当心寄存器

20_day/hello.nas

@@ -1,12 +1,14 @@
+[INSTRSET "i486p"]
 [BITS 32]
-		MOV		AL,'h'
-		INT  0x40
-		MOV		AL,'e'
-		INT  0x40
-		MOV		AL,'l'
-		INT  0x40
-		MOV		AL,'l'
-		INT  0x40
-		MOV		AL,'o'
-		INT  0x40
-		RETF
+		MOV		ECX,msg
+putloop:
+		MOV		AL,[CS:ECX]
+		CMP		AL,0
+		JE		fin
+		INT		0x40
+		ADD		ECX,1
+		JMP		putloop
+fin:
+	RETF
+msg:
+		DB		"hello",0

20_day/naskfunc.nas

@@ -219,10 +219,12 @@ _farcall:		; void farcall(int eip, int cs);
 
 _asm_cons_putchar:
 		STI
+		PUSHAD
 		PUSH		1
 		AND			EAX,0xff ; 将AH和EAX的高位置0，将EAX置为已存入字符编码的状态
 		PUSH    EAX
 		PUSH		DWORD [0x0fec] ; 读取内存并PUSH该值
 		CALL		_cons_putchar
 		ADD			ESP,12   ; 将栈中的数据丢弃
+		POPAD
 		IRETD