compiler-rt/test/cfi/cross-dso/util/cfi_stubs.h

   1 // This is a hack to access CFI interface that Android has in libdl.so on
   2 // device, but not in the NDK.
   3 #include <dlfcn.h>
   4 #include <stdint.h>
   5 #include <stdlib.h>
   6
   7 typedef void (*cfi_slowpath_ty)(uint64_t, void *);
   8 typedef void (*cfi_slowpath_diag_ty)(uint64_t, void *, void *);
   9
  10 static cfi_slowpath_ty cfi_slowpath;
  11 static cfi_slowpath_diag_ty cfi_slowpath_diag;
  12
  13 __attribute__((constructor(0), no_sanitize("cfi"))) static void init() {
  14   cfi_slowpath = (cfi_slowpath_ty)dlsym(RTLD_NEXT, "__cfi_slowpath");
  15   cfi_slowpath_diag =
  16       (cfi_slowpath_diag_ty)dlsym(RTLD_NEXT, "__cfi_slowpath_diag");
  17   if (!cfi_slowpath || !cfi_slowpath_diag) abort();
  18 }
  19
  20 extern "C" {
  21 __attribute__((visibility("hidden"), no_sanitize("cfi"))) void __cfi_slowpath(
  22     uint64_t Type, void *Addr) {
  23   cfi_slowpath(Type, Addr);
  24 }
  25
  26 __attribute__((visibility("hidden"), no_sanitize("cfi"))) void
  27 __cfi_slowpath_diag(uint64_t Type, void *Addr, void *Diag) {
  28   cfi_slowpath_diag(Type, Addr, Diag);
  29 }
  30 }