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Diffstat (limited to 'src/m/elxsi.h')
-rw-r--r-- | src/m/elxsi.h | 153 |
1 files changed, 153 insertions, 0 deletions
diff --git a/src/m/elxsi.h b/src/m/elxsi.h new file mode 100644 index 00000000000..9f79c7919a6 --- /dev/null +++ b/src/m/elxsi.h @@ -0,0 +1,153 @@ +/* machine description file for Elxsi machine (running enix). + Copyright (C) 1986 Free Software Foundation, Inc. + Adapted by John Salmon + +This file is part of GNU Emacs. + +GNU Emacs is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 1, or (at your option) +any later version. + +GNU Emacs is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +GNU General Public License for more details. + +You should have received a copy of the GNU General Public License +along with GNU Emacs; see the file COPYING. If not, write to +the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ + +/* The following line tells the configuration script what sort of + operating system this machine is likely to run. + USUAL-OPSYS="usg5-2" */ + +/* This file was modified by Matt Crawford <matt@tank.uchicago.edu> + to work under Elxsi's 12.0 release of BSD unix. */ + +/* The following three symbols give information on + the size of various data types. */ + +#define SHORTBITS 16 /* Number of bits in a short */ + +#define INTBITS 32 /* Number of bits in an int */ + +#define LONGBITS 32 /* Number of bits in a long */ + +/* Define BIG_ENDIAN iff lowest-numbered byte in a word + is the most significant byte. */ + +/*#define BIG_ENDIAN*/ + +/* Define NO_ARG_ARRAY if you cannot take the address of the first of a + * group of arguments and treat it as an array of the arguments. */ + +/*#define NO_ARG_ARRAY */ + +/* Define WORD_MACHINE if addresses and such have + * to be corrected before they can be used as byte counts. */ + +/*#define WORD_MACHINE */ + +/* Define how to take a char and sign-extend into an int. + On machines where char is signed, this is a no-op. */ + +#define SIGN_EXTEND_CHAR(c) ((int)c) + +/* Now define a symbol for the cpu type, if your compiler + does not define it automatically: + vax, m68000, ns16000, pyramid, orion, tahoe and APOLLO + are the ones defined so far. */ + +#ifndef elxsi +#define elxsi +#endif + +/* Use type int rather than a union, to represent Lisp_Object */ +/* This is desirable for most machines. */ + +#define NO_UNION_TYPE + +/* Define EXPLICIT_SIGN_EXTEND if XINT must explicitly sign-extend + the 24-bit bit field into an int. In other words, if bit fields + are always unsigned. + + If you use NO_UNION_TYPE, this flag does not matter. */ + +#define EXPLICIT_SIGN_EXTEND + + +/* Name of kernel load average variable */ + +#undef LDAV_SYMBOL +#define LDAV_SYMBOL "avenrun" + +/* Data type of load average, as read out of kmem. */ + +#define LOAD_AVE_TYPE double + +/* Convert that into an integer that is 100 for a load average of 1.0 */ + +#define LOAD_AVE_CVT(x) (int) ((x) * 100.0) + +/* Define CANNOT_DUMP on machines where unexec does not work. + Then the function dump-emacs will not be defined + and temacs will do (load "loadup") automatically unless told otherwise. + + The Elxsi can in principle dump, but the necessary changes to + unexec, which involve byte-swapping, were too ugly to install. + If someone submits simple code that supports dumping on the Elxsi, + it can be installed and CANNOT_DUMP can be turned off. */ + +/* #define CANNOT_DUMP */ + +/* Define VIRT_ADDR_VARIES if the virtual addresses of + pure and impure space as loaded can vary, and even their + relative order cannot be relied on. + + Otherwise Emacs assumes that text space precedes data space, + numerically. */ + +/* #define VIRT_ADDR_VARIES */ + +/* Define C_ALLOCA if this machine does not support a true alloca + and the one written in C should be used instead. + Define HAVE_ALLOCA to say that the system provides a properly + working alloca function and it should be used. + Define neither one if an assembler-language alloca + in the file alloca.s should be used. */ + +#define C_ALLOCA +/*#define HAVE_ALLOCA */ + +/* Define NO_REMAP if memory segmentation makes it not work well + to change the boundary between the text section and data section + when Emacs is dumped. If you define this, the preloaded Lisp + code will not be sharable; but that's better than failing completely. */ +/*#define NO_REMAP*/ + +/* This is a guess for an alternate solution to whatever + problem motivated defining _sobuf in sysdep,c with extern char *_sobuf. */ +#define _sobuf xsobuf + +/* Address of start of text segment as loaded. */ + +#define TEXT_START 0x800 + +/* Tell crt0.c not to define environ. */ + +#define DONT_NEED_ENVIRON + +/* The elxsi has no debugger, so might as well optimize instead + of trying to make a symbol table. */ + +#define C_DEBUG_SWITCH -O + +/* Elxsi uses COFF under both Sys V and BSD environments */ + +#define COFF + +#define ADJUST_EXEC_HEADER {\ +extern int _init_brk;\ +_init_brk = bss_start;\ +} |