1/* Machine description file for intel 386. 2 Copyright (C) 1987, 2001, 2002, 2003, 2004, 2005, 3 2006, 2007 Free Software Foundation, Inc. 4 5This file is part of GNU Emacs. 6 7GNU Emacs is free software; you can redistribute it and/or modify 8it under the terms of the GNU General Public License as published by 9the Free Software Foundation; either version 2, or (at your option) 10any later version. 11 12GNU Emacs is distributed in the hope that it will be useful, 13but WITHOUT ANY WARRANTY; without even the implied warranty of 14MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15GNU General Public License for more details. 16 17You should have received a copy of the GNU General Public License 18along with GNU Emacs; see the file COPYING. If not, write to 19the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 20Boston, MA 02110-1301, USA. */ 21 22 23/* The following line tells the configuration script what sort of 24 operating system this machine is likely to run. 25 USUAL-OPSYS="note" 26 27NOTE-START 28Intel 386 (-machine=intel386 or -machine=is386.h) 29 30 The possibilities for -opsystem are: bsd4-2, usg5-2-2, usg5-3, 31 isc2-2, 386-ix, esix, linux, sco3.2v4, and xenix. 32 33 18.58 should support a wide variety of operating systems. 34 Use isc2-2 for Interactive 386/ix version 2.2. 35 Use 386ix for prior versions. 36 Use esix for Esix. 37 Use linux for Linux. 38 It isn't clear what to do on an SCO system. 39 40 -machine=is386 is used for an Integrated Solutions 386 machine. 41 It may also be correct for Microport systems. 42 43Cubix QBx/386 (-machine=intel386 -opsystem=usg5-3) 44 45 Changes merged in 19.1. Systems before 2/A/0 may fail to compile etags.c 46 due to a compiler bug. 47 48Prime EXL (-machine=intel386 -opsystem=usg5-3) 49 50 Minor changes merged in 19.1. 51NOTE-END */ 52 53/* Define WORDS_BIG_ENDIAN iff lowest-numbered byte in a word 54 is the most significant byte. */ 55 56#undef WORDS_BIG_ENDIAN 57 58/* Define NO_ARG_ARRAY if you cannot take the address of the first of a 59 * group of arguments and treat it as an array of the arguments. */ 60 61/* #define NO_ARG_ARRAY */ 62 63/* Define WORD_MACHINE if addresses and such have 64 * to be corrected before they can be used as byte counts. */ 65 66/* #define WORD_MACHINE */ 67 68/* Now define a symbol for the cpu type, if your compiler 69 does not define it automatically: 70 Ones defined so far include vax, m68000, ns16000, pyramid, 71 orion, tahoe, APOLLO and many others */ 72 73#define INTEL386 74 75/* Use type int rather than a union, to represent Lisp_Object */ 76 77#define NO_UNION_TYPE 78 79/* crt0.c, if it is used, should use the i386-bsd style of entry. 80 with no extra dummy args. On USG and XENIX, 81 NO_REMAP says this isn't used. */ 82 83#define CRT0_DUMMIES bogus_fp, 84 85/* crt0.c should define a symbol `start' and do .globl with a dot. */ 86 87#define DOT_GLOBAL_START 88 89#ifdef XENIX 90/* Data type of load average, as read out of kmem. */ 91#define LOAD_AVE_TYPE short 92 93/* Convert that into an integer that is 100 for a load average of 1.0 */ 94#define LOAD_AVE_CVT(x) (((double) (x)) * 100.0 / FSCALE) 95 96#define FSCALE 256.0 /* determined by experimentation... */ 97#endif 98 99 100#ifdef SOLARIS2 101/* Data type of load average, as read out of kmem. */ 102#define LOAD_AVE_TYPE long 103 104/* Convert that into an integer that is 100 for a load average of 1.0 */ 105/* This is totally uncalibrated. */ 106#define LOAD_AVE_CVT(x) ((int) (((double) (x)) * 100.0 / FSCALE)) 107 108/* J.W.Hawtin@lut.ac.uk say Solaris 2.4 as well as Solaris 2.1 on X86 109 requires -lkvm as well. 110 And handa@etl.gov.jp says that -lkvm needs -llelf, at least on 2.5. */ 111#define LIBS_MACHINE -lkvm -lelf 112 113#ifndef SOLARIS2_4 114/* J.W.hawtin@lut.ac.uk says Solaris 2.1 on the X86 has FSCALE defined in a 115 system header. */ 116#else /* SOLARIS2_4 */ 117#ifndef __GNUC__ 118#if 0 /* wisner@gryphon.com says this screws up cpp */ 119#define C_SWITCH_MACHINE -Xa 120#endif 121#endif /* not __GNUC__ */ 122#endif /* SOLARIS2_4 */ 123 124/* configure thinks solaris X86 has gethostname, but it does not work, 125 so undefine it. */ 126#undef HAVE_GETHOSTNAME 127 128#else /* not SOLARIS2 */ 129#ifdef USG5_4 /* Older USG systems do not support the load average. */ 130/* Data type of load average, as read out of kmem. */ 131 132#define LOAD_AVE_TYPE long 133 134/* Convert that into an integer that is 100 for a load average of 1.0 */ 135/* This is totally uncalibrated. */ 136 137#define LOAD_AVE_CVT(x) ((int) (((double) (x)) * 100.0 / FSCALE)) 138#define FSCALE 256.0 139#endif 140#endif /* not SOLARIS2 */ 141 142/* Define CANNOT_DUMP on machines where unexec does not work. 143 Then the function dump-emacs will not be defined 144 and temacs will do (load "loadup") automatically unless told otherwise. */ 145 146/* #define CANNOT_DUMP */ 147 148/* Define VIRT_ADDR_VARIES if the virtual addresses of 149 pure and impure space as loaded can vary, and even their 150 relative order cannot be relied on. 151 152 Otherwise Emacs assumes that text space precedes data space, 153 numerically. */ 154 155/* #define VIRT_ADDR_VARIES */ 156 157#ifdef XENIX 158/* Define NO_REMAP if memory segmentation makes it not work well 159 to change the boundary between the text section and data section 160 when Emacs is dumped. If you define this, the preloaded Lisp 161 code will not be sharable; but that's better than failing completely. */ 162 163#define NO_REMAP 164 165/* Since cannot purify, use standard Xenix 386 startup code. */ 166 167#define START_FILES /lib/386/Sseg.o pre-crt0.o /lib/386/Scrt0.o 168 169/* These really use terminfo. */ 170 171#define LIBS_TERMCAP /lib/386/Slibcurses.a \ 172 /lib/386/Slibtinfo.a /lib/386/Slibx.a 173 174/* Standard libraries for this machine. Since `-l' doesn't work in `ld'. */ 175/* '__fltused' is unresolved w/o Slibcfp.a */ 176#define LIB_STANDARD /lib/386/Slibcfp.a /lib/386/Slibc.a 177#else /* not XENIX */ 178 179/* this brings in alloca() if we're using cc */ 180#ifdef USG 181#ifndef LIB_STANDARD 182#ifdef USG5_4 183#define LIB_STANDARD -lc 184#else /* not USG5_4 */ 185#define LIB_STANDARD -lPW -lc 186#endif /* not USG5_4 */ 187#endif /* LIB_STANDARD */ 188 189#define NO_REMAP 190#define TEXT_START 0 191#endif /* USG */ 192#endif /* not XENIX */ 193 194#ifdef USG5_4 195#define DATA_SEG_BITS 0x08000000 196#endif 197 198#ifdef MSDOS 199#define NO_REMAP 200#endif 201 202#ifdef WINDOWSNT 203#define VIRT_ADDR_VARIES 204#define DATA_END get_data_end () 205#define DATA_START get_data_start () 206#define NO_ARG_ARRAY 207#endif 208 209#ifdef linux 210/* libc-linux/sysdeps/linux/i386/ulimit.c says that due to shared library, */ 211/* we cannot get the maximum address for brk */ 212#define ULIMIT_BREAK_VALUE (32*1024*1024) 213 214#define SEGMENT_MASK ((SEGMENT_SIZE)-1) 215#endif 216 217/* arch-tag: 746338f0-cb7b-4f49-a98c-cb50817cf2ec 218 (do not change this comment) */ 219