include/elf/arm.h

   1 /* ARM ELF support for BFD.
   2    Copyright 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2009, 2010
   3    Free Software Foundation, Inc.
   4
   5    This file is part of BFD, the Binary File Descriptor library.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software Foundation,
  19    Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */
  20
  21 #ifndef _ELF_ARM_H
  22 #define _ELF_ARM_H
  23
  24 #include "elf/reloc-macros.h"
  25
  26 /* Processor specific flags for the ELF header e_flags field.  */
  27 #define EF_ARM_RELEXEC     0x01
  28 #define EF_ARM_HASENTRY    0x02
  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
  39
  40 /* Frame unwind information */
  41 #define PT_ARM_EXIDX (PT_LOPROC + 1)
  42
  43 /* Other constants defined in the ARM ELF spec. version B-01.  */
  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.  */
  47 #define EF_ARM_EABIMASK      0xFF000000
  48
  49 /* Constants defined in AAELF.  */
  50 #define EF_ARM_BE8          0x00800000
  51 #define EF_ARM_LE8          0x00400000
  52
  53 #define EF_ARM_EABI_VERSION(flags) ((flags) & EF_ARM_EABIMASK)
  54 #define EF_ARM_EABI_UNKNOWN  0x00000000
  55 #define EF_ARM_EABI_VER1     0x01000000
  56 #define EF_ARM_EABI_VER2     0x02000000
  57 #define EF_ARM_EABI_VER3     0x03000000
  58 #define EF_ARM_EABI_VER4     0x04000000
  59 #define EF_ARM_EABI_VER5     0x05000000
  60
  61 /* Local aliases for some flags to match names used by COFF port.  */
  62 #define F_INTERWORK        EF_ARM_INTERWORK
  63 #define F_APCS26           EF_ARM_APCS_26
  64 #define F_APCS_FLOAT       EF_ARM_APCS_FLOAT
  65 #define F_PIC              EF_ARM_PIC
  66 #define F_SOFT_FLOAT       EF_ARM_SOFT_FLOAT
  67 #define F_VFP_FLOAT        EF_ARM_VFP_FLOAT
  68
  69 /* Additional symbol types for Thumb.  */
  70 #define STT_ARM_TFUNC      STT_LOPROC   /* A Thumb function.  */
  71 #define STT_ARM_16BIT      STT_HIPROC   /* A Thumb label.  */
  72
  73 /* Additional section types.  */
  74 #define SHT_ARM_EXIDX          0x70000001       /* Section holds ARM unwind info.  */
  75 #define SHT_ARM_PREEMPTMAP     0x70000002       /* Section pre-emption details.  */
  76 #define SHT_ARM_ATTRIBUTES     0x70000003       /* Section holds attributes.  */
  77 #define SHT_ARM_DEBUGOVERLAY   0x70000004       /* Section holds overlay debug info.  */
  78 #define SHT_ARM_OVERLAYSECTION 0x70000005       /* Section holds GDB and overlay integration info.  */
  79
  80 /* ARM-specific values for sh_flags.  */
  81 #define SHF_ENTRYSECT      0x10000000   /* Section contains an entry point.  */
  82 #define SHF_COMDEF         0x80000000   /* Section may be multiply defined in the input to a link step.  */
  83
  84 /* ARM-specific program header flags.  */
  85 #define PF_ARM_SB          0x10000000   /* Segment contains the location addressed by the static base.  */
  86 #define PF_ARM_PI          0x20000000   /* Segment is position-independent.  */
  87 #define PF_ARM_ABS         0x40000000   /* Segment must be loaded at its base address.  */
  88
  89 /* Values for the Tag_CPU_arch EABI attribute.  */
  90 #define TAG_CPU_ARCH_PRE_V4     0
  91 #define TAG_CPU_ARCH_V4         1
  92 #define TAG_CPU_ARCH_V4T        2
  93 #define TAG_CPU_ARCH_V5T        3
  94 #define TAG_CPU_ARCH_V5TE       4
  95 #define TAG_CPU_ARCH_V5TEJ      5
  96 #define TAG_CPU_ARCH_V6         6
  97 #define TAG_CPU_ARCH_V6KZ       7
  98 #define TAG_CPU_ARCH_V6T2       8
  99 #define TAG_CPU_ARCH_V6K        9
 100 #define TAG_CPU_ARCH_V7         10
 101 #define TAG_CPU_ARCH_V6_M       11
 102 #define TAG_CPU_ARCH_V6S_M      12
 103 #define TAG_CPU_ARCH_V7E_M      13
 104 #define MAX_TAG_CPU_ARCH        13
 105 /* Pseudo-architecture to allow objects to be compatible with the subset of
 106    armv4t and armv6-m.  This value should never be stored in object files.  */
 107 #define TAG_CPU_ARCH_V4T_PLUS_V6_M (MAX_TAG_CPU_ARCH + 1)
 108
 109 /* Relocation types.  */
 110
 111 START_RELOC_NUMBERS (elf_arm_reloc_type)
 112 /* AAELF official names and numbers.  */
 113   RELOC_NUMBER (R_ARM_NONE,               0)
 114   RELOC_NUMBER (R_ARM_PC24,               1)   /* deprecated */
 115   RELOC_NUMBER (R_ARM_ABS32,              2)
 116   RELOC_NUMBER (R_ARM_REL32,              3)
 117   RELOC_NUMBER (R_ARM_LDR_PC_G0,          4)
 118   RELOC_NUMBER (R_ARM_ABS16,              5)
 119   RELOC_NUMBER (R_ARM_ABS12,              6)
 120   RELOC_NUMBER (R_ARM_THM_ABS5,           7)
 121   RELOC_NUMBER (R_ARM_ABS8,               8)
 122   RELOC_NUMBER (R_ARM_SBREL32,            9)
 123   RELOC_NUMBER (R_ARM_THM_CALL,          10)
 124   RELOC_NUMBER (R_ARM_THM_PC8,           11)
 125   RELOC_NUMBER (R_ARM_BREL_ADJ,          12)
 126   RELOC_NUMBER (R_ARM_SWI24,             13)   /* obsolete */
 127   RELOC_NUMBER (R_ARM_THM_SWI8,          14)   /* obsolete */
 128   RELOC_NUMBER (R_ARM_XPC25,             15)   /* obsolete */
 129   RELOC_NUMBER (R_ARM_THM_XPC22,         16)   /* obsolete */
 130   RELOC_NUMBER (R_ARM_TLS_DTPMOD32,      17)
 131   RELOC_NUMBER (R_ARM_TLS_DTPOFF32,      18)
 132   RELOC_NUMBER (R_ARM_TLS_TPOFF32,       19)
 133   RELOC_NUMBER (R_ARM_COPY,              20)   /* Copy symbol at runtime.  */
 134   RELOC_NUMBER (R_ARM_GLOB_DAT,          21)   /* Create GOT entry.  */
 135   RELOC_NUMBER (R_ARM_JUMP_SLOT,         22)   /* Create PLT entry.  */
 136   RELOC_NUMBER (R_ARM_RELATIVE,          23)   /* Adjust by program base.  */
 137   RELOC_NUMBER (R_ARM_GOTOFF32,          24)   /* 32 bit offset to GOT.  */
 138   RELOC_NUMBER (R_ARM_BASE_PREL,         25)   /* 32 bit PC relative offset to GOT.  */
 139   RELOC_NUMBER (R_ARM_GOT_BREL,          26)   /* 32 bit GOT entry.  */
 140   RELOC_NUMBER (R_ARM_PLT32,             27)   /* deprecated - 32 bit PLT address.  */
 141   RELOC_NUMBER (R_ARM_CALL,              28)
 142   RELOC_NUMBER (R_ARM_JUMP24,            29)
 143   RELOC_NUMBER (R_ARM_THM_JUMP24,        30)
 144   RELOC_NUMBER (R_ARM_BASE_ABS,          31)
 145   RELOC_NUMBER (R_ARM_ALU_PCREL7_0,      32)   /* obsolete */
 146   RELOC_NUMBER (R_ARM_ALU_PCREL15_8,     33)   /* obsolete */
 147   RELOC_NUMBER (R_ARM_ALU_PCREL23_15,    34)   /* obsolete */
 148   RELOC_NUMBER (R_ARM_LDR_SBREL_11_0,    35)   /* deprecated, should have _NC suffix */
 149   RELOC_NUMBER (R_ARM_ALU_SBREL_19_12,   36)   /* deprecated, should have _NC suffix */
 150   RELOC_NUMBER (R_ARM_ALU_SBREL_27_20,   37)   /* deprecated, should have _CK suffix */
 151   RELOC_NUMBER (R_ARM_TARGET1,           38)
 152   RELOC_NUMBER (R_ARM_SBREL31,           39)   /* deprecated */
 153   RELOC_NUMBER (R_ARM_V4BX,              40)
 154   RELOC_NUMBER (R_ARM_TARGET2,           41)
 155   RELOC_NUMBER (R_ARM_PREL31,            42)
 156   RELOC_NUMBER (R_ARM_MOVW_ABS_NC,       43)
 157   RELOC_NUMBER (R_ARM_MOVT_ABS,          44)
 158   RELOC_NUMBER (R_ARM_MOVW_PREL_NC,      45)
 159   RELOC_NUMBER (R_ARM_MOVT_PREL,         46)
 160   RELOC_NUMBER (R_ARM_THM_MOVW_ABS_NC,   47)
 161   RELOC_NUMBER (R_ARM_THM_MOVT_ABS,      48)
 162   RELOC_NUMBER (R_ARM_THM_MOVW_PREL_NC,  49)
 163   RELOC_NUMBER (R_ARM_THM_MOVT_PREL,     50)
 164   RELOC_NUMBER (R_ARM_THM_JUMP19,        51)
 165   RELOC_NUMBER (R_ARM_THM_JUMP6,         52)
 166   RELOC_NUMBER (R_ARM_THM_ALU_PREL_11_0, 53)
 167   RELOC_NUMBER (R_ARM_THM_PC12,          54)
 168   RELOC_NUMBER (R_ARM_ABS32_NOI,         55)
 169   RELOC_NUMBER (R_ARM_REL32_NOI,         56)
 170   RELOC_NUMBER (R_ARM_ALU_PC_G0_NC,      57)
 171   RELOC_NUMBER (R_ARM_ALU_PC_G0,         58)
 172   RELOC_NUMBER (R_ARM_ALU_PC_G1_NC,      59)
 173   RELOC_NUMBER (R_ARM_ALU_PC_G1,         60)
 174   RELOC_NUMBER (R_ARM_ALU_PC_G2,         61)
 175   RELOC_NUMBER (R_ARM_LDR_PC_G1,         62)
 176   RELOC_NUMBER (R_ARM_LDR_PC_G2,         63)
 177   RELOC_NUMBER (R_ARM_LDRS_PC_G0,        64)
 178   RELOC_NUMBER (R_ARM_LDRS_PC_G1,        65)
 179   RELOC_NUMBER (R_ARM_LDRS_PC_G2,        66)
 180   RELOC_NUMBER (R_ARM_LDC_PC_G0,         67)
 181   RELOC_NUMBER (R_ARM_LDC_PC_G1,         68)
 182   RELOC_NUMBER (R_ARM_LDC_PC_G2,         69)
 183   RELOC_NUMBER (R_ARM_ALU_SB_G0_NC,      70)
 184   RELOC_NUMBER (R_ARM_ALU_SB_G0,         71)
 185   RELOC_NUMBER (R_ARM_ALU_SB_G1_NC,      72)
 186   RELOC_NUMBER (R_ARM_ALU_SB_G1,         73)
 187   RELOC_NUMBER (R_ARM_ALU_SB_G2,         74)
 188   RELOC_NUMBER (R_ARM_LDR_SB_G0,         75)
 189   RELOC_NUMBER (R_ARM_LDR_SB_G1,         76)
 190   RELOC_NUMBER (R_ARM_LDR_SB_G2,         77)
 191   RELOC_NUMBER (R_ARM_LDRS_SB_G0,        78)
 192   RELOC_NUMBER (R_ARM_LDRS_SB_G1,        79)
 193   RELOC_NUMBER (R_ARM_LDRS_SB_G2,        80)
 194   RELOC_NUMBER (R_ARM_LDC_SB_G0,         81)
 195   RELOC_NUMBER (R_ARM_LDC_SB_G1,         82)
 196   RELOC_NUMBER (R_ARM_LDC_SB_G2,         83)
 197   RELOC_NUMBER (R_ARM_MOVW_BREL_NC,      84)
 198   RELOC_NUMBER (R_ARM_MOVT_BREL,         85)
 199   RELOC_NUMBER (R_ARM_MOVW_BREL,         86)
 200   RELOC_NUMBER (R_ARM_THM_MOVW_BREL_NC,  87)
 201   RELOC_NUMBER (R_ARM_THM_MOVT_BREL,     88)
 202   RELOC_NUMBER (R_ARM_THM_MOVW_BREL,     89)
 203   /* 90-93 unallocated */
 204   RELOC_NUMBER (R_ARM_PLT32_ABS,         94)
 205   RELOC_NUMBER (R_ARM_GOT_ABS,           95)
 206   RELOC_NUMBER (R_ARM_GOT_PREL,          96)
 207   RELOC_NUMBER (R_ARM_GOT_BREL12,        97)
 208   RELOC_NUMBER (R_ARM_GOTOFF12,          98)
 209   RELOC_NUMBER (R_ARM_GOTRELAX,          99)
 210   RELOC_NUMBER (R_ARM_GNU_VTENTRY,      100)   /* deprecated - old C++ abi */
 211   RELOC_NUMBER (R_ARM_GNU_VTINHERIT,    101)   /* deprecated - old C++ abi */
 212   RELOC_NUMBER (R_ARM_THM_JUMP11,       102)
 213   RELOC_NUMBER (R_ARM_THM_JUMP8,        103)
 214   RELOC_NUMBER (R_ARM_TLS_GD32,         104)
 215   RELOC_NUMBER (R_ARM_TLS_LDM32,        105)
 216   RELOC_NUMBER (R_ARM_TLS_LDO32,        106)
 217   RELOC_NUMBER (R_ARM_TLS_IE32,         107)
 218   RELOC_NUMBER (R_ARM_TLS_LE32,         108)
 219   RELOC_NUMBER (R_ARM_TLS_LDO12,        109)
 220   RELOC_NUMBER (R_ARM_TLS_LE12,         110)
 221   RELOC_NUMBER (R_ARM_TLS_IE12GP,       111)
 222   /* 112 - 127 private range */
 223   RELOC_NUMBER (R_ARM_ME_TOO,           128)   /* obsolete */
 224
 225   /* Extensions?  R=read-only?  */
 226   RELOC_NUMBER (R_ARM_RXPC25,           249)
 227   RELOC_NUMBER (R_ARM_RSBREL32,         250)
 228   RELOC_NUMBER (R_ARM_THM_RPC22,        251)
 229   RELOC_NUMBER (R_ARM_RREL32,           252)
 230   RELOC_NUMBER (R_ARM_RABS32,           253)
 231   RELOC_NUMBER (R_ARM_RPC24,            254)
 232   RELOC_NUMBER (R_ARM_RBASE,            255)
 233
 234   /* Unofficial names for some of the relocs.  */
 235   FAKE_RELOC (R_ARM_GOTOFF,             R_ARM_GOTOFF32)   /* 32 bit offset to GOT.  */
 236   FAKE_RELOC (R_ARM_THM_PC22,           R_ARM_THM_CALL)
 237   FAKE_RELOC (R_ARM_THM_PC11,           R_ARM_THM_JUMP11)
 238   FAKE_RELOC (R_ARM_THM_PC9,            R_ARM_THM_JUMP8)
 239
 240   /* Relocs with both a different name, and (apparently) different meaning in
 241      GNU usage.  */
 242   FAKE_RELOC (R_ARM_GOTPC,              R_ARM_BASE_PREL)  /* 32 bit PC relative offset to GOT.  */
 243   FAKE_RELOC (R_ARM_GOT32,              R_ARM_GOT_BREL)   /* 32 bit GOT entry.  */
 244   FAKE_RELOC (R_ARM_ROSEGREL32,         R_ARM_SBREL31)    /* ??? */
 245   FAKE_RELOC (R_ARM_AMP_VCALL9,         R_ARM_BREL_ADJ)   /* Thumb-something.  Not used.  */
 246
 247 END_RELOC_NUMBERS (R_ARM_max = 256)
 248
 249 #ifdef BFD_ARCH_SIZE
 250 /* EABI object attributes.  */
 251
 252 enum
 253 {
 254   /* 0-3 are generic.  */
 255   Tag_CPU_raw_name = 4,
 256   Tag_CPU_name,
 257   Tag_CPU_arch,
 258   Tag_CPU_arch_profile,
 259   Tag_ARM_ISA_use,
 260   Tag_THUMB_ISA_use,
 261   Tag_FP_arch,
 262   Tag_WMMX_arch,
 263   Tag_Advanced_SIMD_arch,
 264   Tag_PCS_config,
 265   Tag_ABI_PCS_R9_use,
 266   Tag_ABI_PCS_RW_data,
 267   Tag_ABI_PCS_RO_data,
 268   Tag_ABI_PCS_GOT_use,
 269   Tag_ABI_PCS_wchar_t,
 270   Tag_ABI_FP_rounding,
 271   Tag_ABI_FP_denormal,
 272   Tag_ABI_FP_exceptions,
 273   Tag_ABI_FP_user_exceptions,
 274   Tag_ABI_FP_number_model,
 275   Tag_ABI_align_needed,
 276   Tag_ABI_align_preserved,
 277   Tag_ABI_enum_size,
 278   Tag_ABI_HardFP_use,
 279   Tag_ABI_VFP_args,
 280   Tag_ABI_WMMX_args,
 281   Tag_ABI_optimization_goals,
 282   Tag_ABI_FP_optimization_goals,
 283   /* 32 is generic (Tag_compatibility).  */
 284   Tag_undefined33 = 33,
 285   Tag_CPU_unaligned_access,
 286   Tag_undefined35,
 287   Tag_FP_HP_extension,
 288   Tag_undefined37,
 289   Tag_ABI_FP_16bit_format,
 290   Tag_undefined39,
 291   Tag_undefined40,
 292   Tag_undefined41,
 293   Tag_MPextension_use,
 294   Tag_undefined_43,
 295   Tag_DIV_use,
 296   Tag_nodefaults = 64,
 297   Tag_also_compatible_with,
 298   Tag_T2EE_use,
 299   Tag_conformance,
 300   Tag_Virtualization_use,
 301   Tag_undefined69,
 302   Tag_MPextension_use_legacy,
 303
 304   /* The following tags are legacy names for other tags.  */
 305   Tag_VFP_arch = Tag_FP_arch,
 306   Tag_ABI_align8_needed = Tag_ABI_align_needed,
 307   Tag_ABI_align8_preserved = Tag_ABI_align_preserved,
 308   Tag_VFP_HP_extension = Tag_FP_HP_extension
 309 };
 310
 311 #endif
 312
 313 /* The name of the note section used to identify arm variants.  */
 314 #define ARM_NOTE_SECTION ".note.gnu.arm.ident"
 315
 316 /* Special section names.  */
 317 #define ELF_STRING_ARM_unwind           ".ARM.exidx"
 318 #define ELF_STRING_ARM_unwind_info      ".ARM.extab"
 319 #define ELF_STRING_ARM_unwind_once      ".gnu.linkonce.armexidx."
 320 #define ELF_STRING_ARM_unwind_info_once ".gnu.linkonce.armextab."
 321
 322 #endif /* _ELF_ARM_H */