4 * Cyclone 68000 configuration file
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9 * If this option is enabled, Microsoft ARMASM compatible output is generated
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10 * (output file - Cyclone.asm). Otherwise GNU as syntax is used (Cyclone.s).
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12 #define USE_MS_SYNTAX 0
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15 * Enable this option if you are going to use Cyclone to emulate Genesis /
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16 * Mega Drive system. As VDP chip in these systems had control of the bus,
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17 * several instructions were acting differently, for example TAS did'n have
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18 * the write-back phase. That will be emulated, if this option is enabled.
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20 #define CYCLONE_FOR_GENESIS 0
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23 * This option compresses Cyclone's jumptable. Because of this the executable
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24 * will be smaller and load slightly faster and less relocations will be needed.
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25 * This also fixes the crash problem with 0xfffe and 0xffff opcodes.
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26 * Warning: if you enable this, you MUST call CycloneInit() before calling
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27 * CycloneRun(), or else it will crash.
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29 #define COMPRESS_JUMPTABLE 1
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32 * Address mask for memory hadlers. The bits set will be masked out of address
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33 * parameter, which is passed to r/w memory handlers.
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34 * Using 0xff000000 means that only 24 least significant bits should be used.
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35 * Set to 0 if you want to mask unused address bits in the memory handlers yourself.
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37 #define MEMHANDLERS_ADDR_MASK 0
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40 * Cyclone keeps the 4 least significant bits of SR, PC+membase and it's cycle
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41 * counter in ARM registers instead of the context for performance reasons. If you for
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42 * any reason need to access them in your memory handlers, enable the options below,
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43 * otherwise disable them to improve performance.
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45 * MEMHANDLERS_NEED_PC updates .pc context field with PC value effective at the time
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46 * when memhandler was called (opcode address + 2-10 bytes).
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47 * MEMHANDLERS_NEED_PREV_PC updates .prev_pc context field to currently executed
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48 * opcode address + 2.
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49 * Note that .pc and .prev_pc values are always real pointers to memory, so you must
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50 * subtract .membase to get M68k PC value.
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52 * Warning: updating PC in memhandlers is dangerous, as Cyclone may internally
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53 * increment the PC before fetching the next instruction and continue executing
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54 * at wrong location. It's better to wait until Cyclone CycloneRun() finishes.
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56 * Warning: if you enable MEMHANDLERS_CHANGE_CYCLES, you must also enable
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57 * MEMHANDLERS_NEED_CYCLES, or else Cyclone will keep reloading the same cycle
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58 * count and this will screw timing (if not cause a deadlock).
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60 #define MEMHANDLERS_NEED_PC 0
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61 #define MEMHANDLERS_NEED_PREV_PC 0
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62 #define MEMHANDLERS_NEED_FLAGS 0
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63 #define MEMHANDLERS_NEED_CYCLES 0
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64 #define MEMHANDLERS_CHANGE_PC 0
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65 #define MEMHANDLERS_CHANGE_FLAGS 0
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66 #define MEMHANDLERS_CHANGE_CYCLES 0
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69 * If the following macro is defined, Cyclone no longer calls read*, write*,
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70 * fetch* and checkpc from it's context, it calls these functions directly
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71 * instead, prefixed with prefix selected below. For example, if
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72 * MEMHANDLERS_DIRECT_PREFIX is set to cyclone_, it will call cyclone_read8
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74 * This is to avoid indirect jumps, which are slower. It also saves one ARM
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77 /* MEMHANDLERS_DIRECT_PREFIX "cyclone_" */
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80 * If enabled, Cyclone will call .IrqCallback routine from it's context whenever it
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81 * acknowledges an IRQ. IRQ level (.irq) is not cleared automatically, do this in your
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82 * handler if needed.
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83 * This function must either return vector number to use for interrupt exception,
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84 * CYCLONE_INT_ACK_AUTOVECTOR to use autovector (this is the most common case), or
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85 * CYCLONE_INT_ACK_SPURIOUS (least common case).
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86 * If disabled, it simply uses appropriate autovector, clears the IRQ level and
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87 * continues execution.
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89 #define USE_INT_ACK_CALLBACK 0
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92 * Enable this if you need old PC, flags or cycles;
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93 * or you change cycles in your IrqCallback function.
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95 #define INT_ACK_NEEDS_STUFF 0
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96 #define INT_ACK_CHANGES_CYCLES 0
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99 * If enabled, .ResetCallback is called from the context, whenever RESET opcode is
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100 * encountered. All context members are valid and can be changed.
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101 * If disabled, RESET opcode acts as an NOP.
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103 #define USE_RESET_CALLBACK 0
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106 * If enabled, UnrecognizedCallback is called if an invalid opcode is
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107 * encountered. All context members are valid and can be changed. The handler
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108 * should return zero if you want Cyclone to gererate "Illegal Instruction"
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109 * exception after this, or nonzero if not. In the later case you should change
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110 * the PC by yourself, or else Cyclone will keep executing that opcode all over
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112 * If disabled, "Illegal Instruction" exception is generated and execution is
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115 #define USE_UNRECOGNIZED_CALLBACK 0
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118 * This option will also call UnrecognizedCallback for a-line and f-line
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119 * (0xa*** and 0xf***) opcodes the same way as described above, only appropriate
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120 * exceptions will be generated.
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122 #define USE_AFLINE_CALLBACK 0
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125 * This makes Cyclone to call checkpc from it's context whenever it changes the PC
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126 * by a large value. It takes and should return the PC value in PC+membase form.
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127 * The flags and cycle counter are not valid in this function.
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129 #define USE_CHECKPC_CALLBACK 1
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132 * This determines if checkpc() should be called after jumps when 8 and 16 bit
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133 * displacement values were used.
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135 #define USE_CHECKPC_OFFSETBITS_16 1
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136 #define USE_CHECKPC_OFFSETBITS_8 0
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139 * Call checkpc() after DBcc jumps (which use 16bit displacement). Cyclone prior to
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140 * 0.0087 never did that.
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142 #define USE_CHECKPC_DBRA 0
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145 * When this option is enabled Cyclone will do two word writes instead of one
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146 * long write when handling MOVE.L or MOVEM.L with pre-decrementing destination,
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147 * as described in Bart Trzynadlowski's doc (http://www.trzy.org/files/68knotes.txt).
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148 * Enable this if you are emulating a 16 bit system.
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150 #define SPLIT_MOVEL_PD 1
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153 * Enable emulation of trace mode. Shouldn't cause any performance decrease, so it
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154 * should be safe to keep this ON.
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156 #define EMULATE_TRACE 1
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159 * If enabled, address error exception will be generated if 68k code jumps to an
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160 * odd address. Causes very small performance hit (2 ARM instructions for every
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161 * emulated jump/return/exception in normal case).
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162 * Note: checkpc() must not clear least significant bit of rebased address
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163 * for this to work, as checks are performed after calling checkpc().
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165 #define EMULATE_ADDRESS_ERRORS_JUMP 1
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168 * If enabled, address error exception will be generated if 68k code tries to
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169 * access a word or longword at an odd address. The performance cost is also 2 ARM
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170 * instructions per access (for address error checks).
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172 #define EMULATE_ADDRESS_ERRORS_IO 0
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175 * If an address error happens during another address error processing,
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176 * the processor halts until it is reset (catastrophic system failure, as the manual
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177 * states). This option enables halt emulation.
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178 * Note that this might be not desired if it is known that emulated system should
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179 * never reach this state.
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181 #define EMULATE_HALT 0
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