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Annotation of GNUtools/emacs/src/m-elxsi.h, revision 1.1

1.1     ! root        1: /* m- file for Elxsi machine (running enix).
        !             2:    Copyright (C) 1986 Free Software Foundation, Inc.
        !             3:    Adapted by John Salmon
        !             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 1, or (at your option)
        !            10: 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; see the file COPYING.  If not, write to
        !            19: the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
        !            20: 
        !            21: 
        !            22: /* The following three symbols give information on
        !            23:  the size of various data types.  */
        !            24: 
        !            25: #define SHORTBITS 16           /* Number of bits in a short */
        !            26: 
        !            27: #define INTBITS 32             /* Number of bits in an int */
        !            28: 
        !            29: #define LONGBITS 32            /* Number of bits in a long */
        !            30: 
        !            31: /* Define BIG_ENDIAN iff lowest-numbered byte in a word
        !            32:    is the most significant byte.  */
        !            33: 
        !            34: /*#define BIG_ENDIAN*/
        !            35: 
        !            36: /* Define NO_ARG_ARRAY if you cannot take the address of the first of a
        !            37:  * group of arguments and treat it as an array of the arguments.  */
        !            38: 
        !            39: /*#define NO_ARG_ARRAY */
        !            40: 
        !            41: /* Define WORD_MACHINE if addresses and such have
        !            42:  * to be corrected before they can be used as byte counts.  */
        !            43: 
        !            44: #define WORD_MACHINE
        !            45: 
        !            46: /* Define how to take a char and sign-extend into an int.
        !            47:    On machines where char is signed, this is a no-op.  */
        !            48: 
        !            49: #define SIGN_EXTEND_CHAR(c) ((int)c)
        !            50: 
        !            51: /* Now define a symbol for the cpu type, if your compiler
        !            52:    does not define it automatically:
        !            53:    vax, m68000, ns16000, pyramid, orion, tahoe and APOLLO
        !            54:    are the ones defined so far.  */
        !            55: 
        !            56: #ifndef elxsi
        !            57: #define elxsi
        !            58: #endif
        !            59: 
        !            60: /* Use type int rather than a union, to represent Lisp_Object */
        !            61: /* This is desirable for most machines.  */
        !            62: 
        !            63: #define NO_UNION_TYPE
        !            64: 
        !            65: /* Define EXPLICIT_SIGN_EXTEND if XINT must explicitly sign-extend
        !            66:    the 24-bit bit field into an int.  In other words, if bit fields
        !            67:    are always unsigned.
        !            68: 
        !            69:    If you use NO_UNION_TYPE, this flag does not matter.  */
        !            70: 
        !            71: #define EXPLICIT_SIGN_EXTEND
        !            72: 
        !            73: /* Data type of load average, as read out of kmem.  */
        !            74: 
        !            75: /*#define LOAD_AVE_TYPE long */
        !            76: 
        !            77: /* Convert that into an integer that is 100 for a load average of 1.0  */
        !            78: 
        !            79: /*#define LOAD_AVE_CVT(x) (int) (((double) (x)) * 100.0 / FSCALE) */
        !            80: 
        !            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.
        !            84: 
        !            85:    The Elxsi can in principle dump, but the necessary changes to
        !            86:    unexec, which involve byte-swapping, were too ugly to install.
        !            87:    If someone submits simple code that supports dumping on the Elxsi,
        !            88:    it can be installed and CANNOT_DUMP can be turned off.  */
        !            89: 
        !            90: #define CANNOT_DUMP
        !            91: 
        !            92: /* Define VIRT_ADDR_VARIES if the virtual addresses of
        !            93:    pure and impure space as loaded can vary, and even their
        !            94:    relative order cannot be relied on.
        !            95: 
        !            96:    Otherwise Emacs assumes that text space precedes data space,
        !            97:    numerically.  */
        !            98: 
        !            99: /* #define VIRT_ADDR_VARIES */
        !           100: 
        !           101: /* Define C_ALLOCA if this machine does not support a true alloca
        !           102:    and the one written in C should be used instead.
        !           103:    Define HAVE_ALLOCA to say that the system provides a properly
        !           104:    working alloca function and it should be used.
        !           105:    Define neither one if an assembler-language alloca
        !           106:    in the file alloca.s should be used.  */
        !           107: 
        !           108: #define C_ALLOCA
        !           109: /*#define HAVE_ALLOCA */
        !           110: 
        !           111: /* Define NO_REMAP if memory segmentation makes it not work well
        !           112:    to change the boundary between the text section and data section
        !           113:    when Emacs is dumped.  If you define this, the preloaded Lisp
        !           114:    code will not be sharable; but that's better than failing completely.  */
        !           115: /*#define NO_REMAP*/
        !           116: 
        !           117: /* This is a guess for an alternate solution to whatever
        !           118:    problem motivated defining _sobuf in sysdep,c with extern char *_sobuf.  */
        !           119: #define _sobuf xsobuf
        !           120: 
        !           121: /* Address of start of text segment as loaded.  */
        !           122: 
        !           123: #define TEXT_START     0x800
        !           124: 
        !           125: /* Tell crt0.c not to define environ.  */
        !           126: 
        !           127: #define DONT_NEED_ENVIRON
        !           128: 
        !           129: /* The elxsi has no debugger, so might as well optimize instead
        !           130:    of trying to make a symbol table.  */
        !           131: 
        !           132: #define C_DEBUG_SWITCH -O

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