181 lines
3.7 KiB
C
181 lines
3.7 KiB
C
#define RCSID4 "$Header$"
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/*
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* (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
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* See the copyright notice in the ACK home directory, in the file "Copyright".
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*
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*/
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/*
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* Mostek 6500 parsing tables.
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*/
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/* From the READ_ME file - translation by Albert Koelmans:
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* ________________
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*
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* De .h en .l extensions van expressies zijn hard nodig.
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* Ze zorgen er echter ook voor dat er geen relocatable code geproduceerd
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* kan worden. Beschouw het volgende voorbeeld:
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*
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* The .h and .l extensions of expressions are vital. However, they prevent
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* relocatable code from being generated. Consider the following example:
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*
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* (file 1)
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* .sect .text ! 1
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* lda #[endbss].l ! 2
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* ldx #[endbss].h ! 3
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*
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* (file 2)
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* .sect .bss ! 4
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* endbss: ! 5
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*
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* Wat voor relocation struct moet er nu voor de instructie in regel 3
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* worden geproduceerd?
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*
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* What kind of relocation structure needs to be generated for the instruction
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* in line 3?
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*/
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expr
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: expr EXTENSION
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{ $$.val = ($1.val >> $2) & 0xFF;
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#ifdef RELOCATION
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$$.typ = combine($1.typ, S_ABS, '&');
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/* This will generate an 'invalid operator' */
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/* error if $1.typ is not absolute after pass 1. */
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#else
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$$.typ = $1.typ; /* Even if $1.typ is relocatable, it should be */
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/* absolute by the final pass. */
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#endif RELOCATION
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}
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;
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operation
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: NOPOP
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{ emit1($1); }
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| BITOP expr
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{ code($2,$1,$1+8); }
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| JMPOP expr
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{ emit1($1);
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#ifdef RELOCATION
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newrelo($2.typ, RELO2);
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#endif
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emit2($2.val);
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}
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| JMPOP '(' expr ')'
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{ emit1($1+0x20);
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#ifdef RELOCATION
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newrelo($3.typ, RELO2);
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#endif
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emit2($3.val);
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}
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| JSROP expr
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{ emit1($1);
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#ifdef RELOCATION
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newrelo($2.typ, RELO2);
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#endif
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emit2($2.val);
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}
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| LDXOP '#' expr
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{ emit1(0xA2);
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#ifdef RELOCATION
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newrelo($3.typ, RELO1);
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#endif
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emit1($3.val);
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}
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| LDXOP expr
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{ code($2,0xA6,0xAE); }
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| LDXOP expr ',' Y
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{ code($2,0xB6,0xBE); }
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| LDYOP '#' expr
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{ emit1(0xA0);
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#ifdef RELOCATION
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newrelo($3.typ, RELO1);
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#endif
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emit1($3.val);
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}
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| LDYOP expr
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{ code($2,0xA4,0xAC); }
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| LDYOP expr ',' X
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{ code($2,0xB4,0xBC); }
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| STXOP expr
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{ code($2,$1+0x06,$1+0x0E); }
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| STXOP expr ',' Y
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{ emit1($1+0x16);
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#ifdef RELOCATION
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newrelo($2.typ, RELO1);
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#endif
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emit1(lowb($2.val));
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}
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| STYOP expr
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{ code($2,$1+0x04,$1+0x0C); }
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| STYOP expr ',' X
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{ emit1($1+0x14);
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#ifdef RELOCATION
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newrelo($2.typ, RELO1);
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#endif
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emit1(lowb($2.val));
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}
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| addop '#' expr
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{ if ($1==0x80) serror("no store immediate");
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emit1($1+0x09);
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#ifdef RELOCATION
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newrelo($3.typ, RELO1);
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#endif
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emit1($3.val);
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}
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| addop expr
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{ code($2,$1+0x05,$1+0x0D); }
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| addop expr ',' X
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{ code($2,$1+0x15,$1+0x1D); }
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| addop expr ',' Y
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{ emit1($1+0x19);
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#ifdef RELOCATION
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newrelo($2.typ, RELO2);
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#endif
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emit2($2.val);
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}
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| addop '(' expr ',' X ')'
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{ emit1($1+0x01);
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#ifdef RELOCATION
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newrelo($3.typ, RELO1);
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#endif
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emit1(lowb($3.val));
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}
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| addop '(' expr ')' ',' Y
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{ emit1($1+0x11);
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#ifdef RELOCATION
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newrelo($3.typ, RELO1);
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#endif
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emit1(lowb($3.val));
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}
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| ROLOP /* Default is A. */
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{ emit1($1+0x0A); }
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| ROLOP A
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{ emit1($1+0x0A); }
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| ROLOP expr
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{ code($2,$1+0x06,$1+0x0E); }
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| ROLOP expr ',' X
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{ code($2,$1+0x16,$1+0x1E); }
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| BRAOP expr
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{ branch($1,$2); }
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| CPXOP '#' expr
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{ emit1($1+0x00);
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#ifdef RELOCATION
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newrelo($3.typ, RELO1);
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#endif
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emit1($3.val);
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}
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| CPXOP expr
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{ code($2,$1+0x04,$1+0x0C); }
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| INCOP expr
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{ code($2,$1+0x06,$1+0x0E); }
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| INCOP expr ',' X
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{ code($2,$1+0x16,$1+0x1E); }
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;
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addop
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: ADDOP
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| PSEU
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{ emit1($1>>8); $$ = $1 & 0xFF; }
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;
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