1/* machine description file For the alpha chip. 2 Copyright (C) 1994, 1997, 1999, 2001, 2002, 2003, 2004, 3 2005, 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 28Use -opsystem=osf1 29NOTE-END 30 31*/ 32 33#ifndef _LP64 34#define _LP64 /* This doesn't appear to be necessary 35 on OSF 4/5 -- fx. */ 36#endif 37 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 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 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. */ 58#define NO_UNION_TYPE 59 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 76/* GNU malloc and the relocating allocator do not work together 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. */ 86 87/* #define SYSTEM_MALLOC */ 88 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 101 102#if defined(__OpenBSD__) 103#define ORDINARY_LINK 104#endif 105 106#ifdef __ELF__ 107#undef UNEXEC 108#define UNEXEC unexelf.o 109#ifndef LINUX 110#define DATA_START 0x140000000 111#endif 112#endif 113 114#ifndef __ELF__ 115 116/* Describe layout of the address space in an executing process. */ 117 118#define TEXT_START 0x120000000 119#define DATA_START 0x140000000 120 121/* The program to be used for unexec. */ 122 123#define UNEXEC unexalpha.o 124 125#endif /* notdef __ELF__ */ 126 127#if defined (LINUX) && __GNU_LIBRARY__ - 0 < 6 128/* This controls a conditional in main. */ 129#define LINUX_SBRK_BUG 130#endif 131 132/* On the Alpha it's best to avoid including TERMIO since struct 133 termio and struct termios are mutually incompatible. */ 134#define NO_TERMIO 135 136#if defined (LINUX) || defined (__NetBSD__) || defined (__OpenBSD__) 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__ */ 142#endif 143 144#if (defined (__NetBSD__) || defined (__OpenBSD__)) && defined (__ELF__) 145#define HAVE_TEXT_START 146#endif 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-308 153 154/* arch-tag: 978cb578-1e25-4a60-819b-adae0972aa78 155 (do not change this comment) */ 156