1 //===-------------- MachO.cpp - JIT linker function for MachO -------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // MachO jit-link function. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #include "llvm/ExecutionEngine/JITLink/MachO.h" 15 16 #include "llvm/BinaryFormat/MachO.h" 17 #include "llvm/ExecutionEngine/JITLink/MachO_arm64.h" 18 #include "llvm/ExecutionEngine/JITLink/MachO_x86_64.h" 19 #include "llvm/Support/Endian.h" 20 #include "llvm/Support/Format.h" 21 #include "llvm/Support/MemoryBuffer.h" 22 23 using namespace llvm; 24 25 #define DEBUG_TYPE "jitlink" 26 27 namespace llvm { 28 namespace jitlink { 29 30 void jitLink_MachO(std::unique_ptr<JITLinkContext> Ctx) { 31 32 // We don't want to do full MachO validation here. Just parse enough of the 33 // header to find out what MachO linker to use. 34 35 StringRef Data = Ctx->getObjectBuffer().getBuffer(); 36 if (Data.size() < 4) { 37 Ctx->notifyFailed(make_error<JITLinkError>("Truncated MachO buffer")); 38 return; 39 } 40 41 uint32_t Magic; 42 memcpy(&Magic, Data.data(), sizeof(uint32_t)); 43 LLVM_DEBUG({ 44 dbgs() << "jitLink_MachO: magic = " << format("0x%08" PRIx32, Magic) 45 << ", identifier = \"" 46 << Ctx->getObjectBuffer().getBufferIdentifier() << "\"\n"; 47 }); 48 49 if (Magic == MachO::MH_MAGIC || Magic == MachO::MH_CIGAM) { 50 Ctx->notifyFailed( 51 make_error<JITLinkError>("MachO 32-bit platforms not supported")); 52 return; 53 } else if (Magic == MachO::MH_MAGIC_64 || Magic == MachO::MH_CIGAM_64) { 54 MachO::mach_header_64 Header; 55 56 memcpy(&Header, Data.data(), sizeof(MachO::mach_header_64)); 57 if (Magic == MachO::MH_CIGAM_64) 58 swapStruct(Header); 59 60 LLVM_DEBUG({ 61 dbgs() << "jitLink_MachO: cputype = " 62 << format("0x%08" PRIx32, Header.cputype) 63 << ", cpusubtype = " << format("0x%08" PRIx32, Header.cpusubtype) 64 << "\n"; 65 }); 66 67 switch (Header.cputype) { 68 case MachO::CPU_TYPE_ARM64: 69 return jitLink_MachO_arm64(std::move(Ctx)); 70 case MachO::CPU_TYPE_X86_64: 71 return jitLink_MachO_x86_64(std::move(Ctx)); 72 } 73 Ctx->notifyFailed(make_error<JITLinkError>("MachO-64 CPU type not valid")); 74 return; 75 } 76 77 Ctx->notifyFailed(make_error<JITLinkError>("MachO magic not valid")); 78 } 79 80 } // end namespace jitlink 81 } // end namespace llvm 82