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Annotation of 43BSDReno/contrib/emacs-18.55/src/m-ibmrt.h, revision 1.1

1.1     ! root        1: /* RTPC machine dependent defines 
        !             2:    Copyright (C) 1986 Free Software Foundation, Inc.
        !             3: 
        !             4: This file is part of GNU Emacs.
        !             5: 
        !             6: GNU Emacs is distributed in the hope that it will be useful,
        !             7: but WITHOUT ANY WARRANTY.  No author or distributor
        !             8: accepts responsibility to anyone for the consequences of using it
        !             9: or for whether it serves any particular purpose or works at all,
        !            10: unless he says so in writing.  Refer to the GNU Emacs General Public
        !            11: License for full details.
        !            12: 
        !            13: Everyone is granted permission to copy, modify and redistribute
        !            14: GNU Emacs, but only under the conditions described in the
        !            15: GNU Emacs General Public License.   A copy of this license is
        !            16: supposed to have been given to you along with GNU Emacs so you
        !            17: can know your rights and responsibilities.  It should be in a
        !            18: file named COPYING.  Among other things, the copyright notice
        !            19: and this notice must be preserved on all copies.  */
        !            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) (((c) & 0x80) ? ((c) | 0xffffff80) : (c))
        !            50: 
        !            51: /* Now define a symbol for the cpu type, if your compiler
        !            52:    does not define it automatically.  */
        !            53: 
        !            54: #define ibmrt
        !            55: #define romp /* unfortunately old include files are hanging around.  */
        !            56: 
        !            57: /* Use type int rather than a union, to represent Lisp_Object */
        !            58: /* This is desirable for most machines.  */
        !            59: 
        !            60: #define NO_UNION_TYPE
        !            61: 
        !            62: /* Define EXPLICIT_SIGN_EXTEND if XINT must explicitly sign-extend
        !            63:    the 24-bit bit field into an int.  In other words, if bit fields
        !            64:    are always unsigned.
        !            65: 
        !            66:    If you use NO_UNION_TYPE, this flag does not matter.  */
        !            67: 
        !            68: #define EXPLICIT_SIGN_EXTEND
        !            69: 
        !            70: /* Data type of load average, as read out of kmem.  */
        !            71: 
        !            72: #define LOAD_AVE_TYPE double   /* For AIS (sysV) */
        !            73: 
        !            74: /* Convert that into an integer that is 100 for a load average of 1.0  */
        !            75: 
        !            76: #define LOAD_AVE_CVT(x) (int) (((double) (x)) * 100.0)
        !            77: 
        !            78: /* Define CANNOT_DUMP on machines where unexec does not work.
        !            79:    Then the function dump-emacs will not be defined
        !            80:    and temacs will do (load "loadup") automatically unless told otherwise.  */
        !            81: 
        !            82: /* #define CANNOT_DUMP */
        !            83: 
        !            84: /* Define VIRT_ADDR_VARIES if the virtual addresses of
        !            85:    pure and impure space as loaded can vary, and even their
        !            86:    relative order cannot be relied on.
        !            87: 
        !            88:    Otherwise Emacs assumes that text space precedes data space,
        !            89:    numerically.  */
        !            90: 
        !            91: #undef VIRT_ADDR_VARIES
        !            92: 
        !            93: /* Define C_ALLOCA if this machine does not support a true alloca
        !            94:    and the one written in C should be used instead.
        !            95:    Define HAVE_ALLOCA to say that the system provides a properly
        !            96:    working alloca function and it should be used.
        !            97:    Define neither one if an assembler-language alloca
        !            98:    in the file alloca.s should be used.  */
        !            99: 
        !           100: #define HAVE_ALLOCA
        !           101: 
        !           102: /* The data segment in this machine starts at a fixed address.
        !           103:    An address of data cannot be stored correctly in a Lisp object;
        !           104:    we always lose the high bits.  We must tell XPNTR to add them back.  */
        !           105: 
        !           106: #define DATA_SEG_BITS 0x10000000
        !           107: #define DATA_START    0x10000000
        !           108: 
        !           109: /* The text segment always starts at a fixed address.
        !           110:    This way we don't need to have a label _start defined.  */
        !           111: #define TEXT_START 0
        !           112: 
        !           113: #define VALBITS 26
        !           114: #define GCTYPEBITS 5
        !           115: 
        !           116: /* Taking a pointer to a char casting it as int pointer */
        !           117: /* and then taking the int which the int pointer points to */
        !           118: /* is practically guaranteed to give erroneous results */
        !           119: 
        !           120: #define NEED_ERRNO
        !           121: 
        !           122: #define SKTPAIR
        !           123: 
        !           124: /* BSD has BSTRING.  */
        !           125: 
        !           126: #define BSTRING
        !           127: 
        !           128: /* Special switches to give the C compiler.  */
        !           129: 
        !           130: #define C_SWITCH_MACHINE -ma
        !           131: 
        !           132: /* Don't attempt to relabel some of the data as text when dumping.
        !           133:    It does not work because their virtual addresses are not consecutive.
        !           134:    This enables us to use the standard crt0.o.  */
        !           135: 
        !           136: #define NO_REMAP
        !           137: 
        !           138: /* Turn off some `register' declarations.  */
        !           139: 
        !           140: #define RTPC_REGISTER_BUG
        !           141: 
        !           142: /* (short) negative-int doesn't sign-extend correctly */
        !           143: #define SHORT_CAST_BUG

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