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      1 //===-- ELFDump.cpp - ELF-specific dumper -----------------------*- C++ -*-===//
      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 /// \file
     11 /// \brief This file implements the ELF-specific dumper for llvm-objdump.
     12 ///
     13 //===----------------------------------------------------------------------===//
     14 
     15 #include "llvm-objdump.h"
     16 #include "llvm/Object/ELFObjectFile.h"
     17 #include "llvm/Support/Format.h"
     18 #include "llvm/Support/MathExtras.h"
     19 #include "llvm/Support/raw_ostream.h"
     20 
     21 using namespace llvm;
     22 using namespace llvm::object;
     23 
     24 template <class ELFT> void printProgramHeaders(const ELFFile<ELFT> *o) {
     25   typedef ELFFile<ELFT> ELFO;
     26   outs() << "Program Header:\n";
     27   for (const typename ELFO::Elf_Phdr &Phdr : o->program_headers()) {
     28     switch (Phdr.p_type) {
     29     case ELF::PT_LOAD:
     30       outs() << "    LOAD ";
     31       break;
     32     case ELF::PT_GNU_STACK:
     33       outs() << "   STACK ";
     34       break;
     35     case ELF::PT_GNU_EH_FRAME:
     36       outs() << "EH_FRAME ";
     37       break;
     38     case ELF::PT_INTERP:
     39       outs() << "  INTERP ";
     40       break;
     41     case ELF::PT_DYNAMIC:
     42       outs() << " DYNAMIC ";
     43       break;
     44     case ELF::PT_PHDR:
     45       outs() << "    PHDR ";
     46       break;
     47     case ELF::PT_TLS:
     48       outs() << "    TLS ";
     49       break;
     50     default:
     51       outs() << " UNKNOWN ";
     52     }
     53 
     54     const char *Fmt = ELFT::Is64Bits ? "0x%016" PRIx64 " " : "0x%08" PRIx64 " ";
     55 
     56     outs() << "off    " << format(Fmt, (uint64_t)Phdr.p_offset) << "vaddr "
     57            << format(Fmt, (uint64_t)Phdr.p_vaddr) << "paddr "
     58            << format(Fmt, (uint64_t)Phdr.p_paddr)
     59            << format("align 2**%u\n",
     60                      countTrailingZeros<uint64_t>(Phdr.p_align))
     61            << "         filesz " << format(Fmt, (uint64_t)Phdr.p_filesz)
     62            << "memsz " << format(Fmt, (uint64_t)Phdr.p_memsz) << "flags "
     63            << ((Phdr.p_flags & ELF::PF_R) ? "r" : "-")
     64            << ((Phdr.p_flags & ELF::PF_W) ? "w" : "-")
     65            << ((Phdr.p_flags & ELF::PF_X) ? "x" : "-") << "\n";
     66   }
     67   outs() << "\n";
     68 }
     69 
     70 void llvm::printELFFileHeader(const object::ObjectFile *Obj) {
     71   // Little-endian 32-bit
     72   if (const ELF32LEObjectFile *ELFObj = dyn_cast<ELF32LEObjectFile>(Obj))
     73     printProgramHeaders(ELFObj->getELFFile());
     74 
     75   // Big-endian 32-bit
     76   if (const ELF32BEObjectFile *ELFObj = dyn_cast<ELF32BEObjectFile>(Obj))
     77     printProgramHeaders(ELFObj->getELFFile());
     78 
     79   // Little-endian 64-bit
     80   if (const ELF64LEObjectFile *ELFObj = dyn_cast<ELF64LEObjectFile>(Obj))
     81     printProgramHeaders(ELFObj->getELFFile());
     82 
     83   // Big-endian 64-bit
     84   if (const ELF64BEObjectFile *ELFObj = dyn_cast<ELF64BEObjectFile>(Obj))
     85     printProgramHeaders(ELFObj->getELFFile());
     86 }
     87