On 20 Aug 2002, Luca Barbieri wrote:
> How about checking %cs in assembly and branching off for the kernel-mode
> case?
>
> Something like this:
> ENTRY(debug)
> testl $0x3, 4(%esp)
> jz handle_kernel_mode_debug
That's not correct, you can have the low bits of CS clear even from user
mode if the thing is in vm86 mode.
See the full test at the top of "ret_from_intr" (the "mix EFLAGS and CS"
thing - it's a bit funky).
Linus
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This archive was generated by hypermail 2b29 : Fri Aug 23 2002 - 22:00:21 EST