freepascal.compiler/compiler/systems/t_embed.pas

{
    This unit implements support import,export,link routines
    for the (arm) GameBoy Advance target

    Copyright (c) 2001-2002 by Peter Vreman

    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_embed;

{$i fpcdefs.inc}

interface


implementation

    uses
       SysUtils,
       cutils,cfileutl,cclasses,
       globtype,globals,systems,verbose,comphook,script,fmodule,i_embed,link,
       cpuinfo;

    type
       TlinkerEmbedded=class(texternallinker)
       private
          Function  WriteResponseFile: Boolean;
       public
          constructor Create; override;
          procedure SetDefaultInfo; override;
          function  MakeExecutable:boolean; override;
          function postprocessexecutable(const fn : string;isdll:boolean):boolean;
       end;



{*****************************************************************************
                                  TlinkerEmbedded
*****************************************************************************}

Constructor TlinkerEmbedded.Create;
begin
  Inherited Create;
  SharedLibFiles.doubles:=true;
  StaticLibFiles.doubles:=true;
end;


procedure TlinkerEmbedded.SetDefaultInfo;
begin
  with Info do
   begin
     ExeCmd[1]:='ld -g $OPT $DYNLINK $STATIC $GCSECTIONS $STRIP -L. -o $EXE -T $RES';
   end;
end;


Function TlinkerEmbedded.WriteResponseFile: Boolean;
Var
  linkres  : TLinkRes;
  i        : longint;
  HPath    : TCmdStrListItem;
  s,s1,s2  : TCmdStr;
  prtobj,
  cprtobj  : string[80];
  linklibc : boolean;
  found1,
  found2   : boolean;
{$ifdef ARM}
  LinkStr  : string;
{$endif}
begin
  WriteResponseFile:=False;
  linklibc:=(SharedLibFiles.Find('c')<>nil);
{$if defined(ARM) or defined(i386) or defined(AVR)}
  prtobj:='';
{$else}
  prtobj:='prt0';
{$endif}
  cprtobj:='cprt0';
  if linklibc then
    prtobj:=cprtobj;

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

  { Write path to search libraries }
  HPath:=TCmdStrListItem(current_module.locallibrarysearchpath.First);
  while assigned(HPath) do
   begin
    s:=HPath.Str;
    if (cs_link_on_target in current_settings.globalswitches) then
     s:=ScriptFixFileName(s);
    LinkRes.Add('-L'+s);
    HPath:=TCmdStrListItem(HPath.Next);
   end;
  HPath:=TCmdStrListItem(LibrarySearchPath.First);
  while assigned(HPath) do
   begin
    s:=HPath.Str;
    if s<>'' then
     LinkRes.Add('SEARCH_DIR("'+s+'")');
    HPath:=TCmdStrListItem(HPath.Next);
   end;

  LinkRes.Add('INPUT (');
  { add objectfiles, start with prt0 always }
  //s:=FindObjectFile('prt0','',false);
  if prtobj<>'' then
    begin
      s:=FindObjectFile(prtobj,'',false);
      LinkRes.AddFileName(s);
    end;
  { try to add crti and crtbegin if linking to C }
  if linklibc then
   begin
     if librarysearchpath.FindFile('crtbegin.o',false,s) then
      LinkRes.AddFileName(s);
     if librarysearchpath.FindFile('crti.o',false,s) then
      LinkRes.AddFileName(s);
   end;

  while not ObjectFiles.Empty do
   begin
    s:=ObjectFiles.GetFirst;
    if s<>'' then
     begin
      { vlink doesn't use SEARCH_DIR for object files }
      if not(cs_link_on_target in current_settings.globalswitches) then
       s:=FindObjectFile(s,'',false);
      LinkRes.AddFileName((maybequoted(s)));
     end;
   end;

  { Write staticlibraries }
  if not StaticLibFiles.Empty then
   begin
    { vlink doesn't need, and doesn't support GROUP }
    if (cs_link_on_target in current_settings.globalswitches) then
     begin
      LinkRes.Add(')');
      LinkRes.Add('GROUP(');
     end;
    while not StaticLibFiles.Empty do
     begin
      S:=StaticLibFiles.GetFirst;
      LinkRes.AddFileName((maybequoted(s)));
     end;
   end;

  if (cs_link_on_target in current_settings.globalswitches) then
   begin
    LinkRes.Add(')');

    { 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
       begin
        LinkRes.Add('-l'+s);
        linklibc:=true;
       end;
     end;
    { be sure that libc&libgcc is the last lib }
    if linklibc then
     begin
      LinkRes.Add('-lc');
      LinkRes.Add('-lgcc');
     end;
   end
  else
   begin
    while not SharedLibFiles.Empty do
     begin
      S:=SharedLibFiles.GetFirst;
      LinkRes.Add('lib'+s+target_info.staticlibext);
     end;
    LinkRes.Add(')');
   end;

  { objects which must be at the end }
  if linklibc then
   begin
     found1:=librarysearchpath.FindFile('crtend.o',false,s1);
     found2:=librarysearchpath.FindFile('crtn.o',false,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;

{$ifdef ARM}
  case current_settings.controllertype of
      ct_none:
           begin
           end;
      ct_lpc1343,
      ct_lpc2114,
      ct_lpc2124,
      ct_lpc2194,
      ct_lpc1768,
      ct_at91sam7s256,
      ct_at91sam7se256,
      ct_at91sam7x256,
      ct_at91sam7xc256,

      ct_stm32f100x4,
      ct_stm32f100x6,
      ct_stm32f100x8,
      ct_stm32f100xB,
      ct_stm32f100xC,
      ct_stm32f100xD,
      ct_stm32f100xE,
      ct_stm32f101x4,
      ct_stm32f101x6,
      ct_stm32f101x8,
      ct_stm32f101xB,
      ct_stm32f101xC,
      ct_stm32f101xD,
      ct_stm32f101xE,
      ct_stm32f101xF,
      ct_stm32f101xG,
      ct_stm32f102x4,
      ct_stm32f102x6,
      ct_stm32f102x8,
      ct_stm32f102xB,
      ct_stm32f103x4,
      ct_stm32f103x6,
      ct_stm32f103x8,
      ct_stm32f103xB,
      ct_stm32f103xC,
      ct_stm32f103xD,
      ct_stm32f103xE,
      ct_stm32f103xF,
      ct_stm32f103xG,
      ct_stm32f107x8,
      ct_stm32f107xB,
      ct_stm32f107xC,

      { TI - 64 K Flash, 16 K SRAM Devices }
      ct_lm3s1110,
      ct_lm3s1133,
      ct_lm3s1138,
      ct_lm3s1150,
      ct_lm3s1162,
      ct_lm3s1165,
      ct_lm3s1166,
      ct_lm3s2110,
      ct_lm3s2139,
      ct_lm3s6100,
      ct_lm3s6110,

      { TI 128 K Flash, 32 K SRAM devices - Fury Class }
      ct_lm3s1601,
      ct_lm3s1608,
      ct_lm3s1620,
      ct_lm3s1635,
      ct_lm3s1636,
      ct_lm3s1637,
      ct_lm3s1651,
      ct_lm3s2601,
      ct_lm3s2608,
      ct_lm3s2620,
      ct_lm3s2637,
      ct_lm3s2651,
      ct_lm3s6610,
      ct_lm3s6611,
      ct_lm3s6618,
      ct_lm3s6633,
      ct_lm3s6637,
      ct_lm3s8630,

      { TI 256 K Flase, 32 K SRAM devices - Fury Class }
      ct_lm3s1911,
      ct_lm3s1918,
      ct_lm3s1937,
      ct_lm3s1958,
      ct_lm3s1960,
      ct_lm3s1968,
      ct_lm3s1969,
      ct_lm3s2911,
      ct_lm3s2918,
      ct_lm3s2919,
      ct_lm3s2939,
      ct_lm3s2948,
      ct_lm3s2950,
      ct_lm3s2965,
      ct_lm3s6911,
      ct_lm3s6918,
      ct_lm3s6938,
      ct_lm3s6950,
      ct_lm3s6952,
      ct_lm3s6965,
      ct_lm3s8930,
      ct_lm3s8933,
      ct_lm3s8938,
      ct_lm3s8962,
      ct_lm3s8970,
      ct_lm3s8971,

      { TI - Tempest Tempest - 256 K Flash, 64 K SRAM }
      ct_lm3s5951,
      ct_lm3s5956,
      ct_lm3s1b21,
      ct_lm3s2b93,
      ct_lm3s5b91,
      ct_lm3s9b81,
      ct_lm3s9b90,
      ct_lm3s9b92,
      ct_lm3s9b95,
      ct_lm3s9b96,
      ct_sc32442b,
      ct_thumb2bare:
        begin
         with embedded_controllers[current_settings.controllertype] do
          with linkres do
            begin
              Add('ENTRY(_START)');
              Add('MEMORY');
              Add('{');
              if flashsize<>0 then
                begin
                  LinkStr := '    flash : ORIGIN = 0x' + IntToHex(flashbase,8)
                    + ', LENGTH = 0x' + IntToHex(flashsize,8);
                  Add(LinkStr);
                end;

              LinkStr := '    ram : ORIGIN = 0x' + IntToHex(srambase,8)
              	+ ', LENGTH = 0x' + IntToHex(sramsize,8);
              Add(LinkStr);

              Add('}');
              Add('_stack_top = 0x' + IntToHex(sramsize+srambase,8) + ';');
            end;
        end
    else
      if not (cs_link_nolink in current_settings.globalswitches) then
      	 internalerror(200902011);
  end;

  with linkres do
    begin
      Add('SECTIONS');
      Add('{');
      Add('     .text :');
      Add('    {');
      Add('    KEEP(*(.init, .init.*))');
      Add('    *(.text, .text.*)');
      Add('    *(.strings)');
      Add('    *(.rodata, .rodata.*)');
      Add('    *(.comment)');
      Add('    _etext = .;');
      if embedded_controllers[current_settings.controllertype].flashsize<>0 then
        begin
          Add('    } >flash');
        end
      else
        begin
          Add('    } >ram');
        end;
      Add('    .note.gnu.build-id : { *(.note.gnu.build-id) }');

      Add('    .data :');
      Add('    {');
      Add('    _data = .;');
      Add('    *(.data, .data.*)');
      Add('    KEEP (*(.fpc .fpc.n_version .fpc.n_links))');
      Add('    _edata = .;');
      if embedded_controllers[current_settings.controllertype].flashsize<>0 then
        begin
          Add('    } >ram AT >flash');
        end
      else
        begin
          Add('    } >ram');
        end;
      Add('    .bss :');
      Add('    {');
      Add('    _bss_start = .;');
      Add('    *(.bss, .bss.*)');
      Add('    *(COMMON)');
      Add('    } >ram');
      Add('. = ALIGN(4);');
      Add('_bss_end = . ;');
      Add('}');
      Add('_end = .;');
    end;
{$endif ARM}

{$ifdef i386}
  with linkres do
    begin
      Add('ENTRY(_START)');
      Add('SECTIONS');
      Add('{');
      Add('     . = 0x100000;');
      Add('     .text ALIGN (0x1000) :');
      Add('    {');
      Add('    KEEP(*(.init, .init.*))');
      Add('    *(.text, .text.*)');
      Add('    *(.strings)');
      Add('    *(.rodata, .rodata.*)');
      Add('    *(.comment)');
      Add('    _etext = .;');
      Add('    }');
      Add('    .data ALIGN (0x1000) :');
      Add('    {');
      Add('    _data = .;');
      Add('    *(.data, .data.*)');
      Add('    KEEP (*(.fpc .fpc.n_version .fpc.n_links))');
      Add('    _edata = .;');
      Add('    }');
      Add('    . = ALIGN(4);');
      Add('    .bss :');
      Add('    {');
      Add('    _bss_start = .;');
      Add('    *(.bss, .bss.*)');
      Add('    *(COMMON)');
      Add('    }');
      Add('_bss_end = . ;');
      Add('}');
      Add('_end = .;');
    end;
{$endif i386}

{$ifdef AVR}
  with linkres do
    begin
      { linker script from ld 2.19 }
      Add('ENTRY(_START)');
      Add('OUTPUT_FORMAT("elf32-avr","elf32-avr","elf32-avr")');
      Add('OUTPUT_ARCH(avr:2)');
      Add('MEMORY');
      Add('{');
      Add('  text      (rx)   : ORIGIN = 0, LENGTH = 8K');
      Add('  data      (rw!x) : ORIGIN = 0x800060, LENGTH = 0xffa0');
      Add('  eeprom    (rw!x) : ORIGIN = 0x810000, LENGTH = 64K');
      Add('  fuse      (rw!x) : ORIGIN = 0x820000, LENGTH = 1K');
      Add('  lock      (rw!x) : ORIGIN = 0x830000, LENGTH = 1K');
      Add('  signature (rw!x) : ORIGIN = 0x840000, LENGTH = 1K');
      Add('}');
      Add('SECTIONS');
      Add('{');
      Add('  /* Read-only sections, merged into text segment: */');
      Add('  .hash          : { *(.hash)		}');
      Add('  .dynsym        : { *(.dynsym)		}');
      Add('  .dynstr        : { *(.dynstr)		}');
      Add('  .gnu.version   : { *(.gnu.version)	}');
      Add('  .gnu.version_d   : { *(.gnu.version_d)	}');
      Add('  .gnu.version_r   : { *(.gnu.version_r)	}');
      Add('  .rel.init      : { *(.rel.init)		}');
      Add('  .rela.init     : { *(.rela.init)	}');
      Add('  .rel.text      :');
      Add('    {');
      Add('      *(.rel.text)');
      Add('      *(.rel.text.*)');
      Add('      *(.rel.gnu.linkonce.t*)');
      Add('    }');
      Add('  .rela.text     :');
      Add('    {');
      Add('      *(.rela.text)');
      Add('      *(.rela.text.*)');
      Add('      *(.rela.gnu.linkonce.t*)');
      Add('    }');
      Add('  .rel.fini      : { *(.rel.fini)		}');
      Add('  .rela.fini     : { *(.rela.fini)	}');
      Add('  .rel.rodata    :');
      Add('    {');
      Add('      *(.rel.rodata)');
      Add('      *(.rel.rodata.*)');
      Add('      *(.rel.gnu.linkonce.r*)');
      Add('    }');
      Add('  .rela.rodata   :');
      Add('    {');
      Add('      *(.rela.rodata)');
      Add('      *(.rela.rodata.*)');
      Add('      *(.rela.gnu.linkonce.r*)');
      Add('    }');
      Add('  .rel.data      :');
      Add('    {');
      Add('      *(.rel.data)');
      Add('      *(.rel.data.*)');
      Add('      *(.rel.gnu.linkonce.d*)');
      Add('    }');
      Add('  .rela.data     :');
      Add('    {');
      Add('      *(.rela.data)');
      Add('      *(.rela.data.*)');
      Add('      *(.rela.gnu.linkonce.d*)');
      Add('    }');
      Add('  .rel.ctors     : { *(.rel.ctors)	}');
      Add('  .rela.ctors    : { *(.rela.ctors)	}');
      Add('  .rel.dtors     : { *(.rel.dtors)	}');
      Add('  .rela.dtors    : { *(.rela.dtors)	}');
      Add('  .rel.got       : { *(.rel.got)		}');
      Add('  .rela.got      : { *(.rela.got)		}');
      Add('  .rel.bss       : { *(.rel.bss)		}');
      Add('  .rela.bss      : { *(.rela.bss)		}');
      Add('  .rel.plt       : { *(.rel.plt)		}');
      Add('  .rela.plt      : { *(.rela.plt)		}');
      Add('  /* Internal text space or external memory.  */');
      Add('  .text   :');
      Add('  {');
      Add('    *(.vectors)');
      Add('    KEEP(*(.vectors))');
      Add('    /* For data that needs to reside in the lower 64k of progmem.  */');
      Add('    *(.progmem.gcc*)');
      Add('    *(.progmem*)');
      Add('    . = ALIGN(2);');
      Add('     __trampolines_start = . ;');
      Add('    /* The jump trampolines for the 16-bit limited relocs will reside here.  */');
      Add('    *(.trampolines)');
      Add('    *(.trampolines*)');
      Add('     __trampolines_end = . ;');
      Add('    /* For future tablejump instruction arrays for 3 byte pc devices.');
      Add('       We don''t relax jump/call instructions within these sections.  */');
      Add('    *(.jumptables)');
      Add('    *(.jumptables*)');
      Add('    /* For code that needs to reside in the lower 128k progmem.  */');
      Add('    *(.lowtext)');
      Add('    *(.lowtext*)');
      Add('     __ctors_start = . ;');
      Add('     *(.ctors)');
      Add('     __ctors_end = . ;');
      Add('     __dtors_start = . ;');
      Add('     *(.dtors)');
      Add('     __dtors_end = . ;');
      Add('    KEEP(SORT(*)(.ctors))');
      Add('    KEEP(SORT(*)(.dtors))');
      Add('    /* From this point on, we don''t bother about wether the insns are');
      Add('       below or above the 16 bits boundary.  */');
      Add('    *(.init0)  /* Start here after reset.  */');
      Add('    KEEP (*(.init0))');
      Add('    *(.init1)');
      Add('    KEEP (*(.init1))');
      Add('    *(.init2)  /* Clear __zero_reg__, set up stack pointer.  */');
      Add('    KEEP (*(.init2))');
      Add('    *(.init3)');
      Add('    KEEP (*(.init3))');
      Add('    *(.init4)  /* Initialize data and BSS.  */');
      Add('    KEEP (*(.init4))');
      Add('    *(.init5)');
      Add('    KEEP (*(.init5))');
      Add('    *(.init6)  /* C++ constructors.  */');
      Add('    KEEP (*(.init6))');
      Add('    *(.init7)');
      Add('    KEEP (*(.init7))');
      Add('    *(.init8)');
      Add('    KEEP (*(.init8))');
      Add('    *(.init9)  /* Call main().  */');
      Add('    KEEP (*(.init9))');
      Add('    *(.text)');
      Add('    . = ALIGN(2);');
      Add('    *(.text.*)');
      Add('    . = ALIGN(2);');
      Add('    *(.fini9)  /* _exit() starts here.  */');
      Add('    KEEP (*(.fini9))');
      Add('    *(.fini8)');
      Add('    KEEP (*(.fini8))');
      Add('    *(.fini7)');
      Add('    KEEP (*(.fini7))');
      Add('    *(.fini6)  /* C++ destructors.  */');
      Add('    KEEP (*(.fini6))');
      Add('    *(.fini5)');
      Add('    KEEP (*(.fini5))');
      Add('    *(.fini4)');
      Add('    KEEP (*(.fini4))');
      Add('    *(.fini3)');
      Add('    KEEP (*(.fini3))');
      Add('    *(.fini2)');
      Add('    KEEP (*(.fini2))');
      Add('    *(.fini1)');
      Add('    KEEP (*(.fini1))');
      Add('    *(.fini0)  /* Infinite loop after program termination.  */');
      Add('    KEEP (*(.fini0))');
      Add('     _etext = . ;');
      Add('  }  > text');
      Add('  .data	  : AT (ADDR (.text) + SIZEOF (.text))');
      Add('  {');
      Add('     PROVIDE (__data_start = .) ;');
      Add('    *(.data)');
      Add('    *(.data*)');
      Add('    *(.rodata)  /* We need to include .rodata here if gcc is used */');
      Add('    *(.rodata*) /* with -fdata-sections.  */');
      Add('    *(.gnu.linkonce.d*)');
      Add('    . = ALIGN(2);');
      Add('     _edata = . ;');
      Add('     PROVIDE (__data_end = .) ;');
      Add('  }  > data');
      Add('  .bss   : AT (ADDR (.bss))');
      Add('  {');
      Add('     PROVIDE (__bss_start = .) ;');
      Add('    *(.bss)');
      Add('    *(.bss*)');
      Add('    *(COMMON)');
      Add('     PROVIDE (__bss_end = .) ;');
      Add('  }  > data');
      Add('   __data_load_start = LOADADDR(.data);');
      Add('   __data_load_end = __data_load_start + SIZEOF(.data);');
      Add('  /* Global data not cleared after reset.  */');
      Add('  .noinit  :');
      Add('  {');
      Add('     PROVIDE (__noinit_start = .) ;');
      Add('    *(.noinit*)');
      Add('     PROVIDE (__noinit_end = .) ;');
      Add('     _end = . ;');
      Add('     PROVIDE (__heap_start = .) ;');
      Add('  }  > data');
      Add('  .eeprom  :');
      Add('  {');
      Add('    *(.eeprom*)');
      Add('     __eeprom_end = . ;');
      Add('  }  > eeprom');
      Add('  .fuse  :');
      Add('  {');
      Add('    KEEP(*(.fuse))');
      Add('    KEEP(*(.lfuse))');
      Add('    KEEP(*(.hfuse))');
      Add('    KEEP(*(.efuse))');
      Add('  }  > fuse');
      Add('  .lock  :');
      Add('  {');
      Add('    KEEP(*(.lock*))');
      Add('  }  > lock');
      Add('  .signature  :');
      Add('  {');
      Add('    KEEP(*(.signature*))');
      Add('  }  > signature');
      Add('  /* Stabs debugging sections.  */');
      Add('  .stab 0 : { *(.stab) }');
      Add('  .stabstr 0 : { *(.stabstr) }');
      Add('  .stab.excl 0 : { *(.stab.excl) }');
      Add('  .stab.exclstr 0 : { *(.stab.exclstr) }');
      Add('  .stab.index 0 : { *(.stab.index) }');
      Add('  .stab.indexstr 0 : { *(.stab.indexstr) }');
      Add('  .comment 0 : { *(.comment) }');
      Add('  /* DWARF debug sections.');
      Add('     Symbols in the DWARF debugging sections are relative to the beginning');
      Add('     of the section so we begin them at 0.  */');
      Add('  /* DWARF 1 */');
      Add('  .debug          0 : { *(.debug) }');
      Add('  .line           0 : { *(.line) }');
      Add('  /* GNU DWARF 1 extensions */');
      Add('  .debug_srcinfo  0 : { *(.debug_srcinfo) }');
      Add('  .debug_sfnames  0 : { *(.debug_sfnames) }');
      Add('  /* DWARF 1.1 and DWARF 2 */');
      Add('  .debug_aranges  0 : { *(.debug_aranges) }');
      Add('  .debug_pubnames 0 : { *(.debug_pubnames) }');
      Add('  /* DWARF 2 */');
      Add('  .debug_info     0 : { *(.debug_info) *(.gnu.linkonce.wi.*) }');
      Add('  .debug_abbrev   0 : { *(.debug_abbrev) }');
      Add('  .debug_line     0 : { *(.debug_line) }');
      Add('  .debug_frame    0 : { *(.debug_frame) }');
      Add('  .debug_str      0 : { *(.debug_str) }');
      Add('  .debug_loc      0 : { *(.debug_loc) }');
      Add('  .debug_macinfo  0 : { *(.debug_macinfo) }');
      Add('}');
      { last address of ram on an atmega128 }
      Add('_stack_top = 0x0fff;');
    end;
{$endif AVR}

  { Write and Close response }
  linkres.writetodisk;
  linkres.free;

  WriteResponseFile:=True;

end;


function TlinkerEmbedded.MakeExecutable:boolean;
var
  binstr,
  cmdstr  : TCmdStr;
  success : boolean;
  StaticStr,
  GCSectionsStr,
  DynLinkStr,
  StripStr: string;
begin
  { for future use }
  StaticStr:='';
  StripStr:='';
  DynLinkStr:='';

  GCSectionsStr:='--gc-sections';
  //if not(cs_link_extern in current_settings.globalswitches) then
  if not(cs_link_nolink in current_settings.globalswitches) then
   Message1(exec_i_linking,current_module.exefilename);

{ Write used files and libraries }
  WriteResponseFile();

{ Call linker }
  SplitBinCmd(Info.ExeCmd[1],binstr,cmdstr);
  Replace(cmdstr,'$OPT',Info.ExtraOptions);
  if not(cs_link_on_target in current_settings.globalswitches) then
   begin
    Replace(cmdstr,'$EXE',(maybequoted(ScriptFixFileName(ChangeFileExt(current_module.exefilename,'.elf')))));
    Replace(cmdstr,'$RES',(maybequoted(ScriptFixFileName(outputexedir+Info.ResName))));
    Replace(cmdstr,'$STATIC',StaticStr);
    Replace(cmdstr,'$STRIP',StripStr);
    Replace(cmdstr,'$GCSECTIONS',GCSectionsStr);
    Replace(cmdstr,'$DYNLINK',DynLinkStr);
   end
  else
   begin
    Replace(cmdstr,'$EXE',maybequoted(ScriptFixFileName(ChangeFileExt(current_module.exefilename,'.elf'))));
    Replace(cmdstr,'$RES',maybequoted(ScriptFixFileName(outputexedir+Info.ResName)));
    Replace(cmdstr,'$STATIC',StaticStr);
    Replace(cmdstr,'$STRIP',StripStr);
    Replace(cmdstr,'$GCSECTIONS',GCSectionsStr);
    Replace(cmdstr,'$DYNLINK',DynLinkStr);
   end;
  success:=DoExec(FindUtil(utilsprefix+BinStr),cmdstr,true,false);

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

{ Post process }
  if success then
    success:=PostProcessExecutable(current_module.exefilename+'.elf',false);

  if success and (target_info.system in [system_arm_embedded,system_avr_embedded]) then
    begin
      success:=DoExec(FindUtil(utilsprefix+'objcopy'),'-O ihex '+
        ChangeFileExt(current_module.exefilename,'.elf')+' '+
        ChangeFileExt(current_module.exefilename,'.hex'),true,false);
    end;

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


function TLinkerEmbedded.postprocessexecutable(const fn : string;isdll:boolean):boolean;
  type
    TElf32header=packed record
      magic0123         : longint;
      file_class        : byte;
      data_encoding     : byte;
      file_version      : byte;
      padding           : array[$07..$0f] of byte;

      e_type            : word;
      e_machine         : word;
      e_version         : longint;
      e_entry           : longint;          { entrypoint }
      e_phoff           : longint;          { program header offset }

      e_shoff           : longint;          { sections header offset }
      e_flags           : longint;
      e_ehsize          : word;             { elf header size in bytes }
      e_phentsize       : word;             { size of an entry in the program header array }
      e_phnum           : word;             { 0..e_phnum-1 of entrys }
      e_shentsize       : word;             { size of an entry in sections header array }
      e_shnum           : word;             { 0..e_shnum-1 of entrys }
      e_shstrndx        : word;             { index of string section header }
    end;
    TElf32sechdr=packed record
      sh_name           : longint;
      sh_type           : longint;
      sh_flags          : longint;
      sh_addr           : longint;

      sh_offset         : longint;
      sh_size           : longint;
      sh_link           : longint;
      sh_info           : longint;

      sh_addralign      : longint;
      sh_entsize        : longint;
    end;

  function MayBeSwapHeader(h : telf32header) : telf32header;
    begin
      result:=h;
      if source_info.endian<>target_info.endian then
        with h do
          begin
            result.e_type:=swapendian(e_type);
            result.e_machine:=swapendian(e_machine);
            result.e_version:=swapendian(e_version);
            result.e_entry:=swapendian(e_entry);
            result.e_phoff:=swapendian(e_phoff);
            result.e_shoff:=swapendian(e_shoff);
            result.e_flags:=swapendian(e_flags);
            result.e_ehsize:=swapendian(e_ehsize);
            result.e_phentsize:=swapendian(e_phentsize);
            result.e_phnum:=swapendian(e_phnum);
            result.e_shentsize:=swapendian(e_shentsize);
            result.e_shnum:=swapendian(e_shnum);
            result.e_shstrndx:=swapendian(e_shstrndx);
          end;
    end;

  function MaybeSwapSecHeader(h : telf32sechdr) : telf32sechdr;
    begin
      result:=h;
      if source_info.endian<>target_info.endian then
        with h do
          begin
            result.sh_name:=swapendian(sh_name);
            result.sh_type:=swapendian(sh_type);
            result.sh_flags:=swapendian(sh_flags);
            result.sh_addr:=swapendian(sh_addr);
            result.sh_offset:=swapendian(sh_offset);
            result.sh_size:=swapendian(sh_size);
            result.sh_link:=swapendian(sh_link);
            result.sh_info:=swapendian(sh_info);
            result.sh_addralign:=swapendian(sh_addralign);
            result.sh_entsize:=swapendian(sh_entsize);
          end;
    end;

  var
    f : file;

  function ReadSectionName(pos : longint) : String;
    var
      oldpos : longint;
      c : char;
    begin
      oldpos:=filepos(f);
      seek(f,pos);
      Result:='';
      while true do
        begin
          blockread(f,c,1);
          if c=#0 then
            break;
          Result:=Result+c;
        end;
      seek(f,oldpos);
    end;

  var
    elfheader : TElf32header;
    secheader : TElf32sechdr;
    i : longint;
    stringoffset : longint;
    secname : string;
  begin
    postprocessexecutable:=false;
    { open file }
    assign(f,fn);
    {$push}{$I-}
    reset(f,1);
    if ioresult<>0 then
      Message1(execinfo_f_cant_open_executable,fn);
    { read header }
    blockread(f,elfheader,sizeof(tElf32header));
    elfheader:=MayBeSwapHeader(elfheader);
    seek(f,elfheader.e_shoff);
    { read string section header }
    seek(f,elfheader.e_shoff+sizeof(TElf32sechdr)*elfheader.e_shstrndx);
    blockread(f,secheader,sizeof(secheader));
    secheader:=MaybeSwapSecHeader(secheader);
    stringoffset:=secheader.sh_offset;

    seek(f,elfheader.e_shoff);
    status.datasize:=0;
    for i:=0 to elfheader.e_shnum-1 do
      begin
        blockread(f,secheader,sizeof(secheader));
        secheader:=MaybeSwapSecHeader(secheader);
        secname:=ReadSectionName(stringoffset+secheader.sh_name);
        if secname='.text' then
          begin
            Message1(execinfo_x_codesize,tostr(secheader.sh_size));
            status.codesize:=secheader.sh_size;
          end
        else if secname='.data' then
          begin
            Message1(execinfo_x_initdatasize,tostr(secheader.sh_size));
            inc(status.datasize,secheader.sh_size);
          end
        else if secname='.bss' then
          begin
            Message1(execinfo_x_uninitdatasize,tostr(secheader.sh_size));
            inc(status.datasize,secheader.sh_size);
          end;

      end;
    close(f);
    {$pop}
    if ioresult<>0 then
      ;
    postprocessexecutable:=true;
  end;


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

initialization
{$ifdef arm}
  RegisterExternalLinker(system_arm_embedded_info,TlinkerEmbedded);
  RegisterTarget(system_arm_embedded_info);
{$endif arm}

{$ifdef avr}
  RegisterExternalLinker(system_avr_embedded_info,TlinkerEmbedded);
  RegisterTarget(system_avr_embedded_info);
{$endif avr}

{$ifdef i386}
  RegisterExternalLinker(system_i386_embedded_info,TlinkerEmbedded);
  RegisterTarget(system_i386_embedded_info);
{$endif i386}
end.