src/m/convex.h

   1 /* machine description file for convex C1.
   2    Copyright (C) 1987 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="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 BIG_ENDIAN iff lowest-numbered byte in a word
  35    is the most significant byte.  */
  36
  37 #define 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
  53 /* convex already defined... */
  54
  55 /* Use type int rather than a union, to represent Lisp_Object */
  56 /* This is desirable for most machines.  */
  57
  58 #define NO_UNION_TYPE
  59
  60 /* crt0.c should use the vax-bsd style of entry, with no dummy args.  */
  61
  62 #define CRT0_DUMMIES
  63
  64 /* crt0.c should define a symbol `start' and do .globl with a dot.  */
  65
  66 #define DOT_GLOBAL_START
  67
  68 /* Data type of load average, as read out of kmem.  */
  69
  70 #define LOAD_AVE_TYPE double
  71
  72 /* Convert that into an integer that is 100 for a load average of 1.0  */
  73
  74 #define LOAD_AVE_CVT(x) (int) ((x) * 100.0)
  75
  76 /* Define CANNOT_DUMP on machines where unexec does not work.
  77    Then the function dump-emacs will not be defined
  78    and temacs will do (load "loadup") automatically unless told otherwise.  */
  79
  80 /* #define CANNOT_DUMP */
  81
  82 /* Define VIRT_ADDR_VARIES if the virtual addresses of
  83    pure and impure space as loaded can vary, and even their
  84    relative order cannot be relied on.
  85
  86    Otherwise Emacs assumes that text space precedes data space,
  87    numerically.  */
  88
  89 /*#define VIRT_ADDR_VARIES*/
  90
  91 /* Define C_ALLOCA if this machine does not support a true alloca
  92    and the one written in C should be used instead.
  93    Define HAVE_ALLOCA to say that the system provides a properly
  94    working alloca function and it should be used.
  95    Define neither one if an assembler-language alloca
  96    in the file alloca.s should be used.  */
  97
  98 /*#define C_ALLOCA*/
  99 #define HAVE_ALLOCA
 100
 101 /* Define NO_REMAP if memory segmentation makes it not work well
 102    to change the boundary between the text section and data section
 103    when Emacs is dumped.  If you define this, the preloaded Lisp
 104    code will not be sharable; but that's better than failing completely.  */
 105
 106 /* #define NO_REMAP */
 107 \f
 108 /* Addresses on the Convex have the high bit set.  */
 109 #define DATA_SEG_BITS (1 << (INTBITS-1))
 110
 111 /* Right shift is logical shift.
 112    And the usual way of handling such machines, which involves
 113    copying the number into sign_extend_temp, does not work
 114    for reasons as yet unknown.  */
 115
 116 #define XINT(a)  sign_extend_lisp_int (a)
 117
 118 /* Convex uses a special version of unexec.  */
 119
 120 #define UNEXEC unexconvex.o
 121
 122 /* you gotta define 'COFF' for post 6.1 unexec. */
 123
 124 #define COFF
 125 #define TEXT_START 0x80001000
 126
 127 /* Posix stuff for Convex OS 8.1 and up. */
 128
 129 #define C_SWITCH_MACHINE -pcc
 130 #define LD_SWITCH_MACHINE \
 131     -e__start -L /usr/lib \
 132     '-A__iob=___ap$$iob' '-A_use_libc_sema=___ap$$use_libc_sema'
 133
 134 /* Use setsid when starting up inferiors. */
 135 #define HAVE_SETSID
 136
 137 /* Use <dirent.h>. */
 138 #define SYSV_SYSTEM_DIR
 139 #define HAVE_CLOSEDIR
 140
 141 #ifdef _POSIX_SOURCE
 142
 143 /* These symbols have been undefined to advance the state of the art. */
 144
 145 #define S_IFMT _S_IFMT
 146 #define S_IFDIR _S_IFDIR
 147
 148 #define S_IREAD _S_IREAD
 149 #define S_IWRITE _S_IWRITE
 150 #define S_IEXEC _S_IEXEC
 151
 152 #endif
 153
 154 /* Ptys may start below ptyp0; call a routine to hunt for where. */
 155
 156 #undef FIRST_PTY_LETTER
 157 #define FIRST_PTY_LETTER first_pty_letter()
 158
 159 #if 0
 160 /*
 161  * Force a K&R compilation and libraries with the Convex V 4.0 C compiler
 162  */
 163 #define C_SWITCH_MACHINE -pcc
 164 #define LIB_STANDARD -lc_old
 165 #define LIBS_MACHINE -lC2_old
 166 #define LD_SWITCH_MACHINE -X -NL -fn -Enoposix -A__iob=___ap\$$iob \
 167  -A_use_libc_sema=___ap\$$use_libc_sema -L /usr/lib
 168 #endif