What is "_bp" register in Cygnal port?

Kernel
1

nobody wrote on Wednesday, September 06, 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?

2

nobody wrote on Wednesday, September 06, 2006:

ref line 263 - looks like a mistake to me.  How did that get through?

3

nobody wrote on Wednesday, September 06, 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"