Linux manages to have three separate orderings of the arguments to
the clone() syscall on different architectures. In the kernel these
are selected via CONFIG_CLONE_BACKWARDS and CONFIG_CLONE_BACKWARDS2.
Clean up our implementation of this to use similar #define names
rather than a TARGET_* ifdef ladder.

This includes behaviour changes fixing bugs on cris, x86-64, m68k,
openrisc and unicore32.  cris had explicit but wrong handling; the
others were just incorrectly using QEMU's default, which happened
to be the equivalent of CONFIG_CLONE_BACKWARDS. (unicore32 appears
to be broken in the mainline kernel in that it tries to use arg3 for
both parent_tidptr and newtls simultaneously -- we don't attempt
to emulate this bug...)
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>
Signed-off-by: NRiku Voipio <riku.voipio@linaro.org>

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@3396 c046a42c-6fe2-441c-8c8c-71466251a162

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@1066 c046a42c-6fe2-441c-8c8c-71466251a162

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@386 c046a42c-6fe2-441c-8c8c-71466251a162