1/* Machine description file for Acorn RISCiX machines.
2   Copyright (C) 1994, 2001, 2002, 2003, 2004, 2005,
3                 2006, 2007  Free Software Foundation, Inc.
4
5This file is part of GNU Emacs.
6
7GNU Emacs is free software; you can redistribute it and/or modify
8it under the terms of the GNU General Public License as published by
9the Free Software Foundation; either version 2, or (at your option)
10any later version.
11
12GNU Emacs is distributed in the hope that it will be useful,
13but WITHOUT ANY WARRANTY; without even the implied warranty of
14MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15GNU General Public License for more details.
16
17You should have received a copy of the GNU General Public License
18along with GNU Emacs; see the file COPYING.  If not, write to
19the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
20Boston, MA 02110-1301, USA.  */
21
22
23
24/* Define WORDS_BIG_ENDIAN iff lowest-numbered byte in a word
25   is the most significant byte.  */
26
27#undef WORDS_BIG_ENDIAN
28
29/* Define NO_ARG_ARRAY if you cannot take the address of the first of a
30 * group of arguments and treat it as an array of the arguments.  We can't
31 * do this on the arm with gcc, since the first 4 args are in registers.  */
32
33#ifdef __GNUC__
34#define NO_ARG_ARRAY
35#else
36#undef NO_ARG_ARRAY
37#endif
38
39/* Define WORD_MACHINE if addresses and such have
40 * to be corrected before they can be used as byte counts.  */
41
42#undef WORD_MACHINE
43
44/* Define how to take a char and sign-extend into an int.
45   On machines where char is signed, this is a no-op.  */
46
47/* ARM note - The RISCiX Norcroft C Compiler has ALL
48   non-32-bit types as unsigned */
49
50#define SIGN_EXTEND_CHAR(c) (((int)(c) << 24) >> 24)
51
52/* Now define a symbol for the cpu type, if your compiler
53   does not define it automatically:
54   Ones defined so far include vax, m68000, ns16000, pyramid,
55   orion, tahoe, APOLLO and many others */
56
57/* ARM note - this is done by the Norcroft compiler - symbol is `__arm' */
58
59/* Use type int rather than a union, to represent Lisp_Object */
60/* This is desirable for most machines.  */
61
62#define NO_UNION_TYPE
63
64/* Define EXPLICIT_SIGN_EXTEND if XINT must explicitly sign-extend
65   the 24-bit bit field into an int.  In other words, if bit fields
66   are always unsigned.
67
68   If you use NO_UNION_TYPE, this flag does not matter.  */
69
70#define EXPLICIT_SIGN_EXTEND
71
72#ifdef LDAV_SYMBOL
73#undef LDAV_SYMBOL
74#endif
75
76#define LDAV_SYMBOL "_iavenrun"
77
78
79/* Data type of load average, as read out of kmem.  */
80
81#define LOAD_AVE_TYPE long
82
83/* Convert that into an integer that is 100 for a load average of 1.0  */
84
85/*
86 * Scale factor for scaled integers used to count
87 * %cpu time and load averages.
88 */
89
90/* FSHIFT and FSCALE are defined in param.h, but are required by
91   LOAD_AVE_CVT, so they need to be defined here.  */
92
93#ifndef FSHIFT
94#define FSHIFT	8	/* bits to right of fixed binary point */
95#endif
96
97#ifndef FSCALE
98#define FSCALE	(1<<FSHIFT)
99#endif
100
101#define LOAD_AVE_CVT(x) (int) (((double) (x)) * 100.0 / FSCALE)
102
103/* Define CANNOT_DUMP on machines where unexec does not work.
104   Then the function dump-emacs will not be defined
105   and temacs will do (load "loadup") automatically unless told otherwise.  */
106
107#undef CANNOT_DUMP
108
109/* Define VIRT_ADDR_VARIES if the virtual addresses of
110   pure and impure space as loaded can vary, and even their
111   relative order cannot be relied on.
112
113   Otherwise Emacs assumes that text space precedes data space,
114   numerically.  */
115
116#undef VIRT_ADDR_VARIES
117
118/* This prevents Emacs dumping an unsqueezed binary with the
119   SQUEEZE bit set in the magic number. */
120
121#define ADJUST_EXEC_HEADER {hdr.a_magic &= ~MF_SQUEEZED;}
122
123#ifdef __GNUC__
124
125/* Keep gcc/RISCiX happy - it uses __gccmain where other versions of
126   gcc use __main, because of a library routine name clash. */
127#define __main __gccmain
128
129#endif  /* __GNUC__ */
130
131/* Define NO_REMAP if memory segmentation makes it not work well
132   to change the boundary between the text section and data section
133   when Emacs is dumped.  If you define this, the preloaded Lisp
134   code will not be sharable; but that's better than failing completely.  */
135
136#define NO_REMAP
137
138
139#ifndef NOT_C_CODE
140#define TEXT_START	0x8000
141#define DATA_END	&_edata
142extern int _edata;
143#define etext _etext
144#endif
145
146/* Avoid debugging library */
147#define LIBS_DEBUG
148
149/* Avoid sharing libc */
150#define LIB_STANDARD -lc_n
151
152/* Avoid sharing libX11 */
153#define LIB_X11_LIB -lX11_n
154
155/* All kinds of symbol definitions, so as to avoid multiply defined symbol
156   errors from the RISCiX linker. */
157
158#ifdef __GNUC__
159#define C_DEBUG_SWITCH
160
161#define C_OPTIMIZE_SWITCH -O1 -fomit-frame-pointer -w -g -Dgetopt=gnu_getopt -Dopterr=gnu_opterr -Doptind=gnu_optind -Doptarg=gnu_optarg -Dcfree=gnu_cfree -D___type=
162
163#else
164#define C_DEBUG_SWITCH -O -w -g -Dgetopt=gnu_getopt -Dopterr=gnu_opterr -Doptind=gnu_optind -Doptarg=gnu_optarg -Dcfree=gnu_cfree
165#endif
166
167/* Turn this on to avoid the emacs malloc and use standard one */
168
169#undef SYSTEM_MALLOC
170
171/* Use <dirent.h>. */
172#define SYSV_SYSTEM_DIR
173
174#ifdef NO_REMAP
175/* CRT0_O is defined in s/riscix1-1.h or s/riscix1-2.h, as appropriate. */
176#define START_FILES pre-crt0.o CRT0_O
177#else
178Cannot
179do
180this
181yet
182#endif
183
184/* arch-tag: acee2955-8c49-4b40-813c-579f76f4c0c3
185   (do not change this comment) */
186