src/m/acorn.h

   1 /* Machine description file for Acorn RISCiX machines.
   2    Copyright (C) 1994 Free Software Foundation, Inc.
   3
   4 This file is part of GNU Emacs.
   5
   6 GNU Emacs is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU Emacs is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Emacs; see the file COPYING.  If not, write to
  18 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19 Boston, MA 02111-1307, USA.  */
  20
  21
  22
  23 /* Define WORDS_BIG_ENDIAN iff lowest-numbered byte in a word
  24    is the most significant byte.  */
  25
  26 #undef WORDS_BIG_ENDIAN
  27
  28 /* Define NO_ARG_ARRAY if you cannot take the address of the first of a
  29  * group of arguments and treat it as an array of the arguments.  We can't
  30  * do this on the arm with gcc, since the first 4 args are in registers.  */
  31
  32 #ifdef __GNUC__
  33 #define NO_ARG_ARRAY
  34 #else
  35 #undef NO_ARG_ARRAY
  36 #endif
  37
  38 /* Define WORD_MACHINE if addresses and such have
  39  * to be corrected before they can be used as byte counts.  */
  40
  41 #undef WORD_MACHINE
  42
  43 /* Define how to take a char and sign-extend into an int.
  44    On machines where char is signed, this is a no-op.  */
  45
  46 /* ARM note - The RISCiX Norcroft C Compiler has ALL
  47    non-32-bit types as unsigned */
  48
  49 #define SIGN_EXTEND_CHAR(c) (((int)(c) << 24) >> 24)
  50
  51 /* Now define a symbol for the cpu type, if your compiler
  52    does not define it automatically:
  53    Ones defined so far include vax, m68000, ns16000, pyramid,
  54    orion, tahoe, APOLLO and many others */
  55
  56 /* ARM note - this is done by the Norcroft compiler - symbol is `__arm' */
  57
  58 /* Use type int rather than a union, to represent Lisp_Object */
  59 /* This is desirable for most machines.  */
  60
  61 #define NO_UNION_TYPE
  62
  63 /* Define EXPLICIT_SIGN_EXTEND if XINT must explicitly sign-extend
  64    the 24-bit bit field into an int.  In other words, if bit fields
  65    are always unsigned.
  66
  67    If you use NO_UNION_TYPE, this flag does not matter.  */
  68
  69 #define EXPLICIT_SIGN_EXTEND
  70
  71 #ifdef LDAV_SYMBOL
  72 #undef LDAV_SYMBOL
  73 #endif
  74
  75 #define LDAV_SYMBOL "_iavenrun"
  76
  77
  78 /* Data type of load average, as read out of kmem.  */
  79
  80 #define LOAD_AVE_TYPE long
  81
  82 /* Convert that into an integer that is 100 for a load average of 1.0  */
  83
  84 /*
  85  * Scale factor for scaled integers used to count
  86  * %cpu time and load averages.
  87  */
  88
  89 /* FSHIFT and FSCALE are defined in param.h, but are required by
  90    LOAD_AVE_CVT, so they need to be defined here.  */
  91
  92 #ifndef FSHIFT
  93 #define FSHIFT  8       /* bits to right of fixed binary point */
  94 #endif
  95
  96 #ifndef FSCALE
  97 #define FSCALE  (1<<FSHIFT)
  98 #endif
  99
 100 #define LOAD_AVE_CVT(x) (int) (((double) (x)) * 100.0 / FSCALE)
 101
 102 /* Define CANNOT_DUMP on machines where unexec does not work.
 103    Then the function dump-emacs will not be defined
 104    and temacs will do (load "loadup") automatically unless told otherwise.  */
 105
 106 #undef CANNOT_DUMP
 107
 108 /* Define VIRT_ADDR_VARIES if the virtual addresses of
 109    pure and impure space as loaded can vary, and even their
 110    relative order cannot be relied on.
 111
 112    Otherwise Emacs assumes that text space precedes data space,
 113    numerically.  */
 114
 115 #undef VIRT_ADDR_VARIES
 116
 117 /* This prevents Emacs dumping an unsqueezed binary with the
 118    SQUEEZE bit set in the magic number. */
 119
 120 #define ADJUST_EXEC_HEADER {hdr.a_magic &= ~MF_SQUEEZED;}
 121
 122 /* Define C_ALLOCA if this machine does not support a true alloca
 123    and the one written in C should be used instead.
 124    Define HAVE_ALLOCA to say that the system provides a properly
 125    working alloca function and it should be used.
 126    Define neither one if an assembler-language alloca
 127    in the file alloca.s should be used.  */
 128
 129 #ifdef __GNUC__
 130
 131 /* Use builtin alloca. Also be sure that no other ones are tried out. */
 132 #define alloca __builtin_alloca
 133 #define HAVE_ALLOCA
 134
 135 /* Keep gcc/RISCiX happy - it uses __gccmain where other versions of
 136    gcc use __main, because of a library routine name clash. */
 137 #define __main __gccmain
 138
 139 #else
 140 #define C_ALLOCA
 141 #undef HAVE_ALLOCA
 142 #endif  /* __GNUC__ */
 143
 144 /* Define NO_REMAP if memory segmentation makes it not work well
 145    to change the boundary between the text section and data section
 146    when Emacs is dumped.  If you define this, the preloaded Lisp
 147    code will not be sharable; but that's better than failing completely.  */
 148
 149 #define NO_REMAP
 150
 151
 152 #ifndef NOT_C_CODE
 153 #define TEXT_START      0x8000
 154 #define DATA_END        &_edata
 155 extern int _edata;
 156 #define etext _etext
 157 #endif
 158
 159 /* Avoid debugging library */
 160 #define LIBS_DEBUG
 161
 162 /* Avoid sharing libc */
 163 #define LIB_STANDARD -lc_n
 164
 165 /* Avoid sharing libX11 */
 166 #define LIB_X11_LIB -lX11_n
 167
 168 /* All kinds of symbol definitions, so as to avoid multiply defined symbol
 169    errors from the RISCiX linker. */
 170
 171 #ifdef __GNUC__
 172 #define C_DEBUG_SWITCH
 173
 174 #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=
 175
 176 #else
 177 #define C_DEBUG_SWITCH -O -w -g -Dgetopt=gnu_getopt -Dopterr=gnu_opterr -Doptind=gnu_optind -Doptarg=gnu_optarg -Dcfree=gnu_cfree
 178 #endif
 179
 180 /* Turn this on to avoid the emacs malloc and use standard one */
 181
 182 #undef SYSTEM_MALLOC
 183
 184 /* Use <dirent.h>. */
 185 #define SYSV_SYSTEM_DIR
 186
 187 /* For the portable alloca */
 188 #define STACK_DIRECTION -1
 189
 190 #ifdef NO_REMAP
 191 /* CRT0_O is defined in s/riscix1-1.h or s/riscix1-2.h, as appropriate. */
 192 #define START_FILES pre-crt0.o CRT0_O
 193 #else
 194 Cannot
 195 do
 196 this
 197 yet
 198 #endif