Messages in this thread | | | Date | Tue, 16 Nov 1999 00:47:27 +0100 | From | Andi Kleen <> | Subject | Re: year old problem |
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On Mon, Nov 15, 1999 at 11:36:31PM +0100, Eric Pouech wrote: > well, it seems to me that the code in __switch_to (loaddebug macro) *restores* > the DBi registers (from the tss in memory to the i386) while switching to 'next' > process > > my issue is that the i386 value of DR6 (status => which debug registers > which (may) have triggered a trap) are never (I should say no longer) > stored in tss as they used to be (and therefore never accessible with ptrace) > > in 2.0.x series, they were stored in tss while entering the TRAP handler > and it's no longer the case.
Point taken. It seems to be a bug. For DR0-DR3/DR7 it doesn't make sense to save them all the time (because they can be set by ptrace, even by the program), but DR4-6 should be saved.
-Andi
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