1 //===---- MipsABIInfo.cpp - Information about MIPS ABI's ------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #include "MipsABIInfo.h" 10 #include "MipsRegisterInfo.h" 11 #include "llvm/ADT/StringRef.h" 12 #include "llvm/MC/MCTargetOptions.h" 13 #include "llvm/Support/CommandLine.h" 14 15 using namespace llvm; 16 17 // Note: this option is defined here to be visible from libLLVMMipsAsmParser 18 // and libLLVMMipsCodeGen 19 cl::opt<bool> 20 EmitJalrReloc("mips-jalr-reloc", cl::Hidden, 21 cl::desc("MIPS: Emit R_{MICRO}MIPS_JALR relocation with jalr"), 22 cl::init(true)); 23 24 namespace { 25 static const MCPhysReg O32IntRegs[4] = {Mips::A0, Mips::A1, Mips::A2, Mips::A3}; 26 27 static const MCPhysReg Mips64IntRegs[8] = { 28 Mips::A0_64, Mips::A1_64, Mips::A2_64, Mips::A3_64, 29 Mips::T0_64, Mips::T1_64, Mips::T2_64, Mips::T3_64}; 30 } 31 32 ArrayRef<MCPhysReg> MipsABIInfo::GetByValArgRegs() const { 33 if (IsO32()) 34 return makeArrayRef(O32IntRegs); 35 if (IsN32() || IsN64()) 36 return makeArrayRef(Mips64IntRegs); 37 llvm_unreachable("Unhandled ABI"); 38 } 39 40 ArrayRef<MCPhysReg> MipsABIInfo::GetVarArgRegs() const { 41 if (IsO32()) 42 return makeArrayRef(O32IntRegs); 43 if (IsN32() || IsN64()) 44 return makeArrayRef(Mips64IntRegs); 45 llvm_unreachable("Unhandled ABI"); 46 } 47 48 unsigned MipsABIInfo::GetCalleeAllocdArgSizeInBytes(CallingConv::ID CC) const { 49 if (IsO32()) 50 return CC != CallingConv::Fast ? 16 : 0; 51 if (IsN32() || IsN64()) 52 return 0; 53 llvm_unreachable("Unhandled ABI"); 54 } 55 56 MipsABIInfo MipsABIInfo::computeTargetABI(const Triple &TT, StringRef CPU, 57 const MCTargetOptions &Options) { 58 if (Options.getABIName().startswith("o32")) 59 return MipsABIInfo::O32(); 60 if (Options.getABIName().startswith("n32")) 61 return MipsABIInfo::N32(); 62 if (Options.getABIName().startswith("n64")) 63 return MipsABIInfo::N64(); 64 if (TT.getEnvironment() == llvm::Triple::GNUABIN32) 65 return MipsABIInfo::N32(); 66 assert(Options.getABIName().empty() && "Unknown ABI option for MIPS"); 67 68 if (TT.isMIPS64()) 69 return MipsABIInfo::N64(); 70 return MipsABIInfo::O32(); 71 } 72 73 unsigned MipsABIInfo::GetStackPtr() const { 74 return ArePtrs64bit() ? Mips::SP_64 : Mips::SP; 75 } 76 77 unsigned MipsABIInfo::GetFramePtr() const { 78 return ArePtrs64bit() ? Mips::FP_64 : Mips::FP; 79 } 80 81 unsigned MipsABIInfo::GetBasePtr() const { 82 return ArePtrs64bit() ? Mips::S7_64 : Mips::S7; 83 } 84 85 unsigned MipsABIInfo::GetGlobalPtr() const { 86 return ArePtrs64bit() ? Mips::GP_64 : Mips::GP; 87 } 88 89 unsigned MipsABIInfo::GetNullPtr() const { 90 return ArePtrs64bit() ? Mips::ZERO_64 : Mips::ZERO; 91 } 92 93 unsigned MipsABIInfo::GetZeroReg() const { 94 return AreGprs64bit() ? Mips::ZERO_64 : Mips::ZERO; 95 } 96 97 unsigned MipsABIInfo::GetPtrAdduOp() const { 98 return ArePtrs64bit() ? Mips::DADDu : Mips::ADDu; 99 } 100 101 unsigned MipsABIInfo::GetPtrAddiuOp() const { 102 return ArePtrs64bit() ? Mips::DADDiu : Mips::ADDiu; 103 } 104 105 unsigned MipsABIInfo::GetPtrSubuOp() const { 106 return ArePtrs64bit() ? Mips::DSUBu : Mips::SUBu; 107 } 108 109 unsigned MipsABIInfo::GetPtrAndOp() const { 110 return ArePtrs64bit() ? Mips::AND64 : Mips::AND; 111 } 112 113 unsigned MipsABIInfo::GetGPRMoveOp() const { 114 return ArePtrs64bit() ? Mips::OR64 : Mips::OR; 115 } 116 117 unsigned MipsABIInfo::GetEhDataReg(unsigned I) const { 118 static const unsigned EhDataReg[] = { 119 Mips::A0, Mips::A1, Mips::A2, Mips::A3 120 }; 121 static const unsigned EhDataReg64[] = { 122 Mips::A0_64, Mips::A1_64, Mips::A2_64, Mips::A3_64 123 }; 124 125 return IsN64() ? EhDataReg64[I] : EhDataReg[I]; 126 } 127 128