[LLVMdev] ARM Debug support patch
Mike-1
mike at flexycore.com
Fri Dec 12 13:07:50 PST 2008
Hi Evans,
Currently, we have not test all debug functionnalities, this will be done
with the progress of our project.
Could you explain more in details (by mail if possible) what is the problem
with aggregates and debugging ?
Could you also provide C program or llvm source file that exposes this
problem in order to see what we can do?
During our roadmap progress, FlexyCore will not hesitate to send patches if
needed.
Mikaël.
Evan Cheng wrote:
>
>
> On Dec 11, 2008, at 8:23 AM, Mike-1 wrote:
>
>>
>> Thanks for the commit.
>>
>> FlexyCore works only on ARM EABI Linux target for now. This binary
>> with
>> Dwarf information could be debugged with a gdb-server 6.8 without
>> problem on
>> our side.
>
> Good to hear. Are you able to examine aggregates?
>
>>
>>
>> If you are working on ARM Linux target, could you send us LLVM
>> source file,
>> and gdb version ? But if you are using ARM Darwin as Anton suggest,
>> we are
>> unable to test this for now.
>>
>> We are open to help on this target, but we need some help to
>> efficiently
>> setup the right Darwin platform (pre-compile binary platform, qemu,
>> boards
>> ???).
>
> I am not sure how to build llvm-gcc with Mac OS X / arm support using
> the open sourced llvm-gcc tree. It would be nice if someone can figure
> that out and post instructions. I would very like to see qemu support
> as well. I know Greg is also interested in this. Greg, any ideas?
>
>>
>>
>> Do not hesitate to contact us directly by mail on this topic.
>
> Thanks,
>
> Evan
>
>>
>>
>> Thanks,
>>
>> Mike.
>>
>>
>> Evan Cheng wrote:
>>>
>>> I've committed the patch with some fixes. It allows ARM target to
>>> generate Dwarf information. However, I did not have much luck
>>> debugging llvm produced executables. I would appreciate it very much
>>> if you can put the debug support to test and contribute more patches.
>>>
>>> Thanks,
>>>
>>> Evan
>>>
>>> On Dec 10, 2008, at 8:38 AM, Mike-1 wrote:
>>>
>>>>
>>>> Hi all,
>>>>
>>>> FlexyCore, the company I am working for, use LLVM to generate binary
>>>> for ARM
>>>> platform. We are very fulfilled with LLVM, and FlexyCore will be
>>>> pleased to
>>>> contribute on this software.
>>>>
>>>>
>>>> We need debug support in ARM binary, but, in LLVM 2.4, this support
>>>> is not
>>>> activated for ARM backend. Consequently, I made small modifications
>>>> in order
>>>> to activate it (see the patch in attach file). My experience is not
>>>> enough
>>>> on LLVM to know if it is the right way to solve the problem. But
>>>> these
>>>> modifications work on our use cases.
>>>>
>>>>
>>>>
>>>> Could you help us in order to check if these modifications are
>>>> corrects or
>>>> not ? If it is not the right way, could you explain us how to solve
>>>> this
>>>> problem in the correct way, and we will be pleased to re-submit
>>>> patch on
>>>> this issue.
>>>>
>>>> I also use 'make check' command in order to verify that
>>>> modifications does
>>>> not generate regressions.
>>>> Results are:
>>>>
>>>> * Without ARM debug support
>>>> === Summary ===
>>>> # of expected passes 2726
>>>> # of unexpected failures 58
>>>> # of expected failures 6
>>>> * With ARM debug support
>>>> === Summary ===
>>>> # of expected passes 2727
>>>> # of unexpected failures 57
>>>> # of expected failures 6
>>>>
>>>> The extra success test is funccall.ll from test/DebugInfo. In order
>>>> to build
>>>> successfully LLVM on ARM Linux EABI platform, I put in comment the
>>>> usage of
>>>> __register_frame into JIT.cpp because it seems that __register_frame
>>>> function is not into my libgcc. Could you mention which tools and
>>>> versions
>>>> that must to be used in order to build LLVM on ARM Linux EABI
>>>> platform.
>>>>
>>>> Thanks,
>>>>
>>>> Mikaël.
>>>>
>>>> http://www.nabble.com/file/p20938563/arm-debug-from-llvm2-4.patch
>>>> arm-debug-from-llvm2-4.patch
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>>>>
>>>>
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>>>
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>>
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