mirror of
https://github.com/a2stuff/prodos-drivers.git
synced 2024-12-22 05:29:54 +00:00
124 lines
3.4 KiB
C++
124 lines
3.4 KiB
C++
;;; ============================================================
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;;; Generic Macros
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;;; ============================================================
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.define _is_immediate(arg) (.match (.mid (0, 1, {arg}), #))
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.define _is_register(arg) (.match ({arg}, x) .or .match ({arg}, y))
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.define _is_y_register(arg) (.match ({arg}, y))
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.define _immediate_value(arg) (.right (.tcount ({arg})-1, {arg}))
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.macro _op_lo op, arg
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.if _is_immediate {arg}
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op #<_immediate_value {arg}
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.else
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op arg
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.endif
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.endmacro
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.macro _op_hi op, arg
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.if _is_immediate {arg}
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op #>_immediate_value {arg}
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.else
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op arg+1
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.endif
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.endmacro
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;;; ============================================================
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;;; Temporary org change, for relocated routines
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__pushorg_depth__ .set 0
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.macro pushorg addr
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::__pushorg_depth__ .set ::__pushorg_depth__ + 1
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.ident(.sprintf("__pushorg_saved__%d", ::__pushorg_depth__)) := *
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.org addr
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.ident(.sprintf("__pushorg_start__%d", ::__pushorg_depth__)) := *
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.endmacro
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.macro poporg
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.org .ident(.sprintf("__pushorg_saved__%d", ::__pushorg_depth__)) + (* - .ident(.sprintf("__pushorg_start__%d", ::__pushorg_depth__)))
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::__pushorg_depth__ .set ::__pushorg_depth__ - 1
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.endmacro
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;;; ============================================================
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;;; Length-prefixed string
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;;;
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;;; Can include control chars by using:
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;;;
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;;; PASCAL_STRING {"abc",$0D,"def"}
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.macro PASCAL_STRING str,res
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.local data
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.local end
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.byte end - data
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data: .byte str
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end:
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.if .paramcount > 1
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.res res - (end - data), 0
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.endif
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.endmacro
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;;; ============================================================
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;;; Common patterns
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.macro copy arg1, arg2, arg3, arg4
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.if _is_register {arg2} && _is_register {arg4}
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;; indexed load/indexed store
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lda arg1,arg2
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sta arg3,arg4
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.elseif _is_register {arg2}
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;; indexed load variant (arg2 is x or y)
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lda arg1,arg2
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sta arg3
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.elseif _is_register {arg3}
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;; indexed store variant (arg3 is x or y)
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lda arg1
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sta arg2,arg3
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.else
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lda arg1
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sta arg2
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.endif
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.endmacro
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;;; Copy 16-bit value
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;;; copy16 #$1111, $2222 ; immediate, absolute
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;;; copy16 $1111, $2222 ; absolute, absolute
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;;; copy16 $1111,x, $2222 ; indirect load, absolute store
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;;; copy16 $1111, $2222,x ; absolute load, indirect store
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;;; copy16 $1111,x $2222,x ; indirect load, indirect store
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;;; copy16 #$1111, $2222,x ; immediate load, indirect store
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.macro copy16 arg1, arg2, arg3, arg4
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.if _is_register {arg2} && _is_register {arg4}
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;; indexed load/indexed store
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lda arg1,arg2
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sta arg3,arg4
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lda arg1+1,arg2
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sta arg3+1,arg4
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.elseif _is_register {arg2}
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;; indexed load variant (arg2 is x or y)
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lda arg1,arg2
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sta arg3
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lda arg1+1,arg2
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sta arg3+1
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.elseif _is_register {arg3}
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;; indexed store variant (arg3 is x or y)
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_op_lo lda, {arg1}
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sta arg2,arg3
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_op_hi lda, {arg1}
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sta arg2+1,arg3
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.else
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_op_lo lda, {arg1}
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sta arg2
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_op_hi lda, {arg1}
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sta arg2+1
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.endif
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.endmacro
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;;; ============================================================
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;;; Set the high bit on the passed byte
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.define HI(c) ((c)|$80)
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