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
Some of these congates are cognate with only part of the word.
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As well as touring with the Paul Rogers-fronted Queen more recently, he became a permanent fixture in the West End with the Ben Elton musical We Will Rock You - which ran for over 10 years at the Dominion Theatre.
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But, like Ahmed, he would like more research to be done on the long-term effects.