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Re: Porting DTrace to ARM
On Mon, Mar 10, 2014 at 5:04 PM, Ryota Ozaki <ozaki-r%netbsd.org@localhost>
> I've updated my patch.
> The patch now consists of a few files:
> $ diffstat dtrace-arm.patch
> external/cddl/osnet/dev/dtrace/arm/dtrace_asm.S | 13
> external/cddl/osnet/dev/dtrace/arm/dtrace_isa.c | 11
> external/cddl/osnet/dev/fbt/fbt.c | 576
> external/cddl/osnet/dist/uts/common/sys/dtrace.h | 14
> sys/arch/arm/arm/undefined.c | 49 +
> sys/arch/arm/include/trap.h | 8
> 6 files changed, 670 insertions(+), 4 deletions(-)
> undefined.c and trap.h are already reviewed by matt
> and may be ready to merge. (two global variables for
> dtrace/fbt modules has been added to undefined.c
> since then, although I think it's not a big deal.)
> Can I commit them? (or by matt is better?)
> dtrace.h just defines some variables and dtrace_asm.S
> just hooks up a callback for fbt, which are trivial.
> I think these files can be committed once other files
> are committed.
> fbt.c is the biggest change in this porting work. It explores
> probe points of functions in the kernel, replaces instructions
> of the probe points, and emulates the replaced instructions.
> I want someone to take a look at it before merging.
> The change of dtrace_isa.c is not big and important, but
> a bit dirty. It copies macros (yes, FR_* ones) from another
> place to make it buildable. I know the workaround is not
> awesome, but it makes dtrace work anyway.
> Any comments are welcome :-)
I will commit the patch during AsiaBSDCon 2014 if there is
no objection :)
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