[llvm-readobj] Print MIPS .reginfo section content

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@239856 91177308-0d34-0410-b5e6-96231b3b80d8

test/tools/llvm-readobj/mips-reginfo.test

@@ -0,0 +1,10 @@
+RUN: llvm-readobj -mips-reginfo %p/Inputs/reginfo.obj.elf-mipsel | FileCheck %s
+
+CHECK:      MIPS RegInfo {
+CHECK-NEXT:   GP: 0x7FEF
+CHECK-NEXT:   General Mask: 0xB00001F6
+CHECK-NEXT:   Co-Proc Mask0: 0x0
+CHECK-NEXT:   Co-Proc Mask1: 0x0
+CHECK-NEXT:   Co-Proc Mask2: 0x0
+CHECK-NEXT:   Co-Proc Mask3: 0x0
+CHECK-NEXT: }

tools/llvm-readobj/ELFDumper.cpp

@@ -58,6 +58,7 @@ public:
   void printAttributes() override;
   void printMipsPLTGOT() override;
   void printMipsABIFlags() override;
+  void printMipsReginfo() override;
 
 private:
   typedef ELFFile<ELFT> ELFO;
@@ -1424,3 +1425,30 @@ template <class ELFT> void ELFDumper<ELFT>::printMipsABIFlags() {
   W.printFlags("Flags 1", Flags->flags1, makeArrayRef(ElfMipsFlags1));
   W.printHex("Flags 2", Flags->flags2);
 }
+
+template <class ELFT> void ELFDumper<ELFT>::printMipsReginfo() {
+  const Elf_Shdr *Shdr = findSectionByName(*Obj, ".reginfo");
+  if (!Shdr) {
+    W.startLine() << "There is no .reginfo section in the file.\n";
+    return;
+  }
+  ErrorOr<ArrayRef<uint8_t>> Sec = Obj->getSectionContents(Shdr);
+  if (!Sec) {
+    W.startLine() << "The .reginfo section is empty.\n";
+    return;
+  }
+  if (Sec->size() != sizeof(Elf_Mips_RegInfo<ELFT>)) {
+    W.startLine() << "The .reginfo section has a wrong size.\n";
+    return;
+  }
+
+  auto *Reginfo = reinterpret_cast<const Elf_Mips_RegInfo<ELFT> *>(Sec->data());
+
+  DictScope GS(W, "MIPS RegInfo");
+  W.printHex("GP", Reginfo->ri_gp_value);
+  W.printHex("General Mask", Reginfo->ri_gprmask);
+  W.printHex("Co-Proc Mask0", Reginfo->ri_cprmask[0]);
+  W.printHex("Co-Proc Mask1", Reginfo->ri_cprmask[1]);
+  W.printHex("Co-Proc Mask2", Reginfo->ri_cprmask[2]);
+  W.printHex("Co-Proc Mask3", Reginfo->ri_cprmask[3]);
+}

tools/llvm-readobj/ObjDumper.h

@@ -43,6 +43,7 @@ public:
   // Only implemented for MIPS ELF at this time.
   virtual void printMipsPLTGOT() { }
   virtual void printMipsABIFlags() { }
+  virtual void printMipsReginfo() { }
 
   // Only implemented for PE/COFF.
   virtual void printCOFFImports() { }

tools/llvm-readobj/llvm-readobj.cpp

@@ -152,6 +152,10 @@ namespace opts {
   cl::opt<bool> MipsABIFlags("mips-abi-flags",
                              cl::desc("Display the MIPS.abiflags section"));
 
+  // -mips-reginfo
+  cl::opt<bool> MipsReginfo("mips-reginfo",
+                            cl::desc("Display the MIPS .reginfo section"));
+
   // -coff-imports
   cl::opt<bool>
   COFFImports("coff-imports", cl::desc("Display the PE/COFF import table"));
@@ -296,6 +300,8 @@ static void dumpObject(const ObjectFile *Obj) {
       Dumper->printMipsPLTGOT();
     if (opts::MipsABIFlags)
       Dumper->printMipsABIFlags();
+    if (opts::MipsReginfo)
+      Dumper->printMipsReginfo();
   }
   if (opts::COFFImports)
     Dumper->printCOFFImports();