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From: Felix Janda <felix.janda@posteo.de>
Newsgroups: gmane.linux.lib.musl.general
Subject: debugging problem with musl ld and qemu-ppc
Date: Thu, 16 Oct 2014 08:09:01 +0200
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Hello list,

can you maybe help me debugging the following problem with qemu-ppc?
It gives an invalid instruction error after doing:

tar -xf crossx86-powerpc-linux-musl-0.9.9.tar.xz
# (I get something similar for other versions of musl or gcc)
cat > a.s <<EOF
b	_GLOBAL_OFFSET_TABLE_@local
EOF
cat > b.c <<EOF
int main(void) { return 0; }
EOF
./powerpc-linux-musl/bin/powerpc-linux-musl-gcc -o good b.c
./powerpc-linux-musl/bin/powerpc-linux-musl-gcc -o bad a.s b.c
# set up symlinks to make 'qemu-ppc good' work
qemu-ppc bad

After musl ld has done its work it jumps to libgcc's _init and
very soon tries to execute some data.

When executing in some chroot the 'qemu-ppc -d in_asm' for
good and bad is exactly the same up to two instructions in
libgcc until it diverges (and bad crashes).

Do you have any ideas what could be the problem?

Thanks,
Felix