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  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_COMDEF         0x80000000   /* Section may be multiply defined in the input to a link step.  */
  86.  
  87. /* ARM-specific program header flags.  */
  88. #define PF_ARM_SB          0x10000000   /* Segment contains the location addressed by the static base.  */
  89. #define PF_ARM_PI          0x20000000   /* Segment is position-independent.  */
  90. #define PF_ARM_ABS         0x40000000   /* Segment must be loaded at its base address.  */
  91.  
  92. /* Values for the Tag_CPU_arch EABI attribute.  */
  93. #define TAG_CPU_ARCH_PRE_V4     0
  94. #define TAG_CPU_ARCH_V4         1
  95. #define TAG_CPU_ARCH_V4T        2
  96. #define TAG_CPU_ARCH_V5T        3
  97. #define TAG_CPU_ARCH_V5TE       4
  98. #define TAG_CPU_ARCH_V5TEJ      5
  99. #define TAG_CPU_ARCH_V6         6
  100. #define TAG_CPU_ARCH_V6KZ       7
  101. #define TAG_CPU_ARCH_V6T2       8
  102. #define TAG_CPU_ARCH_V6K        9
  103. #define TAG_CPU_ARCH_V7         10
  104. #define TAG_CPU_ARCH_V6_M       11
  105. #define TAG_CPU_ARCH_V6S_M      12
  106. #define TAG_CPU_ARCH_V7E_M      13
  107. #define TAG_CPU_ARCH_V8         14
  108. #define MAX_TAG_CPU_ARCH        14
  109. /* Pseudo-architecture to allow objects to be compatible with the subset of
  110.    armv4t and armv6-m.  This value should never be stored in object files.  */
  111. #define TAG_CPU_ARCH_V4T_PLUS_V6_M (MAX_TAG_CPU_ARCH + 1)
  112.  
  113. /* Relocation types.  */
  114.  
  115. START_RELOC_NUMBERS (elf_arm_reloc_type)
  116. /* AAELF official names and numbers.  */
  117.   RELOC_NUMBER (R_ARM_NONE,               0)
  118.   RELOC_NUMBER (R_ARM_PC24,               1)   /* deprecated */
  119.   RELOC_NUMBER (R_ARM_ABS32,              2)
  120.   RELOC_NUMBER (R_ARM_REL32,              3)
  121.   RELOC_NUMBER (R_ARM_LDR_PC_G0,          4)
  122.   RELOC_NUMBER (R_ARM_ABS16,              5)
  123.   RELOC_NUMBER (R_ARM_ABS12,              6)
  124.   RELOC_NUMBER (R_ARM_THM_ABS5,           7)
  125.   RELOC_NUMBER (R_ARM_ABS8,               8)
  126.   RELOC_NUMBER (R_ARM_SBREL32,            9)
  127.   RELOC_NUMBER (R_ARM_THM_CALL,          10)
  128.   RELOC_NUMBER (R_ARM_THM_PC8,           11)
  129.   RELOC_NUMBER (R_ARM_BREL_ADJ,          12)
  130.   RELOC_NUMBER (R_ARM_TLS_DESC,          13)
  131.   RELOC_NUMBER (R_ARM_THM_SWI8,          14)   /* obsolete */
  132.   RELOC_NUMBER (R_ARM_XPC25,             15)   /* obsolete */
  133.   RELOC_NUMBER (R_ARM_THM_XPC22,         16)   /* obsolete */
  134.   RELOC_NUMBER (R_ARM_TLS_DTPMOD32,      17)
  135.   RELOC_NUMBER (R_ARM_TLS_DTPOFF32,      18)
  136.   RELOC_NUMBER (R_ARM_TLS_TPOFF32,       19)
  137.   RELOC_NUMBER (R_ARM_COPY,              20)   /* Copy symbol at runtime.  */
  138.   RELOC_NUMBER (R_ARM_GLOB_DAT,          21)   /* Create GOT entry.  */
  139.   RELOC_NUMBER (R_ARM_JUMP_SLOT,         22)   /* Create PLT entry.  */
  140.   RELOC_NUMBER (R_ARM_RELATIVE,          23)   /* Adjust by program base.  */
  141.   RELOC_NUMBER (R_ARM_GOTOFF32,          24)   /* 32 bit offset to GOT.  */
  142.   RELOC_NUMBER (R_ARM_BASE_PREL,         25)   /* 32 bit PC relative offset to GOT.  */
  143.   RELOC_NUMBER (R_ARM_GOT_BREL,          26)   /* 32 bit GOT entry.  */
  144.   RELOC_NUMBER (R_ARM_PLT32,             27)   /* deprecated - 32 bit PLT address.  */
  145.   RELOC_NUMBER (R_ARM_CALL,              28)
  146.   RELOC_NUMBER (R_ARM_JUMP24,            29)
  147.   RELOC_NUMBER (R_ARM_THM_JUMP24,        30)
  148.   RELOC_NUMBER (R_ARM_BASE_ABS,          31)
  149.   RELOC_NUMBER (R_ARM_ALU_PCREL7_0,      32)   /* obsolete */
  150.   RELOC_NUMBER (R_ARM_ALU_PCREL15_8,     33)   /* obsolete */
  151.   RELOC_NUMBER (R_ARM_ALU_PCREL23_15,    34)   /* obsolete */
  152.   RELOC_NUMBER (R_ARM_LDR_SBREL_11_0,    35)   /* deprecated, should have _NC suffix */
  153.   RELOC_NUMBER (R_ARM_ALU_SBREL_19_12,   36)   /* deprecated, should have _NC suffix */
  154.   RELOC_NUMBER (R_ARM_ALU_SBREL_27_20,   37)   /* deprecated, should have _CK suffix */
  155.   RELOC_NUMBER (R_ARM_TARGET1,           38)
  156.   RELOC_NUMBER (R_ARM_SBREL31,           39)   /* deprecated */
  157.   RELOC_NUMBER (R_ARM_V4BX,              40)
  158.   RELOC_NUMBER (R_ARM_TARGET2,           41)
  159.   RELOC_NUMBER (R_ARM_PREL31,            42)
  160.   RELOC_NUMBER (R_ARM_MOVW_ABS_NC,       43)
  161.   RELOC_NUMBER (R_ARM_MOVT_ABS,          44)
  162.   RELOC_NUMBER (R_ARM_MOVW_PREL_NC,      45)
  163.   RELOC_NUMBER (R_ARM_MOVT_PREL,         46)
  164.   RELOC_NUMBER (R_ARM_THM_MOVW_ABS_NC,   47)
  165.   RELOC_NUMBER (R_ARM_THM_MOVT_ABS,      48)
  166.   RELOC_NUMBER (R_ARM_THM_MOVW_PREL_NC,  49)
  167.   RELOC_NUMBER (R_ARM_THM_MOVT_PREL,     50)
  168.   RELOC_NUMBER (R_ARM_THM_JUMP19,        51)
  169.   RELOC_NUMBER (R_ARM_THM_JUMP6,         52)
  170.   RELOC_NUMBER (R_ARM_THM_ALU_PREL_11_0, 53)
  171.   RELOC_NUMBER (R_ARM_THM_PC12,          54)
  172.   RELOC_NUMBER (R_ARM_ABS32_NOI,         55)
  173.   RELOC_NUMBER (R_ARM_REL32_NOI,         56)
  174.   RELOC_NUMBER (R_ARM_ALU_PC_G0_NC,      57)
  175.   RELOC_NUMBER (R_ARM_ALU_PC_G0,         58)
  176.   RELOC_NUMBER (R_ARM_ALU_PC_G1_NC,      59)
  177.   RELOC_NUMBER (R_ARM_ALU_PC_G1,         60)
  178.   RELOC_NUMBER (R_ARM_ALU_PC_G2,         61)
  179.   RELOC_NUMBER (R_ARM_LDR_PC_G1,         62)
  180.   RELOC_NUMBER (R_ARM_LDR_PC_G2,         63)
  181.   RELOC_NUMBER (R_ARM_LDRS_PC_G0,        64)
  182.   RELOC_NUMBER (R_ARM_LDRS_PC_G1,        65)
  183.   RELOC_NUMBER (R_ARM_LDRS_PC_G2,        66)
  184.   RELOC_NUMBER (R_ARM_LDC_PC_G0,         67)
  185.   RELOC_NUMBER (R_ARM_LDC_PC_G1,         68)
  186.   RELOC_NUMBER (R_ARM_LDC_PC_G2,         69)
  187.   RELOC_NUMBER (R_ARM_ALU_SB_G0_NC,      70)
  188.   RELOC_NUMBER (R_ARM_ALU_SB_G0,         71)
  189.   RELOC_NUMBER (R_ARM_ALU_SB_G1_NC,      72)
  190.   RELOC_NUMBER (R_ARM_ALU_SB_G1,         73)
  191.   RELOC_NUMBER (R_ARM_ALU_SB_G2,         74)
  192.   RELOC_NUMBER (R_ARM_LDR_SB_G0,         75)
  193.   RELOC_NUMBER (R_ARM_LDR_SB_G1,         76)
  194.   RELOC_NUMBER (R_ARM_LDR_SB_G2,         77)
  195.   RELOC_NUMBER (R_ARM_LDRS_SB_G0,        78)
  196.   RELOC_NUMBER (R_ARM_LDRS_SB_G1,        79)
  197.   RELOC_NUMBER (R_ARM_LDRS_SB_G2,        80)
  198.   RELOC_NUMBER (R_ARM_LDC_SB_G0,         81)
  199.   RELOC_NUMBER (R_ARM_LDC_SB_G1,         82)
  200.   RELOC_NUMBER (R_ARM_LDC_SB_G2,         83)
  201.   RELOC_NUMBER (R_ARM_MOVW_BREL_NC,      84)
  202.   RELOC_NUMBER (R_ARM_MOVT_BREL,         85)
  203.   RELOC_NUMBER (R_ARM_MOVW_BREL,         86)
  204.   RELOC_NUMBER (R_ARM_THM_MOVW_BREL_NC,  87)
  205.   RELOC_NUMBER (R_ARM_THM_MOVT_BREL,     88)
  206.   RELOC_NUMBER (R_ARM_THM_MOVW_BREL,     89)
  207.   RELOC_NUMBER (R_ARM_TLS_GOTDESC,       90)
  208.   RELOC_NUMBER (R_ARM_TLS_CALL,          91)
  209.   RELOC_NUMBER (R_ARM_TLS_DESCSEQ,       92)
  210.   RELOC_NUMBER (R_ARM_THM_TLS_CALL,      93)
  211.   RELOC_NUMBER (R_ARM_PLT32_ABS,         94)
  212.   RELOC_NUMBER (R_ARM_GOT_ABS,           95)
  213.   RELOC_NUMBER (R_ARM_GOT_PREL,          96)
  214.   RELOC_NUMBER (R_ARM_GOT_BREL12,        97)
  215.   RELOC_NUMBER (R_ARM_GOTOFF12,          98)
  216.   RELOC_NUMBER (R_ARM_GOTRELAX,          99)
  217.   RELOC_NUMBER (R_ARM_GNU_VTENTRY,      100)   /* deprecated - old C++ abi */
  218.   RELOC_NUMBER (R_ARM_GNU_VTINHERIT,    101)   /* deprecated - old C++ abi */
  219.   RELOC_NUMBER (R_ARM_THM_JUMP11,       102)
  220.   RELOC_NUMBER (R_ARM_THM_JUMP8,        103)
  221.   RELOC_NUMBER (R_ARM_TLS_GD32,         104)
  222.   RELOC_NUMBER (R_ARM_TLS_LDM32,        105)
  223.   RELOC_NUMBER (R_ARM_TLS_LDO32,        106)
  224.   RELOC_NUMBER (R_ARM_TLS_IE32,         107)
  225.   RELOC_NUMBER (R_ARM_TLS_LE32,         108)
  226.   RELOC_NUMBER (R_ARM_TLS_LDO12,        109)
  227.   RELOC_NUMBER (R_ARM_TLS_LE12,         110)
  228.   RELOC_NUMBER (R_ARM_TLS_IE12GP,       111)
  229.   /* 112 - 127 private range */
  230.   RELOC_NUMBER (R_ARM_ME_TOO,           128)   /* obsolete */
  231.   RELOC_NUMBER (R_ARM_THM_TLS_DESCSEQ  ,129)
  232.  
  233.   RELOC_NUMBER (R_ARM_IRELATIVE,        160)
  234.  
  235.   /* Extensions?  R=read-only?  */
  236.   RELOC_NUMBER (R_ARM_RXPC25,           249)
  237.   RELOC_NUMBER (R_ARM_RSBREL32,         250)
  238.   RELOC_NUMBER (R_ARM_THM_RPC22,        251)
  239.   RELOC_NUMBER (R_ARM_RREL32,           252)
  240.   RELOC_NUMBER (R_ARM_RABS32,           253)
  241.   RELOC_NUMBER (R_ARM_RPC24,            254)
  242.   RELOC_NUMBER (R_ARM_RBASE,            255)
  243.  
  244.   /* Unofficial names for some of the relocs.  */
  245.   FAKE_RELOC (R_ARM_GOTOFF,             R_ARM_GOTOFF32)   /* 32 bit offset to GOT.  */
  246.   FAKE_RELOC (R_ARM_THM_PC22,           R_ARM_THM_CALL)
  247.   FAKE_RELOC (R_ARM_THM_PC11,           R_ARM_THM_JUMP11)
  248.   FAKE_RELOC (R_ARM_THM_PC9,            R_ARM_THM_JUMP8)
  249.  
  250.   /* Relocs with both a different name, and (apparently) different meaning in
  251.      GNU usage.  */
  252.   FAKE_RELOC (R_ARM_GOTPC,              R_ARM_BASE_PREL)  /* 32 bit PC relative offset to GOT.  */
  253.   FAKE_RELOC (R_ARM_GOT32,              R_ARM_GOT_BREL)   /* 32 bit GOT entry.  */
  254.   FAKE_RELOC (R_ARM_ROSEGREL32,         R_ARM_SBREL31)    /* ??? */
  255.   FAKE_RELOC (R_ARM_AMP_VCALL9,         R_ARM_BREL_ADJ)   /* Thumb-something.  Not used.  */
  256.  
  257. END_RELOC_NUMBERS (R_ARM_max = 256)
  258.  
  259. #ifdef BFD_ARCH_SIZE
  260. /* EABI object attributes.  */
  261.  
  262. enum
  263. {
  264.   /* 0-3 are generic.  */
  265.   Tag_CPU_raw_name = 4,
  266.   Tag_CPU_name,
  267.   Tag_CPU_arch,
  268.   Tag_CPU_arch_profile,
  269.   Tag_ARM_ISA_use,
  270.   Tag_THUMB_ISA_use,
  271.   Tag_FP_arch,
  272.   Tag_WMMX_arch,
  273.   Tag_Advanced_SIMD_arch,
  274.   Tag_PCS_config,
  275.   Tag_ABI_PCS_R9_use,
  276.   Tag_ABI_PCS_RW_data,
  277.   Tag_ABI_PCS_RO_data,
  278.   Tag_ABI_PCS_GOT_use,
  279.   Tag_ABI_PCS_wchar_t,
  280.   Tag_ABI_FP_rounding,
  281.   Tag_ABI_FP_denormal,
  282.   Tag_ABI_FP_exceptions,
  283.   Tag_ABI_FP_user_exceptions,
  284.   Tag_ABI_FP_number_model,
  285.   Tag_ABI_align_needed,
  286.   Tag_ABI_align_preserved,
  287.   Tag_ABI_enum_size,
  288.   Tag_ABI_HardFP_use,
  289.   Tag_ABI_VFP_args,
  290.   Tag_ABI_WMMX_args,
  291.   Tag_ABI_optimization_goals,
  292.   Tag_ABI_FP_optimization_goals,
  293.   /* 32 is generic (Tag_compatibility).  */
  294.   Tag_undefined33 = 33,
  295.   Tag_CPU_unaligned_access,
  296.   Tag_undefined35,
  297.   Tag_FP_HP_extension,
  298.   Tag_undefined37,
  299.   Tag_ABI_FP_16bit_format,
  300.   Tag_undefined39,
  301.   Tag_undefined40,
  302.   Tag_undefined41,
  303.   Tag_MPextension_use,
  304.   Tag_undefined_43,
  305.   Tag_DIV_use,
  306.   Tag_nodefaults = 64,
  307.   Tag_also_compatible_with,
  308.   Tag_T2EE_use,
  309.   Tag_conformance,
  310.   Tag_Virtualization_use,
  311.   Tag_undefined69,
  312.   Tag_MPextension_use_legacy,
  313.  
  314.   /* The following tags are legacy names for other tags.  */
  315.   Tag_VFP_arch = Tag_FP_arch,
  316.   Tag_ABI_align8_needed = Tag_ABI_align_needed,
  317.   Tag_ABI_align8_preserved = Tag_ABI_align_preserved,
  318.   Tag_VFP_HP_extension = Tag_FP_HP_extension
  319. };
  320.  
  321. /* Values for Tag_ABI_FP_number_model.  */
  322. enum
  323. {
  324.   AEABI_FP_number_model_none = 0,
  325.   AEABI_FP_number_model_ieee754_number = 1,
  326.   AEABI_FP_number_model_rtabi = 2,
  327.   AEABI_FP_number_model_ieee754_all = 3
  328. };
  329.  
  330. /* Values for Tag_ABI_VFP_args.  */
  331. enum
  332. {
  333.   AEABI_VFP_args_base = 0,
  334.   AEABI_VFP_args_vfp = 1,
  335.   AEABI_VFP_args_toolchain = 2,
  336.   AEABI_VFP_args_compatible = 3
  337. };
  338. #endif
  339.  
  340. /* The name of the note section used to identify arm variants.  */
  341. #define ARM_NOTE_SECTION ".note.gnu.arm.ident"
  342.  
  343. /* Special section names.  */
  344. #define ELF_STRING_ARM_unwind           ".ARM.exidx"
  345. #define ELF_STRING_ARM_unwind_info      ".ARM.extab"
  346. #define ELF_STRING_ARM_unwind_once      ".gnu.linkonce.armexidx."
  347. #define ELF_STRING_ARM_unwind_info_once ".gnu.linkonce.armextab."
  348.  
  349. enum arm_st_branch_type {
  350.   ST_BRANCH_TO_ARM,
  351.   ST_BRANCH_TO_THUMB,
  352.   ST_BRANCH_LONG,
  353.   ST_BRANCH_UNKNOWN
  354. };
  355.  
  356. #define ARM_SYM_BRANCH_TYPE(SYM) \
  357.   ((enum arm_st_branch_type) (SYM)->st_target_internal)
  358.  
  359. #endif /* _ELF_ARM_H */
  360.