On 03.10.2010 13:59, Florian Klämpfl wrote:
Am 03.10.2010 11:37, schrieb Sven Barth:
Hello together!
While I looked for a solution for the bug report about external threads
on Windows ( http://bugs.freepascal.org/view.php?id=17300 ), I found the
following code in SysRelocateThreadVar in rtl/win/systhrd.inc:
==== begin ====
{$ifdef dummy}
{ it least in the on windows 7 x64, this still doesn't not work,
fs:(0x2c) is
self referencing on this system (FK)
MVC: It also does not work on Windows Vista 32-bit, Home
Premium, SP 1. Results in a crash}
asm
movl TLSKey,%edx
movl %fs:(0x2c),%eax
orl %eax,%eax
jnz .LAddressInEAX
{ this works on Windows 7, but I don't know if it works on
other OSes (FK) }
movl %fs:(0x18),%eax
movl 0xe10(%eax,%edx,4),%eax
jmp .LToDataIndex
.LAddressInEAX:
movl (%eax,%edx,4),%eax
.LToDataIndex:
movl %eax,dataindex
end;
if DataIndex=nil then
begin
errorsave:=GetLastError;
SysAllocateThreadVars;
DataIndex:=TlsGetValue(tlskey);
SetLastError(errorsave);
end;
{$else win32}
==== end ====
According to http://en.wikipedia.org/wiki/X86-64#Windows 64-bit Windows
uses GS instead of FS for the TIB. This might be the reason that the
code doesn't work on 64-bit Windows.
Also for 32 bit programs? The code above is only used by 32 bit programs.
No, not for 32 bit programs. -.-
Note to self: Study foreign code more intensively.
Regards,
Sven
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