mirror of https://gitlab.com/camelot/kickc.git
234 lines
4.3 KiB
NASM
234 lines
4.3 KiB
NASM
// Tests that signed indexed subtract works as intended
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// Commodore 64 PRG executable file
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.file [name="signed-indexed-subtract.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 = 4
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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 j = 8
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ldy #0
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__b1:
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// sub(i, $80)
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tya
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ldx #$80
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jsr sub
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// sub(i, $40)
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tya
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ldx #$40
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jsr sub
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// sub(i, $40)
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tya
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ldx #$40
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jsr sub
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// for(byte i: 0..8)
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iny
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cpy #9
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bne __b1
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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 #<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 j
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__b3:
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// print_sint(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 print_sint.w
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lda words+1,y
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sta.z print_sint.w+1
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jsr print_sint
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// print_ln()
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jsr print_ln
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// for(byte j: 0..8)
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inc.z j
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lda #9
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cmp.z j
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bne __b9
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// }
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rts
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__b9:
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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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jmp __b3
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}
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// void sub(__register(A) char idx, __register(X) char s)
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sub: {
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// words[idx] -= s
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asl
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stx.z $ff
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tax
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lda words,x
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sec
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sbc.z $ff
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sta words,x
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bcs !+
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dec words+1,x
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!:
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// }
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rts
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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 signed int as HEX
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// void print_sint(__zp(6) int w)
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print_sint: {
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.label w = 6
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// if(w<0)
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lda.z w+1
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bmi __b1
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// print_char(' ')
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lda #' '
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jsr print_char
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__b2:
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// print_uint((unsigned int)w)
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jsr print_uint
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// }
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rts
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__b1:
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// print_char('-')
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lda #'-'
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jsr print_char
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// w = -w
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lda #0
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sec
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sbc.z w
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sta.z w
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lda #0
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sbc.z w+1
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sta.z w+1
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jmp __b2
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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
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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 = 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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// 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(6) unsigned int w)
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print_uint: {
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.label w = 6
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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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.segment Data
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print_hextab: .text "0123456789abcdef"
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words: .word -$6000, -$600, -$60, -6, 0, 6, $60, $600, $6000
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