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add vsyscall emulation in page fault handler #92
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If we hit a PF for an address in the vsyscall page, allocate some memory in the process address space which will do `syscall;retq`, and depending on the offset into the vsyscall page set `RAX` to the desired syscall number. This does not implement a true fast path for syscalls, nor does it implement vDSO.
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If we hit a PF for an address in the vsyscall page, allocate some memory
in the process address space which will do
syscall;retq, and dependingon the offset into the vsyscall page set
RAXto the desired syscallnumber.
This does not implement a true fast path for syscalls, nor does it
implement vDSO.