gem5 syscall仿真臂C hello world因“致命：未实现syscall gettid（＃224）”而失败。 [英] gem5 syscall emulation arm C hello world fails with "fatal: syscall gettid (#224) unimplemented"

问题描述

我在gem5中出现以下错误。这仅在ARM中发生。使用X86时，我看到一些系统调用被忽略了，但没有一个致命错误。

I am having the following error in gem5. This happens in ARM only. With X86 I see some syscalls being ignored but none causing a fatal error.

tomas@ubuntu:~/gem5$ ./build/ARM/gem5.opt configs/example/arm/starter_se.py ../tests_gem5/hello
gem5 Simulator System.  http://gem5.org
gem5 is copyrighted software; use the --copyright option for details.

gem5 compiled Jul  9 2018 17:09:01
gem5 started Jul  9 2018 18:07:37
gem5 executing on ubuntu, pid 5064
command line: ./build/ARM/gem5.opt configs/example/arm/starter_se.py ../tests_gem5/hello

info: 1. command and arguments: ['../tests_gem5/hello']
Global frequency set at 1000000000000 ticks per second
warn: DRAM device capacity (8192 Mbytes) does not match the address range assigned (1024 Mbytes)
warn: DRAM device capacity (8192 Mbytes) does not match the address range assigned (1024 Mbytes)
0: system.remote_gdb: listening for remote gdb on port 7000
info: Entering event queue @ 0.  Starting simulation...
fatal: syscall openat (#322) unimplemented.
Memory Usage: 2246296 KBytes

我发现此答案在gem5的常见问题解答中。但是现在它显示了此错误：

I found this answer in gem5's FAQ. But now it shows this error:

warn: ignoring syscall openat(...)
FATAL: kernel too old
warn: ignoring syscall rt_sigprocmask(...)
      (further warnings will be suppressed)
fatal: syscall gettid (#224) unimplemented.

我正在Ubuntu 18.04中使用以下命令进行编译：

I am compiling in Ubuntu 18.04 using this:

arm-linux-gnueabi-gcc hello.c -o hello -static -DUNIX

是否有人找到一种针对ARM的简单hello世界的编译方法，该世界不使用gem5不支持的syscall？有预编译的示例，因此必须有一种方法。

Has anyone found a way to compile a simple hello world, targeting ARM, that doesn't use syscalls not supported by gem5? There are pre-compiled examples so there must be a way.

推荐答案

更新：x86，arm和aarch64 C语言世界正在运行在Ubuntu 18.04预打包的工具链上，请参阅：如何使用se.py在gem5 syscall仿真模式下编译和运行可执行文件？

update: x86, arm and aarch64 C hello world is working on Ubuntu 18.04 pre-packaged toolchain, see: How to compile and run an executable in gem5 syscall emulation mode with se.py?

FATAL ：内核太旧了，以前曾在以下位置被问过：如何解决致命错误：内核太旧

"FATAL: kernel too old" has been previously asked at: How to solve "FATAL: kernel too old" when running gem5 in syscall emulation SE mode?

如该页所述，该消息来自glibc完整性检查，而 ct-ng 是克服该问题的最明智的方法。

As explained in that page, that message comes from a glibc sanity check, and ct-ng is the sanest approach to overcome it.

至于未实现的系统调用，我不知道为什么x86会忽略它们并设防炸毁，但如果您给出x86 syscall忽略的消息，则应该很容易地在源代码中进行重复显示。

As for the unimplemented syscalls, I don't know why x86 ignores them and arm blows up, but it should be easy to grep that up in the source if you give the x86 syscall ignored message.

但是炸毁行为确实很明智：如何您是否希望程序在尝试运行未实现的系统调用时能够正常运行？

But the blow up behavior does seem sensible: how can you expect your program to work properly when it tries to run an unimplemented syscall?

两个弓中的大多数系统调用都未实现，如以下所示：

Most syscalls are unimplemented in both archs as can be seen at:

• https://github.com/gem5/gem5/blob/5de8ca95506a5f15bfbfdd2ca9babd282a882d1f/src/arch/arm/linux/process.cc#L123


• https://github.com/gem5/gem5/blob/5de8ca95506a5f15bfbfdd2ca9babd282a882d1f/s/ ＃L222

• https://github.com/gem5/gem5/blob/5de8ca95506a5f15bfbfdd2ca9babd282a882d1f/src/arch/arm/linux/process.cc#L123
• https://github.com/gem5/gem5/blob/5de8ca95506a5f15bfbfdd2ca9babd282a882d1f/src/arch/x86/linux/process.cc#L222

因此，我只看到两个明智的解决方案：

So, I only see two sensible solutions:

• 实施系统调用，这对于大多数人来说都很容易，并向gem5发送补丁
  
  
  
  
  • 拱门通过grepping来实现它，有时另一个拱门已经实现了它，而您只需要编写东西
  
  
  • 您还可以尝试忽略syscall，TODO：ARM中是否有一个好的方法？但是您必须非常确定这不会有问题。
  
  

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