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      1 /* ARM ELF support for BFD.
      2    Copyright (C) 1998-2014 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_HASENTRY    0x02
     28 #define EF_ARM_INTERWORK   0x04
     29 #define EF_ARM_APCS_26     0x08
     30 #define EF_ARM_APCS_FLOAT  0x10
     31 #define EF_ARM_PIC         0x20
     32 #define EF_ARM_ALIGN8	   0x40		/* 8-bit structure alignment is in use.  */
     33 #define EF_ARM_NEW_ABI     0x80
     34 #define EF_ARM_OLD_ABI     0x100
     35 #define EF_ARM_SOFT_FLOAT  0x200
     36 #define EF_ARM_VFP_FLOAT   0x400
     37 #define EF_ARM_MAVERICK_FLOAT 0x800
     38 
     39 /* Frame unwind information */
     40 #define PT_ARM_EXIDX (PT_LOPROC + 1)
     41 
     42 /* Other constants defined in the ARM ELF spec. version B-01.  */
     43 #define EF_ARM_SYMSARESORTED 0x04	/* NB conflicts with EF_INTERWORK.  */
     44 #define EF_ARM_DYNSYMSUSESEGIDX 0x08	/* NB conflicts with EF_APCS26.  */
     45 #define EF_ARM_MAPSYMSFIRST 0x10	/* NB conflicts with EF_APCS_FLOAT.  */
     46 #define EF_ARM_EABIMASK      0xFF000000
     47 
     48 /* New constants defined in the ARM ELF spec. version XXX.
     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.  */
     52 
     53 /* Constants defined in AAELF.  */
     54 #define EF_ARM_BE8	    0x00800000
     55 #define EF_ARM_LE8	    0x00400000
     56 
     57 #define EF_ARM_EABI_VERSION(flags) ((flags) & EF_ARM_EABIMASK)
     58 #define EF_ARM_EABI_UNKNOWN  0x00000000
     59 #define EF_ARM_EABI_VER1     0x01000000
     60 #define EF_ARM_EABI_VER2     0x02000000
     61 #define EF_ARM_EABI_VER3     0x03000000
     62 #define EF_ARM_EABI_VER4     0x04000000
     63 #define EF_ARM_EABI_VER5     0x05000000
     64 
     65 /* Local aliases for some flags to match names used by COFF port.  */
     66 #define F_INTERWORK	   EF_ARM_INTERWORK
     67 #define F_APCS26	   EF_ARM_APCS_26
     68 #define F_APCS_FLOAT	   EF_ARM_APCS_FLOAT
     69 #define F_PIC              EF_ARM_PIC
     70 #define F_SOFT_FLOAT	   EF_ARM_SOFT_FLOAT
     71 #define F_VFP_FLOAT	   EF_ARM_VFP_FLOAT
     72 
     73 /* Additional symbol types for Thumb.  */
     74 #define STT_ARM_TFUNC      STT_LOPROC   /* A Thumb function.  */
     75 #define STT_ARM_16BIT      STT_HIPROC   /* A Thumb label.  */
     76 
     77 /* Additional section types.  */
     78 #define SHT_ARM_EXIDX	       0x70000001	/* Section holds ARM unwind info.  */
     79 #define SHT_ARM_PREEMPTMAP     0x70000002	/* Section pre-emption details.  */
     80 #define SHT_ARM_ATTRIBUTES     0x70000003	/* Section holds attributes.  */
     81 #define SHT_ARM_DEBUGOVERLAY   0x70000004	/* Section holds overlay debug info.  */
     82 #define SHT_ARM_OVERLAYSECTION 0x70000005	/* Section holds GDB and overlay integration info.  */
     83 
     84 /* ARM-specific values for sh_flags.  */
     85 #define SHF_ENTRYSECT      0x10000000   /* Section contains an entry point.  */
     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_IRELATIVE,      	160)
    235 
    236   /* Extensions?  R=read-only?  */
    237   RELOC_NUMBER (R_ARM_RXPC25,         	249)
    238   RELOC_NUMBER (R_ARM_RSBREL32,       	250)
    239   RELOC_NUMBER (R_ARM_THM_RPC22,      	251)
    240   RELOC_NUMBER (R_ARM_RREL32,         	252)
    241   RELOC_NUMBER (R_ARM_RABS32,         	253)
    242   RELOC_NUMBER (R_ARM_RPC24,          	254)
    243   RELOC_NUMBER (R_ARM_RBASE,          	255)
    244 
    245   /* Unofficial names for some of the relocs.  */
    246   FAKE_RELOC (R_ARM_GOTOFF,             R_ARM_GOTOFF32)   /* 32 bit offset to GOT.  */
    247   FAKE_RELOC (R_ARM_THM_PC22,           R_ARM_THM_CALL)
    248   FAKE_RELOC (R_ARM_THM_PC11,           R_ARM_THM_JUMP11)
    249   FAKE_RELOC (R_ARM_THM_PC9,            R_ARM_THM_JUMP8)
    250 
    251   /* Relocs with both a different name, and (apparently) different meaning in
    252      GNU usage.  */
    253   FAKE_RELOC (R_ARM_GOTPC,              R_ARM_BASE_PREL)  /* 32 bit PC relative offset to GOT.  */
    254   FAKE_RELOC (R_ARM_GOT32,              R_ARM_GOT_BREL)   /* 32 bit GOT entry.  */
    255   FAKE_RELOC (R_ARM_ROSEGREL32,         R_ARM_SBREL31)    /* ??? */
    256   FAKE_RELOC (R_ARM_AMP_VCALL9,         R_ARM_BREL_ADJ)   /* Thumb-something.  Not used.  */
    257 
    258 END_RELOC_NUMBERS (R_ARM_max = 256)
    259 
    260 #ifdef BFD_ARCH_SIZE
    261 /* EABI object attributes.  */
    262 
    263 enum
    264 {
    265   /* 0-3 are generic.  */
    266   Tag_CPU_raw_name = 4,
    267   Tag_CPU_name,
    268   Tag_CPU_arch,
    269   Tag_CPU_arch_profile,
    270   Tag_ARM_ISA_use,
    271   Tag_THUMB_ISA_use,
    272   Tag_FP_arch,
    273   Tag_WMMX_arch,
    274   Tag_Advanced_SIMD_arch,
    275   Tag_PCS_config,
    276   Tag_ABI_PCS_R9_use,
    277   Tag_ABI_PCS_RW_data,
    278   Tag_ABI_PCS_RO_data,
    279   Tag_ABI_PCS_GOT_use,
    280   Tag_ABI_PCS_wchar_t,
    281   Tag_ABI_FP_rounding,
    282   Tag_ABI_FP_denormal,
    283   Tag_ABI_FP_exceptions,
    284   Tag_ABI_FP_user_exceptions,
    285   Tag_ABI_FP_number_model,
    286   Tag_ABI_align_needed,
    287   Tag_ABI_align_preserved,
    288   Tag_ABI_enum_size,
    289   Tag_ABI_HardFP_use,
    290   Tag_ABI_VFP_args,
    291   Tag_ABI_WMMX_args,
    292   Tag_ABI_optimization_goals,
    293   Tag_ABI_FP_optimization_goals,
    294   /* 32 is generic (Tag_compatibility).  */
    295   Tag_undefined33 = 33,
    296   Tag_CPU_unaligned_access,
    297   Tag_undefined35,
    298   Tag_FP_HP_extension,
    299   Tag_undefined37,
    300   Tag_ABI_FP_16bit_format,
    301   Tag_undefined39,
    302   Tag_undefined40,
    303   Tag_undefined41,
    304   Tag_MPextension_use,
    305   Tag_undefined_43,
    306   Tag_DIV_use,
    307   Tag_nodefaults = 64,
    308   Tag_also_compatible_with,
    309   Tag_T2EE_use,
    310   Tag_conformance,
    311   Tag_Virtualization_use,
    312   Tag_undefined69,
    313   Tag_MPextension_use_legacy,
    314 
    315   /* The following tags are legacy names for other tags.  */
    316   Tag_VFP_arch = Tag_FP_arch,
    317   Tag_ABI_align8_needed = Tag_ABI_align_needed,
    318   Tag_ABI_align8_preserved = Tag_ABI_align_preserved,
    319   Tag_VFP_HP_extension = Tag_FP_HP_extension
    320 };
    321 
    322 /* Values for Tag_ABI_FP_number_model.  */
    323 enum
    324 {
    325   AEABI_FP_number_model_none = 0,
    326   AEABI_FP_number_model_ieee754_number = 1,
    327   AEABI_FP_number_model_rtabi = 2,
    328   AEABI_FP_number_model_ieee754_all = 3
    329 };
    330 
    331 /* Values for Tag_ABI_VFP_args.  */
    332 enum
    333 {
    334   AEABI_VFP_args_base = 0,
    335   AEABI_VFP_args_vfp = 1,
    336   AEABI_VFP_args_toolchain = 2,
    337   AEABI_VFP_args_compatible = 3
    338 };
    339 #endif
    340 
    341 /* The name of the note section used to identify arm variants.  */
    342 #define ARM_NOTE_SECTION ".note.gnu.arm.ident"
    343 
    344 /* Special section names.  */
    345 #define ELF_STRING_ARM_unwind           ".ARM.exidx"
    346 #define ELF_STRING_ARM_unwind_info      ".ARM.extab"
    347 #define ELF_STRING_ARM_unwind_once      ".gnu.linkonce.armexidx."
    348 #define ELF_STRING_ARM_unwind_info_once ".gnu.linkonce.armextab."
    349 
    350 enum arm_st_branch_type {
    351   ST_BRANCH_TO_ARM,
    352   ST_BRANCH_TO_THUMB,
    353   ST_BRANCH_LONG,
    354   ST_BRANCH_UNKNOWN
    355 };
    356 
    357 #define ARM_SYM_BRANCH_TYPE(SYM) \
    358   ((enum arm_st_branch_type) (SYM)->st_target_internal)
    359 
    360 #endif /* _ELF_ARM_H */
    361