Re: [Valgrind-users] Re: [uml-devel] Re: UML and valgrind

[Jeff Dike <jdike@addtoit.com>]

dbahi@enterasys.com said:
> ugh, so close - it bails - stopped by clone() !?!!?? : 

OK, there were a bunch of problems that were fixed when me, Jeremy, and Julian
were working on this.  The clone one seems to have not made it.  I've lost the
patches I had, but I dug this out of a piece of email.  It applies to 
coregrind/vg_syscalls.c:

> @@ -39,6 +40,10 @@
>  # code which copies from baseBlock before the call, into
>  # m_state_static, and back afterwards.
>  
> +.section .data
> +save_ip:
> +        .long   0
> +
>  VG_(do_syscall):
>         # Save all the int registers of the real machines state on the
>         # simulators stack.
> @@ -80,10 +85,27 @@
>         movl    VG_(m_state_static)+48, %esi
>         movl    VG_(m_state_static)+52, %edi
>  
> +       cmpl    $__NR_clone, %eax
> +       jne     not_clone
> +
> +       pushl   %eax
> +       movl    VG_(m_state_static)+60, %eax
> +       movl    %eax, save_ip
> +       popl    %eax
> +
> +       int     $0x80
> +
> +       cmpl    $0, %eax
> +       jne     parent_finish
> +
> +       jmp     *save_ip
> +
> +not_clone:
>         # esp now refers to the simulatees stack
>         # Do the actual system call
>         int     $0x80

It handles the clone by calling clone itself, creating a new valgrind thread
which will go on grinding the new UML thread.

Also, I saw this:

> 	valgrind: the `impossible' happened:
> 	   Unhandled REPE case

If you see this, check that you have
	http://www.goop.org/~jeremy/valgrind/76-repe-scas.patch
and apply if not.

				Jeff



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