Dmitry wrote:
what is the C-prologue?
Everything in the __reset_vector (WDT stop, initialisation of global
variables / heap if needed... ).
How __reset_vector can be computed?
Allocated? Linked?
The
return 1;
in __low_level_init is a
MOV #1,R12
After RET (back into __reset_vector) R12 is tested if 1 or 0:
CMP #0,R12
JEQ main ;return 0; -> skip C prologue
;else (return 1;) -> compute C prologue
Therefor, if "return 0;" is chosen __reset_vector exists (is linked),
but is not used. -> Unnessecary code, but flexibility for the user to
decide, if __reset_vector should be computed or not with only writing a
"return 1;" oder "return 0;".
Just look at any program compiled with IAR's (demo) compiler and you
will see this machnism.
But as I said: This information is additional - it is not my basic
problem. ;-)
Ralf
