汇编at&t

.section .data
data_items:
  .long 3, 74, 34, 222, 34, 75, 54, 34, 44, 33, 22, 11, 66
len = . - data_items

.section .text
.globl _start
_start:
  mov $-4, %rdi
  movl data_items(,1), %ebx
start_loop:
  add $4, %rdi
  # 比较是否到最后一个元素
  cmp $len, %rdi
  jae exit_loop
  # 取元素比较大小
  movl data_items(, %rdi), %eax
  cmp %rax, %rbx
  jle assign_max
  jmp start_loop
assign_max:
  mov %rax, %rbx
  jmp start_loop
exit_loop:
  mov $1, %rax
  int $0x80

rasak@515jzl:~/Programs$ as -o demo.o demo.s
rasak@515jzl:~/Programs$ ld -d demo.o -o demo
rasak@515jzl:~/Programs$ ./demo
rasak@515jzl:~/Programs$ echo $?
222

.section .text
.globl _start
_start:
  push $3
  push $5
  pop %rax
  pop %rbx