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 const 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 const 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() || IsEABI())
46 return 0;
47 llvm_unreachable("Unhandled ABI");
48 }
49
computeTargetABI(Triple TT,StringRef CPU,const MCTargetOptions & Options)50 MipsABIInfo MipsABIInfo::computeTargetABI(Triple TT, StringRef CPU,
51 const MCTargetOptions &Options) {
52 if (Options.getABIName().startswith("o32"))
53 return MipsABIInfo::O32();
54 else if (Options.getABIName().startswith("n32"))
55 return MipsABIInfo::N32();
56 else if (Options.getABIName().startswith("n64"))
57 return MipsABIInfo::N64();
58 else if (Options.getABIName().startswith("eabi"))
59 return MipsABIInfo::EABI();
60 else if (!Options.getABIName().empty())
61 llvm_unreachable("Unknown ABI option for MIPS");
62
63 // FIXME: This shares code with the selectMipsCPU routine that's
64 // used and not shared in a couple of other places. This needs unifying
65 // at some level.
66 if (CPU.empty() || CPU == "generic") {
67 if (TT.getArch() == Triple::mips || TT.getArch() == Triple::mipsel)
68 CPU = "mips32";
69 else
70 CPU = "mips64";
71 }
72
73 return StringSwitch<MipsABIInfo>(CPU)
74 .Case("mips1", MipsABIInfo::O32())
75 .Case("mips2", MipsABIInfo::O32())
76 .Case("mips32", MipsABIInfo::O32())
77 .Case("mips32r2", MipsABIInfo::O32())
78 .Case("mips32r3", MipsABIInfo::O32())
79 .Case("mips32r5", MipsABIInfo::O32())
80 .Case("mips32r6", MipsABIInfo::O32())
81 .Case("mips16", MipsABIInfo::O32())
82 .Case("mips3", MipsABIInfo::N64())
83 .Case("mips4", MipsABIInfo::N64())
84 .Case("mips5", MipsABIInfo::N64())
85 .Case("mips64", MipsABIInfo::N64())
86 .Case("mips64r2", MipsABIInfo::N64())
87 .Case("mips64r3", MipsABIInfo::N64())
88 .Case("mips64r5", MipsABIInfo::N64())
89 .Case("mips64r6", MipsABIInfo::N64())
90 .Case("octeon", MipsABIInfo::N64())
91 .Default(MipsABIInfo::Unknown());
92 }
93