Re: [Qemu-devel] [PATCH] ARM: semi-hosting support for stderr

[Christophe Lyon <christophe.lyon@st.com>]

On 14.11.2010 18:50, Peter Maydell wrote:
> Although newlib/libgloss use different modes for opening stdout
> and stderr, the ARM C library implementation does not, for
> instance; so your patch is relying on a detail of implementation of
> a particular semihosting user. So I don't think we can apply this
> patch, because it could break other (nonlibgloss) users of
> semihosting.
> 

Thanks for your answer.

I think we could argue it's a bug in the ARM semihosting spec, so maybe
we could request them to change this. However, I am unsure how to do
this efficiently, as I recently tried with little success to have them
change the "angel_SWIreason_ReportException" such that at least
ADP_Stopped_AplicationExit can have the program return code as an extra
parameter... (anyway I have another small Qemu patch to handle this
situation by returning the contents of r0 when the program entered
exit(). I can submit it if someone is willing to review it).

Christophe.