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 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 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.
  61    Ralph Sobek <Ralph.Sobek@cerfacs.fr> says must ignore one arg.  */
  62
  63 #define CRT0_DUMMIES ignore,
  64
  65 /* crt0.c should define a symbol `start' and do .globl with a dot.  */
  66
  67 #define DOT_GLOBAL_START
  68
  69 /* Data type of load average, as read out of kmem.  */
  70
  71 #define LOAD_AVE_TYPE double
  72
  73 /* Convert that into an integer that is 100 for a load average of 1.0  */
  74
  75 #define LOAD_AVE_CVT(x) (int) ((x) * 100.0)
  76
  77 /* Define CANNOT_DUMP on machines where unexec does not work.
  78    Then the function dump-emacs will not be defined
  79    and temacs will do (load "loadup") automatically unless told otherwise.  */
  80
  81 /* #define CANNOT_DUMP */
  82
  83 /* Define VIRT_ADDR_VARIES if the virtual addresses of
  84    pure and impure space as loaded can vary, and even their
  85    relative order cannot be relied on.
  86
  87    Otherwise Emacs assumes that text space precedes data space,
  88    numerically.  */
  89
  90 /*#define VIRT_ADDR_VARIES*/
  91
  92 /* Define C_ALLOCA if this machine does not support a true alloca
  93    and the one written in C should be used instead.
  94    Define HAVE_ALLOCA to say that the system provides a properly
  95    working alloca function and it should be used.
  96    Define neither one if an assembler-language alloca
  97    in the file alloca.s should be used.  */
  98
  99 /* #define C_ALLOCA */
 100 #define HAVE_ALLOCA
 101
 102 /* Must use the system's termcap.  It does special things.  */
 103
 104 #define LIBS_TERMCAP -ltermcap
 105
 106 /* Define NO_REMAP if memory segmentation makes it not work well
 107    to change the boundary between the text section and data section
 108    when Emacs is dumped.  If you define this, the preloaded Lisp
 109    code will not be sharable; but that's better than failing completely.  */
 110
 111 /* #define NO_REMAP */
 112 \f
 113 /* Addresses on the Convex have the high bit set.  */
 114 #define DATA_SEG_BITS (1 << (INTBITS-1))
 115
 116 /* Right shift is logical shift.
 117    And the usual way of handling such machines, which involves
 118    copying the number into sign_extend_temp, does not work
 119    for reasons as yet unknown.  */
 120
 121 #define XINT(a)  sign_extend_lisp_int (a)
 122
 123 /* Convex uses a special version of unexec.  */
 124
 125 #define UNEXEC unexconvex.o
 126
 127 /* you gotta define 'COFF' for post 6.1 unexec. */
 128
 129 #define COFF
 130 #define TEXT_START 0x80001000
 131
 132 /* Posix stuff for Convex OS 8.1 and up. */
 133
 134 #define C_SWITCH_MACHINE -pcc
 135 #define LD_SWITCH_MACHINE \
 136     -e__start -L /usr/lib \
 137     '-A__iob=___ap$$iob' '-A_use_libc_sema=___ap$$use_libc_sema'
 138
 139 /* Use <dirent.h>. */
 140 #define SYSV_SYSTEM_DIR
 141
 142 #ifdef _POSIX_SOURCE
 143
 144 /* These symbols have been undefined to advance the state of the art. */
 145
 146 #define S_IFMT _S_IFMT
 147 #define S_IFDIR _S_IFDIR
 148
 149 #define S_IREAD _S_IREAD
 150 #define S_IWRITE _S_IWRITE
 151 #define S_IEXEC _S_IEXEC
 152
 153 #endif
 154
 155 /* Ptys may start below ptyp0; call a routine to hunt for where. */
 156
 157 #undef FIRST_PTY_LETTER
 158 #define FIRST_PTY_LETTER first_pty_letter()
 159
 160 #if 0
 161 /*
 162  * Force a K&R compilation and libraries with the Convex V 4.0 C compiler
 163  */
 164 #define C_SWITCH_MACHINE -pcc
 165 #define LIB_STANDARD -lc_old
 166 #define LIBS_MACHINE -lC2_old
 167 #define LD_SWITCH_MACHINE -X -NL -fn -Enoposix -A__iob=___ap\$$iob \
 168  -A_use_libc_sema=___ap\$$use_libc_sema -L /usr/lib
 169 #endif