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1 //===- llvm/BinaryFormat/ELF.h - ELF constants and structures ---*- 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 // This header contains common, non-processor-specific data structures and
11 // constants for the ELF file format.
12 //
13 // The details of the ELF32 bits in this file are largely based on the Tool
14 // Interface Standard (TIS) Executable and Linking Format (ELF) Specification
15 // Version 1.2, May 1995. The ELF64 stuff is based on ELF-64 Object File Format
16 // Version 1.5, Draft 2, May 1998 as well as OpenBSD header files.
17 //
18 //===----------------------------------------------------------------------===//
19 
20 #ifndef LLVM_BINARYFORMAT_ELF_H
21 #define LLVM_BINARYFORMAT_ELF_H
22 
23 #include <cstdint>
24 #include <cstring>
25 
26 namespace llvm {
27 namespace ELF {
28 
29 using Elf32_Addr = uint32_t; // Program address
30 using Elf32_Off = uint32_t;  // File offset
31 using Elf32_Half = uint16_t;
32 using Elf32_Word = uint32_t;
33 using Elf32_Sword = int32_t;
34 
35 using Elf64_Addr = uint64_t;
36 using Elf64_Off = uint64_t;
37 using Elf64_Half = uint16_t;
38 using Elf64_Word = uint32_t;
39 using Elf64_Sword = int32_t;
40 using Elf64_Xword = uint64_t;
41 using Elf64_Sxword = int64_t;
42 
43 // Object file magic string.
44 static const char ElfMagic[] = {0x7f, 'E', 'L', 'F', '\0'};
45 
46 // e_ident size and indices.
47 enum {
48   EI_MAG0 = 0,       // File identification index.
49   EI_MAG1 = 1,       // File identification index.
50   EI_MAG2 = 2,       // File identification index.
51   EI_MAG3 = 3,       // File identification index.
52   EI_CLASS = 4,      // File class.
53   EI_DATA = 5,       // Data encoding.
54   EI_VERSION = 6,    // File version.
55   EI_OSABI = 7,      // OS/ABI identification.
56   EI_ABIVERSION = 8, // ABI version.
57   EI_PAD = 9,        // Start of padding bytes.
58   EI_NIDENT = 16     // Number of bytes in e_ident.
59 };
60 
61 struct Elf32_Ehdr {
62   unsigned char e_ident[EI_NIDENT]; // ELF Identification bytes
63   Elf32_Half e_type;                // Type of file (see ET_* below)
64   Elf32_Half e_machine;   // Required architecture for this file (see EM_*)
65   Elf32_Word e_version;   // Must be equal to 1
66   Elf32_Addr e_entry;     // Address to jump to in order to start program
67   Elf32_Off e_phoff;      // Program header table's file offset, in bytes
68   Elf32_Off e_shoff;      // Section header table's file offset, in bytes
69   Elf32_Word e_flags;     // Processor-specific flags
70   Elf32_Half e_ehsize;    // Size of ELF header, in bytes
71   Elf32_Half e_phentsize; // Size of an entry in the program header table
72   Elf32_Half e_phnum;     // Number of entries in the program header table
73   Elf32_Half e_shentsize; // Size of an entry in the section header table
74   Elf32_Half e_shnum;     // Number of entries in the section header table
75   Elf32_Half e_shstrndx;  // Sect hdr table index of sect name string table
76 
checkMagicElf32_Ehdr77   bool checkMagic() const {
78     return (memcmp(e_ident, ElfMagic, strlen(ElfMagic))) == 0;
79   }
80 
getFileClassElf32_Ehdr81   unsigned char getFileClass() const { return e_ident[EI_CLASS]; }
getDataEncodingElf32_Ehdr82   unsigned char getDataEncoding() const { return e_ident[EI_DATA]; }
83 };
84 
85 // 64-bit ELF header. Fields are the same as for ELF32, but with different
86 // types (see above).
87 struct Elf64_Ehdr {
88   unsigned char e_ident[EI_NIDENT];
89   Elf64_Half e_type;
90   Elf64_Half e_machine;
91   Elf64_Word e_version;
92   Elf64_Addr e_entry;
93   Elf64_Off e_phoff;
94   Elf64_Off e_shoff;
95   Elf64_Word e_flags;
96   Elf64_Half e_ehsize;
97   Elf64_Half e_phentsize;
98   Elf64_Half e_phnum;
99   Elf64_Half e_shentsize;
100   Elf64_Half e_shnum;
101   Elf64_Half e_shstrndx;
102 
checkMagicElf64_Ehdr103   bool checkMagic() const {
104     return (memcmp(e_ident, ElfMagic, strlen(ElfMagic))) == 0;
105   }
106 
getFileClassElf64_Ehdr107   unsigned char getFileClass() const { return e_ident[EI_CLASS]; }
getDataEncodingElf64_Ehdr108   unsigned char getDataEncoding() const { return e_ident[EI_DATA]; }
109 };
110 
111 // File types
112 enum {
113   ET_NONE = 0,        // No file type
114   ET_REL = 1,         // Relocatable file
115   ET_EXEC = 2,        // Executable file
116   ET_DYN = 3,         // Shared object file
117   ET_CORE = 4,        // Core file
118   ET_LOPROC = 0xff00, // Beginning of processor-specific codes
119   ET_HIPROC = 0xffff  // Processor-specific
120 };
121 
122 // Versioning
123 enum { EV_NONE = 0, EV_CURRENT = 1 };
124 
125 // Machine architectures
126 // See current registered ELF machine architectures at:
127 //    http://www.uxsglobal.com/developers/gabi/latest/ch4.eheader.html
128 enum {
129   EM_NONE = 0,           // No machine
130   EM_M32 = 1,            // AT&T WE 32100
131   EM_SPARC = 2,          // SPARC
132   EM_386 = 3,            // Intel 386
133   EM_68K = 4,            // Motorola 68000
134   EM_88K = 5,            // Motorola 88000
135   EM_IAMCU = 6,          // Intel MCU
136   EM_860 = 7,            // Intel 80860
137   EM_MIPS = 8,           // MIPS R3000
138   EM_S370 = 9,           // IBM System/370
139   EM_MIPS_RS3_LE = 10,   // MIPS RS3000 Little-endian
140   EM_PARISC = 15,        // Hewlett-Packard PA-RISC
141   EM_VPP500 = 17,        // Fujitsu VPP500
142   EM_SPARC32PLUS = 18,   // Enhanced instruction set SPARC
143   EM_960 = 19,           // Intel 80960
144   EM_PPC = 20,           // PowerPC
145   EM_PPC64 = 21,         // PowerPC64
146   EM_S390 = 22,          // IBM System/390
147   EM_SPU = 23,           // IBM SPU/SPC
148   EM_V800 = 36,          // NEC V800
149   EM_FR20 = 37,          // Fujitsu FR20
150   EM_RH32 = 38,          // TRW RH-32
151   EM_RCE = 39,           // Motorola RCE
152   EM_ARM = 40,           // ARM
153   EM_ALPHA = 41,         // DEC Alpha
154   EM_SH = 42,            // Hitachi SH
155   EM_SPARCV9 = 43,       // SPARC V9
156   EM_TRICORE = 44,       // Siemens TriCore
157   EM_ARC = 45,           // Argonaut RISC Core
158   EM_H8_300 = 46,        // Hitachi H8/300
159   EM_H8_300H = 47,       // Hitachi H8/300H
160   EM_H8S = 48,           // Hitachi H8S
161   EM_H8_500 = 49,        // Hitachi H8/500
162   EM_IA_64 = 50,         // Intel IA-64 processor architecture
163   EM_MIPS_X = 51,        // Stanford MIPS-X
164   EM_COLDFIRE = 52,      // Motorola ColdFire
165   EM_68HC12 = 53,        // Motorola M68HC12
166   EM_MMA = 54,           // Fujitsu MMA Multimedia Accelerator
167   EM_PCP = 55,           // Siemens PCP
168   EM_NCPU = 56,          // Sony nCPU embedded RISC processor
169   EM_NDR1 = 57,          // Denso NDR1 microprocessor
170   EM_STARCORE = 58,      // Motorola Star*Core processor
171   EM_ME16 = 59,          // Toyota ME16 processor
172   EM_ST100 = 60,         // STMicroelectronics ST100 processor
173   EM_TINYJ = 61,         // Advanced Logic Corp. TinyJ embedded processor family
174   EM_X86_64 = 62,        // AMD x86-64 architecture
175   EM_PDSP = 63,          // Sony DSP Processor
176   EM_PDP10 = 64,         // Digital Equipment Corp. PDP-10
177   EM_PDP11 = 65,         // Digital Equipment Corp. PDP-11
178   EM_FX66 = 66,          // Siemens FX66 microcontroller
179   EM_ST9PLUS = 67,       // STMicroelectronics ST9+ 8/16 bit microcontroller
180   EM_ST7 = 68,           // STMicroelectronics ST7 8-bit microcontroller
181   EM_68HC16 = 69,        // Motorola MC68HC16 Microcontroller
182   EM_68HC11 = 70,        // Motorola MC68HC11 Microcontroller
183   EM_68HC08 = 71,        // Motorola MC68HC08 Microcontroller
184   EM_68HC05 = 72,        // Motorola MC68HC05 Microcontroller
185   EM_SVX = 73,           // Silicon Graphics SVx
186   EM_ST19 = 74,          // STMicroelectronics ST19 8-bit microcontroller
187   EM_VAX = 75,           // Digital VAX
188   EM_CRIS = 76,          // Axis Communications 32-bit embedded processor
189   EM_JAVELIN = 77,       // Infineon Technologies 32-bit embedded processor
190   EM_FIREPATH = 78,      // Element 14 64-bit DSP Processor
191   EM_ZSP = 79,           // LSI Logic 16-bit DSP Processor
192   EM_MMIX = 80,          // Donald Knuth's educational 64-bit processor
193   EM_HUANY = 81,         // Harvard University machine-independent object files
194   EM_PRISM = 82,         // SiTera Prism
195   EM_AVR = 83,           // Atmel AVR 8-bit microcontroller
196   EM_FR30 = 84,          // Fujitsu FR30
197   EM_D10V = 85,          // Mitsubishi D10V
198   EM_D30V = 86,          // Mitsubishi D30V
199   EM_V850 = 87,          // NEC v850
200   EM_M32R = 88,          // Mitsubishi M32R
201   EM_MN10300 = 89,       // Matsushita MN10300
202   EM_MN10200 = 90,       // Matsushita MN10200
203   EM_PJ = 91,            // picoJava
204   EM_OPENRISC = 92,      // OpenRISC 32-bit embedded processor
205   EM_ARC_COMPACT = 93,   // ARC International ARCompact processor (old
206                          // spelling/synonym: EM_ARC_A5)
207   EM_XTENSA = 94,        // Tensilica Xtensa Architecture
208   EM_VIDEOCORE = 95,     // Alphamosaic VideoCore processor
209   EM_TMM_GPP = 96,       // Thompson Multimedia General Purpose Processor
210   EM_NS32K = 97,         // National Semiconductor 32000 series
211   EM_TPC = 98,           // Tenor Network TPC processor
212   EM_SNP1K = 99,         // Trebia SNP 1000 processor
213   EM_ST200 = 100,        // STMicroelectronics (www.st.com) ST200
214   EM_IP2K = 101,         // Ubicom IP2xxx microcontroller family
215   EM_MAX = 102,          // MAX Processor
216   EM_CR = 103,           // National Semiconductor CompactRISC microprocessor
217   EM_F2MC16 = 104,       // Fujitsu F2MC16
218   EM_MSP430 = 105,       // Texas Instruments embedded microcontroller msp430
219   EM_BLACKFIN = 106,     // Analog Devices Blackfin (DSP) processor
220   EM_SE_C33 = 107,       // S1C33 Family of Seiko Epson processors
221   EM_SEP = 108,          // Sharp embedded microprocessor
222   EM_ARCA = 109,         // Arca RISC Microprocessor
223   EM_UNICORE = 110,      // Microprocessor series from PKU-Unity Ltd. and MPRC
224                          // of Peking University
225   EM_EXCESS = 111,       // eXcess: 16/32/64-bit configurable embedded CPU
226   EM_DXP = 112,          // Icera Semiconductor Inc. Deep Execution Processor
227   EM_ALTERA_NIOS2 = 113, // Altera Nios II soft-core processor
228   EM_CRX = 114,          // National Semiconductor CompactRISC CRX
229   EM_XGATE = 115,        // Motorola XGATE embedded processor
230   EM_C166 = 116,         // Infineon C16x/XC16x processor
231   EM_M16C = 117,         // Renesas M16C series microprocessors
232   EM_DSPIC30F = 118,     // Microchip Technology dsPIC30F Digital Signal
233                          // Controller
234   EM_CE = 119,           // Freescale Communication Engine RISC core
235   EM_M32C = 120,         // Renesas M32C series microprocessors
236   EM_TSK3000 = 131,      // Altium TSK3000 core
237   EM_RS08 = 132,         // Freescale RS08 embedded processor
238   EM_SHARC = 133,        // Analog Devices SHARC family of 32-bit DSP
239                          // processors
240   EM_ECOG2 = 134,        // Cyan Technology eCOG2 microprocessor
241   EM_SCORE7 = 135,       // Sunplus S+core7 RISC processor
242   EM_DSP24 = 136,        // New Japan Radio (NJR) 24-bit DSP Processor
243   EM_VIDEOCORE3 = 137,   // Broadcom VideoCore III processor
244   EM_LATTICEMICO32 = 138, // RISC processor for Lattice FPGA architecture
245   EM_SE_C17 = 139,        // Seiko Epson C17 family
246   EM_TI_C6000 = 140,      // The Texas Instruments TMS320C6000 DSP family
247   EM_TI_C2000 = 141,      // The Texas Instruments TMS320C2000 DSP family
248   EM_TI_C5500 = 142,      // The Texas Instruments TMS320C55x DSP family
249   EM_MMDSP_PLUS = 160,    // STMicroelectronics 64bit VLIW Data Signal Processor
250   EM_CYPRESS_M8C = 161,   // Cypress M8C microprocessor
251   EM_R32C = 162,          // Renesas R32C series microprocessors
252   EM_TRIMEDIA = 163,      // NXP Semiconductors TriMedia architecture family
253   EM_HEXAGON = 164,       // Qualcomm Hexagon processor
254   EM_8051 = 165,          // Intel 8051 and variants
255   EM_STXP7X = 166,        // STMicroelectronics STxP7x family of configurable
256                           // and extensible RISC processors
257   EM_NDS32 = 167,         // Andes Technology compact code size embedded RISC
258                           // processor family
259   EM_ECOG1 = 168,         // Cyan Technology eCOG1X family
260   EM_ECOG1X = 168,        // Cyan Technology eCOG1X family
261   EM_MAXQ30 = 169,        // Dallas Semiconductor MAXQ30 Core Micro-controllers
262   EM_XIMO16 = 170,        // New Japan Radio (NJR) 16-bit DSP Processor
263   EM_MANIK = 171,         // M2000 Reconfigurable RISC Microprocessor
264   EM_CRAYNV2 = 172,       // Cray Inc. NV2 vector architecture
265   EM_RX = 173,            // Renesas RX family
266   EM_METAG = 174,         // Imagination Technologies META processor
267                           // architecture
268   EM_MCST_ELBRUS = 175,   // MCST Elbrus general purpose hardware architecture
269   EM_ECOG16 = 176,        // Cyan Technology eCOG16 family
270   EM_CR16 = 177,          // National Semiconductor CompactRISC CR16 16-bit
271                           // microprocessor
272   EM_ETPU = 178,          // Freescale Extended Time Processing Unit
273   EM_SLE9X = 179,         // Infineon Technologies SLE9X core
274   EM_L10M = 180,          // Intel L10M
275   EM_K10M = 181,          // Intel K10M
276   EM_AARCH64 = 183,       // ARM AArch64
277   EM_AVR32 = 185,         // Atmel Corporation 32-bit microprocessor family
278   EM_STM8 = 186,          // STMicroeletronics STM8 8-bit microcontroller
279   EM_TILE64 = 187,        // Tilera TILE64 multicore architecture family
280   EM_TILEPRO = 188,       // Tilera TILEPro multicore architecture family
281   EM_CUDA = 190,          // NVIDIA CUDA architecture
282   EM_TILEGX = 191,        // Tilera TILE-Gx multicore architecture family
283   EM_CLOUDSHIELD = 192,   // CloudShield architecture family
284   EM_COREA_1ST = 193,     // KIPO-KAIST Core-A 1st generation processor family
285   EM_COREA_2ND = 194,     // KIPO-KAIST Core-A 2nd generation processor family
286   EM_ARC_COMPACT2 = 195,  // Synopsys ARCompact V2
287   EM_OPEN8 = 196,         // Open8 8-bit RISC soft processor core
288   EM_RL78 = 197,          // Renesas RL78 family
289   EM_VIDEOCORE5 = 198,    // Broadcom VideoCore V processor
290   EM_78KOR = 199,         // Renesas 78KOR family
291   EM_56800EX = 200,       // Freescale 56800EX Digital Signal Controller (DSC)
292   EM_BA1 = 201,           // Beyond BA1 CPU architecture
293   EM_BA2 = 202,           // Beyond BA2 CPU architecture
294   EM_XCORE = 203,         // XMOS xCORE processor family
295   EM_MCHP_PIC = 204,      // Microchip 8-bit PIC(r) family
296   EM_INTEL205 = 205,      // Reserved by Intel
297   EM_INTEL206 = 206,      // Reserved by Intel
298   EM_INTEL207 = 207,      // Reserved by Intel
299   EM_INTEL208 = 208,      // Reserved by Intel
300   EM_INTEL209 = 209,      // Reserved by Intel
301   EM_KM32 = 210,          // KM211 KM32 32-bit processor
302   EM_KMX32 = 211,         // KM211 KMX32 32-bit processor
303   EM_KMX16 = 212,         // KM211 KMX16 16-bit processor
304   EM_KMX8 = 213,          // KM211 KMX8 8-bit processor
305   EM_KVARC = 214,         // KM211 KVARC processor
306   EM_CDP = 215,           // Paneve CDP architecture family
307   EM_COGE = 216,          // Cognitive Smart Memory Processor
308   EM_COOL = 217,          // iCelero CoolEngine
309   EM_NORC = 218,          // Nanoradio Optimized RISC
310   EM_CSR_KALIMBA = 219,   // CSR Kalimba architecture family
311   EM_AMDGPU = 224,        // AMD GPU architecture
312   EM_RISCV = 243,         // RISC-V
313   EM_LANAI = 244,         // Lanai 32-bit processor
314   EM_BPF = 247,           // Linux kernel bpf virtual machine
315 };
316 
317 // Object file classes.
318 enum {
319   ELFCLASSNONE = 0,
320   ELFCLASS32 = 1, // 32-bit object file
321   ELFCLASS64 = 2  // 64-bit object file
322 };
323 
324 // Object file byte orderings.
325 enum {
326   ELFDATANONE = 0, // Invalid data encoding.
327   ELFDATA2LSB = 1, // Little-endian object file
328   ELFDATA2MSB = 2  // Big-endian object file
329 };
330 
331 // OS ABI identification.
332 enum {
333   ELFOSABI_NONE = 0,           // UNIX System V ABI
334   ELFOSABI_HPUX = 1,           // HP-UX operating system
335   ELFOSABI_NETBSD = 2,         // NetBSD
336   ELFOSABI_GNU = 3,            // GNU/Linux
337   ELFOSABI_LINUX = 3,          // Historical alias for ELFOSABI_GNU.
338   ELFOSABI_HURD = 4,           // GNU/Hurd
339   ELFOSABI_SOLARIS = 6,        // Solaris
340   ELFOSABI_AIX = 7,            // AIX
341   ELFOSABI_IRIX = 8,           // IRIX
342   ELFOSABI_FREEBSD = 9,        // FreeBSD
343   ELFOSABI_TRU64 = 10,         // TRU64 UNIX
344   ELFOSABI_MODESTO = 11,       // Novell Modesto
345   ELFOSABI_OPENBSD = 12,       // OpenBSD
346   ELFOSABI_OPENVMS = 13,       // OpenVMS
347   ELFOSABI_NSK = 14,           // Hewlett-Packard Non-Stop Kernel
348   ELFOSABI_AROS = 15,          // AROS
349   ELFOSABI_FENIXOS = 16,       // FenixOS
350   ELFOSABI_CLOUDABI = 17,      // Nuxi CloudABI
351   ELFOSABI_FIRST_ARCH = 64,    // First architecture-specific OS ABI
352   ELFOSABI_AMDGPU_HSA = 64,    // AMD HSA runtime
353   ELFOSABI_AMDGPU_PAL = 65,    // AMD PAL runtime
354   ELFOSABI_AMDGPU_MESA3D = 66, // AMD GCN GPUs (GFX6+) for MESA runtime
355   ELFOSABI_ARM = 97,           // ARM
356   ELFOSABI_C6000_ELFABI = 64,  // Bare-metal TMS320C6000
357   ELFOSABI_C6000_LINUX = 65,   // Linux TMS320C6000
358   ELFOSABI_STANDALONE = 255,   // Standalone (embedded) application
359   ELFOSABI_LAST_ARCH = 255     // Last Architecture-specific OS ABI
360 };
361 
362 #define ELF_RELOC(name, value) name = value,
363 
364 // X86_64 relocations.
365 enum {
366 #include "ELFRelocs/x86_64.def"
367 };
368 
369 // i386 relocations.
370 enum {
371 #include "ELFRelocs/i386.def"
372 };
373 
374 // ELF Relocation types for PPC32
375 enum {
376 #include "ELFRelocs/PowerPC.def"
377 };
378 
379 // Specific e_flags for PPC64
380 enum {
381   // e_flags bits specifying ABI:
382   // 1 for original ABI using function descriptors,
383   // 2 for revised ABI without function descriptors,
384   // 0 for unspecified or not using any features affected by the differences.
385   EF_PPC64_ABI = 3
386 };
387 
388 // Special values for the st_other field in the symbol table entry for PPC64.
389 enum {
390   STO_PPC64_LOCAL_BIT = 5,
391   STO_PPC64_LOCAL_MASK = (7 << STO_PPC64_LOCAL_BIT)
392 };
decodePPC64LocalEntryOffset(unsigned Other)393 static inline int64_t decodePPC64LocalEntryOffset(unsigned Other) {
394   unsigned Val = (Other & STO_PPC64_LOCAL_MASK) >> STO_PPC64_LOCAL_BIT;
395   return ((1 << Val) >> 2) << 2;
396 }
encodePPC64LocalEntryOffset(int64_t Offset)397 static inline unsigned encodePPC64LocalEntryOffset(int64_t Offset) {
398   unsigned Val =
399       (Offset >= 4 * 4 ? (Offset >= 8 * 4 ? (Offset >= 16 * 4 ? 6 : 5) : 4)
400                        : (Offset >= 2 * 4 ? 3 : (Offset >= 1 * 4 ? 2 : 0)));
401   return Val << STO_PPC64_LOCAL_BIT;
402 }
403 
404 // ELF Relocation types for PPC64
405 enum {
406 #include "ELFRelocs/PowerPC64.def"
407 };
408 
409 // ELF Relocation types for AArch64
410 enum {
411 #include "ELFRelocs/AArch64.def"
412 };
413 
414 // ARM Specific e_flags
415 enum : unsigned {
416   EF_ARM_SOFT_FLOAT = 0x00000200U,     // Legacy pre EABI_VER5
417   EF_ARM_ABI_FLOAT_SOFT = 0x00000200U, // EABI_VER5
418   EF_ARM_VFP_FLOAT = 0x00000400U,      // Legacy pre EABI_VER5
419   EF_ARM_ABI_FLOAT_HARD = 0x00000400U, // EABI_VER5
420   EF_ARM_EABI_UNKNOWN = 0x00000000U,
421   EF_ARM_EABI_VER1 = 0x01000000U,
422   EF_ARM_EABI_VER2 = 0x02000000U,
423   EF_ARM_EABI_VER3 = 0x03000000U,
424   EF_ARM_EABI_VER4 = 0x04000000U,
425   EF_ARM_EABI_VER5 = 0x05000000U,
426   EF_ARM_EABIMASK = 0xFF000000U
427 };
428 
429 // ELF Relocation types for ARM
430 enum {
431 #include "ELFRelocs/ARM.def"
432 };
433 
434 // ARC Specific e_flags
435 enum : unsigned {
436   EF_ARC_MACH_MSK = 0x000000ff,
437   EF_ARC_OSABI_MSK = 0x00000f00,
438   E_ARC_MACH_ARC600 = 0x00000002,
439   E_ARC_MACH_ARC601 = 0x00000004,
440   E_ARC_MACH_ARC700 = 0x00000003,
441   EF_ARC_CPU_ARCV2EM = 0x00000005,
442   EF_ARC_CPU_ARCV2HS = 0x00000006,
443   E_ARC_OSABI_ORIG = 0x00000000,
444   E_ARC_OSABI_V2 = 0x00000200,
445   E_ARC_OSABI_V3 = 0x00000300,
446   E_ARC_OSABI_V4 = 0x00000400,
447   EF_ARC_PIC = 0x00000100
448 };
449 
450 // ELF Relocation types for ARC
451 enum {
452 #include "ELFRelocs/ARC.def"
453 };
454 
455 // AVR specific e_flags
456 enum : unsigned {
457   EF_AVR_ARCH_AVR1 = 1,
458   EF_AVR_ARCH_AVR2 = 2,
459   EF_AVR_ARCH_AVR25 = 25,
460   EF_AVR_ARCH_AVR3 = 3,
461   EF_AVR_ARCH_AVR31 = 31,
462   EF_AVR_ARCH_AVR35 = 35,
463   EF_AVR_ARCH_AVR4 = 4,
464   EF_AVR_ARCH_AVR5 = 5,
465   EF_AVR_ARCH_AVR51 = 51,
466   EF_AVR_ARCH_AVR6 = 6,
467   EF_AVR_ARCH_AVRTINY = 100,
468   EF_AVR_ARCH_XMEGA1 = 101,
469   EF_AVR_ARCH_XMEGA2 = 102,
470   EF_AVR_ARCH_XMEGA3 = 103,
471   EF_AVR_ARCH_XMEGA4 = 104,
472   EF_AVR_ARCH_XMEGA5 = 105,
473   EF_AVR_ARCH_XMEGA6 = 106,
474   EF_AVR_ARCH_XMEGA7 = 107
475 };
476 
477 // ELF Relocation types for AVR
478 enum {
479 #include "ELFRelocs/AVR.def"
480 };
481 
482 // Mips Specific e_flags
483 enum : unsigned {
484   EF_MIPS_NOREORDER = 0x00000001, // Don't reorder instructions
485   EF_MIPS_PIC = 0x00000002,       // Position independent code
486   EF_MIPS_CPIC = 0x00000004,      // Call object with Position independent code
487   EF_MIPS_ABI2 = 0x00000020,      // File uses N32 ABI
488   EF_MIPS_32BITMODE = 0x00000100, // Code compiled for a 64-bit machine
489                                   // in 32-bit mode
490   EF_MIPS_FP64 = 0x00000200,      // Code compiled for a 32-bit machine
491                                   // but uses 64-bit FP registers
492   EF_MIPS_NAN2008 = 0x00000400,   // Uses IEE 754-2008 NaN encoding
493 
494   // ABI flags
495   EF_MIPS_ABI_O32 = 0x00001000, // This file follows the first MIPS 32 bit ABI
496   EF_MIPS_ABI_O64 = 0x00002000, // O32 ABI extended for 64-bit architecture.
497   EF_MIPS_ABI_EABI32 = 0x00003000, // EABI in 32 bit mode.
498   EF_MIPS_ABI_EABI64 = 0x00004000, // EABI in 64 bit mode.
499   EF_MIPS_ABI = 0x0000f000,        // Mask for selecting EF_MIPS_ABI_ variant.
500 
501   // MIPS machine variant
502   EF_MIPS_MACH_NONE = 0x00000000,    // A standard MIPS implementation.
503   EF_MIPS_MACH_3900 = 0x00810000,    // Toshiba R3900
504   EF_MIPS_MACH_4010 = 0x00820000,    // LSI R4010
505   EF_MIPS_MACH_4100 = 0x00830000,    // NEC VR4100
506   EF_MIPS_MACH_4650 = 0x00850000,    // MIPS R4650
507   EF_MIPS_MACH_4120 = 0x00870000,    // NEC VR4120
508   EF_MIPS_MACH_4111 = 0x00880000,    // NEC VR4111/VR4181
509   EF_MIPS_MACH_SB1 = 0x008a0000,     // Broadcom SB-1
510   EF_MIPS_MACH_OCTEON = 0x008b0000,  // Cavium Networks Octeon
511   EF_MIPS_MACH_XLR = 0x008c0000,     // RMI Xlr
512   EF_MIPS_MACH_OCTEON2 = 0x008d0000, // Cavium Networks Octeon2
513   EF_MIPS_MACH_OCTEON3 = 0x008e0000, // Cavium Networks Octeon3
514   EF_MIPS_MACH_5400 = 0x00910000,    // NEC VR5400
515   EF_MIPS_MACH_5900 = 0x00920000,    // MIPS R5900
516   EF_MIPS_MACH_5500 = 0x00980000,    // NEC VR5500
517   EF_MIPS_MACH_9000 = 0x00990000,    // Unknown
518   EF_MIPS_MACH_LS2E = 0x00a00000,    // ST Microelectronics Loongson 2E
519   EF_MIPS_MACH_LS2F = 0x00a10000,    // ST Microelectronics Loongson 2F
520   EF_MIPS_MACH_LS3A = 0x00a20000,    // Loongson 3A
521   EF_MIPS_MACH = 0x00ff0000,         // EF_MIPS_MACH_xxx selection mask
522 
523   // ARCH_ASE
524   EF_MIPS_MICROMIPS = 0x02000000,     // microMIPS
525   EF_MIPS_ARCH_ASE_M16 = 0x04000000,  // Has Mips-16 ISA extensions
526   EF_MIPS_ARCH_ASE_MDMX = 0x08000000, // Has MDMX multimedia extensions
527   EF_MIPS_ARCH_ASE = 0x0f000000,      // Mask for EF_MIPS_ARCH_ASE_xxx flags
528 
529   // ARCH
530   EF_MIPS_ARCH_1 = 0x00000000,    // MIPS1 instruction set
531   EF_MIPS_ARCH_2 = 0x10000000,    // MIPS2 instruction set
532   EF_MIPS_ARCH_3 = 0x20000000,    // MIPS3 instruction set
533   EF_MIPS_ARCH_4 = 0x30000000,    // MIPS4 instruction set
534   EF_MIPS_ARCH_5 = 0x40000000,    // MIPS5 instruction set
535   EF_MIPS_ARCH_32 = 0x50000000,   // MIPS32 instruction set per linux not elf.h
536   EF_MIPS_ARCH_64 = 0x60000000,   // MIPS64 instruction set per linux not elf.h
537   EF_MIPS_ARCH_32R2 = 0x70000000, // mips32r2, mips32r3, mips32r5
538   EF_MIPS_ARCH_64R2 = 0x80000000, // mips64r2, mips64r3, mips64r5
539   EF_MIPS_ARCH_32R6 = 0x90000000, // mips32r6
540   EF_MIPS_ARCH_64R6 = 0xa0000000, // mips64r6
541   EF_MIPS_ARCH = 0xf0000000       // Mask for applying EF_MIPS_ARCH_ variant
542 };
543 
544 // ELF Relocation types for Mips
545 enum {
546 #include "ELFRelocs/Mips.def"
547 };
548 
549 // Special values for the st_other field in the symbol table entry for MIPS.
550 enum {
551   STO_MIPS_OPTIONAL = 0x04,  // Symbol whose definition is optional
552   STO_MIPS_PLT = 0x08,       // PLT entry related dynamic table record
553   STO_MIPS_PIC = 0x20,       // PIC func in an object mixes PIC/non-PIC
554   STO_MIPS_MICROMIPS = 0x80, // MIPS Specific ISA for MicroMips
555   STO_MIPS_MIPS16 = 0xf0     // MIPS Specific ISA for Mips16
556 };
557 
558 // .MIPS.options section descriptor kinds
559 enum {
560   ODK_NULL = 0,       // Undefined
561   ODK_REGINFO = 1,    // Register usage information
562   ODK_EXCEPTIONS = 2, // Exception processing options
563   ODK_PAD = 3,        // Section padding options
564   ODK_HWPATCH = 4,    // Hardware patches applied
565   ODK_FILL = 5,       // Linker fill value
566   ODK_TAGS = 6,       // Space for tool identification
567   ODK_HWAND = 7,      // Hardware AND patches applied
568   ODK_HWOR = 8,       // Hardware OR patches applied
569   ODK_GP_GROUP = 9,   // GP group to use for text/data sections
570   ODK_IDENT = 10,     // ID information
571   ODK_PAGESIZE = 11   // Page size information
572 };
573 
574 // Hexagon-specific e_flags
575 enum {
576   // Object processor version flags, bits[11:0]
577   EF_HEXAGON_MACH_V2 = 0x00000001,  // Hexagon V2
578   EF_HEXAGON_MACH_V3 = 0x00000002,  // Hexagon V3
579   EF_HEXAGON_MACH_V4 = 0x00000003,  // Hexagon V4
580   EF_HEXAGON_MACH_V5 = 0x00000004,  // Hexagon V5
581   EF_HEXAGON_MACH_V55 = 0x00000005, // Hexagon V55
582   EF_HEXAGON_MACH_V60 = 0x00000060, // Hexagon V60
583   EF_HEXAGON_MACH_V62 = 0x00000062, // Hexagon V62
584   EF_HEXAGON_MACH_V65 = 0x00000065, // Hexagon V65
585 
586   // Highest ISA version flags
587   EF_HEXAGON_ISA_MACH = 0x00000000, // Same as specified in bits[11:0]
588                                     // of e_flags
589   EF_HEXAGON_ISA_V2 = 0x00000010,   // Hexagon V2 ISA
590   EF_HEXAGON_ISA_V3 = 0x00000020,   // Hexagon V3 ISA
591   EF_HEXAGON_ISA_V4 = 0x00000030,   // Hexagon V4 ISA
592   EF_HEXAGON_ISA_V5 = 0x00000040,   // Hexagon V5 ISA
593   EF_HEXAGON_ISA_V55 = 0x00000050,  // Hexagon V55 ISA
594   EF_HEXAGON_ISA_V60 = 0x00000060,  // Hexagon V60 ISA
595   EF_HEXAGON_ISA_V62 = 0x00000062,  // Hexagon V62 ISA
596   EF_HEXAGON_ISA_V65 = 0x00000065,  // Hexagon V65 ISA
597 };
598 
599 // Hexagon-specific section indexes for common small data
600 enum {
601   SHN_HEXAGON_SCOMMON = 0xff00,   // Other access sizes
602   SHN_HEXAGON_SCOMMON_1 = 0xff01, // Byte-sized access
603   SHN_HEXAGON_SCOMMON_2 = 0xff02, // Half-word-sized access
604   SHN_HEXAGON_SCOMMON_4 = 0xff03, // Word-sized access
605   SHN_HEXAGON_SCOMMON_8 = 0xff04  // Double-word-size access
606 };
607 
608 // ELF Relocation types for Hexagon
609 enum {
610 #include "ELFRelocs/Hexagon.def"
611 };
612 
613 // ELF Relocation type for Lanai.
614 enum {
615 #include "ELFRelocs/Lanai.def"
616 };
617 
618 // RISCV Specific e_flags
619 enum : unsigned {
620   EF_RISCV_RVC = 0x0001,
621   EF_RISCV_FLOAT_ABI = 0x0006,
622   EF_RISCV_FLOAT_ABI_SOFT = 0x0000,
623   EF_RISCV_FLOAT_ABI_SINGLE = 0x0002,
624   EF_RISCV_FLOAT_ABI_DOUBLE = 0x0004,
625   EF_RISCV_FLOAT_ABI_QUAD = 0x0006,
626   EF_RISCV_RVE = 0x0008
627 };
628 
629 // ELF Relocation types for RISC-V
630 enum {
631 #include "ELFRelocs/RISCV.def"
632 };
633 
634 // ELF Relocation types for S390/zSeries
635 enum {
636 #include "ELFRelocs/SystemZ.def"
637 };
638 
639 // ELF Relocation type for Sparc.
640 enum {
641 #include "ELFRelocs/Sparc.def"
642 };
643 
644 // AMDGPU specific e_flags.
645 enum : unsigned {
646   // Processor selection mask for EF_AMDGPU_MACH_* values.
647   EF_AMDGPU_MACH = 0x0ff,
648 
649   // Not specified processor.
650   EF_AMDGPU_MACH_NONE = 0x000,
651 
652   // R600-based processors.
653 
654   // Radeon HD 2000/3000 Series (R600).
655   EF_AMDGPU_MACH_R600_R600 = 0x001,
656   EF_AMDGPU_MACH_R600_R630 = 0x002,
657   EF_AMDGPU_MACH_R600_RS880 = 0x003,
658   EF_AMDGPU_MACH_R600_RV670 = 0x004,
659   // Radeon HD 4000 Series (R700).
660   EF_AMDGPU_MACH_R600_RV710 = 0x005,
661   EF_AMDGPU_MACH_R600_RV730 = 0x006,
662   EF_AMDGPU_MACH_R600_RV770 = 0x007,
663   // Radeon HD 5000 Series (Evergreen).
664   EF_AMDGPU_MACH_R600_CEDAR = 0x008,
665   EF_AMDGPU_MACH_R600_CYPRESS = 0x009,
666   EF_AMDGPU_MACH_R600_JUNIPER = 0x00a,
667   EF_AMDGPU_MACH_R600_REDWOOD = 0x00b,
668   EF_AMDGPU_MACH_R600_SUMO = 0x00c,
669   // Radeon HD 6000 Series (Northern Islands).
670   EF_AMDGPU_MACH_R600_BARTS = 0x00d,
671   EF_AMDGPU_MACH_R600_CAICOS = 0x00e,
672   EF_AMDGPU_MACH_R600_CAYMAN = 0x00f,
673   EF_AMDGPU_MACH_R600_TURKS = 0x010,
674 
675   // Reserved for R600-based processors.
676   EF_AMDGPU_MACH_R600_RESERVED_FIRST = 0x011,
677   EF_AMDGPU_MACH_R600_RESERVED_LAST = 0x01f,
678 
679   // First/last R600-based processors.
680   EF_AMDGPU_MACH_R600_FIRST = EF_AMDGPU_MACH_R600_R600,
681   EF_AMDGPU_MACH_R600_LAST = EF_AMDGPU_MACH_R600_TURKS,
682 
683   // AMDGCN-based processors.
684 
685   // AMDGCN GFX6.
686   EF_AMDGPU_MACH_AMDGCN_GFX600 = 0x020,
687   EF_AMDGPU_MACH_AMDGCN_GFX601 = 0x021,
688   // AMDGCN GFX7.
689   EF_AMDGPU_MACH_AMDGCN_GFX700 = 0x022,
690   EF_AMDGPU_MACH_AMDGCN_GFX701 = 0x023,
691   EF_AMDGPU_MACH_AMDGCN_GFX702 = 0x024,
692   EF_AMDGPU_MACH_AMDGCN_GFX703 = 0x025,
693   EF_AMDGPU_MACH_AMDGCN_GFX704 = 0x026,
694   // AMDGCN GFX8.
695   EF_AMDGPU_MACH_AMDGCN_GFX801 = 0x028,
696   EF_AMDGPU_MACH_AMDGCN_GFX802 = 0x029,
697   EF_AMDGPU_MACH_AMDGCN_GFX803 = 0x02a,
698   EF_AMDGPU_MACH_AMDGCN_GFX810 = 0x02b,
699   // AMDGCN GFX9.
700   EF_AMDGPU_MACH_AMDGCN_GFX900 = 0x02c,
701   EF_AMDGPU_MACH_AMDGCN_GFX902 = 0x02d,
702   EF_AMDGPU_MACH_AMDGCN_GFX904 = 0x02e,
703   EF_AMDGPU_MACH_AMDGCN_GFX906 = 0x02f,
704 
705   // Reserved for AMDGCN-based processors.
706   EF_AMDGPU_MACH_AMDGCN_RESERVED0 = 0x027,
707   EF_AMDGPU_MACH_AMDGCN_RESERVED1 = 0x030,
708 
709   // First/last AMDGCN-based processors.
710   EF_AMDGPU_MACH_AMDGCN_FIRST = EF_AMDGPU_MACH_AMDGCN_GFX600,
711   EF_AMDGPU_MACH_AMDGCN_LAST = EF_AMDGPU_MACH_AMDGCN_GFX906,
712 
713   // Indicates if the xnack target feature is enabled for all code contained in
714   // the object.
715   EF_AMDGPU_XNACK = 0x100,
716 };
717 
718 // ELF Relocation types for AMDGPU
719 enum {
720 #include "ELFRelocs/AMDGPU.def"
721 };
722 
723 // ELF Relocation types for BPF
724 enum {
725 #include "ELFRelocs/BPF.def"
726 };
727 
728 #undef ELF_RELOC
729 
730 // Section header.
731 struct Elf32_Shdr {
732   Elf32_Word sh_name;      // Section name (index into string table)
733   Elf32_Word sh_type;      // Section type (SHT_*)
734   Elf32_Word sh_flags;     // Section flags (SHF_*)
735   Elf32_Addr sh_addr;      // Address where section is to be loaded
736   Elf32_Off sh_offset;     // File offset of section data, in bytes
737   Elf32_Word sh_size;      // Size of section, in bytes
738   Elf32_Word sh_link;      // Section type-specific header table index link
739   Elf32_Word sh_info;      // Section type-specific extra information
740   Elf32_Word sh_addralign; // Section address alignment
741   Elf32_Word sh_entsize;   // Size of records contained within the section
742 };
743 
744 // Section header for ELF64 - same fields as ELF32, different types.
745 struct Elf64_Shdr {
746   Elf64_Word sh_name;
747   Elf64_Word sh_type;
748   Elf64_Xword sh_flags;
749   Elf64_Addr sh_addr;
750   Elf64_Off sh_offset;
751   Elf64_Xword sh_size;
752   Elf64_Word sh_link;
753   Elf64_Word sh_info;
754   Elf64_Xword sh_addralign;
755   Elf64_Xword sh_entsize;
756 };
757 
758 // Special section indices.
759 enum {
760   SHN_UNDEF = 0,          // Undefined, missing, irrelevant, or meaningless
761   SHN_LORESERVE = 0xff00, // Lowest reserved index
762   SHN_LOPROC = 0xff00,    // Lowest processor-specific index
763   SHN_HIPROC = 0xff1f,    // Highest processor-specific index
764   SHN_LOOS = 0xff20,      // Lowest operating system-specific index
765   SHN_HIOS = 0xff3f,      // Highest operating system-specific index
766   SHN_ABS = 0xfff1,       // Symbol has absolute value; does not need relocation
767   SHN_COMMON = 0xfff2,    // FORTRAN COMMON or C external global variables
768   SHN_XINDEX = 0xffff,    // Mark that the index is >= SHN_LORESERVE
769   SHN_HIRESERVE = 0xffff  // Highest reserved index
770 };
771 
772 // Section types.
773 enum : unsigned {
774   SHT_NULL = 0,                         // No associated section (inactive entry).
775   SHT_PROGBITS = 1,                     // Program-defined contents.
776   SHT_SYMTAB = 2,                       // Symbol table.
777   SHT_STRTAB = 3,                       // String table.
778   SHT_RELA = 4,                         // Relocation entries; explicit addends.
779   SHT_HASH = 5,                         // Symbol hash table.
780   SHT_DYNAMIC = 6,                      // Information for dynamic linking.
781   SHT_NOTE = 7,                         // Information about the file.
782   SHT_NOBITS = 8,                       // Data occupies no space in the file.
783   SHT_REL = 9,                          // Relocation entries; no explicit addends.
784   SHT_SHLIB = 10,                       // Reserved.
785   SHT_DYNSYM = 11,                      // Symbol table.
786   SHT_INIT_ARRAY = 14,                  // Pointers to initialization functions.
787   SHT_FINI_ARRAY = 15,                  // Pointers to termination functions.
788   SHT_PREINIT_ARRAY = 16,               // Pointers to pre-init functions.
789   SHT_GROUP = 17,                       // Section group.
790   SHT_SYMTAB_SHNDX = 18,                // Indices for SHN_XINDEX entries.
791   // Experimental support for SHT_RELR sections. For details, see proposal
792   // at https://groups.google.com/forum/#!topic/generic-abi/bX460iggiKg
793   SHT_RELR = 19,                        // Relocation entries; only offsets.
794   SHT_LOOS = 0x60000000,                // Lowest operating system-specific type.
795   // Android packed relocation section types.
796   // https://android.googlesource.com/platform/bionic/+/6f12bfece5dcc01325e0abba56a46b1bcf991c69/tools/relocation_packer/src/elf_file.cc#37
797   SHT_ANDROID_REL = 0x60000001,
798   SHT_ANDROID_RELA = 0x60000002,
799   SHT_LLVM_ODRTAB = 0x6fff4c00,         // LLVM ODR table.
800   SHT_LLVM_LINKER_OPTIONS = 0x6fff4c01, // LLVM Linker Options.
801   SHT_LLVM_CALL_GRAPH_PROFILE = 0x6fff4c02, // LLVM Call Graph Profile.
802   SHT_LLVM_ADDRSIG = 0x6fff4c03,        // List of address-significant symbols
803                                         // for safe ICF.
804   // Android's experimental support for SHT_RELR sections.
805   // https://android.googlesource.com/platform/bionic/+/b7feec74547f84559a1467aca02708ff61346d2a/libc/include/elf.h#512
806   SHT_ANDROID_RELR = 0x6fffff00,        // Relocation entries; only offsets.
807   SHT_GNU_ATTRIBUTES = 0x6ffffff5,      // Object attributes.
808   SHT_GNU_HASH = 0x6ffffff6,            // GNU-style hash table.
809   SHT_GNU_verdef = 0x6ffffffd,          // GNU version definitions.
810   SHT_GNU_verneed = 0x6ffffffe,         // GNU version references.
811   SHT_GNU_versym = 0x6fffffff,          // GNU symbol versions table.
812   SHT_HIOS = 0x6fffffff,                // Highest operating system-specific type.
813   SHT_LOPROC = 0x70000000,              // Lowest processor arch-specific type.
814   // Fixme: All this is duplicated in MCSectionELF. Why??
815   // Exception Index table
816   SHT_ARM_EXIDX = 0x70000001U,
817   // BPABI DLL dynamic linking pre-emption map
818   SHT_ARM_PREEMPTMAP = 0x70000002U,
819   //  Object file compatibility attributes
820   SHT_ARM_ATTRIBUTES = 0x70000003U,
821   SHT_ARM_DEBUGOVERLAY = 0x70000004U,
822   SHT_ARM_OVERLAYSECTION = 0x70000005U,
823   SHT_HEX_ORDERED = 0x70000000,         // Link editor is to sort the entries in
824                                         // this section based on their sizes
825   SHT_X86_64_UNWIND = 0x70000001,       // Unwind information
826 
827   SHT_MIPS_REGINFO = 0x70000006,        // Register usage information
828   SHT_MIPS_OPTIONS = 0x7000000d,        // General options
829   SHT_MIPS_DWARF = 0x7000001e,          // DWARF debugging section.
830   SHT_MIPS_ABIFLAGS = 0x7000002a,       // ABI information.
831 
832   SHT_HIPROC = 0x7fffffff,              // Highest processor arch-specific type.
833   SHT_LOUSER = 0x80000000,              // Lowest type reserved for applications.
834   SHT_HIUSER = 0xffffffff               // Highest type reserved for applications.
835 };
836 
837 // Section flags.
838 enum : unsigned {
839   // Section data should be writable during execution.
840   SHF_WRITE = 0x1,
841 
842   // Section occupies memory during program execution.
843   SHF_ALLOC = 0x2,
844 
845   // Section contains executable machine instructions.
846   SHF_EXECINSTR = 0x4,
847 
848   // The data in this section may be merged.
849   SHF_MERGE = 0x10,
850 
851   // The data in this section is null-terminated strings.
852   SHF_STRINGS = 0x20,
853 
854   // A field in this section holds a section header table index.
855   SHF_INFO_LINK = 0x40U,
856 
857   // Adds special ordering requirements for link editors.
858   SHF_LINK_ORDER = 0x80U,
859 
860   // This section requires special OS-specific processing to avoid incorrect
861   // behavior.
862   SHF_OS_NONCONFORMING = 0x100U,
863 
864   // This section is a member of a section group.
865   SHF_GROUP = 0x200U,
866 
867   // This section holds Thread-Local Storage.
868   SHF_TLS = 0x400U,
869 
870   // Identifies a section containing compressed data.
871   SHF_COMPRESSED = 0x800U,
872 
873   // This section is excluded from the final executable or shared library.
874   SHF_EXCLUDE = 0x80000000U,
875 
876   // Start of target-specific flags.
877 
878   SHF_MASKOS = 0x0ff00000,
879 
880   // Bits indicating processor-specific flags.
881   SHF_MASKPROC = 0xf0000000,
882 
883   /// All sections with the "d" flag are grouped together by the linker to form
884   /// the data section and the dp register is set to the start of the section by
885   /// the boot code.
886   XCORE_SHF_DP_SECTION = 0x10000000,
887 
888   /// All sections with the "c" flag are grouped together by the linker to form
889   /// the constant pool and the cp register is set to the start of the constant
890   /// pool by the boot code.
891   XCORE_SHF_CP_SECTION = 0x20000000,
892 
893   // If an object file section does not have this flag set, then it may not hold
894   // more than 2GB and can be freely referred to in objects using smaller code
895   // models. Otherwise, only objects using larger code models can refer to them.
896   // For example, a medium code model object can refer to data in a section that
897   // sets this flag besides being able to refer to data in a section that does
898   // not set it; likewise, a small code model object can refer only to code in a
899   // section that does not set this flag.
900   SHF_X86_64_LARGE = 0x10000000,
901 
902   // All sections with the GPREL flag are grouped into a global data area
903   // for faster accesses
904   SHF_HEX_GPREL = 0x10000000,
905 
906   // Section contains text/data which may be replicated in other sections.
907   // Linker must retain only one copy.
908   SHF_MIPS_NODUPES = 0x01000000,
909 
910   // Linker must generate implicit hidden weak names.
911   SHF_MIPS_NAMES = 0x02000000,
912 
913   // Section data local to process.
914   SHF_MIPS_LOCAL = 0x04000000,
915 
916   // Do not strip this section.
917   SHF_MIPS_NOSTRIP = 0x08000000,
918 
919   // Section must be part of global data area.
920   SHF_MIPS_GPREL = 0x10000000,
921 
922   // This section should be merged.
923   SHF_MIPS_MERGE = 0x20000000,
924 
925   // Address size to be inferred from section entry size.
926   SHF_MIPS_ADDR = 0x40000000,
927 
928   // Section data is string data by default.
929   SHF_MIPS_STRING = 0x80000000,
930 
931   // Make code section unreadable when in execute-only mode
932   SHF_ARM_PURECODE = 0x20000000
933 };
934 
935 // Section Group Flags
936 enum : unsigned {
937   GRP_COMDAT = 0x1,
938   GRP_MASKOS = 0x0ff00000,
939   GRP_MASKPROC = 0xf0000000
940 };
941 
942 // Symbol table entries for ELF32.
943 struct Elf32_Sym {
944   Elf32_Word st_name;     // Symbol name (index into string table)
945   Elf32_Addr st_value;    // Value or address associated with the symbol
946   Elf32_Word st_size;     // Size of the symbol
947   unsigned char st_info;  // Symbol's type and binding attributes
948   unsigned char st_other; // Must be zero; reserved
949   Elf32_Half st_shndx;    // Which section (header table index) it's defined in
950 
951   // These accessors and mutators correspond to the ELF32_ST_BIND,
952   // ELF32_ST_TYPE, and ELF32_ST_INFO macros defined in the ELF specification:
getBindingElf32_Sym953   unsigned char getBinding() const { return st_info >> 4; }
getTypeElf32_Sym954   unsigned char getType() const { return st_info & 0x0f; }
setBindingElf32_Sym955   void setBinding(unsigned char b) { setBindingAndType(b, getType()); }
setTypeElf32_Sym956   void setType(unsigned char t) { setBindingAndType(getBinding(), t); }
setBindingAndTypeElf32_Sym957   void setBindingAndType(unsigned char b, unsigned char t) {
958     st_info = (b << 4) + (t & 0x0f);
959   }
960 };
961 
962 // Symbol table entries for ELF64.
963 struct Elf64_Sym {
964   Elf64_Word st_name;     // Symbol name (index into string table)
965   unsigned char st_info;  // Symbol's type and binding attributes
966   unsigned char st_other; // Must be zero; reserved
967   Elf64_Half st_shndx;    // Which section (header tbl index) it's defined in
968   Elf64_Addr st_value;    // Value or address associated with the symbol
969   Elf64_Xword st_size;    // Size of the symbol
970 
971   // These accessors and mutators are identical to those defined for ELF32
972   // symbol table entries.
getBindingElf64_Sym973   unsigned char getBinding() const { return st_info >> 4; }
getTypeElf64_Sym974   unsigned char getType() const { return st_info & 0x0f; }
setBindingElf64_Sym975   void setBinding(unsigned char b) { setBindingAndType(b, getType()); }
setTypeElf64_Sym976   void setType(unsigned char t) { setBindingAndType(getBinding(), t); }
setBindingAndTypeElf64_Sym977   void setBindingAndType(unsigned char b, unsigned char t) {
978     st_info = (b << 4) + (t & 0x0f);
979   }
980 };
981 
982 // The size (in bytes) of symbol table entries.
983 enum {
984   SYMENTRY_SIZE32 = 16, // 32-bit symbol entry size
985   SYMENTRY_SIZE64 = 24  // 64-bit symbol entry size.
986 };
987 
988 // Symbol bindings.
989 enum {
990   STB_LOCAL = 0,  // Local symbol, not visible outside obj file containing def
991   STB_GLOBAL = 1, // Global symbol, visible to all object files being combined
992   STB_WEAK = 2,   // Weak symbol, like global but lower-precedence
993   STB_GNU_UNIQUE = 10,
994   STB_LOOS = 10,   // Lowest operating system-specific binding type
995   STB_HIOS = 12,   // Highest operating system-specific binding type
996   STB_LOPROC = 13, // Lowest processor-specific binding type
997   STB_HIPROC = 15  // Highest processor-specific binding type
998 };
999 
1000 // Symbol types.
1001 enum {
1002   STT_NOTYPE = 0,     // Symbol's type is not specified
1003   STT_OBJECT = 1,     // Symbol is a data object (variable, array, etc.)
1004   STT_FUNC = 2,       // Symbol is executable code (function, etc.)
1005   STT_SECTION = 3,    // Symbol refers to a section
1006   STT_FILE = 4,       // Local, absolute symbol that refers to a file
1007   STT_COMMON = 5,     // An uninitialized common block
1008   STT_TLS = 6,        // Thread local data object
1009   STT_GNU_IFUNC = 10, // GNU indirect function
1010   STT_LOOS = 10,      // Lowest operating system-specific symbol type
1011   STT_HIOS = 12,      // Highest operating system-specific symbol type
1012   STT_LOPROC = 13,    // Lowest processor-specific symbol type
1013   STT_HIPROC = 15,    // Highest processor-specific symbol type
1014 
1015   // AMDGPU symbol types
1016   STT_AMDGPU_HSA_KERNEL = 10
1017 };
1018 
1019 enum {
1020   STV_DEFAULT = 0,  // Visibility is specified by binding type
1021   STV_INTERNAL = 1, // Defined by processor supplements
1022   STV_HIDDEN = 2,   // Not visible to other components
1023   STV_PROTECTED = 3 // Visible in other components but not preemptable
1024 };
1025 
1026 // Symbol number.
1027 enum { STN_UNDEF = 0 };
1028 
1029 // Special relocation symbols used in the MIPS64 ELF relocation entries
1030 enum {
1031   RSS_UNDEF = 0, // None
1032   RSS_GP = 1,    // Value of gp
1033   RSS_GP0 = 2,   // Value of gp used to create object being relocated
1034   RSS_LOC = 3    // Address of location being relocated
1035 };
1036 
1037 // Relocation entry, without explicit addend.
1038 struct Elf32_Rel {
1039   Elf32_Addr r_offset; // Location (file byte offset, or program virtual addr)
1040   Elf32_Word r_info;   // Symbol table index and type of relocation to apply
1041 
1042   // These accessors and mutators correspond to the ELF32_R_SYM, ELF32_R_TYPE,
1043   // and ELF32_R_INFO macros defined in the ELF specification:
getSymbolElf32_Rel1044   Elf32_Word getSymbol() const { return (r_info >> 8); }
getTypeElf32_Rel1045   unsigned char getType() const { return (unsigned char)(r_info & 0x0ff); }
setSymbolElf32_Rel1046   void setSymbol(Elf32_Word s) { setSymbolAndType(s, getType()); }
setTypeElf32_Rel1047   void setType(unsigned char t) { setSymbolAndType(getSymbol(), t); }
setSymbolAndTypeElf32_Rel1048   void setSymbolAndType(Elf32_Word s, unsigned char t) {
1049     r_info = (s << 8) + t;
1050   }
1051 };
1052 
1053 // Relocation entry with explicit addend.
1054 struct Elf32_Rela {
1055   Elf32_Addr r_offset;  // Location (file byte offset, or program virtual addr)
1056   Elf32_Word r_info;    // Symbol table index and type of relocation to apply
1057   Elf32_Sword r_addend; // Compute value for relocatable field by adding this
1058 
1059   // These accessors and mutators correspond to the ELF32_R_SYM, ELF32_R_TYPE,
1060   // and ELF32_R_INFO macros defined in the ELF specification:
getSymbolElf32_Rela1061   Elf32_Word getSymbol() const { return (r_info >> 8); }
getTypeElf32_Rela1062   unsigned char getType() const { return (unsigned char)(r_info & 0x0ff); }
setSymbolElf32_Rela1063   void setSymbol(Elf32_Word s) { setSymbolAndType(s, getType()); }
setTypeElf32_Rela1064   void setType(unsigned char t) { setSymbolAndType(getSymbol(), t); }
setSymbolAndTypeElf32_Rela1065   void setSymbolAndType(Elf32_Word s, unsigned char t) {
1066     r_info = (s << 8) + t;
1067   }
1068 };
1069 
1070 // Relocation entry without explicit addend or info (relative relocations only).
1071 typedef Elf32_Word Elf32_Relr; // offset/bitmap for relative relocations
1072 
1073 // Relocation entry, without explicit addend.
1074 struct Elf64_Rel {
1075   Elf64_Addr r_offset; // Location (file byte offset, or program virtual addr).
1076   Elf64_Xword r_info;  // Symbol table index and type of relocation to apply.
1077 
1078   // These accessors and mutators correspond to the ELF64_R_SYM, ELF64_R_TYPE,
1079   // and ELF64_R_INFO macros defined in the ELF specification:
getSymbolElf64_Rel1080   Elf64_Word getSymbol() const { return (r_info >> 32); }
getTypeElf64_Rel1081   Elf64_Word getType() const { return (Elf64_Word)(r_info & 0xffffffffL); }
setSymbolElf64_Rel1082   void setSymbol(Elf64_Word s) { setSymbolAndType(s, getType()); }
setTypeElf64_Rel1083   void setType(Elf64_Word t) { setSymbolAndType(getSymbol(), t); }
setSymbolAndTypeElf64_Rel1084   void setSymbolAndType(Elf64_Word s, Elf64_Word t) {
1085     r_info = ((Elf64_Xword)s << 32) + (t & 0xffffffffL);
1086   }
1087 };
1088 
1089 // Relocation entry with explicit addend.
1090 struct Elf64_Rela {
1091   Elf64_Addr r_offset; // Location (file byte offset, or program virtual addr).
1092   Elf64_Xword r_info;  // Symbol table index and type of relocation to apply.
1093   Elf64_Sxword r_addend; // Compute value for relocatable field by adding this.
1094 
1095   // These accessors and mutators correspond to the ELF64_R_SYM, ELF64_R_TYPE,
1096   // and ELF64_R_INFO macros defined in the ELF specification:
getSymbolElf64_Rela1097   Elf64_Word getSymbol() const { return (r_info >> 32); }
getTypeElf64_Rela1098   Elf64_Word getType() const { return (Elf64_Word)(r_info & 0xffffffffL); }
setSymbolElf64_Rela1099   void setSymbol(Elf64_Word s) { setSymbolAndType(s, getType()); }
setTypeElf64_Rela1100   void setType(Elf64_Word t) { setSymbolAndType(getSymbol(), t); }
setSymbolAndTypeElf64_Rela1101   void setSymbolAndType(Elf64_Word s, Elf64_Word t) {
1102     r_info = ((Elf64_Xword)s << 32) + (t & 0xffffffffL);
1103   }
1104 };
1105 
1106 // Relocation entry without explicit addend or info (relative relocations only).
1107 typedef Elf64_Xword Elf64_Relr; // offset/bitmap for relative relocations
1108 
1109 // Program header for ELF32.
1110 struct Elf32_Phdr {
1111   Elf32_Word p_type;   // Type of segment
1112   Elf32_Off p_offset;  // File offset where segment is located, in bytes
1113   Elf32_Addr p_vaddr;  // Virtual address of beginning of segment
1114   Elf32_Addr p_paddr;  // Physical address of beginning of segment (OS-specific)
1115   Elf32_Word p_filesz; // Num. of bytes in file image of segment (may be zero)
1116   Elf32_Word p_memsz;  // Num. of bytes in mem image of segment (may be zero)
1117   Elf32_Word p_flags;  // Segment flags
1118   Elf32_Word p_align;  // Segment alignment constraint
1119 };
1120 
1121 // Program header for ELF64.
1122 struct Elf64_Phdr {
1123   Elf64_Word p_type;    // Type of segment
1124   Elf64_Word p_flags;   // Segment flags
1125   Elf64_Off p_offset;   // File offset where segment is located, in bytes
1126   Elf64_Addr p_vaddr;   // Virtual address of beginning of segment
1127   Elf64_Addr p_paddr;   // Physical addr of beginning of segment (OS-specific)
1128   Elf64_Xword p_filesz; // Num. of bytes in file image of segment (may be zero)
1129   Elf64_Xword p_memsz;  // Num. of bytes in mem image of segment (may be zero)
1130   Elf64_Xword p_align;  // Segment alignment constraint
1131 };
1132 
1133 // Segment types.
1134 enum {
1135   PT_NULL = 0,            // Unused segment.
1136   PT_LOAD = 1,            // Loadable segment.
1137   PT_DYNAMIC = 2,         // Dynamic linking information.
1138   PT_INTERP = 3,          // Interpreter pathname.
1139   PT_NOTE = 4,            // Auxiliary information.
1140   PT_SHLIB = 5,           // Reserved.
1141   PT_PHDR = 6,            // The program header table itself.
1142   PT_TLS = 7,             // The thread-local storage template.
1143   PT_LOOS = 0x60000000,   // Lowest operating system-specific pt entry type.
1144   PT_HIOS = 0x6fffffff,   // Highest operating system-specific pt entry type.
1145   PT_LOPROC = 0x70000000, // Lowest processor-specific program hdr entry type.
1146   PT_HIPROC = 0x7fffffff, // Highest processor-specific program hdr entry type.
1147 
1148   // x86-64 program header types.
1149   // These all contain stack unwind tables.
1150   PT_GNU_EH_FRAME = 0x6474e550,
1151   PT_SUNW_EH_FRAME = 0x6474e550,
1152   PT_SUNW_UNWIND = 0x6464e550,
1153 
1154   PT_GNU_STACK = 0x6474e551, // Indicates stack executability.
1155   PT_GNU_RELRO = 0x6474e552, // Read-only after relocation.
1156 
1157   PT_OPENBSD_RANDOMIZE = 0x65a3dbe6, // Fill with random data.
1158   PT_OPENBSD_WXNEEDED = 0x65a3dbe7,  // Program does W^X violations.
1159   PT_OPENBSD_BOOTDATA = 0x65a41be6,  // Section for boot arguments.
1160 
1161   // ARM program header types.
1162   PT_ARM_ARCHEXT = 0x70000000, // Platform architecture compatibility info
1163   // These all contain stack unwind tables.
1164   PT_ARM_EXIDX = 0x70000001,
1165   PT_ARM_UNWIND = 0x70000001,
1166 
1167   // MIPS program header types.
1168   PT_MIPS_REGINFO = 0x70000000,  // Register usage information.
1169   PT_MIPS_RTPROC = 0x70000001,   // Runtime procedure table.
1170   PT_MIPS_OPTIONS = 0x70000002,  // Options segment.
1171   PT_MIPS_ABIFLAGS = 0x70000003, // Abiflags segment.
1172 };
1173 
1174 // Segment flag bits.
1175 enum : unsigned {
1176   PF_X = 1,                // Execute
1177   PF_W = 2,                // Write
1178   PF_R = 4,                // Read
1179   PF_MASKOS = 0x0ff00000,  // Bits for operating system-specific semantics.
1180   PF_MASKPROC = 0xf0000000 // Bits for processor-specific semantics.
1181 };
1182 
1183 // Dynamic table entry for ELF32.
1184 struct Elf32_Dyn {
1185   Elf32_Sword d_tag; // Type of dynamic table entry.
1186   union {
1187     Elf32_Word d_val; // Integer value of entry.
1188     Elf32_Addr d_ptr; // Pointer value of entry.
1189   } d_un;
1190 };
1191 
1192 // Dynamic table entry for ELF64.
1193 struct Elf64_Dyn {
1194   Elf64_Sxword d_tag; // Type of dynamic table entry.
1195   union {
1196     Elf64_Xword d_val; // Integer value of entry.
1197     Elf64_Addr d_ptr;  // Pointer value of entry.
1198   } d_un;
1199 };
1200 
1201 // Dynamic table entry tags.
1202 enum {
1203 #define DYNAMIC_TAG(name, value) DT_##name = value,
1204 #include "DynamicTags.def"
1205 #undef DYNAMIC_TAG
1206 };
1207 
1208 // DT_FLAGS values.
1209 enum {
1210   DF_ORIGIN = 0x01,    // The object may reference $ORIGIN.
1211   DF_SYMBOLIC = 0x02,  // Search the shared lib before searching the exe.
1212   DF_TEXTREL = 0x04,   // Relocations may modify a non-writable segment.
1213   DF_BIND_NOW = 0x08,  // Process all relocations on load.
1214   DF_STATIC_TLS = 0x10 // Reject attempts to load dynamically.
1215 };
1216 
1217 // State flags selectable in the `d_un.d_val' element of the DT_FLAGS_1 entry.
1218 enum {
1219   DF_1_NOW = 0x00000001,       // Set RTLD_NOW for this object.
1220   DF_1_GLOBAL = 0x00000002,    // Set RTLD_GLOBAL for this object.
1221   DF_1_GROUP = 0x00000004,     // Set RTLD_GROUP for this object.
1222   DF_1_NODELETE = 0x00000008,  // Set RTLD_NODELETE for this object.
1223   DF_1_LOADFLTR = 0x00000010,  // Trigger filtee loading at runtime.
1224   DF_1_INITFIRST = 0x00000020, // Set RTLD_INITFIRST for this object.
1225   DF_1_NOOPEN = 0x00000040,    // Set RTLD_NOOPEN for this object.
1226   DF_1_ORIGIN = 0x00000080,    // $ORIGIN must be handled.
1227   DF_1_DIRECT = 0x00000100,    // Direct binding enabled.
1228   DF_1_TRANS = 0x00000200,
1229   DF_1_INTERPOSE = 0x00000400,  // Object is used to interpose.
1230   DF_1_NODEFLIB = 0x00000800,   // Ignore default lib search path.
1231   DF_1_NODUMP = 0x00001000,     // Object can't be dldump'ed.
1232   DF_1_CONFALT = 0x00002000,    // Configuration alternative created.
1233   DF_1_ENDFILTEE = 0x00004000,  // Filtee terminates filters search.
1234   DF_1_DISPRELDNE = 0x00008000, // Disp reloc applied at build time.
1235   DF_1_DISPRELPND = 0x00010000, // Disp reloc applied at run-time.
1236   DF_1_NODIRECT = 0x00020000,   // Object has no-direct binding.
1237   DF_1_IGNMULDEF = 0x00040000,
1238   DF_1_NOKSYMS = 0x00080000,
1239   DF_1_NOHDR = 0x00100000,
1240   DF_1_EDITED = 0x00200000, // Object is modified after built.
1241   DF_1_NORELOC = 0x00400000,
1242   DF_1_SYMINTPOSE = 0x00800000, // Object has individual interposers.
1243   DF_1_GLOBAUDIT = 0x01000000,  // Global auditing required.
1244   DF_1_SINGLETON = 0x02000000   // Singleton symbols are used.
1245 };
1246 
1247 // DT_MIPS_FLAGS values.
1248 enum {
1249   RHF_NONE = 0x00000000,                   // No flags.
1250   RHF_QUICKSTART = 0x00000001,             // Uses shortcut pointers.
1251   RHF_NOTPOT = 0x00000002,                 // Hash size is not a power of two.
1252   RHS_NO_LIBRARY_REPLACEMENT = 0x00000004, // Ignore LD_LIBRARY_PATH.
1253   RHF_NO_MOVE = 0x00000008,                // DSO address may not be relocated.
1254   RHF_SGI_ONLY = 0x00000010,               // SGI specific features.
1255   RHF_GUARANTEE_INIT = 0x00000020,         // Guarantee that .init will finish
1256                                            // executing before any non-init
1257                                            // code in DSO is called.
1258   RHF_DELTA_C_PLUS_PLUS = 0x00000040,      // Contains Delta C++ code.
1259   RHF_GUARANTEE_START_INIT = 0x00000080,   // Guarantee that .init will start
1260                                            // executing before any non-init
1261                                            // code in DSO is called.
1262   RHF_PIXIE = 0x00000100,                  // Generated by pixie.
1263   RHF_DEFAULT_DELAY_LOAD = 0x00000200,     // Delay-load DSO by default.
1264   RHF_REQUICKSTART = 0x00000400,           // Object may be requickstarted
1265   RHF_REQUICKSTARTED = 0x00000800,         // Object has been requickstarted
1266   RHF_CORD = 0x00001000,                   // Generated by cord.
1267   RHF_NO_UNRES_UNDEF = 0x00002000,         // Object contains no unresolved
1268                                            // undef symbols.
1269   RHF_RLD_ORDER_SAFE = 0x00004000          // Symbol table is in a safe order.
1270 };
1271 
1272 // ElfXX_VerDef structure version (GNU versioning)
1273 enum { VER_DEF_NONE = 0, VER_DEF_CURRENT = 1 };
1274 
1275 // VerDef Flags (ElfXX_VerDef::vd_flags)
1276 enum { VER_FLG_BASE = 0x1, VER_FLG_WEAK = 0x2, VER_FLG_INFO = 0x4 };
1277 
1278 // Special constants for the version table. (SHT_GNU_versym/.gnu.version)
1279 enum {
1280   VER_NDX_LOCAL = 0,       // Unversioned local symbol
1281   VER_NDX_GLOBAL = 1,      // Unversioned global symbol
1282   VERSYM_VERSION = 0x7fff, // Version Index mask
1283   VERSYM_HIDDEN = 0x8000   // Hidden bit (non-default version)
1284 };
1285 
1286 // ElfXX_VerNeed structure version (GNU versioning)
1287 enum { VER_NEED_NONE = 0, VER_NEED_CURRENT = 1 };
1288 
1289 // SHT_NOTE section types
1290 enum {
1291   NT_FREEBSD_THRMISC = 7,
1292   NT_FREEBSD_PROCSTAT_PROC = 8,
1293   NT_FREEBSD_PROCSTAT_FILES = 9,
1294   NT_FREEBSD_PROCSTAT_VMMAP = 10,
1295   NT_FREEBSD_PROCSTAT_GROUPS = 11,
1296   NT_FREEBSD_PROCSTAT_UMASK = 12,
1297   NT_FREEBSD_PROCSTAT_RLIMIT = 13,
1298   NT_FREEBSD_PROCSTAT_OSREL = 14,
1299   NT_FREEBSD_PROCSTAT_PSSTRINGS = 15,
1300   NT_FREEBSD_PROCSTAT_AUXV = 16,
1301 };
1302 
1303 enum {
1304   NT_GNU_ABI_TAG = 1,
1305   NT_GNU_HWCAP = 2,
1306   NT_GNU_BUILD_ID = 3,
1307   NT_GNU_GOLD_VERSION = 4,
1308   NT_GNU_PROPERTY_TYPE_0 = 5,
1309 };
1310 
1311 // Property types used in GNU_PROPERTY_TYPE_0 notes.
1312 enum : unsigned {
1313   GNU_PROPERTY_STACK_SIZE = 1,
1314   GNU_PROPERTY_NO_COPY_ON_PROTECTED = 2,
1315   GNU_PROPERTY_X86_FEATURE_1_AND = 0xc0000002
1316 };
1317 
1318 // CET properties
1319 enum {
1320   GNU_PROPERTY_X86_FEATURE_1_IBT = 1 << 0,
1321   GNU_PROPERTY_X86_FEATURE_1_SHSTK = 1 << 1
1322 };
1323 
1324 // AMDGPU specific notes.
1325 enum {
1326   // Note types with values between 0 and 9 (inclusive) are reserved.
1327   NT_AMD_AMDGPU_HSA_METADATA = 10,
1328   NT_AMD_AMDGPU_ISA = 11,
1329   NT_AMD_AMDGPU_PAL_METADATA = 12
1330 };
1331 
1332 enum {
1333   GNU_ABI_TAG_LINUX = 0,
1334   GNU_ABI_TAG_HURD = 1,
1335   GNU_ABI_TAG_SOLARIS = 2,
1336   GNU_ABI_TAG_FREEBSD = 3,
1337   GNU_ABI_TAG_NETBSD = 4,
1338   GNU_ABI_TAG_SYLLABLE = 5,
1339   GNU_ABI_TAG_NACL = 6,
1340 };
1341 
1342 // Android packed relocation group flags.
1343 enum {
1344   RELOCATION_GROUPED_BY_INFO_FLAG = 1,
1345   RELOCATION_GROUPED_BY_OFFSET_DELTA_FLAG = 2,
1346   RELOCATION_GROUPED_BY_ADDEND_FLAG = 4,
1347   RELOCATION_GROUP_HAS_ADDEND_FLAG = 8,
1348 };
1349 
1350 // Compressed section header for ELF32.
1351 struct Elf32_Chdr {
1352   Elf32_Word ch_type;
1353   Elf32_Word ch_size;
1354   Elf32_Word ch_addralign;
1355 };
1356 
1357 // Compressed section header for ELF64.
1358 struct Elf64_Chdr {
1359   Elf64_Word ch_type;
1360   Elf64_Word ch_reserved;
1361   Elf64_Xword ch_size;
1362   Elf64_Xword ch_addralign;
1363 };
1364 
1365 // Node header for ELF32.
1366 struct Elf32_Nhdr {
1367   Elf32_Word n_namesz;
1368   Elf32_Word n_descsz;
1369   Elf32_Word n_type;
1370 };
1371 
1372 // Node header for ELF64.
1373 struct Elf64_Nhdr {
1374   Elf64_Word n_namesz;
1375   Elf64_Word n_descsz;
1376   Elf64_Word n_type;
1377 };
1378 
1379 // Legal values for ch_type field of compressed section header.
1380 enum {
1381   ELFCOMPRESS_ZLIB = 1,            // ZLIB/DEFLATE algorithm.
1382   ELFCOMPRESS_LOOS = 0x60000000,   // Start of OS-specific.
1383   ELFCOMPRESS_HIOS = 0x6fffffff,   // End of OS-specific.
1384   ELFCOMPRESS_LOPROC = 0x70000000, // Start of processor-specific.
1385   ELFCOMPRESS_HIPROC = 0x7fffffff  // End of processor-specific.
1386 };
1387 
1388 } // end namespace ELF
1389 } // end namespace llvm
1390 
1391 #endif // LLVM_BINARYFORMAT_ELF_H
1392