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   auto ProgramHeaderOrError = o->program_headers();
28   if (std::error_code EC = ProgramHeaderOrError.getError())
29     report_fatal_error(EC.message());
30   for (const typename ELFO::Elf_Phdr &Phdr : *ProgramHeaderOrError) {
31     switch (Phdr.p_type) {
32     case ELF::PT_LOAD:
33       outs() << "    LOAD ";
34       break;
35     case ELF::PT_GNU_STACK:
36       outs() << "   STACK ";
37       break;
38     case ELF::PT_GNU_EH_FRAME:
39       outs() << "EH_FRAME ";
40       break;
41     case ELF::PT_INTERP:
42       outs() << "  INTERP ";
43       break;
44     case ELF::PT_DYNAMIC:
45       outs() << " DYNAMIC ";
46       break;
47     case ELF::PT_PHDR:
48       outs() << "    PHDR ";
49       break;
50     case ELF::PT_TLS:
51       outs() << "    TLS ";
52       break;
53     default:
54       outs() << " UNKNOWN ";
55     }
56 
57     const char *Fmt = ELFT::Is64Bits ? "0x%016" PRIx64 " " : "0x%08" PRIx64 " ";
58 
59     outs() << "off    " << format(Fmt, (uint64_t)Phdr.p_offset) << "vaddr "
60            << format(Fmt, (uint64_t)Phdr.p_vaddr) << "paddr "
61            << format(Fmt, (uint64_t)Phdr.p_paddr)
62            << format("align 2**%u\n",
63                      countTrailingZeros<uint64_t>(Phdr.p_align))
64            << "         filesz " << format(Fmt, (uint64_t)Phdr.p_filesz)
65            << "memsz " << format(Fmt, (uint64_t)Phdr.p_memsz) << "flags "
66            << ((Phdr.p_flags & ELF::PF_R) ? "r" : "-")
67            << ((Phdr.p_flags & ELF::PF_W) ? "w" : "-")
68            << ((Phdr.p_flags & ELF::PF_X) ? "x" : "-") << "\n";
69   }
70   outs() << "\n";
71 }
72 
73 void llvm::printELFFileHeader(const object::ObjectFile *Obj) {
74   // Little-endian 32-bit
75   if (const ELF32LEObjectFile *ELFObj = dyn_cast<ELF32LEObjectFile>(Obj))
76     printProgramHeaders(ELFObj->getELFFile());
77 
78   // Big-endian 32-bit
79   if (const ELF32BEObjectFile *ELFObj = dyn_cast<ELF32BEObjectFile>(Obj))
80     printProgramHeaders(ELFObj->getELFFile());
81 
82   // Little-endian 64-bit
83   if (const ELF64LEObjectFile *ELFObj = dyn_cast<ELF64LEObjectFile>(Obj))
84     printProgramHeaders(ELFObj->getELFFile());
85 
86   // Big-endian 64-bit
87   if (const ELF64BEObjectFile *ELFObj = dyn_cast<ELF64BEObjectFile>(Obj))
88     printProgramHeaders(ELFObj->getELFFile());
89 }
90