学 Win32 汇编[19]: 查看二进制等相关函数
在 masm32.inc 中有这样几个函数的声明:
byt2bin_ex PROTO :BYTE, :DWORD wrd2bin_ex PROTO :WORD, :DWORD dw2bin_ex PROTO :DWORD, :DWORD dw2hex_ex PROTO :DWORD, :DWORD bin2byte_ex PROTO :DWORD
byt2bin_ex: 从 Byte 数到二进制字符串
; Test19_1.asm .386 .model flat, stdcall include windows.inc include kernel32.inc include masm32.inc include debug.inc includelib kernel32.lib includelib masm32.lib includelib debug.lib .data szBin db 8 dup(0), 0 ;这是接收二进制字符串的缓冲区 bVal db 3 .code main proc ;查看数字的二进制信息 invoke byt2bin_ex, 2, addr szBin PrintString szBin ;00000010 ;查看变量 bVal 的二进制信息 invoke byt2bin_ex, bVal, addr szBin PrintString szBin ;00000011 ;查看寄存器 al 的二进制信息 mov al, 0feh invoke byt2bin_ex, al, addr szBin PrintString szBin ;11111110 ret main endp end main
wrd2bin_ex: 从 Word 数到二进制字符串
; Test19_2.asm .386 .model flat, stdcall include windows.inc include kernel32.inc include masm32.inc include debug.inc includelib kernel32.lib includelib masm32.lib includelib debug.lib .data szBin db 16 dup(0), 0 ;这是接收二进制字符串的缓冲区 wVal dw 3 .code main proc ;查看数字的二进制信息 invoke wrd2bin_ex, 2, addr szBin PrintString szBin ;0000000000000010 ;查看变量 wVal 的二进制信息 invoke wrd2bin_ex, wVal, addr szBin PrintString szBin ;0000000000000011 ;查看寄存器 ax 的二进制信息 mov ax, 0fffeh invoke wrd2bin_ex, ax, addr szBin PrintString szBin ;1111111111111110 ret main endp end main
dw2bin_ex: 从 DWord 数到二进制字符串
; Test19_3.asm .386 .model flat, stdcall include windows.inc include kernel32.inc include masm32.inc include debug.inc includelib kernel32.lib includelib masm32.lib includelib debug.lib .data szBin db 32 dup(0), 0 ;这是接收二进制字符串的缓冲区 dwVal dd 3 .code main proc ;查看数字的二进制信息 invoke dw2bin_ex, 2, addr szBin PrintString szBin ;00000000000000000000000000000010 ;查看变量 dwVal 的二进制信息 invoke dw2bin_ex, dwVal, addr szBin PrintString szBin ;00000000000000000000000000000011 ;查看寄存器 eax 的二进制信息 mov eax, 0fffffffeh invoke dw2bin_ex, eax, addr szBin PrintString szBin ;11111111111111111111111111111110 ret main endp end main
dw2hex_ex: 从 DWord 数到十六进制字符串
; Test19_4.asm .386 .model flat, stdcall include windows.inc include kernel32.inc include masm32.inc include debug.inc includelib kernel32.lib includelib masm32.lib includelib debug.lib .data szHex db 8 dup(0), 0 ;这是接收十六进制字符串的缓冲区 dwVal dd 255 .code main proc ;查看数字的十六进制信息 invoke dw2hex_ex, 16, addr szHex PrintString szHex ;00000010 ;查看变量 dwVal 的十六进制信息 invoke dw2hex_ex, dwVal, addr szHex PrintString szHex ;000000FF ;查看寄存器 eax 的十六进制信息 mov eax, 2694881440 invoke dw2hex_ex, eax, addr szHex PrintString szHex ;A0A0A0A0 ret main endp end main
bin2byte_ex: 从字符串(必须有 8 个 '0' 或 '1' 组成)到字节
; Test19_5.asm .386 .model flat, stdcall include windows.inc include kernel32.inc include masm32.inc include debug.inc includelib kernel32.lib includelib masm32.lib includelib debug.lib .data szTxt1 db '00000010', 0 szTxt2 db '01111011', 0 szTxt3 db '11111111', 0 .code main proc invoke bin2byte_ex, addr szTxt1 PrintDec eax ;2 invoke bin2byte_ex, addr szTxt2 PrintDec eax ;123 invoke bin2byte_ex, addr szTxt3 PrintDec eax ;255 ret main endp end main
学习查看二进制是为了看到 EFLAGS 中的二进制位的变化:
; Test19_6.asm .386 .model flat, stdcall include windows.inc include kernel32.inc include masm32.inc include debug.inc includelib kernel32.lib includelib masm32.lib includelib debug.lib .data szBin db 8 dup(?), 0 .code main proc lahf ;LAHF 指令是把 EFLAGS 寄存器的低字节读入 AH invoke byt2bin_ex, ah, addr szBin PrintString szBin ;01000110 ret main endp end main
posted on 2010-04-13 12:36 万一 阅读(1856) 评论(0) 编辑 收藏