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1.1 root 1: /* Machine-dependent configuration for GNU Emacs for AT&T 3b machines.
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: /* The 3b20 doesn't sign extend characters OR ints, so
48: right shifting an int loses the sign bit */
49: #define SIGN_EXTEND_CHAR(c) (((sign_extend_temp=(c)) & 0x80) \
50: ? (sign_extend_temp | 0xFFFFFF00) \
51: : (sign_extend_temp))
52:
53: /* Now define a symbol for the cpu type, if your compiler
54: does not define it automatically */
55: #define ATT3B
56:
57: /* Use type int rather than a union, to represent Lisp_Object */
58: /* This is desirable for most machines. */
59:
60: #define NO_UNION_TYPE
61:
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
64: are always unsigned.
65:
66: If you use NO_UNION_TYPE, this flag does not matter. */
67:
68: #define EXPLICIT_SIGN_EXTEND
69:
70: /* Data type of load average, as read out of kmem. */
71: /* #define LOAD_AVE_TYPE long */
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 / FSCALE) */
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: /* #define CANNOT_DUMP */
81:
82: /* Define VIRT_ADDR_VARIES if the virtual addresses of
83: pure and impure space as loaded can vary, and even their
84: relative order cannot be relied on.
85:
86: Otherwise Emacs assumes that text space precedes data space,
87: numerically. */
88:
89: /* #define VIRT_ADDR_VARIES */ /* Karl Kleinpaste says this isn't needed. */
90:
91: /* Define C_ALLOCA if this machine does not support a true alloca
92: and the one written in C should be used instead.
93: Define HAVE_ALLOCA to say that the system provides a properly
94: working alloca function and it should be used.
95: Define neither one if an assembler-language alloca
96: in the file alloca.s should be used. */
97:
98: /* SysV has alloca in the PW library */
99:
100: #define LIB_STANDARD -lPW -lc
101: #define HAVE_ALLOCA
102:
103: /* Define NO_REMAP if memory segmentation makes it not work well
104: to change the boundary between the text section and data section
105: when Emacs is dumped. If you define this, the preloaded Lisp
106: code will not be sharable; but that's better than failing completely. */
107:
108: #define NO_REMAP
109:
110: /* #define LD_SWITCH_MACHINE -N */
111:
112: /* Use Terminfo, not Termcap. */
113:
114: #define TERMINFO
115:
116: /* -O has been observed to make correct C code in Emacs not work.
117: So don't try to use it. */
118:
119: #if u3b2 || u3b5 || u3b15
120: #define C_OPTIMIZE_SWITCH
121: #endif
122:
123: /* Define our page size. */
124:
125: #define NBPC 2048
126:
127: /* The usual definition of XINT, which involves shifting, does not
128: sign-extend properly on this machine. */
129:
130: #define XINT(i) (((sign_extend_temp=(i)) & 0x00800000) \
131: ? (sign_extend_temp | 0xFF000000) \
132: : (sign_extend_temp & 0x00FFFFFF))
133:
134: #ifdef emacs /* Don't do this when makeing xmakefile! */
135: extern int sign_extend_temp;
136: #endif
137:
138: #if u3b2 || u3b5 || u3b15
139:
140: /* On 3b2/5/15, data space has high order bit on. */
141: #define VALMASK (((1<<VALBITS) - 1) | (1 << 31))
142: #define XTYPE(a) ((enum Lisp_Type) (((a) >> VALBITS) & 0x7F))
143: #define GCTYPEBITS 5
144: #define XADDRFIX(a) ((a) |= 0X80000000) /* Because of high order */
145:
146: #endif /* 3b2, 3b5 or 3b15 */
147:
148: #define TEXT_START 0
149:
150:
151: /* For alloca.c (not actually used, since HAVE_ALLOCA) */
152: #define STACK_DIRECTION 1
153:
154: /* (short) negative-int doesn't sign-extend correctly */
155: #define SHORT_CAST_BUG
156:
157: /* 3B2s with WIN/3B have winsize defined in ptem.h */
158: #if u3b2
159: #define NEED_PTEM_H
160: #endif /* u3b2 */
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