1 /* machine description file for Elxsi machine (running enix).
2 Copyright (C) 1986, 1992 Free Software Foundation, Inc.
5 This file is part of SXEmacs
7 SXEmacs 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 3 of the License, or
10 (at your option) any later version.
12 SXEmacs 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.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
21 /* Synched up with: FSF 19.31. */
23 /* The following line tells the configuration script what sort of
24 operating system this machine is likely to run.
25 USUAL-OPSYS="usg5-2" */
27 /* This file was modified by Matt Crawford <matt@tank.uchicago.edu>
28 to work under Elxsi's 12.0 release of BSD unix. */
30 /* Now define a symbol for the cpu type, if your compiler
31 does not define it automatically:
32 vax, m68000, ns16000, pyramid, orion, tahoe and APOLLO
33 are the ones defined so far. */
39 /* Name of kernel load average variable */
42 #define LDAV_SYMBOL "avenrun"
44 /* Data type of load average, as read out of kmem. */
46 #define LOAD_AVE_TYPE double
48 /* Convert that into an integer that is 100 for a load average of 1.0 */
50 #define LOAD_AVE_CVT(x) (int) ((x) * 100.0)
52 /* Define CANNOT_DUMP on machines where unexec does not work.
53 Then the function dump-emacs will not be defined
54 and temacs will do (load "loadup") automatically unless told otherwise.
56 Earlier versions couldn't dump.
57 Changes for 12.0 release are in 19.1.
58 Dumping should work now. */
60 /* #define CANNOT_DUMP */
62 /* Define C_ALLOCA if this machine does not support a true alloca
63 and the one written in C should be used instead.
64 Define HAVE_ALLOCA to say that the system provides a properly
65 working alloca function and it should be used.
66 Define neither one if an assembler-language alloca
67 in the file alloca.s should be used. */
70 /*#define HAVE_ALLOCA */
72 /* Define NO_REMAP if memory segmentation makes it not work well
73 to change the boundary between the text section and data section
74 when Emacs is dumped. If you define this, the preloaded Lisp
75 code will not be sharable; but that's better than failing completely. */
78 /* This is a guess for an alternate solution to whatever
79 problem motivated defining _sobuf in sysdep,c with extern char *_sobuf. */
82 /* Address of start of text segment as loaded. */
84 #define TEXT_START 0x800
86 /* Tell crt0.c not to define environ. */
88 #define DONT_NEED_ENVIRON
90 /* The elxsi has no debugger, so might as well optimize instead
91 of trying to make a symbol table. */
93 #define C_DEBUG_SWITCH "-O"
95 /* Elxsi uses COFF under both Sys V and BSD environments */
99 #define ADJUST_EXEC_HEADER {\
100 extern int _init_brk;\
101 _init_brk = bss_start;\