Date: Sun, 19 Apr 2015 12:44:15 +0100 From: Justin Cormack <justin@...cialbusservice.com> To: musl@...ts.openwall.com Subject: ppc64 ABI I am looking at doing a ppc64 port, and after some discussion on irc last night wondering which ABI to port to. ppc64 has two ABIs: v1: as documented here http://refspecs.linuxfoundation.org/ELF/ppc64/PPC-elf64abi-1.9.html Slightly odd, as has function descriptors, so you cant just reference a function pointer, mainly makes asm code messier as needs a header for every function. Traditionally bigendian. Fedora and Gentoo do distros, not sure there are any others; FreeBSD support also exists. v2, usually known as powerpc64le, helpfully. It is not little endian exclusively, but there are no existing distros that are big endian. Aim was to make it much closer to a standard ABI, so function pointers are gone. IBM has been pushing this, and there are RedHat and Ubuntu releases, targeting POWER8. (Which also means Ubuntu ships with cross compilers for it). I was thinking of doing a v1 port first then v2, partly as I have little endian only hardware (Apple G5 running Fedora; Fedora has recently dropped support though; ten years old but dual G5 is still decent hardware). However maybe I should just skip to v2; I do have access to hardware. In principal could then produce a bigendian Musl distro for G5... IBM have been spending a fair amount of time making sure software works with v2. Both have 16 byte long double oddness. Thoughts?
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