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What is "_bp" register in Cygnal port?

Posted by Nobody/Anonymous on September 6, 2006
Hi all,
I look in the port.c of the Cygnal port and see:
push _bp
...
pop _bp
What is register is that?
One more thing, in *pxPortInitialiseStack() function, line 263:
*pxTopOfStack++;
I think it must be:
pxTopOfStack++;
Am i right?

RE: What is "_bp" register in Cygnal port?

Posted by Nobody/Anonymous on September 6, 2006
ref line 263 - looks like a mistake to me. How did that get through?

RE: What is "_bp" register in Cygnal port?

Posted by Nobody/Anonymous on September 6, 2006
From the SDCC manual: "_bp is the stack frame pointer and is used to compute the offset into the stack for parameters
and local variables"


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