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103 lines
1.8 KiB
NASM
103 lines
1.8 KiB
NASM
// Test __varcall calling convention
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// Pointer to Struct parameter & return value
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// Commodore 64 PRG executable file
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.file [name="varcall-8.prg", type="prg", segments="Program"]
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.segmentdef Program [segments="Basic, Code, Data"]
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.segmentdef Basic [start=$0801]
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.segmentdef Code [start=$80d]
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.segmentdef Data [startAfter="Code"]
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.segment Basic
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:BasicUpstart(main)
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.const SIZEOF_STRUCT_COLS = 2
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.const OFFSET_STRUCT_COLS_BG = 1
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.label COLS = $d020
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.segment Code
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main: {
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.label a = 6
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.label b = 8
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.label c = $a
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.label m = 2
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// struct Cols a = { 1, 7 }
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ldy #SIZEOF_STRUCT_COLS
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!:
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lda __0-1,y
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sta a-1,y
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dey
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bne !-
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// struct Cols b = { 2, 6 }
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ldy #SIZEOF_STRUCT_COLS
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!:
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lda __1-1,y
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sta b-1,y
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dey
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bne !-
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// struct Cols c = { 3, 5 }
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ldy #SIZEOF_STRUCT_COLS
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!:
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lda __2-1,y
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sta c-1,y
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dey
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bne !-
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// struct Cols *m = min(&a,&b)
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lda #<a
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sta.z min.a
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lda #>a
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sta.z min.a+1
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lda #<b
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sta.z min.b
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lda #>b
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sta.z min.b+1
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jsr min
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// *COLS = *m
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ldx #SIZEOF_STRUCT_COLS
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ldy #0
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!:
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lda (m),y
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sta COLS,y
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iny
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dex
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bne !-
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// min(m,&c)
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lda #<c
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sta.z min.b
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lda #>c
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sta.z min.b+1
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jsr min
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// m = min(m,&c)
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// *COLS = *m
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ldx #SIZEOF_STRUCT_COLS
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ldy #0
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!:
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lda (m),y
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sta COLS,y
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iny
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dex
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bne !-
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// }
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rts
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}
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// __zp(2) struct Cols * min(__zp(2) struct Cols *a, __zp(4) struct Cols *b)
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min: {
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.label a = 2
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.label b = 4
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.label return = 2
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// if(a->bg < b->bg)
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ldy #OFFSET_STRUCT_COLS_BG
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lda (b),y
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cmp (a),y
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bcc __breturn
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// return b;
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lda.z b
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sta.z return
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lda.z b+1
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sta.z return+1
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__breturn:
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// }
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rts
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// return a;
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}
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.segment Data
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__0: .byte 1, 7
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__1: .byte 2, 6
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__2: .byte 3, 5
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