1//===- ELFTypes.h - Endian specific types for ELF ---------------*- 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#ifndef LLVM_OBJECT_ELFTYPES_H
11#define LLVM_OBJECT_ELFTYPES_H
12
13#include "llvm/ADT/ArrayRef.h"
14#include "llvm/Object/Error.h"
15#include "llvm/Support/ELF.h"
16#include "llvm/Support/Endian.h"
17#include "llvm/Support/ErrorOr.h"
18
19namespace llvm {
20namespace object {
21
22using support::endianness;
23
24template <endianness target_endianness, bool is64Bits> struct ELFType {
25  static const endianness TargetEndianness = target_endianness;
26  static const bool Is64Bits = is64Bits;
27};
28
29typedef ELFType<support::little, false> ELF32LE;
30typedef ELFType<support::big, false> ELF32BE;
31typedef ELFType<support::little, true> ELF64LE;
32typedef ELFType<support::big, true> ELF64BE;
33
34// Use an alignment of 2 for the typedefs since that is the worst case for
35// ELF files in archives.
36
37// Templates to choose Elf_Addr and Elf_Off depending on is64Bits.
38template <endianness target_endianness> struct ELFDataTypeTypedefHelperCommon {
39  typedef support::detail::packed_endian_specific_integral<
40      uint16_t, target_endianness, 2> Elf_Half;
41  typedef support::detail::packed_endian_specific_integral<
42      uint32_t, target_endianness, 2> Elf_Word;
43  typedef support::detail::packed_endian_specific_integral<
44      int32_t, target_endianness, 2> Elf_Sword;
45  typedef support::detail::packed_endian_specific_integral<
46      uint64_t, target_endianness, 2> Elf_Xword;
47  typedef support::detail::packed_endian_specific_integral<
48      int64_t, target_endianness, 2> Elf_Sxword;
49};
50
51template <class ELFT> struct ELFDataTypeTypedefHelper;
52
53/// ELF 32bit types.
54template <endianness TargetEndianness>
55struct ELFDataTypeTypedefHelper<ELFType<TargetEndianness, false>>
56    : ELFDataTypeTypedefHelperCommon<TargetEndianness> {
57  typedef uint32_t value_type;
58  typedef support::detail::packed_endian_specific_integral<
59      value_type, TargetEndianness, 2> Elf_Addr;
60  typedef support::detail::packed_endian_specific_integral<
61      value_type, TargetEndianness, 2> Elf_Off;
62};
63
64/// ELF 64bit types.
65template <endianness TargetEndianness>
66struct ELFDataTypeTypedefHelper<ELFType<TargetEndianness, true>>
67    : ELFDataTypeTypedefHelperCommon<TargetEndianness> {
68  typedef uint64_t value_type;
69  typedef support::detail::packed_endian_specific_integral<
70      value_type, TargetEndianness, 2> Elf_Addr;
71  typedef support::detail::packed_endian_specific_integral<
72      value_type, TargetEndianness, 2> Elf_Off;
73};
74
75// I really don't like doing this, but the alternative is copypasta.
76#define LLVM_ELF_IMPORT_TYPES(E, W)                                            \
77  typedef typename ELFDataTypeTypedefHelper<ELFType<E, W>>::Elf_Addr Elf_Addr; \
78  typedef typename ELFDataTypeTypedefHelper<ELFType<E, W>>::Elf_Off Elf_Off;   \
79  typedef typename ELFDataTypeTypedefHelper<ELFType<E, W>>::Elf_Half Elf_Half; \
80  typedef typename ELFDataTypeTypedefHelper<ELFType<E, W>>::Elf_Word Elf_Word; \
81  typedef                                                                      \
82      typename ELFDataTypeTypedefHelper<ELFType<E, W>>::Elf_Sword Elf_Sword;   \
83  typedef                                                                      \
84      typename ELFDataTypeTypedefHelper<ELFType<E, W>>::Elf_Xword Elf_Xword;   \
85  typedef                                                                      \
86      typename ELFDataTypeTypedefHelper<ELFType<E, W>>::Elf_Sxword Elf_Sxword;
87
88#define LLVM_ELF_IMPORT_TYPES_ELFT(ELFT)                                       \
89  LLVM_ELF_IMPORT_TYPES(ELFT::TargetEndianness, ELFT::Is64Bits)
90
91// Section header.
92template <class ELFT> struct Elf_Shdr_Base;
93
94template <endianness TargetEndianness>
95struct Elf_Shdr_Base<ELFType<TargetEndianness, false>> {
96  LLVM_ELF_IMPORT_TYPES(TargetEndianness, false)
97  Elf_Word sh_name;      // Section name (index into string table)
98  Elf_Word sh_type;      // Section type (SHT_*)
99  Elf_Word sh_flags;     // Section flags (SHF_*)
100  Elf_Addr sh_addr;      // Address where section is to be loaded
101  Elf_Off sh_offset;     // File offset of section data, in bytes
102  Elf_Word sh_size;      // Size of section, in bytes
103  Elf_Word sh_link;      // Section type-specific header table index link
104  Elf_Word sh_info;      // Section type-specific extra information
105  Elf_Word sh_addralign; // Section address alignment
106  Elf_Word sh_entsize;   // Size of records contained within the section
107};
108
109template <endianness TargetEndianness>
110struct Elf_Shdr_Base<ELFType<TargetEndianness, true>> {
111  LLVM_ELF_IMPORT_TYPES(TargetEndianness, true)
112  Elf_Word sh_name;       // Section name (index into string table)
113  Elf_Word sh_type;       // Section type (SHT_*)
114  Elf_Xword sh_flags;     // Section flags (SHF_*)
115  Elf_Addr sh_addr;       // Address where section is to be loaded
116  Elf_Off sh_offset;      // File offset of section data, in bytes
117  Elf_Xword sh_size;      // Size of section, in bytes
118  Elf_Word sh_link;       // Section type-specific header table index link
119  Elf_Word sh_info;       // Section type-specific extra information
120  Elf_Xword sh_addralign; // Section address alignment
121  Elf_Xword sh_entsize;   // Size of records contained within the section
122};
123
124template <class ELFT>
125struct Elf_Shdr_Impl : Elf_Shdr_Base<ELFT> {
126  using Elf_Shdr_Base<ELFT>::sh_entsize;
127  using Elf_Shdr_Base<ELFT>::sh_size;
128
129  /// @brief Get the number of entities this section contains if it has any.
130  unsigned getEntityCount() const {
131    if (sh_entsize == 0)
132      return 0;
133    return sh_size / sh_entsize;
134  }
135};
136
137template <class ELFT> struct Elf_Sym_Base;
138
139template <endianness TargetEndianness>
140struct Elf_Sym_Base<ELFType<TargetEndianness, false>> {
141  LLVM_ELF_IMPORT_TYPES(TargetEndianness, false)
142  Elf_Word st_name;       // Symbol name (index into string table)
143  Elf_Addr st_value;      // Value or address associated with the symbol
144  Elf_Word st_size;       // Size of the symbol
145  unsigned char st_info;  // Symbol's type and binding attributes
146  unsigned char st_other; // Must be zero; reserved
147  Elf_Half st_shndx;      // Which section (header table index) it's defined in
148};
149
150template <endianness TargetEndianness>
151struct Elf_Sym_Base<ELFType<TargetEndianness, true>> {
152  LLVM_ELF_IMPORT_TYPES(TargetEndianness, true)
153  Elf_Word st_name;       // Symbol name (index into string table)
154  unsigned char st_info;  // Symbol's type and binding attributes
155  unsigned char st_other; // Must be zero; reserved
156  Elf_Half st_shndx;      // Which section (header table index) it's defined in
157  Elf_Addr st_value;      // Value or address associated with the symbol
158  Elf_Xword st_size;      // Size of the symbol
159};
160
161template <class ELFT>
162struct Elf_Sym_Impl : Elf_Sym_Base<ELFT> {
163  using Elf_Sym_Base<ELFT>::st_info;
164  using Elf_Sym_Base<ELFT>::st_shndx;
165  using Elf_Sym_Base<ELFT>::st_other;
166  using Elf_Sym_Base<ELFT>::st_value;
167
168  // These accessors and mutators correspond to the ELF32_ST_BIND,
169  // ELF32_ST_TYPE, and ELF32_ST_INFO macros defined in the ELF specification:
170  unsigned char getBinding() const { return st_info >> 4; }
171  unsigned char getType() const { return st_info & 0x0f; }
172  uint64_t getValue() const { return st_value; }
173  void setBinding(unsigned char b) { setBindingAndType(b, getType()); }
174  void setType(unsigned char t) { setBindingAndType(getBinding(), t); }
175  void setBindingAndType(unsigned char b, unsigned char t) {
176    st_info = (b << 4) + (t & 0x0f);
177  }
178
179  /// Access to the STV_xxx flag stored in the first two bits of st_other.
180  /// STV_DEFAULT: 0
181  /// STV_INTERNAL: 1
182  /// STV_HIDDEN: 2
183  /// STV_PROTECTED: 3
184  unsigned char getVisibility() const { return st_other & 0x3; }
185  void setVisibility(unsigned char v) {
186    assert(v < 4 && "Invalid value for visibility");
187    st_other = (st_other & ~0x3) | v;
188  }
189
190  bool isAbsolute() const { return st_shndx == ELF::SHN_ABS; }
191  bool isCommon() const {
192    return getType() == ELF::STT_COMMON || st_shndx == ELF::SHN_COMMON;
193  }
194  bool isDefined() const { return !isUndefined(); }
195  bool isProcessorSpecific() const {
196    return st_shndx >= ELF::SHN_LOPROC && st_shndx <= ELF::SHN_HIPROC;
197  }
198  bool isOSSpecific() const {
199    return st_shndx >= ELF::SHN_LOOS && st_shndx <= ELF::SHN_HIOS;
200  }
201  bool isReserved() const {
202    // ELF::SHN_HIRESERVE is 0xffff so st_shndx <= ELF::SHN_HIRESERVE is always
203    // true and some compilers warn about it.
204    return st_shndx >= ELF::SHN_LORESERVE;
205  }
206  bool isUndefined() const { return st_shndx == ELF::SHN_UNDEF; }
207  bool isExternal() const {
208    return getBinding() != ELF::STB_LOCAL;
209  }
210
211  ErrorOr<StringRef> getName(StringRef StrTab) const;
212};
213
214template <class ELFT>
215ErrorOr<StringRef> Elf_Sym_Impl<ELFT>::getName(StringRef StrTab) const {
216  uint32_t Offset = this->st_name;
217  if (Offset >= StrTab.size())
218    return object_error::parse_failed;
219  return StringRef(StrTab.data() + Offset);
220}
221
222/// Elf_Versym: This is the structure of entries in the SHT_GNU_versym section
223/// (.gnu.version). This structure is identical for ELF32 and ELF64.
224template <class ELFT>
225struct Elf_Versym_Impl {
226  LLVM_ELF_IMPORT_TYPES_ELFT(ELFT)
227  Elf_Half vs_index; // Version index with flags (e.g. VERSYM_HIDDEN)
228};
229
230template <class ELFT> struct Elf_Verdaux_Impl;
231
232/// Elf_Verdef: This is the structure of entries in the SHT_GNU_verdef section
233/// (.gnu.version_d). This structure is identical for ELF32 and ELF64.
234template <class ELFT>
235struct Elf_Verdef_Impl {
236  LLVM_ELF_IMPORT_TYPES_ELFT(ELFT)
237  typedef Elf_Verdaux_Impl<ELFT> Elf_Verdaux;
238  Elf_Half vd_version; // Version of this structure (e.g. VER_DEF_CURRENT)
239  Elf_Half vd_flags;   // Bitwise flags (VER_DEF_*)
240  Elf_Half vd_ndx;     // Version index, used in .gnu.version entries
241  Elf_Half vd_cnt;     // Number of Verdaux entries
242  Elf_Word vd_hash;    // Hash of name
243  Elf_Word vd_aux;     // Offset to the first Verdaux entry (in bytes)
244  Elf_Word vd_next;    // Offset to the next Verdef entry (in bytes)
245
246  /// Get the first Verdaux entry for this Verdef.
247  const Elf_Verdaux *getAux() const {
248    return reinterpret_cast<const Elf_Verdaux *>((const char *)this + vd_aux);
249  }
250};
251
252/// Elf_Verdaux: This is the structure of auxiliary data in the SHT_GNU_verdef
253/// section (.gnu.version_d). This structure is identical for ELF32 and ELF64.
254template <class ELFT>
255struct Elf_Verdaux_Impl {
256  LLVM_ELF_IMPORT_TYPES_ELFT(ELFT)
257  Elf_Word vda_name; // Version name (offset in string table)
258  Elf_Word vda_next; // Offset to next Verdaux entry (in bytes)
259};
260
261/// Elf_Verneed: This is the structure of entries in the SHT_GNU_verneed
262/// section (.gnu.version_r). This structure is identical for ELF32 and ELF64.
263template <class ELFT>
264struct Elf_Verneed_Impl {
265  LLVM_ELF_IMPORT_TYPES_ELFT(ELFT)
266  Elf_Half vn_version; // Version of this structure (e.g. VER_NEED_CURRENT)
267  Elf_Half vn_cnt;     // Number of associated Vernaux entries
268  Elf_Word vn_file;    // Library name (string table offset)
269  Elf_Word vn_aux;     // Offset to first Vernaux entry (in bytes)
270  Elf_Word vn_next;    // Offset to next Verneed entry (in bytes)
271};
272
273/// Elf_Vernaux: This is the structure of auxiliary data in SHT_GNU_verneed
274/// section (.gnu.version_r). This structure is identical for ELF32 and ELF64.
275template <class ELFT>
276struct Elf_Vernaux_Impl {
277  LLVM_ELF_IMPORT_TYPES_ELFT(ELFT)
278  Elf_Word vna_hash;  // Hash of dependency name
279  Elf_Half vna_flags; // Bitwise Flags (VER_FLAG_*)
280  Elf_Half vna_other; // Version index, used in .gnu.version entries
281  Elf_Word vna_name;  // Dependency name
282  Elf_Word vna_next;  // Offset to next Vernaux entry (in bytes)
283};
284
285/// Elf_Dyn_Base: This structure matches the form of entries in the dynamic
286///               table section (.dynamic) look like.
287template <class ELFT> struct Elf_Dyn_Base;
288
289template <endianness TargetEndianness>
290struct Elf_Dyn_Base<ELFType<TargetEndianness, false>> {
291  LLVM_ELF_IMPORT_TYPES(TargetEndianness, false)
292  Elf_Sword d_tag;
293  union {
294    Elf_Word d_val;
295    Elf_Addr d_ptr;
296  } d_un;
297};
298
299template <endianness TargetEndianness>
300struct Elf_Dyn_Base<ELFType<TargetEndianness, true>> {
301  LLVM_ELF_IMPORT_TYPES(TargetEndianness, true)
302  Elf_Sxword d_tag;
303  union {
304    Elf_Xword d_val;
305    Elf_Addr d_ptr;
306  } d_un;
307};
308
309/// Elf_Dyn_Impl: This inherits from Elf_Dyn_Base, adding getters.
310template <class ELFT>
311struct Elf_Dyn_Impl : Elf_Dyn_Base<ELFT> {
312  using Elf_Dyn_Base<ELFT>::d_tag;
313  using Elf_Dyn_Base<ELFT>::d_un;
314  typedef typename std::conditional<ELFT::Is64Bits,
315                                    int64_t, int32_t>::type intX_t;
316  typedef typename std::conditional<ELFT::Is64Bits,
317                                    uint64_t, uint32_t>::type uintX_t;
318  intX_t getTag() const { return d_tag; }
319  uintX_t getVal() const { return d_un.d_val; }
320  uintX_t getPtr() const { return d_un.d_ptr; }
321};
322
323// Elf_Rel: Elf Relocation
324template <class ELFT, bool isRela> struct Elf_Rel_Impl;
325
326template <endianness TargetEndianness>
327struct Elf_Rel_Impl<ELFType<TargetEndianness, false>, false> {
328  LLVM_ELF_IMPORT_TYPES(TargetEndianness, false)
329  Elf_Addr r_offset; // Location (file byte offset, or program virtual addr)
330  Elf_Word r_info;   // Symbol table index and type of relocation to apply
331
332  uint32_t getRInfo(bool isMips64EL) const {
333    assert(!isMips64EL);
334    return r_info;
335  }
336  void setRInfo(uint32_t R, bool IsMips64EL) {
337    assert(!IsMips64EL);
338    r_info = R;
339  }
340
341  // These accessors and mutators correspond to the ELF32_R_SYM, ELF32_R_TYPE,
342  // and ELF32_R_INFO macros defined in the ELF specification:
343  uint32_t getSymbol(bool isMips64EL) const {
344    return this->getRInfo(isMips64EL) >> 8;
345  }
346  unsigned char getType(bool isMips64EL) const {
347    return (unsigned char)(this->getRInfo(isMips64EL) & 0x0ff);
348  }
349  void setSymbol(uint32_t s, bool IsMips64EL) {
350    setSymbolAndType(s, getType(), IsMips64EL);
351  }
352  void setType(unsigned char t, bool IsMips64EL) {
353    setSymbolAndType(getSymbol(), t, IsMips64EL);
354  }
355  void setSymbolAndType(uint32_t s, unsigned char t, bool IsMips64EL) {
356    this->setRInfo((s << 8) + t, IsMips64EL);
357  }
358};
359
360template <endianness TargetEndianness>
361struct Elf_Rel_Impl<ELFType<TargetEndianness, false>, true>
362    : public Elf_Rel_Impl<ELFType<TargetEndianness, false>, false> {
363  LLVM_ELF_IMPORT_TYPES(TargetEndianness, false)
364  Elf_Sword r_addend; // Compute value for relocatable field by adding this
365};
366
367template <endianness TargetEndianness>
368struct Elf_Rel_Impl<ELFType<TargetEndianness, true>, false> {
369  LLVM_ELF_IMPORT_TYPES(TargetEndianness, true)
370  Elf_Addr r_offset; // Location (file byte offset, or program virtual addr)
371  Elf_Xword r_info;  // Symbol table index and type of relocation to apply
372
373  uint64_t getRInfo(bool isMips64EL) const {
374    uint64_t t = r_info;
375    if (!isMips64EL)
376      return t;
377    // Mips64 little endian has a "special" encoding of r_info. Instead of one
378    // 64 bit little endian number, it is a little endian 32 bit number followed
379    // by a 32 bit big endian number.
380    return (t << 32) | ((t >> 8) & 0xff000000) | ((t >> 24) & 0x00ff0000) |
381           ((t >> 40) & 0x0000ff00) | ((t >> 56) & 0x000000ff);
382  }
383  void setRInfo(uint64_t R, bool IsMips64EL) {
384    if (IsMips64EL)
385      r_info = (R >> 32) | ((R & 0xff000000) << 8) | ((R & 0x00ff0000) << 24) |
386               ((R & 0x0000ff00) << 40) | ((R & 0x000000ff) << 56);
387    else
388      r_info = R;
389  }
390
391  // These accessors and mutators correspond to the ELF64_R_SYM, ELF64_R_TYPE,
392  // and ELF64_R_INFO macros defined in the ELF specification:
393  uint32_t getSymbol(bool isMips64EL) const {
394    return (uint32_t)(this->getRInfo(isMips64EL) >> 32);
395  }
396  uint32_t getType(bool isMips64EL) const {
397    return (uint32_t)(this->getRInfo(isMips64EL) & 0xffffffffL);
398  }
399  void setSymbol(uint32_t s, bool IsMips64EL) {
400    setSymbolAndType(s, getType(), IsMips64EL);
401  }
402  void setType(uint32_t t, bool IsMips64EL) {
403    setSymbolAndType(getSymbol(), t, IsMips64EL);
404  }
405  void setSymbolAndType(uint32_t s, uint32_t t, bool IsMips64EL) {
406    this->setRInfo(((uint64_t)s << 32) + (t & 0xffffffffL), IsMips64EL);
407  }
408};
409
410template <endianness TargetEndianness>
411struct Elf_Rel_Impl<ELFType<TargetEndianness, true>, true>
412    : public Elf_Rel_Impl<ELFType<TargetEndianness, true>, false> {
413  LLVM_ELF_IMPORT_TYPES(TargetEndianness, true)
414  Elf_Sxword r_addend; // Compute value for relocatable field by adding this.
415};
416
417template <class ELFT>
418struct Elf_Ehdr_Impl {
419  LLVM_ELF_IMPORT_TYPES_ELFT(ELFT)
420  unsigned char e_ident[ELF::EI_NIDENT]; // ELF Identification bytes
421  Elf_Half e_type;                       // Type of file (see ET_*)
422  Elf_Half e_machine;   // Required architecture for this file (see EM_*)
423  Elf_Word e_version;   // Must be equal to 1
424  Elf_Addr e_entry;     // Address to jump to in order to start program
425  Elf_Off e_phoff;      // Program header table's file offset, in bytes
426  Elf_Off e_shoff;      // Section header table's file offset, in bytes
427  Elf_Word e_flags;     // Processor-specific flags
428  Elf_Half e_ehsize;    // Size of ELF header, in bytes
429  Elf_Half e_phentsize; // Size of an entry in the program header table
430  Elf_Half e_phnum;     // Number of entries in the program header table
431  Elf_Half e_shentsize; // Size of an entry in the section header table
432  Elf_Half e_shnum;     // Number of entries in the section header table
433  Elf_Half e_shstrndx;  // Section header table index of section name
434                        // string table
435  bool checkMagic() const {
436    return (memcmp(e_ident, ELF::ElfMagic, strlen(ELF::ElfMagic))) == 0;
437  }
438  unsigned char getFileClass() const { return e_ident[ELF::EI_CLASS]; }
439  unsigned char getDataEncoding() const { return e_ident[ELF::EI_DATA]; }
440};
441
442template <class ELFT> struct Elf_Phdr_Impl;
443
444template <endianness TargetEndianness>
445struct Elf_Phdr_Impl<ELFType<TargetEndianness, false>> {
446  LLVM_ELF_IMPORT_TYPES(TargetEndianness, false)
447  Elf_Word p_type;   // Type of segment
448  Elf_Off p_offset;  // FileOffset where segment is located, in bytes
449  Elf_Addr p_vaddr;  // Virtual Address of beginning of segment
450  Elf_Addr p_paddr;  // Physical address of beginning of segment (OS-specific)
451  Elf_Word p_filesz; // Num. of bytes in file image of segment (may be zero)
452  Elf_Word p_memsz;  // Num. of bytes in mem image of segment (may be zero)
453  Elf_Word p_flags;  // Segment flags
454  Elf_Word p_align;  // Segment alignment constraint
455};
456
457template <endianness TargetEndianness>
458struct Elf_Phdr_Impl<ELFType<TargetEndianness, true>> {
459  LLVM_ELF_IMPORT_TYPES(TargetEndianness, true)
460  Elf_Word p_type;    // Type of segment
461  Elf_Word p_flags;   // Segment flags
462  Elf_Off p_offset;   // FileOffset where segment is located, in bytes
463  Elf_Addr p_vaddr;   // Virtual Address of beginning of segment
464  Elf_Addr p_paddr;   // Physical address of beginning of segment (OS-specific)
465  Elf_Xword p_filesz; // Num. of bytes in file image of segment (may be zero)
466  Elf_Xword p_memsz;  // Num. of bytes in mem image of segment (may be zero)
467  Elf_Xword p_align;  // Segment alignment constraint
468};
469
470// ELFT needed for endianess.
471template <class ELFT>
472struct Elf_Hash_Impl {
473  LLVM_ELF_IMPORT_TYPES_ELFT(ELFT)
474  Elf_Word nbucket;
475  Elf_Word nchain;
476
477  ArrayRef<Elf_Word> buckets() const {
478    return ArrayRef<Elf_Word>(&nbucket + 2, &nbucket + 2 + nbucket);
479  }
480
481  ArrayRef<Elf_Word> chains() const {
482    return ArrayRef<Elf_Word>(&nbucket + 2 + nbucket,
483                              &nbucket + 2 + nbucket + nchain);
484  }
485};
486
487// .gnu.hash section
488template <class ELFT>
489struct Elf_GnuHash_Impl {
490  LLVM_ELF_IMPORT_TYPES_ELFT(ELFT)
491  Elf_Word nbuckets;
492  Elf_Word symndx;
493  Elf_Word maskwords;
494  Elf_Word shift2;
495
496  ArrayRef<Elf_Off> filter() const {
497    return ArrayRef<Elf_Off>(reinterpret_cast<const Elf_Off *>(&shift2 + 1),
498                             maskwords);
499  }
500
501  ArrayRef<Elf_Word> buckets() const {
502    return ArrayRef<Elf_Word>(
503        reinterpret_cast<const Elf_Word *>(filter().end()), nbuckets);
504  }
505
506  ArrayRef<Elf_Word> values(unsigned DynamicSymCount) const {
507    return ArrayRef<Elf_Word>(buckets().end(), DynamicSymCount - symndx);
508  }
509};
510
511// MIPS .reginfo section
512template <class ELFT>
513struct Elf_Mips_RegInfo;
514
515template <llvm::support::endianness TargetEndianness>
516struct Elf_Mips_RegInfo<ELFType<TargetEndianness, false>> {
517  LLVM_ELF_IMPORT_TYPES(TargetEndianness, false)
518  Elf_Word ri_gprmask;     // bit-mask of used general registers
519  Elf_Word ri_cprmask[4];  // bit-mask of used co-processor registers
520  Elf_Addr ri_gp_value;    // gp register value
521};
522
523template <llvm::support::endianness TargetEndianness>
524struct Elf_Mips_RegInfo<ELFType<TargetEndianness, true>> {
525  LLVM_ELF_IMPORT_TYPES(TargetEndianness, true)
526  Elf_Word ri_gprmask;     // bit-mask of used general registers
527  Elf_Word ri_pad;         // unused padding field
528  Elf_Word ri_cprmask[4];  // bit-mask of used co-processor registers
529  Elf_Addr ri_gp_value;    // gp register value
530};
531
532// .MIPS.options section
533template <class ELFT> struct Elf_Mips_Options {
534  LLVM_ELF_IMPORT_TYPES_ELFT(ELFT)
535  uint8_t kind;     // Determines interpretation of variable part of descriptor
536  uint8_t size;     // Byte size of descriptor, including this header
537  Elf_Half section; // Section header index of section affected,
538                    // or 0 for global options
539  Elf_Word info;    // Kind-specific information
540
541  const Elf_Mips_RegInfo<ELFT> &getRegInfo() const {
542    assert(kind == llvm::ELF::ODK_REGINFO);
543    return *reinterpret_cast<const Elf_Mips_RegInfo<ELFT> *>(
544               (const uint8_t *)this + sizeof(Elf_Mips_Options));
545  }
546};
547
548// .MIPS.abiflags section content
549template <class ELFT> struct Elf_Mips_ABIFlags {
550  LLVM_ELF_IMPORT_TYPES_ELFT(ELFT)
551  Elf_Half version;  // Version of the structure
552  uint8_t isa_level; // ISA level: 1-5, 32, and 64
553  uint8_t isa_rev;   // ISA revision (0 for MIPS I - MIPS V)
554  uint8_t gpr_size;  // General purpose registers size
555  uint8_t cpr1_size; // Co-processor 1 registers size
556  uint8_t cpr2_size; // Co-processor 2 registers size
557  uint8_t fp_abi;    // Floating-point ABI flag
558  Elf_Word isa_ext;  // Processor-specific extension
559  Elf_Word ases;     // ASEs flags
560  Elf_Word flags1;   // General flags
561  Elf_Word flags2;   // General flags
562};
563
564} // end namespace object.
565} // end namespace llvm.
566
567#endif
568