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ASM6502.PAS
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ASM6502.PAS
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Program ASM6502;
{$R-}
Const
Instr6502:Array[0..28]of Record
InstrName:String[7];
InstrOpcode:Byte;
End=(
(InstrName:'BRK';InstrOpcode:$00),
(InstrName:'PHP';InstrOpcode:$08),
(InstrName:'CLC';InstrOpcode:$18),
(InstrName:'PLP';InstrOpcode:$28),
(InstrName:'SEC';InstrOpcode:$38),
(InstrName:'RTI';InstrOpcode:$40),
(InstrName:'PHA';InstrOpcode:$48),
(InstrName:'CLI';InstrOpcode:$58),
(InstrName:'RTS';InstrOpcode:$60),
(InstrName:'PLA';InstrOpcode:$68),
(InstrName:'SEI';InstrOpcode:$78),
(InstrName:'DEY';InstrOpcode:$88),
(InstrName:'TXA';InstrOpcode:$8A),
(InstrName:'TYA';InstrOpcode:$98),
(InstrName:'TXS';InstrOpcode:$9A),
(InstrName:'TAY';InstrOpcode:$A8),
(InstrName:'TAX';InstrOpcode:$AA),
(InstrName:'CLV';InstrOpcode:$B8),
(InstrName:'TSX';InstrOpcode:$BA),
(InstrName:'INY';InstrOpcode:$C8),
(InstrName:'DEX';InstrOpcode:$CA),
(InstrName:'CLD';InstrOpcode:$D8),
(InstrName:'INX';InstrOpcode:$E8),
(InstrName:'NOP';InstrOpcode:$EA),
(InstrName:'SED';InstrOpcode:$F8),
(InstrName:'ASLA';InstrOpcode:$0A),
(InstrName:'ROLA';InstrOpcode:$2A),
(InstrName:'LSRA';InstrOpcode:$4A),
(InstrName:'RORA';InstrOpcode:$6A)
);
maxSymLen = 16;
maxOpcdLen = 5;
maxMacParms = 10;
symTabCols = 3;
white = #9' ';
alpha = ['A'..'Z','a'..'z','@','_'];
numeric = ['0'..'9'];
alphaNumeric = alpha + numeric;
oIllegal = 0;
oImplied = 1;
oBranch = 2;
oMode = 3;
oDB = 4;
oDW = 5;
oDS = 6;
oEQU = -7;
oORG = -8;
oRORG = -9;
oEND = 10;
oLIST = -11;
oOPT = -12;
oMACRO = -13;
oENDM = 14;
oMacName = 15;
oFCC = 16;
a_None = 0;
a_Imm = 1;
a_Abs = 3;
a_Zpg = 5;
a_Acc = 7;
a_Inx = 9;
a_Iny = 11;
a_Zpx = 13;
a_Abx = 15;
a_Aby = 17;
a_Ind = 19;
a_Zpy = 21;
Type
SymStr=String[maxSymLen];
SymPtr=^SymRec;
SymRec=Record
SymbolName:SymStr;
defined:Boolean;
value:Integer;
next:SymPtr;
multiDef:Boolean;
isSet:Boolean;
equ:Boolean;
known:Boolean;
End;
MacroLinePtr=^MacroLine;
MacroLine=Record
next:MacroLinePtr;
text:String;
End;
MacroParmPtr=^MacroParm;
MacroParm=Record
next:MacroParmPtr;
ParamName:SymStr;
End;
MacroPtr=^MacroRec;
MacroRec=Record
MacroName:SymStr;
def:Boolean;
text:MacroLinePtr;
next:MacroPtr;
parms:MacroParmPtr;
nparms:Integer;
End;
OpcdStr=String[maxOpcdLen];
ModeStr=String[22];
OpcdPtr=^OpcdRec;
OpcdRec=Record
OpcodeName:OpcdStr;
mode:ModeStr;
typ:Integer;
parm:Integer;
next:OpcdPtr;
End;
Var
symTab:SymPtr;
opcdTab:OpcdPtr;
macroTab,macPtr:MacroPtr;
macLine:MacroLinePtr;
macParms:Array[1..maxMacParms] of String;
lastLabel:SymStr;
locPtr:Word;
codPtr:Word;
outPtr:Word;
updLoc:Boolean;
errFlag:Boolean;
pass:Integer;
errCount:Integer;
CurrLine,ListLine:String;
listFlag,listMacFlag,macLineFlag,listThisLine,sourceEnd:Boolean;
instr:Array[1..3] of Integer;
instrLen:Integer;
bytStr:String;
showAddr:Boolean;
xferAddr:Word;
xferFound:Boolean;
evalKnown:Boolean;
cl_SrcName,cl_ListName,cl_ObjName,cl_BinName:String;
cl_Err:Boolean;
source,objet,listing:Text;
Binary:File of Byte;
Function LTrim(s:String):String;
Var
i:Integer;
Begin
i:=1;
While(i<=Length(s)) and (s[i] in [#9,' ']) do Inc(i);
Delete(s,1,i-1);
LTrim:=s;
End;
Function RTrim(s:String):String;
Var
i:Integer;
Begin
i:=Length(s);
While (i>0)and(s[i]in[#9,' '])do Dec(i);
s[0]:=Chr(i);
RTrim:=S;
End;
Function Trim(s:String):String;Begin
Trim:=LTrim(RTrim(s));
End;
Function StrToUpper(s:String):String;
Var
i:Integer;
Begin
For i:=1 to Length(s) do If s[i] in ['a'..'z']Then s[i] := UpCase(s[i]);
StrToUpper:=s;
End;
Function ByteHex2Str(value:Word):String;
Const
matrix:Array[0..15]of Char=('0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F');
Begin
value:=value and $FF;
ByteHex2Str:=matrix[(value shr 4) and $0F]+matrix[value and $F];
End;
Function HexWord2Str(value:Word):String;Begin
HexWord2Str:=ByteHex2Str(Hi(value))+ByteHex2Str(Lo(value));
End;
Procedure Error(ErrorMessage: String);Begin
errFlag:=True;
Inc(errCount);
If pass<>1 Then Begin
listThisLine:=True;
WriteLn(listing,'Erreur : ',ErrorMessage);
If cl_Err Then WriteLn('Erreur : ',ErrorMessage);
End;
End;
Procedure AddMacro(MyName:SymStr;Var macro:MacroPtr);Begin
New(macro);
macro^.MacroName:=MyName;
macro^.def:=FALSE;
macro^.text:=NIL;
macro^.next:=macroTab;
macro^.parms:=NIL;
macro^.nparms:=0;
macroTab:=macro;
End;
Procedure AddMacroParam(macro:MacroPtr;MyName:String);
Var
parm:MacroParmPtr;
p:MacroParmPtr;
Begin
New(parm);
parm^.next:=NIL;
parm^.ParamName:=StrToUpper(MyName);
macro^.nparms := macro^.nparms + 1;
p := macro^.parms;
If p=NIL Then macro^.parms := parm
Else
Begin
While p^.next<>NIL do p := p^.next;
p^.next := parm;
End;
End;
Procedure GetMacParms(macro:MacroPtr);
Var
i,n,p:Integer;
s:String;
done:Boolean;
parm:MacroParmPtr;
Begin
For i:=1 to maxMacParms do macParms[i]:='';
n:=0;
done:=False;
Repeat
i := 1;
While(i<=Length(CurrLine))and(CurrLine[i]<>';')and(CurrLine[i]<>',') do Begin
If CurrLine[i]='''' Then Begin
i:=i+1;
While (i<=Length(CurrLine))and(CurrLine[i]<>'''') do i := i + 1;
End;
i:=i+1;
End;
If CurrLine[i]=';' Then done:=True;
If i<>1 Then Begin
n:=n+1;
If n<=maxMacParms Then macParms[n] := Copy(CurrLine,1,i-1);
Delete(CurrLine,1,i);
End;
Until done or(Length(CurrLine)=0);
If(n>macro^.nparms)or(n>maxMacParms)Then Error('Trop de parametres dans la macro');
For i:=1 to n do macParms[i]:=Trim(macParms[i]);
CurrLine:='';
End;
Procedure DoMacParms;
Var
i,j,n:Integer;
word:String;
parm:MacroParmPtr;
Begin
i:=1;
While(i<=Length(CurrLine)) do Begin
While (i<=Length(CurrLine)) and Not(CurrLine[i] IN alpha)do Inc(i);
If i<=Length(CurrLine) Then Begin
j := i;
While(j<=Length(CurrLine))and(CurrLine[j] in alphaNumeric) do Inc(j);
word:=StrToUpper(Copy(CurrLine,i,j-i));
parm := macPtr^.parms;
n := 1;
While(parm<>NIL)and(parm^.ParamName<>word)do Begin
parm := parm^.next;
n:=n+1;
End;
If(parm<>NIL)and(n<=maxMacParms)Then Begin
Delete(CurrLine,i,j-i);
Insert(macParms[n],CurrLine,i);
i:=i+Length(macParms[n]);
End
Else
i:=j;
End;
End;
End;
Procedure AddMacroLine(macro:MacroPtr;line:String);
Var
m,p:MacroLinePtr;
Begin
GetMem(m,SizeOf(MacroLine)-255+Length(line));
m^.next := NIL;
Move(line,m^.text,Length(line) + 1);
p := macro^.text;
If p=NIL Then macro^.text := m
Else
Begin
While p^.next<>NIL do p := p^.next;
p^.next := m;
End;
End;
Procedure FindMacro(MyName:SymStr;Var macro:MacroPtr);
Var
found:Boolean;
Begin
macro:=macroTab;
found:=False;
While(macro<>NIL)and NOT found do Begin
found := (macro^.MacroName = MyName);
If Not found Then macro := macro^.next;
End;
End;
Procedure AddOpcode(MyName:OpcdStr;mode:ModeStr;typ,parm:Integer);
Var
p:OpcdPtr;
Begin
New(p);
p^.OpcodeName:=MyName;
p^.mode:=mode;
p^.typ:=typ;
p^.parm:=parm;
p^.next:=opcdTab;
opcdTab:=p;
End;
Procedure FindOpcode(MyName:String;Var typ,parm:Integer;Var mode:ModeStr;Var macro:MacroPtr);
Var
p:OpcdPtr;
found:Boolean;
Begin
macro:=NIL;
found:=False;
p:=opcdTab;
While (p<>NIL) and Not found do Begin
found := (p^.OpcodeName = MyName);
If Not found Then p := p^.next;
End;
If Not found Then Begin
typ:=oIllegal;
parm:=0;
mode:='';
FindMacro(MyName,macro);
If macro<>NIL Then typ:=oMacName;
End
Else
Begin
typ:=p^.typ;
parm:=p^.parm;
mode:=p^.mode;
End;
End;
Procedure InitOpcodes;
Var
I:Byte;
Begin
opcdTab:=NIL;
For I:=0 to High(Instr6502)do AddOpcode(Instr6502[I].InstrName,'',oImplied,Instr6502[I].InstrOpcode);
AddOpcode('BPL','',oBranch,$10);
AddOpcode('BMI','',oBranch,$30);
AddOpcode('BVC','',oBranch,$50);
AddOpcode('BVS','',oBranch,$70);
AddOpcode('BCC','',oBranch,$90);
AddOpcode('BCS','',oBranch,$B0);
AddOpcode('BNE','',oBranch,$D0);
AddOpcode('BEQ','',oBranch,$F0);
{ ImAbZpAcIxIyZxAxAyInZy }
AddOpcode('ORA','090D05 0111151D19 ',oMode,0);
AddOpcode('ASL',' 0E060A 161E ',oMode,0);
AddOpcode('JSR',' 20 ',oMode,0);
AddOpcode('AND','292D25 2131353D39 ',oMode,0);
AddOpcode('BIT',' 2C24 ',oMode,0);
AddOpcode('ROL',' 2E262A 363E ',oMode,0);
AddOpcode('EOR','494D45 4151555D59 ',oMode,0);
AddOpcode('LSR',' 4E464A 565E ',oMode,0);
AddOpcode('JMP',' 4C 6C ',oMode,0);
AddOpcode('ADC','696D65 6171757D79 ',oMode,0);
AddOpcode('ROR',' 6E666A 767E ',oMode,0);
AddOpcode('STA',' 8D85 8191959D99 ',oMode,0);
AddOpcode('STY',' 8C84 94 ',oMode,0);
AddOpcode('STX',' 8E86 96',oMode,0);
AddOpcode('LDY','A0ACA4 B4BC ',oMode,0);
AddOpcode('LDA','A9ADA5 A1B1B5BDB9 ',oMode,0);
AddOpcode('LDX','A2AEA6 BE B6',oMode,0);
AddOpcode('CPY','C0CCC4 ',oMode,0);
AddOpcode('CMP','C9CDC5 C1D1D5DDD9 ',oMode,0);
AddOpcode('DEC',' CEC6 D6DE ',oMode,0);
AddOpcode('CPX','E0ECE4 ',oMode,0);
AddOpcode('SBC','E9EDE5 E1F1F5FDF9 ',oMode,0);
AddOpcode('INC',' EEE6 F6FE ',oMode,0);
AddOpcode('DB' ,'',oDB ,0);
AddOpcode('FCB' ,'',oDB ,0);
AddOpcode('BYTE' ,'',oDB ,0);
AddOpcode('DW' ,'',oDW ,0);
AddOpcode('FDB' ,'',oDW ,0);
AddOpcode('WORD' ,'',oDW ,0);
AddOpcode('DS' ,'',oDS ,0);
AddOpcode('RMB' ,'',oDS ,0);
AddOpcode('BLKB' ,'',oDS ,0);
AddOpcode('FCC' ,'',oFCC,0);
AddOpcode('=' ,'',oEQU,0);
AddOpcode('EQU' ,'',oEQU,0);
AddOpcode('SET' ,'',oEQU,1);
AddOpcode('ORG' ,'',oORG ,0);
AddOpcode('AORG' ,'',oORG ,0);
AddOpcode('RORG' ,'',oRORG ,0);
AddOpcode('END' ,'',oEND ,0);
AddOpcode('LIST' ,'',oLIST ,0);
AddOpcode('OPT' ,'',oOPT ,0);
AddOpcode('MACRO','',oMACRO,0);
AddOpcode('ENDM' ,'',oENDM ,0);
End;
Function FindSym(symName:SymStr):SymPtr;
Var
p:SymPtr;
found:Boolean;
Begin
found:=False;
p:=SymTab;
While(p<>NIL)and Not Found do Begin
found:=(p^.SymbolName=symName);
If Not found Then p := p^.next;
End;
FindSym:=p;
End;
Function AddSym(symName:SymStr):SymPtr;
Var
p:SymPtr;
Begin
New(p);
With p^ do Begin
SymbolName:=SymName;
value:=0;
next:=SymTab;
defined:=False;
multiDef:=False;
isSet:=False;
equ:=False;
known:=False;
End;
symTab:=p;
AddSym:=p;
End;
Function RefSym(symName:SymStr;Var known:Boolean):Integer;
Var
p:SymPtr;
Begin
p:=FindSym(symName);
If p=NIL Then p:=AddSym(symName);
If Not p^.defined Then Error('Symbole "'+symName+'" non-defini');
RefSym:=p^.value;
Case pass of
1:If Not p^.defined Then known:=False;
2:If Not p^.known Then known:=False;
End;
End;
Procedure DefSym(symName:SymStr;val:Integer;setSym,equSym:Boolean);
Var
p:SymPtr;
Begin
If Length(symName)<>0 Then Begin
p:=FindSym(symName);
If p=NIL Then p:=AddSym(symName);
If (Not p^.defined) or (p^.isSet and setSym)Then Begin
p^.value:=val;
p^.defined:=True;
p^.isSet:=setSym;
p^.equ:=equSym;
End
Else
If p^.value<>val Then Begin
p^.multiDef:=True;
Error('Symbole "'+symName+'" definie de multiple fois');
End;
If pass=2 Then p^.known:=True;
End;
End;
Function GetWord:String;
Var
word:String;
done:Boolean;
Begin
CurrLine:=Trim(CurrLine);
word:='';
If Length(CurrLine)>0 Then
If(CurrLine[1]=#12)or(CurrLine[1]=';')Then CurrLine:='';
If Length(CurrLine)>0 Then Begin
If Not(CurrLine[1] in alphaNumeric)Then Begin
word := Copy(CurrLine,1,1);
Delete(CurrLine,1,1);
If Length(CurrLine)>0 Then Begin
If((word[1]='<')and(CurrLine[1]='<'))or((word[1]='>')and(CurrLine[1]='>'))Then Begin
word:=word+Copy(CurrLine,1,1);
Delete(CurrLine,1,1);
End;
End;
End
Else
Begin
done:=False;
While(Length(CurrLine)>0) and Not done do Begin
word:=word+Upcase(CurrLine[1]);
Delete(CurrLine,1,1);
If Length(CurrLine)>0 Then done:=Not(CurrLine[1] in alphaNumeric);
End;
End;
End;
GetWord := StrToUpper(word);
END;
Procedure Expect(expected:String);Begin
If GetWord<>expected Then Error('"' + expected + '" attendue');
End;
Function EvalBin(binStr:String):Integer;
Var
binVal,i,n:Integer;
evalErr:Boolean;
Begin
evalErr:=False;
binVal:=0;
For i:=1 to Length(binStr) do Begin
n:=Pos(binStr[i],'01');
If n=0 Then evalErr := True
Else binVal := binVal*2 + n-1;
End;
If evalErr Then Begin
binVal:=0;
Error('Nombre octal invalide');
End;
EvalBin := binVal;
End;
Function EvalOct(octStr:String):Integer;
Var
octVal,i,n:Integer;
evalErr:Boolean;
Begin
evalErr:=False;
octVal:=0;
For i:=1 to Length(octStr) do Begin
n:=Pos(octStr[i],'01234567');
If n=0 Then evalErr:=True
Else octVal:=octVal*8+n-1;
End;
If evalErr Then Begin
octVal:=0;
Error('Nombre octal invalide');
End;
EvalOct:=octVal;
End;
Function EvalDec(decStr:String):Integer;
Var
decVal,i,n:Integer;
evalErr:Boolean;
Begin
evalErr:=False;
decVal:=0;
For i:=1 to Length(decStr) do Begin
n:=Pos(decStr[i],'0123456789');
If n=0 Then evalErr:=True
Else decVal:=decVal*10+n-1;
End;
If(evalErr)Then Begin
decVal := 0;
Error('Nombre decimal invalide');
End;
EvalDec:=decVal;
End;
Function EvalHex(hexStr:String):Integer;
Var
hexVal,i,n:Integer;
evalErr:Boolean;
Begin
evalErr:=False;
hexVal:=0;
For i:=1 TO Length(hexStr)do Begin
n:=Pos(Upcase(hexStr[i]),'0123456789ABCDEF');
If n=0 Then evalErr:=True
Else hexVal:=hexVal*16+n-1;
End;
If(evalErr)Then Begin
hexVal:=0;
Error('Nombre hexadecimal invalide');
END;
EvalHex:=hexVal;
End;
Function Eval0:Integer; Forward;
Function Factor:Integer;
Var
word:String;
val:Integer;
Begin
word:=GetWord;
val:=0;
If Length(word)=0 Then Error('Operande attendue') Else
If (word='.')or(word='*')Then val := locPtr Else
If word='-'Then val:=-Factor Else
If word='+'Then val:=Factor Else
If word='~'Then val:=-Factor-1 Else
If word='<'Then val:=Factor and 255 Else
If word='>'Then val:=(Factor shr 8) and 255 Else
If word='%'Then Begin
Word:=GetWord;
val:=EvalBin(word);
End
Else
If word='$'Then Begin
Word:=GetWord;
If Length(word)=0 Then val:=locPtr
Else val:=EvalHex(word);
End
Else
If word='('Then Begin
val:=Eval0;
Expect(')');
End
Else
If word=''''Then Begin
If Length(CurrLine)=0 Then Error('Operande attendue')
Else
Begin
val:=Ord(CurrLine[1]);
Delete(CurrLine,1,1);
Expect('''');
End;
End
Else
If word[1]='@'Then val:=RefSym(lastLabel+word,evalKnown)Else
If word[1] in numeric Then Begin
Case word[Length(word)] of
'O': val:=EvalOct(Copy(word,1,Length(word)-1));
'D': val:=EvalDec(Copy(word,1,Length(word)-1));
'H': val:=EvalHex(Copy(word,1,Length(word)-1));
'B': val:=EvalBin(Copy(word,1,Length(word)-1));
Else val:=EvalDec(word);
End;
End
Else
val:=RefSym(word,evalKnown);
Factor:=val;
End;
Function Term:Integer;
Var
word:String;
val:Integer;
oldLine:String;
Begin
val:=Factor;
oldLine:=CurrLine;
word:=GetWord;
While(word='*')or(word='/')or(word='%')do Begin
Case word[1]of
'*': val:=val * Factor;
'/': val:=val div Factor;
'%': val:=val mod Factor;
End;
oldLine:=CurrLine;
word:=GetWord;
End;
CurrLine:=oldLine;
Term:=val;
End;
Function Eval1:Integer;
Var
val:Integer;
word,oldLine:String;
Begin
val:=Term;
oldLine:=CurrLine;
word:=GetWord;
While (word='+')or(word='-') do Begin
Case word[1] of
'+': val:=val+Term;
'-': val:=val-Term;
End;
oldLine := CurrLine;
word := GetWord;
End;
CurrLine := oldLine;
Eval1 := val;
End;
Function Eval0:Integer;
Var
word:String;
val:Integer;
oldLine:String;
Begin
val:=Eval1;
oldLine:=CurrLine;
word:=GetWord;
While(word='&')or(word='|')or(word='<<')or(word='>>')do Begin
Case word[1] of
'&':val:=val and Eval1;
'|':val:=val or Eval1;
'<':val:=val shl Eval1;
'>':val:=val shr Eval1;
End;
oldLine:=CurrLine;
word:=GetWord;
End;
CurrLine:=oldLine;
Eval0:=val;
End;
Function Eval:Integer;Begin
evalKnown:=True;
Eval:=Eval0;
End;
Function EvalByte:Integer;
Var
val:Integer;
Begin
val:=Eval;
If(val<-128)or(val>255)Then Error('Octet en dehors de l''intervalle');
EvalByte:=val and 255;
End;
Function FindReg(regName,regList,valList:String):Integer;
Var
p,reg,code:Integer;
Begin
p:=Pos(' '+Trim(regName)+' ',regList);
If p=0 Then Begin
reg := 0;
Error('Registre non autorise "'+Trim(RegName)+'"');
End
Else
Val(Copy(valList,p,2),reg,code);
FindReg := reg;
End;
Procedure CodeOut(_byte:Integer);Begin
If (pass=2) and updLoc Then Begin
WriteLn(objet,':',HexWord2Str(codPtr));
outPtr := codPtr;
updLoc := FALSE;
End;
outPtr := outPtr + 1;
If pass=2 Then Begin
WriteLn(objet,ByteHex2Str(_byte));
Write(Binary,Byte(_byte));
End;
End;
Procedure AddLocPtr(ofs:Word);Begin
updLoc := updLoc or (codPtr+ofs<>outPtr);
codPtr := codPtr + ofs;
locPtr := locPtr + ofs;
End;
Procedure CodeAbsOrg(addr:Word);Begin
updLoc := updLoc or (addr<>outPtr);
locPtr := addr;
codPtr := addr;
End;
Procedure CodeRelOrg(addr: Word);Begin
locPtr := addr;
End;
Procedure CodeEnd;Begin
If (pass=2) and xferFound Then WriteLn(objet,'$',HexWord2Str(xferAddr));
End;
Procedure CodeXfer(addr:Integer);Begin
xferAddr := addr;
xferFound := True;
End;
Procedure DoOpcode(typ,parm:Integer;modes:String;macro:MacroPtr);
Var
val:Integer;
word:String;
oldLine:String;
mode:Integer;
ch:Char;
done:Boolean;
Begin
Case typ of
oImplied:Begin
instr[1]:=parm;
instrLen:=1;
End;
oBranch:Begin
val:=Eval;
val:=val-locPtr-2;
If(val<-128)or(val>127)Then Begin
Error('Branchement en dehors de l''intervalle');
val:=0;
End;
instr[1]:=parm;
instr[2]:=val;
instrLen:=2;
End;
oMode:Begin
CurrLine:=Trim(CurrLine);
mode:=a_None;
val:=0;
If Length(CurrLine)=0 Then mode:=a_Acc Else
Case CurrLine[1]of
';':mode:=a_Acc;
'#':Begin
Expect('#');
val:=Eval;
mode:=a_Imm;
End;
'[':Begin
Expect('[');
val:=Eval;
Expect(']');
mode:=a_Ind;
End;
'(':Begin
Expect('(');
val:=Eval;
CurrLine:=Trim(CurrLine);
If Length(CurrLine)>0 Then Case CurrLine[1]of
',':Begin
Expect(',');
Expect('X');
Expect(')');
mode:=a_Inx;
End;
')':Begin
Expect(')');
CurrLine:=LTrim(CurrLine);
If(Length(CurrLine)=0)or(CurrLine[1]=';')Then Begin
mode:=a_Ind;
End
Else
Begin
Expect(',');
Expect('Y');
mode:=a_Iny;
End;
End;
Else mode:=a_None;
End;
End;
Else Begin
CurrLine:=Trim(CurrLine);
If(Upcase(CurrLine[1])='A')and((Length(CurrLine)=1)or
((Length(CurrLine)>1)and((CurrLine[2]=';')or
(Pos(CurrLine[2],white)<>0))))Then Begin
Expect('A');
mode:=a_Acc;
End
Else
Begin
val:=Eval;
CurrLine:=Trim(CurrLine);
If(Length(CurrLine)=0)or(CurrLine[1]=';')Then
If(val>=0)and(val<256)and evalKnown and(modes[a_Zpg]<>' ')Then mode:=a_Zpg
Else mode:=a_Abs
Else Begin
Expect(',');
word:=GetWord;
If word='X' Then Begin
If(val>=0)and(val<256)and(evalKnown or(modes[a_Abx]=' '))Then mode:=a_Zpx
Else mode:=a_Abx;
End
Else
IF word='Y' Then
If(val>=0)and(val<256)and(evalKnown or(modes[a_Aby]=' '))and(modes[a_Zpy]<>' ')Then mode:=a_Zpy
Else mode:=a_Aby
End;
End;
End;
End;
If(mode<>a_None)and(modes[mode]=' ')Then mode:=a_None;
If mode<>a_None Then Begin
word:=Copy(modes,mode,2);
instr[1]:=EvalHex(word);
End;
instrLen:=0;
Case mode of
a_None:Error('Mode d''adressage invalide');
a_Acc:instrLen:=1;
a_Imm,a_Zpg,a_Inx,a_Iny,a_Zpx,a_Zpy:Begin
instr[2]:=val AND 255;
instrLen:=2;
End;
a_Abs,a_Abx,a_Aby,a_Ind:Begin
instr[2]:=val AND 255;
instr[3]:=val SHR 8;
instrLen := 3;
End;
End;
End;
oDB:Begin
bytStr:='';
oldLine:=CurrLine;
word:=GetWord;
If Length(word)=0 Then Error('Operande attendue');
While Length(word)<>0 do Begin
If word=''''Then While word='''' do Begin
val:=Pos('''',CurrLine);
If val=0 Then Begin
bytStr:=bytStr+CurrLine;
CurrLine:='';
word:='';
End
Else
Begin
bytStr:=bytStr+Copy(CurrLine,1,val-1);
Delete(CurrLine,1,val);
word:=GetWord;
If word='''' Then bytStr:=bytStr+'''';
End;
End
Else
Begin
CurrLine:=oldLine;
bytStr:=bytStr+Chr(EvalByte);
word:=GetWord;
End;
If word=','Then Begin
oldLine:=CurrLine;
word:=GetWord;
If Length(word)=0 Then Error('Operande attendue');
End
Else
Begin
CurrLine:=word+' '+CurrLine;
word:='';
End;
End;
instrLen:=-Length(bytStr);
End;
oDW:Begin
bytStr:='';
oldLine:=CurrLine;
word:=GetWord;
If Length(word)=0 Then Error('Operande attendue');
While Length(word)<>0 do Begin
CurrLine:=oldLine;
val:=Eval;
bytStr:=bytStr+Chr(val and 255)+Chr(val shr 8);
word:=GetWord;
oldLine:=CurrLine;
If word=','Then Begin
word:=GetWord;
If Length(word)=0 Then Error('Operande attendue');
End;
End;
instrLen:=-Length(bytStr);
End;
oDS:Begin
val := Eval;
If pass=2 Then Begin
showAddr:=False;
Delete(listLine,1,13);
listLine:=HexWord2Str(codPtr)+': ('+HexWord2Str(val)+')'+listLine;
End;
AddLocPtr(val);
End;
oEND:Begin