1 /* machine description file For the alpha chip.
2 Copyright (C) 1994, 1997, 1999, 2002 Free Software Foundation, Inc.
4 This file is part of GNU Emacs.
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)
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.
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, Inc., 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
22 /* The following line tells the configuration script what sort of
23 operating system this machine is likely to run.
33 #define _LP64 /* This doesn't appear to be necessary
37 /* Define WORDS_BIG_ENDIAN iff lowest-numbered byte in a word
38 is the most significant byte. */
40 #undef WORDS_BIG_ENDIAN
42 /* Define NO_ARG_ARRAY if you cannot take the address of the first of a
43 * group of arguments and treat it as an array of the arguments. */
47 /* Now define a symbol for the cpu type, if your compiler
48 does not define it automatically:
49 Ones defined so far include vax, m68000, ns16000, pyramid,
50 orion, tahoe, APOLLO and many others */
52 /* __alpha defined automatically */
55 /* Use type EMACS_INT rather than a union, to represent Lisp_Object */
56 /* This is desirable for most machines. */
59 /* Define EXPLICIT_SIGN_EXTEND if XINT must explicitly sign-extend
60 the 24-bit bit field into an int. In other words, if bit fields
63 If you use NO_UNION_TYPE, this flag does not matter. */
65 #define EXPLICIT_SIGN_EXTEND
67 /* Data type of load average, as read out of kmem. */
69 #define LOAD_AVE_TYPE long
71 /* Convert that into an integer that is 100 for a load average of 1.0 */
73 #define LOAD_AVE_CVT(x) (int) (((double) (x)) * 100.0 / FSCALE)
75 /* GNU malloc and the relocating allocator do not work together
76 with X. [Who wrote that?] */
78 /* May 1995: reportedly [Rainer Schoepf <schoepf@uni-mainz.de>] both the
79 system and the gnu malloc system work with "alpha-dec-osf3.0" and
80 "alpha-dec-osf3.2". */
82 /* May 1995: it seems to me [Morten Welinder <terra@diku.dk>] that both
83 mallocs work with "alpha-dec-osf2.0", but I daren't break anything
84 right now. Feel free to play if you want. */
86 /* #define SYSTEM_MALLOC */
89 /* With ELF, make sure that all common symbols get allocated to in the
90 data section. Otherwise, the dump of temacs may miss variables in
91 the shared library that have been initialized. For example, with
92 GNU libc, __malloc_initialized would normally be resolved to the
93 shared library's .bss section, which is fatal. */
95 # define C_SWITCH_MACHINE -fno-common
97 # error What gives? Fix me if DEC Unix supports ELF now.
101 #if defined(__OpenBSD__)
102 #define ORDINARY_LINK
107 #define UNEXEC unexelf.o
109 #define DATA_START 0x140000000
115 /* Describe layout of the address space in an executing process. */
117 #define TEXT_START 0x120000000
118 #define DATA_START 0x140000000
120 /* The program to be used for unexec. */
122 #define UNEXEC unexalpha.o
124 #endif /* notdef __ELF__ */
126 #if defined (LINUX) && __GNU_LIBRARY__ - 0 < 6
127 /* This controls a conditional in main. */
128 #define LINUX_SBRK_BUG
131 /* On the Alpha it's best to avoid including TERMIO since struct
132 termio and struct termios are mutually incompatible. */
135 #if defined (LINUX) || defined (__NetBSD__) || defined (__OpenBSD__)
136 # define TEXT_END ({ extern int _etext; &_etext; })
139 # define DATA_END ({ extern int _EDATA; &_EDATA; })
140 # endif /* notdef __ELF__ */
143 #if (defined (__NetBSD__) || defined (__OpenBSD__)) && defined (__ELF__)
144 #define HAVE_TEXT_START
147 /* Many Alpha implementations (e.g. gas 2.8) can't handle DBL_MIN:
148 they generate code that uses a signaling NaN instead of DBL_MIN.
149 Define DBL_MIN_REPLACEMENT to be the next value larger than DBL_MIN:
150 this avoids the assembler bug. */
151 #define DBL_MIN_REPLACEMENT 2.2250738585072019e-308
153 /* arch-tag: 978cb578-1e25-4a60-819b-adae0972aa78
154 (do not change this comment) */