I need to access the saved SFR registers from
an interrupt handler (mcs51) - how can I do that?
I also need to access the return address, and
modify it, if need be.
Some compilers I used, allowed to do this by
defining the function arguments for the interrupt
handler, but sdcc explicitly prohibits that.
So what to do? The quick look into the doc
didn't reveal anything sensible...
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