[apple/ld64.git] / src / ld / passes / stubs / stub_arm_classic.hpp

/* -*- mode: C++; c-basic-offset: 4; tab-width: 4 -*-
 *
 * Copyright (c) 2009 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
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 *
 * @APPLE_LICENSE_HEADER_END@
 */

// 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 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 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 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
Commit	Line	Data
a645023d A	1	/* -- mode: C++; c-basic-offset: 4; tab-width: 4 --
	2	*
	3	* Copyright (c) 2009 Apple Inc. All rights reserved.
	4	*
	5	* @APPLE_LICENSE_HEADER_START@
	6	*
	7	* This file contains Original Code and/or Modifications of Original Code
	8	* as defined in and that are subject to the Apple Public Source License
	9	* Version 2.0 (the 'License'). You may not use this file except in
	10	* compliance with the License. Please obtain a copy of the License at
	11	* http://www.opensource.apple.com/apsl/ and read it before using this
	12	* file.
	13	*
	14	* The Original Code and all software distributed under the License are
	15	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	16	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	17	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	18	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	19	* Please see the License for the specific language governing rights and
	20	* limitations under the License.
	21	*
	22	* @APPLE_LICENSE_HEADER_END@
	23	*/
	24
	25	// already in ld::passes::stubs namespace
	26	namespace arm {
	27	namespace classic {
	28
	29
	30	class LazyPointerAtom : public ld::Atom {
	31	public:
	32	LazyPointerAtom(ld::passes::stubs::Pass& pass, const ld::Atom& stubTo,
	33	bool forLazyDylib, bool weakImport)
	34	: ld::Atom(forLazyDylib ? _s_sectionLazy : _s_section, ld::Atom::definitionRegular,
	35	ld::Atom::combineNever, ld::Atom::scopeLinkageUnit, ld::Atom::typeLazyPointer,
	36	symbolTableNotIn, false, false, false, ld::Atom::Alignment(2)),
	37	_stubTo(stubTo),
	38	_fixup1(0, ld::Fixup::k1of1, ld::Fixup::kindStoreTargetAddressLittleEndian32,
	39	forLazyDylib ? pass.internal()->lazyBindingHelper : pass.internal()->classicBindingHelper),
	40	_fixup2(0, ld::Fixup::k1of1, ld::Fixup::kindLazyTarget, &stubTo)
	41	{ _fixup2.weakImport = weakImport; pass.addAtom(*this); }
	42
	43	virtual const ld::File* file() const { return _stubTo.file(); }
a645023d A	44	virtual const char* name() const { return _stubTo.name(); }
	45	virtual uint64_t size() const { return 4; }
	46	virtual uint64_t objectAddress() const { return 0; }
	47	virtual void copyRawContent(uint8_t buffer[]) const { }
	48	virtual void setScope(Scope) { }
	49	virtual ld::Fixup::iterator fixupsBegin() const { return (ld::Fixup*)&_fixup1; }
	50	virtual ld::Fixup::iterator fixupsEnd() const { return &((ld::Fixup*)&_fixup2)[1]; }
	51
	52	private:
	53	const ld::Atom& _stubTo;
	54	ld::Fixup _fixup1;
	55	ld::Fixup _fixup2;
	56
	57	static ld::Section _s_section;
	58	static ld::Section _s_sectionLazy;
	59	};
	60
	61	ld::Section LazyPointerAtom::_s_section("__DATA", "__la_symbol_ptr", ld::Section::typeLazyPointer);
	62	ld::Section LazyPointerAtom::_s_sectionLazy("__DATA", "__ld_symbol_ptr", ld::Section::typeLazyDylibPointer);
	63
	64
	65	class StubPICAtom : public ld::Atom {
	66	public:
	67	StubPICAtom(ld::passes::stubs::Pass& pass, const ld::Atom& stubTo,
	68	bool forLazyDylib, bool weakImport)
	69	: ld::Atom(_s_section, ld::Atom::definitionRegular, ld::Atom::combineNever,
	70	ld::Atom::scopeLinkageUnit, ld::Atom::typeStub,
	71	symbolTableNotIn, false, false, false, ld::Atom::Alignment(2)),
	72	_stubTo(stubTo),
	73	_lazyPointer(pass, stubTo, forLazyDylib, weakImport),
	74	_fixup1(12, ld::Fixup::k1of4, ld::Fixup::kindSetTargetAddress, &_lazyPointer),
	75	_fixup2(12, ld::Fixup::k2of4, ld::Fixup::kindSubtractTargetAddress, this),
	76	_fixup3(12, ld::Fixup::k3of4, ld::Fixup::kindSubtractAddend, 12),
	77	_fixup4(12, ld::Fixup::k4of4, ld::Fixup::kindStoreLittleEndian32)
	78	{ pass.addAtom(*this); }
	79
	80	virtual const ld::File* file() const { return _stubTo.file(); }
a645023d A	81	virtual const char* name() const { return _stubTo.name(); }
	82	virtual uint64_t size() const { return 16; }
	83	virtual uint64_t objectAddress() const { return 0; }
	84	virtual void copyRawContent(uint8_t buffer[]) const {
	85	OSWriteLittleInt32(&buffer[ 0], 0, 0xe59fc004); // ldr ip, pc + 12
	86	OSWriteLittleInt32(&buffer[ 4], 0, 0xe08fc00c); // add ip, pc, ip
	87	OSWriteLittleInt32(&buffer[ 8], 0, 0xe59cf000); // ldr pc, [ip]
	88	OSWriteLittleInt32(&buffer[12], 0, 0x00000000); // .long L_foo$lazy_ptr - (L1$scv + 8)
	89	}
	90	virtual void setScope(Scope) { }
	91	virtual ld::Fixup::iterator fixupsBegin() const { return (ld::Fixup*)&_fixup1; }
	92	virtual ld::Fixup::iterator fixupsEnd() const { return &((ld::Fixup*)&_fixup4)[1]; }
	93
	94	private:
	95	const ld::Atom& _stubTo;
	96	LazyPointerAtom _lazyPointer;
	97	ld::Fixup _fixup1;
	98	ld::Fixup _fixup2;
	99	ld::Fixup _fixup3;
	100	ld::Fixup _fixup4;
	101
	102	static ld::Section _s_section;
	103	};
	104
	105	ld::Section StubPICAtom::_s_section("__TEXT", "__picsymbolstub4", ld::Section::typeStub);
	106
	107
	108
	109	class StubNoPICAtom : public ld::Atom {
	110	public:
	111	StubNoPICAtom(ld::passes::stubs::Pass& pass, const ld::Atom& stubTo,
	112	bool forLazyDylib, bool weakImport)
	113	: ld::Atom(_s_section, ld::Atom::definitionRegular, ld::Atom::combineNever,
	114	ld::Atom::scopeLinkageUnit, ld::Atom::typeStub,
	115	symbolTableNotIn, false, false, false, ld::Atom::Alignment(2)),
	116	_stubTo(stubTo),
	117	_lazyPointer(pass, stubTo, forLazyDylib, weakImport),
	118	_fixup(8, ld::Fixup::k1of1, ld::Fixup::kindStoreTargetAddressLittleEndian32, &_lazyPointer)
	119	{ pass.addAtom(*this); }
	120
	121	virtual const ld::File* file() const { return _stubTo.file(); }
a645023d A	122	virtual const char* name() const { return _stubTo.name(); }
	123	virtual uint64_t size() const { return 12; }
	124	virtual uint64_t objectAddress() const { return 0; }
	125	virtual void copyRawContent(uint8_t buffer[]) const {
	126	OSWriteLittleInt32(&buffer[ 0], 0, 0xe59fc000); // ldr ip, [pc, #0]
	127	OSWriteLittleInt32(&buffer[ 4], 0, 0xe59cf000); // ldr pc, [ip]
	128	OSWriteLittleInt32(&buffer[ 8], 0, 0x00000000); // .long L_foo$lazy_ptr
	129	}
	130	virtual void setScope(Scope) { }
	131	virtual ld::Fixup::iterator fixupsBegin() const { return (ld::Fixup*)&_fixup; }
	132	virtual ld::Fixup::iterator fixupsEnd() const { return &((ld::Fixup*)&_fixup)[1]; }
	133
	134	private:
	135	const ld::Atom& _stubTo;
	136	LazyPointerAtom _lazyPointer;
	137	ld::Fixup _fixup;
	138
	139	static ld::Section _s_section;
	140	};
	141
	142	ld::Section StubNoPICAtom::_s_section("__TEXT", "__symbol_stub4", ld::Section::typeStub);
	143
	144
	145
	146
	147	} // namespace classic
	148	} // namespace arm
	149