FPU_ORIG_EIP
unsigned long address = FPU_ORIG_EIP;
unsigned long address = FPU_ORIG_EIP;
FPU_ORIG_EIP = FPU_EIP;
FPU_EIP = FPU_ORIG_EIP; /* Point to current FPU instruction. */
entry_sel_off.offset = FPU_ORIG_EIP;
FPU_ORIG_EIP = FPU_EIP - code_base;
FPU_EIP = FPU_ORIG_EIP;