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Message-ID: <20161113024614.GQ1555@brightrain.aerifal.cx>
Date: Sat, 12 Nov 2016 21:46:14 -0500
From: Rich Felker <dalias@...c.org>
To: musl@...ts.openwall.com
Subject: Re: [PATCH v2] fix x86_64 sigreturn trampoline so gdb
recognizes it
On Sun, Nov 13, 2016 at 01:12:05AM +0100, Szabolcs Nagy wrote:
> gdb can only unwind across signal handlers if it recognizes the trampoline.
> on x86_64 this means the pc must be in a function called __restore_rt or
> if gdb cannot determine the symbol name the instruction sequence must match
> to what gdb expects.
>
> a nop is added before __restore_rt, the __restore alias is removed and
> size annotation is added to make sure gdb maps any pc value within
> __restore_rt unambigously to the __restore_rt symbol name.
>
> and the instruction sequence got fixed to match what gdb expects.
Thanks! Committed a patch based on this as discussed on irc.
Rich
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