[LLVMdev] ARM Debug support patch

[Mike-1]

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. 

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
???). 

Do not hesitate to contact us directly by mail on this topic. 

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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