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1 | /* Machine description file for Acorn RISCiX machines. |
2 | Copyright (C) 1994 Free Software Foundation, Inc. | |
3 | ||
4 | This file is part of GNU Emacs. | |
5 | ||
6 | GNU Emacs is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2, or (at your option) | |
9 | any later version. | |
10 | ||
11 | GNU Emacs is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with GNU Emacs; see the file COPYING. If not, write to | |
18 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
19 | ||
20 | ||
21 | ||
74d3f806 | 22 | /* Define WORDS_BIG_ENDIAN iff lowest-numbered byte in a word |
f3cc1007 RS |
23 | is the most significant byte. */ |
24 | ||
74d3f806 | 25 | #undef WORDS_BIG_ENDIAN |
f3cc1007 RS |
26 | |
27 | /* Define NO_ARG_ARRAY if you cannot take the address of the first of a | |
28 | * group of arguments and treat it as an array of the arguments. We can't | |
29 | * do this on the arm with gcc, since the first 4 args are in registers. */ | |
30 | ||
31 | #ifdef __GNUC__ | |
32 | #define NO_ARG_ARRAY | |
33 | #else | |
34 | #undef NO_ARG_ARRAY | |
35 | #endif | |
36 | ||
37 | /* Define WORD_MACHINE if addresses and such have | |
38 | * to be corrected before they can be used as byte counts. */ | |
39 | ||
40 | #undef WORD_MACHINE | |
41 | ||
42 | /* Define how to take a char and sign-extend into an int. | |
43 | On machines where char is signed, this is a no-op. */ | |
44 | ||
45 | /* ARM note - The RISCiX Norcroft C Compiler has ALL | |
46 | non-32-bit types as unsigned */ | |
47 | ||
48 | #define SIGN_EXTEND_CHAR(c) (((int)(c) << 24) >> 24) | |
49 | ||
50 | /* Now define a symbol for the cpu type, if your compiler | |
51 | does not define it automatically: | |
52 | Ones defined so far include vax, m68000, ns16000, pyramid, | |
53 | orion, tahoe, APOLLO and many others */ | |
54 | ||
55 | /* ARM note - this is done by the Norcroft compiler - symbol is `__arm' */ | |
56 | ||
57 | /* Use type int rather than a union, to represent Lisp_Object */ | |
58 | /* This is desirable for most machines. */ | |
59 | ||
60 | #define NO_UNION_TYPE | |
61 | ||
62 | /* Define EXPLICIT_SIGN_EXTEND if XINT must explicitly sign-extend | |
63 | the 24-bit bit field into an int. In other words, if bit fields | |
64 | are always unsigned. | |
65 | ||
66 | If you use NO_UNION_TYPE, this flag does not matter. */ | |
67 | ||
68 | #define EXPLICIT_SIGN_EXTEND | |
69 | ||
70 | #ifdef LDAV_SYMBOL | |
71 | #undef LDAV_SYMBOL | |
72 | #endif | |
73 | ||
74 | #define LDAV_SYMBOL "_iavenrun" | |
75 | ||
76 | ||
77 | /* Data type of load average, as read out of kmem. */ | |
78 | ||
79 | #define LOAD_AVE_TYPE long | |
80 | ||
81 | /* Convert that into an integer that is 100 for a load average of 1.0 */ | |
82 | ||
83 | /* | |
84 | * Scale factor for scaled integers used to count | |
85 | * %cpu time and load averages. | |
86 | */ | |
87 | ||
88 | /* FSHIFT and FSCALE are defined in param.h, but are required by | |
89 | LOAD_AVE_CVT, so they need to be defined here. */ | |
90 | ||
91 | #ifndef FSHIFT | |
92 | #define FSHIFT 8 /* bits to right of fixed binary point */ | |
93 | #endif | |
94 | ||
95 | #ifndef FSCALE | |
96 | #define FSCALE (1<<FSHIFT) | |
97 | #endif | |
98 | ||
99 | #define LOAD_AVE_CVT(x) (int) (((double) (x)) * 100.0 / FSCALE) | |
100 | ||
101 | /* Define CANNOT_DUMP on machines where unexec does not work. | |
102 | Then the function dump-emacs will not be defined | |
103 | and temacs will do (load "loadup") automatically unless told otherwise. */ | |
104 | ||
105 | #undef CANNOT_DUMP | |
106 | ||
107 | /* Define VIRT_ADDR_VARIES if the virtual addresses of | |
108 | pure and impure space as loaded can vary, and even their | |
109 | relative order cannot be relied on. | |
110 | ||
111 | Otherwise Emacs assumes that text space precedes data space, | |
112 | numerically. */ | |
113 | ||
114 | #undef VIRT_ADDR_VARIES | |
115 | ||
116 | /* This prevents Emacs dumping an unsqueezed binary with the | |
117 | SQUEEZE bit set in the magic number. */ | |
118 | ||
119 | #define ADJUST_EXEC_HEADER {hdr.a_magic &= ~MF_SQUEEZED;} | |
120 | ||
121 | /* Define C_ALLOCA if this machine does not support a true alloca | |
122 | and the one written in C should be used instead. | |
123 | Define HAVE_ALLOCA to say that the system provides a properly | |
124 | working alloca function and it should be used. | |
125 | Define neither one if an assembler-language alloca | |
126 | in the file alloca.s should be used. */ | |
127 | ||
128 | #ifdef __GNUC__ | |
129 | ||
130 | /* Use builtin alloca. Also be sure that no other ones are tried out. */ | |
131 | #define alloca __builtin_alloca | |
132 | #define HAVE_ALLOCA | |
133 | ||
134 | /* Keep gcc/RISCiX happy - it uses __gccmain where other versions of | |
135 | gcc use __main, because of a library routine name clash. */ | |
136 | #define __main __gccmain | |
137 | ||
138 | #else | |
139 | #define C_ALLOCA | |
140 | #undef HAVE_ALLOCA | |
141 | #endif /* __GNUC__ */ | |
142 | ||
143 | /* Define NO_REMAP if memory segmentation makes it not work well | |
144 | to change the boundary between the text section and data section | |
145 | when Emacs is dumped. If you define this, the preloaded Lisp | |
146 | code will not be sharable; but that's better than failing completely. */ | |
147 | ||
148 | #define NO_REMAP | |
149 | ||
150 | ||
151 | #ifndef NOT_C_CODE | |
152 | #define TEXT_START 0x8000 | |
153 | #define DATA_END &_edata | |
154 | extern int _edata; | |
155 | #define etext _etext | |
156 | #endif | |
157 | ||
158 | /* Avoid debugging library */ | |
159 | #define LIBS_DEBUG | |
160 | ||
161 | /* Avoid sharing libc */ | |
162 | #define LIB_STANDARD -lc_n | |
163 | ||
164 | /* Avoid sharing libX11 */ | |
165 | #define LIB_X11_LIB -lX11_n | |
166 | ||
167 | /* All kinds of symbol definitions, so as to avoid multiply defined symbol | |
168 | errors from the RISCiX linker. */ | |
169 | ||
170 | #ifdef __GNUC__ | |
171 | #define C_DEBUG_SWITCH | |
172 | ||
173 | #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= | |
174 | ||
175 | #else | |
176 | #define C_DEBUG_SWITCH -O -w -g -Dgetopt=gnu_getopt -Dopterr=gnu_opterr -Doptind=gnu_optind -Doptarg=gnu_optarg -Dcfree=gnu_cfree | |
177 | #endif | |
178 | ||
179 | /* Turn this on to avoid the emacs malloc and use standard one */ | |
180 | ||
181 | #undef SYSTEM_MALLOC | |
182 | ||
183 | /* Use <dirent.h>. */ | |
184 | #define SYSV_SYSTEM_DIR | |
185 | ||
f3cc1007 RS |
186 | /* For the portable alloca */ |
187 | #define STACK_DIRECTION -1 | |
188 | ||
189 | #ifdef NO_REMAP | |
190 | /* CRT0_O is defined in s/riscix1-1.h or s/riscix1-2.h, as appropriate. */ | |
191 | #define START_FILES pre-crt0.o CRT0_O | |
192 | #else | |
193 | Cannot | |
194 | do | |
195 | this | |
196 | yet | |
197 | #endif |