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Btw, I'm pushing what looks like the "final" version of sysenter/sysexit for now. There may be bugs left, but all the known issues are resolved: - single-stepping over the system call now works. It doesn't actually see all of the user-mode instructions, since the fast system call interface does not lend itself well to restoring "TF" in eflags on return, but the trampoline code saves and restores the flags, so you will be able to step over the important bits. (ptrace also doesn't actually allow you to look at the instruction contents in high memory, so gdb won't see the instructions in the user-mode fast system call trampoline even when it can single-step them, and I don't think I'll bother to fix it up). - NMI at the "wrong" time (just before first instruction in kernel space) should now be a non-issue. The per-CPU SEP stack looks like a real (nonpreemptable) process, and follows all the conventions needed for "current_thread_info()" and friends. This behaviour is also triggered by the single-step debug trap, so while I've obviously not tested NMI behaviour, I _have_ tested the very same concept at that exact point. - The APM problem was confirmed by Andrew to apparently be just a GDT that was too small for the new layout. This is in addition to the six-argument issues and the glibc address query issues that were resolved yesterday. Linus - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | |||||||||
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