On 28/03/2016 20:42, Sergey Fedorov wrote: > On 17/03/16 16:46, sergey.fedo...@linaro.org wrote: >> First the translation block is invalidated, for which a simple write >> to tb->pc is enough. This means that cpu-exec will not pick up anymore >> the block, though it may still execute it through chained jumps. This >> also replaces the NULLing out of the pointer in the CPUs' local cache. > > Although, using 'tb->pc' to mark a TB as invalid is probably not such a > good idea. There may be some cases when PC could become equal to -1. For > example, ARMv6-M uses PC >= 0xFFFFFFF0 to perform exception return. So > we'd better introduce a separate 'tb->valid' or 'tb->invalid' flag.
It is also possible to use tb->flags for that. I suspect that all-ones tb flags is never valid, but it could also be a #define. Paolo
