| //===- Target.h -------------------------------------------------*- C++ -*-===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef LLD_MACHO_TARGET_H |
| #define LLD_MACHO_TARGET_H |
| |
| #include "Relocations.h" |
| |
| #include "llvm/ADT/BitmaskEnum.h" |
| #include "llvm/BinaryFormat/MachO.h" |
| #include "llvm/Support/MemoryBuffer.h" |
| |
| #include <cstddef> |
| #include <cstdint> |
| |
| namespace lld { |
| namespace macho { |
| LLVM_ENABLE_BITMASK_ENUMS_IN_NAMESPACE(); |
| |
| class Symbol; |
| class DylibSymbol; |
| class InputSection; |
| |
| enum : uint64_t { |
| // We are currently only supporting 64-bit targets since macOS and iOS are |
| // deprecating 32-bit apps. |
| WordSize = 8, |
| PageZeroSize = 1ull << 32, // XXX should be 4096 for 32-bit targets |
| MaxAlignmentPowerOf2 = 32, |
| }; |
| |
| class TargetInfo { |
| public: |
| virtual ~TargetInfo() = default; |
| |
| // Validate the relocation structure and get its addend. |
| virtual int64_t |
| getEmbeddedAddend(llvm::MemoryBufferRef, const llvm::MachO::section_64 &, |
| const llvm::MachO::relocation_info) const = 0; |
| virtual void relocateOne(uint8_t *loc, const Reloc &, uint64_t va, |
| uint64_t relocVA) const = 0; |
| |
| // Write code for lazy binding. See the comments on StubsSection for more |
| // details. |
| virtual void writeStub(uint8_t *buf, const Symbol &) const = 0; |
| virtual void writeStubHelperHeader(uint8_t *buf) const = 0; |
| virtual void writeStubHelperEntry(uint8_t *buf, const DylibSymbol &, |
| uint64_t entryAddr) const = 0; |
| |
| // Symbols may be referenced via either the GOT or the stubs section, |
| // depending on the relocation type. prepareSymbolRelocation() will set up the |
| // GOT/stubs entries, and resolveSymbolVA() will return the addresses of those |
| // entries. resolveSymbolVA() may also relax the target instructions to save |
| // on a level of address indirection. |
| virtual void relaxGotLoad(uint8_t *loc, uint8_t type) const = 0; |
| |
| virtual const RelocAttrs &getRelocAttrs(uint8_t type) const = 0; |
| |
| virtual uint64_t getPageSize() const = 0; |
| |
| bool hasAttr(uint8_t type, RelocAttrBits bit) const { |
| return getRelocAttrs(type).hasAttr(bit); |
| } |
| |
| uint32_t cpuType; |
| uint32_t cpuSubtype; |
| |
| size_t stubSize; |
| size_t stubHelperHeaderSize; |
| size_t stubHelperEntrySize; |
| }; |
| |
| TargetInfo *createX86_64TargetInfo(); |
| TargetInfo *createARM64TargetInfo(); |
| |
| extern TargetInfo *target; |
| |
| } // namespace macho |
| } // namespace lld |
| |
| #endif |