Question

很明显，WSL不支持32位系统调用
谢谢Timothy Baldwin！我做了一个简单的程序来返回数组的最高元素，但$ echo $?回声1而不是222 我用作GNU汇编程序

/*
%edi will hold the current position in the list.
%ebx will hold the current highest value in the list.
%eax will hold the current element being examined
*/

# data_items - contains the item data. A 0 is used
# to terminate the data

.section .data

data_items: #These are the data items
.long 3,67,34,222,45,75,54,34,44,33,22,11,66,0


.section .text

.globl _start

_start:
  movl $0, %edi                  # zero into index register 
  movl data_items(,%edi,4), %eax #load the first bit
  movl %eax, %ebx                # since this is the first item, %eax is the biggest

start_loop:                      # start loop 
  cmpl $0, %eax                      # check if element==0
  je loop_exit                   
  incl %edi                      # load next element
  movl data_items(,%edi,4), %eax
  cmpl %eax, %ebx                # compare value
  jle start_loop                 # jump to beginning if element is not the largest


  movl %eax, %ebx                # move the value as the largest

  jmp start_loop                 # go to beginning

  loop_exit:
    movl $1, %eax                # exit

  int $0x80                      #call kernel

Answer 1

您的代码大部分都是正确的，但错误是由错误的Jcc指令引起的。所以改变行

jle start_loop   # jump to beginning if element is not the largest

到右Jcc指令

jge start_loop   # jump to beginning if element is not the largest

并且您的代码按预期工作。

ASM程序返回1而不是预期值WSL

1 个答案: