[ECOS] question about isr function signature (profiling)

["Yuxin Jiang" <yjiang at matrics dot com>]

For ARM7TDMI core, I want to define a ISR service routine, as following:

// ISR.
static cyg_uint32
timer_isr(CYG_ADDRWORD vector, CYG_ADDRWORD data, HAL_SavedRegisters *regs)
{

    HAL_INTERRUPT_ACKNOWLEDGE (CYGNUM_HAL_INTERRUPT_PROFILE_TIMER);
    __profile_hit(regs->pc);

    return CYG_ISR_HANDLED;
}


My question is: is the signature for the timer_isr correct?

To be specific, is it correct to declare that there is a third parameter for
a isr, and this third parameter is a pointer to the HAL_SavedRegisters
structure, and the structure has correct (updated) context registers value
at the moment the interrupt occurs?

As you can see, I am trying to do profiling. But I am not sure I actually
get the correct pc value passed into the __profile_hit() function call.

Any insight is appreciated.


Yuxin Jiang


-- 
Before posting, please read the FAQ: http://ecos.sourceware.org/fom/ecos
and search the list archive: http://ecos.sourceware.org/ml/ecos-discuss