📄 disboot.asm
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; ==================================================== ;
; .: keenjoy95 2007 :. ;
; .: keenjoy95_at_gmail_dot_com :. ;
; ---------------------------------------------------- ;
; 代码描述 : 引导扇区演示程序反汇编 ;
; 逆向方法 : ;
; ndisasm -o 0x7c00 boot.bin >> disboot.asm ;
; ==================================================== ;
00000000 E92600 jmp 0x29 ; 无条件跳转到程序的入口点
; 跳转的指令是"E9 2600" (地址偏移是0026, 向后跳38D/0x26H个字节)
;------------------------------------------------------;
; * 下面是错误的反汇编 —— 数据段 * ;
;------------------------------------------------------; "Hello, MyOS world!"
00000003 48 dec ax ; "H"
00000004 656C gs insb ; "e" | "l"
00000006 6C insb ; "l"
00000007 6F outsw ; "o"
00000008 2C20 sub al,0x20 ; "," | " "
0000000A 4D dec bp ; "M"
0000000B 794F jns 0x5c ; "y" | "O"
0000000D 53 push bx ; "S"
0000000E 20776F and [bx+0x6f],dh ; " " | "w" | "o"
00000011 726C jc 0x7f ; "r" | "l"
00000013 6421B80300 and [fs:bx+si+0x3],di ; "d" | "!" (注意: 这里混合了指令和数据)
;
; [正确的反汇编如下]
; ------------------
; 00000015 B80300 mov ax,0x3
;------------------------------------------------------;
; * 代 码 段 * ;
;------------------------------------------------------;
; B80300 mov ax,0x3 ; 对于引导程序来说, 这里的寻址是错误的 (正确的寻址为: 0x7c03)
00000018 89C5 mov bp,ax ; ┓
0000001A B91200 mov cx,0x12 ; ┃
0000001D B80113 mov ax,0x1301 ; ┣ 字符串显示子程序
00000020 BB0C00 mov bx,0xc ; ┃
00000023 BA0000 mov dx,0x0 ; ┃
00000026 CD10 int 0x10 ; ┛
00000028 C3 ret ; 子程序无参数返回
00000029 8CC8 mov ax,cs ; ┓
0000002B 8ED8 mov ds,ax ; ┣ 段寄存器初始化
0000002D 8EC0 mov es,ax ; ┛
0000002F E8E3FF call 0x15 ; 跳转的指令是"E8 E3FF" (地址偏移是FFE3, 向前跳29D/0x1DH个字节)
00000032 EBFE jmp short 0x32 ; 主程序进入无限循环
; 跳转的指令是"E8 FE" (地址偏移是00FE, 向前跳2D个字节, 进入死循环)
;------------------------------------------------------;
; * 下面是错误的反汇编 —— 引导区填充段及结束标志 * ;
;------------------------------------------------------;
00000034 0000 add [bx+si],al
00000036 0000 add [bx+si],al
00000038 0000 add [bx+si],al
0000003A 0000 add [bx+si],al
0000003C 0000 add [bx+si],al
0000003E 0000 add [bx+si],al
00000040 0000 add [bx+si],al
00000042 0000 add [bx+si],al
00000044 0000 add [bx+si],al
00000046 0000 add [bx+si],al
00000048 0000 add [bx+si],al
0000004A 0000 add [bx+si],al
0000004C 0000 add [bx+si],al
0000004E 0000 add [bx+si],al
00000050 0000 add [bx+si],al
00000052 0000 add [bx+si],al
00000054 0000 add [bx+si],al
00000056 0000 add [bx+si],al
00000058 0000 add [bx+si],al
0000005A 0000 add [bx+si],al
0000005C 0000 add [bx+si],al
0000005E 0000 add [bx+si],al
00000060 0000 add [bx+si],al
00000062 0000 add [bx+si],al
00000064 0000 add [bx+si],al
00000066 0000 add [bx+si],al
00000068 0000 add [bx+si],al
0000006A 0000 add [bx+si],al
0000006C 0000 add [bx+si],al
0000006E 0000 add [bx+si],al
00000070 0000 add [bx+si],al
00000072 0000 add [bx+si],al
00000074 0000 add [bx+si],al
00000076 0000 add [bx+si],al
00000078 0000 add [bx+si],al
0000007A 0000 add [bx+si],al
0000007C 0000 add [bx+si],al
0000007E 0000 add [bx+si],al
00000080 0000 add [bx+si],al
00000082 0000 add [bx+si],al
00000084 0000 add [bx+si],al
00000086 0000 add [bx+si],al
00000088 0000 add [bx+si],al
0000008A 0000 add [bx+si],al
0000008C 0000 add [bx+si],al
0000008E 0000 add [bx+si],al
00000090 0000 add [bx+si],al
00000092 0000 add [bx+si],al
00000094 0000 add [bx+si],al
00000096 0000 add [bx+si],al
00000098 0000 add [bx+si],al
0000009A 0000 add [bx+si],al
0000009C 0000 add [bx+si],al
0000009E 0000 add [bx+si],al
000000A0 0000 add [bx+si],al
000000A2 0000 add [bx+si],al
000000A4 0000 add [bx+si],al
000000A6 0000 add [bx+si],al
000000A8 0000 add [bx+si],al
000000AA 0000 add [bx+si],al
000000AC 0000 add [bx+si],al
000000AE 0000 add [bx+si],al
000000B0 0000 add [bx+si],al
000000B2 0000 add [bx+si],al
000000B4 0000 add [bx+si],al
000000B6 0000 add [bx+si],al
000000B8 0000 add [bx+si],al
000000BA 0000 add [bx+si],al
000000BC 0000 add [bx+si],al
000000BE 0000 add [bx+si],al
000000C0 0000 add [bx+si],al
000000C2 0000 add [bx+si],al
000000C4 0000 add [bx+si],al
000000C6 0000 add [bx+si],al
000000C8 0000 add [bx+si],al
000000CA 0000 add [bx+si],al
000000CC 0000 add [bx+si],al
000000CE 0000 add [bx+si],al
000000D0 0000 add [bx+si],al
000000D2 0000 add [bx+si],al
000000D4 0000 add [bx+si],al
000000D6 0000 add [bx+si],al
000000D8 0000 add [bx+si],al
000000DA 0000 add [bx+si],al
000000DC 0000 add [bx+si],al
000000DE 0000 add [bx+si],al
000000E0 0000 add [bx+si],al
000000E2 0000 add [bx+si],al
000000E4 0000 add [bx+si],al
000000E6 0000 add [bx+si],al
000000E8 0000 add [bx+si],al
000000EA 0000 add [bx+si],al
000000EC 0000 add [bx+si],al
000000EE 0000 add [bx+si],al
000000F0 0000 add [bx+si],al
000000F2 0000 add [bx+si],al
000000F4 0000 add [bx+si],al
000000F6 0000 add [bx+si],al
000000F8 0000 add [bx+si],al
000000FA 0000 add [bx+si],al
000000FC 0000 add [bx+si],al
000000FE 0000 add [bx+si],al
00000100 0000 add [bx+si],al
00000102 0000 add [bx+si],al
00000104 0000 add [bx+si],al
00000106 0000 add [bx+si],al
00000108 0000 add [bx+si],al
0000010A 0000 add [bx+si],al
0000010C 0000 add [bx+si],al
0000010E 0000 add [bx+si],al
00000110 0000 add [bx+si],al
00000112 0000 add [bx+si],al
00000114 0000 add [bx+si],al
00000116 0000 add [bx+si],al
00000118 0000 add [bx+si],al
0000011A 0000 add [bx+si],al
0000011C 0000 add [bx+si],al
0000011E 0000 add [bx+si],al
00000120 0000 add [bx+si],al
00000122 0000 add [bx+si],al
00000124 0000 add [bx+si],al
00000126 0000 add [bx+si],al
00000128 0000 add [bx+si],al
0000012A 0000 add [bx+si],al
0000012C 0000 add [bx+si],al
0000012E 0000 add [bx+si],al
00000130 0000 add [bx+si],al
00000132 0000 add [bx+si],al
00000134 0000 add [bx+si],al
00000136 0000 add [bx+si],al
00000138 0000 add [bx+si],al
0000013A 0000 add [bx+si],al
0000013C 0000 add [bx+si],al
0000013E 0000 add [bx+si],al
00000140 0000 add [bx+si],al
00000142 0000 add [bx+si],al
00000144 0000 add [bx+si],al
00000146 0000 add [bx+si],al
00000148 0000 add [bx+si],al
0000014A 0000 add [bx+si],al
0000014C 0000 add [bx+si],al
0000014E 0000 add [bx+si],al
00000150 0000 add [bx+si],al
00000152 0000 add [bx+si],al
00000154 0000 add [bx+si],al
00000156 0000 add [bx+si],al
00000158 0000 add [bx+si],al
0000015A 0000 add [bx+si],al
0000015C 0000 add [bx+si],al
0000015E 0000 add [bx+si],al
00000160 0000 add [bx+si],al
00000162 0000 add [bx+si],al
00000164 0000 add [bx+si],al
00000166 0000 add [bx+si],al
00000168 0000 add [bx+si],al
0000016A 0000 add [bx+si],al
0000016C 0000 add [bx+si],al
0000016E 0000 add [bx+si],al
00000170 0000 add [bx+si],al
00000172 0000 add [bx+si],al
00000174 0000 add [bx+si],al
00000176 0000 add [bx+si],al
00000178 0000 add [bx+si],al
0000017A 0000 add [bx+si],al
0000017C 0000 add [bx+si],al
0000017E 0000 add [bx+si],al
00000180 0000 add [bx+si],al
00000182 0000 add [bx+si],al
00000184 0000 add [bx+si],al
00000186 0000 add [bx+si],al
00000188 0000 add [bx+si],al
0000018A 0000 add [bx+si],al
0000018C 0000 add [bx+si],al
0000018E 0000 add [bx+si],al
00000190 0000 add [bx+si],al
00000192 0000 add [bx+si],al
00000194 0000 add [bx+si],al
00000196 0000 add [bx+si],al
00000198 0000 add [bx+si],al
0000019A 0000 add [bx+si],al
0000019C 0000 add [bx+si],al
0000019E 0000 add [bx+si],al
000001A0 0000 add [bx+si],al
000001A2 0000 add [bx+si],al
000001A4 0000 add [bx+si],al
000001A6 0000 add [bx+si],al
000001A8 0000 add [bx+si],al
000001AA 0000 add [bx+si],al
000001AC 0000 add [bx+si],al
000001AE 0000 add [bx+si],al
000001B0 0000 add [bx+si],al
000001B2 0000 add [bx+si],al
000001B4 0000 add [bx+si],al
000001B6 0000 add [bx+si],al
000001B8 0000 add [bx+si],al
000001BA 0000 add [bx+si],al
000001BC 0000 add [bx+si],al
000001BE 0000 add [bx+si],al
000001C0 0000 add [bx+si],al
000001C2 0000 add [bx+si],al
000001C4 0000 add [bx+si],al
000001C6 0000 add [bx+si],al
000001C8 0000 add [bx+si],al
000001CA 0000 add [bx+si],al
000001CC 0000 add [bx+si],al
000001CE 0000 add [bx+si],al
000001D0 0000 add [bx+si],al
000001D2 0000 add [bx+si],al
000001D4 0000 add [bx+si],al
000001D6 0000 add [bx+si],al
000001D8 0000 add [bx+si],al
000001DA 0000 add [bx+si],al
000001DC 0000 add [bx+si],al
000001DE 0000 add [bx+si],al
000001E0 0000 add [bx+si],al
000001E2 0000 add [bx+si],al
000001E4 0000 add [bx+si],al
000001E6 0000 add [bx+si],al
000001E8 0000 add [bx+si],al
000001EA 0000 add [bx+si],al
000001EC 0000 add [bx+si],al
000001EE 0000 add [bx+si],al
000001F0 0000 add [bx+si],al
000001F2 0000 add [bx+si],al
000001F4 0000 add [bx+si],al
000001F6 0000 add [bx+si],al
000001F8 0000 add [bx+si],al
000001FA 0000 add [bx+si],al
000001FC 0000 add [bx+si],al
000001FE 55 push bp ; 引导扇区结束标志位 1
000001FF AA stosb ; 引导扇区结束标志位 2
; ---8<--------------- [Cut Here] --------------->8--- ;
; .: keenjoy95 2007 :. ;
; .: keenjoy95_at_gmail_dot_com :. ;
; ! NO rights reserved ! ;
; ---------------------------------------------------- ;⌨️ 快捷键说明
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