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/MC/MCTargetOptions.h"
13#include "llvm/Support/CommandLine.h"
14
15using namespace llvm;
16
17// Note: this option is defined here to be visible from libLLVMMipsAsmParser
18// and libLLVMMipsCodeGen
19cl::opt<bool>
20EmitJalrReloc("mips-jalr-reloc", cl::Hidden,
21 cl::desc("MIPS: Emit R_{MICRO}MIPS_JALR relocation with jalr"),
22 cl::init(Val: true));
23cl::opt<bool>
24 NoZeroDivCheck("mno-check-zero-division", cl::Hidden,
25 cl::desc("MIPS: Don't trap on integer division by zero."),
26 cl::init(Val: false));
27
28namespace {
29static const MCPhysReg O32IntRegs[4] = {Mips::A0, Mips::A1, Mips::A2, Mips::A3};
30
31static const MCPhysReg Mips64IntRegs[8] = {
32 Mips::A0_64, Mips::A1_64, Mips::A2_64, Mips::A3_64,
33 Mips::T0_64, Mips::T1_64, Mips::T2_64, Mips::T3_64};
34}
35
36ArrayRef<MCPhysReg> MipsABIInfo::GetByValArgRegs() const {
37 if (IsO32())
38 return ArrayRef(O32IntRegs);
39 if (IsN32() || IsN64())
40 return ArrayRef(Mips64IntRegs);
41 llvm_unreachable("Unhandled ABI");
42}
43
44ArrayRef<MCPhysReg> MipsABIInfo::getVarArgRegs(bool isGP64bit) const {
45 if (IsO32()) {
46 if (isGP64bit)
47 return ArrayRef(Mips64IntRegs);
48 else
49 return ArrayRef(O32IntRegs);
50 }
51 if (IsN32() || IsN64())
52 return ArrayRef(Mips64IntRegs);
53 llvm_unreachable("Unhandled ABI");
54}
55
56unsigned MipsABIInfo::GetCalleeAllocdArgSizeInBytes(CallingConv::ID CC) const {
57 if (IsO32())
58 return CC != CallingConv::Fast ? 16 : 0;
59 if (IsN32() || IsN64())
60 return 0;
61 llvm_unreachable("Unhandled ABI");
62}
63
64MipsABIInfo MipsABIInfo::computeTargetABI(const Triple &TT, StringRef ABIName) {
65 if (ABIName.starts_with(Prefix: "o32"))
66 return MipsABIInfo::O32();
67 if (ABIName.starts_with(Prefix: "n32"))
68 return MipsABIInfo::N32();
69 if (ABIName.starts_with(Prefix: "n64"))
70 return MipsABIInfo::N64();
71 if (TT.isABIN32())
72 return MipsABIInfo::N32();
73 assert(ABIName.empty() && "Unknown ABI option for MIPS");
74
75 if (TT.isMIPS64())
76 return MipsABIInfo::N64();
77 return MipsABIInfo::O32();
78}
79
80unsigned MipsABIInfo::GetStackPtr() const {
81 return ArePtrs64bit() ? Mips::SP_64 : Mips::SP;
82}
83
84unsigned MipsABIInfo::GetFramePtr() const {
85 return ArePtrs64bit() ? Mips::FP_64 : Mips::FP;
86}
87
88unsigned MipsABIInfo::GetBasePtr() const {
89 return ArePtrs64bit() ? Mips::S7_64 : Mips::S7;
90}
91
92unsigned MipsABIInfo::GetGlobalPtr() const {
93 return ArePtrs64bit() ? Mips::GP_64 : Mips::GP;
94}
95
96unsigned MipsABIInfo::GetNullPtr() const {
97 return ArePtrs64bit() ? Mips::ZERO_64 : Mips::ZERO;
98}
99
100unsigned MipsABIInfo::GetZeroReg() const {
101 return AreGprs64bit() ? Mips::ZERO_64 : Mips::ZERO;
102}
103
104unsigned MipsABIInfo::GetPtrAdduOp() const {
105 return ArePtrs64bit() ? Mips::DADDu : Mips::ADDu;
106}
107
108unsigned MipsABIInfo::GetPtrAddiuOp() const {
109 return ArePtrs64bit() ? Mips::DADDiu : Mips::ADDiu;
110}
111
112unsigned MipsABIInfo::GetPtrSubuOp() const {
113 return ArePtrs64bit() ? Mips::DSUBu : Mips::SUBu;
114}
115
116unsigned MipsABIInfo::GetPtrAndOp() const {
117 return ArePtrs64bit() ? Mips::AND64 : Mips::AND;
118}
119
120unsigned MipsABIInfo::GetGPRMoveOp() const {
121 return ArePtrs64bit() ? Mips::OR64 : Mips::OR;
122}
123
124unsigned MipsABIInfo::GetEhDataReg(unsigned I) const {
125 static const unsigned EhDataReg[] = {
126 Mips::A0, Mips::A1, Mips::A2, Mips::A3
127 };
128 static const unsigned EhDataReg64[] = {
129 Mips::A0_64, Mips::A1_64, Mips::A2_64, Mips::A3_64
130 };
131
132 return IsN64() ? EhDataReg64[I] : EhDataReg[I];
133}
134