Dear gem5 users,
I successfully built an x86 on gem5 with scons build/x86/gem5.opt.
Then, I compiled a C code on my host (an x86 running an Ubuntu 14.04.2
LTS with kernel version 3.16.0-38-generic) and mounted the executable on
the disk image linux-x86.img.
After executing :
build/X86/gem5.opt configs/example/fs.py --disk-image=linux-x86.img
and launching the execution of my executable (through terminal) I got
the message: "kernel too old" (according to the posts on the gem5
mailing list this is due to a version problem of glibc).
In fact, applying "file" command to my executable, I get : "statically
linked, for GNU/Linux 2.6.24" whereas the kernel used by gem5 is the one
you get from "http://www.m5sim.org/Download"; (full system files for x86)
which is "version 2.6.22.9".
I basically need a newer kernel for the x86 on gem5.
------------------------------------------------------------------
For getting a newer version of the kernel I followed the simple
indications from : http://www.m5sim.org/Linux_kernel to compile a
2.6.28.4 kernel.
While executing "make vmlinux -j 4" or simply "make" (I tried both) this
error appeared:
ursu@ursu-OptiPlex-745:~/linux-2.6.28.4$ make vmlinux -j 4
CHK include/linux/version.h
CHK include/linux/utsrelease.h
SYMLINK include/asm -> include/asm-x86
CALL scripts/checksyscalls.sh
CHK include/linux/compile.h
VDSO arch/x86/vdso/vdso.so.dbg
gcc: error: elf_x86_64: No such file or directory
gcc: error: unrecognized command line option ‘-m’
make[1]: *** [arch/x86/vdso/vdso.so.dbg] Error 1
make: *** [arch/x86/vdso] Error 2
make: *** Waiting for unfinished jobs....
After searching in google, the typical answer was:
Edit "arch/x86/vdso/Makefile":
Change "-m elf_x86_64" to "-m64"
Change "-m elf_x86" to "-m32"
I did it and executed "make vmlinux -j 4" again :
ursu@ursu-OptiPlex-745:~/linux-2.6.28.4$ make vmlinux -j 4
CHK include/linux/version.h
CHK include/linux/utsrelease.h
SYMLINK include/asm -> include/asm-x86
CALL scripts/checksyscalls.sh
CHK include/linux/compile.h
VDSO arch/x86/vdso/vdso.so.dbg
gcc: error: : No such file or directory
make[1]: *** [arch/x86/vdso/vdso.so.dbg] Error 1
make: *** [arch/x86/vdso] Error 2
make: *** Waiting for unfinished jobs....
make: *** wait: No child processes. Stop.
There, I don't find any solution.
-----------------------------------------------------------------------------
-----------------------QUESTIONS :
----------------------------------------
At this point I don't really know what to do :
--Comments on google indicate that it is not obvious to compile and use
an older version of glibc on a computer having a new version.
--Trying to use crosstools
(http://www.kegel.com/crosstool/crosstool-0.43/doc/crosstool-howto.html)
for building a crosscompiler targetting an
x86_64--gcc-4.1.0--glibc-2.3.6 (hopping that gcc-4.1.0--glibc-2.3.6 will
be ok for kernel 2.6.22.9) leads to many errors during compilation. Is
this a good path ?
Does someone know how the kernel 2.6.22.9 (from
http://www.m5sim.org/Download) was compiled for gem5 ?
How do you proceed for compiling kernels for your gem5 simulations ?
Best regards,
Roman Ursu
http://www.m5sim.org/Linux_kernel
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