1 //===---- MipsABIInfo.cpp - Information about MIPS ABI's ------------------===//
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 #include "MipsABIInfo.h"
11 #include "MipsRegisterInfo.h"
12 #include "llvm/ADT/StringRef.h"
13 #include "llvm/ADT/StringSwitch.h"
14 #include "llvm/MC/MCTargetOptions.h"
15
16 using namespace llvm;
17
18 namespace {
19 static const MCPhysReg O32IntRegs[4] = {Mips::A0, Mips::A1, Mips::A2, Mips::A3};
20
21 static const MCPhysReg Mips64IntRegs[8] = {
22 Mips::A0_64, Mips::A1_64, Mips::A2_64, Mips::A3_64,
23 Mips::T0_64, Mips::T1_64, Mips::T2_64, Mips::T3_64};
24 }
25
GetByValArgRegs() const26 ArrayRef<MCPhysReg> MipsABIInfo::GetByValArgRegs() const {
27 if (IsO32())
28 return makeArrayRef(O32IntRegs);
29 if (IsN32() || IsN64())
30 return makeArrayRef(Mips64IntRegs);
31 llvm_unreachable("Unhandled ABI");
32 }
33
GetVarArgRegs() const34 ArrayRef<MCPhysReg> MipsABIInfo::GetVarArgRegs() const {
35 if (IsO32())
36 return makeArrayRef(O32IntRegs);
37 if (IsN32() || IsN64())
38 return makeArrayRef(Mips64IntRegs);
39 llvm_unreachable("Unhandled ABI");
40 }
41
GetCalleeAllocdArgSizeInBytes(CallingConv::ID CC) const42 unsigned MipsABIInfo::GetCalleeAllocdArgSizeInBytes(CallingConv::ID CC) const {
43 if (IsO32())
44 return CC != CallingConv::Fast ? 16 : 0;
45 if (IsN32() || IsN64())
46 return 0;
47 llvm_unreachable("Unhandled ABI");
48 }
49
computeTargetABI(const Triple & TT,StringRef CPU,const MCTargetOptions & Options)50 MipsABIInfo MipsABIInfo::computeTargetABI(const Triple &TT, StringRef CPU,
51 const MCTargetOptions &Options) {
52 if (Options.getABIName().startswith("o32"))
53 return MipsABIInfo::O32();
54 if (Options.getABIName().startswith("n32"))
55 return MipsABIInfo::N32();
56 if (Options.getABIName().startswith("n64"))
57 return MipsABIInfo::N64();
58 assert(Options.getABIName().empty() && "Unknown ABI option for MIPS");
59
60 if (TT.isMIPS64())
61 return MipsABIInfo::N64();
62 return MipsABIInfo::O32();
63 }
64
GetStackPtr() const65 unsigned MipsABIInfo::GetStackPtr() const {
66 return ArePtrs64bit() ? Mips::SP_64 : Mips::SP;
67 }
68
GetFramePtr() const69 unsigned MipsABIInfo::GetFramePtr() const {
70 return ArePtrs64bit() ? Mips::FP_64 : Mips::FP;
71 }
72
GetBasePtr() const73 unsigned MipsABIInfo::GetBasePtr() const {
74 return ArePtrs64bit() ? Mips::S7_64 : Mips::S7;
75 }
76
GetGlobalPtr() const77 unsigned MipsABIInfo::GetGlobalPtr() const {
78 return ArePtrs64bit() ? Mips::GP_64 : Mips::GP;
79 }
80
GetNullPtr() const81 unsigned MipsABIInfo::GetNullPtr() const {
82 return ArePtrs64bit() ? Mips::ZERO_64 : Mips::ZERO;
83 }
84
GetZeroReg() const85 unsigned MipsABIInfo::GetZeroReg() const {
86 return AreGprs64bit() ? Mips::ZERO_64 : Mips::ZERO;
87 }
88
GetPtrAdduOp() const89 unsigned MipsABIInfo::GetPtrAdduOp() const {
90 return ArePtrs64bit() ? Mips::DADDu : Mips::ADDu;
91 }
92
GetPtrAddiuOp() const93 unsigned MipsABIInfo::GetPtrAddiuOp() const {
94 return ArePtrs64bit() ? Mips::DADDiu : Mips::ADDiu;
95 }
96
GetPtrSubuOp() const97 unsigned MipsABIInfo::GetPtrSubuOp() const {
98 return ArePtrs64bit() ? Mips::DSUBu : Mips::SUBu;
99 }
100
GetPtrAndOp() const101 unsigned MipsABIInfo::GetPtrAndOp() const {
102 return ArePtrs64bit() ? Mips::AND64 : Mips::AND;
103 }
104
GetGPRMoveOp() const105 unsigned MipsABIInfo::GetGPRMoveOp() const {
106 return ArePtrs64bit() ? Mips::OR64 : Mips::OR;
107 }
108
GetEhDataReg(unsigned I) const109 unsigned MipsABIInfo::GetEhDataReg(unsigned I) const {
110 static const unsigned EhDataReg[] = {
111 Mips::A0, Mips::A1, Mips::A2, Mips::A3
112 };
113 static const unsigned EhDataReg64[] = {
114 Mips::A0_64, Mips::A1_64, Mips::A2_64, Mips::A3_64
115 };
116
117 return IsN64() ? EhDataReg64[I] : EhDataReg[I];
118 }
119
120