gem5 系统调用仿真臂 C hello world 失败,“致命:系统调用 gettid (#224) 未实现" [英] gem5 syscall emulation arm C hello world fails with "fatal: syscall gettid (#224) unimplemented"
问题描述
我在 gem5 中遇到以下错误.这仅发生在 ARM 中.使用 X86,我看到一些系统调用被忽略,但没有导致致命错误.
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
我在 gem 中找到了 这个 的常见问题解答.但现在它显示这个错误:
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.
我正在使用这个在 Ubuntu 18.04 中编译:
I am compiling in Ubuntu 18.04 using this:
arm-linux-gnueabi-gcc hello.c -o hello -static -DUNIX
有没有人找到一种方法来编译一个简单的 hello world,针对 ARM,不使用 gem5 不支持的系统调用?有预编译的例子,所以一定有办法.
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 hello world 正在开发 Ubuntu 18.04 预打包工具链,请参阅:如何在 gem5 中编译和运行可执行文件使用 se.py 的系统调用仿真模式?
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?
致命:内核太旧"之前曾在以下位置询问过:如何解决致命:内核太旧"在系统调用仿真 SE 模式下运行 gem5 时?
"FATAL: kernel too old" has been previously asked at: How to solve "FATAL: kernel too old" when running gem5 in syscall emulation SE mode?
如该页面所述,该消息来自 glibc 健全性检查,而 ct-ng
是克服它的最明智的方法.
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 会忽略它们并且 arm 会崩溃,但是如果您提供 x86 系统调用被忽略的消息,应该很容易在源代码中找到它.
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.
但是这种爆炸行为似乎是合理的:当你的程序试图运行一个未实现的系统调用时,你怎么能期望它能够正常工作?
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?
大多数系统调用在两个架构中都未实现,如下所示:
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/src/arch/x86/linux/process.cc#L222
所以,我只看到两个合理的解决方案:
So, I only see two sensible solutions:
- 实现系统调用,这对大多数人来说很容易,并向 gem5 发送补丁
- 看看其他 archs 是否通过 grepping 实现了它,有时另一个 arch 已经实现了它,你只需要写下东西
- 您也可以尝试忽略系统调用,TODO:在 ARM 中有什么好方法吗?但你必须非常确定这无关紧要.
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