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linux-user: add option to intercept execve() syscalls
In order for one to use QEMU user mode emulation under a chroot, it is required to use binfmt_misc. This can be avoided by QEMU never doing a raw execve() to the host system. Introduce a new option, -execve, that uses the current QEMU interpreter to intercept execve(). qemu_execve() will prepend the interpreter path , similar to what binfmt_misc would do, and then pass the modified execve() to the host. It is necessary to parse hashbang scripts in that function otherwise the kernel will try to run the interpreter of a script without QEMU and get an invalid exec format error. Signed-off-by: Petros Angelatos <petrosagg@resin.io>
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