Does Valgrind support modify_ldt() syscall on amd64-linux platform?

[scameung]

Hi,

I tried to run a amd64-linux program on valgrind 3.5.0, but valgrind said modify_ldt syscall is missing. After checking the 3.5.0 source code, I think Valgrind 3.5.0 does not support modify_ldt amd64-linux.

Is there a plan to implement it recently? Or how hard is it to support modify_ldt on amd64-linux?

If it is not hard, I'll tried to port x86 support to amd64 by myself. However I looked at VEX/pub/libvex_guest_amd64.h, but it seems that VexGuestAMD64State does not have a full support for segmentation registers...

Your comments are really appreciated.

Thanks!

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[tom fogal-3]

yami <yamisoe@...> writes:
> I tried to run a amd64-linux program on valgrind 3.5.0, but valgrind
> said modify_ldt syscall is missing. After checking the 3.5.0 source
> code, I think Valgrind 3.5.0 does not support modify_ldt amd64-linux.

http://valgrind.org/docs/manual/dist.readme-missing.html

See: "Writing your own syscall wrappers (see below for ioctl wrappers)"

-tom

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On 28/09/09 04:54, tom fogal wrote:
> yami<yamisoe@...>  writes:
>> I tried to run a amd64-linux program on valgrind 3.5.0, but valgrind
>> said modify_ldt syscall is missing. After checking the 3.5.0 source
>> code, I think Valgrind 3.5.0 does not support modify_ldt amd64-linux.
>
> http://valgrind.org/docs/manual/dist.readme-missing.html
>
> See: "Writing your own syscall wrappers (see below for ioctl wrappers)"

Perfectly good advice for a "normal" system call, but modify_ldt is very
much a special case and is not at all simple to implement.

Ticket https://bugs.kde.org/show_bug.cgi?id=175985 is already open for
this. Using modify_ldt on x86_64 is pretty unusual though so it doesn't
look like there has been much headway in fixing it.

Tom

--
Tom Hughes (tom@...)
http://www.compton.nu/

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