[RFC/RFT 0/3] Add compiler support for Control Flow Integrity

[Dan Li <ashimida.1990@gmail.com>]

This series of patches is mainly used to support the control flow
integrity protection of the linux kernel [1], which is similar to
-fsanitize=kcfi in clang 16.0 [2,3].

I hope that this feature will also support user-mode CFI in the
future (at least for developers who can recompile the runtime),
so I use -fsanitize=cfi as a compilation option here.

Any suggestion please let me know :).

Thanks, Dan.

[1] https://lore.kernel.org/all/20220908215504.3686827-1-samitolvanen@google.com/
[2] https://clang.llvm.org/docs/ControlFlowIntegrity.html
[3] https://reviews.llvm.org/D119296

Dan Li (3):
  [PR102768] flag-types.h (enum sanitize_code): Extend sanitize_code to
    64 bits to support more features
  [PR102768] Support CFI: Add new pass for Control Flow Integrity
  [PR102768] aarch64: Add support for Control Flow Integrity

Signed-off-by: Dan Li <ashimida.1990@gmail.com>

---
 gcc/Makefile.in                               |   1 +
 gcc/asan.h                                    |   4 +-
 gcc/c-family/c-attribs.cc                     |  10 +-
 gcc/c-family/c-common.h                       |   2 +-
 gcc/c/c-parser.cc                             |   4 +-
 gcc/cgraphunit.cc                             |  34 +++
 gcc/common.opt                                |   4 +-
 gcc/config/aarch64/aarch64.cc                 | 106 ++++++++
 gcc/cp/typeck.cc                              |   2 +-
 gcc/doc/invoke.texi                           |  35 +++
 gcc/doc/passes.texi                           |  10 +
 gcc/doc/tm.texi                               |  27 +++
 gcc/doc/tm.texi.in                            |   8 +
 gcc/dwarf2asm.cc                              |   2 +-
 gcc/flag-types.h                              |  67 ++---
 gcc/opt-suggestions.cc                        |   2 +-
 gcc/opts.cc                                   |  26 +-
 gcc/opts.h                                    |   8 +-
 gcc/output.h                                  |   3 +
 gcc/passes.def                                |   1 +
 gcc/target.def                                |  39 +++
 .../aarch64/control_flow_integrity_1.c        |  14 ++
 .../aarch64/control_flow_integrity_2.c        |  25 ++
 .../aarch64/control_flow_integrity_3.c        |  23 ++
 gcc/toplev.cc                                 |   4 +
 gcc/tree-cfg.cc                               |   2 +-
 gcc/tree-cfi.cc                               | 229 ++++++++++++++++++
 gcc/tree-pass.h                               |   1 +
 gcc/tree.cc                                   | 144 +++++++++++
 gcc/tree.h                                    |   1 +
 gcc/varasm.cc                                 |  29 +++
 31 files changed, 803 insertions(+), 64 deletions(-)
 create mode 100644 gcc/testsuite/gcc.target/aarch64/control_flow_integrity_1.c
 create mode 100644 gcc/testsuite/gcc.target/aarch64/control_flow_integrity_2.c
 create mode 100644 gcc/testsuite/gcc.target/aarch64/control_flow_integrity_3.c
 create mode 100644 gcc/tree-cfi.cc

-- 
2.17.1