1 //===-- llvm/Support/ELF.h - ELF constants and data 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_SUPPORT_ELF_H
21 #define LLVM_SUPPORT_ELF_H
22
23 #include "llvm/Support/Compiler.h"
24 #include "llvm/Support/DataTypes.h"
25 #include <cstring>
26
27 namespace llvm {
28
29 namespace ELF {
30
31 typedef uint32_t Elf32_Addr; // Program address
32 typedef uint32_t Elf32_Off; // File offset
33 typedef uint16_t Elf32_Half;
34 typedef uint32_t Elf32_Word;
35 typedef int32_t Elf32_Sword;
36
37 typedef uint64_t Elf64_Addr;
38 typedef uint64_t Elf64_Off;
39 typedef uint16_t Elf64_Half;
40 typedef uint32_t Elf64_Word;
41 typedef int32_t Elf64_Sword;
42 typedef uint64_t Elf64_Xword;
43 typedef int64_t Elf64_Sxword;
44
45 // Object file magic string.
46 static const char ElfMagic[] = {0x7f, 'E', 'L', 'F', '\0'};
47
48 // e_ident size and indices.
49 enum {
50 EI_MAG0 = 0, // File identification index.
51 EI_MAG1 = 1, // File identification index.
52 EI_MAG2 = 2, // File identification index.
53 EI_MAG3 = 3, // File identification index.
54 EI_CLASS = 4, // File class.
55 EI_DATA = 5, // Data encoding.
56 EI_VERSION = 6, // File version.
57 EI_OSABI = 7, // OS/ABI identification.
58 EI_ABIVERSION = 8, // ABI version.
59 EI_PAD = 9, // Start of padding bytes.
60 EI_NIDENT = 16 // Number of bytes in e_ident.
61 };
62
63 struct Elf32_Ehdr {
64 unsigned char e_ident[EI_NIDENT]; // ELF Identification bytes
65 Elf32_Half e_type; // Type of file (see ET_* below)
66 Elf32_Half e_machine; // Required architecture for this file (see EM_*)
67 Elf32_Word e_version; // Must be equal to 1
68 Elf32_Addr e_entry; // Address to jump to in order to start program
69 Elf32_Off e_phoff; // Program header table's file offset, in bytes
70 Elf32_Off e_shoff; // Section header table's file offset, in bytes
71 Elf32_Word e_flags; // Processor-specific flags
72 Elf32_Half e_ehsize; // Size of ELF header, in bytes
73 Elf32_Half e_phentsize; // Size of an entry in the program header table
74 Elf32_Half e_phnum; // Number of entries in the program header table
75 Elf32_Half e_shentsize; // Size of an entry in the section header table
76 Elf32_Half e_shnum; // Number of entries in the section header table
77 Elf32_Half e_shstrndx; // Sect hdr table index of sect name string table
checkMagicElf32_Ehdr78 bool checkMagic() const {
79 return (memcmp(e_ident, ElfMagic, strlen(ElfMagic))) == 0;
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;
checkMagicElf64_Ehdr102 bool checkMagic() const {
103 return (memcmp(e_ident, ElfMagic, strlen(ElfMagic))) == 0;
104 }
getFileClassElf64_Ehdr105 unsigned char getFileClass() const { return e_ident[EI_CLASS]; }
getDataEncodingElf64_Ehdr106 unsigned char getDataEncoding() const { return e_ident[EI_DATA]; }
107 };
108
109 // File types
110 enum {
111 ET_NONE = 0, // No file type
112 ET_REL = 1, // Relocatable file
113 ET_EXEC = 2, // Executable file
114 ET_DYN = 3, // Shared object file
115 ET_CORE = 4, // Core file
116 ET_LOPROC = 0xff00, // Beginning of processor-specific codes
117 ET_HIPROC = 0xffff // Processor-specific
118 };
119
120 // Versioning
121 enum { EV_NONE = 0, EV_CURRENT = 1 };
122
123 // Machine architectures
124 // See current registered ELF machine architectures at:
125 // http://www.uxsglobal.com/developers/gabi/latest/ch4.eheader.html
126 enum {
127 EM_NONE = 0, // No machine
128 EM_M32 = 1, // AT&T WE 32100
129 EM_SPARC = 2, // SPARC
130 EM_386 = 3, // Intel 386
131 EM_68K = 4, // Motorola 68000
132 EM_88K = 5, // Motorola 88000
133 EM_IAMCU = 6, // Intel MCU
134 EM_860 = 7, // Intel 80860
135 EM_MIPS = 8, // MIPS R3000
136 EM_S370 = 9, // IBM System/370
137 EM_MIPS_RS3_LE = 10, // MIPS RS3000 Little-endian
138 EM_PARISC = 15, // Hewlett-Packard PA-RISC
139 EM_VPP500 = 17, // Fujitsu VPP500
140 EM_SPARC32PLUS = 18, // Enhanced instruction set SPARC
141 EM_960 = 19, // Intel 80960
142 EM_PPC = 20, // PowerPC
143 EM_PPC64 = 21, // PowerPC64
144 EM_S390 = 22, // IBM System/390
145 EM_SPU = 23, // IBM SPU/SPC
146 EM_V800 = 36, // NEC V800
147 EM_FR20 = 37, // Fujitsu FR20
148 EM_RH32 = 38, // TRW RH-32
149 EM_RCE = 39, // Motorola RCE
150 EM_ARM = 40, // ARM
151 EM_ALPHA = 41, // DEC Alpha
152 EM_SH = 42, // Hitachi SH
153 EM_SPARCV9 = 43, // SPARC V9
154 EM_TRICORE = 44, // Siemens TriCore
155 EM_ARC = 45, // Argonaut RISC Core
156 EM_H8_300 = 46, // Hitachi H8/300
157 EM_H8_300H = 47, // Hitachi H8/300H
158 EM_H8S = 48, // Hitachi H8S
159 EM_H8_500 = 49, // Hitachi H8/500
160 EM_IA_64 = 50, // Intel IA-64 processor architecture
161 EM_MIPS_X = 51, // Stanford MIPS-X
162 EM_COLDFIRE = 52, // Motorola ColdFire
163 EM_68HC12 = 53, // Motorola M68HC12
164 EM_MMA = 54, // Fujitsu MMA Multimedia Accelerator
165 EM_PCP = 55, // Siemens PCP
166 EM_NCPU = 56, // Sony nCPU embedded RISC processor
167 EM_NDR1 = 57, // Denso NDR1 microprocessor
168 EM_STARCORE = 58, // Motorola Star*Core processor
169 EM_ME16 = 59, // Toyota ME16 processor
170 EM_ST100 = 60, // STMicroelectronics ST100 processor
171 EM_TINYJ = 61, // Advanced Logic Corp. TinyJ embedded processor family
172 EM_X86_64 = 62, // AMD x86-64 architecture
173 EM_PDSP = 63, // Sony DSP Processor
174 EM_PDP10 = 64, // Digital Equipment Corp. PDP-10
175 EM_PDP11 = 65, // Digital Equipment Corp. PDP-11
176 EM_FX66 = 66, // Siemens FX66 microcontroller
177 EM_ST9PLUS = 67, // STMicroelectronics ST9+ 8/16 bit microcontroller
178 EM_ST7 = 68, // STMicroelectronics ST7 8-bit microcontroller
179 EM_68HC16 = 69, // Motorola MC68HC16 Microcontroller
180 EM_68HC11 = 70, // Motorola MC68HC11 Microcontroller
181 EM_68HC08 = 71, // Motorola MC68HC08 Microcontroller
182 EM_68HC05 = 72, // Motorola MC68HC05 Microcontroller
183 EM_SVX = 73, // Silicon Graphics SVx
184 EM_ST19 = 74, // STMicroelectronics ST19 8-bit microcontroller
185 EM_VAX = 75, // Digital VAX
186 EM_CRIS = 76, // Axis Communications 32-bit embedded processor
187 EM_JAVELIN = 77, // Infineon Technologies 32-bit embedded processor
188 EM_FIREPATH = 78, // Element 14 64-bit DSP Processor
189 EM_ZSP = 79, // LSI Logic 16-bit DSP Processor
190 EM_MMIX = 80, // Donald Knuth's educational 64-bit processor
191 EM_HUANY = 81, // Harvard University machine-independent object files
192 EM_PRISM = 82, // SiTera Prism
193 EM_AVR = 83, // Atmel AVR 8-bit microcontroller
194 EM_FR30 = 84, // Fujitsu FR30
195 EM_D10V = 85, // Mitsubishi D10V
196 EM_D30V = 86, // Mitsubishi D30V
197 EM_V850 = 87, // NEC v850
198 EM_M32R = 88, // Mitsubishi M32R
199 EM_MN10300 = 89, // Matsushita MN10300
200 EM_MN10200 = 90, // Matsushita MN10200
201 EM_PJ = 91, // picoJava
202 EM_OPENRISC = 92, // OpenRISC 32-bit embedded processor
203 EM_ARC_COMPACT = 93, // ARC International ARCompact processor (old
204 // spelling/synonym: EM_ARC_A5)
205 EM_XTENSA = 94, // Tensilica Xtensa Architecture
206 EM_VIDEOCORE = 95, // Alphamosaic VideoCore processor
207 EM_TMM_GPP = 96, // Thompson Multimedia General Purpose Processor
208 EM_NS32K = 97, // National Semiconductor 32000 series
209 EM_TPC = 98, // Tenor Network TPC processor
210 EM_SNP1K = 99, // Trebia SNP 1000 processor
211 EM_ST200 = 100, // STMicroelectronics (www.st.com) ST200
212 EM_IP2K = 101, // Ubicom IP2xxx microcontroller family
213 EM_MAX = 102, // MAX Processor
214 EM_CR = 103, // National Semiconductor CompactRISC microprocessor
215 EM_F2MC16 = 104, // Fujitsu F2MC16
216 EM_MSP430 = 105, // Texas Instruments embedded microcontroller msp430
217 EM_BLACKFIN = 106, // Analog Devices Blackfin (DSP) processor
218 EM_SE_C33 = 107, // S1C33 Family of Seiko Epson processors
219 EM_SEP = 108, // Sharp embedded microprocessor
220 EM_ARCA = 109, // Arca RISC Microprocessor
221 EM_UNICORE = 110, // Microprocessor series from PKU-Unity Ltd. and MPRC
222 // of Peking University
223 EM_EXCESS = 111, // eXcess: 16/32/64-bit configurable embedded CPU
224 EM_DXP = 112, // Icera Semiconductor Inc. Deep Execution Processor
225 EM_ALTERA_NIOS2 = 113, // Altera Nios II soft-core processor
226 EM_CRX = 114, // National Semiconductor CompactRISC CRX
227 EM_XGATE = 115, // Motorola XGATE embedded processor
228 EM_C166 = 116, // Infineon C16x/XC16x processor
229 EM_M16C = 117, // Renesas M16C series microprocessors
230 EM_DSPIC30F = 118, // Microchip Technology dsPIC30F Digital Signal
231 // Controller
232 EM_CE = 119, // Freescale Communication Engine RISC core
233 EM_M32C = 120, // Renesas M32C series microprocessors
234 EM_TSK3000 = 131, // Altium TSK3000 core
235 EM_RS08 = 132, // Freescale RS08 embedded processor
236 EM_SHARC = 133, // Analog Devices SHARC family of 32-bit DSP
237 // processors
238 EM_ECOG2 = 134, // Cyan Technology eCOG2 microprocessor
239 EM_SCORE7 = 135, // Sunplus S+core7 RISC processor
240 EM_DSP24 = 136, // New Japan Radio (NJR) 24-bit DSP Processor
241 EM_VIDEOCORE3 = 137, // Broadcom VideoCore III processor
242 EM_LATTICEMICO32 = 138, // RISC processor for Lattice FPGA architecture
243 EM_SE_C17 = 139, // Seiko Epson C17 family
244 EM_TI_C6000 = 140, // The Texas Instruments TMS320C6000 DSP family
245 EM_TI_C2000 = 141, // The Texas Instruments TMS320C2000 DSP family
246 EM_TI_C5500 = 142, // The Texas Instruments TMS320C55x DSP family
247 EM_MMDSP_PLUS = 160, // STMicroelectronics 64bit VLIW Data Signal Processor
248 EM_CYPRESS_M8C = 161, // Cypress M8C microprocessor
249 EM_R32C = 162, // Renesas R32C series microprocessors
250 EM_TRIMEDIA = 163, // NXP Semiconductors TriMedia architecture family
251 EM_HEXAGON = 164, // Qualcomm Hexagon processor
252 EM_8051 = 165, // Intel 8051 and variants
253 EM_STXP7X = 166, // STMicroelectronics STxP7x family of configurable
254 // and extensible RISC processors
255 EM_NDS32 = 167, // Andes Technology compact code size embedded RISC
256 // processor family
257 EM_ECOG1 = 168, // Cyan Technology eCOG1X family
258 EM_ECOG1X = 168, // Cyan Technology eCOG1X family
259 EM_MAXQ30 = 169, // Dallas Semiconductor MAXQ30 Core Micro-controllers
260 EM_XIMO16 = 170, // New Japan Radio (NJR) 16-bit DSP Processor
261 EM_MANIK = 171, // M2000 Reconfigurable RISC Microprocessor
262 EM_CRAYNV2 = 172, // Cray Inc. NV2 vector architecture
263 EM_RX = 173, // Renesas RX family
264 EM_METAG = 174, // Imagination Technologies META processor
265 // architecture
266 EM_MCST_ELBRUS = 175, // MCST Elbrus general purpose hardware architecture
267 EM_ECOG16 = 176, // Cyan Technology eCOG16 family
268 EM_CR16 = 177, // National Semiconductor CompactRISC CR16 16-bit
269 // microprocessor
270 EM_ETPU = 178, // Freescale Extended Time Processing Unit
271 EM_SLE9X = 179, // Infineon Technologies SLE9X core
272 EM_L10M = 180, // Intel L10M
273 EM_K10M = 181, // Intel K10M
274 EM_AARCH64 = 183, // ARM AArch64
275 EM_AVR32 = 185, // Atmel Corporation 32-bit microprocessor family
276 EM_STM8 = 186, // STMicroeletronics STM8 8-bit microcontroller
277 EM_TILE64 = 187, // Tilera TILE64 multicore architecture family
278 EM_TILEPRO = 188, // Tilera TILEPro multicore architecture family
279 EM_CUDA = 190, // NVIDIA CUDA architecture
280 EM_TILEGX = 191, // Tilera TILE-Gx multicore architecture family
281 EM_CLOUDSHIELD = 192, // CloudShield architecture family
282 EM_COREA_1ST = 193, // KIPO-KAIST Core-A 1st generation processor family
283 EM_COREA_2ND = 194, // KIPO-KAIST Core-A 2nd generation processor family
284 EM_ARC_COMPACT2 = 195, // Synopsys ARCompact V2
285 EM_OPEN8 = 196, // Open8 8-bit RISC soft processor core
286 EM_RL78 = 197, // Renesas RL78 family
287 EM_VIDEOCORE5 = 198, // Broadcom VideoCore V processor
288 EM_78KOR = 199, // Renesas 78KOR family
289 EM_56800EX = 200, // Freescale 56800EX Digital Signal Controller (DSC)
290 EM_BA1 = 201, // Beyond BA1 CPU architecture
291 EM_BA2 = 202, // Beyond BA2 CPU architecture
292 EM_XCORE = 203, // XMOS xCORE processor family
293 EM_MCHP_PIC = 204, // Microchip 8-bit PIC(r) family
294 EM_INTEL205 = 205, // Reserved by Intel
295 EM_INTEL206 = 206, // Reserved by Intel
296 EM_INTEL207 = 207, // Reserved by Intel
297 EM_INTEL208 = 208, // Reserved by Intel
298 EM_INTEL209 = 209, // Reserved by Intel
299 EM_KM32 = 210, // KM211 KM32 32-bit processor
300 EM_KMX32 = 211, // KM211 KMX32 32-bit processor
301 EM_KMX16 = 212, // KM211 KMX16 16-bit processor
302 EM_KMX8 = 213, // KM211 KMX8 8-bit processor
303 EM_KVARC = 214, // KM211 KVARC processor
304 EM_CDP = 215, // Paneve CDP architecture family
305 EM_COGE = 216, // Cognitive Smart Memory Processor
306 EM_COOL = 217, // iCelero CoolEngine
307 EM_NORC = 218, // Nanoradio Optimized RISC
308 EM_CSR_KALIMBA = 219, // CSR Kalimba architecture family
309 EM_AMDGPU = 224, // AMD GPU architecture
310 EM_RISCV = 243, // RISC-V
311 EM_LANAI = 244, // Lanai 32-bit processor
312 EM_BPF = 247, // Linux kernel bpf virtual machine
313
314 // A request has been made to the maintainer of the official registry for
315 // such numbers for an official value for WebAssembly. As soon as one is
316 // allocated, this enum will be updated to use it.
317 EM_WEBASSEMBLY = 0x4157, // WebAssembly architecture
318 };
319
320 // Object file classes.
321 enum {
322 ELFCLASSNONE = 0,
323 ELFCLASS32 = 1, // 32-bit object file
324 ELFCLASS64 = 2 // 64-bit object file
325 };
326
327 // Object file byte orderings.
328 enum {
329 ELFDATANONE = 0, // Invalid data encoding.
330 ELFDATA2LSB = 1, // Little-endian object file
331 ELFDATA2MSB = 2 // Big-endian object file
332 };
333
334 // OS ABI identification.
335 enum {
336 ELFOSABI_NONE = 0, // UNIX System V ABI
337 ELFOSABI_HPUX = 1, // HP-UX operating system
338 ELFOSABI_NETBSD = 2, // NetBSD
339 ELFOSABI_GNU = 3, // GNU/Linux
340 ELFOSABI_LINUX = 3, // Historical alias for ELFOSABI_GNU.
341 ELFOSABI_HURD = 4, // GNU/Hurd
342 ELFOSABI_SOLARIS = 6, // Solaris
343 ELFOSABI_AIX = 7, // AIX
344 ELFOSABI_IRIX = 8, // IRIX
345 ELFOSABI_FREEBSD = 9, // FreeBSD
346 ELFOSABI_TRU64 = 10, // TRU64 UNIX
347 ELFOSABI_MODESTO = 11, // Novell Modesto
348 ELFOSABI_OPENBSD = 12, // OpenBSD
349 ELFOSABI_OPENVMS = 13, // OpenVMS
350 ELFOSABI_NSK = 14, // Hewlett-Packard Non-Stop Kernel
351 ELFOSABI_AROS = 15, // AROS
352 ELFOSABI_FENIXOS = 16, // FenixOS
353 ELFOSABI_CLOUDABI = 17, // Nuxi CloudABI
354 ELFOSABI_C6000_ELFABI = 64, // Bare-metal TMS320C6000
355 ELFOSABI_AMDGPU_HSA = 64, // AMD HSA runtime
356 ELFOSABI_C6000_LINUX = 65, // Linux TMS320C6000
357 ELFOSABI_ARM = 97, // ARM
358 ELFOSABI_STANDALONE = 255 // Standalone (embedded) application
359 };
360
361 #define ELF_RELOC(name, value) name = value,
362
363 // X86_64 relocations.
364 enum {
365 #include "ELFRelocs/x86_64.def"
366 };
367
368 // i386 relocations.
369 enum {
370 #include "ELFRelocs/i386.def"
371 };
372
373 // ELF Relocation types for PPC32
374 enum {
375 #include "ELFRelocs/PowerPC.def"
376 };
377
378 // Specific e_flags for PPC64
379 enum {
380 // e_flags bits specifying ABI:
381 // 1 for original ABI using function descriptors,
382 // 2 for revised ABI without function descriptors,
383 // 0 for unspecified or not using any features affected by the differences.
384 EF_PPC64_ABI = 3
385 };
386
387 // Special values for the st_other field in the symbol table entry for PPC64.
388 enum {
389 STO_PPC64_LOCAL_BIT = 5,
390 STO_PPC64_LOCAL_MASK = (7 << STO_PPC64_LOCAL_BIT)
391 };
decodePPC64LocalEntryOffset(unsigned Other)392 static inline int64_t decodePPC64LocalEntryOffset(unsigned Other) {
393 unsigned Val = (Other & STO_PPC64_LOCAL_MASK) >> STO_PPC64_LOCAL_BIT;
394 return ((1 << Val) >> 2) << 2;
395 }
encodePPC64LocalEntryOffset(int64_t Offset)396 static inline unsigned encodePPC64LocalEntryOffset(int64_t Offset) {
397 unsigned Val =
398 (Offset >= 4 * 4 ? (Offset >= 8 * 4 ? (Offset >= 16 * 4 ? 6 : 5) : 4)
399 : (Offset >= 2 * 4 ? 3 : (Offset >= 1 * 4 ? 2 : 0)));
400 return Val << STO_PPC64_LOCAL_BIT;
401 }
402
403 // ELF Relocation types for PPC64
404 enum {
405 #include "ELFRelocs/PowerPC64.def"
406 };
407
408 // ELF Relocation types for AArch64
409 enum {
410 #include "ELFRelocs/AArch64.def"
411 };
412
413 // ARM Specific e_flags
414 enum : unsigned {
415 EF_ARM_SOFT_FLOAT = 0x00000200U,
416 EF_ARM_VFP_FLOAT = 0x00000400U,
417 EF_ARM_EABI_UNKNOWN = 0x00000000U,
418 EF_ARM_EABI_VER1 = 0x01000000U,
419 EF_ARM_EABI_VER2 = 0x02000000U,
420 EF_ARM_EABI_VER3 = 0x03000000U,
421 EF_ARM_EABI_VER4 = 0x04000000U,
422 EF_ARM_EABI_VER5 = 0x05000000U,
423 EF_ARM_EABIMASK = 0xFF000000U
424 };
425
426 // ELF Relocation types for ARM
427 enum {
428 #include "ELFRelocs/ARM.def"
429 };
430
431 // AVR specific e_flags
432 enum : unsigned {
433 EF_AVR_ARCH_AVR1 = 1,
434 EF_AVR_ARCH_AVR2 = 2,
435 EF_AVR_ARCH_AVR25 = 25,
436 EF_AVR_ARCH_AVR3 = 3,
437 EF_AVR_ARCH_AVR31 = 31,
438 EF_AVR_ARCH_AVR35 = 35,
439 EF_AVR_ARCH_AVR4 = 4,
440 EF_AVR_ARCH_AVR5 = 5,
441 EF_AVR_ARCH_AVR51 = 51,
442 EF_AVR_ARCH_AVR6 = 6,
443 EF_AVR_ARCH_AVRTINY = 100,
444 EF_AVR_ARCH_XMEGA1 = 101,
445 EF_AVR_ARCH_XMEGA2 = 102,
446 EF_AVR_ARCH_XMEGA3 = 103,
447 EF_AVR_ARCH_XMEGA4 = 104,
448 EF_AVR_ARCH_XMEGA5 = 105,
449 EF_AVR_ARCH_XMEGA6 = 106,
450 EF_AVR_ARCH_XMEGA7 = 107
451 };
452
453 // ELF Relocation types for AVR
454 enum {
455 #include "ELFRelocs/AVR.def"
456 };
457
458 // Mips Specific e_flags
459 enum : unsigned {
460 EF_MIPS_NOREORDER = 0x00000001, // Don't reorder instructions
461 EF_MIPS_PIC = 0x00000002, // Position independent code
462 EF_MIPS_CPIC = 0x00000004, // Call object with Position independent code
463 EF_MIPS_ABI2 = 0x00000020, // File uses N32 ABI
464 EF_MIPS_32BITMODE = 0x00000100, // Code compiled for a 64-bit machine
465 // in 32-bit mode
466 EF_MIPS_FP64 = 0x00000200, // Code compiled for a 32-bit machine
467 // but uses 64-bit FP registers
468 EF_MIPS_NAN2008 = 0x00000400, // Uses IEE 754-2008 NaN encoding
469
470 // ABI flags
471 EF_MIPS_ABI_O32 = 0x00001000, // This file follows the first MIPS 32 bit ABI
472 EF_MIPS_ABI_O64 = 0x00002000, // O32 ABI extended for 64-bit architecture.
473 EF_MIPS_ABI_EABI32 = 0x00003000, // EABI in 32 bit mode.
474 EF_MIPS_ABI_EABI64 = 0x00004000, // EABI in 64 bit mode.
475 EF_MIPS_ABI = 0x0000f000, // Mask for selecting EF_MIPS_ABI_ variant.
476
477 // MIPS machine variant
478 EF_MIPS_MACH_NONE = 0x00000000, // A standard MIPS implementation.
479 EF_MIPS_MACH_3900 = 0x00810000, // Toshiba R3900
480 EF_MIPS_MACH_4010 = 0x00820000, // LSI R4010
481 EF_MIPS_MACH_4100 = 0x00830000, // NEC VR4100
482 EF_MIPS_MACH_4650 = 0x00850000, // MIPS R4650
483 EF_MIPS_MACH_4120 = 0x00870000, // NEC VR4120
484 EF_MIPS_MACH_4111 = 0x00880000, // NEC VR4111/VR4181
485 EF_MIPS_MACH_SB1 = 0x008a0000, // Broadcom SB-1
486 EF_MIPS_MACH_OCTEON = 0x008b0000, // Cavium Networks Octeon
487 EF_MIPS_MACH_XLR = 0x008c0000, // RMI Xlr
488 EF_MIPS_MACH_OCTEON2 = 0x008d0000, // Cavium Networks Octeon2
489 EF_MIPS_MACH_OCTEON3 = 0x008e0000, // Cavium Networks Octeon3
490 EF_MIPS_MACH_5400 = 0x00910000, // NEC VR5400
491 EF_MIPS_MACH_5900 = 0x00920000, // MIPS R5900
492 EF_MIPS_MACH_5500 = 0x00980000, // NEC VR5500
493 EF_MIPS_MACH_9000 = 0x00990000, // Unknown
494 EF_MIPS_MACH_LS2E = 0x00a00000, // ST Microelectronics Loongson 2E
495 EF_MIPS_MACH_LS2F = 0x00a10000, // ST Microelectronics Loongson 2F
496 EF_MIPS_MACH_LS3A = 0x00a20000, // Loongson 3A
497 EF_MIPS_MACH = 0x00ff0000, // EF_MIPS_MACH_xxx selection mask
498
499 // ARCH_ASE
500 EF_MIPS_MICROMIPS = 0x02000000, // microMIPS
501 EF_MIPS_ARCH_ASE_M16 = 0x04000000, // Has Mips-16 ISA extensions
502 EF_MIPS_ARCH_ASE_MDMX = 0x08000000, // Has MDMX multimedia extensions
503 EF_MIPS_ARCH_ASE = 0x0f000000, // Mask for EF_MIPS_ARCH_ASE_xxx flags
504
505 // ARCH
506 EF_MIPS_ARCH_1 = 0x00000000, // MIPS1 instruction set
507 EF_MIPS_ARCH_2 = 0x10000000, // MIPS2 instruction set
508 EF_MIPS_ARCH_3 = 0x20000000, // MIPS3 instruction set
509 EF_MIPS_ARCH_4 = 0x30000000, // MIPS4 instruction set
510 EF_MIPS_ARCH_5 = 0x40000000, // MIPS5 instruction set
511 EF_MIPS_ARCH_32 = 0x50000000, // MIPS32 instruction set per linux not elf.h
512 EF_MIPS_ARCH_64 = 0x60000000, // MIPS64 instruction set per linux not elf.h
513 EF_MIPS_ARCH_32R2 = 0x70000000, // mips32r2, mips32r3, mips32r5
514 EF_MIPS_ARCH_64R2 = 0x80000000, // mips64r2, mips64r3, mips64r5
515 EF_MIPS_ARCH_32R6 = 0x90000000, // mips32r6
516 EF_MIPS_ARCH_64R6 = 0xa0000000, // mips64r6
517 EF_MIPS_ARCH = 0xf0000000 // Mask for applying EF_MIPS_ARCH_ variant
518 };
519
520 // ELF Relocation types for Mips
521 enum {
522 #include "ELFRelocs/Mips.def"
523 };
524
525 // Special values for the st_other field in the symbol table entry for MIPS.
526 enum {
527 STO_MIPS_OPTIONAL = 0x04, // Symbol whose definition is optional
528 STO_MIPS_PLT = 0x08, // PLT entry related dynamic table record
529 STO_MIPS_PIC = 0x20, // PIC func in an object mixes PIC/non-PIC
530 STO_MIPS_MICROMIPS = 0x80, // MIPS Specific ISA for MicroMips
531 STO_MIPS_MIPS16 = 0xf0 // MIPS Specific ISA for Mips16
532 };
533
534 // .MIPS.options section descriptor kinds
535 enum {
536 ODK_NULL = 0, // Undefined
537 ODK_REGINFO = 1, // Register usage information
538 ODK_EXCEPTIONS = 2, // Exception processing options
539 ODK_PAD = 3, // Section padding options
540 ODK_HWPATCH = 4, // Hardware patches applied
541 ODK_FILL = 5, // Linker fill value
542 ODK_TAGS = 6, // Space for tool identification
543 ODK_HWAND = 7, // Hardware AND patches applied
544 ODK_HWOR = 8, // Hardware OR patches applied
545 ODK_GP_GROUP = 9, // GP group to use for text/data sections
546 ODK_IDENT = 10, // ID information
547 ODK_PAGESIZE = 11 // Page size information
548 };
549
550 // Hexagon-specific e_flags
551 enum {
552 // Object processor version flags, bits[11:0]
553 EF_HEXAGON_MACH_V2 = 0x00000001, // Hexagon V2
554 EF_HEXAGON_MACH_V3 = 0x00000002, // Hexagon V3
555 EF_HEXAGON_MACH_V4 = 0x00000003, // Hexagon V4
556 EF_HEXAGON_MACH_V5 = 0x00000004, // Hexagon V5
557 EF_HEXAGON_MACH_V55 = 0x00000005, // Hexagon V55
558 EF_HEXAGON_MACH_V60 = 0x00000060, // Hexagon V60
559
560 // Highest ISA version flags
561 EF_HEXAGON_ISA_MACH = 0x00000000, // Same as specified in bits[11:0]
562 // of e_flags
563 EF_HEXAGON_ISA_V2 = 0x00000010, // Hexagon V2 ISA
564 EF_HEXAGON_ISA_V3 = 0x00000020, // Hexagon V3 ISA
565 EF_HEXAGON_ISA_V4 = 0x00000030, // Hexagon V4 ISA
566 EF_HEXAGON_ISA_V5 = 0x00000040, // Hexagon V5 ISA
567 EF_HEXAGON_ISA_V55 = 0x00000050, // Hexagon V55 ISA
568 EF_HEXAGON_ISA_V60 = 0x00000060, // Hexagon V60 ISA
569 };
570
571 // Hexagon-specific section indexes for common small data
572 enum {
573 SHN_HEXAGON_SCOMMON = 0xff00, // Other access sizes
574 SHN_HEXAGON_SCOMMON_1 = 0xff01, // Byte-sized access
575 SHN_HEXAGON_SCOMMON_2 = 0xff02, // Half-word-sized access
576 SHN_HEXAGON_SCOMMON_4 = 0xff03, // Word-sized access
577 SHN_HEXAGON_SCOMMON_8 = 0xff04 // Double-word-size access
578 };
579
580 // ELF Relocation types for Hexagon
581 enum {
582 #include "ELFRelocs/Hexagon.def"
583 };
584
585 // ELF Relocation type for Lanai.
586 enum {
587 #include "ELFRelocs/Lanai.def"
588 };
589
590 // ELF Relocation types for RISC-V
591 enum {
592 #include "ELFRelocs/RISCV.def"
593 };
594
595 // ELF Relocation types for S390/zSeries
596 enum {
597 #include "ELFRelocs/SystemZ.def"
598 };
599
600 // ELF Relocation type for Sparc.
601 enum {
602 #include "ELFRelocs/Sparc.def"
603 };
604
605 // ELF Relocation types for WebAssembly
606 enum {
607 #include "ELFRelocs/WebAssembly.def"
608 };
609
610 // ELF Relocation types for AMDGPU
611 enum {
612 #include "ELFRelocs/AMDGPU.def"
613 };
614
615 // ELF Relocation types for BPF
616 enum {
617 #include "ELFRelocs/BPF.def"
618 };
619
620 #undef ELF_RELOC
621
622 // Section header.
623 struct Elf32_Shdr {
624 Elf32_Word sh_name; // Section name (index into string table)
625 Elf32_Word sh_type; // Section type (SHT_*)
626 Elf32_Word sh_flags; // Section flags (SHF_*)
627 Elf32_Addr sh_addr; // Address where section is to be loaded
628 Elf32_Off sh_offset; // File offset of section data, in bytes
629 Elf32_Word sh_size; // Size of section, in bytes
630 Elf32_Word sh_link; // Section type-specific header table index link
631 Elf32_Word sh_info; // Section type-specific extra information
632 Elf32_Word sh_addralign; // Section address alignment
633 Elf32_Word sh_entsize; // Size of records contained within the section
634 };
635
636 // Section header for ELF64 - same fields as ELF32, different types.
637 struct Elf64_Shdr {
638 Elf64_Word sh_name;
639 Elf64_Word sh_type;
640 Elf64_Xword sh_flags;
641 Elf64_Addr sh_addr;
642 Elf64_Off sh_offset;
643 Elf64_Xword sh_size;
644 Elf64_Word sh_link;
645 Elf64_Word sh_info;
646 Elf64_Xword sh_addralign;
647 Elf64_Xword sh_entsize;
648 };
649
650 // Special section indices.
651 enum {
652 SHN_UNDEF = 0, // Undefined, missing, irrelevant, or meaningless
653 SHN_LORESERVE = 0xff00, // Lowest reserved index
654 SHN_LOPROC = 0xff00, // Lowest processor-specific index
655 SHN_HIPROC = 0xff1f, // Highest processor-specific index
656 SHN_LOOS = 0xff20, // Lowest operating system-specific index
657 SHN_HIOS = 0xff3f, // Highest operating system-specific index
658 SHN_ABS = 0xfff1, // Symbol has absolute value; does not need relocation
659 SHN_COMMON = 0xfff2, // FORTRAN COMMON or C external global variables
660 SHN_XINDEX = 0xffff, // Mark that the index is >= SHN_LORESERVE
661 SHN_HIRESERVE = 0xffff // Highest reserved index
662 };
663
664 // Section types.
665 enum : unsigned {
666 SHT_NULL = 0, // No associated section (inactive entry).
667 SHT_PROGBITS = 1, // Program-defined contents.
668 SHT_SYMTAB = 2, // Symbol table.
669 SHT_STRTAB = 3, // String table.
670 SHT_RELA = 4, // Relocation entries; explicit addends.
671 SHT_HASH = 5, // Symbol hash table.
672 SHT_DYNAMIC = 6, // Information for dynamic linking.
673 SHT_NOTE = 7, // Information about the file.
674 SHT_NOBITS = 8, // Data occupies no space in the file.
675 SHT_REL = 9, // Relocation entries; no explicit addends.
676 SHT_SHLIB = 10, // Reserved.
677 SHT_DYNSYM = 11, // Symbol table.
678 SHT_INIT_ARRAY = 14, // Pointers to initialization functions.
679 SHT_FINI_ARRAY = 15, // Pointers to termination functions.
680 SHT_PREINIT_ARRAY = 16, // Pointers to pre-init functions.
681 SHT_GROUP = 17, // Section group.
682 SHT_SYMTAB_SHNDX = 18, // Indices for SHN_XINDEX entries.
683 SHT_LOOS = 0x60000000, // Lowest operating system-specific type.
684 SHT_GNU_ATTRIBUTES = 0x6ffffff5, // Object attributes.
685 SHT_GNU_HASH = 0x6ffffff6, // GNU-style hash table.
686 SHT_GNU_verdef = 0x6ffffffd, // GNU version definitions.
687 SHT_GNU_verneed = 0x6ffffffe, // GNU version references.
688 SHT_GNU_versym = 0x6fffffff, // GNU symbol versions table.
689 SHT_HIOS = 0x6fffffff, // Highest operating system-specific type.
690 SHT_LOPROC = 0x70000000, // Lowest processor arch-specific type.
691 // Fixme: All this is duplicated in MCSectionELF. Why??
692 // Exception Index table
693 SHT_ARM_EXIDX = 0x70000001U,
694 // BPABI DLL dynamic linking pre-emption map
695 SHT_ARM_PREEMPTMAP = 0x70000002U,
696 // Object file compatibility attributes
697 SHT_ARM_ATTRIBUTES = 0x70000003U,
698 SHT_ARM_DEBUGOVERLAY = 0x70000004U,
699 SHT_ARM_OVERLAYSECTION = 0x70000005U,
700 SHT_HEX_ORDERED = 0x70000000, // Link editor is to sort the entries in
701 // this section based on their sizes
702 SHT_X86_64_UNWIND = 0x70000001, // Unwind information
703
704 SHT_MIPS_REGINFO = 0x70000006, // Register usage information
705 SHT_MIPS_OPTIONS = 0x7000000d, // General options
706 SHT_MIPS_ABIFLAGS = 0x7000002a, // ABI information.
707
708 SHT_HIPROC = 0x7fffffff, // Highest processor arch-specific type.
709 SHT_LOUSER = 0x80000000, // Lowest type reserved for applications.
710 SHT_HIUSER = 0xffffffff // Highest type reserved for applications.
711 };
712
713 // Section flags.
714 enum : unsigned {
715 // Section data should be writable during execution.
716 SHF_WRITE = 0x1,
717
718 // Section occupies memory during program execution.
719 SHF_ALLOC = 0x2,
720
721 // Section contains executable machine instructions.
722 SHF_EXECINSTR = 0x4,
723
724 // The data in this section may be merged.
725 SHF_MERGE = 0x10,
726
727 // The data in this section is null-terminated strings.
728 SHF_STRINGS = 0x20,
729
730 // A field in this section holds a section header table index.
731 SHF_INFO_LINK = 0x40U,
732
733 // Adds special ordering requirements for link editors.
734 SHF_LINK_ORDER = 0x80U,
735
736 // This section requires special OS-specific processing to avoid incorrect
737 // behavior.
738 SHF_OS_NONCONFORMING = 0x100U,
739
740 // This section is a member of a section group.
741 SHF_GROUP = 0x200U,
742
743 // This section holds Thread-Local Storage.
744 SHF_TLS = 0x400U,
745
746 // Identifies a section containing compressed data.
747 SHF_COMPRESSED = 0x800U,
748
749 // This section is excluded from the final executable or shared library.
750 SHF_EXCLUDE = 0x80000000U,
751
752 // Start of target-specific flags.
753
754 /// XCORE_SHF_CP_SECTION - All sections with the "c" flag are grouped
755 /// together by the linker to form the constant pool and the cp register is
756 /// set to the start of the constant pool by the boot code.
757 XCORE_SHF_CP_SECTION = 0x800U,
758
759 /// XCORE_SHF_DP_SECTION - All sections with the "d" flag are grouped
760 /// together by the linker to form the data section and the dp register is
761 /// set to the start of the section by the boot code.
762 XCORE_SHF_DP_SECTION = 0x1000U,
763
764 SHF_MASKOS = 0x0ff00000,
765
766 // Bits indicating processor-specific flags.
767 SHF_MASKPROC = 0xf0000000,
768
769 // If an object file section does not have this flag set, then it may not hold
770 // more than 2GB and can be freely referred to in objects using smaller code
771 // models. Otherwise, only objects using larger code models can refer to them.
772 // For example, a medium code model object can refer to data in a section that
773 // sets this flag besides being able to refer to data in a section that does
774 // not set it; likewise, a small code model object can refer only to code in a
775 // section that does not set this flag.
776 SHF_X86_64_LARGE = 0x10000000,
777
778 // All sections with the GPREL flag are grouped into a global data area
779 // for faster accesses
780 SHF_HEX_GPREL = 0x10000000,
781
782 // Section contains text/data which may be replicated in other sections.
783 // Linker must retain only one copy.
784 SHF_MIPS_NODUPES = 0x01000000,
785
786 // Linker must generate implicit hidden weak names.
787 SHF_MIPS_NAMES = 0x02000000,
788
789 // Section data local to process.
790 SHF_MIPS_LOCAL = 0x04000000,
791
792 // Do not strip this section.
793 SHF_MIPS_NOSTRIP = 0x08000000,
794
795 // Section must be part of global data area.
796 SHF_MIPS_GPREL = 0x10000000,
797
798 // This section should be merged.
799 SHF_MIPS_MERGE = 0x20000000,
800
801 // Address size to be inferred from section entry size.
802 SHF_MIPS_ADDR = 0x40000000,
803
804 // Section data is string data by default.
805 SHF_MIPS_STRING = 0x80000000,
806
807 // Make code section unreadable when in execute-only mode
808 SHF_ARM_PURECODE = 0x20000000,
809
810 SHF_AMDGPU_HSA_GLOBAL = 0x00100000,
811 SHF_AMDGPU_HSA_READONLY = 0x00200000,
812 SHF_AMDGPU_HSA_CODE = 0x00400000,
813 SHF_AMDGPU_HSA_AGENT = 0x00800000
814 };
815
816 // Section Group Flags
817 enum : unsigned {
818 GRP_COMDAT = 0x1,
819 GRP_MASKOS = 0x0ff00000,
820 GRP_MASKPROC = 0xf0000000
821 };
822
823 // Symbol table entries for ELF32.
824 struct Elf32_Sym {
825 Elf32_Word st_name; // Symbol name (index into string table)
826 Elf32_Addr st_value; // Value or address associated with the symbol
827 Elf32_Word st_size; // Size of the symbol
828 unsigned char st_info; // Symbol's type and binding attributes
829 unsigned char st_other; // Must be zero; reserved
830 Elf32_Half st_shndx; // Which section (header table index) it's defined in
831
832 // These accessors and mutators correspond to the ELF32_ST_BIND,
833 // ELF32_ST_TYPE, and ELF32_ST_INFO macros defined in the ELF specification:
getBindingElf32_Sym834 unsigned char getBinding() const { return st_info >> 4; }
getTypeElf32_Sym835 unsigned char getType() const { return st_info & 0x0f; }
setBindingElf32_Sym836 void setBinding(unsigned char b) { setBindingAndType(b, getType()); }
setTypeElf32_Sym837 void setType(unsigned char t) { setBindingAndType(getBinding(), t); }
setBindingAndTypeElf32_Sym838 void setBindingAndType(unsigned char b, unsigned char t) {
839 st_info = (b << 4) + (t & 0x0f);
840 }
841 };
842
843 // Symbol table entries for ELF64.
844 struct Elf64_Sym {
845 Elf64_Word st_name; // Symbol name (index into string table)
846 unsigned char st_info; // Symbol's type and binding attributes
847 unsigned char st_other; // Must be zero; reserved
848 Elf64_Half st_shndx; // Which section (header tbl index) it's defined in
849 Elf64_Addr st_value; // Value or address associated with the symbol
850 Elf64_Xword st_size; // Size of the symbol
851
852 // These accessors and mutators are identical to those defined for ELF32
853 // symbol table entries.
getBindingElf64_Sym854 unsigned char getBinding() const { return st_info >> 4; }
getTypeElf64_Sym855 unsigned char getType() const { return st_info & 0x0f; }
setBindingElf64_Sym856 void setBinding(unsigned char b) { setBindingAndType(b, getType()); }
setTypeElf64_Sym857 void setType(unsigned char t) { setBindingAndType(getBinding(), t); }
setBindingAndTypeElf64_Sym858 void setBindingAndType(unsigned char b, unsigned char t) {
859 st_info = (b << 4) + (t & 0x0f);
860 }
861 };
862
863 // The size (in bytes) of symbol table entries.
864 enum {
865 SYMENTRY_SIZE32 = 16, // 32-bit symbol entry size
866 SYMENTRY_SIZE64 = 24 // 64-bit symbol entry size.
867 };
868
869 // Symbol bindings.
870 enum {
871 STB_LOCAL = 0, // Local symbol, not visible outside obj file containing def
872 STB_GLOBAL = 1, // Global symbol, visible to all object files being combined
873 STB_WEAK = 2, // Weak symbol, like global but lower-precedence
874 STB_GNU_UNIQUE = 10,
875 STB_LOOS = 10, // Lowest operating system-specific binding type
876 STB_HIOS = 12, // Highest operating system-specific binding type
877 STB_LOPROC = 13, // Lowest processor-specific binding type
878 STB_HIPROC = 15 // Highest processor-specific binding type
879 };
880
881 // Symbol types.
882 enum {
883 STT_NOTYPE = 0, // Symbol's type is not specified
884 STT_OBJECT = 1, // Symbol is a data object (variable, array, etc.)
885 STT_FUNC = 2, // Symbol is executable code (function, etc.)
886 STT_SECTION = 3, // Symbol refers to a section
887 STT_FILE = 4, // Local, absolute symbol that refers to a file
888 STT_COMMON = 5, // An uninitialized common block
889 STT_TLS = 6, // Thread local data object
890 STT_GNU_IFUNC = 10, // GNU indirect function
891 STT_LOOS = 10, // Lowest operating system-specific symbol type
892 STT_HIOS = 12, // Highest operating system-specific symbol type
893 STT_LOPROC = 13, // Lowest processor-specific symbol type
894 STT_HIPROC = 15, // Highest processor-specific symbol type
895
896 // AMDGPU symbol types
897 STT_AMDGPU_HSA_KERNEL = 10,
898 STT_AMDGPU_HSA_INDIRECT_FUNCTION = 11,
899 STT_AMDGPU_HSA_METADATA = 12
900 };
901
902 enum {
903 STV_DEFAULT = 0, // Visibility is specified by binding type
904 STV_INTERNAL = 1, // Defined by processor supplements
905 STV_HIDDEN = 2, // Not visible to other components
906 STV_PROTECTED = 3 // Visible in other components but not preemptable
907 };
908
909 // Symbol number.
910 enum { STN_UNDEF = 0 };
911
912 // Special relocation symbols used in the MIPS64 ELF relocation entries
913 enum {
914 RSS_UNDEF = 0, // None
915 RSS_GP = 1, // Value of gp
916 RSS_GP0 = 2, // Value of gp used to create object being relocated
917 RSS_LOC = 3 // Address of location being relocated
918 };
919
920 // Relocation entry, without explicit addend.
921 struct Elf32_Rel {
922 Elf32_Addr r_offset; // Location (file byte offset, or program virtual addr)
923 Elf32_Word r_info; // Symbol table index and type of relocation to apply
924
925 // These accessors and mutators correspond to the ELF32_R_SYM, ELF32_R_TYPE,
926 // and ELF32_R_INFO macros defined in the ELF specification:
getSymbolElf32_Rel927 Elf32_Word getSymbol() const { return (r_info >> 8); }
getTypeElf32_Rel928 unsigned char getType() const { return (unsigned char)(r_info & 0x0ff); }
setSymbolElf32_Rel929 void setSymbol(Elf32_Word s) { setSymbolAndType(s, getType()); }
setTypeElf32_Rel930 void setType(unsigned char t) { setSymbolAndType(getSymbol(), t); }
setSymbolAndTypeElf32_Rel931 void setSymbolAndType(Elf32_Word s, unsigned char t) {
932 r_info = (s << 8) + t;
933 }
934 };
935
936 // Relocation entry with explicit addend.
937 struct Elf32_Rela {
938 Elf32_Addr r_offset; // Location (file byte offset, or program virtual addr)
939 Elf32_Word r_info; // Symbol table index and type of relocation to apply
940 Elf32_Sword r_addend; // Compute value for relocatable field by adding this
941
942 // These accessors and mutators correspond to the ELF32_R_SYM, ELF32_R_TYPE,
943 // and ELF32_R_INFO macros defined in the ELF specification:
getSymbolElf32_Rela944 Elf32_Word getSymbol() const { return (r_info >> 8); }
getTypeElf32_Rela945 unsigned char getType() const { return (unsigned char)(r_info & 0x0ff); }
setSymbolElf32_Rela946 void setSymbol(Elf32_Word s) { setSymbolAndType(s, getType()); }
setTypeElf32_Rela947 void setType(unsigned char t) { setSymbolAndType(getSymbol(), t); }
setSymbolAndTypeElf32_Rela948 void setSymbolAndType(Elf32_Word s, unsigned char t) {
949 r_info = (s << 8) + t;
950 }
951 };
952
953 // Relocation entry, without explicit addend.
954 struct Elf64_Rel {
955 Elf64_Addr r_offset; // Location (file byte offset, or program virtual addr).
956 Elf64_Xword r_info; // Symbol table index and type of relocation to apply.
957
958 // These accessors and mutators correspond to the ELF64_R_SYM, ELF64_R_TYPE,
959 // and ELF64_R_INFO macros defined in the ELF specification:
getSymbolElf64_Rel960 Elf64_Word getSymbol() const { return (r_info >> 32); }
getTypeElf64_Rel961 Elf64_Word getType() const { return (Elf64_Word)(r_info & 0xffffffffL); }
setSymbolElf64_Rel962 void setSymbol(Elf64_Word s) { setSymbolAndType(s, getType()); }
setTypeElf64_Rel963 void setType(Elf64_Word t) { setSymbolAndType(getSymbol(), t); }
setSymbolAndTypeElf64_Rel964 void setSymbolAndType(Elf64_Word s, Elf64_Word t) {
965 r_info = ((Elf64_Xword)s << 32) + (t & 0xffffffffL);
966 }
967 };
968
969 // Relocation entry with explicit addend.
970 struct Elf64_Rela {
971 Elf64_Addr r_offset; // Location (file byte offset, or program virtual addr).
972 Elf64_Xword r_info; // Symbol table index and type of relocation to apply.
973 Elf64_Sxword r_addend; // Compute value for relocatable field by adding this.
974
975 // These accessors and mutators correspond to the ELF64_R_SYM, ELF64_R_TYPE,
976 // and ELF64_R_INFO macros defined in the ELF specification:
getSymbolElf64_Rela977 Elf64_Word getSymbol() const { return (r_info >> 32); }
getTypeElf64_Rela978 Elf64_Word getType() const { return (Elf64_Word)(r_info & 0xffffffffL); }
setSymbolElf64_Rela979 void setSymbol(Elf64_Word s) { setSymbolAndType(s, getType()); }
setTypeElf64_Rela980 void setType(Elf64_Word t) { setSymbolAndType(getSymbol(), t); }
setSymbolAndTypeElf64_Rela981 void setSymbolAndType(Elf64_Word s, Elf64_Word t) {
982 r_info = ((Elf64_Xword)s << 32) + (t & 0xffffffffL);
983 }
984 };
985
986 // Program header for ELF32.
987 struct Elf32_Phdr {
988 Elf32_Word p_type; // Type of segment
989 Elf32_Off p_offset; // File offset where segment is located, in bytes
990 Elf32_Addr p_vaddr; // Virtual address of beginning of segment
991 Elf32_Addr p_paddr; // Physical address of beginning of segment (OS-specific)
992 Elf32_Word p_filesz; // Num. of bytes in file image of segment (may be zero)
993 Elf32_Word p_memsz; // Num. of bytes in mem image of segment (may be zero)
994 Elf32_Word p_flags; // Segment flags
995 Elf32_Word p_align; // Segment alignment constraint
996 };
997
998 // Program header for ELF64.
999 struct Elf64_Phdr {
1000 Elf64_Word p_type; // Type of segment
1001 Elf64_Word p_flags; // Segment flags
1002 Elf64_Off p_offset; // File offset where segment is located, in bytes
1003 Elf64_Addr p_vaddr; // Virtual address of beginning of segment
1004 Elf64_Addr p_paddr; // Physical addr of beginning of segment (OS-specific)
1005 Elf64_Xword p_filesz; // Num. of bytes in file image of segment (may be zero)
1006 Elf64_Xword p_memsz; // Num. of bytes in mem image of segment (may be zero)
1007 Elf64_Xword p_align; // Segment alignment constraint
1008 };
1009
1010 // Segment types.
1011 enum {
1012 PT_NULL = 0, // Unused segment.
1013 PT_LOAD = 1, // Loadable segment.
1014 PT_DYNAMIC = 2, // Dynamic linking information.
1015 PT_INTERP = 3, // Interpreter pathname.
1016 PT_NOTE = 4, // Auxiliary information.
1017 PT_SHLIB = 5, // Reserved.
1018 PT_PHDR = 6, // The program header table itself.
1019 PT_TLS = 7, // The thread-local storage template.
1020 PT_LOOS = 0x60000000, // Lowest operating system-specific pt entry type.
1021 PT_HIOS = 0x6fffffff, // Highest operating system-specific pt entry type.
1022 PT_LOPROC = 0x70000000, // Lowest processor-specific program hdr entry type.
1023 PT_HIPROC = 0x7fffffff, // Highest processor-specific program hdr entry type.
1024
1025 // x86-64 program header types.
1026 // These all contain stack unwind tables.
1027 PT_GNU_EH_FRAME = 0x6474e550,
1028 PT_SUNW_EH_FRAME = 0x6474e550,
1029 PT_SUNW_UNWIND = 0x6464e550,
1030
1031 PT_GNU_STACK = 0x6474e551, // Indicates stack executability.
1032 PT_GNU_RELRO = 0x6474e552, // Read-only after relocation.
1033
1034 PT_OPENBSD_RANDOMIZE = 0x65a3dbe6, // Fill with random data.
1035 PT_OPENBSD_WXNEEDED = 0x65a3dbe7, // Program does W^X violations.
1036 PT_OPENBSD_BOOTDATA = 0x65a41be6, // Section for boot arguments.
1037
1038 // ARM program header types.
1039 PT_ARM_ARCHEXT = 0x70000000, // Platform architecture compatibility info
1040 // These all contain stack unwind tables.
1041 PT_ARM_EXIDX = 0x70000001,
1042 PT_ARM_UNWIND = 0x70000001,
1043
1044 // MIPS program header types.
1045 PT_MIPS_REGINFO = 0x70000000, // Register usage information.
1046 PT_MIPS_RTPROC = 0x70000001, // Runtime procedure table.
1047 PT_MIPS_OPTIONS = 0x70000002, // Options segment.
1048 PT_MIPS_ABIFLAGS = 0x70000003, // Abiflags segment.
1049
1050 // AMDGPU program header types.
1051 PT_AMDGPU_HSA_LOAD_GLOBAL_PROGRAM = 0x60000000,
1052 PT_AMDGPU_HSA_LOAD_GLOBAL_AGENT = 0x60000001,
1053 PT_AMDGPU_HSA_LOAD_READONLY_AGENT = 0x60000002,
1054 PT_AMDGPU_HSA_LOAD_CODE_AGENT = 0x60000003,
1055
1056 // WebAssembly program header types.
1057 PT_WEBASSEMBLY_FUNCTIONS = PT_LOPROC + 0, // Function definitions.
1058 };
1059
1060 // Segment flag bits.
1061 enum : unsigned {
1062 PF_X = 1, // Execute
1063 PF_W = 2, // Write
1064 PF_R = 4, // Read
1065 PF_MASKOS = 0x0ff00000, // Bits for operating system-specific semantics.
1066 PF_MASKPROC = 0xf0000000 // Bits for processor-specific semantics.
1067 };
1068
1069 // Dynamic table entry for ELF32.
1070 struct Elf32_Dyn {
1071 Elf32_Sword d_tag; // Type of dynamic table entry.
1072 union {
1073 Elf32_Word d_val; // Integer value of entry.
1074 Elf32_Addr d_ptr; // Pointer value of entry.
1075 } d_un;
1076 };
1077
1078 // Dynamic table entry for ELF64.
1079 struct Elf64_Dyn {
1080 Elf64_Sxword d_tag; // Type of dynamic table entry.
1081 union {
1082 Elf64_Xword d_val; // Integer value of entry.
1083 Elf64_Addr d_ptr; // Pointer value of entry.
1084 } d_un;
1085 };
1086
1087 // Dynamic table entry tags.
1088 enum {
1089 DT_NULL = 0, // Marks end of dynamic array.
1090 DT_NEEDED = 1, // String table offset of needed library.
1091 DT_PLTRELSZ = 2, // Size of relocation entries in PLT.
1092 DT_PLTGOT = 3, // Address associated with linkage table.
1093 DT_HASH = 4, // Address of symbolic hash table.
1094 DT_STRTAB = 5, // Address of dynamic string table.
1095 DT_SYMTAB = 6, // Address of dynamic symbol table.
1096 DT_RELA = 7, // Address of relocation table (Rela entries).
1097 DT_RELASZ = 8, // Size of Rela relocation table.
1098 DT_RELAENT = 9, // Size of a Rela relocation entry.
1099 DT_STRSZ = 10, // Total size of the string table.
1100 DT_SYMENT = 11, // Size of a symbol table entry.
1101 DT_INIT = 12, // Address of initialization function.
1102 DT_FINI = 13, // Address of termination function.
1103 DT_SONAME = 14, // String table offset of a shared objects name.
1104 DT_RPATH = 15, // String table offset of library search path.
1105 DT_SYMBOLIC = 16, // Changes symbol resolution algorithm.
1106 DT_REL = 17, // Address of relocation table (Rel entries).
1107 DT_RELSZ = 18, // Size of Rel relocation table.
1108 DT_RELENT = 19, // Size of a Rel relocation entry.
1109 DT_PLTREL = 20, // Type of relocation entry used for linking.
1110 DT_DEBUG = 21, // Reserved for debugger.
1111 DT_TEXTREL = 22, // Relocations exist for non-writable segments.
1112 DT_JMPREL = 23, // Address of relocations associated with PLT.
1113 DT_BIND_NOW = 24, // Process all relocations before execution.
1114 DT_INIT_ARRAY = 25, // Pointer to array of initialization functions.
1115 DT_FINI_ARRAY = 26, // Pointer to array of termination functions.
1116 DT_INIT_ARRAYSZ = 27, // Size of DT_INIT_ARRAY.
1117 DT_FINI_ARRAYSZ = 28, // Size of DT_FINI_ARRAY.
1118 DT_RUNPATH = 29, // String table offset of lib search path.
1119 DT_FLAGS = 30, // Flags.
1120 DT_ENCODING = 32, // Values from here to DT_LOOS follow the rules
1121 // for the interpretation of the d_un union.
1122
1123 DT_PREINIT_ARRAY = 32, // Pointer to array of preinit functions.
1124 DT_PREINIT_ARRAYSZ = 33, // Size of the DT_PREINIT_ARRAY array.
1125
1126 DT_LOOS = 0x60000000, // Start of environment specific tags.
1127 DT_HIOS = 0x6FFFFFFF, // End of environment specific tags.
1128 DT_LOPROC = 0x70000000, // Start of processor specific tags.
1129 DT_HIPROC = 0x7FFFFFFF, // End of processor specific tags.
1130
1131 DT_GNU_HASH = 0x6FFFFEF5, // Reference to the GNU hash table.
1132 DT_TLSDESC_PLT =
1133 0x6FFFFEF6, // Location of PLT entry for TLS descriptor resolver calls.
1134 DT_TLSDESC_GOT = 0x6FFFFEF7, // Location of GOT entry used by TLS descriptor
1135 // resolver PLT entry.
1136 DT_RELACOUNT = 0x6FFFFFF9, // ELF32_Rela count.
1137 DT_RELCOUNT = 0x6FFFFFFA, // ELF32_Rel count.
1138
1139 DT_FLAGS_1 = 0X6FFFFFFB, // Flags_1.
1140 DT_VERSYM = 0x6FFFFFF0, // The address of .gnu.version section.
1141 DT_VERDEF = 0X6FFFFFFC, // The address of the version definition table.
1142 DT_VERDEFNUM = 0X6FFFFFFD, // The number of entries in DT_VERDEF.
1143 DT_VERNEED = 0X6FFFFFFE, // The address of the version Dependency table.
1144 DT_VERNEEDNUM = 0X6FFFFFFF, // The number of entries in DT_VERNEED.
1145
1146 // Mips specific dynamic table entry tags.
1147 DT_MIPS_RLD_VERSION = 0x70000001, // 32 bit version number for runtime
1148 // linker interface.
1149 DT_MIPS_TIME_STAMP = 0x70000002, // Time stamp.
1150 DT_MIPS_ICHECKSUM = 0x70000003, // Checksum of external strings
1151 // and common sizes.
1152 DT_MIPS_IVERSION = 0x70000004, // Index of version string
1153 // in string table.
1154 DT_MIPS_FLAGS = 0x70000005, // 32 bits of flags.
1155 DT_MIPS_BASE_ADDRESS = 0x70000006, // Base address of the segment.
1156 DT_MIPS_MSYM = 0x70000007, // Address of .msym section.
1157 DT_MIPS_CONFLICT = 0x70000008, // Address of .conflict section.
1158 DT_MIPS_LIBLIST = 0x70000009, // Address of .liblist section.
1159 DT_MIPS_LOCAL_GOTNO = 0x7000000a, // Number of local global offset
1160 // table entries.
1161 DT_MIPS_CONFLICTNO = 0x7000000b, // Number of entries
1162 // in the .conflict section.
1163 DT_MIPS_LIBLISTNO = 0x70000010, // Number of entries
1164 // in the .liblist section.
1165 DT_MIPS_SYMTABNO = 0x70000011, // Number of entries
1166 // in the .dynsym section.
1167 DT_MIPS_UNREFEXTNO = 0x70000012, // Index of first external dynamic symbol
1168 // not referenced locally.
1169 DT_MIPS_GOTSYM = 0x70000013, // Index of first dynamic symbol
1170 // in global offset table.
1171 DT_MIPS_HIPAGENO = 0x70000014, // Number of page table entries
1172 // in global offset table.
1173 DT_MIPS_RLD_MAP = 0x70000016, // Address of run time loader map,
1174 // used for debugging.
1175 DT_MIPS_DELTA_CLASS = 0x70000017, // Delta C++ class definition.
1176 DT_MIPS_DELTA_CLASS_NO = 0x70000018, // Number of entries
1177 // in DT_MIPS_DELTA_CLASS.
1178 DT_MIPS_DELTA_INSTANCE = 0x70000019, // Delta C++ class instances.
1179 DT_MIPS_DELTA_INSTANCE_NO = 0x7000001A, // Number of entries
1180 // in DT_MIPS_DELTA_INSTANCE.
1181 DT_MIPS_DELTA_RELOC = 0x7000001B, // Delta relocations.
1182 DT_MIPS_DELTA_RELOC_NO = 0x7000001C, // Number of entries
1183 // in DT_MIPS_DELTA_RELOC.
1184 DT_MIPS_DELTA_SYM = 0x7000001D, // Delta symbols that Delta
1185 // relocations refer to.
1186 DT_MIPS_DELTA_SYM_NO = 0x7000001E, // Number of entries
1187 // in DT_MIPS_DELTA_SYM.
1188 DT_MIPS_DELTA_CLASSSYM = 0x70000020, // Delta symbols that hold
1189 // class declarations.
1190 DT_MIPS_DELTA_CLASSSYM_NO = 0x70000021, // Number of entries
1191 // in DT_MIPS_DELTA_CLASSSYM.
1192 DT_MIPS_CXX_FLAGS = 0x70000022, // Flags indicating information
1193 // about C++ flavor.
1194 DT_MIPS_PIXIE_INIT = 0x70000023, // Pixie information.
1195 DT_MIPS_SYMBOL_LIB = 0x70000024, // Address of .MIPS.symlib
1196 DT_MIPS_LOCALPAGE_GOTIDX = 0x70000025, // The GOT index of the first PTE
1197 // for a segment
1198 DT_MIPS_LOCAL_GOTIDX = 0x70000026, // The GOT index of the first PTE
1199 // for a local symbol
1200 DT_MIPS_HIDDEN_GOTIDX = 0x70000027, // The GOT index of the first PTE
1201 // for a hidden symbol
1202 DT_MIPS_PROTECTED_GOTIDX = 0x70000028, // The GOT index of the first PTE
1203 // for a protected symbol
1204 DT_MIPS_OPTIONS = 0x70000029, // Address of `.MIPS.options'.
1205 DT_MIPS_INTERFACE = 0x7000002A, // Address of `.interface'.
1206 DT_MIPS_DYNSTR_ALIGN = 0x7000002B, // Unknown.
1207 DT_MIPS_INTERFACE_SIZE = 0x7000002C, // Size of the .interface section.
1208 DT_MIPS_RLD_TEXT_RESOLVE_ADDR = 0x7000002D, // Size of rld_text_resolve
1209 // function stored in the GOT.
1210 DT_MIPS_PERF_SUFFIX = 0x7000002E, // Default suffix of DSO to be added
1211 // by rld on dlopen() calls.
1212 DT_MIPS_COMPACT_SIZE = 0x7000002F, // Size of compact relocation
1213 // section (O32).
1214 DT_MIPS_GP_VALUE = 0x70000030, // GP value for auxiliary GOTs.
1215 DT_MIPS_AUX_DYNAMIC = 0x70000031, // Address of auxiliary .dynamic.
1216 DT_MIPS_PLTGOT = 0x70000032, // Address of the base of the PLTGOT.
1217 DT_MIPS_RWPLT = 0x70000034, // Points to the base
1218 // of a writable PLT.
1219 DT_MIPS_RLD_MAP_REL = 0x70000035, // Relative offset of run time loader
1220 // map, used for debugging.
1221
1222 // Sun machine-independent extensions.
1223 DT_AUXILIARY = 0x7FFFFFFD, // Shared object to load before self
1224 DT_FILTER = 0x7FFFFFFF // Shared object to get values from
1225 };
1226
1227 // DT_FLAGS values.
1228 enum {
1229 DF_ORIGIN = 0x01, // The object may reference $ORIGIN.
1230 DF_SYMBOLIC = 0x02, // Search the shared lib before searching the exe.
1231 DF_TEXTREL = 0x04, // Relocations may modify a non-writable segment.
1232 DF_BIND_NOW = 0x08, // Process all relocations on load.
1233 DF_STATIC_TLS = 0x10 // Reject attempts to load dynamically.
1234 };
1235
1236 // State flags selectable in the `d_un.d_val' element of the DT_FLAGS_1 entry.
1237 enum {
1238 DF_1_NOW = 0x00000001, // Set RTLD_NOW for this object.
1239 DF_1_GLOBAL = 0x00000002, // Set RTLD_GLOBAL for this object.
1240 DF_1_GROUP = 0x00000004, // Set RTLD_GROUP for this object.
1241 DF_1_NODELETE = 0x00000008, // Set RTLD_NODELETE for this object.
1242 DF_1_LOADFLTR = 0x00000010, // Trigger filtee loading at runtime.
1243 DF_1_INITFIRST = 0x00000020, // Set RTLD_INITFIRST for this object.
1244 DF_1_NOOPEN = 0x00000040, // Set RTLD_NOOPEN for this object.
1245 DF_1_ORIGIN = 0x00000080, // $ORIGIN must be handled.
1246 DF_1_DIRECT = 0x00000100, // Direct binding enabled.
1247 DF_1_TRANS = 0x00000200,
1248 DF_1_INTERPOSE = 0x00000400, // Object is used to interpose.
1249 DF_1_NODEFLIB = 0x00000800, // Ignore default lib search path.
1250 DF_1_NODUMP = 0x00001000, // Object can't be dldump'ed.
1251 DF_1_CONFALT = 0x00002000, // Configuration alternative created.
1252 DF_1_ENDFILTEE = 0x00004000, // Filtee terminates filters search.
1253 DF_1_DISPRELDNE = 0x00008000, // Disp reloc applied at build time.
1254 DF_1_DISPRELPND = 0x00010000, // Disp reloc applied at run-time.
1255 DF_1_NODIRECT = 0x00020000, // Object has no-direct binding.
1256 DF_1_IGNMULDEF = 0x00040000,
1257 DF_1_NOKSYMS = 0x00080000,
1258 DF_1_NOHDR = 0x00100000,
1259 DF_1_EDITED = 0x00200000, // Object is modified after built.
1260 DF_1_NORELOC = 0x00400000,
1261 DF_1_SYMINTPOSE = 0x00800000, // Object has individual interposers.
1262 DF_1_GLOBAUDIT = 0x01000000, // Global auditing required.
1263 DF_1_SINGLETON = 0x02000000 // Singleton symbols are used.
1264 };
1265
1266 // DT_MIPS_FLAGS values.
1267 enum {
1268 RHF_NONE = 0x00000000, // No flags.
1269 RHF_QUICKSTART = 0x00000001, // Uses shortcut pointers.
1270 RHF_NOTPOT = 0x00000002, // Hash size is not a power of two.
1271 RHS_NO_LIBRARY_REPLACEMENT = 0x00000004, // Ignore LD_LIBRARY_PATH.
1272 RHF_NO_MOVE = 0x00000008, // DSO address may not be relocated.
1273 RHF_SGI_ONLY = 0x00000010, // SGI specific features.
1274 RHF_GUARANTEE_INIT = 0x00000020, // Guarantee that .init will finish
1275 // executing before any non-init
1276 // code in DSO is called.
1277 RHF_DELTA_C_PLUS_PLUS = 0x00000040, // Contains Delta C++ code.
1278 RHF_GUARANTEE_START_INIT = 0x00000080, // Guarantee that .init will start
1279 // executing before any non-init
1280 // code in DSO is called.
1281 RHF_PIXIE = 0x00000100, // Generated by pixie.
1282 RHF_DEFAULT_DELAY_LOAD = 0x00000200, // Delay-load DSO by default.
1283 RHF_REQUICKSTART = 0x00000400, // Object may be requickstarted
1284 RHF_REQUICKSTARTED = 0x00000800, // Object has been requickstarted
1285 RHF_CORD = 0x00001000, // Generated by cord.
1286 RHF_NO_UNRES_UNDEF = 0x00002000, // Object contains no unresolved
1287 // undef symbols.
1288 RHF_RLD_ORDER_SAFE = 0x00004000 // Symbol table is in a safe order.
1289 };
1290
1291 // ElfXX_VerDef structure version (GNU versioning)
1292 enum { VER_DEF_NONE = 0, VER_DEF_CURRENT = 1 };
1293
1294 // VerDef Flags (ElfXX_VerDef::vd_flags)
1295 enum { VER_FLG_BASE = 0x1, VER_FLG_WEAK = 0x2, VER_FLG_INFO = 0x4 };
1296
1297 // Special constants for the version table. (SHT_GNU_versym/.gnu.version)
1298 enum {
1299 VER_NDX_LOCAL = 0, // Unversioned local symbol
1300 VER_NDX_GLOBAL = 1, // Unversioned global symbol
1301 VERSYM_VERSION = 0x7fff, // Version Index mask
1302 VERSYM_HIDDEN = 0x8000 // Hidden bit (non-default version)
1303 };
1304
1305 // ElfXX_VerNeed structure version (GNU versioning)
1306 enum { VER_NEED_NONE = 0, VER_NEED_CURRENT = 1 };
1307
1308 // SHT_NOTE section types
1309 enum {
1310 NT_GNU_ABI_TAG = 1,
1311 NT_GNU_HWCAP = 2,
1312 NT_GNU_BUILD_ID = 3,
1313 NT_GNU_GOLD_VERSION = 4,
1314 };
1315
1316 enum {
1317 GNU_ABI_TAG_LINUX = 0,
1318 GNU_ABI_TAG_HURD = 1,
1319 GNU_ABI_TAG_SOLARIS = 2,
1320 GNU_ABI_TAG_FREEBSD = 3,
1321 GNU_ABI_TAG_NETBSD = 4,
1322 GNU_ABI_TAG_SYLLABLE = 5,
1323 GNU_ABI_TAG_NACL = 6,
1324 };
1325
1326 // Compressed section header for ELF32.
1327 struct Elf32_Chdr {
1328 Elf32_Word ch_type;
1329 Elf32_Word ch_size;
1330 Elf32_Word ch_addralign;
1331 };
1332
1333 // Compressed section header for ELF64.
1334 struct Elf64_Chdr {
1335 Elf64_Word ch_type;
1336 Elf64_Word ch_reserved;
1337 Elf64_Xword ch_size;
1338 Elf64_Xword ch_addralign;
1339 };
1340
1341 // Legal values for ch_type field of compressed section header.
1342 enum {
1343 ELFCOMPRESS_ZLIB = 1, // ZLIB/DEFLATE algorithm.
1344 ELFCOMPRESS_LOOS = 0x60000000, // Start of OS-specific.
1345 ELFCOMPRESS_HIOS = 0x6fffffff, // End of OS-specific.
1346 ELFCOMPRESS_LOPROC = 0x70000000, // Start of processor-specific.
1347 ELFCOMPRESS_HIPROC = 0x7fffffff // End of processor-specific.
1348 };
1349
1350 } // end namespace ELF
1351
1352 } // end namespace llvm
1353
1354 #endif
1355