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code.delx.au - gnu-emacs/blob - src/m/ibms390x.h
1 /* machine description file for IBM S390 in 64-bit mode
2 Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
4 This file is part of GNU Emacs.
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 3, or (at your option)
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.
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, Inc., 51 Franklin Street, Fifth Floor,
19 Boston, MA 02110-1301, USA. */
21 /* This file was made by copying the significant parts of amdx86-64.h
25 /* The following line tells the configuration script what sort of
26 operating system this machine is likely to run.
27 USUAL-OPSYS="<name of system .h file here, without the s- or .h>"
30 IBM s390 64 bits (-machine=ibms390x64)
32 The possibilities for -opsystem are: gnu-linux.
36 #define BITS_PER_LONG 64
37 #define BITS_PER_EMACS_INT 64
39 /* Define WORDS_BIG_ENDIAN if lowest-numbered byte in a word
40 is the most significant byte. */
42 #define WORDS_BIG_ENDIAN
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. */
49 /* Define WORD_MACHINE if addresses and such have
50 * to be corrected before they can be used as byte counts. */
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 */
59 /* Use type int rather than a union, to represent Lisp_Object */
60 /* This is desirable for most machines. */
64 /* Define the type to use. */
65 #define EMACS_INT long
66 #define EMACS_UINT unsigned long
67 #define SPECIAL_EMACS_INT
69 /* Define EXPLICIT_SIGN_EXTEND if XINT must explicitly sign-extend
70 the 24-bit bit field into an int. In other words, if bit fields
73 If you use NO_UNION_TYPE, this flag does not matter. */
75 #undef EXPLICIT_SIGN_EXTEND
77 /* Data type of load average, as read out of kmem. */
79 #define LOAD_AVE_TYPE long
81 /* Convert that into an integer that is 100 for a load average of 1.0 */
83 #define LOAD_AVE_CVT(x) (int) (((double) (x)) * 100.0 / FSCALE)
85 /* Define CANNOT_DUMP on machines where unexec does not work.
86 Then the function dump-emacs will not be defined
87 and temacs will do (load "loadup") automatically unless told otherwise. */
91 /* Define VIRT_ADDR_VARIES if the virtual addresses of
92 pure and impure space as loaded can vary, and even their
93 relative order cannot be relied on.
95 Otherwise Emacs assumes that text space precedes data space,
98 #define VIRT_ADDR_VARIES
100 /* Define HAVE_ALLOCA to say that the system provides a properly
101 working alloca function and it should be used. Undefine it if an
102 assembler-language alloca in the file alloca.s should be used. */
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. */
113 /* Some really obscure 4.2-based systems (like Sequent DYNIX)
114 * do not support asynchronous I/O (using SIGIO) on sockets,
115 * even though it works fine on tty's. If you have one of
116 * these systems, define the following, and then use it in
117 * config.h (or elsewhere) to decide when (not) to use SIGIO.
119 * You'd think this would go in an operating-system description file,
120 * but since it only occurs on some, but not all, BSD systems, the
121 * reasonable place to select for it is in the machine description
128 /* After adding support for a new system, modify the large case
129 statement in the `configure' script to recognize reasonable
130 configuration names, and add a description of the system to
133 If you've just fixed a problem in an existing configuration file,
134 you should also check `etc/MACHINES' to make sure its descriptions
135 of known problems in that configuration should be updated. */
137 #define PNTR_COMPARISON_TYPE unsigned long
139 /* On the 64 bit architecture, we can use 60 bits for addresses */
143 #define LINKER $(CC) -nostdlib
145 /* Define XINT and XUINT so that they can take arguments of type int */
146 #define XINT(a) (((long) (a) << (BITS_PER_LONG - VALBITS)) >> (BITS_PER_LONG - VALBITS))
147 #define XUINT(a) ((long) (a) & VALMASK)
149 /* Define XPNTR to avoid or'ing with DATA_SEG_BITS */
151 #define XPNTR(a) XUINT (a)
154 #define START_FILES pre-crt0.o /usr/lib64/crt1.o /usr/lib64/crti.o
157 #define LIB_STANDARD -lgcc -lc -lgcc /usr/lib64/crtn.o
159 /* arch-tag: 4b87653c-6add-4663-8691-7d9dc17b5519
160 (do not change this comment) */