Re: [PATCH] uprobes/core: handle breakpoint and signal step exception.

[Ingo Molnar <mingo@elte.hu>]

* Ingo Molnar <mingo@elte.hu> wrote:

> I.e. you could drop this patch altogether:
> 
>   x86/trivial: Fix 'old_rsp' undefined build failure when including asm/compat.h
> 
> And rework the is_ia32_compat_task() patch to use another 
> header and to use the is_32bit_task() name. Also, you should 
> double check whether the x32 execution model needs special 
> consideration as well:
> 
>  #define TIF_IA32		17	/* IA32 compatibility process */
>  #define TIF_X32		30	/* 32-bit native x86-64 binary */
> 
> otherwise uprobe will not work with x32 tasks properly.

Given that x32 tasks are using native 64-bit syscalls, what you 
need is the is_ia32_task() check. We have that in -tip already, 
in compat.h. If uprobes uses that definition then uprobes will 
be able to probe x32 tasks as well.

To make it available to uprobes please move is_ia32_task() to 
processor.h and make it return 1 on i386 kernels. This should be 
a very simple patch - and that's all that is needed.

Thanks,

	Ingo