2 years ago, ARM folks support HWASAN[1] in GCC[2], and introduced several target hooks(Many thanks to their work) so other backends can do similar things if they have similar feature. Intel LAM(linear Address Masking)[3 Charpter 14] supports similar feature with the upper bits of pointers can be used as metadata, LAM support two modes: LAM_U48:bits 48-62 can be used as metadata LAM_U57:bits 57-62 can be used as metedata.
These 2 patches mainly support those target hooks, but HWASAN is not really enabled until the final decision for the LAM kernel interface which may take quite a long time. We have verified our patches with a "fake" interface locally[4], and decided to push the backend patches to the GCC13 to make other HWASAN developper's work easy. [1] https://clang.llvm.org/docs/HardwareAssistedAddressSanitizerDesign.html [2] https://gcc.gnu.org/pipermail/gcc-patches/2020-November/557857.html [3] https://www.intel.com/content/dam/develop/external/us/en/documents/architecture-instruction-set-extensions-programming-reference.pdf [4] https://gitlab.com/x86-gcc/gcc/-/tree/users/intel/lam/master Bootstrapped and regtested on x86_64-pc-linux-gnu{-m32,}. Ok for trunk? liuhongt (2): Implement hwasan target_hook. Enable hwasan for x86-64. gcc/config/i386/i386-expand.cc | 12 ++++ gcc/config/i386/i386-options.cc | 3 + gcc/config/i386/i386-opts.h | 6 ++ gcc/config/i386/i386-protos.h | 2 + gcc/config/i386/i386.cc | 123 ++++++++++++++++++++++++++++++++ gcc/config/i386/i386.opt | 16 +++++ libsanitizer/configure.tgt | 1 + 7 files changed, 163 insertions(+) -- 2.18.1
