llvm dev - Jun 2014 - [LLVMdev] Is there any tool can generate MIPS ELF file?

Hi Matheus,

   Thank you for your information! Do you known where do download MIPS
ABI/EABI document? Thanks in advance!

-- 
Best Regards,
Yu Rong Tan


On Thu, Jun 12, 2014 at 7:14 PM, Matheus Almeida
<Matheus.Almeida at imgtec.com> wrote:
> An assembler is the tool you're after. [And a linker if you want to
have an executable in the end].
>
> You can specify -filetype=obj to llc and you should get an object file.
Note that llvm-mc is not an end-user tool but it should do the job you have
asked as well i.e.,
>
> llvm-mc -arch=mips64 =mcpu=mips64 -filetype=obj test.s -o test.o (this
should generate test.o)
>
> Regards,
> Matheus
>
> -----Original Message-----
> From: llvmdev-bounces at cs.uiuc.edu [mailto:llvmdev-bounces at
cs.uiuc.edu] On Behalf Of Nancy
> Sent: 12 June 2014 11:24
> To: LLVM Developers Mailing List
> Subject: [LLVMdev] Is there any tool can generate MIPS ELF file?
>
> Hi,
>
> To my understanding, ll/bc can translate to any target machine code that
make cross-compiling easy.
>
> $llc -march=mipsel -mcpu=mips64 test.ll
> generate test.s(MIPS ASM)
>
> There must be a tool turns test.s to mips ELF file to make this whole thing
done completely. What is it?
>
>
> --
> Best Regards,
> Yu Rong Tan
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev

Could you be more specific about what ABIs are you after ? The reason I'm
asking is that there are several ABIs available for Mips and only a few of them
are supported by LLVM (o32, n32 and n64). There are several ABIs defined by GNU
with very little documentation that describes them (EABI is one example).

We are aware that the available documentation and GCC disagree sometimes and
given that GCC is the de-facto standard, LLVM tries to follow GCC's
behaviour as close as possible.

As far as I know there isn't any link from Imagination Technologies'
website that I can point you to w.r.t ABIs but there's documentation out
there like:
https://dmz-portal.mips.com/mw/images/f/fe/MD00305-2B-ABIDESC-SPC-01.03.pdf   //
This is probably the best document as it compares the 3 most important ABIs.
Note that it's an old document and needs some refactoring given that the
implementation in GCC sometimes differs from the documentation.
http://math-atlas.sourceforge.net/devel/assembly/mipsabi32.pdf // O32
ftp://www.linux-mips.org/pub/linux/mips/doc/ABI/MIPS-N32-ABI-Handbook.pdf //n32

Regards,
Matheus

-----Original Message-----
From: Nancy [mailto:nancydreaming at gmail.com] 
Sent: 14 June 2014 15:59
To: Matheus Almeida
Cc: LLVM Developers Mailing List
Subject: Re: [LLVMdev] Is there any tool can generate MIPS ELF file?

Hi Matheus,

   Thank you for your information! Do you known where do download MIPS ABI/EABI
document? Thanks in advance!

--
Best Regards,
Yu Rong Tan


On Thu, Jun 12, 2014 at 7:14 PM, Matheus Almeida
<Matheus.Almeida at imgtec.com> wrote:
> An assembler is the tool you're after. [And a linker if you want to
have an executable in the end].
>
> You can specify -filetype=obj to llc and you should get an object file.
Note that llvm-mc is not an end-user tool but it should do the job you have
asked as well i.e.,
>
> llvm-mc -arch=mips64 =mcpu=mips64 -filetype=obj test.s -o test.o (this
should generate test.o)
>
> Regards,
> Matheus
>
> -----Original Message-----
> From: llvmdev-bounces at cs.uiuc.edu [mailto:llvmdev-bounces at
cs.uiuc.edu] On Behalf Of Nancy
> Sent: 12 June 2014 11:24
> To: LLVM Developers Mailing List
> Subject: [LLVMdev] Is there any tool can generate MIPS ELF file?
>
> Hi,
>
> To my understanding, ll/bc can translate to any target machine code that
make cross-compiling easy.
>
> $llc -march=mipsel -mcpu=mips64 test.ll
> generate test.s(MIPS ASM)
>
> There must be a tool turns test.s to mips ELF file to make this whole thing
done completely. What is it?
>
>
> --
> Best Regards,
> Yu Rong Tan
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev

Thank you very much for your information and documents!

Why Imagination Technologies do not offer the latest MIPS ABI document
download link just like the ISA docs? If they thought no much people
interested in that doc, they had to make greate effort on compiler
like GCC,LLVM by themself,then why GCC disagree with some MIPS ABI, it
should be freely designed by MIPS ABI designer and compiler backend
target implementation. Do I miss something?

-- 
Best Regards,
Yu Rong Tan

On Mon, Jun 16, 2014 at 5:30 PM, Matheus Almeida
<Matheus.Almeida at imgtec.com> wrote:
> Could you be more specific about what ABIs are you after ? The reason
I'm asking is that there are several ABIs available for Mips and only a few
of them are supported by LLVM (o32, n32 and n64). There are several ABIs defined
by GNU with very little documentation that describes them (EABI is one example).
>
> We are aware that the available documentation and GCC disagree sometimes
and given that GCC is the de-facto standard, LLVM tries to follow GCC's
behaviour as close as possible.
>
> As far as I know there isn't any link from Imagination
Technologies' website that I can point you to w.r.t ABIs but there's
documentation out there like:
> https://dmz-portal.mips.com/mw/images/f/fe/MD00305-2B-ABIDESC-SPC-01.03.pdf
// This is probably the best document as it compares the 3 most important ABIs.
Note that it's an old document and needs some refactoring given that the
implementation in GCC sometimes differs from the documentation.
> http://math-atlas.sourceforge.net/devel/assembly/mipsabi32.pdf // O32
> ftp://www.linux-mips.org/pub/linux/mips/doc/ABI/MIPS-N32-ABI-Handbook.pdf
//n32
>
> Regards,
> Matheus
>