to place a "full-size" computer like an S/370 in a central processing center to
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。业内人士推荐旺商聊官方下载作为进阶阅读
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15:51, 27 февраля 2026Ценности。关于这个话题，搜狗输入法2026提供了深入分析
V86 mode dedicates an entire processor mode to backward compatibility, using fixed descriptor access rights and IOPL-based trapping to run unmodified 8086 code under full protection.