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b061d5f1 | 1 | /* machine description file For the alpha chip. |
b908093d | 2 | Copyright (C) 1994, 1997, 1999, 2002, 2003, 2004, |
aaef169d | 3 | 2005, 2006 Free Software Foundation, Inc. |
b061d5f1 RS |
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 | |
364c38d3 LK |
19 | the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
20 | Boston, MA 02110-1301, USA. */ | |
b061d5f1 RS |
21 | |
22 | ||
177c0ea7 | 23 | /* The following line tells the configuration script what sort of |
b061d5f1 RS |
24 | operating system this machine is likely to run. |
25 | USUAL-OPSYS="note" | |
26 | ||
27 | NOTE-START | |
28 | Use -opsystem=osf1 | |
29 | NOTE-END | |
30 | ||
31 | */ | |
32 | ||
2eca7f4d | 33 | #ifndef _LP64 |
3347875f DL |
34 | #define _LP64 /* This doesn't appear to be necessary |
35 | on OSF 4/5 -- fx. */ | |
2eca7f4d | 36 | #endif |
b061d5f1 | 37 | |
74d3f806 KH |
38 | /* Define WORDS_BIG_ENDIAN iff lowest-numbered byte in a word |
39 | is the most significant byte. */ | |
40 | ||
41 | #undef WORDS_BIG_ENDIAN | |
42 | ||
b061d5f1 RS |
43 | /* Define NO_ARG_ARRAY if you cannot take the address of the first of a |
44 | * group of arguments and treat it as an array of the arguments. */ | |
45 | ||
46 | #define NO_ARG_ARRAY | |
47 | ||
b061d5f1 RS |
48 | /* Now define a symbol for the cpu type, if your compiler |
49 | does not define it automatically: | |
50 | Ones defined so far include vax, m68000, ns16000, pyramid, | |
51 | orion, tahoe, APOLLO and many others */ | |
52 | ||
53 | /* __alpha defined automatically */ | |
54 | ||
55 | ||
56 | /* Use type EMACS_INT rather than a union, to represent Lisp_Object */ | |
57 | /* This is desirable for most machines. */ | |
b061d5f1 RS |
58 | #define NO_UNION_TYPE |
59 | ||
b061d5f1 RS |
60 | /* Define EXPLICIT_SIGN_EXTEND if XINT must explicitly sign-extend |
61 | the 24-bit bit field into an int. In other words, if bit fields | |
62 | are always unsigned. | |
63 | ||
64 | If you use NO_UNION_TYPE, this flag does not matter. */ | |
65 | ||
66 | #define EXPLICIT_SIGN_EXTEND | |
67 | ||
68 | /* Data type of load average, as read out of kmem. */ | |
69 | ||
70 | #define LOAD_AVE_TYPE long | |
71 | ||
72 | /* Convert that into an integer that is 100 for a load average of 1.0 */ | |
73 | ||
74 | #define LOAD_AVE_CVT(x) (int) (((double) (x)) * 100.0 / FSCALE) | |
75 | ||
b061d5f1 | 76 | /* GNU malloc and the relocating allocator do not work together |
352c01a5 KH |
77 | with X. [Who wrote that?] */ |
78 | ||
79 | /* May 1995: reportedly [Rainer Schoepf <schoepf@uni-mainz.de>] both the | |
80 | system and the gnu malloc system work with "alpha-dec-osf3.0" and | |
81 | "alpha-dec-osf3.2". */ | |
82 | ||
83 | /* May 1995: it seems to me [Morten Welinder <terra@diku.dk>] that both | |
84 | mallocs work with "alpha-dec-osf2.0", but I daren't break anything | |
85 | right now. Feel free to play if you want. */ | |
b061d5f1 | 86 | |
76869384 | 87 | /* #define SYSTEM_MALLOC */ |
b061d5f1 | 88 | |
821f376d RS |
89 | #ifdef __ELF__ |
90 | /* With ELF, make sure that all common symbols get allocated to in the | |
91 | data section. Otherwise, the dump of temacs may miss variables in | |
92 | the shared library that have been initialized. For example, with | |
93 | GNU libc, __malloc_initialized would normally be resolved to the | |
94 | shared library's .bss section, which is fatal. */ | |
95 | # ifdef __GNUC__ | |
96 | # define C_SWITCH_MACHINE -fno-common | |
97 | # else | |
98 | # error What gives? Fix me if DEC Unix supports ELF now. | |
99 | # endif | |
100 | #endif | |
101 | ||
2eca7f4d | 102 | #if defined(__OpenBSD__) |
6c73d346 RS |
103 | #define ORDINARY_LINK |
104 | #endif | |
105 | ||
bcd4fb44 RS |
106 | #ifdef __ELF__ |
107 | #undef UNEXEC | |
1a9bd6bd | 108 | #define UNEXEC unexelf.o |
685f8511 | 109 | #ifndef LINUX |
d5e406c3 | 110 | #define DATA_START 0x140000000 |
bcd4fb44 | 111 | #endif |
685f8511 | 112 | #endif |
bcd4fb44 | 113 | |
821f376d RS |
114 | #ifndef __ELF__ |
115 | ||
b061d5f1 RS |
116 | /* Describe layout of the address space in an executing process. */ |
117 | ||
118 | #define TEXT_START 0x120000000 | |
119 | #define DATA_START 0x140000000 | |
120 | ||
821f376d RS |
121 | /* The program to be used for unexec. */ |
122 | ||
123 | #define UNEXEC unexalpha.o | |
124 | ||
125 | #endif /* notdef __ELF__ */ | |
126 | ||
821f376d | 127 | #if defined (LINUX) && __GNU_LIBRARY__ - 0 < 6 |
629aa3cb RS |
128 | /* This controls a conditional in main. */ |
129 | #define LINUX_SBRK_BUG | |
130 | #endif | |
b061d5f1 | 131 | |
821f376d RS |
132 | /* On the Alpha it's best to avoid including TERMIO since struct |
133 | termio and struct termios are mutually incompatible. */ | |
ee803128 RS |
134 | #define NO_TERMIO |
135 | ||
62d9f4b0 | 136 | #if defined (LINUX) || defined (__NetBSD__) || defined (__OpenBSD__) |
821f376d RS |
137 | # define TEXT_END ({ extern int _etext; &_etext; }) |
138 | # ifndef __ELF__ | |
139 | # define COFF | |
140 | # define DATA_END ({ extern int _EDATA; &_EDATA; }) | |
141 | # endif /* notdef __ELF__ */ | |
ee803128 | 142 | #endif |
62d9f4b0 RS |
143 | |
144 | #if (defined (__NetBSD__) || defined (__OpenBSD__)) && defined (__ELF__) | |
145 | #define HAVE_TEXT_START | |
146 | #endif | |
13d603a9 PE |
147 | |
148 | /* Many Alpha implementations (e.g. gas 2.8) can't handle DBL_MIN: | |
149 | they generate code that uses a signaling NaN instead of DBL_MIN. | |
150 | Define DBL_MIN_REPLACEMENT to be the next value larger than DBL_MIN: | |
151 | this avoids the assembler bug. */ | |
152 | #define DBL_MIN_REPLACEMENT 2.2250738585072019e-308 | |
ab5796a9 MB |
153 | |
154 | /* arch-tag: 978cb578-1e25-4a60-819b-adae0972aa78 | |
155 | (do not change this comment) */ |