203 lines
3.4 KiB
C
203 lines
3.4 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 6809 parsing rules
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*/
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operation
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: SETDP expr
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{ dpvalue = $2.val;}
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NOARG
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{ emit1or2($1);}
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BRANCH expr
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{ branch($1,$2);}
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LBRNCH expr
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{ emit1(0x10); emit1($1);
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$2.val -= (DOTVAL+2);
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#ifdef RELOCATION
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if (rflag != 0 && PASS_RELO)
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newrelo($2.typ, RELPC|RELO2|RELBR);
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#endif
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emit2($2.val);
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}
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SBRNCH expr
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{ emit1($1);
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$2.val -= (DOTVAL+2);
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#ifdef RELOCATION
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if (rflag != 0 && PASS_RELO)
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newrelo($2.typ, RELPC|RELO2|RELBR);
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#endif
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emit2($2.val);
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}
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IMMED '#' expr
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{ emit1($1);
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#ifdef RELOCATION
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if (rflag != 0 && PASS_RELO)
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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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XOP '#' expr
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{ emit1or2($1 - 0x20);
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switch ($1 & 0x0F) {
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case 0x03:
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case 0x0C:
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case 0x0E:
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#ifdef RELOCATION
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if (rflag != 0 && PASS_RELO)
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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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break;
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default:
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#ifdef RELOCATION
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if (rflag != 0 && PASS_RELO)
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newrelo($3.typ, RELO1);
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#endif
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emit1($3.val);
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break;
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}
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}
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XOP '<' expr
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{ if (0 <= $1 && $1 < 0x80)
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emit1(($1-0x10) & 0x3F);
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else
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emit1or2($1 - 0x10);
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#ifdef RELOCATION
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if (rflag != 0 && PASS_RELO)
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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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XOP '>' expr
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{ emit1or2($1 + 0x10);
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#ifdef RELOCATION
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if (rflag != 0 && PASS_RELO)
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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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STACK reglist
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{ emit1($1); emit1($2);}
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TWOREG REG ',' REG
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{
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emit1($1);
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emit1($2 << 4 | $4);
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}
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XOP REG
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{ switch ($2) {
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case A: emit1($1 - 0x20);
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break;
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case B: emit1($1 - 0x10);
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break;
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default:serror("register error");
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}
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}
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XOP expr ',' REG
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{ emit1or2($1);
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offset($4,$2,0);
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}
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XOP '(' expr ',' REG ')'
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{ emit1or2($1);
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offset($5,$3,0x10);
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}
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XOP '(' expr ')'
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{ emit1or2($1);
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emit1(0x9F);
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#ifdef RELOCATION
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if (rflag != 0 && PASS_RELO)
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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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XOP xmode
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{ emit1or2($1);
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emit1($2);
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}
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XOP '(' xmode ')'
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{ if (($3 & 0x8D) == 0x80)
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serror("invalid index mode");
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emit1or2($1);
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emit1($3 + 0x10);
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}
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XOP expr
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{ if (($2.typ & S_TYP) == S_ABS &&
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((unsigned)$2.val >> 8) == dpvalue
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) {
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if (0 <= $1 && $1 < 0x80)
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emit1(($1-0x20) & 0x3F);
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else
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emit1or2($1 - 0x10);
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emit1($2.val);
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} else {
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emit1or2($1 + 0x10);
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#ifdef RELOCATION
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if (rflag != 0 && PASS_RELO)
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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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;
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reglist : ALL
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| REG
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{ if (($$ = regbit[$1]) < 0) serror("register error");}
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reglist ',' REG
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{ register i;
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if ((i = regbit[$3]) < 0 || ($1 & i) != 0)
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serror("register error");
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$$ = $1 | i;
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}
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;
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xyus : REG
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{ if (($$ = regno($1)) < 0) serror("register error");}
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;
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xmode : ',' xyus '+' '+'
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{ $$ = 0x81 + $2;}
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',' xyus '+'
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{ $$ = 0x80 + $2;}
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',' xyus
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{ $$ = 0x84 + $2;}
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',' '-' '-' xyus
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{ $$ = 0x83 + $4;}
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',' '-' xyus
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{ $$ = 0x82 + $3;}
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REG ',' xyus
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{ switch($1) {
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case A: $$ = 0x86 + $3; break;
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case B: $$ = 0x85 + $3; break;
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case D: $$ = 0x8B + $3; break;
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default: serror("register error");
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}
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}
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;
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