/* this struct defines the way the registers are stored on the   stack during a system call. */struct target_pt_regs {    abi_long d1, d2, d3, d4, d5, d6, d7;    abi_long a0, a1, a2, a3, a4, a5, a6;    abi_ulong d0;    abi_ulong usp;    abi_ulong orig_d0;    int16_t stkadj;    uint16_t sr;    abi_ulong pc;    uint16_t fntvex;    uint16_t __fill;};#define UNAME_MACHINE "m68k"void do_m68k_semihosting(CPUState *, int);void do_m68k_simcall(CPUState *, int);