src/m/convex.h

   1 /* machine description file for Convex (all models).
   2    Copyright (C) 1987, 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, 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="bsd4-3"  */
  24
  25 /* The following three symbols give information on
  26  the size of various data types.  */
  27
  28 #define SHORTBITS 16            /* Number of bits in a short */
  29
  30 #define INTBITS 32              /* Number of bits in an int */
  31
  32 #define LONGBITS 32             /* Number of bits in a long */
  33
  34 /* Define WORDS_BIG_ENDIAN iff lowest-numbered byte in a word
  35    is the most significant byte.  */
  36
  37 #define WORDS_BIG_ENDIAN
  38
  39 /* Define NO_ARG_ARRAY if you cannot take the address of the first of a
  40  * group of arguments and treat it as an array of the arguments.
  41  * Maybe it would be better to simply correct the code. */
  42
  43 #define NO_ARG_ARRAY
  44
  45 /* Define WORD_MACHINE if addresses and such have
  46  * to be corrected before they can be used as byte counts.  */
  47
  48 /* #define WORD_MACHINE */
  49
  50 /* Now define a symbol for the cpu type, if your compiler
  51    does not define it automatically.  */
  52 #ifndef convex  /* The compiler doesn't always do this.  */
  53 #define convex
  54 #endif
  55
  56 /* Use type int rather than a union, to represent Lisp_Object */
  57 /* This is desirable for most machines.  */
  58
  59 #define NO_UNION_TYPE
  60
  61 #ifndef __GNUC__ /* David M. Cooke <dcooke@haven.larc.nasa.gov>
  62                     and Ralph Sobek <Ralph.Sobek@cerfacs.fr> agree
  63                     must ignore one arg when compiled with convex compiler.  */
  64 #define CRT0_DUMMIES ignore,
  65 #else
  66 #define CRT0_DUMMIES
  67 #endif
  68
  69 /* crt0.c should define a symbol `start' and do .globl with a dot.  */
  70
  71 #define DOT_GLOBAL_START
  72
  73 /* Data type of load average, as read out of kmem.  */
  74
  75 #define LOAD_AVE_TYPE double
  76
  77 /* Convert that into an integer that is 100 for a load average of 1.0  */
  78
  79 #define LOAD_AVE_CVT(x) (int) ((x) * 100.0)
  80
  81 /* Define CANNOT_DUMP on machines where unexec does not work.
  82    Then the function dump-emacs will not be defined
  83    and temacs will do (load "loadup") automatically unless told otherwise.  */
  84
  85 /* #define CANNOT_DUMP */
  86
  87 /* Define VIRT_ADDR_VARIES if the virtual addresses of
  88    pure and impure space as loaded can vary, and even their
  89    relative order cannot be relied on.
  90
  91    Otherwise Emacs assumes that text space precedes data space,
  92    numerically.  */
  93
  94 /*#define VIRT_ADDR_VARIES*/
  95
  96 /* Define C_ALLOCA if this machine does not support a true alloca
  97    and the one written in C should be used instead.
  98    Define HAVE_ALLOCA to say that the system provides a properly
  99    working alloca function and it should be used.
 100    Define neither one if an assembler-language alloca
 101    in the file alloca.s should be used.  */
 102
 103 /* #define C_ALLOCA */
 104 #define HAVE_ALLOCA
 105
 106 /* Must use the system's termcap.  It does special things.  */
 107
 108 #define LIBS_TERMCAP -ltermcap
 109
 110 /* Define NO_REMAP if memory segmentation makes it not work well
 111    to change the boundary between the text section and data section
 112    when Emacs is dumped.  If you define this, the preloaded Lisp
 113    code will not be sharable; but that's better than failing completely.  */
 114
 115 /* #define NO_REMAP */
 116 \f
 117 /* Addresses on the Convex have the high bit set.  */
 118 #define DATA_SEG_BITS (1 << (INTBITS-1))
 119
 120 /* Right shift is logical shift.
 121    And the usual way of handling such machines, which involves
 122    copying the number into sign_extend_temp, does not work
 123    for reasons as yet unknown.  */
 124
 125 #define XINT(a)  sign_extend_lisp_int (a)
 126
 127 /* Convex uses a special version of unexec.  */
 128
 129 #define UNEXEC unexconvex.o
 130
 131 /* you gotta define 'COFF' for post 6.1 unexec. */
 132
 133 #define COFF
 134 #define TEXT_START 0x80001000
 135
 136 /* Posix stuff for Convex OS 8.1 and up. */
 137
 138 #define LD_SWITCH_MACHINE \
 139     -e__start -L /usr/lib \
 140     '-A__iob=___ap$$iob' '-A_use_libc_sema=___ap$$use_libc_sema'
 141
 142 /* Use <dirent.h>. */
 143 #define SYSV_SYSTEM_DIR
 144
 145 #ifdef _POSIX_SOURCE
 146
 147 /* These symbols have been undefined to advance the state of the art. */
 148
 149 #define S_IFMT _S_IFMT
 150 #define S_IFDIR _S_IFDIR
 151
 152 #define S_IREAD _S_IREAD
 153 #define S_IWRITE _S_IWRITE
 154 #define S_IEXEC _S_IEXEC
 155
 156 #endif
 157
 158 /* Ptys may start below ptyp0; call a routine to hunt for where. */
 159
 160 #undef FIRST_PTY_LETTER
 161 #define FIRST_PTY_LETTER first_pty_letter()
 162
 163 #if 0
 164 /*
 165  * Force a K&R compilation and libraries with the Convex V 4.0 C compiler
 166  */
 167 #define C_SWITCH_MACHINE -pcc
 168 #define LIB_STANDARD -lc_old
 169 #define LIBS_MACHINE -lC2_old
 170 #define LD_SWITCH_MACHINE -X -NL -fn -Enoposix -A__iob=___ap\$$iob \
 171  -A_use_libc_sema=___ap\$$use_libc_sema -L /usr/lib
 172 #endif
 173
 174 /* Avoid error in xrdb.c - d.m.cooke@larc.nasa.gov.  */
 175 #define DECLARE_GETPWUID_WITH_UID_T
 176
 177 /* Call getpgrp properly.  */
 178 #define GETPGRP_NO_ARG
 179
 180 /* Tested for both Convex C and GNUC by d.m.cooke@larc.nasa.gov.  */
 181 #define LIBS_MACHINE -lC2
 182
 183 /* Avoid error in getloadavg.c.  */
 184 #define NLIST_NAME_UNION  1
 185
 186 #if 0  /* This is supposed to be an improvement.
 187           It would be good for people to try enabling this code
 188           and report the results.  */
 189 /* gcc -nostdlib prevents some math symbols from being included.
 190    So we have to use -nostartfiles instead. */
 191 #define LINKER $(CC) -nostartfiles
 192
 193 #define ORDINARY_LINK
 194
 195 #undef LD_SWITCH_MACHINE
 196 #define LD_SWITCH_MACHINE \
 197     -L /usr/lib \
 198     '-A__iob=___ap$$iob' '-A_use_libc_sema=___ap$$use_libc_sema'
 199 #endif