2 ; ca65 Macro-Pack for Self Modifying Code (SMC)
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4 ; (c) Christian Krüger, latest change: 17-Jul-2016
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6 ; This software is provided 'as-is', without any expressed or implied
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7 ; warranty. In no event will the authors be held liable for any damages
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8 ; arising from the use of this software.
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10 ; Permission is granted to anyone to use this software for any purpose,
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11 ; including commercial applications, and to alter it and redistribute it
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12 ; freely, subject to the following restrictions:
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14 ; 1. The origin of this software must not be misrepresented; you must not
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15 ; claim that you wrote the original software. If you use this software
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16 ; in a product, an acknowledgment in the product documentation would be
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17 ; appreciated but is not required.
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18 ; 2. Altered source versions must be plainly marked as such, and must not
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19 ; be misrepresented as being the original software.
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20 ; 3. This notice may not be removed or altered from any source
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24 .define _SMCDesignator .mid(0, .tcount(label) - 1, label) .ident(.concat(.string(.right(1, label)), "_SMC"))
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25 .define _SMCAlias .mid(0, .tcount(alias) - 1, alias) .ident(.concat(.string(.right(1, alias)), "_SMC"))
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26 .define SMC_AbsAdr $FADE
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27 .define SMC_ZpAdr $00
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28 .define SMC_Opcode nop
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29 .define SMC_Value $42
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31 .macro SMC_OperateOnValue opcode, label
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32 opcode _SMCDesignator+1
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35 .macro SMC_OperateOnLowByte opcode, label
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36 SMC_OperateOnValue opcode, label
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39 .macro SMC_OperateOnHighByte opcode, label
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40 opcode _SMCDesignator + 2
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43 .macro SMC_Import alias
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47 .macro SMC_Export alias, label
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48 .export _SMCAlias := _SMCDesignator
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51 .macro SMC label, statement
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52 _SMCDesignator: statement
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55 .macro SMC_TransferOpcode label, opcode, register
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56 .if .paramcount = 2 .or .match ({register}, a) .or .match ({register}, )
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59 .elseif .match ({register}, x)
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62 .elseif .match ({register}, y)
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66 .error "Invalid usage of macro 'SMC_TransferOpcode'"
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70 .macro SMC_LoadOpcode label, register
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71 .if .paramcount = 1 .or .match ({register}, a) .or .match ({register}, )
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73 .elseif .match ({register}, x)
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75 .elseif .match ({register}, y)
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78 .error "Invalid usage of macro 'SMC_LoadOpcode'"
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82 .macro SMC_StoreOpcode label, register
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83 .if .paramcount = 1 .or .match ({register}, a) .or .match ({register}, )
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85 .elseif .match ({register}, x)
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87 .elseif .match ({register}, y)
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90 .error "Invalid usage of macro 'SMC_StoreOpcode'"
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94 .macro SMC_ChangeBranch label, destination, register
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95 .if .paramcount = 2 .or .match ({register}, a) .or .match ({register}, )
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96 lda #(<(destination - _SMCDesignator -2))
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97 sta _SMCDesignator+1
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98 .elseif .match ({register}, x)
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99 ldx #(<(destination - _SMCDesignator - 2))
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100 stx _SMCDesignator+1
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101 .elseif .match ({register}, y)
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102 ldy #(<(destination - _SMCDesignator - 2))
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103 sty _SMCDesignator+1
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105 .error "Invalid usage of macro 'SMC_ChangeBranch'"
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109 .macro SMC_TransferValue label, value, register
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110 .if .paramcount = 2 .or .match ({register}, a) .or .match ({register}, )
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112 sta _SMCDesignator+1
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113 .elseif .match ({register}, x)
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115 stx _SMCDesignator+1
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116 .elseif .match ({register}, y)
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118 sty _SMCDesignator+1
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120 .error "Invalid usage of macro 'SMC_TransferValue'"
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124 .macro SMC_LoadValue label, register
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125 .if .paramcount = 1 .or .match ({register}, a) .or .match ({register}, )
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126 lda _SMCDesignator+1
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127 .elseif .match ({register}, x)
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128 ldx _SMCDesignator+1
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129 .elseif .match ({register}, y)
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130 ldy _SMCDesignator+1
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132 .error "Invalid usage of macro 'SMC_LoadValue'"
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136 .macro SMC_StoreValue label, register
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137 .if .paramcount = 1 .or .match ({register}, a) .or .match ({register}, )
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138 sta _SMCDesignator+1
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139 .elseif .match ({register}, x)
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140 stx _SMCDesignator+1
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141 .elseif .match ({register}, y)
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142 sty _SMCDesignator+1
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144 .error "Invalid usage of macro 'SMC_StoreValue'"
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149 .macro SMC_TransferLowByte label, value, register
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150 SMC_TransferValue label, value, register
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153 .macro SMC_LoadLowByte label, register
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154 SMC_LoadValue label, register
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157 .macro SMC_StoreLowByte label, register
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158 SMC_StoreValue label, register
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161 .macro SMC_TransferHighByte label, value, register
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162 .if .paramcount = 2 .or .match ({register}, a) .or .match ({register}, )
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164 sta _SMCDesignator+2
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165 .elseif .match ({register}, x)
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167 stx _SMCDesignator+2
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168 .elseif .match ({register}, y)
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170 sty _SMCDesignator+2
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172 .error "Invalid usage of macro 'SMC_TransferHighByte'"
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176 .macro SMC_LoadHighByte label, register
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177 .if .paramcount = 1 .or .match ({register}, a) .or .match ({register}, )
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178 lda _SMCDesignator+2
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179 .elseif .match ({register}, x)
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180 ldx _SMCDesignator+2
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181 .elseif .match ({register}, y)
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182 ldy _SMCDesignator+2
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184 .error "Invalid usage of macro 'SMC_LoadHighByte'"
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188 .macro SMC_StoreHighByte label, register
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189 .if .paramcount = 1 .or .match ({register}, a) .or .match ({register}, )
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190 sta _SMCDesignator+2
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191 .elseif .match ({register}, x)
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192 stx _SMCDesignator+2
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193 .elseif .match ({register}, y)
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194 sty _SMCDesignator+2
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196 .error "Invalid usage of macro 'SMC_StoreHighByte'"
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200 .macro SMC_TransferAddressSingle label, address, register
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201 .if .paramcount = 2 .or .match ((register), a) .or .match ({register}, )
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202 .if (.match (.left (1, {address}), #))
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204 lda #<(.right (.tcount ({address})-1, {address}))
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205 sta _SMCDesignator+1
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206 lda #>(.right (.tcount ({address})-1, {address}))
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207 sta _SMCDesignator+2
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209 ; assume absolute or zero page
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211 sta _SMCDesignator+1
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213 sta _SMCDesignator+2
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215 .elseif .match ((register), x)
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216 .if (.match (.left (1, {address}), #))
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218 ldx #<(.right (.tcount ({address})-1, {address}))
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219 stx _SMCDesignator+1
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220 ldx #>(.right (.tcount ({address})-1, {address}))
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221 stx _SMCDesignator+2
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223 ; assume absolute or zero page
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225 stx _SMCDesignator+1
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227 stx _SMCDesignator+2
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229 .elseif .match ((register), y)
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230 .if (.match (.left (1, {address}), #))
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232 ldy #<(.right (.tcount ({address})-1, {address}))
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233 sty _SMCDesignator+1
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234 ldy #>(.right (.tcount ({address})-1, {address}))
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235 sty _SMCDesignator+2
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237 ; assume absolute or zero page
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239 sty _SMCDesignator+1
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241 sty _SMCDesignator+2
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244 .error "Invalid usage of macro 'SMC_TransferAddressSingle'"
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248 .macro SMC_TransferAddress label, address
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249 .if (.match (.left (1, {address}), #))
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251 lda #<(.right (.tcount ({address})-1, {address}))
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252 sta _SMCDesignator+1
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253 ldx #>(.right (.tcount ({address})-1, {address}))
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254 stx _SMCDesignator+2
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256 ; assume absolute or zero page
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258 sta _SMCDesignator+1
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260 stx _SMCDesignator)+2
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264 .macro SMC_StoreAddress label
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265 sta _SMCDesignator+1
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266 stx _SMCDesignator+2
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