mirror of https://gitlab.com/camelot/kickc.git
446 lines
7.3 KiB
NASM
446 lines
7.3 KiB
NASM
/// @file
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/// Commodore 64 Registers and Constants
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/// @file
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/// The MOS 6526 Complex Interface Adapter (CIA)
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///
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/// http://archive.6502.org/datasheets/mos_6526_cia_recreated.pdf
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// Commodore 64 PRG executable file
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.file [name="test-comparisons-word.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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// empty circle
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.const FF = $57
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// filled circle
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.const TT = $51
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.label print_screen = $400
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.label print_line_cursor = 6
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.label print_char_cursor = 2
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.segment Code
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main: {
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.label w1 = $10
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.label w2 = $b
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.label s = $d
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.label op = $e
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.label j = $f
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.label i = $12
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// print_cls()
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jsr print_cls
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lda #<print_screen
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sta.z print_line_cursor
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lda #>print_screen
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sta.z print_line_cursor+1
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lda #0
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sta.z s
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lda #<print_screen
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sta.z print_char_cursor
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lda #>print_screen
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sta.z print_char_cursor+1
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lda #0
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sta.z i
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__b1:
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// word w1 = words[i]
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lda.z i
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asl
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tay
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lda words,y
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sta.z w1
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lda words+1,y
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sta.z w1+1
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lda #0
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sta.z j
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__b2:
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// word w2 = words[j]
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lda.z j
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asl
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tay
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lda words,y
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sta.z w2
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lda words+1,y
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sta.z w2+1
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lda #0
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sta.z op
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__b3:
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// compare(w1,w2,op)
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lda.z w1
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sta.z compare.w1
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lda.z w1+1
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sta.z compare.w1+1
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lda.z op
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jsr compare
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// if(++s==3)
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inc.z s
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lda #3
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cmp.z s
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bne __b4
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// print_ln()
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jsr print_ln
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lda.z print_line_cursor
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sta.z print_char_cursor
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lda.z print_line_cursor+1
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sta.z print_char_cursor+1
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lda #0
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sta.z s
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__b4:
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// for( byte op: 0..5 )
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inc.z op
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lda #6
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cmp.z op
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bne __b3
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// for( byte j: 0..2)
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inc.z j
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lda #3
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cmp.z j
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bne __b2
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// for( byte i: 0..2)
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inc.z i
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cmp.z i
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bne __b1
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__b5:
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// loop forever
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jmp __b5
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}
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// Clear the screen. Also resets current line/char cursor.
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print_cls: {
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// memset(print_screen, ' ', 1000)
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jsr memset
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// }
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rts
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}
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// Compare two words using an operator
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// void compare(__zp(8) unsigned int w1, __zp($b) unsigned int w2, __register(A) char op)
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compare: {
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.label w1 = 8
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.label w2 = $b
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.label ops = 4
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.label r = $a
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// if(op==0)
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cmp #0
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bne !__b1+
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jmp __b1
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!__b1:
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// if(op==1)
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cmp #1
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bne !__b2+
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jmp __b2
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!__b2:
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// if(op==2)
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cmp #2
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bne !__b3+
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jmp __b3
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!__b3:
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// if(op==3)
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cmp #3
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beq __b4
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// if(op==4)
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cmp #4
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beq __b5
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// if(op==5)
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cmp #5
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bne __b8
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// if(w1!=w2)
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lda.z w1
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cmp.z w2
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bne !+
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lda.z w1+1
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cmp.z w2+1
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beq __b7
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!:
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lda #TT
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sta.z r
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jmp __b19
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__b7:
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lda #FF
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sta.z r
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__b19:
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lda #<ops_1
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sta.z ops
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lda #>ops_1
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sta.z ops+1
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jmp __b6
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__b8:
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lda #FF
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sta.z r
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lda #<0
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sta.z ops
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sta.z ops+1
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__b6:
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// print_uint(w1)
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jsr print_uint
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// print_str(ops)
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jsr print_str
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// print_uint(w2)
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lda.z w2
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sta.z print_uint.w
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lda.z w2+1
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sta.z print_uint.w+1
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jsr print_uint
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// print_char(r)
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lda.z r
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jsr print_char
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// print_char(' ')
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lda #' '
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jsr print_char
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// }
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rts
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__b5:
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// if(w1==w2)
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lda.z w1+1
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cmp.z w2+1
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bne __b9
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lda.z w1
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cmp.z w2
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bne __b9
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lda #TT
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sta.z r
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jmp __b20
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__b9:
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lda #FF
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sta.z r
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__b20:
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lda #<ops_2
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sta.z ops
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lda #>ops_2
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sta.z ops+1
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jmp __b6
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__b4:
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// if(w1>=w2)
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lda.z w1+1
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cmp.z w2+1
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bcc __b10
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bne !+
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lda.z w1
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cmp.z w2
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bcc __b10
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!:
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lda #TT
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sta.z r
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jmp __b21
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__b10:
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lda #FF
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sta.z r
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__b21:
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lda #<ops_3
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sta.z ops
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lda #>ops_3
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sta.z ops+1
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jmp __b6
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__b3:
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// if(w1>w2)
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lda.z w1+1
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cmp.z w2+1
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bne !+
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lda.z w1
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cmp.z w2
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beq __b11
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!:
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bcc __b11
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lda #TT
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sta.z r
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jmp __b22
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__b11:
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lda #FF
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sta.z r
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__b22:
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lda #<ops_4
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sta.z ops
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lda #>ops_4
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sta.z ops+1
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jmp __b6
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__b2:
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// if(w1<=w2)
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lda.z w2+1
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cmp.z w1+1
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bcc __b12
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bne !+
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lda.z w2
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cmp.z w1
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bcc __b12
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!:
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lda #TT
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sta.z r
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jmp __b23
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__b12:
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lda #FF
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sta.z r
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__b23:
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lda #<ops_5
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sta.z ops
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lda #>ops_5
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sta.z ops+1
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jmp __b6
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__b1:
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// if(w1<w2)
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lda.z w2+1
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cmp.z w1+1
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bne !+
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lda.z w2
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cmp.z w1
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beq __b13
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!:
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bcc __b13
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lda #TT
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sta.z r
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jmp __b24
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__b13:
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lda #FF
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sta.z r
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__b24:
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lda #<ops_6
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sta.z ops
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lda #>ops_6
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sta.z ops+1
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jmp __b6
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.segment Data
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ops_1: .text "!="
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.byte 0
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ops_2: .text "=="
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.byte 0
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ops_3: .text ">="
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.byte 0
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ops_4: .text "> "
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.byte 0
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ops_5: .text "<="
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.byte 0
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ops_6: .text "< "
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.byte 0
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}
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.segment Code
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// Print a newline
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print_ln: {
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__b1:
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// print_line_cursor + 0x28
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lda #$28
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clc
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adc.z print_line_cursor
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sta.z print_line_cursor
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bcc !+
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inc.z print_line_cursor+1
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!:
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// while (print_line_cursor<print_char_cursor)
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lda.z print_line_cursor+1
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cmp.z print_char_cursor+1
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bcc __b1
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bne !+
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lda.z print_line_cursor
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cmp.z print_char_cursor
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bcc __b1
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!:
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// }
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rts
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}
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// Copies the character c (an unsigned char) to the first num characters of the object pointed to by the argument str.
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// void * memset(void *str, char c, unsigned int num)
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memset: {
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.const c = ' '
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.const num = $3e8
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.label str = print_screen
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.label end = str+num
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.label dst = 4
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lda #<str
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sta.z dst
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lda #>str
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sta.z dst+1
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__b1:
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// for(char* dst = str; dst!=end; dst++)
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lda.z dst+1
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cmp #>end
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bne __b2
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lda.z dst
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cmp #<end
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bne __b2
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// }
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rts
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__b2:
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// *dst = c
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lda #c
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ldy #0
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sta (dst),y
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// for(char* dst = str; dst!=end; dst++)
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inc.z dst
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bne !+
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inc.z dst+1
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!:
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jmp __b1
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}
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// Print a unsigned int as HEX
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// void print_uint(__zp(8) unsigned int w)
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print_uint: {
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.label w = 8
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// print_uchar(BYTE1(w))
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ldx.z w+1
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jsr print_uchar
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// print_uchar(BYTE0(w))
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ldx.z w
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jsr print_uchar
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// }
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rts
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}
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// Print a zero-terminated string
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// void print_str(__zp(4) char *str)
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print_str: {
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.label str = 4
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__b1:
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// while(*str)
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ldy #0
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lda (str),y
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cmp #0
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bne __b2
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// }
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rts
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__b2:
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// print_char(*(str++))
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ldy #0
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lda (str),y
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jsr print_char
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// print_char(*(str++));
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inc.z str
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bne !+
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inc.z str+1
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!:
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jmp __b1
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}
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// Print a single char
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// void print_char(__register(A) char ch)
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print_char: {
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// *(print_char_cursor++) = ch
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ldy #0
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sta (print_char_cursor),y
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// *(print_char_cursor++) = ch;
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inc.z print_char_cursor
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bne !+
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inc.z print_char_cursor+1
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!:
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// }
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rts
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}
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// Print a char as HEX
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// void print_uchar(__register(X) char b)
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print_uchar: {
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// b>>4
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txa
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lsr
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lsr
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lsr
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lsr
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// print_char(print_hextab[b>>4])
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tay
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lda print_hextab,y
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// Table of hexadecimal digits
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jsr print_char
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// b&0xf
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lda #$f
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axs #0
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// print_char(print_hextab[b&0xf])
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lda print_hextab,x
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jsr print_char
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// }
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rts
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}
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.segment Data
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print_hextab: .text "0123456789abcdef"
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words: .word $12, $3f34, $cfed
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