194 lines
2.8 KiB
C
194 lines
2.8 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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* Motorola 6805 parsing rules
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*/
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expr8
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:
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expr
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{
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fit(fitb($1.val));
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}
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;
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bitexp
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:
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absexp
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{
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fit((unsigned) $1 <= 7);
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$$ = $1 & 07;
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}
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;
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operation
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:
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NOARG
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{ emit1($1);}
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BRANCH expr
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{ branch($1,$2);}
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BBRANCH bitexp ',' expr8 ',' expr
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{
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branch($1+($2 << 1), $6, $4);
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}
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BIT bitexp ',' expr8
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{
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emit1($1+($2 << 1));
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#ifdef RELOCATION
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newrelo($4.typ, RELO1);
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#endif
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emit1($4.val);
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}
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RMR '<' expr8
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RMR expr8
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{
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emit1($1);
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#ifdef RELOCATION
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newrelo($2.typ, RELO1);
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#endif
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emit1($2.val);
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}
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RMR expr8 ',' X
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{
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if(small($2.val == 0 &&
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($2.typ & ~S_DOT) == DOTTYP &&
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pass == PASS_2, 1))
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emit1($1+0x40);
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else
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{
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emit1($1+0x30);
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#ifdef RELOCATION
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newrelo($2.typ, RELO1);
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#endif
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emit1($2.val);
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}
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}
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RMR ',' X
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{ emit1($1+0x40); }
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RM '#' expr8
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{
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switch($1) {
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case 0xa7:
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case 0xac:
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case 0xad:
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case 0xaf:
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serror("mode error");
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default:
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emit1($1);
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}
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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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RM '<' expr8
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{
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emit1($1+0x10);
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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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RM expr
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{
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if(small(pass == PASS_2 &&
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($2.typ & ~S_DOT) == DOTTYP &&
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fitb($2.val),1)) {
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emit1($1+0x10);
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#ifdef RELOCATION
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newrelo($2.typ, RELO1);
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#endif
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emit1($2.val);
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} else {
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emit1($1+0x20);
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#ifdef RELOCATION
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newrelo($2.typ, RELO2|RELBR);
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#endif
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emit2($2.val);
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}
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}
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RM '>' expr
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{
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emit1($1+0x20);
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#ifdef RELOCATION
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newrelo($3.typ, RELO2|RELBR);
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#endif
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emit2($3.val);
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}
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RM '>' expr ',' X
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{
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emit1($1+0x30);
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#ifdef RELOCATION
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newrelo($3.typ, RELO2|RELBR);
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#endif
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emit2($3.val);
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}
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RM expr ',' X
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{
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if(small(pass == PASS_2 &&
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($2.typ & ~S_DOT) == DOTTYP &&
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fitb($2.val),1)) {
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if(small(pass == PASS_2 &&
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($2.typ & ~S_DOT) == DOTTYP &&
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$2.val == 0,1))
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emit1($1+0x50);
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else {
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emit1($1+0x40);
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#ifdef RELOCATION
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newrelo($2.typ, RELO1);
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#endif
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emit1($2.val);
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}
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} else {
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small(0,1); /* dummy */
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emit1($1+0x30);
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#ifdef RELOCATION
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newrelo($2.typ, RELO2|RELBR);
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#endif
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emit2($2.val);
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}
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}
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RM '<' expr8 ',' X
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{
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emit1($1+0x40);
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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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RM ',' X
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{ emit1($1+0x50); }
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CMOS
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{
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switch($1) {
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case 0:
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opt_cmos = 1;
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break;
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case 0x8e:
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case 0x8f:
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if(! opt_cmos)
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serror("bad opcode");
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emit1($1);
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}
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}
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;
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