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Harden userland syscall entry and switch_to_guest #853

@sangho2

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@sangho2

The LiteBox userland platforms can also encounter the issues in #842 and #844, where a malicious guest can tamper with rsp right before invoking syscall. This would make LiteBox syscall handlers and switch_to_guest misbehave. Note that this doesn't hurt the userland platform's security (because it is not our TCB), but we should fix it for stability.

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