mirror of
https://github.com/cc65/cc65.git
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250 lines
7.9 KiB
PHP
250 lines
7.9 KiB
PHP
; smc.mac
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; ca65 Macro-Pack for Self Modifying Code (SMC)
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;
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; (c) Christian Krüger, latest change: 09-Nov-2011
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;
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; This software is provided 'as-is', without any expressed or implied
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; warranty. In no event will the authors be held liable for any damages
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; arising from the use of this software.
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;
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; Permission is granted to anyone to use this software for any purpose,
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; including commercial applications, and to alter it and redistribute it
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; freely, subject to the following restrictions:
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;
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; 1. The origin of this software must not be misrepresented; you must not
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; claim that you wrote the original software. If you use this software
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; in a product, an acknowledgment in the product documentation would be
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; appreciated but is not required.
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; 2. Altered source versions must be plainly marked as such, and must not
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; be misrepresented as being the original software.
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; 3. This notice may not be removed or altered from any source
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; distribution.
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;
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.define _SMCDesignator .mid(0, .tcount(label) - 1, label) .ident(.concat(.string(.right(1, label)), "_SMC"))
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.define _SMCAlias .mid(0, .tcount(alias) - 1, alias) .ident(.concat(.string(.right(1, alias)), "_SMC"))
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.define SMC_AbsAdr $FADE
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.define SMC_ZpAdr $00
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.define SMC_Opcode nop
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.define SMC_Value $42
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.macro SMC_OperateOnValue opcode, label
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opcode _SMCDesignator+1
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.endmacro
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.macro SMC_OperateOnLowByte opcode, label
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SMC_OperateOnValue opcode, label
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.endmacro
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.macro SMC_OperateOnHighByte opcode, label
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opcode _SMCDesignator + 2
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.endmacro
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.macro SMC_Import alias
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.import _SMCAlias
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.endmacro
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.macro SMC_Export alias, label
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.export _SMCAlias := _SMCDesignator
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.endmacro
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.macro SMC label, statement
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_SMCDesignator: statement
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.endmacro
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.macro SMC_TransferOpcode label, opcode, register
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.if .paramcount = 2 .or .match ({register}, a)
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lda #opcode
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sta _SMCDesignator
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.elseif .match ({register}, x)
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ldx #opcode
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stx _SMCDesignator
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.elseif .match ({register}, y)
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ldy #opcode
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sty _SMCDesignator
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.endif
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.endmacro
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.macro SMC_LoadOpcode label, register
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.if .paramcount = 1 .or .match ({register}, a)
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lda _SMCDesignator
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.elseif .match ({register}, x)
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ldx _SMCDesignator
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.elseif .match ({register}, y)
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ldy _SMCDesignator
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.endif
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.endmacro
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.macro SMC_StoreOpcode label, register
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.if .paramcount = 1 .or .match ({register}, a)
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sta _SMCDesignator
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.elseif .match ({register}, x)
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stx _SMCDesignator
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.elseif .match ({register}, y)
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sty _SMCDesignator
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.endif
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.endmacro
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.macro SMC_ChangeBranch label, destination, register
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.if .paramcount = 2 .or .match ({register}, a)
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lda #(destination - _SMCDesignator -2)
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sta _SMCDesignator+1
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.elseif .match ({register}, x)
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ldx #(destination - _SMCDesignator - 2)
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stx _SMCDesignator+1
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.elseif .match ({register}, y)
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ldy #(destination - _SMCDesignator - 2)
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sty _SMCDesignator+1
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.endif
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.endmacro
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.macro SMC_TransferValue label, value, register
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.if .paramcount = 2 .or .match ({register}, a)
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lda value
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sta _SMCDesignator+1
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.elseif .match ({register}, x)
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ldx value
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stx _SMCDesignator+1
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.elseif .match ({register}, y)
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ldy value
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sty _SMCDesignator+1
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.endif
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.endmacro
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.macro SMC_LoadValue label, register
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.if .paramcount = 1 .or .match ({register}, a)
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lda _SMCDesignator+1
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.elseif .match ({register}, x)
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ldx _SMCDesignator+1
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.elseif .match ({register}, y)
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ldy _SMCDesignator+1
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.endif
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.endmacro
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.macro SMC_StoreValue label, register
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.if .paramcount = 1 .or .match ({register}, a)
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sta _SMCDesignator+1
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.elseif .match ({register}, x)
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stx _SMCDesignator+1
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.elseif .match ({register}, y)
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sty _SMCDesignator+1
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.endif
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.endmacro
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.macro SMC_TransferLowByte label, value, register
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SMC_TransferValue label, value, register
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.endmacro
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.macro SMC_LoadLowByte label, register
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SMC_LoadValue label, register
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.endmacro
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.macro SMC_StoreLowByte label, register
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SMC_StoreValue label, register
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.endmacro
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.macro SMC_TransferHighByte label, value, register
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.if .paramcount = 2 .or .match ({register}, a)
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lda value
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sta _SMCDesignator+2
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.elseif .match ({register}, x)
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ldx value
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stx _SMCDesignator+2
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.elseif .match ({register}, y)
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ldy value
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sty _SMCDesignator+2
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.endif
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.endmacro
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.macro SMC_LoadHighByte label, register
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.if .paramcount = 1 .or .match ({register}, a)
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lda _SMCDesignator+2
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.elseif .match ({register}, x)
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ldx _SMCDesignator+2
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.elseif .match ({register}, y)
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ldy _SMCDesignator+2
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.endif
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.endmacro
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.macro SMC_StoreHighByte label, register
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.if .paramcount = 1 .or .match ({register}, a)
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sta _SMCDesignator+2
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.elseif .match ({register}, x)
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stx _SMCDesignator+2
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.elseif .match ({register}, y)
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sty _SMCDesignator+2
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.endif
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.endmacro
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.macro SMC_TransferAddressSingle label, address, register
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.if .paramcount = 2 .or .match ((register), a)
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.if (.match (.left (1, {address}), #))
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; immediate mode
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lda #<(.right (.tcount ({address})-1, {address}))
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sta _SMCDesignator+1
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lda #>(.right (.tcount ({address})-1, {address}))
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sta _SMCDesignator+2
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.else
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; assume absolute or zero page
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lda address
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sta _SMCDesignator+1
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lda 1+(address)
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sta _SMCDesignator+2
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.endif
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.elseif .match ((register), x)
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.if (.match (.left (1, {address}), #))
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; immediate mode
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ldx #<(.right (.tcount ({address})-1, {address}))
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stx _SMCDesignator+1
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ldx #>(.right (.tcount ({address})-1, {address}))
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stx _SMCDesignator+2
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.else
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; assume absolute or zero page
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ldx address
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stx _SMCDesignator+1
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ldx 1+(address)
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stx _SMCDesignator+2
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.endif
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.elseif .match ((register), y)
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.if (.match (.left (1, {address}), #))
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; immediate mode
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ldy #<(.right (.tcount ({address})-1, {address}))
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sty _SMCDesignator+1
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ldy #>(.right (.tcount ({address})-1, {address}))
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sty _SMCDesignator+2
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.else
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; assume absolute or zero page
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ldy address
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sty _SMCDesignator+1
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ldy 1+(address)
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sty _SMCDesignator+2
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.endif
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.endif
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.endmacro
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.macro SMC_TransferAddress label, address
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.if (.match (.left (1, {address}), #))
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; immediate mode
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lda #<(.right (.tcount ({address})-1, {address}))
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sta _SMCDesignator+1
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ldx #>(.right (.tcount ({address})-1, {address}))
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stx _SMCDesignator+2
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.else
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; assume absolute or zero page
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lda {address}
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sta _SMCDesignator+1
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ldx 1+{address}
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stx _SMCDesignator)+2
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.endif
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.endmacro
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.macro SMC_StoreAddress label
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sta _SMCDesignator+1
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stx _SMCDesignator+2
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.endmacro
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