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 (!ProgramHeaderOrError)
29     report_fatal_error(
30         errorToErrorCode(ProgramHeaderOrError.takeError()).message());
31   for (const typename ELFO::Elf_Phdr &Phdr : *ProgramHeaderOrError) {
32     switch (Phdr.p_type) {
33     case ELF::PT_DYNAMIC:
34       outs() << " DYNAMIC ";
35       break;
36     case ELF::PT_GNU_EH_FRAME:
37       outs() << "EH_FRAME ";
38       break;
39     case ELF::PT_GNU_STACK:
40       outs() << "   STACK ";
41       break;
42     case ELF::PT_INTERP:
43       outs() << "  INTERP ";
44       break;
45     case ELF::PT_LOAD:
46       outs() << "    LOAD ";
47       break;
48     case ELF::PT_PHDR:
49       outs() << "    PHDR ";
50       break;
51     case ELF::PT_TLS:
52       outs() << "    TLS ";
53       break;
54     default:
55       outs() << " UNKNOWN ";
56     }
57 
58     const char *Fmt = ELFT::Is64Bits ? "0x%016" PRIx64 " " : "0x%08" PRIx64 " ";
59 
60     outs() << "off    " << format(Fmt, (uint64_t)Phdr.p_offset) << "vaddr "
61            << format(Fmt, (uint64_t)Phdr.p_vaddr) << "paddr "
62            << format(Fmt, (uint64_t)Phdr.p_paddr)
63            << format("align 2**%u\n",
64                      countTrailingZeros<uint64_t>(Phdr.p_align))
65            << "         filesz " << format(Fmt, (uint64_t)Phdr.p_filesz)
66            << "memsz " << format(Fmt, (uint64_t)Phdr.p_memsz) << "flags "
67            << ((Phdr.p_flags & ELF::PF_R) ? "r" : "-")
68            << ((Phdr.p_flags & ELF::PF_W) ? "w" : "-")
69            << ((Phdr.p_flags & ELF::PF_X) ? "x" : "-") << "\n";
70   }
71   outs() << "\n";
72 }
73 
74 void llvm::printELFFileHeader(const object::ObjectFile *Obj) {
75   // Little-endian 32-bit
76   if (const ELF32LEObjectFile *ELFObj = dyn_cast<ELF32LEObjectFile>(Obj))
77     printProgramHeaders(ELFObj->getELFFile());
78 
79   // Big-endian 32-bit
80   if (const ELF32BEObjectFile *ELFObj = dyn_cast<ELF32BEObjectFile>(Obj))
81     printProgramHeaders(ELFObj->getELFFile());
82 
83   // Little-endian 64-bit
84   if (const ELF64LEObjectFile *ELFObj = dyn_cast<ELF64LEObjectFile>(Obj))
85     printProgramHeaders(ELFObj->getELFFile());
86 
87   // Big-endian 64-bit
88   if (const ELF64BEObjectFile *ELFObj = dyn_cast<ELF64BEObjectFile>(Obj))
89     printProgramHeaders(ELFObj->getELFFile());
90 }
91