Linux 64位汇编调用C语言库函数，以编写了一个调用printf函数，显示字符串“Hello World”的程序为例。

.section .data
fmt:	.asciz "Hello %s\n"
arg:	.asciz "World"

.section .text
.global _start
_start:
	
	# call printf
	movq $fmt, %rdi
	movq $arg, %rsi
	call printf
		
	# call exit
	movq $0, %rdi
	call exit

编译运行：

[ycxie@localhost Workspace]$ as -o demo_libc.o demo_libc.s
[ycxie@localhost Workspace]$ ld -lc -I /usr/lib64/ld-linux-x86-64.so.2 -o demo_libc demo_libc.o
[ycxie@localhost Workspace]$ ./demo_libc
Hello World