Re: [Qemu-devel] [PATCH 2/2][SPARC] Fix TA0_Shutdown feature

[Blue Swirl]

On Wed, May 18, 2011 at 4:17 PM, Julien Grall <address@hidden> wrote:
> On Tue, May 17, 2011 at 9:57 PM, Blue Swirl <address@hidden> wrote:
>> On Tue, May 17, 2011 at 6:32 PM, Julien Grall <address@hidden> wrote:
>>> Fix TA0_SHUTDOWN feature
>>
>> But what would be the bug?
>
> We try to add RTEMS's support on leon platform for QEMU. RTEMS uses
> software trap 0 for various syscall.
> The current implementation of TA0_SHUTDOWN breaks the RTEMS boot.
>
>> No, this would actually be just opposite to how QEMU works.
>> Performance comes from doing more work at translation time in order to
>> save time during executing the generated code.
>
> I agree, this solution slows down the execution, but I didn't find
> another solution to fix this bug.

You should retain the feature check in translate.c but add a leon
specific helper in place of helper_shutdown, which can check for
psret.

It would be also possible to generate code for the psret check if the
helper overhead were an issue.