1/* Machine description file for Acorn RISCiX machines. 2 Copyright (C) 1994, 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 24/* Define WORDS_BIG_ENDIAN iff lowest-numbered byte in a word 25 is the most significant byte. */ 26 27#undef WORDS_BIG_ENDIAN 28 29/* Define NO_ARG_ARRAY if you cannot take the address of the first of a 30 * group of arguments and treat it as an array of the arguments. We can't 31 * do this on the arm with gcc, since the first 4 args are in registers. */ 32 33#ifdef __GNUC__ 34#define NO_ARG_ARRAY 35#else 36#undef NO_ARG_ARRAY 37#endif 38 39/* Define WORD_MACHINE if addresses and such have 40 * to be corrected before they can be used as byte counts. */ 41 42#undef WORD_MACHINE 43 44/* Define how to take a char and sign-extend into an int. 45 On machines where char is signed, this is a no-op. */ 46 47/* ARM note - The RISCiX Norcroft C Compiler has ALL 48 non-32-bit types as unsigned */ 49 50#define SIGN_EXTEND_CHAR(c) (((int)(c) << 24) >> 24) 51 52/* Now define a symbol for the cpu type, if your compiler 53 does not define it automatically: 54 Ones defined so far include vax, m68000, ns16000, pyramid, 55 orion, tahoe, APOLLO and many others */ 56 57/* ARM note - this is done by the Norcroft compiler - symbol is `__arm' */ 58 59/* Use type int rather than a union, to represent Lisp_Object */ 60/* This is desirable for most machines. */ 61 62#define NO_UNION_TYPE 63 64/* Define EXPLICIT_SIGN_EXTEND if XINT must explicitly sign-extend 65 the 24-bit bit field into an int. In other words, if bit fields 66 are always unsigned. 67 68 If you use NO_UNION_TYPE, this flag does not matter. */ 69 70#define EXPLICIT_SIGN_EXTEND 71 72#ifdef LDAV_SYMBOL 73#undef LDAV_SYMBOL 74#endif 75 76#define LDAV_SYMBOL "_iavenrun" 77 78 79/* Data type of load average, as read out of kmem. */ 80 81#define LOAD_AVE_TYPE long 82 83/* Convert that into an integer that is 100 for a load average of 1.0 */ 84 85/* 86 * Scale factor for scaled integers used to count 87 * %cpu time and load averages. 88 */ 89 90/* FSHIFT and FSCALE are defined in param.h, but are required by 91 LOAD_AVE_CVT, so they need to be defined here. */ 92 93#ifndef FSHIFT 94#define FSHIFT 8 /* bits to right of fixed binary point */ 95#endif 96 97#ifndef FSCALE 98#define FSCALE (1<<FSHIFT) 99#endif 100 101#define LOAD_AVE_CVT(x) (int) (((double) (x)) * 100.0 / FSCALE) 102 103/* Define CANNOT_DUMP on machines where unexec does not work. 104 Then the function dump-emacs will not be defined 105 and temacs will do (load "loadup") automatically unless told otherwise. */ 106 107#undef CANNOT_DUMP 108 109/* Define VIRT_ADDR_VARIES if the virtual addresses of 110 pure and impure space as loaded can vary, and even their 111 relative order cannot be relied on. 112 113 Otherwise Emacs assumes that text space precedes data space, 114 numerically. */ 115 116#undef VIRT_ADDR_VARIES 117 118/* This prevents Emacs dumping an unsqueezed binary with the 119 SQUEEZE bit set in the magic number. */ 120 121#define ADJUST_EXEC_HEADER {hdr.a_magic &= ~MF_SQUEEZED;} 122 123#ifdef __GNUC__ 124 125/* Keep gcc/RISCiX happy - it uses __gccmain where other versions of 126 gcc use __main, because of a library routine name clash. */ 127#define __main __gccmain 128 129#endif /* __GNUC__ */ 130 131/* Define NO_REMAP if memory segmentation makes it not work well 132 to change the boundary between the text section and data section 133 when Emacs is dumped. If you define this, the preloaded Lisp 134 code will not be sharable; but that's better than failing completely. */ 135 136#define NO_REMAP 137 138 139#ifndef NOT_C_CODE 140#define TEXT_START 0x8000 141#define DATA_END &_edata 142extern int _edata; 143#define etext _etext 144#endif 145 146/* Avoid debugging library */ 147#define LIBS_DEBUG 148 149/* Avoid sharing libc */ 150#define LIB_STANDARD -lc_n 151 152/* Avoid sharing libX11 */ 153#define LIB_X11_LIB -lX11_n 154 155/* All kinds of symbol definitions, so as to avoid multiply defined symbol 156 errors from the RISCiX linker. */ 157 158#ifdef __GNUC__ 159#define C_DEBUG_SWITCH 160 161#define C_OPTIMIZE_SWITCH -O1 -fomit-frame-pointer -w -g -Dgetopt=gnu_getopt -Dopterr=gnu_opterr -Doptind=gnu_optind -Doptarg=gnu_optarg -Dcfree=gnu_cfree -D___type= 162 163#else 164#define C_DEBUG_SWITCH -O -w -g -Dgetopt=gnu_getopt -Dopterr=gnu_opterr -Doptind=gnu_optind -Doptarg=gnu_optarg -Dcfree=gnu_cfree 165#endif 166 167/* Turn this on to avoid the emacs malloc and use standard one */ 168 169#undef SYSTEM_MALLOC 170 171/* Use <dirent.h>. */ 172#define SYSV_SYSTEM_DIR 173 174#ifdef NO_REMAP 175/* CRT0_O is defined in s/riscix1-1.h or s/riscix1-2.h, as appropriate. */ 176#define START_FILES pre-crt0.o CRT0_O 177#else 178Cannot 179do 180this 181yet 182#endif 183 184/* arch-tag: acee2955-8c49-4b40-813c-579f76f4c0c3 185 (do not change this comment) */ 186