llvm dev - Jul 2020 - llvm-objdump print file offset

Hello,

$ objdump -h # displays info about all below sections....
Sections:
Idx Name          Size      VMA               LMA               File off  Algn

While,
$ llvm-objdump -h # only displays subset of info...
Sections:
Idx Name          Size      Address          Type

Using '--show-lma' could get VMA and LMA details.

Can you suggest options to print 'File off' and 'Alng' with
llvm-objdump?

Thank you in advance.

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Hi,

This looks like a bug in llvm-objdump's output (I'd expect it to match
GNU's). There are no options to print the other columns. Could you file a
bug against llvm-objdump at https://bugs.llvm.org/, please?

You could also use llvm-readelf to get equivalent output. For a simple
object, it might look something like this:

C:\Work\TOOLCHAIN-5886> \llvm\build\Debug\bin\llvm-readelf.exe -S
C:\Work\TempWork\bar.o
There are 12 section headers, starting at offset 0x208:

Section Headers:
  [Nr] Name              Type            Address          Off    Size   ES
Flg Lk Inf Al
  [ 0]                   NULL            0000000000000000 000000 000000 00
     0   0  0
  [ 1] .strtab           STRTAB          0000000000000000 000198 000070 00
     0   0  1
 ...

It produces GNU readelf-style output, but this won't show you LMA output
(and there is no option to do so I'm afraid).

Hope that helps,

James

On Tue, 7 Jul 2020 at 18:22, Oza, Hiral via llvm-dev <
llvm-dev at lists.llvm.org> wrote:
> Hello,
>
>
>
> $ objdump -h # displays info about all below sections….
>
> Sections:
>
> Idx Name          Size      VMA               LMA               File off
> Algn
>
>
>
> While,
>
> $ llvm-objdump -h # only displays subset of info…
>
> Sections:
>
> Idx Name          Size      Address          Type
>
>
>
> Using ‘--show-lma' could get VMA and LMA details.
>
>
>
> Can you suggest options to print ‘File off’ and ‘Alng’ with llvm-objdump?
>
>
>
> Thank you in advance.
>
>
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
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Thanks James it seems worked for me :)
I am facing some issues in login into bugs.llvm.org, I will file once I get
access. Pls feel free if you have login :)

Thank you again.


From: James Henderson <jh7370.2008 at my.bristol.ac.uk>
Sent: Wednesday, July 8, 2020 1:58 PM
To: Oza, Hiral <Hiral.Oza at netapp.com>
Cc: llvm-dev at lists.llvm.org
Subject: Re: [llvm-dev] llvm-objdump print file offset

Hi,

This looks like a bug in llvm-objdump's output (I'd expect it to match
GNU's). There are no options to print the other columns. Could you file a
bug against llvm-objdump at https://bugs.llvm.org/, please?

You could also use llvm-readelf to get equivalent output. For a simple object,
it might look something like this:

C:\Work\TOOLCHAIN-5886> \llvm\build\Debug\bin\llvm-readelf.exe -S
C:\Work\TempWork\bar.o
There are 12 section headers, starting at offset 0x208:

Section Headers:
  [Nr] Name              Type            Address          Off    Size   ES Flg
Lk Inf Al
  [ 0]                   NULL            0000000000000000 000000 000000 00     
0   0  0
  [ 1] .strtab           STRTAB          0000000000000000 000198 000070 00     
0   0  1
 ...

It produces GNU readelf-style output, but this won't show you LMA output
(and there is no option to do so I'm afraid).

Hope that helps,

James

On Tue, 7 Jul 2020 at 18:22, Oza, Hiral via llvm-dev <llvm-dev at
lists.llvm.org<mailto:llvm-dev at lists.llvm.org>> wrote:
Hello,

$ objdump -h # displays info about all below sections….
Sections:
Idx Name          Size      VMA               LMA               File off  Algn

While,
$ llvm-objdump -h # only displays subset of info…
Sections:
Idx Name          Size      Address          Type

Using ‘--show-lma' could get VMA and LMA details.

Can you suggest options to print ‘File off’ and ‘Alng’ with llvm-objdump?

Thank you in advance.

_______________________________________________
LLVM Developers mailing list
llvm-dev at lists.llvm.org<mailto:llvm-dev at lists.llvm.org>
https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
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