1/* COFF spec for AMD 290*0
2
3   Copyright 2001 Free Software Foundation, Inc.
4
5   This program is free software; you can redistribute it and/or modify
6   it under the terms of the GNU General Public License as published by
7   the Free Software Foundation; either version 2 of the License, or
8   (at your option) any later version.
9
10   This program is distributed in the hope that it will be useful,
11   but WITHOUT ANY WARRANTY; without even the implied warranty of
12   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13   GNU General Public License for more details.
14
15   You should have received a copy of the GNU General Public License
16   along with this program; if not, write to the Free Software
17   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
18
19   Contributed by David Wood @ New York University. */
20
21#ifndef AMD
22# define AMD
23#endif
24
25#define L_LNNO_SIZE 2
26#include "coff/external.h"
27
28/*
29** Magic numbers for Am29000
30**	(AT&T will assign the "real" magic number)
31*/
32
33#define SIPFBOMAGIC     0572    /* Am29000 (Byte 0 is MSB) */
34#define SIPRBOMAGIC     0573    /* Am29000 (Byte 0 is LSB) */
35
36#define A29K_MAGIC_BIG 		SIPFBOMAGIC
37#define A29K_MAGIC_LITTLE	SIPRBOMAGIC
38#define A29KBADMAG(x) 	( ((x).f_magic != A29K_MAGIC_BIG) && \
39			  ((x).f_magic != A29K_MAGIC_LITTLE))
40
41#define OMAGIC A29K_MAGIC_BIG
42/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -*/
43
44/*
45** File header flags currently known to us.
46**
47** Am29000 will use the F_AR32WR and F_AR32W flags to indicate
48** the byte ordering in the file.
49*/
50
51/*--------------------------------------------------------------*/
52
53
54/* aouthdr magic numbers */
55#define NMAGIC		0410	/* separate i/d executable */
56#define SHMAGIC	0406		/* NYU/Ultra3 shared data executable
57				   (writable text) */
58#undef  _ETEXT
59#define _ETEXT   	"_etext"
60
61/*--------------------------------------------------------------*/
62
63
64/* More names of "special" sections.  */
65#define _LIT	".lit"
66
67/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -*/
68
69/*
70** Section types - with additional section type for global
71** registers which will be relocatable for the Am29000.
72**
73** In instances where it is necessary for a linker to produce an
74** output file which contains text or data not based at virtual
75** address 0, e.g. for a ROM, then the linker should accept
76** address base information as command input and use PAD sections
77** to skip over unused addresses.
78*/
79
80#define	STYP_BSSREG	0x1200	/* Global register area (like STYP_INFO) */
81#define STYP_ENVIR	0x2200	/* Environment (like STYP_INFO) */
82#define STYP_ABS	0x4000	/* Absolute (allocated, not reloc, loaded) */
83
84/*--------------------------------------------------------------*/
85
86/*
87** Relocation information declaration and related definitions
88*/
89
90struct external_reloc
91{
92  char r_vaddr[4];	/* (virtual) address of reference */
93  char r_symndx[4];	/* index into symbol table */
94  char r_type[2];	/* relocation type */
95};
96
97#define	RELOC		struct external_reloc
98#define	RELSZ		10		/* sizeof (RELOC) */
99
100/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -*/
101
102/*
103** Relocation types for the Am29000
104*/
105
106#define	R_ABS		0	/* reference is absolute */
107
108#define	R_IREL		030	/* instruction relative (jmp/call) */
109#define	R_IABS		031	/* instruction absolute (jmp/call) */
110#define	R_ILOHALF	032	/* instruction low half  (const)  */
111#define	R_IHIHALF	033	/* instruction high half (consth) part 1 */
112#define	R_IHCONST	034	/* instruction high half (consth) part 2 */
113				/* constant offset of R_IHIHALF relocation */
114#define	R_BYTE		035	/* relocatable byte value */
115#define R_HWORD		036	/* relocatable halfword value */
116#define R_WORD		037	/* relocatable word value */
117
118#define	R_IGLBLRC	040	/* instruction global register RC */
119#define	R_IGLBLRA	041	/* instruction global register RA */
120#define	R_IGLBLRB	042	/* instruction global register RB */
121
122/*
123NOTE:
124All the "I" forms refer to 29000 instruction formats.  The linker is
125expected to know how the numeric information is split and/or aligned
126within the instruction word(s).  R_BYTE works for instructions, too.
127
128If the parameter to a CONSTH instruction is a relocatable type, two
129relocation records are written.  The first has an r_type of R_IHIHALF
130(33 octal) and a normal r_vaddr and r_symndx.  The second relocation
131record has an r_type of R_IHCONST (34 octal), a normal r_vaddr (which
132is redundant), and an r_symndx containing the 32-bit constant offset
133to the relocation instead of the actual symbol table index.  This
134second record is always written, even if the constant offset is zero.
135The constant fields of the instruction are set to zero.
136*/
137
138/*--------------------------------------------------------------*/
139
140/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -*/
141
142/*
143** Storage class definitions - new classes for global registers.
144*/
145
146#define C_GLBLREG	19		/* global register */
147#define C_EXTREG	20		/* external global register */
148#define	C_DEFREG	21		/* ext. def. of global register */
149