On Thu, Mar 22, 2018 at 3:45 PM, Bae, Chang Seok <chang.seok....@intel.com> wrote: > On 3/21/18, 18:41, "Andy Lutomirski" <l...@kernel.org> wrote: >> mov to gs changes GSBASE even if GS was unchanged. > In GDB, ptrace (syscall) doesn't happen when FS/GS unchanged as > its (context) cache seems to be first checked. This does not allow to > preserve GSBASE as you know. > >> But it's not clear to me that you've identified any case where >> emulating this behavior is useful. > One argument I heard is (if debugging a legacy application) user > might want to (indirectly) access LDT during inferior call and this > mov to fs/gs has been useful (maybe needed). > >
But your patch doesn't actually do this, since gdb will just do SETREGS anyway, right?
