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Message
From: Carlos Sánchez de La Lama <csanchez@t...>
Date: 03 Jul 2003 19:46:23 +0200
Subject: [openrisc] l.sys on delay slot
Hi everybody,
According to the manual, when a l.sys instruction in a delay slot is
executed EPCR is loaded with address of corresponding jump instruction.
However, this will result on an infinite loop, as the l.sys will be
executed again. On a l.trap this is OK as traps are usually software
breakpoints and the trap instruction will be removed by the service
routine.
Althought the routine servicing system calls could detect whether the
l.sys was on a delay slot (by means of SR[DSX]), I think it will be
better if EPCR was loaded with jump destination address in such cases.
Please post your comments.
Best regards,
Carlos
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