1 /* Machine description file for Acorn RISCiX machines.
2 Copyright (C) 1994 Free Software Foundation, Inc.
4 This file is part of GNU Emacs.
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)
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.
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. */
22 /* Define WORDS_BIG_ENDIAN iff lowest-numbered byte in a word
23 is the most significant byte. */
25 #undef WORDS_BIG_ENDIAN
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. */
37 /* Define WORD_MACHINE if addresses and such have
38 * to be corrected before they can be used as byte counts. */
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. */
45 /* ARM note - The RISCiX Norcroft C Compiler has ALL
46 non-32-bit types as unsigned */
48 #define SIGN_EXTEND_CHAR(c) (((int)(c) << 24) >> 24)
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 */
55 /* ARM note - this is done by the Norcroft compiler - symbol is `__arm' */
57 /* Use type int rather than a union, to represent Lisp_Object */
58 /* This is desirable for most machines. */
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
66 If you use NO_UNION_TYPE, this flag does not matter. */
68 #define EXPLICIT_SIGN_EXTEND
74 #define LDAV_SYMBOL "_iavenrun"
77 /* Data type of load average, as read out of kmem. */
79 #define LOAD_AVE_TYPE long
81 /* Convert that into an integer that is 100 for a load average of 1.0 */
84 * Scale factor for scaled integers used to count
85 * %cpu time and load averages.
88 /* FSHIFT and FSCALE are defined in param.h, but are required by
89 LOAD_AVE_CVT, so they need to be defined here. */
92 #define FSHIFT 8 /* bits to right of fixed binary point */
96 #define FSCALE (1<<FSHIFT)
99 #define LOAD_AVE_CVT(x) (int) (((double) (x)) * 100.0 / FSCALE)
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. */
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.
111 Otherwise Emacs assumes that text space precedes data space,
114 #undef VIRT_ADDR_VARIES
116 /* This prevents Emacs dumping an unsqueezed binary with the
117 SQUEEZE bit set in the magic number. */
119 #define ADJUST_EXEC_HEADER {hdr.a_magic &= ~MF_SQUEEZED;}
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. */
130 /* Use builtin alloca. Also be sure that no other ones are tried out. */
131 #define alloca __builtin_alloca
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
141 #endif /* __GNUC__ */
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. */
152 #define TEXT_START 0x8000
153 #define DATA_END &_edata
158 /* Avoid debugging library */
161 /* Avoid sharing libc */
162 #define LIB_STANDARD -lc_n
164 /* Avoid sharing libX11 */
165 #define LIB_X11_LIB -lX11_n
167 /* All kinds of symbol definitions, so as to avoid multiply defined symbol
168 errors from the RISCiX linker. */
171 #define C_DEBUG_SWITCH
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=
176 #define C_DEBUG_SWITCH -O -w -g -Dgetopt=gnu_getopt -Dopterr=gnu_opterr -Doptind=gnu_optind -Doptarg=gnu_optarg -Dcfree=gnu_cfree
179 /* Turn this on to avoid the emacs malloc and use standard one */
183 /* Use <dirent.h>. */
184 #define SYSV_SYSTEM_DIR
186 /* For the portable alloca */
187 #define STACK_DIRECTION -1
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