The Xmega support involves a convoluted mechanism to update the SP after a
var-arg procedure call.
return (AS2 (mov,__tmp_reg__,r24) CR_TAB
+ AS2 (ldi,r24,0xD8)
CR_TAB
+ AS2 (out,__CCP__,r24)
CR_TAB
+ AS2 (mov,r24,__tmp_reg__)
CR_TAB
+ AS2 (out,__SP_H__,%B1)
CR_TAB
+ AS2 (out,__SP_L__,%A1));
I presume the CPP was used was to get atomic update of the SP. however, I
am not finding anything in the documentation that indicates that is
necessary. In fact, the XMEGA A manual, page9, section 3.8 states that
NOTHING is needed other than writing the SPL first (writing SPL disables
interrupts for four cycles). So what should really happen is:
return ( AS2 (out,__SP_L__,%B1)
CR_TAB
+ AS2 (out,__SP_H__,%A1));
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