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/ADT/StringSwitch.h"
13#include "llvm/MC/MCTargetOptions.h"
14#include "llvm/Support/CommandLine.h"
15
16using namespace llvm;
17
18// Note: this option is defined here to be visible from libLLVMMipsAsmParser
19//       and libLLVMMipsCodeGen
20cl::opt<bool>
21EmitJalrReloc("mips-jalr-reloc", cl::Hidden,
22              cl::desc("MIPS: Emit R_{MICRO}MIPS_JALR relocation with jalr"),
23              cl::init(true));
24
25namespace {
26static const MCPhysReg O32IntRegs[4] = {Mips::A0, Mips::A1, Mips::A2, Mips::A3};
27
28static 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
33ArrayRef<MCPhysReg> MipsABIInfo::GetByValArgRegs() const {
34  if (IsO32())
35    return makeArrayRef(O32IntRegs);
36  if (IsN32() || IsN64())
37    return makeArrayRef(Mips64IntRegs);
38  llvm_unreachable("Unhandled ABI");
39}
40
41ArrayRef<MCPhysReg> MipsABIInfo::GetVarArgRegs() const {
42  if (IsO32())
43    return makeArrayRef(O32IntRegs);
44  if (IsN32() || IsN64())
45    return makeArrayRef(Mips64IntRegs);
46  llvm_unreachable("Unhandled ABI");
47}
48
49unsigned 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
57MipsABIInfo MipsABIInfo::computeTargetABI(const Triple &TT, StringRef CPU,
58                                          const MCTargetOptions &Options) {
59  if (Options.getABIName().startswith("o32"))
60    return MipsABIInfo::O32();
61  if (Options.getABIName().startswith("n32"))
62    return MipsABIInfo::N32();
63  if (Options.getABIName().startswith("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
74unsigned MipsABIInfo::GetStackPtr() const {
75  return ArePtrs64bit() ? Mips::SP_64 : Mips::SP;
76}
77
78unsigned MipsABIInfo::GetFramePtr() const {
79  return ArePtrs64bit() ? Mips::FP_64 : Mips::FP;
80}
81
82unsigned MipsABIInfo::GetBasePtr() const {
83  return ArePtrs64bit() ? Mips::S7_64 : Mips::S7;
84}
85
86unsigned MipsABIInfo::GetGlobalPtr() const {
87  return ArePtrs64bit() ? Mips::GP_64 : Mips::GP;
88}
89
90unsigned MipsABIInfo::GetNullPtr() const {
91  return ArePtrs64bit() ? Mips::ZERO_64 : Mips::ZERO;
92}
93
94unsigned MipsABIInfo::GetZeroReg() const {
95  return AreGprs64bit() ? Mips::ZERO_64 : Mips::ZERO;
96}
97
98unsigned MipsABIInfo::GetPtrAdduOp() const {
99  return ArePtrs64bit() ? Mips::DADDu : Mips::ADDu;
100}
101
102unsigned MipsABIInfo::GetPtrAddiuOp() const {
103  return ArePtrs64bit() ? Mips::DADDiu : Mips::ADDiu;
104}
105
106unsigned MipsABIInfo::GetPtrSubuOp() const {
107  return ArePtrs64bit() ? Mips::DSUBu : Mips::SUBu;
108}
109
110unsigned MipsABIInfo::GetPtrAndOp() const {
111  return ArePtrs64bit() ? Mips::AND64 : Mips::AND;
112}
113
114unsigned MipsABIInfo::GetGPRMoveOp() const {
115  return ArePtrs64bit() ? Mips::OR64 : Mips::OR;
116}
117
118unsigned 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