/* -*- mode: C++; c-basic-offset: 4; tab-width: 4 -*-
*
* Copyright (c) 2009-2010 Apple Inc. All rights reserved.
*
* @APPLE_LICENSE_HEADER_START@
*
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* compliance with the License. Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this
* file.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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*/
// already in ld::passes::stubs namespace
namespace x86 {
class FastBindingPointerAtom : public ld::Atom {
public:
FastBindingPointerAtom(ld::passes::stubs::Pass& pass)
: ld::Atom(_s_section, ld::Atom::definitionRegular, ld::Atom::combineNever,
ld::Atom::scopeLinkageUnit, ld::Atom::typeNonLazyPointer,
symbolTableNotIn, false, false, false, ld::Atom::Alignment(2)),
_fixup(0, ld::Fixup::k1of1, ld::Fixup::kindStoreTargetAddressLittleEndian32,
pass.internal()->compressedFastBinderProxy)
{ pass.addAtom(*this); }
virtual const ld::File* file() const { return NULL; }
virtual bool translationUnitSource(const char** dir, const char** ) const
{ return false; }
virtual const char* name() const { return "fast binder pointer"; }
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 &_fixup; }
virtual ld::Fixup::iterator fixupsEnd() const { return &((ld::Fixup*)&_fixup)[1]; }
private:
mutable ld::Fixup _fixup;
static ld::Section _s_section;
};
ld::Section FastBindingPointerAtom::_s_section("__DATA", "__nl_symbol_ptr", ld::Section::typeNonLazyPointer);
class ImageCachePointerAtom : public ld::Atom {
public:
ImageCachePointerAtom(ld::passes::stubs::Pass& pass)
: ld::Atom(_s_section, ld::Atom::definitionRegular, ld::Atom::combineNever,
ld::Atom::scopeLinkageUnit, ld::Atom::typeNonLazyPointer,
symbolTableNotIn, false, false, false, ld::Atom::Alignment(2)) { pass.addAtom(*this); }
virtual const ld::File* file() const { return NULL; }
virtual bool translationUnitSource(const char** dir, const char** ) const
{ return false; }
virtual const char* name() const { return "image cache pointer"; }
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) { }
private:
static ld::Section _s_section;
};
ld::Section ImageCachePointerAtom::_s_section("__DATA", "__nl_symbol_ptr", ld::Section::typeNonLazyPointer);
//
// The stub-helper-helper is the common code factored out of each helper function.
// It is in the same section as the stub-helpers.
// Similar to the PLT0 entry in ELF.
//
class StubHelperHelperAtom : public ld::Atom {
public:
StubHelperHelperAtom(ld::passes::stubs::Pass& pass)
: ld::Atom(_s_section, ld::Atom::definitionRegular, ld::Atom::combineNever,
ld::Atom::scopeLinkageUnit, ld::Atom::typeStubHelper,
symbolTableNotIn, false, false, false, ld::Atom::Alignment(2)),
_fixup1(1, ld::Fixup::k1of1, ld::Fixup::kindStoreTargetAddressLittleEndian32, compressedImageCache(pass)),
_fixup2(7, ld::Fixup::k1of1, ld::Fixup::kindStoreTargetAddressLittleEndian32, compressedFastBinder(pass))
{ pass.addAtom(*this); }
virtual ld::File* file() const { return NULL; }
virtual bool translationUnitSource(const char** dir, const char** ) const
{ return false; }
virtual const char* name() const { return "helper helper"; }
virtual uint64_t size() const { return 12; }
virtual uint64_t objectAddress() const { return 0; }
virtual void copyRawContent(uint8_t buffer[]) const {
buffer[0] = 0x68; // pushl $dyld_ImageLoaderCache
buffer[1] = 0x00;
buffer[2] = 0x00;
buffer[3] = 0x00;
buffer[4] = 0x00;
buffer[5] = 0xFF; // jmp *_fast_lazy_bind
buffer[6] = 0x25;
buffer[7] = 0x00;
buffer[8] = 0x00;
buffer[9] = 0x00;
buffer[10] = 0x00;
buffer[11] = 0x90; // nop
}
virtual void setScope(Scope) { }
virtual ld::Fixup::iterator fixupsBegin() const { return &_fixup1; }
virtual ld::Fixup::iterator fixupsEnd() const { return &((ld::Fixup*)&_fixup2)[1]; }
private:
static ld::Atom* compressedImageCache(ld::passes::stubs::Pass& pass) {
if ( pass.compressedImageCache == NULL )
pass.compressedImageCache = new ImageCachePointerAtom(pass);
return pass.compressedImageCache;
}
static ld::Atom* compressedFastBinder(ld::passes::stubs::Pass& pass) {
if ( pass.compressedFastBinderPointer == NULL )
pass.compressedFastBinderPointer = new FastBindingPointerAtom(pass);
return pass.compressedFastBinderPointer;
}
mutable ld::Fixup _fixup1;
ld::Fixup _fixup2;
static ld::Section _s_section;
};
ld::Section StubHelperHelperAtom::_s_section("__TEXT", "__stub_helper", ld::Section::typeStubHelper);
class StubHelperAtom : public ld::Atom {
public:
StubHelperAtom(ld::passes::stubs::Pass& pass, const ld::Atom* lazyPointer,
const ld::Atom& stubTo)
: ld::Atom(_s_section, ld::Atom::definitionRegular, ld::Atom::combineNever,
ld::Atom::scopeLinkageUnit, ld::Atom::typeStubHelper,
symbolTableNotIn, false, false, false, ld::Atom::Alignment(1)),
_stubTo(stubTo),
_fixup1(1, ld::Fixup::k1of2, ld::Fixup::kindSetLazyOffset, lazyPointer),
_fixup2(1, ld::Fixup::k2of2, ld::Fixup::kindStoreLittleEndian32),
_fixup3(6, ld::Fixup::k1of1, ld::Fixup::kindStoreTargetAddressX86BranchPCRel32, helperHelper(pass)) { }
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 10; }
virtual uint64_t objectAddress() const { return 0; }
virtual void copyRawContent(uint8_t buffer[]) const {
buffer[0] = 0x68; // pushl $lazy-info-offset
buffer[1] = 0x00;
buffer[2] = 0x00;
buffer[3] = 0x00;
buffer[4] = 0x00;
buffer[5] = 0xE9; // jmp helperhelper
buffer[6] = 0x00;
buffer[7] = 0x00;
buffer[8] = 0x00;
buffer[9] = 0x00;
}
virtual void setScope(Scope) { }
virtual ld::Fixup::iterator fixupsBegin() const { return &_fixup1; }
virtual ld::Fixup::iterator fixupsEnd() const { return &((ld::Fixup*)&_fixup3)[1]; }
private:
static ld::Atom* helperHelper(ld::passes::stubs::Pass& pass) {
if ( pass.compressedHelperHelper == NULL )
pass.compressedHelperHelper = new StubHelperHelperAtom(pass);
return pass.compressedHelperHelper;
}
const ld::Atom& _stubTo;
mutable ld::Fixup _fixup1;
ld::Fixup _fixup2;
ld::Fixup _fixup3;
static ld::Section _s_section;
};
ld::Section StubHelperAtom::_s_section("__TEXT", "__stub_helper", ld::Section::typeStubHelper);
class ResolverHelperAtom : public ld::Atom {
public:
ResolverHelperAtom(ld::passes::stubs::Pass& pass, const ld::Atom* lazyPointer,
const ld::Atom& stubTo)
: ld::Atom(_s_section, ld::Atom::definitionRegular, ld::Atom::combineNever,
ld::Atom::scopeLinkageUnit, ld::Atom::typeStubHelper,
symbolTableNotIn, false, false, false, ld::Atom::Alignment(1)),
_stubTo(stubTo),
_fixup1(4, ld::Fixup::k1of1, ld::Fixup::kindStoreTargetAddressX86BranchPCRel32, &stubTo),
_fixup2(9, ld::Fixup::k1of1, ld::Fixup::kindStoreTargetAddressLittleEndian32, lazyPointer),
_fixup3(18, ld::Fixup::k1of1, ld::Fixup::kindStoreTargetAddressLittleEndian32, lazyPointer) { }
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 22; }
virtual uint64_t objectAddress() const { return 0; }
virtual void copyRawContent(uint8_t buffer[]) const {
buffer[ 0] = 0x50; // push %eax
buffer[ 1] = 0x51; // push %ecx
buffer[ 2] = 0x52; // push %edx
buffer[ 3] = 0xE8; // call foo
buffer[ 4] = 0x00;
buffer[ 5] = 0x00;
buffer[ 6] = 0x00;
buffer[ 7] = 0x00;
buffer[ 8] = 0xA3; // movl %eax,foo$lazy_ptr
buffer[ 9] = 0x00;
buffer[10] = 0x00;
buffer[11] = 0x00;
buffer[12] = 0x00;
buffer[13] = 0x5A; // pop %edx
buffer[14] = 0x59; // pop %ecx
buffer[15] = 0x58; // pop %eax
buffer[16] = 0xFF; // jmp *foo$lazy_ptr
buffer[17] = 0x25;
buffer[18] = 0x00;
buffer[19] = 0x00;
buffer[20] = 0x00;
buffer[21] = 0x00;
}
virtual void setScope(Scope) { }
virtual ld::Fixup::iterator fixupsBegin() const { return &_fixup1; }
virtual ld::Fixup::iterator fixupsEnd() const { return &((ld::Fixup*)&_fixup3)[1]; }
private:
const ld::Atom& _stubTo;
mutable ld::Fixup _fixup1;
ld::Fixup _fixup2;
ld::Fixup _fixup3;
static ld::Section _s_section;
};
ld::Section ResolverHelperAtom::_s_section("__TEXT", "__stub_helper", ld::Section::typeStubHelper);
class LazyPointerAtom : public ld::Atom {
public:
LazyPointerAtom(ld::passes::stubs::Pass& pass, const ld::Atom& stubTo,
bool stubToGlobalWeakDef, bool stubToResolver, bool weakImport)
: ld::Atom(_s_section, ld::Atom::definitionRegular, ld::Atom::combineNever,
ld::Atom::scopeTranslationUnit, ld::Atom::typeLazyPointer,
symbolTableNotIn, false, false, false, ld::Atom::Alignment(2)),
_stubTo(stubTo),
_helper(pass, this, stubTo),
_resolverHelper(pass, this, stubTo),
_fixup1(0, ld::Fixup::k1of1, ld::Fixup::kindStoreTargetAddressLittleEndian32,
stubToResolver ? &_resolverHelper : (stubToGlobalWeakDef ? &stubTo : &_helper)),
_fixup2(0, ld::Fixup::k1of1, ld::Fixup::kindLazyTarget, &stubTo) {
_fixup2.weakImport = weakImport; pass.addAtom(*this);
if ( stubToResolver )
pass.addAtom(_resolverHelper);
else if ( !stubToGlobalWeakDef )
pass.addAtom(_helper);
}
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 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;
StubHelperAtom _helper;
ResolverHelperAtom _resolverHelper;
mutable ld::Fixup _fixup1;
ld::Fixup _fixup2;
static ld::Section _s_section;
};
ld::Section LazyPointerAtom::_s_section("__DATA", "__la_symbol_ptr", ld::Section::typeLazyPointer);
class StubAtom : public ld::Atom {
public:
StubAtom(ld::passes::stubs::Pass& pass, const ld::Atom& stubTo,
bool stubToGlobalWeakDef, bool stubToResolver, 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(1)),
_stubTo(stubTo),
_lazyPointer(pass, stubTo, stubToGlobalWeakDef, stubToResolver, weakImport),
_fixup(2, 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** ) const
{ return false; }
virtual const char* name() const { return _stubTo.name(); }
virtual uint64_t size() const { return 6; }
virtual uint64_t objectAddress() const { return 0; }
virtual void copyRawContent(uint8_t buffer[]) const {
buffer[0] = 0xFF; // jmp *foo$lazy_pointer
buffer[1] = 0x25;
buffer[2] = 0x00;
buffer[3] = 0x00;
buffer[4] = 0x00;
buffer[5] = 0x00;
}
virtual void setScope(Scope) { }
virtual ld::Fixup::iterator fixupsBegin() const { return &_fixup; }
virtual ld::Fixup::iterator fixupsEnd() const { return &((ld::Fixup*)&_fixup)[1]; }
private:
const ld::Atom& _stubTo;
LazyPointerAtom _lazyPointer;
mutable ld::Fixup _fixup;
static ld::Section _s_section;
};
ld::Section StubAtom::_s_section("__TEXT", "__symbol_stub", ld::Section::typeStub);
} // namespace x86