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1 //===- Target.h -------------------------------------------------*- C++ -*-===//
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2 //
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3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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4 // See https://llvm.org/LICENSE.txt for license information.
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5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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6 //
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7 //===----------------------------------------------------------------------===//
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8
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9 #ifndef LLD_MACHO_TARGET_H
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10 #define LLD_MACHO_TARGET_H
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11
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12 #include <cstddef>
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13 #include <cstdint>
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14
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15 namespace lld {
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16 namespace macho {
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17
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18 class DylibSymbol;
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19
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20 enum {
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21 // We are currently only supporting 64-bit targets since macOS and iOS are
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22 // deprecating 32-bit apps.
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23 WordSize = 8,
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24 PageSize = 4096,
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25 ImageBase = 4096,
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26 MaxAlignmentPowerOf2 = 32,
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27 };
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28
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29 class TargetInfo {
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30 public:
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31 virtual ~TargetInfo() = default;
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32
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33 virtual uint64_t getImplicitAddend(const uint8_t *loc,
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34 uint8_t type) const = 0;
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35 virtual void relocateOne(uint8_t *loc, uint8_t type, uint64_t val) const = 0;
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36
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37 // Write code for lazy binding. See the comments on StubsSection for more
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38 // details.
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39 virtual void writeStub(uint8_t *buf, const DylibSymbol &) const = 0;
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40 virtual void writeStubHelperHeader(uint8_t *buf) const = 0;
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41 virtual void writeStubHelperEntry(uint8_t *buf, const DylibSymbol &,
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42 uint64_t entryAddr) const = 0;
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43
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44 // Dylib symbols are referenced via either the GOT or the stubs section,
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45 // depending on the relocation type. prepareDylibSymbolRelocation() will set
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46 // up the GOT/stubs entries, and getDylibSymbolVA() will return the addresses
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47 // of those entries.
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48 virtual void prepareDylibSymbolRelocation(DylibSymbol &, uint8_t type) = 0;
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49 virtual uint64_t getDylibSymbolVA(const DylibSymbol &,
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50 uint8_t type) const = 0;
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51
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52 uint32_t cpuType;
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53 uint32_t cpuSubtype;
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54
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55 size_t stubSize;
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56 size_t stubHelperHeaderSize;
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57 size_t stubHelperEntrySize;
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58 };
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59
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60 TargetInfo *createX86_64TargetInfo();
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61
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62 extern TargetInfo *target;
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63
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64 } // namespace macho
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65 } // namespace lld
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66
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67 #endif
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