[Simulavr-devel] probably simulavr/gdb bug

[ken restivo]

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well, i've isolated this down to a small test program. it looks like the 
execution bug was mine, but the gdb problem looks like it's in 
simulavr/gdbserver.c somewhere.

basically, if you step through it in avr-gdb, the call to calledFunc looks 
right, but once you step into calledFunc, then reports garbage values for the 
passed-in parameters. the registers themselves look correct in disp.

i am using GNU gdb 5.1-avr-patch-0.0-pre8, and the latest cvs of simulavr. my 
toolchain is gcc 3.01, and the 20010821 libc.

/* test program for gdb weirdness */

#include <io.h>
#include <stdlib.h>

struct teststruct {
    int junk;
    void (*funky)(void);
    int morejunk;
};

volatile void
idler()
{
    outp('I', PORTD); 
    outp('\n', PORTD);  

}


volatile void
calledFunc(struct teststruct * thr, int pri, void (*funk)() , int stackSize )
{
    outp('C', PORTD); 
    outp('\n', PORTD);  
    funk();
}

int
main(int argc, char ** argv)
{
    struct teststruct * ith;

    ith = malloc(sizeof(struct teststruct));

    outp(0xFF, DDRD);

    calledFunc(ith, 0, idler, 0);
    
    while(1);

    return(0);
} /* END MAIN */

/* EOF */


- -ken

- -- 
- ------------------
One world. Many gods. Plenty for everyone.


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