freepascal.compiler/compiler/systems/t_msdos.pas

{
    Copyright (c) 1998-2002 by Peter Vreman

    This unit implements support import,export,link routines
    for the (i386) Go32v2 target

    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 t_msdos;

{$i fpcdefs.inc}

interface


implementation

    uses
       SysUtils,
       cutils,cfileutl,cclasses,
       globtype,globals,systems,verbose,script,
       fmodule,i_msdos,
       link{,ogcoff},aasmbase;

    type
{      TInternalLinkerGo32v2=class(TInternallinker)
        constructor create;override;
        procedure DefaultLinkScript;override;
      end;}

      TExternalLinkerGo32v2=class(texternallinker)
      private
         Function  WriteResponseFile(isdll:boolean) : Boolean;
         Function  WriteScript(isdll:boolean) : Boolean;
      public
         constructor Create;override;
         procedure SetDefaultInfo;override;
         function  MakeExecutable:boolean;override;
      end;


{****************************************************************************
                                  TCoffLinker
****************************************************************************}

(*    constructor TInternalLinkerGo32v2.Create;
      begin
        inherited Create;
        CExeoutput:=TDJCoffexeoutput;
        CObjInput:=TDJCoffObjInput;
      end;


    procedure TInternalLinkerGo32v2.DefaultLinkScript;
      var
        s: TCmdStr;
        linklibc: Boolean;
        i: longint;

      procedure AddLib(const name: TCmdStr);
        var
          s2: TCmdStr;
        begin
          if FindLibraryFile(name,target_info.staticClibprefix,target_info.staticClibext,s2) then
            LinkScript.Concat('READSTATICLIBRARY '+MaybeQuoted(s2))
          else
            Comment(V_Error,'Import library not found for '+name);
        end;

      begin
        with LinkScript do
          begin
            Concat('READOBJECT '+GetShortName(FindObjectFile('prt0','',false)));
            while not ObjectFiles.Empty do
              begin
                s:=ObjectFiles.GetFirst;
                if s<>'' then
                  Concat('READOBJECT '+MaybeQuoted(s));
              end;
            while not StaticLibFiles.Empty do
              begin
                s:=StaticLibFiles.GetFirst;
                if s<>'' then
                  Concat('READSTATICLIBRARY '+MaybeQuoted(s));
              end;
            linklibc:=False;
            while not SharedLibFiles.Empty do
              begin
                S:=SharedLibFiles.GetFirst;
                if S<>'c' then
                  begin
                    i:=Pos(target_info.sharedlibext,S);
                    if i>0 then
                      Delete(S,i,255);
                    AddLib(s);
                  end
                else
                  linklibc:=true;
              end;
            { be sure that to add libc and libgcc at the end }
            if linklibc then
              begin
                AddLib('c');
                AddLib('gcc');
              end;

            Concat('ENTRYNAME start');
            Concat('HEADER');
            Concat('EXESECTION .text');
            Concat('  OBJSECTION  .text*');
            Concat('  SYMBOL etext');
            Concat('  PROVIDE _etext');
            Concat('ENDEXESECTION');
            Concat('EXESECTION .data');
            Concat('  SYMBOL djgpp_first_ctor');
            Concat('  OBJSECTION .ctors.*');
            Concat('  OBJSECTION .ctor');
            Concat('  OBJSECTION .ctors');
            Concat('  SYMBOL djgpp_last_ctor');
            Concat('  SYMBOL djgpp_first_dtor');
            Concat('  OBJSECTION .dtors.*');
            Concat('  OBJSECTION .dtor');
            Concat('  OBJSECTION .dtors');
            Concat('  SYMBOL djgpp_last_dtor');
            Concat('  SYMBOL __environ');
            Concat('  PROVIDE _environ');
            Concat('  LONG 0');
            Concat('  OBJSECTION .data*');
            Concat('  OBJSECTION .fpc*');
            Concat('  OBJSECTION .gcc_exc*');
            Concat('  SYMBOL ___EH_FRAME_BEGIN__');
            Concat('  OBJSECTION .eh_fram*');
            Concat('  SYMBOL ___EH_FRAME_END__');
            Concat('  LONG 0');
            Concat('  SYMBOL edata');
            Concat('  SYMBOL _edata');
            Concat('ENDEXESECTION');
            Concat('EXESECTION .bss');
            //ScriptRes.Add('      _object.2 = . ;');
            //ScriptRes.Add('      . += 32 ;');
            Concat('  OBJSECTION .bss*');
            Concat('  SYMBOL end');
            Concat('  SYMBOL _end');
            Concat('ENDEXESECTION');
            { Stabs debugging sections }
            Concat('EXESECTION .stab');
            Concat('  OBJSECTION .stab');
            Concat('ENDEXESECTION');
            Concat('EXESECTION .stabstr');
            Concat('  OBJSECTION .stabstr');
            Concat('ENDEXESECTION');
            { DWARF 2 }
            ScriptAddGenericSections('.debug_aranges,.debug_pubnames,.debug_info,.debug_abbrev,'+
              '.debug_line,.debug_frame,.debug_str,.debug_loc,.debug_macinfo');
            Concat('STABS');
            Concat('SYMBOLS');
          end;
      end;
*)

{****************************************************************************
                               TExternalLinkerGo32v2
****************************************************************************}

Constructor TExternalLinkerGo32v2.Create;
begin
  Inherited Create;
  { allow duplicated libs (PM) }
  SharedLibFiles.doubles:=true;
  StaticLibFiles.doubles:=true;
end;


procedure TExternalLinkerGo32v2.SetDefaultInfo;
begin
  with Info do
   begin
     ExeCmd[1]:='ld $RES';
   end;
end;


Function TExternalLinkerGo32v2.WriteResponseFile(isdll:boolean) : Boolean;
Var
  linkres  : TLinkRes;
  i        : longint;
  s        : string;
  linklibc : boolean;
begin
  WriteResponseFile:=False;

  { Open link.res file }
  LinkRes:=TLinkRes.Create(outputexedir+Info.ResName,true);

  { Add all options to link.res instead of passing them via command line:
    DOS command line is limited to 126 characters! }
  LinkRes.Add('--script='+maybequoted(outputexedir+Info.ScriptName));
  if (cs_link_map in current_settings.globalswitches) then
    LinkRes.Add('-Map '+maybequoted(ChangeFileExt(current_module.exefilename,'.map')));
  if create_smartlink_sections then
    LinkRes.Add('--gc-sections');
  if info.ExtraOptions<>'' then
    LinkRes.Add(Info.ExtraOptions);
(* Potential issues with older ld version??? *)
  if (cs_link_strip in current_settings.globalswitches) then
    LinkRes.Add('-s');
  LinkRes.Add('-o '+maybequoted(current_module.exefilename));

  { Write staticlibraries }
  if not StaticLibFiles.Empty then
   begin
     LinkRes.Add('-(');
     While not StaticLibFiles.Empty do
      begin
        S:=StaticLibFiles.GetFirst;
        LinkRes.AddFileName(GetShortName(s))
      end;
     LinkRes.Add('-)');
   end;

  { Write sharedlibraries like -l<lib>, also add the needed dynamic linker
    here to be sure that it gets linked this is needed for glibc2 systems (PFV) }
  linklibc:=false;
  While not SharedLibFiles.Empty do
   begin
     S:=SharedLibFiles.GetFirst;
     if s<>'c' then
      begin
        i:=Pos(target_info.sharedlibext,S);
        if i>0 then
         Delete(S,i,255);
        LinkRes.Add('-l'+s);
      end
     else
       linklibc:=true;
   end;
  { be sure that libc&libgcc is the last lib }
  if linklibc then
   begin
     LinkRes.Add('-lc');
     LinkRes.Add('-lgcc');
   end;

{ Write and Close response }
  linkres.writetodisk;
  LinkRes.Free;

  WriteResponseFile:=True;
end;


Function TExternalLinkerGo32v2.WriteScript(isdll:boolean) : Boolean;
Var
  scriptres  : TLinkRes;
  HPath    : TCmdStrListItem;
  s        : string;
begin
  WriteScript:=False;

  { Open link.res file }
  ScriptRes:=TLinkRes.Create(outputexedir+Info.ScriptName,true);
  ScriptRes.Add('OUTPUT_FORMAT("coff-go32-exe")');
  ScriptRes.Add('ENTRY(start)');

  ScriptRes.Add('SECTIONS');
  ScriptRes.Add('{');
  ScriptRes.Add('  .text  0x1000+SIZEOF_HEADERS : {');
  ScriptRes.Add('  . = ALIGN(16);');
  { add objectfiles, start with prt0 always }
  ScriptRes.Add('  '+GetShortName(FindObjectFile('prt0','',false))+'(.text)');
  while not ObjectFiles.Empty do
   begin
     s:=ObjectFiles.GetFirst;
     if s<>'' then
       begin
          ScriptRes.Add('  . = ALIGN(16);');
          ScriptRes.Add('  '+GetShortName(s)+'(.text)');
       end;
   end;
  ScriptRes.Add('    *(.text)');
  ScriptRes.Add('    *(.text.*)');
  ScriptRes.Add('    etext  =  . ;');
  ScriptRes.Add('    PROVIDE(_etext  =  .);');
  ScriptRes.Add('    . = ALIGN(0x200);');
  ScriptRes.Add('  }');
  ScriptRes.Add('    .data  ALIGN(0x200) : {');
  ScriptRes.Add('      djgpp_first_ctor = . ;');
  ScriptRes.Add('      *(SORT(.ctors.*))');
  ScriptRes.Add('      *(.ctor)');
  ScriptRes.Add('      *(.ctors)');
  ScriptRes.Add('      djgpp_last_ctor = . ;');
  ScriptRes.Add('      djgpp_first_dtor = . ;');
  ScriptRes.Add('      *(SORT(.dtors.*))');
  ScriptRes.Add('      *(.dtor)');
  ScriptRes.Add('      *(.dtors)');
  ScriptRes.Add('      djgpp_last_dtor = . ;');
  ScriptRes.Add('      __environ = . ;');
  ScriptRes.Add('      PROVIDE(_environ = .);');
  ScriptRes.Add('      LONG(0)');
  ScriptRes.Add('      *(.data)');
  ScriptRes.Add('      *(.data.*)');
  ScriptRes.Add('      *(.fpc*)');
  ScriptRes.Add('      *(.gcc_exc)');
  ScriptRes.Add('      ___EH_FRAME_BEGIN__ = . ;');
  ScriptRes.Add('      *(.eh_fram*)');
  ScriptRes.Add('      ___EH_FRAME_END__ = . ;');
  ScriptRes.Add('      LONG(0)');
  ScriptRes.Add('       edata  =  . ; _edata = .;');
  ScriptRes.Add('       . = ALIGN(0x200);');
  ScriptRes.Add('    }');
  ScriptRes.Add('    .bss  SIZEOF(.data) + ADDR(.data) :');
  ScriptRes.Add('    {');
  ScriptRes.Add('      _object.2 = . ;');
  ScriptRes.Add('      . += 32 ;');
  ScriptRes.Add('      *(.bss)');
  ScriptRes.Add('      *(.bss.*)');
  ScriptRes.Add('      *(COMMON)');
  ScriptRes.Add('       end = . ; _end = .;');
  ScriptRes.Add('       . = ALIGN(0x200);');
  ScriptRes.Add('    }');
  ScriptRes.Add('    /* Stabs debugging sections.  */');
  ScriptRes.Add('    .stab 0 : { *(.stab) }');
  ScriptRes.Add('    .stabstr 0 : { *(.stabstr) }');
  ScriptRes.Add('    /* DWARF 2 */');
  ScriptRes.Add('    .debug_aranges  0 : { *(.debug_aranges) }');
  ScriptRes.Add('    .debug_pubnames 0 : { *(.debug_pubnames) }');
  ScriptRes.Add('    .debug_info     0 : { *(.debug_info) *(.gnu.linkonce.wi.*) }');
  ScriptRes.Add('    .debug_abbrev   0 : { *(.debug_abbrev) }');
  ScriptRes.Add('    .debug_line     0 : { *(.debug_line) }');
  ScriptRes.Add('    .debug_frame    0 : { *(.debug_frame) }');
  ScriptRes.Add('    .debug_str      0 : { *(.debug_str) }');
  ScriptRes.Add('    .debug_loc      0 : { *(.debug_loc) }');
  ScriptRes.Add('    .debug_macinfo  0 : { *(.debug_macinfo) }');
  ScriptRes.Add('  }');

  { Write path to search libraries }
  HPath:=TCmdStrListItem(current_module.locallibrarysearchpath.First);
  while assigned(HPath) do
   begin
     ScriptRes.Add('SEARCH_DIR("'+GetShortName(HPath.Str)+'")');
     HPath:=TCmdStrListItem(HPath.Next);
   end;
  HPath:=TCmdStrListItem(LibrarySearchPath.First);
  while assigned(HPath) do
   begin
     ScriptRes.Add('SEARCH_DIR("'+GetShortName(HPath.Str)+'")');
     HPath:=TCmdStrListItem(HPath.Next);
   end;

{ Write and Close response }
  ScriptRes.WriteToDisk;
  ScriptRes.Free;

  WriteScript:=True;
end;



function TExternalLinkerGo32v2.MakeExecutable:boolean;
var
  binstr,
  cmdstr  : TCmdStr;
  success : boolean;
begin
  if not(cs_link_nolink in current_settings.globalswitches) then
   Message1(exec_i_linking,current_module.exefilename);

  { Write used files and libraries and our own ld script }
  WriteScript(false);
  WriteResponsefile(false);

{ Call linker }
  SplitBinCmd(Info.ExeCmd[1],binstr,cmdstr);
  Replace(cmdstr,'$RES','@'+maybequoted(outputexedir+Info.ResName));
  success:=DoExec(FindUtil(utilsprefix+BinStr),cmdstr,true,false);

{ Remove ReponseFile }
  if (success) and not(cs_link_nolink in current_settings.globalswitches) then
   begin
     DeleteFile(outputexedir+Info.ResName);
     DeleteFile(outputexedir+Info.ScriptName);
   end;

  MakeExecutable:=success;   { otherwise a recursive call to link method }
end;


{$ifdef notnecessary}
procedure TExternalLinkerGo32v2.postprocessexecutable(const n : string);
type
  tcoffheader=packed record
    mach   : word;
    nsects : word;
    time   : longint;
    sympos : longint;
    syms   : longint;
    opthdr : word;
    flag   : word;
  end;
  tcoffsechdr=packed record
    name     : array[0..7] of char;
    vsize    : longint;
    rvaofs   : longint;
    datalen  : longint;
    datapos  : longint;
    relocpos : longint;
    lineno1  : longint;
    nrelocs  : word;
    lineno2  : word;
    flags    : longint;
  end;
  psecfill=^TSecfill;
  TSecfill=record
    fillpos,
    fillsize : longint;
    next : psecfill;
  end;
var
  f : file;
  coffheader : tcoffheader;
  firstsecpos,
  maxfillsize,
  l : longint;
  coffsec : tcoffsechdr;
  secroot,hsecroot : psecfill;
  zerobuf : pointer;
begin
  { when -s is used quit, because there is no .exe }
  if cs_link_nolink in current_settings.globalswitches then
   exit;
  { open file }
  assign(f,n);
  {$push}{$I-}
   reset(f,1);
  if ioresult<>0 then
    Message1(execinfo_f_cant_open_executable,n);
  { read headers }
  seek(f,2048);
  blockread(f,coffheader,sizeof(tcoffheader));
  { read section info }
  maxfillsize:=0;
  firstsecpos:=0;
  secroot:=nil;
  for l:=1to coffheader.nSects do
   begin
     blockread(f,coffsec,sizeof(tcoffsechdr));
     if coffsec.datapos>0 then
      begin
        if secroot=nil then
         firstsecpos:=coffsec.datapos;
        new(hsecroot);
        hsecroot^.fillpos:=coffsec.datapos+coffsec.vsize;
        hsecroot^.fillsize:=coffsec.datalen-coffsec.vsize;
        hsecroot^.next:=secroot;
        secroot:=hsecroot;
        if secroot^.fillsize>maxfillsize then
         maxfillsize:=secroot^.fillsize;
      end;
   end;
  if firstsecpos>0 then
   begin
     l:=firstsecpos-filepos(f);
     if l>maxfillsize then
      maxfillsize:=l;
   end
  else
   l:=0;
  { get zero buffer }
  getmem(zerobuf,maxfillsize);
  fillchar(zerobuf^,maxfillsize,0);
  { zero from sectioninfo until first section }
  blockwrite(f,zerobuf^,l);
  { zero section alignments }
  while assigned(secroot) do
   begin
     seek(f,secroot^.fillpos);
     blockwrite(f,zerobuf^,secroot^.fillsize);
     hsecroot:=secroot;
     secroot:=secroot^.next;
     dispose(hsecroot);
   end;
  freemem(zerobuf,maxfillsize);
  close(f);
  {$pop}
  i:=ioresult;
  postprocessexecutable:=true;
end;
{$endif}


{*****************************************************************************
                                     Initialize
*****************************************************************************}

initialization
  RegisterExternalLinker(system_i8086_msdos_info,TExternalLinkerGo32v2);
  RegisterTarget(system_i8086_msdos_info);
end.