SPARC only: No 64-bit Executable Code Between 0 and 2G Virtual

To prevent user programs from encountering a bug that causes certain 64-bit user applications to stall when executing instructions loaded between virtual addresses 0 (0x0) and 2G (0x80000000), the system automatically ensures that 64-bit applications do not load instructions in that range. This does not reduce the amount of physical memory available to applications, nor does it prevent user data from being loaded in that range. 32-bit applications are not affected.