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In order to make CloudABI work on ARMv6, start off by copying over the sysvec for ARM64 and adjust it to use 32-bit registers. Also add code for fetching arguments from the stack if needed, as there are fewer register than on ARM64. Also import the vDSO that is needed to invoke system calls. This vDSO uses the intra procedure call register (ip) to store the system call number. This is a bit simpler than what native FreeBSD does, as FreeBSD uses r7, while preserving the original r7 into ip. This sysvec seems to be complete enough to start CloudABI processes. These processes are capable of linking in the vDSO and are therefore capable of executing (most?) system calls successfully. Unfortunately, the biggest show stopper is still that TLS is completely broken: - The linker used by CloudABI, LLD, still has troubles with some of the relocations needed for TLS. See LLVM bug 30218 for more details. - Whereas FreeBSD uses the tpidruro register for TLS, for CloudABI I want to make use of tpidrurw, so that userspace can modify the base address directly. This is needed for efficient emulation. Unfortunately, this register doesn't seem to be preserved across context switches yet. Obtained from: https://github.com/NuxiNL/cloudabi (the vDSO)
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