MipsELFStreamer.cpp revision ccb3c9c2702f548fd0a7d60a622e6f4fdf0940e7 
1//===-- MipsELFStreamer.cpp - MipsELFStreamer ---------------------------===//
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#include "MCTargetDesc/MipsELFStreamer.h"
10#include "MipsSubtarget.h"
11#include "llvm/MC/MCAssembler.h"
12#include "llvm/MC/MCELF.h"
13#include "llvm/MC/MCELFSymbolFlags.h"
14#include "llvm/MC/MCSymbol.h"
15#include "llvm/Support/ELF.h"
16#include "llvm/Support/ErrorHandling.h"
17
18namespace llvm {
19
20  MCELFStreamer* createMipsELFStreamer(MCContext &Context, MCAsmBackend &TAB,
21                                       raw_ostream &OS, MCCodeEmitter *Emitter,
22                                       bool RelaxAll, bool NoExecStack) {
23    MipsELFStreamer *S = new MipsELFStreamer(Context, TAB, OS, Emitter,
24                                             RelaxAll, NoExecStack);
25    return S;
26  }
27
28  // For llc. Set a group of ELF header flags
29  void
30  MipsELFStreamer::emitELFHeaderFlagsCG(const MipsSubtarget &Subtarget) {
31
32    if (hasRawTextSupport())
33      return;
34
35    // Update e_header flags
36    MCAssembler& MCA = getAssembler();
37    unsigned EFlags = MCA.getELFHeaderEFlags();
38
39    EFlags |= ELF::EF_MIPS_NOREORDER;
40
41    // Architecture
42    if (Subtarget.hasMips64r2())
43      EFlags |= ELF::EF_MIPS_ARCH_64R2;
44    else if (Subtarget.hasMips64())
45      EFlags |= ELF::EF_MIPS_ARCH_64;
46    else if (Subtarget.hasMips32r2())
47      EFlags |= ELF::EF_MIPS_ARCH_32R2;
48    else
49      EFlags |= ELF::EF_MIPS_ARCH_32;
50
51    if (Subtarget.inMicroMipsMode())
52      EFlags |= ELF::EF_MIPS_MICROMIPS;
53
54    // Relocation Model
55    Reloc::Model RM = Subtarget.getRelocationModel();
56    if (RM == Reloc::PIC_ || RM == Reloc::Default)
57      EFlags |= ELF::EF_MIPS_PIC;
58    else if (RM == Reloc::Static)
59      ; // Do nothing for Reloc::Static
60    else
61      llvm_unreachable("Unsupported relocation model for e_flags");
62
63    MCA.setELFHeaderEFlags(EFlags);
64  }
65
66  // For llc. Set a symbol's STO flags
67  void
68  MipsELFStreamer::emitMipsSTOCG(const MipsSubtarget &Subtarget,
69                                 MCSymbol *Sym,
70                                 unsigned Val) {
71
72    if (hasRawTextSupport())
73      return;
74
75    MCSymbolData &Data = getOrCreateSymbolData(Sym);
76    // The "other" values are stored in the last 6 bits of the second byte
77    // The traditional defines for STO values assume the full byte and thus
78    // the shift to pack it.
79    MCELF::setOther(Data, Val >> 2);
80  }
81
82} // namespace llvm
83