MCPR_SCRATCH_BASE
if (trace_shmem_base < MCPR_SCRATCH_BASE(bp) + MCPR_TRACE_BUFFER_SIZE ||
trace_shmem_base >= MCPR_SCRATCH_BASE(bp) +
mark = MCPR_SCRATCH_BASE(bp) + ((mark + 0x3) & ~0x3) - 0x08000000;