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Fixed RuntimeDyldELF absolute relocations.

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If an ELF relocation is pointed at an absolute address, it will have a symbol ID of zero.
RuntimeDyldELF::processRelocationRef was not previously handling this case, and was instead trying to handle it as a section-relative fixup.

I think this is the right fix here, but my elf-fu is poor on some of the more exotic platforms, so I'd appreciate it if anyone with greater knowledge could verify this.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@188572 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Richard Mitton 2013-08-16 18:54:26 +00:00
parent 8ae1efeb07
commit b0f7929885
1 changed files with 11 additions and 1 deletions
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12
lib/ExecutionEngine/RuntimeDyld/RuntimeDyldELF.cpp
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@ -843,6 +843,13 @@ void RuntimeDyldELF::processRelocationRef(unsigned SectionID,
case SymbolRef::ST_Unknown: {
Value.SymbolName = TargetName.data();
Value.Addend = Addend;
// Absolute relocations will have a zero symbol ID (STN_UNDEF), which
// will manifest here as a NULL symbol name.
// We can set this as a valid (but empty) symbol name, and rely
// on addRelocationForSymbol to handle this.
if (!Value.SymbolName)
Value.SymbolName = "";
break;
}
default:
@ -1068,7 +1075,10 @@ void RuntimeDyldELF::processRelocationRef(unsigned SectionID,
RelocationEntry RE(SectionID, Offset, RelType, Value.Addend);
// Extra check to avoid relocation againt empty symbols (usually
// the R_PPC64_TOC).
if (Value.SymbolName && !TargetName.empty())
if (SymType != SymbolRef::ST_Unknown && TargetName.empty())
Value.SymbolName = NULL;
if (Value.SymbolName)
addRelocationForSymbol(RE, Value.SymbolName);
else
addRelocationForSection(RE, Value.SectionID);