1. ARM 汇编

简单aarch64汇编编程介绍 [1]

data段

汇编

.section ".data"
c:
.byte 'a'
s:
.short 12
i:
.word 345
l:
.quad 6789

static char  c = 'a';
static short s = 12;
static int  i = 345;
static long l = 6789;

.section instruction (to announce DATA section)
label definition (marks a spot in RAM)
.byte instruction (1 byte)
.short instruction (2 bytes)
.word instruction (4 bytes)
.quad instruction (8 bytes)

adr指令

C语言 static int length = 1; static int width = 2; static int perim = 0; int main() { perim =(length + width) * 2; return 0; }

汇编 .section .data length: .word 1 width: .word 2 perim: .word 0 .section .text .global main main: adr x0, length ldr w1, [x0] adr x0, width ldr w2, [x0] add w1, w1, w2 lsl w1, w1, 1 adr x0, perim str w1, [x0] mov w0, 0 ret

.data: read-write
.rodata: read-only
.bss: read-write, initialized to zero
.text: read-only, program code
Stack and heap work differently!

[1]	https://www.cs.princeton.edu/courses/archive/spring19/cos217/lectures/13_Assembly1.pdf