OpenWrt的编写和编译程序

时间:2019-04-27 07:50:55

标签: linux embedded cross-compiling openwrt

我有一个具有MIPS架构的嵌入式设备,可以在OpenWRT下工作

  

系统类型:联发科MT7628AN ver:1 eco:2
  机器:WRTnode2P   处理器:0
  cpu型号:MIPS 24KEc V5.5

我想通过计算机(ubuntu)编译C语言中的一个小程序

#include <stdio.h>

int main(void){
    printf("HelloWorld");
    return 0;
}

要编译它,我使用mips-linux-gnu-gcc命令

mips-linux-gnu-gcc -march=24kec -mabi=32 hello.c -o hello

我将hello程序发送到我的设备并制作chmod 755

chmod 755 hello

当我尝试执行它时出现错误

root@openWrt:/www# ./hello
./hello: line 1: syntax error: unexpected word (expecting ")")

我不知道发生了什么,我尝试了其他一些命令来像使用参数那样对其进行编译:-EB或-EL与否,-static或非,-mabi = 32,但不是,但是我有同样的问题。

有人帮我吗?

谢谢

[更新]

我向现有文件发送文件命令,这就是结果

fw3: ELF 32-bit LSB executable, MIPS, MIPS32 rel2 version 1, dynamically linked, interpreter /lib/ld., for GNU/Linux 3.2.0, stripped

所以我用这个命令编译程序

mipsel-linux-gnu-gcc -march=24kec -mips32r2  -mips16   hello.c -o hello

现在我有此文件命令结果

hello: ELF 32-bit LSB executable, MIPS, MIPS32 rel2 version 1 (SYSV), dynamically linked, interpreter /lib/ld., for GNU/Linux 3.2.0, BuildID[sha1]=cd12319441c530606d52d96478719b06a7b215a7, not stripped

现在我阅读了我的远程程序的ELF

ELF Header:
  Magic:   7f 45 4c 46 01 01 01 00 01 00 00 00 00 00 00 00 
  Class:                             ELF32
  Data:                              2's complement, little endian
  Version:                           1 (current)
  OS/ABI:                            UNIX - System V
  ABI Version:                       1
  Type:                              EXEC (Executable file)
  Machine:                           MIPS R3000
  Version:                           0x1
  Entry point address:               0x402c40
  Start of program headers:          52 (bytes into file)
  Start of section headers:          78592 (bytes into file)
  Flags:                             0x74001005, noreorder, cpic, o32, mips16, mips32r2
  Size of this header:               52 (bytes)
  Size of program headers:           32 (bytes)
  Number of program headers:         10
  Size of section headers:           40 (bytes)
  Number of section headers:         31
  Section header string table index: 30

这是我的hello程序readelf命令

ELF Header:
  Magic:   7f 45 4c 46 01 01 01 00 00 00 00 00 00 00 00 00 
  Class:                             ELF32
  Data:                              2's complement, little endian
  Version:                           1 (current)
  OS/ABI:                            UNIX - System V
  ABI Version:                       0
  Type:                              EXEC (Executable file)
  Machine:                           MIPS R3000
  Version:                           0x1
  Entry point address:               0x4005c0
  Start of program headers:          52 (bytes into file)
  Start of section headers:          6700 (bytes into file)
  Flags:                             0x74001007, noreorder, pic, cpic, o32, mips16, mips32r2
  Size of this header:               52 (bytes)
  Size of program headers:           32 (bytes)
  Number of program headers:         11
  Size of section headers:           40 (bytes)
  Number of section headers:         33
  Section header string table index: 30

有两个不同的ABI版本,标志中有图片

如果我尝试启动hello程序,则会出现此错误

hello: error while loading shared libraries: libc.so.6: cannot open shared object file: No such file or directory

我尝试添加-static参数,但是在启动hello程序时出现此错误

Illegal instruction

我总是会遇到这个问题。

1 个答案:

答案 0 :(得分:1)

我有一个类似的问题,并通过将Architect设置为 mipsle 来解决。我正在使用Go在此设备上为linux / mips构建二进制文件,

system type     : MediaTek MT7620A ver:2 eco:6
cpu model       : MIPS 24KEc V5.0
isa             : mips1 mips2 mips32r1 mips32r2
ASEs implemented    : mips16 dsp

第一次失败,

macbook:# cat main.go
package main

import (
    "fmt"
)

func main() {
    fmt.Println("hello, mips")
}

############# Setting GOARCH=mips ============

macbook:# GOOS=linux GOARCH=mips GOMIPS=softfloat go build -o hello-mips

openwrt:# ./hello-mips
./hello-mips: line 1: syntax error: unexpected "("

然后我意识到CPU架构是Little-Endian,而不是默认的Big-Endian。所以我更改了build参数,它现在成功了。

############# Setting GOARCH=mipsle ============

macbook:# GOOS=linux GOARCH=mipsle GOMIPS=softfloat go build -o hello
openwrt:# ./hello
hello, mips

您的CPU型号与我的CPU型号相同,只是版本MIPS 24KEc V5.5不同,它也必须是杂乱无章的(mipsel)。希望对您有所帮助。