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Date: Tue, 12 Jul 2005 17:34:00 -0000
From: Daniel Jacobowitz <drow@false.org>
To: Andrew STUBBS <andrew.stubbs@st.com>
Cc: GDB <gdb@sources.redhat.com>
Subject: Re: Invalid registers
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	GDB <gdb@sources.redhat.com>
References: <op.stq9spovo669wz@terrorhawk.bri.st.com> <20050711154926.GB30937@nevyn.them.org> <op.sts5l3b3o669wz@terrorhawk.bri.st.com>
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On Tue, Jul 12, 2005 at 05:04:41PM +0100, Andrew STUBBS wrote:
> Thank you. This has helped me find the right stuff to look at.
> 
> I do not think I actually want to use dwarf2_frame_set_init_reg. The  
> compiler (GCC 3.4.3) produces CFI information which I think ought to be  
> enough.
> 
> The function execute_cfa_program in dwarf2-frame.c appears to load all the  
> relevant data (setting breakpoints in strategic places show this). If I  
> use 'up' and 'info registers' I see the values change, which shows that  
> the CFI data has been loaded (doesn't it?). It just appears that the 'how'  
> field from the CFA is being ignored when the values are printed. Setting  
> 'how' via dwarf2_frame_set_init_reg is not ignored however. It must be  
> being reset, or perhaps not copied in the first place.
> 
> Any clues?

Sorry, not enough information - I'd need specifics.  GCC's CFI
generally does not represent call-clobbered registers; waste of space
for a runtime unwinder.

-- 
Daniel Jacobowitz
CodeSourcery, LLC