由于无效的ELF头文件，MIPS仿真程序无法运行mips可执行文件

Question

所以我想开始编写一些mips程序集，并设置我的工具。 我正在使用Arch Linux，并从用户存储库安装了交叉mipsel-linux-gnu-gcc和binutils，这很好用，并且成功地将我的简单测试程序编译为mipsel二进制文件。

我不想要任何花式的gui或类似的东西来模仿我，并且去了qemu。这是我有问题。当我尝试运行我的可执行文件qemu-mipsel ./test时，qemu只是回复./test: Invalid ELF image for this architecture。

的第一件事，我虽然是“可以QEMU真的只是运行基地MIPS的二进制文件这样呢？这看起来几乎像魔术，这不可能是正确的。”，所以我就开始使用Google，如果它实际上是可能的，found a tutorial on how to to similar compilation for a openwrt but with C code <，在看完这篇教程之后，我的步骤似乎也应该起作用。

这是我编的组装，清洁，简单的命令 mipsel-linux-gnu-as test.asm -o test; chmod +x ./test

这里的file命令 ./test: ELF 32-bit LSB relocatable, MIPS, MIPS-I version 1 (SYSV), not stripped

这里的输出年代readelf -a ./test

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:        REL (Relocatable file) 
    Machine:       MIPS R3000 
    Version:       0x1 
    Entry point address:    0x0 
    Start of program headers:   0 (bytes into file) 
    Start of section headers:   164 (bytes into file) 
    Flags:        0x1000, o32, mips1 
    Size of this header:    52 (bytes) 
    Size of program headers:   0 (bytes) 
    Number of program headers:   0 
    Size of section headers:   40 (bytes) 
    Number of section headers:   9 
    Section header string table index: 6 

Section Headers: 
    [Nr] Name    Type   Addr  Off Size ES Flg Lk Inf Al 
    [ 0]     NULL   00000000 000000 000000 00  0 0 0 
    [ 1] .text    PROGBITS  00000000 000040 000010 00 AX 0 0 16 
    [ 2] .data    PROGBITS  00000000 000050 000000 00 WA 0 0 16 
    [ 3] .bss    NOBITS   00000000 000050 000000 00 WA 0 0 16 
    [ 4] .reginfo   MIPS_REGINFO 00000000 000050 000018 18 A 0 0 4 
    [ 5] .pdr    PROGBITS  00000000 000068 000000 00  0 0 4 
    [ 6] .shstrtab   STRTAB   00000000 000068 00003a 00  0 0 1 
    [ 7] .symtab   SYMTAB   00000000 00020c 000060 10  8 6 4 
    [ 8] .strtab   STRTAB   00000000 00026c 000001 00  0 0 1 
Key to Flags: 
    W (write), A (alloc), X (execute), M (merge), S (strings) 
    I (info), L (link order), G (group), T (TLS), E (exclude), x (unknown) 
    O (extra OS processing required) o (OS specific), p (processor specific) 

There are no section groups in this file. 

There are no program headers in this file. 

There are no relocations in this file. 

The decoding of unwind sections for machine type MIPS R3000 is not currently supported. 

Symbol table '.symtab' contains 6 entries: 
    Num: Value Size Type Bind Vis  Ndx Name 
    0: 00000000  0 NOTYPE LOCAL DEFAULT UND 
    1: 00000000  0 SECTION LOCAL DEFAULT 1 
    2: 00000000  0 SECTION LOCAL DEFAULT 2 
    3: 00000000  0 SECTION LOCAL DEFAULT 3 
    4: 00000000  0 SECTION LOCAL DEFAULT 4 
    5: 00000000  0 SECTION LOCAL DEFAULT 5 

No version information found in this file. 

Answer 1

输出你已经忘记链接你的代码。汇编程序as只产生目标文件，你需要链接它。想必你想要的东西，如：

mipsel-linux-gnu-as test.asm -o test.o 
mipsel-linux-gnu-ld test.o -o test 

如果你这样做是正确的file命令的输出应包括executable，如：

ELF 32-bit LSB executable, MIPS, MIPS-I version 1 (SYSV), statically linked, not stripped