1 /* ARM ELF support for BFD.
2 Copyright (C) 1998-2019 Free Software Foundation, Inc.
4 This file is part of BFD, the Binary File Descriptor library.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software Foundation,
18 Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */
23 #include "elf/reloc-macros.h"
25 /* Processor specific flags for the ELF header e_flags field. */
27 /* Old ABI (ie GNU pre EABI). These are deprecated. */
28 #define EF_ARM_RELEXEC 0x01
29 #define EF_ARM_INTERWORK 0x04
30 #define EF_ARM_APCS_26 0x08
31 #define EF_ARM_APCS_FLOAT 0x10
32 #define EF_ARM_PIC 0x20
33 #define EF_ARM_ALIGN8 0x40 /* 8-bit structure alignment is in use. */
34 #define EF_ARM_NEW_ABI 0x80
35 #define EF_ARM_OLD_ABI 0x100
36 #define EF_ARM_SOFT_FLOAT 0x200
37 #define EF_ARM_VFP_FLOAT 0x400
38 #define EF_ARM_MAVERICK_FLOAT 0x800
40 /* Frame unwind information */
41 #define PT_ARM_EXIDX (PT_LOPROC + 1)
43 /* Old ARM ELF spec. version B-01. Mostly deprecated. */
44 #define EF_ARM_SYMSARESORTED 0x04 /* NB conflicts with EF_INTERWORK. */
45 #define EF_ARM_DYNSYMSUSESEGIDX 0x08 /* NB conflicts with EF_APCS26. */
46 #define EF_ARM_MAPSYMSFIRST 0x10 /* NB conflicts with EF_APCS_FLOAT. */
48 /* New constants defined in the ARM ELF spec. version XXX (AAELF).
49 Only valid in conjunction with EF_ARM_EABI_VER5. */
50 #define EF_ARM_ABI_FLOAT_SOFT 0x200 /* NB conflicts with EF_ARM_SOFT_FLOAT. */
51 #define EF_ARM_ABI_FLOAT_HARD 0x400 /* NB conflicts with EF_ARM_VFP_FLOAT. */
53 /* Constants defined in AAELF. */
54 #define EF_ARM_BE8 0x00800000
55 #define EF_ARM_LE8 0x00400000
57 #define EF_ARM_EABIMASK 0xFF000000
58 #define EF_ARM_EABI_VERSION(flags) ((flags) & EF_ARM_EABIMASK)
59 #define EF_ARM_EABI_UNKNOWN 0x00000000
60 #define EF_ARM_EABI_VER1 0x01000000
61 #define EF_ARM_EABI_VER2 0x02000000
62 #define EF_ARM_EABI_VER3 0x03000000
63 #define EF_ARM_EABI_VER4 0x04000000
64 #define EF_ARM_EABI_VER5 0x05000000
66 /* Local aliases for some flags to match names used by COFF port. */
67 #define F_INTERWORK EF_ARM_INTERWORK
68 #define F_APCS26 EF_ARM_APCS_26
69 #define F_APCS_FLOAT EF_ARM_APCS_FLOAT
70 #define F_PIC EF_ARM_PIC
71 #define F_SOFT_FLOAT EF_ARM_SOFT_FLOAT
72 #define F_VFP_FLOAT EF_ARM_VFP_FLOAT
74 /* Additional symbol types for Thumb. */
75 #define STT_ARM_TFUNC STT_LOPROC /* A Thumb function. */
76 #define STT_ARM_16BIT STT_HIPROC /* A Thumb label. */
78 /* Additional section types. */
79 #define SHT_ARM_EXIDX 0x70000001 /* Section holds ARM unwind info. */
80 #define SHT_ARM_PREEMPTMAP 0x70000002 /* Section pre-emption details. */
81 #define SHT_ARM_ATTRIBUTES 0x70000003 /* Section holds attributes. */
82 #define SHT_ARM_DEBUGOVERLAY 0x70000004 /* Section holds overlay debug info. */
83 #define SHT_ARM_OVERLAYSECTION 0x70000005 /* Section holds GDB and overlay integration info. */
85 /* ARM-specific values for sh_flags. */
86 #define SHF_ENTRYSECT 0x10000000 /* Section contains an entry point. */
87 #define SHF_ARM_PURECODE 0x20000000 /* Section contains only code and no data. */
88 #define SHF_COMDEF 0x80000000 /* Section may be multiply defined in the input to a link step. */
90 /* ARM-specific program header flags. */
91 #define PF_ARM_SB 0x10000000 /* Segment contains the location addressed by the static base. */
92 #define PF_ARM_PI 0x20000000 /* Segment is position-independent. */
93 #define PF_ARM_ABS 0x40000000 /* Segment must be loaded at its base address. */
95 /* Values for the Tag_CPU_arch EABI attribute. */
96 #define TAG_CPU_ARCH_PRE_V4 0
97 #define TAG_CPU_ARCH_V4 1
98 #define TAG_CPU_ARCH_V4T 2
99 #define TAG_CPU_ARCH_V5T 3
100 #define TAG_CPU_ARCH_V5TE 4
101 #define TAG_CPU_ARCH_V5TEJ 5
102 #define TAG_CPU_ARCH_V6 6
103 #define TAG_CPU_ARCH_V6KZ 7
104 #define TAG_CPU_ARCH_V6T2 8
105 #define TAG_CPU_ARCH_V6K 9
106 #define TAG_CPU_ARCH_V7 10
107 #define TAG_CPU_ARCH_V6_M 11
108 #define TAG_CPU_ARCH_V6S_M 12
109 #define TAG_CPU_ARCH_V7E_M 13
110 #define TAG_CPU_ARCH_V8 14
111 #define TAG_CPU_ARCH_V8R 15
112 #define TAG_CPU_ARCH_V8M_BASE 16
113 #define TAG_CPU_ARCH_V8M_MAIN 17
114 #define TAG_CPU_ARCH_V8_1M_MAIN 21
115 #define MAX_TAG_CPU_ARCH TAG_CPU_ARCH_V8_1M_MAIN
116 /* Pseudo-architecture to allow objects to be compatible with the subset of
117 armv4t and armv6-m. This value should never be stored in object files. */
118 #define TAG_CPU_ARCH_V4T_PLUS_V6_M (MAX_TAG_CPU_ARCH + 1)
120 /* Relocation types. */
122 START_RELOC_NUMBERS (elf_arm_reloc_type)
123 /* AAELF official names and numbers. */
124 RELOC_NUMBER (R_ARM_NONE, 0)
125 RELOC_NUMBER (R_ARM_PC24, 1) /* deprecated */
126 RELOC_NUMBER (R_ARM_ABS32, 2)
127 RELOC_NUMBER (R_ARM_REL32, 3)
128 RELOC_NUMBER (R_ARM_LDR_PC_G0, 4)
129 RELOC_NUMBER (R_ARM_ABS16, 5)
130 RELOC_NUMBER (R_ARM_ABS12, 6)
131 RELOC_NUMBER (R_ARM_THM_ABS5, 7)
132 RELOC_NUMBER (R_ARM_ABS8, 8)
133 RELOC_NUMBER (R_ARM_SBREL32, 9)
134 RELOC_NUMBER (R_ARM_THM_CALL, 10)
135 RELOC_NUMBER (R_ARM_THM_PC8, 11)
136 RELOC_NUMBER (R_ARM_BREL_ADJ, 12)
137 RELOC_NUMBER (R_ARM_TLS_DESC, 13)
138 RELOC_NUMBER (R_ARM_THM_SWI8, 14) /* obsolete */
139 RELOC_NUMBER (R_ARM_XPC25, 15) /* obsolete */
140 RELOC_NUMBER (R_ARM_THM_XPC22, 16) /* obsolete */
141 RELOC_NUMBER (R_ARM_TLS_DTPMOD32, 17)
142 RELOC_NUMBER (R_ARM_TLS_DTPOFF32, 18)
143 RELOC_NUMBER (R_ARM_TLS_TPOFF32, 19)
144 RELOC_NUMBER (R_ARM_COPY, 20) /* Copy symbol at runtime. */
145 RELOC_NUMBER (R_ARM_GLOB_DAT, 21) /* Create GOT entry. */
146 RELOC_NUMBER (R_ARM_JUMP_SLOT, 22) /* Create PLT entry. */
147 RELOC_NUMBER (R_ARM_RELATIVE, 23) /* Adjust by program base. */
148 RELOC_NUMBER (R_ARM_GOTOFF32, 24) /* 32 bit offset to GOT. */
149 RELOC_NUMBER (R_ARM_BASE_PREL, 25) /* 32 bit PC relative offset to GOT. */
150 RELOC_NUMBER (R_ARM_GOT_BREL, 26) /* 32 bit GOT entry. */
151 RELOC_NUMBER (R_ARM_PLT32, 27) /* deprecated - 32 bit PLT address. */
152 RELOC_NUMBER (R_ARM_CALL, 28)
153 RELOC_NUMBER (R_ARM_JUMP24, 29)
154 RELOC_NUMBER (R_ARM_THM_JUMP24, 30)
155 RELOC_NUMBER (R_ARM_BASE_ABS, 31)
156 RELOC_NUMBER (R_ARM_ALU_PCREL7_0, 32) /* obsolete */
157 RELOC_NUMBER (R_ARM_ALU_PCREL15_8, 33) /* obsolete */
158 RELOC_NUMBER (R_ARM_ALU_PCREL23_15, 34) /* obsolete */
159 RELOC_NUMBER (R_ARM_LDR_SBREL_11_0, 35) /* deprecated, should have _NC suffix */
160 RELOC_NUMBER (R_ARM_ALU_SBREL_19_12, 36) /* deprecated, should have _NC suffix */
161 RELOC_NUMBER (R_ARM_ALU_SBREL_27_20, 37) /* deprecated, should have _CK suffix */
162 RELOC_NUMBER (R_ARM_TARGET1, 38)
163 RELOC_NUMBER (R_ARM_SBREL31, 39) /* deprecated */
164 RELOC_NUMBER (R_ARM_V4BX, 40)
165 RELOC_NUMBER (R_ARM_TARGET2, 41)
166 RELOC_NUMBER (R_ARM_PREL31, 42)
167 RELOC_NUMBER (R_ARM_MOVW_ABS_NC, 43)
168 RELOC_NUMBER (R_ARM_MOVT_ABS, 44)
169 RELOC_NUMBER (R_ARM_MOVW_PREL_NC, 45)
170 RELOC_NUMBER (R_ARM_MOVT_PREL, 46)
171 RELOC_NUMBER (R_ARM_THM_MOVW_ABS_NC, 47)
172 RELOC_NUMBER (R_ARM_THM_MOVT_ABS, 48)
173 RELOC_NUMBER (R_ARM_THM_MOVW_PREL_NC, 49)
174 RELOC_NUMBER (R_ARM_THM_MOVT_PREL, 50)
175 RELOC_NUMBER (R_ARM_THM_JUMP19, 51)
176 RELOC_NUMBER (R_ARM_THM_JUMP6, 52)
177 RELOC_NUMBER (R_ARM_THM_ALU_PREL_11_0, 53)
178 RELOC_NUMBER (R_ARM_THM_PC12, 54)
179 RELOC_NUMBER (R_ARM_ABS32_NOI, 55)
180 RELOC_NUMBER (R_ARM_REL32_NOI, 56)
181 RELOC_NUMBER (R_ARM_ALU_PC_G0_NC, 57)
182 RELOC_NUMBER (R_ARM_ALU_PC_G0, 58)
183 RELOC_NUMBER (R_ARM_ALU_PC_G1_NC, 59)
184 RELOC_NUMBER (R_ARM_ALU_PC_G1, 60)
185 RELOC_NUMBER (R_ARM_ALU_PC_G2, 61)
186 RELOC_NUMBER (R_ARM_LDR_PC_G1, 62)
187 RELOC_NUMBER (R_ARM_LDR_PC_G2, 63)
188 RELOC_NUMBER (R_ARM_LDRS_PC_G0, 64)
189 RELOC_NUMBER (R_ARM_LDRS_PC_G1, 65)
190 RELOC_NUMBER (R_ARM_LDRS_PC_G2, 66)
191 RELOC_NUMBER (R_ARM_LDC_PC_G0, 67)
192 RELOC_NUMBER (R_ARM_LDC_PC_G1, 68)
193 RELOC_NUMBER (R_ARM_LDC_PC_G2, 69)
194 RELOC_NUMBER (R_ARM_ALU_SB_G0_NC, 70)
195 RELOC_NUMBER (R_ARM_ALU_SB_G0, 71)
196 RELOC_NUMBER (R_ARM_ALU_SB_G1_NC, 72)
197 RELOC_NUMBER (R_ARM_ALU_SB_G1, 73)
198 RELOC_NUMBER (R_ARM_ALU_SB_G2, 74)
199 RELOC_NUMBER (R_ARM_LDR_SB_G0, 75)
200 RELOC_NUMBER (R_ARM_LDR_SB_G1, 76)
201 RELOC_NUMBER (R_ARM_LDR_SB_G2, 77)
202 RELOC_NUMBER (R_ARM_LDRS_SB_G0, 78)
203 RELOC_NUMBER (R_ARM_LDRS_SB_G1, 79)
204 RELOC_NUMBER (R_ARM_LDRS_SB_G2, 80)
205 RELOC_NUMBER (R_ARM_LDC_SB_G0, 81)
206 RELOC_NUMBER (R_ARM_LDC_SB_G1, 82)
207 RELOC_NUMBER (R_ARM_LDC_SB_G2, 83)
208 RELOC_NUMBER (R_ARM_MOVW_BREL_NC, 84)
209 RELOC_NUMBER (R_ARM_MOVT_BREL, 85)
210 RELOC_NUMBER (R_ARM_MOVW_BREL, 86)
211 RELOC_NUMBER (R_ARM_THM_MOVW_BREL_NC, 87)
212 RELOC_NUMBER (R_ARM_THM_MOVT_BREL, 88)
213 RELOC_NUMBER (R_ARM_THM_MOVW_BREL, 89)
214 RELOC_NUMBER (R_ARM_TLS_GOTDESC, 90)
215 RELOC_NUMBER (R_ARM_TLS_CALL, 91)
216 RELOC_NUMBER (R_ARM_TLS_DESCSEQ, 92)
217 RELOC_NUMBER (R_ARM_THM_TLS_CALL, 93)
218 RELOC_NUMBER (R_ARM_PLT32_ABS, 94)
219 RELOC_NUMBER (R_ARM_GOT_ABS, 95)
220 RELOC_NUMBER (R_ARM_GOT_PREL, 96)
221 RELOC_NUMBER (R_ARM_GOT_BREL12, 97)
222 RELOC_NUMBER (R_ARM_GOTOFF12, 98)
223 RELOC_NUMBER (R_ARM_GOTRELAX, 99)
224 RELOC_NUMBER (R_ARM_GNU_VTENTRY, 100) /* deprecated - old C++ abi */
225 RELOC_NUMBER (R_ARM_GNU_VTINHERIT, 101) /* deprecated - old C++ abi */
226 RELOC_NUMBER (R_ARM_THM_JUMP11, 102)
227 RELOC_NUMBER (R_ARM_THM_JUMP8, 103)
228 RELOC_NUMBER (R_ARM_TLS_GD32, 104)
229 RELOC_NUMBER (R_ARM_TLS_LDM32, 105)
230 RELOC_NUMBER (R_ARM_TLS_LDO32, 106)
231 RELOC_NUMBER (R_ARM_TLS_IE32, 107)
232 RELOC_NUMBER (R_ARM_TLS_LE32, 108)
233 RELOC_NUMBER (R_ARM_TLS_LDO12, 109)
234 RELOC_NUMBER (R_ARM_TLS_LE12, 110)
235 RELOC_NUMBER (R_ARM_TLS_IE12GP, 111)
236 /* 112 - 127 private range */
237 RELOC_NUMBER (R_ARM_ME_TOO, 128) /* obsolete */
238 RELOC_NUMBER (R_ARM_THM_TLS_DESCSEQ ,129)
240 RELOC_NUMBER (R_ARM_THM_ALU_ABS_G0_NC,132)
241 RELOC_NUMBER (R_ARM_THM_ALU_ABS_G1_NC,133)
242 RELOC_NUMBER (R_ARM_THM_ALU_ABS_G2_NC,134)
243 RELOC_NUMBER (R_ARM_THM_ALU_ABS_G3_NC,135)
244 RELOC_NUMBER (R_ARM_THM_BF16, 136)
245 RELOC_NUMBER (R_ARM_THM_BF12, 137)
246 RELOC_NUMBER (R_ARM_THM_BF18, 138)
248 RELOC_NUMBER (R_ARM_IRELATIVE, 160)
249 RELOC_NUMBER (R_ARM_GOTFUNCDESC, 161)
250 RELOC_NUMBER (R_ARM_GOTOFFFUNCDESC, 162)
251 RELOC_NUMBER (R_ARM_FUNCDESC, 163)
252 RELOC_NUMBER (R_ARM_FUNCDESC_VALUE, 164)
253 RELOC_NUMBER (R_ARM_TLS_GD32_FDPIC, 165)
254 RELOC_NUMBER (R_ARM_TLS_LDM32_FDPIC, 166)
255 RELOC_NUMBER (R_ARM_TLS_IE32_FDPIC, 167)
257 /* Extensions? R=read-only? */
258 RELOC_NUMBER (R_ARM_RXPC25, 249)
259 RELOC_NUMBER (R_ARM_RSBREL32, 250)
260 RELOC_NUMBER (R_ARM_THM_RPC22, 251)
261 RELOC_NUMBER (R_ARM_RREL32, 252)
262 RELOC_NUMBER (R_ARM_RABS32, 253)
263 RELOC_NUMBER (R_ARM_RPC24, 254)
264 RELOC_NUMBER (R_ARM_RBASE, 255)
266 /* Unofficial names for some of the relocs. */
267 FAKE_RELOC (R_ARM_GOTOFF, R_ARM_GOTOFF32) /* 32 bit offset to GOT. */
268 FAKE_RELOC (R_ARM_THM_PC22, R_ARM_THM_CALL)
269 FAKE_RELOC (R_ARM_THM_PC11, R_ARM_THM_JUMP11)
270 FAKE_RELOC (R_ARM_THM_PC9, R_ARM_THM_JUMP8)
272 /* Relocs with both a different name, and (apparently) different meaning in
274 FAKE_RELOC (R_ARM_GOTPC, R_ARM_BASE_PREL) /* 32 bit PC relative offset to GOT. */
275 FAKE_RELOC (R_ARM_GOT32, R_ARM_GOT_BREL) /* 32 bit GOT entry. */
276 FAKE_RELOC (R_ARM_ROSEGREL32, R_ARM_SBREL31) /* ??? */
277 FAKE_RELOC (R_ARM_AMP_VCALL9, R_ARM_BREL_ADJ) /* Thumb-something. Not used. */
279 END_RELOC_NUMBERS (R_ARM_max = 256)
282 /* EABI object attributes. */
286 /* 0-3 are generic. */
287 Tag_CPU_raw_name = 4,
290 Tag_CPU_arch_profile,
295 Tag_Advanced_SIMD_arch,
304 Tag_ABI_FP_exceptions,
305 Tag_ABI_FP_user_exceptions,
306 Tag_ABI_FP_number_model,
307 Tag_ABI_align_needed,
308 Tag_ABI_align_preserved,
313 Tag_ABI_optimization_goals,
314 Tag_ABI_FP_optimization_goals,
315 /* 32 is generic (Tag_compatibility). */
316 Tag_undefined33 = 33,
317 Tag_CPU_unaligned_access,
321 Tag_ABI_FP_16bit_format,
328 Tag_DSP_extension = 46,
331 Tag_also_compatible_with,
334 Tag_Virtualization_use,
336 Tag_MPextension_use_legacy,
338 /* The following tags are legacy names for other tags. */
339 Tag_VFP_arch = Tag_FP_arch,
340 Tag_ABI_align8_needed = Tag_ABI_align_needed,
341 Tag_ABI_align8_preserved = Tag_ABI_align_preserved,
342 Tag_VFP_HP_extension = Tag_FP_HP_extension
345 /* Values for Tag_ABI_FP_number_model. */
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
354 /* Values for Tag_ABI_VFP_args. */
357 AEABI_VFP_args_base = 0,
358 AEABI_VFP_args_vfp = 1,
359 AEABI_VFP_args_toolchain = 2,
360 AEABI_VFP_args_compatible = 3
364 /* The name of the note section used to identify arm variants. */
365 #define ARM_NOTE_SECTION ".note.gnu.arm.ident"
367 /* Special section names. */
368 #define ELF_STRING_ARM_unwind ".ARM.exidx"
369 #define ELF_STRING_ARM_unwind_info ".ARM.extab"
370 #define ELF_STRING_ARM_unwind_once ".gnu.linkonce.armexidx."
371 #define ELF_STRING_ARM_unwind_info_once ".gnu.linkonce.armextab."
373 enum arm_st_branch_type {
381 #define NUM_ENUM_ARM_ST_BRANCH_TYPE_BITS 2
382 #define ENUM_ARM_ST_BRANCH_TYPE_BITMASK \
383 ((1 << NUM_ENUM_ARM_ST_BRANCH_TYPE_BITS) - 1)
385 #define ARM_GET_SYM_BRANCH_TYPE(STI) \
386 ((enum arm_st_branch_type) ((STI) & ENUM_ARM_ST_BRANCH_TYPE_BITMASK))
388 #define ARM_SET_SYM_BRANCH_TYPE(STI, TYPE) \
390 BFD_ASSERT (TYPE <= ST_BRANCH_ENUM_SIZE); \
391 BFD_ASSERT ((1 << NUM_ENUM_ARM_ST_BRANCH_TYPE_BITS) \
392 >= ST_BRANCH_ENUM_SIZE); \
393 (STI) = (((STI) & ~ENUM_ARM_ST_BRANCH_TYPE_BITMASK) \
394 | ((TYPE) & ENUM_ARM_ST_BRANCH_TYPE_BITMASK)); \
397 #define ARM_SET_SYM_BRANCH_TYPE(STI, TYPE) \
398 (STI) = (((STI) & ~ENUM_ARM_ST_BRANCH_TYPE_BITMASK) \
399 | ((TYPE) & ENUM_ARM_ST_BRANCH_TYPE_BITMASK))
402 #endif /* _ELF_ARM_H */