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

   1 #include <cassert>
   2 #include <cinttypes>
   3 #include <cstdint>
   4 #include <cstdio>
   5
   6 struct alignas(16) float80_raw {
   7   uint8_t data[10];
   8 };
   9
  10 int main() {
  11   float80_raw st[8];
  12   uint16_t env[14];
  13   union alignas(16) {
  14     uint16_t i16[256];
  15     uint32_t i32[128];
  16     uint64_t i64[64];
  17   } fxsave;
  18
  19   asm volatile(
  20     "finit\n\t"
  21     "int3\n\t"
  22 #if defined(__x86_64__)
  23     "fxsave64 %2\n\t"
  24 #else
  25     "fxsave %2\n\t"
  26 #endif
  27     "fnstenv %1\n\t"
  28     "fnclex\n\t"
  29     "fstpt 0x00(%0)\n\t"
  30     "fstpt 0x10(%0)\n\t"
  31     "fstpt 0x20(%0)\n\t"
  32     "fstpt 0x30(%0)\n\t"
  33     "fstpt 0x40(%0)\n\t"
  34     "fstpt 0x50(%0)\n\t"
  35     "fstpt 0x60(%0)\n\t"
  36     "fstpt 0x70(%0)\n\t"
  37     :
  38     : "a"(st), "m"(env), "m"(fxsave)
  39     : "st"
  40   );
  41
  42   assert(env[0] == fxsave.i16[0]);
  43   assert(env[2] == fxsave.i16[1]);
  44
  45   printf("fctrl = 0x%04" PRIx16 "\n", env[0]);
  46   printf("fstat = 0x%04" PRIx16 "\n", env[2]);
  47   printf("ftag = 0x%04" PRIx16 "\n", env[4]);
  48   printf("fop = 0x%04" PRIx16 "\n", fxsave.i16[3]);
  49 #if defined(__x86_64__)
  50   printf("fip = 0x%016" PRIx64 "\n", fxsave.i64[1]);
  51   printf("fdp = 0x%016" PRIx64 "\n", fxsave.i64[2]);
  52 #else
  53   printf("fip = 0x%08" PRIx32 "\n", fxsave.i32[2]);
  54   printf("fcs = 0x%04" PRIx16 "\n", fxsave.i16[6]);
  55   printf("fdp = 0x%08" PRIx32 "\n", fxsave.i32[4]);
  56   printf("fds = 0x%04" PRIx16 "\n", fxsave.i16[10]);
  57 #endif
  58   printf("mxcsr = 0x%08" PRIx32 "\n", fxsave.i32[6]);
  59   printf("mxcsr_mask = 0x%08" PRIx32 "\n", fxsave.i32[7]);
  60
  61   for (int i = 0; i < 8; ++i) {
  62     printf("st%d = { ", i);
  63     for (int j = 0; j < sizeof(st->data); ++j)
  64       printf("0x%02" PRIx8 " ", st[i].data[j]);
  65     printf("}\n");
  66   }
  67
  68   return 0;
  69 }