Re: [Libunwind-devel] question about is_signal_frame and usage

[Jan Kratochvil]

On Tue, 27 Feb 2007 23:19:13 +0100, Corey Ashford wrote:
...
> This business of the augmentation string in the CIE specifying a signal 
> frame is news to me.  I didn't see that in the 64-bit PowerPC ELF ABI or 
> the DWARF 2.0 doc.

Neither found in DWARF 3 nor AMD64 ABI 0.98.  It is just somehow known. :-)


> How does source code specify what augmentation > string to use in the CIE?

GAS supports it by its pseudo-op.
It is just a virtual boolean marked by the "S" char in the augmentation string.

        7.19 `.cfi_signal_frame'
        ========================

        Mark current function as signal trampoline.


Regards,
Jan