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      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 
     18 namespace 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     // TODO: Need to add -mabicalls and -mno-abicalls flags.
     40     // Currently we assume that -mabicalls is the default.
     41     EFlags |= ELF::EF_MIPS_CPIC;
     42 
     43     if (Subtarget.inMips16Mode())
     44       EFlags |= ELF::EF_MIPS_ARCH_ASE_M16;
     45     else
     46       EFlags |= ELF::EF_MIPS_NOREORDER;
     47 
     48     // Architecture
     49     if (Subtarget.hasMips64r2())
     50       EFlags |= ELF::EF_MIPS_ARCH_64R2;
     51     else if (Subtarget.hasMips64())
     52       EFlags |= ELF::EF_MIPS_ARCH_64;
     53     else if (Subtarget.hasMips32r2())
     54       EFlags |= ELF::EF_MIPS_ARCH_32R2;
     55     else
     56       EFlags |= ELF::EF_MIPS_ARCH_32;
     57 
     58     if (Subtarget.inMicroMipsMode())
     59       EFlags |= ELF::EF_MIPS_MICROMIPS;
     60 
     61     // ABI
     62     if (Subtarget.isABI_O32())
     63       EFlags |= ELF::EF_MIPS_ABI_O32;
     64 
     65     // Relocation Model
     66     Reloc::Model RM = Subtarget.getRelocationModel();
     67     if (RM == Reloc::PIC_ || RM == Reloc::Default)
     68       EFlags |= ELF::EF_MIPS_PIC;
     69     else if (RM == Reloc::Static)
     70       ; // Do nothing for Reloc::Static
     71     else
     72       llvm_unreachable("Unsupported relocation model for e_flags");
     73 
     74     MCA.setELFHeaderEFlags(EFlags);
     75   }
     76 
     77   // For llc. Set a symbol's STO flags
     78   void
     79   MipsELFStreamer::emitMipsSTOCG(const MipsSubtarget &Subtarget,
     80                                  MCSymbol *Sym,
     81                                  unsigned Val) {
     82 
     83     if (hasRawTextSupport())
     84       return;
     85 
     86     MCSymbolData &Data = getOrCreateSymbolData(Sym);
     87     // The "other" values are stored in the last 6 bits of the second byte
     88     // The traditional defines for STO values assume the full byte and thus
     89     // the shift to pack it.
     90     MCELF::setOther(Data, Val >> 2);
     91   }
     92 
     93 } // namespace llvm
     94