30dayMakeOS/23_day/a_nask.nas

[FORMAT "WCOFF"]			; 生成对象文件的模式
[INSTRSET "i486p"]		; 表示使用486兼容指令集
[BITS 32]							; 生成32位模式机器语言
[FILE "a_nask.nas"]		; 源文件名信息

		GLOBAL	_api_putchar
		GLOBAL	_api_putstr0
		GLOBAL	_api_end
		GLOBAL	_api_openwin
		GLOBAL	_api_putstrwin
		GLOBAL	_api_boxfilwin
		GLOBAL	_api_initmalloc
		GLOBAL	_api_malloc
		GLOBAL	_api_free
		GLOBAL	_api_point
		GLOBAL	_api_refreshwin
		GLOBAL	_api_linewin
		GLOBAL	_api_closewin
		GLOBAL	_api_getkey

[SECTION .text]

_api_putchar:	; void api_putchar(int c);
		MOV		EDX,1
		MOV		AL,[ESP+4]		; c
		INT		0x40
		RET

_api_putstr0:	; void api_putstr0(char *s);
		PUSH	EBX
		MOV		EDX,2
		MOV		EBX,[ESP+8]		; s
		INT		0x40
		POP		EBX
		RET

_api_end: ; void api_end(void); 
		MOV			EDX,4
		INT			0x40

_api_openwin:	; int api_openwin(char *buf, int xsiz, int ysiz, int col_inv, char *title);
		PUSH	EDI
		PUSH	ESI
		PUSH	EBX
		MOV		EDX,5
		MOV		EBX,[ESP+16]	; buf
		MOV		ESI,[ESP+20]	; xsiz
		MOV		EDI,[ESP+24]	; ysiz
		MOV		EAX,[ESP+28]	; col_inv
		MOV		ECX,[ESP+32]	; title
		INT		0x40
		POP		EBX
		POP		ESI
		POP		EDI
		RET

_api_putstrwin:	; void api_putstrwin(int win, int x, int y, int col, int len, char *str);
		PUSH	EDI
		PUSH	ESI
		PUSH	EBP
		PUSH	EBX
		MOV		EDX,6
		MOV		EBX,[ESP+20]	; win
		MOV		ESI,[ESP+24]	; x
		MOV		EDI,[ESP+28]	; y
		MOV		EAX,[ESP+32]	; col
		MOV		ECX,[ESP+36]	; len
		MOV		EBP,[ESP+40]	; str
		INT		0x40
		POP		EBX
		POP		EBP
		POP		ESI
		POP		EDI
		RET

_api_boxfilwin:	; void api_boxfilwin(int win, int x0, int y0, int x1, int y1, int col);
		PUSH	EDI
		PUSH	ESI
		PUSH	EBP
		PUSH	EBX
		MOV		EDX,7
		MOV		EBX,[ESP+20]	; win
		MOV		EAX,[ESP+24]	; x0
		MOV		ECX,[ESP+28]	; y0
		MOV		ESI,[ESP+32]	; x1
		MOV		EDI,[ESP+36]	; y1
		MOV		EBP,[ESP+40]	; col
		INT		0x40
		POP		EBX
		POP		EBP
		POP		ESI
		POP		EDI
		RET

_api_initmalloc:	; void api_initmalloc(void);
		PUSH	EBX
		MOV		EDX,8
		MOV		EBX,[CS:0x0020]		; malloc内存空间的地址
		MOV		EAX,EBX
		ADD		EAX,32*1024				; 加上32KB
		MOV		ECX,[CS:0x0000]		; 数据段的大小
		SUB		ECX,EAX
		INT		0x40
		POP		EBX
		RET

_api_malloc:		; char *api_malloc(int size);
		PUSH	EBX
		MOV		EDX,9
		MOV		EBX,[CS:0x0020]
		MOV		ECX,[ESP+8]			; size
		INT		0x40
		POP		EBX
		RET

_api_free:			; void api_free(char *addr, int size);
		PUSH	EBX
		MOV		EDX,10
		MOV		EBX,[CS:0x0020]
		MOV		EAX,[ESP+ 8]		; addr
		MOV		ECX,[ESP+12]		; size
		INT		0x40
		POP		EBX
		RET

_api_point:		; void api_point(int win, int x, int y, int col);
		PUSH	EDI
		PUSH	ESI
		PUSH	EBX
		MOV		EDX,11
		MOV		EBX,[ESP+16]	; win
		MOV		ESI,[ESP+20]	; x
		MOV		EDI,[ESP+24]	; y
		MOV		EAX,[ESP+28]	; col
		INT		0x40
		POP		EBX
		POP		ESI
		POP		EDI
		RET

_api_refreshwin:	; void api_refreshwin(int win, int x0, int y0, int x1, int y1);
		PUSH	EDI
		PUSH	ESI
		PUSH	EBX
		MOV		EDX,12
		MOV		EBX,[ESP+16]	; win
		MOV		EAX,[ESP+20]	; x0
		MOV		ECX,[ESP+24]	; y0
		MOV		ESI,[ESP+28]	; x1
		MOV		EDI,[ESP+32]	; y1
		INT		0x40
		POP		EBX
		POP		ESI
		POP		EDI
		RET

_api_linewin:		; void api_linewin(int win, int x0, int y0, int x1, int y1, int col);
		PUSH	EDI
		PUSH	ESI
		PUSH	EBP
		PUSH	EBX
		MOV		EDX,13
		MOV		EBX,[ESP+20]	; win
		MOV		EAX,[ESP+24]	; x0
		MOV		ECX,[ESP+28]	; y0
		MOV		ESI,[ESP+32]	; x1
		MOV		EDI,[ESP+36]	; y1
		MOV		EBP,[ESP+40]	; col
		INT		0x40
		POP		EBX
		POP		EBP
		POP		ESI
		POP		EDI
		RET

_api_closewin:		; void api_closewin(int win);
		PUSH	EBX
		MOV		EDX,14
		MOV		EBX,[ESP+8]	; win
		INT		0x40
		POP		EBX
		RET

_api_getkey:		; int api_getkey(int mode);
		MOV		EDX,15
		MOV		EAX,[ESP+4]	; mode
		INT		0x40
		RET