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Date: Sun, 13 Nov 2005 23:58:00 -0000
From: Jim Blandy <jimb@red-bean.com>
To: Andrew STUBBS <andrew.stubbs@st.com>, gdb-patches@sources.redhat.com
Subject: Re: [SH][PATCH] Disable ABI frame sniffer
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References: <43722DEF.8060300@st.com> <20051110013122.GB11334@nevyn.them.org>
	 <437321EE.7010904@st.com> <20051110133905.GB21420@nevyn.them.org>
	 <43735A1D.6010406@st.com> <20051110231336.GB3195@nevyn.them.org>
	 <4374863D.60601@st.com> <20051113183624.GE3599@nevyn.them.org>
X-SW-Source: 2005-11/txt/msg00178.txt.bz2

On 11/13/05, Daniel Jacobowitz <drow@false.org> wrote:
> Instead of whatever C language routine you use to start threads, start
> them using an assembly wrapper.  Have it set up a non-unwindable frame
> using DWARF2 CFI as mentioned in one of my earlier postings in this
> thread.  You can do this easily by marking the return address column as
> undefined.  Then have it call the C thread start routine.  GDB will
> cleanly terminate the backtrace right there  You'll have one more frame
> in your stack, but it will be a real frame.

There's an example of how to do this in libgloss/m32c/crt0.S (and
other places, I'm sure).