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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 distributed in the hope that it will be useful,
8: but WITHOUT ANY WARRANTY. No author or distributor
9: accepts responsibility to anyone for the consequences of using it
10: or for whether it serves any particular purpose or works at all,
11: unless he says so in writing. Refer to the GNU Emacs General Public
12: License for full details.
13:
14: Everyone is granted permission to copy, modify and redistribute
15: GNU Emacs, but only under the conditions described in the
16: GNU Emacs General Public License. A copy of this license is
17: supposed to have been given to you along with GNU Emacs so you
18: can know your rights and responsibilities. It should be in a
19: file named COPYING. Among other things, the copyright notice
20: and this notice must be preserved on all copies. */
21:
22:
23: /* The following three symbols give information on
24: the size of various data types. */
25:
26: #define SHORTBITS 16 /* Number of bits in a short */
27:
28: #define INTBITS 32 /* Number of bits in an int */
29:
30: #define LONGBITS 32 /* Number of bits in a long */
31:
32: /* Define BIG_ENDIAN iff lowest-numbered byte in a word
33: is the most significant byte. */
34:
35: /*#define BIG_ENDIAN*/
36:
37: /* Define NO_ARG_ARRAY if you cannot take the address of the first of a
38: * group of arguments and treat it as an array of the arguments. */
39:
40: /*#define NO_ARG_ARRAY */
41:
42: /* Define WORD_MACHINE if addresses and such have
43: * to be corrected before they can be used as byte counts. */
44:
45: #define WORD_MACHINE
46:
47: /* Define how to take a char and sign-extend into an int.
48: On machines where char is signed, this is a no-op. */
49:
50: #define SIGN_EXTEND_CHAR(c) ((int)c)
51:
52: /* Now define a symbol for the cpu type, if your compiler
53: does not define it automatically:
54: vax, m68000, ns16000, pyramid, orion, tahoe and APOLLO
55: are the ones defined so far. */
56:
57: #ifndef elxsi
58: #define elxsi
59: #endif
60:
61: /* Use type int rather than a union, to represent Lisp_Object */
62: /* This is desirable for most machines. */
63:
64: #define NO_UNION_TYPE
65:
66: /* Define EXPLICIT_SIGN_EXTEND if XINT must explicitly sign-extend
67: the 24-bit bit field into an int. In other words, if bit fields
68: are always unsigned.
69:
70: If you use NO_UNION_TYPE, this flag does not matter. */
71:
72: #define EXPLICIT_SIGN_EXTEND
73:
74: /* Data type of load average, as read out of kmem. */
75:
76: /*#define LOAD_AVE_TYPE long */
77:
78: /* Convert that into an integer that is 100 for a load average of 1.0 */
79:
80: /*#define LOAD_AVE_CVT(x) (int) (((double) (x)) * 100.0 / FSCALE) */
81:
82: /* Define CANNOT_DUMP on machines where unexec does not work.
83: Then the function dump-emacs will not be defined
84: and temacs will do (load "loadup") automatically unless told otherwise.
85:
86: The Elxsi can in principle dump, but the necessary changes to
87: unexec, which involve byte-swapping, were too ugly to install.
88: If someone submits simple code that supports dumping on the Elxsi,
89: it can be installed and CANNOT_DUMP can be turned off. */
90:
91: #define CANNOT_DUMP
92:
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.
96:
97: Otherwise Emacs assumes that text space precedes data space,
98: numerically. */
99:
100: /* #define VIRT_ADDR_VARIES */
101:
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. */
108:
109: #define C_ALLOCA
110: /*#define HAVE_ALLOCA */
111:
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. */
116: /*#define NO_REMAP*/
117:
118: /* This is a guess for an alternate solution to whatever
119: problem motivated defining _sobuf in sysdep,c with extern char *_sobuf. */
120: #define _sobuf xsobuf
121:
122: /* Address of start of text segment as loaded. */
123:
124: #define TEXT_START 0x800
125:
126: /* Tell crt0.c not to define environ. */
127:
128: #define DONT_NEED_ENVIRON
129:
130: /* The elxsi has no debugger, so might as well optimize instead
131: of trying to make a symbol table. */
132:
133: #define C_DEBUG_SWITCH -O
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