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Date:      Tue, 7 Feb 2017 12:55:51 -0600
From:      John Marino <freebsdml@marino.st>
To:        freebsd-arm@freebsd.org
Cc:        Andreas Tobler <andreastt@gmail.com>
Subject:   Re: ARM64: PC/IP not saved in signal frame
Message-ID:  <86279411-3979-edab-7ba2-4a1e3fa6429e@marino.st>
In-Reply-To: <530c18cd-d50d-4709-a0ca-22324a0cb592@marino.st>
References:  <530c18cd-d50d-4709-a0ca-22324a0cb592@marino.st>

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On 2/7/2017 12:47, John Marino wrote:
> Hi guys,
> I've been struggling to provide unwind support on the aarch64-*-freebsd*
> target of FreeBSD.  The only working example on this arch is
> aarch64-linux (attached).  I think I'm 99% done with the freebsd version
> (attached) but the last value that needs to be pass to the
> _Unwind_FrameState is the program counter offset.
>
> I know the PC is not register-based on aarch64.  Linux still saves the
> value in the signal context, but AFAICT FreeBSD does not.
>
> Can somebody
> A) confirm that the program counter is missing from the saved signal
> context
> B) confirm that it needs to be added for proper signal frame unwinding?
>
> Alternatively, maybe somebody can figure out a solution given the
> current freebsd structures, but I'm losing hope on that one. (line 99)

Apparently attachments are stripped out on this mail list.
You can see the headers here:
https://leaf.dragonflybsd.org/~marino/linux-unwind.h
https://leaf.dragonflybsd.org/~marino/freebsd-unwind.h

John



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