testing/test-cases/bind-addend.dtest/main.c

   1
   2 // BUILD:  $CC main.c -o $BUILD_DIR/bind-addend.exe -lobjc
   3
   4 // RUN:  ./bind-addend.exe
   5
   6 // Verify that negative addends work with pointers in to the shared cache and pointers to the image itself
   7
   8 #include <stdio.h>
   9
  10 // Note this is weak so that we have a bind
  11 __attribute__((weak))
  12 void* p = 0;
  13
  14 // Choose a large enough negative offset to be before the shared cache or the image
  15 const uintptr_t offset = 1ULL << 36;
  16 void* pMinus = (void*)((uintptr_t)&p - offset);
  17
  18 // Get a pointer to something we assume is in the shared cache
  19 // Note we don't declare a function as arm64e would want to sign this
  20 extern int objc_msgSend;
  21 void* msgSendMinus = (void*)((uintptr_t)&objc_msgSend - offset);
  22
  23 int main()
  24 {
  25     printf("[BEGIN] bind-addend\n");
  26
  27     if ( pMinus != (void*)((uintptr_t)&p - offset) ) {
  28         printf("[FAIL]  bind-addend: %p != %p\n", pMinus, (void*)((uintptr_t)&p - offset));
  29         return 0;
  30     }
  31
  32     if ( msgSendMinus != (void*)((uintptr_t)&objc_msgSend - offset) ) {
  33         printf("[FAIL]  bind-addend: %p != %p\n", msgSendMinus, (void*)((uintptr_t)&objc_msgSend - offset));
  34         return 0;
  35     }
  36
  37     printf("[PASS]  bind-addend\n");
  38     return 0;
  39 }
  40