Re: [Qemu-devel] [PATCH v2] Pass semihosting exit code back to system.

[Paolo Bonzini]

On 18/11/2014 23:50, Peter Maydell wrote:
> On 18 November 2014 21:19, Paolo Bonzini <address@hidden> wrote:
>> The isa-debugexit and testdev character device do not exit with exitcode
>> 0, in order to distinguish an exit from a system power down; the
>> low-order bit is always 1.  The return values then should be 1 and 3
>> instead of 0 and 1.
> 
> Semihosting isn't a test device -- it's an implementation of an
> ABI (mostly intended for almost-but-not-quite-bare-metal programs).
> I'm pretty sure that exiting anything except 0 on a successful
> exit request by the guest will break usage of QEMU in scenarios
> like the gcc test suite.

Thanks!  (FWIW, I don't find the behavior of those devices very useful
either... just mentioning them for the sake of consistency).

Paolo