mirror of https://gitlab.com/camelot/kickc.git
312 lines
6.3 KiB
NASM
312 lines
6.3 KiB
NASM
/// @file
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/// A lightweight library for printing on the C64.
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///
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/// Printing with this library is done by calling print_ function for each element
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// Commodore 64 PRG executable file
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.file [name="test-lowhigh.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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.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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.label print_char_cursor_1 = 6
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.label print_line_cursor_1 = 4
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.segment Code
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main: {
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.label __3 = 8
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.label __6 = 2
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.label __28 = 8
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.label __29 = 2
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.label dw2 = $a
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.label dw = $e
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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_char_cursor_1
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lda #>print_screen
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sta.z print_char_cursor_1+1
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lda #<print_screen
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sta.z print_line_cursor_1
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lda #>print_screen
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sta.z print_line_cursor_1+1
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lda #<$12345678
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sta.z dw
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lda #>$12345678
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sta.z dw+1
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lda #<$12345678>>$10
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sta.z dw+2
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lda #>$12345678>>$10
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sta.z dw+3
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__b1:
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// for( dword dw = $12345678; dw != $12345690; dw++ )
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lda.z dw+3
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cmp #>$12345690>>$10
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bne __b2
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lda.z dw+2
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cmp #<$12345690>>$10
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bne __b2
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lda.z dw+1
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cmp #>$12345690
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bne __b2
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lda.z dw
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cmp #<$12345690
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bne __b2
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// }
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rts
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__b2:
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// WORD1(dw)
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lda.z dw+2
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sta.z __3
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lda.z dw+3
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sta.z __3+1
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// WORD1(dw2) = WORD1(dw) + $1111
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lda.z __28
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clc
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adc #<$1111
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sta.z __28
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lda.z __28+1
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adc #>$1111
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sta.z __28+1
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lda.z dw
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sta.z dw2
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lda.z dw+1
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sta.z dw2+1
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lda.z __28
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sta.z dw2+2
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lda.z __28+1
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sta.z dw2+3
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// WORD0(dw)
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lda.z dw
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sta.z __6
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lda.z dw+1
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sta.z __6+1
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// WORD0(dw2) = WORD0(dw) + $1111
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lda.z __29
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clc
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adc #<$1111
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sta.z __29
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lda.z __29+1
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adc #>$1111
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sta.z __29+1
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lda.z __29
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sta.z dw2
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lda.z __29+1
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sta.z dw2+1
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// print_ulong(dw2)
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// Test set/get low word of dword
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jsr print_ulong
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// print_char(' ')
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lda #' '
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jsr print_char
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// print_uint(WORD1(dw2))
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lda.z dw2+2
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sta.z print_uint.w
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lda.z dw2+3
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sta.z print_uint.w+1
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jsr print_uint
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// print_char(' ')
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// Test get high word of dword
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lda #' '
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jsr print_char
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// print_uint(WORD0(dw2))
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lda.z dw2
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sta.z print_uint.w
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lda.z dw2+1
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sta.z print_uint.w+1
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jsr print_uint
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// print_char(' ')
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// Test get low word of dword
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lda #' '
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jsr print_char
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// print_uchar(BYTE3(dw2))
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ldx.z dw2+3
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jsr print_uchar
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// print_char(' ')
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// Test get high high byte of dword
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lda #' '
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jsr print_char
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// print_uchar(BYTE2(dw2))
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ldx.z dw2+2
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jsr print_uchar
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// print_char(' ')
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// Test get low high byte of dword
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lda #' '
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jsr print_char
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// print_uchar(BYTE1(dw2))
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ldx.z dw2+1
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jsr print_uchar
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// print_char(' ')
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// Test get high low byte of dword
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lda #' '
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jsr print_char
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// print_uchar(BYTE0(dw2))
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ldx.z dw2
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jsr print_uchar
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// print_ln()
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// Test get low low byte of dword
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jsr print_ln
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// for( dword dw = $12345678; dw != $12345690; dw++ )
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inc.z dw
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bne !+
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inc.z dw+1
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bne !+
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inc.z dw+2
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bne !+
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inc.z dw+3
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!:
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lda.z print_line_cursor
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sta.z print_line_cursor_1
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lda.z print_line_cursor+1
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sta.z print_line_cursor_1+1
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jmp __b1
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}
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// Clear the screen. Also resets current line/char cursor.
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print_cls: {
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// memset(print_screen, ' ', 1000)
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jsr memset
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// }
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rts
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}
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// Print a unsigned long as HEX
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// void print_ulong(__zp($a) unsigned long dw)
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print_ulong: {
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.label dw = $a
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// print_uint(WORD1(dw))
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lda.z dw+2
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sta.z print_uint.w
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lda.z dw+3
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sta.z print_uint.w+1
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lda.z print_char_cursor_1
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sta.z print_char_cursor
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lda.z print_char_cursor_1+1
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sta.z print_char_cursor+1
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// print_uint(WORD1(dw))
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jsr print_uint
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// print_uint(WORD0(dw))
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lda.z dw
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sta.z print_uint.w
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lda.z dw+1
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sta.z print_uint.w+1
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jsr print_uint
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// }
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rts
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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 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 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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// 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_1
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sta.z print_line_cursor
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lda #0
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adc.z print_line_cursor_1+1
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sta.z print_line_cursor+1
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// while (print_line_cursor<print_char_cursor)
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cmp.z print_char_cursor+1
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bcc __b2
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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 __b2
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!:
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// }
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rts
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__b2:
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lda.z print_line_cursor
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sta.z print_line_cursor_1
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lda.z print_line_cursor+1
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sta.z print_line_cursor_1+1
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jmp __b1
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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 = 6
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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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.segment Data
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print_hextab: .text "0123456789abcdef"
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