Re: Objcopy seems to consider tbss part of PTLOAD

[Nick Clifton]

Hi Vijay,

  In the future, it helps if report bugs, or potential bugs,
  via the binutils bugzilla system.  This allows us to track
  bugs individually and also add comments in the code that
  refer back to the bug report.  https://sourceware.org/bugzilla/


> clang reprod.c -ffreestanding -c -o reprod.img

Which architecture is this for ?  Which versions of clang and
the binutils are you using ?

> ld.lld --defsym VMA_START=0xffffffff80100000 --defsym LMA_START=0x4800000 -T 
> l.ld reprod.img -o reprod.img
> objcopy --change-section-lma .*-0xffffffff80000000 reprod.img
> objcopy --adjust-start -0xffffffff80000000 reprod.img
> lld dosen't seem to consider tbss section to have proper lma
> of lld
>    TLS            0x0000000000002058 0xffffffff80100060 (vma) 
> 0xffffffff80100060 (lma)
>                   0x0000000000000000 0x0000000000000004  R      0x4
>     03     .tbss
> Ld Linker
>    TLS            0x0000000000100098 0xffffffff801000a0 (vma) 
> 0xffffffffc81000a0 (lma)
>                   0x0000000000000000 0x0000000000000004  R      0x4

I am sorry, but I did not understand what is wrong with the LMA.
Please could you explain some more.

Also, you say that objcopy does not consider the .tbss section
to be part of a PT_LOAD segment.  This is correct.  It is part
of a PT_TLS segment.  PT_TLS segments are considered to be
inherently loadable, so it is OK to use PT_TLS for thread local
data rather than PT_LOAD.

Cheers
  Nick