aboutsummaryrefslogtreecommitdiff
path: root/elfcpp/arm.h
blob: b4cd67f87ce49288ee40adb7653443b493774267 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
// arm.h -- ELF definitions specific to EM_ARM  -*- C++ -*-

// Copyright (C) 2009-2019 Free Software Foundation, Inc.
// Written by Doug Kwan <dougkwan@google.com>.

// This file is part of elfcpp.
   
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU Library General Public License
// as published by the Free Software Foundation; either version 2, or
// (at your option) any later version.

// In addition to the permissions in the GNU Library General Public
// License, the Free Software Foundation gives you unlimited
// permission to link the compiled version of this file into
// combinations with other programs, and to distribute those
// combinations without any restriction coming from the use of this
// file.  (The Library Public License restrictions do apply in other
// respects; for example, they cover modification of the file, and
// distribution when not linked into a combined executable.)

// This program is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Library General Public License for more details.

// You should have received a copy of the GNU Library General Public
// License along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA
// 02110-1301, USA.

#ifndef ELFCPP_ARM_H
#define ELFCPP_ARM_H

// The relocation type information is taken from:
//
//   ELF for the ARM Architecture
//   Document number: ARM IHI 0044C, current through ABI release 2.07
//   Date of Issue: 10th October, 2008
//

namespace elfcpp
{

//
// ARM Relocations Codes
//

// Operation notes: 
//   S: Address of the symbol.
//   A: Addend for relocation.
//   P: Address of the place being relocated.
//   Pa: Adjusted address of the place being relocated (P & 0xfffffffc)
//   T: is 1 if S has type STT_FUNC and the symbol addresses a Thumb
//      instruction.Thumb-bit; it is 0 otherwise.
//   B(S): Addressing origin of the output segment defining S.
//   GOT_ORG: Addressing origin of the Global Offset Table.
//   GOT(S): Address of the GOT entry for S.
//

enum
{
				// Type		Class	Operation		
				// ------------------------------
  R_ARM_NONE = 0,		// Static	Misc
  R_ARM_PC24 = 1,		// Deprecated	ARM	((S + A) | T) - P
  R_ARM_ABS32 = 2,		// Static	Data	(S + A) | T
  R_ARM_REL32 = 3,		// Static	Data	((S + A) | T) - P
  R_ARM_LDR_PC_G0 = 4,		// Static	ARM	S + A - P
  R_ARM_ABS16 = 5,		// Static	Data	S + A
  R_ARM_ABS12 = 6,		// Static	ARM	S + A
  R_ARM_THM_ABS5 = 7,		// Static	Thumb16	S + A
  R_ARM_ABS8 = 8,		// Static	Data	S + A
  R_ARM_SBREL32 = 9,		// Static	Data	((S + A) | T) - B(S)
  R_ARM_THM_CALL = 10,		// Static	Thumb32	((S + A) | T) - P
  R_ARM_THM_PC8 = 11,		// Static	Thumb16
  R_ARM_BREL_ADJ = 12,		// Dynamic	Data	DeltaB(S) + A
  R_ARM_TLS_DESC = 13,		// Dynamic	Data
  R_ARM_THM_SWI8 = 14,		// Obsolete
  R_ARM_XPC25 = 15,		// Obsolete
  R_ARM_THM_XPC22 = 16,		// Obsolete
  R_ARM_TLS_DTPMOD32 = 17,	// Dynamic	Data	Module(S)
  R_ARM_TLS_DTPOFF32 = 18,	// Dynamic	Data	S + A - TLS
  R_ARM_TLS_TPOFF32 = 19,	// Dynamic	Data	S + A - tp
  R_ARM_COPY = 20,		// Dynamic	Misc
  R_ARM_GLOB_DAT = 21,		// Dynamic	Data	(S + A) | T
  R_ARM_JUMP_SLOT = 22,		// Dynamic	Data	(S + A) | T
  R_ARM_RELATIVE = 23,		// Dynamic	Data	B(S) + A
  R_ARM_GOTOFF32 = 24,		// Static	Data	(((S + A) | T) - GOT_ORG
  R_ARM_BASE_PREL = 25,		// Static	Data	B(S) + A - P
  R_ARM_GOT_BREL = 26,		// Static	Data	GOT(S) + A - GOT_ORG
  R_ARM_PLT32 = 27,		// Deprecated	ARM	((S + A) | T) - P
  R_ARM_CALL = 28,		// Static	ARM	((S + A) | T) - P
  R_ARM_JUMP24 = 29,		// Static	ARM	((S + A) | T) - P
  R_ARM_THM_JUMP24 = 30,	// Static	Thumb32	((S + A) | T) - P
  R_ARM_BASE_ABS = 31,		// Static	Data	B(S) + A
  R_ARM_ALU_PCREL_7_0 = 32,	// Obsolete
  R_ARM_ALU_PCREL_15_8 = 33,	// Obsolete
  R_ARM_ALU_PCREL_23_15 = 34,	// Obsolete
  R_ARM_LDR_SBREL_11_0_NC = 35,	// Deprecated	ARM	S + A - B(S)
  R_ARM_ALU_SBREL_19_12_NC = 36,// Deprecated	ARM	S + A - B(S)
  R_ARM_ALU_SBREL_27_20_CK = 37,// Deprecated	ARM	S + A - B(S)
  R_ARM_TARGET1 = 38,		// Data		Misc	(S + A) | T or
				//			((S + A) | T) - P
  R_ARM_SBREL31 = 39,		// Deprecated	Data	((S + A) | T) - B(S)
  R_ARM_V4BX = 40,		// Static	Misc 
  R_ARM_TARGET2 = 41,		// Static	Misc
  R_ARM_PREL31 = 42,		// Static	Data	((S + A) | T) - P
  R_ARM_MOVW_ABS_NC = 43,	// Static	ARM	(S + A) | T
  R_ARM_MOVT_ABS = 44,		// Static	ARM	S + A
  R_ARM_MOVW_PREL_NC = 45,	// Static	ARM	((S + A) | T) - P
  R_ARM_MOVT_PREL = 46,		// Static	ARM	S + A - P
  R_ARM_THM_MOVW_ABS_NC = 47,	// Static	Thumb32	(S + A) | T
  R_ARM_THM_MOVT_ABS = 48,	// Static	Thumb32	S + A - P
  R_ARM_THM_MOVW_PREL_NC =  49,	// Static	Thumb32	((S + A) | T) - P
  R_ARM_THM_MOVT_PREL = 50,	// Static	Thumb32	S + A - P
  R_ARM_THM_JUMP19 = 51,	// Static	Thumb32	((S + A) | T) - P
  R_ARM_THM_JUMP6 = 52,		// Static	Thumb16	S + A - P
  R_ARM_THM_ALU_PREL_11_0 = 53,	// Static	Thumb32	((S + A) | T) - Pa
  R_ARM_THM_PC12 = 54,		// Static	Thumb32	S + A - Pa
  R_ARM_ABS32_NOI = 55,		// Static	Data	S + A
  R_ARM_REL32_NOI = 56,		// Static	Data	S + A - P
  R_ARM_ALU_PC_G0_NC = 57,	// Static	ARM	((S + A) | T) - P
  R_ARM_ALU_PC_G0 = 58,		// Static	ARM	((S + A) | T) - P
  R_ARM_ALU_PC_G1_NC = 59,	// Static	ARM	((S + A) | T) - P
  R_ARM_ALU_PC_G1 = 60,		// Static	ARM	((S + A) | T) - P
  R_ARM_ALU_PC_G2 = 61,		// Static	ARM	((S + A) | T) - P
  R_ARM_LDR_PC_G1 = 62,		// Static	ARM	S + A - P
  R_ARM_LDR_PC_G2 = 63,		// Static	ARM	S + A - P
  R_ARM_LDRS_PC_G0 = 64,	// Static	ARM	S + A - P
  R_ARM_LDRS_PC_G1 = 65,	// Static	ARM	S + A - P
  R_ARM_LDRS_PC_G2 = 66,	// Static	ARM	S + A - P
  R_ARM_LDC_PC_G0 = 67,		// Static	ARM	S + A - P
  R_ARM_LDC_PC_G1 = 68,		// Static	ARM	S + A - P
  R_ARM_LDC_PC_G2 = 69,		// Static	ARM	S + A - P
  R_ARM_ALU_SB_G0_NC = 70,	// Static	ARM	((S + A) | T) - B(S)
  R_ARM_ALU_SB_G0 = 71,		// Static	ARM	((S + A) | T) - B(S)
  R_ARM_ALU_SB_G1_NC = 72,	// Static	ARM	((S + A) | T) - B(S)
  R_ARM_ALU_SB_G1 = 73,		// Static	ARM	((S + A) | T) - B(S)
  R_ARM_ALU_SB_G2 = 74,		// Static	ARM	((S + A) | T) - B(S)
  R_ARM_LDR_SB_G0 = 75,		// Static	ARM	S + A - B(S)
  R_ARM_LDR_SB_G1 = 76,		// Static	ARM	S + A - B(S)
  R_ARM_LDR_SB_G2 = 77,		// Static	ARM	S + A - B(S)
  R_ARM_LDRS_SB_G0 = 78,	// Static	ARM	S + A - B(S)
  R_ARM_LDRS_SB_G1 = 79,	// Static	ARM	S + A - B(S)
  R_ARM_LDRS_SB_G2 = 80,	// Static	ARM	S + A - B(S)
  R_ARM_LDC_SB_G0 = 81,		// Static	ARM	S + A - B(S)
  R_ARM_LDC_SB_G1 = 82,		// Static	ARM	S + A - B(S)
  R_ARM_LDC_SB_G2 = 83,		// Static	ARM	S + A - B(S)
  R_ARM_MOVW_BREL_NC = 84,	// Static	ARM	((S + A) | T) - B(S)
  R_ARM_MOVT_BREL = 85,		// Static	ARM	S + A - B(S)
  R_ARM_MOVW_BREL = 86,		// Static	ARM	((S + A) | T) - B(S)
  R_ARM_THM_MOVW_BREL_NC = 87,	// Static	Thumb32	((S + A) | T) - B(S)
  R_ARM_THM_MOVT_BREL = 88,	// Static	Thumb32	S + A - B(S)
  R_ARM_THM_MOVW_BREL = 89,	// Static	Thumb32	((S + A) | T) - B(S)
  R_ARM_TLS_GOTDESC = 90,	// Static	Data
  R_ARM_TLS_CALL = 91,		// Static	ARM
  R_ARM_TLS_DESCSEQ = 92,	// Static	ARM	TLS relaxation
  R_ARM_THM_TLS_CALL = 93,	// Static	Thumb32
  R_ARM_PLT32_ABS =  94,	// Static	Data	PLT(S) + A
  R_ARM_GOT_ABS =  95,		// Static	Data	GOT(S) + A
  R_ARM_GOT_PREL = 96,		// Static	Data	GOT(S) + A - P
  R_ARM_GOT_BREL12 =  97,	// Static	ARM	GOT(S) + A - GOT_ORG
  R_ARM_GOTOFF12 =  98,		// Static	ARM	S + A - GOT_ROG
  R_ARM_GOTRELAX =  99,		// Static	Misc
  R_ARM_GNU_VTENTRY = 100,	// Deprecated	Data
  R_ARM_GNU_VTINHERIT = 101,	// Deprecated	Data
  R_ARM_THM_JUMP11 = 102,	// Static	Thumb16	S + A - P
  R_ARM_THM_JUMP8 = 103,	// Static	Thumb16	S + A - P
  R_ARM_TLS_GD32 = 104,		// Static	Data	GOT(S) + A - P
  R_ARM_TLS_LDM32 = 105,	// Static	Data	GOT(S) + A - P
  R_ARM_TLS_LDO32 = 106,	// Static	Data	S + A - TLS
  R_ARM_TLS_IE32 = 107,		// Static	Data	GOT(S) + A - P
  R_ARM_TLS_LE32 = 108,		// Static	Data	S + A - tp
  R_ARM_TLS_LDO12 = 109,	// Static	ARM	S + A - TLS
  R_ARM_TLS_LE12 = 110,		// Static	ARM	S + A - tp
  R_ARM_TLS_IE12GP = 111,	// Static	ARM	GOT(S) + A - GOT_ORG
  R_ARM_PRIVATE_0 = 112,	// Private (n = 0, 1, ... 15)
  R_ARM_PRIVATE_1 = 113,
  R_ARM_PRIVATE_2 = 114,
  R_ARM_PRIVATE_3 = 115,
  R_ARM_PRIVATE_4 = 116,
  R_ARM_PRIVATE_5 = 117,
  R_ARM_PRIVATE_6 = 118,
  R_ARM_PRIVATE_7 = 119,
  R_ARM_PRIVATE_8 = 120,
  R_ARM_PRIVATE_9 = 121,
  R_ARM_PRIVATE_10 = 122,
  R_ARM_PRIVATE_11 = 123,
  R_ARM_PRIVATE_12 = 124,
  R_ARM_PRIVATE_13 = 125,
  R_ARM_PRIVATE_14 = 126,
  R_ARM_PRIVATE_15 = 127,
  R_ARM_ME_TOO = 128,		// Obsolete
  R_ARM_THM_TLS_DESCSEQ16 = 129,// Static	Thumb16
  R_ARM_THM_TLS_DESCSEQ32 = 130,// Static	Thumb32
  // 131 - 135			Unallocated
  // Relocations for Armv8.1-M Mainline (BF/BFL)
  R_ARM_THM_BF16 = 136,		// Static       Thumb32 ((S + A) | T) – P
  // 139			Unallocated
  // 140 - 159			Dynamic		Reserved for future allocation
  R_ARM_IRELATIVE = 160,	// Dynamic
  // 161 - 255			Unallocated
};

// e_flags values used for ARM.  We only support flags defined in AAELF.

enum
{
  EF_ARM_BE8 = 0x00800000,

  // Mask to extract EABI version, not really a flag value.
  EF_ARM_EABIMASK = 0xFF000000,

  EF_ARM_EABI_UNKNOWN = 0x00000000,
  EF_ARM_EABI_VER1 = 0x01000000,
  EF_ARM_EABI_VER2 = 0x02000000,
  EF_ARM_EABI_VER3 = 0x03000000,
  EF_ARM_EABI_VER4 = 0x04000000,
  EF_ARM_EABI_VER5 = 0x05000000,
};

// Extract EABI version from flags.

inline Elf_Word
arm_eabi_version(Elf_Word flags)
{ return flags & EF_ARM_EABIMASK; }

// EABI_VER5 e_flags values for identifying soft- and hard-float ABI
// choice.
enum
{
  EF_ARM_ABI_FLOAT_SOFT = 0x200,
  EF_ARM_ABI_FLOAT_HARD = 0x400,
};

// Values for the Tag_CPU_arch EABI attribute.
enum
{
  TAG_CPU_ARCH_PRE_V4,
  TAG_CPU_ARCH_V4,
  TAG_CPU_ARCH_V4T,
  TAG_CPU_ARCH_V5T,
  TAG_CPU_ARCH_V5TE,
  TAG_CPU_ARCH_V5TEJ,
  TAG_CPU_ARCH_V6,
  TAG_CPU_ARCH_V6KZ,
  TAG_CPU_ARCH_V6T2,
  TAG_CPU_ARCH_V6K,
  TAG_CPU_ARCH_V7,
  TAG_CPU_ARCH_V6_M,
  TAG_CPU_ARCH_V6S_M,
  TAG_CPU_ARCH_V7E_M,
  TAG_CPU_ARCH_V8,
  MAX_TAG_CPU_ARCH = TAG_CPU_ARCH_V8,
  // Pseudo-architecture to allow objects to be compatible with the subset of
  // armv4t and armv6-m.  This value should never be stored in object files.
  TAG_CPU_ARCH_V4T_PLUS_V6_M = (MAX_TAG_CPU_ARCH + 1)
};

// EABI object attributes.
enum
{
  // 0-3 are generic.
  Tag_CPU_raw_name = 4,
  Tag_CPU_name = 5,
  Tag_CPU_arch = 6,
  Tag_CPU_arch_profile = 7,
  Tag_ARM_ISA_use = 8,
  Tag_THUMB_ISA_use = 9,
  Tag_FP_arch = 10,
  Tag_WMMX_arch = 11,
  Tag_Advanced_SIMD_arch = 12,
  Tag_PCS_config = 13,
  Tag_ABI_PCS_R9_use = 14,
  Tag_ABI_PCS_RW_data = 15,
  Tag_ABI_PCS_RO_data = 16,
  Tag_ABI_PCS_GOT_use = 17,
  Tag_ABI_PCS_wchar_t = 18,
  Tag_ABI_FP_rounding = 19,
  Tag_ABI_FP_denormal = 20,
  Tag_ABI_FP_exceptions = 21,
  Tag_ABI_FP_user_exceptions = 22,
  Tag_ABI_FP_number_model = 23,
  Tag_ABI_align_needed = 24,
  Tag_ABI_align_preserved = 25,
  Tag_ABI_enum_size = 26,
  Tag_ABI_HardFP_use = 27,
  Tag_ABI_VFP_args = 28,
  Tag_ABI_WMMX_args = 29,
  Tag_ABI_optimization_goals = 30,
  Tag_ABI_FP_optimization_goals = 31,
  // 32 is generic (Tag_compatibility).
  Tag_undefined33 = 33,
  Tag_CPU_unaligned_access = 34,
  Tag_undefined35 = 35,
  Tag_FP_HP_extension = 36,
  Tag_undefined37 = 37,
  Tag_ABI_FP_16bit_format = 38,
  Tag_undefined39 = 39,
  Tag_undefined40 = 40,
  Tag_undefined41 = 41,
  Tag_MPextension_use = 42,
  Tag_undefined43 = 43,
  Tag_DIV_use = 44,
  Tag_nodefaults = 64,
  Tag_also_compatible_with = 65,
  Tag_T2EE_use = 66,
  Tag_conformance = 67,
  Tag_Virtualization_use = 68,
  Tag_undefined69 = 69,
  Tag_MPextension_use_legacy = 70,

  // The following tags are legacy names for other tags.
  Tag_VFP_arch = Tag_FP_arch,
  Tag_ABI_align8_needed = Tag_ABI_align_needed,
  Tag_ABI_align8_preserved = Tag_ABI_align_preserved,
  Tag_VFP_HP_extension = Tag_FP_HP_extension
};

// Values for Tag_ABI_PCS_R9_use.
enum
{
  AEABI_R9_V6 = 0,
  AEABI_R9_SB = 1,
  AEABI_R9_TLS = 2,
  AEABI_R9_unused = 3
};

// Values for Tag_ABI_PCS_RW_data.
enum
{
  AEABI_PCS_RW_data_absolute = 0,
  AEABI_PCS_RW_data_PCrel = 1,
  AEABI_PCS_RW_data_SBrel = 2,
  AEABI_PCS_RW_data_unused = 3
};

// Values for Tag_ABI_enum_size.
enum
{
  AEABI_enum_unused = 0,
  AEABI_enum_short = 1,
  AEABI_enum_wide = 2,
  AEABI_enum_forced_wide = 3
};

// Values for Tag_ABI_FP_number_model.
enum
{
  AEABI_FP_number_model_none = 0,
  AEABI_FP_number_model_ieee754_number = 1,
  AEABI_FP_number_model_rtabi = 2,
  AEABI_FP_number_model_ieee754_all = 3
};

// Values for Tag_ABI_VFP_args.
enum
{
  AEABI_VFP_args_base = 0,
  AEABI_VFP_args_vfp = 1,
  AEABI_VFP_args_toolchain = 2,
  AEABI_VFP_args_compatible = 3
};

// For Exception Index Table. (Exception handling ABI for the ARM
// architectue, Section 5)
enum
{
  EXIDX_CANTUNWIND = 1,
};

} // End namespace elfcpp.

#endif // !defined(ELFCPP_ARM_H)