| 1 | /* Machine description file for Acorn RISCiX machines. |
| 2 | Copyright (C) 1994, 2002, 2003, 2004, 2005, |
| 3 | 2006 Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GNU Emacs. |
| 6 | |
| 7 | GNU Emacs 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 2, or (at your option) |
| 10 | any later version. |
| 11 | |
| 12 | GNU Emacs 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. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with GNU Emacs; see the file COPYING. If not, write to |
| 19 | the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| 20 | Boston, 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 |
| 142 | extern 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 |
| 178 | Cannot |
| 179 | do |
| 180 | this |
| 181 | yet |
| 182 | #endif |
| 183 | |
| 184 | /* arch-tag: acee2955-8c49-4b40-813c-579f76f4c0c3 |
| 185 | (do not change this comment) */ |