test_mfmsr_1:
  #_ REGISTER_IN r3 0x0000000000000000
  mfmsr r3
  blr
  #_ REGISTER_OUT r3 0x0000000000009030

test_mfmsr_2:
  #_ REGISTER_IN r4 0xFFFFFFFFFFFFFFFF
  mfmsr r4
  blr
  #_ REGISTER_OUT r4 0x0000000000009030