forked from OSchip/llvm-project
214 lines
6.9 KiB
C++
214 lines
6.9 KiB
C++
//===- lib/ReaderWriter/MachO/MachONormalizedFileBinaryUtils.h ------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLD_READER_WRITER_MACHO_NORMALIZED_FILE_BINARY_UTILS_H
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#define LLD_READER_WRITER_MACHO_NORMALIZED_FILE_BINARY_UTILS_H
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#include "MachONormalizedFile.h"
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#include "lld/Common/LLVM.h"
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#include "lld/Core/Error.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/BinaryFormat/MachO.h"
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#include "llvm/Support/Casting.h"
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#include "llvm/Support/Endian.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/Host.h"
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#include "llvm/Support/LEB128.h"
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#include <system_error>
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namespace lld {
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namespace mach_o {
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namespace normalized {
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class ByteBuffer {
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public:
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ByteBuffer() : _ostream(_bytes) { }
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void append_byte(uint8_t b) {
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_ostream << b;
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}
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void append_uleb128(uint64_t value) {
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llvm::encodeULEB128(value, _ostream);
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}
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void append_uleb128Fixed(uint64_t value, unsigned byteCount) {
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unsigned min = llvm::getULEB128Size(value);
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assert(min <= byteCount);
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unsigned pad = byteCount - min;
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llvm::encodeULEB128(value, _ostream, pad);
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}
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void append_sleb128(int64_t value) {
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llvm::encodeSLEB128(value, _ostream);
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}
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void append_string(StringRef str) {
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_ostream << str;
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append_byte(0);
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}
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void align(unsigned alignment) {
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while ( (_ostream.tell() % alignment) != 0 )
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append_byte(0);
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}
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size_t size() {
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return _ostream.tell();
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}
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const uint8_t *bytes() {
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return reinterpret_cast<const uint8_t*>(_ostream.str().data());
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}
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private:
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SmallVector<char, 128> _bytes;
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// Stream ivar must be after SmallVector ivar to construct properly.
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llvm::raw_svector_ostream _ostream;
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};
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using namespace llvm::support::endian;
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using llvm::sys::getSwappedBytes;
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template<typename T>
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static inline uint16_t read16(const T *loc, bool isBig) {
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assert((uint64_t)loc % alignof(T) == 0 && "invalid pointer alignment");
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return isBig ? read16be(loc) : read16le(loc);
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}
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template<typename T>
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static inline uint32_t read32(const T *loc, bool isBig) {
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assert((uint64_t)loc % alignof(T) == 0 && "invalid pointer alignment");
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return isBig ? read32be(loc) : read32le(loc);
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}
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template<typename T>
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static inline uint64_t read64(const T *loc, bool isBig) {
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assert((uint64_t)loc % alignof(T) == 0 && "invalid pointer alignment");
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return isBig ? read64be(loc) : read64le(loc);
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}
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inline void write16(uint8_t *loc, uint16_t value, bool isBig) {
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if (isBig)
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write16be(loc, value);
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else
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write16le(loc, value);
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}
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inline void write32(uint8_t *loc, uint32_t value, bool isBig) {
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if (isBig)
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write32be(loc, value);
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else
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write32le(loc, value);
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}
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inline void write64(uint8_t *loc, uint64_t value, bool isBig) {
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if (isBig)
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write64be(loc, value);
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else
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write64le(loc, value);
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}
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inline uint32_t
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bitFieldExtract(uint32_t value, bool isBigEndianBigField, uint8_t firstBit,
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uint8_t bitCount) {
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const uint32_t mask = ((1<<bitCount)-1);
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const uint8_t shift = isBigEndianBigField ? (32-firstBit-bitCount) : firstBit;
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return (value >> shift) & mask;
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}
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inline void
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bitFieldSet(uint32_t &bits, bool isBigEndianBigField, uint32_t newBits,
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uint8_t firstBit, uint8_t bitCount) {
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const uint32_t mask = ((1<<bitCount)-1);
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assert((newBits & mask) == newBits);
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const uint8_t shift = isBigEndianBigField ? (32-firstBit-bitCount) : firstBit;
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bits &= ~(mask << shift);
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bits |= (newBits << shift);
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}
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inline Relocation unpackRelocation(const llvm::MachO::any_relocation_info &r,
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bool isBigEndian) {
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uint32_t r0 = read32(&r.r_word0, isBigEndian);
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uint32_t r1 = read32(&r.r_word1, isBigEndian);
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Relocation result;
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if (r0 & llvm::MachO::R_SCATTERED) {
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// scattered relocation record always laid out like big endian bit field
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result.offset = bitFieldExtract(r0, true, 8, 24);
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result.scattered = true;
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result.type = (RelocationInfoType)
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bitFieldExtract(r0, true, 4, 4);
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result.length = bitFieldExtract(r0, true, 2, 2);
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result.pcRel = bitFieldExtract(r0, true, 1, 1);
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result.isExtern = false;
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result.value = r1;
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result.symbol = 0;
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} else {
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result.offset = r0;
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result.scattered = false;
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result.type = (RelocationInfoType)
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bitFieldExtract(r1, isBigEndian, 28, 4);
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result.length = bitFieldExtract(r1, isBigEndian, 25, 2);
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result.pcRel = bitFieldExtract(r1, isBigEndian, 24, 1);
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result.isExtern = bitFieldExtract(r1, isBigEndian, 27, 1);
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result.value = 0;
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result.symbol = bitFieldExtract(r1, isBigEndian, 0, 24);
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}
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return result;
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}
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inline llvm::MachO::any_relocation_info
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packRelocation(const Relocation &r, bool swap, bool isBigEndian) {
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uint32_t r0 = 0;
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uint32_t r1 = 0;
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if (r.scattered) {
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r1 = r.value;
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bitFieldSet(r0, true, r.offset, 8, 24);
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bitFieldSet(r0, true, r.type, 4, 4);
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bitFieldSet(r0, true, r.length, 2, 2);
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bitFieldSet(r0, true, r.pcRel, 1, 1);
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bitFieldSet(r0, true, r.scattered, 0, 1); // R_SCATTERED
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} else {
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r0 = r.offset;
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bitFieldSet(r1, isBigEndian, r.type, 28, 4);
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bitFieldSet(r1, isBigEndian, r.isExtern, 27, 1);
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bitFieldSet(r1, isBigEndian, r.length, 25, 2);
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bitFieldSet(r1, isBigEndian, r.pcRel, 24, 1);
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bitFieldSet(r1, isBigEndian, r.symbol, 0, 24);
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}
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llvm::MachO::any_relocation_info result;
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result.r_word0 = swap ? getSwappedBytes(r0) : r0;
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result.r_word1 = swap ? getSwappedBytes(r1) : r1;
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return result;
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}
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inline StringRef getString16(const char s[16]) {
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// The StringRef(const char *) constructor passes the const char * to
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// strlen(), so we can't use this constructor here, because if there is no
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// null terminator in s, then strlen() will read past the end of the array.
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return StringRef(s, strnlen(s, 16));
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}
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inline void setString16(StringRef str, char s[16]) {
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memset(s, 0, 16);
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memcpy(s, str.begin(), (str.size() > 16) ? 16: str.size());
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}
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// Implemented in normalizedToAtoms() and used by normalizedFromAtoms() so
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// that the same table can be used to map mach-o sections to and from
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// DefinedAtom::ContentType.
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void relocatableSectionInfoForContentType(DefinedAtom::ContentType atomType,
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StringRef &segmentName,
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StringRef §ionName,
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SectionType §ionType,
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SectionAttr §ionAttrs,
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bool &relocsToDefinedCanBeImplicit);
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} // namespace normalized
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} // namespace mach_o
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} // namespace lld
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#endif // LLD_READER_WRITER_MACHO_NORMALIZED_FILE_BINARY_UTILS_H
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