* 6502 compilation fixed

compiler/mos6502/agsdas6500.pas

@@ -0,0 +1,900 @@
+{
+    Copyright (c) 2003 by Florian Klaempfl
+
+    This unit implements an asm for the MOS Technology 6502
+
+    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.
+
+ ****************************************************************************
+}
+{ This unit implements the assembler writer for the sdcc-sdas6502 assembler:
+  http://sdcc.sourceforge.net/
+}
+
+unit agsdas6500;
+
+{$i fpcdefs.inc}
+
+  interface
+
+    uses
+       globtype,systems,
+       aasmbase,aasmtai,aasmdata,aasmcpu,
+       assemble,
+       cpubase;
+
+    type
+
+      { TSdccSdas6500Assembler }
+
+      TSdccSdas6500Assembler=class(TExternalAssembler)
+      private
+        procedure WriteRealConstAsBytes(hp: tai_realconst; const dbdir: string; do_line: boolean);
+        function sectionname(atype:TAsmSectiontype;const aname:string;aorder:TAsmSectionOrder):string;
+        procedure WriteSection(atype:TAsmSectiontype;const aname:string;aorder:TAsmSectionOrder;secalign:longint;
+          secflags:TSectionFlags=[];secprogbits:TSectionProgbits=SPB_None);
+        procedure WriteInstruction(hp: taicpu);
+        procedure WriteOper(const o:toper; opcode: tasmop;ops:longint;dest : boolean);
+        procedure WriteOper_jmp(const o:toper; ai : taicpu);
+        procedure WriteExternals;
+      public
+        procedure WriteTree(p : TAsmList); override;
+        procedure WriteAsmList;override;
+        function MakeCmdLine: TCmdStr; override;
+      end;
+
+  implementation
+
+    uses
+       cutils,globals,verbose,
+       cpuinfo,
+       cgbase,cgutils,
+{$ifdef FPC_SOFT_FPUX80}
+       sfpux80,
+{$endif FPC_SOFT_FPUX80}
+       finput;
+
+    const
+      line_length = 70;
+      max_tokens : longint = 25;
+      ait_const2str : array[aitconst_128bit..aitconst_64bit_unaligned] of string[20]=(
+        #9''#9,#9'FIXMEDQ'#9,#9'FIXMEDD'#9,#9'.dw'#9,#9'.db'#9,
+        #9'FIXMESLEB',#9'FIXEMEULEB',
+        #9'FIXMEDD RVA'#9,#9'FIXMEDD SECREL32'#9,
+        #9'FIXME',#9'FIXME',#9'FIXME',#9'FIXME',
+        #9'.dw'#9,#9'FIXMEDD'#9,#9'FIXMEDQ'#9
+      );
+
+    procedure TSdccSdas6500Assembler.WriteRealConstAsBytes(hp: tai_realconst; const dbdir: string; do_line: boolean);
+      var
+        pdata: pbyte;
+        index, step, swapmask, count: longint;
+        ssingle: single;
+        ddouble: double;
+        ccomp: comp;
+{$if defined(cpuextended) and defined(FPC_HAS_TYPE_EXTENDED)}
+        eextended: extended;
+{$else}
+{$ifdef FPC_SOFT_FPUX80}
+	eextended: floatx80;
+{$endif}
+{$endif cpuextended}
+      begin
+        if do_line then
+          begin
+            case tai_realconst(hp).realtyp of
+              aitrealconst_s32bit:
+                writer.AsmWriteLn(asminfo^.comment+'value: '+single2str(tai_realconst(hp).value.s32val));
+              aitrealconst_s64bit:
+                writer.AsmWriteLn(asminfo^.comment+'value: '+double2str(tai_realconst(hp).value.s64val));
+{$if defined(cpuextended) and defined(FPC_HAS_TYPE_EXTENDED)}
+              { can't write full 80 bit floating point constants yet on non-x86 }
+              aitrealconst_s80bit:
+                writer.AsmWriteLn(asminfo^.comment+'value: '+extended2str(tai_realconst(hp).value.s80val));
+{$else}
+{$ifdef FPC_SOFT_FPUX80}
+{$push}{$warn 6018 off} { Unreachable code due to compile time evaluation }
+             aitrealconst_s80bit:
+               begin
+     	         if sizeof(tai_realconst(hp).value.s80val) = sizeof(double) then
+                   writer.AsmWriteLn(asminfo^.comment+'value: '+double2str(tai_realconst(hp).value.s80val))
+     	         else if sizeof(tai_realconst(hp).value.s80val) = sizeof(single) then
+                   writer.AsmWriteLn(asminfo^.comment+'value: '+single2str(tai_realconst(hp).value.s80val))
+                else
+     	         internalerror(2017091904);
+       	      end;
+{$pop}
+{$endif}
+{$endif cpuextended}
+              aitrealconst_s64comp:
+                writer.AsmWriteLn(asminfo^.comment+'value: '+extended2str(tai_realconst(hp).value.s64compval));
+              else
+                internalerror(2014050601);
+            end;
+          end;
+        writer.AsmWrite(dbdir);
+        { generic float writing code: get start address of value, then write
+          byte by byte. Can't use fields directly, because e.g ts64comp is
+          defined as extended on x86 }
+        case tai_realconst(hp).realtyp of
+          aitrealconst_s32bit:
+            begin
+              ssingle:=single(tai_realconst(hp).value.s32val);
+              pdata:=@ssingle;
+            end;
+          aitrealconst_s64bit:
+            begin
+              ddouble:=double(tai_realconst(hp).value.s64val);
+              pdata:=@ddouble;
+            end;
+{$if defined(cpuextended) and defined(FPC_HAS_TYPE_EXTENDED)}
+          { can't write full 80 bit floating point constants yet on non-x86 }
+          aitrealconst_s80bit:
+            begin
+              eextended:=extended(tai_realconst(hp).value.s80val);
+              pdata:=@eextended;
+            end;
+{$else}
+{$ifdef FPC_SOFT_FPUX80}
+{$push}{$warn 6018 off} { Unreachable code due to compile time evaluation }
+          aitrealconst_s80bit:
+            begin
+	      if sizeof(tai_realconst(hp).value.s80val) = sizeof(double) then
+                eextended:=float64_to_floatx80(float64(double(tai_realconst(hp).value.s80val)))
+	      else if sizeof(tai_realconst(hp).value.s80val) = sizeof(single) then
+	        eextended:=float32_to_floatx80(float32(single(tai_realconst(hp).value.s80val)))
+	      else
+	        internalerror(2017091905);
+              pdata:=@eextended;
+            end;
+{$pop}
+{$endif}
+{$endif cpuextended}
+          aitrealconst_s64comp:
+            begin
+              ccomp:=comp(tai_realconst(hp).value.s64compval);
+              pdata:=@ccomp;
+            end;
+          else
+            internalerror(2014051002);
+        end;
+        count:=tai_realconst(hp).datasize;
+        { write bytes in inverse order if source and target endianess don't
+          match }
+        if source_info.endian<>target_info.endian then
+          begin
+            { go from back to front }
+            index:=count-1;
+            step:=-1;
+          end
+        else
+          begin
+            index:=0;
+            step:=1;
+          end;
+{$ifdef ARM}
+        { ARM-specific: low and high dwords of a double may be swapped }
+        if tai_realconst(hp).formatoptions=fo_hiloswapped then
+          begin
+            { only supported for double }
+            if tai_realconst(hp).datasize<>8 then
+              internalerror(2014050607);
+            { switch bit of the index so that the words are written in
+              the opposite order }
+            swapmask:=4;
+          end
+        else
+{$endif ARM}
+          swapmask:=0;
+        repeat
+          writer.AsmWrite(tostr(pdata[index xor swapmask]));
+          inc(index,step);
+          dec(count);
+          if count<>0 then
+            writer.AsmWrite(',');
+        until count=0;
+        { padding }
+        for count:=tai_realconst(hp).datasize+1 to tai_realconst(hp).savesize do
+          writer.AsmWrite(',0');
+        writer.AsmLn;
+      end;
+
+    function TSdccSdas6500Assembler.sectionname(atype: TAsmSectiontype;
+        const aname: string; aorder: TAsmSectionOrder): string;
+      const
+        secnames : array[TAsmSectiontype] of string[length('__DATA, __datacoal_nt,coalesced')] = ('','',
+          '_CODE',
+          '_DATA',
+          '_DATA',
+          '_DATA',
+          '_BSS',
+          '.threadvar',
+          '.pdata',
+          '', { stubs }
+          '__DATA,__nl_symbol_ptr',
+          '__DATA,__la_symbol_ptr',
+          '__DATA,__mod_init_func',
+          '__DATA,__mod_term_func',
+          '.stab',
+          '.stabstr',
+          '.idata$2','.idata$4','.idata$5','.idata$6','.idata$7','.edata',
+          '.eh_frame',
+          '.debug_frame','.debug_info','.debug_line','.debug_abbrev','.debug_aranges','.debug_ranges','.debug_loc','.debug_loclists',
+          '.fpc',
+          '.toc',
+          '.init',
+          '.fini',
+          '.objc_class',
+          '.objc_meta_class',
+          '.objc_cat_cls_meth',
+          '.objc_cat_inst_meth',
+          '.objc_protocol',
+          '.objc_string_object',
+          '.objc_cls_meth',
+          '.objc_inst_meth',
+          '.objc_cls_refs',
+          '.objc_message_refs',
+          '.objc_symbols',
+          '.objc_category',
+          '.objc_class_vars',
+          '.objc_instance_vars',
+          '.objc_module_info',
+          '.objc_class_names',
+          '.objc_meth_var_types',
+          '.objc_meth_var_names',
+          '.objc_selector_strs',
+          '.objc_protocol_ext',
+          '.objc_class_ext',
+          '.objc_property',
+          '.objc_image_info',
+          '.objc_cstring_object',
+          '.objc_sel_fixup',
+          '__DATA,__objc_data',
+          '__DATA,__objc_const',
+          '.objc_superrefs',
+          '__DATA, __datacoal_nt,coalesced',
+          '.objc_classlist',
+          '.objc_nlclasslist',
+          '.objc_catlist',
+          '.obcj_nlcatlist',
+          '.objc_protolist',
+          '_STACK',
+          '_HEAP',
+          '.gcc_except_table',
+          '.ARM.attributes'
+        );
+      begin
+        if atype=sec_user then
+          result:=aname
+        else
+          result:=secnames[atype];
+      end;
+
+    procedure TSdccSdas6500Assembler.WriteSection(atype: TAsmSectiontype;
+        const aname: string; aorder: TAsmSectionOrder; secalign: longint;
+        secflags: TSectionFlags; secprogbits: TSectionProgbits);
+      var
+        s : string;
+        secflag: TSectionFlag;
+        sectionprogbits,
+        sectionflags: boolean;
+      begin
+        writer.AsmLn;
+        sectionflags:=false;
+        sectionprogbits:=false;
+        writer.AsmWrite(#9'.area ');
+        { sectionname may rename those sections, so we do not write flags/progbits for them,
+          the assembler will ignore them/spite out a warning anyways }
+        if not(atype in [sec_data,sec_rodata,sec_rodata_norel]) then
+          begin
+            sectionflags:=true;
+            sectionprogbits:=true;
+          end;
+        s:=sectionname(atype,aname,aorder);
+        writer.AsmWrite(s);
+        writer.AsmLn;
+        LastSecType:=atype;
+      end;
+
+    procedure TSdccSdas6500Assembler.WriteInstruction(hp: taicpu);
+      var
+        i: Integer;
+      begin
+        writer.AsmWrite(#9#9+std_op2str[hp.opcode]);
+        if (taicpu(hp).ops<>0) or (hp.condition<>C_None) then
+          begin
+            writer.AsmWrite(#9);
+            if hp.condition<>C_None then
+              begin
+                writer.AsmWrite(uppercond2str[hp.condition]);
+                if taicpu(hp).ops<>0 then
+                  writer.AsmWrite(',');
+              end;
+            for i:=0 to taicpu(hp).ops-1 do
+              begin
+                if i<>0 then
+                  writer.AsmWrite(',');
+                if is_calljmp(hp.opcode) then
+                  WriteOper_jmp(taicpu(hp).oper[i]^,hp)
+                else
+                  WriteOper(taicpu(hp).oper[i]^,hp.opcode,taicpu(hp).ops,(i=2));
+              end;
+          end;
+        writer.AsmLn;
+      end;
+
+    procedure TSdccSdas6500Assembler.WriteOper(const o: toper; opcode: tasmop; ops: longint; dest: boolean);
+      var
+        need_plus: Boolean;
+      begin
+        case o.typ of
+          top_reg :
+            writer.AsmWrite(std_regname(o.reg));
+          top_const :
+            begin
+              writer.AsmWrite('#'+tostr(longint(o.val)));
+            end;
+          top_ref:
+            begin
+              //if assigned(o.ref^.symbol) and (o.ref^.refaddr in [addr_lo8,addr_hi8,addr_full]) then
+              //  begin
+              //    {if SmartAsm then
+              //      AddSymbol(o.ref^.symbol.name,false);}
+              //    if (o.ref^.base<>NR_NO) or (o.ref^.index<>NR_NO) then
+              //      internalerror(2020041101);
+              //    writer.AsmWrite('#');
+              //    case o.ref^.refaddr of
+              //      addr_lo8:
+              //        writer.AsmWrite('<');
+              //      addr_hi8:
+              //        writer.AsmWrite('>');
+              //      addr_full:
+              //        {nothing};
+              //      else
+              //        ;
+              //    end;
+              //    if o.ref^.offset<>0 then
+              //      writer.AsmWrite('('+ApplyAsmSymbolRestrictions(o.ref^.symbol.name)+'+'+tostr(o.ref^.offset)+')')
+              //    else
+              //      writer.AsmWrite(ApplyAsmSymbolRestrictions(o.ref^.symbol.name));
+              //  end
+              //else if not assigned(o.ref^.symbol) and
+              //   ((o.ref^.base<>NR_NO) or (o.ref^.index<>NR_NO)) and
+              //   (o.ref^.offset<>0) then
+              //  begin
+              //    { sdasz80 doesn't range check the offset d in the (IX+d) and
+              //      (IY+d) addressing modes, but instead truncates it to
+              //      shortint, introducing silent bugs, and prevents us from
+              //      catching bugs in the code generator during compilation }
+              //    if ((o.ref^.base<>NR_NO) or (o.ref^.index<>NR_NO)) and
+              //       ((o.ref^.offset<-128) or (o.ref^.offset>127)) then
+              //      internalerror(2020042805);
+              //    writer.AsmWrite(tostr(o.ref^.offset));
+              //    writer.AsmWrite(' (');
+              //    if o.ref^.base<>NR_NO then
+              //      begin
+              //        if o.ref^.index<>NR_NO then
+              //          internalerror(2020040201);
+              //        writer.AsmWrite(std_regname(o.ref^.base));
+              //      end
+              //    else if o.ref^.index<>NR_NO then
+              //      begin
+              //        if o.ref^.scalefactor>1 then
+              //          internalerror(2020040202);
+              //        writer.AsmWrite(std_regname(o.ref^.index));
+              //      end;
+              //    writer.AsmWrite(')');
+              //  end
+              //else
+              //  begin
+              //    writer.AsmWrite('(');
+              //    need_plus:=false;
+              //    if o.ref^.base<>NR_NO then
+              //      begin
+              //        if o.ref^.index<>NR_NO then
+              //          internalerror(2020040203);
+              //        writer.AsmWrite(std_regname(o.ref^.base));
+              //        need_plus:=true;
+              //      end
+              //    else if o.ref^.index<>NR_NO then
+              //      begin
+              //        if o.ref^.scalefactor>1 then
+              //          internalerror(2020040206);
+              //        writer.AsmWrite(std_regname(o.ref^.index));
+              //        need_plus:=true;
+              //      end;
+              //    if assigned(o.ref^.symbol) then
+              //      begin
+              //        {if SmartAsm then
+              //          AddSymbol(o.ref^.symbol.name,false);}
+              //        if need_plus then
+              //          writer.AsmWrite('+');
+              //        writer.AsmWrite(ApplyAsmSymbolRestrictions(o.ref^.symbol.name));
+              //        need_plus:=true;
+              //      end;
+              //    if o.ref^.offset<>0 then
+              //      begin
+              //        if need_plus and (o.ref^.offset>0) then
+              //          writer.AsmWrite('+');
+              //        writer.AsmWrite(tostr(o.ref^.offset));
+              //        need_plus:=true;
+              //      end;
+              //    if not need_plus then
+              //      writer.AsmWrite('0');
+              //    writer.AsmWrite(')');
+              //  end;
+            end;
+          else
+            internalerror(2020100803);
+        end;
+      end;
+
+    procedure TSdccSdas6500Assembler.WriteOper_jmp(const o: toper; ai: taicpu);
+      begin
+        case o.typ of
+          top_reg :
+            writer.AsmWrite(std_regname(o.reg));
+          top_const :
+            begin
+              writer.AsmWrite('#'+tostr(longint(o.val)));
+            end;
+          top_ref:
+            begin
+              if o.ref^.refaddr=addr_no then
+                begin
+                  writer.AsmWrite('TODO:indirect jump ref');
+                  //WriteReference(o.ref^);
+                end
+              else
+                begin
+                  writer.AsmWrite(ApplyAsmSymbolRestrictions(o.ref^.symbol.name));
+                  //if SmartAsm then
+                  //  AddSymbol(o.ref^.symbol.name,false);
+                  if o.ref^.offset>0 then
+                   writer.AsmWrite('+'+tostr(o.ref^.offset))
+                  else
+                   if o.ref^.offset<0 then
+                    writer.AsmWrite(tostr(o.ref^.offset));
+                end;
+            end;
+          else
+            internalerror(2020100804);
+        end;
+      end;
+
+    procedure TSdccSdas6500Assembler.WriteExternals;
+      var
+        sym : TAsmSymbol;
+        i   : longint;
+      begin
+        writer.AsmWriteln('; Begin externals');
+        for i:=0 to current_asmdata.AsmSymbolDict.Count-1 do
+          begin
+            sym:=TAsmSymbol(current_asmdata.AsmSymbolDict[i]);
+            if sym.bind in [AB_EXTERNAL,AB_EXTERNAL_INDIRECT] then
+              writer.AsmWriteln(#9'.globl'#9+ApplyAsmSymbolRestrictions(sym.name));
+          end;
+        writer.AsmWriteln('; End externals');
+      end;
+
+    procedure TSdccSdas6500Assembler.WriteTree(p: TAsmList);
+
+      procedure doalign(alignment: byte; use_op: boolean; fillop: byte; maxbytes: byte; out last_align: longint;lasthp:tai);
+        var
+          i: longint;
+          alignment64 : int64;
+        begin
+          last_align:=alignment;
+          if alignment>1 then
+            writer.AsmWriteLn(#9'.bndry '+tostr(alignment));
+        end;
+
+    var
+      lasthp,
+      hp: tai;
+      s, sb, LastSecName: string;
+      counter,lines,i,j,l,tokens,pos,last_align: longint;
+      quoted, do_line: Boolean;
+      consttype: taiconst_type;
+      ch: Char;
+      InlineLevel : longint;
+      prevfileinfo : tfileposinfo;
+      previnfile : tinputfile;
+      LastAlign: Integer;
+      LastSecOrder: TAsmSectionOrder;
+    begin
+      if not assigned(p) then
+       exit;
+      InlineLevel:=0;
+      last_align:=1;
+      lasthp:=nil;
+      { lineinfo is only needed for al_procedures (PFV) }
+      do_line:=(cs_asm_source in current_settings.globalswitches) or
+               ((cs_lineinfo in current_settings.moduleswitches)
+                 and (p=current_asmdata.asmlists[al_procedures]));
+      hp:=tai(p.first);
+      while assigned(hp) do
+        begin
+          prefetch(pointer(hp.next)^);
+          if not(hp.typ in SkipLineInfo) then
+            begin
+              previnfile:=lastinfile;
+              prevfileinfo:=lastfileinfo;
+              current_filepos:=tailineinfo(hp).fileinfo;
+
+              { no line info for inlined code }
+              if do_line and (inlinelevel=0) then
+                WriteSourceLine(hp as tailineinfo);
+              (*if (lastfileinfo.line<>prevfileinfo.line) or
+                 (previnfile<>lastinfile) then
+                begin
+                  { +0 postfix means no line increment per assembler instruction }
+                  writer.AsmWrite('%LINE '+tostr(current_filepos.line)+'+0');
+                  if assigned(lastinfile) and ((previnfile<>lastinfile) or NewObject) then
+                    writer.AsmWriteLn(' '+lastinfile.name)
+                  else
+                    writer.AsmLn;
+                  NewObject:=false;
+                end;*)
+            end;
+          case hp.typ of
+            ait_section :
+              begin
+                ResetSourceLines;
+
+                if tai_section(hp).sectype<>sec_none then
+                  WriteSection(tai_section(hp).sectype,tai_section(hp).name^,tai_section(hp).secorder,
+                    tai_section(hp).secalign,tai_section(hp).secflags,tai_section(hp).secprogbits)
+                else
+                  begin
+{$ifdef EXTDEBUG}
+                    writer.AsmWrite(asminfo^.comment);
+                    writer.AsmWriteln(' sec_none');
+{$endif EXTDEBUG}
+                 end;
+              end;
+            ait_align :
+              begin
+                doalign(tai_align_abstract(hp).aligntype,tai_align_abstract(hp).use_op,tai_align_abstract(hp).fillop,tai_align_abstract(hp).maxbytes,last_align,lasthp);
+              end;
+            ait_label :
+              begin
+                if tai_label(hp).labsym.is_used then
+                  begin
+                    writer.AsmWrite(ApplyAsmSymbolRestrictions(tai_label(hp).labsym.name));
+                    if tai_label(hp).labsym.bind in [AB_GLOBAL,AB_PRIVATE_EXTERN] then
+                      writer.AsmWriteLn('::')
+                    else
+                      writer.AsmWriteLn(':');
+                  end;
+              end;
+            ait_symbol :
+              begin
+                if not(tai_symbol(hp).has_value) then
+                  begin
+                    if tai_symbol(hp).is_global then
+                      writer.AsmWriteLn(ApplyAsmSymbolRestrictions(tai_symbol(hp).sym.name) + '::')
+                    else
+                      writer.AsmWriteLn(ApplyAsmSymbolRestrictions(tai_symbol(hp).sym.name) + ':');
+                  end
+                else
+                  begin
+                    if tai_symbol(hp).is_global then
+                      writer.AsmWriteLn(ApplyAsmSymbolRestrictions(tai_symbol(hp).sym.name) + '==' + tostr(tai_symbol(hp).value))
+                    else
+                      writer.AsmWriteLn(ApplyAsmSymbolRestrictions(tai_symbol(hp).sym.name) + '=' + tostr(tai_symbol(hp).value));
+                  end;
+              end;
+            ait_symbol_end :
+              begin
+              end;
+            ait_datablock :
+              begin
+                if tai_datablock(hp).is_global or SmartAsm then
+                  writer.AsmWrite(ApplyAsmSymbolRestrictions(tai_datablock(hp).sym.name) + '::')
+                else
+                  writer.AsmWrite(ApplyAsmSymbolRestrictions(tai_datablock(hp).sym.name) + ':');
+                {if SmartAsm then
+                  AddSymbol(tai_datablock(hp).sym.name,true);}
+                writer.AsmWriteLn(#9'.rs'#9+tostr(tai_datablock(hp).size));
+              end;
+            ait_realconst:
+              WriteRealConstAsBytes(tai_realconst(hp),#9'.db'#9,do_line);
+            ait_const:
+              begin
+                consttype:=tai_const(hp).consttype;
+                case consttype of
+                  aitconst_uleb128bit:
+                    writer.AsmWriteLn(ait_const2str[aitconst_8bit]+uleb128tostr(qword(tai_const(hp).value)));
+                  aitconst_sleb128bit:
+                    writer.AsmWriteLn(ait_const2str[aitconst_8bit]+sleb128tostr(tai_const(hp).value));
+                  aitconst_64bit,
+                  aitconst_64bit_unaligned,
+                  aitconst_32bit,
+                  aitconst_32bit_unaligned:
+                    begin
+                      writer.AsmWrite(#9'.dw'#9);
+                      l:=0;
+ 		      tokens:=1;
+                      repeat
+                        if assigned(tai_const(hp).sym) then
+                          begin
+                            if assigned(tai_const(hp).endsym) then
+                              s:=ApplyAsmSymbolRestrictions(tai_const(hp).endsym.name)+'-'+ApplyAsmSymbolRestrictions(tai_const(hp).sym.name)
+                            else
+                              s:=ApplyAsmSymbolRestrictions(tai_const(hp).sym.name);
+                            if tai_const(hp).value<>0 then
+                              s:=s+tostr_with_plus(tai_const(hp).value);
+                            if consttype in [aitconst_64bit,aitconst_64bit_unaligned] then
+                              s:=s+',0,0,0'
+                            else
+                              s:=s+',0';
+                          end
+                        else
+                          if consttype in [aitconst_64bit,aitconst_64bit_unaligned] then
+                            s:=tostr(Word(tai_const(hp).value))       +','+tostr(Word(tai_const(hp).value shr 16))+','+
+                               tostr(Word(tai_const(hp).value shr 32))+','+tostr(Word(tai_const(hp).value shr 48))
+                          else
+                            s:=tostr(Word(tai_const(hp).value))+','+tostr(Word(tai_const(hp).value shr 16));
+                        writer.AsmWrite(s);
+                        inc(l,length(s));
+ 		        inc(tokens);
+                        if (l>line_length) or
+                           (tokens>max_tokens) or
+                           (hp.next=nil) or
+                           (tai(hp.next).typ<>ait_const) or
+                           (tai_const(hp.next).consttype<>consttype) then
+                          break;
+                        hp:=tai(hp.next);
+                        writer.AsmWrite(',');
+                      until false;
+                      { Substract section start for secrel32 type }
+                      {if consttype=aitconst_secrel32_symbol then
+                        writer.AsmWrite(' - $$');}
+                      writer.AsmLn;
+                    end;
+                  {aitconst_128bit,}
+                  aitconst_16bit,
+                  aitconst_8bit,
+                  aitconst_16bit_unaligned{,
+                  aitconst_rva_symbol,
+                  aitconst_secrel32_symbol} :
+                    begin
+                      writer.AsmWrite(ait_const2str[consttype]);
+                      l:=0;
+ 		      tokens:=1;
+                      repeat
+                        if assigned(tai_const(hp).sym) then
+                          begin
+                            if assigned(tai_const(hp).endsym) then
+                              s:=ApplyAsmSymbolRestrictions(tai_const(hp).endsym.name)+'-'+ApplyAsmSymbolRestrictions(tai_const(hp).sym.name)
+                            else
+                              s:=ApplyAsmSymbolRestrictions(tai_const(hp).sym.name);
+                            if tai_const(hp).value<>0 then
+                              s:=s+tostr_with_plus(tai_const(hp).value);
+                          end
+                        else
+                          s:=tostr(tai_const(hp).value);
+                        writer.AsmWrite(s);
+                        inc(l,length(s));
+ 		        inc(tokens);
+                        if (l>line_length) or
+                           (tokens>max_tokens) or
+                           (hp.next=nil) or
+                           (tai(hp.next).typ<>ait_const) or
+                           (tai_const(hp.next).consttype<>consttype) then
+                          break;
+                        hp:=tai(hp.next);
+                        writer.AsmWrite(',');
+                      until false;
+                      { Substract section start for secrel32 type }
+                      if consttype=aitconst_secrel32_symbol then
+                        writer.AsmWrite(' - $$');
+                      writer.AsmLn;
+                    end;
+                  else
+                    begin
+                      writer.AsmWrite(asminfo^.comment);
+                      writer.AsmWrite('WARNING: not yet implemented in assembler output: ');
+                      Str(consttype,s);
+                      writer.AsmWriteLn(s);
+                    end;
+                end;
+              end;
+            ait_string :
+              begin
+                pos:=0;
+		s:='';
+                sb:='';
+                for i:=1 to tai_string(hp).len do
+                  begin
+                    ch:=tai_string(hp).str[i-1];
+		    if ch in [#32..chr(ord('"')-1),char(ord('"')+1)..#127] then
+                      begin
+                        if sb<>'' then
+                          begin
+                            writer.AsmWriteln(sb);
+                            sb:='';
+                            pos:=0;
+                          end;
+                        if pos=0 then
+                          begin
+                            s:=#9'.ascii'#9'"'+ch;
+                            pos:=20;
+                          end
+		        else
+                          begin
+                            s:=s+ch;
+                            inc(pos);
+                          end;
+                      end
+                    else
+                      begin
+                        if s<>'' then
+                          begin
+                            writer.AsmWriteln(s+'"');
+                            s:='';
+                            pos:=0;
+                          end;
+                        if pos=0 then
+                          begin
+                            sb:=#9'.byte'#9+tostr(ord(ch));
+                            pos:=15;
+                          end
+		        else
+                          begin
+                            sb:=sb+','+tostr(ord(ch));
+                            inc(pos,4);
+			  end;
+                      end;
+                    if (pos>line_length) or (i=tai_string(hp).len) then
+                      begin
+                        if s<>'' then
+                          begin
+                            writer.AsmWriteLn(s+'"');
+                            s:='';
+                          end
+                        else if sb<>'' then
+                          begin
+                            writer.AsmWriteLn(sb);
+                            sb:='';
+                          end;
+                        pos:=0;
+                      end;
+                  end;
+              end;
+            ait_instruction :
+              begin
+                WriteInstruction(taicpu(hp));
+              end;
+            ait_directive :
+              begin
+                case tai_directive(hp).directive of
+                  asd_cpu :
+                    writer.AsmWriteLn('; CPU '+tai_directive(hp).name);
+                  else
+                    begin
+                      writer.AsmWrite(asminfo^.comment);
+                      writer.AsmWrite('WARNING: not yet implemented in assembler output: ait_directive.');
+                      Str(tai_directive(hp).directive,s);
+                      writer.AsmWriteLn(s);
+                    end;
+                end;
+              end;
+            ait_cutobject :
+              begin
+                if SmartAsm then
+                 begin
+                  { only reset buffer if nothing has changed }
+                  if not writer.ClearIfEmpty then
+                   begin
+                     {if SmartAsm then
+                       begin
+                         WriteSmartExternals;
+                         FreeExternChainList;
+                       end;
+                     WriteGroups;}
+                     writer.AsmClose;
+                     DoAssemble;
+                     writer.AsmCreate(tai_cutobject(hp).place);
+                     {ResetSectionsList;
+                     WriteHeader;}
+                   end;
+                { avoid empty files }
+                  LastSecType:=sec_none;
+                  LastSecName:='';
+                  LastSecOrder:=secorder_default;
+                  LastAlign:=1;
+                  while assigned(hp.next) and (tai(hp.next).typ in [ait_cutobject,ait_section,ait_comment]) do
+                   begin
+                     if tai(hp.next).typ=ait_section then
+                       begin
+                         LastSecType:=tai_section(hp.next).sectype;
+                         LastSecName:=tai_section(hp.next).name^;
+                         LastSecOrder:=tai_section(hp.next).secorder;
+                         LastAlign:=tai_section(hp.next).secalign;
+                       end;
+                     hp:=tai(hp.next);
+                   end;
+                  if LastSecType<>sec_none then
+                    WriteSection(LastSecType,LastSecName,LastSecOrder,LastAlign);
+                  writer.MarkEmpty;
+                  //NewObject:=true;
+                end;
+              end;
+            ait_marker :
+              if tai_marker(hp).kind=mark_NoLineInfoStart then
+                inc(InlineLevel)
+              else if tai_marker(hp).kind=mark_NoLineInfoEnd then
+                dec(InlineLevel);
+            ait_stab,
+            ait_force_line,
+            ait_function_name : ;
+            else
+              if not WriteComments(hp) then
+                begin
+                  writer.AsmWrite(asminfo^.comment);
+                  writer.AsmWrite('WARNING: not yet implemented in assembler output: ');
+                  Str(hp.typ,s);
+                  writer.AsmWriteLn(s);
+                end;
+          end;
+          lasthp:=hp;
+          hp:=tai(hp.next);
+        end;
+    end;
+
+
+    procedure TSdccSdas6500Assembler.WriteAsmList;
+      var
+        hal: TAsmListType;
+      begin
+        WriteExternals;
+
+        for hal:=low(TasmlistType) to high(TasmlistType) do
+          begin
+            writer.AsmWriteLn(asminfo^.comment+'Begin asmlist '+AsmListTypeStr[hal]);
+            writetree(current_asmdata.asmlists[hal]);
+            writer.AsmWriteLn(asminfo^.comment+'End asmlist '+AsmListTypeStr[hal]);
+          end;
+      end;
+
+
+    function TSdccSdas6500Assembler.MakeCmdLine: TCmdStr;
+      begin
+        result := {'-mmcu='+lower(cputypestr[current_settings.cputype])+' '+}inherited MakeCmdLine;
+      end;
+
+
+    const
+       as_sdcc_sdas6500_asm_info : tasminfo =
+          (
+            id     : as_sdcc_sdas6500;
+
+            idtxt  : 'SDCC-SDAS6500';
+            asmbin : 'sdasz80';
+            asmcmd : '-g -o $EXTRAOPT $OBJ $ASM';
+            supported_targets : [system_Z80_embedded];
+            flags : [af_needar];
+            labelprefix : '.L';
+            labelmaxlen : 79;
+            comment : '; ';
+            dollarsign: '$';
+          );
+
+
+begin
+  RegisterAssembler(as_sdcc_sdas6500_asm_info,TSdccSdas6500Assembler);
+end.

compiler/mos6502/cputarg.pas

@@ -0,0 +1,75 @@
+{
+    Copyright (c) 2001-2008 by Peter Vreman
+
+    Includes the MOS Technology 6502 dependent target units
+
+    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 cputarg;
+
+{$i fpcdefs.inc}
+
+interface
+
+
+implementation
+
+    uses
+      systems { prevent a syntax error when nothing is included }
+
+{**************************************
+             Targets
+**************************************}
+
+    {$ifndef NOTARGETEMBEDDED}
+      ,t_embed
+    {$endif}
+    {$ifndef NOTARGETORIC}
+      //,t_oric
+    {$endif}
+
+{**************************************
+             Assemblers
+**************************************}
+
+    {$ifndef NOAGSDAS6500}
+      ,agsdas6500
+    {$endif}
+
+      ,ogrel
+
+{**************************************
+        Assembler Readers
+**************************************}
+
+//  {$ifndef NoRaZ80asm}
+//      ,raz80asm
+//  {$endif NoRaZ80asm}
+
+{**************************************
+             Debuginfo
+**************************************}
+
+  {$ifndef NoDbgStabs}
+      ,dbgstabs
+  {$endif NoDbgStabs}
+  {$ifndef NoDbgDwarf}
+      ,dbgdwarf
+  {$endif NoDbgDwarf}
+      ;
+
+end.

compiler/ogbase.pas

@@ -112,6 +112,10 @@ interface
          RELOC_ABSOLUTE_HI8,
          RELOC_ABSOLUTE_LO8,
 {$endif z80}
+{$ifdef mos6502}
+         RELOC_ABSOLUTE_HI8,
+         RELOC_ABSOLUTE_LO8,
+{$endif mos6502}
 {$ifdef WASM32}
          RELOC_FUNCTION_INDEX_LEB,
          RELOC_MEMORY_ADDR_LEB,

compiler/systems.inc

@@ -295,6 +295,7 @@
              ,as_clang_llvm_darwin
              ,as_m68k_elf32
              ,as_win64_gas
+             ,as_sdcc_sdas6500
        );
 
        tlink = (ld_none,