Hello! This patchset contains public headers for AArch64 support in GNU Mach, along with just enough buildsystem infrastructure to recognize and install them. It is quite similar to the "sketch" patches that I have posted in January of this year, but I have done a number of changes for two reasons. One reason is me becoming a lot more familiar with ARM and AArch64, in particular having done a bunch of reading of the Arm ARM.
The other reason is there is now a real port of GNU Mach to AArch64, using these headers as its actual API/ABI. We got the Mach port to run glibc, several Hurd servers, and simple Unix programs, including things like fork/exec and signal delivery & handling working, which excersizes these architecture-specific definitions (thread state & exceptions). We have also managed to do some testing on real hardware; although not everything is working yet, we have seen thread state manipulation & Mach handling an unaligned SP fault work as expected. While the Mach port exists, I'm not proposing we merge it yet. This patch set only contains the headers, pulled from the AArch64 port branch. It is small enough, already in ready-to-be-merged state (as opposed to prototype/sketch state it was this January), and should be easy to review. At the same time, this should be enough to build glibc and most of the Hurd, and then the rest of the userland; this also means that merging this patchset should be enough to unblock merging the glibc port upstream, now that the GCC patches are in. Sergey
