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b5ca00a58de52d33c1935f49ce104f9d90cda67c
clang-p2996/lld/lib/ReaderWriter/MachO/ArchHandler_x86_64.cpp
Pete Cooper e8d9df4ea5 Use __nl_symbol_ptr instead of __got in the stubs pass on x86 archs. 
The non lazy atoms generated in the stubs pass use an image cache to
hold all of the pointers.  On arm archs, this is the __got section,
but on x86 archs it should be __nl_symbol_ptr.

rdar://problem/24572729

llvm-svn: 260271
2016-02-09 20:11:17 +00:00

834 lines
31 KiB
C++
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//===- lib/FileFormat/MachO/ArchHandler_x86_64.cpp ------------------------===//
//
// The LLVM Linker
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "ArchHandler.h"
#include "Atoms.h"
#include "MachONormalizedFileBinaryUtils.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/ADT/StringSwitch.h"
#include "llvm/ADT/Triple.h"
#include "llvm/Support/Endian.h"
#include "llvm/Support/ErrorHandling.h"
using namespace llvm::MachO;
using namespace lld::mach_o::normalized;
namespace lld {
namespace mach_o {
using llvm::support::ulittle32_t;
using llvm::support::ulittle64_t;
using llvm::support::little32_t;
using llvm::support::little64_t;
class ArchHandler_x86_64 : public ArchHandler {
public:
ArchHandler_x86_64() = default;
~ArchHandler_x86_64() override = default;
const Registry::KindStrings *kindStrings() override { return _sKindStrings; }
Reference::KindArch kindArch() override {
return Reference::KindArch::x86_64;
}
/// Used by GOTPass to locate GOT References
bool isGOTAccess(const Reference &ref, bool &canBypassGOT) override {
if (ref.kindNamespace() != Reference::KindNamespace::mach_o)
return false;
assert(ref.kindArch() == Reference::KindArch::x86_64);
switch (ref.kindValue()) {
case ripRel32GotLoad:
canBypassGOT = true;
return true;
case ripRel32Got:
canBypassGOT = false;
return true;
case imageOffsetGot:
canBypassGOT = false;
return true;
default:
return false;
}
}
bool isTLVAccess(const Reference &ref) const override {
assert(ref.kindNamespace() == Reference::KindNamespace::mach_o);
assert(ref.kindArch() == Reference::KindArch::x86_64);
return ref.kindValue() == ripRel32Tlv;
}
void updateReferenceToTLV(const Reference *ref) override {
assert(ref->kindNamespace() == Reference::KindNamespace::mach_o);
assert(ref->kindArch() == Reference::KindArch::x86_64);
assert(ref->kindValue() == ripRel32Tlv);
const_cast<Reference*>(ref)->setKindValue(ripRel32);
}
/// Used by GOTPass to update GOT References
void updateReferenceToGOT(const Reference *ref, bool targetNowGOT) override {
assert(ref->kindNamespace() == Reference::KindNamespace::mach_o);
assert(ref->kindArch() == Reference::KindArch::x86_64);
switch (ref->kindValue()) {
case ripRel32Got:
assert(targetNowGOT && "target must be GOT");
case ripRel32GotLoad:
const_cast<Reference *>(ref)
->setKindValue(targetNowGOT ? ripRel32 : ripRel32GotLoadNowLea);
break;
case imageOffsetGot:
const_cast<Reference *>(ref)->setKindValue(imageOffset);
break;
default:
llvm_unreachable("unknown GOT reference kind");
}
}
bool needsCompactUnwind() override {
return true;
}
Reference::KindValue imageOffsetKind() override {
return imageOffset;
}
Reference::KindValue imageOffsetKindIndirect() override {
return imageOffsetGot;
}
Reference::KindValue unwindRefToCIEKind() override {
return negDelta32;
}
Reference::KindValue unwindRefToFunctionKind() override{
return unwindFDEToFunction;
}
Reference::KindValue unwindRefToEhFrameKind() override {
return unwindInfoToEhFrame;
}
Reference::KindValue pointerKind() override {
return pointer64;
}
uint32_t dwarfCompactUnwindType() override {
return 0x04000000U;
}
const StubInfo &stubInfo() override { return _sStubInfo; }
bool isNonCallBranch(const Reference &) override {
return false;
}
bool isCallSite(const Reference &) override;
bool isPointer(const Reference &) override;
bool isPairedReloc(const normalized::Relocation &) override;
std::error_code getReferenceInfo(const normalized::Relocation &reloc,
const DefinedAtom *inAtom,
uint32_t offsetInAtom,
uint64_t fixupAddress, bool swap,
FindAtomBySectionAndAddress atomFromAddress,
FindAtomBySymbolIndex atomFromSymbolIndex,
Reference::KindValue *kind,
const lld::Atom **target,
Reference::Addend *addend) override;
std::error_code
getPairReferenceInfo(const normalized::Relocation &reloc1,
const normalized::Relocation &reloc2,
const DefinedAtom *inAtom,
uint32_t offsetInAtom,
uint64_t fixupAddress, bool swap, bool scatterable,
FindAtomBySectionAndAddress atomFromAddress,
FindAtomBySymbolIndex atomFromSymbolIndex,
Reference::KindValue *kind,
const lld::Atom **target,
Reference::Addend *addend) override;
bool needsLocalSymbolInRelocatableFile(const DefinedAtom *atom) override {
return (atom->contentType() == DefinedAtom::typeCString);
}
void generateAtomContent(const DefinedAtom &atom, bool relocatable,
FindAddressForAtom findAddress,
FindAddressForAtom findSectionAddress,
uint64_t imageBase,
uint8_t *atomContentBuffer) override;
void appendSectionRelocations(const DefinedAtom &atom,
uint64_t atomSectionOffset,
const Reference &ref,
FindSymbolIndexForAtom symbolIndexForAtom,
FindSectionIndexForAtom sectionIndexForAtom,
FindAddressForAtom addressForAtom,
normalized::Relocations &relocs) override;
private:
static const Registry::KindStrings _sKindStrings[];
static const StubInfo _sStubInfo;
enum X86_64Kind: Reference::KindValue {
invalid, /// for error condition
// Kinds found in mach-o .o files:
branch32, /// ex: call _foo
ripRel32, /// ex: movq _foo(%rip), %rax
ripRel32Minus1, /// ex: movb $0x12, _foo(%rip)
ripRel32Minus2, /// ex: movw $0x1234, _foo(%rip)
ripRel32Minus4, /// ex: movl $0x12345678, _foo(%rip)
ripRel32Anon, /// ex: movq L1(%rip), %rax
ripRel32Minus1Anon, /// ex: movb $0x12, L1(%rip)
ripRel32Minus2Anon, /// ex: movw $0x1234, L1(%rip)
ripRel32Minus4Anon, /// ex: movw $0x12345678, L1(%rip)
ripRel32GotLoad, /// ex: movq _foo@GOTPCREL(%rip), %rax
ripRel32Got, /// ex: pushq _foo@GOTPCREL(%rip)
ripRel32Tlv, /// ex: movq _foo@TLVP(%rip), %rdi
pointer64, /// ex: .quad _foo
pointer64Anon, /// ex: .quad L1
delta64, /// ex: .quad _foo - .
delta32, /// ex: .long _foo - .
delta64Anon, /// ex: .quad L1 - .
delta32Anon, /// ex: .long L1 - .
negDelta32, /// ex: .long . - _foo
// Kinds introduced by Passes:
ripRel32GotLoadNowLea, /// Target of GOT load is in linkage unit so
/// "movq _foo@GOTPCREL(%rip), %rax" can be changed
/// to "leaq _foo(%rip), %rax
lazyPointer, /// Location contains a lazy pointer.
lazyImmediateLocation, /// Location contains immediate value used in stub.
imageOffset, /// Location contains offset of atom in final image
imageOffsetGot, /// Location contains offset of GOT entry for atom in
/// final image (typically personality function).
unwindFDEToFunction, /// Nearly delta64, but cannot be rematerialized in
/// relocatable object (yay for implicit contracts!).
unwindInfoToEhFrame, /// Fix low 24 bits of compact unwind encoding to
/// refer to __eh_frame entry.
tlvInitSectionOffset /// Location contains offset tlv init-value atom
/// within the __thread_data section.
};
Reference::KindValue kindFromReloc(const normalized::Relocation &reloc);
Reference::KindValue kindFromRelocPair(const normalized::Relocation &reloc1,
const normalized::Relocation &reloc2);
void applyFixupFinal(const Reference &ref, uint8_t *location,
uint64_t fixupAddress, uint64_t targetAddress,
uint64_t inAtomAddress, uint64_t imageBaseAddress,
FindAddressForAtom findSectionAddress);
void applyFixupRelocatable(const Reference &ref, uint8_t *location,
uint64_t fixupAddress,
uint64_t targetAddress,
uint64_t inAtomAddress);
};
const Registry::KindStrings ArchHandler_x86_64::_sKindStrings[] = {
LLD_KIND_STRING_ENTRY(invalid), LLD_KIND_STRING_ENTRY(branch32),
LLD_KIND_STRING_ENTRY(ripRel32), LLD_KIND_STRING_ENTRY(ripRel32Minus1),
LLD_KIND_STRING_ENTRY(ripRel32Minus2), LLD_KIND_STRING_ENTRY(ripRel32Minus4),
LLD_KIND_STRING_ENTRY(ripRel32Anon),
LLD_KIND_STRING_ENTRY(ripRel32Minus1Anon),
LLD_KIND_STRING_ENTRY(ripRel32Minus2Anon),
LLD_KIND_STRING_ENTRY(ripRel32Minus4Anon),
LLD_KIND_STRING_ENTRY(ripRel32GotLoad),
LLD_KIND_STRING_ENTRY(ripRel32GotLoadNowLea),
LLD_KIND_STRING_ENTRY(ripRel32Got), LLD_KIND_STRING_ENTRY(ripRel32Tlv),
LLD_KIND_STRING_ENTRY(lazyPointer),
LLD_KIND_STRING_ENTRY(lazyImmediateLocation),
LLD_KIND_STRING_ENTRY(pointer64), LLD_KIND_STRING_ENTRY(pointer64Anon),
LLD_KIND_STRING_ENTRY(delta32), LLD_KIND_STRING_ENTRY(delta64),
LLD_KIND_STRING_ENTRY(delta32Anon), LLD_KIND_STRING_ENTRY(delta64Anon),
LLD_KIND_STRING_ENTRY(negDelta32),
LLD_KIND_STRING_ENTRY(imageOffset), LLD_KIND_STRING_ENTRY(imageOffsetGot),
LLD_KIND_STRING_ENTRY(unwindFDEToFunction),
LLD_KIND_STRING_ENTRY(unwindInfoToEhFrame),
LLD_KIND_STRING_ENTRY(tlvInitSectionOffset),
LLD_KIND_STRING_END
};
const ArchHandler::StubInfo ArchHandler_x86_64::_sStubInfo = {
"dyld_stub_binder",
// Lazy pointer references
{ Reference::KindArch::x86_64, pointer64, 0, 0 },
{ Reference::KindArch::x86_64, lazyPointer, 0, 0 },
// GOT pointer to dyld_stub_binder
{ Reference::KindArch::x86_64, pointer64, 0, 0 },
// x86_64 code alignment 2^1
1,
// Stub size and code
6,
{ 0xff, 0x25, 0x00, 0x00, 0x00, 0x00 }, // jmp *lazyPointer
{ Reference::KindArch::x86_64, ripRel32, 2, 0 },
{ false, 0, 0, 0 },
// Stub Helper size and code
10,
{ 0x68, 0x00, 0x00, 0x00, 0x00, // pushq $lazy-info-offset
0xE9, 0x00, 0x00, 0x00, 0x00 }, // jmp helperhelper
{ Reference::KindArch::x86_64, lazyImmediateLocation, 1, 0 },
{ Reference::KindArch::x86_64, branch32, 6, 0 },
// Stub helper image cache content type
DefinedAtom::typeNonLazyPointer,
// Stub Helper-Common size and code
16,
// Stub helper alignment
2,
{ 0x4C, 0x8D, 0x1D, 0x00, 0x00, 0x00, 0x00, // leaq cache(%rip),%r11
0x41, 0x53, // push %r11
0xFF, 0x25, 0x00, 0x00, 0x00, 0x00, // jmp *binder(%rip)
0x90 }, // nop
{ Reference::KindArch::x86_64, ripRel32, 3, 0 },
{ false, 0, 0, 0 },
{ Reference::KindArch::x86_64, ripRel32, 11, 0 },
{ false, 0, 0, 0 }
};
bool ArchHandler_x86_64::isCallSite(const Reference &ref) {
if (ref.kindNamespace() != Reference::KindNamespace::mach_o)
return false;
assert(ref.kindArch() == Reference::KindArch::x86_64);
return (ref.kindValue() == branch32);
}
bool ArchHandler_x86_64::isPointer(const Reference &ref) {
if (ref.kindNamespace() != Reference::KindNamespace::mach_o)
return false;
assert(ref.kindArch() == Reference::KindArch::x86_64);
Reference::KindValue kind = ref.kindValue();
return (kind == pointer64 || kind == pointer64Anon);
}
bool ArchHandler_x86_64::isPairedReloc(const Relocation &reloc) {
return (reloc.type == X86_64_RELOC_SUBTRACTOR);
}
Reference::KindValue
ArchHandler_x86_64::kindFromReloc(const Relocation &reloc) {
switch(relocPattern(reloc)) {
case X86_64_RELOC_BRANCH | rPcRel | rExtern | rLength4:
return branch32;
case X86_64_RELOC_SIGNED | rPcRel | rExtern | rLength4:
return ripRel32;
case X86_64_RELOC_SIGNED | rPcRel | rLength4:
return ripRel32Anon;
case X86_64_RELOC_SIGNED_1 | rPcRel | rExtern | rLength4:
return ripRel32Minus1;
case X86_64_RELOC_SIGNED_1 | rPcRel | rLength4:
return ripRel32Minus1Anon;
case X86_64_RELOC_SIGNED_2 | rPcRel | rExtern | rLength4:
return ripRel32Minus2;
case X86_64_RELOC_SIGNED_2 | rPcRel | rLength4:
return ripRel32Minus2Anon;
case X86_64_RELOC_SIGNED_4 | rPcRel | rExtern | rLength4:
return ripRel32Minus4;
case X86_64_RELOC_SIGNED_4 | rPcRel | rLength4:
return ripRel32Minus4Anon;
case X86_64_RELOC_GOT_LOAD | rPcRel | rExtern | rLength4:
return ripRel32GotLoad;
case X86_64_RELOC_GOT | rPcRel | rExtern | rLength4:
return ripRel32Got;
case X86_64_RELOC_TLV | rPcRel | rExtern | rLength4:
return ripRel32Tlv;
case X86_64_RELOC_UNSIGNED | rExtern | rLength8:
return pointer64;
case X86_64_RELOC_UNSIGNED | rLength8:
return pointer64Anon;
default:
return invalid;
}
}
std::error_code
ArchHandler_x86_64::getReferenceInfo(const Relocation &reloc,
const DefinedAtom *inAtom,
uint32_t offsetInAtom,
uint64_t fixupAddress, bool swap,
FindAtomBySectionAndAddress atomFromAddress,
FindAtomBySymbolIndex atomFromSymbolIndex,
Reference::KindValue *kind,
const lld::Atom **target,
Reference::Addend *addend) {
typedef std::error_code E;
*kind = kindFromReloc(reloc);
if (*kind == invalid)
return make_dynamic_error_code("unknown type");
const uint8_t *fixupContent = &inAtom->rawContent()[offsetInAtom];
uint64_t targetAddress;
switch (*kind) {
case branch32:
case ripRel32:
if (E ec = atomFromSymbolIndex(reloc.symbol, target))
return ec;
*addend = *(const little32_t *)fixupContent;
return std::error_code();
case ripRel32Minus1:
if (E ec = atomFromSymbolIndex(reloc.symbol, target))
return ec;
*addend = (int32_t)*(const little32_t *)fixupContent + 1;
return std::error_code();
case ripRel32Minus2:
if (E ec = atomFromSymbolIndex(reloc.symbol, target))
return ec;
*addend = (int32_t)*(const little32_t *)fixupContent + 2;
return std::error_code();
case ripRel32Minus4:
if (E ec = atomFromSymbolIndex(reloc.symbol, target))
return ec;
*addend = (int32_t)*(const little32_t *)fixupContent + 4;
return std::error_code();
case ripRel32Anon:
targetAddress = fixupAddress + 4 + *(const little32_t *)fixupContent;
return atomFromAddress(reloc.symbol, targetAddress, target, addend);
case ripRel32Minus1Anon:
targetAddress = fixupAddress + 5 + *(const little32_t *)fixupContent;
return atomFromAddress(reloc.symbol, targetAddress, target, addend);
case ripRel32Minus2Anon:
targetAddress = fixupAddress + 6 + *(const little32_t *)fixupContent;
return atomFromAddress(reloc.symbol, targetAddress, target, addend);
case ripRel32Minus4Anon:
targetAddress = fixupAddress + 8 + *(const little32_t *)fixupContent;
return atomFromAddress(reloc.symbol, targetAddress, target, addend);
case ripRel32GotLoad:
case ripRel32Got:
case ripRel32Tlv:
if (E ec = atomFromSymbolIndex(reloc.symbol, target))
return ec;
*addend = *(const little32_t *)fixupContent;
return std::error_code();
case tlvInitSectionOffset:
case pointer64:
if (E ec = atomFromSymbolIndex(reloc.symbol, target))
return ec;
// If this is the 3rd pointer of a tlv-thunk (i.e. the pointer to the TLV's
// initial value) we need to handle it specially.
if (inAtom->contentType() == DefinedAtom::typeThunkTLV &&
offsetInAtom == 16) {
*kind = tlvInitSectionOffset;
assert(*addend == 0 && "TLV-init has non-zero addend?");
} else
*addend = *(const little64_t *)fixupContent;
return std::error_code();
case pointer64Anon:
targetAddress = *(const little64_t *)fixupContent;
return atomFromAddress(reloc.symbol, targetAddress, target, addend);
default:
llvm_unreachable("bad reloc kind");
}
}
Reference::KindValue
ArchHandler_x86_64::kindFromRelocPair(const normalized::Relocation &reloc1,
const normalized::Relocation &reloc2) {
switch(relocPattern(reloc1) << 16 | relocPattern(reloc2)) {
case ((X86_64_RELOC_SUBTRACTOR | rExtern | rLength8) << 16 |
X86_64_RELOC_UNSIGNED | rExtern | rLength8):
return delta64;
case ((X86_64_RELOC_SUBTRACTOR | rExtern | rLength4) << 16 |
X86_64_RELOC_UNSIGNED | rExtern | rLength4):
return delta32;
case ((X86_64_RELOC_SUBTRACTOR | rExtern | rLength8) << 16 |
X86_64_RELOC_UNSIGNED | rLength8):
return delta64Anon;
case ((X86_64_RELOC_SUBTRACTOR | rExtern | rLength4) << 16 |
X86_64_RELOC_UNSIGNED | rLength4):
return delta32Anon;
default:
llvm_unreachable("bad reloc pairs");
}
}
std::error_code
ArchHandler_x86_64::getPairReferenceInfo(const normalized::Relocation &reloc1,
const normalized::Relocation &reloc2,
const DefinedAtom *inAtom,
uint32_t offsetInAtom,
uint64_t fixupAddress, bool swap,
bool scatterable,
FindAtomBySectionAndAddress atomFromAddress,
FindAtomBySymbolIndex atomFromSymbolIndex,
Reference::KindValue *kind,
const lld::Atom **target,
Reference::Addend *addend) {
*kind = kindFromRelocPair(reloc1, reloc2);
if (*kind == invalid)
return make_dynamic_error_code("unknown pair");
const uint8_t *fixupContent = &inAtom->rawContent()[offsetInAtom];
typedef std::error_code E;
uint64_t targetAddress;
const lld::Atom *fromTarget;
if (E ec = atomFromSymbolIndex(reloc1.symbol, &fromTarget))
return ec;
if (fromTarget != inAtom)
return make_dynamic_error_code("pointer diff not in base atom");
switch (*kind) {
case delta64:
if (E ec = atomFromSymbolIndex(reloc2.symbol, target))
return ec;
*addend = (int64_t)*(const little64_t *)fixupContent + offsetInAtom;
return std::error_code();
case delta32:
if (E ec = atomFromSymbolIndex(reloc2.symbol, target))
return ec;
*addend = (int32_t)*(const little32_t *)fixupContent + offsetInAtom;
return std::error_code();
case delta64Anon:
targetAddress = offsetInAtom + (int64_t)*(const little64_t *)fixupContent;
return atomFromAddress(reloc2.symbol, targetAddress, target, addend);
case delta32Anon:
targetAddress = offsetInAtom + (int32_t)*(const little32_t *)fixupContent;
return atomFromAddress(reloc2.symbol, targetAddress, target, addend);
default:
llvm_unreachable("bad reloc pair kind");
}
}
void ArchHandler_x86_64::generateAtomContent(
const DefinedAtom &atom, bool relocatable, FindAddressForAtom findAddress,
FindAddressForAtom findSectionAddress, uint64_t imageBaseAddress,
uint8_t *atomContentBuffer) {
// Copy raw bytes.
memcpy(atomContentBuffer, atom.rawContent().data(), atom.size());
// Apply fix-ups.
for (const Reference *ref : atom) {
uint32_t offset = ref->offsetInAtom();
const Atom *target = ref->target();
uint64_t targetAddress = 0;
if (isa<DefinedAtom>(target))
targetAddress = findAddress(*target);
uint64_t atomAddress = findAddress(atom);
uint64_t fixupAddress = atomAddress + offset;
if (relocatable) {
applyFixupRelocatable(*ref, &atomContentBuffer[offset],
fixupAddress, targetAddress,
atomAddress);
} else {
applyFixupFinal(*ref, &atomContentBuffer[offset],
fixupAddress, targetAddress,
atomAddress, imageBaseAddress, findSectionAddress);
}
}
}
void ArchHandler_x86_64::applyFixupFinal(
const Reference &ref, uint8_t *loc, uint64_t fixupAddress,
uint64_t targetAddress, uint64_t inAtomAddress, uint64_t imageBaseAddress,
FindAddressForAtom findSectionAddress) {
if (ref.kindNamespace() != Reference::KindNamespace::mach_o)
return;
assert(ref.kindArch() == Reference::KindArch::x86_64);
ulittle32_t *loc32 = reinterpret_cast<ulittle32_t *>(loc);
ulittle64_t *loc64 = reinterpret_cast<ulittle64_t *>(loc);
switch (static_cast<X86_64Kind>(ref.kindValue())) {
case branch32:
case ripRel32:
case ripRel32Anon:
case ripRel32Got:
case ripRel32GotLoad:
case ripRel32Tlv:
*loc32 = targetAddress - (fixupAddress + 4) + ref.addend();
return;
case pointer64:
case pointer64Anon:
*loc64 = targetAddress + ref.addend();
return;
case tlvInitSectionOffset:
*loc64 = targetAddress - findSectionAddress(*ref.target()) + ref.addend();
return;
case ripRel32Minus1:
case ripRel32Minus1Anon:
*loc32 = targetAddress - (fixupAddress + 5) + ref.addend();
return;
case ripRel32Minus2:
case ripRel32Minus2Anon:
*loc32 = targetAddress - (fixupAddress + 6) + ref.addend();
return;
case ripRel32Minus4:
case ripRel32Minus4Anon:
*loc32 = targetAddress - (fixupAddress + 8) + ref.addend();
return;
case delta32:
case delta32Anon:
*loc32 = targetAddress - fixupAddress + ref.addend();
return;
case delta64:
case delta64Anon:
case unwindFDEToFunction:
*loc64 = targetAddress - fixupAddress + ref.addend();
return;
case ripRel32GotLoadNowLea:
// Change MOVQ to LEA
assert(loc[-2] == 0x8B);
loc[-2] = 0x8D;
*loc32 = targetAddress - (fixupAddress + 4) + ref.addend();
return;
case negDelta32:
*loc32 = fixupAddress - targetAddress + ref.addend();
return;
case lazyPointer:
// Do nothing
return;
case lazyImmediateLocation:
*loc32 = ref.addend();
return;
case imageOffset:
case imageOffsetGot:
*loc32 = (targetAddress - imageBaseAddress) + ref.addend();
return;
case unwindInfoToEhFrame: {
uint64_t val = targetAddress - findSectionAddress(*ref.target()) + ref.addend();
assert(val < 0xffffffU && "offset in __eh_frame too large");
*loc32 = (*loc32 & 0xff000000U) | val;
return;
}
case invalid:
// Fall into llvm_unreachable().
break;
}
llvm_unreachable("invalid x86_64 Reference Kind");
}
void ArchHandler_x86_64::applyFixupRelocatable(const Reference &ref,
uint8_t *loc,
uint64_t fixupAddress,
uint64_t targetAddress,
uint64_t inAtomAddress) {
if (ref.kindNamespace() != Reference::KindNamespace::mach_o)
return;
assert(ref.kindArch() == Reference::KindArch::x86_64);
ulittle32_t *loc32 = reinterpret_cast<ulittle32_t *>(loc);
ulittle64_t *loc64 = reinterpret_cast<ulittle64_t *>(loc);
switch (static_cast<X86_64Kind>(ref.kindValue())) {
case branch32:
case ripRel32:
case ripRel32Got:
case ripRel32GotLoad:
case ripRel32Tlv:
*loc32 = ref.addend();
return;
case ripRel32Anon:
*loc32 = (targetAddress - (fixupAddress + 4)) + ref.addend();
return;
case tlvInitSectionOffset:
case pointer64:
*loc64 = ref.addend();
return;
case pointer64Anon:
*loc64 = targetAddress + ref.addend();
return;
case ripRel32Minus1:
*loc32 = ref.addend() - 1;
return;
case ripRel32Minus1Anon:
*loc32 = (targetAddress - (fixupAddress + 5)) + ref.addend();
return;
case ripRel32Minus2:
*loc32 = ref.addend() - 2;
return;
case ripRel32Minus2Anon:
*loc32 = (targetAddress - (fixupAddress + 6)) + ref.addend();
return;
case ripRel32Minus4:
*loc32 = ref.addend() - 4;
return;
case ripRel32Minus4Anon:
*loc32 = (targetAddress - (fixupAddress + 8)) + ref.addend();
return;
case delta32:
*loc32 = ref.addend() + inAtomAddress - fixupAddress;
return;
case delta32Anon:
// The value we write here should be the the delta to the target
// after taking in to account the difference from the fixup back to the
// last defined label
// ie, if we have:
// _base: ...
// Lfixup: .quad Ltarget - .
// ...
// Ltarget:
//
// Then we want to encode the value (Ltarget + addend) - (LFixup - _base)
*loc32 = (targetAddress + ref.addend()) - (fixupAddress - inAtomAddress);
return;
case delta64:
*loc64 = ref.addend() + inAtomAddress - fixupAddress;
return;
case delta64Anon:
// The value we write here should be the the delta to the target
// after taking in to account the difference from the fixup back to the
// last defined label
// ie, if we have:
// _base: ...
// Lfixup: .quad Ltarget - .
// ...
// Ltarget:
//
// Then we want to encode the value (Ltarget + addend) - (LFixup - _base)
*loc64 = (targetAddress + ref.addend()) - (fixupAddress - inAtomAddress);
return;
case negDelta32:
*loc32 = fixupAddress - targetAddress + ref.addend();
return;
case ripRel32GotLoadNowLea:
llvm_unreachable("ripRel32GotLoadNowLea implies GOT pass was run");
return;
case lazyPointer:
case lazyImmediateLocation:
llvm_unreachable("lazy reference kind implies Stubs pass was run");
return;
case imageOffset:
case imageOffsetGot:
case unwindInfoToEhFrame:
llvm_unreachable("fixup implies __unwind_info");
return;
case unwindFDEToFunction:
// Do nothing for now
return;
case invalid:
// Fall into llvm_unreachable().
break;
}
llvm_unreachable("unknown x86_64 Reference Kind");
}
void ArchHandler_x86_64::appendSectionRelocations(
const DefinedAtom &atom,
uint64_t atomSectionOffset,
const Reference &ref,
FindSymbolIndexForAtom symbolIndexForAtom,
FindSectionIndexForAtom sectionIndexForAtom,
FindAddressForAtom addressForAtom,
normalized::Relocations &relocs) {
if (ref.kindNamespace() != Reference::KindNamespace::mach_o)
return;
assert(ref.kindArch() == Reference::KindArch::x86_64);
uint32_t sectionOffset = atomSectionOffset + ref.offsetInAtom();
switch (static_cast<X86_64Kind>(ref.kindValue())) {
case branch32:
appendReloc(relocs, sectionOffset, symbolIndexForAtom(*ref.target()), 0,
X86_64_RELOC_BRANCH | rPcRel | rExtern | rLength4);
return;
case ripRel32:
appendReloc(relocs, sectionOffset, symbolIndexForAtom(*ref.target()), 0,
X86_64_RELOC_SIGNED | rPcRel | rExtern | rLength4 );
return;
case ripRel32Anon:
appendReloc(relocs, sectionOffset, sectionIndexForAtom(*ref.target()), 0,
X86_64_RELOC_SIGNED | rPcRel | rLength4 );
return;
case ripRel32Got:
appendReloc(relocs, sectionOffset, symbolIndexForAtom(*ref.target()), 0,
X86_64_RELOC_GOT | rPcRel | rExtern | rLength4 );
return;
case ripRel32GotLoad:
appendReloc(relocs, sectionOffset, symbolIndexForAtom(*ref.target()), 0,
X86_64_RELOC_GOT_LOAD | rPcRel | rExtern | rLength4 );
return;
case ripRel32Tlv:
appendReloc(relocs, sectionOffset, symbolIndexForAtom(*ref.target()), 0,
X86_64_RELOC_TLV | rPcRel | rExtern | rLength4 );
return;
case tlvInitSectionOffset:
case pointer64:
appendReloc(relocs, sectionOffset, symbolIndexForAtom(*ref.target()), 0,
X86_64_RELOC_UNSIGNED | rExtern | rLength8);
return;
case pointer64Anon:
appendReloc(relocs, sectionOffset, sectionIndexForAtom(*ref.target()), 0,
X86_64_RELOC_UNSIGNED | rLength8);
return;
case ripRel32Minus1:
appendReloc(relocs, sectionOffset, symbolIndexForAtom(*ref.target()), 0,
X86_64_RELOC_SIGNED_1 | rPcRel | rExtern | rLength4 );
return;
case ripRel32Minus1Anon:
appendReloc(relocs, sectionOffset, sectionIndexForAtom(*ref.target()), 0,
X86_64_RELOC_SIGNED_1 | rPcRel | rLength4 );
return;
case ripRel32Minus2:
appendReloc(relocs, sectionOffset, symbolIndexForAtom(*ref.target()), 0,
X86_64_RELOC_SIGNED_2 | rPcRel | rExtern | rLength4 );
return;
case ripRel32Minus2Anon:
appendReloc(relocs, sectionOffset, sectionIndexForAtom(*ref.target()), 0,
X86_64_RELOC_SIGNED_2 | rPcRel | rLength4 );
return;
case ripRel32Minus4:
appendReloc(relocs, sectionOffset, symbolIndexForAtom(*ref.target()), 0,
X86_64_RELOC_SIGNED_4 | rPcRel | rExtern | rLength4 );
return;
case ripRel32Minus4Anon:
appendReloc(relocs, sectionOffset, sectionIndexForAtom(*ref.target()), 0,
X86_64_RELOC_SIGNED_4 | rPcRel | rLength4 );
return;
case delta32:
appendReloc(relocs, sectionOffset, symbolIndexForAtom(atom), 0,
X86_64_RELOC_SUBTRACTOR | rExtern | rLength4 );
appendReloc(relocs, sectionOffset, symbolIndexForAtom(*ref.target()), 0,
X86_64_RELOC_UNSIGNED | rExtern | rLength4 );
return;
case delta32Anon:
appendReloc(relocs, sectionOffset, symbolIndexForAtom(atom), 0,
X86_64_RELOC_SUBTRACTOR | rExtern | rLength4 );
appendReloc(relocs, sectionOffset, sectionIndexForAtom(*ref.target()), 0,
X86_64_RELOC_UNSIGNED | rLength4 );
return;
case delta64:
appendReloc(relocs, sectionOffset, symbolIndexForAtom(atom), 0,
X86_64_RELOC_SUBTRACTOR | rExtern | rLength8 );
appendReloc(relocs, sectionOffset, symbolIndexForAtom(*ref.target()), 0,
X86_64_RELOC_UNSIGNED | rExtern | rLength8 );
return;
case delta64Anon:
appendReloc(relocs, sectionOffset, symbolIndexForAtom(atom), 0,
X86_64_RELOC_SUBTRACTOR | rExtern | rLength8 );
appendReloc(relocs, sectionOffset, sectionIndexForAtom(*ref.target()), 0,
X86_64_RELOC_UNSIGNED | rLength8 );
return;
case unwindFDEToFunction:
case unwindInfoToEhFrame:
case negDelta32:
return;
case ripRel32GotLoadNowLea:
llvm_unreachable("ripRel32GotLoadNowLea implies GOT pass was run");
return;
case lazyPointer:
case lazyImmediateLocation:
llvm_unreachable("lazy reference kind implies Stubs pass was run");
return;
case imageOffset:
case imageOffsetGot:
llvm_unreachable("__unwind_info references should have been resolved");
return;
case invalid:
// Fall into llvm_unreachable().
break;
}
llvm_unreachable("unknown x86_64 Reference Kind");
}
std::unique_ptr<mach_o::ArchHandler> ArchHandler::create_x86_64() {
return std::unique_ptr<mach_o::ArchHandler>(new ArchHandler_x86_64());
}
} // namespace mach_o
} // namespace lld
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