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Check that COFF .obj files have sections with zero virtual address spaces.

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When talking about the virtual address of sections the coff spec says:
  ... for simplicity, compilers should set this to zero. Otherwise, it is an
  arbitrary value that is subtracted from offsets during relocation.

We don't currently subtract it, so check that it is zero.

If some producer does create such files, we can change getRelocationOffset
instead.

llvm-svn: 241447
This commit is contained in:
Rafael Espindola 2015-07-06 14:26:07 +00:00
parent e9f414f573
commit 2c1a53aa22
4 changed files with 21 additions and 1 deletions
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2
lib/Object/COFFObjectFile.cpp
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@ -361,6 +361,8 @@ getFirstReloc(const coff_section *Sec, MemoryBufferRef M, const uint8_t *Base) {
relocation_iterator COFFObjectFile::section_rel_begin(DataRefImpl Ref) const {
const coff_section *Sec = toSec(Ref);
const coff_relocation *begin = getFirstReloc(Sec, Data, base());
if (begin && Sec->VirtualAddress != 0)
report_fatal_error("Sections with relocations should have an address of 0");
DataRefImpl Ret;
Ret.p = reinterpret_cast<uintptr_t>(begin);
return relocation_iterator(RelocationRef(Ret, this));

BIN
test/Object/Inputs/invalid-bad-section-address.coff Normal file
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13
test/Object/coff-invalid.test Normal file
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@ -0,0 +1,13 @@
RUN: llvm-readobj -s %p/Inputs/invalid-bad-section-address.coff 2>&1 | \
RUN: FileCheck --check-prefix=SECTIONS %s
SECTIONS: Section {
SECTIONS-NEXT: Number: 1
SECTIONS-NEXT: Name: .text (2E 74 65 78 74 00 00 00)
SECTIONS-NEXT: VirtualSize: 0x0
SECTIONS-NEXT: VirtualAddress: 0x1000000
RUN: not llvm-readobj -r %p/Inputs/invalid-bad-section-address.coff 2>&1 | \
RUN: FileCheck %s
CHECK: Sections with relocations should have an address of 0

7
tools/llvm-readobj/COFFDumper.cpp
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@ -48,7 +48,6 @@ public:
COFFDumper(const llvm::object::COFFObjectFile *Obj, StreamWriter& Writer)
: ObjDumper(Writer)
, Obj(Obj) {
cacheRelocations();
}
void printFileHeaders() override;
@ -92,6 +91,7 @@ private:
typedef DenseMap<const coff_section*, std::vector<RelocationRef> > RelocMapTy;
const llvm::object::COFFObjectFile *Obj;
bool RelocCached = false;
RelocMapTy RelocMap;
StringRef CVFileIndexToStringOffsetTable;
StringRef CVStringTable;
@ -119,6 +119,7 @@ std::error_code createCOFFDumper(const object::ObjectFile *Obj,
// symbol used for the relocation at the offset.
std::error_code COFFDumper::resolveSymbol(const coff_section *Section,
uint64_t Offset, SymbolRef &Sym) {
cacheRelocations();
const auto &Relocations = RelocMap[Section];
for (const auto &Relocation : Relocations) {
uint64_t RelocationOffset = Relocation.getOffset();
@ -339,6 +340,10 @@ static std::error_code getSymbolAuxData(const COFFObjectFile *Obj,
}
void COFFDumper::cacheRelocations() {
if (RelocCached)
return;
RelocCached = true;
for (const SectionRef &S : Obj->sections()) {
const coff_section *Section = Obj->getCOFFSection(S);