layout.tsx # Root layout + metadata
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
，这一点在体育直播中也有详细论述
| | cTP SDK Probe |======= | StationData [N] |
2026-02-28 00:00:00:0本报记者 吴 君 花有品，城有格，湖北宜昌——