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1.1 root 1: /* m- file for Elxsi machine (running enix).
2: Copyright (C) 1986 Free Software Foundation, Inc.
3: Adapted by John Salmon
4:
5: This file is part of GNU Emacs.
6:
7: GNU Emacs is free software; you can redistribute it and/or modify
8: it under the terms of the GNU General Public License as published by
9: the Free Software Foundation; either version 1, or (at your option)
10: any later version.
11:
12: GNU Emacs is distributed in the hope that it will be useful,
13: but WITHOUT ANY WARRANTY; without even the implied warranty of
14: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15: GNU General Public License for more details.
16:
17: You should have received a copy of the GNU General Public License
18: along with GNU Emacs; see the file COPYING. If not, write to
19: the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
20:
21:
22: /* The following three symbols give information on
23: the size of various data types. */
24:
25: #define SHORTBITS 16 /* Number of bits in a short */
26:
27: #define INTBITS 32 /* Number of bits in an int */
28:
29: #define LONGBITS 32 /* Number of bits in a long */
30:
31: /* Define BIG_ENDIAN iff lowest-numbered byte in a word
32: is the most significant byte. */
33:
34: /*#define BIG_ENDIAN*/
35:
36: /* Define NO_ARG_ARRAY if you cannot take the address of the first of a
37: * group of arguments and treat it as an array of the arguments. */
38:
39: /*#define NO_ARG_ARRAY */
40:
41: /* Define WORD_MACHINE if addresses and such have
42: * to be corrected before they can be used as byte counts. */
43:
44: #define WORD_MACHINE
45:
46: /* Define how to take a char and sign-extend into an int.
47: On machines where char is signed, this is a no-op. */
48:
49: #define SIGN_EXTEND_CHAR(c) ((int)c)
50:
51: /* Now define a symbol for the cpu type, if your compiler
52: does not define it automatically:
53: vax, m68000, ns16000, pyramid, orion, tahoe and APOLLO
54: are the ones defined so far. */
55:
56: #ifndef elxsi
57: #define elxsi
58: #endif
59:
60: /* Use type int rather than a union, to represent Lisp_Object */
61: /* This is desirable for most machines. */
62:
63: #define NO_UNION_TYPE
64:
65: /* Define EXPLICIT_SIGN_EXTEND if XINT must explicitly sign-extend
66: the 24-bit bit field into an int. In other words, if bit fields
67: are always unsigned.
68:
69: If you use NO_UNION_TYPE, this flag does not matter. */
70:
71: #define EXPLICIT_SIGN_EXTEND
72:
73: /* Data type of load average, as read out of kmem. */
74:
75: /*#define LOAD_AVE_TYPE long */
76:
77: /* Convert that into an integer that is 100 for a load average of 1.0 */
78:
79: /*#define LOAD_AVE_CVT(x) (int) (((double) (x)) * 100.0 / FSCALE) */
80:
81: /* Define CANNOT_DUMP on machines where unexec does not work.
82: Then the function dump-emacs will not be defined
83: and temacs will do (load "loadup") automatically unless told otherwise.
84:
85: The Elxsi can in principle dump, but the necessary changes to
86: unexec, which involve byte-swapping, were too ugly to install.
87: If someone submits simple code that supports dumping on the Elxsi,
88: it can be installed and CANNOT_DUMP can be turned off. */
89:
90: #define CANNOT_DUMP
91:
92: /* Define VIRT_ADDR_VARIES if the virtual addresses of
93: pure and impure space as loaded can vary, and even their
94: relative order cannot be relied on.
95:
96: Otherwise Emacs assumes that text space precedes data space,
97: numerically. */
98:
99: /* #define VIRT_ADDR_VARIES */
100:
101: /* Define C_ALLOCA if this machine does not support a true alloca
102: and the one written in C should be used instead.
103: Define HAVE_ALLOCA to say that the system provides a properly
104: working alloca function and it should be used.
105: Define neither one if an assembler-language alloca
106: in the file alloca.s should be used. */
107:
108: #define C_ALLOCA
109: /*#define HAVE_ALLOCA */
110:
111: /* Define NO_REMAP if memory segmentation makes it not work well
112: to change the boundary between the text section and data section
113: when Emacs is dumped. If you define this, the preloaded Lisp
114: code will not be sharable; but that's better than failing completely. */
115: /*#define NO_REMAP*/
116:
117: /* This is a guess for an alternate solution to whatever
118: problem motivated defining _sobuf in sysdep,c with extern char *_sobuf. */
119: #define _sobuf xsobuf
120:
121: /* Address of start of text segment as loaded. */
122:
123: #define TEXT_START 0x800
124:
125: /* Tell crt0.c not to define environ. */
126:
127: #define DONT_NEED_ENVIRON
128:
129: /* The elxsi has no debugger, so might as well optimize instead
130: of trying to make a symbol table. */
131:
132: #define C_DEBUG_SWITCH -O
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