stub_arm_classic.hpp [plain text]
/* -*- mode: C++; c-basic-offset: 4; tab-width: 4 -*-
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* Copyright (c) 2009 Apple Inc. All rights reserved.
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// already in ld::passes::stubs namespace
namespace arm {
namespace classic {
class LazyPointerAtom : public ld::Atom {
public:
LazyPointerAtom(ld::passes::stubs::Pass& pass, const ld::Atom& stubTo,
bool forLazyDylib, bool weakImport)
: ld::Atom(forLazyDylib ? _s_sectionLazy : _s_section, ld::Atom::definitionRegular,
ld::Atom::combineNever, ld::Atom::scopeLinkageUnit, ld::Atom::typeLazyPointer,
symbolTableNotIn, false, false, false, ld::Atom::Alignment(2)),
_stubTo(stubTo),
_fixup1(0, ld::Fixup::k1of1, ld::Fixup::kindStoreTargetAddressLittleEndian32,
forLazyDylib ? pass.internal()->lazyBindingHelper : pass.internal()->classicBindingHelper),
_fixup2(0, ld::Fixup::k1of1, ld::Fixup::kindLazyTarget, &stubTo)
{ _fixup2.weakImport = weakImport; pass.addAtom(*this); }
virtual const ld::File* file() const { return _stubTo.file(); }
virtual bool translationUnitSource(const char** dir, const char** nm) const
{ return false; }
virtual const char* name() const { return _stubTo.name(); }
virtual uint64_t size() const { return 4; }
virtual uint64_t objectAddress() const { return 0; }
virtual void copyRawContent(uint8_t buffer[]) const { }
virtual void setScope(Scope) { }
virtual ld::Fixup::iterator fixupsBegin() const { return (ld::Fixup*)&_fixup1; }
virtual ld::Fixup::iterator fixupsEnd() const { return &((ld::Fixup*)&_fixup2)[1]; }
private:
const ld::Atom& _stubTo;
ld::Fixup _fixup1;
ld::Fixup _fixup2;
static ld::Section _s_section;
static ld::Section _s_sectionLazy;
};
ld::Section LazyPointerAtom::_s_section("__DATA", "__la_symbol_ptr", ld::Section::typeLazyPointer);
ld::Section LazyPointerAtom::_s_sectionLazy("__DATA", "__ld_symbol_ptr", ld::Section::typeLazyDylibPointer);
class StubPICAtom : public ld::Atom {
public:
StubPICAtom(ld::passes::stubs::Pass& pass, const ld::Atom& stubTo,
bool forLazyDylib, bool weakImport)
: ld::Atom(_s_section, ld::Atom::definitionRegular, ld::Atom::combineNever,
ld::Atom::scopeLinkageUnit, ld::Atom::typeStub,
symbolTableNotIn, false, false, false, ld::Atom::Alignment(2)),
_stubTo(stubTo),
_lazyPointer(pass, stubTo, forLazyDylib, weakImport),
_fixup1(12, ld::Fixup::k1of4, ld::Fixup::kindSetTargetAddress, &_lazyPointer),
_fixup2(12, ld::Fixup::k2of4, ld::Fixup::kindSubtractTargetAddress, this),
_fixup3(12, ld::Fixup::k3of4, ld::Fixup::kindSubtractAddend, 12),
_fixup4(12, ld::Fixup::k4of4, ld::Fixup::kindStoreLittleEndian32)
{ pass.addAtom(*this); }
virtual const ld::File* file() const { return _stubTo.file(); }
virtual bool translationUnitSource(const char** dir, const char** nm) const
{ return false; }
virtual const char* name() const { return _stubTo.name(); }
virtual uint64_t size() const { return 16; }
virtual uint64_t objectAddress() const { return 0; }
virtual void copyRawContent(uint8_t buffer[]) const {
OSWriteLittleInt32(&buffer[ 0], 0, 0xe59fc004); // ldr ip, pc + 12
OSWriteLittleInt32(&buffer[ 4], 0, 0xe08fc00c); // add ip, pc, ip
OSWriteLittleInt32(&buffer[ 8], 0, 0xe59cf000); // ldr pc, [ip]
OSWriteLittleInt32(&buffer[12], 0, 0x00000000); // .long L_foo$lazy_ptr - (L1$scv + 8)
}
virtual void setScope(Scope) { }
virtual ld::Fixup::iterator fixupsBegin() const { return (ld::Fixup*)&_fixup1; }
virtual ld::Fixup::iterator fixupsEnd() const { return &((ld::Fixup*)&_fixup4)[1]; }
private:
const ld::Atom& _stubTo;
LazyPointerAtom _lazyPointer;
ld::Fixup _fixup1;
ld::Fixup _fixup2;
ld::Fixup _fixup3;
ld::Fixup _fixup4;
static ld::Section _s_section;
};
ld::Section StubPICAtom::_s_section("__TEXT", "__picsymbolstub4", ld::Section::typeStub);
class StubNoPICAtom : public ld::Atom {
public:
StubNoPICAtom(ld::passes::stubs::Pass& pass, const ld::Atom& stubTo,
bool forLazyDylib, bool weakImport)
: ld::Atom(_s_section, ld::Atom::definitionRegular, ld::Atom::combineNever,
ld::Atom::scopeLinkageUnit, ld::Atom::typeStub,
symbolTableNotIn, false, false, false, ld::Atom::Alignment(2)),
_stubTo(stubTo),
_lazyPointer(pass, stubTo, forLazyDylib, weakImport),
_fixup(8, ld::Fixup::k1of1, ld::Fixup::kindStoreTargetAddressLittleEndian32, &_lazyPointer)
{ pass.addAtom(*this); }
virtual const ld::File* file() const { return _stubTo.file(); }
virtual bool translationUnitSource(const char** dir, const char** nm) const
{ return false; }
virtual const char* name() const { return _stubTo.name(); }
virtual uint64_t size() const { return 12; }
virtual uint64_t objectAddress() const { return 0; }
virtual void copyRawContent(uint8_t buffer[]) const {
OSWriteLittleInt32(&buffer[ 0], 0, 0xe59fc000); // ldr ip, [pc, #0]
OSWriteLittleInt32(&buffer[ 4], 0, 0xe59cf000); // ldr pc, [ip]
OSWriteLittleInt32(&buffer[ 8], 0, 0x00000000); // .long L_foo$lazy_ptr
}
virtual void setScope(Scope) { }
virtual ld::Fixup::iterator fixupsBegin() const { return (ld::Fixup*)&_fixup; }
virtual ld::Fixup::iterator fixupsEnd() const { return &((ld::Fixup*)&_fixup)[1]; }
private:
const ld::Atom& _stubTo;
LazyPointerAtom _lazyPointer;
ld::Fixup _fixup;
static ld::Section _s_section;
};
ld::Section StubNoPICAtom::_s_section("__TEXT", "__symbol_stub4", ld::Section::typeStub);
} // namespace classic
} // namespace arm