Wed, 16 Apr 2014 02:20:43 -0600
fixed bus error handling for real this time (save registers before every instruction and push the saved registers if a bus error occurs, since the instruction may have changed registers before the bus error, and also stop the instruction immediately with longjmp so it won't change memory after the bus error)
This isn't actually what a real 68k does, but it is a good enough approximation. A real 68k will jump back into the middle of the faulted instruction and resume it from the memory access that faulted as opposed to restarting from the beginning like this CPU emulation does. It would be a lot harder to do that with the way this CPU library is designed. Newer versions of MESS basically do the same thing (they use a newer version of this library).
| philpem@0 | 1 | #ifndef SIM__HEADER |
| philpem@0 | 2 | #define SIM__HEADER |
| philpem@0 | 3 | |
| philpem@0 | 4 | unsigned int m68k_read_memory_8(unsigned int address); |
| philpem@0 | 5 | unsigned int m68k_read_memory_16(unsigned int address); |
| philpem@0 | 6 | unsigned int m68k_read_memory_32(unsigned int address); |
| philpem@0 | 7 | void m68k_write_memory_8(unsigned int address, unsigned int value); |
| philpem@0 | 8 | void m68k_write_memory_16(unsigned int address, unsigned int value); |
| philpem@0 | 9 | void m68k_write_memory_32(unsigned int address, unsigned int value); |
| philpem@0 | 10 | void cpu_pulse_reset(void); |
| philpem@0 | 11 | void cpu_set_fc(unsigned int fc); |
| philpem@0 | 12 | int cpu_irq_ack(int level); |
| philpem@0 | 13 | |
| philpem@0 | 14 | #endif /* SIM__HEADER */ |