Re: [uml-devel] Patchset to implement PTRACE_SYSEMU_SINGLESTEP

[Blaisorblade <blaisorblade_spam@yahoo.it>]

On Friday 12 November 2004 21:05, Bodo Stroesser wrote:
> Attached are several patches. Four of them (patch-2.6.*-skas-v7-*)
> implement PTRACE_SYSEMU_SINGLESTEP in the host. They are based on
> linux-2.6.7-vanilla + host-skas3-2.6.7-v7.patch (resp. the 2.6.9 versions).
> The "-reorganize" patches are a rework of the current patch without
> changing the functionality. The "add-SYSEMU_SINGLESTEP" then implement the
> new features. Please note: the differences between 2.6.7 and 2.6.9 are
> dependent on the different handling of syscall singlestepping in the two
> versions.

> To have UML using the new feature, there are two further patches named
> patch-SYSEMU_SINGLESTEP-*. They are based on linux-2.6.9-vanilla +
> all bb2-patches + patch-sysemu-tt + patch-fix-uml-hang-on-2.6.9-host.
> To have all the patches complete, the latter two are attached also.

> I tested on host 2.6.7 and host 2.6.9 with SKAS and TT mode. Currently I
> don't know any problem with it.
I have a problem... in recent host kernels, isn't SINGLESTEP also trapping for 
syscall instructions?

Also, you say that SINGLESTEP_SYSEMU does automatic syscall overwriting with 
-1 or emulates that - I suspect it being in the reorganize patches, but you 
don't mention it in the changelogs here, only about the UML patches.

So, I'd personally accept only the -reorganize ones and hold on the rest - 
which is probably achieved with mainline SINGLESTEP fixes in 2.6.9 (or which 
could be discussed).

Sorry for being so late (I'd say "Call me a lamer" :-) ) in discussing this, 
but I hadn't the time to study patches and realize this.
> Bodo

-- 
Paolo Giarrusso, aka Blaisorblade
Linux registered user n. 292729
http://www.user-mode-linux.org/~blaisorblade


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