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1.1 root 1: /* RTPC machine dependent defines
2: Copyright (C) 1986 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 1, 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: /* The following three symbols give information on
22: the size of various data types. */
23:
24: #define SHORTBITS 16 /* Number of bits in a short */
25:
26: #define INTBITS 32 /* Number of bits in an int */
27:
28: #define LONGBITS 32 /* Number of bits in a long */
29:
30: /* Define BIG_ENDIAN iff lowest-numbered byte in a word
31: is the most significant byte. */
32:
33: #define BIG_ENDIAN
34:
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. */
37:
38: #define NO_ARG_ARRAY
39:
40: /* Define WORD_MACHINE if addresses and such have
41: * to be corrected before they can be used as byte counts. */
42:
43: #define WORD_MACHINE
44:
45: /* Define how to take a char and sign-extend into an int.
46: On machines where char is signed, this is a no-op. */
47:
48: #define SIGN_EXTEND_CHAR(c) ((signed char)(c))
49:
50: /* Now define a symbol for the cpu type, if your compiler
51: does not define it automatically. */
52:
53: #define ibmrt
54: #define romp /* unfortunately old include files are hanging around. */
55:
56: /* Use type int rather than a union, to represent Lisp_Object */
57: /* This is desirable for most machines. */
58:
59: #define NO_UNION_TYPE
60:
61: /* Define EXPLICIT_SIGN_EXTEND if XINT must explicitly sign-extend
62: the 24-bit bit field into an int. In other words, if bit fields
63: are always unsigned.
64:
65: If you use NO_UNION_TYPE, this flag does not matter. */
66:
67: #define EXPLICIT_SIGN_EXTEND
68:
69: /* Data type of load average, as read out of kmem. */
70:
71: #define LOAD_AVE_TYPE double /* For AIS (sysV) */
72:
73: /* Convert that into an integer that is 100 for a load average of 1.0 */
74:
75: #define LOAD_AVE_CVT(x) (int) (((double) (x)) * 100.0)
76:
77: /* Define CANNOT_DUMP on machines where unexec does not work.
78: Then the function dump-emacs will not be defined
79: and temacs will do (load "loadup") automatically unless told otherwise. */
80:
81: /* #define CANNOT_DUMP */
82:
83: /* Define VIRT_ADDR_VARIES if the virtual addresses of
84: pure and impure space as loaded can vary, and even their
85: relative order cannot be relied on.
86:
87: Otherwise Emacs assumes that text space precedes data space,
88: numerically. */
89:
90: #undef VIRT_ADDR_VARIES
91:
92: /* Define C_ALLOCA if this machine does not support a true alloca
93: and the one written in C should be used instead.
94: Define HAVE_ALLOCA to say that the system provides a properly
95: working alloca function and it should be used.
96: Define neither one if an assembler-language alloca
97: in the file alloca.s should be used. */
98:
99: #define HAVE_ALLOCA
100:
101: /* The data segment in this machine starts at a fixed address.
102: An address of data cannot be stored correctly in a Lisp object;
103: we always lose the high bits. We must tell XPNTR to add them back. */
104:
105: #define DATA_SEG_BITS 0x10000000
106: #define DATA_START 0x10000000
107:
108: /* The text segment always starts at a fixed address.
109: This way we don't need to have a label _start defined. */
110: #define TEXT_START 0
111:
112: #define VALBITS 26
113: #define GCTYPEBITS 5
114:
115: /* Taking a pointer to a char casting it as int pointer */
116: /* and then taking the int which the int pointer points to */
117: /* is practically guaranteed to give erroneous results */
118:
119: #define NEED_ERRNO
120:
121: #define SKTPAIR
122:
123: /* BSD has BSTRING. */
124:
125: #define BSTRING
126:
127: /* Special switches to give the C compiler. */
128:
129: #define C_SWITCH_MACHINE -Dalloca=_Alloca
130:
131: /* Don't attempt to relabel some of the data as text when dumping.
132: It does not work because their virtual addresses are not consecutive.
133: This enables us to use the standard crt0.o. */
134:
135: #define NO_REMAP
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