compiler-rt/test/asan/TestCases/zero_page_pc.cpp

// Check that ASan correctly detects SEGV on the zero page.
// RUN: %clangxx_asan %s -o %t && not %run %t 2>&1 | FileCheck %s

#if __has_feature(ptrauth_calls)
#  include <ptrauth.h>
#endif

typedef void void_f();
int main() {
  void_f *func = (void_f *)0x4;
#if __has_feature(ptrauth_calls)
  func = ptrauth_sign_unauthenticated(
      func, ptrauth_key_function_pointer, 0);
#endif
  func();
  // x86 reports the SEGV with both address=4 and pc=4.
  // On PowerPC64 ELFv1, the pointer is taken to be a function-descriptor
  // pointer out of which three 64-bit quantities are read. This will SEGV, but
  // the compiler is free to choose the order. As a result, the address is
  // either 0x4, 0xc or 0x14. The pc is still in main() because it has not
  // actually made the call when the faulting access occurs.
  // CHECK: {{AddressSanitizer: (SEGV|access-violation).*(address|pc) 0x0*[4c]}}
  return 0;
}