Re: [avr-gcc-list] WinAVR - gcc 3.4.6 - AVR Studio - DuoCore PC - Stackpointer problem

[Steffen Rose]

On Saturday 25 November 2006 23:15, Joerg Wunsch wrote:
> That would suggest you've been declaring a *lot* of local
> variables.

Now we can create this problem also on our correct system.
This code will create, is the option -fstack-check is enabled:

/* epilogue: frame size=0 */
/* epilogue: noreturn */
/* epilogue end (size=0) */
/* function validCobId size 58 (58)
.LFE14:
        .size   validCobId, .-valid
.global FlushMbox
        .type   FlushMbox, @functio
FlushMbox:
.LFB15:
.LM113:
/* prologue: frame size=0 */
        push r17
        push r28
        push r29
/* prologue end (size=3) */
        in r30,__SP_L__
        in r31,__SP_H__
        subi r30,lo8(-(-4170))
        sbci r31,hi8(-(-4170))
        st Z,__zero_reg__
.LM114:

How do the Stackchecking work? What should the command
        st Z,__zero_reg__
do?

-- 
Regards
Steffen Rose