Sonnet 4.5, Opus 4.5, Opus 4.6
The key is the test TST_SEL_RET on line 682. It compares the RPL of the return CS selector (saved on the stack by the original CALL) against the current CPL. If RPL == CPL, the PLA returns 0x000 (continue) and LD_DESCRIPTOR finishes normally -- same-privilege return. If RPL CPL, the caller is returning to a less-privileged ring, so the PLA redirects to 0x686 (RETF_OUTER_LEV) -- the cross-privilege path that must also restore the caller's stack. If RPL
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On the first loop iteration, there is no backing store for tasks, so
（三）非法进行影响国（边）界线走向的活动或者修建有碍国（边）境管理的设施的。