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Annotation of 40BSD/cmd/as/as.h, revision 1.1

1.1     ! root        1: /* Copyright (c) 1980 Regents of the University of California */
        !             2: /* "@(#)as.h 4.8 11/5/80" */
        !             3: #ifdef VMS
        !             4: # define       vax     1
        !             5: # define       VAX     1
        !             6: #endif VMS
        !             7: 
        !             8: #include <sys/types.h>
        !             9: #ifdef UNIX
        !            10: 
        !            11: #ifdef FLEXNAMES
        !            12: #  include <a.out.h>
        !            13: #  include <stab.h>
        !            14: #else not FLEXNAMES
        !            15: #  define ONLIST
        !            16: #  include "a.out.h"
        !            17: #  include <stab.h>
        !            18: #endif FLEXNAMES
        !            19: 
        !            20: #endif UNIX 
        !            21: #ifdef VMS
        !            22: 
        !            23: #ifdef UNIXDEVEL
        !            24: #  include <a.out.h>
        !            25: #else not UNIXDEVEL
        !            26: #  include <aout.h>
        !            27: #endif not UNIXDEVEL
        !            28: 
        !            29: #endif VMS
        !            30: 
        !            31: #define readonly
        !            32: #define        NINST           300
        !            33: 
        !            34: #define        NEXP            20      /* max number of expr. terms per instruction */
        !            35: #define        NARG            6       /* max number of args per instruction */
        !            36: #define        NHASH           1103    /* hash table is dynamically extended */
        !            37: #define        TNAMESIZE       32      /* maximum length of temporary file names */
        !            38: #define        NLOC            4       /* number of location ctrs */
        !            39: 
        !            40: #ifdef UNIX
        !            41: # ifndef       FLEXNAMES
        !            42: #      ifndef  NCPS
        !            43: #              define  NCPS    8       /* number of characters per symbol*/
        !            44: #      endif
        !            45: # else
        !            46: #      ifdef NCPS
        !            47: #              undef   NCPS
        !            48: #      endif
        !            49: #      define  NCPS    BUFSIZ  /* needed to allocate yytext */
        !            50: # endif
        !            51: # endif UNIX
        !            52: 
        !            53: # ifdef VMS
        !            54: # ifdef NCPS
        !            55: #      undef   NCPS
        !            56: # endif NCPS
        !            57: #      define  NCPS    15
        !            58: # endif VMS
        !            59: 
        !            60: /*
        !            61:  * Symbol types
        !            62:  */
        !            63: #define        XUNDEF  0x0
        !            64: #define        XABS    0x2
        !            65: #define        XTEXT   0x4
        !            66: #define        XDATA   0x6
        !            67: #define        XBSS    0x8
        !            68: 
        !            69: #define        XXTRN   0x1
        !            70: #define        XTYPE   0x1E
        !            71: 
        !            72: #define        XFORW   0x20    /* Was forward-referenced when undefined */
        !            73: 
        !            74: #define        ERR     (-1)
        !            75: #define        NBPW    32      /* Bits per word */
        !            76: 
        !            77: #define        AMASK   017
        !            78: 
        !            79: /*
        !            80:  * Actual argument syntax types
        !            81:  */
        !            82: #define        AREG    1       /* %r */
        !            83: #define        ABASE   2       /* (%r) */
        !            84: #define        ADECR   3       /* -(%r) */
        !            85: #define        AINCR   4       /* (%r)+ */
        !            86: #define        ADISP   5       /* expr(%r) */
        !            87: #define        AEXP    6       /* expr */
        !            88: #define        AIMM    7       /* $ expr */
        !            89: #define        ASTAR   8       /* * */
        !            90: #define        AINDX   16      /* [%r] */
        !            91: 
        !            92: /*
        !            93:  * Argument access types used to test validity of operands to operators
        !            94:  */
        !            95: #define        ACCR    (1<<3)                          /* read */
        !            96: #define        ACCW    (2<<3)                          /* write */
        !            97: #define        ACCB    (4<<3)                          /* branch displacement */
        !            98: #define        ACCA    (8<<3)                          /* address only */
        !            99: #define        ACCM    (ACCR | ACCW)                   /* modify */
        !           100: #define        ACCI    (ACCB | ACCR)                   /* XFC code */
        !           101: 
        !           102: #define ACCESSMASK     (ACCA | ACCR | ACCW | ACCB)     /* the mask */
        !           103: 
        !           104: /*
        !           105:  *     Argument data types
        !           106:  *     Also used to tell outrel what it is relocating
        !           107:  *     (possibly in combination with RELOC_PCREL and TYPNONE)
        !           108:  */
        !           109: #define        TYPB            0       /* byte */
        !           110: #define        TYPW            1       /* word */
        !           111: #define        TYPL            2       /* long */
        !           112: #define        TYPQ            3       /* quad */
        !           113: #define        TYPF            4       /* floating */
        !           114: #define        TYPD            5       /* double floating */
        !           115: #define        TYPNONE         6       /* when nothing */
        !           116: #define        RELOC_PCREL     8       /* implicit argument to outrel; ==> PCREL */
        !           117: 
        !           118: #define        TYPMASK 7
        !           119: 
        !           120: /*
        !           121:  *     reference types for loader
        !           122:  */
        !           123: #define        PCREL   1
        !           124: #define        LEN1    2
        !           125: #define        LEN2    4
        !           126: #define        LEN4    6
        !           127: #define        LEN8    8
        !           128: 
        !           129: extern int     reflen[];       /* {LEN*+PCREL} ==> number of bytes */
        !           130: extern int     lgreflen[];     /* {LEN*+PCREL} ==> lg number of bytes */
        !           131: extern int     len124[];       /* {1,2,4,8} ==> {LEN1, LEN2, LEN4, LEN8} */
        !           132: extern char    mod124[];       /* {1,2,4,8} ==> {bits to construct operands */
        !           133: extern int     type_124[];     /* {1,2,4,8} ==> {TYPB, TYPW, TYPL, TYPQ} */
        !           134: extern int     ty_NORELOC[];   /* {TYPB..TYPD} ==> {1 if relocation not OK */
        !           135: extern int     ty_LEN[];       /* {TYPB..TYPD} ==> {LEN1..LEN8} */
        !           136: extern int     ty_nbyte[];     /* {TYPB..TYPD} ==> {1,2,4,8} */
        !           137: extern int     ty_nlg[];       /* {TYPB..TYPD} ==> lg{1,2,4,8} */
        !           138: 
        !           139: #define        TMPC    7       
        !           140: #define        HW      01
        !           141: #define        FW      03
        !           142: #define        DW      07
        !           143: 
        !           144: #ifdef UNIX
        !           145: #  include <pagsiz.h>
        !           146: #endif UNIX
        !           147: 
        !           148: #ifdef VMS
        !           149: #  define PAGRND       0x1FFL
        !           150: #endif VMS
        !           151: 
        !           152: #define        round(x,y)      (((x)+(y)) & ~(y))
        !           153: 
        !           154: #define        STABTYPS        0340
        !           155: #define        STABFLAG        0200
        !           156: 
        !           157: /*
        !           158:  *     Follows are the definitions for the symbol table tags, which are
        !           159:  *     all unsigned characters..
        !           160:  *     High value tags are generated by the asembler for internal
        !           161:  *     use.
        !           162:  *     Low valued tags are the parser coded tokens the scanner returns.
        !           163:  *     There are several pertinant bounds in this ordering:
        !           164:  *             a)      Symbols greater than JXQUESTIONABLE
        !           165:  *                     are used by the jxxx bumper, indicating that
        !           166:  *                     the symbol table entry is a jxxx entry
        !           167:  *                     that has yet to be bumped.
        !           168:  *             b)      Symbols greater than IGNOREBOUND are not
        !           169:  *                     bequeathed to the loader; they are truly
        !           170:  *                     for assembler internal use only.
        !           171:  *             c)      Symbols greater than OKTOBUMP represent
        !           172:  *                     indices into the program text that should
        !           173:  *                     be changed in preceeding jumps or aligns
        !           174:  *                     must get turned into their long form.
        !           175:  */
        !           176: 
        !           177: #define        TAGMASK         0xFF
        !           178: 
        !           179: #      define  JXACTIVE        0xFF    /*jxxx size unknown*/
        !           180: #      define  JXNOTYET        0xFE    /*jxxx size known, but not yet expanded*/
        !           181: #      define  JXALIGN         0xFD    /*align jxxx entry*/
        !           182: #      define  JXINACTIVE      0xFC    /*jxxx size known and expanded*/
        !           183: 
        !           184: #define        JXQUESTIONABLE          0xFB
        !           185: 
        !           186: #      define  JXTUNNEL        0xFA    /*jxxx that jumps to another*/
        !           187: #      define  OBSOLETE        0xF9    /*erroneously entered symbol*/
        !           188: 
        !           189: #define        IGNOREBOUND     0xF8            /*symbols greater than this are ignored*/
        !           190: #      define  STABFLOATING    0xF7
        !           191: #      define  LABELID         0xF6
        !           192: 
        !           193: #define        OKTOBUMP        0xF5
        !           194: #      define  STABFIXED       0xF4
        !           195: 
        !           196: /*
        !           197:  *     astoks.h contains reserved word codings the parser should
        !           198:  *     know about
        !           199:  */
        !           200: #include "astoks.h"
        !           201: 
        !           202: /*
        !           203:  *     The structure for one symbol table entry.
        !           204:  *     Symbol table entries are used for both user defined symbols,
        !           205:  *     and symbol slots generated to create the jxxx jump from
        !           206:  *     slots.
        !           207:  *     Caution: the instructions are stored in a shorter version
        !           208:  *     of the struct symtab, using all fields in sym_nm and
        !           209:  *     tag.  The fields used in sym_nm are carefully redeclared
        !           210:  *     in struct Instab and struct instab (see below).
        !           211:  *     If struct nlist gets changed, then Instab and instab may
        !           212:  *     have to be changed.
        !           213:  */
        !           214: 
        !           215: struct symtab{
        !           216:                struct  nlist   s_nm;
        !           217:                u_char  s_tag;          /* assembler tag */
        !           218:                u_char  s_ptype;        /* if tag == NAME */
        !           219:                u_char  s_jxoveralign;  /* if a JXXX, jumped over align */
        !           220:                short   s_index;        /* which segment */
        !           221:                struct  symtab *s_dest; /* if JXXX, where going to */
        !           222: #ifdef DJXXX
        !           223:                short   s_jxline;       /* source line of the jump from */
        !           224: #endif
        !           225: };
        !           226: /*
        !           227:  *     Redefinitions of the fields in symtab for
        !           228:  *     use when the symbol table entry marks a jxxx instruction.
        !           229:  */
        !           230: #define        s_jxbump        s_ptype         /* tag == JX..., how far to expand */
        !           231: #define        s_jxfear        s_desc          /* how far needs to be bumped */
        !           232: /*
        !           233:  *     Redefinitions of fields in the struct nlist for symbols so that
        !           234:  *     one saves typing, and so that they conform 
        !           235:  *     with the old naming conventions.
        !           236:  */
        !           237: #ifdef FLEXNAMES
        !           238: #define        s_name  s_nm.n_un.n_name        /* name pointer */
        !           239: #define        s_nmx   s_nm.n_un.n_strx        /* string table index */
        !           240: #else  not FLEXNAMES
        !           241: #define        s_name  s_nm.n_name
        !           242: #endif
        !           243: #define        s_type  s_nm.n_type             /* type of the symbol */
        !           244: #define        s_other s_nm.n_other            /* other information for sdb */
        !           245: #define        s_desc  s_nm.n_desc             /* type descriptor */
        !           246: #define        s_value s_nm.n_value            /* value of the symbol, or sdb delta */
        !           247: 
        !           248: struct instab{
        !           249:        struct  nlist   s_nm;           /* instruction name, type (opcode) */
        !           250:        u_char  s_tag;                  
        !           251:        char    s_pad[3];               /* round to 20 bytes */
        !           252: };
        !           253: /*
        !           254:  *     The fields nm.n_desc and nm.n_value total 6 bytes; this is
        !           255:  *     just enough for the 6 bytes describing the argument types.
        !           256:  *     We use a macro to define access to these 6 bytes, assuming that
        !           257:  *     they are allocated adjacently.
        !           258:  *     IF THE FORMAT OF STRUCT nlist CHANGES, THESE MAY HAVE TO BE CHANGED.
        !           259:  *
        !           260:  *     Instab is cleverly declared to look very much like the combination of
        !           261:  *     a struct symtab and a struct nlist.
        !           262:  */
        !           263: struct Instab{
        !           264: #ifdef FLEXNAMES
        !           265:        char    *I_name;
        !           266: #else not FLEXNAMES
        !           267:        char    I_name[NCPS];
        !           268: #endif
        !           269:        u_char  I_opcode;
        !           270:        char    I_nargs;
        !           271:        char    I_args[6];
        !           272:        u_char  I_s_tag;
        !           273:        char    I_pad[3];               /* round to 20 bytes */
        !           274: };
        !           275: /*
        !           276:  *     Redefinitions of fields in the struct nlist for instructions so that
        !           277:  *     one saves typing, and conforms to the old naming conventions
        !           278:  */
        !           279: #define        i_opcode        s_nm.n_type     /* use the same field as symtab.type */
        !           280: #define        i_nargs         s_nm.n_other    /* number of arguments */
        !           281: #define        fetcharg(ptr, n) ((struct Instab *)ptr)->I_args[n]
        !           282: 
        !           283: struct arg {                           /*one argument to an instruction*/
        !           284:        char    a_atype;
        !           285:        char    a_areg1;
        !           286:        char    a_areg2;
        !           287:        char    a_dispsize;             /*usually d124, unless have B^, etc*/
        !           288:        struct  exp *a_xp;
        !           289: };
        !           290: 
        !           291: struct exp {
        !           292:        long    e_xvalue;               /* MUST be the first field (look at union Double) */
        !           293:        long    e_yvalue;               /* MUST be second field; least sig word of a double */
        !           294:        char    e_xtype;
        !           295:        char    e_xloc;
        !           296:        struct  symtab *e_xname;
        !           297: };
        !           298: 
        !           299: #define doub_MSW e_xvalue
        !           300: #define doub_LSW e_yvalue
        !           301: 
        !           302: union  Double {
        !           303:        struct{
        !           304:                long    doub_MSW;
        !           305:                long    doub_LSW;
        !           306:        } dis_dvalue;
        !           307:        double  dvalue;
        !           308: };
        !           309: 
        !           310: struct Quad {
        !           311:        long    quad_low_long;
        !           312:        long    quad_high_long;
        !           313: };
        !           314: 
        !           315: /*
        !           316:  *     Magic layout macros
        !           317:  */
        !           318: #define        MINBYTE -128
        !           319: #define                MAXBYTE 127
        !           320: #define                MINWORD -32768
        !           321: #define                MAXWORD 32767
        !           322: 
        !           323: #define                LITFLTMASK 0x000043F0   /*really magic*/
        !           324: /*
        !           325:  *             Is the floating point double word in xp a
        !           326:  *             short literal floating point number?
        !           327:  */
        !           328: #define        slitflt(xp) \
        !           329:                        (    (xp->doub_LSW == 0) \
        !           330:                         &&  ( (xp->doub_MSW & LITFLTMASK) \
        !           331:                              == xp->doub_MSW) )
        !           332: /*
        !           333:  *     If it is a slitflt, then extract the 6 interesting bits
        !           334:  */
        !           335: #define                extlitflt(xp) \
        !           336:                        xp->doub_MSW >> 4
        !           337: 
        !           338:        extern  struct  arg     arglist[NARG];  /*building operands in instructions*/
        !           339:        extern  struct  exp     explist[NEXP];  /*building up a list of expressions*/
        !           340:        extern  struct  exp     *xp;            /*current free expression*/
        !           341:        /*
        !           342:         *      Communication between the scanner and the jxxx handlers.
        !           343:         *      lastnam:        the last name seen on the input
        !           344:         *      lastjxxx:       pointer to the last symbol table entry for
        !           345:         *                      a jump from
        !           346:         */
        !           347:        extern  struct  symtab  *lastnam;
        !           348:        extern  struct  symtab  *lastjxxx;      
        !           349: 
        !           350: #ifdef VMS
        !           351:        extern  char    *vms_obj_ptr;           /* object buffer pointer */
        !           352:        extern  char    sobuf[];                /* object buffer         */
        !           353:        extern  int     objfil;                 /* VMS object file descriptor */
        !           354: #endif VMS
        !           355: 
        !           356:        /*
        !           357:         *      Lgensym is used to make up funny names for local labels.
        !           358:         *      lgensym[i] is the current funny number to put after
        !           359:         *      references to if, lgensym[i]-1 is for ib.
        !           360:         *      genref[i] is set when the label is referenced before
        !           361:         *      it is defined (i.e. 2f) so that we can be sure these
        !           362:         *      labels are always defined to avoid weird diagnostics
        !           363:         *      from the loader later.
        !           364:         */
        !           365:        extern  int     lgensym[10];
        !           366:        extern  char    genref[10];
        !           367: 
        !           368:        extern  char    tmpn1[TNAMESIZE];       /* Interpass temporary */
        !           369:        extern  struct  exp     *dotp;          /* the current dot location */
        !           370:        extern  int     loctr;
        !           371: 
        !           372:        extern  struct  exec    hdr;            /* a.out header */
        !           373:        extern  u_long  tsize;                  /* total text size */
        !           374:        extern  u_long  dsize;                  /* total data size */
        !           375:        extern  u_long  trsize;                 /* total text relocation size */
        !           376:        extern  u_long  drsize;                 /* total data relocation size */
        !           377:        extern  u_long  datbase;                /* base of the data segment */
        !           378:        /*
        !           379:         *      Bitoff and bitfield keep track of the packing into 
        !           380:         *      bytes mandated by the expression syntax <expr> ':' <expr>
        !           381:         */
        !           382:        extern  int     bitoff; 
        !           383:        extern  long    bitfield;
        !           384:        
        !           385:        /*
        !           386:         *      The lexical analyzer builds up symbols in yytext.  Lookup
        !           387:         *      expects its argument in this buffer
        !           388:         */
        !           389:        extern  char    yytext[NCPS+2];         /* text buffer for lexical */
        !           390:        /*
        !           391:         *      Variables to manage the input assembler source file
        !           392:         */
        !           393:        extern  int     lineno;                 /*the line number*/
        !           394:        extern  char    *dotsname;              /*the name of the as source*/
        !           395: 
        !           396:        extern  FILE    *tmpfil;                /* interpass communication*/
        !           397: 
        !           398:        extern  int     passno;                 /* 1 or 2 */
        !           399: 
        !           400:        extern  int     anyerrs;                /*errors assembling arguments*/
        !           401:        extern  int     silent;                 /*don't mention the errors*/
        !           402:        extern  int     savelabels;             /*save labels in a.out*/
        !           403:        extern  int     orgwarn;                /* questionable origin ? */
        !           404:        extern  int     useVM;                  /*use virtual memory temp file*/
        !           405:        extern  int     jxxxJUMP;               /*use jmp instead of brw for jxxx */
        !           406:        extern  int     readonlydata;           /*initialized data into text space*/
        !           407: #ifdef DEBUG
        !           408:        extern  int     debug;
        !           409:        extern  int     toktrace;
        !           410: #endif
        !           411:        /*
        !           412:         *      Information about the instructions
        !           413:         */
        !           414:        extern  struct  instab  *itab[NINST];   /*maps opcodes to instructions*/
        !           415:        extern  readonly struct Instab instab[];
        !           416: 
        !           417:        extern  int     curlen;                 /*current literal storage size*/
        !           418:        extern  int     d124;                   /*current pointer storage size*/
        !           419:        
        !           420:        struct  symtab  **lookup();             /*argument in yytext*/
        !           421:        struct  symtab  *symalloc();
        !           422: 
        !           423: #define outb(val) {dotp->e_xvalue++; if (passno==2) bputc((val), (txtfil));}
        !           424: 
        !           425: #define outs(cp, lg) dotp->e_xvalue += (lg); if (passno == 2) bwrite((cp), (lg), (txtfil))
        !           426: 
        !           427: /*
        !           428:  *     Most of the time, the argument to flushfield is a power of two constant,
        !           429:  *     the calculations involving it can be optimized to shifts.
        !           430:  */
        !           431: #define flushfield(n) if (bitoff != 0)  Flushfield( ( (bitoff+n-1) /n ) * n)
        !           432: 
        !           433: /*
        !           434:  * The biobuf structure and associated routines are used to write
        !           435:  * into one file at several places concurrently.  Calling bopen
        !           436:  * with a biobuf structure sets it up to write ``biofd'' starting
        !           437:  * at the specified offset.  You can then use ``bwrite'' and/or ``bputc''
        !           438:  * to stuff characters in the stream, much like ``fwrite'' and ``fputc''.
        !           439:  * Calling bflush drains all the buffers and MUST be done before exit.
        !           440:  */
        !           441: struct biobuf {
        !           442:        short   b_nleft;                /* Number free spaces left in b_buf */
        !           443: /* Initialize to be less than BUFSIZ initially, to boundary align in file */
        !           444:        char    *b_ptr;                 /* Next place to stuff characters */
        !           445:        char    b_buf[BUFSIZ];          /* The buffer itself */
        !           446:        off_t   b_off;                  /* Current file offset */
        !           447:        struct  biobuf *b_link;         /* Link in chain for bflush() */
        !           448: };
        !           449: #define        bputc(c,b) ((b)->b_nleft ? (--(b)->b_nleft, *(b)->b_ptr++ = (c)) \
        !           450:                       : bflushc(b, c))
        !           451: #define BFILE  struct biobuf
        !           452: 
        !           453:        extern  BFILE   *biobufs;       /* head of the block I/O buffer chain */
        !           454:        extern  int     biofd;          /* file descriptor for block I/O file */
        !           455:        extern  off_t   boffset;        /* physical position in logical file */
        !           456: 
        !           457:        /*
        !           458:         *      For each of the named .text .data segments
        !           459:         *      (introduced by .text <expr>), we maintain
        !           460:         *      the current value of the dot, and the BFILE where
        !           461:         *      the information for each of the segments is placed
        !           462:         *      during the second pass.
        !           463:         */
        !           464:        extern  struct  exp     usedot[NLOC + NLOC];
        !           465:        extern          BFILE   *usefile[NLOC + NLOC];
        !           466:        extern          BFILE   *txtfil;/* file for text and data: into usefile */
        !           467:        /*
        !           468:         *      Relocation information for each segment is accumulated
        !           469:         *      seperately from the others.  Writing the relocation
        !           470:         *      information is logically viewed as writing to one
        !           471:         *      relocation saving file for  each segment; physically
        !           472:         *      we have a bunch of buffers allocated internally that
        !           473:         *      contain the relocation information.
        !           474:         */
        !           475:        struct  relbufdesc      *rusefile[NLOC + NLOC];
        !           476:        struct  relbufdesc      *relfil;

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