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[Bug 1000660] ARM HAL breaks on spurious interrupt
- From: bugzilla-daemon at bugs dot ecos dot sourceware dot org
- To: backlog at bugs dot ecos dot sourceware dot org
- Date: Wed, 23 Feb 2011 15:39:25 +0000
- Subject: [Bug 1000660] ARM HAL breaks on spurious interrupt
- Auto-submitted: auto-generated
- References: <bug-1000660-776@http.bugs.ecos.sourceware.org/>
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Morten Lave <ml@tctechnologies.tc> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |ml@tctechnologies.tc
--- Comment #4 from Morten Lave <ml@tctechnologies.tc> 2011-02-23 15:39:22 GMT ---
I have seen the same problem and it is in both eCos 2.x and 3.0. We have
created a fix which has worked well for 2.x and this as far as i can see works
for 3.0 as well. The fix seems to be along the same lines as what has allegedly
been done in eCosPro.
We have replaced:
// The return value from the handler (in r0) will indicate whether a
// DSR is to be posted. Pass this together with a pointer to the
// interrupt object we have just used to the interrupt tidy up routine.
// don't run this for spurious interrupts!
cmp v1,#CYGNUM_HAL_INTERRUPT_NONE
beq 17f
ldr r1,.hal_interrupt_objects
With
// The return value from the handler (in r0) will indicate whether a
// DSR is to be posted. Pass this together with a pointer to the
// interrupt object we have just used to the interrupt tidy up routine.
// don't run this for spurious interrupts!
cmp v1,#CYGNUM_HAL_INTERRUPT_NONE
//ML23-02-2011, even spurious interrupts must unlock scheduler
moveq r0,#0
ldr r1,.hal_interrupt_objects
This will make sure that interrupt_end is called even for a spurious interrupt
but no DSR is posted as r0 is zero and therefore the vector is ignored.
This fix replaces a conditional branch with a conditional move so it would not
add any latency to regular interrupt processing.
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