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code.delx.au - gnu-emacs/blob - src/m/convex.h
1 /* machine description file for Convex (all models).
2 Copyright (C) 1987, 1994 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 2, 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, 675 Mass Ave, Cambridge, MA 02139, USA. */
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" */
25 /* The following three symbols give information on
26 the size of various data types. */
28 #define SHORTBITS 16 /* Number of bits in a short */
30 #define INTBITS 32 /* Number of bits in an int */
32 #define LONGBITS 32 /* Number of bits in a long */
34 /* Define BIG_ENDIAN iff lowest-numbered byte in a word
35 is the most significant byte. */
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. */
45 /* Define WORD_MACHINE if addresses and such have
46 * to be corrected before they can be used as byte counts. */
48 /* #define WORD_MACHINE */
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. */
56 /* Use type int rather than a union, to represent Lisp_Object */
57 /* This is desirable for most machines. */
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,
69 /* crt0.c should define a symbol `start' and do .globl with a dot. */
71 #define DOT_GLOBAL_START
73 /* Data type of load average, as read out of kmem. */
75 #define LOAD_AVE_TYPE double
77 /* Convert that into an integer that is 100 for a load average of 1.0 */
79 #define LOAD_AVE_CVT(x) (int) ((x) * 100.0)
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. */
85 /* #define CANNOT_DUMP */
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.
91 Otherwise Emacs assumes that text space precedes data space,
94 /*#define VIRT_ADDR_VARIES*/
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. */
103 /* #define C_ALLOCA */
106 /* Must use the system's termcap. It does special things. */
108 #define LIBS_TERMCAP -ltermcap
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. */
115 /* #define NO_REMAP */
117 /* Addresses on the Convex have the high bit set. */
118 #define DATA_SEG_BITS (1 << (INTBITS-1))
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. */
125 #define XINT(a) sign_extend_lisp_int (a)
127 /* Convex uses a special version of unexec. */
129 #define UNEXEC unexconvex.o
131 /* you gotta define 'COFF' for post 6.1 unexec. */
134 #define TEXT_START 0x80001000
136 /* Posix stuff for Convex OS 8.1 and up. */
138 #define LD_SWITCH_MACHINE \
139 -e__start -L /usr/lib \
140 '-A__iob=___ap$$iob' '-A_use_libc_sema=___ap$$use_libc_sema'
142 /* Use <dirent.h>. */
143 #define SYSV_SYSTEM_DIR
147 /* These symbols have been undefined to advance the state of the art. */
149 #define S_IFMT _S_IFMT
150 #define S_IFDIR _S_IFDIR
152 #define S_IREAD _S_IREAD
153 #define S_IWRITE _S_IWRITE
154 #define S_IEXEC _S_IEXEC
158 /* Ptys may start below ptyp0; call a routine to hunt for where. */
160 #undef FIRST_PTY_LETTER
161 #define FIRST_PTY_LETTER first_pty_letter()
165 * Force a K&R compilation and libraries with the Convex V 4.0 C compiler
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
174 /* Avoid error in xrdb.c - d.m.cooke@larc.nasa.gov. */
175 #define DECLARE_GETPWUID_WITH_UID_T
177 /* Call getpgrp properly. */
178 #define GETPGRP_NO_ARG
180 /* Tested for both Convex C and GNUC by d.m.cooke@larc.nasa.gov. */
181 #define LIBS_MACHINE -lC2
183 /* Avoid error in getloadavg.c. */
184 #define NLIST_NAME_UNION 1
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
193 #define ORDINARY_LINK
195 #undef LD_SWITCH_MACHINE
196 #define LD_SWITCH_MACHINE \
198 '-A__iob=___ap$$iob' '-A_use_libc_sema=___ap$$use_libc_sema'