forked from OSchip/llvm-project
121 lines
4.2 KiB
C++
121 lines
4.2 KiB
C++
//===- Target.h -------------------------------------------------*- C++ -*-===//
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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_MACHO_TARGET_H
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#define LLD_MACHO_TARGET_H
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#include "llvm/ADT/BitmaskEnum.h"
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#include "llvm/BinaryFormat/MachO.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include <cstddef>
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#include <cstdint>
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namespace lld {
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namespace macho {
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LLVM_ENABLE_BITMASK_ENUMS_IN_NAMESPACE();
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class Symbol;
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class DylibSymbol;
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class InputSection;
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struct Reloc;
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enum : uint64_t {
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// We are currently only supporting 64-bit targets since macOS and iOS are
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// deprecating 32-bit apps.
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WordSize = 8,
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PageZeroSize = 1ull << 32, // XXX should be 4096 for 32-bit targets
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MaxAlignmentPowerOf2 = 32,
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};
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enum class RelocAttrBits {
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_0 = 0, // invalid
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PCREL = 1 << 0, // Value is PC-relative offset
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ABSOLUTE = 1 << 1, // Value is an absolute address or fixed offset
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BYTE4 = 1 << 2, // 4 byte datum
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BYTE8 = 1 << 3, // 8 byte datum
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EXTERN = 1 << 4, // Can have an external symbol
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LOCAL = 1 << 5, // Can have a local symbol
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ADDEND = 1 << 6, // *_ADDEND paired prefix reloc
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SUBTRAHEND = 1 << 7, // *_SUBTRACTOR paired prefix reloc
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BRANCH = 1 << 8, // Value is branch target
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GOT = 1 << 9, // References a symbol in the Global Offset Table
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TLV = 1 << 10, // References a thread-local symbol
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DYSYM8 = 1 << 11, // Requires DySym width to be 8 bytes
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LOAD = 1 << 12, // Relaxable indirect load
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POINTER = 1 << 13, // Non-relaxable indirect load (pointer is taken)
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UNSIGNED = 1 << 14, // *_UNSIGNED relocs
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LLVM_MARK_AS_BITMASK_ENUM(/*LargestValue*/ (1 << 15) - 1),
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};
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// Note: SUBTRACTOR always pairs with UNSIGNED (a delta between two symbols).
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class TargetInfo {
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public:
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struct RelocAttrs {
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llvm::StringRef name;
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RelocAttrBits bits;
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bool hasAttr(RelocAttrBits b) const { return (bits & b) == b; }
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};
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static const RelocAttrs invalidRelocAttrs;
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virtual ~TargetInfo() = default;
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// Validate the relocation structure and get its addend.
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virtual uint64_t
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getEmbeddedAddend(llvm::MemoryBufferRef, const llvm::MachO::section_64 &,
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const llvm::MachO::relocation_info) const = 0;
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virtual void relocateOne(uint8_t *loc, const Reloc &, uint64_t va,
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uint64_t pc) const = 0;
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// Write code for lazy binding. See the comments on StubsSection for more
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// details.
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virtual void writeStub(uint8_t *buf, const Symbol &) const = 0;
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virtual void writeStubHelperHeader(uint8_t *buf) const = 0;
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virtual void writeStubHelperEntry(uint8_t *buf, const DylibSymbol &,
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uint64_t entryAddr) const = 0;
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// Symbols may be referenced via either the GOT or the stubs section,
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// depending on the relocation type. prepareSymbolRelocation() will set up the
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// GOT/stubs entries, and resolveSymbolVA() will return the addresses of those
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// entries. resolveSymbolVA() may also relax the target instructions to save
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// on a level of address indirection.
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virtual void relaxGotLoad(uint8_t *loc, uint8_t type) const = 0;
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virtual const RelocAttrs &getRelocAttrs(uint8_t type) const = 0;
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virtual uint64_t getPageSize() const = 0;
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bool hasAttr(uint8_t type, RelocAttrBits bit) const {
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return getRelocAttrs(type).hasAttr(bit);
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}
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bool validateRelocationInfo(llvm::MemoryBufferRef,
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const llvm::MachO::section_64 &sec,
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llvm::MachO::relocation_info);
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bool validateSymbolRelocation(const Symbol *, const InputSection *isec,
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const Reloc &);
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void prepareSymbolRelocation(Symbol *, const InputSection *, const Reloc &);
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uint32_t cpuType;
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uint32_t cpuSubtype;
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size_t stubSize;
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size_t stubHelperHeaderSize;
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size_t stubHelperEntrySize;
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};
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TargetInfo *createX86_64TargetInfo();
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TargetInfo *createARM64TargetInfo();
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extern TargetInfo *target;
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} // namespace macho
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} // namespace lld
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#endif
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