>> 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?
Actually, with the previous attempt we still didn't achieve the
original
goal of terminating the frame chain at kernel_thread_helper. Thus
another try (the seemingly odd extra push can be avoided once we
start using CFI expressions, which the unwinder currently doesn't
support):
ENTRY(kernel_thread_helper)
CFI_STARTPROC
pushl $0 # fake return address
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)
Jan
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