src/m/ibms390x.h

   1 /* machine description file for IBM S390 in 64-bit mode
   2    Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008
   3      Free Software Foundation, Inc.
   4
   5 This file is part of GNU Emacs.
   6
   7 GNU Emacs is free software: you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation, either version 3 of the License, or
  10 (at your option) any later version.
  11
  12 GNU Emacs is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 /* This file was made by copying the significant parts of amdx86-64.h
  21    into ibms390.h.  */
  22
  23
  24 /* The following line tells the configuration script what sort of
  25    operating system this machine is likely to run.
  26    USUAL-OPSYS="<name of system .h file here, without the s- or .h>"
  27
  28 NOTE-START
  29 IBM s390 64 bits (-machine=ibms390x64)
  30
  31   The possibilities for -opsystem are: gnu-linux.
  32
  33 NOTE-END */
  34
  35 #define BITS_PER_LONG 64
  36 #define BITS_PER_EMACS_INT 64
  37
  38 /* Define WORDS_BIG_ENDIAN if lowest-numbered byte in a word
  39    is the most significant byte.  */
  40
  41 #define WORDS_BIG_ENDIAN
  42
  43 /* Define NO_ARG_ARRAY if you cannot take the address of the first of a
  44  * group of arguments and treat it as an array of the arguments.  */
  45
  46 #define NO_ARG_ARRAY
  47
  48 /* Define WORD_MACHINE if addresses and such have
  49  * to be corrected before they can be used as byte counts.  */
  50
  51 #define WORD_MACHINE
  52
  53 /* Now define a symbol for the cpu type, if your compiler
  54    does not define it automatically:
  55    Ones defined so far include vax, m68000, ns16000, pyramid,
  56    orion, tahoe, APOLLO and many others */
  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 the type to use.  */
  64 #define EMACS_INT long
  65 #define EMACS_UINT unsigned long
  66 #define SPECIAL_EMACS_INT
  67
  68 /* Define EXPLICIT_SIGN_EXTEND if XINT must explicitly sign-extend
  69    the 24-bit bit field into an int.  In other words, if bit fields
  70    are always unsigned.
  71
  72    If you use NO_UNION_TYPE, this flag does not matter.  */
  73
  74 #undef EXPLICIT_SIGN_EXTEND
  75
  76 /* Data type of load average, as read out of kmem.  */
  77
  78 #define LOAD_AVE_TYPE long
  79
  80 /* Convert that into an integer that is 100 for a load average of 1.0  */
  81
  82 #define LOAD_AVE_CVT(x) (int) (((double) (x)) * 100.0 / FSCALE)
  83
  84 /* Define CANNOT_DUMP on machines where unexec does not work.
  85    Then the function dump-emacs will not be defined
  86    and temacs will do (load "loadup") automatically unless told otherwise.  */
  87
  88 #undef CANNOT_DUMP
  89
  90 /* Define VIRT_ADDR_VARIES if the virtual addresses of
  91    pure and impure space as loaded can vary, and even their
  92    relative order cannot be relied on.
  93
  94    Otherwise Emacs assumes that text space precedes data space,
  95    numerically.  */
  96
  97 #define VIRT_ADDR_VARIES
  98
  99 /* Define HAVE_ALLOCA to say that the system provides a properly
 100    working alloca function and it should be used.  Undefine it if an
 101    assembler-language alloca in the file alloca.s should be used. */
 102
 103 #define HAVE_ALLOCA
 104
 105 /* Define NO_REMAP if memory segmentation makes it not work well
 106    to change the boundary between the text section and data section
 107    when Emacs is dumped.  If you define this, the preloaded Lisp
 108    code will not be sharable; but that's better than failing completely.  */
 109
 110 #undef NO_REMAP
 111
 112 /* Some really obscure 4.2-based systems (like Sequent DYNIX)
 113  * do not support asynchronous I/O (using SIGIO) on sockets,
 114  * even though it works fine on tty's.  If you have one of
 115  * these systems, define the following, and then use it in
 116  * config.h (or elsewhere) to decide when (not) to use SIGIO.
 117  *
 118  * You'd think this would go in an operating-system description file,
 119  * but since it only occurs on some, but not all, BSD systems, the
 120  * reasonable place to select for it is in the machine description
 121  * file.
 122  */
 123
 124 #undef NO_SOCK_SIGIO
 125
 126
 127 /* After adding support for a new system, modify the large case
 128    statement in the `configure' script to recognize reasonable
 129    configuration names, and add a description of the system to
 130    `etc/MACHINES'.
 131
 132    If you've just fixed a problem in an existing configuration file,
 133    you should also check `etc/MACHINES' to make sure its descriptions
 134    of known problems in that configuration should be updated.  */
 135
 136 #define PNTR_COMPARISON_TYPE unsigned long
 137
 138 /* On the 64 bit architecture, we can use 60 bits for addresses */
 139
 140 #define VALBITS         60
 141
 142 #define LINKER $(CC) -nostdlib
 143
 144 /* Define XINT and XUINT so that they can take arguments of type int */
 145 #define XINT(a)  (((long) (a) << (BITS_PER_LONG - VALBITS)) >> (BITS_PER_LONG - VALBITS))
 146 #define XUINT(a) ((long) (a) & VALMASK)
 147
 148 /* Define XPNTR to avoid or'ing with DATA_SEG_BITS */
 149
 150 #define XPNTR(a) XUINT (a)
 151
 152 #undef START_FILES
 153 #ifdef HAVE_LIB64_DIR
 154 #define START_FILES pre-crt0.o /usr/lib64/crt1.o /usr/lib64/crti.o
 155 #else
 156 #define START_FILES pre-crt0.o /usr/lib/crt1.o /usr/lib/crti.o
 157 #endif
 158
 159 #undef LIB_STANDARD
 160 #ifdef HAVE_LIB64_DIR
 161 #define LIB_STANDARD -lgcc -lc -lgcc /usr/lib64/crtn.o
 162 #else
 163 #define LIB_STANDARD -lgcc -lc -lgcc /usr/lib/crtn.o
 164 #endif
 165
 166 /* arch-tag: 4b87653c-6add-4663-8691-7d9dc17b5519
 167    (do not change this comment) */