[lld] r262026 - Add comment on AMDGPU that the difference has no obvious reason.
Rui Ueyama via llvm-commits
llvm-commits at lists.llvm.org
Fri Feb 26 10:42:17 PST 2016
I don't know what the intention there, but at least the current output for
AMDGPU has a program header, which you can't get with -r. So, does that
On Fri, Feb 26, 2016 at 10:40 AM, Rafael Espíndola <
rafael.espindola at gmail.com> wrote:
> Hi Tom,
> As mentioned before, according to the ELF spec executable and shared
> object files *must* use virtual addresses, not offsets. This is simply
> not valid ELF and a very slippery slope I would much prefer lld and
> llvm to not be on. This has the potential of hitting far more places
> than the IsMips64EL issue.
> We are now adding support for -r, where it is correct (required) to
> use offsets. Could you please delete this code and just require that
> -r be used with the AMDGPU target?
> On 26 February 2016 at 10:39, Rui Ueyama via llvm-commits
> <llvm-commits at lists.llvm.org> wrote:
> > Author: ruiu
> > Date: Fri Feb 26 09:39:26 2016
> > New Revision: 262026
> > URL: http://llvm.org/viewvc/llvm-project?rev=262026&view=rev
> > Log:
> > Add comment on AMDGPU that the difference has no obvious reason.
> > Modified:
> > lld/trunk/ELF/OutputSections.cpp
> > lld/trunk/ELF/Symbols.cpp
> > Modified: lld/trunk/ELF/OutputSections.cpp
> > URL:
> > --- lld/trunk/ELF/OutputSections.cpp (original)
> > +++ lld/trunk/ELF/OutputSections.cpp Fri Feb 26 09:39:26 2016
> > @@ -1456,8 +1456,11 @@ void SymbolTableSection<ELFT>::writeLoca
> > const OutputSectionBase<ELFT> *OutSec = Section->OutSec;
> > ESym->st_shndx = OutSec->SectionIndex;
> > VA = Section->getOffset(*Sym);
> > - // Symbol offsets for AMDGPU need to be the offset in bytes of
> > - // symbol from the beginning of the section.
> > +
> > + // Symbol offsets for AMDGPU are the offsets in bytes of the
> > + // symbols from the beginning of the section. There seems to be
> > + // reason for that deviation -- it's just that the definition of
> > + // st_value field in AMDGPU's ELF is odd.
> > if (Config->EMachine != EM_AMDGPU)
> > VA += OutSec->getVA();
> > }
> > Modified: lld/trunk/ELF/Symbols.cpp
> > URL:
> > --- lld/trunk/ELF/Symbols.cpp (original)
> > +++ lld/trunk/ELF/Symbols.cpp Fri Feb 26 09:39:26 2016
> > @@ -44,10 +44,12 @@ typename ELFFile<ELFT>::uintX_t SymbolBo
> > return D->Sym.st_value;
> > assert(SC->Live);
> > - // Symbol offsets for AMDGPU need to be the offset in bytes of the
> > - // from the beginning of the section.
> > + // Symbol offsets for AMDGPU are the offsets in bytes of the symbols
> > + // from the beginning of the section. Note that this part of
> > + // ELF spec is odd and not in line with the standard ELF.
> > if (Config->EMachine == EM_AMDGPU)
> > return SC->getOffset(D->Sym);
> > +
> > if (D->Sym.getType() == STT_TLS)
> > return SC->OutSec->getVA() + SC->getOffset(D->Sym) -
> > Out<ELFT>::TlsPhdr->p_vaddr;
> > _______________________________________________
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> > llvm-commits at lists.llvm.org
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