x86 DR6 bits \ VOGONS

x86 DR6 bits

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First post, by superfury

Posted on 2025-10-27, 10:58

superfury Offline

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When exactly are DR6's bits set (or cleared for DR6/7's bit 13)? Before the exception vector is attempted or after it succeeds? What if it leads to another fault (not triple fault)? Are the bits still set if a general protection fault occurs while trying to parse #DB or #BP?

Last edited by superfury on 2025-10-27, 11:00. Edited 1 time in total.

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Reply 1 of 1, by reenigne

Posted on 2025-10-31, 12:29

reenigne Offline

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They are set before the exception vector is attempted. So yes, they can still be set if there's a fault when trying to enter the breakpoint exception.

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