This is just e3d658b applied to SystemZ. An example of this being used in the wild: https://sourceware.org/git/?p=glibc.git;a=blob;f=sysdeps/s390/s390-64/start.S;h=59eeb7e998227bdf32029cd074f0876c450404ea;hb=HEAD#l63
This is just e3d658b applied to SystemZ. An example of this being used in the wild: https://sourceware.org/git/?p=glibc.git;a=blob;f=sysdeps/s390/s390-64/start.S;h=59eeb7e998227bdf32029cd074f0876c450404ea;hb=HEAD#l63