[PATCH] D148573: Port -fsanitize=function to AArch64

[Fangrui Song via Phabricator via cfe-commits]

MaskRay created this revision.
MaskRay added reviewers: dmgreen, lenary, pcc, peter.smith.
Herald added subscribers: Enna1, hiraditya, kristof.beyls, emaste.
Herald added a project: All.
MaskRay requested review of this revision.
Herald added projects: clang, Sanitizers, LLVM.
Herald added subscribers: llvm-commits, Sanitizers, cfe-commits.

-fsanitize=function instrumented functions have two words preceding at the
function label: a signature and an indirect RTTI object.
The signature also serves as a branch instruction skipping the two words.

With this patch, clang -fsanitize=function correctly instrument aarch64
and aarch64_be target triples.

  _Z3funv:
    .word   335544322                    // signature
    .word   .L__llvm_rtti_proxy-_Z3funv  // indirect RTTI
  
  _Z6callerPFvvE:
    if the first word loaded from the function pointer is not 335544322, skip
    load the second word and dereference the indirect RTTI object, if not the expected typeinfo object, fail


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D148573

Files:
  clang/lib/CodeGen/TargetInfo.cpp
  clang/lib/Driver/ToolChains/FreeBSD.cpp
  clang/lib/Driver/ToolChains/Linux.cpp
  clang/test/CodeGen/ubsan-function.cpp
  clang/test/Driver/fsanitize.c
  compiler-rt/test/ubsan/TestCases/TypeCheck/Function/lit.local.cfg.py
  llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
  llvm/test/CodeGen/AArch64/func-sanitizer.ll

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