On Fri, Sep 08, 2017 at 04:34:21PM -0600, Rob Gardner wrote: > Load instructions using ASI_PNF or other no-fault ASIs should not > cause a SIGSEGV or SIGBUS. > > A garden variety unmapped address follows the TSB miss path, and when > no valid mapping is found in the process page tables, the miss handler > checks to see if the access was via a no-fault ASI. It then fixes up > the target register with a zero, and skips the no-fault load > instruction. > > But different paths are taken for data access exceptions and alignment > traps, and these do not respect the no-fault ASI. We add checks in > these paths for the no-fault ASI, and fix up the target register and > TPC just like in the TSB miss case. > > Signed-off-by: Rob Gardner <rob.gardner@xxxxxxxxxx> Looks much better! Acked-by: Sam Ravnborg <sam@xxxxxxxxxxxx> -- To unsubscribe from this list: send the line "unsubscribe sparclinux" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
