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 
17 #include "llvm/Object/ELF.h"
18 #include "llvm/Support/Format.h"
19 #include "llvm/Support/MathExtras.h"
20 #include "llvm/Support/raw_ostream.h"
21 
22 using namespace llvm;
23 using namespace llvm::object;
24 
25 template<endianness target_endianness, std::size_t max_alignment, bool is64Bits>
26 void printProgramHeaders(
27     const ELFObjectFile<target_endianness, max_alignment, is64Bits> *o) {
28   typedef ELFObjectFile<target_endianness, max_alignment, is64Bits> ELFO;
29   outs() << "Program Header:\n";
30   for (typename ELFO::Elf_Phdr_Iter pi = o->begin_program_headers(),
31                                     pe = o->end_program_headers();
32                                     pi != pe; ++pi) {
33     switch (pi->p_type) {
34     case ELF::PT_LOAD:
35       outs() << "    LOAD ";
36       break;
37     case ELF::PT_GNU_STACK:
38       outs() << "   STACK ";
39       break;
40     case ELF::PT_GNU_EH_FRAME:
41       outs() << "EH_FRAME ";
42       break;
43     default:
44       outs() << " UNKNOWN ";
45     }
46 
47     const char *Fmt = is64Bits ? "0x%016" PRIx64 " " : "0x%08" PRIx64 " ";
48 
49     outs() << "off    "
50            << format(Fmt, (uint64_t)pi->p_offset)
51            << "vaddr "
52            << format(Fmt, (uint64_t)pi->p_vaddr)
53            << "paddr "
54            << format(Fmt, (uint64_t)pi->p_paddr)
55            << format("align 2**%u\n", CountTrailingZeros_64(pi->p_align))
56            << "         filesz "
57            << format(Fmt, (uint64_t)pi->p_filesz)
58            << "memsz "
59            << format(Fmt, (uint64_t)pi->p_memsz)
60            << "flags "
61            << ((pi->p_flags & ELF::PF_R) ? "r" : "-")
62            << ((pi->p_flags & ELF::PF_W) ? "w" : "-")
63            << ((pi->p_flags & ELF::PF_X) ? "x" : "-")
64            << "\n";
65   }
66   outs() << "\n";
67 }
68 
69 void llvm::printELFFileHeader(const object::ObjectFile *Obj) {
70   // Little-endian 32-bit
71   if (const ELFObjectFile<support::little, 4, false> *ELFObj =
72           dyn_cast<ELFObjectFile<support::little, 4, false> >(Obj))
73     printProgramHeaders(ELFObj);
74 
75   // Big-endian 32-bit
76   if (const ELFObjectFile<support::big, 4, false> *ELFObj =
77           dyn_cast<ELFObjectFile<support::big, 4, false> >(Obj))
78     printProgramHeaders(ELFObj);
79 
80   // Little-endian 64-bit
81   if (const ELFObjectFile<support::little, 8, true> *ELFObj =
82           dyn_cast<ELFObjectFile<support::little, 8, true> >(Obj))
83     printProgramHeaders(ELFObj);
84 
85   // Big-endian 64-bit
86   if (const ELFObjectFile<support::big, 8, true> *ELFObj =
87           dyn_cast<ELFObjectFile<support::big, 8, true> >(Obj))
88     printProgramHeaders(ELFObj);
89 }
90