stub_ppc_classic.hpp [plain text]
/* -*- mode: C++; c-basic-offset: 4; tab-width: 4 -*-
*
* Copyright (c) 2009 Apple Inc. All rights reserved.
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// already in ld::passes::stubs namespace
namespace ppc {
namespace classic {
class LazyPointerAtom : public ld::Atom {
public:
LazyPointerAtom(ld::passes::stubs::Pass& pass, const ld::Atom& stubTo,
bool forLazyDylib, bool for64, bool weakImport)
: ld::Atom( forLazyDylib ? _s_sectionLazy : _s_section,
ld::Atom::definitionRegular, ld::Atom::combineNever,
ld::Atom::scopeTranslationUnit,
forLazyDylib ? ld::Atom::typeLazyDylibPointer : ld::Atom::typeLazyPointer,
symbolTableNotIn, false, false, false, for64 ? ld::Atom::Alignment(3) : ld::Atom::Alignment(2)),
_stubTo(stubTo),
_fixup1(0, ld::Fixup::k1of1,
for64 ? ld::Fixup::kindStoreTargetAddressBigEndian64 : ld::Fixup::kindStoreTargetAddressBigEndian32,
forLazyDylib ? pass.internal()->lazyBindingHelper : pass.internal()->classicBindingHelper),
_fixup2(0, ld::Fixup::k1of1, ld::Fixup::kindLazyTarget, &stubTo),
_for64(for64)
{ _fixup2.weakImport = weakImport; pass.addAtom(*this); }
virtual const ld::File* file() const { return _stubTo.file(); }
virtual bool translationUnitSource(const char** dir, const char** ) const
{ return false; }
virtual const char* name() const { return _stubTo.name(); }
virtual uint64_t size() const { return _for64 ? 8 : 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 &_fixup1; }
virtual ld::Fixup::iterator fixupsEnd() const { return &((ld::Fixup*)&_fixup2)[1]; }
private:
const ld::Atom& _stubTo;
mutable ld::Fixup _fixup1;
mutable ld::Fixup _fixup2;
const bool _for64;
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 for64, 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, for64, 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, 8),
_fixup4(12, ld::Fixup::k4of4, ld::Fixup::kindStorePPCPicHigh16AddLow),
_fixup5(20, ld::Fixup::k1of4, ld::Fixup::kindSetTargetAddress, &_lazyPointer),
_fixup6(20, ld::Fixup::k2of4, ld::Fixup::kindSubtractTargetAddress, this),
_fixup7(20, ld::Fixup::k3of4, ld::Fixup::kindSubtractAddend, 8),
_fixup8(20, ld::Fixup::k4of4, for64 ? ld::Fixup::kindStorePPCPicLow14 : ld::Fixup::kindStorePPCPicLow16),
_for64(for64)
{ pass.addAtom(*this); }
virtual const ld::File* file() const { return _stubTo.file(); }
virtual bool translationUnitSource(const char** dir, const char** ) const
{ return false; }
virtual const char* name() const { return _stubTo.name(); }
virtual uint64_t size() const { return 32; }
virtual uint64_t objectAddress() const { return 0; }
virtual void copyRawContent(uint8_t buffer[]) const {
OSWriteBigInt32(&buffer[ 0], 0, 0x7c0802a6); // mflr r0
OSWriteBigInt32(&buffer[ 4], 0, 0x429f0005); // bcl 20,31,Lpicbase
OSWriteBigInt32(&buffer[ 8], 0, 0x7d6802a6); // Lpicbase: mflr r11
OSWriteBigInt32(&buffer[12], 0, 0x3d6b0000); // addis r11,r11,ha16(L_fwrite$lazy_ptr-Lpicbase)
OSWriteBigInt32(&buffer[16], 0, 0x7c0803a6); // mtlr r0
if ( _for64 )
OSWriteBigInt32(&buffer[20], 0, 0xe98b0001);// ldu r12,lo16(L_fwrite$lazy_ptr-Lpicbase)(r11)
else
OSWriteBigInt32(&buffer[20], 0, 0x858b0000);// lwzu r12,lo16(L_fwrite$lazy_ptr-Lpicbase)(r11)
OSWriteBigInt32(&buffer[24], 0, 0x7d8903a6); // mtctr r12
OSWriteBigInt32(&buffer[28], 0, 0x4e800420); // bctr
}
virtual void setScope(Scope) { }
virtual ld::Fixup::iterator fixupsBegin() const { return &_fixup1; }
virtual ld::Fixup::iterator fixupsEnd() const { return &((ld::Fixup*)&_fixup8)[1]; }
private:
const ld::Atom& _stubTo;
LazyPointerAtom _lazyPointer;
mutable ld::Fixup _fixup1;
mutable ld::Fixup _fixup2;
mutable ld::Fixup _fixup3;
mutable ld::Fixup _fixup4;
mutable ld::Fixup _fixup5;
mutable ld::Fixup _fixup6;
mutable ld::Fixup _fixup7;
mutable ld::Fixup _fixup8;
const bool _for64;
static ld::Section _s_section;
};
ld::Section StubPICAtom::_s_section("__TEXT", "__picsymbolstub1", ld::Section::typeStub);
class StubNoPICAtom : public ld::Atom {
public:
StubNoPICAtom(ld::passes::stubs::Pass& pass, const ld::Atom& stubTo,
bool forLazyDylib, bool for64, bool weakImport)
: ld::Atom(_s_section, ld::Atom::definitionRegular, ld::Atom::combineNever,
ld::Atom::scopeLinkageUnit, ld::Atom::typeStub,
symbolTableNotIn, false, false, false, ld::Atom::Alignment(2)),
_stubTo(stubTo),
_lazyPointer(pass, stubTo, forLazyDylib, for64, weakImport),
_fixup1(0, ld::Fixup::k1of2, ld::Fixup::kindSetTargetAddress, &_lazyPointer),
_fixup2(0, ld::Fixup::k2of2, ld::Fixup::kindStorePPCAbsHigh16AddLow),
_fixup3(4, ld::Fixup::k1of2, ld::Fixup::kindSetTargetAddress, &_lazyPointer),
_fixup4(4, ld::Fixup::k2of2, for64 ? ld::Fixup::kindStorePPCAbsLow14 : ld::Fixup::kindStorePPCAbsLow16),
_for64(for64)
{ pass.addAtom(*this); }
virtual const ld::File* file() const { return _stubTo.file(); }
virtual bool translationUnitSource(const char** dir, const char** ) const
{ return false; }
virtual const char* name() const { return _stubTo.name(); }
virtual uint64_t size() const { return 16; }
virtual uint64_t objectAddress() const { return 0; }
virtual void copyRawContent(uint8_t buffer[]) const {
OSWriteBigInt32(&buffer[ 0], 0, 0x3d600000); // lis r11,ha16(L_foo$lazy_ptr)
if ( _for64 )
OSWriteBigInt32(&buffer[ 4], 0, 0xe98b0001);// ldu r12,lo16(L_foo$lazy_ptr)(r11)
else
OSWriteBigInt32(&buffer[ 4], 0, 0x858b0000);// lwzu r12,lo16(L_foo$lazy_ptr)(r11)
OSWriteBigInt32(&buffer[ 8], 0, 0x7d8903a6); // mtctr r12
OSWriteBigInt32(&buffer[12], 0, 0x4e800420); // bctr
}
virtual void setScope(Scope) { }
virtual ld::Fixup::iterator fixupsBegin() const { return &_fixup1; }
virtual ld::Fixup::iterator fixupsEnd() const { return &((ld::Fixup*)&_fixup4)[1]; }
private:
const ld::Atom& _stubTo;
LazyPointerAtom _lazyPointer;
mutable ld::Fixup _fixup1;
mutable ld::Fixup _fixup2;
mutable ld::Fixup _fixup3;
mutable ld::Fixup _fixup4;
const bool _for64;
static ld::Section _s_section;
};
ld::Section StubNoPICAtom::_s_section("__TEXT", "__symbol_stub1", ld::Section::typeStub);
} // namespace classic
} // namespace ppc