llvm dev - May 2016 - How to convert assembly code to executable

Hello All,

I have converted c program into assembly code for alpha target using
following commands

clang -emit-llvm matrix.c -c -o matrix.bc
llc -march=alpha matrix.bc -o matrix.s

Now how to convert matrix.s assembly file into executable file of alpha
target?

Any help is appreciated

Thanks in advance !!

Thanks,

Bala
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If you add "-filetype=obj" to your llc command, I'd expect you to
get an object file instead of assembly source.
After that you would need to run it through a linker for your alpha target.

(The last LLVM release with an Alpha target was 3.0, I guess you are using a
really old version of LLVM? Or maintaining it as an out-of-tree target?)
--paulr


From: llvm-dev [mailto:llvm-dev-bounces at lists.llvm.org] On Behalf Of
Balasaheb Dabhade via llvm-dev
Sent: Monday, May 02, 2016 7:27 AM
To: llvm-dev at lists.llvm.org
Subject: [llvm-dev] How to convert assembly code to executable

Hello All,


I have converted c program into assembly code for alpha target using following
commands

clang -emit-llvm matrix.c -c -o matrix.bc

llc -march=alpha matrix.bc -o matrix.s

Now how to convert matrix.s assembly file into executable file of alpha target?

Any help is appreciated

Thanks in advance !!

Thanks,

Bala




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Please make sure to "reply all" so the whole email conversation
appears on the list.

The [additional library locations] and [additional include location] specify
where your Alpha-target headers and libraries are. I can't help you find
those places; they don't come with clang/LLVM.  If you don't specify
them, you should also leave out the preceding –L and –I options.  In fact you
shouldn't need –I at all if you are compiling assembler source.
You can look at gcc documentation for help with these options if you are
unfamiliar with them; they work exactly the same way in clang.
Not sure where you got "-mllvm –Wall" that looks very odd and you
don't really need it.
I wouldn't bother with –g when trying to compile assembler source.
That leaves us with:

clang matrix.s –L. –Wl,pie –o matrix.out

Assuming you have an appropriate linker, that might be enough.  If your linker
can't handle Alpha objects, you will need to find one; I can't help you
there.
--paulr

From: Balasaheb Dabhade [mailto:dabhadebalasaheb at gmail.com]
Sent: Monday, May 02, 2016 10:27 AM
To: Robinson, Paul
Subject: Re: [llvm-dev] How to convert assembly code to executable

Thanks Paulr,

Yes, I am using old version of LLVM(2.8) for alpha target. I wanted to do some
analysis on assembly code and then generate executable from assembly code.

I was looking for exact command to generate executable for assembly code. I got
following commands from stackoverflow:

clang matrix.s -L [additional library locations] -mllvm -Wall -g -L. -Wl,-pie
-I. -I[additional include locations] -o [executable output]
but I am not sure what to put in place of library location, I tried following
command
(matrix.s is my assembly code file) :

#clang matrix.s -L -mllvm -Wall -g -L. -Wl,-pie -I. -I -o matrix.out

getting below error :
clang: error: no such file or directory: 'matrix.out'

Could you please let me know the exact commands to generate assembly code to
executable for alpha target which include linking as well?

Thanks,
Bala








On Mon, May 2, 2016 at 9:24 PM, Robinson, Paul <paul.robinson at
sony.com<mailto:paul.robinson at sony.com>> wrote:
If you add "-filetype=obj" to your llc command, I'd expect you to
get an object file instead of assembly source.
After that you would need to run it through a linker for your alpha target.

(The last LLVM release with an Alpha target was 3.0, I guess you are using a
really old version of LLVM? Or maintaining it as an out-of-tree target?)
--paulr


From: llvm-dev [mailto:llvm-dev-bounces at
lists.llvm.org<mailto:llvm-dev-bounces at lists.llvm.org>] On Behalf Of
Balasaheb Dabhade via llvm-dev
Sent: Monday, May 02, 2016 7:27 AM
To: llvm-dev at lists.llvm.org<mailto:llvm-dev at lists.llvm.org>
Subject: [llvm-dev] How to convert assembly code to executable

Hello All,


I have converted c program into assembly code for alpha target using following
commands

clang -emit-llvm matrix.c -c -o matrix.bc

llc -march=alpha matrix.bc -o matrix.s

Now how to convert matrix.s assembly file into executable file of alpha target?

Any help is appreciated

Thanks in advance !!

Thanks,

Bala





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Thanks a lot Paulr !!


On Mon, May 2, 2016 at 11:16 PM, Robinson, Paul <paul.robinson at
sony.com>
wrote:
> Please make sure to "reply all" so the whole email conversation
appears on
> the list.
>
>
>
> The [additional library locations] and [additional include location]
> specify where your Alpha-target headers and libraries are. I can't help
you
> find those places; they don't come with clang/LLVM.  If you don't
specify
> them, you should also leave out the preceding –L and –I options.  In fact
> you shouldn't need –I at all if you are compiling assembler source.
>
> You can look at gcc documentation for help with these options if you are
> unfamiliar with them; they work exactly the same way in clang.
>
> Not sure where you got "-mllvm –Wall" that looks very odd and you
don't
> really need it.
>
> I wouldn't bother with –g when trying to compile assembler source.
>
> That leaves us with:
>
>
>
> clang matrix.s –L. –Wl,pie –o matrix.out
>
>
>
> Assuming you have an appropriate linker, that might be enough.  If your
> linker can't handle Alpha objects, you will need to find one; I
can't help
> you there.
>
> --paulr
>
>
>
> *From:* Balasaheb Dabhade [mailto:dabhadebalasaheb at gmail.com]
> *Sent:* Monday, May 02, 2016 10:27 AM
> *To:* Robinson, Paul
> *Subject:* Re: [llvm-dev] How to convert assembly code to executable
>
>
>
> Thanks Paulr,
>
>
>
> Yes, I am using old version of LLVM(2.8) for alpha target. I wanted to do
> some analysis on assembly code and then generate executable
> from assembly code.
>
>
>
> I was looking for exact command to generate executable for assembly code.
> I got following commands from stackoverflow:
>
> clang matrix.s -L [additional library locations] -mllvm -Wall -g -L.
-Wl,-pie -I. -I[additional include locations] -o [executable output]
>
> but I am not sure what to put in place of library location, I tried
> following command
>
> (matrix.s is my assembly code file) :
>
>
>
> #clang matrix.s -L -mllvm -Wall -g -L. -Wl,-pie -I. -I -o matrix.out
>
>
>
> getting below error :
>
> clang: error: no such file or directory: 'matrix.out'
>
>
>
> Could you please let me know the exact commands to generate assembly code
> to executable for alpha target which include linking as well?
>
>
>
> Thanks,
>
> Bala
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
> On Mon, May 2, 2016 at 9:24 PM, Robinson, Paul <paul.robinson at
sony.com>
> wrote:
>
> If you add "-filetype=obj" to your llc command, I'd expect
you to get an
> object file instead of assembly source.
>
> After that you would need to run it through a linker for your alpha target.
>
>
>
> (The last LLVM release with an Alpha target was 3.0, I guess you are using
> a really old version of LLVM? Or maintaining it as an out-of-tree target?)
>
> --paulr
>
>
>
>
>
> *From:* llvm-dev [mailto:llvm-dev-bounces at lists.llvm.org] *On Behalf Of
*Balasaheb
> Dabhade via llvm-dev
> *Sent:* Monday, May 02, 2016 7:27 AM
> *To:* llvm-dev at lists.llvm.org
> *Subject:* [llvm-dev] How to convert assembly code to executable
>
>
>
> Hello All,
>
>
>
> I have converted c program into assembly code for alpha target using
> following commands
>
> clang -emit-llvm matrix.c -c -o matrix.bc
>
> llc -march=alpha matrix.bc -o matrix.s
>
> Now how to convert matrix.s assembly file into executable file of alpha
> target?
>
> Any help is appreciated
>
> Thanks in advance !!
>
> Thanks,
>
> Bala
>
>
>
>
>
>
>
>
>
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