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

From: Jan Kratochvil
Subject: Re: [Libunwind-devel] question about is_signal_frame and usage
Date: Tue, 27 Feb 2007 23:59:39 +0100
User-agent: Mutt/1.5.13 (2007-02-12)

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.


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