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[lld-macho] Add 32-bit compact unwind support
This could probably have been part of D99633, but I split it up to make things a bit more reviewable. I also fixed some bugs in the implementation that were masked through integer underflows when operating in 64-bit mode. Reviewed By: #lld-macho, gkm Differential Revision: https://reviews.llvm.org/D99823
This commit is contained in:
Jez Ng
parent
3bc88eb392
commit
1460942c15
@ -12,6 +12,7 @@
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#include "llvm/ADT/BitmaskEnum.h"
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#include "llvm/ADT/PointerUnion.h"
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#include "llvm/BinaryFormat/MachO.h"
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#include "llvm/Support/Endian.h"
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#include <cstddef>
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#include <cstdint>
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@ -93,6 +94,19 @@ inline void checkUInt(Diagnostic d, uint64_t v, int bits) {
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reportRangeError(d, llvm::Twine(v), bits, 0, llvm::maxUIntN(bits));
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}
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inline void writeAddress(uint8_t *loc, uint64_t addr, uint8_t length) {
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switch (length) {
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case 2:
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llvm::support::endian::write32le(loc, addr);
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break;
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case 3:
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llvm::support::endian::write64le(loc, addr);
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break;
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default:
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llvm_unreachable("invalid r_length");
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}
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}
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extern const RelocAttrs invalidRelocAttrs;
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} // namespace macho
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@ -32,6 +32,7 @@ class Defined;
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class DylibSymbol;
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class LoadCommand;
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class ObjFile;
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class UnwindInfoSection;
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class SyntheticSection : public OutputSection {
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public:
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@ -503,6 +504,7 @@ struct InStruct {
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StubsSection *stubs = nullptr;
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StubHelperSection *stubHelper = nullptr;
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ImageLoaderCacheSection *imageLoaderCache = nullptr;
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UnwindInfoSection *unwindInfo = nullptr;
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};
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extern InStruct in;
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@ -91,31 +91,62 @@ using namespace lld::macho;
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// TODO(gkm): prune __eh_frame entries superseded by __unwind_info
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// TODO(gkm): how do we align the 2nd-level pages?
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UnwindInfoSection::UnwindInfoSection()
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: SyntheticSection(segment_names::text, section_names::unwindInfo) {
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align = 4; // mimic ld64
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}
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using EncodingMap = llvm::DenseMap<compact_unwind_encoding_t, size_t>;
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bool UnwindInfoSection::isNeeded() const {
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return (compactUnwindSection != nullptr);
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}
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template <class Ptr> struct CompactUnwindEntry {
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Ptr functionAddress;
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uint32_t functionLength;
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compact_unwind_encoding_t encoding;
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Ptr personality;
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Ptr lsda;
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};
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SmallDenseMap<std::pair<InputSection *, uint64_t /* addend */>, Symbol *>
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personalityTable;
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struct SecondLevelPage {
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uint32_t kind;
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size_t entryIndex;
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size_t entryCount;
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size_t byteCount;
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std::vector<compact_unwind_encoding_t> localEncodings;
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EncodingMap localEncodingIndexes;
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};
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template <class Ptr> class UnwindInfoSectionImpl : public UnwindInfoSection {
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public:
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void prepareRelocations(InputSection *) override;
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void finalize() override;
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void writeTo(uint8_t *buf) const override;
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private:
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std::vector<std::pair<compact_unwind_encoding_t, size_t>> commonEncodings;
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EncodingMap commonEncodingIndexes;
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// Indices of personality functions within the GOT.
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std::vector<uint32_t> personalities;
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SmallDenseMap<std::pair<InputSection *, uint64_t /* addend */>, Symbol *>
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personalityTable;
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std::vector<unwind_info_section_header_lsda_index_entry> lsdaEntries;
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// Map of function offset (from the image base) to an index within the LSDA
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// array.
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llvm::DenseMap<uint32_t, uint32_t> functionToLsdaIndex;
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std::vector<CompactUnwindEntry<Ptr>> cuVector;
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std::vector<CompactUnwindEntry<Ptr> *> cuPtrVector;
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std::vector<SecondLevelPage> secondLevelPages;
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uint64_t level2PagesOffset = 0;
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};
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// Compact unwind relocations have different semantics, so we handle them in a
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// separate code path from regular relocations. First, we do not wish to add
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// rebase opcodes for __LD,__compact_unwind, because that section doesn't
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// actually end up in the final binary. Second, personality pointers always
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// reside in the GOT and must be treated specially.
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void macho::prepareCompactUnwind(InputSection *isec) {
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template <class Ptr>
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void UnwindInfoSectionImpl<Ptr>::prepareRelocations(InputSection *isec) {
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assert(isec->segname == segment_names::ld &&
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isec->name == section_names::compactUnwind);
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for (Reloc &r : isec->relocs) {
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assert(target->hasAttr(r.type, RelocAttrBits::UNSIGNED));
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if (r.offset % sizeof(CompactUnwindEntry64) !=
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offsetof(struct CompactUnwindEntry64, personality))
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if (r.offset % sizeof(CompactUnwindEntry<Ptr>) !=
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offsetof(CompactUnwindEntry<Ptr>, personality))
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continue;
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if (auto *s = r.referent.dyn_cast<Symbol *>()) {
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@ -172,8 +203,10 @@ static void checkTextSegment(InputSection *isec) {
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// before converting it to post-link form. There should only be absolute
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// relocations here: since we are not emitting the pre-link CU section, there
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// is no source address to make a relative location meaningful.
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static void relocateCompactUnwind(MergedOutputSection *compactUnwindSection,
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std::vector<CompactUnwindEntry64> &cuVector) {
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template <class Ptr>
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static void
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relocateCompactUnwind(MergedOutputSection *compactUnwindSection,
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std::vector<CompactUnwindEntry<Ptr>> &cuVector) {
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for (const InputSection *isec : compactUnwindSection->inputs) {
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uint8_t *buf =
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reinterpret_cast<uint8_t *>(cuVector.data()) + isec->outSecFileOff;
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@ -195,21 +228,23 @@ static void relocateCompactUnwind(MergedOutputSection *compactUnwindSection,
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checkTextSegment(referentIsec);
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referentVA = referentIsec->getVA() + r.addend;
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}
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support::endian::write64le(buf + r.offset, referentVA);
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writeAddress(buf + r.offset, referentVA, r.length);
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}
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}
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}
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// There should only be a handful of unique personality pointers, so we can
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// encode them as 2-bit indices into a small array.
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void encodePersonalities(const std::vector<CompactUnwindEntry64 *> &cuPtrVector,
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std::vector<uint32_t> &personalities) {
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for (CompactUnwindEntry64 *cu : cuPtrVector) {
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template <class Ptr>
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void encodePersonalities(
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const std::vector<CompactUnwindEntry<Ptr> *> &cuPtrVector,
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std::vector<uint32_t> &personalities) {
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for (CompactUnwindEntry<Ptr> *cu : cuPtrVector) {
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if (cu->personality == 0)
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continue;
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uint32_t personalityOffset = cu->personality - in.header->addr;
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// Linear search is fast enough for a small array.
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auto it = find(personalities, personalityOffset);
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auto it = find(personalities, cu->personality);
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uint32_t personalityIndex; // 1-based index
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if (it != personalities.end()) {
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personalityIndex = std::distance(personalities.begin(), it) + 1;
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@ -228,7 +263,7 @@ void encodePersonalities(const std::vector<CompactUnwindEntry64 *> &cuPtrVector,
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// Scan the __LD,__compact_unwind entries and compute the space needs of
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// __TEXT,__unwind_info and __TEXT,__eh_frame
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void UnwindInfoSection::finalize() {
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template <class Ptr> void UnwindInfoSectionImpl<Ptr>::finalize() {
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if (compactUnwindSection == nullptr)
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return;
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@ -240,21 +275,23 @@ void UnwindInfoSection::finalize() {
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// encoding+personality+lsda. Folding is necessary because it reduces
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// the number of CU entries by as much as 3 orders of magnitude!
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compactUnwindSection->finalize();
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assert(compactUnwindSection->getSize() % sizeof(CompactUnwindEntry64) == 0);
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assert(compactUnwindSection->getSize() % sizeof(CompactUnwindEntry<Ptr>) ==
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0);
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size_t cuCount =
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compactUnwindSection->getSize() / sizeof(CompactUnwindEntry64);
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compactUnwindSection->getSize() / sizeof(CompactUnwindEntry<Ptr>);
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cuVector.resize(cuCount);
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relocateCompactUnwind(compactUnwindSection, cuVector);
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// Rather than sort & fold the 32-byte entries directly, we create a
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// vector of pointers to entries and sort & fold that instead.
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cuPtrVector.reserve(cuCount);
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for (CompactUnwindEntry64 &cuEntry : cuVector)
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for (CompactUnwindEntry<Ptr> &cuEntry : cuVector)
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cuPtrVector.emplace_back(&cuEntry);
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std::sort(cuPtrVector.begin(), cuPtrVector.end(),
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[](const CompactUnwindEntry64 *a, const CompactUnwindEntry64 *b) {
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return a->functionAddress < b->functionAddress;
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});
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std::sort(
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cuPtrVector.begin(), cuPtrVector.end(),
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[](const CompactUnwindEntry<Ptr> *a, const CompactUnwindEntry<Ptr> *b) {
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return a->functionAddress < b->functionAddress;
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});
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// Fold adjacent entries with matching encoding+personality+lsda
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// We use three iterators on the same cuPtrVector to fold in-situ:
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@ -280,7 +317,7 @@ void UnwindInfoSection::finalize() {
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// Count frequencies of the folded encodings
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EncodingMap encodingFrequencies;
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for (const CompactUnwindEntry64 *cuPtrEntry : cuPtrVector)
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for (const CompactUnwindEntry<Ptr> *cuPtrEntry : cuPtrVector)
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encodingFrequencies[cuPtrEntry->encoding]++;
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// Make a vector of encodings, sorted by descending frequency
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@ -316,7 +353,7 @@ void UnwindInfoSection::finalize() {
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// If more entries fit in the regular format, we use that.
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for (size_t i = 0; i < cuPtrVector.size();) {
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secondLevelPages.emplace_back();
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UnwindInfoSection::SecondLevelPage &page = secondLevelPages.back();
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SecondLevelPage &page = secondLevelPages.back();
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page.entryIndex = i;
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uintptr_t functionAddressMax =
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cuPtrVector[i]->functionAddress + COMPRESSED_ENTRY_FUNC_OFFSET_MASK;
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@ -326,7 +363,7 @@ void UnwindInfoSection::finalize() {
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sizeof(unwind_info_compressed_second_level_page_header) /
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sizeof(uint32_t);
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while (wordsRemaining >= 1 && i < cuPtrVector.size()) {
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const CompactUnwindEntry64 *cuPtr = cuPtrVector[i];
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const CompactUnwindEntry<Ptr> *cuPtr = cuPtrVector[i];
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if (cuPtr->functionAddress >= functionAddressMax) {
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break;
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} else if (commonEncodingIndexes.count(cuPtr->encoding) ||
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@ -359,7 +396,7 @@ void UnwindInfoSection::finalize() {
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}
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}
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for (const CompactUnwindEntry64 *cu : cuPtrVector) {
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for (const CompactUnwindEntry<Ptr> *cu : cuPtrVector) {
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uint32_t functionOffset = cu->functionAddress - in.header->addr;
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functionToLsdaIndex[functionOffset] = lsdaEntries.size();
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if (cu->lsda != 0)
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@ -382,7 +419,8 @@ void UnwindInfoSection::finalize() {
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// All inputs are relocated and output addresses are known, so write!
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void UnwindInfoSection::writeTo(uint8_t *buf) const {
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template <class Ptr>
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void UnwindInfoSectionImpl<Ptr>::writeTo(uint8_t *buf) const {
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// section header
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auto *uip = reinterpret_cast<unwind_info_section_header *>(buf);
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uip->version = 1;
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@ -403,7 +441,8 @@ void UnwindInfoSection::writeTo(uint8_t *buf) const {
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// Personalities
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for (const uint32_t &personality : personalities)
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*i32p++ = in.got->addr + (personality - 1) * target->wordSize;
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*i32p++ =
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in.got->addr + (personality - 1) * target->wordSize - in.header->addr;
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// Level-1 index
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uint32_t lsdaOffset =
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@ -422,7 +461,7 @@ void UnwindInfoSection::writeTo(uint8_t *buf) const {
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l2PagesOffset += SECOND_LEVEL_PAGE_BYTES;
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}
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// Level-1 sentinel
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const CompactUnwindEntry64 &cuEnd = cuVector.back();
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const CompactUnwindEntry<Ptr> &cuEnd = cuVector.back();
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iep->functionOffset = cuEnd.functionAddress + cuEnd.functionLength;
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iep->secondLevelPagesSectionOffset = 0;
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iep->lsdaIndexArraySectionOffset =
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@ -455,7 +494,7 @@ void UnwindInfoSection::writeTo(uint8_t *buf) const {
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p2p->encodingsCount = page.localEncodings.size();
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auto *ep = reinterpret_cast<uint32_t *>(&p2p[1]);
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for (size_t i = 0; i < page.entryCount; i++) {
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const CompactUnwindEntry64 *cuep = cuPtrVector[page.entryIndex + i];
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const CompactUnwindEntry<Ptr> *cuep = cuPtrVector[page.entryIndex + i];
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auto it = commonEncodingIndexes.find(cuep->encoding);
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if (it == commonEncodingIndexes.end())
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it = page.localEncodingIndexes.find(cuep->encoding);
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@ -474,7 +513,7 @@ void UnwindInfoSection::writeTo(uint8_t *buf) const {
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p2p->entryCount = page.entryCount;
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auto *ep = reinterpret_cast<uint32_t *>(&p2p[1]);
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for (size_t i = 0; i < page.entryCount; i++) {
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const CompactUnwindEntry64 *cuep = cuPtrVector[page.entryIndex + i];
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const CompactUnwindEntry<Ptr> *cuep = cuPtrVector[page.entryIndex + i];
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*ep++ = cuep->functionAddress;
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*ep++ = cuep->encoding;
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}
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@ -482,3 +521,10 @@ void UnwindInfoSection::writeTo(uint8_t *buf) const {
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pp += SECOND_LEVEL_PAGE_WORDS;
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}
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}
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UnwindInfoSection *macho::makeUnwindInfoSection() {
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if (target->wordSize == 8)
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return make<UnwindInfoSectionImpl<uint64_t>>();
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else
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return make<UnwindInfoSectionImpl<uint32_t>>();
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}
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@ -17,66 +17,30 @@
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#include <vector>
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// In 2020, we mostly care about 64-bit targets: x86_64 and arm64
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struct CompactUnwindEntry64 {
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uint64_t functionAddress;
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uint32_t functionLength;
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compact_unwind_encoding_t encoding;
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uint64_t personality;
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uint64_t lsda;
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};
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// FIXME(gkm): someday we might care about 32-bit targets: x86 & arm
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struct CompactUnwindEntry32 {
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uint32_t functionAddress;
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uint32_t functionLength;
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compact_unwind_encoding_t encoding;
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uint32_t personality;
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uint32_t lsda;
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};
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namespace lld {
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namespace macho {
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class UnwindInfoSection : public SyntheticSection {
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public:
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UnwindInfoSection();
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bool isNeeded() const override { return compactUnwindSection != nullptr; }
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uint64_t getSize() const override { return unwindInfoSize; }
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bool isNeeded() const override;
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void finalize() override;
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void writeTo(uint8_t *buf) const override;
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virtual void prepareRelocations(InputSection *) = 0;
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void setCompactUnwindSection(MergedOutputSection *cuSection) {
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compactUnwindSection = cuSection;
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}
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using EncodingMap = llvm::DenseMap<compact_unwind_encoding_t, size_t>;
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protected:
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UnwindInfoSection()
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: SyntheticSection(segment_names::text, section_names::unwindInfo) {
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align = 4;
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}
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struct SecondLevelPage {
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uint32_t kind;
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size_t entryIndex;
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size_t entryCount;
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size_t byteCount;
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std::vector<compact_unwind_encoding_t> localEncodings;
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EncodingMap localEncodingIndexes;
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};
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private:
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std::vector<std::pair<compact_unwind_encoding_t, size_t>> commonEncodings;
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EncodingMap commonEncodingIndexes;
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// Indices of personality functions within the GOT.
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std::vector<uint32_t> personalities;
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std::vector<unwind_info_section_header_lsda_index_entry> lsdaEntries;
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// Map of function offset (from the image base) to an index within the LSDA
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// array.
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llvm::DenseMap<uint32_t, uint32_t> functionToLsdaIndex;
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std::vector<CompactUnwindEntry64> cuVector;
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std::vector<CompactUnwindEntry64 *> cuPtrVector;
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std::vector<SecondLevelPage> secondLevelPages;
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MergedOutputSection *compactUnwindSection = nullptr;
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uint64_t level2PagesOffset = 0;
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uint64_t unwindInfoSize = 0;
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};
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UnwindInfoSection *makeUnwindInfoSection();
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void prepareCompactUnwind(InputSection *isec);
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} // namespace macho
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@ -71,7 +71,6 @@ public:
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SymtabSection *symtabSection = nullptr;
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IndirectSymtabSection *indirectSymtabSection = nullptr;
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CodeSignatureSection *codeSignatureSection = nullptr;
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UnwindInfoSection *unwindInfoSection = nullptr;
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FunctionStartsSection *functionStartsSection = nullptr;
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LCUuid *uuidCommand = nullptr;
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@ -517,7 +516,7 @@ void Writer::scanRelocations() {
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TimeTraceScope timeScope("Scan relocations");
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for (InputSection *isec : inputSections) {
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if (isec->segname == segment_names::ld) {
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prepareCompactUnwind(isec);
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in.unwindInfo->prepareRelocations(isec);
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continue;
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}
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@ -798,7 +797,6 @@ template <class LP> void Writer::createOutputSections() {
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TimeTraceScope timeScope("Create output sections");
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// First, create hidden sections
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stringTableSection = make<StringTableSection>();
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unwindInfoSection = make<UnwindInfoSection>(); // TODO(gkm): only when no -r
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symtabSection = makeSymtabSection<LP>(*stringTableSection);
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indirectSymtabSection = make<IndirectSymtabSection>();
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if (config->adhocCodesign)
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@ -830,9 +828,9 @@ template <class LP> void Writer::createOutputSections() {
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for (const auto &it : mergedOutputSections) {
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StringRef segname = it.first.first;
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MergedOutputSection *osec = it.second;
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if (unwindInfoSection && segname == segment_names::ld) {
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if (segname == segment_names::ld) {
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assert(osec->name == section_names::compactUnwind);
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unwindInfoSection->setCompactUnwindSection(osec);
|
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in.unwindInfo->setCompactUnwindSection(osec);
|
||||
} else {
|
||||
getOrCreateOutputSegment(segname)->addOutputSection(osec);
|
||||
}
|
||||
@ -993,6 +991,7 @@ template <class LP> void macho::createSyntheticSections() {
|
||||
in.stubs = make<StubsSection>();
|
||||
in.stubHelper = make<StubHelperSection>();
|
||||
in.imageLoaderCache = make<ImageLoaderCacheSection>();
|
||||
in.unwindInfo = makeUnwindInfoSection();
|
||||
}
|
||||
|
||||
OutputSection *macho::firstTLVDataSection = nullptr;
|
||||
|
||||
@ -3,16 +3,23 @@
|
||||
# RUN: llvm-mc -filetype=obj -triple=x86_64-apple-darwin19.0.0 %t/my-personality.s -o %t/x86_64-my-personality.o
|
||||
# RUN: llvm-mc -filetype=obj -triple=x86_64-apple-darwin19.0.0 %t/main.s -o %t/x86_64-main.o
|
||||
# RUN: %lld -arch x86_64 -pie -lSystem -lc++ %t/x86_64-my-personality.o %t/x86_64-main.o -o %t/x86_64-personality-first
|
||||
# RUN: llvm-objdump --macho --unwind-info --syms --indirect-symbols --rebase %t/x86_64-personality-first | FileCheck %s --check-prefixes=FIRST,CHECK
|
||||
# RUN: llvm-objdump --macho --unwind-info --syms --indirect-symbols --rebase %t/x86_64-personality-first | FileCheck %s --check-prefixes=FIRST,CHECK -D#%x,BASE=0x100000000
|
||||
# RUN: %lld -arch x86_64 -pie -lSystem -lc++ %t/x86_64-main.o %t/x86_64-my-personality.o -o %t/x86_64-personality-second
|
||||
# RUN: llvm-objdump --macho --unwind-info --syms --indirect-symbols --rebase %t/x86_64-personality-second | FileCheck %s --check-prefixes=SECOND,CHECK
|
||||
# RUN: llvm-objdump --macho --unwind-info --syms --indirect-symbols --rebase %t/x86_64-personality-second | FileCheck %s --check-prefixes=SECOND,CHECK -D#%x,BASE=0x100000000
|
||||
|
||||
# RUN: llvm-mc -filetype=obj -triple=arm64-apple-darwin19.0.0 %t/my-personality.s -o %t/arm64-my-personality.o
|
||||
# RUN: llvm-mc -filetype=obj -triple=arm64-apple-darwin19.0.0 %t/main.s -o %t/arm64-main.o
|
||||
# RUN: %lld -arch arm64 -pie -lSystem -lc++ %t/arm64-my-personality.o %t/arm64-main.o -o %t/arm64-personality-first
|
||||
# RUN: llvm-objdump --macho --unwind-info --syms --indirect-symbols --rebase %t/arm64-personality-first | FileCheck %s --check-prefixes=FIRST,CHECK
|
||||
# RUN: llvm-objdump --macho --unwind-info --syms --indirect-symbols --rebase %t/arm64-personality-first | FileCheck %s --check-prefixes=FIRST,CHECK -D#%x,BASE=0x100000000
|
||||
# RUN: %lld -arch arm64 -pie -lSystem -lc++ %t/arm64-main.o %t/arm64-my-personality.o -o %t/arm64-personality-second
|
||||
# RUN: llvm-objdump --macho --unwind-info --syms --indirect-symbols --rebase %t/arm64-personality-second | FileCheck %s --check-prefixes=SECOND,CHECK
|
||||
# RUN: llvm-objdump --macho --unwind-info --syms --indirect-symbols --rebase %t/arm64-personality-second | FileCheck %s --check-prefixes=SECOND,CHECK -D#%x,BASE=0x100000000
|
||||
|
||||
# RUN: llvm-mc -filetype=obj -triple=arm64_32-apple-watchos %t/my-personality.s -o %t/arm64-32-my-personality.o
|
||||
# RUN: llvm-mc -filetype=obj -triple=arm64_32-apple-watchos %t/main.s -o %t/arm64-32-main.o
|
||||
# RUN: %lld-watchos -pie -lSystem -lc++ %t/arm64-32-my-personality.o %t/arm64-32-main.o -o %t/arm64-32-personality-first
|
||||
# RUN: llvm-objdump --macho --unwind-info --syms --indirect-symbols --rebase %t/arm64-32-personality-first | FileCheck %s --check-prefixes=FIRST,CHECK -D#%x,BASE=0x4000
|
||||
# RUN: %lld-watchos -pie -lSystem -lc++ %t/arm64-32-main.o %t/arm64-32-my-personality.o -o %t/arm64-32-personality-second
|
||||
# RUN: llvm-objdump --macho --unwind-info --syms --indirect-symbols --rebase %t/arm64-32-personality-second | FileCheck %s --check-prefixes=SECOND,CHECK -D#%x,BASE=0x4000
|
||||
|
||||
# FIRST: Indirect symbols for (__DATA_CONST,__got)
|
||||
# FIRST-NEXT: address index name
|
||||
@ -32,16 +39,16 @@
|
||||
|
||||
# CHECK: Contents of __unwind_info section:
|
||||
# CHECK: Personality functions: (count = 2)
|
||||
# CHECK-DAG: personality[{{[0-9]+}}]: 0x{{0*}}[[#MY_PERSONALITY-0x100000000]]
|
||||
# CHECK-DAG: personality[{{[0-9]+}}]: 0x{{0*}}[[#GXX_PERSONALITY-0x100000000]]
|
||||
# CHECK-DAG: personality[{{[0-9]+}}]: 0x{{0*}}[[#MY_PERSONALITY-BASE]]
|
||||
# CHECK-DAG: personality[{{[0-9]+}}]: 0x{{0*}}[[#GXX_PERSONALITY-BASE]]
|
||||
# CHECK: LSDA descriptors:
|
||||
# CHECK-DAG: function offset=0x{{0*}}[[#FOO-0x100000000]], LSDA offset=0x{{0*}}[[#EXCEPTION0-0x100000000]]
|
||||
# CHECK-DAG: function offset=0x{{0*}}[[#MAIN-0x100000000]], LSDA offset=0x{{0*}}[[#EXCEPTION1-0x100000000]]
|
||||
# CHECK-DAG: function offset=0x[[#%.8x,FOO-BASE]], LSDA offset=0x[[#%.8x,EXCEPTION0-BASE]]
|
||||
# CHECK-DAG: function offset=0x[[#%.8x,MAIN-BASE]], LSDA offset=0x[[#%.8x,EXCEPTION1-BASE]]
|
||||
|
||||
## Check that we do not add rebase opcodes to the compact unwind section.
|
||||
# CHECK: Rebase table:
|
||||
# CHECK-NEXT: segment section address type
|
||||
# CHECK-NEXT: __DATA_CONST __got 0x{{[0-9a-f]*}} pointer
|
||||
# CHECK-NEXT: __DATA_CONST __got 0x{{[0-9A-F]*}} pointer
|
||||
# CHECK-NOT: __TEXT
|
||||
|
||||
#--- my-personality.s
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user