> That patch would prevent us from picking up a legitimate ld.so.cache for the
> guest (in a chroot, for instance), so I don't think we should take it.
But in a chroot, QEMU_LD_PREFIX is most likely NOT set. So how about this
pseudocode?
if (strcmp (pathname, "/etc/ld.so.cache") == 0 && getenv ("QEMU_LD_PREFIX")
!= NULL) {
pathname = concat (getenv ("QEMU_LD_PREFIX"), pathname);
}
That is, redirect /etc/ld.so.cache to $QEMU_LD_PREFIX/etc/ld.so.cache if
and only if $QEMU_LD_PREFIX is set.
--
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https://bugs.launchpad.net/bugs/1701798
Title:
dynamically linked binaries crash for big-endian targets
Status in QEMU:
New
Bug description:
On the targets
hppa
m68k
mips
mips64
powerpc
powerpc64
s390x
sparc64
dynamically linked binaries crash, but statically linked binaries work.
On the targets
aarch64
alpha
armhf
powerpc64le
sh4
both dynamically linked and statically linked binaries work.
How to reproduce:
1) On Ubuntu 16.04, install the packages
g++-5-aarch64-linux-gnu
g++-5-alpha-linux-gnu
g++-5-arm-linux-gnueabihf
g++-5-hppa-linux-gnu
g++-5-m68k-linux-gnu
g++-5-mips-linux-gnu
g++-5-mips64-linux-gnuabi64
g++-5-powerpc-linux-gnu
g++-5-powerpc64-linux-gnu
g++-5-powerpc64le-linux-gnu
g++-5-s390x-linux-gnu
g++-5-sh4-linux-gnu
g++-5-sparc64-linux-gnu
2) Install qemu 2.9.0 from source (for m68k, use the 2.7.0-m68k
code from https://github.com/vivier/qemu-m68k.git):
$ ../configure --prefix=/home/bruno/inst-qemu/2.9.0
--target-list=aarch64-softmmu,alpha-softmmu,arm-softmmu,i386-softmmu,m68k-softmmu,mips-softmmu,mipsel-softmmu,mips64-softmmu,mips64el-softmmu,ppc-softmmu,ppc64-softmmu,s390x-softmmu,sh4-softmmu,sparc-softmmu,sparc64-softmmu,x86_64-softmmu,aarch64-linux-user,alpha-linux-user,arm-linux-user,hppa-linux-user,m68k-linux-user,mips-linux-user,mipsel-linux-user,mips64-linux-user,mips64el-linux-user,ppc-linux-user,ppc64-linux-user,ppc64le-linux-user,s390x-linux-user,sh4-linux-user,sparc-linux-user,sparc64-linux-user
--disable-strip --disable-werror --enable-gtk --enable-vnc
$ make
$ make install
3) Cross-compile the programs:
$ aarch64-linux-gnu-gcc-5 -O hello.c -o hello.aarch64
$ alpha-linux-gnu-gcc-5 -O hello.c -o hello.alpha
$ arm-linux-gnueabihf-gcc-5 -O hello.c -o hello.armhf
$ hppa-linux-gnu-gcc-5 -O hello.c -o hello.hppa
$ m68k-linux-gnu-gcc-5 -O hello.c -o hello.m68k
$ mips-linux-gnu-gcc-5 -O hello.c -o hello.mips
$ mips64-linux-gnuabi64-gcc-5 -O hello.c -o hello.mips64
$ powerpc-linux-gnu-gcc-5 -O hello.c -o hello.powerpc
$ powerpc64-linux-gnu-gcc-5 -O hello.c -o hello.powerpc64
$ powerpc64le-linux-gnu-gcc-5 -O hello.c -o hello.powerpc64le
$ s390x-linux-gnu-gcc-5 -O hello.c -o hello.s390x
$ sh4-linux-gnu-gcc-5 -O hello.c -o hello.sh4
$ sparc64-linux-gnu-gcc-5 -O hello.c -o hello.sparc64
4) Run the programs:
* aarch64 works:
$ QEMU_LD_PREFIX=/usr/aarch64-linux-gnu ~/inst-qemu/2.9.0/bin/qemu-aarch64
hello.aarch64
Hello world
* alpha works:
$ QEMU_LD_PREFIX=/usr/alpha-linux-gnu ~/inst-qemu/2.9.0/bin/qemu-alpha
hello.alpha
Hello world
* armhf works:
$ QEMU_LD_PREFIX=/usr/arm-linux-gnueabihf ~/inst-qemu/2.9.0/bin/qemu-arm
hello.armhf
Hello world
* powerpc64le works:
$ QEMU_LD_PREFIX=/usr/powerpc64le-linux-gnu
~/inst-qemu/2.9.0/bin/qemu-ppc64le hello.powerpc64le
Hello world
* sh4 works:
$ QEMU_LD_PREFIX=/usr/sh4-linux-gnu ~/inst-qemu/2.9.0/bin/qemu-sh4 hello.sh4
Hello world
* ===== sparc64 does not work:
$ QEMU_LD_PREFIX=/usr/sparc64-linux-gnu ~/inst-qemu/2.9.0/bin/qemu-sparc64
hello.sparc64
Segmentation fault (core dumped)
When I copy the file to a machine with `uname -srm` = "Linux 4.5.0-2-sparc64
sparc64",
it works:
$ ./hello.sparc64
Hello world
When I copy the file and its execution environment /usr/sparc64-linux-gnu to
the
same machine and run the binary in a chroot environment:
# /bin/hello.sparc64
Hello world
* ===== mips does not work:
$ QEMU_LD_PREFIX=/usr/mips-linux-gnu ~/inst-qemu/2.9.0/bin/qemu-mips
hello.mips
qemu: uncaught target signal 11 (Segmentation fault) - core dumped
When I copy the file to a machine with `uname -srm` = "Linux
3.16.0-4-4kc-malta mips",
it works:
$ ./hello.mips
Hello world
When I copy the file and its execution environment /usr/mips-linux-gnu to the
same machine and run the binary in a chroot environment:
# /bin/hello.mips
Hello world
* ===== mips64 does not work:
$ QEMU_LD_PREFIX=/usr/mips64-linux-gnuabi64 ~/inst-qemu/2.9.0/bin/qemu-mips64
hello.mips64
qemu: uncaught target signal 11 (Segmentation fault) - core dumped
When I copy the file to a machine with `uname -srm` = "Linux
3.16.0-4-5kc-malta mips64",
it works:
$ ./hello.mips64
Hello world
* ===== powerpc does not work:
$ QEMU_LD_PREFIX=/usr/powerpc-linux-gnu ~/inst-qemu/2.9.0/bin/qemu-ppc
hello.powerpc
qemu: uncaught target signal 11 (Segmentation fault) - core dumped
When I copy the file to a machine with `uname -srm` = "Linux
3.17.2-200.fc20.ppc64p7 ppc64",
it works:
$ ./hello.powerpc
Hello world
* ===== powerpc64 does not work:
$ QEMU_LD_PREFIX=/usr/powerpc64-linux-gnu ~/inst-qemu/2.9.0/bin/qemu-ppc64
hello.powerpc64
qemu: uncaught target signal 11 (Segmentation fault) - core dumped
When I copy the file to a machine with `uname -srm` = "Linux
3.17.2-200.fc20.ppc64p7 ppc64",
it works:
$ ./hello.powerpc64
Hello world
* ===== s390x does not work:
$ QEMU_LD_PREFIX=/usr/s390x-linux-gnu ~/inst-qemu/2.9.0/bin/qemu-s390x
hello.s390x
<hangs>
$ QEMU_LD_PREFIX=/usr/s390x-linux-gnu ~/inst-qemu/2.8.1/bin/qemu-s390x
hello.s390x
qemu-s390x: /media/develdata/devel/build/qemu-2.8.1/translate-all.c:175:
tb_lock: Assertion `!have_tb_lock' failed.
Segmentation fault (core dumped)
When I copy the file to a machine with `uname -srm` = "Linux 3.16.0-4-s390x
s390x",
it works:
$ ./hello.s390x
Hello world
* ===== hppa does not work:
$ QEMU_LD_PREFIX=/usr/hppa-linux-gnu ~/inst-qemu/2.9.0/bin/qemu-hppa
hello.hppa
Segmentation fault (core dumped)
* ===== m68k does not work:
$ QEMU_LD_PREFIX=/usr/m68k-linux-gnu QEMU_CPU=m68020
~/inst-qemu/2.9.0/bin/qemu-m68k hello.m68k
qemu: uncaught target signal 4 (Illegal instruction) - core dumped
$ QEMU_LD_PREFIX=/usr/m68k-linux-gnu QEMU_CPU=m68020
~/inst-qemu/2.7.0-m68k/bin/qemu-m68k hello.m68k
qemu: uncaught target signal 11 (Segmentation fault) - core dumped
The set of targets where it does not work is exactly the big-endian targets.
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