📄 eg0419s.lst
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Microsoft (R) Macro Assembler Version 6.15.8803 08/19/07 15:14:34
eg0419s.asm Page 1 - 1
;eg0419s.asm（子程序文件）
include io32.inc
C .nolist
C .list
C
public read, write, mean ; 子程序共用
extern temp:dword ; 外部变量
00000000 .data
00000000 0000000C [ writebuf byte 12 dup(0) ; 显示缓冲区
00
]
0000000C 0000001E [ readbuf byte 30 dup(0)
00
]
00000000 .code
00000000 write proc c ; 显示有符号十进制数的子程序，EAX＝入口参数
00000000 53 push ebx ; 保护寄存器
00000001 51 push ecx
00000002 52 push edx
00000003 B9 0000000B mov ecx,sizeof writebuf-1 ; 显示缓冲区清0
00000008 C6 81 00000000 R write0: mov writebuf[ecx],0
00
0000000F 83 E9 01 sub ecx,1
00000012 73 F4 jnc write0
00000014 BB 00000000 R mov ebx,offset writebuf ; EBX指向显示缓冲区
00000019 85 C0 test eax,eax ; 判断数据是零、正数或负数
0000001B 75 05 jnz write1 ; 不是零，跳转
0000001D C6 03 30 mov byte ptr [ebx],'0' ; 是零，设置"0"
00000020 EB 27 jmp write5 ; 转向显示
00000022 79 06 write1: jns write2 ; 是正数，跳转
00000024 C6 03 2D mov byte ptr [ebx],'-' ; 是负数，设置负号"－"
00000027 43 inc ebx
00000028 F7 D8 neg eax ; 数据求补（绝对值）
0000002A B9 0000000A write2: mov ecx,10
0000002F 51 push ecx ; 10压入堆栈，作为退出标志
00000030 83 F8 00 write3: cmp eax,0 ; 数据（商）为零，转向保存
00000033 74 0A jz write4
00000035 33 D2 xor edx,edx ; 零位扩展被除数为EDX.EAX
00000037 F7 F1 div ecx ; 数据除以10：EDX.EAX÷10
00000039 83 C2 30 add edx,30h ; 余数（0～9）转换为ASCII码
0000003C 52 push edx ; 数据各位先低位后高位压入堆栈
0000003D EB F1 jmp write3
0000003F 5A write4: pop edx ; 数据各位先高位后低位弹出堆栈
00000040 3B D1 cmp edx,ecx ; 是结束标志10，转向显示
00000042 74 05 je write5
00000044 88 13 mov [ebx],dl ; 数据保存到缓冲区
00000046 43 inc ebx
00000047 EB F6 jmp write4
00000049 B8 00000000 R write5: mov eax,offset writebuf
0000004E E8 00000000 E call dispmsg
00000053 5A pop edx ; 恢复寄存器
00000054 59 pop ecx
00000055 5B pop ebx
00000056 C3 ret ; 子程序返回
00000057 write endp
00000057 read proc c ; 输入有符号十进制数的子程序
00000057 50 push eax ; 出口参数：变量TEMP＝补码表示的二进制数值
00000058 53 push ebx ; 说明：负数用"－"引导
00000059 51 push ecx
0000005A 52 push edx
0000005B B8 0000000C R read0: mov eax,offset readbuf
00000060 E8 00000000 E call readmsg ; 输入一个字符串
00000065 85 C0 test eax,eax
00000067 74 3A jz readerr ; 没有输入数据，转向错误处理
00000069 83 F8 0C cmp eax,12
0000006C 77 35 ja readerr ; 输入超过12个字符，转向错误处理
0000006E BA 0000000C R mov edx,offset readbuf ; EDX指向输入缓冲区
00000073 33 DB xor ebx,ebx ; EBX保存结果
00000075 33 C9 xor ecx,ecx ; ECX为正负标志，0为正，－1为负
00000077 8A 02 mov al,[edx] ; 取一个字符
00000079 3C 2B cmp al,'+' ; 是"＋"，继续
0000007B 74 09 jz read1
0000007D 3C 2D cmp al,'-' ; 是"－"，设置－1标志
0000007F 75 0C jnz read2
00000081 B9 FFFFFFFF mov ecx,-1
00000086 42 read1: inc edx ; 取下一个字符
00000087 8A 02 mov al,[edx]
00000089 84 C0 test al,al ; 是结尾0，转向求补码
0000008B 74 22 jz read3
0000008D 3C 30 read2: cmp al,'0' ; 不是0～9之间的数码，则输入错误
0000008F 72 12 jb readerr
00000091 3C 39 cmp al,'9'
00000093 77 0E ja readerr
00000095 2C 30 sub al,30h ; 是0～9之间的数码，则转换为二进制数
00000097 6B DB 0A imul ebx,10 ; 原数值乘10：EBX＝EBX×10
0000009A 72 07 jc readerr ; CF＝1，说明乘积溢出，输入数据超出32位范围，出错
0000009C 0F B6 C0 movzx eax,al ; 零位扩展，便于相加
0000009F 03 D8 add ebx,eax ; 原数值乘10后，与新数码相加
000000A1 73 E3 jnc read1 ; CF＝0，继续转换下一个数位
; CF＝1，说明输入数据超出32位范围，出错
000000A3 B8 000000D2 R readerr: mov eax,offset errmsg
000000A8 E8 00000000 E call dispmsg
000000AD EB AC jmp read0
;
000000AF 85 C9 read3: test ecx,ecx ; 判断是正数还是负数
000000B1 74 0C jz read4
000000B3 81 FB 80000000 cmp ebx,80000000h ; 负数超过231，出错
000000B9 77 E8 ja readerr
000000BB F7 DB neg ebx ; 是负数，进行求补
000000BD EB 08 jmp read5
000000BF 81 FB 7FFFFFFF read4: cmp ebx,7fffffffh ; 正数超过231-1，出错
000000C5 77 DC ja readerr
000000C7 89 1D 00000000 E read5: mov temp,ebx ; 设置出口参数
000000CD 5A pop edx
000000CE 59 pop ecx
000000CF 5B pop ebx
000000D0 58 pop eax
000000D1 C3 ret ; 子程序返回
000000D2 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
000000ED read endp
000000ED mean proc c ; 计算32位有符号数平均值子程序
000000ED 55 push ebp ; 入口参数：顺序压入数据个数和数组偏移地址
000000EE 8B EC mov ebp,esp ; 出口参数：EAX＝平均值
000000F0 53 push ebx ; 保护寄存器
000000F1 51 push ecx
000000F2 52 push edx
000000F3 8B 5D 08 mov ebx,[ebp+8] ; EBX＝堆栈中取出的偏移地址
000000F6 8B 4D 0C mov ecx,[ebp+12] ; ECX＝堆栈中取出的数据个数
000000F9 33 C0 xor eax,eax ; EAX保存和值
000000FB 33 D2 xor edx,edx ; EDX＝指向数组元素
000000FD 03 04 93 mean1: add eax,[ebx+edx*4] ; 求和
00000100 83 C2 01 add edx,1 ; 指向下一个数据
00000103 3B D1 cmp edx,ecx ; 比较个数
00000105 72 F6 jb mean1 ; 循环
00000107 99 cdq ; 将累加和EAX符号扩展到EDX
00000108 F7 F9 idiv ecx ; 有符号数除法，EAX＝平均值（余数在EDX中）
0000010A 5A pop edx ; 恢复寄存器
0000010B 59 pop ecx
0000010C 5B pop ebx
0000010D 5D pop ebp
0000010E C3 ret
0000010F mean endp
end
Microsoft (R) Macro Assembler Version 6.15.8803 08/19/07 15:14:34
eg0419s.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 0000002A Para Public 'DATA'
_TEXT . . . . . . . . . . . . . 32 Bit 0000010F Para Public 'CODE'
Procedures, parameters and locals:
N a m e Type Value Attr
ExitProcess . . . . . . . . . . P Near 00000000 FLAT Length= 00000000 External STDCALL
mean . . . . . . . . . . . . . . P Near 000000ED _TEXT Length= 00000022 Public C
mean1 . . . . . . . . . . . . L Near 000000FD _TEXT
read . . . . . . . . . . . . . . P Near 00000057 _TEXT Length= 00000096 Public C
read0 . . . . . . . . . . . . L Near 0000005B _TEXT
read1 . . . . . . . . . . . . L Near 00000086 _TEXT
read2 . . . . . . . . . . . . L Near 0000008D _TEXT
readerr . . . . . . . . . . . L Near 000000A3 _TEXT
read3 . . . . . . . . . . . . L Near 000000AF _TEXT
read4 . . . . . . . . . . . . L Near 000000BF _TEXT
read5 . . . . . . . . . . . . L Near 000000C7 _TEXT
write . . . . . . . . . . . . . P Near 00000000 _TEXT Length= 00000057 Public C
write0 . . . . . . . . . . . . L Near 00000008 _TEXT
write1 . . . . . . . . . . . . L Near 00000022 _TEXT
write2 . . . . . . . . . . . . L Near 0000002A _TEXT
write3 . . . . . . . . . . . . L Near 00000030 _TEXT
write4 . . . . . . . . . . . . L Near 0000003F _TEXT
write5 . . . . . . . . . . . . L Near 00000049 _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
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 000000D2 _TEXT
readbb . . . . . . . . . . . . . L Near 00000000 FLAT External STDCALL
readbd . . . . . . . . . . . . . L Near 00000000 FLAT External STDCALL
readbuf . . . . . . . . . . . . Byte 0000000C _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
temp . . . . . . . . . . . . . . DWord 00000000 FLAT External STDCALL
writebuf . . . . . . . . . . . . Byte 00000000 _DATA
0 Warnings
0 Errors
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