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eea81b4ef4
fpc/compiler/systems/t_linux.pas
tom_at_work 9ce34c63c9 Fix shared library loading and unloading for Linux platforms. Shared library initialization and finalization are now called correctly at program startup for compile-time linked dynamic libraries on powerpc-/powerpc64-/arm-/i386- and x86_64-linux. 
Every startup code must now provide an additional entry point called "_dynamic_start" that is set as new the entry point if the program links to a Pascal shared library. Its purpose is to set up an exit hook usually passed via a register, which should be called during program finalization if non-nil.

We use this additional entry point because this register only has meaningful content when there are any compile-time linked shared libraries, otherwise it often contains random garbage. The difference between the _dynamic_start and the original code is minimal; actually in all implementations the _dynamic_start code passes on control to the old startup code, so we use an additional entry point instead of an additional startup file.

Detailed changes and fixes list:
compiler:
  always link to the dynamic loader (ld.so) when compiling shared libraries. Fixes crashes in the loader during shared library finalization on some Linuxes
  remove additional ENTRY() section in arm linker script
  select either _dynamic_start or _start as entry point depending on whether this is a static or dynamic executable
powerpc*:
  do not set System.isLibrary in startup code, it will be set during library initialization anyway
  trap in case of reaching code locations that should not be reached instead of looping (possibly endlessly)
powerpc:
  register atexit() function pointer if supplied to the executable and call it during shutdown
  correctly set argc/argv/envp in shared library code and return correctly to the caller after initialization
  pass on exitcode in shared library haltproc
  use the more recent exit_group system call if available for shutdown
powerpc64
  fix .ptrgl stub, do not set the environment register to the value of the GOT entry in the function descriptor
arm
  do not set System.isLibrary in startup code, it will be set during library initialization anyway
  reload exitcode to pass to shutdown
mips,mipsel,sparc
  added stubs to allow correct linking

git-svn-id: trunk@19036 -
2011-09-08 21:17:35 +00:00

1189 lines
44 KiB
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{
Copyright (c) 1998-2008 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
aasmdata,
symsym,symdef,ppu,
import,export,expunix,link;
type
timportliblinux=class(timportlib)
procedure generatelib;override;
end;
texportliblinux=class(texportlibunix)
procedure setfininame(list: TAsmList; const s: string); override;
end;
tlinkerlinux=class(texternallinker)
private
libctype:(libc5,glibc2,glibc21,uclibc);
cprtobj,
gprtobj,
prtobj : string[80];
reorder : boolean;
linklibc: boolean;
Function WriteResponseFile(isdll:boolean) : Boolean;
public
constructor Create;override;
procedure SetDefaultInfo;override;
procedure InitSysInitUnitName;override;
function MakeExecutable:boolean;override;
function MakeSharedLibrary:boolean;override;
procedure LoadPredefinedLibraryOrder; override;
end;
implementation
uses
SysUtils,
cutils,cfileutl,cclasses,
verbose,systems,globtype,globals,
symconst,script,
fmodule,
aasmbase,aasmtai,aasmcpu,cpubase,
cgbase,cgobj,cgutils,ogbase,ncgutil,
comprsrc,
rescmn, i_linux
;
{*****************************************************************************
TIMPORTLIBLINUX
*****************************************************************************}
procedure timportliblinux.generatelib;
var
i : longint;
ImportLibrary : TImportLibrary;
begin
for i:=0 to current_module.ImportLibraryList.Count-1 do
begin
ImportLibrary:=TImportLibrary(current_module.ImportLibraryList[i]);
current_module.linkothersharedlibs.add(ImportLibrary.Name,link_always);
end;
end;
{*****************************************************************************
TEXPORTLIBLINUX
*****************************************************************************}
procedure texportliblinux.setfininame(list: TAsmList; const s: string);
begin
{ the problem with not having a .fini section is that a finalization
routine in regular code can get "smart" linked away -> reference it
just like the debug info }
new_section(list,sec_fpc,'links',0);
list.concat(Tai_const.Createname(s,0));
inherited setfininame(list,s);
end;
{*****************************************************************************
TLINKERLINUX
*****************************************************************************}
Constructor TLinkerLinux.Create;
begin
Inherited Create;
if not Dontlinkstdlibpath Then
{$ifdef x86_64}
LibrarySearchPath.AddPath(sysrootpath,'/lib64;/usr/lib64;/usr/X11R6/lib64',true);
{$else}
{$ifdef powerpc64}
LibrarySearchPath.AddPath(sysrootpath,'/lib64;/usr/lib64;/usr/X11R6/lib64',true);
{$else powerpc64}
LibrarySearchPath.AddPath(sysrootpath,'/lib;/usr/lib;/usr/X11R6/lib',true);
{$endif powerpc64}
{$endif x86_64}
end;
procedure TLinkerLinux.SetDefaultInfo;
{
This will also detect which libc version will be used
}
const
{$ifdef i386} platform_select='-b elf32-i386 -m elf_i386';{$endif}
{$ifdef x86_64} platform_select='-b elf64-x86-64 -m elf_x86_64';{$endif}
{$ifdef powerpc} platform_select='-b elf32-powerpc -m elf32ppclinux';{$endif}
{$ifdef POWERPC64} platform_select='-b elf64-powerpc -m elf64ppc';{$endif}
{$ifdef sparc} platform_select='-b elf32-sparc -m elf32_sparc';{$endif}
{$ifdef arm} platform_select='';{$endif} {unknown :( }
{$ifdef m68k} platform_select='';{$endif} {unknown :( }
{$ifdef mips}
{$ifdef mipsel} platform_select='-EL';{$else}
platform_select='-EB';{$endif}
{$endif}
var
defdynlinker: string;
begin
with Info do
begin
ExeCmd[1]:='ld '+platform_select+' $OPT $DYNLINK $STATIC $GCSECTIONS $STRIP -L. -o $EXE';
{ when we want to cross-link we need to override default library paths }
if length(sysrootpath) > 0 then
ExeCmd[1]:=ExeCmd[1]+' -T';
ExeCmd[1]:=ExeCmd[1]+' $RES';
DllCmd[1]:='ld '+platform_select+' $OPT $INIT $FINI $SONAME -shared -L. -o $EXE $RES';
DllCmd[2]:='strip --strip-unneeded $EXE';
ExtDbgCmd[1]:='objcopy --only-keep-debug $EXE $DBG';
ExtDbgCmd[2]:='objcopy --add-gnu-debuglink=$DBG $EXE';
ExtDbgCmd[3]:='strip --strip-unneeded $EXE';
{$ifdef m68k}
{ experimental, is this correct? }
defdynlinker:='/lib/ld-linux.so.2';
{$endif m68k}
{$ifdef i386}
defdynlinker:='/lib/ld-linux.so.2';
{$endif}
{$ifdef x86_64}
defdynlinker:='/lib64/ld-linux-x86-64.so.2';
{$endif x86_64}
{$ifdef sparc}
defdynlinker:='/lib/ld-linux.so.2';
{$endif sparc}
{$ifdef powerpc}
defdynlinker:='/lib/ld.so.1';
{$endif powerpc}
{$ifdef powerpc64}
defdynlinker:='/lib64/ld64.so.1';
{$endif powerpc64}
{$ifdef arm}
{$ifdef FPC_ARMEL}
defdynlinker:='/lib/ld-linux.so.3';
{$else FPC_ARMEL}
defdynlinker:='/lib/ld-linux.so.2';
{$endif FPC_ARMEL}
{$endif arm}
{$ifdef mips}
defdynlinker:='/lib/ld.so.1';
{$endif mips}
{
Search order:
glibc 2.1+
uclibc
glibc 2.0
If none is found (e.g. when cross compiling) glibc21 is assumed
}
if fileexists(sysrootpath+defdynlinker,false) then
begin
DynamicLinker:=defdynlinker;
{$ifdef i386}
libctype:=glibc21;
{$else i386}
libctype:=glibc2;
{$endif i386}
end
else if fileexists(sysrootpath+'/lib/ld-uClibc.so.0',false) then
begin
dynamiclinker:='/lib/ld-uClibc.so.0';
libctype:=uclibc;
end
{$ifdef i386}
else if FileExists(sysrootpath+'/lib/ld-linux.so.1',false) then
begin
DynamicLinker:='/lib/ld-linux.so.1';
libctype:=glibc2;
end
{$endif i386}
else
begin
{ when no dyn. linker is found, we are probably
cross compiling, so use the default dyn. linker }
DynamicLinker:=defdynlinker;
{
the default c startup script is gcrt0.as on all platforms
except i386
}
{$ifdef i386}
libctype:=glibc21;
{$else i386}
libctype:=glibc2;
{$endif i386}
end;
end;
end;
procedure TLinkerLinux.LoadPredefinedLibraryOrder;
// put your linkorder/linkalias overrides here.
// Note: assumes only called when reordering/aliasing is used.
Begin
if not (cs_link_no_default_lib_order in current_settings.globalswitches) Then
Begin
LinkLibraryOrder.add('gcc','',15);
LinkLibraryOrder.add('c','',100);
LinkLibraryOrder.add('gmon','',120);
LinkLibraryOrder.add('dl','',140);
LinkLibraryOrder.add('pthread','',160);
end;
End;
Procedure TLinkerLinux.InitSysInitUnitName;
var
csysinitunit,
gsysinitunit : string[20];
hp : tmodule;
begin
hp:=tmodule(loaded_units.first);
while assigned(hp) do
begin
linklibc := hp.linkothersharedlibs.find('c');
if linklibc then break;
hp:=tmodule(hp.next);
end;
reorder := linklibc and ReOrderEntries;
if current_module.islibrary then
begin
sysinitunit:='dll';
csysinitunit:='dll';
gsysinitunit:='dll';
prtobj:='dllprt0';
cprtobj:='dllprt0';
gprtobj:='dllprt0';
end
else
begin
prtobj:='prt0';
sysinitunit:='prc';
case libctype of
glibc21:
begin
cprtobj:='cprt21';
gprtobj:='gprt21';
csysinitunit:='c21';
gsysinitunit:='c21g';
end;
uclibc:
begin
cprtobj:='ucprt0';
gprtobj:='ugprt0';
csysinitunit:='uc';
gsysinitunit:='ucg';
end
else
cprtobj:='cprt0';
gprtobj:='gprt0';
csysinitunit:='c';
gsysinitunit:='g';
end;
end;
if cs_profile in current_settings.moduleswitches then
begin
prtobj:=gprtobj;
sysinitunit:=gsysinitunit;
linklibc:=true;
end
else
begin
if linklibc then
begin
prtobj:=cprtobj;
sysinitunit:=csysinitunit;
end;
end;
sysinitunit:='si_'+sysinitunit;
end;
Function TLinkerLinux.WriteResponseFile(isdll:boolean) : Boolean;
Var
linkres : TLinkRes;
i : longint;
HPath : TCmdStrListItem;
s,s1,s2 : TCmdStr;
found1,
found2 : boolean;
linksToSharedLibFiles : boolean;
begin
result:=False;
{ set special options for some targets }
if cs_profile in current_settings.moduleswitches then
begin
if not(libctype in [glibc2,glibc21]) then
AddSharedLibrary('gmon');
AddSharedLibrary('c');
end;
{ Open link.res file }
LinkRes:=TLinkRes.Create(outputexedir+Info.ResName);
with linkres do
begin
{ Write path to search libraries }
HPath:=TCmdStrListItem(current_module.locallibrarysearchpath.First);
while assigned(HPath) do
begin
Add('SEARCH_DIR('+maybequoted(HPath.Str)+')');
HPath:=TCmdStrListItem(HPath.Next);
end;
HPath:=TCmdStrListItem(LibrarySearchPath.First);
while assigned(HPath) do
begin
Add('SEARCH_DIR('+maybequoted(HPath.Str)+')');
HPath:=TCmdStrListItem(HPath.Next);
end;
{ force local symbol resolution (i.e., inside the shared }
{ library itself) for all non-exorted symbols, otherwise }
{ several RTL symbols of FPC-compiled shared libraries }
{ will be bound to those of a single shared library or }
{ to the main program }
if (isdll) then
begin
add('VERSION');
add('{');
add(' {');
if not texportlibunix(exportlib).exportedsymnames.empty then
begin
add(' global:');
repeat
add(' '+texportlibunix(exportlib).exportedsymnames.getfirst+';');
until texportlibunix(exportlib).exportedsymnames.empty;
end;
add(' local:');
add(' *;');
add(' };');
add('}');
end;
StartSection('INPUT(');
{ add objectfiles, start with prt0 always }
if not (target_info.system in systems_internal_sysinit) and (prtobj<>'') then
AddFileName(maybequoted(FindObjectFile(prtobj,'',false)));
{ try to add crti and crtbegin if linking to C }
if linklibc and (libctype<>uclibc) then
begin
{ crti.o must come first }
if librarysearchpath.FindFile('crti.o',false,s) then
AddFileName(s);
{ then the crtbegin* }
if cs_create_pic in current_settings.moduleswitches then
begin
if librarysearchpath.FindFile('crtbeginS.o',false,s) then
AddFileName(s);
end
else
if (cs_link_staticflag in current_settings.globalswitches) and
librarysearchpath.FindFile('crtbeginT.o',false,s) then
AddFileName(s)
else if librarysearchpath.FindFile('crtbegin.o',false,s) then
AddFileName(s);
end;
{ main objectfiles }
while not ObjectFiles.Empty do
begin
s:=ObjectFiles.GetFirst;
if s<>'' then
AddFileName(maybequoted(s));
end;
EndSection(')');
{ Write staticlibraries }
if not StaticLibFiles.Empty then
begin
Add('GROUP(');
While not StaticLibFiles.Empty do
begin
S:=StaticLibFiles.GetFirst;
AddFileName(maybequoted(s))
end;
Add(')');
end;
// we must reorder here because the result could empty sharedlibfiles
if reorder Then
ExpandAndApplyOrder(SharedLibFiles);
// after this point addition of shared libs not allowed.
{ 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 (isdll) then
begin
Add('INPUT(');
Add(info.DynamicLinker);
Add(')');
end;
linksToSharedLibFiles := not SharedLibFiles.Empty;
if not SharedLibFiles.Empty then
begin
if (SharedLibFiles.Count<>1) or
(TCmdStrListItem(SharedLibFiles.First).Str<>'c') or
reorder then
begin
Add('INPUT(');
While not SharedLibFiles.Empty do
begin
S:=SharedLibFiles.GetFirst;
if (s<>'c') or reorder then
begin
i:=Pos(target_info.sharedlibext,S);
if i>0 then
Delete(S,i,255);
Add('-l'+s);
end
else
begin
linklibc:=true;
end;
end;
Add(')');
end
else
linklibc:=true;
if (cs_link_staticflag in current_settings.globalswitches) or
(linklibc and not reorder) then
begin
Add('GROUP(');
{ when we have -static for the linker the we also need libgcc }
if (cs_link_staticflag in current_settings.globalswitches) then
begin
Add('-lgcc');
if librarysearchpath.FindFile('libgcc_eh.a',false,s1) then
Add('-lgcc_eh');
end;
{ be sure that libc is the last lib }
if linklibc and not reorder then
Add('-lc');
Add(')');
end;
end;
{ objects which must be at the end }
if linklibc and (libctype<>uclibc) then
begin
if cs_create_pic in current_settings.moduleswitches then
found1:=librarysearchpath.FindFile('crtendS.o',false,s1)
else
found1:=librarysearchpath.FindFile('crtend.o',false,s1);
found2:=librarysearchpath.FindFile('crtn.o',false,s2);
if found1 or found2 then
begin
Add('INPUT(');
if found1 then
AddFileName(s1);
if found2 then
AddFileName(s2);
Add(')');
end;
end;
{Entry point. Only needed for executables, set on the linker command line for
shared libraries. }
if (not isdll) then
if (linksToSharedLibFiles and not linklibc) then
add('ENTRY(_dynamic_start)')
else
add('ENTRY(_start)');
{$ifdef x86_64}
{$define LINKERSCRIPT_INCLUDED}
add('SECTIONS');
add('{');
{Read-only sections, merged into text segment:}
if current_module.islibrary then
add(' . = 0 + SIZEOF_HEADERS;')
else
add(' PROVIDE (__executable_start = 0x0400000); . = 0x0400000 + SIZEOF_HEADERS;');
add(' . = 0 + SIZEOF_HEADERS;');
add(' .interp : { *(.interp) }');
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.dyn :');
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add(' *(.rel.init)');
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add(' KEEP (*(.init))');
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{.gnu.warning sections are handled specially by elf32.em.}
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add(' {');
add(' KEEP (*(.fini))');
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add(' . = ALIGN (0x1000) - ((0x1000 - .) & (0x1000 - 1));');
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add(' KEEP (*(.fpc .fpc.n_version .fpc.n_links))');
add(' KEEP (*(.gnu.linkonce.d.*personality*))');
add(' }');
add(' PROVIDE (_edata = .);');
add(' PROVIDE (edata = .);');
{$ifdef zsegment_threadvars}
add(' _z = .;');
add(' .threadvar 0 : AT (_z) { *(.threadvar .threadvar.* .gnu.linkonce.tv.*) }');
add(' PROVIDE (_threadvar_size = SIZEOF(.threadvar));');
add(' . = _z + SIZEOF (.threadvar);');
{$else}
add(' .threadvar : { *(.threadvar .threadvar.* .gnu.linkonce.tv.*) }');
{$endif}
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add(' .bss :');
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{Align here to ensure that the .bss section occupies space up to
_end. Align after .bss to ensure correct alignment even if the
.bss section disappears because there are no input sections.}
add(' . = ALIGN(32 / 8);');
add(' }');
add(' . = ALIGN(32 / 8);');
add(' PROVIDE (_end = .);');
add(' PROVIDE (end = .);');
{Stabs debugging sections.}
add(' .stab 0 : { *(.stab) }');
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add(' /* DWARF debug sections.');
add(' Symbols in the DWARF debugging sections are relative to the beginning');
add(' of the section so we begin them at 0. */');
add(' /* DWARF 1 */');
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add(' /* GNU DWARF 1 extensions */');
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add(' .debug_sfnames 0 : { *(.debug_sfnames) }');
add(' /* DWARF 1.1 and DWARF 2 */');
add(' .debug_aranges 0 : { *(.debug_aranges) }');
add(' .debug_pubnames 0 : { *(.debug_pubnames) }');
add(' /* DWARF 2 */');
add(' .debug_info 0 : { *(.debug_info .gnu.linkonce.wi.*) }');
add(' .debug_abbrev 0 : { *(.debug_abbrev) }');
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add(' /* SGI/MIPS DWARF 2 extensions */');
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add(' .debug_varnames 0 : { *(.debug_varnames) }');
add(' /DISCARD/ : { *(.note.GNU-stack) }');
add('}');
{$endif x86_64}
{$ifdef ARM}
if target_info.abi=abi_eabi then
begin
{ from GNU ld (CodeSourcery Sourcery G++ Lite 2007q3-53) 2.18.50.20070820 }
add('/* Script for -z combreloc: combine and sort reloc sections */');
add('OUTPUT_FORMAT("elf32-littlearm", "elf32-bigarm",');
add(' "elf32-littlearm")');
add('OUTPUT_ARCH(arm)');
add('SEARCH_DIR("=/usr/local/lib"); SEARCH_DIR("=/lib"); SEARCH_DIR("=/usr/lib");');
add('SECTIONS');
add('{');
add(' /* Read-only sections, merged into text segment: */');
add(' PROVIDE (__executable_start = 0x8000); . = 0x8000 + SIZEOF_HEADERS;');
add(' .interp : { *(.interp) }');
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add(' {');
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add(' *(.rela.text .rela.text.* .rela.gnu.linkonce.t.*)');
add(' *(.rela.fini)');
add(' *(.rela.rodata .rela.rodata.* .rela.gnu.linkonce.r.*)');
add(' *(.rela.data .rela.data.* .rela.gnu.linkonce.d.*)');
add(' *(.rela.tdata .rela.tdata.* .rela.gnu.linkonce.td.*)');
add(' *(.rela.tbss .rela.tbss.* .rela.gnu.linkonce.tb.*)');
add(' *(.rela.ctors)');
add(' *(.rela.dtors)');
add(' *(.rela.got)');
add(' *(.rela.bss .rela.bss.* .rela.gnu.linkonce.b.*)');
add(' }');
add(' .rel.plt : { *(.rel.plt) }');
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add(' .init :');
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add(' KEEP (*(.init))');
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add(' .plt : { *(.plt) }');
add(' .text :');
add(' {');
add(' *(.text .stub .text.* .gnu.linkonce.t.*)');
add(' KEEP (*(.text.*personality*))');
add(' /* .gnu.warning sections are handled specially by elf32.em. */');
add(' *(.gnu.warning)');
add(' *(.glue_7t) *(.glue_7) *(.vfp11_veneer)');
add(' } =0');
add(' .fini :');
add(' {');
add(' KEEP (*(.fini))');
add(' } =0');
add(' PROVIDE (__etext = .);');
add(' PROVIDE (_etext = .);');
add(' PROVIDE (etext = .);');
add(' .rodata : { *(.rodata .rodata.* .gnu.linkonce.r.*) }');
add(' .rodata1 : { *(.rodata1) }');
add(' .ARM.extab : { *(.ARM.extab* .gnu.linkonce.armextab.*) }');
add(' __exidx_start = .;');
add(' .ARM.exidx : { *(.ARM.exidx* .gnu.linkonce.armexidx.*) }');
add(' __exidx_end = .;');
add(' .eh_frame_hdr : { *(.eh_frame_hdr) }');
add(' .eh_frame : ONLY_IF_RO { KEEP (*(.eh_frame)) }');
add(' .gcc_except_table : ONLY_IF_RO { *(.gcc_except_table .gcc_except_table.*) }');
add(' /* Adjust the address for the data segment. We want to adjust up to');
add(' the same address within the page on the next page up. */');
add(' . = ALIGN(CONSTANT (MAXPAGESIZE)) + (. & (CONSTANT (MAXPAGESIZE) - 1));');
add(' /* Exception handling */');
add(' .eh_frame : ONLY_IF_RW { KEEP (*(.eh_frame)) }');
add(' .gcc_except_table : ONLY_IF_RW { *(.gcc_except_table .gcc_except_table.*) }');
add(' /* Thread Local Storage sections */');
add(' .tdata : { *(.tdata .tdata.* .gnu.linkonce.td.*) }');
add(' .tbss : { *(.tbss .tbss.* .gnu.linkonce.tb.*) *(.tcommon) }');
add(' .preinit_array :');
add(' {');
add(' PROVIDE_HIDDEN (__preinit_array_start = .);');
add(' KEEP (*(.preinit_array))');
add(' PROVIDE_HIDDEN (__preinit_array_end = .);');
add(' }');
add(' .init_array :');
add(' {');
add(' PROVIDE_HIDDEN (__init_array_start = .);');
add(' KEEP (*(SORT(.init_array.*)))');
add(' KEEP (*(.init_array))');
add(' PROVIDE_HIDDEN (__init_array_end = .);');
add(' }');
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add(' {');
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add(' KEEP (*(.fini_array))');
add(' KEEP (*(SORT(.fini_array.*)))');
add(' PROVIDE_HIDDEN (__fini_array_end = .);');
add(' }');
add(' .ctors :');
add(' {');
add(' /* gcc uses crtbegin.o to find the start of');
add(' the constructors, so we make sure it is');
add(' first. Because this is a wildcard, it');
add(' doesn''t matter if the user does not');
add(' actually link against crtbegin.o; the');
add(' linker won''t look for a file to match a');
add(' wildcard. The wildcard also means that it');
add(' doesn''t matter which directory crtbegin.o');
add(' is in. */');
add(' KEEP (*crtbegin.o(.ctors))');
add(' KEEP (*crtbegin?.o(.ctors))');
add(' /* We don''t want to include the .ctor section from');
add(' the crtend.o file until after the sorted ctors.');
add(' The .ctor section from the crtend file contains the');
add(' end of ctors marker and it must be last */');
add(' KEEP (*(EXCLUDE_FILE (*crtend.o *crtend?.o ) .ctors))');
add(' KEEP (*(SORT(.ctors.*)))');
add(' KEEP (*(.ctors))');
add(' }');
add(' .dtors :');
add(' {');
add(' KEEP (*crtbegin.o(.dtors))');
add(' KEEP (*crtbegin?.o(.dtors))');
add(' KEEP (*(EXCLUDE_FILE (*crtend.o *crtend?.o ) .dtors))');
add(' KEEP (*(SORT(.dtors.*)))');
add(' KEEP (*(.dtors))');
add(' }');
add(' .jcr : { KEEP (*(.jcr)) }');
add(' .data.rel.ro : { *(.data.rel.ro.local* .gnu.linkonce.d.rel.ro.local.*) *(.data.rel.ro* .gnu.linkonce.d.rel.ro.*) }');
add(' .dynamic : { *(.dynamic) }');
add(' .got : { *(.got.plt) *(.got) }');
add(' .data :');
add(' {');
add(' __data_start = . ;');
add(' *(.data .data.* .gnu.linkonce.d.*)');
{ extra by FPC }
add(' KEEP (*(.fpc .fpc.n_version .fpc.n_links))');
add(' KEEP (*(.gnu.linkonce.d.*personality*))');
add(' SORT(CONSTRUCTORS)');
add(' }');
add(' .data1 : { *(.data1) }');
add(' _edata = .; PROVIDE (edata = .);');
add(' __bss_start = .;');
add(' __bss_start__ = .;');
add(' .bss :');
add(' {');
add(' *(.dynbss)');
add(' *(.bss .bss.* .gnu.linkonce.b.*)');
add(' *(COMMON)');
add(' /* Align here to ensure that the .bss section occupies space up to');
add(' _end. Align after .bss to ensure correct alignment even if the');
add(' .bss section disappears because there are no input sections.');
add(' FIXME: Why do we need it? When there is no .bss section, we don''t');
add(' pad the .data section. */');
add(' . = ALIGN(. != 0 ? 32 / 8 : 1);');
add(' }');
add(' _bss_end__ = . ; __bss_end__ = . ;');
add(' . = ALIGN(32 / 8);');
add(' . = ALIGN(32 / 8);');
add(' __end__ = . ;');
add(' _end = .; PROVIDE (end = .);');
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(' /* SGI/MIPS DWARF 2 extensions */');
add(' .debug_weaknames 0 : { *(.debug_weaknames) }');
add(' .debug_funcnames 0 : { *(.debug_funcnames) }');
add(' .debug_typenames 0 : { *(.debug_typenames) }');
add(' .debug_varnames 0 : { *(.debug_varnames) }');
add(' /* DWARF 3 */');
add(' .debug_pubtypes 0 : { *(.debug_pubtypes) }');
add(' .debug_ranges 0 : { *(.debug_ranges) }');
add(' .stack 0x80000 :');
add(' {');
add(' _stack = .;');
add(' *(.stack)');
add(' }');
add(' .ARM.attributes 0 : { KEEP (*(.ARM.attributes)) KEEP (*(.gnu.attributes)) }');
add(' .note.gnu.arm.ident 0 : { KEEP (*(.note.gnu.arm.ident)) }');
add(' /DISCARD/ : { *(.note.GNU-stack) *(.gnu_debuglink) }');
add('}');
end
else
{$endif ARM}
{$ifndef LINKERSCRIPT_INCLUDED}
begin
{Sections.}
add('SECTIONS');
add('{');
{Read-only sections, merged into text segment:}
add(' PROVIDE (__executable_start = 0x010000); . = 0x010000 + SIZEOF_HEADERS;');
add(' .interp : { *(.interp) }');
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.dyn :');
add(' {');
add(' *(.rel.init)');
add(' *(.rel.text .rel.text.* .rel.gnu.linkonce.t.*)');
add(' *(.rel.fini)');
add(' *(.rel.rodata .rel.rodata.* .rel.gnu.linkonce.r.*)');
add(' *(.rel.data.rel.ro*)');
add(' *(.rel.data .rel.data.* .rel.gnu.linkonce.d.*)');
add(' *(.rel.tdata .rel.tdata.* .rel.gnu.linkonce.td.*)');
add(' *(.rel.tbss .rel.tbss.* .rel.gnu.linkonce.tb.*)');
add(' *(.rel.got)');
add(' *(.rel.bss .rel.bss.* .rel.gnu.linkonce.b.*)');
add(' }');
add(' .rela.dyn :');
add(' {');
add(' *(.rela.init)');
add(' *(.rela.text .rela.text.* .rela.gnu.linkonce.t.*)');
add(' *(.rela.fini)');
add(' *(.rela.rodata .rela.rodata.* .rela.gnu.linkonce.r.*)');
add(' *(.rela.data .rela.data.* .rela.gnu.linkonce.d.*)');
add(' *(.rela.tdata .rela.tdata.* .rela.gnu.linkonce.td.*)');
add(' *(.rela.tbss .rela.tbss.* .rela.gnu.linkonce.tb.*)');
add(' *(.rela.got)');
add(' *(.rela.bss .rela.bss.* .rela.gnu.linkonce.b.*)');
add(' }');
add(' .rel.plt : { *(.rel.plt) }');
add(' .rela.plt : { *(.rela.plt) }');
add(' .init :');
add(' {');
add(' KEEP (*(.init))');
add(' } =0x90909090');
add(' .plt : { *(.plt) }');
add(' .text :');
add(' {');
add(' *(.text .stub .text.* .gnu.linkonce.t.*)');
add(' KEEP (*(.text.*personality*))');
{.gnu.warning sections are handled specially by elf32.em.}
add(' *(.gnu.warning)');
add(' } =0x90909090');
add(' .fini :');
add(' {');
add(' KEEP (*(.fini))');
add(' } =0x90909090');
add(' PROVIDE (_etext = .);');
add(' .rodata :');
add(' {');
add(' *(.rodata .rodata.* .gnu.linkonce.r.*)');
add(' }');
{Adjust the address for the data segment. We want to adjust up to
the same address within the page on the next page up.}
add(' . = ALIGN (0x1000) - ((0x1000 - .) & (0x1000 - 1));');
add(' .dynamic : { *(.dynamic) }');
add(' .got : { *(.got) }');
add(' .got.plt : { *(.got.plt) }');
add(' .data :');
add(' {');
add(' *(.data .data.* .gnu.linkonce.d.*)');
add(' KEEP (*(.fpc .fpc.n_version .fpc.n_links))');
add(' KEEP (*(.gnu.linkonce.d.*personality*))');
add(' }');
add(' PROVIDE (_edata = .);');
add(' PROVIDE (edata = .);');
{$ifdef zsegment_threadvars}
add(' _z = .;');
add(' .threadvar 0 : AT (_z) { *(.threadvar .threadvar.* .gnu.linkonce.tv.*) }');
add(' PROVIDE (_threadvar_size = SIZEOF(.threadvar));');
add(' . = _z + SIZEOF (.threadvar);');
{$else}
add(' .threadvar : { *(.threadvar .threadvar.* .gnu.linkonce.tv.*) }');
{$endif}
add(' __bss_start = .;');
add(' .bss :');
add(' {');
add(' *(.dynbss)');
add(' *(.bss .bss.* .gnu.linkonce.b.*)');
add(' *(COMMON)');
{Align here to ensure that the .bss section occupies space up to
_end. Align after .bss to ensure correct alignment even if the
.bss section disappears because there are no input sections.}
add(' . = ALIGN(32 / 8);');
add(' }');
add(' . = ALIGN(32 / 8);');
add(' PROVIDE (_end = .);');
add(' PROVIDE (end = .);');
{Stabs debugging sections.}
add(' .stab 0 : { *(.stab) }');
add(' .stabstr 0 : { *(.stabstr) }');
add('}');
end;
{$endif LINKERSCRIPT_INCLUDED}
{ Write and Close response }
writetodisk;
Free;
end;
WriteResponseFile:=True;
end;
function TLinkerLinux.MakeExecutable:boolean;
var
i : longint;
binstr,
cmdstr : TCmdStr;
success : boolean;
DynLinkStr : string;
GCSectionsStr,
StaticStr,
StripStr : string[40];
begin
if not(cs_link_nolink in current_settings.globalswitches) then
Message1(exec_i_linking,current_module.exefilename^);
{ Create some replacements }
StaticStr:='';
StripStr:='';
GCSectionsStr:='';
DynLinkStr:='';
if (cs_link_staticflag in current_settings.globalswitches) then
StaticStr:='-static';
if (cs_link_strip in current_settings.globalswitches) and
not(cs_link_separate_dbg_file in current_settings.globalswitches) then
StripStr:='-s';
if (cs_link_map in current_settings.globalswitches) then
StripStr:='-Map '+maybequoted(ChangeFileExt(current_module.exefilename^,'.map'));
if create_smartlink_sections then
GCSectionsStr:='--gc-sections';
If (cs_profile in current_settings.moduleswitches) or
((Info.DynamicLinker<>'') and (not SharedLibFiles.Empty)) then
begin
DynLinkStr:='--dynamic-linker='+Info.DynamicLinker;
if cshared then
DynLinkStr:=DynLinkStr+' --shared ';
if rlinkpath<>'' then
DynLinkStr:=DynLinkStr+' --rpath-link '+rlinkpath;
End;
{ Write used files and libraries }
WriteResponseFile(false);
{ Call linker }
SplitBinCmd(Info.ExeCmd[1],binstr,cmdstr);
Replace(cmdstr,'$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);
{ create dynamic symbol table? }
if HasExports then
cmdstr:=cmdstr+' -E';
success:=DoExec(FindUtil(utilsprefix+BinStr),CmdStr,true,false);
{ Create external .dbg file with debuginfo }
if success and (cs_link_separate_dbg_file in current_settings.globalswitches) then
begin
for i:=1 to 3 do
begin
SplitBinCmd(Info.ExtDbgCmd[i],binstr,cmdstr);
Replace(cmdstr,'$EXE',maybequoted(current_module.exefilename^));
Replace(cmdstr,'$DBGFN',maybequoted(extractfilename(current_module.dbgfilename^)));
Replace(cmdstr,'$DBG',maybequoted(current_module.dbgfilename^));
success:=DoExec(FindUtil(utilsprefix+BinStr),CmdStr,true,false);
if not success then
break;
end;
end;
{ Remove ReponseFile }
if (success) and not(cs_link_nolink in current_settings.globalswitches) then
DeleteFile(outputexedir+Info.ResName);
MakeExecutable:=success; { otherwise a recursive call to link method }
end;
Function TLinkerLinux.MakeSharedLibrary:boolean;
var
InitStr,
FiniStr,
SoNameStr : string[80];
binstr,
cmdstr : TCmdStr;
success : boolean;
begin
MakeSharedLibrary:=false;
if not(cs_link_nolink in current_settings.globalswitches) then
Message1(exec_i_linking,current_module.sharedlibfilename^);
{ Write used files and libraries }
WriteResponseFile(true);
{ Create some replacements }
{ note: linux does not use exportlib.initname/fininame due to the custom startup code }
InitStr:='-init FPC_SHARED_LIB_START';
FiniStr:='-fini FPC_LIB_EXIT';
SoNameStr:='-soname '+ExtractFileName(current_module.sharedlibfilename^);
{ Call linker }
SplitBinCmd(Info.DllCmd[1],binstr,cmdstr);
Replace(cmdstr,'$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 current_settings.globalswitches) then
begin
{ only remove non global symbols and debugging info for a library }
Info.DllCmd[2]:='strip --discard-all --strip-debug $EXE';
SplitBinCmd(Info.DllCmd[2],binstr,cmdstr);
Replace(cmdstr,'$EXE',maybequoted(current_module.sharedlibfilename^));
success:=DoExec(FindUtil(utilsprefix+binstr),cmdstr,true,false);
end;
{ Remove ReponseFile }
if (success) and not(cs_link_nolink in current_settings.globalswitches) then
DeleteFile(outputexedir+Info.ResName);
MakeSharedLibrary:=success; { otherwise a recursive call to link method }
end;
{*****************************************************************************
Initialize
*****************************************************************************}
initialization
{$ifdef i386}
RegisterExternalLinker(system_i386_linux_info,TLinkerLinux);
RegisterImport(system_i386_linux,timportliblinux);
RegisterExport(system_i386_linux,texportliblinux);
RegisterTarget(system_i386_linux_info);
RegisterExternalLinker(system_x86_6432_linux_info,TLinkerLinux);
RegisterImport(system_x86_6432_linux,timportliblinux);
RegisterExport(system_x86_6432_linux,texportliblinux);
RegisterTarget(system_x86_6432_linux_info);
{$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}
{$ifdef powerpc64}
RegisterExternalLinker(system_powerpc64_linux_info,TLinkerLinux);
RegisterImport(system_powerpc64_linux,timportliblinux);
RegisterExport(system_powerpc64_linux,texportliblinux);
RegisterTarget(system_powerpc64_linux_info);
{$endif powerpc64}
{$ifdef alpha}
RegisterExternalLinker(system_alpha_linux_info,TLinkerLinux);
RegisterImport(system_alpha_linux,timportliblinux);
RegisterExport(system_alpha_linux,texportliblinux);
RegisterTarget(system_alpha_linux_info);
{$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}
{$ifdef MIPS}
{$ifdef MIPSEL}
RegisterExternalLinker(system_mipsel_linux_info,TLinkerLinux);
RegisterImport(system_mipsel_linux,timportliblinux);
RegisterExport(system_mipsel_linux,texportliblinux);
RegisterTarget(system_mipsel_linux_info);
{$else MIPS}
RegisterExternalLinker(system_mips_linux_info,TLinkerLinux);
RegisterImport(system_mips_linux,timportliblinux);
RegisterExport(system_mips_linux,texportliblinux);
RegisterTarget(system_mips_linux_info);
{$endif MIPSEL}
{$endif MIPS}
RegisterRes(res_elf_info,TWinLikeResourceFile);
end.
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