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Annotation of 43BSD/bin/as/as.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1982 Regents of the University of California.
        !             3:  * All rights reserved.  The Berkeley software License Agreement
        !             4:  * specifies the terms and conditions for redistribution.
        !             5:  *
        !             6:  *     @(#)as.h        5.3 (Berkeley) 7/6/85
        !             7:  */
        !             8: 
        !             9: #define        reg     register
        !            10: 
        !            11: #include <sys/types.h>
        !            12: #include <a.out.h>
        !            13: #include <stab.h>
        !            14: 
        !            15: #define readonly
        !            16: #define        NINST           300
        !            17: 
        !            18: #define        NEXP            20      /* max number of expr. terms per instruction */
        !            19: #define        NARG            6       /* max number of args per instruction */
        !            20: #define        NHASH           1103    /* hash table is dynamically extended */
        !            21: #define        TNAMESIZE       256     /* maximum length of temporary file names */
        !            22: #define        NLOC            4       /* number of location ctrs */
        !            23: /*
        !            24:  *     Sizes for character buffers.
        !            25:  *     what                    size #define name       comments
        !            26:  *
        !            27:  *     name assembly           NCPName 
        !            28:  *     name save               STRPOOLDALLOP   
        !            29:  *
        !            30:  *     -name saving is a simple first fit
        !            31:  */
        !            32: #ifndef STRPOOLDALLOP
        !            33: #      define STRPOOLDALLOP    8192
        !            34: #endif not STRPOOLDALLOP
        !            35: 
        !            36: #define        NCPName NCPS
        !            37: #ifndef NCPS
        !            38: #      undef   NCPName
        !            39: #      define  NCPName 4096
        !            40: #endif not NCPS
        !            41: /*
        !            42:  *     Check sizes, and compiler error if sizes botch
        !            43:  */
        !            44: #if STRPOOLDALLOP < NCPName
        !            45:        $$$botch with definition sizes
        !            46: #endif test botches
        !            47: /*
        !            48:  * Symbol types
        !            49:  */
        !            50: #define        XUNDEF  0x0
        !            51: #define        XABS    0x2
        !            52: #define        XTEXT   0x4
        !            53: #define        XDATA   0x6
        !            54: #define        XBSS    0x8
        !            55: 
        !            56: #define        XXTRN   0x1
        !            57: #define        XTYPE   0x1E
        !            58: 
        !            59: #define        XFORW   0x20    /* Was forward-referenced when undefined */
        !            60: 
        !            61: #define        ERR     (-1)
        !            62: #define        NBWD    32      /* Bits per word */
        !            63: 
        !            64: #define        AMASK   017
        !            65: 
        !            66: /*
        !            67:  * Actual argument syntax types
        !            68:  */
        !            69: #define        AREG    1       /* %r */
        !            70: #define        ABASE   2       /* (%r) */
        !            71: #define        ADECR   3       /* -(%r) */
        !            72: #define        AINCR   4       /* (%r)+ */
        !            73: #define        ADISP   5       /* expr(%r) */
        !            74: #define        AEXP    6       /* expr */
        !            75: #define        AIMM    7       /* $ expr */
        !            76: #define        ASTAR   8       /* * */
        !            77: #define        AINDX   16      /* [%r] */
        !            78: /*
        !            79:  *     Definitions for the things found in ``instrs''
        !            80:  */
        !            81: #define        INSTTAB 1
        !            82: #include "instrs.h"
        !            83: 
        !            84: /*
        !            85:  *     Tells outrel what it is relocating
        !            86:  *     RELOC_PCREL is an implicit argument to outrel; it is or'ed in
        !            87:  *     with a TYPX
        !            88:  */
        !            89: #define        RELOC_PCREL     (1<<TYPLG)
        !            90: /*
        !            91:  *     reference types for loader
        !            92:  */
        !            93: #define        PCREL   1
        !            94: #define        LEN1    2
        !            95: #define        LEN2    4
        !            96: #define        LEN4    6
        !            97: #define        LEN8    8
        !            98: #define        LEN16   10
        !            99: 
        !           100: extern int     reflen[];       /* {LEN*+PCREL} ==> number of bytes */
        !           101: extern int     lgreflen[];     /* {LEN*+PCREL} ==> lg number of bytes */
        !           102: extern int     len124[];       /* {1,2,4,8,16} ==> {LEN1, LEN2, LEN4, LEN8} */
        !           103: extern char    mod124[];       /* {1,2,4,8,16} ==> {bits to construct operands */
        !           104: extern int     type_124[];     /* {1,2,4,8,16} ==> {TYPB,TYPW,TYPL,TYPQ,TYPO} */
        !           105: extern int     ty_NORELOC[];   /* {TYPB..TYPH} ==> {1 if relocation not OK */
        !           106: extern int     ty_float[];     /* {TYPB..TYPH} ==> {1 if floating number */
        !           107: extern int     ty_LEN[];       /* {TYPB..TYPH} ==> {LEN1..LEN16} */
        !           108: extern int     ty_nbyte[];     /* {TYPB..TYPH} ==> {1,2,4,8,16} */
        !           109: extern int     ty_nlg[];       /* {TYPB..TYPH} ==> lg{1,2,4,8,16} */
        !           110: extern char    *ty_string[];   /* {TYPB..TYPH} ==> printable */
        !           111: 
        !           112: #define        TMPC    7       
        !           113: #define        HW      0x1
        !           114: #define        FW      0x3
        !           115: #define        DW      0x7
        !           116: #define        OW      0xF
        !           117: 
        !           118: #define        round(x,y)      (((x)+(y)) & ~(y))
        !           119: 
        !           120: #define        STABTYPS        0340
        !           121: #define        STABFLAG        0200
        !           122: 
        !           123: /*
        !           124:  *     Follows are the definitions for the symbol table tags, which are
        !           125:  *     all unsigned characters..
        !           126:  *     High value tags are generated by the asembler for internal
        !           127:  *     use.
        !           128:  *     Low valued tags are the parser coded tokens the scanner returns.
        !           129:  *     There are several pertinant bounds in this ordering:
        !           130:  *             a)      Symbols greater than JXQUESTIONABLE
        !           131:  *                     are used by the jxxx bumper, indicating that
        !           132:  *                     the symbol table entry is a jxxx entry
        !           133:  *                     that has yet to be bumped.
        !           134:  *             b)      Symbols greater than IGNOREBOUND are not
        !           135:  *                     bequeathed to the loader; they are truly
        !           136:  *                     for assembler internal use only.
        !           137:  *             c)      Symbols greater than OKTOBUMP represent
        !           138:  *                     indices into the program text that should
        !           139:  *                     be changed in preceeding jumps or aligns
        !           140:  *                     must get turned into their long form.
        !           141:  */
        !           142: 
        !           143: #define        TAGMASK         0xFF
        !           144: 
        !           145: #      define  JXACTIVE        0xFF    /*jxxx size unknown*/
        !           146: #      define  JXNOTYET        0xFE    /*jxxx size known, but not yet expanded*/
        !           147: #      define  JXALIGN         0xFD    /*align jxxx entry*/
        !           148: #      define  JXINACTIVE      0xFC    /*jxxx size known and expanded*/
        !           149: 
        !           150: #define        JXQUESTIONABLE          0xFB
        !           151: 
        !           152: #      define  JXTUNNEL        0xFA    /*jxxx that jumps to another*/
        !           153: #      define  OBSOLETE        0xF9    /*erroneously entered symbol*/
        !           154: 
        !           155: #define        IGNOREBOUND     0xF8            /*symbols greater than this are ignored*/
        !           156: #      define  STABFLOATING    0xF7
        !           157: #      define  LABELID         0xF6
        !           158: 
        !           159: #define        OKTOBUMP        0xF5
        !           160: #      define  STABFIXED       0xF4
        !           161: 
        !           162: /*
        !           163:  *     astoks.h contains reserved word codings the parser should
        !           164:  *     know about
        !           165:  */
        !           166: #include "astoks.h"
        !           167: 
        !           168: /*
        !           169:  *     The structure for one symbol table entry.
        !           170:  *     Symbol table entries are used for both user defined symbols,
        !           171:  *     and symbol slots generated to create the jxxx jump from
        !           172:  *     slots.
        !           173:  *     Caution: the instructions are stored in a shorter version
        !           174:  *     of the struct symtab, using all fields in sym_nm and
        !           175:  *     tag.  The fields used in sym_nm are carefully redeclared
        !           176:  *     in struct Instab and struct instab (see below).
        !           177:  *     If struct nlist gets changed, then Instab and instab may
        !           178:  *     have to be changed.
        !           179:  */
        !           180: 
        !           181: struct symtab{
        !           182:                struct  nlist   s_nm;
        !           183:                u_char  s_tag;          /* assembler tag */
        !           184:                u_char  s_ptype;        /* if tag == NAME */
        !           185:                u_char  s_jxoveralign;  /* if a JXXX, jumped over align */
        !           186:                short   s_index;        /* which segment */
        !           187:                struct  symtab *s_dest; /* if JXXX, where going to */
        !           188: #ifdef DEBUG
        !           189:                short   s_jxline;       /* source line of the jump from */
        !           190: #endif
        !           191: };
        !           192: /*
        !           193:  *     Redefinitions of the fields in symtab for
        !           194:  *     use when the symbol table entry marks a jxxx instruction.
        !           195:  */
        !           196: #define        s_jxbump        s_ptype         /* tag == JX..., how far to expand */
        !           197: #define        s_jxfear        s_desc          /* how far needs to be bumped */
        !           198: /*
        !           199:  *     Redefinitions of fields in the struct nlist for symbols so that
        !           200:  *     one saves typing, and so that they conform 
        !           201:  *     with the old naming conventions.
        !           202:  */
        !           203: #define        s_name  s_nm.n_un.n_name
        !           204: #define        i_name  s_name
        !           205: #define        FETCHNAME(sp)   (((struct strdesc *)(sp)->s_name)->sd_string)
        !           206: #define        STRLEN(sp)      (((struct strdesc *)(sp)->s_name)->sd_strlen)
        !           207: #define        STROFF(sp)      (((struct strdesc *)(sp)->s_name)->sd_stroff)
        !           208: #define        STRPLACE(sp)    (((struct strdesc *)(sp)->s_name)->sd_place)
        !           209: #define        s_nmx   s_nm.n_un.n_strx        /* string table index */
        !           210: #define        s_type  s_nm.n_type             /* type of the symbol */
        !           211: #define        s_other s_nm.n_other            /* other information for sdb */
        !           212: #define        s_desc  s_nm.n_desc             /* type descriptor */
        !           213: #define        s_value s_nm.n_value            /* value of the symbol, or sdb delta */
        !           214: 
        !           215: struct instab{
        !           216:        struct  nlist   s_nm;           /* instruction name, type (opcode) */
        !           217:        u_char  s_tag;                  
        !           218:        u_char  s_eopcode;
        !           219:        char    s_pad[2];               /* round to 20 bytes */
        !           220: };
        !           221: typedef        struct  instab  *Iptr;
        !           222: /*
        !           223:  *     The fields nm.n_desc and nm.n_value total 6 bytes; this is
        !           224:  *     just enough for the 6 bytes describing the argument types.
        !           225:  *     We use a macro to define access to these 6 bytes, assuming that
        !           226:  *     they are allocated adjacently.
        !           227:  *     IF THE FORMAT OF STRUCT nlist CHANGES, THESE MAY HAVE TO BE CHANGED.
        !           228:  *
        !           229:  *     Instab is cleverly declared to look very much like the combination of
        !           230:  *     a struct symtab and a struct nlist.
        !           231:  */
        !           232: /*
        !           233:  *     With the 1981 VAX architecture reference manual,
        !           234:  *     DEC defined and named two byte opcodes. 
        !           235:  *     In addition, DEC defined four new one byte instructions for
        !           236:  *     queue manipulation.
        !           237:  *     The assembler was patched in 1982 to reflect this change.
        !           238:  *
        !           239:  *     The two byte opcodes are preceded with an escape byte
        !           240:  *     (usually an ESCD) and an opcode byte.
        !           241:  *     For one byte opcodes, the opcode is called the primary opcode.
        !           242:  *     For two byte opcodes, the second opcode is called the primary opcode.
        !           243:  *
        !           244:  *     We store the primary opcode in I_popcode,
        !           245:  *     and the escape opcode in I_eopcode.
        !           246:  *
        !           247:  *     For one byte opcodes in the basic arhitecture,
        !           248:  *             I_eopcode is CORE
        !           249:  *     For one byte opcodes in the new architecture definition,
        !           250:  *             I_eopcode is NEW
        !           251:  *     For the two byte opcodes, I_eopcode is the escape byte.
        !           252:  *
        !           253:  *     The assembler checks if a NEW or two byte opcode is used,
        !           254:  *     and issues a warning diagnostic.
        !           255:  */
        !           256: /*
        !           257:  *     For upward compatability reasons, we can't have the two opcodes
        !           258:  *     forming an operator specifier byte(s) be physically adjacent
        !           259:  *     in the instruction table.
        !           260:  *     We define a structure and a constructor that is used in
        !           261:  *     the instruction generator.
        !           262:  */
        !           263: struct Opcode{
        !           264:        u_char  Op_eopcode;
        !           265:        u_char  Op_popcode;
        !           266: };
        !           267: 
        !           268: #define        BADPOINT        0xAAAAAAAA
        !           269: /*
        !           270:  *     See if a structured opcode is bad
        !           271:  */
        !           272: #define        ITABCHECK(o)    ((itab[o.Op_eopcode] != (Iptr*)BADPOINT) && (itab[o.Op_eopcode][o.Op_popcode] != (Iptr)BADPOINT))
        !           273: /*
        !           274:  *     Index the itab by a structured opcode
        !           275:  */
        !           276: #define        ITABFETCH(o)    itab[o.Op_eopcode][o.Op_popcode]
        !           277: 
        !           278: struct Instab{
        !           279:        char    *I_name;
        !           280:        u_char  I_popcode;              /* basic op code */
        !           281:        char    I_nargs;
        !           282:        char    I_args[6];
        !           283:        u_char  I_s_tag;
        !           284:        u_char  I_eopcode;
        !           285:        char    I_pad[2];               /* round to 20 bytes */
        !           286: };
        !           287: /*
        !           288:  *     Redefinitions of fields in the struct nlist for instructions so that
        !           289:  *     one saves typing, and conforms to the old naming conventions
        !           290:  */
        !           291: #define        i_popcode       s_nm.n_type     /* use the same field as symtab.type */
        !           292: #define        i_eopcode       s_eopcode
        !           293: #define        i_nargs         s_nm.n_other    /* number of arguments */
        !           294: #define        fetcharg(ptr, n) ((struct Instab *)ptr)->I_args[n]
        !           295: 
        !           296: struct arg {                           /*one argument to an instruction*/
        !           297:        char    a_atype;
        !           298:        char    a_areg1;
        !           299:        char    a_areg2;
        !           300:        char    a_dispsize;             /*usually d124, unless have B^, etc*/
        !           301:        struct  exp *a_xp;
        !           302: };
        !           303: /*
        !           304:  *     Definitions for numbers and expressions.
        !           305:  */
        !           306: #include "asnumber.h"
        !           307: struct exp {
        !           308:        Bignum  e_number;       /* 128 bits of #, plus tag */
        !           309:        char    e_xtype;
        !           310:        char    e_xloc;
        !           311:        struct  symtab          *e_xname;
        !           312: };
        !           313: #define        e_xvalue        e_number.num_num.numIl_int.Il_long
        !           314: 
        !           315: #define                MINLIT          0
        !           316: #define                MAXLIT          63
        !           317: 
        !           318: #define                MINBYTE         -128
        !           319: #define                MAXBYTE         127
        !           320: #define                MINUBYTE        0
        !           321: #define                MAXUBYTE        255
        !           322: 
        !           323: #define                MINWORD         -32768
        !           324: #define                MAXWORD         32767
        !           325: #define                MINUWORD        0
        !           326: #define                MAXUWORD        65535
        !           327: 
        !           328: #define                ISLIT(x)        (((x) >= MINLIT) && ((x) <= MAXLIT))
        !           329: #define                ISBYTE(x)       (((x) >= MINBYTE) && ((x) <= MAXBYTE))
        !           330: #define                ISUBYTE(x)      (((x) >= MINUBYTE) && ((x) <= MAXUBYTE))
        !           331: #define                ISWORD(x)       (((x) >= MINWORD) && ((x) <= MAXWORD))
        !           332: #define                ISUWORD(x)      (((x) >= MINUWORD) && ((x) <= MAXUWORD))
        !           333: /*
        !           334:  *     Definitions for strings.
        !           335:  *
        !           336:  *     Strings are stored in the string pool; see strsave(str, length)
        !           337:  *     Strings are known by their length and values.
        !           338:  *     A string pointer points to the beginning of the value bytes;
        !           339:  *
        !           340:  *     If this structure is changed, change insts also.
        !           341:  */
        !           342: struct strdesc{
        !           343:        int     sd_stroff;      /* offset into string file */
        !           344:        short   sd_place;       /* where string is */
        !           345:        u_short sd_strlen;      /* string length */
        !           346:        char    sd_string[1];   /* the string itself, flexible length */
        !           347: };
        !           348: /*
        !           349:  *     Where a string can be.  If these are changed, also change instrs.
        !           350:  */
        !           351: #define        STR_FILE        0x1
        !           352: #define        STR_CORE        0x2
        !           353: #define        STR_BOTH        0x3
        !           354: 
        !           355: struct strdesc *savestr();
        !           356: 
        !           357: /*
        !           358:  *     Global variables
        !           359:  */
        !           360:        extern  struct  arg     arglist[NARG];  /*building operands in instructions*/
        !           361:        extern  struct  exp     explist[NEXP];  /*building up a list of expressions*/
        !           362:        extern  struct  exp     *xp;            /*current free expression*/
        !           363:        /*
        !           364:         *      Communication between the scanner and the jxxx handlers.
        !           365:         *      lastnam:        the last name seen on the input
        !           366:         *      lastjxxx:       pointer to the last symbol table entry for
        !           367:         *                      a jump from
        !           368:         */
        !           369:        extern  struct  symtab  *lastnam;
        !           370:        extern  struct  symtab  *lastjxxx;      
        !           371:        /*
        !           372:         *      Lgensym is used to make up funny names for local labels.
        !           373:         *      lgensym[i] is the current funny number to put after
        !           374:         *      references to if, lgensym[i]-1 is for ib.
        !           375:         *      genref[i] is set when the label is referenced before
        !           376:         *      it is defined (i.e. 2f) so that we can be sure these
        !           377:         *      labels are always defined to avoid weird diagnostics
        !           378:         *      from the loader later.
        !           379:         */
        !           380:        extern  int     lgensym[10];
        !           381:        extern  char    genref[10];
        !           382: 
        !           383:        extern  struct  exp     *dotp;          /* the current dot location */
        !           384:        extern  int     loctr;
        !           385: 
        !           386:        extern  struct  exec    hdr;            /* a.out header */
        !           387:        extern  u_long  tsize;                  /* total text size */
        !           388:        extern  u_long  dsize;                  /* total data size */
        !           389:        extern  u_long  trsize;                 /* total text relocation size */
        !           390:        extern  u_long  drsize;                 /* total data relocation size */
        !           391:        extern  u_long  datbase;                /* base of the data segment */
        !           392:        /*
        !           393:         *      Bitoff and bitfield keep track of the packing into 
        !           394:         *      bytes mandated by the expression syntax <expr> ':' <expr>
        !           395:         */
        !           396:        extern  int     bitoff; 
        !           397:        extern  long    bitfield;
        !           398:        
        !           399:        /*
        !           400:         *      The lexical analyzer builds up symbols in yytext.  Lookup
        !           401:         *      expects its argument in this buffer
        !           402:         */
        !           403:        extern  char    yytext[NCPName+2];      /* text buffer for lexical */
        !           404:        /*
        !           405:         *      Variables to manage the input assembler source file
        !           406:         */
        !           407:        extern  int     lineno;                 /*the line number*/
        !           408:        extern  char    *dotsname;              /*the name of the as source*/
        !           409: 
        !           410:        extern  FILE    *tokfile;               /* temp token communication*/
        !           411:        extern  FILE    *strfile;               /* temp string file*/
        !           412:        extern  char    tokfilename[TNAMESIZE]; /* token file name */
        !           413:        extern  char    strfilename[TNAMESIZE]; /* string file name */
        !           414:        extern  int     strfilepos;             /* position in string file */
        !           415: 
        !           416:        extern  int     passno;                 /* 1 or 2 */
        !           417: 
        !           418:        extern  int     anyerrs;                /*errors as'ing arguments*/
        !           419:        extern  int     anywarnings;            /*warnings as'ing arguments*/
        !           420:        extern  int     silent;                 /*don't mention the errors*/
        !           421:        extern  int     savelabels;             /*save labels in a.out*/
        !           422:        extern  int     orgwarn;                /* questionable origin ? */
        !           423:        extern  int     useVM;                  /*use virtual memory temp file*/
        !           424:        extern  int     jxxxJUMP;               /*use jmp instead of brw for jxxx */
        !           425:        extern  int     readonlydata;           /*initialized data into text space*/
        !           426:        extern  int     nGHnumbers;             /* GH numbers used */
        !           427:        extern  int     nGHopcodes;             /* GH opcodes used */
        !           428:        extern  int     nnewopcodes;            /* new opcodes used */
        !           429: #ifdef DEBUG
        !           430:        extern  int     debug;
        !           431:        extern  int     toktrace;
        !           432: #endif
        !           433:        /*
        !           434:         *      Information about the instructions
        !           435:         */
        !           436:        extern  struct  instab  **itab[NINST];  /*maps opcodes to instructions*/
        !           437:        extern  readonly struct Instab instab[];
        !           438: 
        !           439:        extern  int     curlen;                 /*current literal storage size*/
        !           440:        extern  int     d124;                   /*current pointer storage size*/
        !           441:        extern  int     maxalign;               /*maximum .align allowed*/
        !           442:        
        !           443:        struct  symtab  **lookup();             /*argument in yytext*/
        !           444:        struct  symtab  *symalloc();
        !           445: 
        !           446:        char    *Calloc();
        !           447:        char    *ClearCalloc();
        !           448: 
        !           449: #define outb(val) {dotp->e_xvalue++; if (passno==2) bputc((val), (txtfil));}
        !           450: 
        !           451: #define outs(cp, lg) dotp->e_xvalue += (lg); if (passno == 2) bwrite((cp), (lg), (txtfil))
        !           452: 
        !           453: #define        Outb(o) outb(o)
        !           454: /*
        !           455:  *     Most of the time, the argument to flushfield is a power of two constant,
        !           456:  *     the calculations involving it can be optimized to shifts.
        !           457:  */
        !           458: #define flushfield(n) if (bitoff != 0)  Flushfield( ( (bitoff+n-1) /n ) * n)
        !           459: 
        !           460: /*
        !           461:  * The biobuf structure and associated routines are used to write
        !           462:  * into one file at several places concurrently.  Calling bopen
        !           463:  * with a biobuf structure sets it up to write ``biofd'' starting
        !           464:  * at the specified offset.  You can then use ``bwrite'' and/or ``bputc''
        !           465:  * to stuff characters in the stream, much like ``fwrite'' and ``fputc''.
        !           466:  * Calling bflush drains all the buffers and MUST be done before exit.
        !           467:  */
        !           468: struct biobuf {
        !           469:        short   b_nleft;                /* Number free spaces left in b_buf */
        !           470: /* Initialize to be less than BUFSIZ initially, to boundary align in file */
        !           471:        char    *b_ptr;                 /* Next place to stuff characters */
        !           472:        char    *b_buf;                 /* Pointer to the buffer */
        !           473:        off_t   b_off;                  /* Current file offset */
        !           474:        struct  biobuf *b_link;         /* Link in chain for bflush() */
        !           475: };
        !           476: #define        bputc(c,b) ((b)->b_nleft ? (--(b)->b_nleft, *(b)->b_ptr++ = (c)) \
        !           477:                       : bflushc(b, c))
        !           478: #define BFILE  struct biobuf
        !           479: 
        !           480:        extern  BFILE   *biobufs;       /* head of the block I/O buffer chain */
        !           481:        extern  int     biofd;          /* file descriptor for block I/O file */
        !           482:        extern  int     biobufsize;     /* optimal block size for I/O */
        !           483:        extern  off_t   boffset;        /* physical position in logical file */
        !           484: 
        !           485:        /*
        !           486:         *      For each of the named .text .data segments
        !           487:         *      (introduced by .text <expr>), we maintain
        !           488:         *      the current value of the dot, and the BFILE where
        !           489:         *      the information for each of the segments is placed
        !           490:         *      during the second pass.
        !           491:         */
        !           492:        extern  struct  exp     usedot[NLOC + NLOC];
        !           493:        extern          BFILE   *usefile[NLOC + NLOC];
        !           494:        extern          BFILE   *txtfil;/* file for text and data: into usefile */
        !           495:        /*
        !           496:         *      Relocation information for each segment is accumulated
        !           497:         *      seperately from the others.  Writing the relocation
        !           498:         *      information is logically viewed as writing to one
        !           499:         *      relocation saving file for  each segment; physically
        !           500:         *      we have a bunch of buffers allocated internally that
        !           501:         *      contain the relocation information.
        !           502:         */
        !           503:        struct  relbufdesc      *rusefile[NLOC + NLOC];
        !           504:        struct  relbufdesc      *relfil;

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