📄 eg0417.lst
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Microsoft (R) Macro Assembler Version 6.15.8803 08/18/07 22:29:48
eg0417.asm Page 1 - 1
;eg0417.asm
include io32.inc
C .nolist
C .list
C
00000000 .data
= 0000000A count = 10
00000000 0000000A [ array dword count dup(0)
00000000
]
00000028 00000000 temp dword ?
0000002C 0000001E [ readbuf db 30 dup(0)
00
]
00000000 .code
00000000 start:
00000000 B9 0000000A mov ecx,count
00000005 BB 00000000 R mov ebx,offset array
0000000A E8 00000014 again: call read ; 调用子程序，输入一个数据
0000000F A1 00000028 R mov eax,temp ; 获得出口参数
00000014 89 03 mov [ebx],eax ; 存放到数据缓冲区
00000016 83 C3 04 add ebx,4
00000019 49 dec ecx
0000001A 75 EE jnz again
exit 0
00000023 read proc ; 输入有符号十进制数的子程序
00000023 50 push eax ; 出口参数：变量TEMP＝补码表示的二进制数值
00000024 53 push ebx ; 说明：负数用"－"引导
00000025 51 push ecx
00000026 52 push edx
00000027 B8 0000002C R read0: mov eax,offset readbuf
0000002C E8 00000000 E call readmsg ; 输入一个字符串
00000031 85 C0 test eax,eax
00000033 74 40 jz readerr ; 没有输入数据，转向错误处理
00000035 83 F8 0C cmp eax,12
00000038 77 3B ja readerr ; 输入超过12个字符，转向错误处理
0000003A BA 0000002C R mov edx,offset readbuf ; EDX指向输入缓冲区
0000003F 33 DB xor ebx,ebx ; EBX保存结果
00000041 33 C9 xor ecx,ecx ; ECX为正负标志，0为正，－1为负
00000043 8A 02 mov al,[edx] ; 取一个字符
00000045 3C 2B cmp al,'+' ; 是"＋"，继续
00000047 74 09 jz read1
00000049 3C 2D cmp al,'-' ; 是"－"，设置－1标志
0000004B 75 0C jnz read2
0000004D B9 FFFFFFFF mov ecx,-1
00000052 42 read1: inc edx ; 取下一个字符
00000053 8A 02 mov al,[edx]
00000055 84 C0 test al,al ; 是结尾0，转向求补码
00000057 74 28 jz read3
00000059 3C 30 read2: cmp al,'0' ; 不是0～9之间的数码，则输入错误
0000005B 72 18 jb readerr
0000005D 3C 39 cmp al,'9'
0000005F 77 14 ja readerr
00000061 2C 30 sub al,30h ; 是0～9之间的数码，则转换为二进制数
00000063 6B DB 0A imul ebx,10 ; 原数值乘10：EBX＝EBX×10
00000066 72 0D jc readerr ; CF＝1，说明乘积溢出，输入数据超出32位范围，出错
00000068 0F B6 C0 movzx eax,al ; 零位扩展，便于相加
0000006B 03 D8 add ebx,eax ; 原数值乘10后，与新数码相加
0000006D 81 FB 80000000 cmp ebx,80000000h ; 数据超过231，出错
00000073 76 DD jbe read1 ; 继续转换下一个数位
00000075 B8 0000009C R readerr: mov eax,offset errmsg ; 显示出错信息
0000007A E8 00000000 E call dispmsg
0000007F EB A6 jmp read0
;
00000081 85 C9 read3: test ecx,ecx ; 判断是正数还是负数
00000083 74 04 jz read4
00000085 F7 DB neg ebx ; 是负数，进行求补
00000087 EB 08 jmp read5
00000089 81 FB 7FFFFFFF read4: cmp ebx,7fffffffh ; 正数超过231-1，出错
0000008F 77 E4 ja readerr
00000091 89 1D 00000028 R read5: mov temp,ebx ; 设置出口参数
00000097 5A pop edx
00000098 59 pop ecx
00000099 5B pop ebx
0000009A 58 pop eax
0000009B C3 ret ; 子程序返回
0000009C 49 6E 70 75 74 errmsg byte 'Input error, enter again: ',0
20 65 72 72 6F
72 2C 20 65 6E
74 65 72 20 61
67 61 69 6E 3A
20 00
000000B7 read endp
end start
Microsoft (R) Macro Assembler Version 6.15.8803 08/18/07 22:29:48
eg0417.asm Symbols 2 - 1
Macros:
N a m e Type
exit . . . . . . . . . . . . . . Proc
Segments and Groups:
N a m e Size Length Align Combine Class
FLAT . . . . . . . . . . . . . . GROUP
_DATA . . . . . . . . . . . . . 32 Bit 0000004A Para Public 'DATA'
_TEXT . . . . . . . . . . . . . 32 Bit 000000B7 Para Public 'CODE'
Procedures, parameters and locals:
N a m e Type Value Attr
ExitProcess . . . . . . . . . . P Near 00000000 FLAT Length= 00000000 External STDCALL
read . . . . . . . . . . . . . . P Near 00000023 _TEXT Length= 00000094 Public STDCALL
read0 . . . . . . . . . . . . L Near 00000027 _TEXT
read1 . . . . . . . . . . . . L Near 00000052 _TEXT
read2 . . . . . . . . . . . . L Near 00000059 _TEXT
readerr . . . . . . . . . . . L Near 00000075 _TEXT
read3 . . . . . . . . . . . . L Near 00000081 _TEXT
read4 . . . . . . . . . . . . L Near 00000089 _TEXT
read5 . . . . . . . . . . . . L Near 00000091 _TEXT
Symbols:
N a m e Type Value Attr
@CodeSize . . . . . . . . . . . Number 00000000h
@DataSize . . . . . . . . . . . Number 00000000h
@Interface . . . . . . . . . . . Number 00000003h
@Model . . . . . . . . . . . . . Number 00000007h
@code . . . . . . . . . . . . . Text _TEXT
@data . . . . . . . . . . . . . Text FLAT
@fardata? . . . . . . . . . . . Text FLAT
@fardata . . . . . . . . . . . . Text FLAT
@stack . . . . . . . . . . . . . Text FLAT
again . . . . . . . . . . . . . L Near 0000000A _TEXT
array . . . . . . . . . . . . . DWord 00000000 _DATA
count . . . . . . . . . . . . . Number 0000000Ah
dispbb . . . . . . . . . . . . . L Near 00000000 FLAT External STDCALL
dispbd . . . . . . . . . . . . . L Near 00000000 FLAT External STDCALL
dispbw . . . . . . . . . . . . . L Near 00000000 FLAT External STDCALL
dispcrlf . . . . . . . . . . . . L Near 00000000 FLAT External STDCALL
dispc . . . . . . . . . . . . . L Near 00000000 FLAT External STDCALL
disphb . . . . . . . . . . . . . L Near 00000000 FLAT External STDCALL
disphd . . . . . . . . . . . . . L Near 00000000 FLAT External STDCALL
disphw . . . . . . . . . . . . . L Near 00000000 FLAT External STDCALL
dispmsg . . . . . . . . . . . . L Near 00000000 FLAT External STDCALL
disprb . . . . . . . . . . . . . L Near 00000000 FLAT External STDCALL
disprd . . . . . . . . . . . . . L Near 00000000 FLAT External STDCALL
disprf . . . . . . . . . . . . . L Near 00000000 FLAT External STDCALL
disprw . . . . . . . . . . . . . L Near 00000000 FLAT External STDCALL
dispsib . . . . . . . . . . . . L Near 00000000 FLAT External STDCALL
dispsid . . . . . . . . . . . . L Near 00000000 FLAT External STDCALL
dispsiw . . . . . . . . . . . . L Near 00000000 FLAT External STDCALL
dispuib . . . . . . . . . . . . L Near 00000000 FLAT External STDCALL
dispuid . . . . . . . . . . . . L Near 00000000 FLAT External STDCALL
dispuiw . . . . . . . . . . . . L Near 00000000 FLAT External STDCALL
errmsg . . . . . . . . . . . . . Byte 0000009C _TEXT
readbb . . . . . . . . . . . . . L Near 00000000 FLAT External STDCALL
readbd . . . . . . . . . . . . . L Near 00000000 FLAT External STDCALL
readbuf . . . . . . . . . . . . Byte 0000002C _DATA
readbw . . . . . . . . . . . . . L Near 00000000 FLAT External STDCALL
readc . . . . . . . . . . . . . L Near 00000000 FLAT External STDCALL
readhb . . . . . . . . . . . . . L Near 00000000 FLAT External STDCALL
readhd . . . . . . . . . . . . . L Near 00000000 FLAT External STDCALL
readhw . . . . . . . . . . . . . L Near 00000000 FLAT External STDCALL
readmsg . . . . . . . . . . . . L Near 00000000 FLAT External STDCALL
readsib . . . . . . . . . . . . L Near 00000000 FLAT External STDCALL
readsid . . . . . . . . . . . . L Near 00000000 FLAT External STDCALL
readsiw . . . . . . . . . . . . L Near 00000000 FLAT External STDCALL
readuib . . . . . . . . . . . . L Near 00000000 FLAT External STDCALL
readuid . . . . . . . . . . . . L Near 00000000 FLAT External STDCALL
readuiw . . . . . . . . . . . . L Near 00000000 FLAT External STDCALL
start . . . . . . . . . . . . . L Near 00000000 _TEXT Public STDCALL
temp . . . . . . . . . . . . . . DWord 00000028 _DATA
0 Warnings
0 Errors
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