打印注册在大会86 [英] Print Register in Assembly x86

问题描述

随后几个联机文档，然而，当我尝试打印的数量我都存储在寄存器％ecx中没有任何反应。难道这是因为我本质上进行计算，然后试图打印，而在一个循环？

  MOV $ 48％ECX #Convert为ASCII
   MOV $ 1，EDX％字节#PRINT
   添加％EAX，ECX％   MOV $ 4，％EAX #Output到控制台
   MOV $ 1，％ebx中#FILE描述 -  Standardout
   诠释$ 0x80的#CALL内核
 

解决方案

的写系统调用希望打印的指针数据。据我所知，你有一个单一的数字。您可以临时存储在堆栈上要打印如下：

  MOV $ 48％ECX #Convert为ASCII
MOV $ 1，EDX％字节#PRINT
添加％EAX，ECX％
推栈％ECX＃店面
MOV％ESP，ECX％负载＃地址
MOV $ 4，％EAX＃输出到控制台
MOV $ 1，EBX％＃文件描述符 -  Standardout
INT 0x80的$＃调用内核
流行％ECX＃清理堆栈
 

记住，你将需要多位数更好的转换过程。

Followed a couple of online documents and yet when I try to print the number I have stored in the register %ecx nothing happens. Could this be because I'm essentially performing calculations and then trying to print while in a loop?

   mov     $48, %ecx  #Convert to ascii
   mov     $1, %edx   #Print Byte
   add     %eax, %ecx

   mov     $4, %eax          #Output To Console
   mov     $1, %ebx          #File Descriptor - Standardout
   int      $0x80            #Call the Kernel

解决方案

The write system call expects a pointer to the data to be printed. As far as I can tell, you have a single digit. You can temporarily store that on the stack for printing as follows:

mov     $48, %ecx  #Convert to ascii
mov     $1, %edx   #Print Byte
add     %eax, %ecx
push    %ecx       # store on stack
mov     %esp, %ecx # load address
mov     $4, %eax   # Output To Console
mov     $1, %ebx   # File Descriptor - Standardout
int     $0x80      # Call the Kernel
pop     %ecx       # clean up stack

Remember that you will need a better conversion routine for multi-digit numbers.

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