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 #include "test_support.h"
  11
  12 // Note this is weak so that we have a bind
  13 __attribute__((weak))
  14 void* p = 0;
  15
  16 // Choose a large enough negative offset to be before the shared cache or the image
  17 const uintptr_t offset = 1ULL << 36;
  18 void* pMinus = (void*)((uintptr_t)&p - offset);
  19
  20 // Get a pointer to something we assume is in the shared cache
  21 // Note we don't declare a function as arm64e would want to sign this
  22 extern int objc_msgSend;
  23 void* msgSendMinus = (void*)((uintptr_t)&objc_msgSend - offset);
  24
  25 int main(int argc, const char* argv[], const char* envp[], const char* apple[]) {
  26     if ( pMinus != (void*)((uintptr_t)&p - offset) ) {
  27         FAIL("bind-addend: %p != %p", pMinus, (void*)((uintptr_t)&p - offset));
  28     }
  29
  30     if ( msgSendMinus != (void*)((uintptr_t)&objc_msgSend - offset) ) {
  31         FAIL("bind-addend: %p != %p", msgSendMinus, (void*)((uintptr_t)&objc_msgSend - offset));
  32     }
  33
  34     PASS("bind-addend");
  35 }
  36