This is the mail archive of the mailing list for the elfutils project.

Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]
Other format: [Raw text]

Re: elfutils/libdw ARM compilation (native and cross compile)

Hi Mark,

On 26 February 2014 00:26, Mark Wielaard <> wrote:
> Hi Jean,
> Seems you already got your answer to the build question solved.
Yes! There is quite a huge improvement in performance: >500% for dwarf
unwinding ;-p

> On Tue, 2014-02-25 at 18:17 +0100, Jean Pihet wrote:
>> The goal is to add the libdw support for perf on ARM (and later AARCH64).
> Note that there is some code in elfutils git that handles .debug_frame
> for ARM, but not yet code for handling EXIDX tables. For non-debug
> unwinding ARM uses EXIDX tables, not .eh_frames. Handling EXIDX tables
> is probably easiest done by translating them to CFI. In case you want to
> do unwinding using libdw without .debug_frame available.
That is good to know. Our use cases suppose we have the .debug_frame
section in the binaries by default and otherwise the frame pointer can
be used.

> For AARCH64 there is some code available on my branch:
> Which might or might not work. I need to get access again to a aarch64
> setup to do some more testing before moving this to master.
Great! AARCH64 is next on my plate, I surely will let you know the status.

Thx for you replies!

> Cheers,
> Mark

Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]