Re: [Gems-users] Using Magic Instruction on sparc64-linux

[Dan Gibson <degibson@xxxxxxxx>]

Gene,

Your problem seems to be related to Simics. To my knowledge, we have 
only used Simics with the sarek (sparc/solaris) target, and you 
mentioned you are using bagel. Since bagel is a sparc machine, I'm 
surprised that the __sparc symbol was undefined. You might try passing 
-D__sparc to your compiler to force the symbol to be defined, but I am 
not clear as to whether the magic breakpoint interface is the same for 
bagel as for sarek.
As I look the the magic-instruction.h file provided with Simics 2.2.19, 
I notice that they intend to use "sethi 'n' %g0" as a magic breakpoint, 
where n is an integer greater than zero. You might try using '1' rather 
than '0' in your example program below and see if that works.
In the past, I know there have been some reordering concerns with magic 
breakpoints as well. Optimizing compilers may reorder or remove 
instructions--try compiling without optimiziations if you have them enabled.
I also would suggest you have a look at the Simics documentation, and/or 
the Simics website (www.simics.net).
Regards,
Dan

Gene Michael Kishinevsky wrote:

> Hi all,
>
> We've tried using the magic instruction today on our simulated system with
> no success. We're using the bagle system provided by Simics, which is a sun
> sparc64 machine with linux on it. I used the magic-breakpoint-enable command
> in Simics and then ran my simple program on the simulated machine. However,
> we never got the simulation to stop. We tried changing the instructions
> around and even using the magic-instruction.h library definition instead of
> our own. When using the library we got an "unsupported architecture" error
> from the following section of code in the magic library.
>
> #else  /* !__sparc && !__i386 && !__powerpc__ */
> #error "Unsupported architecture"
> #endif /* !__sparc && !__i386 && !__powerpc__ */
>
> I've included our test program below. If anyone has any suggestions we'd be
> very grateful.
>
> Thanks a lot.
>
> -Gene
>
>
> #include <stdio.h>
> //#include "magic-instruction.h"
>
> #define MAGIC_INSTRUCTION do {    \
>   __asm__ __volatile__ ("sethi 0, %g0");  \
> } while (0)
>
> main() {
>  printf("Hello world.");
>  MAGIC_INSTRUCTION;
>  printf("After magic I should have stoppped!");
> }
>
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