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Re: [Qemu-devel] [PATCH v2] Pass semihosting exit code back to system.
From: |
Paolo Bonzini |
Subject: |
Re: [Qemu-devel] [PATCH v2] Pass semihosting exit code back to system. |
Date: |
Wed, 19 Nov 2014 10:34:14 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.2.0 |
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