Examples of assembly language programs

The main function of this program is to display the CPU vendor's vendor ID

The source code is as follows:

. Section. Data#x是占位符Output:. ASCII"The processor Vendor ID is: ' xxxxxxxxxx ' \ n"#_start和output都是标签. section. Text#如果用gcc编译的话, _start will change to main. Global _START_START:MOVL $,%eaxCpuid#相当于把字符串output的地址传入到寄存器edi中.Movl$output,%edi#将调用cpuid命令的内容放入指定的内存Movl%EBX, -(%edi) MOVL%edx, +(%edi) MOVL%ecx, $(%edi)#4表示系统调用的值, 1 represents the file descriptor, and output is the input characterMovl$4,%eaxMovl $,%EBXMovl$output,%ecxMovl$42,%edx# "int $0x80" is a system call interruptint  $x80Movl $,%eaxMovl $,%EBXint  $x80

Compile

As-o CPUID.O ASSEMBLY_TEMPLATE.S
Ld-o CPUID CPUID.O

Perform

./cpuid

Output

The processor Vendor ID Is:genuineintel

Examples of assembly language programs