On 10/12/2017 03:21 PM, Tsimbalist, Igor V wrote: > Enable building libitm with Intel CET options. > > libitm/ > * Makefile.in: Regenerate. > * acinclude.m4: Add enable.m4 and cet.m4. > * config/x86/sjlj.S > (_ITM_beginTransaction): Save Shadow Stack pointer. > (GTM_longjmp): Restore Shadow Stack pointer. > * config/x86/target.h (struct gtm_jmpbuf): > Add Shadow Stack pointer. > * configure: Regenerate. > * configure.ac: Set CET_FLAGS. Update XCFLAGS, libtool_VERSION. > * testsuite/Makefile.in: Regenerate. > > * config/cet.m4: Define ENABLE_CET_COMPATIBILITY. Set > enable_cet_compatibility. > Would it make sense to avoid having different sizes of gtm_jmpbuf by simply having the ssp slot always defined, even if we're not using it?
Along the same lines, would it make sense to have that field at the end of the structure so that the amount of conditional code in in sjlj.S is minimized (ie, all the offests are the same, so in the CET case you just have a single extra store). Jeff
