1 // arm.h -- ELF definitions specific to EM_ARM  -*- C++ -*-
2 
3 // Copyright (C) 2009-2016 Free Software Foundation, Inc.
4 // Written by Doug Kwan <dougkwan@google.com>.
5 
6 // This file is part of elfcpp.
7 
8 // This program is free software; you can redistribute it and/or
9 // modify it under the terms of the GNU Library General Public License
10 // as published by the Free Software Foundation; either version 2, or
11 // (at your option) any later version.
12 
13 // In addition to the permissions in the GNU Library General Public
14 // License, the Free Software Foundation gives you unlimited
15 // permission to link the compiled version of this file into
16 // combinations with other programs, and to distribute those
17 // combinations without any restriction coming from the use of this
18 // file.  (The Library Public License restrictions do apply in other
19 // respects; for example, they cover modification of the file, and
20 // distribution when not linked into a combined executable.)
21 
22 // This program is distributed in the hope that it will be useful, but
23 // WITHOUT ANY WARRANTY; without even the implied warranty of
24 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
25 // Library General Public License for more details.
26 
27 // You should have received a copy of the GNU Library General Public
28 // License along with this program; if not, write to the Free Software
29 // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA
30 // 02110-1301, USA.
31 
32 #ifndef ELFCPP_ARM_H
33 #define ELFCPP_ARM_H
34 
35 // The relocation type information is taken from:
36 //
37 //   ELF for the ARM Architecture
38 //   Document number: ARM IHI 0044C, current through ABI release 2.07
39 //   Date of Issue: 10th October, 2008
40 //
41 
42 namespace elfcpp
43 {
44 
45 //
46 // ARM Relocations Codes
47 //
48 
49 // Operation notes:
50 //   S: Address of the symbol.
51 //   A: Addend for relocation.
52 //   P: Address of the place being relocated.
53 //   Pa: Adjusted address of the place being relocated (P & 0xfffffffc)
54 //   T: is 1 if S has type STT_FUNC and the symbol addresses a Thumb
55 //      instruction.Thumb-bit; it is 0 otherwise.
56 //   B(S): Addressing origin of the output segment defining S.
57 //   GOT_ORG: Addressing origin of the Global Offset Table.
58 //   GOT(S): Address of the GOT entry for S.
59 //
60 
61 enum
62 {
63 				// Type		Class	Operation
64 				// ------------------------------
65   R_ARM_NONE = 0,		// Static	Misc
66   R_ARM_PC24 = 1,		// Deprecated	ARM	((S + A) | T) - P
67   R_ARM_ABS32 = 2,		// Static	Data	(S + A) | T
68   R_ARM_REL32 = 3,		// Static	Data	((S + A) | T) - P
69   R_ARM_LDR_PC_G0 = 4,		// Static	ARM	S + A - P
70   R_ARM_ABS16 = 5,		// Static	Data	S + A
71   R_ARM_ABS12 = 6,		// Static	ARM	S + A
72   R_ARM_THM_ABS5 = 7,		// Static	Thumb16	S + A
73   R_ARM_ABS8 = 8,		// Static	Data	S + A
74   R_ARM_SBREL32 = 9,		// Static	Data	((S + A) | T) - B(S)
75   R_ARM_THM_CALL = 10,		// Static	Thumb32	((S + A) | T) - P
76   R_ARM_THM_PC8 = 11,		// Static	Thumb16
77   R_ARM_BREL_ADJ = 12,		// Dynamic	Data	DeltaB(S) + A
78   R_ARM_TLS_DESC = 13,		// Dynamic	Data
79   R_ARM_THM_SWI8 = 14,		// Obsolete
80   R_ARM_XPC25 = 15,		// Obsolete
81   R_ARM_THM_XPC22 = 16,		// Obsolete
82   R_ARM_TLS_DTPMOD32 = 17,	// Dynamic	Data	Module(S)
83   R_ARM_TLS_DTPOFF32 = 18,	// Dynamic	Data	S + A - TLS
84   R_ARM_TLS_TPOFF32 = 19,	// Dynamic	Data	S + A - tp
85   R_ARM_COPY = 20,		// Dynamic	Misc
86   R_ARM_GLOB_DAT = 21,		// Dynamic	Data	(S + A) | T
87   R_ARM_JUMP_SLOT = 22,		// Dynamic	Data	(S + A) | T
88   R_ARM_RELATIVE = 23,		// Dynamic	Data	B(S) + A
89   R_ARM_GOTOFF32 = 24,		// Static	Data	(((S + A) | T) - GOT_ORG
90   R_ARM_BASE_PREL = 25,		// Static	Data	B(S) + A - P
91   R_ARM_GOT_BREL = 26,		// Static	Data	GOT(S) + A - GOT_ORG
92   R_ARM_PLT32 = 27,		// Deprecated	ARM	((S + A) | T) - P
93   R_ARM_CALL = 28,		// Static	ARM	((S + A) | T) - P
94   R_ARM_JUMP24 = 29,		// Static	ARM	((S + A) | T) - P
95   R_ARM_THM_JUMP24 = 30,	// Static	Thumb32	((S + A) | T) - P
96   R_ARM_BASE_ABS = 31,		// Static	Data	B(S) + A
97   R_ARM_ALU_PCREL_7_0 = 32,	// Obsolete
98   R_ARM_ALU_PCREL_15_8 = 33,	// Obsolete
99   R_ARM_ALU_PCREL_23_15 = 34,	// Obsolete
100   R_ARM_LDR_SBREL_11_0_NC = 35,	// Deprecated	ARM	S + A - B(S)
101   R_ARM_ALU_SBREL_19_12_NC = 36,// Deprecated	ARM	S + A - B(S)
102   R_ARM_ALU_SBREL_27_20_CK = 37,// Deprecated	ARM	S + A - B(S)
103   R_ARM_TARGET1 = 38,		// Data		Misc	(S + A) | T or
104 				//			((S + A) | T) - P
105   R_ARM_SBREL31 = 39,		// Deprecated	Data	((S + A) | T) - B(S)
106   R_ARM_V4BX = 40,		// Static	Misc
107   R_ARM_TARGET2 = 41,		// Static	Misc
108   R_ARM_PREL31 = 42,		// Static	Data	((S + A) | T) - P
109   R_ARM_MOVW_ABS_NC = 43,	// Static	ARM	(S + A) | T
110   R_ARM_MOVT_ABS = 44,		// Static	ARM	S + A
111   R_ARM_MOVW_PREL_NC = 45,	// Static	ARM	((S + A) | T) - P
112   R_ARM_MOVT_PREL = 46,		// Static	ARM	S + A - P
113   R_ARM_THM_MOVW_ABS_NC = 47,	// Static	Thumb32	(S + A) | T
114   R_ARM_THM_MOVT_ABS = 48,	// Static	Thumb32	S + A - P
115   R_ARM_THM_MOVW_PREL_NC =  49,	// Static	Thumb32	((S + A) | T) - P
116   R_ARM_THM_MOVT_PREL = 50,	// Static	Thumb32	S + A - P
117   R_ARM_THM_JUMP19 = 51,	// Static	Thumb32	((S + A) | T) - P
118   R_ARM_THM_JUMP6 = 52,		// Static	Thumb16	S + A - P
119   R_ARM_THM_ALU_PREL_11_0 = 53,	// Static	Thumb32	((S + A) | T) - Pa
120   R_ARM_THM_PC12 = 54,		// Static	Thumb32	S + A - Pa
121   R_ARM_ABS32_NOI = 55,		// Static	Data	S + A
122   R_ARM_REL32_NOI = 56,		// Static	Data	S + A - P
123   R_ARM_ALU_PC_G0_NC = 57,	// Static	ARM	((S + A) | T) - P
124   R_ARM_ALU_PC_G0 = 58,		// Static	ARM	((S + A) | T) - P
125   R_ARM_ALU_PC_G1_NC = 59,	// Static	ARM	((S + A) | T) - P
126   R_ARM_ALU_PC_G1 = 60,		// Static	ARM	((S + A) | T) - P
127   R_ARM_ALU_PC_G2 = 61,		// Static	ARM	((S + A) | T) - P
128   R_ARM_LDR_PC_G1 = 62,		// Static	ARM	S + A - P
129   R_ARM_LDR_PC_G2 = 63,		// Static	ARM	S + A - P
130   R_ARM_LDRS_PC_G0 = 64,	// Static	ARM	S + A - P
131   R_ARM_LDRS_PC_G1 = 65,	// Static	ARM	S + A - P
132   R_ARM_LDRS_PC_G2 = 66,	// Static	ARM	S + A - P
133   R_ARM_LDC_PC_G0 = 67,		// Static	ARM	S + A - P
134   R_ARM_LDC_PC_G1 = 68,		// Static	ARM	S + A - P
135   R_ARM_LDC_PC_G2 = 69,		// Static	ARM	S + A - P
136   R_ARM_ALU_SB_G0_NC = 70,	// Static	ARM	((S + A) | T) - B(S)
137   R_ARM_ALU_SB_G0 = 71,		// Static	ARM	((S + A) | T) - B(S)
138   R_ARM_ALU_SB_G1_NC = 72,	// Static	ARM	((S + A) | T) - B(S)
139   R_ARM_ALU_SB_G1 = 73,		// Static	ARM	((S + A) | T) - B(S)
140   R_ARM_ALU_SB_G2 = 74,		// Static	ARM	((S + A) | T) - B(S)
141   R_ARM_LDR_SB_G0 = 75,		// Static	ARM	S + A - B(S)
142   R_ARM_LDR_SB_G1 = 76,		// Static	ARM	S + A - B(S)
143   R_ARM_LDR_SB_G2 = 77,		// Static	ARM	S + A - B(S)
144   R_ARM_LDRS_SB_G0 = 78,	// Static	ARM	S + A - B(S)
145   R_ARM_LDRS_SB_G1 = 79,	// Static	ARM	S + A - B(S)
146   R_ARM_LDRS_SB_G2 = 80,	// Static	ARM	S + A - B(S)
147   R_ARM_LDC_SB_G0 = 81,		// Static	ARM	S + A - B(S)
148   R_ARM_LDC_SB_G1 = 82,		// Static	ARM	S + A - B(S)
149   R_ARM_LDC_SB_G2 = 83,		// Static	ARM	S + A - B(S)
150   R_ARM_MOVW_BREL_NC = 84,	// Static	ARM	((S + A) | T) - B(S)
151   R_ARM_MOVT_BREL = 85,		// Static	ARM	S + A - B(S)
152   R_ARM_MOVW_BREL = 86,		// Static	ARM	((S + A) | T) - B(S)
153   R_ARM_THM_MOVW_BREL_NC = 87,	// Static	Thumb32	((S + A) | T) - B(S)
154   R_ARM_THM_MOVT_BREL = 88,	// Static	Thumb32	S + A - B(S)
155   R_ARM_THM_MOVW_BREL = 89,	// Static	Thumb32	((S + A) | T) - B(S)
156   R_ARM_TLS_GOTDESC = 90,	// Static	Data
157   R_ARM_TLS_CALL = 91,		// Static	ARM
158   R_ARM_TLS_DESCSEQ = 92,	// Static	ARM	TLS relaxation
159   R_ARM_THM_TLS_CALL = 93,	// Static	Thumb32
160   R_ARM_PLT32_ABS =  94,	// Static	Data	PLT(S) + A
161   R_ARM_GOT_ABS =  95,		// Static	Data	GOT(S) + A
162   R_ARM_GOT_PREL = 96,		// Static	Data	GOT(S) + A - P
163   R_ARM_GOT_BREL12 =  97,	// Static	ARM	GOT(S) + A - GOT_ORG
164   R_ARM_GOTOFF12 =  98,		// Static	ARM	S + A - GOT_ROG
165   R_ARM_GOTRELAX =  99,		// Static	Misc
166   R_ARM_GNU_VTENTRY = 100,	// Deprecated	Data
167   R_ARM_GNU_VTINHERIT = 101,	// Deprecated	Data
168   R_ARM_THM_JUMP11 = 102,	// Static	Thumb16	S + A - P
169   R_ARM_THM_JUMP8 = 103,	// Static	Thumb16	S + A - P
170   R_ARM_TLS_GD32 = 104,		// Static	Data	GOT(S) + A - P
171   R_ARM_TLS_LDM32 = 105,	// Static	Data	GOT(S) + A - P
172   R_ARM_TLS_LDO32 = 106,	// Static	Data	S + A - TLS
173   R_ARM_TLS_IE32 = 107,		// Static	Data	GOT(S) + A - P
174   R_ARM_TLS_LE32 = 108,		// Static	Data	S + A - tp
175   R_ARM_TLS_LDO12 = 109,	// Static	ARM	S + A - TLS
176   R_ARM_TLS_LE12 = 110,		// Static	ARM	S + A - tp
177   R_ARM_TLS_IE12GP = 111,	// Static	ARM	GOT(S) + A - GOT_ORG
178   R_ARM_PRIVATE_0 = 112,	// Private (n = 0, 1, ... 15)
179   R_ARM_PRIVATE_1 = 113,
180   R_ARM_PRIVATE_2 = 114,
181   R_ARM_PRIVATE_3 = 115,
182   R_ARM_PRIVATE_4 = 116,
183   R_ARM_PRIVATE_5 = 117,
184   R_ARM_PRIVATE_6 = 118,
185   R_ARM_PRIVATE_7 = 119,
186   R_ARM_PRIVATE_8 = 120,
187   R_ARM_PRIVATE_9 = 121,
188   R_ARM_PRIVATE_10 = 122,
189   R_ARM_PRIVATE_11 = 123,
190   R_ARM_PRIVATE_12 = 124,
191   R_ARM_PRIVATE_13 = 125,
192   R_ARM_PRIVATE_14 = 126,
193   R_ARM_PRIVATE_15 = 127,
194   R_ARM_ME_TOO = 128,		// Obsolete
195   R_ARM_THM_TLS_DESCSEQ16 = 129,// Static	Thumb16
196   R_ARM_THM_TLS_DESCSEQ32 = 130,// Static	Thumb32
197   // 131 - 139			Unallocated
198   // 140 - 159			Dynamic		Reserved for future allocation
199   R_ARM_IRELATIVE = 160,	// Dynamic
200   // 161 - 255			Unallocated
201 };
202 
203 // e_flags values used for ARM.  We only support flags defined in AAELF.
204 
205 enum
206 {
207   EF_ARM_BE8 = 0x00800000,
208 
209   // Mask to extract EABI version, not really a flag value.
210   EF_ARM_EABIMASK = 0xFF000000,
211 
212   EF_ARM_EABI_UNKNOWN = 0x00000000,
213   EF_ARM_EABI_VER1 = 0x01000000,
214   EF_ARM_EABI_VER2 = 0x02000000,
215   EF_ARM_EABI_VER3 = 0x03000000,
216   EF_ARM_EABI_VER4 = 0x04000000,
217   EF_ARM_EABI_VER5 = 0x05000000,
218 };
219 
220 // Extract EABI version from flags.
221 
222 inline Elf_Word
arm_eabi_version(Elf_Word flags)223 arm_eabi_version(Elf_Word flags)
224 { return flags & EF_ARM_EABIMASK; }
225 
226 // EABI_VER5 e_flags values for identifying soft- and hard-float ABI
227 // choice.
228 enum
229 {
230   EF_ARM_ABI_FLOAT_SOFT = 0x200,
231   EF_ARM_ABI_FLOAT_HARD = 0x400,
232 };
233 
234 // Values for the Tag_CPU_arch EABI attribute.
235 enum
236 {
237   TAG_CPU_ARCH_PRE_V4,
238   TAG_CPU_ARCH_V4,
239   TAG_CPU_ARCH_V4T,
240   TAG_CPU_ARCH_V5T,
241   TAG_CPU_ARCH_V5TE,
242   TAG_CPU_ARCH_V5TEJ,
243   TAG_CPU_ARCH_V6,
244   TAG_CPU_ARCH_V6KZ,
245   TAG_CPU_ARCH_V6T2,
246   TAG_CPU_ARCH_V6K,
247   TAG_CPU_ARCH_V7,
248   TAG_CPU_ARCH_V6_M,
249   TAG_CPU_ARCH_V6S_M,
250   TAG_CPU_ARCH_V7E_M,
251   TAG_CPU_ARCH_V8,
252   MAX_TAG_CPU_ARCH = TAG_CPU_ARCH_V8,
253   // Pseudo-architecture to allow objects to be compatible with the subset of
254   // armv4t and armv6-m.  This value should never be stored in object files.
255   TAG_CPU_ARCH_V4T_PLUS_V6_M = (MAX_TAG_CPU_ARCH + 1)
256 };
257 
258 // EABI object attributes.
259 enum
260 {
261   // 0-3 are generic.
262   Tag_CPU_raw_name = 4,
263   Tag_CPU_name = 5,
264   Tag_CPU_arch = 6,
265   Tag_CPU_arch_profile = 7,
266   Tag_ARM_ISA_use = 8,
267   Tag_THUMB_ISA_use = 9,
268   Tag_FP_arch = 10,
269   Tag_WMMX_arch = 11,
270   Tag_Advanced_SIMD_arch = 12,
271   Tag_PCS_config = 13,
272   Tag_ABI_PCS_R9_use = 14,
273   Tag_ABI_PCS_RW_data = 15,
274   Tag_ABI_PCS_RO_data = 16,
275   Tag_ABI_PCS_GOT_use = 17,
276   Tag_ABI_PCS_wchar_t = 18,
277   Tag_ABI_FP_rounding = 19,
278   Tag_ABI_FP_denormal = 20,
279   Tag_ABI_FP_exceptions = 21,
280   Tag_ABI_FP_user_exceptions = 22,
281   Tag_ABI_FP_number_model = 23,
282   Tag_ABI_align_needed = 24,
283   Tag_ABI_align_preserved = 25,
284   Tag_ABI_enum_size = 26,
285   Tag_ABI_HardFP_use = 27,
286   Tag_ABI_VFP_args = 28,
287   Tag_ABI_WMMX_args = 29,
288   Tag_ABI_optimization_goals = 30,
289   Tag_ABI_FP_optimization_goals = 31,
290   // 32 is generic (Tag_compatibility).
291   Tag_undefined33 = 33,
292   Tag_CPU_unaligned_access = 34,
293   Tag_undefined35 = 35,
294   Tag_FP_HP_extension = 36,
295   Tag_undefined37 = 37,
296   Tag_ABI_FP_16bit_format = 38,
297   Tag_undefined39 = 39,
298   Tag_undefined40 = 40,
299   Tag_undefined41 = 41,
300   Tag_MPextension_use = 42,
301   Tag_undefined43 = 43,
302   Tag_DIV_use = 44,
303   Tag_nodefaults = 64,
304   Tag_also_compatible_with = 65,
305   Tag_T2EE_use = 66,
306   Tag_conformance = 67,
307   Tag_Virtualization_use = 68,
308   Tag_undefined69 = 69,
309   Tag_MPextension_use_legacy = 70,
310 
311   // The following tags are legacy names for other tags.
312   Tag_VFP_arch = Tag_FP_arch,
313   Tag_ABI_align8_needed = Tag_ABI_align_needed,
314   Tag_ABI_align8_preserved = Tag_ABI_align_preserved,
315   Tag_VFP_HP_extension = Tag_FP_HP_extension
316 };
317 
318 // Values for Tag_ABI_PCS_R9_use.
319 enum
320 {
321   AEABI_R9_V6 = 0,
322   AEABI_R9_SB = 1,
323   AEABI_R9_TLS = 2,
324   AEABI_R9_unused = 3
325 };
326 
327 // Values for Tag_ABI_PCS_RW_data.
328 enum
329 {
330   AEABI_PCS_RW_data_absolute = 0,
331   AEABI_PCS_RW_data_PCrel = 1,
332   AEABI_PCS_RW_data_SBrel = 2,
333   AEABI_PCS_RW_data_unused = 3
334 };
335 
336 // Values for Tag_ABI_enum_size.
337 enum
338 {
339   AEABI_enum_unused = 0,
340   AEABI_enum_short = 1,
341   AEABI_enum_wide = 2,
342   AEABI_enum_forced_wide = 3
343 };
344 
345 // Values for Tag_ABI_FP_number_model.
346 enum
347 {
348   AEABI_FP_number_model_none = 0,
349   AEABI_FP_number_model_ieee754_number = 1,
350   AEABI_FP_number_model_rtabi = 2,
351   AEABI_FP_number_model_ieee754_all = 3
352 };
353 
354 // Values for Tag_ABI_VFP_args.
355 enum
356 {
357   AEABI_VFP_args_base = 0,
358   AEABI_VFP_args_vfp = 1,
359   AEABI_VFP_args_toolchain = 2,
360   AEABI_VFP_args_compatible = 3
361 };
362 
363 // For Exception Index Table. (Exception handling ABI for the ARM
364 // architectue, Section 5)
365 enum
366 {
367   EXIDX_CANTUNWIND = 1,
368 };
369 
370 } // End namespace elfcpp.
371 
372 #endif // !defined(ELFCPP_ARM_H)
373