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
"With a test like this, success comes from what we learn, and today's flight will help us improve Starship's reliability."
，这一点在heLLoword翻译官方下载中也有详细论述
say DSD-1. I'm not sure if the name changed, if DSD-1 and DTD-1 were slightly，更多细节参见heLLoword翻译官方下载
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