Re: [PATCH for review] [127/145] i386: movekernel_thread_helper into entry.S

[Jan Beulich]

>> And this too - the value now in %eax has no relation with the
>> value known by the caller of this routine (which doesn't expect
>> any return from here anyway).
>
>Ok, but somehow it needs to be annotiated so that the unwinder stops
>and doesn't fall back. Can you please send a replacement patch that 
>does this correctly? 

I would do it this way (untested):

ENTRY(kernel_thread_helper)
	CFI_STARTPROC
	movl %edx,%eax
	pushl %edx
	CFI_ADJUST_CFA_OFFSET 4
	call *%ebx
	pushl %eax
	CFI_ADJUST_CFA_OFFSET 4
	call do_exit
	CFI_ENDPROC
ENDPROC(kernel_thread_helper)

(i.e. tracking the stack pointer movement, but not the register values
other than the return address)

Jan
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