src/m/mips.h

   1 /* machine description file for Mips machines.
   2    Copyright (C) 1987, 1990 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 1, 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, 675 Mass Ave, Cambridge, MA 02139, USA.  */
  19
  20
  21 /* The following line tells the configuration script what sort of
  22    operating system this machine is likely to run.
  23    USUAL-OPSYS="note"
  24
  25 NOTE-START
  26 Use -opsystem=usg5-2-2 normally, or -opsystem=bsd4-3 with the BSD
  27 world.
  28 NOTE-END  */
  29
  30 /* The following three symbols give information on
  31  the size of various data types.  */
  32
  33 #define SHORTBITS 16            /* Number of bits in a short */
  34
  35 #define INTBITS 32              /* Number of bits in an int */
  36
  37 #define LONGBITS 32             /* Number of bits in a long */
  38
  39 /* Define BIG_ENDIAN iff lowest-numbered byte in a word
  40    is the most significant byte.  */
  41
  42 #define BIG_ENDIAN
  43
  44 /* Define NO_ARG_ARRAY if you cannot take the address of the first of a
  45  * group of arguments and treat it as an array of the arguments.  */
  46
  47 #define NO_ARG_ARRAY
  48
  49 /* Define WORD_MACHINE if addresses and such have
  50  * to be corrected before they can be used as byte counts.  */
  51
  52 #undef WORD_MACHINE
  53
  54 /* Now define a symbol for the cpu type, if your compiler
  55    does not define it automatically:
  56    Ones defined so far include vax, m68000, ns16000, pyramid,
  57    orion, tahoe, APOLLO and many others */
  58 #ifndef mips
  59 #       define mips
  60 #endif
  61
  62 /* Use type int rather than a union, to represent Lisp_Object */
  63 /* This is desirable for most machines.  */
  64
  65 #define NO_UNION_TYPE
  66
  67 /* Define EXPLICIT_SIGN_EXTEND if XINT must explicitly sign-extend
  68    the 24-bit bit field into an int.  In other words, if bit fields
  69    are always unsigned.
  70
  71    If you use NO_UNION_TYPE, this flag does not matter.  */
  72
  73 #define EXPLICIT_SIGN_EXTEND
  74
  75 /* Data type of load average, as read out of kmem.  */
  76
  77 #define LOAD_AVE_TYPE long
  78
  79 /* Convert that into an integer that is 100 for a load average of 1.0  */
  80
  81 #define LOAD_AVE_CVT(x) (int) (((double) (x)) * 100.0 / 256.0)
  82
  83 /* Define CANNOT_DUMP on machines where unexec does not work.
  84    Then the function dump-emacs will not be defined
  85    and temacs will do (load "loadup") automatically unless told otherwise.  */
  86
  87 #undef CANNOT_DUMP
  88
  89 /* Define VIRT_ADDR_VARIES if the virtual addresses of
  90    pure and impure space as loaded can vary, and even their
  91    relative order cannot be relied on.
  92
  93    Otherwise Emacs assumes that text space precedes data space,
  94    numerically.  */
  95
  96 /* #define VIRT_ADDR_VARIES */
  97
  98 /* Define C_ALLOCA if this machine does not support a true alloca
  99    and the one written in C should be used instead.
 100    Define HAVE_ALLOCA to say that the system provides a properly
 101    working alloca function and it should be used.
 102    Define neither one if an assembler-language alloca
 103    in the file alloca.s should be used.  */
 104
 105 #define C_ALLOCA
 106 /* #define HAVE_ALLOCA */
 107
 108 /* Define NO_REMAP if memory segmentation makes it not work well
 109    to change the boundary between the text section and data section
 110    when Emacs is dumped.  If you define this, the preloaded Lisp
 111    code will not be sharable; but that's better than failing completely.  */
 112
 113 #define NO_REMAP
 114
 115 /* This machine requires completely different unexec code
 116    which lives in a separate file.  Specify the file name.  */
 117
 118 #define UNEXEC unexmips.o
 119
 120 /* Describe layout of the address space in an executing process.  */
 121
 122 #define TEXT_START 0x400000
 123 #define DATA_START 0x800000
 124
 125 /* Alter some of the options used when linking.  */
 126
 127 #ifdef BSD
 128
 129 /* Supposedly the dec machine doesn't have this library.
 130    #define LIBS_MACHINE -lmld  */
 131
 132 #define LD_SWITCH_MACHINE -D 800000
 133 #define LIBS_DEBUG
 134
 135 #else
 136
 137 #define LIBS_MACHINE -lmld
 138 #define LD_SWITCH_MACHINE -D 800000 -g3
 139 #define START_FILES pre-crt0.o /usr/lib/crt1.o
 140 #define LIB_STANDARD -lbsd -lc /usr/lib/crtn.o
 141 #define LIBS_TERMCAP -lcurses
 142
 143 #define C_SWITCH_SYSTEM -I/usr/include/bsd
 144 #define C_DEBUG_SWITCH -O -g3
 145
 146 #if defined(HAVE_X_WINDOWS) && defined(HAVE_X11)
 147 #define HAVE_VFORK              /* Graciously provided by libX.a */
 148 #endif
 149 #endif
 150 \f
 151 /* The standard definitions of these macros would work ok,
 152    but these are faster because the constants are short.  */
 153
 154 #define XUINT(a) (((unsigned)(a) << INTBITS-VALBITS) >> INTBITS-VALBITS)
 155
 156 #define XSET(var, type, ptr) \
 157    ((var) = ((int)(type) << VALBITS) + (((unsigned) (ptr) << INTBITS-VALBITS) >> INTBITS-VALBITS))
 158
 159 #define XSETINT(a, b)  XSET(a, XTYPE(a), b)
 160 #define XSETUINT(a, b) XSET(a, XTYPE(a), b)
 161 #define XSETPNTR(a, b) XSET(a, XTYPE(a), b)
 162
 163 #define XUNMARK(a) ((a) = (((unsigned)(a) << INTBITS-GCTYPEBITS-VALBITS) >> INTBITS-GCTYPEBITS-VALBITS))
 164 #ifdef USG
 165
 166 /* Cancel certain parts of standard sysV support.  */
 167 #undef NONSYSTEM_DIR_LIBRARY
 168 #define SYSV_SYSTEM_DIR
 169 #undef static
 170
 171 /* Don't try to use SIGIO or FIONREAD even though they are defined.  */
 172 #undef SIGIO
 173 #define BROKEN_FIONREAD
 174
 175 /* Describe special kernel features.  */
 176
 177 #define HAVE_SYSVIPC
 178
 179 #define HAVE_TIMEVAL
 180 #if defined(emacs)
 181 #include <bsd/sys/time.h>
 182 #endif
 183
 184 /* #define HAVE_SELECT
 185    The `select' in the system won't work for pipes,
 186    so don't use it.  */
 187
 188 #define HAVE_DUP2
 189 #define HAVE_GETWD
 190 #define HAVE_GETTIMEOFDAY
 191
 192 #define HAVE_PTYS
 193 #define HAVE_SOCKETS
 194
 195 #undef NOMULTIPLEJOBS
 196 #define utimes utime  /* Someone should check this.  */
 197
 198 /* ??? */
 199 #define IRIS
 200
 201 #endif
 202
 203 #ifdef BSD
 204 #define COFF
 205 #define TERMINFO
 206 #undef MAIL_USE_FLOCK  /* Someone should check this.  */
 207 #undef HAVE_UNION_WAIT
 208 #endif /* BSD */