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 Newer versions of MESS basically do the same thing (they use a newer version of this library).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 | /* ======================================================================== */ |
| philpem@0 | 2 | /* ========================= LICENSING & COPYRIGHT ======================== */ |
| philpem@0 | 3 | /* ======================================================================== */ |
| philpem@0 | 4 | /* |
| philpem@0 | 5 | * MUSASHI |
| philpem@0 | 6 | * Version 3.3 |
| philpem@0 | 7 | * |
| philpem@0 | 8 | * A portable Motorola M680x0 processor emulation engine. |
| philpem@0 | 9 | * Copyright 1998-2001 Karl Stenerud. All rights reserved. |
| philpem@0 | 10 | * |
| philpem@0 | 11 | * This code may be freely used for non-commercial purposes as long as this |
| philpem@0 | 12 | * copyright notice remains unaltered in the source code and any binary files |
| philpem@0 | 13 | * containing this code in compiled form. |
| philpem@0 | 14 | * |
| philpem@0 | 15 | * All other lisencing terms must be negotiated with the author |
| philpem@0 | 16 | * (Karl Stenerud). |
| philpem@0 | 17 | * |
| philpem@0 | 18 | * The latest version of this code can be obtained at: |
| philpem@0 | 19 | * http://kstenerud.cjb.net |
| philpem@0 | 20 | */ |
| philpem@0 | 21 | |
| philpem@0 | 22 | |
| philpem@0 | 23 | |
| philpem@0 | 24 | #ifndef M68KCONF__HEADER |
| philpem@0 | 25 | #define M68KCONF__HEADER |
| philpem@0 | 26 | |
| philpem@0 | 27 | |
| philpem@0 | 28 | /* Configuration switches. |
| philpem@0 | 29 | * Use OPT_SPECIFY_HANDLER for configuration options that allow callbacks. |
| philpem@0 | 30 | * OPT_SPECIFY_HANDLER causes the core to link directly to the function |
| philpem@0 | 31 | * or macro you specify, rather than using callback functions whose pointer |
| philpem@0 | 32 | * must be passed in using m68k_set_xxx_callback(). |
| philpem@0 | 33 | */ |
| philpem@0 | 34 | #define OPT_OFF 0 |
| philpem@0 | 35 | #define OPT_ON 1 |
| philpem@0 | 36 | #define OPT_SPECIFY_HANDLER 2 |
| philpem@0 | 37 | |
| philpem@0 | 38 | |
| philpem@0 | 39 | /* ======================================================================== */ |
| philpem@0 | 40 | /* ============================== MAME STUFF ============================== */ |
| philpem@0 | 41 | /* ======================================================================== */ |
| philpem@0 | 42 | |
| philpem@0 | 43 | /* If you're compiling this for MAME, only change M68K_COMPILE_FOR_MAME |
| philpem@0 | 44 | * to OPT_ON and use m68kmame.h to configure the 68k core. |
| philpem@0 | 45 | */ |
| philpem@0 | 46 | #ifndef M68K_COMPILE_FOR_MAME |
| philpem@0 | 47 | #define M68K_COMPILE_FOR_MAME OPT_OFF |
| philpem@0 | 48 | #endif /* M68K_COMPILE_FOR_MAME */ |
| philpem@0 | 49 | |
| philpem@0 | 50 | #if M68K_COMPILE_FOR_MAME == OPT_ON |
| philpem@0 | 51 | #include "m68kmame.h" |
| philpem@0 | 52 | #else |
| philpem@0 | 53 | |
| philpem@0 | 54 | |
| philpem@0 | 55 | |
| philpem@0 | 56 | /* ======================================================================== */ |
| philpem@0 | 57 | /* ============================= CONFIGURATION ============================ */ |
| philpem@0 | 58 | /* ======================================================================== */ |
| philpem@0 | 59 | |
| philpem@0 | 60 | /* Turn on if you want to use the following M68K variants */ |
| philpem@0 | 61 | #define M68K_EMULATE_010 OPT_ON |
| philpem@0 | 62 | #define M68K_EMULATE_EC020 OPT_ON |
| philpem@0 | 63 | #define M68K_EMULATE_020 OPT_ON |
| philpem@0 | 64 | |
| philpem@0 | 65 | |
| philpem@0 | 66 | /* If on, the CPU will call m68k_read_immediate_xx() for immediate addressing |
| philpem@0 | 67 | * and m68k_read_pcrelative_xx() for PC-relative addressing. |
| philpem@0 | 68 | * If off, all read requests from the CPU will be redirected to m68k_read_xx() |
| philpem@0 | 69 | */ |
| philpem@0 | 70 | #define M68K_SEPARATE_READS OPT_OFF |
| philpem@0 | 71 | |
| philpem@0 | 72 | |
| philpem@0 | 73 | /* If on, CPU will call the interrupt acknowledge callback when it services an |
| philpem@0 | 74 | * interrupt. |
| philpem@0 | 75 | * If off, all interrupts will be autovectored and all interrupt requests will |
| philpem@0 | 76 | * auto-clear when the interrupt is serviced. |
| philpem@0 | 77 | */ |
| philpem@0 | 78 | #define M68K_EMULATE_INT_ACK OPT_OFF |
| philpem@0 | 79 | #define M68K_INT_ACK_CALLBACK(A) your_int_ack_handler_function(A) |
| philpem@0 | 80 | |
| philpem@0 | 81 | |
| philpem@0 | 82 | /* If on, CPU will call the breakpoint acknowledge callback when it encounters |
| philpem@0 | 83 | * a breakpoint instruction and it is running a 68010+. |
| philpem@0 | 84 | */ |
| philpem@0 | 85 | #define M68K_EMULATE_BKPT_ACK OPT_OFF |
| philpem@0 | 86 | #define M68K_BKPT_ACK_CALLBACK() your_bkpt_ack_handler_function() |
| philpem@0 | 87 | |
| philpem@0 | 88 | |
| philpem@0 | 89 | /* If on, the CPU will monitor the trace flags and take trace exceptions |
| philpem@0 | 90 | */ |
| philpem@0 | 91 | #define M68K_EMULATE_TRACE OPT_OFF |
| philpem@0 | 92 | |
| philpem@0 | 93 | |
| philpem@0 | 94 | /* If on, CPU will call the output reset callback when it encounters a reset |
| philpem@0 | 95 | * instruction. |
| philpem@0 | 96 | */ |
| philpem@0 | 97 | #define M68K_EMULATE_RESET OPT_OFF |
| philpem@0 | 98 | #define M68K_RESET_CALLBACK() your_reset_handler_function() |
| philpem@0 | 99 | |
| philpem@0 | 100 | |
| philpem@0 | 101 | /* If on, CPU will call the set fc callback on every memory access to |
| philpem@0 | 102 | * differentiate between user/supervisor, program/data access like a real |
| philpem@0 | 103 | * 68000 would. This should be enabled and the callback should be set if you |
| philpem@0 | 104 | * want to properly emulate the m68010 or higher. (moves uses function codes |
| philpem@0 | 105 | * to read/write data from different address spaces) |
| philpem@0 | 106 | */ |
| philpem@0 | 107 | #define M68K_EMULATE_FC OPT_OFF |
| philpem@0 | 108 | #define M68K_SET_FC_CALLBACK(A) your_set_fc_handler_function(A) |
| philpem@0 | 109 | |
| philpem@0 | 110 | |
| philpem@0 | 111 | /* If on, CPU will call the pc changed callback when it changes the PC by a |
| philpem@0 | 112 | * large value. This allows host programs to be nicer when it comes to |
| philpem@0 | 113 | * fetching immediate data and instructions on a banked memory system. |
| philpem@0 | 114 | */ |
| philpem@0 | 115 | #define M68K_MONITOR_PC OPT_OFF |
| philpem@0 | 116 | #define M68K_SET_PC_CALLBACK(A) your_pc_changed_handler_function(A) |
| philpem@0 | 117 | |
| philpem@0 | 118 | |
| philpem@0 | 119 | /* If on, CPU will call the instruction hook callback before every |
| philpem@0 | 120 | * instruction. |
| philpem@0 | 121 | */ |
| philpem@0 | 122 | #define M68K_INSTRUCTION_HOOK OPT_OFF |
| philpem@0 | 123 | #define M68K_INSTRUCTION_CALLBACK() your_instruction_hook_function() |
| philpem@0 | 124 | |
| philpem@0 | 125 | |
| philpem@0 | 126 | /* If on, the CPU will emulate the 4-byte prefetch queue of a real 68000 */ |
| philpem@0 | 127 | #define M68K_EMULATE_PREFETCH OPT_OFF |
| philpem@0 | 128 | |
| philpem@0 | 129 | |
| philpem@0 | 130 | /* If on, the CPU will generate address error exceptions if it tries to |
| philpem@0 | 131 | * access a word or longword at an odd address. |
| philpem@0 | 132 | * NOTE: Do not enable this! It is not working! |
| philpem@0 | 133 | */ |
| philpem@0 | 134 | #define M68K_EMULATE_ADDRESS_ERROR OPT_OFF |
| philpem@0 | 135 | |
| philpem@0 | 136 | |
| philpem@0 | 137 | /* Turn on to enable logging of illegal instruction calls. |
| philpem@0 | 138 | * M68K_LOG_FILEHANDLE must be #defined to a stdio file stream. |
| philpem@0 | 139 | * Turn on M68K_LOG_1010_1111 to log all 1010 and 1111 calls. |
| philpem@0 | 140 | */ |
| philpem@0 | 141 | #define M68K_LOG_ENABLE OPT_OFF |
| philpem@0 | 142 | #define M68K_LOG_1010_1111 OPT_OFF |
| philpem@0 | 143 | #define M68K_LOG_FILEHANDLE some_file_handle |
| philpem@0 | 144 | |
| philpem@0 | 145 | |
| philpem@0 | 146 | /* ----------------------------- COMPATIBILITY ---------------------------- */ |
| philpem@0 | 147 | |
| philpem@0 | 148 | /* The following options set optimizations that violate the current ANSI |
| philpem@0 | 149 | * standard, but will be compliant under the forthcoming C9X standard. |
| philpem@0 | 150 | */ |
| philpem@0 | 151 | |
| philpem@0 | 152 | |
| philpem@0 | 153 | /* If on, the enulation core will use 64-bit integers to speed up some |
| philpem@0 | 154 | * operations. |
| philpem@0 | 155 | */ |
| philpem@0 | 156 | #define M68K_USE_64_BIT OPT_OFF |
| philpem@0 | 157 | |
| philpem@0 | 158 | |
| philpem@0 | 159 | /* Set to your compiler's static inline keyword to enable it, or |
| philpem@0 | 160 | * set it to blank to disable it. |
| philpem@0 | 161 | * If you define INLINE in the makefile, it will override this value. |
| philpem@0 | 162 | * NOTE: not enabling inline functions will SEVERELY slow down emulation. |
| philpem@0 | 163 | */ |
| philpem@0 | 164 | #ifndef INLINE |
| philpem@0 | 165 | #define INLINE static __inline__ |
| philpem@0 | 166 | #endif /* INLINE */ |
| philpem@0 | 167 | |
| philpem@0 | 168 | |
| philpem@0 | 169 | /* If your environment requires special prefixes for system callback functions |
| philpem@0 | 170 | * such as the argument to qsort(), then set them here or in the makefile. |
| philpem@0 | 171 | */ |
| philpem@0 | 172 | #ifndef DECL_SPEC |
| philpem@0 | 173 | #define DECL_SPEC |
| philpem@0 | 174 | #endif |
| philpem@0 | 175 | |
| philpem@0 | 176 | #endif /* M68K_COMPILE_FOR_MAME */ |
| philpem@0 | 177 | |
| philpem@0 | 178 | |
| philpem@0 | 179 | /* ======================================================================== */ |
| philpem@0 | 180 | /* ============================== END OF FILE ============================= */ |
| philpem@0 | 181 | /* ======================================================================== */ |
| philpem@0 | 182 | |
| philpem@0 | 183 | #endif /* M68KCONF__HEADER */ |