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1.1 root 1: /* m- file for Data General AViiON.
2: Copyright (C) 1985, 1986, 1991 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) (c)
49:
50: /* Define DATA_SEG_BITS if pointers need to be corrected with
51: a segment field. */
52:
53: #ifdef FIX_ADDRESS
54: #define DATA_SEG_BITS 0xef000000
55: #endif
56:
57: /* Now define a symbol for the cpu type, if your compiler
58: does not define it automatically:
59: Ones defined so far include vax, m68000, ns16000, pyramid,
60: orion, tahoe, APOLLO and many others */
61:
62: #ifndef m88k
63: #define m88k
64: #endif
65:
66: /* Use type int rather than a union, to represent Lisp_Object */
67: /* This is desirable for most machines. */
68:
69: #define NO_UNION_TYPE
70:
71: /* Define EXPLICIT_SIGN_EXTEND if XINT must explicitly sign-extend
72: the 24-bit bit field into an int. In other words, if bit fields
73: are always unsigned.
74:
75: If you use NO_UNION_TYPE, this flag does not matter. */
76:
77: #define EXPLICIT_SIGN_EXTEND
78:
79: /* Data type of load average, as read out of kmem. */
80:
81: /* #define LOAD_AVE_TYPE long */
82:
83: /* Convert that into an integer that is 100 for a load average of 1.0 */
84:
85: /* #define LOAD_AVE_CVT(x) (int) (((double) (x)) * 100.0 / FSCALE) */
86:
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. */
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: #define alloca(x) __builtin_alloca(x)
112:
113: /* Define NO_REMAP if memory segmentation makes it not work well
114: to change the boundary between the text section and data section
115: when Emacs is dumped. If you define this, the preloaded Lisp
116: code will not be sharable; but that's better than failing completely. */
117:
118: #define NO_REMAP
119:
120: /* Use 26 bits instead of 24 for internal pointer values */
121:
122: #define VALBITS 26
123: #define GCTYPEBITS 5
124:
125: /* Define ADDR_CORRECT(ADDR) to be a macro to correct an int which is
126: the bit pattern of a pointer to a byte into an int which is the
127: number of a byte.
128:
129: This macro has a default definition which is usually right.
130: This default definition is a no-op on most machines (where a
131: pointer looks like an int) but not on all machines. */
132:
133: #define ADDR_CORRECT(ADDR) ((int)ADDR)
134:
135: /* Cast pointers to this type to compare them. */
136:
137: #define PNTR_COMPARISON_TYPE void *
138:
139: /* Some machines that use COFF executables require that each section
140: start on a certain boundary *in the COFF file*. Such machines should
141: define SECTION_ALIGNMENT to a mask of the low-order bits that must be
142: zero on such a boundary. This mask is used to control padding between
143: segments in the COFF file.
144:
145: If SECTION_ALIGNMENT is not defined, the segments are written
146: consecutively with no attempt at alignment. This is right for
147: unmodified system V. */
148:
149: #define SECTION_ALIGNMENT 0x7
150:
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