Nick Kledzik | abb6981 | 2012-05-31 22:34:00 +0000 | [diff] [blame] | 1 | //===- lib/ReaderWriter/ELF/WriterELF.cpp ---------------------------------===// |
| 2 | // |
| 3 | // The LLVM Linker |
| 4 | // |
| 5 | // This file is distributed under the University of Illinois Open Source |
| 6 | // License. See LICENSE.TXT for details. |
| 7 | // |
| 8 | //===----------------------------------------------------------------------===// |
| 9 | |
| 10 | #include "lld/ReaderWriter/WriterELF.h" |
Hemant Kulkarni | 927bbc2 | 2012-09-14 16:11:34 +0000 | [diff] [blame] | 11 | #include "ReferenceKinds.h" |
Nick Kledzik | abb6981 | 2012-05-31 22:34:00 +0000 | [diff] [blame] | 12 | |
Hemant Kulkarni | 927bbc2 | 2012-09-14 16:11:34 +0000 | [diff] [blame] | 13 | #include "lld/Core/DefinedAtom.h" |
| 14 | #include "lld/Core/File.h" |
| 15 | #include "lld/Core/InputFiles.h" |
| 16 | #include "lld/Core/Reference.h" |
| 17 | #include "lld/Core/SharedLibraryAtom.h" |
Hemant Kulkarni | 927bbc2 | 2012-09-14 16:11:34 +0000 | [diff] [blame] | 18 | #include "llvm/ADT/ArrayRef.h" |
| 19 | #include "llvm/ADT/DenseMap.h" |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 20 | #include "llvm/ADT/Hashing.h" |
Hemant Kulkarni | 927bbc2 | 2012-09-14 16:11:34 +0000 | [diff] [blame] | 21 | #include "llvm/ADT/OwningPtr.h" |
| 22 | #include "llvm/ADT/SmallVector.h" |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 23 | #include "llvm/ADT/StringExtras.h" |
Hemant Kulkarni | 927bbc2 | 2012-09-14 16:11:34 +0000 | [diff] [blame] | 24 | #include "llvm/ADT/StringMap.h" |
| 25 | #include "llvm/ADT/StringRef.h" |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 26 | #include "llvm/ADT/StringSwitch.h" |
Hemant Kulkarni | 927bbc2 | 2012-09-14 16:11:34 +0000 | [diff] [blame] | 27 | #include "llvm/Object/ELF.h" |
Hemant Kulkarni | 927bbc2 | 2012-09-14 16:11:34 +0000 | [diff] [blame] | 28 | #include "llvm/Support/Allocator.h" |
Nick Kledzik | abb6981 | 2012-05-31 22:34:00 +0000 | [diff] [blame] | 29 | #include "llvm/Support/Debug.h" |
Hemant Kulkarni | 927bbc2 | 2012-09-14 16:11:34 +0000 | [diff] [blame] | 30 | #include "llvm/Support/ELF.h" |
| 31 | #include "llvm/Support/ErrorHandling.h" |
| 32 | #include "llvm/Support/FileOutputBuffer.h" |
| 33 | #include "llvm/Support/Format.h" |
| 34 | #include "llvm/Support/MathExtras.h" |
| 35 | #include "llvm/Support/raw_ostream.h" |
| 36 | #include "llvm/Support/system_error.h" |
Shankar Easwaran | 2ca8e7d | 2013-01-10 03:16:27 +0000 | [diff] [blame] | 37 | #include "ExecutableAtoms.h" |
Nick Kledzik | abb6981 | 2012-05-31 22:34:00 +0000 | [diff] [blame] | 38 | |
Hemant Kulkarni | 927bbc2 | 2012-09-14 16:11:34 +0000 | [diff] [blame] | 39 | #include <map> |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 40 | #include <unordered_map> |
Hemant Kulkarni | 927bbc2 | 2012-09-14 16:11:34 +0000 | [diff] [blame] | 41 | #include <tuple> |
| 42 | #include <vector> |
Nick Kledzik | abb6981 | 2012-05-31 22:34:00 +0000 | [diff] [blame] | 43 | |
Hemant Kulkarni | 927bbc2 | 2012-09-14 16:11:34 +0000 | [diff] [blame] | 44 | using namespace llvm; |
| 45 | using namespace llvm::object; |
Nick Kledzik | abb6981 | 2012-05-31 22:34:00 +0000 | [diff] [blame] | 46 | namespace lld { |
| 47 | namespace elf { |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 48 | template<support::endianness target_endianness, |
| 49 | std::size_t max_align, |
| 50 | bool is64Bits> |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 51 | class ELFExecutableWriter; |
Hemant Kulkarni | 87dbac0 | 2012-11-13 21:34:45 +0000 | [diff] [blame] | 52 | |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 53 | /// \brief The ELFWriter class is a base class for the linker to write |
| 54 | /// various kinds of ELF files. |
| 55 | class ELFWriter : public Writer { |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 56 | public: |
| 57 | ELFWriter() { } |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 58 | |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 59 | public: |
| 60 | /// \brief builds the chunks that needs to be written to the output |
| 61 | /// ELF file |
| 62 | virtual void buildChunks(const lld::File &file) = 0; |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 63 | |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 64 | /// \brief Writes the chunks into the output file specified by path |
| 65 | virtual error_code writeFile(const lld::File &File, StringRef path) = 0; |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 66 | |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 67 | /// \brief Writes the chunks into the output file specified by path |
| 68 | virtual uint64_t addressOfAtom(const Atom *atom) = 0; |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 69 | |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 70 | /// \brief Return the processing function to apply Relocations |
| 71 | virtual KindHandler *kindHandler() = 0; |
Hemant Kulkarni | 87dbac0 | 2012-11-13 21:34:45 +0000 | [diff] [blame] | 72 | }; |
| 73 | |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 74 | /// \brief A chunk is a contiguous region of space |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 75 | template<support::endianness target_endianness, |
| 76 | std::size_t max_align, |
| 77 | bool is64Bits> |
Hemant Kulkarni | 927bbc2 | 2012-09-14 16:11:34 +0000 | [diff] [blame] | 78 | class Chunk { |
| 79 | public: |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 80 | |
| 81 | /// \brief Describes the type of Chunk |
| 82 | enum Kind { |
| 83 | K_ELFHeader, // ELF Header |
| 84 | K_ELFProgramHeader, // Program Header |
| 85 | K_ELFSegment, // Segment |
| 86 | K_ELFSection, // Section |
| 87 | K_ELFSectionHeader // Section header |
Hemant Kulkarni | 87dbac0 | 2012-11-13 21:34:45 +0000 | [diff] [blame] | 88 | }; |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 89 | Chunk(StringRef name, Kind kind) |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 90 | : _name(name) |
| 91 | , _kind(kind) |
| 92 | , _fsize(0) |
| 93 | , _msize(0) |
| 94 | , _align2(0) |
| 95 | , _order(0) |
| 96 | , _ordinal(1) |
| 97 | , _start(0) |
| 98 | , _fileoffset(0) {} |
| 99 | virtual ~Chunk() {} |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 100 | // Does the chunk occupy disk space |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 101 | virtual bool occupiesNoDiskSpace() const { |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 102 | return false; |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 103 | } |
| 104 | // The name of the chunk |
| 105 | StringRef name() const { return _name; } |
| 106 | // Kind of chunk |
| 107 | Kind kind() const { return _kind; } |
| 108 | uint64_t fileSize() const { return _fsize; } |
| 109 | uint64_t align2() const { return _align2; } |
| 110 | void appendAtom() const; |
| 111 | |
| 112 | // The ordinal value of the chunk |
| 113 | uint64_t ordinal() const { return _ordinal;} |
| 114 | void setOrdinal(uint64_t newVal) { _ordinal = newVal;} |
| 115 | // The order in which the chunk would appear in the output file |
| 116 | uint64_t order() const { return _order; } |
| 117 | void setOrder(uint32_t order) { _order = order; } |
| 118 | // Output file offset of the chunk |
| 119 | uint64_t fileOffset() const { return _fileoffset; } |
| 120 | void setFileOffset(uint64_t offset) { _fileoffset = offset; } |
| 121 | // Output start address of the chunk |
| 122 | void setVAddr(uint64_t start) { _start = start; } |
| 123 | uint64_t virtualAddr() const { return _start; } |
| 124 | // Does the chunk occupy memory during execution ? |
| 125 | uint64_t memSize() const { return _msize; } |
| 126 | void setMemSize(uint64_t msize) { _msize = msize; } |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 127 | // Writer the chunk |
| 128 | virtual void write(ELFWriter *writer, |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 129 | OwningPtr<FileOutputBuffer> &buffer) = 0; |
| 130 | // Finalize the chunk before writing |
| 131 | virtual void finalize() = 0; |
| 132 | |
Hemant Kulkarni | 927bbc2 | 2012-09-14 16:11:34 +0000 | [diff] [blame] | 133 | protected: |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 134 | StringRef _name; |
| 135 | Kind _kind; |
| 136 | uint64_t _fsize; |
| 137 | uint64_t _msize; |
Hemant Kulkarni | 927bbc2 | 2012-09-14 16:11:34 +0000 | [diff] [blame] | 138 | uint64_t _align2; |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 139 | uint32_t _order; |
Hemant Kulkarni | 08e41029 | 2012-10-01 23:53:20 +0000 | [diff] [blame] | 140 | uint64_t _ordinal; |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 141 | uint64_t _start; |
| 142 | uint64_t _fileoffset; |
Hemant Kulkarni | 927bbc2 | 2012-09-14 16:11:34 +0000 | [diff] [blame] | 143 | }; |
| 144 | |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 145 | /// \brief The ELFLayoutOptions encapsulates the options used by all Layouts |
| 146 | /// Examples of the ELFLayoutOptions would be a script that would be used |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 147 | /// to drive the layout |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 148 | class ELFLayoutOptions { |
Hemant Kulkarni | 927bbc2 | 2012-09-14 16:11:34 +0000 | [diff] [blame] | 149 | public: |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 150 | ELFLayoutOptions() { } |
Hemant Kulkarni | 927bbc2 | 2012-09-14 16:11:34 +0000 | [diff] [blame] | 151 | |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 152 | ELFLayoutOptions(StringRef &linker_script) : _script(linker_script) |
| 153 | {} |
Hemant Kulkarni | 87dbac0 | 2012-11-13 21:34:45 +0000 | [diff] [blame] | 154 | |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 155 | /// parse the linker script |
| 156 | error_code parseLinkerScript(); |
Hemant Kulkarni | 736f7fb | 2012-11-21 21:07:36 +0000 | [diff] [blame] | 157 | |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 158 | /// Is the current section present in the linker script |
| 159 | bool isSectionPresent(); |
| 160 | |
Hemant Kulkarni | 08e41029 | 2012-10-01 23:53:20 +0000 | [diff] [blame] | 161 | private: |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 162 | StringRef _script; |
Hemant Kulkarni | 08e41029 | 2012-10-01 23:53:20 +0000 | [diff] [blame] | 163 | }; |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 164 | |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 165 | /// \brief The ELFLayout is an abstract class for managing the final layout for |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 166 | /// the kind of binaries(Shared Libraries / Relocatables / Executables 0 |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 167 | /// Each architecture (Hexagon, PowerPC, MIPS) would have a concrete |
| 168 | /// subclass derived from ELFLayout for generating each binary thats |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 169 | // needed by the lld linker |
| 170 | class ELFLayout { |
| 171 | public: |
| 172 | typedef uint32_t SectionOrder; |
| 173 | typedef uint32_t SegmentType; |
| 174 | typedef uint32_t Flags; |
| 175 | |
| 176 | public: |
| 177 | /// Return the order the section would appear in the output file |
| 178 | virtual SectionOrder getSectionOrder |
| 179 | (const StringRef name, |
| 180 | int32_t contentType, |
| 181 | int32_t contentPerm) = 0; |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 182 | /// append the Atom to the layout and create appropriate sections |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 183 | virtual error_code addAtom(const Atom *atom) = 0; |
| 184 | /// find the Atom Address in the current layout |
| 185 | virtual bool findAtomAddrByName(const StringRef name, uint64_t &addr) = 0; |
| 186 | /// associates a section to a segment |
| 187 | virtual void assignSectionsToSegments() = 0; |
| 188 | /// associates a virtual address to the segment, section, and the atom |
| 189 | virtual void assignVirtualAddress() = 0; |
| 190 | /// associates a file offset to the segment, section and the atom |
| 191 | virtual void assignFileOffsets() = 0; |
| 192 | |
| 193 | public: |
| 194 | ELFLayout() {} |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 195 | ELFLayout(WriterOptionsELF &writerOptions, |
| 196 | ELFLayoutOptions &layoutOptions) |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 197 | : _writerOptions(writerOptions) |
| 198 | , _layoutOptions(layoutOptions) {} |
| 199 | virtual ~ELFLayout() { } |
| 200 | |
| 201 | private: |
| 202 | WriterOptionsELF _writerOptions; |
| 203 | ELFLayoutOptions _layoutOptions; |
| 204 | }; |
| 205 | |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 206 | /// \brief A section contains a set of atoms that have similiar properties |
| 207 | /// The atoms that have similiar properties are merged to form a section |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 208 | template<support::endianness target_endianness, |
| 209 | std::size_t max_align, |
| 210 | bool is64Bits> |
| 211 | class Section : public Chunk<target_endianness, max_align, is64Bits> { |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 212 | public: |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 213 | // The Kind of section that the object represents |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 214 | enum SectionKind { |
| 215 | K_Default, |
| 216 | K_SymbolTable, |
| 217 | K_StringTable, |
| 218 | }; |
| 219 | // Create a section object, the section is set to the default type if the |
| 220 | // caller doesnot set it |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 221 | Section(const StringRef sectionName, |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 222 | const int32_t contentType, |
| 223 | const int32_t contentPermissions, |
| 224 | const int32_t order, |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 225 | const SectionKind kind = K_Default) |
| 226 | : Chunk<target_endianness, max_align, is64Bits>( |
| 227 | sectionName, Chunk<target_endianness, max_align, is64Bits>::K_ELFSection) |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 228 | , _contentType(contentType) |
| 229 | , _contentPermissions(contentPermissions) |
| 230 | , _sectionKind(kind) |
| 231 | , _entSize(0) |
| 232 | , _shInfo(0) |
| 233 | , _link(0) { |
| 234 | this->setOrder(order); |
| 235 | } |
| 236 | |
| 237 | /// return the section kind |
| 238 | SectionKind sectionKind() const { |
| 239 | return _sectionKind; |
| 240 | } |
| 241 | |
| 242 | /// Align the offset to the required modulus defined by the atom alignment |
| 243 | uint64_t alignOffset(uint64_t offset, DefinedAtom::Alignment &atomAlign) { |
| 244 | uint64_t requiredModulus = atomAlign.modulus; |
| 245 | uint64_t align2 = 1u << atomAlign.powerOf2; |
| 246 | uint64_t currentModulus = (offset % align2); |
| 247 | uint64_t retOffset = offset; |
| 248 | if (currentModulus != requiredModulus) { |
| 249 | if (requiredModulus > currentModulus) |
| 250 | retOffset += requiredModulus - currentModulus; |
| 251 | else |
| 252 | retOffset += align2 + requiredModulus - currentModulus; |
| 253 | } |
| 254 | return retOffset; |
| 255 | } |
| 256 | |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 257 | // \brief Append an atom to a Section. The atom gets pushed into a vector |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 258 | // contains the atom, the atom file offset, the atom virtual address |
| 259 | // the atom file offset is aligned appropriately as set by the Reader |
| 260 | void appendAtom(const Atom *atom) { |
| 261 | Atom::Definition atomType = atom->definition(); |
| 262 | const DefinedAtom *definedAtom = dyn_cast<DefinedAtom>(atom); |
| 263 | assert(atom != nullptr && "Expecting the atom to be a DefinedAtom"); |
| 264 | DefinedAtom::Alignment atomAlign = definedAtom->alignment(); |
| 265 | uint64_t align2 = 1u << atomAlign.powerOf2; |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 266 | // Align the atom to the required modulus/ align the file offset and the |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 267 | // memory offset seperately this is required so that BSS symbols are handled |
| 268 | // properly as the BSS symbols only occupy memory size and not file size |
| 269 | uint64_t fOffset = alignOffset(this->fileSize(), atomAlign); |
| 270 | uint64_t mOffset = alignOffset(this->memSize(), atomAlign); |
| 271 | switch (atomType) { |
| 272 | case Atom::definitionRegular: |
| 273 | switch(definedAtom->contentType()) { |
| 274 | case DefinedAtom::typeCode: |
| 275 | case DefinedAtom::typeData: |
Michael J. Spencer | 8de8364 | 2013-01-07 08:00:42 +0000 | [diff] [blame] | 276 | case DefinedAtom::typeConstant: |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 277 | _atoms.push_back(std::make_pair(atom, std::make_pair(fOffset, 0))); |
| 278 | this->_fsize = fOffset + definedAtom->size(); |
| 279 | this->_msize = mOffset + definedAtom->size(); |
| 280 | break; |
| 281 | case DefinedAtom::typeZeroFill: |
| 282 | _atoms.push_back(std::make_pair(atom, std::make_pair(mOffset, 0))); |
| 283 | this->_msize = mOffset + definedAtom->size(); |
| 284 | break; |
| 285 | default: |
| 286 | this->_fsize = fOffset + definedAtom->size(); |
| 287 | this->_msize = mOffset + definedAtom->size(); |
| 288 | break; |
| 289 | } |
| 290 | break; |
| 291 | default: |
| 292 | llvm_unreachable("Expecting only definedAtoms being passed here"); |
| 293 | break; |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 294 | } |
| 295 | // Set the section alignment to the largest alignment |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 296 | // std::max doesnot support uint64_t |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 297 | if (this->_align2 < align2) |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 298 | this->_align2 = align2; |
| 299 | } |
| 300 | |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 301 | /// \brief Set the virtual address of each Atom in the Section. This |
| 302 | /// routine gets called after the linker fixes up the virtual address |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 303 | /// of the section |
| 304 | void assignVirtualAddress(uint64_t &addr) { |
| 305 | for (auto &ai : _atoms) { |
| 306 | ai.second.second = addr + ai.second.first; |
| 307 | } |
| 308 | addr += this->memSize(); |
| 309 | } |
| 310 | |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 311 | /// \brief Set the file offset of each Atom in the section. This routine |
| 312 | /// gets called after the linker fixes up the section offset |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 313 | void assignOffsets(uint64_t offset) { |
| 314 | for (auto &ai : _atoms) { |
| 315 | ai.second.first = offset + ai.second.first; |
| 316 | } |
| 317 | } |
| 318 | |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 319 | /// \brief Find the Atom address given a name, this is needed to to properly |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 320 | /// apply relocation. The section class calls this to find the atom address |
| 321 | /// to fix the relocation |
| 322 | bool findAtomAddrByName(const StringRef name, uint64_t &addr) { |
| 323 | for (auto ai : _atoms) { |
| 324 | if (ai.first->name() == name) { |
| 325 | addr = ai.second.second; |
| 326 | return true; |
| 327 | } |
| 328 | } |
| 329 | return false; |
| 330 | } |
| 331 | |
| 332 | /// \brief Does the Atom occupy any disk space |
| 333 | bool occupiesNoDiskSpace() const { |
| 334 | return _contentType == DefinedAtom::typeZeroFill; |
| 335 | } |
| 336 | |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 337 | /// \brief The permission of the section is the most permissive permission |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 338 | /// of all atoms that the section contains |
| 339 | void setContentPermissions(int32_t perm) { |
| 340 | _contentPermissions = std::max(perm, _contentPermissions); |
| 341 | } |
| 342 | |
| 343 | /// \brief Get the section flags, defined by the permissions of the section |
| 344 | int64_t flags() { |
| 345 | switch (_contentPermissions) { |
| 346 | case DefinedAtom::perm___: |
| 347 | return 0; |
| 348 | |
| 349 | case DefinedAtom::permR__: |
| 350 | return llvm::ELF::SHF_ALLOC; |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 351 | |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 352 | case DefinedAtom::permR_X: |
| 353 | return llvm::ELF::SHF_ALLOC | llvm::ELF::SHF_EXECINSTR; |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 354 | |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 355 | case DefinedAtom::permRW_: |
| 356 | case DefinedAtom::permRW_L: |
| 357 | return llvm::ELF::SHF_ALLOC | llvm::ELF::SHF_WRITE; |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 358 | |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 359 | case DefinedAtom::permRWX: |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 360 | return llvm::ELF::SHF_ALLOC | |
| 361 | llvm::ELF::SHF_WRITE | |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 362 | llvm::ELF::SHF_EXECINSTR; |
| 363 | |
| 364 | default: |
| 365 | break; |
| 366 | } |
| 367 | return llvm::ELF::SHF_ALLOC; |
| 368 | } |
| 369 | |
| 370 | /// \brief Return the raw flags, we need this to sort segments |
| 371 | int64_t atomflags() const { |
| 372 | return _contentPermissions; |
| 373 | } |
| 374 | |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 375 | /// \brief Return the section type, the returned value is recorded in the |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 376 | /// sh_type field of the Section Header |
| 377 | int type() { |
| 378 | switch (_contentType) { |
| 379 | case DefinedAtom::typeCode: |
| 380 | case DefinedAtom::typeData: |
| 381 | case DefinedAtom::typeConstant: |
| 382 | return llvm::ELF::SHT_PROGBITS; |
| 383 | |
| 384 | case DefinedAtom::typeZeroFill: |
| 385 | return llvm::ELF::SHT_NOBITS; |
| 386 | |
| 387 | // Case to handle section types |
| 388 | // Symtab, String Table ... |
| 389 | default: |
| 390 | return _contentType; |
| 391 | } |
| 392 | } |
| 393 | |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 394 | /// \brief Returns the section link field, the returned value is |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 395 | /// recorded in the sh_link field of the Section Header |
| 396 | int link() const { |
| 397 | return _link; |
| 398 | } |
| 399 | |
| 400 | void setLink(int32_t link) { |
| 401 | _link = link; |
| 402 | } |
| 403 | |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 404 | /// \brief Returns the section entsize field, the returned value is |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 405 | /// recorded in the sh_entsize field of the Section Header |
| 406 | int entsize() const { |
| 407 | return _entSize; |
| 408 | } |
| 409 | |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 410 | /// \brief Returns the shinfo field, the returned value is |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 411 | /// recorded in the sh_info field of the Section Header |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 412 | int shinfo() const { |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 413 | return _shInfo; |
| 414 | } |
| 415 | |
| 416 | /// \brief Records the segmentType, that this section belongs to |
| 417 | void setSegment(const ELFLayout::SegmentType segmentType) { |
| 418 | _segmentType = segmentType; |
| 419 | } |
| 420 | |
| 421 | /// \brief convert the segment type to a String for diagnostics |
| 422 | /// and printing purposes |
| 423 | StringRef segmentKindToStr() const { |
| 424 | switch(_segmentType) { |
| 425 | case llvm::ELF::PT_INTERP: |
| 426 | return "INTERP"; |
| 427 | case llvm::ELF::PT_LOAD: |
| 428 | return "LOAD"; |
| 429 | case llvm::ELF::PT_GNU_EH_FRAME: |
| 430 | return "EH_FRAME"; |
| 431 | case llvm::ELF::PT_NOTE: |
| 432 | return "NOTE"; |
| 433 | case llvm::ELF::PT_DYNAMIC: |
| 434 | return "DYNAMIC"; |
| 435 | case llvm::ELF::PT_GNU_RELRO: |
| 436 | return "RELRO"; |
| 437 | case llvm::ELF::PT_NULL: |
| 438 | return "NULL"; |
| 439 | default: |
| 440 | return "UNKNOWN"; |
| 441 | } |
| 442 | } |
| 443 | |
| 444 | /// \brief for LLVM style RTTI information |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 445 | static inline bool classof( |
| 446 | const Chunk<target_endianness, max_align, is64Bits> *c) { |
| 447 | return c->kind() == |
| 448 | Chunk<target_endianness, max_align, is64Bits>::K_ELFSection; |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 449 | } |
| 450 | |
| 451 | /// \brief Finalize the section contents before writing |
| 452 | void finalize() { } |
| 453 | |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 454 | /// \brief Write the section and the atom contents to the buffer |
| 455 | void write(ELFWriter *writer, |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 456 | OwningPtr<FileOutputBuffer> &buffer) { |
| 457 | uint8_t *chunkBuffer = buffer->getBufferStart(); |
| 458 | for (auto &ai : _atoms) { |
| 459 | const DefinedAtom *definedAtom = llvm::dyn_cast<DefinedAtom>(ai.first); |
Michael J. Spencer | 8de8364 | 2013-01-07 08:00:42 +0000 | [diff] [blame] | 460 | if (definedAtom->contentType() == DefinedAtom::typeZeroFill) |
| 461 | continue; |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 462 | // Copy raw content of atom to file buffer. |
| 463 | ArrayRef<uint8_t> content = definedAtom->rawContent(); |
| 464 | uint64_t contentSize = content.size(); |
| 465 | if (contentSize == 0) |
| 466 | continue; |
| 467 | uint8_t *atomContent = chunkBuffer + ai.second.first; |
| 468 | std::copy_n(content.data(), contentSize, atomContent); |
| 469 | for (auto ref = definedAtom->begin(); ref != definedAtom->end(); ++ref) { |
| 470 | uint32_t offset = ref->offsetInAtom(); |
| 471 | uint64_t targetAddress = 0; |
| 472 | if (ref->target() != nullptr) |
| 473 | targetAddress = writer->addressOfAtom(ref->target()); |
| 474 | else |
| 475 | assert(0 && "Found the target to be NULL"); |
| 476 | uint64_t fixupAddress = writer->addressOfAtom(ai.first) + offset; |
| 477 | // apply the relocation |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 478 | writer->kindHandler()->applyFixup(ref->kind(), |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 479 | ref->addend(), |
| 480 | &atomContent[offset], |
| 481 | fixupAddress, |
| 482 | targetAddress); |
| 483 | } |
| 484 | } |
| 485 | } |
| 486 | |
| 487 | /// Atom Iterators |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 488 | typedef typename std::vector<std::pair<const Atom *, |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 489 | std::pair<uint64_t, uint64_t>>>::iterator atom_iter; |
| 490 | |
| 491 | atom_iter atoms_begin() { return _atoms.begin(); } |
| 492 | |
| 493 | atom_iter atoms_end() { return _atoms.end(); } |
| 494 | |
| 495 | protected: |
| 496 | int32_t _contentType; |
| 497 | int32_t _contentPermissions; |
| 498 | SectionKind _sectionKind; |
| 499 | // An Atom is appended to the vector with the following fields |
| 500 | // field1 : Atom |
| 501 | // field2 : fileoffset (initially set with a base offset of 0) |
| 502 | // field3 : virtual address |
| 503 | std::vector<std::pair<const Atom *, std::pair<uint64_t, uint64_t>>> _atoms; |
| 504 | ELFLayout::SegmentType _segmentType; |
| 505 | int64_t _entSize; |
| 506 | int64_t _shInfo; |
| 507 | int64_t _link; |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 508 | }; |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 509 | |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 510 | /// \brief A MergedSections represents a set of sections grouped by the same |
| 511 | /// name. The output file that gets written by the linker has sections grouped |
| 512 | /// by similiar names |
| 513 | template<support::endianness target_endianness, |
| 514 | std::size_t max_align, |
| 515 | bool is64Bits> |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 516 | class MergedSections { |
| 517 | public: |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 518 | MergedSections(StringRef name) |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 519 | : _name(name) |
| 520 | ,_hasSegment(false) |
| 521 | ,_ordinal(0) |
| 522 | ,_flags(0) |
| 523 | ,_size(0) |
| 524 | ,_memSize(0) |
| 525 | ,_fileOffset(0) |
| 526 | ,_virtualAddr(0) |
| 527 | ,_shInfo(0) |
| 528 | ,_entSize(0) |
| 529 | ,_link(0) |
| 530 | ,_align2(0) |
| 531 | ,_kind(0) |
| 532 | ,_type(0) { } |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 533 | |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 534 | // Set the MergedSections is associated with a segment |
| 535 | void setHasSegment() { _hasSegment = true; } |
| 536 | |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 537 | /// Sets the ordinal |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 538 | void setOrdinal(uint64_t ordinal) { |
| 539 | _ordinal = ordinal; |
| 540 | } |
| 541 | |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 542 | /// Sets the Memory size |
| 543 | void setMemSize(uint64_t memsz) { |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 544 | _memSize = memsz; |
| 545 | } |
| 546 | |
| 547 | /// Sets the size fo the merged Section |
| 548 | void setSize(uint64_t fsiz) { |
| 549 | _size = fsiz; |
| 550 | } |
| 551 | |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 552 | // The offset of the first section contained in the merged section is |
| 553 | // contained here |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 554 | void setFileOffset(uint64_t foffset) { |
| 555 | _fileOffset = foffset; |
| 556 | } |
| 557 | |
| 558 | // Sets the starting address of the section |
| 559 | void setAddr(uint64_t addr) { |
| 560 | _virtualAddr = addr; |
| 561 | } |
| 562 | |
| 563 | // Appends a section into the list of sections that are part of this Merged |
| 564 | // Section |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 565 | void appendSection(Chunk<target_endianness, max_align, is64Bits> *c) { |
| 566 | if (c->align2() > _align2) |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 567 | _align2 = c->align2(); |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 568 | if (c->kind() == |
| 569 | Chunk<target_endianness, max_align, is64Bits>::K_ELFSection) { |
| 570 | Section<target_endianness, max_align, is64Bits> *section; |
| 571 | section = |
| 572 | llvm::dyn_cast<Section<target_endianness, max_align, is64Bits>>(c); |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 573 | _link = section->link(); |
| 574 | _shInfo = section->shinfo(); |
| 575 | _entSize = section->entsize(); |
| 576 | _type = section->type(); |
| 577 | if (_flags < section->flags()) |
| 578 | _flags = section->flags(); |
| 579 | } |
| 580 | _kind = c->kind(); |
| 581 | _sections.push_back(c); |
| 582 | } |
| 583 | |
| 584 | // Iterators |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 585 | typedef typename std::vector< |
| 586 | Chunk<target_endianness, max_align, is64Bits> *>::iterator ChunkIter; |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 587 | |
| 588 | ChunkIter begin_sections() { return _sections.begin(); } |
| 589 | |
| 590 | ChunkIter end_sections() { return _sections.end(); } |
| 591 | |
| 592 | // The below functions returns the properties of the MergeSection |
| 593 | bool hasSegment() const { return _hasSegment; } |
| 594 | |
| 595 | StringRef name() const { return _name; } |
| 596 | |
| 597 | int64_t shinfo() const { return _shInfo; } |
| 598 | |
| 599 | uint64_t align2() const { return _align2; } |
| 600 | |
| 601 | int64_t link() const { return _link; } |
| 602 | |
| 603 | int64_t type() const { return _type; } |
| 604 | |
| 605 | uint64_t virtualAddr() const { return _virtualAddr; } |
| 606 | |
| 607 | int64_t ordinal() const { return _ordinal; } |
| 608 | |
| 609 | int64_t kind() const { return _kind; } |
| 610 | |
| 611 | uint64_t fileSize() const { return _size; } |
| 612 | |
| 613 | int64_t entsize() const { return _entSize; } |
| 614 | |
| 615 | uint64_t fileOffset() const { return _fileOffset; } |
| 616 | |
| 617 | int64_t flags() const { return _flags; } |
| 618 | |
| 619 | uint64_t memSize() { return _memSize; } |
| 620 | |
| 621 | private: |
| 622 | StringRef _name; |
| 623 | bool _hasSegment; |
| 624 | uint64_t _ordinal; |
| 625 | int64_t _flags; |
| 626 | uint64_t _size; |
| 627 | uint64_t _memSize; |
| 628 | uint64_t _fileOffset; |
| 629 | uint64_t _virtualAddr; |
| 630 | int64_t _shInfo; |
| 631 | int64_t _entSize; |
| 632 | int64_t _link; |
| 633 | uint64_t _align2; |
| 634 | int64_t _kind; |
| 635 | int64_t _type; |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 636 | std::vector<Chunk<target_endianness, max_align, is64Bits> *> _sections; |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 637 | }; |
| 638 | |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 639 | /// \brief A segment can be divided into segment slices |
| 640 | /// depending on how the segments can be split |
| 641 | template<support::endianness target_endianness, |
| 642 | std::size_t max_align, |
| 643 | bool is64Bits> |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 644 | class SegmentSlice { |
| 645 | public: |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 646 | typedef typename std::vector< |
Michael J. Spencer | 00b702c | 2013-01-07 07:59:46 +0000 | [diff] [blame] | 647 | Chunk<target_endianness, max_align, is64Bits> *>::iterator sectionIter; |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 648 | |
| 649 | SegmentSlice() { } |
| 650 | |
| 651 | /// Set the segment slice so that it begins at the offset specified |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 652 | /// by fileoffset and set the start of the slice to be s and the end |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 653 | /// of the slice to be e |
| 654 | void set(uint64_t fileoffset, int32_t s, int e) { |
| 655 | _startSection = s; |
| 656 | _endSection = e+1; |
| 657 | _offset = fileoffset; |
| 658 | } |
| 659 | |
| 660 | // Set the segment slice start and end iterators. This is used to walk through |
| 661 | // the sections that are part of the Segment slice |
| 662 | void setSections(sectionIter start, sectionIter end) { |
| 663 | _startSectionIter = start; |
| 664 | _endSectionIter = end; |
| 665 | } |
| 666 | |
| 667 | // Return the fileOffset of the slice |
| 668 | uint64_t fileOffset() const { return _offset; } |
| 669 | |
| 670 | // Return the size of the slice |
| 671 | uint64_t fileSize() const { return _size; } |
| 672 | |
| 673 | // Return the start of the slice |
| 674 | int32_t startSection() const { return _startSection; } |
| 675 | |
| 676 | // Return the start address of the slice |
| 677 | uint64_t virtualAddr() const { return _addr; } |
| 678 | |
| 679 | // Return the memory size of the slice |
| 680 | uint64_t memSize() const { return _memSize; } |
| 681 | |
| 682 | // Return the alignment of the slice |
| 683 | uint64_t align2() const { return _align2; } |
| 684 | |
| 685 | void setSize(uint64_t sz) { _size = sz; } |
| 686 | |
| 687 | void setMemSize(uint64_t memsz) { _memSize = memsz; } |
| 688 | |
| 689 | void setVAddr(uint64_t addr) { _addr = addr; } |
| 690 | |
| 691 | void setAlign(uint64_t align) { _align2 = align; } |
| 692 | |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 693 | static bool compare_slices( |
| 694 | SegmentSlice<target_endianness, max_align, is64Bits> *a, |
| 695 | SegmentSlice<target_endianness, max_align, is64Bits> *b) { |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 696 | return (a->startSection() < b->startSection()); |
| 697 | } |
| 698 | |
| 699 | // Functions to run through the slice |
| 700 | sectionIter sections_begin() { return _startSectionIter; } |
| 701 | |
| 702 | sectionIter sections_end() { return _endSectionIter; } |
| 703 | |
| 704 | private: |
| 705 | int32_t _startSection; |
| 706 | int32_t _endSection; |
| 707 | sectionIter _startSectionIter; |
| 708 | sectionIter _endSectionIter; |
| 709 | uint64_t _addr; |
| 710 | uint64_t _offset; |
| 711 | uint64_t _size; |
| 712 | uint64_t _align2; |
| 713 | uint64_t _memSize; |
| 714 | }; |
| 715 | |
| 716 | /// \brief A segment contains a set of sections, that have similiar properties |
| 717 | // the sections are already seperated based on different flags and properties |
| 718 | // the segment is just a way to concatenate sections to segments |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 719 | template<support::endianness target_endianness, |
| 720 | std::size_t max_align, |
| 721 | bool is64Bits> |
| 722 | class Segment : public Chunk<target_endianness, max_align, is64Bits> { |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 723 | public: |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 724 | typedef typename std::vector<SegmentSlice< |
| 725 | target_endianness, max_align, is64Bits> *>::iterator slice_iter; |
| 726 | typedef typename std::vector< |
Michael J. Spencer | 00b702c | 2013-01-07 07:59:46 +0000 | [diff] [blame] | 727 | Chunk<target_endianness, max_align, is64Bits> *>::iterator SectionIter; |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 728 | |
| 729 | Segment(const StringRef name, |
| 730 | const ELFLayout::SegmentType type, |
| 731 | const WriterOptionsELF &options) |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 732 | : Chunk<target_endianness, max_align, is64Bits>(name, |
| 733 | Chunk<target_endianness, max_align, is64Bits>::K_ELFSegment) |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 734 | , _segmentType(type) |
| 735 | , _flags(0) |
| 736 | , _atomflags(0) |
| 737 | , _options(options) { |
| 738 | this->_align2 = 0; |
| 739 | this->_fsize = 0; |
| 740 | } |
| 741 | |
| 742 | /// append a section to a segment |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 743 | void append(Section<target_endianness, max_align, is64Bits> *section) { |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 744 | _sections.push_back(section); |
| 745 | if (_flags < section->flags()) |
| 746 | _flags = section->flags(); |
| 747 | if (_atomflags < section->atomflags()) |
| 748 | _atomflags = section->atomflags(); |
| 749 | if (this->_align2 < section->align2()) |
| 750 | this->_align2 = section->align2(); |
| 751 | } |
| 752 | |
Michael J. Spencer | 1ac382f0 | 2013-01-07 08:00:04 +0000 | [diff] [blame] | 753 | /// Prepend a generic chunk to the segment. |
| 754 | void prepend(Chunk<target_endianness, max_align, is64Bits> *c) { |
| 755 | _sections.insert(_sections.begin(), c); |
| 756 | } |
| 757 | |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 758 | /// Sort segments depending on the property |
| 759 | /// If we have a Program Header segment, it should appear first |
| 760 | /// If we have a INTERP segment, that should appear after the Program Header |
| 761 | /// All Loadable segments appear next in this order |
| 762 | /// All Read Write Execute segments follow |
| 763 | /// All Read Execute segments appear next |
| 764 | /// All Read only segments appear first |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 765 | /// All Write execute segments follow |
| 766 | static bool compareSegments( |
| 767 | Segment<target_endianness, max_align, is64Bits> *sega, |
| 768 | Segment<target_endianness, max_align, is64Bits> *segb) { |
| 769 | if (sega->atomflags() < segb->atomflags()) |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 770 | return false; |
| 771 | return true; |
| 772 | } |
| 773 | |
| 774 | /// \brief Start assigning file offset to the segment chunks The fileoffset |
| 775 | /// needs to be page at the start of the segment and in addition the |
| 776 | /// fileoffset needs to be aligned to the max section alignment within the |
| 777 | /// segment. This is required so that the ELF property p_poffset % p_align = |
| 778 | /// p_vaddr mod p_align holds true. |
| 779 | /// The algorithm starts off by assigning the startOffset thats passed in as |
| 780 | /// parameter to the first section in the segment, if the difference between |
| 781 | /// the newly computed offset is greater than a page, then we create a segment |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 782 | /// slice, as it would be a waste of virtual memory just to be filled with |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 783 | /// zeroes |
| 784 | void assignOffsets(uint64_t startOffset) { |
| 785 | int startSection = 0; |
| 786 | int currSection = 0; |
| 787 | SectionIter startSectionIter, endSectionIter; |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 788 | // slice align is set to the max alignment of the chunks that are |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 789 | // contained in the slice |
| 790 | uint64_t sliceAlign = 0; |
| 791 | // Current slice size |
| 792 | uint64_t curSliceSize = 0; |
| 793 | // Current Slice File Offset |
| 794 | uint64_t curSliceFileOffset = 0; |
| 795 | |
| 796 | startSectionIter = _sections.begin(); |
| 797 | endSectionIter = _sections.end(); |
| 798 | startSection = 0; |
| 799 | bool isFirstSection = true; |
| 800 | for (auto si = _sections.begin(); si != _sections.end(); ++si) { |
| 801 | if (isFirstSection) { |
| 802 | // align the startOffset to the section alignment |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 803 | uint64_t newOffset = |
| 804 | llvm::RoundUpToAlignment(startOffset, (*si)->align2()); |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 805 | curSliceFileOffset = newOffset; |
| 806 | sliceAlign = (*si)->align2(); |
| 807 | this->setFileOffset(startOffset); |
| 808 | (*si)->setFileOffset(newOffset); |
| 809 | curSliceSize = (*si)->fileSize(); |
| 810 | isFirstSection = false; |
| 811 | } else { |
| 812 | uint64_t curOffset = curSliceFileOffset + curSliceSize; |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 813 | uint64_t newOffset = |
| 814 | llvm::RoundUpToAlignment(curOffset, (*si)->align2()); |
| 815 | SegmentSlice<target_endianness, max_align, is64Bits> *slice = nullptr; |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 816 | // If the newOffset computed is more than a page away, lets create |
| 817 | // a seperate segment, so that memory is not used up while running |
| 818 | if ((newOffset - curOffset) > _options.pageSize()) { |
| 819 | // TODO: use std::find here |
| 820 | for (auto sei = slices_begin(); sei != slices_end(); ++sei) { |
| 821 | if ((*sei)->startSection() == startSection) { |
| 822 | slice = *sei; |
| 823 | break; |
| 824 | } |
| 825 | } |
| 826 | if (!slice) { |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 827 | slice = new (_segmentAllocate.Allocate< |
| 828 | SegmentSlice<target_endianness, max_align, is64Bits>>()) |
| 829 | SegmentSlice<target_endianness, max_align, is64Bits>(); |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 830 | _segmentSlices.push_back(slice); |
| 831 | } |
| 832 | slice->set(curSliceFileOffset, startSection, currSection); |
| 833 | slice->setSections(startSectionIter, endSectionIter); |
| 834 | slice->setSize(curSliceSize); |
| 835 | slice->setAlign(sliceAlign); |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 836 | uint64_t newPageOffset = |
| 837 | llvm::RoundUpToAlignment(curOffset, _options.pageSize()); |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 838 | newOffset = llvm::RoundUpToAlignment(newPageOffset, (*si)->align2()); |
| 839 | curSliceFileOffset = newOffset; |
| 840 | startSectionIter = endSectionIter; |
| 841 | startSection = currSection; |
| 842 | (*si)->setFileOffset(curSliceFileOffset); |
| 843 | curSliceSize = newOffset - curSliceFileOffset + (*si)->fileSize(); |
| 844 | sliceAlign = (*si)->align2(); |
Shankar Easwaran | 2ca8e7d | 2013-01-10 03:16:27 +0000 | [diff] [blame] | 845 | } else { |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 846 | if (sliceAlign < (*si)->align2()) |
| 847 | sliceAlign = (*si)->align2(); |
| 848 | (*si)->setFileOffset(newOffset); |
| 849 | curSliceSize = newOffset - curSliceFileOffset + (*si)->fileSize(); |
| 850 | } |
| 851 | } |
| 852 | currSection++; |
| 853 | endSectionIter = si; |
| 854 | } |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 855 | SegmentSlice<target_endianness, max_align, is64Bits> *slice = nullptr; |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 856 | for (auto sei = slices_begin(); sei != slices_end(); ++sei) { |
| 857 | // TODO: add std::find |
| 858 | if ((*sei)->startSection() == startSection) { |
| 859 | slice = *sei; |
| 860 | break; |
| 861 | } |
| 862 | } |
| 863 | if (!slice) { |
| 864 | slice = new (_segmentAllocate.Allocate |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 865 | <SegmentSlice<target_endianness, max_align, is64Bits>>()) |
| 866 | SegmentSlice<target_endianness, max_align, is64Bits>(); |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 867 | _segmentSlices.push_back(slice); |
| 868 | } |
| 869 | slice->set(curSliceFileOffset, startSection, currSection); |
| 870 | slice->setSections(startSectionIter, _sections.end()); |
| 871 | slice->setSize(curSliceSize); |
| 872 | slice->setAlign(sliceAlign); |
| 873 | this->_fsize = curSliceFileOffset - startOffset + curSliceSize; |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 874 | std::stable_sort(slices_begin(), slices_end(), |
| 875 | SegmentSlice<target_endianness, max_align, is64Bits>::compare_slices); |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 876 | } |
| 877 | |
| 878 | /// \brief Assign virtual addresses to the slices |
Michael J. Spencer | 1ac382f0 | 2013-01-07 08:00:04 +0000 | [diff] [blame] | 879 | void assignVirtualAddress(uint64_t &addr) { |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 880 | for (auto sei = slices_begin(), see = slices_end(); sei != see; ++sei) { |
Michael J. Spencer | 1ac382f0 | 2013-01-07 08:00:04 +0000 | [diff] [blame] | 881 | // Align to a page |
| 882 | addr = llvm::RoundUpToAlignment(addr, _options.pageSize()); |
| 883 | // Align to the slice alignment |
| 884 | addr = llvm::RoundUpToAlignment(addr, (*sei)->align2()); |
| 885 | |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 886 | bool virtualAddressSet = false; |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 887 | for (auto si = (*sei)->sections_begin(), se = (*sei)->sections_end(); |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 888 | si != se; ++si) { |
| 889 | // Align the section address |
| 890 | addr = llvm::RoundUpToAlignment(addr, (*si)->align2()); |
Michael J. Spencer | 1ac382f0 | 2013-01-07 08:00:04 +0000 | [diff] [blame] | 891 | if (!virtualAddressSet) { |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 892 | (*sei)->setVAddr(addr); |
| 893 | virtualAddressSet = true; |
| 894 | } |
| 895 | (*si)->setVAddr(addr); |
Michael J. Spencer | 00b702c | 2013-01-07 07:59:46 +0000 | [diff] [blame] | 896 | if (auto s = |
| 897 | dyn_cast<Section<target_endianness, max_align, is64Bits>>(*si)) |
| 898 | s->assignVirtualAddress(addr); |
Michael J. Spencer | 1ac382f0 | 2013-01-07 08:00:04 +0000 | [diff] [blame] | 899 | else |
| 900 | addr += (*si)->memSize(); |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 901 | (*si)->setMemSize(addr - (*si)->virtualAddr()); |
| 902 | } |
| 903 | (*sei)->setMemSize(addr - (*sei)->virtualAddr()); |
| 904 | } |
| 905 | } |
| 906 | |
| 907 | slice_iter slices_begin() { |
| 908 | return _segmentSlices.begin(); |
| 909 | } |
| 910 | |
| 911 | slice_iter slices_end() { |
| 912 | return _segmentSlices.end(); |
| 913 | } |
| 914 | |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 915 | // Write the Segment |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 916 | void write(ELFWriter *writer, OwningPtr<FileOutputBuffer> &buffer) { |
| 917 | for (auto sei = slices_begin(), see = slices_end(); sei != see; ++sei) { |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 918 | for (auto si = (*sei)->sections_begin(), se = (*sei)->sections_end(); |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 919 | si != se; ++si) { |
| 920 | (*si)->write(writer, buffer); |
| 921 | } |
| 922 | } |
| 923 | } |
| 924 | |
| 925 | // Finalize the segment, before we want to write to the output file |
| 926 | void finalize() { } |
| 927 | |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 928 | // For LLVM RTTI |
| 929 | static inline bool classof( |
| 930 | const Chunk<target_endianness, max_align, is64Bits> *c) { |
| 931 | return c->kind() == |
| 932 | Chunk<target_endianness, max_align, is64Bits>::K_ELFSegment; |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 933 | } |
| 934 | |
| 935 | // Getters |
| 936 | int32_t sectionCount() const { |
| 937 | return _sections.size(); |
| 938 | } |
| 939 | |
| 940 | ELFLayout::SegmentType segmentType() { return _segmentType; } |
| 941 | |
| 942 | int pageSize() const { return _options.pageSize(); } |
| 943 | |
| 944 | int64_t atomflags() const { return _atomflags; } |
| 945 | |
| 946 | int64_t flags() const { |
| 947 | int64_t fl = 0; |
| 948 | if (_flags & llvm::ELF::SHF_ALLOC) |
| 949 | fl |= llvm::ELF::PF_R; |
| 950 | if (_flags & llvm::ELF::SHF_WRITE) |
| 951 | fl |= llvm::ELF::PF_W; |
| 952 | if (_flags & llvm::ELF::SHF_EXECINSTR) |
| 953 | fl |= llvm::ELF::PF_X; |
| 954 | return fl; |
| 955 | } |
| 956 | |
| 957 | int64_t numSlices() const { |
| 958 | return _segmentSlices.size(); |
| 959 | } |
| 960 | |
| 961 | private: |
Michael J. Spencer | 00b702c | 2013-01-07 07:59:46 +0000 | [diff] [blame] | 962 | /// \brief Section or some other chunk type. |
| 963 | std::vector<Chunk<target_endianness, max_align, is64Bits> *> _sections; |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 964 | std::vector<SegmentSlice<target_endianness, max_align, is64Bits> *> |
| 965 | _segmentSlices; |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 966 | ELFLayout::SegmentType _segmentType; |
| 967 | int64_t _flags; |
| 968 | int64_t _atomflags; |
| 969 | const WriterOptionsELF _options; |
| 970 | llvm::BumpPtrAllocator _segmentAllocate; |
| 971 | }; |
| 972 | |
| 973 | /// \brief The class represents the ELF String Table |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 974 | template<support::endianness target_endianness, |
| 975 | std::size_t max_align, |
| 976 | bool is64Bits> |
| 977 | class ELFStringTable : public Section<target_endianness, max_align, is64Bits> { |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 978 | public: |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 979 | ELFStringTable(const char *str, int32_t order) |
| 980 | : Section<target_endianness, max_align, is64Bits>( |
| 981 | str, |
| 982 | llvm::ELF::SHT_STRTAB, |
| 983 | DefinedAtom::perm___, |
| 984 | order, |
| 985 | Section<target_endianness, max_align, is64Bits>::K_StringTable) { |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 986 | // the string table has a NULL entry for which |
| 987 | // add an empty string |
| 988 | _strings.push_back(""); |
| 989 | this->_fsize = 1; |
| 990 | this->_align2 = 1; |
| 991 | this->setOrder(order); |
| 992 | } |
| 993 | |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 994 | static inline bool classof( |
| 995 | const Chunk<target_endianness, max_align, is64Bits> *c) { |
| 996 | return c->kind() == |
| 997 | Section<target_endianness, max_align, is64Bits>::K_StringTable; |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 998 | } |
| 999 | |
| 1000 | uint64_t addString(const StringRef symname) { |
| 1001 | _strings.push_back(symname); |
| 1002 | uint64_t offset = this->_fsize; |
| 1003 | this->_fsize += symname.size() + 1; |
| 1004 | return offset; |
| 1005 | } |
| 1006 | |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1007 | void write(ELFWriter *writer, |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1008 | OwningPtr<FileOutputBuffer> &buffer) { |
| 1009 | uint8_t *chunkBuffer = buffer->getBufferStart(); |
| 1010 | uint8_t *dest = chunkBuffer + this->fileOffset(); |
| 1011 | for (auto si : _strings) { |
| 1012 | memcpy(dest, si.data(), si.size()); |
| 1013 | dest += si.size(); |
| 1014 | memcpy(dest, "", 1); |
| 1015 | dest += 1; |
| 1016 | } |
| 1017 | } |
| 1018 | |
| 1019 | void finalize() { } |
| 1020 | |
| 1021 | private: |
| 1022 | std::vector<StringRef> _strings; |
| 1023 | }; |
| 1024 | |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1025 | /// \brief The ELFSymbolTable class represents the symbol table in a ELF file |
| 1026 | template<support::endianness target_endianness, |
| 1027 | std::size_t max_align, |
| 1028 | bool is64Bits> |
| 1029 | class ELFSymbolTable : public Section<target_endianness, max_align, is64Bits> { |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1030 | public: |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1031 | typedef object::Elf_Sym_Impl<target_endianness, max_align, is64Bits> Elf_Sym; |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1032 | |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1033 | ELFSymbolTable(const char *str, int32_t order) |
| 1034 | : Section<target_endianness, max_align, is64Bits>( |
| 1035 | str, |
| 1036 | llvm::ELF::SHT_SYMTAB, |
| 1037 | 0, |
| 1038 | order, |
| 1039 | Section<target_endianness, max_align, is64Bits>::K_SymbolTable) { |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1040 | this->setOrder(order); |
| 1041 | Elf_Sym *symbol = new (_symbolAllocate.Allocate<Elf_Sym>()) Elf_Sym; |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1042 | memset((void *)symbol, 0, sizeof(Elf_Sym)); |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1043 | _symbolTable.push_back(symbol); |
| 1044 | this->_entSize = sizeof(Elf_Sym); |
| 1045 | this->_fsize = sizeof(Elf_Sym); |
| 1046 | this->_align2 = sizeof(void *); |
| 1047 | } |
| 1048 | |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1049 | static inline bool classof( |
| 1050 | const Chunk<target_endianness, max_align, is64Bits> *c) { |
| 1051 | return c->kind() == |
| 1052 | Section<target_endianness, max_align, is64Bits>::K_SymbolTable; |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1053 | } |
| 1054 | |
| 1055 | void addSymbol(const Atom *atom, int32_t sectionIndex, uint64_t addr = 0) { |
| 1056 | Elf_Sym *symbol = new(_symbolAllocate.Allocate<Elf_Sym>()) Elf_Sym; |
| 1057 | unsigned char binding = 0, type = 0; |
| 1058 | symbol->st_name = _stringSection->addString(atom->name()); |
| 1059 | symbol->st_size = 0; |
| 1060 | symbol->st_shndx = sectionIndex; |
| 1061 | symbol->st_value = 0; |
| 1062 | symbol->st_other = ELF::STV_DEFAULT; |
| 1063 | if (const DefinedAtom *da = llvm::dyn_cast<const DefinedAtom>(atom)){ |
| 1064 | symbol->st_size = da->size(); |
| 1065 | lld::DefinedAtom::ContentType ct; |
| 1066 | switch (ct = da->contentType()){ |
| 1067 | case DefinedAtom::typeCode: |
| 1068 | symbol->st_value = addr; |
| 1069 | type = ELF::STT_FUNC; |
| 1070 | break; |
| 1071 | case DefinedAtom::typeData: |
Michael J. Spencer | 8de8364 | 2013-01-07 08:00:42 +0000 | [diff] [blame] | 1072 | case DefinedAtom::typeConstant: |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1073 | symbol->st_value = addr; |
| 1074 | type = ELF::STT_OBJECT; |
| 1075 | break; |
| 1076 | case DefinedAtom::typeZeroFill: |
Michael J. Spencer | 28c6594 | 2013-01-07 07:05:52 +0000 | [diff] [blame] | 1077 | type = ELF::STT_OBJECT; |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1078 | symbol->st_value = addr; |
| 1079 | break; |
| 1080 | default: |
| 1081 | type = ELF::STT_NOTYPE; |
| 1082 | } |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1083 | if (da->scope() == DefinedAtom::scopeTranslationUnit) |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1084 | binding = ELF::STB_LOCAL; |
| 1085 | else |
| 1086 | binding = ELF::STB_GLOBAL; |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1087 | } else if (const AbsoluteAtom *aa = |
| 1088 | llvm::dyn_cast<const AbsoluteAtom>(atom)){ |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1089 | type = ELF::STT_OBJECT; |
| 1090 | symbol->st_shndx = ELF::SHN_ABS; |
| 1091 | switch (aa->scope()) { |
| 1092 | case AbsoluteAtom::scopeLinkageUnit: |
| 1093 | symbol->st_other = ELF::STV_HIDDEN; |
| 1094 | binding = ELF::STB_LOCAL; |
| 1095 | break; |
| 1096 | case AbsoluteAtom::scopeTranslationUnit: |
| 1097 | binding = ELF::STB_LOCAL; |
| 1098 | break; |
| 1099 | case AbsoluteAtom::scopeGlobal: |
| 1100 | binding = ELF::STB_GLOBAL; |
| 1101 | break; |
| 1102 | } |
Shankar Easwaran | 2ca8e7d | 2013-01-10 03:16:27 +0000 | [diff] [blame] | 1103 | symbol->st_value = addr; |
| 1104 | } else { |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1105 | symbol->st_value = 0; |
| 1106 | type = ELF::STT_NOTYPE; |
| 1107 | binding = ELF::STB_WEAK; |
| 1108 | } |
| 1109 | symbol->setBindingAndType(binding, type); |
| 1110 | _symbolTable.push_back(symbol); |
| 1111 | this->_fsize += sizeof(Elf_Sym); |
| 1112 | } |
| 1113 | |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1114 | void setStringSection( |
| 1115 | ELFStringTable<target_endianness, max_align, is64Bits> *s) { |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1116 | _stringSection = s; |
| 1117 | } |
| 1118 | |
| 1119 | void finalize() { |
| 1120 | // sh_info should be one greater than last symbol with STB_LOCAL binding |
| 1121 | // we sort the symbol table to keep all local symbols at the beginning |
| 1122 | std::stable_sort(_symbolTable.begin(), _symbolTable.end(), |
| 1123 | [](const Elf_Sym *A, const Elf_Sym *B) { |
| 1124 | return A->getBinding() < B->getBinding(); |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1125 | }); |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1126 | uint16_t shInfo = 0; |
| 1127 | for (auto i : _symbolTable) { |
| 1128 | if (i->getBinding() != ELF::STB_LOCAL) |
| 1129 | break; |
| 1130 | shInfo++; |
| 1131 | } |
| 1132 | this->_shInfo = shInfo; |
| 1133 | this->setLink(_stringSection->ordinal()); |
| 1134 | } |
| 1135 | |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1136 | void write(ELFWriter *writer, |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1137 | OwningPtr<FileOutputBuffer> &buffer) { |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1138 | uint8_t *chunkBuffer = buffer->getBufferStart(); |
| 1139 | uint8_t *dest = chunkBuffer + this->fileOffset(); |
| 1140 | for (auto sti : _symbolTable) { |
| 1141 | memcpy(dest, sti, sizeof(Elf_Sym)); |
| 1142 | dest += sizeof(Elf_Sym); |
| 1143 | } |
| 1144 | } |
| 1145 | |
| 1146 | private: |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1147 | ELFStringTable<target_endianness, max_align, is64Bits> *_stringSection; |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1148 | std::vector<Elf_Sym*> _symbolTable; |
| 1149 | llvm::BumpPtrAllocator _symbolAllocate; |
| 1150 | int64_t _link; |
| 1151 | }; |
| 1152 | |
| 1153 | /// \brief An ELFHeader represents the Elf[32/64]_Ehdr structure at the |
Hemant Kulkarni | 927bbc2 | 2012-09-14 16:11:34 +0000 | [diff] [blame] | 1154 | /// start of an ELF executable file. |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1155 | template<support::endianness target_endianness, |
| 1156 | std::size_t max_align, |
| 1157 | bool is64Bits> |
| 1158 | class ELFHeader : public Chunk<target_endianness, max_align, is64Bits> { |
Hemant Kulkarni | 927bbc2 | 2012-09-14 16:11:34 +0000 | [diff] [blame] | 1159 | public: |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1160 | typedef Elf_Ehdr_Impl<target_endianness, max_align, is64Bits> Elf_Ehdr; |
Hemant Kulkarni | 927bbc2 | 2012-09-14 16:11:34 +0000 | [diff] [blame] | 1161 | |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1162 | ELFHeader() |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1163 | : Chunk<target_endianness, max_align, is64Bits>( |
| 1164 | "elfhdr", Chunk<target_endianness, max_align, is64Bits>::K_ELFHeader) { |
Michael J. Spencer | 1ac382f0 | 2013-01-07 08:00:04 +0000 | [diff] [blame] | 1165 | this->_align2 = is64Bits ? 8 : 4; |
| 1166 | this->_fsize = sizeof(Elf_Ehdr); |
| 1167 | this->_msize = sizeof(Elf_Ehdr); |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1168 | memset(_eh.e_ident, 0, llvm::ELF::EI_NIDENT); |
| 1169 | e_ident(ELF::EI_MAG0, 0x7f); |
| 1170 | e_ident(ELF::EI_MAG1, 'E'); |
| 1171 | e_ident(ELF::EI_MAG2, 'L'); |
| 1172 | e_ident(ELF::EI_MAG3, 'F'); |
| 1173 | e_ehsize(sizeof(Elf_Ehdr)); |
| 1174 | e_flags(2); |
| 1175 | } |
Hemant Kulkarni | 927bbc2 | 2012-09-14 16:11:34 +0000 | [diff] [blame] | 1176 | void e_ident(int I, unsigned char C) { _eh.e_ident[I] = C; } |
| 1177 | void e_type(uint16_t type) { _eh.e_type = type; } |
| 1178 | void e_machine(uint16_t machine) { _eh.e_machine = machine; } |
| 1179 | void e_version(uint32_t version) { _eh.e_version = version; } |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1180 | void e_entry(int64_t entry) { _eh.e_entry = entry; } |
| 1181 | void e_phoff(int64_t phoff) { _eh.e_phoff = phoff; } |
| 1182 | void e_shoff(int64_t shoff) { _eh.e_shoff = shoff; } |
Hemant Kulkarni | 927bbc2 | 2012-09-14 16:11:34 +0000 | [diff] [blame] | 1183 | void e_flags(uint32_t flags) { _eh.e_flags = flags; } |
| 1184 | void e_ehsize(uint16_t ehsize) { _eh.e_ehsize = ehsize; } |
| 1185 | void e_phentsize(uint16_t phentsize) { _eh.e_phentsize = phentsize; } |
| 1186 | void e_phnum(uint16_t phnum) { _eh.e_phnum = phnum; } |
| 1187 | void e_shentsize(uint16_t shentsize) { _eh.e_shentsize = shentsize; } |
| 1188 | void e_shnum(uint16_t shnum) { _eh.e_shnum = shnum; } |
| 1189 | void e_shstrndx(uint16_t shstrndx) { _eh.e_shstrndx = shstrndx; } |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1190 | uint64_t fileSize() { return sizeof (Elf_Ehdr); } |
Hemant Kulkarni | 927bbc2 | 2012-09-14 16:11:34 +0000 | [diff] [blame] | 1191 | |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1192 | static inline bool classof( |
| 1193 | const Chunk<target_endianness, max_align, is64Bits> *c) { |
| 1194 | return c->Kind() == |
| 1195 | Chunk<target_endianness, max_align, is64Bits>::K_ELFHeader; |
Hemant Kulkarni | 87dbac0 | 2012-11-13 21:34:45 +0000 | [diff] [blame] | 1196 | } |
Hemant Kulkarni | 927bbc2 | 2012-09-14 16:11:34 +0000 | [diff] [blame] | 1197 | |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1198 | void write(ELFWriter *writer, |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1199 | OwningPtr<FileOutputBuffer> &buffer) { |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1200 | uint8_t *chunkBuffer = buffer->getBufferStart(); |
| 1201 | uint8_t *atomContent = chunkBuffer + this->fileOffset(); |
| 1202 | memcpy(atomContent, &_eh, fileSize()); |
| 1203 | } |
| 1204 | |
| 1205 | void finalize() { } |
Hemant Kulkarni | 927bbc2 | 2012-09-14 16:11:34 +0000 | [diff] [blame] | 1206 | |
| 1207 | private: |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1208 | Elf_Ehdr _eh; |
Hemant Kulkarni | 927bbc2 | 2012-09-14 16:11:34 +0000 | [diff] [blame] | 1209 | }; |
| 1210 | |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1211 | /// \brief An ELFProgramHeader represents the Elf[32/64]_Phdr structure at the |
| 1212 | /// start of an ELF executable file. |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1213 | template<support::endianness target_endianness, |
| 1214 | std::size_t max_align, |
| 1215 | bool is64Bits> |
| 1216 | class ELFProgramHeader : public Chunk<target_endianness, max_align, is64Bits> { |
Hemant Kulkarni | 08e41029 | 2012-10-01 23:53:20 +0000 | [diff] [blame] | 1217 | public: |
Michael J. Spencer | fd3981d | 2013-01-06 05:40:27 +0000 | [diff] [blame] | 1218 | typedef Elf_Phdr_Impl<target_endianness, max_align, is64Bits> Elf_Phdr; |
Shankar Easwaran | 2ca8e7d | 2013-01-10 03:16:27 +0000 | [diff] [blame] | 1219 | typedef typename std::vector<Elf_Phdr *>::iterator PhIterT; |
| 1220 | |
| 1221 | /// \brief Find a program header entry, given the type of entry that |
| 1222 | /// we are looking for |
| 1223 | class FindPhdr { |
| 1224 | public: |
| 1225 | FindPhdr(uint64_t type, uint64_t flags, uint64_t flagsClear) |
| 1226 | : _type(type) |
| 1227 | , _flags(flags) |
| 1228 | , _flagsClear(flagsClear) |
| 1229 | {} |
| 1230 | |
Shankar Easwaran | 37c5282 | 2013-01-10 18:16:10 +0000 | [diff] [blame^] | 1231 | bool operator()(const Elf_Phdr *j) const { |
Shankar Easwaran | 2ca8e7d | 2013-01-10 03:16:27 +0000 | [diff] [blame] | 1232 | return ((j->p_type == _type) && |
| 1233 | ((j->p_flags & _flags) == _flags) && |
| 1234 | (!(j->p_flags & _flagsClear))); |
| 1235 | } |
| 1236 | private: |
| 1237 | uint64_t _type; |
| 1238 | uint64_t _flags; |
| 1239 | uint64_t _flagsClear; |
| 1240 | }; |
Hemant Kulkarni | 927bbc2 | 2012-09-14 16:11:34 +0000 | [diff] [blame] | 1241 | |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1242 | ELFProgramHeader() |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1243 | : Chunk<target_endianness, max_align, is64Bits>( |
| 1244 | "elfphdr", |
Reid Kleckner | e974bd1 | 2013-01-05 02:21:42 +0000 | [diff] [blame] | 1245 | Chunk<target_endianness, max_align, is64Bits>::K_ELFProgramHeader) { |
Michael J. Spencer | 1ac382f0 | 2013-01-07 08:00:04 +0000 | [diff] [blame] | 1246 | this->_align2 = is64Bits ? 8 : 4; |
Reid Kleckner | e974bd1 | 2013-01-05 02:21:42 +0000 | [diff] [blame] | 1247 | resetProgramHeaders(); |
| 1248 | } |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1249 | |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1250 | bool addSegment(Segment<target_endianness, max_align, is64Bits> *segment) { |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1251 | Elf_Phdr *phdr = nullptr; |
| 1252 | bool ret = false; |
| 1253 | |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1254 | for (auto sei = segment->slices_begin(), see = segment->slices_end(); |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1255 | sei != see; ++sei) { |
| 1256 | if (_phi == _ph.end()) { |
| 1257 | phdr = new(_allocator.Allocate<Elf_Phdr>()) Elf_Phdr; |
| 1258 | _ph.push_back(phdr); |
| 1259 | _phi = _ph.end(); |
| 1260 | ret = true; |
| 1261 | } else { |
| 1262 | phdr = (*_phi); |
| 1263 | ++_phi; |
| 1264 | } |
| 1265 | phdr->p_type = segment->segmentType(); |
| 1266 | phdr->p_offset = (*sei)->fileOffset(); |
| 1267 | phdr->p_vaddr = (*sei)->virtualAddr(); |
| 1268 | phdr->p_paddr = (*sei)->virtualAddr(); |
| 1269 | phdr->p_filesz = (*sei)->fileSize(); |
| 1270 | phdr->p_memsz = (*sei)->memSize(); |
| 1271 | phdr->p_flags = segment->flags(); |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1272 | phdr->p_align = (phdr->p_type == llvm::ELF::PT_LOAD) ? |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1273 | segment->pageSize() : (*sei)->align2(); |
| 1274 | } |
Michael J. Spencer | 1ac382f0 | 2013-01-07 08:00:04 +0000 | [diff] [blame] | 1275 | |
| 1276 | this->_fsize = fileSize(); |
| 1277 | this->_msize = this->_fsize; |
| 1278 | |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1279 | return ret; |
| 1280 | } |
| 1281 | |
| 1282 | void resetProgramHeaders() { |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1283 | _phi = _ph.begin(); |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1284 | } |
| 1285 | |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1286 | uint64_t fileSize() { |
Michael J. Spencer | 1ac382f0 | 2013-01-07 08:00:04 +0000 | [diff] [blame] | 1287 | return sizeof(Elf_Phdr) * _ph.size(); |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1288 | } |
| 1289 | |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1290 | static inline bool classof( |
| 1291 | const Chunk<target_endianness, max_align, is64Bits> *c) { |
| 1292 | return c->Kind() == |
| 1293 | Chunk<target_endianness, max_align, is64Bits>::K_ELFProgramHeader; |
| 1294 | } |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1295 | |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1296 | void write(ELFWriter *writer, |
| 1297 | OwningPtr<FileOutputBuffer> &buffer) { |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1298 | uint8_t *chunkBuffer = buffer->getBufferStart(); |
| 1299 | uint8_t *dest = chunkBuffer + this->fileOffset(); |
| 1300 | for (auto phi : _ph) { |
| 1301 | memcpy(dest, phi, sizeof(Elf_Phdr)); |
| 1302 | dest += sizeof(Elf_Phdr); |
| 1303 | } |
| 1304 | } |
| 1305 | |
Shankar Easwaran | 2ca8e7d | 2013-01-10 03:16:27 +0000 | [diff] [blame] | 1306 | /// \brief find a program header entry in the list of program headers |
| 1307 | PhIterT findProgramHeader(uint64_t type, uint64_t flags, uint64_t flagClear) { |
| 1308 | return std::find_if(_ph.begin(), _ph.end(), |
| 1309 | FindPhdr(type, flags, flagClear)); |
| 1310 | } |
| 1311 | |
| 1312 | PhIterT begin() { |
| 1313 | return _ph.begin(); |
| 1314 | } |
| 1315 | |
| 1316 | PhIterT end() { |
| 1317 | return _ph.end(); |
| 1318 | } |
| 1319 | |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1320 | void finalize() { } |
| 1321 | |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1322 | int64_t entsize() { |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1323 | return sizeof(Elf_Phdr); |
| 1324 | } |
| 1325 | |
| 1326 | int64_t numHeaders() { |
| 1327 | return _ph.size(); |
Hemant Kulkarni | 87dbac0 | 2012-11-13 21:34:45 +0000 | [diff] [blame] | 1328 | } |
Hemant Kulkarni | 927bbc2 | 2012-09-14 16:11:34 +0000 | [diff] [blame] | 1329 | |
| 1330 | private: |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1331 | std::vector<Elf_Phdr *> _ph; |
Shankar Easwaran | 2ca8e7d | 2013-01-10 03:16:27 +0000 | [diff] [blame] | 1332 | PhIterT _phi; |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1333 | llvm::BumpPtrAllocator _allocator; |
Hemant Kulkarni | 927bbc2 | 2012-09-14 16:11:34 +0000 | [diff] [blame] | 1334 | }; |
| 1335 | |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1336 | /// \brief An ELFSectionHeader represents the Elf[32/64]_Shdr structure |
| 1337 | /// at the end of the file |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1338 | template<support::endianness target_endianness, |
| 1339 | std::size_t max_align, |
| 1340 | bool is64Bits> |
| 1341 | class ELFSectionHeader : public Chunk<target_endianness, max_align, is64Bits> { |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1342 | public: |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1343 | typedef Elf_Shdr_Impl<target_endianness, max_align, is64Bits> Elf_Shdr; |
Hemant Kulkarni | 87dbac0 | 2012-11-13 21:34:45 +0000 | [diff] [blame] | 1344 | |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1345 | ELFSectionHeader(int32_t order) |
| 1346 | : Chunk<target_endianness, max_align, is64Bits>( |
| 1347 | "shdr", |
| 1348 | Chunk<target_endianness, max_align, is64Bits>::K_ELFSectionHeader) { |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1349 | this->_fsize = 0; |
| 1350 | this->_align2 = 8; |
| 1351 | this->setOrder(order); |
| 1352 | // The first element in the list is always NULL |
| 1353 | Elf_Shdr *nullshdr = new (_sectionAllocate.Allocate<Elf_Shdr>()) Elf_Shdr; |
| 1354 | ::memset(nullshdr, 0, sizeof (Elf_Shdr)); |
| 1355 | _sectionInfo.push_back(nullshdr); |
| 1356 | this->_fsize += sizeof (Elf_Shdr); |
Hemant Kulkarni | 927bbc2 | 2012-09-14 16:11:34 +0000 | [diff] [blame] | 1357 | } |
| 1358 | |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1359 | uint16_t fileSize() { |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1360 | return sizeof(Elf_Shdr) * _sectionInfo.size(); |
Hemant Kulkarni | 08e41029 | 2012-10-01 23:53:20 +0000 | [diff] [blame] | 1361 | } |
Hemant Kulkarni | 927bbc2 | 2012-09-14 16:11:34 +0000 | [diff] [blame] | 1362 | |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1363 | void appendSection( |
| 1364 | MergedSections<target_endianness, max_align, is64Bits> *section) { |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1365 | Elf_Shdr *shdr = new (_sectionAllocate.Allocate<Elf_Shdr>()) Elf_Shdr; |
| 1366 | shdr->sh_name = _stringSection->addString(section->name()); |
| 1367 | shdr->sh_type = section->type(); |
| 1368 | shdr->sh_flags = section->flags(); |
| 1369 | shdr->sh_offset = section->fileOffset(); |
| 1370 | shdr->sh_addr = section->virtualAddr(); |
| 1371 | shdr->sh_size = section->memSize(); |
| 1372 | shdr->sh_link = section->link(); |
| 1373 | shdr->sh_info = section->shinfo(); |
| 1374 | shdr->sh_addralign = section->align2(); |
| 1375 | shdr->sh_entsize = section->entsize(); |
Hemant Kulkarni | 927bbc2 | 2012-09-14 16:11:34 +0000 | [diff] [blame] | 1376 | _sectionInfo.push_back(shdr); |
Hemant Kulkarni | 87dbac0 | 2012-11-13 21:34:45 +0000 | [diff] [blame] | 1377 | } |
Hemant Kulkarni | 927bbc2 | 2012-09-14 16:11:34 +0000 | [diff] [blame] | 1378 | |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1379 | void updateSection(Section<target_endianness, max_align, is64Bits> *section) { |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1380 | Elf_Shdr *shdr = _sectionInfo[section->ordinal()]; |
| 1381 | shdr->sh_type = section->type(); |
| 1382 | shdr->sh_flags = section->flags(); |
| 1383 | shdr->sh_offset = section->fileOffset(); |
| 1384 | shdr->sh_addr = section->virtualAddr(); |
| 1385 | shdr->sh_size = section->fileSize(); |
| 1386 | shdr->sh_link = section->link(); |
| 1387 | shdr->sh_info = section->shinfo(); |
| 1388 | shdr->sh_addralign = section->align2(); |
| 1389 | shdr->sh_entsize = section->entsize(); |
| 1390 | } |
| 1391 | |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1392 | static inline bool classof( |
| 1393 | const Chunk<target_endianness, max_align, is64Bits> *c) { |
| 1394 | return c->getChunkKind() == |
| 1395 | Chunk<target_endianness, max_align, is64Bits>::K_ELFSectionHeader; |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1396 | } |
| 1397 | |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1398 | void setStringSection( |
| 1399 | ELFStringTable<target_endianness, max_align, is64Bits> *s) { |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1400 | _stringSection = s; |
| 1401 | } |
| 1402 | |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1403 | void write(ELFWriter *writer, |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1404 | OwningPtr<FileOutputBuffer> &buffer) { |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1405 | uint8_t *chunkBuffer = buffer->getBufferStart(); |
| 1406 | uint8_t *dest = chunkBuffer + this->fileOffset(); |
| 1407 | for (auto shi : _sectionInfo) { |
| 1408 | memcpy(dest, shi, sizeof(Elf_Shdr)); |
| 1409 | dest += sizeof(Elf_Shdr); |
| 1410 | } |
| 1411 | _stringSection->write(writer, buffer); |
| 1412 | } |
| 1413 | |
| 1414 | void finalize() { } |
| 1415 | |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1416 | int64_t entsize() { |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1417 | return sizeof(Elf_Shdr); |
| 1418 | } |
| 1419 | |
| 1420 | int64_t numHeaders() { |
| 1421 | return _sectionInfo.size(); |
| 1422 | } |
| 1423 | |
| 1424 | private: |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1425 | ELFStringTable<target_endianness, max_align, is64Bits> *_stringSection; |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1426 | std::vector<Elf_Shdr*> _sectionInfo; |
| 1427 | llvm::BumpPtrAllocator _sectionAllocate; |
| 1428 | }; |
| 1429 | |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1430 | /// \brief The DefaultELFLayout class is used by the Writer to arrange |
| 1431 | /// sections and segments in the order determined by the target ELF |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1432 | /// format. The writer creates a single instance of the DefaultELFLayout |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1433 | /// class |
| 1434 | template<support::endianness target_endianness, |
| 1435 | std::size_t max_align, |
| 1436 | bool is64Bits> |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1437 | class DefaultELFLayout : public ELFLayout { |
| 1438 | public: |
Hemant Kulkarni | 87dbac0 | 2012-11-13 21:34:45 +0000 | [diff] [blame] | 1439 | |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1440 | // The order in which the sections appear in the output file |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1441 | // If its determined, that the layout needs to change |
| 1442 | // just changing the order of enumerations would essentially |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1443 | // change the layout in the output file |
| 1444 | enum DefaultSectionOrder { |
| 1445 | ORDER_NOT_DEFINED = 0, |
| 1446 | ORDER_INTERP, |
| 1447 | ORDER_NOTE, |
| 1448 | ORDER_HASH, |
| 1449 | ORDER_DYNAMIC_SYMBOLS, |
| 1450 | ORDER_DYNAMIC_STRINGS, |
| 1451 | ORDER_INIT, |
| 1452 | ORDER_TEXT, |
| 1453 | ORDER_PLT, |
| 1454 | ORDER_FINI, |
| 1455 | ORDER_RODATA, |
| 1456 | ORDER_EH_FRAME, |
| 1457 | ORDER_EH_FRAMEHDR, |
| 1458 | ORDER_CTORS, |
| 1459 | ORDER_DTORS, |
| 1460 | ORDER_DYNAMIC, |
| 1461 | ORDER_GOT, |
| 1462 | ORDER_GOT_PLT, |
| 1463 | ORDER_DATA, |
| 1464 | ORDER_BSS, |
| 1465 | ORDER_OTHER, |
| 1466 | ORDER_SECTION_STRINGS, |
| 1467 | ORDER_SYMBOL_TABLE, |
| 1468 | ORDER_STRING_TABLE, |
| 1469 | ORDER_SECTION_HEADERS |
| 1470 | }; |
Hemant Kulkarni | 87dbac0 | 2012-11-13 21:34:45 +0000 | [diff] [blame] | 1471 | |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1472 | public: |
| 1473 | |
| 1474 | // The Key used for creating Sections |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1475 | // The sections are created using |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1476 | // SectionName, [contentType, contentPermissions] |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1477 | typedef std::pair<StringRef, |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1478 | std::pair<int32_t, int32_t>> Key; |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1479 | typedef typename std::vector< |
| 1480 | Chunk<target_endianness, max_align, is64Bits> *>::iterator ChunkIter; |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1481 | // The key used for Segments |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1482 | // The segments are created using |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1483 | // SegmentName, Segment flags |
| 1484 | typedef std::pair<StringRef, int64_t> SegmentKey; |
| 1485 | // Merged Sections contain the map of Sectionnames to a vector of sections, |
| 1486 | // that have been merged to form a single section |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1487 | typedef std::map<StringRef, MergedSections< |
| 1488 | target_endianness, max_align, is64Bits> *> MergedSectionMapT; |
| 1489 | typedef typename std::vector<MergedSections< |
| 1490 | target_endianness, max_align, is64Bits> *>::iterator MergedSectionIter; |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1491 | |
| 1492 | // HashKey for the Section |
| 1493 | class HashKey { |
| 1494 | public: |
| 1495 | int64_t operator() (const Key &k) const { |
| 1496 | // k.first = section Name |
| 1497 | // k.second = [contentType, Permissions] |
| 1498 | return llvm::hash_combine(k.first, k.second.first, k.second.second); |
| 1499 | } |
| 1500 | }; |
| 1501 | |
| 1502 | // HashKey for the Segment |
| 1503 | class SegmentHashKey { |
| 1504 | public: |
| 1505 | int64_t operator() (const SegmentKey &k) const { |
| 1506 | // k.first = SegmentName |
| 1507 | // k.second = SegmentFlags |
| 1508 | return llvm::hash_combine(k.first, k.second); |
| 1509 | } |
| 1510 | }; |
| 1511 | |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1512 | typedef std::unordered_map<Key, Section< |
| 1513 | target_endianness, max_align, is64Bits>*, HashKey> SectionMapT; |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1514 | typedef std::unordered_map<SegmentKey, |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1515 | Segment<target_endianness, max_align, is64Bits>*, |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1516 | SegmentHashKey> SegmentMapT; |
| 1517 | |
Shankar Easwaran | 2ca8e7d | 2013-01-10 03:16:27 +0000 | [diff] [blame] | 1518 | /// \brief All absolute atoms are created in the ELF Layout by using |
| 1519 | /// an AbsoluteAtomPair. Contains a pair of AbsoluteAtom and the |
| 1520 | /// value which is the address of the absolute atom |
| 1521 | class AbsoluteAtomPair { |
| 1522 | public: |
| 1523 | AbsoluteAtomPair(const AbsoluteAtom *a, int64_t value) |
| 1524 | : _absoluteAtom(a) |
| 1525 | , _value(value) { } |
| 1526 | |
| 1527 | const AbsoluteAtom *absoluteAtom() { return _absoluteAtom; } |
| 1528 | int64_t value() const { return _value; } |
| 1529 | void setValue(int64_t val) { _value = val; } |
| 1530 | |
| 1531 | private: |
| 1532 | const AbsoluteAtom *_absoluteAtom; |
| 1533 | int64_t _value; |
| 1534 | }; |
| 1535 | |
| 1536 | /// \brief find a absolute atom pair given a absolute atom name |
| 1537 | struct FindByName { |
| 1538 | const std::string name; |
| 1539 | FindByName(const StringRef name) : name(name) {} |
| 1540 | bool operator()(AbsoluteAtomPair& j) { |
| 1541 | return j.absoluteAtom()->name() == name; |
| 1542 | } |
| 1543 | }; |
| 1544 | |
| 1545 | typedef typename std::vector<AbsoluteAtomPair>::iterator AbsoluteAtomIterT; |
| 1546 | |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1547 | DefaultELFLayout(const WriterOptionsELF &options):_options(options) { } |
| 1548 | |
| 1549 | /// \brief Return the section order for a input section |
| 1550 | virtual SectionOrder getSectionOrder |
| 1551 | (const StringRef name, |
| 1552 | int32_t contentType, |
| 1553 | int32_t contentPermissions) { |
| 1554 | switch (contentType) { |
| 1555 | case DefinedAtom::typeCode: |
| 1556 | return llvm::StringSwitch<Reference::Kind>(name) |
| 1557 | .StartsWith(".eh_frame_hdr", ORDER_EH_FRAMEHDR) |
| 1558 | .StartsWith(".eh_frame", ORDER_EH_FRAME) |
| 1559 | .StartsWith(".init", ORDER_INIT) |
| 1560 | .StartsWith(".fini", ORDER_FINI) |
| 1561 | .StartsWith(".hash", ORDER_HASH) |
| 1562 | .Default(ORDER_TEXT); |
| 1563 | |
| 1564 | case DefinedAtom::typeConstant: |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1565 | return ORDER_RODATA; |
| 1566 | |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1567 | case DefinedAtom::typeData: |
| 1568 | return ORDER_DATA; |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1569 | |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1570 | case DefinedAtom::typeZeroFill: |
| 1571 | return ORDER_BSS; |
| 1572 | |
| 1573 | default: |
| 1574 | // If we get passed in a section push it to OTHER |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1575 | if (contentPermissions == DefinedAtom::perm___) |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1576 | return ORDER_OTHER; |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1577 | |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1578 | return ORDER_NOT_DEFINED; |
| 1579 | } |
| 1580 | } |
| 1581 | |
| 1582 | /// \brief This maps the input sections to the output section names |
| 1583 | StringRef getSectionName(const StringRef name, |
| 1584 | const int32_t contentType) { |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1585 | if (contentType == DefinedAtom::typeZeroFill) |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1586 | return ".bss"; |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1587 | if (name.startswith(".text")) |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1588 | return ".text"; |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1589 | if (name.startswith(".rodata")) |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1590 | return ".rodata"; |
| 1591 | return name; |
| 1592 | } |
| 1593 | |
| 1594 | /// \brief Gets the segment for a output section |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1595 | virtual ELFLayout::SegmentType getSegmentType( |
| 1596 | Section<target_endianness, max_align, is64Bits> *section) const { |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1597 | switch(section->order()) { |
| 1598 | case ORDER_INTERP: |
| 1599 | return llvm::ELF::PT_INTERP; |
| 1600 | |
| 1601 | case ORDER_TEXT: |
| 1602 | case ORDER_HASH: |
| 1603 | case ORDER_DYNAMIC_SYMBOLS: |
| 1604 | case ORDER_DYNAMIC_STRINGS: |
| 1605 | case ORDER_INIT: |
| 1606 | case ORDER_PLT: |
| 1607 | case ORDER_FINI: |
| 1608 | case ORDER_RODATA: |
| 1609 | case ORDER_EH_FRAME: |
| 1610 | case ORDER_EH_FRAMEHDR: |
| 1611 | return llvm::ELF::PT_LOAD; |
| 1612 | |
| 1613 | case ORDER_NOTE: |
| 1614 | return llvm::ELF::PT_NOTE; |
| 1615 | |
| 1616 | case ORDER_DYNAMIC: |
| 1617 | return llvm::ELF::PT_DYNAMIC; |
| 1618 | |
| 1619 | case ORDER_CTORS: |
| 1620 | case ORDER_DTORS: |
| 1621 | case ORDER_GOT: |
| 1622 | return llvm::ELF::PT_GNU_RELRO; |
| 1623 | |
| 1624 | case ORDER_GOT_PLT: |
| 1625 | case ORDER_DATA: |
| 1626 | case ORDER_BSS: |
| 1627 | return llvm::ELF::PT_LOAD; |
| 1628 | |
| 1629 | default: |
| 1630 | return llvm::ELF::PT_NULL; |
| 1631 | } |
| 1632 | } |
| 1633 | |
| 1634 | /// \brief Returns true/false depending on whether the section has a Output |
| 1635 | // segment or not |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1636 | static bool hasOutputSegment(Section<target_endianness, max_align, |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1637 | is64Bits> *section) { |
| 1638 | switch(section->order()) { |
| 1639 | case ORDER_INTERP: |
| 1640 | case ORDER_HASH: |
| 1641 | case ORDER_DYNAMIC_SYMBOLS: |
| 1642 | case ORDER_DYNAMIC_STRINGS: |
| 1643 | case ORDER_INIT: |
| 1644 | case ORDER_PLT: |
| 1645 | case ORDER_TEXT: |
| 1646 | case ORDER_FINI: |
| 1647 | case ORDER_RODATA: |
| 1648 | case ORDER_EH_FRAME: |
| 1649 | case ORDER_EH_FRAMEHDR: |
| 1650 | case ORDER_NOTE: |
| 1651 | case ORDER_DYNAMIC: |
| 1652 | case ORDER_CTORS: |
| 1653 | case ORDER_DTORS: |
| 1654 | case ORDER_GOT: |
| 1655 | case ORDER_GOT_PLT: |
| 1656 | case ORDER_DATA: |
| 1657 | case ORDER_BSS: |
| 1658 | return true; |
| 1659 | |
| 1660 | default: |
| 1661 | return false; |
| 1662 | } |
| 1663 | } |
| 1664 | |
| 1665 | // Adds an atom to the section |
| 1666 | virtual error_code addAtom(const Atom *atom) { |
Shankar Easwaran | 2ca8e7d | 2013-01-10 03:16:27 +0000 | [diff] [blame] | 1667 | if (const DefinedAtom *definedAtom = dyn_cast<DefinedAtom>(atom)) { |
| 1668 | const StringRef sectionName = |
| 1669 | getSectionName(definedAtom->customSectionName(), |
| 1670 | definedAtom->contentType()); |
| 1671 | const lld::DefinedAtom::ContentPermissions permissions = |
| 1672 | definedAtom->permissions(); |
| 1673 | const lld::DefinedAtom::ContentType contentType = |
| 1674 | definedAtom->contentType(); |
| 1675 | const Key key(sectionName, std::make_pair(contentType, permissions)); |
| 1676 | const std::pair<Key, Section<target_endianness, max_align, is64Bits> *> |
| 1677 | currentSection(key, nullptr); |
| 1678 | std::pair<typename SectionMapT::iterator, bool> |
| 1679 | sectionInsert(_sectionMap.insert(currentSection)); |
| 1680 | Section<target_endianness, max_align, is64Bits> *section; |
| 1681 | // the section is already in the map |
| 1682 | if (!sectionInsert.second) { |
| 1683 | section = sectionInsert.first->second; |
| 1684 | section->setContentPermissions(permissions); |
| 1685 | } else { |
| 1686 | SectionOrder section_order = getSectionOrder(sectionName, |
| 1687 | contentType, |
| 1688 | permissions); |
| 1689 | section = new (_allocator.Allocate |
| 1690 | <Section<target_endianness, max_align, is64Bits>>()) |
| 1691 | Section<target_endianness, max_align, is64Bits> |
| 1692 | (sectionName, contentType, |
| 1693 | permissions, section_order); |
| 1694 | sectionInsert.first->second = section; |
| 1695 | section->setOrder(section_order); |
| 1696 | _sections.push_back(section); |
| 1697 | } |
| 1698 | section->appendAtom(atom); |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1699 | } |
Shankar Easwaran | 2ca8e7d | 2013-01-10 03:16:27 +0000 | [diff] [blame] | 1700 | // Absolute atoms are not part of any section, they are global for the whole |
| 1701 | // link |
| 1702 | else if (const AbsoluteAtom *absoluteAtom = dyn_cast<AbsoluteAtom>(atom)) { |
| 1703 | _absoluteAtoms.push_back(AbsoluteAtomPair(absoluteAtom, |
| 1704 | absoluteAtom->value())); |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1705 | } |
Shankar Easwaran | 2ca8e7d | 2013-01-10 03:16:27 +0000 | [diff] [blame] | 1706 | else |
| 1707 | llvm_unreachable("Only absolute / defined atoms can be added here"); |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1708 | return error_code::success(); |
| 1709 | } |
| 1710 | |
Shankar Easwaran | 2ca8e7d | 2013-01-10 03:16:27 +0000 | [diff] [blame] | 1711 | /// \brief find a absolute atom given a name |
| 1712 | AbsoluteAtomIterT findAbsoluteAtom(const StringRef name) { |
| 1713 | return std::find_if(_absoluteAtoms.begin(), _absoluteAtoms.end(), |
| 1714 | FindByName(name)); |
| 1715 | } |
| 1716 | |
| 1717 | /// \bried Begin/End iterators |
| 1718 | AbsoluteAtomIterT absAtomsBegin() { |
| 1719 | return _absoluteAtoms.begin(); |
| 1720 | } |
| 1721 | |
| 1722 | AbsoluteAtomIterT absAtomsEnd() { |
| 1723 | return _absoluteAtoms.end(); |
| 1724 | } |
| 1725 | |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1726 | // Merge sections with the same name into a MergedSections |
| 1727 | void mergeSimiliarSections() { |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1728 | MergedSections<target_endianness, max_align, is64Bits> *mergedSection; |
| 1729 | |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1730 | for (auto &si : _sections) { |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1731 | const std::pair<StringRef, |
| 1732 | MergedSections<target_endianness, max_align, is64Bits> *> |
| 1733 | currentMergedSections(si->name(), nullptr); |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1734 | std::pair<typename MergedSectionMapT::iterator, bool> |
| 1735 | mergedSectionInsert |
| 1736 | (_mergedSectionMap.insert(currentMergedSections)); |
| 1737 | if (!mergedSectionInsert.second) { |
| 1738 | mergedSection = mergedSectionInsert.first->second; |
Shankar Easwaran | 2ca8e7d | 2013-01-10 03:16:27 +0000 | [diff] [blame] | 1739 | } else { |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1740 | mergedSection = new (_allocator.Allocate< |
| 1741 | MergedSections<target_endianness, max_align, is64Bits>>()) |
| 1742 | MergedSections<target_endianness, max_align, is64Bits>(si->name()); |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1743 | _mergedSections.push_back(mergedSection); |
| 1744 | mergedSectionInsert.first->second = mergedSection; |
| 1745 | } |
| 1746 | mergedSection->appendSection(si); |
| 1747 | } |
| 1748 | } |
| 1749 | |
| 1750 | void assignSectionsToSegments() { |
| 1751 | // sort the sections by their order as defined by the layout |
| 1752 | std::stable_sort(_sections.begin(), _sections.end(), |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1753 | [](Chunk<target_endianness, max_align, is64Bits> *A, |
| 1754 | Chunk<target_endianness, max_align, is64Bits> *B) { |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1755 | return A->order() < B->order(); |
| 1756 | }); |
| 1757 | // Merge all sections |
| 1758 | mergeSimiliarSections(); |
| 1759 | // Set the ordinal after sorting the sections |
| 1760 | int ordinal = 1; |
| 1761 | for (auto &msi : _mergedSections) { |
| 1762 | (*msi).setOrdinal(ordinal); |
| 1763 | for (auto ai = (*msi).begin_sections(), ae = (*msi).end_sections(); |
| 1764 | ai != ae; ++ai) { |
| 1765 | (*ai)->setOrdinal(ordinal); |
| 1766 | } |
| 1767 | ++ordinal; |
| 1768 | } |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1769 | Section<target_endianness, max_align, is64Bits> *section; |
| 1770 | Segment<target_endianness, max_align, is64Bits> *segment; |
| 1771 | for (auto msi = merged_sections_begin(), mse = merged_sections_end(); |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1772 | msi != mse; ++msi) { |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1773 | for (auto ai = (*msi)->begin_sections(), ae = (*msi)->end_sections(); |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1774 | ai != ae; ++ai) { |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1775 | if ((*ai)->kind() == |
| 1776 | Chunk<target_endianness, max_align, is64Bits>::K_ELFSection) { |
| 1777 | section = llvm::dyn_cast< |
| 1778 | Section<target_endianness, max_align, is64Bits>>(*ai); |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1779 | if (!hasOutputSegment(section)) |
| 1780 | continue; |
| 1781 | (*msi)->setHasSegment(); |
| 1782 | section->setSegment(getSegmentType(section)); |
| 1783 | const StringRef segmentName = section->segmentKindToStr(); |
| 1784 | // Use the flags of the merged Section for the segment |
| 1785 | const SegmentKey key(segmentName, (*msi)->flags()); |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1786 | const std::pair<SegmentKey, |
| 1787 | Segment<target_endianness, max_align, is64Bits> *> |
| 1788 | currentSegment(key, nullptr); |
| 1789 | std::pair<typename SegmentMapT::iterator, bool> |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1790 | segmentInsert(_segmentMap.insert(currentSegment)); |
| 1791 | |
| 1792 | if (!segmentInsert.second) { |
| 1793 | segment = segmentInsert.first->second; |
| 1794 | } else { |
| 1795 | segment = new (_allocator.Allocate |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1796 | <Segment<target_endianness, max_align, is64Bits>>()) |
| 1797 | Segment<target_endianness, max_align, is64Bits> |
| 1798 | (segmentName, getSegmentType(section), |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1799 | _options); |
| 1800 | segmentInsert.first->second = segment; |
| 1801 | _segments.push_back(segment); |
| 1802 | } |
| 1803 | segment->append(section); |
Hemant Kulkarni | 87dbac0 | 2012-11-13 21:34:45 +0000 | [diff] [blame] | 1804 | } |
| 1805 | } |
Hemant Kulkarni | 87dbac0 | 2012-11-13 21:34:45 +0000 | [diff] [blame] | 1806 | } |
| 1807 | } |
Hemant Kulkarni | 87dbac0 | 2012-11-13 21:34:45 +0000 | [diff] [blame] | 1808 | |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1809 | void addSection(Chunk<target_endianness, max_align, is64Bits> *c) { |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1810 | _sections.push_back(c); |
| 1811 | } |
Hemant Kulkarni | 87dbac0 | 2012-11-13 21:34:45 +0000 | [diff] [blame] | 1812 | |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1813 | void assignFileOffsets() { |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1814 | std::sort(_segments.begin(), |
| 1815 | _segments.end(), |
| 1816 | Segment<target_endianness, max_align, is64Bits>::compareSegments); |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1817 | int ordinal = 0; |
| 1818 | // Compute the number of segments that might be needed, so that the |
| 1819 | // size of the program header can be computed |
| 1820 | uint64_t offset = 0; |
| 1821 | for (auto si : _segments) { |
| 1822 | si->setOrdinal(++ordinal); |
| 1823 | si->assignOffsets(offset); |
| 1824 | offset += si->fileSize(); |
| 1825 | } |
Hemant Kulkarni | 87dbac0 | 2012-11-13 21:34:45 +0000 | [diff] [blame] | 1826 | } |
Hemant Kulkarni | 87dbac0 | 2012-11-13 21:34:45 +0000 | [diff] [blame] | 1827 | |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1828 | void setELFHeader(ELFHeader<target_endianness, max_align, is64Bits> *e) { |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1829 | _elfHeader = e; |
| 1830 | } |
Hemant Kulkarni | 87dbac0 | 2012-11-13 21:34:45 +0000 | [diff] [blame] | 1831 | |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1832 | void setProgramHeader( |
| 1833 | ELFProgramHeader<target_endianness, max_align, is64Bits> *p) { |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1834 | _programHeader = p; |
Hemant Kulkarni | 927bbc2 | 2012-09-14 16:11:34 +0000 | [diff] [blame] | 1835 | } |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1836 | |
| 1837 | void assignVirtualAddress() { |
Michael J. Spencer | 1ac382f0 | 2013-01-07 08:00:04 +0000 | [diff] [blame] | 1838 | if (_segments.empty()) |
| 1839 | return; |
| 1840 | |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1841 | uint64_t virtualAddress = _options.baseAddress(); |
| 1842 | |
Michael J. Spencer | 1ac382f0 | 2013-01-07 08:00:04 +0000 | [diff] [blame] | 1843 | // HACK: This is a super dirty hack. The elf header and program header are |
| 1844 | // not part of a section, but we need them to be loaded at the base address |
| 1845 | // so that AT_PHDR is set correctly by the loader and so they are accessible |
| 1846 | // at runtime. To do this we simply prepend them to the first Segment and |
| 1847 | // let the layout logic take care of it. |
| 1848 | _segments[0]->prepend(_programHeader); |
| 1849 | _segments[0]->prepend(_elfHeader); |
| 1850 | |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1851 | bool newSegmentHeaderAdded = true; |
Michael J. Spencer | 1ac382f0 | 2013-01-07 08:00:04 +0000 | [diff] [blame] | 1852 | while (true) { |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1853 | for (auto si : _segments) { |
| 1854 | newSegmentHeaderAdded = _programHeader->addSegment(si); |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1855 | } |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1856 | if (!newSegmentHeaderAdded) |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1857 | break; |
Michael J. Spencer | 1ac382f0 | 2013-01-07 08:00:04 +0000 | [diff] [blame] | 1858 | uint64_t fileoffset = 0; |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1859 | uint64_t address = virtualAddress; |
| 1860 | // Fix the offsets after adding the program header |
| 1861 | for (auto &si : _segments) { |
| 1862 | // Align the segment to a page boundary |
| 1863 | fileoffset = llvm::RoundUpToAlignment(fileoffset, _options.pageSize()); |
| 1864 | si->assignOffsets(fileoffset); |
| 1865 | fileoffset = si->fileOffset() + si->fileSize(); |
| 1866 | } |
| 1867 | // start assigning virtual addresses |
| 1868 | for (auto si = _segments.begin(); si != _segments.end(); ++si) { |
| 1869 | (*si)->setVAddr(virtualAddress); |
| 1870 | // The first segment has the virtualAddress set to the base address as |
| 1871 | // we have added the file header and the program header dont align the |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1872 | // first segment to the pagesize |
Michael J. Spencer | 1ac382f0 | 2013-01-07 08:00:04 +0000 | [diff] [blame] | 1873 | (*si)->assignVirtualAddress(address); |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1874 | (*si)->setMemSize(address - virtualAddress); |
| 1875 | virtualAddress = llvm::RoundUpToAlignment(address, _options.pageSize()); |
| 1876 | } |
| 1877 | _programHeader->resetProgramHeaders(); |
| 1878 | } |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1879 | Section<target_endianness, max_align, is64Bits> *section; |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1880 | // Fix the offsets of all the atoms within a section |
| 1881 | for (auto &si : _sections) { |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1882 | section = |
| 1883 | llvm::dyn_cast<Section<target_endianness, max_align, is64Bits>>(si); |
| 1884 | if (section && |
| 1885 | DefaultELFLayout<target_endianness, |
| 1886 | max_align, is64Bits>::hasOutputSegment(section)) |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1887 | section->assignOffsets(section->fileOffset()); |
| 1888 | } |
| 1889 | // Set the size of the merged Sections |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1890 | for (auto msi = merged_sections_begin(), mse = merged_sections_end(); |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1891 | msi != mse; ++msi) { |
| 1892 | uint64_t sectionfileoffset = 0; |
| 1893 | uint64_t startFileOffset = 0; |
| 1894 | uint64_t sectionsize = 0; |
| 1895 | bool isFirstSection = true; |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1896 | for (auto si = (*msi)->begin_sections(); si != (*msi)->end_sections(); |
| 1897 | ++si) { |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1898 | if (isFirstSection) { |
| 1899 | startFileOffset = (*si)->fileOffset(); |
| 1900 | isFirstSection = false; |
| 1901 | } |
| 1902 | sectionfileoffset = (*si)->fileOffset(); |
| 1903 | sectionsize = (*si)->fileSize(); |
| 1904 | } |
| 1905 | sectionsize = (sectionfileoffset - startFileOffset) + sectionsize; |
| 1906 | (*msi)->setFileOffset(startFileOffset); |
| 1907 | (*msi)->setSize(sectionsize); |
| 1908 | } |
| 1909 | // Set the virtual addr of the merged Sections |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1910 | for (auto msi = merged_sections_begin(), mse = merged_sections_end(); |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1911 | msi != mse; ++msi) { |
| 1912 | uint64_t sectionstartaddr = 0; |
| 1913 | uint64_t startaddr = 0; |
| 1914 | uint64_t sectionsize = 0; |
| 1915 | bool isFirstSection = true; |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1916 | for (auto si = (*msi)->begin_sections(), se = (*msi)->end_sections(); |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1917 | si != se; ++si) { |
| 1918 | if (isFirstSection) { |
| 1919 | startaddr = (*si)->virtualAddr(); |
| 1920 | isFirstSection = false; |
| 1921 | } |
| 1922 | sectionstartaddr = (*si)->virtualAddr(); |
| 1923 | sectionsize = (*si)->memSize(); |
| 1924 | } |
| 1925 | sectionsize = (sectionstartaddr - startaddr) + sectionsize; |
| 1926 | (*msi)->setMemSize(sectionsize); |
| 1927 | (*msi)->setAddr(startaddr); |
| 1928 | } |
Hemant Kulkarni | 927bbc2 | 2012-09-14 16:11:34 +0000 | [diff] [blame] | 1929 | } |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1930 | |
| 1931 | void assignOffsetsForMiscSections() { |
| 1932 | uint64_t fileoffset = 0; |
| 1933 | uint64_t size = 0; |
| 1934 | for (auto si : _segments) { |
| 1935 | fileoffset = si->fileOffset(); |
| 1936 | size = si->fileSize(); |
| 1937 | } |
| 1938 | fileoffset = fileoffset + size; |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1939 | Section<target_endianness, max_align, is64Bits> *section; |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1940 | for (auto si : _sections) { |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1941 | section = |
| 1942 | llvm::dyn_cast<Section<target_endianness, max_align, is64Bits>>(si); |
| 1943 | if (section && |
| 1944 | DefaultELFLayout<target_endianness, |
| 1945 | max_align, is64Bits>::hasOutputSegment(section)) |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1946 | continue; |
| 1947 | fileoffset = llvm::RoundUpToAlignment(fileoffset, si->align2()); |
| 1948 | si->setFileOffset(fileoffset); |
| 1949 | si->setVAddr(0); |
| 1950 | fileoffset += si->fileSize(); |
| 1951 | } |
Hemant Kulkarni | 08e41029 | 2012-10-01 23:53:20 +0000 | [diff] [blame] | 1952 | } |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1953 | |
| 1954 | void finalize() { |
| 1955 | for (auto &si : _sections) { |
| 1956 | si->finalize(); |
| 1957 | } |
| 1958 | } |
| 1959 | |
| 1960 | bool findAtomAddrByName(const StringRef name, uint64_t &addr) { |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1961 | Section<target_endianness, max_align, is64Bits> *section; |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1962 | for (auto ai = _sections.begin(); ai != _sections.end(); ++ai) { |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1963 | if ((*ai)->kind() == |
| 1964 | Chunk<target_endianness, max_align, is64Bits>::K_ELFSection) { |
| 1965 | section = |
| 1966 | llvm::dyn_cast<Section<target_endianness, max_align, is64Bits>>(*ai); |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1967 | if (section->findAtomAddrByName(name, addr)) |
| 1968 | return true; |
| 1969 | } |
| 1970 | } |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1971 | return false; |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1972 | } |
| 1973 | |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1974 | MergedSectionIter merged_sections_begin() { |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1975 | return _mergedSections.begin(); |
| 1976 | } |
| 1977 | |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1978 | MergedSectionIter merged_sections_end() { |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1979 | return _mergedSections.end(); |
| 1980 | } |
| 1981 | |
| 1982 | ChunkIter sections_begin() { |
| 1983 | return _sections.begin(); |
| 1984 | } |
| 1985 | ChunkIter sections_end() { |
| 1986 | return _sections.end(); |
| 1987 | } |
| 1988 | |
| 1989 | ChunkIter segments_begin() { |
| 1990 | return _segments.begin(); |
| 1991 | } |
| 1992 | |
| 1993 | ChunkIter segments_end() { |
| 1994 | return _segments.end(); |
| 1995 | } |
| 1996 | |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 1997 | ELFHeader<target_endianness, max_align, is64Bits> *elfHeader() { |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 1998 | return _elfHeader; |
| 1999 | } |
| 2000 | |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 2001 | ELFProgramHeader<target_endianness, max_align, is64Bits> *elfProgramHeader() { |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 2002 | return _programHeader; |
Hemant Kulkarni | 08e41029 | 2012-10-01 23:53:20 +0000 | [diff] [blame] | 2003 | } |
Hemant Kulkarni | 927bbc2 | 2012-09-14 16:11:34 +0000 | [diff] [blame] | 2004 | |
| 2005 | private: |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 2006 | SectionMapT _sectionMap; |
| 2007 | MergedSectionMapT _mergedSectionMap; |
| 2008 | SegmentMapT _segmentMap; |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 2009 | std::vector<Chunk<target_endianness, max_align, is64Bits> *> _sections; |
| 2010 | std::vector<Segment<target_endianness, max_align, is64Bits> *> _segments; |
| 2011 | std::vector<MergedSections<target_endianness, max_align, is64Bits> *> |
| 2012 | _mergedSections; |
| 2013 | ELFHeader<target_endianness, max_align, is64Bits> *_elfHeader; |
| 2014 | ELFProgramHeader<target_endianness, max_align, is64Bits> *_programHeader; |
Shankar Easwaran | 2ca8e7d | 2013-01-10 03:16:27 +0000 | [diff] [blame] | 2015 | std::vector<AbsoluteAtomPair> _absoluteAtoms; |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 2016 | llvm::BumpPtrAllocator _allocator; |
| 2017 | const WriterOptionsELF &_options; |
Hemant Kulkarni | 927bbc2 | 2012-09-14 16:11:34 +0000 | [diff] [blame] | 2018 | }; |
| 2019 | |
| 2020 | //===----------------------------------------------------------------------===// |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 2021 | // ELFExecutableWriter Class |
Hemant Kulkarni | 927bbc2 | 2012-09-14 16:11:34 +0000 | [diff] [blame] | 2022 | //===----------------------------------------------------------------------===// |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 2023 | template<support::endianness target_endianness, |
| 2024 | std::size_t max_align, |
| 2025 | bool is64Bits> |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 2026 | class ELFExecutableWriter : public ELFWriter { |
| 2027 | public: |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 2028 | typedef Elf_Shdr_Impl<target_endianness, max_align, is64Bits> Elf_Shdr; |
| 2029 | typedef Elf_Sym_Impl<target_endianness, max_align, is64Bits> Elf_Sym; |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 2030 | |
| 2031 | ELFExecutableWriter(const WriterOptionsELF &options); |
| 2032 | |
| 2033 | private: |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 2034 | // build the sections that need to be created |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 2035 | void buildChunks(const lld::File &file); |
| 2036 | virtual error_code writeFile(const lld::File &File, StringRef path); |
| 2037 | void buildAtomToAddressMap(); |
| 2038 | void buildSymbolTable (); |
| 2039 | void buildSectionHeaderTable(); |
| 2040 | void assignSectionsWithNoSegments(); |
| 2041 | void addAbsoluteUndefinedSymbols(const lld::File &File); |
Shankar Easwaran | 2ca8e7d | 2013-01-10 03:16:27 +0000 | [diff] [blame] | 2042 | void addDefaultAtoms(); |
| 2043 | void addFiles(InputFiles&); |
| 2044 | void finalizeDefaultAtomValues(); |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 2045 | |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 2046 | uint64_t addressOfAtom(const Atom *atom) { |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 2047 | return _atomToAddressMap[atom]; |
| 2048 | } |
| 2049 | |
| 2050 | KindHandler *kindHandler() { return _referenceKindHandler.get(); } |
| 2051 | |
| 2052 | void createDefaultSections(); |
| 2053 | |
| 2054 | const WriterOptionsELF &_options; |
| 2055 | |
| 2056 | typedef llvm::DenseMap<const Atom*, uint64_t> AtomToAddress; |
| 2057 | std::unique_ptr<KindHandler> _referenceKindHandler; |
| 2058 | AtomToAddress _atomToAddressMap; |
| 2059 | llvm::BumpPtrAllocator _chunkAllocate; |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 2060 | DefaultELFLayout<target_endianness, max_align, is64Bits> *_layout; |
| 2061 | ELFHeader<target_endianness, max_align, is64Bits> *_elfHeader; |
| 2062 | ELFProgramHeader<target_endianness, max_align, is64Bits> *_programHeader; |
| 2063 | ELFSymbolTable<target_endianness, max_align, is64Bits> * _symtab; |
| 2064 | ELFStringTable<target_endianness, max_align, is64Bits> *_strtab; |
| 2065 | ELFStringTable<target_endianness, max_align, is64Bits> *_shstrtab; |
| 2066 | ELFSectionHeader<target_endianness, max_align, is64Bits> *_shdrtab; |
Shankar Easwaran | 2ca8e7d | 2013-01-10 03:16:27 +0000 | [diff] [blame] | 2067 | CRuntimeFile<target_endianness, max_align, is64Bits> _runtimeFile; |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 2068 | }; |
| 2069 | |
| 2070 | //===----------------------------------------------------------------------===// |
| 2071 | // ELFExecutableWriter |
| 2072 | //===----------------------------------------------------------------------===// |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 2073 | template<support::endianness target_endianness, |
| 2074 | std::size_t max_align, |
| 2075 | bool is64Bits> |
| 2076 | ELFExecutableWriter<target_endianness, max_align, is64Bits> |
| 2077 | ::ELFExecutableWriter(const WriterOptionsELF &options) |
Hemant Kulkarni | 927bbc2 | 2012-09-14 16:11:34 +0000 | [diff] [blame] | 2078 | : _options(options) |
Sid Manning | 42064e5 | 2012-10-09 02:20:47 +0000 | [diff] [blame] | 2079 | , _referenceKindHandler(KindHandler::makeHandler(_options.machine(), |
Shankar Easwaran | 2ca8e7d | 2013-01-10 03:16:27 +0000 | [diff] [blame] | 2080 | target_endianness)) |
| 2081 | , _runtimeFile(options) { |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 2082 | _layout = |
| 2083 | new DefaultELFLayout<target_endianness, max_align, is64Bits>(options); |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 2084 | } |
Hemant Kulkarni | 927bbc2 | 2012-09-14 16:11:34 +0000 | [diff] [blame] | 2085 | |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 2086 | template<support::endianness target_endianness, |
| 2087 | std::size_t max_align, |
| 2088 | bool is64Bits> |
| 2089 | void ELFExecutableWriter<target_endianness, max_align, is64Bits> |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 2090 | ::buildChunks(const lld::File &file){ |
| 2091 | for (const DefinedAtom *definedAtom : file.defined() ) { |
| 2092 | _layout->addAtom(definedAtom); |
| 2093 | } |
Shankar Easwaran | 2ca8e7d | 2013-01-10 03:16:27 +0000 | [diff] [blame] | 2094 | /// Add all the absolute atoms to the layout |
| 2095 | for (const AbsoluteAtom *absoluteAtom : file.absolute()) { |
| 2096 | _layout->addAtom(absoluteAtom); |
| 2097 | } |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 2098 | } |
| 2099 | |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 2100 | template<support::endianness target_endianness, |
| 2101 | std::size_t max_align, |
| 2102 | bool is64Bits> |
| 2103 | void ELFExecutableWriter<target_endianness, max_align, is64Bits> |
| 2104 | ::buildSymbolTable () { |
| 2105 | Section<target_endianness, max_align, is64Bits> *section; |
| 2106 | for (auto si = _layout->sections_begin(); si != _layout->sections_end(); |
| 2107 | ++si) { |
| 2108 | if ((*si)->kind() != |
| 2109 | Chunk<target_endianness, max_align, is64Bits>::K_ELFSection) |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 2110 | continue; |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 2111 | section = |
| 2112 | llvm::dyn_cast<Section<target_endianness, max_align, is64Bits>>(*si); |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 2113 | for (auto ai = section->atoms_begin(); ai != section->atoms_end(); ++ai) { |
| 2114 | _symtab->addSymbol(ai->first, section->ordinal(), ai->second.second); |
Hemant Kulkarni | 736f7fb | 2012-11-21 21:07:36 +0000 | [diff] [blame] | 2115 | } |
| 2116 | } |
Hemant Kulkarni | 927bbc2 | 2012-09-14 16:11:34 +0000 | [diff] [blame] | 2117 | } |
| 2118 | |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 2119 | template<support::endianness target_endianness, |
| 2120 | std::size_t max_align, |
| 2121 | bool is64Bits> |
| 2122 | void ELFExecutableWriter<target_endianness, max_align, is64Bits> |
| 2123 | ::addAbsoluteUndefinedSymbols(const lld::File &file) { |
Shankar Easwaran | 2ca8e7d | 2013-01-10 03:16:27 +0000 | [diff] [blame] | 2124 | /// add all the absolute symbols that the layout contains to the output symbol |
| 2125 | /// table |
| 2126 | for (auto absi = _layout->absAtomsBegin(), abse = _layout->absAtomsEnd(); |
| 2127 | absi != abse; ++absi) { |
| 2128 | _symtab->addSymbol(absi->absoluteAtom(), ELF::SHN_ABS, absi->value()); |
| 2129 | } |
Hemant Kulkarni | 08e41029 | 2012-10-01 23:53:20 +0000 | [diff] [blame] | 2130 | for (const UndefinedAtom *a : file.undefined()) { |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 2131 | _symtab->addSymbol(a, ELF::SHN_UNDEF); |
Hemant Kulkarni | 08e41029 | 2012-10-01 23:53:20 +0000 | [diff] [blame] | 2132 | } |
Hemant Kulkarni | 927bbc2 | 2012-09-14 16:11:34 +0000 | [diff] [blame] | 2133 | } |
| 2134 | |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 2135 | template<support::endianness target_endianness, |
| 2136 | std::size_t max_align, |
| 2137 | bool is64Bits> |
| 2138 | void ELFExecutableWriter<target_endianness, max_align, is64Bits> |
| 2139 | ::buildAtomToAddressMap () { |
| 2140 | Section<target_endianness, max_align, is64Bits> *section; |
| 2141 | for (auto si = _layout->sections_begin(); |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 2142 | si != _layout->sections_end(); ++si) { |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 2143 | if ((*si)->kind() != |
| 2144 | Chunk<target_endianness, max_align, is64Bits>::K_ELFSection) |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 2145 | continue; |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 2146 | section = |
| 2147 | llvm::dyn_cast<Section<target_endianness, max_align, is64Bits>>(*si); |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 2148 | for (auto ai = section->atoms_begin(); ai != section->atoms_end(); ++ai) { |
| 2149 | _atomToAddressMap[ai->first] = (ai)->second.second; |
Sid Manning | dd11020 | 2012-09-25 18:22:09 +0000 | [diff] [blame] | 2150 | } |
| 2151 | } |
Shankar Easwaran | 2ca8e7d | 2013-01-10 03:16:27 +0000 | [diff] [blame] | 2152 | /// build the atomToAddressMap that contains absolute symbols too |
| 2153 | for (auto absi = _layout->absAtomsBegin(), abse = _layout->absAtomsEnd(); |
| 2154 | absi != abse; ++absi) { |
| 2155 | _atomToAddressMap[absi->absoluteAtom()] = absi->value(); |
| 2156 | } |
Sid Manning | dd11020 | 2012-09-25 18:22:09 +0000 | [diff] [blame] | 2157 | } |
Hemant Kulkarni | 927bbc2 | 2012-09-14 16:11:34 +0000 | [diff] [blame] | 2158 | |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 2159 | template<support::endianness target_endianness, |
| 2160 | std::size_t max_align, |
| 2161 | bool is64Bits> |
| 2162 | void ELFExecutableWriter<target_endianness, max_align, is64Bits> |
| 2163 | ::buildSectionHeaderTable() { |
| 2164 | for (auto msi = _layout->merged_sections_begin(); |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 2165 | msi != _layout->merged_sections_end(); ++msi) { |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 2166 | if ((*msi)->kind() != |
| 2167 | Chunk<target_endianness, max_align, is64Bits>::K_ELFSection) |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 2168 | continue; |
| 2169 | if ((*msi)->hasSegment()) |
| 2170 | _shdrtab->appendSection(*msi); |
Hemant Kulkarni | 927bbc2 | 2012-09-14 16:11:34 +0000 | [diff] [blame] | 2171 | } |
Hemant Kulkarni | 927bbc2 | 2012-09-14 16:11:34 +0000 | [diff] [blame] | 2172 | } |
| 2173 | |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 2174 | template<support::endianness target_endianness, |
| 2175 | std::size_t max_align, |
| 2176 | bool is64Bits> |
| 2177 | void ELFExecutableWriter<target_endianness, max_align, is64Bits> |
| 2178 | ::assignSectionsWithNoSegments() { |
| 2179 | Section<target_endianness, max_align, is64Bits> *section; |
| 2180 | for (auto msi = _layout->merged_sections_begin(); |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 2181 | msi != _layout->merged_sections_end(); ++msi) { |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 2182 | if ((*msi)->kind() != |
| 2183 | Chunk<target_endianness, max_align, is64Bits>::K_ELFSection) |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 2184 | continue; |
| 2185 | if (!(*msi)->hasSegment()) |
| 2186 | _shdrtab->appendSection(*msi); |
| 2187 | } |
| 2188 | _layout->assignOffsetsForMiscSections(); |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 2189 | for (auto si = _layout->sections_begin(); |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 2190 | si != _layout->sections_end(); ++si) { |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 2191 | if ((*si)->kind() != |
| 2192 | Chunk<target_endianness, max_align, is64Bits>::K_ELFSection) |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 2193 | continue; |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 2194 | section = |
| 2195 | llvm::dyn_cast<Section<target_endianness, max_align, is64Bits>>(*si); |
| 2196 | if (!DefaultELFLayout<target_endianness, max_align, is64Bits> |
| 2197 | ::hasOutputSegment(section)) |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 2198 | _shdrtab->updateSection(section); |
| 2199 | } |
| 2200 | } |
| 2201 | |
Shankar Easwaran | 2ca8e7d | 2013-01-10 03:16:27 +0000 | [diff] [blame] | 2202 | /// \brief Add absolute symbols by default. These are linker added |
| 2203 | /// absolute symbols |
| 2204 | template<support::endianness target_endianness, |
| 2205 | std::size_t max_align, |
| 2206 | bool is64Bits> |
| 2207 | void ELFExecutableWriter<target_endianness, max_align, is64Bits> |
| 2208 | ::addDefaultAtoms() { |
| 2209 | _runtimeFile.addUndefinedAtom("_start"); |
| 2210 | _runtimeFile.addAbsoluteAtom("__bss_start"); |
| 2211 | _runtimeFile.addAbsoluteAtom("__bss_end"); |
| 2212 | _runtimeFile.addAbsoluteAtom("_end"); |
| 2213 | _runtimeFile.addAbsoluteAtom("end"); |
| 2214 | } |
| 2215 | |
| 2216 | /// \brief Hook in lld to add CRuntime file |
| 2217 | template<support::endianness target_endianness, |
| 2218 | std::size_t max_align, |
| 2219 | bool is64Bits> |
| 2220 | void ELFExecutableWriter<target_endianness, max_align, is64Bits> |
| 2221 | ::addFiles(InputFiles &inputFiles) { |
| 2222 | addDefaultAtoms(); |
| 2223 | inputFiles.prependFile(_runtimeFile); |
| 2224 | } |
| 2225 | |
| 2226 | /// Finalize the value of all the absolute symbols that we |
| 2227 | /// created |
| 2228 | template<support::endianness target_endianness, |
| 2229 | std::size_t max_align, |
| 2230 | bool is64Bits> |
| 2231 | void ELFExecutableWriter<target_endianness, max_align, is64Bits> |
| 2232 | ::finalizeDefaultAtomValues() { |
| 2233 | auto abse = _layout->absAtomsEnd(); |
| 2234 | auto bssStartAtomIter = _layout->findAbsoluteAtom("__bss_start"); |
| 2235 | auto bssEndAtomIter = _layout->findAbsoluteAtom("__bss_end"); |
| 2236 | auto underScoreEndAtomIter = _layout->findAbsoluteAtom("_end"); |
| 2237 | auto endAtomIter = _layout->findAbsoluteAtom("end"); |
| 2238 | |
Shankar Easwaran | 37c5282 | 2013-01-10 18:16:10 +0000 | [diff] [blame^] | 2239 | assert(!(bssStartAtomIter == abse || |
| 2240 | bssEndAtomIter == abse || |
| 2241 | underScoreEndAtomIter == abse || |
| 2242 | endAtomIter == abse) && |
| 2243 | "Unable to find the absolute atoms that have been added by lld"); |
Shankar Easwaran | 2ca8e7d | 2013-01-10 03:16:27 +0000 | [diff] [blame] | 2244 | |
| 2245 | auto phe = _programHeader->findProgramHeader( |
| 2246 | llvm::ELF::PT_LOAD, |
| 2247 | llvm::ELF::PF_W, |
| 2248 | llvm::ELF::PF_X); |
| 2249 | |
Shankar Easwaran | 37c5282 | 2013-01-10 18:16:10 +0000 | [diff] [blame^] | 2250 | assert(!(phe == _programHeader->end()) && |
| 2251 | "Can't find a data segment in the program header!"); |
Shankar Easwaran | 2ca8e7d | 2013-01-10 03:16:27 +0000 | [diff] [blame] | 2252 | |
| 2253 | bssStartAtomIter->setValue((*phe)->p_vaddr+(*phe)->p_filesz); |
| 2254 | bssEndAtomIter->setValue((*phe)->p_vaddr+(*phe)->p_memsz); |
| 2255 | underScoreEndAtomIter->setValue((*phe)->p_vaddr+(*phe)->p_memsz); |
| 2256 | endAtomIter->setValue((*phe)->p_vaddr+(*phe)->p_memsz); |
| 2257 | } |
| 2258 | |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 2259 | template<support::endianness target_endianness, |
| 2260 | std::size_t max_align, |
| 2261 | bool is64Bits> |
| 2262 | error_code ELFExecutableWriter<target_endianness, max_align, is64Bits> |
| 2263 | ::writeFile(const lld::File &file, StringRef path) { |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 2264 | buildChunks(file); |
| 2265 | // Create the default sections like the symbol table, string table, and the |
| 2266 | // section string table |
| 2267 | createDefaultSections(); |
Hemant Kulkarni | 927bbc2 | 2012-09-14 16:11:34 +0000 | [diff] [blame] | 2268 | |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 2269 | // Set the Layout |
| 2270 | _layout->assignSectionsToSegments(); |
| 2271 | _layout->assignFileOffsets(); |
| 2272 | _layout->assignVirtualAddress(); |
| 2273 | |
Shankar Easwaran | 2ca8e7d | 2013-01-10 03:16:27 +0000 | [diff] [blame] | 2274 | // Finalize the default value of symbols that the linker adds |
| 2275 | finalizeDefaultAtomValues(); |
| 2276 | |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 2277 | // Build the Atom To Address map for applying relocations |
| 2278 | buildAtomToAddressMap(); |
| 2279 | |
| 2280 | // Create symbol table and section string table |
| 2281 | buildSymbolTable(); |
| 2282 | |
| 2283 | // add other symbols |
| 2284 | addAbsoluteUndefinedSymbols(file); |
| 2285 | |
| 2286 | // Finalize the layout by calling the finalize() functions |
| 2287 | _layout->finalize(); |
| 2288 | |
| 2289 | // build Section Header table |
| 2290 | buildSectionHeaderTable(); |
| 2291 | |
| 2292 | // assign Offsets and virtual addresses |
| 2293 | // for sections with no segments |
| 2294 | assignSectionsWithNoSegments(); |
| 2295 | |
| 2296 | uint64_t totalSize = _shdrtab->fileOffset() + _shdrtab->fileSize(); |
Hemant Kulkarni | 927bbc2 | 2012-09-14 16:11:34 +0000 | [diff] [blame] | 2297 | |
| 2298 | OwningPtr<FileOutputBuffer> buffer; |
| 2299 | error_code ec = FileOutputBuffer::create(path, |
| 2300 | totalSize, buffer, |
| 2301 | FileOutputBuffer::F_executable); |
| 2302 | if (ec) |
| 2303 | return ec; |
| 2304 | |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 2305 | _elfHeader->e_ident(ELF::EI_CLASS, (_options.is64Bit() ? ELF::ELFCLASS64 |
| 2306 | : ELF::ELFCLASS32)); |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 2307 | _elfHeader->e_ident(ELF::EI_DATA, _options.endianness() == llvm::support::big |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 2308 | ? ELF::ELFDATA2MSB : ELF::ELFDATA2LSB); |
| 2309 | _elfHeader->e_ident(ELF::EI_VERSION, 1); |
| 2310 | _elfHeader->e_ident(ELF::EI_OSABI, 0); |
| 2311 | _elfHeader->e_type(_options.type()); |
| 2312 | _elfHeader->e_machine(_options.machine()); |
| 2313 | _elfHeader->e_version(1); |
| 2314 | _elfHeader->e_entry(0ULL); |
| 2315 | _elfHeader->e_phoff(_programHeader->fileOffset()); |
| 2316 | _elfHeader->e_shoff(_shdrtab->fileOffset()); |
| 2317 | _elfHeader->e_phentsize(_programHeader->entsize()); |
| 2318 | _elfHeader->e_phnum(_programHeader->numHeaders()); |
| 2319 | _elfHeader->e_shentsize(_shdrtab->entsize()); |
| 2320 | _elfHeader->e_shnum(_shdrtab->numHeaders()); |
| 2321 | _elfHeader->e_shstrndx(_shstrtab->ordinal()); |
| 2322 | uint64_t virtualAddr = 0; |
| 2323 | _layout->findAtomAddrByName("_start", virtualAddr); |
| 2324 | _elfHeader->e_entry(virtualAddr); |
Michael J. Spencer | 1ac382f0 | 2013-01-07 08:00:04 +0000 | [diff] [blame] | 2325 | |
| 2326 | // HACK: We have to write out the header and program header here even though |
| 2327 | // they are a member of a segment because only sections are written in the |
| 2328 | // following loop. |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 2329 | _elfHeader->write(this, buffer); |
| 2330 | _programHeader->write(this, buffer); |
| 2331 | |
Michael J. Spencer | 1ac382f0 | 2013-01-07 08:00:04 +0000 | [diff] [blame] | 2332 | for (auto si = _layout->sections_begin(); si != _layout->sections_end(); ++si) |
| 2333 | (*si)->write(this, buffer); |
| 2334 | |
Hemant Kulkarni | 927bbc2 | 2012-09-14 16:11:34 +0000 | [diff] [blame] | 2335 | return buffer->commit(); |
| 2336 | } |
Nick Kledzik | abb6981 | 2012-05-31 22:34:00 +0000 | [diff] [blame] | 2337 | |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 2338 | template<support::endianness target_endianness, |
| 2339 | std::size_t max_align, |
| 2340 | bool is64Bits> |
| 2341 | void ELFExecutableWriter<target_endianness, max_align, is64Bits> |
| 2342 | ::createDefaultSections() { |
| 2343 | _elfHeader = |
| 2344 | new ELFHeader<target_endianness, max_align, is64Bits>(); |
| 2345 | _programHeader = |
| 2346 | new ELFProgramHeader<target_endianness, max_align, is64Bits>(); |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 2347 | _layout->setELFHeader(_elfHeader); |
| 2348 | _layout->setProgramHeader(_programHeader); |
| 2349 | |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 2350 | _symtab = new ELFSymbolTable<target_endianness, max_align, is64Bits>( |
| 2351 | ".symtab", |
| 2352 | DefaultELFLayout<target_endianness, max_align, is64Bits> |
| 2353 | ::ORDER_SYMBOL_TABLE); |
| 2354 | _strtab = new ELFStringTable<target_endianness, max_align, is64Bits>( |
| 2355 | ".strtab", |
| 2356 | DefaultELFLayout<target_endianness, max_align, is64Bits> |
| 2357 | ::ORDER_STRING_TABLE); |
| 2358 | _shstrtab = new ELFStringTable<target_endianness, max_align, is64Bits>( |
| 2359 | ".shstrtab", |
| 2360 | DefaultELFLayout<target_endianness, max_align, is64Bits> |
| 2361 | ::ORDER_SECTION_STRINGS); |
| 2362 | _shdrtab = new ELFSectionHeader<target_endianness, max_align, is64Bits>( |
| 2363 | DefaultELFLayout<target_endianness, max_align, is64Bits> |
| 2364 | ::ORDER_SECTION_HEADERS); |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 2365 | _layout->addSection(_symtab); |
| 2366 | _layout->addSection(_strtab); |
| 2367 | _layout->addSection(_shstrtab); |
| 2368 | _shdrtab->setStringSection(_shstrtab); |
| 2369 | _symtab->setStringSection(_strtab); |
| 2370 | _layout->addSection(_shdrtab); |
Sid Manning | dd11020 | 2012-09-25 18:22:09 +0000 | [diff] [blame] | 2371 | } |
Nick Kledzik | abb6981 | 2012-05-31 22:34:00 +0000 | [diff] [blame] | 2372 | } // namespace elf |
| 2373 | |
Hemant Kulkarni | 927bbc2 | 2012-09-14 16:11:34 +0000 | [diff] [blame] | 2374 | Writer *createWriterELF(const WriterOptionsELF &options) { |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 2375 | // Set the default layout to be the static executable layout |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 2376 | // We would set the layout to a dynamic executable layout |
Shankar Easwaran | 495d38b | 2012-12-27 02:26:30 +0000 | [diff] [blame] | 2377 | // if we came across any shared libraries in the process |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 2378 | |
Hemant Kulkarni | 927bbc2 | 2012-09-14 16:11:34 +0000 | [diff] [blame] | 2379 | if (!options.is64Bit() && options.endianness() == llvm::support::little) |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 2380 | return new elf::ELFExecutableWriter<support::little, 4, false>(options); |
Hemant Kulkarni | 927bbc2 | 2012-09-14 16:11:34 +0000 | [diff] [blame] | 2381 | else if (options.is64Bit() && options.endianness() == llvm::support::little) |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 2382 | return new elf::ELFExecutableWriter<support::little, 8, true>(options); |
Hemant Kulkarni | 927bbc2 | 2012-09-14 16:11:34 +0000 | [diff] [blame] | 2383 | else if (!options.is64Bit() && options.endianness() == llvm::support::big) |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 2384 | return new elf::ELFExecutableWriter<support::big, 4, false>(options); |
Hemant Kulkarni | 927bbc2 | 2012-09-14 16:11:34 +0000 | [diff] [blame] | 2385 | else if (options.is64Bit() && options.endianness() == llvm::support::big) |
Michael J. Spencer | a2c9727 | 2013-01-04 21:09:21 +0000 | [diff] [blame] | 2386 | return new elf::ELFExecutableWriter<support::big, 8, true>(options); |
Nick Kledzik | abb6981 | 2012-05-31 22:34:00 +0000 | [diff] [blame] | 2387 | |
Hemant Kulkarni | 927bbc2 | 2012-09-14 16:11:34 +0000 | [diff] [blame] | 2388 | llvm_unreachable("Invalid Options!"); |
Nick Kledzik | abb6981 | 2012-05-31 22:34:00 +0000 | [diff] [blame] | 2389 | } |
Nick Kledzik | abb6981 | 2012-05-31 22:34:00 +0000 | [diff] [blame] | 2390 | } // namespace lld |