src/m/acorn.h

   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
   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 3, 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) */