1 /* ARM ELF support for BFD. 2 Copyright (C) 1998-2016 Free Software Foundation, Inc. 3 4 This file is part of BFD, the Binary File Descriptor library. 5 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. 10 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. 15 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. */ 19 20 #ifndef _ELF_ARM_H 21 #define _ELF_ARM_H 22 23 #include "elf/reloc-macros.h" 24 25 /* Processor specific flags for the ELF header e_flags field. */ 26 #define EF_ARM_RELEXEC 0x01 27 #define EF_ARM_INTERWORK 0x04 28 #define EF_ARM_APCS_26 0x08 29 #define EF_ARM_APCS_FLOAT 0x10 30 #define EF_ARM_PIC 0x20 31 #define EF_ARM_ALIGN8 0x40 /* 8-bit structure alignment is in use. */ 32 #define EF_ARM_NEW_ABI 0x80 33 #define EF_ARM_OLD_ABI 0x100 34 #define EF_ARM_SOFT_FLOAT 0x200 35 #define EF_ARM_VFP_FLOAT 0x400 36 #define EF_ARM_MAVERICK_FLOAT 0x800 37 38 /* Frame unwind information */ 39 #define PT_ARM_EXIDX (PT_LOPROC + 1) 40 41 /* Other constants defined in the ARM ELF spec. version B-01. */ 42 #define EF_ARM_SYMSARESORTED 0x04 /* NB conflicts with EF_INTERWORK. */ 43 #define EF_ARM_DYNSYMSUSESEGIDX 0x08 /* NB conflicts with EF_APCS26. */ 44 #define EF_ARM_MAPSYMSFIRST 0x10 /* NB conflicts with EF_APCS_FLOAT. */ 45 #define EF_ARM_EABIMASK 0xFF000000 46 47 /* New constants defined in the ARM ELF spec. version XXX. 48 Only valid in conjunction with EF_ARM_EABI_VER5. */ 49 #define EF_ARM_ABI_FLOAT_SOFT 0x200 /* NB conflicts with EF_ARM_SOFT_FLOAT. */ 50 #define EF_ARM_ABI_FLOAT_HARD 0x400 /* NB conflicts with EF_ARM_VFP_FLOAT. */ 51 52 /* Constants defined in AAELF. */ 53 #define EF_ARM_BE8 0x00800000 54 #define EF_ARM_LE8 0x00400000 55 56 #define EF_ARM_EABI_VERSION(flags) ((flags) & EF_ARM_EABIMASK) 57 #define EF_ARM_EABI_UNKNOWN 0x00000000 58 #define EF_ARM_EABI_VER1 0x01000000 59 #define EF_ARM_EABI_VER2 0x02000000 60 #define EF_ARM_EABI_VER3 0x03000000 61 #define EF_ARM_EABI_VER4 0x04000000 62 #define EF_ARM_EABI_VER5 0x05000000 63 64 /* Local aliases for some flags to match names used by COFF port. */ 65 #define F_INTERWORK EF_ARM_INTERWORK 66 #define F_APCS26 EF_ARM_APCS_26 67 #define F_APCS_FLOAT EF_ARM_APCS_FLOAT 68 #define F_PIC EF_ARM_PIC 69 #define F_SOFT_FLOAT EF_ARM_SOFT_FLOAT 70 #define F_VFP_FLOAT EF_ARM_VFP_FLOAT 71 72 /* Additional symbol types for Thumb. */ 73 #define STT_ARM_TFUNC STT_LOPROC /* A Thumb function. */ 74 #define STT_ARM_16BIT STT_HIPROC /* A Thumb label. */ 75 76 /* Additional section types. */ 77 #define SHT_ARM_EXIDX 0x70000001 /* Section holds ARM unwind info. */ 78 #define SHT_ARM_PREEMPTMAP 0x70000002 /* Section pre-emption details. */ 79 #define SHT_ARM_ATTRIBUTES 0x70000003 /* Section holds attributes. */ 80 #define SHT_ARM_DEBUGOVERLAY 0x70000004 /* Section holds overlay debug info. */ 81 #define SHT_ARM_OVERLAYSECTION 0x70000005 /* Section holds GDB and overlay integration info. */ 82 83 /* ARM-specific values for sh_flags. */ 84 #define SHF_ENTRYSECT 0x10000000 /* Section contains an entry point. */ 85 #define SHF_ARM_NOREAD 0x20000000 /* Section contains code that can be place on no read memory area. */ 86 #define SHF_COMDEF 0x80000000 /* Section may be multiply defined in the input to a link step. */ 87 88 /* ARM-specific program header flags. */ 89 #define PF_ARM_SB 0x10000000 /* Segment contains the location addressed by the static base. */ 90 #define PF_ARM_PI 0x20000000 /* Segment is position-independent. */ 91 #define PF_ARM_ABS 0x40000000 /* Segment must be loaded at its base address. */ 92 93 /* Values for the Tag_CPU_arch EABI attribute. */ 94 #define TAG_CPU_ARCH_PRE_V4 0 95 #define TAG_CPU_ARCH_V4 1 96 #define TAG_CPU_ARCH_V4T 2 97 #define TAG_CPU_ARCH_V5T 3 98 #define TAG_CPU_ARCH_V5TE 4 99 #define TAG_CPU_ARCH_V5TEJ 5 100 #define TAG_CPU_ARCH_V6 6 101 #define TAG_CPU_ARCH_V6KZ 7 102 #define TAG_CPU_ARCH_V6T2 8 103 #define TAG_CPU_ARCH_V6K 9 104 #define TAG_CPU_ARCH_V7 10 105 #define TAG_CPU_ARCH_V6_M 11 106 #define TAG_CPU_ARCH_V6S_M 12 107 #define TAG_CPU_ARCH_V7E_M 13 108 #define TAG_CPU_ARCH_V8 14 109 #define TAG_CPU_ARCH_V8M_BASE 16 110 #define TAG_CPU_ARCH_V8M_MAIN 17 111 #define MAX_TAG_CPU_ARCH TAG_CPU_ARCH_V8M_MAIN 112 /* Pseudo-architecture to allow objects to be compatible with the subset of 113 armv4t and armv6-m. This value should never be stored in object files. */ 114 #define TAG_CPU_ARCH_V4T_PLUS_V6_M (MAX_TAG_CPU_ARCH + 1) 115 116 /* Relocation types. */ 117 118 START_RELOC_NUMBERS (elf_arm_reloc_type) 119 /* AAELF official names and numbers. */ 120 RELOC_NUMBER (R_ARM_NONE, 0) 121 RELOC_NUMBER (R_ARM_PC24, 1) /* deprecated */ 122 RELOC_NUMBER (R_ARM_ABS32, 2) 123 RELOC_NUMBER (R_ARM_REL32, 3) 124 RELOC_NUMBER (R_ARM_LDR_PC_G0, 4) 125 RELOC_NUMBER (R_ARM_ABS16, 5) 126 RELOC_NUMBER (R_ARM_ABS12, 6) 127 RELOC_NUMBER (R_ARM_THM_ABS5, 7) 128 RELOC_NUMBER (R_ARM_ABS8, 8) 129 RELOC_NUMBER (R_ARM_SBREL32, 9) 130 RELOC_NUMBER (R_ARM_THM_CALL, 10) 131 RELOC_NUMBER (R_ARM_THM_PC8, 11) 132 RELOC_NUMBER (R_ARM_BREL_ADJ, 12) 133 RELOC_NUMBER (R_ARM_TLS_DESC, 13) 134 RELOC_NUMBER (R_ARM_THM_SWI8, 14) /* obsolete */ 135 RELOC_NUMBER (R_ARM_XPC25, 15) /* obsolete */ 136 RELOC_NUMBER (R_ARM_THM_XPC22, 16) /* obsolete */ 137 RELOC_NUMBER (R_ARM_TLS_DTPMOD32, 17) 138 RELOC_NUMBER (R_ARM_TLS_DTPOFF32, 18) 139 RELOC_NUMBER (R_ARM_TLS_TPOFF32, 19) 140 RELOC_NUMBER (R_ARM_COPY, 20) /* Copy symbol at runtime. */ 141 RELOC_NUMBER (R_ARM_GLOB_DAT, 21) /* Create GOT entry. */ 142 RELOC_NUMBER (R_ARM_JUMP_SLOT, 22) /* Create PLT entry. */ 143 RELOC_NUMBER (R_ARM_RELATIVE, 23) /* Adjust by program base. */ 144 RELOC_NUMBER (R_ARM_GOTOFF32, 24) /* 32 bit offset to GOT. */ 145 RELOC_NUMBER (R_ARM_BASE_PREL, 25) /* 32 bit PC relative offset to GOT. */ 146 RELOC_NUMBER (R_ARM_GOT_BREL, 26) /* 32 bit GOT entry. */ 147 RELOC_NUMBER (R_ARM_PLT32, 27) /* deprecated - 32 bit PLT address. */ 148 RELOC_NUMBER (R_ARM_CALL, 28) 149 RELOC_NUMBER (R_ARM_JUMP24, 29) 150 RELOC_NUMBER (R_ARM_THM_JUMP24, 30) 151 RELOC_NUMBER (R_ARM_BASE_ABS, 31) 152 RELOC_NUMBER (R_ARM_ALU_PCREL7_0, 32) /* obsolete */ 153 RELOC_NUMBER (R_ARM_ALU_PCREL15_8, 33) /* obsolete */ 154 RELOC_NUMBER (R_ARM_ALU_PCREL23_15, 34) /* obsolete */ 155 RELOC_NUMBER (R_ARM_LDR_SBREL_11_0, 35) /* deprecated, should have _NC suffix */ 156 RELOC_NUMBER (R_ARM_ALU_SBREL_19_12, 36) /* deprecated, should have _NC suffix */ 157 RELOC_NUMBER (R_ARM_ALU_SBREL_27_20, 37) /* deprecated, should have _CK suffix */ 158 RELOC_NUMBER (R_ARM_TARGET1, 38) 159 RELOC_NUMBER (R_ARM_SBREL31, 39) /* deprecated */ 160 RELOC_NUMBER (R_ARM_V4BX, 40) 161 RELOC_NUMBER (R_ARM_TARGET2, 41) 162 RELOC_NUMBER (R_ARM_PREL31, 42) 163 RELOC_NUMBER (R_ARM_MOVW_ABS_NC, 43) 164 RELOC_NUMBER (R_ARM_MOVT_ABS, 44) 165 RELOC_NUMBER (R_ARM_MOVW_PREL_NC, 45) 166 RELOC_NUMBER (R_ARM_MOVT_PREL, 46) 167 RELOC_NUMBER (R_ARM_THM_MOVW_ABS_NC, 47) 168 RELOC_NUMBER (R_ARM_THM_MOVT_ABS, 48) 169 RELOC_NUMBER (R_ARM_THM_MOVW_PREL_NC, 49) 170 RELOC_NUMBER (R_ARM_THM_MOVT_PREL, 50) 171 RELOC_NUMBER (R_ARM_THM_JUMP19, 51) 172 RELOC_NUMBER (R_ARM_THM_JUMP6, 52) 173 RELOC_NUMBER (R_ARM_THM_ALU_PREL_11_0, 53) 174 RELOC_NUMBER (R_ARM_THM_PC12, 54) 175 RELOC_NUMBER (R_ARM_ABS32_NOI, 55) 176 RELOC_NUMBER (R_ARM_REL32_NOI, 56) 177 RELOC_NUMBER (R_ARM_ALU_PC_G0_NC, 57) 178 RELOC_NUMBER (R_ARM_ALU_PC_G0, 58) 179 RELOC_NUMBER (R_ARM_ALU_PC_G1_NC, 59) 180 RELOC_NUMBER (R_ARM_ALU_PC_G1, 60) 181 RELOC_NUMBER (R_ARM_ALU_PC_G2, 61) 182 RELOC_NUMBER (R_ARM_LDR_PC_G1, 62) 183 RELOC_NUMBER (R_ARM_LDR_PC_G2, 63) 184 RELOC_NUMBER (R_ARM_LDRS_PC_G0, 64) 185 RELOC_NUMBER (R_ARM_LDRS_PC_G1, 65) 186 RELOC_NUMBER (R_ARM_LDRS_PC_G2, 66) 187 RELOC_NUMBER (R_ARM_LDC_PC_G0, 67) 188 RELOC_NUMBER (R_ARM_LDC_PC_G1, 68) 189 RELOC_NUMBER (R_ARM_LDC_PC_G2, 69) 190 RELOC_NUMBER (R_ARM_ALU_SB_G0_NC, 70) 191 RELOC_NUMBER (R_ARM_ALU_SB_G0, 71) 192 RELOC_NUMBER (R_ARM_ALU_SB_G1_NC, 72) 193 RELOC_NUMBER (R_ARM_ALU_SB_G1, 73) 194 RELOC_NUMBER (R_ARM_ALU_SB_G2, 74) 195 RELOC_NUMBER (R_ARM_LDR_SB_G0, 75) 196 RELOC_NUMBER (R_ARM_LDR_SB_G1, 76) 197 RELOC_NUMBER (R_ARM_LDR_SB_G2, 77) 198 RELOC_NUMBER (R_ARM_LDRS_SB_G0, 78) 199 RELOC_NUMBER (R_ARM_LDRS_SB_G1, 79) 200 RELOC_NUMBER (R_ARM_LDRS_SB_G2, 80) 201 RELOC_NUMBER (R_ARM_LDC_SB_G0, 81) 202 RELOC_NUMBER (R_ARM_LDC_SB_G1, 82) 203 RELOC_NUMBER (R_ARM_LDC_SB_G2, 83) 204 RELOC_NUMBER (R_ARM_MOVW_BREL_NC, 84) 205 RELOC_NUMBER (R_ARM_MOVT_BREL, 85) 206 RELOC_NUMBER (R_ARM_MOVW_BREL, 86) 207 RELOC_NUMBER (R_ARM_THM_MOVW_BREL_NC, 87) 208 RELOC_NUMBER (R_ARM_THM_MOVT_BREL, 88) 209 RELOC_NUMBER (R_ARM_THM_MOVW_BREL, 89) 210 RELOC_NUMBER (R_ARM_TLS_GOTDESC, 90) 211 RELOC_NUMBER (R_ARM_TLS_CALL, 91) 212 RELOC_NUMBER (R_ARM_TLS_DESCSEQ, 92) 213 RELOC_NUMBER (R_ARM_THM_TLS_CALL, 93) 214 RELOC_NUMBER (R_ARM_PLT32_ABS, 94) 215 RELOC_NUMBER (R_ARM_GOT_ABS, 95) 216 RELOC_NUMBER (R_ARM_GOT_PREL, 96) 217 RELOC_NUMBER (R_ARM_GOT_BREL12, 97) 218 RELOC_NUMBER (R_ARM_GOTOFF12, 98) 219 RELOC_NUMBER (R_ARM_GOTRELAX, 99) 220 RELOC_NUMBER (R_ARM_GNU_VTENTRY, 100) /* deprecated - old C++ abi */ 221 RELOC_NUMBER (R_ARM_GNU_VTINHERIT, 101) /* deprecated - old C++ abi */ 222 RELOC_NUMBER (R_ARM_THM_JUMP11, 102) 223 RELOC_NUMBER (R_ARM_THM_JUMP8, 103) 224 RELOC_NUMBER (R_ARM_TLS_GD32, 104) 225 RELOC_NUMBER (R_ARM_TLS_LDM32, 105) 226 RELOC_NUMBER (R_ARM_TLS_LDO32, 106) 227 RELOC_NUMBER (R_ARM_TLS_IE32, 107) 228 RELOC_NUMBER (R_ARM_TLS_LE32, 108) 229 RELOC_NUMBER (R_ARM_TLS_LDO12, 109) 230 RELOC_NUMBER (R_ARM_TLS_LE12, 110) 231 RELOC_NUMBER (R_ARM_TLS_IE12GP, 111) 232 /* 112 - 127 private range */ 233 RELOC_NUMBER (R_ARM_ME_TOO, 128) /* obsolete */ 234 RELOC_NUMBER (R_ARM_THM_TLS_DESCSEQ ,129) 235 236 RELOC_NUMBER (R_ARM_THM_ALU_ABS_G0_NC,132) 237 RELOC_NUMBER (R_ARM_THM_ALU_ABS_G1_NC,133) 238 RELOC_NUMBER (R_ARM_THM_ALU_ABS_G2_NC,134) 239 RELOC_NUMBER (R_ARM_THM_ALU_ABS_G3_NC,135) 240 241 RELOC_NUMBER (R_ARM_IRELATIVE, 160) 242 243 /* Extensions? R=read-only? */ 244 RELOC_NUMBER (R_ARM_RXPC25, 249) 245 RELOC_NUMBER (R_ARM_RSBREL32, 250) 246 RELOC_NUMBER (R_ARM_THM_RPC22, 251) 247 RELOC_NUMBER (R_ARM_RREL32, 252) 248 RELOC_NUMBER (R_ARM_RABS32, 253) 249 RELOC_NUMBER (R_ARM_RPC24, 254) 250 RELOC_NUMBER (R_ARM_RBASE, 255) 251 252 /* Unofficial names for some of the relocs. */ 253 FAKE_RELOC (R_ARM_GOTOFF, R_ARM_GOTOFF32) /* 32 bit offset to GOT. */ 254 FAKE_RELOC (R_ARM_THM_PC22, R_ARM_THM_CALL) 255 FAKE_RELOC (R_ARM_THM_PC11, R_ARM_THM_JUMP11) 256 FAKE_RELOC (R_ARM_THM_PC9, R_ARM_THM_JUMP8) 257 258 /* Relocs with both a different name, and (apparently) different meaning in 259 GNU usage. */ 260 FAKE_RELOC (R_ARM_GOTPC, R_ARM_BASE_PREL) /* 32 bit PC relative offset to GOT. */ 261 FAKE_RELOC (R_ARM_GOT32, R_ARM_GOT_BREL) /* 32 bit GOT entry. */ 262 FAKE_RELOC (R_ARM_ROSEGREL32, R_ARM_SBREL31) /* ??? */ 263 FAKE_RELOC (R_ARM_AMP_VCALL9, R_ARM_BREL_ADJ) /* Thumb-something. Not used. */ 264 265 END_RELOC_NUMBERS (R_ARM_max = 256) 266 267 #ifdef BFD_ARCH_SIZE 268 /* EABI object attributes. */ 269 270 enum 271 { 272 /* 0-3 are generic. */ 273 Tag_CPU_raw_name = 4, 274 Tag_CPU_name, 275 Tag_CPU_arch, 276 Tag_CPU_arch_profile, 277 Tag_ARM_ISA_use, 278 Tag_THUMB_ISA_use, 279 Tag_FP_arch, 280 Tag_WMMX_arch, 281 Tag_Advanced_SIMD_arch, 282 Tag_PCS_config, 283 Tag_ABI_PCS_R9_use, 284 Tag_ABI_PCS_RW_data, 285 Tag_ABI_PCS_RO_data, 286 Tag_ABI_PCS_GOT_use, 287 Tag_ABI_PCS_wchar_t, 288 Tag_ABI_FP_rounding, 289 Tag_ABI_FP_denormal, 290 Tag_ABI_FP_exceptions, 291 Tag_ABI_FP_user_exceptions, 292 Tag_ABI_FP_number_model, 293 Tag_ABI_align_needed, 294 Tag_ABI_align_preserved, 295 Tag_ABI_enum_size, 296 Tag_ABI_HardFP_use, 297 Tag_ABI_VFP_args, 298 Tag_ABI_WMMX_args, 299 Tag_ABI_optimization_goals, 300 Tag_ABI_FP_optimization_goals, 301 /* 32 is generic (Tag_compatibility). */ 302 Tag_undefined33 = 33, 303 Tag_CPU_unaligned_access, 304 Tag_undefined35, 305 Tag_FP_HP_extension, 306 Tag_undefined37, 307 Tag_ABI_FP_16bit_format, 308 Tag_undefined39, 309 Tag_undefined40, 310 Tag_undefined41, 311 Tag_MPextension_use, 312 Tag_undefined_43, 313 Tag_DIV_use, 314 Tag_DSP_extension = 46, 315 Tag_nodefaults = 64, 316 Tag_also_compatible_with, 317 Tag_T2EE_use, 318 Tag_conformance, 319 Tag_Virtualization_use, 320 Tag_undefined69, 321 Tag_MPextension_use_legacy, 322 323 /* The following tags are legacy names for other tags. */ 324 Tag_VFP_arch = Tag_FP_arch, 325 Tag_ABI_align8_needed = Tag_ABI_align_needed, 326 Tag_ABI_align8_preserved = Tag_ABI_align_preserved, 327 Tag_VFP_HP_extension = Tag_FP_HP_extension 328 }; 329 330 /* Values for Tag_ABI_FP_number_model. */ 331 enum 332 { 333 AEABI_FP_number_model_none = 0, 334 AEABI_FP_number_model_ieee754_number = 1, 335 AEABI_FP_number_model_rtabi = 2, 336 AEABI_FP_number_model_ieee754_all = 3 337 }; 338 339 /* Values for Tag_ABI_VFP_args. */ 340 enum 341 { 342 AEABI_VFP_args_base = 0, 343 AEABI_VFP_args_vfp = 1, 344 AEABI_VFP_args_toolchain = 2, 345 AEABI_VFP_args_compatible = 3 346 }; 347 #endif 348 349 /* The name of the note section used to identify arm variants. */ 350 #define ARM_NOTE_SECTION ".note.gnu.arm.ident" 351 352 /* Special section names. */ 353 #define ELF_STRING_ARM_unwind ".ARM.exidx" 354 #define ELF_STRING_ARM_unwind_info ".ARM.extab" 355 #define ELF_STRING_ARM_unwind_once ".gnu.linkonce.armexidx." 356 #define ELF_STRING_ARM_unwind_info_once ".gnu.linkonce.armextab." 357 358 enum arm_st_branch_type { 359 ST_BRANCH_TO_ARM, 360 ST_BRANCH_TO_THUMB, 361 ST_BRANCH_LONG, 362 ST_BRANCH_UNKNOWN, 363 ST_BRANCH_ENUM_SIZE 364 }; 365 366 #define NUM_ENUM_ARM_ST_BRANCH_TYPE_BITS 2 367 #define ENUM_ARM_ST_BRANCH_TYPE_BITMASK \ 368 ((1 << NUM_ENUM_ARM_ST_BRANCH_TYPE_BITS) - 1) 369 370 #define ARM_GET_SYM_BRANCH_TYPE(STI) \ 371 ((enum arm_st_branch_type) ((STI) & ENUM_ARM_ST_BRANCH_TYPE_BITMASK)) 372 #ifdef BFD_ASSERT 373 #define ARM_SET_SYM_BRANCH_TYPE(STI, TYPE) \ 374 do { \ 375 BFD_ASSERT (TYPE <= ST_BRANCH_ENUM_SIZE); \ 376 BFD_ASSERT ((1 << NUM_ENUM_ARM_ST_BRANCH_TYPE_BITS) \ 377 >= ST_BRANCH_ENUM_SIZE); \ 378 (STI) = (((STI) & ~ENUM_ARM_ST_BRANCH_TYPE_BITMASK) \ 379 | ((TYPE) & ENUM_ARM_ST_BRANCH_TYPE_BITMASK)); \ 380 } while (0) 381 #else 382 #define ARM_SET_SYM_BRANCH_TYPE(STI, TYPE) \ 383 (STI) = (((STI) & ~ENUM_ARM_ST_BRANCH_TYPE_BITMASK) \ 384 | ((TYPE) & ENUM_ARM_ST_BRANCH_TYPE_BITMASK)) 385 #endif 386 387 #endif /* _ELF_ARM_H */ 388
