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https://gitlab.com/freepascal.org/fpc/source.git
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13f39b9e21
* dwarf debug sections must be placed at address 0 * added names of sections that are commonly found in gcc-compiled libraries (fixes linking to certain libraries) git-svn-id: trunk@11168 -
404 lines
11 KiB
ObjectPascal
404 lines
11 KiB
ObjectPascal
{
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Copyright (c) 1998-2002 by Peter Vreman
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This unit implements support import,export,link routines
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for the (i386) Go32v2 target
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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****************************************************************************
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}
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unit t_go32v2;
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{$i fpcdefs.inc}
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interface
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implementation
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uses
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SysUtils,
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cutils,cfileutl,cclasses,
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globtype,globals,systems,verbose,script,
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fmodule,i_go32v2,
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link,ogcoff;
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type
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TInternalLinkerGo32v2=class(TInternallinker)
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constructor create;override;
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procedure DefaultLinkScript;override;
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end;
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TExternalLinkerGo32v2=class(texternallinker)
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private
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Function WriteResponseFile(isdll:boolean) : Boolean;
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Function WriteScript(isdll:boolean) : Boolean;
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public
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constructor Create;override;
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procedure SetDefaultInfo;override;
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function MakeExecutable:boolean;override;
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end;
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{****************************************************************************
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TCoffLinker
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****************************************************************************}
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constructor TInternalLinkerGo32v2.Create;
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begin
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inherited Create;
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CExeoutput:=TDJCoffexeoutput;
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CObjInput:=TDJCoffObjInput;
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end;
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procedure TInternalLinkerGo32v2.DefaultLinkScript;
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begin
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end;
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{****************************************************************************
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TExternalLinkerGo32v2
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****************************************************************************}
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Constructor TExternalLinkerGo32v2.Create;
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begin
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Inherited Create;
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{ allow duplicated libs (PM) }
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SharedLibFiles.doubles:=true;
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StaticLibFiles.doubles:=true;
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end;
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procedure TExternalLinkerGo32v2.SetDefaultInfo;
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begin
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with Info do
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begin
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ExeCmd[1]:='ld $RES';
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end;
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end;
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Function TExternalLinkerGo32v2.WriteResponseFile(isdll:boolean) : Boolean;
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Var
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linkres : TLinkRes;
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i : longint;
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s : string;
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linklibc : boolean;
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begin
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WriteResponseFile:=False;
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{ Open link.res file }
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LinkRes:=TLinkRes.Create(outputexedir+Info.ResName);
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{ Add all options to link.res instead of passing them via command line:
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DOS command line is limited to 126 characters! }
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LinkRes.Add('--script='+maybequoted(outputexedir+Info.ScriptName));
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if info.ExtraOptions<>'' then
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LinkRes.Add(Info.ExtraOptions);
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(* Potential issues with older ld version??? *)
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if (cs_link_strip in current_settings.globalswitches) then
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LinkRes.Add('-s');
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LinkRes.Add('-o '+maybequoted(current_module.exefilename^));
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{ Write staticlibraries }
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if not StaticLibFiles.Empty then
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begin
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LinkRes.Add('-(');
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While not StaticLibFiles.Empty do
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begin
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S:=StaticLibFiles.GetFirst;
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LinkRes.AddFileName(GetShortName(s))
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end;
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LinkRes.Add('-)');
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end;
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{ Write sharedlibraries like -l<lib>, also add the needed dynamic linker
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here to be sure that it gets linked this is needed for glibc2 systems (PFV) }
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linklibc:=false;
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While not SharedLibFiles.Empty do
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begin
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S:=SharedLibFiles.GetFirst;
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if s<>'c' then
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begin
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i:=Pos(target_info.sharedlibext,S);
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if i>0 then
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Delete(S,i,255);
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LinkRes.Add('-l'+s);
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end
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else
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begin
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LinkRes.Add('-l'+s);
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linklibc:=true;
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end;
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end;
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{ be sure that libc&libgcc is the last lib }
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if linklibc then
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begin
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LinkRes.Add('-lc');
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LinkRes.Add('-lgcc');
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end;
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{ Write and Close response }
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linkres.writetodisk;
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LinkRes.Free;
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WriteResponseFile:=True;
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end;
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Function TExternalLinkerGo32v2.WriteScript(isdll:boolean) : Boolean;
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Var
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scriptres : TLinkRes;
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HPath : TCmdStrListItem;
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s : string;
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begin
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WriteScript:=False;
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{ Open link.res file }
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ScriptRes:=TLinkRes.Create(outputexedir+Info.ScriptName);
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ScriptRes.Add('OUTPUT_FORMAT("coff-go32-exe")');
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ScriptRes.Add('ENTRY(start)');
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ScriptRes.Add('SECTIONS');
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ScriptRes.Add('{');
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ScriptRes.Add(' .text 0x1000+SIZEOF_HEADERS : {');
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ScriptRes.Add(' . = ALIGN(16);');
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{ add objectfiles, start with prt0 always }
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ScriptRes.Add(' '+GetShortName(FindObjectFile('prt0','',false))+'(.text)');
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while not ObjectFiles.Empty do
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begin
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s:=ObjectFiles.GetFirst;
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if s<>'' then
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begin
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ScriptRes.Add(' . = ALIGN(16);');
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ScriptRes.Add(' '+GetShortName(s)+'(.text)');
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end;
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end;
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ScriptRes.Add(' *(.text)');
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ScriptRes.Add(' etext = . ; _etext = .;');
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ScriptRes.Add(' . = ALIGN(0x200);');
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ScriptRes.Add(' }');
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ScriptRes.Add(' .data ALIGN(0x200) : {');
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ScriptRes.Add(' djgpp_first_ctor = . ;');
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ScriptRes.Add(' *(SORT(.ctors.*))');
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ScriptRes.Add(' *(.ctor)');
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ScriptRes.Add(' *(.ctors)');
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ScriptRes.Add(' djgpp_last_ctor = . ;');
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ScriptRes.Add(' djgpp_first_dtor = . ;');
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ScriptRes.Add(' *(SORT(.dtors.*))');
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ScriptRes.Add(' *(.dtor)');
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ScriptRes.Add(' *(.dtors)');
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ScriptRes.Add(' djgpp_last_dtor = . ;');
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ScriptRes.Add(' *(.data)');
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ScriptRes.Add(' *(.fpc*)');
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ScriptRes.Add(' *(.gcc_exc)');
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ScriptRes.Add(' ___EH_FRAME_BEGIN__ = . ;');
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ScriptRes.Add(' *(.eh_fram*)');
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ScriptRes.Add(' ___EH_FRAME_END__ = . ;');
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ScriptRes.Add(' LONG(0)');
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ScriptRes.Add(' edata = . ; _edata = .;');
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ScriptRes.Add(' . = ALIGN(0x200);');
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ScriptRes.Add(' }');
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ScriptRes.Add(' .bss SIZEOF(.data) + ADDR(.data) :');
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ScriptRes.Add(' {');
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ScriptRes.Add(' _object.2 = . ;');
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ScriptRes.Add(' . += 24 ;');
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ScriptRes.Add(' *(.bss)');
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ScriptRes.Add(' *(COMMON)');
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ScriptRes.Add(' end = . ; _end = .;');
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ScriptRes.Add(' . = ALIGN(0x200);');
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ScriptRes.Add(' }');
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ScriptRes.Add(' /* Stabs debugging sections. */');
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ScriptRes.Add(' .stab 0 : { *(.stab) }');
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ScriptRes.Add(' .stabstr 0 : { *(.stabstr) }');
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ScriptRes.Add(' /* DWARF 2 */');
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ScriptRes.Add(' .debug_aranges 0 : { *(.debug_aranges) }');
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ScriptRes.Add(' .debug_pubnames 0 : { *(.debug_pubnames) }');
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ScriptRes.Add(' .debug_info 0 : { *(.debug_info) *(.gnu.linkonce.wi.*) }');
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ScriptRes.Add(' .debug_abbrev 0 : { *(.debug_abbrev) }');
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ScriptRes.Add(' .debug_line 0 : { *(.debug_line) }');
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ScriptRes.Add(' .debug_frame 0 : { *(.debug_frame) }');
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ScriptRes.Add(' .debug_str 0 : { *(.debug_str) }');
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ScriptRes.Add(' .debug_loc 0 : { *(.debug_loc) }');
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ScriptRes.Add(' .debug_macinfo 0 : { *(.debug_macinfo) }');
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ScriptRes.Add(' }');
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{ Write path to search libraries }
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HPath:=TCmdStrListItem(current_module.locallibrarysearchpath.First);
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while assigned(HPath) do
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begin
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ScriptRes.Add('SEARCH_DIR("'+GetShortName(HPath.Str)+'")');
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HPath:=TCmdStrListItem(HPath.Next);
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end;
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HPath:=TCmdStrListItem(LibrarySearchPath.First);
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while assigned(HPath) do
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begin
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ScriptRes.Add('SEARCH_DIR("'+GetShortName(HPath.Str)+'")');
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HPath:=TCmdStrListItem(HPath.Next);
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end;
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{ Write and Close response }
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ScriptRes.WriteToDisk;
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ScriptRes.Free;
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WriteScript:=True;
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end;
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function TExternalLinkerGo32v2.MakeExecutable:boolean;
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var
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binstr,
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cmdstr : TCmdStr;
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success : boolean;
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begin
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if not(cs_link_nolink in current_settings.globalswitches) then
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Message1(exec_i_linking,current_module.exefilename^);
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{ Write used files and libraries and our own ld script }
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WriteScript(false);
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WriteResponsefile(false);
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{ Call linker }
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SplitBinCmd(Info.ExeCmd[1],binstr,cmdstr);
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Replace(cmdstr,'$RES','@'+maybequoted(outputexedir+Info.ResName));
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success:=DoExec(FindUtil(utilsprefix+BinStr),cmdstr,true,false);
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{ Remove ReponseFile }
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if (success) and not(cs_link_nolink in current_settings.globalswitches) then
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begin
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DeleteFile(outputexedir+Info.ResName);
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DeleteFile(outputexedir+Info.ScriptName);
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end;
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MakeExecutable:=success; { otherwise a recursive call to link method }
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end;
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{$ifdef notnecessary}
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procedure TExternalLinkerGo32v2.postprocessexecutable(const n : string);
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type
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tcoffheader=packed record
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mach : word;
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nsects : word;
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time : longint;
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sympos : longint;
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syms : longint;
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opthdr : word;
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flag : word;
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end;
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tcoffsechdr=packed record
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name : array[0..7] of char;
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vsize : longint;
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rvaofs : longint;
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datalen : longint;
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datapos : longint;
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relocpos : longint;
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lineno1 : longint;
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nrelocs : word;
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lineno2 : word;
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flags : longint;
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end;
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psecfill=^TSecfill;
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TSecfill=record
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fillpos,
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fillsize : longint;
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next : psecfill;
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end;
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var
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f : file;
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coffheader : tcoffheader;
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firstsecpos,
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maxfillsize,
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l : longint;
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coffsec : tcoffsechdr;
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secroot,hsecroot : psecfill;
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zerobuf : pointer;
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begin
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{ when -s is used quit, because there is no .exe }
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if cs_link_nolink in current_settings.globalswitches then
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exit;
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{ open file }
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assign(f,n);
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{$I-}
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reset(f,1);
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if ioresult<>0 then
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Message1(execinfo_f_cant_open_executable,n);
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{ read headers }
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seek(f,2048);
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blockread(f,coffheader,sizeof(tcoffheader));
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{ read section info }
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maxfillsize:=0;
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firstsecpos:=0;
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secroot:=nil;
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for l:=1to coffheader.nSects do
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begin
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blockread(f,coffsec,sizeof(tcoffsechdr));
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if coffsec.datapos>0 then
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begin
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if secroot=nil then
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firstsecpos:=coffsec.datapos;
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new(hsecroot);
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hsecroot^.fillpos:=coffsec.datapos+coffsec.vsize;
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hsecroot^.fillsize:=coffsec.datalen-coffsec.vsize;
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hsecroot^.next:=secroot;
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secroot:=hsecroot;
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if secroot^.fillsize>maxfillsize then
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maxfillsize:=secroot^.fillsize;
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end;
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end;
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if firstsecpos>0 then
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begin
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l:=firstsecpos-filepos(f);
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if l>maxfillsize then
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maxfillsize:=l;
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end
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else
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l:=0;
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{ get zero buffer }
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getmem(zerobuf,maxfillsize);
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fillchar(zerobuf^,maxfillsize,0);
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{ zero from sectioninfo until first section }
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blockwrite(f,zerobuf^,l);
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{ zero section alignments }
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while assigned(secroot) do
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begin
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seek(f,secroot^.fillpos);
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blockwrite(f,zerobuf^,secroot^.fillsize);
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hsecroot:=secroot;
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secroot:=secroot^.next;
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dispose(hsecroot);
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end;
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freemem(zerobuf,maxfillsize);
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close(f);
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{$I+}
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i:=ioresult;
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postprocessexecutable:=true;
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end;
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{$endif}
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{*****************************************************************************
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Initialize
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*****************************************************************************}
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initialization
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RegisterExternalLinker(system_i386_go32v2_info,TExternalLinkerGo32v2);
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// RegisterInternalLinker(system_i386_go32v2_info,TInternalLinkerGo32v2);
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RegisterTarget(system_i386_go32v2_info);
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end.
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