{
$Id: rasm.pas,v 1.13 2003/02/19 22:00:16 daniel Exp $
Copyright (c) 1998-2000 by Carl Eric Codere
This unit does the parsing process for the motorola inline assembler
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
****************************************************************************
}
Unit Rasm;
{**********************************************************************}
{ WARNING }
{**********************************************************************}
{ Any modification in the order or removal of terms in the tables }
{ in m68k.pas and asmo68k.pas will BREAK the code in this unit, }
{ unless the appropriate changes are made to this unit. Addition }
{ of terms though, will not change the code herein. }
{**********************************************************************}
{---------------------------------------------------------------------------}
{ LEFT TO DO }
{---------------------------------------------------------------------------}
{ o Add support for sized indexing such as in d0.l }
{ presently only (an,dn) is supported for indexing -- }
{ size defaults to LONG. }
{ o Add support for MC68020 opcodes. }
{ o Add support for MC68020 adressing modes. }
{ o Add operand checking with m68k opcode table in ConcatOpCode }
{ o Add Floating point support }
{---------------------------------------------------------------------------}
Interface
{$i fpcdefs.inc}
Uses
node,cpubase;
function assemble: tnode;
Implementation
uses
{ common }
cutils,cclasses,
{ global }
globtype,globals,verbose,
systems,
{ aasm }
cpuinfo,aasmbase,aasmtai,aasmcpu,
{ symtable }
symconst,symbase,symtype,symsym,symtable,
{ pass 1 }
nbas,
{ parser }
scanner,agcpugas,
rautils
;
const
{ this variable is TRUE if the lookup tables have already been setup }
{ for fast access. On the first call to assemble the tables are setup }
{ and stay set up. }
_asmsorted: boolean = FALSE;
firstasmreg = R_D0;
lastasmreg = R_FPSR;
type
tiasmops = array[firstop..lastop] of string[7];
piasmops = ^tiasmops;
tasmkeyword = string[6];
var
{ sorted tables of opcodes }
iasmops: piasmops;
{ uppercased tables of registers }
iasmregs: array[firstasmreg..lastasmreg] of string[6];
const
regname_count=17;
regname_count_bsstart=16;
regname2regnum:array[0..regname_count-1] of regname2regnumrec=(
(name:'A0'; number:NR_A0),
(name:'A1'; number:NR_A1),
(name:'A2'; number:NR_A2),
(name:'A3'; number:NR_A3),
(name:'A4'; number:NR_A4),
(name:'A5'; number:NR_A5),
(name:'A6'; number:NR_A6),
(name:'A7'; number:NR_A7),
(name:'D0'; number:NR_D0),
(name:'D1'; number:NR_D1),
(name:'D2'; number:NR_D2),
(name:'D3'; number:NR_D3),
(name:'D4'; number:NR_D4),
(name:'D5'; number:NR_D5),
(name:'D6'; number:NR_D6),
(name:'D7'; number:NR_D7),
(name:'SP'; number:NR_A7));
type
tasmtoken = (
AS_NONE,AS_LABEL,AS_LLABEL,AS_STRING,AS_HEXNUM,AS_OCTALNUM,
AS_BINNUM,AS_COMMA,AS_LBRACKET,AS_RBRACKET,AS_LPAREN,
AS_RPAREN,AS_COLON,AS_DOT,AS_PLUS,AS_MINUS,AS_STAR,AS_INTNUM,
AS_SEPARATOR,AS_ID,AS_REGISTER,AS_OPCODE,AS_SLASH,AS_APPT,AS_REALNUM,
AS_ALIGN,
{------------------ Assembler directives --------------------}
AS_DB,AS_DW,AS_DD,AS_XDEF,AS_END,
{------------------ Assembler Operators --------------------}
AS_MOD,AS_SHL,AS_SHR,AS_NOT,AS_AND,AS_OR,AS_XOR);
const
firstdirective = AS_DB;
lastdirective = AS_END;
firstoperator = AS_MOD;
lastoperator = AS_XOR;
_count_asmdirectives = longint(lastdirective)-longint(firstdirective);
_count_asmoperators = longint(lastoperator)-longint(firstoperator);
_asmdirectives : array[0.._count_asmdirectives] of tasmkeyword =
('DC.B','DC.W','DC.L','XDEF','END');
{ problems with shl,shr,not,and,or and xor, they are }
{ context sensitive. }
_asmoperators : array[0.._count_asmoperators] of tasmkeyword = (
'MOD','SHL','SHR','NOT','AND','OR','XOR');
const
newline = #10;
firsttoken : boolean = TRUE;
operandnum : byte = 0;
var
actasmtoken: tasmtoken;
actasmpattern: string;
c: char;
old_exit : pointer;
curlist : taasmoutput;
Procedure SetupTables;
{ creates uppercased symbol tables for speed access }
var
i: tasmop;
j: tregister;
Begin
{Message(asmr_d_creating_lookup_tables);}
{ opcodes }
new(iasmops);
for i:=firstop to lastop do
iasmops^[i] := upper(gas_op2str[i]);
{ opcodes }
for j.enum:=firstasmreg to lastasmreg do
iasmregs[j.enum] := upper(std_reg2str[j.enum]);
end;
{---------------------------------------------------------------------}
{ Routines for the tokenizing }
{---------------------------------------------------------------------}
function regnum_search(const s:string):Tnewregister;
{Searches the register number that belongs to the register in s.
s must be in uppercase!.}
var i,p:byte;
begin
{Binary search.}
p:=0;
i:=regname_count_bsstart;
while i<>0 do
begin
if (p+i<regname_count) and (upper(regname2regnum[p+i].name)<=s) then
p:=p+i;
i:=i shr 1;
end;
if upper(regname2regnum[p].name)=s then
regnum_search:=regname2regnum[p].number
else
regnum_search:=NR_NO;
end;
function is_asmopcode(s: string):Boolean;
{*********************************************************************}
{ FUNCTION is_asmopcode(s: string):Boolean }
{ Description: Determines if the s string is a valid opcode }
{ if so returns TRUE otherwise returns FALSE. }
{ Remark: Suffixes are also checked, as long as they are valid. }
{*********************************************************************}
var
i: tasmop;
j: byte;
Begin
is_asmopcode := FALSE;
{ first of all we remove the suffix }
j:=pos('.',s);
if j<>0 then
delete(s,j,2);
for i:=firstop to lastop do
begin
if s = iasmops^[i] then
begin
is_asmopcode:=TRUE;
exit;
end;
end;
end;
Procedure is_asmdirective(const s: string; var token: tasmtoken);
{*********************************************************************}
{ FUNCTION is_asmdirective(s: string; var token: tinteltoken):Boolean }
{ Description: Determines if the s string is a valid directive }
{ (an operator can occur in operand fields, while a directive cannot) }
{ if so returns the directive token, otherwise does not change token.}
{*********************************************************************}
var
i:byte;
Begin
for i:=0 to _count_asmdirectives do
begin
if s=_asmdirectives[i] then
begin
token := tasmtoken(longint(firstdirective)+i);
exit;
end;
end;
end;
Procedure is_register(const s: string; var token: tasmtoken);
{*********************************************************************}
{ PROCEDURE is_register(s: string; var token: tinteltoken); }
{ Description: Determines if the s string is a valid register, if }
{ so return token equal to A_REGISTER, otherwise does not change token}
{*********************************************************************}
var
i: tregister;
begin
if regnum_search(s)=NR_NO then
begin
for i.enum:=firstasmreg to lastasmreg do
begin
if s=iasmregs[i.enum] then
begin
token := AS_REGISTER;
exit;
end;
end;
{ take care of other name for sp }
if s = 'A7' then
begin
token:=AS_REGISTER;
exit;
end;
end
else
token:=AS_REGISTER;
end;
Function GetToken: tasmtoken;
{*********************************************************************}
{ FUNCTION GetToken: tinteltoken; }
{ Description: This routine returns intel assembler tokens and }
{ does some minor syntax error checking. }
{*********************************************************************}
var
token: tasmtoken;
forcelabel: boolean;
begin
forcelabel := FALSE;
actasmpattern :='';
{* INIT TOKEN TO NOTHING *}
token := AS_NONE;
{ while space and tab , continue scan... }
while c in [' ',#9] do
c:=current_scanner.asmgetchar;
if not (c in [newline,#13,'{',';']) then
current_scanner.gettokenpos;
{ Possiblities for first token in a statement: }
{ Local Label, Label, Directive, Prefix or Opcode.... }
if firsttoken and not (c in [newline,#13,'{',';']) then
begin
firsttoken := FALSE;
if c = '@' then
begin
token := AS_LLABEL; { this is a local label }
{ Let us point to the next character }
c := current_scanner.asmgetchar;
end;
while c in ['A'..'Z','a'..'z','0'..'9','_','@','.'] do
begin
{ if there is an at_sign, then this must absolutely be a label }
if c = '@' then forcelabel:=TRUE;
actasmpattern := actasmpattern + c;
c := current_scanner.asmgetchar;
end;
uppervar(actasmpattern);
if c = ':' then
begin
case token of
AS_NONE: token := AS_LABEL;
AS_LLABEL: ; { do nothing }
end; { end case }
{ let us point to the next character }
c := current_scanner.asmgetchar;
gettoken := token;
exit;
end;
{ Are we trying to create an identifier with }
{ an at-sign...? }
if forcelabel then
Message(asmr_e_none_label_contain_at);
If is_asmopcode(actasmpattern) then
Begin
gettoken := AS_OPCODE;
exit;
end;
is_asmdirective(actasmpattern, token);
if (token <> AS_NONE) then
Begin
gettoken := token;
exit
end
else
begin
gettoken := AS_NONE;
Message1(asmr_e_invalid_or_missing_opcode,actasmpattern);
end;
end
else { else firsttoken }
{ Here we must handle all possible cases }
begin
case c of
'@': { possiblities : - local label reference , such as in jmp @local1 }
{ - @Result, @Code or @Data special variables. }
begin
actasmpattern := c;
c:= current_scanner.asmgetchar;
while c in ['A'..'Z','a'..'z','0'..'9','_','@','.'] do
begin
actasmpattern := actasmpattern + c;
c := current_scanner.asmgetchar;
end;
uppervar(actasmpattern);
gettoken := AS_ID;
exit;
end;
{ identifier, register, opcode, prefix or directive }
'A'..'Z','a'..'z','_': begin
actasmpattern := c;
c:= current_scanner.asmgetchar;
while c in ['A'..'Z','a'..'z','0'..'9','_','.'] do
begin
actasmpattern := actasmpattern + c;
c := current_scanner.asmgetchar;
end;
uppervar(actasmpattern);
If is_asmopcode(actasmpattern) then
Begin
gettoken := AS_OPCODE;
exit;
end;
is_register(actasmpattern, token);
{is_asmoperator(actasmpattern,token);}
is_asmdirective(actasmpattern,token);
{ if found }
if (token <> AS_NONE) then
begin
gettoken := token;
exit;
end
{ this is surely an identifier }
else
token := AS_ID;
gettoken := token;
exit;
end;
{ override operator... not supported }
'&': begin
c:=current_scanner.asmgetchar;
gettoken := AS_AND;
end;
{ string or character }
'''' :
begin
actasmpattern:='';
while true do
begin
if c = '''' then
begin
c:=current_scanner.asmgetchar;
if c=newline then
begin
Message(scan_f_string_exceeds_line);
break;
end;
repeat
if c=''''then
begin
c:=current_scanner.asmgetchar;
if c='''' then
begin
actasmpattern:=actasmpattern+'''';
c:=current_scanner.asmgetchar;
if c=newline then
begin
Message(scan_f_string_exceeds_line);
break;
end;
end
else break;
end
else
begin
actasmpattern:=actasmpattern+c;
c:=current_scanner.asmgetchar;
if c=newline then
begin
Message(scan_f_string_exceeds_line);
break
end;
end;
until false; { end repeat }
end
else break; { end if }
end; { end while }
token:=AS_STRING;
gettoken := token;
exit;
end;
'$' : begin
c:=current_scanner.asmgetchar;
while c in ['0'..'9','A'..'F','a'..'f'] do
begin
actasmpattern := actasmpattern + c;
c := current_scanner.asmgetchar;
end;
gettoken := AS_HEXNUM;
exit;
end;
',' : begin
gettoken := AS_COMMA;
c:=current_scanner.asmgetchar;
exit;
end;
'(' : begin
gettoken := AS_LPAREN;
c:=current_scanner.asmgetchar;
exit;
end;
')' : begin
gettoken := AS_RPAREN;
c:=current_scanner.asmgetchar;
exit;
end;
':' : begin
gettoken := AS_COLON;
c:=current_scanner.asmgetchar;
exit;
end;
{ '.' : begin
gettoken := AS_DOT;
c:=current_scanner.asmgetchar;
exit;
end; }
'+' : begin
gettoken := AS_PLUS;
c:=current_scanner.asmgetchar;
exit;
end;
'-' : begin
gettoken := AS_MINUS;
c:=current_scanner.asmgetchar;
exit;
end;
'*' : begin
gettoken := AS_STAR;
c:=current_scanner.asmgetchar;
exit;
end;
'/' : begin
gettoken := AS_SLASH;
c:=current_scanner.asmgetchar;
exit;
end;
'<' : begin
c := current_scanner.asmgetchar;
{ invalid characters }
if c <> '<' then
Message(asmr_e_invalid_char_smaller);
{ still assume << }
gettoken := AS_SHL;
c := current_scanner.asmgetchar;
exit;
end;
'>' : begin
c := current_scanner.asmgetchar;
{ invalid characters }
if c <> '>' then
Message(asmr_e_invalid_char_greater);
{ still assume << }
gettoken := AS_SHR;
c := current_scanner.asmgetchar;
exit;
end;
'|' : begin
gettoken := AS_OR;
c := current_scanner.asmgetchar;
exit;
end;
'^' : begin
gettoken := AS_XOR;
c := current_scanner.asmgetchar;
exit;
end;
'#' : begin
gettoken:=AS_APPT;
c:=current_scanner.asmgetchar;
exit;
end;
'%' : begin
c:=current_scanner.asmgetchar;
while c in ['0','1'] do
Begin
actasmpattern := actasmpattern + c;
c := current_scanner.asmgetchar;
end;
gettoken := AS_BINNUM;
exit;
end;
{ integer number }
'0'..'9': begin
actasmpattern := c;
c := current_scanner.asmgetchar;
while c in ['0'..'9'] do
Begin
actasmpattern := actasmpattern + c;
c:= current_scanner.asmgetchar;
end;
gettoken := AS_INTNUM;
exit;
end;
';' : begin
repeat
c:=current_scanner.asmgetchar;
until c=newline;
firsttoken := TRUE;
gettoken:=AS_SEPARATOR;
end;
'{',#13,newline : begin
c:=current_scanner.asmgetchar;
firsttoken := TRUE;
gettoken:=AS_SEPARATOR;
end;
else
Begin
Message(scan_f_illegal_char);
end;
end; { end case }
end; { end else if }
end;
{---------------------------------------------------------------------}
{ Routines for the parsing }
{---------------------------------------------------------------------}
procedure consume(t : tasmtoken);
begin
if t<>actasmtoken then
Message(asmr_e_syntax_error);
actasmtoken:=gettoken;
{ if the token must be ignored, then }
{ get another token to parse. }
if actasmtoken = AS_NONE then
actasmtoken := gettoken;
end;
function findregister(const s : string): tregister;
{*********************************************************************}
{ FUNCTION findregister(s: string):tasmop; }
{ Description: Determines if the s string is a valid register, }
{ if so returns correct tregister token, or R_NO if not found. }
{*********************************************************************}
var
i: tregister;
begin
i.enum:=R_INTREGISTER;
i.number:=regnum_search(s);
if i.number=NR_NO then
begin
findregister.enum := R_NO;
for i.enum:=firstasmreg to lastasmreg do
if s = iasmregs[i.enum] then
begin
findregister := i;
exit;
end;
if s = 'A7' then
begin
findregister.enum := R_SP;
exit;
end;
end
else
findregister:=i;
end;
function findopcode(s: string; var opsize: topsize): tasmop;
{*********************************************************************}
{ FUNCTION findopcode(s: string): tasmop; }
{ Description: Determines if the s string is a valid opcode }
{ if so returns correct tasmop token. }
{*********************************************************************}
var
i: tasmop;
j: byte;
op_size: string;
Begin
findopcode := A_NONE;
j:=pos('.',s);
if j<>0 then
begin
op_size:=copy(s,j+1,1);
case op_size[1] of
{ For the motorola only opsize size is used to }
{ determine the size of the operands. }
'B': opsize := S_B;
'W': opsize := S_W;
'L': opsize := S_L;
'S': opsize := S_FS;
'D': opsize := S_FD;
'X': opsize := S_FX;
else
Message1(asmr_e_unknown_opcode,s);
end;
{ delete everything starting from dot }
delete(s,j,length(s));
end;
for i:=firstop to lastop do
if s = iasmops^[i] then
begin
findopcode:=i;
exit;
end;
end;
Function BuildExpression(allow_symbol : boolean; asmsym : pstring) : longint;
{*********************************************************************}
{ FUNCTION BuildExpression: longint }
{ Description: This routine calculates a constant expression to }
{ a given value. The return value is the value calculated from }
{ the expression. }
{ The following tokens (not strings) are recognized: }
{ (,),SHL,SHR,/,*,NOT,OR,XOR,AND,MOD,+/-,numbers,ID to constants. }
{*********************************************************************}
{ ENTRY: On entry the token should be any valid expression token. }
{ EXIT: On Exit the token points to either COMMA or SEPARATOR }
{ ERROR RECOVERY: Tries to find COMMA or SEPARATOR token by consuming }
{ invalid tokens. }
{*********************************************************************}
var expr: string;
hs, tempstr: string;
sym : tsym;
srsymtable : tsymtable;
hl : tasmlabel;
l : longint;
errorflag: boolean;
Begin
errorflag := FALSE;
expr := '';
tempstr := '';
if allow_symbol then
asmsym^:='';
Repeat
Case actasmtoken of
AS_LPAREN: Begin
Consume(AS_LPAREN);
expr := expr + '(';
end;
AS_RPAREN: Begin
Consume(AS_RPAREN);
expr := expr + ')';
end;
AS_SHL: Begin
Consume(AS_SHL);
expr := expr + '<';
end;
AS_SHR: Begin
Consume(AS_SHR);
expr := expr + '>';
end;
AS_SLASH: Begin
Consume(AS_SLASH);
expr := expr + '/';
end;
AS_MOD: Begin
Consume(AS_MOD);
expr := expr + '%';
end;
AS_STAR: Begin
Consume(AS_STAR);
expr := expr + '*';
end;
AS_PLUS: Begin
Consume(AS_PLUS);
expr := expr + '+';
end;
AS_MINUS: Begin
Consume(AS_MINUS);
expr := expr + '-';
end;
AS_AND: Begin
Consume(AS_AND);
expr := expr + '&';
end;
AS_NOT: Begin
Consume(AS_NOT);
expr := expr + '~';
end;
AS_XOR: Begin
Consume(AS_XOR);
expr := expr + '^';
end;
AS_OR: Begin
Consume(AS_OR);
expr := expr + '|';
end;
AS_ID: Begin
if SearchIConstant(actasmpattern,l) then
Begin
str(l, tempstr);
expr := expr + tempstr;
Consume(AS_ID);
End else
if not allow_symbol then
Begin
Message(asmr_e_syn_constant);
l := 0;
End else
Begin
hs:='';
if (expr[Length(expr)]='+') then
Delete(expr,Length(expr),1)
else if expr<>'' then
Begin
Message(asmr_e_invalid_constant_expression);
break;
End;
tempstr:=actasmpattern;
consume(AS_ID);
if (length(tempstr)>1) and (tempstr[1]='@') then
begin
CreateLocalLabel(tempstr,hl,false);
hs:=hl.name
end
else if SearchLabel(tempstr,hl,false) then
hs:=hl.name
else
begin
searchsym(tempstr,sym,srsymtable);
if assigned(sym) then
begin
case sym.typ of
varsym :
begin
if sym.owner.symtabletype in [localsymtable,parasymtable] then
Message(asmr_e_no_local_or_para_allowed);
hs:=tvarsym(sym).mangledname;
end;
typedconstsym :
hs:=ttypedconstsym(sym).mangledname;
procsym :
begin
if tprocsym(sym).procdef_count>1 then
Message(asmr_w_calling_overload_func);
hs:=tprocsym(sym).first_procdef.mangledname;
end;
typesym :
begin
if not(ttypesym(sym).restype.def.deftype in [recorddef,objectdef]) then
Message(asmr_e_wrong_sym_type);
end;
else
Message(asmr_e_wrong_sym_type);
end;
end
else
Message1(sym_e_unknown_id,tempstr);
end;
{ symbol found? }
if hs<>'' then
begin
if asmsym^='' then
asmsym^:=hs
else
Message(asmr_e_cant_have_multiple_relocatable_symbols);
end;
end;
end;
AS_INTNUM: Begin
expr := expr + actasmpattern;
Consume(AS_INTNUM);
end;
AS_BINNUM: Begin
tempstr := tostr(ValBinary(actasmpattern));
if tempstr = '' then
Message(asmr_e_error_converting_binary);
expr:=expr+tempstr;
Consume(AS_BINNUM);
end;
AS_HEXNUM: Begin
tempstr := tostr(ValHexadecimal(actasmpattern));
if tempstr = '' then
Message(asmr_e_error_converting_hexadecimal);
expr:=expr+tempstr;
Consume(AS_HEXNUM);
end;
AS_OCTALNUM: Begin
tempstr := tostr(ValOctal(actasmpattern));
if tempstr = '' then
Message(asmr_e_error_converting_octal);
expr:=expr+tempstr;
Consume(AS_OCTALNUM);
end;
{ go to next term }
AS_COMMA: Begin
if not ErrorFlag then
BuildExpression := CalculateExpression(expr)
else
BuildExpression := 0;
Exit;
end;
{ go to next symbol }
AS_SEPARATOR: Begin
if not ErrorFlag then
BuildExpression := CalculateExpression(expr)
else
BuildExpression := 0;
Exit;
end;
else
Begin
{ only write error once. }
if not errorflag then
Message(asmr_e_invalid_constant_expression);
{ consume tokens until we find COMMA or SEPARATOR }
Consume(actasmtoken);
errorflag := TRUE;
End;
end;
Until false;
end;
Procedure BuildRealConstant(typ : tfloattype);
{*********************************************************************}
{ PROCEDURE BuilRealConst }
{ Description: This routine calculates a constant expression to }
{ a given value. The return value is the value calculated from }
{ the expression. }
{ The following tokens (not strings) are recognized: }
{ +/-,numbers and real numbers }
{*********************************************************************}
{ ENTRY: On entry the token should be any valid expression token. }
{ EXIT: On Exit the token points to either COMMA or SEPARATOR }
{ ERROR RECOVERY: Tries to find COMMA or SEPARATOR token by consuming }
{ invalid tokens. }
{*********************************************************************}
var expr: string;
r : extended;
code : word;
negativ : boolean;
errorflag: boolean;
Begin
errorflag := FALSE;
Repeat
negativ:=false;
expr := '';
if actasmtoken=AS_PLUS then Consume(AS_PLUS)
else if actasmtoken=AS_MINUS then
begin
negativ:=true;
consume(AS_MINUS);
end;
Case actasmtoken of
AS_INTNUM: Begin
expr := actasmpattern;
Consume(AS_INTNUM);
end;
AS_REALNUM: Begin
expr := actasmpattern;
{ in ATT syntax you have 0d in front of the real }
{ should this be forced ? yes i think so, as to }
{ conform to gas as much as possible. }
if (expr[1]='0') and (upper(expr[2])='D') then
expr:=copy(expr,3,255);
Consume(AS_REALNUM);
end;
AS_BINNUM: Begin
{ checking for real constants with this should use }
{ real DECODING otherwise the compiler will crash! }
Message(asmr_e_invalid_float_expr);
expr:='0.0';
Consume(AS_BINNUM);
end;
AS_HEXNUM: Begin
{ checking for real constants with this should use }
{ real DECODING otherwise the compiler will crash! }
Message(asmr_e_invalid_float_expr);
expr:='0.0';
Consume(AS_HEXNUM);
end;
AS_OCTALNUM: Begin
{ checking for real constants with this should use }
{ real DECODING otherwise the compiler will crash! }
{ xxxToDec using reals could be a solution, but the }
{ problem is that these will crash the m68k compiler }
{ when compiling -- because of lack of good fpu }
{ support. }
Message(asmr_e_invalid_float_expr);
expr:='0.0';
Consume(AS_OCTALNUM);
end;
else
Begin
{ only write error once. }
if not errorflag then
Message(asmr_e_invalid_float_expr);
{ consume tokens until we find COMMA or SEPARATOR }
Consume(actasmtoken);
errorflag := TRUE;
End;
end;
{ go to next term }
if (actasmtoken=AS_COMMA) or (actasmtoken=AS_SEPARATOR) then
Begin
if negativ then expr:='-'+expr;
val(expr,r,code);
if code<>0 then
Begin
r:=0;
Message(asmr_e_invalid_float_expr);
ConcatRealConstant(curlist,r,typ);
End
else
Begin
ConcatRealConstant(curlist,r,typ);
End;
end
else
Message(asmr_e_invalid_float_expr);
Until actasmtoken=AS_SEPARATOR;
end;
Procedure BuildConstant(maxvalue: longint);
{*********************************************************************}
{ PROCEDURE BuildConstant }
{ Description: This routine takes care of parsing a DB,DD,or DW }
{ line and adding those to the assembler node. Expressions, range- }
{ checking are fullly taken care of. }
{ maxvalue: $ff -> indicates that this is a DB node. }
{ $ffff -> indicates that this is a DW node. }
{ $ffffffff -> indicates that this is a DD node. }
{*********************************************************************}
{ EXIT CONDITION: On exit the routine should point to AS_SEPARATOR. }
{*********************************************************************}
var
strlength: byte;
expr: string;
tempstr: string;
value : longint;
Begin
Repeat
Case actasmtoken of
AS_STRING: Begin
if maxvalue = $ff then
strlength := 1
else
Message(asmr_e_string_not_allowed_as_const);
expr := actasmpattern;
if length(expr) > 1 then
Message(asmr_e_string_not_allowed_as_const);
Consume(AS_STRING);
Case actasmtoken of
AS_COMMA: Consume(AS_COMMA);
AS_SEPARATOR: ;
else
Message(asmr_e_invalid_string_expression);
end; { end case }
ConcatString(curlist,expr);
end;
AS_INTNUM,AS_BINNUM,
AS_OCTALNUM,AS_HEXNUM:
Begin
value:=BuildExpression(false,nil);
ConcatConstant(curlist,value,maxvalue);
end;
AS_ID:
Begin
value:=BuildExpression(false,nil);
if value > maxvalue then
Begin
Message(asmr_e_constant_out_of_bounds);
{ assuming a value of maxvalue }
value := maxvalue;
end;
ConcatConstant(curlist,value,maxvalue);
end;
{ These terms can start an assembler expression }
AS_PLUS,AS_MINUS,AS_LPAREN,AS_NOT: Begin
value := BuildExpression(false,nil);
ConcatConstant(curlist,value,maxvalue);
end;
AS_COMMA: BEGIN
Consume(AS_COMMA);
END;
AS_SEPARATOR: ;
else
Begin
Message(asmr_e_syntax_error);
end;
end; { end case }
Until actasmtoken = AS_SEPARATOR;
end;
{****************************************************************************
Tm68kOperand
****************************************************************************}
type
TM68kOperand=class(TOperand)
Procedure BuildOperand;override;
private
labeled : boolean;
Procedure BuildReference;
Function BuildRefExpression: longint;
Procedure BuildScaling;
end;
Procedure TM68kOperand.BuildScaling;
{*********************************************************************}
{ Takes care of parsing expression starting from the scaling value }
{ up to and including possible field specifiers. }
{ EXIT CONDITION: On exit the routine should point to AS_SEPARATOR }
{ or AS_COMMA. On entry should point to the AS_STAR token. }
{*********************************************************************}
var str:string;
l: longint;
code: integer;
Begin
Consume(AS_STAR);
if (opr.ref.scalefactor <> 0)
and (opr.ref.scalefactor <> 1) then
Message(asmr_e_wrong_base_index);
case actasmtoken of
AS_INTNUM: str := actasmpattern;
AS_HEXNUM: str := Tostr(ValHexadecimal(actasmpattern));
AS_BINNUM: str := Tostr(ValBinary(actasmpattern));
AS_OCTALNUM: str := Tostr(ValOctal(actasmpattern));
else
Message(asmr_e_syntax_error);
end;
val(str, l, code);
if code <> 0 then
Message(asmr_e_wrong_scale_factor);
if ((l = 2) or (l = 4) or (l = 8) or (l = 1)) and (code = 0) then
begin
opr.ref.scalefactor := l;
end
else
Begin
Message(asmr_e_wrong_scale_factor);
opr.ref.scalefactor := 0;
end;
if opr.ref.index.enum = R_NO then
Begin
Message(asmr_e_wrong_base_index);
opr.ref.scalefactor := 0;
end;
{ Consume the scaling number }
Consume(actasmtoken);
if actasmtoken = AS_RPAREN then
Consume(AS_RPAREN)
else
Message(asmr_e_wrong_scale_factor);
{ // .Field.Field ... or separator/comma // }
if actasmtoken in [AS_COMMA,AS_SEPARATOR] then
Begin
end
else
Message(asmr_e_syntax_error);
end;
Function TM68kOperand.BuildRefExpression: longint;
{*********************************************************************}
{ FUNCTION BuildRefExpression: longint }
{ Description: This routine calculates a constant expression to }
{ a given value. The return value is the value calculated from }
{ the expression. }
{ The following tokens (not strings) are recognized: }
{ SHL,SHR,/,*,NOT,OR,XOR,AND,MOD,+/-,numbers,ID to constants. }
{*********************************************************************}
{ ENTRY: On entry the token should be any valid expression token. }
{ EXIT: On Exit the token points to the LPAREN token. }
{ ERROR RECOVERY: Tries to find COMMA or SEPARATOR token by consuming }
{ invalid tokens. }
{*********************************************************************}
var tempstr: string;
expr: string;
l : longint;
errorflag : boolean;
Begin
errorflag := FALSE;
tempstr := '';
expr := '';
Repeat
Case actasmtoken of
AS_RPAREN: Begin
Message(asmr_e_syntax_error);
Consume(AS_RPAREN);
end;
AS_SHL: Begin
Consume(AS_SHL);
expr := expr + '<';
end;
AS_SHR: Begin
Consume(AS_SHR);
expr := expr + '>';
end;
AS_SLASH: Begin
Consume(AS_SLASH);
expr := expr + '/';
end;
AS_MOD: Begin
Consume(AS_MOD);
expr := expr + '%';
end;
AS_STAR: Begin
Consume(AS_STAR);
expr := expr + '*';
end;
AS_PLUS: Begin
Consume(AS_PLUS);
expr := expr + '+';
end;
AS_MINUS: Begin
Consume(AS_MINUS);
expr := expr + '-';
end;
AS_AND: Begin
Consume(AS_AND);
expr := expr + '&';
end;
AS_NOT: Begin
Consume(AS_NOT);
expr := expr + '~';
end;
AS_XOR: Begin
Consume(AS_XOR);
expr := expr + '^';
end;
AS_OR: Begin
Consume(AS_OR);
expr := expr + '|';
end;
{ End of reference }
AS_LPAREN: Begin
if not ErrorFlag then
BuildRefExpression := CalculateExpression(expr)
else
BuildRefExpression := 0;
{ no longer in an expression }
exit;
end;
AS_ID:
Begin
if NOT SearchIConstant(actasmpattern,l) then
Begin
Message(asmr_e_syn_constant);
l := 0;
end;
str(l, tempstr);
expr := expr + tempstr;
Consume(AS_ID);
end;
AS_INTNUM: Begin
expr := expr + actasmpattern;
Consume(AS_INTNUM);
end;
AS_BINNUM: Begin
tempstr := Tostr(ValBinary(actasmpattern));
if tempstr = '' then
Message(asmr_e_error_converting_binary);
expr:=expr+tempstr;
Consume(AS_BINNUM);
end;
AS_HEXNUM: Begin
tempstr := Tostr(ValHexadecimal(actasmpattern));
if tempstr = '' then
Message(asmr_e_error_converting_hexadecimal);
expr:=expr+tempstr;
Consume(AS_HEXNUM);
end;
AS_OCTALNUM: Begin
tempstr := Tostr(ValOctal(actasmpattern));
if tempstr = '' then
Message(asmr_e_error_converting_octal);
expr:=expr+tempstr;
Consume(AS_OCTALNUM);
end;
else
Begin
{ write error only once. }
if not errorflag then
Message(asmr_e_invalid_constant_expression);
BuildRefExpression := 0;
if actasmtoken in [AS_COMMA,AS_SEPARATOR] then exit;
{ consume tokens until we find COMMA or SEPARATOR }
Consume(actasmtoken);
errorflag := TRUE;
end;
end;
Until false;
end;
Procedure TM68kOperand.BuildReference;
{*********************************************************************}
{ PROCEDURE BuildBracketExpression }
{ Description: This routine builds up an expression after a LPAREN }
{ token is encountered. }
{ On entry actasmtoken should be equal to AS_LPAREN }
{*********************************************************************}
{ EXIT CONDITION: On exit the routine should point to either the }
{ AS_COMMA or AS_SEPARATOR token. }
{*********************************************************************}
var
l:longint;
code: integer;
str: string;
Begin
Consume(AS_LPAREN);
Case actasmtoken of
{ // (reg ... // }
AS_REGISTER: Begin
opr.ref.base := findregister(actasmpattern);
Consume(AS_REGISTER);
{ can either be a register or a right parenthesis }
{ // (reg) // }
{ // (reg)+ // }
if actasmtoken=AS_RPAREN then
Begin
Consume(AS_RPAREN);
if actasmtoken = AS_PLUS then
Begin
if (opr.ref.direction <> dir_none) then
Message(asmr_e_no_inc_and_dec_together)
else
opr.ref.direction := dir_inc;
Consume(AS_PLUS);
end;
if not (actasmtoken in [AS_COMMA,AS_SEPARATOR]) then
Begin
Message(asmr_e_invalid_reference_syntax);
{ error recovery ... }
while actasmtoken <> AS_SEPARATOR do
Consume(actasmtoken);
end;
exit;
end;
{ // (reg,reg .. // }
Consume(AS_COMMA);
if actasmtoken = AS_REGISTER then
Begin
opr.ref.index :=
findregister(actasmpattern);
Consume(AS_REGISTER);
{ check for scaling ... }
case actasmtoken of
AS_RPAREN:
Begin
Consume(AS_RPAREN);
if not (actasmtoken in [AS_COMMA,AS_SEPARATOR]) then
Begin
{ error recovery ... }
Message(asmr_e_invalid_reference_syntax);
while actasmtoken <> AS_SEPARATOR do
Consume(actasmtoken);
end;
exit;
end;
AS_STAR:
Begin
BuildScaling;
end;
else
Begin
Message(asmr_e_invalid_reference_syntax);
while (actasmtoken <> AS_SEPARATOR) do
Consume(actasmtoken);
end;
end; { end case }
end
else
Begin
Message(asmr_e_invalid_reference_syntax);
while (actasmtoken <> AS_SEPARATOR) do
Consume(actasmtoken);
end;
end;
AS_HEXNUM,AS_OCTALNUM, { direct address }
AS_BINNUM,AS_INTNUM: Begin
case actasmtoken of
AS_INTNUM: str := actasmpattern;
AS_HEXNUM: str := Tostr(ValHexadecimal(actasmpattern));
AS_BINNUM: str := Tostr(ValBinary(actasmpattern));
AS_OCTALNUM: str := Tostr(ValOctal(actasmpattern));
else
Message(asmr_e_syntax_error);
end;
Consume(actasmtoken);
val(str, l, code);
if code <> 0 then
Message(asmr_e_invalid_reference_syntax)
else
opr.ref.offset := l;
Consume(AS_RPAREN);
if not (actasmtoken in [AS_COMMA,AS_SEPARATOR]) then
Begin
{ error recovery ... }
Message(asmr_e_invalid_reference_syntax);
while actasmtoken <> AS_SEPARATOR do
Consume(actasmtoken);
end;
exit;
end;
else
Begin
Message(asmr_e_invalid_reference_syntax);
while (actasmtoken <> AS_SEPARATOR) do
Consume(actasmtoken);
end;
end; { end case }
end;
Procedure TM68kOperand.BuildOperand;
{*********************************************************************}
{ EXIT CONDITION: On exit the routine should point to either the }
{ AS_COMMA or AS_SEPARATOR token. }
{*********************************************************************}
var
tempstr: string;
expr: string;
lab: tasmlabel;
l : longint;
i: Tsuperregister;
r:Tregister;
hl: tasmlabel;
reg_one, reg_two: tregister;
reglist: Tsupregset;
begin
reglist := [];
tempstr := '';
expr := '';
case actasmtoken of
{ // Memory reference // }
AS_LPAREN:
Begin
InitRef;
BuildReference;
end;
{ // Constant expression // }
AS_APPT: Begin
Consume(AS_APPT);
if not (opr.typ in [OPR_NONE,OPR_CONSTANT]) then
Message(asmr_e_invalid_operand_type);
{ identifiers are handled by BuildExpression }
opr.typ := OPR_CONSTANT;
opr.val :=BuildExpression(true,@tempstr);
if tempstr<>'' then
begin
l:=opr.val;
opr.typ := OPR_SYMBOL;
opr.symofs := l;
opr.symbol := objectlibrary.newasmsymbol(tempstr);
end;
end;
{ // Constant memory offset . // }
{ // This must absolutely be followed by ( // }
AS_HEXNUM,AS_INTNUM,
AS_BINNUM,AS_OCTALNUM,AS_PLUS:
Begin
InitRef;
opr.ref.offset:=BuildRefExpression;
BuildReference;
end;
{ // A constant expression, or a Variable ref. // }
AS_ID: Begin
InitRef;
if actasmpattern[1] = '@' then
{ // Label or Special symbol reference // }
Begin
if actasmpattern = '@RESULT' then
SetUpResult
else
if actasmpattern = 'SELF' then
SetUpSelf
else
if (actasmpattern = '@CODE') or (actasmpattern = '@DATA') then
Message(asmr_w_CODE_and_DATA_not_supported)
else
Begin
delete(actasmpattern,1,1);
if actasmpattern = '' then
Message(asmr_e_null_label_ref_not_allowed);
CreateLocalLabel(actasmpattern,lab,false);
opr.typ := OPR_SYMBOL;
opr.symbol := lab;
opr.symofs := 0;
labeled := TRUE;
end;
Consume(AS_ID);
if not (actasmtoken in [AS_SEPARATOR,AS_COMMA]) then
Message(asmr_e_syntax_error);
end
{ probably a variable or normal expression }
{ or a procedure (such as in CALL ID) }
else
Begin
{ is it a constant ? }
if SearchIConstant(actasmpattern,l) then
Begin
InitRef;
opr.ref.offset:=BuildRefExpression;
BuildReference;
end
else { is it a label variable ? }
Begin
{ // ID[ , ID.Field.Field or simple ID // }
{ check if this is a label, if so then }
{ emit it as a label. }
if SearchLabel(actasmpattern,hl,false) then
Begin
opr.typ := OPR_SYMBOL;
opr.symbol := hl;
opr.symofs := 0;
labeled := TRUE;
Consume(AS_ID);
if not (actasmtoken in [AS_SEPARATOR,AS_COMMA]) then
Message(asmr_e_syntax_error);
end
else
{ is it a normal variable ? }
if (cs_compilesystem in aktmoduleswitches) then
begin
if not SetupDirectVar(expr) then
Begin
{ not found, finally ... add it anyways ... }
Message1(asmr_w_id_supposed_external,expr);
opr.ref.symbol:=objectlibrary.newasmsymbol(expr);
end;
end
else
Message1(sym_e_unknown_id,actasmpattern);
expr := actasmpattern;
Consume(AS_ID);
case actasmtoken of
AS_LPAREN: { indexing }
BuildReference;
AS_SEPARATOR,AS_COMMA: ;
else
Message(asmr_e_syntax_error);
end;
end;
end;
end;
{ // Pre-decrement mode reference or constant mem offset. // }
AS_MINUS: Begin
Consume(AS_MINUS);
if actasmtoken = AS_LPAREN then
Begin
InitRef;
{ indicate pre-decrement mode }
opr.ref.direction := dir_dec;
BuildReference;
end
else
if actasmtoken in [AS_OCTALNUM,AS_HEXNUM,AS_BINNUM,AS_INTNUM] then
Begin
InitRef;
opr.ref.offset:=BuildRefExpression;
{ negate because was preceded by a negative sign! }
opr.ref.offset:=-opr.ref.offset;
BuildReference;
end
else
Begin
Message(asmr_e_syntax_error);
while not (actasmtoken in [AS_SEPARATOR,AS_COMMA]) do
Consume(actasmtoken);
end;
end;
{ // Register, a variable reference or a constant reference // }
AS_REGISTER: Begin
{ save the type of register used. }
tempstr := actasmpattern;
Consume(AS_REGISTER);
{ // Simple register // }
if (actasmtoken = AS_SEPARATOR) or (actasmtoken = AS_COMMA) then
Begin
if not (opr.typ in [OPR_NONE,OPR_REGISTER]) then
Message(asmr_e_invalid_operand_type);
opr.typ := OPR_REGISTER;
opr.reg := findregister(tempstr);
end
else
{ HERE WE MUST HANDLE THE SPECIAL CASE OF MOVEM AND FMOVEM }
{ // Individual register listing // }
if (actasmtoken = AS_SLASH) then
Begin
r:=findregister(tempstr);
if r.enum<>R_INTREGISTER then
internalerror(200302191);
reglist := [r.number shr 8];
Consume(AS_SLASH);
if actasmtoken = AS_REGISTER then
Begin
While not (actasmtoken in [AS_SEPARATOR,AS_COMMA]) do
Begin
case actasmtoken of
AS_REGISTER: Begin
r:=findregister(tempstr);
if r.enum<>R_INTREGISTER then
internalerror(200302191);
reglist := reglist + [r.number shr 8];
Consume(AS_REGISTER);
end;
AS_SLASH: Consume(AS_SLASH);
AS_SEPARATOR,AS_COMMA: break;
else
Begin
Message(asmr_e_invalid_reg_list_in_movem);
Consume(actasmtoken);
end;
end; { end case }
end; { end while }
opr.typ:= OPR_REGLIST;
opr.reglist := reglist;
end
else
{ error recovery ... }
Begin
Message(asmr_e_invalid_reg_list_in_movem);
while not (actasmtoken in [AS_SEPARATOR,AS_COMMA]) do
Consume(actasmtoken);
end;
end
else
{ // Range register listing // }
if (actasmtoken = AS_MINUS) then
Begin
Consume(AS_MINUS);
reg_one:=findregister(tempstr);
if actasmtoken <> AS_REGISTER then
Begin
Message(asmr_e_invalid_reg_list_in_movem);
while not (actasmtoken in [AS_SEPARATOR,AS_COMMA]) do
Consume(actasmtoken);
end
else
Begin
{ determine the register range ... }
reg_two:=findregister(actasmpattern);
if reg_two.enum<>R_INTREGISTER then
internalerror(200302191);
if reg_one.enum > reg_two.enum then
for i:=reg_two.number shr 8 to reg_one.number shr 8 do
reglist:=reglist+[i]
else
for i:=reg_one.number shr 8 to reg_two.number shr 8 do
reglist:=reglist+[i];
Consume(AS_REGISTER);
if not (actasmtoken in [AS_SEPARATOR,AS_COMMA]) then
Begin
Message(asmr_e_invalid_reg_list_in_movem);
while not (actasmtoken in [AS_SEPARATOR,AS_COMMA]) do
Consume(actasmtoken);
end;
{ set up instruction }
opr.typ:= OPR_REGLIST;
opr.reglist := reglist;
end;
end
else
{ DIVSL/DIVS/MULS/MULU with long for MC68020 only }
if (actasmtoken = AS_COLON) then
Begin
if (aktoptprocessor = MC68020) or (cs_compilesystem in aktmoduleswitches) then
Begin
Consume(AS_COLON);
if (actasmtoken = AS_REGISTER) then
Begin
{ set up old field, since register is valid }
opr.typ := OPR_REGISTER;
opr.reg := findregister(tempstr);
Inc(operandnum);
opr.typ := OPR_REGISTER;
opr.reg := findregister(actasmpattern);
Consume(AS_REGISTER);
if not (actasmtoken in [AS_SEPARATOR,AS_COMMA]) then
Begin
Message(asmr_e_invalid_reg_list_for_opcode);
while not (actasmtoken in [AS_SEPARATOR,AS_COMMA]) do
Consume(actasmtoken);
end;
end;
end
else
Begin
Message1(asmr_e_higher_cpu_mode_required,'68020');
if not (actasmtoken in [AS_SEPARATOR,AS_COMMA]) then
Begin
Message(asmr_e_invalid_reg_list_for_opcode);
while not (actasmtoken in [AS_SEPARATOR,AS_COMMA]) do
Consume(actasmtoken);
end;
end;
end
else
Message(asmr_e_invalid_register);
end;
AS_SEPARATOR, AS_COMMA: ;
else
Begin
Message(asmr_e_invalid_opcode_and_operand);
Consume(actasmtoken);
end;
end; { end case }
end;
Procedure BuildStringConstant(asciiz: boolean);
{*********************************************************************}
{ PROCEDURE BuildStringConstant }
{ Description: Takes care of a ASCII, or ASCIIZ directive. }
{ asciiz: boolean -> if true then string will be null terminated. }
{*********************************************************************}
{ EXIT CONDITION: On exit the routine should point to AS_SEPARATOR. }
{ On ENTRY: Token should point to AS_STRING }
{*********************************************************************}
var
expr: string;
errorflag : boolean;
Begin
errorflag := FALSE;
Repeat
Case actasmtoken of
AS_STRING: Begin
expr:=actasmpattern;
if asciiz then
expr:=expr+#0;
ConcatPasString(curlist,expr);
Consume(AS_STRING);
end;
AS_COMMA: BEGIN
Consume(AS_COMMA);
END;
AS_SEPARATOR: ;
else
Begin
Consume(actasmtoken);
if not errorflag then
Message(asmr_e_invalid_string_expression);
errorflag := TRUE;
end;
end; { end case }
Until actasmtoken = AS_SEPARATOR;
end;
{*****************************************************************************
TM68kInstruction
*****************************************************************************}
type
TM68kInstruction=class(TInstruction)
procedure InitOperands;override;
procedure BuildOpcode;override;
procedure ConcatInstruction(p : taasmoutput);override;
Procedure ConcatLabeledInstr(p : taasmoutput);
end;
procedure TM68kInstruction.InitOperands;
var
i : longint;
begin
for i:=1 to max_operands do
Operands[i]:=TM68kOperand.Create;
end;
Procedure TM68kInstruction.BuildOpCode;
{*********************************************************************}
{ PROCEDURE BuildOpcode; }
{ Description: Parses the intel opcode and operands, and writes it }
{ in the TInstruction object. }
{*********************************************************************}
{ EXIT CONDITION: On exit the routine should point to AS_SEPARATOR. }
{ On ENTRY: Token should point to AS_OPCODE }
{*********************************************************************}
var asmtok: tasmop;
expr: string;
operandnum : longint;
Begin
expr := '';
asmtok := A_NONE; { assmume no prefix }
{ // opcode // }
{ allow for newline as in gas styled syntax }
{ under DOS you get two AS_SEPARATOR !! }
while actasmtoken=AS_SEPARATOR do
Consume(AS_SEPARATOR);
if (actasmtoken <> AS_OPCODE) then
Begin
Message(asmr_e_invalid_or_missing_opcode);
{ error recovery }
While not (actasmtoken in [AS_SEPARATOR,AS_COMMA]) do
Consume(actasmtoken);
exit;
end
else
Begin
opcode := findopcode(actasmpattern,opsize);
Consume(AS_OPCODE);
{ // Zero operand opcode ? // }
if actasmtoken = AS_SEPARATOR then
exit
else
operandnum := 1;
end;
While actasmtoken <> AS_SEPARATOR do
Begin
case actasmtoken of
{ // Operand delimiter // }
AS_COMMA: Begin
if operandnum > Max_Operands then
Message(asmr_e_too_many_operands)
else
Inc(operandnum);
Consume(AS_COMMA);
end;
{ // End of asm operands for this opcode // }
AS_SEPARATOR: ;
else
Operands[operandnum].BuildOperand;
end; { end case }
end; { end while }
end;
procedure TM68kInstruction.ConcatInstruction(p : taasmoutput);
var
fits : boolean;
Begin
fits := FALSE;
{ setup specific opcodetions for first pass }
{ Setup special operands }
{ Convert to general form as to conform to the m68k opcode table }
if (opcode = A_ADDA) or (opcode = A_ADDI)
then opcode := A_ADD
else
{ CMPM excluded because of GAS v1.34 BUG }
if (opcode = A_CMPA) or
(opcode = A_CMPI) then
opcode := A_CMP
else
if opcode = A_EORI then
opcode := A_EOR
else
if opcode = A_MOVEA then
opcode := A_MOVE
else
if opcode = A_ORI then
opcode := A_OR
else
if (opcode = A_SUBA) or (opcode = A_SUBI) then
opcode := A_SUB;
{ Setup operand types }
(*
in opcode <> A_MOVEM then
Begin
while not(fits) do
begin
{ set the opcodetion cache, if the opcodetion }
{ occurs the first time }
if (it[i].i=opcode) and (ins_cache[opcode]=-1) then
ins_cache[opcode]:=i;
if (it[i].i=opcode) and (instr.ops=it[i].ops) then
begin
{ first fit }
case instr.ops of
0 : begin
fits:=true;
break;
end;
1 :
Begin
if (optyp1 and it[i].o1)<>0 then
Begin
fits:=true;
break;
end;
end;
2 : if ((optyp1 and it[i].o1)<>0) and
((optyp2 and it[i].o2)<>0) then
Begin
fits:=true;
break;
end
3 : if ((optyp1 and it[i].o1)<>0) and
((optyp2 and it[i].o2)<>0) and
((optyp3 and it[i].o3)<>0) then
Begin
fits:=true;
break;
end;
end; { end case }
end; { endif }
if it[i].i=A_NONE then
begin
{ NO MATCH! }
Message(asmr_e_invalid_combination_opcode_and_operand);
exit;
end;
inc(i);
end; { end while }
*)
fits:=TRUE;
{ We add the opcode to the opcode linked list }
if fits then
Begin
case ops of
0:
if opsize <> S_NO then
p.concat((taicpu.op_none(opcode,opsize)))
else
p.concat((taicpu.op_none(opcode,S_NO)));
1: Begin
case operands[1].opr.typ of
OPR_SYMBOL:
Begin
p.concat((taicpu.op_sym_ofs(opcode,
opsize, operands[1].opr.symbol,operands[1].opr.symofs)));
end;
OPR_CONSTANT:
Begin
p.concat((taicpu.op_const(opcode,
opsize, operands[1].opr.val)));
end;
OPR_REGISTER:
p.concat((taicpu.op_reg(opcode,opsize,operands[1].opr.reg)));
OPR_REFERENCE:
if opsize <> S_NO then
Begin
p.concat((taicpu.op_ref(opcode,
opsize,operands[1].opr.ref)));
end
else
Begin
{ special jmp and call case with }
{ symbolic references. }
if opcode in [A_BSR,A_JMP,A_JSR,A_BRA,A_PEA] then
Begin
p.concat((taicpu.op_ref(opcode,
S_NO,operands[1].opr.ref)));
end
else
Message(asmr_e_invalid_opcode_and_operand);
end;
OPR_NONE:
Message(asmr_e_invalid_opcode_and_operand);
else
Begin
Message(asmr_e_invalid_opcode_and_operand);
end;
end;
end;
2: Begin
{ source }
case operands[1].opr.typ of
{ reg,reg }
{ reg,ref }
OPR_REGISTER:
Begin
case operands[2].opr.typ of
OPR_REGISTER:
Begin
p.concat((taicpu.op_reg_reg(opcode,
opsize,operands[1].opr.reg,operands[2].opr.reg)));
end;
OPR_REFERENCE:
p.concat((taicpu.op_reg_ref(opcode,
opsize,operands[1].opr.reg,operands[2].opr.ref)));
else { else case }
Begin
Message(asmr_e_invalid_opcode_and_operand);
end;
end; { end second operand case for OPR_REGISTER }
end;
{ reglist, ref }
OPR_REGLIST:
Begin
case operands[2].opr.typ of
OPR_REFERENCE :
p.concat((taicpu.op_reglist_ref(opcode,
opsize,operands[1].opr.reglist,operands[2].opr.ref)));
else
Begin
Message(asmr_e_invalid_opcode_and_operand);
end;
end; { end second operand case for OPR_REGLIST }
end;
{ const,reg }
{ const,const }
{ const,ref }
OPR_CONSTANT:
case operands[2].opr.typ of
{ constant, constant does not have a specific size. }
OPR_CONSTANT:
p.concat((taicpu.op_const_const(opcode,
S_NO,operands[1].opr.val,operands[2].opr.val)));
OPR_REFERENCE:
Begin
p.concat((taicpu.op_const_ref(opcode,
opsize,operands[1].opr.val,
operands[2].opr.ref)))
end;
OPR_REGISTER:
Begin
p.concat((taicpu.op_const_reg(opcode,
opsize,operands[1].opr.val,
operands[2].opr.reg)))
end;
else
Begin
Message(asmr_e_invalid_opcode_and_operand);
end;
end; { end second operand case for OPR_CONSTANT }
{ ref,reg }
{ ref,ref }
OPR_REFERENCE:
case operands[2].opr.typ of
OPR_REGISTER:
Begin
p.concat((taicpu.op_ref_reg(opcode,
opsize,operands[1].opr.ref,
operands[2].opr.reg)));
end;
OPR_REGLIST:
Begin
p.concat((taicpu.op_ref_reglist(opcode,
opsize,operands[1].opr.ref,
operands[2].opr.reglist)));
end;
OPR_REFERENCE: { special opcodes }
p.concat((taicpu.op_ref_ref(opcode,
opsize,operands[1].opr.ref,
operands[2].opr.ref)));
else
Begin
Message(asmr_e_invalid_opcode_and_operand);
end;
end; { end second operand case for OPR_REFERENCE }
OPR_SYMBOL: case operands[2].opr.typ of
OPR_REFERENCE:
Begin
p.concat((taicpu.op_sym_ofs_ref(opcode,
opsize,operands[1].opr.symbol,operands[1].opr.symofs,
operands[2].opr.ref)))
end;
OPR_REGISTER:
Begin
p.concat((taicpu.op_sym_ofs_reg(opcode,
opsize,operands[1].opr.symbol,operands[1].opr.symofs,
operands[2].opr.reg)))
end;
else
Begin
Message(asmr_e_invalid_opcode_and_operand);
end;
end; { end second operand case for OPR_SYMBOL }
else
Begin
Message(asmr_e_invalid_opcode_and_operand);
end;
end; { end first operand case }
end;
3: Begin
if (opcode = A_DIVSL) or (opcode = A_DIVUL) or (opcode = A_MULU)
or (opcode = A_MULS) or (opcode = A_DIVS) or (opcode = A_DIVU) then
Begin
if (operands[1].opr.typ <> OPR_REGISTER)
or (operands[2].opr.typ <> OPR_REGISTER)
or (operands[3].opr.typ <> OPR_REGISTER) then
Begin
Message(asmr_e_invalid_opcode_and_operand);
end
else
Begin
p.concat((taicpu. op_reg_reg_reg(opcode,opsize,
operands[1].opr.reg,operands[2].opr.reg,operands[3].opr.reg)));
end;
end
else
Message(asmr_e_invalid_opcode_and_operand);
end;
end; { end case }
end;
end;
Procedure TM68kInstruction.ConcatLabeledInstr(p : taasmoutput);
Begin
if ((opcode >= A_BCC) and (opcode <= A_BVS))
or (opcode = A_BRA) or (opcode = A_BSR)
or (opcode = A_JMP) or (opcode = A_JSR)
or ((opcode >= A_FBEQ) and (opcode <= A_FBNGLE))
then
Begin
if ops > 2 then
Message(asmr_e_invalid_opcode_and_operand)
else if operands[1].opr.typ <> OPR_SYMBOL then
Message(asmr_e_invalid_opcode_and_operand)
else if (operands[1].opr.typ = OPR_SYMBOL) and
(ops = 1) then
if assigned(operands[1].opr.symbol) and
(operands[1].opr.symofs=0) then
p.concat(taicpu.op_sym(opcode,S_NO,
operands[1].opr.symbol))
else
Message(asmr_e_invalid_opcode_and_operand);
end
else
if ((opcode >= A_DBCC) and (opcode <= A_DBF))
or ((opcode >= A_FDBEQ) and (opcode <= A_FDBNGLE)) then
begin
if (ops<>2) or
(operands[1].opr.typ <> OPR_REGISTER) or
(operands[2].opr.typ <> OPR_SYMBOL) or
(operands[2].opr.symofs <> 0) then
Message(asmr_e_invalid_opcode_and_operand)
else
p.concat(taicpu.op_reg_sym(opcode,opsize,operands[1].opr.reg,
operands[2].opr.symbol));
end
else
Message(asmr_e_invalid_opcode_and_operand);
end;
Function Assemble: tnode;
{*********************************************************************}
{ PROCEDURE Assemble; }
{ Description: Parses the att assembler syntax, parsing is done }
{ according to GAs rules. }
{*********************************************************************}
Var
hl: tasmlabel;
labelptr,nextlabel : tasmlabel;
commname : string;
instr : TM68kInstruction;
Begin
Message(asmr_d_start_reading);
firsttoken := TRUE;
operandnum := 0;
{ sets up all opcode and register tables in uppercase }
if not _asmsorted then
Begin
SetupTables;
_asmsorted := TRUE;
end;
curlist:=TAAsmoutput.Create;
{ setup label linked list }
LocalLabelList:=TLocalLabelList.Create;
c:=current_scanner.asmgetchar;
actasmtoken:=gettoken;
while actasmtoken<>AS_END do
Begin
case actasmtoken of
AS_LLABEL:
Begin
if CreateLocalLabel(actasmpattern,hl,true) then
ConcatLabel(curlist,hl);
Consume(AS_LLABEL);
end;
AS_LABEL: Begin
{ when looking for Pascal labels, these must }
{ be in uppercase. }
if SearchLabel(upper(actasmpattern),hl,true) then
ConcatLabel(curlist,hl)
else
Begin
Message1(asmr_e_unknown_label_identifier,actasmpattern);
end;
Consume(AS_LABEL);
end;
AS_DW: Begin
Consume(AS_DW);
BuildConstant($ffff);
end;
AS_DB: Begin
Consume(AS_DB);
BuildConstant($ff);
end;
AS_DD: Begin
Consume(AS_DD);
BuildConstant($ffffffff);
end;
AS_XDEF:
Begin
Consume(AS_XDEF);
if actasmtoken=AS_ID then
ConcatPublic(curlist,actasmpattern);
Consume(AS_ID);
if actasmtoken<>AS_SEPARATOR then
Consume(AS_SEPARATOR);
end;
AS_ALIGN: Begin
Message(asmr_w_align_not_supported);
while actasmtoken <> AS_SEPARATOR do
Consume(actasmtoken);
end;
AS_OPCODE: Begin
instr:=TM68kInstruction.Create;
instr.BuildOpcode;
{ instr.AddReferenceSizes;}
{ instr.SetInstructionOpsize;}
{ instr.CheckOperandSizes;}
if instr.labeled then
instr.ConcatLabeledInstr(curlist)
else
instr.ConcatInstruction(curlist);
instr.Free;
{
instr.init;
BuildOpcode;
instr.ops := operandnum;
if instr.labeled then
ConcatLabeledInstr(instr)
else
ConcatOpCode(instr);
instr.done;}
end;
AS_SEPARATOR:Begin
Consume(AS_SEPARATOR);
{ let us go back to the first operand }
operandnum := 0;
end;
AS_END: ; { end assembly block }
else
Begin
Message(asmr_e_syntax_error);
{ error recovery }
Consume(actasmtoken);
end;
end; { end case }
end; { end while }
{ Check LocalLabelList }
LocalLabelList.CheckEmitted;
LocalLabelList.Free;
{ Return the list in an asmnode }
assemble:=casmnode.create(curlist);
Message(asmr_d_finish_reading);
end;
procedure ra68kmot_exit;{$ifndef FPC}far;{$endif}
begin
if assigned(iasmops) then
dispose(iasmops);
exitproc:=old_exit;
end;
Begin
old_exit:=exitproc;
exitproc:=@ra68kmot_exit;
end.
{
$Log: rasm.pas,v $
Revision 1.13 2003/02/19 22:00:16 daniel
* Code generator converted to new register notation
- Horribily outdated todo.txt removed
Revision 1.12 2003/02/12 22:11:13 carl
* some small m68k bugfixes
Revision 1.11 2003/01/08 18:43:57 daniel
* Tregister changed into a record
Revision 1.10 2002/12/14 15:02:03 carl
* maxoperands -> max_operands (for portability in rautils.pas)
* fix some range-check errors with loadconst
+ add ncgadd unit to m68k
* some bugfix of a_param_reg with LOC_CREFERENCE
Revision 1.9 2002/11/30 23:33:03 carl
* merges from Pierre's fixes in m68k fixes branch
Revision 1.8 2002/09/07 15:25:13 peter
* old logs removed and tabs fixed
Revision 1.7 2002/09/03 19:04:18 daniel
* Fixed PowerPC & M68000 compilation
Revision 1.6 2002/08/13 18:58:54 carl
+ m68k problems with cvs fixed?()!
Revision 1.4 2002/08/12 15:08:44 carl
+ stab register indexes for powerpc (moved from gdb to cpubase)
+ tprocessor enumeration moved to cpuinfo
+ linker in target_info is now a class
* many many updates for m68k (will soon start to compile)
- removed some ifdef or correct them for correct cpu
Revision 1.3 2002/08/11 14:32:32 peter
* renamed current_library to objectlibrary
Revision 1.2 2002/08/11 13:24:18 peter
* saving of asmsymbols in ppu supported
* asmsymbollist global is removed and moved into a new class
tasmlibrarydata that will hold the info of a .a file which
corresponds with a single module. Added librarydata to tmodule
to keep the library info stored for the module. In the future the
objectfiles will also be stored to the tasmlibrarydata class
* all getlabel/newasmsymbol and friends are moved to the new class
Revision 1.1 2002/08/06 15:15:42 carl
+ more m68k fixes
}
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