a37d4032ed
Current code, which copies the potential syscall arguments into the current frame, puts an arbitrary limit on the number of syscall arguments. Apparently, mmap(2) and lseek(2) (?) require larger number. But there is an issue that stack is only need to be mapped to contain the number of arguments required by the syscall, so copying arbitrary large number of words from the stack is not completely safe. Use different approach to convert lcall frame into int $0x80 frame in place, by doing the retl in kernel. This also allows to stop proceed vfork case specially, and stop making assumptions about %cs at the syscall time. Also, improve comments with the formulations provided by bde. Reviewed and tested by: bde Sponsored by: The FreeBSD Foundation MFC after: 1 week
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