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 "Mips.h"
11 #include "llvm/ADT/StringRef.h"
12 #include "llvm/CodeGenTypes/LowLevelType.h"
13 #include "llvm/MC/MCTargetOptions.h"
14 #include "llvm/Support/CommandLine.h"
15
16 using namespace llvm;
17
18 // Note: this option is defined here to be visible from libLLVMMipsAsmParser
19 // and libLLVMMipsCodeGen
20 cl::opt<bool>
21 EmitJalrReloc("mips-jalr-reloc", cl::Hidden,
22 cl::desc("MIPS: Emit R_{MICRO}MIPS_JALR relocation with jalr"),
23 cl::init(true));
24
25 namespace {
26 static const MCPhysReg O32IntRegs[4] = {Mips::A0, Mips::A1, Mips::A2, Mips::A3};
27
28 static const MCPhysReg Mips64IntRegs[8] = {
29 Mips::A0_64, Mips::A1_64, Mips::A2_64, Mips::A3_64,
30 Mips::T0_64, Mips::T1_64, Mips::T2_64, Mips::T3_64};
31 }
32
GetByValArgRegs() const33 ArrayRef<MCPhysReg> MipsABIInfo::GetByValArgRegs() const {
34 if (IsO32())
35 return ArrayRef(O32IntRegs);
36 if (IsN32() || IsN64())
37 return ArrayRef(Mips64IntRegs);
38 llvm_unreachable("Unhandled ABI");
39 }
40
GetVarArgRegs() const41 ArrayRef<MCPhysReg> MipsABIInfo::GetVarArgRegs() const {
42 if (IsO32())
43 return ArrayRef(O32IntRegs);
44 if (IsN32() || IsN64())
45 return ArrayRef(Mips64IntRegs);
46 llvm_unreachable("Unhandled ABI");
47 }
48
GetCalleeAllocdArgSizeInBytes(CallingConv::ID CC) const49 unsigned MipsABIInfo::GetCalleeAllocdArgSizeInBytes(CallingConv::ID CC) const {
50 if (IsO32())
51 return CC != CallingConv::Fast ? 16 : 0;
52 if (IsN32() || IsN64())
53 return 0;
54 llvm_unreachable("Unhandled ABI");
55 }
56
computeTargetABI(const Triple & TT,StringRef CPU,const MCTargetOptions & Options)57 MipsABIInfo MipsABIInfo::computeTargetABI(const Triple &TT, StringRef CPU,
58 const MCTargetOptions &Options) {
59 if (Options.getABIName().starts_with("o32"))
60 return MipsABIInfo::O32();
61 if (Options.getABIName().starts_with("n32"))
62 return MipsABIInfo::N32();
63 if (Options.getABIName().starts_with("n64"))
64 return MipsABIInfo::N64();
65 if (TT.getEnvironment() == llvm::Triple::GNUABIN32)
66 return MipsABIInfo::N32();
67 assert(Options.getABIName().empty() && "Unknown ABI option for MIPS");
68
69 if (TT.isMIPS64())
70 return MipsABIInfo::N64();
71 return MipsABIInfo::O32();
72 }
73
GetStackPtr() const74 unsigned MipsABIInfo::GetStackPtr() const {
75 return ArePtrs64bit() ? Mips::SP_64 : Mips::SP;
76 }
77
GetFramePtr() const78 unsigned MipsABIInfo::GetFramePtr() const {
79 return ArePtrs64bit() ? Mips::FP_64 : Mips::FP;
80 }
81
GetBasePtr() const82 unsigned MipsABIInfo::GetBasePtr() const {
83 return ArePtrs64bit() ? Mips::S7_64 : Mips::S7;
84 }
85
GetGlobalPtr() const86 unsigned MipsABIInfo::GetGlobalPtr() const {
87 return ArePtrs64bit() ? Mips::GP_64 : Mips::GP;
88 }
89
GetNullPtr() const90 unsigned MipsABIInfo::GetNullPtr() const {
91 return ArePtrs64bit() ? Mips::ZERO_64 : Mips::ZERO;
92 }
93
GetZeroReg() const94 unsigned MipsABIInfo::GetZeroReg() const {
95 return AreGprs64bit() ? Mips::ZERO_64 : Mips::ZERO;
96 }
97
GetPtrAdduOp() const98 unsigned MipsABIInfo::GetPtrAdduOp() const {
99 return ArePtrs64bit() ? Mips::DADDu : Mips::ADDu;
100 }
101
GetPtrAddiuOp() const102 unsigned MipsABIInfo::GetPtrAddiuOp() const {
103 return ArePtrs64bit() ? Mips::DADDiu : Mips::ADDiu;
104 }
105
GetPtrSubuOp() const106 unsigned MipsABIInfo::GetPtrSubuOp() const {
107 return ArePtrs64bit() ? Mips::DSUBu : Mips::SUBu;
108 }
109
GetPtrAndOp() const110 unsigned MipsABIInfo::GetPtrAndOp() const {
111 return ArePtrs64bit() ? Mips::AND64 : Mips::AND;
112 }
113
GetGPRMoveOp() const114 unsigned MipsABIInfo::GetGPRMoveOp() const {
115 return ArePtrs64bit() ? Mips::OR64 : Mips::OR;
116 }
117
GetEhDataReg(unsigned I) const118 unsigned MipsABIInfo::GetEhDataReg(unsigned I) const {
119 static const unsigned EhDataReg[] = {
120 Mips::A0, Mips::A1, Mips::A2, Mips::A3
121 };
122 static const unsigned EhDataReg64[] = {
123 Mips::A0_64, Mips::A1_64, Mips::A2_64, Mips::A3_64
124 };
125
126 return IsN64() ? EhDataReg64[I] : EhDataReg[I];
127 }
128
129