Free Software Foundation, Inc.
   
   This file is part of GAS, the GNU Assembler.
   
   GAS is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2, or (at your option)
   any later version.
   
   GAS is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with GAS; see the file COPYING.  If not, write to
   the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */

#ifndef __A_OUT_GNU_H__
#define __A_OUT_GNU_H__

#include "aout/reloc.h"

#define __GNU_EXEC_MACROS__

#ifndef __STRUCT_EXEC_OVERRIDE__

/* This is the layout on disk of a Unix V7, Berkeley, SunOS, Vax Ultrix
   "struct exec".  Don't assume that on this machine, the "struct exec"
   will lay out the same sizes or alignments.  */

struct exec_bytes {
	unsigned char a_info[4];
	unsigned char a_text[4];
	unsigned char a_data[4];
	unsigned char a_bss[4];
	unsigned char a_syms[4];
	unsigned char a_entry[4];
	unsigned char a_trsize[4];
	unsigned char a_drsize[4];
};

/* How big the "struct exec" is on disk */
#define	EXEC_BYTES_SIZE	(8 * 4)

/* This is the layout in memory of a "struct exec" while we process it.  */

struct exec
{
	unsigned long a_info;		/* Use macros N_MAGIC, etc for access */
	unsigned a_text;		/* length of text, in bytes */
	unsigned a_data;		/* length of data, in bytes */
	unsigned a_bss;		/* length of uninitialized data area for file, in bytes */
	unsigned a_syms;		/* length of symbol table data in file, in bytes */
	unsigned a_entry;		/* start address */
	unsigned a_trsize;		/* length of relocation info for text, in bytes */
	unsigned a_drsize;		/* length of relocation info for data, in bytes */
};

#endif /* __STRUCT_EXEC_OVERRIDE__ */

/* these go in the N_MACHTYPE field */
/* These symbols could be defined by code from Suns...punt 'em */
#undef M_UNKNOWN
#undef M_68010
#undef M_68020
#undef M_SPARC
enum machine_type {
	M_UNKNOWN = 0,
	M_68010 = 1,
	M_68020 = 2,
	M_SPARC = 3,
	/* skip a bunch so we don't run into any of sun's numbers */
	M_386 = 100,
	M_29K = 101,
	M_RS6000 = 102,	/* IBM RS/6000 */
	/* HP/BSD formats */
	M_HP200 = 200,	/* hp200 (68010) BSD binary */
	M_HP300 = 300,	/* hp300 (68020+68881) BSD binary */
	M_HPUX23 = 0x020C,	/* hp200/300 HPUX binary */
};

#define N_MAGIC(exec) ((exec).a_info & 0xffff)
#define N_MACHTYPE(exec) ((enum machine_type)(((exec).a_info >> 16) & 0xff))
#define N_FLAGS(exec) (((exec).a_info >> 24) & 0xff)
#define N_SET_INFO(exec, magic, type, flags) \
    ((exec).a_info = ((magic) & 0xffff) \
     | (((int)(type) & 0xff) << 16) \
     | (((flags) & 0xff) << 24))
#define N_SET_MAGIC(exec, magic) \
    ((exec).a_info = (((exec).a_info & 0xffff0000) | ((magic) & 0xffff)))

#define N_SET_MACHTYPE(exec, machtype) \
    ((exec).a_info = \
     ((exec).a_info&0xff00ffff) | ((((int)(machtype))&0xff) << 16))

#define N_SET_FLAGS(exec, flags) \
    ((exec).a_info = \
     ((exec).a_info&0x00ffffff) | (((flags) & 0xff) << 24))

/* Code indicating object file or impure executable.  */
#define OMAGIC 0407
/* Code indicating pure executable.  */
#define NMAGIC 0410
/* Code indicating demand-paged executable.  */
#define ZMAGIC 0413

/* Virtual Address of text segment from the a.out file.  For OMAGIC,
   (almost always "unlinked .o's" these days), should be zero.
   For linked files, should reflect reality if we know it.  */

#ifndef N_TXTADDR
#define N_TXTADDR(x)	(N_MAGIC(x)==OMAGIC? 0 : TEXT_START_ADDR)
#endif

#ifndef N_BADMAG
#define N_BADMAG(x)	  (N_MAGIC(x) != OMAGIC		\
			   && N_MAGIC(x) != NMAGIC		\
			   && N_MAGIC(x) != ZMAGIC)
#endif

/* By default, segment size is constant.  But on some machines, it can
   be a function of the a.out header (e.g. machine type).  */
#ifndef	N_SEGSIZE
#define	N_SEGSIZE(x)	SEGMENT_SIZE
#endif
    
    /* This complexity is for encapsulated COFF support */
#ifndef _N_HDROFF
#define _N_HDROFF(x)	(N_SEGSIZE(x) - sizeof (struct exec))
#endif

#ifndef N_TXTOFF
#define N_TXTOFF(x)	(N_MAGIC(x) == ZMAGIC ?	\
			 _N_HDROFF((x)) + sizeof (struct exec) :	\
			 sizeof (struct exec))
#endif


#ifndef N_DATOFF
#define N_DATOFF(x)	( N_TXTOFF(x) + (x).a_text )
#endif

#ifndef N_TRELOFF
#define N_TRELOFF(x)	( N_DATOFF(x) + (x).a_data )
#endif

#ifndef N_DRELOFF
#define N_DRELOFF(x)	( N_TRELOFF(x) + (x).a_trsize )
#endif

#ifndef N_SYMOFF
#define N_SYMOFF(x)	( N_DRELOFF(x) + (x).a_drsize )
#endif

#ifndef N_STROFF
#define N_STROFF(x)	( N_SYMOFF(x) + (x).a_syms )
#endif

/* Address of text segment in memory after it is loaded.  */
#ifndef N_TXTADDR
#define	N_TXTADDR(x)	0
#endif
    
#ifndef N_DATADDR
#define N_DATADDR(x) \
    (N_MAGIC(x)==OMAGIC? (N_TXTADDR(x)+(x).a_text) \
     :  (N_SEGSIZE(x) + ((N_TXTADDR(x)+(x).a_text-1) & ~(N_SEGSIZE(x)-1))))
#endif

/* Address of bss segment in memory after it is loaded.  */
#define N_BSSADDR(x) (N_DATADDR(x) + (x).a_data)
\f
struct nlist {
	union {
		char *n_name;
		struct nlist *n_next;
		long n_strx;
	} n_un;
	unsigned char n_type;
	char n_other;
	short n_desc;
	unsigned long n_value;
};

#define N_UNDF 0
#define N_ABS 2
#define N_TEXT 4
#define N_DATA 6
#define N_BSS 8
#define	N_COMM	0x12		/* common (visible in shared lib commons) */
#define N_FN 0x1F		/* File name of a .o file */

/* Note: N_EXT can only usefully be OR-ed with N_UNDF, N_ABS, N_TEXT,
   N_DATA, or N_BSS.  When the low-order bit of other types is set,
   (e.g. N_WARNING versus N_FN), they are two different types.  */
#define N_EXT 1
#define N_TYPE 036
#define N_STAB 0340

/* The following type indicates the definition of a symbol as being
   an indirect reference to another symbol.  The other symbol
   appears as an undefined reference, immediately following this symbol.
   
   Indirection is asymmetrical.  The other symbol's value will be used
   to satisfy requests for the indirect symbol, but not vice versa.
   If the other symbol does not have a definition, libraries will
   be searched to find a definition.  */

#define N_INDR 0xa

/* The following symbols refer to set elements.
   All the N_SET[ATDB] symbols with the same name form one set.
   Space is allocated for the set in the text section, and each set
   element's value is stored into one word of the space.
   The first word of the space is the length of the set (number of elements).
   
   The address of the set is made into an N_SETV symbol
   whose name is the same as the name of the set.
   This symbol acts like a N_DATA global symbol
   in that it can satisfy undefined external references.  */

/* These appear as input to LD, in a .o file.  */
#define	N_SETA	0x14		/* Absolute set element symbol */
#define	N_SETT	0x16		/* Text set element symbol */
#define	N_SETD	0x18		/* Data set element symbol */
#define	N_SETB	0x1A		/* Bss set element symbol */

/* This is output from LD.  */
#define N_SETV	0x1C		/* Pointer to set vector in data area.  */

/* Warning symbol. The text gives a warning message, the next symbol
   in the table will be undefined. When the symbol is referenced, the
   message is printed.  */

#define	N_WARNING 0x1e
\f
/* This structure describes a single relocation to be performed.
   The text-relocation section of the file is a vector of these structures,
   all of which apply to the text section.
   Likewise, the data-relocation section applies to the data section.  */

/* The following enum and struct were borrowed from SunOS's
   /usr/include/sun4/a.out.h  and extended to handle
   other machines.  It is currently used on SPARC and AMD 29000.
   
   reloc_ext_bytes is how it looks on disk.  reloc_info_extended is
   how we might process it on a native host.  */

struct reloc_ext_bytes {
	unsigned char	r_address[4];
	unsigned char r_index[3];
	unsigned char r_bits[1];
	unsigned char r_addend[4];
};

#define	RELOC_EXT_BITS_EXTERN_BIG	0x80
#define	RELOC_EXT_BITS_EXTERN_LITTLE	0x01

#define	RELOC_EXT_BITS_TYPE_BIG		0x1F
#define	RELOC_EXT_BITS_TYPE_SH_BIG	0
#define	RELOC_EXT_BITS_TYPE_LITTLE	0xF8
#define	RELOC_EXT_BITS_TYPE_SH_LITTLE	3

#define	RELOC_EXT_SIZE	12		/* Bytes per relocation entry */

struct reloc_info_extended
{
	unsigned long r_address;
	unsigned int  r_index:24;
# define	r_symbolnum  r_index
	unsigned	r_extern:1;
	unsigned	:2;
	/*  RS/6000 compiler does not support enum bitfield 
	    enum reloc_type r_type:5; */
	enum reloc_type r_type;
	long int	r_addend;
};

/* The standard, old-fashioned, Berkeley compatible relocation struct */

struct reloc_std_bytes {
	unsigned char	r_address[4];
	unsigned char r_index[3];
	unsigned char r_bits[1];
};

#define	RELOC_STD_BITS_PCREL_BIG	0x80
#define	RELOC_STD_BITS_PCREL_LITTLE	0x01

#define	RELOC_STD_BITS_LENGTH_BIG	0x60
#define	RELOC_STD_BITS_LENGTH_SH_BIG	5	/* To shift to units place */
#define	RELOC_STD_BITS_LENGTH_LITTLE	0x06
#define	RELOC_STD_BITS_LENGTH_SH_LITTLE	1

#define	RELOC_STD_BITS_EXTERN_BIG	0x10
#define	RELOC_STD_BITS_EXTERN_LITTLE	0x08

#define	RELOC_STD_BITS_BASEREL_BIG	0x08
#define	RELOC_STD_BITS_BASEREL_LITTLE	0x08

#define	RELOC_STD_BITS_JMPTABLE_BIG	0x04
#define	RELOC_STD_BITS_JMPTABLE_LITTLE	0x04

#define	RELOC_STD_BITS_RELATIVE_BIG	0x02
#define	RELOC_STD_BITS_RELATIVE_LITTLE	0x02

#define	RELOC_STD_SIZE	8		/* Bytes per relocation entry */

#ifndef CUSTOM_RELOC_FORMAT
struct relocation_info
{
	/* Address (within segment) to be relocated.  */
	int r_address;
	/* The meaning of r_symbolnum depends on r_extern.  */
	unsigned int r_symbolnum:24;
	/* Nonzero means value is a pc-relative offset
	   and it should be relocated for changes in its own address
	   as well as for changes in the symbol or section specified.  */
	unsigned int r_pcrel:1;
	/* Length (as exponent of 2) of the field to be relocated.
	   Thus, a value of 2 indicates 1<<2 bytes.  */
	unsigned int r_length:2;
	/* 1 => relocate with value of symbol.
	   r_symbolnum is the index of the symbol
	   in file's the symbol table.
	   0 => relocate with the address of a segment.
	   r_symbolnum is N_TEXT, N_DATA, N_BSS or N_ABS
	   (the N_EXT bit may be set also, but signifies nothing).  */
	unsigned int r_extern:1;
	/* The next three bits are for SunOS shared libraries, and seem to
	   be undocumented.  */
	unsigned int r_baserel:1;	/* Linkage table relative */
	unsigned int r_jmptable:1;	/* pc-relative to jump table */
	
#ifdef TC_NS32K
#define r_bsr	r_baserel
#define r_disp	r_jmptable
#endif /* TC_NS32K */
	
	unsigned int r_relative:1;	/* "relative relocation" */
	/* unused */
	unsigned int r_pad:1;		/* Padding -- set to zero */
};
#endif /* CUSTOM_RELOC_FORMAT */

#endif /* __A_OUT_GNU_H__ */

/* end of a.out.gnu.h */
Commit	Line	Data
01170860 RP	1	/* This file is a.out.gnu.h
	2
	3	Copyright (C) 1987-1992 Free Software Foundation, Inc.
	4
	5	This file is part of GAS, the GNU Assembler.
	6
	7	GAS is free software; you can redistribute it and/or modify
	8	it under the terms of the GNU General Public License as published by
	9	the Free Software Foundation; either version 2, or (at your option)
	10	any later version.
	11
	12	GAS is distributed in the hope that it will be useful,
	13	but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	GNU General Public License for more details.
	16
	17	You should have received a copy of the GNU General Public License
	18	along with GAS; see the file COPYING. If not, write to
	19	the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
	20
61a153e5 RP	21	#ifndef __A_OUT_GNU_H__
	22	#define __A_OUT_GNU_H__
	23
af483be8	24	#include "aout/reloc.h"
61a153e5 RP	25
	26	#define __GNU_EXEC_MACROS__
	27
	28	#ifndef __STRUCT_EXEC_OVERRIDE__
	29
bad3df67 JG	30	/* This is the layout on disk of a Unix V7, Berkeley, SunOS, Vax Ultrix
	31	"struct exec". Don't assume that on this machine, the "struct exec"
	32	will lay out the same sizes or alignments. */
	33
	34	struct exec_bytes {
a39116f1 RP	35	unsigned char a_info[4];
	36	unsigned char a_text[4];
	37	unsigned char a_data[4];
	38	unsigned char a_bss[4];
	39	unsigned char a_syms[4];
	40	unsigned char a_entry[4];
	41	unsigned char a_trsize[4];
	42	unsigned char a_drsize[4];
bad3df67 JG	43	};
	44
	45	/* How big the "struct exec" is on disk */
	46	#define EXEC_BYTES_SIZE (8 * 4)
	47
	48	/* This is the layout in memory of a "struct exec" while we process it. */
	49
61a153e5 RP	50	struct exec
61a153e5 RP	51	{
a39116f1 RP	52	unsigned long a_info; /* Use macros N_MAGIC, etc for access */
	53	unsigned a_text; /* length of text, in bytes */
	54	unsigned a_data; /* length of data, in bytes */
	55	unsigned a_bss; /* length of uninitialized data area for file, in bytes */
	56	unsigned a_syms; /* length of symbol table data in file, in bytes */
	57	unsigned a_entry; /* start address */
	58	unsigned a_trsize; /* length of relocation info for text, in bytes */
	59	unsigned a_drsize; /* length of relocation info for data, in bytes */
61a153e5 RP	60	};
	61
	62	#endif /* __STRUCT_EXEC_OVERRIDE__ */
	63
	64	/* these go in the N_MACHTYPE field */
	65	/* These symbols could be defined by code from Suns...punt 'em */
bad3df67	66	#undef M_UNKNOWN
61a153e5 RP	67	#undef M_68010
	68	#undef M_68020
	69	#undef M_SPARC
	70	enum machine_type {
a39116f1 RP	71	M_UNKNOWN = 0,
	72	M_68010 = 1,
	73	M_68020 = 2,
	74	M_SPARC = 3,
	75	/* skip a bunch so we don't run into any of sun's numbers */
	76	M_386 = 100,
	77	M_29K = 101,
	78	M_RS6000 = 102, /* IBM RS/6000 */
	79	/* HP/BSD formats */
	80	M_HP200 = 200, /* hp200 (68010) BSD binary */
	81	M_HP300 = 300, /* hp300 (68020+68881) BSD binary */
	82	M_HPUX23 = 0x020C, /* hp200/300 HPUX binary */
61a153e5 RP	83	};
	84
	85	#define N_MAGIC(exec) ((exec).a_info & 0xffff)
	86	#define N_MACHTYPE(exec) ((enum machine_type)(((exec).a_info >> 16) & 0xff))
	87	#define N_FLAGS(exec) (((exec).a_info >> 24) & 0xff)
	88	#define N_SET_INFO(exec, magic, type, flags) \
a39116f1 RP	89	((exec).a_info = ((magic) & 0xffff) \
	90	\| (((int)(type) & 0xff) << 16) \
	91	\| (((flags) & 0xff) << 24))
61a153e5	92	#define N_SET_MAGIC(exec, magic) \
a39116f1	93	((exec).a_info = (((exec).a_info & 0xffff0000) \| ((magic) & 0xffff)))
61a153e5 RP	94
61a153e5 RP	95	#define N_SET_MACHTYPE(exec, machtype) \
a39116f1 RP	96	((exec).a_info = \
a39116f1 RP	97	((exec).a_info&0xff00ffff) \| ((((int)(machtype))&0xff) << 16))
61a153e5 RP	98
61a153e5 RP	99	#define N_SET_FLAGS(exec, flags) \
a39116f1 RP	100	((exec).a_info = \
a39116f1 RP	101	((exec).a_info&0x00ffffff) \| (((flags) & 0xff) << 24))
61a153e5 RP	102
	103	/* Code indicating object file or impure executable. */
	104	#define OMAGIC 0407
	105	/* Code indicating pure executable. */
	106	#define NMAGIC 0410
	107	/* Code indicating demand-paged executable. */
	108	#define ZMAGIC 0413
	109
bad3df67 JG	110	/* Virtual Address of text segment from the a.out file. For OMAGIC,
bad3df67 JG	111	(almost always "unlinked .o's" these days), should be zero.
bad3df67 JG	112	For linked files, should reflect reality if we know it. */
	113
	114	#ifndef N_TXTADDR
66d4e1bb JG	115	#define N_TXTADDR(x) (N_MAGIC(x)==OMAGIC? 0 : TEXT_START_ADDR)
	116	#endif
	117
	118	#ifndef N_BADMAG
	119	#define N_BADMAG(x) (N_MAGIC(x) != OMAGIC \
a39116f1 RP	120	&& N_MAGIC(x) != NMAGIC \
a39116f1 RP	121	&& N_MAGIC(x) != ZMAGIC)
66d4e1bb JG	122	#endif
66d4e1bb JG	123
d7f8f106 JG	124	/* By default, segment size is constant. But on some machines, it can
	125	be a function of the a.out header (e.g. machine type). */
	126	#ifndef N_SEGSIZE
	127	#define N_SEGSIZE(x) SEGMENT_SIZE
	128	#endif
a39116f1 RP	129
a39116f1 RP	130	/* This complexity is for encapsulated COFF support */
66d4e1bb	131	#ifndef _N_HDROFF
d7f8f106	132	#define _N_HDROFF(x) (N_SEGSIZE(x) - sizeof (struct exec))
66d4e1bb JG	133	#endif
	134
	135	#ifndef N_TXTOFF
	136	#define N_TXTOFF(x) (N_MAGIC(x) == ZMAGIC ? \
a39116f1 RP	137	_N_HDROFF((x)) + sizeof (struct exec) : \
a39116f1 RP	138	sizeof (struct exec))
66d4e1bb JG	139	#endif
	140
	141
	142	#ifndef N_DATOFF
	143	#define N_DATOFF(x) ( N_TXTOFF(x) + (x).a_text )
	144	#endif
	145
	146	#ifndef N_TRELOFF
	147	#define N_TRELOFF(x) ( N_DATOFF(x) + (x).a_data )
	148	#endif
	149
	150	#ifndef N_DRELOFF
	151	#define N_DRELOFF(x) ( N_TRELOFF(x) + (x).a_trsize )
bad3df67	152	#endif
61a153e5	153
66d4e1bb JG	154	#ifndef N_SYMOFF
66d4e1bb JG	155	#define N_SYMOFF(x) ( N_DRELOFF(x) + (x).a_drsize )
61a153e5	156	#endif
66d4e1bb JG	157
	158	#ifndef N_STROFF
	159	#define N_STROFF(x) ( N_SYMOFF(x) + (x).a_syms )
61a153e5	160	#endif
66d4e1bb JG	161
	162	/* Address of text segment in memory after it is loaded. */
	163	#ifndef N_TXTADDR
	164	#define N_TXTADDR(x) 0
61a153e5	165	#endif
a39116f1	166
61a153e5 RP	167	#ifndef N_DATADDR
61a153e5 RP	168	#define N_DATADDR(x) \
bad3df67	169	(N_MAGIC(x)==OMAGIC? (N_TXTADDR(x)+(x).a_text) \
d7f8f106	170	: (N_SEGSIZE(x) + ((N_TXTADDR(x)+(x).a_text-1) & ~(N_SEGSIZE(x)-1))))
61a153e5 RP	171	#endif
	172
	173	/* Address of bss segment in memory after it is loaded. */
	174	#define N_BSSADDR(x) (N_DATADDR(x) + (x).a_data)
	175	\f
	176	struct nlist {
a39116f1 RP	177	union {
	178	char *n_name;
	179	struct nlist *n_next;
	180	long n_strx;
	181	} n_un;
	182	unsigned char n_type;
	183	char n_other;
	184	short n_desc;
	185	unsigned long n_value;
61a153e5 RP	186	};
	187
	188	#define N_UNDF 0
	189	#define N_ABS 2
	190	#define N_TEXT 4
	191	#define N_DATA 6
	192	#define N_BSS 8
e557edcf	193	#define N_COMM 0x12 /* common (visible in shared lib commons) */
30c52cdf	194	#define N_FN 0x1F /* File name of a .o file */
61a153e5	195
30c52cdf JG	196	/* Note: N_EXT can only usefully be OR-ed with N_UNDF, N_ABS, N_TEXT,
	197	N_DATA, or N_BSS. When the low-order bit of other types is set,
	198	(e.g. N_WARNING versus N_FN), they are two different types. */
61a153e5 RP	199	#define N_EXT 1
	200	#define N_TYPE 036
	201	#define N_STAB 0340
	202
	203	/* The following type indicates the definition of a symbol as being
	204	an indirect reference to another symbol. The other symbol
	205	appears as an undefined reference, immediately following this symbol.
a39116f1	206
61a153e5 RP	207	Indirection is asymmetrical. The other symbol's value will be used
	208	to satisfy requests for the indirect symbol, but not vice versa.
	209	If the other symbol does not have a definition, libraries will
	210	be searched to find a definition. */
e929a4c5	211
9bbfd057	212	#define N_INDR 0xa
61a153e5 RP	213
	214	/* The following symbols refer to set elements.
	215	All the N_SET[ATDB] symbols with the same name form one set.
	216	Space is allocated for the set in the text section, and each set
	217	element's value is stored into one word of the space.
	218	The first word of the space is the length of the set (number of elements).
a39116f1	219
61a153e5 RP	220	The address of the set is made into an N_SETV symbol
	221	whose name is the same as the name of the set.
	222	This symbol acts like a N_DATA global symbol
	223	in that it can satisfy undefined external references. */
	224
	225	/* These appear as input to LD, in a .o file. */
	226	#define N_SETA 0x14 /* Absolute set element symbol */
	227	#define N_SETT 0x16 /* Text set element symbol */
	228	#define N_SETD 0x18 /* Data set element symbol */
	229	#define N_SETB 0x1A /* Bss set element symbol */
	230
	231	/* This is output from LD. */
	232	#define N_SETV 0x1C /* Pointer to set vector in data area. */
e557edcf JG	233
	234	/* Warning symbol. The text gives a warning message, the next symbol
	235	in the table will be undefined. When the symbol is referenced, the
	236	message is printed. */
	237
	238	#define N_WARNING 0x1e
61a153e5 RP	239	\f
	240	/* This structure describes a single relocation to be performed.
	241	The text-relocation section of the file is a vector of these structures,
	242	all of which apply to the text section.
	243	Likewise, the data-relocation section applies to the data section. */
	244
bad3df67 JG	245	/* The following enum and struct were borrowed from SunOS's
	246	/usr/include/sun4/a.out.h and extended to handle
	247	other machines. It is currently used on SPARC and AMD 29000.
a39116f1	248
bad3df67 JG	249	reloc_ext_bytes is how it looks on disk. reloc_info_extended is
bad3df67 JG	250	how we might process it on a native host. */
61a153e5	251
bad3df67	252	struct reloc_ext_bytes {
a39116f1 RP	253	unsigned char r_address[4];
	254	unsigned char r_index[3];
	255	unsigned char r_bits[1];
	256	unsigned char r_addend[4];
61a153e5 RP	257	};
61a153e5 RP	258
bad3df67 JG	259	#define RELOC_EXT_BITS_EXTERN_BIG 0x80
	260	#define RELOC_EXT_BITS_EXTERN_LITTLE 0x01
	261
	262	#define RELOC_EXT_BITS_TYPE_BIG 0x1F
	263	#define RELOC_EXT_BITS_TYPE_SH_BIG 0
	264	#define RELOC_EXT_BITS_TYPE_LITTLE 0xF8
	265	#define RELOC_EXT_BITS_TYPE_SH_LITTLE 3
	266
	267	#define RELOC_EXT_SIZE 12 /* Bytes per relocation entry */
61a153e5 RP	268
	269	struct reloc_info_extended
	270	{
a39116f1 RP	271	unsigned long r_address;
a39116f1 RP	272	unsigned int r_index:24;
61a153e5	273	# define r_symbolnum r_index
a39116f1 RP	274	unsigned r_extern:1;
	275	unsigned :2;
	276	/* RS/6000 compiler does not support enum bitfield
	277	enum reloc_type r_type:5; */
	278	enum reloc_type r_type;
	279	long int r_addend;
61a153e5 RP	280	};
61a153e5 RP	281
bad3df67 JG	282	/* The standard, old-fashioned, Berkeley compatible relocation struct */
	283
	284	struct reloc_std_bytes {
a39116f1 RP	285	unsigned char r_address[4];
	286	unsigned char r_index[3];
	287	unsigned char r_bits[1];
61a153e5 RP	288	};
61a153e5 RP	289
bad3df67 JG	290	#define RELOC_STD_BITS_PCREL_BIG 0x80
	291	#define RELOC_STD_BITS_PCREL_LITTLE 0x01
	292
	293	#define RELOC_STD_BITS_LENGTH_BIG 0x60
	294	#define RELOC_STD_BITS_LENGTH_SH_BIG 5 /* To shift to units place */
	295	#define RELOC_STD_BITS_LENGTH_LITTLE 0x06
	296	#define RELOC_STD_BITS_LENGTH_SH_LITTLE 1
	297
	298	#define RELOC_STD_BITS_EXTERN_BIG 0x10
	299	#define RELOC_STD_BITS_EXTERN_LITTLE 0x08
	300
	301	#define RELOC_STD_BITS_BASEREL_BIG 0x08
	302	#define RELOC_STD_BITS_BASEREL_LITTLE 0x08
	303
	304	#define RELOC_STD_BITS_JMPTABLE_BIG 0x04
	305	#define RELOC_STD_BITS_JMPTABLE_LITTLE 0x04
	306
	307	#define RELOC_STD_BITS_RELATIVE_BIG 0x02
	308	#define RELOC_STD_BITS_RELATIVE_LITTLE 0x02
61a153e5	309
bad3df67	310	#define RELOC_STD_SIZE 8 /* Bytes per relocation entry */
61a153e5	311
f0494a6e	312	#ifndef CUSTOM_RELOC_FORMAT
61a153e5 RP	313	struct relocation_info
61a153e5 RP	314	{
a39116f1 RP	315	/* Address (within segment) to be relocated. */
	316	int r_address;
	317	/* The meaning of r_symbolnum depends on r_extern. */
	318	unsigned int r_symbolnum:24;
	319	/* Nonzero means value is a pc-relative offset
	320	and it should be relocated for changes in its own address
	321	as well as for changes in the symbol or section specified. */
	322	unsigned int r_pcrel:1;
	323	/* Length (as exponent of 2) of the field to be relocated.
	324	Thus, a value of 2 indicates 1<<2 bytes. */
	325	unsigned int r_length:2;
	326	/* 1 => relocate with value of symbol.
	327	r_symbolnum is the index of the symbol
	328	in file's the symbol table.
	329	0 => relocate with the address of a segment.
	330	r_symbolnum is N_TEXT, N_DATA, N_BSS or N_ABS
	331	(the N_EXT bit may be set also, but signifies nothing). */
	332	unsigned int r_extern:1;
	333	/* The next three bits are for SunOS shared libraries, and seem to
	334	be undocumented. */
	335	unsigned int r_baserel:1; /* Linkage table relative */
	336	unsigned int r_jmptable:1; /* pc-relative to jump table */
	337
f827120d RP	338	#ifdef TC_NS32K
	339	#define r_bsr r_baserel
	340	#define r_disp r_jmptable
	341	#endif /* TC_NS32K */
a39116f1 RP	342
	343	unsigned int r_relative:1; /* "relative relocation" */
	344	/* unused */
	345	unsigned int r_pad:1; /* Padding -- set to zero */
61a153e5	346	};
f0494a6e	347	#endif /* CUSTOM_RELOC_FORMAT */
61a153e5	348
61a153e5	349	#endif /* __A_OUT_GNU_H__ */
a39116f1 RP	350
a39116f1 RP	351	/* end of a.out.gnu.h */