Re: Cannot run simple binary executable file

[Maciej Borzecki <maciej.borzecki@open-rnd.pl>]

On Thursday 09 of October 2014 05:34:29 Wy kevinthesun wrote:
> Hi Denys, I have tried 1.5.1 and 1.3. All of them use ld-linux.so.3.
> Actually in the /lib directory of these toolchains I only find
> ld-linux.so.3.

Try running 'readelf -a <yourbinary> |grep FP' this should give a hint on the 
setting of -mfloat-abi that was used during compilation. This post might 
explain more: https://gcc.gnu.org/ml/gcc-help/2012-02/msg00082.html

readelf will also give you the interpreter name that the binary wants to be 
run with (in your case it should be ld-linux.so.3). However, I've also seen 
ld-linux.so.3 being symlinked to proper armhf.so (and program binaries would 
use ld-linux.so as interpreter) or the other way round, so whatever readelf 
prints as the requested interpreter might not necessarily be conclusive.

Long shot, but have you tried grabbing ld-linux.so* from 1.5 and calling it on 
1.6 like this?
	./ld-linux.so.3 ./yourbinary


> 
> Thank you.
> 
> 2014-10-09 4:43 GMT+08:00 Denys Dmytriyenko <denis@denix.org>:
> > On Tue, Oct 07, 2014 at 07:05:42PM -0700, Wy kevinthesun wrote:
> > > However, a new problem occurs. Now when I tries run HelloWorld binary,
> > > after "Hello World" is printed, the terminal also prints "Segmentation
> > > fault". It seems that some memory problems occurs. I guess it comes from
> > > that the 1.5.1 yocto system on boards hopes ld-linux-armhf.so.3 as
> > 
> > dynamic
> > 
> > > linker, instead of ld-linux.so.3, which is used by toolchain. There may
> > 
> > be
> > 
> > > some memory address problem between them. How can I solve it?
> > 
> > As Nicolas suggested earlier, it seems you are trying to mix ABIs here.
> > Because ld-linux-armhf.so.3 indicates the system uses hardfp ABI, but the
> > example app you built with your toolchain wants ld-linux.so.3, which is
> > usually the old softfp ABI. You'd need to match ABIs and the easiest
> > solution
> > is to use the same toolchain that was used to build the system (1.5.1?)
> > 
> > --
> > Denys
> > 
> > > 2014-10-07 18:17 GMT-07:00 Wy kevinthesun <kevinthesunwy@gmail.com>:
> > > > Problem solved! It turns out it is the mismatch of ld-linux.so. I
> > 
> > referred
> > 
> > > > to this post
> > 
> > http://stackoverflow.com/questions/24543474/cross-compiled-gnu-arm-beagleb
> > oneblack-from-windows-runtime-error-on-elf ,
> > 
> > > > and found my problem was exactly the same: the binary needs
> > > > /lib/ld-linux.so.3 to run, but that file is missing in the 1.5.1 yocto
> > > > system on board. Then I copied ld-linux.so.3 file from Yocto toolchain
> > 
> > on
> > 
> > > > my pc. Then it works!
> > > > 
> > > > Thank you!
> > > > 
> > > > 2014-10-07 8:21 GMT-07:00 Nicolas Dechesne <
> > 
> > nicolas.dechesne@linaro.org>:
> > > > On Tue, Oct 7, 2014 at 1:07 PM, Wy kevinthesun <
> > 
> > kevinthesunwy@gmail.com>
> > 
> > > >> wrote:
> > > >> > Hi, I am new to Yocto Project and learning to develop software on
> > 
> > Atmel
> > 
> > > >> > SAMA5D3 Xplained board, on which Yocto 1.5.1 is pre-built. I
> > 
> > followed
> > 
> > > >> the
> > > >> 
> > > >> > instructions and got the 1.6.1 toolchain
> > > >> > 
> > > >> > poky-eglibc-i686-core-image-sato-armv7a-vfp-neon-toolchain-1.6.1.sh
> > 
> > .
> > 
> > > >> > I can compile the simple HelloWorld program and binary file is
> > > >> > made.
> > > >> 
> > > >> Then I
> > > >> 
> > > >> > copied the binary file
> > > >> > 
> > > >> > into board and tried to run it. However, when I changed to the file
> > > >> 
> > > >> located
> > > >> 
> > > >> > directory and type
> > > >> > 
> > > >> > "./Hello", it returned "sh: ./Hello: No such file or directory".
> > 
> > Then I
> > 
> > > >> > tried "sh Hello", it gave
> > > >> > 
> > > >> > me  "Hello: Hello: cannot execute binary file ". If I type "file
> > > >> 
> > > >> Hello", it
> > > >> 
> > > >> > gives "Hello: ELF 32-bit
> > > >> > 
> > > >> >  LSB  executable, ARM, EABI5 version 1 (SYSV), dynamically linked
> > 
> > (uses
> > 
> > > >> > shared libs), for GNU/Linux 2.6.16,
> > > >> > BuildID[sha1]=9933a2d2ce212099c5f9902a8e612c1423e136da, not
> > 
> > stripped". I
> > 
> > > >> > googled and someone
> > > >> > 
> > > >> > said the problem may be the toolchain. Then I tried 1.3, 1.5.1
> > > >> 
> > > >> toolchain for
> > > >> 
> > > >> > arm, but still same
> > > >> > 
> > > >> > error. Could you please help me about this problem?
> > > >> 
> > > >> i suspect this is an armv7 soft-float vs hard-float mismatch. Either
> > > >> your prebuilt OE system is configured with soft-float and the
> > > >> toolchain you use compiled for hard-float by default, or the other
> > > >> way
> > > >> around. can you check how you've compile HelloWolrd and check the
> > > >> other ABI?
> > > 
> > > --
> > > _______________________________________________
> > > yocto mailing list
> > > yocto@yoctoproject.org
> > > https://lists.yoctoproject.org/listinfo/yocto

-- 

Maciej Borzęcki 
Senior Software Engineer Open-RnD Sp. z o.o. 
www.open-rnd.pl, Facebook, Twitter 
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