[asm] as - linux64

[asm]  as - linux64

 

 

 

 

1　　code

 

[root@rocky:src]# cat  hello64.as
# filename = hello64.as


.data
        msg     :       .string "Hello, World!\n"
        len     =       .       -       msg


.text
.global _start

_start:
        movq $len, %rdx
        movq $msg, %rsi
        movq $1, %rdi
        movq $1, %rax   # 64bit_sys_write=1
        syscall

        movq $0, %rdi
        movq $60, %rax  # 64bit_sys_exit=60
        syscall
[root@rocky:src]# 
[root@rocky:src]# 
[root@rocky:src]# as -o hello64.o hello64.as  &&  ld -s -o hello64 hello64.o  &&  ./hello64
Hello, World!
[root@rocky:src]# 
[root@rocky:src]# 

 

 

 

2　　compile,　　link,　　execute

 

[root@rocky:src]# as -o hello64.o hello64.as  &&  ld -s -o hello64 hello64.o  &&  ./hello64
Hello, World!
[root@rocky:src]# 
[root@rocky:src]# 

 

 

 

 

3.　　reference

 

　　1)　　AT&T汇编　　-　　https://www.jianshu.com/p/1b4703410ebe

 

　　2)　　Linux系统64位AT&T系统调用汇编指令syscall　　-　　https://blog.csdn.net/qq_42108074/article/details/132804264