]>
code.delx.au - gnu-emacs/blob - src/m/iris4d.h
1 /* machine description file for Iris-4D machines. Use with s/irix*.h.
2 Copyright (C) 1987 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. */
21 /* The following three symbols give information on
22 the size of various data types. */
24 #define SHORTBITS 16 /* Number of bits in a short */
26 #define INTBITS 32 /* Number of bits in an int */
28 #define LONGBITS 32 /* Number of bits in a long */
30 /* Define WORDS_BIG_ENDIAN iff lowest-numbered byte in a word
31 is the most significant byte. */
33 #define WORDS_BIG_ENDIAN
35 /* Define NO_ARG_ARRAY if you cannot take the address of the first of a
36 * group of arguments and treat it as an array of the arguments. */
40 /* Define WORD_MACHINE if addresses and such have
41 * to be corrected before they can be used as byte counts. */
45 /* Now define a symbol for the cpu type, if your compiler
46 does not define it automatically:
47 Ones defined so far include vax, m68000, ns16000, pyramid,
48 orion, tahoe, APOLLO and many others */
58 /* Use type int rather than a union, to represent Lisp_Object */
59 /* This is desirable for most machines. */
63 /* Define EXPLICIT_SIGN_EXTEND if XINT must explicitly sign-extend
64 the bit field into an int. In other words, if bit fields
67 If you use NO_UNION_TYPE, this flag does not matter. */
69 #define EXPLICIT_SIGN_EXTEND
71 /* jg@genmagic.genmagic.com (John Giannandrea) says this is unnecessary. */
73 /* Data type of load average, as read out of kmem. */
75 #define LOAD_AVE_TYPE long /* This doesn't quite work on the 4D */
77 /* Convert that into an integer that is 100 for a load average of 1.0 */
79 #define LOAD_AVE_CVT(x) (int)(((double)(x)*100)/1024.0)
81 /* s-iris3-6.h uses /vmunix */
84 #define KERNEL_FILE "/unix"
87 /* Define CANNOT_DUMP on machines where unexec does not work.
88 Then the function dump-emacs will not be defined
89 and temacs will do (load "loadup") automatically unless told otherwise. */
93 /* Define VIRT_ADDR_VARIES if the virtual addresses of
94 pure and impure space as loaded can vary, and even their
95 relative order cannot be relied on.
97 Otherwise Emacs assumes that text space precedes data space,
100 /* #define VIRT_ADDR_VARIES */
102 /* Define C_ALLOCA if this machine does not support a true alloca
103 and the one written in C should be used instead.
104 Define HAVE_ALLOCA to say that the system provides a properly
105 working alloca function and it should be used.
106 Define neither one if an assembler-language alloca
107 in the file alloca.s should be used. */
109 /* #define C_ALLOCA */ /* Sjoerd.Mullender@cwi.nl says no need. */
110 /* #define HAVE_ALLOCA */
112 /* Define NO_REMAP if memory segmentation makes it not work well
113 to change the boundary between the text section and data section
114 when Emacs is dumped. If you define this, the preloaded Lisp
115 code will not be sharable; but that's better than failing completely. */
119 /* This machine requires completely different unexec code
120 which lives in a separate file. Specify the file name. */
124 #define UNEXEC unexelfsgi.o
126 #define UNEXEC unexmips.o
129 #define TEXT_START 0x400000
132 * DATA_SEG_BITS forces extra bits to be or'd in with any pointers which
133 * were stored in a Lisp_Object (as Emacs uses fewer than 32 bits for
134 * the value field of a LISP_OBJECT).
137 #define DATA_START 0x10000000
138 #define DATA_SEG_BITS 0x10000000
141 /* -lsun in case using Yellow Pages for passwords. */
142 #define LIBS_MACHINE -lmld
145 /* Define this if you have a fairly recent system,
146 in which crt1.o and crt1.n should be used. */
151 /* Must define START-FILES so that the linker can find /usr/lib/crt0.o. */
152 #define START_FILES pre-crt0.o /usr/lib/crt1.o
153 #define LIB_STANDARD -lc /usr/lib/crtn.o
155 #define START_FILES pre-crt0.o /usr/lib/crt0.o
156 /* The entry-point label (start of text segment) is `start', not `__start'. */
157 #define DEFAULT_ENTRY_ADDRESS start
158 #define LIB_STANDARD -lc
162 /* Use terminfo instead of termcap. */
166 /* Letter to use in finding device name of first pty,
167 if system supports pty's. 'a' means it is /dev/ptya0 */
169 #undef FIRST_PTY_LETTER
170 #define FIRST_PTY_LETTER 'q'
172 /* Define STACK_DIRECTION for alloca.c */
174 #undef STACK_DIRECTION
175 #define STACK_DIRECTION -1
177 /* The standard definitions of these macros would work ok,
178 but these are faster because the constants are short. */
180 #define XUINT(a) (((unsigned)(a) << INTBITS-VALBITS) >> INTBITS-VALBITS)
182 #define XSET(var, type, ptr) \
183 ((var) = ((int)(type) << VALBITS) + (((unsigned) (ptr) << INTBITS-VALBITS) >> INTBITS-VALBITS))
185 #define XMARKBIT(a) ((a) < 0)
186 #define XSETMARKBIT(a,b) ((a) = ((a) & ~MARKBIT) | ((b) ? MARKBIT : 0))
187 #define XUNMARK(a) ((a) = (((unsigned)(a) << INTBITS-GCTYPEBITS-VALBITS) >> INTBITS-GCTYPEBITS-VALBITS))
190 /* Turn off some "helpful" error checks for type mismatches
191 that we can't fix without breaking other machines. */
192 #ifdef IRIX_FORCE_32_BITS
193 #define C_SWITCH_MACHINE -32
196 #endif /* not __GNUC__ */