lldb/test/Shell/Register/Inputs/x86-gp-write.cpp

   1 #include <cinttypes>
   2 #include <cstdint>
   3 #include <cstdio>
   4
   5 int main() {
   6   constexpr uint32_t fill = 0x0F0F0F0F;
   7
   8   uint32_t eax, ebx, ecx, edx, esi, edi;
   9   // need to use 64-bit types due to bug in clang
  10   // https://bugs.llvm.org/show_bug.cgi?id=41748
  11   uint64_t esp, ebp;
  12
  13   asm volatile(
  14     // save esp & ebp
  15     "movd    %%esp, %%mm0\n\t"
  16     "movd    %%ebp, %%mm1\n\t"
  17     "\n\t"
  18     "movl    %8, %%eax\n\t"
  19     "movl    %8, %%ebx\n\t"
  20     "movl    %8, %%ecx\n\t"
  21     "movl    %8, %%edx\n\t"
  22     "movl    %8, %%esp\n\t"
  23     "movl    %8, %%ebp\n\t"
  24     "movl    %8, %%esi\n\t"
  25     "movl    %8, %%edi\n\t"
  26     "\n\t"
  27     "int3\n\t"
  28     "\n\t"
  29     // copy new values of esp & ebp
  30     "movd    %%esp, %4\n\t"
  31     "movd    %%ebp, %5\n\t"
  32     // restore saved esp & ebp
  33     "movd    %%mm0, %%esp\n\t"
  34     "movd    %%mm1, %%ebp\n\t"
  35     : "=a"(eax), "=b"(ebx), "=c"(ecx), "=d"(edx), "=y"(esp), "=y"(ebp),
  36       "=S"(esi), "=D"(edi)
  37     : "i"(fill)
  38     : "%mm0", "%mm1"
  39   );
  40
  41   printf("eax = 0x%08" PRIx32 "\n", eax);
  42   printf("ebx = 0x%08" PRIx32 "\n", ebx);
  43   printf("ecx = 0x%08" PRIx32 "\n", ecx);
  44   printf("edx = 0x%08" PRIx32 "\n", edx);
  45   printf("esp = 0x%08" PRIx32 "\n", static_cast<uint32_t>(esp));
  46   printf("ebp = 0x%08" PRIx32 "\n", static_cast<uint32_t>(ebp));
  47   printf("esi = 0x%08" PRIx32 "\n", esi);
  48   printf("edi = 0x%08" PRIx32 "\n", edi);
  49
  50   return 0;
  51 }