[SubZero] Generate MIPS.abiflags section

src/IceTargetLoweringMIPS32.cpp

 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
 /// \brief Implements the TargetLoweringMIPS32 class, which consists almost
@@ skipping 4964 matching lines @@
 }
 
 void ConstantUndef::emit(GlobalContext *) const {
   llvm_unreachable("undef value encountered by emitter.");
 }
 */
 
 TargetDataMIPS32::TargetDataMIPS32(GlobalContext *Ctx)
     : TargetDataLowering(Ctx) {}
 
+// Generate .MIPS.abiflags section. This section contains a versioned data
+// structure with essential information required for loader to determine the
+// requirements of the application.
+void TargetDataMIPS32::emitTargetRODataSections() {
+  struct MipsABIFlagsSection Flags;
+  ELFObjectWriter *Writer = Ctx->getObjectWriter();
+  const std::string Name = ".MIPS.abiflags";
+  const llvm::ELF::Elf64_Word ShType = llvm::ELF::SHT_MIPS_ABIFLAGS;
+  const llvm::ELF::Elf64_Xword ShFlags = llvm::ELF::SHF_ALLOC;
+  const llvm::ELF::Elf64_Xword ShAddralign = 8;
+  const llvm::ELF::Elf64_Xword ShEntsize = sizeof(Flags);
+  Writer->writeTargetRODataSection(
+      Name, ShType, ShFlags, ShAddralign, ShEntsize,
+      llvm::StringRef(reinterpret_cast<const char *>(&Flags), sizeof(Flags)));
+}
+
 void TargetDataMIPS32::lowerGlobals(const VariableDeclarationList &Vars,
                                     const std::string &SectionSuffix) {
   const bool IsPIC = getFlags().getUseNonsfi();
   switch (getFlags().getOutFileType()) {
   case FT_Elf: {
     ELFObjectWriter *Writer = Ctx->getObjectWriter();
     Writer->writeDataSection(Vars, llvm::ELF::R_MIPS_32, SectionSuffix, IsPIC);
   } break;
   case FT_Asm:
   case FT_Iasm: {
@@ skipping 351 matching lines @@
   Str << "\t.set\t"
       << "noat\n";
 }
 
 SmallBitVector TargetMIPS32::TypeToRegisterSet[RCMIPS32_NUM];
 SmallBitVector TargetMIPS32::TypeToRegisterSetUnfiltered[RCMIPS32_NUM];
 SmallBitVector TargetMIPS32::RegisterAliases[RegMIPS32::Reg_NUM];
 
 } // end of namespace MIPS32
 } // end of namespace Ice