On 10/17/2017 09:10 AM, Brian Gerst wrote: > On Mon, Oct 16, 2017 at 2:18 PM, Boris Ostrovsky > <boris.ostrov...@oracle.com> wrote: >> >> Replacing the macro with >> >> #define PV_INDIRECT(addr) *addr // well, it's not so much >> indirect anymore >> >> makes things work. Or maybe it can be adjusted top be kept truly indirect. > That is still an indirect call, just using absolute addressing for the > pointer instead of RIP-relative.
Oh, right, I've got my terminology all wrong. -boris > Alternatives has very limited > relocation capabilities. It will only handle a single call or jmp > replacement. Using absolute addressing is slightly less efficient > (takes one extra byte to encode, and needs a relocation for KASLR), > but it works just as well. You could also relocate the instruction > manually by adding the delta between the original and replacement code > to the displacement. _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org https://lists.xen.org/xen-devel
