On Thu, Dec 11, 2014 at 10:06:23AM +0100, Dominik Vogt wrote: > On s390x, the static chain register cannot be used for passing the > Go closure pointer to a function: According to the Abi, the > dynamic linker is allowed to destroy the contents of r0 (static > chain register) eventually causing a crash if libgo is linked > dynamically. The assumption that the static chain register can be > used to pass information to a function is wrong for s390x.
I was worried about exactly the same "problem" on powerpc with r11 being used for the static chain and also destroyed in linkage stubs. It turns out we don't traverse any linkage stubs. See https://gcc.gnu.org/ml/gcc-patches/2014-11/msg00446.html. -- Alan Modra Australia Development Lab, IBM
