1 //===-- MipsOptionRecord.cpp - Abstraction for storing information --------===//
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 "MipsOptionRecord.h"
11 #include "MipsELFStreamer.h"
12 #include "MipsTargetStreamer.h"
13 #include "llvm/MC/MCSectionELF.h"
14 
15 using namespace llvm;
16 
EmitMipsOptionRecord()17 void MipsRegInfoRecord::EmitMipsOptionRecord() {
18   MCAssembler &MCA = Streamer->getAssembler();
19   MipsTargetStreamer *MTS =
20       static_cast<MipsTargetStreamer *>(Streamer->getTargetStreamer());
21 
22   Streamer->PushSection();
23 
24   // We need to distinguish between N64 and the rest because at the moment
25   // we don't emit .Mips.options for other ELFs other than N64.
26   // Since .reginfo has the same information as .Mips.options (ODK_REGINFO),
27   // we can use the same abstraction (MipsRegInfoRecord class) to handle both.
28   if (MTS->getABI().IsN64()) {
29     // The EntrySize value of 1 seems strange since the records are neither
30     // 1-byte long nor fixed length but it matches the value GAS emits.
31     MCSectionELF *Sec =
32         Context.getELFSection(".MIPS.options", ELF::SHT_MIPS_OPTIONS,
33                               ELF::SHF_ALLOC | ELF::SHF_MIPS_NOSTRIP, 1, "");
34     MCA.registerSection(*Sec);
35     Sec->setAlignment(8);
36     Streamer->SwitchSection(Sec);
37 
38     Streamer->EmitIntValue(ELF::ODK_REGINFO, 1);  // kind
39     Streamer->EmitIntValue(40, 1); // size
40     Streamer->EmitIntValue(0, 2);  // section
41     Streamer->EmitIntValue(0, 4);  // info
42     Streamer->EmitIntValue(ri_gprmask, 4);
43     Streamer->EmitIntValue(0, 4); // pad
44     Streamer->EmitIntValue(ri_cprmask[0], 4);
45     Streamer->EmitIntValue(ri_cprmask[1], 4);
46     Streamer->EmitIntValue(ri_cprmask[2], 4);
47     Streamer->EmitIntValue(ri_cprmask[3], 4);
48     Streamer->EmitIntValue(ri_gp_value, 8);
49   } else {
50     MCSectionELF *Sec = Context.getELFSection(".reginfo", ELF::SHT_MIPS_REGINFO,
51                                               ELF::SHF_ALLOC, 24, "");
52     MCA.registerSection(*Sec);
53     Sec->setAlignment(MTS->getABI().IsN32() ? 8 : 4);
54     Streamer->SwitchSection(Sec);
55 
56     Streamer->EmitIntValue(ri_gprmask, 4);
57     Streamer->EmitIntValue(ri_cprmask[0], 4);
58     Streamer->EmitIntValue(ri_cprmask[1], 4);
59     Streamer->EmitIntValue(ri_cprmask[2], 4);
60     Streamer->EmitIntValue(ri_cprmask[3], 4);
61     assert((ri_gp_value & 0xffffffff) == ri_gp_value);
62     Streamer->EmitIntValue(ri_gp_value, 4);
63   }
64 
65   Streamer->PopSection();
66 }
67 
SetPhysRegUsed(unsigned Reg,const MCRegisterInfo * MCRegInfo)68 void MipsRegInfoRecord::SetPhysRegUsed(unsigned Reg,
69                                        const MCRegisterInfo *MCRegInfo) {
70   unsigned Value = 0;
71 
72   for (MCSubRegIterator SubRegIt(Reg, MCRegInfo, true); SubRegIt.isValid();
73        ++SubRegIt) {
74     unsigned CurrentSubReg = *SubRegIt;
75 
76     unsigned EncVal = MCRegInfo->getEncodingValue(CurrentSubReg);
77     Value |= 1 << EncVal;
78 
79     if (GPR32RegClass->contains(CurrentSubReg) ||
80         GPR64RegClass->contains(CurrentSubReg))
81       ri_gprmask |= Value;
82     else if (COP0RegClass->contains(CurrentSubReg))
83       ri_cprmask[0] |= Value;
84     // MIPS COP1 is the FPU.
85     else if (FGR32RegClass->contains(CurrentSubReg) ||
86              FGR64RegClass->contains(CurrentSubReg) ||
87              AFGR64RegClass->contains(CurrentSubReg) ||
88              MSA128BRegClass->contains(CurrentSubReg))
89       ri_cprmask[1] |= Value;
90     else if (COP2RegClass->contains(CurrentSubReg))
91       ri_cprmask[2] |= Value;
92     else if (COP3RegClass->contains(CurrentSubReg))
93       ri_cprmask[3] |= Value;
94   }
95 }
96