On 05/04/2011 09:33 AM, Richard Henderson wrote: > This is a case where you almost certainly want to check this > condition inside QEMU and translate the opcode differently. > > See cpu_get_tb_cpu_state, which sets bits in *flags. These > flags can then be checked in tb->flags while translating. > At which point you'd avoid all the conditionalization on > the value in PS here in check_privilege and merely issue > the exception_cause. > > The ARM port is a good example for testing these sorts of bits.
Actually, while the tb flags are useful, privileged instructions are usually checked by testing mmu_index, since we already have to generate different code for the TB based on which TLB entry we need to access. r~
