🚀 go-pugleaf

Hi,

In our SPARC multiprocessor we will be using Alternate Space Load/Store
instructions for testing the hardware and for doing some IO operations.
I have been trying to write macros which will generate assembly code for these
alternate space load/store instructions. I use asm command  in these macros.

Below are my macros and a small test program. Is it correct? It seems it is
generating correct assembly code for the test program, but I am afraid that
in a larger program the macros may not produce correct code (I don't know the
details of gcc).

One other thing is that I explicitly used  register %g0 to construct the 
address. Is there a better way?

Thanks for your comments.

Koray
oner@paris.usc.edu

/*-----------------------------------------------------------------------*/
#define lda(asi,addr,var) \
   asm volatile ("lda [%%g0+%1]%2, %0" : "=&r" ((int) (var)) \
		 : "r" ((unsigned *) (addr)), "i" ((int) asi))

#define sta(asi,addr,var) \
   asm volatile ("sta %0,[%%g0+%1]%2" :  : "r" ((int) (var)), \
		 "r" ((unsigned *) (addr)), "i" ((int) asi))


main()
{
  int i;
  unsigned *addr = 0;

  lda(5, 0, i);
  sta(5, 4, i);
  printf("%d\n",i);

}