{
    $Id$
    Copyright (c) 1998-2002 by Peter Vreman

    This unit implements support import,export,link routines
    for the (i386) Linux 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_linux;

{$i fpcdefs.inc}

interface

  uses
    symsym,symdef,
    import,export,link;

  type
    timportliblinux=class(timportlib)
      procedure preparelib(const s:string);override;
      procedure importprocedure(aprocdef:tprocdef;const module:string;index:longint;const name:string);override;
      procedure importvariable(vs:tglobalvarsym;const name,module:string);override;
      procedure generatelib;override;
    end;

    texportliblinux=class(texportlib)
      procedure preparelib(const s : string);override;
      procedure exportprocedure(hp : texported_item);override;
      procedure exportvar(hp : texported_item);override;
      procedure generatelib;override;
    end;

    tlinkerlinux=class(texternallinker)
    private
      libctype:(libc5,glibc2,glibc21,uclibc);
      Function  WriteResponseFile(isdll:boolean) : Boolean;
    public
      constructor Create;override;
      procedure SetDefaultInfo;override;
      function  MakeExecutable:boolean;override;
      function  MakeSharedLibrary:boolean;override;
    end;


implementation

  uses
    cutils,cclasses,
    verbose,systems,globtype,globals,
    symconst,script,
    fmodule,dos
    ,aasmbase,aasmtai,aasmcpu,cpubase,cgobj
    ,i_linux
    ;

{*****************************************************************************
                               TIMPORTLIBLINUX
*****************************************************************************}

procedure timportliblinux.preparelib(const s : string);
begin
end;


procedure timportliblinux.importprocedure(aprocdef:tprocdef;const module:string;index:longint;const name:string);
begin
  { insert sharedlibrary }
  current_module.linkothersharedlibs.add(SplitName(module),link_allways);
end;


procedure timportliblinux.importvariable(vs:tglobalvarsym;const name,module:string);
begin
  { insert sharedlibrary }
  current_module.linkothersharedlibs.add(SplitName(module),link_allways);
  { reset the mangledname and turn off the dll_var option }
  vs.set_mangledname(name);
  exclude(vs.varoptions,vo_is_dll_var);
end;


procedure timportliblinux.generatelib;
begin
end;


{*****************************************************************************
                               TEXPORTLIBLINUX
*****************************************************************************}

procedure texportliblinux.preparelib(const s:string);
begin
end;


procedure texportliblinux.exportprocedure(hp : texported_item);
var
  hp2 : texported_item;
begin
  { first test the index value }
  if (hp.options and eo_index)<>0 then
   begin
     Message1(parser_e_no_export_with_index_for_target,'linux');
     exit;
   end;
  { now place in correct order }
  hp2:=texported_item(current_module._exports.first);
  while assigned(hp2) and
     (hp.name^>hp2.name^) do
    hp2:=texported_item(hp2.next);
  { insert hp there !! }
  if assigned(hp2) and (hp2.name^=hp.name^) then
    begin
      { this is not allowed !! }
      Message1(parser_e_export_name_double,hp.name^);
      exit;
    end;
  if hp2=texported_item(current_module._exports.first) then
    current_module._exports.concat(hp)
  else if assigned(hp2) then
    begin
       hp.next:=hp2;
       hp.previous:=hp2.previous;
       if assigned(hp2.previous) then
         hp2.previous.next:=hp;
       hp2.previous:=hp;
    end
  else
    current_module._exports.concat(hp);
end;


procedure texportliblinux.exportvar(hp : texported_item);
begin
  hp.is_var:=true;
  exportprocedure(hp);
end;


procedure texportliblinux.generatelib;
var
  hp2 : texported_item;
begin
  new_section(codesegment,sec_code,'',0);
  hp2:=texported_item(current_module._exports.first);
  while assigned(hp2) do
   begin
     if (not hp2.is_var) and
        (hp2.sym.typ=procsym) then
      begin
        { the manglednames can already be the same when the procedure
          is declared with cdecl }
        if tprocsym(hp2.sym).first_procdef.mangledname<>hp2.name^ then
         begin
           { place jump in codesegment }
           codesegment.concat(tai_align.create(target_info.alignment.procalign));
           codeSegment.concat(Tai_symbol.Createname_global(hp2.name^,AT_FUNCTION,0));
           cg.a_jmp_name(codesegment,tprocsym(hp2.sym).first_procdef.mangledname);
           codeSegment.concat(Tai_symbol_end.Createname(hp2.name^));
         end;
      end
     else
      Message1(parser_e_no_export_of_variables_for_target,'linux');
     hp2:=texported_item(hp2.next);
   end;
end;


{*****************************************************************************
                                  TLINKERLINUX
*****************************************************************************}

Constructor TLinkerLinux.Create;
begin
  Inherited Create;
  if not Dontlinkstdlibpath Then
   LibrarySearchPath.AddPath('/lib;/usr/lib;/usr/X11R6/lib',true);
end;


procedure TLinkerLinux.SetDefaultInfo;
{
  This will also detect which libc version will be used
}
{$ifdef m68k}
var
  St : SearchRec;
{$endif m68k}
begin
  with Info do
   begin
     ExeCmd[1]:='ld $OPT $DYNLINK $STATIC $GCSECTIONS $STRIP -L. -o $EXE $RES';
     DllCmd[1]:='ld $OPT $INIT $FINI $SONAME -shared -L. -o $EXE $RES';
     DllCmd[2]:='strip --strip-unneeded $EXE';
{$ifdef m68k}
     libctype:=glibc2;
     FindFirst('/lib/ld*',AnyFile,st);
     while DosError=0 do
      begin
        if copy(st.name,1,5)='ld-2.' then
         begin
           DynamicLinker:='/lib/'+St.name;
           if st.name[6]<>'0' then
             libctype:=glibc21;
           break;
         end;
         FindNext(St);
      end;
     FindClose(St);
{$endif m68k}

{$ifdef i386}
     { first try glibc2 }
     DynamicLinker:='/lib/ld-linux.so.2';
     if FileExists(DynamicLinker) then
       { Check for 2.0 files, else use the glibc 2.1 stub }
       if FileExists('/lib/ld-2.0.*') then
         libctype:=glibc2
       else
         libctype:=glibc21
     else
       if fileexists('/lib/ld-uClibc.so.0') then
         begin
           libctype:=uclibc;
           dynamiclinker:='/lib/ld-uClibc.so.0';
         end
       else
         DynamicLinker:='/lib/ld-linux.so.1';
{$endif i386}

{$ifdef x86_64}
     DynamicLinker:='/lib64/ld-linux-x86-64.so.2';
     libctype:=glibc2;
{$endif x86_64}

{$ifdef sparc}
     DynamicLinker:='/lib/ld-linux.so.2';
     libctype:=glibc2;
{$endif sparc}

{$ifdef powerpc}
     DynamicLinker:='/lib/ld.so.1';
     libctype:=glibc2;
{$endif powerpc}

{$ifdef arm}
     DynamicLinker:='/lib/ld-linux.so.2';
     libctype:=glibc2;
{$endif arm}
   end;
end;


Function TLinkerLinux.WriteResponseFile(isdll:boolean) : Boolean;
Var
  linkres      : TLinkRes;
  i            : longint;
  cprtobj,
  gprtobj,
  prtobj       : string[80];
  HPath        : TStringListItem;
  s,s1,s2      : string;
  found1,
  found2,
  linklibc     : boolean;
begin
  WriteResponseFile:=False;
{ set special options for some targets }
  linklibc:=(SharedLibFiles.Find('c')<>nil);
  if isdll then
   begin
     prtobj:='dllprt0';
     cprtobj:='dllprt0';
     gprtobj:='dllprt0';
   end
  else
   begin
     prtobj:='prt0';
     case libctype of
       glibc21:
         begin
           cprtobj:='cprt21';
           gprtobj:='gprt21';
         end;
       uclibc:
         begin
           cprtobj:='ucprt0';
           gprtobj:='ugprt0';
         end
       else
         cprtobj:='cprt0';
         gprtobj:='gprt0';
     end;
   end;
  if cs_profile in aktmoduleswitches then
   begin
     prtobj:=gprtobj;
     if not(libctype in [glibc2,glibc21]) then
       AddSharedLibrary('gmon');
     AddSharedLibrary('c');
     linklibc:=true;
   end
  else
   begin
     if linklibc then
      prtobj:=cprtobj;
   end;

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

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

  LinkRes.Add('INPUT(');
  { add objectfiles, start with prt0 always }
  if prtobj<>'' then
   LinkRes.AddFileName(maybequoted(FindObjectFile(prtobj,'',false)));
  { try to add crti and crtbegin if linking to C }
  if linklibc then
   begin
     if librarysearchpath.FindFile('crtbegin.o',s) then
      LinkRes.AddFileName(s);
     if librarysearchpath.FindFile('crti.o',s) then
      LinkRes.AddFileName(s);
   end;
  { main objectfiles }
  while not ObjectFiles.Empty do
   begin
     s:=ObjectFiles.GetFirst;
     if s<>'' then
      LinkRes.AddFileName(maybequoted(s));
   end;
  LinkRes.Add(')');

  { Write staticlibraries }
  if not StaticLibFiles.Empty then
   begin
     LinkRes.Add('GROUP(');
     While not StaticLibFiles.Empty do
      begin
        S:=StaticLibFiles.GetFirst;
        LinkRes.AddFileName(maybequoted(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) }
  if not SharedLibFiles.Empty then
   begin
     LinkRes.Add('INPUT(');
     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
         begin
           linklibc:=true;
         end;
      end;
     { be sure that libc is the last lib }
     if linklibc then
      LinkRes.Add('-lc');
     { when we have -static for the linker the we also need libgcc }
     if (cs_link_staticflag in aktglobalswitches) then
      LinkRes.Add('-lgcc');
     LinkRes.Add(')');
   end;

  { objects which must be at the end }
  if linklibc and (libctype<>uclibc) then
   begin
     found1:=librarysearchpath.FindFile('crtend.o',s1);
     found2:=librarysearchpath.FindFile('crtn.o',s2);
     if found1 or found2 then
      begin
        LinkRes.Add('INPUT(');
        if found1 then
         LinkRes.AddFileName(s1);
        if found2 then
         LinkRes.AddFileName(s2);
        LinkRes.Add(')');
      end;
   end;
{ Write and Close response }
  linkres.writetodisk;
  linkres.Free;

  WriteResponseFile:=True;
end;


function TLinkerLinux.MakeExecutable:boolean;
var
  binstr : String;
  cmdstr  : TCmdStr;
  success : boolean;
  DynLinkStr : string[60];
  GCSectionsStr,
  StaticStr,
  StripStr   : string[40];
begin
  if not(cs_link_extern in aktglobalswitches) then
   Message1(exec_i_linking,current_module.exefilename^);

{ Create some replacements }
  StaticStr:='';
  StripStr:='';
  GCSectionsStr:='';
  DynLinkStr:='';
  if (cs_link_staticflag in aktglobalswitches) then
   StaticStr:='-static';
  if (cs_link_strip in aktglobalswitches) then
   StripStr:='-s';
  if (cs_link_smart in aktglobalswitches) and
     (tf_smartlink_sections in target_info.flags) then
   GCSectionsStr:='--gc-sections';
  If (cs_profile in aktmoduleswitches) or
     ((Info.DynamicLinker<>'') and (not SharedLibFiles.Empty)) then
   begin
     DynLinkStr:='-dynamic-linker='+Info.DynamicLinker;
     if cshared Then
       DynLinkStr:='--shared ' + DynLinkStr;
     if rlinkpath<>'' Then
       DynLinkStr:='--rpath-link '+rlinkpath + ' '+ DynLinkStr;
   End;

{ Write used files and libraries }
  WriteResponseFile(false);

{ Call linker }
  SplitBinCmd(Info.ExeCmd[1],binstr,cmdstr);
  Replace(cmdstr,'$EXE',maybequoted(current_module.exefilename^));
  Replace(cmdstr,'$OPT',Info.ExtraOptions);
  Replace(cmdstr,'$RES',maybequoted(outputexedir+Info.ResName));
  Replace(cmdstr,'$STATIC',StaticStr);
  Replace(cmdstr,'$STRIP',StripStr);
  Replace(cmdstr,'$GCSECTIONS',GCSectionsStr);
  Replace(cmdstr,'$DYNLINK',DynLinkStr);
  success:=DoExec(FindUtil(utilsprefix+BinStr),CmdStr,true,false);

{ Remove ReponseFile }
  if (success) and not(cs_link_extern in aktglobalswitches) then
   RemoveFile(outputexedir+Info.ResName);

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


Function TLinkerLinux.MakeSharedLibrary:boolean;
var
  InitStr,
  FiniStr,
  SoNameStr : string[80];
  binstr : String;
  cmdstr  : TCmdStr;
  success : boolean;
begin
  MakeSharedLibrary:=false;
  if not(cs_link_extern in aktglobalswitches) then
   Message1(exec_i_linking,current_module.sharedlibfilename^);

{ Write used files and libraries }
  WriteResponseFile(true);

 { Create some replacements }
  InitStr:='-init FPC_LIB_START';
  FiniStr:='-fini FPC_LIB_EXIT';
  SoNameStr:='-soname '+SplitFileName(current_module.sharedlibfilename^);

{ Call linker }
  SplitBinCmd(Info.DllCmd[1],binstr,cmdstr);
  Replace(cmdstr,'$EXE',maybequoted(current_module.sharedlibfilename^));
  Replace(cmdstr,'$OPT',Info.ExtraOptions);
  Replace(cmdstr,'$RES',maybequoted(outputexedir+Info.ResName));
  Replace(cmdstr,'$INIT',InitStr);
  Replace(cmdstr,'$FINI',FiniStr);
  Replace(cmdstr,'$SONAME',SoNameStr);
  success:=DoExec(FindUtil(utilsprefix+binstr),cmdstr,true,false);

{ Strip the library ? }
  if success and (cs_link_strip in aktglobalswitches) then
   begin
     SplitBinCmd(Info.DllCmd[2],binstr,cmdstr);
     Replace(cmdstr,'$EXE',maybequoted(current_module.sharedlibfilename^));
     success:=DoExec(FindUtil(utilsprefix+binstr),cmdstr,true,false);
   end;

{ Remove ReponseFile }
  if (success) and not(cs_link_extern in aktglobalswitches) then
   RemoveFile(outputexedir+Info.ResName);

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


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

initialization
{$ifdef i386}
  RegisterExternalLinker(system_i386_linux_info,TLinkerLinux);
  RegisterImport(system_i386_linux,timportliblinux);
  RegisterExport(system_i386_linux,texportliblinux);
  RegisterTarget(system_i386_linux_info);
{$endif i386}
{$ifdef m68k}
  RegisterExternalLinker(system_m68k_linux_info,TLinkerLinux);
  RegisterImport(system_m68k_linux,timportliblinux);
  RegisterExport(system_m68k_linux,texportliblinux);
  RegisterTarget(system_m68k_linux_info);
{$endif m68k}
{$ifdef powerpc}
  RegisterExternalLinker(system_powerpc_linux_info,TLinkerLinux);
  RegisterImport(system_powerpc_linux,timportliblinux);
  RegisterExport(system_powerpc_linux,texportliblinux);
  RegisterTarget(system_powerpc_linux_info);
{$endif powerpc}
{$ifdef alpha}
  RegisterExternalLinker(system_alpha_linux_info,TLinkerLinux);
  RegisterImport(system_alpha_linux,timportliblinux);
  RegisterExport(system_alpha_linux,texportliblinux);
  RegisterTarget(system_alpha_linux_info);
{$endif alpha}
{$ifdef x86_64}
  RegisterExternalLinker(system_x86_64_linux_info,TLinkerLinux);
  RegisterImport(system_x86_64_linux,timportliblinux);
  RegisterExport(system_x86_64_linux,texportliblinux);
  RegisterTarget(system_x86_64_linux_info);
{$endif x86_64}
{$ifdef SPARC}
  RegisterExternalLinker(system_sparc_linux_info,TLinkerLinux);
  RegisterImport(system_SPARC_linux,timportliblinux);
  RegisterExport(system_SPARC_linux,texportliblinux);
  RegisterTarget(system_SPARC_linux_info);
{$endif SPARC}
{$ifdef ARM}
  RegisterExternalLinker(system_arm_linux_info,TLinkerLinux);
  RegisterImport(system_arm_linux,timportliblinux);
  RegisterExport(system_arm_linux,texportliblinux);
  RegisterTarget(system_arm_linux_info);
{$endif ARM}
end.

{
  $Log$
  Revision 1.33  2005-01-10 15:56:13  peter
    * generate export jmps in .text section

  Revision 1.32  2004/12/22 16:32:46  peter
    * maybequoted() added

  Revision 1.31  2004/12/19 14:03:16  florian
    * dyn. linker path fixed for x86_64

  Revision 1.30  2004/11/17 22:22:12  peter
  mangledname setting moved to place after the complete proc declaration is read
  import generation moved to place where body is also parsed (still gives problems with win32)

  Revision 1.29  2004/11/08 22:09:59  peter
    * tvarsym splitted

  Revision 1.28  2004/11/05 12:27:27  florian
    * fixed dyn. linker handling

  Revision 1.27  2004/11/05 11:04:23  florian
    * path of dyn. linker on arm for linux fixed

  Revision 1.26  2004/10/24 13:36:26  peter
    * gc-sections added when section smartlinking is used

  Revision 1.25  2004/10/14 18:16:17  mazen
  * USE_SYSUTILS merged successfully : cycles with and without defines
  * Need to be optimized in performance

  Revision 1.24  2004/09/25 18:44:12  florian
    * fixed dyn. linker name for sparc

  Revision 1.23  2004/09/22 15:25:14  mazen
  * Fix error committing : previous version must be in branch USE_SYSUTILS

  Revision 1.21  2004/09/21 17:25:13  peter
    * paraloc branch merged

  Revision 1.20.4.1  2004/09/20 15:24:42  peter
    * remove gc-sections option until it really works

  Revision 1.20  2004/07/08 14:42:54  daniel
    * Uclibc detection

  Revision 1.19  2004/06/20 08:55:32  florian
    * logs truncated

  Revision 1.18  2004/06/16 20:07:11  florian
    * dwarf branch merged

  Revision 1.17.2.3  2004/05/10 21:28:35  peter
    * section_smartlink enabled for gas under linux

  Revision 1.17.2.2  2004/05/03 20:18:52  peter
    * fixes for tprintf

  Revision 1.17.2.1  2004/04/08 18:33:22  peter
    * rewrite of TAsmSection

  Revision 1.17  2004/03/06 20:35:20  florian
    * fixed arm compilation
    * cleaned up code generation for exported linux procedures

}