20230813 arm64 汇编学习 helloworld.s

//
//Assembly program to print "helloworld" to stdout
//
//x0-x2 parameters to linux function services
//x8    linux function number

.global _start  // program starting address
_start:
        mov x0,1        //1 is linux stdout
        ldr x1,=helloworld      //string to print
        mov x2,13       //length to write to stdout
        mov x8,64       //64 is linux write system call
        svc 0   //call linux to output the string

//setup the parameters to exit the program then call linux to do it
        mov x0,0        //return num
        mov x8,93       //service code 93 terminates
        svc 0

.data
helloworld:     .ascii "Hello World!\n------\n"