include/elf/arm.h

   1 /* ARM ELF support for BFD.
   2    Copyright (C) 1998-2015 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 MAX_TAG_CPU_ARCH        14
 110 /* Pseudo-architecture to allow objects to be compatible with the subset of
 111    armv4t and armv6-m.  This value should never be stored in object files.  */
 112 #define TAG_CPU_ARCH_V4T_PLUS_V6_M (MAX_TAG_CPU_ARCH + 1)
 113
 114 /* Relocation types.  */
 115
 116 START_RELOC_NUMBERS (elf_arm_reloc_type)
 117 /* AAELF official names and numbers.  */
 118   RELOC_NUMBER (R_ARM_NONE,               0)
 119   RELOC_NUMBER (R_ARM_PC24,               1)   /* deprecated */
 120   RELOC_NUMBER (R_ARM_ABS32,              2)
 121   RELOC_NUMBER (R_ARM_REL32,              3)
 122   RELOC_NUMBER (R_ARM_LDR_PC_G0,          4)
 123   RELOC_NUMBER (R_ARM_ABS16,              5)
 124   RELOC_NUMBER (R_ARM_ABS12,              6)
 125   RELOC_NUMBER (R_ARM_THM_ABS5,           7)
 126   RELOC_NUMBER (R_ARM_ABS8,               8)
 127   RELOC_NUMBER (R_ARM_SBREL32,            9)
 128   RELOC_NUMBER (R_ARM_THM_CALL,          10)
 129   RELOC_NUMBER (R_ARM_THM_PC8,           11)
 130   RELOC_NUMBER (R_ARM_BREL_ADJ,          12)
 131   RELOC_NUMBER (R_ARM_TLS_DESC,          13)
 132   RELOC_NUMBER (R_ARM_THM_SWI8,          14)   /* obsolete */
 133   RELOC_NUMBER (R_ARM_XPC25,             15)   /* obsolete */
 134   RELOC_NUMBER (R_ARM_THM_XPC22,         16)   /* obsolete */
 135   RELOC_NUMBER (R_ARM_TLS_DTPMOD32,      17)
 136   RELOC_NUMBER (R_ARM_TLS_DTPOFF32,      18)
 137   RELOC_NUMBER (R_ARM_TLS_TPOFF32,       19)
 138   RELOC_NUMBER (R_ARM_COPY,              20)   /* Copy symbol at runtime.  */
 139   RELOC_NUMBER (R_ARM_GLOB_DAT,          21)   /* Create GOT entry.  */
 140   RELOC_NUMBER (R_ARM_JUMP_SLOT,         22)   /* Create PLT entry.  */
 141   RELOC_NUMBER (R_ARM_RELATIVE,          23)   /* Adjust by program base.  */
 142   RELOC_NUMBER (R_ARM_GOTOFF32,          24)   /* 32 bit offset to GOT.  */
 143   RELOC_NUMBER (R_ARM_BASE_PREL,         25)   /* 32 bit PC relative offset to GOT.  */
 144   RELOC_NUMBER (R_ARM_GOT_BREL,          26)   /* 32 bit GOT entry.  */
 145   RELOC_NUMBER (R_ARM_PLT32,             27)   /* deprecated - 32 bit PLT address.  */
 146   RELOC_NUMBER (R_ARM_CALL,              28)
 147   RELOC_NUMBER (R_ARM_JUMP24,            29)
 148   RELOC_NUMBER (R_ARM_THM_JUMP24,        30)
 149   RELOC_NUMBER (R_ARM_BASE_ABS,          31)
 150   RELOC_NUMBER (R_ARM_ALU_PCREL7_0,      32)   /* obsolete */
 151   RELOC_NUMBER (R_ARM_ALU_PCREL15_8,     33)   /* obsolete */
 152   RELOC_NUMBER (R_ARM_ALU_PCREL23_15,    34)   /* obsolete */
 153   RELOC_NUMBER (R_ARM_LDR_SBREL_11_0,    35)   /* deprecated, should have _NC suffix */
 154   RELOC_NUMBER (R_ARM_ALU_SBREL_19_12,   36)   /* deprecated, should have _NC suffix */
 155   RELOC_NUMBER (R_ARM_ALU_SBREL_27_20,   37)   /* deprecated, should have _CK suffix */
 156   RELOC_NUMBER (R_ARM_TARGET1,           38)
 157   RELOC_NUMBER (R_ARM_SBREL31,           39)   /* deprecated */
 158   RELOC_NUMBER (R_ARM_V4BX,              40)
 159   RELOC_NUMBER (R_ARM_TARGET2,           41)
 160   RELOC_NUMBER (R_ARM_PREL31,            42)
 161   RELOC_NUMBER (R_ARM_MOVW_ABS_NC,       43)
 162   RELOC_NUMBER (R_ARM_MOVT_ABS,          44)
 163   RELOC_NUMBER (R_ARM_MOVW_PREL_NC,      45)
 164   RELOC_NUMBER (R_ARM_MOVT_PREL,         46)
 165   RELOC_NUMBER (R_ARM_THM_MOVW_ABS_NC,   47)
 166   RELOC_NUMBER (R_ARM_THM_MOVT_ABS,      48)
 167   RELOC_NUMBER (R_ARM_THM_MOVW_PREL_NC,  49)
 168   RELOC_NUMBER (R_ARM_THM_MOVT_PREL,     50)
 169   RELOC_NUMBER (R_ARM_THM_JUMP19,        51)
 170   RELOC_NUMBER (R_ARM_THM_JUMP6,         52)
 171   RELOC_NUMBER (R_ARM_THM_ALU_PREL_11_0, 53)
 172   RELOC_NUMBER (R_ARM_THM_PC12,          54)
 173   RELOC_NUMBER (R_ARM_ABS32_NOI,         55)
 174   RELOC_NUMBER (R_ARM_REL32_NOI,         56)
 175   RELOC_NUMBER (R_ARM_ALU_PC_G0_NC,      57)
 176   RELOC_NUMBER (R_ARM_ALU_PC_G0,         58)
 177   RELOC_NUMBER (R_ARM_ALU_PC_G1_NC,      59)
 178   RELOC_NUMBER (R_ARM_ALU_PC_G1,         60)
 179   RELOC_NUMBER (R_ARM_ALU_PC_G2,         61)
 180   RELOC_NUMBER (R_ARM_LDR_PC_G1,         62)
 181   RELOC_NUMBER (R_ARM_LDR_PC_G2,         63)
 182   RELOC_NUMBER (R_ARM_LDRS_PC_G0,        64)
 183   RELOC_NUMBER (R_ARM_LDRS_PC_G1,        65)
 184   RELOC_NUMBER (R_ARM_LDRS_PC_G2,        66)
 185   RELOC_NUMBER (R_ARM_LDC_PC_G0,         67)
 186   RELOC_NUMBER (R_ARM_LDC_PC_G1,         68)
 187   RELOC_NUMBER (R_ARM_LDC_PC_G2,         69)
 188   RELOC_NUMBER (R_ARM_ALU_SB_G0_NC,      70)
 189   RELOC_NUMBER (R_ARM_ALU_SB_G0,         71)
 190   RELOC_NUMBER (R_ARM_ALU_SB_G1_NC,      72)
 191   RELOC_NUMBER (R_ARM_ALU_SB_G1,         73)
 192   RELOC_NUMBER (R_ARM_ALU_SB_G2,         74)
 193   RELOC_NUMBER (R_ARM_LDR_SB_G0,         75)
 194   RELOC_NUMBER (R_ARM_LDR_SB_G1,         76)
 195   RELOC_NUMBER (R_ARM_LDR_SB_G2,         77)
 196   RELOC_NUMBER (R_ARM_LDRS_SB_G0,        78)
 197   RELOC_NUMBER (R_ARM_LDRS_SB_G1,        79)
 198   RELOC_NUMBER (R_ARM_LDRS_SB_G2,        80)
 199   RELOC_NUMBER (R_ARM_LDC_SB_G0,         81)
 200   RELOC_NUMBER (R_ARM_LDC_SB_G1,         82)
 201   RELOC_NUMBER (R_ARM_LDC_SB_G2,         83)
 202   RELOC_NUMBER (R_ARM_MOVW_BREL_NC,      84)
 203   RELOC_NUMBER (R_ARM_MOVT_BREL,         85)
 204   RELOC_NUMBER (R_ARM_MOVW_BREL,         86)
 205   RELOC_NUMBER (R_ARM_THM_MOVW_BREL_NC,  87)
 206   RELOC_NUMBER (R_ARM_THM_MOVT_BREL,     88)
 207   RELOC_NUMBER (R_ARM_THM_MOVW_BREL,     89)
 208   RELOC_NUMBER (R_ARM_TLS_GOTDESC,       90)
 209   RELOC_NUMBER (R_ARM_TLS_CALL,          91)
 210   RELOC_NUMBER (R_ARM_TLS_DESCSEQ,       92)
 211   RELOC_NUMBER (R_ARM_THM_TLS_CALL,      93)
 212   RELOC_NUMBER (R_ARM_PLT32_ABS,         94)
 213   RELOC_NUMBER (R_ARM_GOT_ABS,           95)
 214   RELOC_NUMBER (R_ARM_GOT_PREL,          96)
 215   RELOC_NUMBER (R_ARM_GOT_BREL12,        97)
 216   RELOC_NUMBER (R_ARM_GOTOFF12,          98)
 217   RELOC_NUMBER (R_ARM_GOTRELAX,          99)
 218   RELOC_NUMBER (R_ARM_GNU_VTENTRY,      100)   /* deprecated - old C++ abi */
 219   RELOC_NUMBER (R_ARM_GNU_VTINHERIT,    101)   /* deprecated - old C++ abi */
 220   RELOC_NUMBER (R_ARM_THM_JUMP11,       102)
 221   RELOC_NUMBER (R_ARM_THM_JUMP8,        103)
 222   RELOC_NUMBER (R_ARM_TLS_GD32,         104)
 223   RELOC_NUMBER (R_ARM_TLS_LDM32,        105)
 224   RELOC_NUMBER (R_ARM_TLS_LDO32,        106)
 225   RELOC_NUMBER (R_ARM_TLS_IE32,         107)
 226   RELOC_NUMBER (R_ARM_TLS_LE32,         108)
 227   RELOC_NUMBER (R_ARM_TLS_LDO12,        109)
 228   RELOC_NUMBER (R_ARM_TLS_LE12,         110)
 229   RELOC_NUMBER (R_ARM_TLS_IE12GP,       111)
 230   /* 112 - 127 private range */
 231   RELOC_NUMBER (R_ARM_ME_TOO,           128)   /* obsolete */
 232   RELOC_NUMBER (R_ARM_THM_TLS_DESCSEQ  ,129)
 233
 234   RELOC_NUMBER (R_ARM_THM_ALU_ABS_G0_NC,132)
 235   RELOC_NUMBER (R_ARM_THM_ALU_ABS_G1_NC,133)
 236   RELOC_NUMBER (R_ARM_THM_ALU_ABS_G2_NC,134)
 237   RELOC_NUMBER (R_ARM_THM_ALU_ABS_G3_NC,135)
 238
 239   RELOC_NUMBER (R_ARM_IRELATIVE,        160)
 240
 241   /* Extensions?  R=read-only?  */
 242   RELOC_NUMBER (R_ARM_RXPC25,           249)
 243   RELOC_NUMBER (R_ARM_RSBREL32,         250)
 244   RELOC_NUMBER (R_ARM_THM_RPC22,        251)
 245   RELOC_NUMBER (R_ARM_RREL32,           252)
 246   RELOC_NUMBER (R_ARM_RABS32,           253)
 247   RELOC_NUMBER (R_ARM_RPC24,            254)
 248   RELOC_NUMBER (R_ARM_RBASE,            255)
 249
 250   /* Unofficial names for some of the relocs.  */
 251   FAKE_RELOC (R_ARM_GOTOFF,             R_ARM_GOTOFF32)   /* 32 bit offset to GOT.  */
 252   FAKE_RELOC (R_ARM_THM_PC22,           R_ARM_THM_CALL)
 253   FAKE_RELOC (R_ARM_THM_PC11,           R_ARM_THM_JUMP11)
 254   FAKE_RELOC (R_ARM_THM_PC9,            R_ARM_THM_JUMP8)
 255
 256   /* Relocs with both a different name, and (apparently) different meaning in
 257      GNU usage.  */
 258   FAKE_RELOC (R_ARM_GOTPC,              R_ARM_BASE_PREL)  /* 32 bit PC relative offset to GOT.  */
 259   FAKE_RELOC (R_ARM_GOT32,              R_ARM_GOT_BREL)   /* 32 bit GOT entry.  */
 260   FAKE_RELOC (R_ARM_ROSEGREL32,         R_ARM_SBREL31)    /* ??? */
 261   FAKE_RELOC (R_ARM_AMP_VCALL9,         R_ARM_BREL_ADJ)   /* Thumb-something.  Not used.  */
 262
 263 END_RELOC_NUMBERS (R_ARM_max = 256)
 264
 265 #ifdef BFD_ARCH_SIZE
 266 /* EABI object attributes.  */
 267
 268 enum
 269 {
 270   /* 0-3 are generic.  */
 271   Tag_CPU_raw_name = 4,
 272   Tag_CPU_name,
 273   Tag_CPU_arch,
 274   Tag_CPU_arch_profile,
 275   Tag_ARM_ISA_use,
 276   Tag_THUMB_ISA_use,
 277   Tag_FP_arch,
 278   Tag_WMMX_arch,
 279   Tag_Advanced_SIMD_arch,
 280   Tag_PCS_config,
 281   Tag_ABI_PCS_R9_use,
 282   Tag_ABI_PCS_RW_data,
 283   Tag_ABI_PCS_RO_data,
 284   Tag_ABI_PCS_GOT_use,
 285   Tag_ABI_PCS_wchar_t,
 286   Tag_ABI_FP_rounding,
 287   Tag_ABI_FP_denormal,
 288   Tag_ABI_FP_exceptions,
 289   Tag_ABI_FP_user_exceptions,
 290   Tag_ABI_FP_number_model,
 291   Tag_ABI_align_needed,
 292   Tag_ABI_align_preserved,
 293   Tag_ABI_enum_size,
 294   Tag_ABI_HardFP_use,
 295   Tag_ABI_VFP_args,
 296   Tag_ABI_WMMX_args,
 297   Tag_ABI_optimization_goals,
 298   Tag_ABI_FP_optimization_goals,
 299   /* 32 is generic (Tag_compatibility).  */
 300   Tag_undefined33 = 33,
 301   Tag_CPU_unaligned_access,
 302   Tag_undefined35,
 303   Tag_FP_HP_extension,
 304   Tag_undefined37,
 305   Tag_ABI_FP_16bit_format,
 306   Tag_undefined39,
 307   Tag_undefined40,
 308   Tag_undefined41,
 309   Tag_MPextension_use,
 310   Tag_undefined_43,
 311   Tag_DIV_use,
 312   Tag_nodefaults = 64,
 313   Tag_also_compatible_with,
 314   Tag_T2EE_use,
 315   Tag_conformance,
 316   Tag_Virtualization_use,
 317   Tag_undefined69,
 318   Tag_MPextension_use_legacy,
 319
 320   /* The following tags are legacy names for other tags.  */
 321   Tag_VFP_arch = Tag_FP_arch,
 322   Tag_ABI_align8_needed = Tag_ABI_align_needed,
 323   Tag_ABI_align8_preserved = Tag_ABI_align_preserved,
 324   Tag_VFP_HP_extension = Tag_FP_HP_extension
 325 };
 326
 327 /* Values for Tag_ABI_FP_number_model.  */
 328 enum
 329 {
 330   AEABI_FP_number_model_none = 0,
 331   AEABI_FP_number_model_ieee754_number = 1,
 332   AEABI_FP_number_model_rtabi = 2,
 333   AEABI_FP_number_model_ieee754_all = 3
 334 };
 335
 336 /* Values for Tag_ABI_VFP_args.  */
 337 enum
 338 {
 339   AEABI_VFP_args_base = 0,
 340   AEABI_VFP_args_vfp = 1,
 341   AEABI_VFP_args_toolchain = 2,
 342   AEABI_VFP_args_compatible = 3
 343 };
 344 #endif
 345
 346 /* The name of the note section used to identify arm variants.  */
 347 #define ARM_NOTE_SECTION ".note.gnu.arm.ident"
 348
 349 /* Special section names.  */
 350 #define ELF_STRING_ARM_unwind           ".ARM.exidx"
 351 #define ELF_STRING_ARM_unwind_info      ".ARM.extab"
 352 #define ELF_STRING_ARM_unwind_once      ".gnu.linkonce.armexidx."
 353 #define ELF_STRING_ARM_unwind_info_once ".gnu.linkonce.armextab."
 354
 355 enum arm_st_branch_type {
 356   ST_BRANCH_TO_ARM,
 357   ST_BRANCH_TO_THUMB,
 358   ST_BRANCH_LONG,
 359   ST_BRANCH_UNKNOWN
 360 };
 361
 362 #define ARM_SYM_BRANCH_TYPE(SYM) \
 363   ((enum arm_st_branch_type) (SYM)->st_target_internal)
 364
 365 #endif /* _ELF_ARM_H */