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[libos] Retain red zone area and FLAGS unmodified across syscall #355

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[libos] Retain red zone area and FLAGS unmodified across syscall #355

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Commits on Mar 24, 2023

  1. [libos] Retain red zone area and FLAGS unmodified across syscall 

    1. The previous implementation of __occlum_syret usse the red zone to
save the register temporarily, which may overwrite the red zone area.
This change avoids using the red zone when handling syscall.

2. Save and restore the FLAGS register before and after the operations
on PKRU to keep the FLAGS unmodified.
    @Bonjourz
    Bonjourz committed Mar 24, 2023
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