1/* ARC-specific support for 32-bit ELF 2 Copyright 1994, 1995, 1997, 1999, 2001, 2002, 2005, 2007 3 Free Software Foundation, Inc. 4 Contributed by Doug Evans (dje@cygnus.com). 5 6 This file is part of BFD, the Binary File Descriptor library. 7 8 This program is free software; you can redistribute it and/or modify 9 it under the terms of the GNU General Public License as published by 10 the Free Software Foundation; either version 3 of the License, or 11 (at your option) any later version. 12 13 This program is distributed in the hope that it will be useful, 14 but WITHOUT ANY WARRANTY; without even the implied warranty of 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 GNU General Public License for more details. 17 18 You should have received a copy of the GNU General Public License 19 along with this program; if not, write to the Free Software 20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, 21 MA 02110-1301, USA. */ 22 23#include "sysdep.h" 24#include "bfd.h" 25#include "libbfd.h" 26#include "elf-bfd.h" 27#include "elf/arc.h" 28#include "libiberty.h" 29 30/* Try to minimize the amount of space occupied by relocation tables 31 on the ROM (not that the ROM won't be swamped by other ELF overhead). */ 32 33#define USE_REL 1 34 35static bfd_reloc_status_type 36arc_elf_b22_pcrel (bfd * abfd, 37 arelent * reloc_entry, 38 asymbol * symbol, 39 void * data, 40 asection * input_section, 41 bfd * output_bfd, 42 char ** error_message) 43{ 44 /* If linking, back up the final symbol address by the address of the 45 reloc. This cannot be accomplished by setting the pcrel_offset 46 field to TRUE, as bfd_install_relocation will detect this and refuse 47 to install the offset in the first place, but bfd_perform_relocation 48 will still insist on removing it. */ 49 if (output_bfd == NULL) 50 reloc_entry->addend -= reloc_entry->address; 51 52 /* Fall through to the default elf reloc handler. */ 53 return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, 54 input_section, output_bfd, error_message); 55} 56 57static reloc_howto_type elf_arc_howto_table[] = 58{ 59 /* This reloc does nothing. */ 60 HOWTO (R_ARC_NONE, /* Type. */ 61 0, /* Rightshift. */ 62 2, /* Size (0 = byte, 1 = short, 2 = long). */ 63 32, /* Bitsize. */ 64 FALSE, /* PC_relative. */ 65 0, /* Bitpos. */ 66 complain_overflow_bitfield, /* Complain_on_overflow. */ 67 bfd_elf_generic_reloc, /* Special_function. */ 68 "R_ARC_NONE", /* Name. */ 69 TRUE, /* Partial_inplace. */ 70 0, /* Src_mask. */ 71 0, /* Dst_mask. */ 72 FALSE), /* PCrel_offset. */ 73 74 /* A standard 32 bit relocation. */ 75 HOWTO (R_ARC_32, /* Type. */ 76 0, /* Rightshift. */ 77 2, /* Size (0 = byte, 1 = short, 2 = long). */ 78 32, /* Bitsize. */ 79 FALSE, /* PC_relative. */ 80 0, /* Bitpos. */ 81 complain_overflow_bitfield, /* Complain_on_overflow. */ 82 bfd_elf_generic_reloc, /* Special_function. */ 83 "R_ARC_32", /* Name. */ 84 TRUE, /* Partial_inplace. */ 85 0xffffffff, /* Src_mask. */ 86 0xffffffff, /* Dst_mask. */ 87 FALSE), /* PCrel_offset. */ 88 89 /* A 26 bit absolute branch, right shifted by 2. */ 90 HOWTO (R_ARC_B26, /* Type. */ 91 2, /* Rightshift. */ 92 2, /* Size (0 = byte, 1 = short, 2 = long). */ 93 26, /* Bitsize. */ 94 FALSE, /* PC_relative. */ 95 0, /* Bitpos. */ 96 complain_overflow_bitfield, /* Complain_on_overflow. */ 97 bfd_elf_generic_reloc, /* Special_function. */ 98 "R_ARC_B26", /* Name. */ 99 TRUE, /* Partial_inplace. */ 100 0x00ffffff, /* Src_mask. */ 101 0x00ffffff, /* Dst_mask. */ 102 FALSE), /* PCrel_offset. */ 103 104 /* A relative 22 bit branch; bits 21-2 are stored in bits 26-7. */ 105 HOWTO (R_ARC_B22_PCREL, /* Type. */ 106 2, /* Rightshift. */ 107 2, /* Size (0 = byte, 1 = short, 2 = long). */ 108 22, /* Bitsize. */ 109 TRUE, /* PC_relative. */ 110 7, /* Bitpos. */ 111 complain_overflow_signed, /* Complain_on_overflow. */ 112 arc_elf_b22_pcrel, /* Special_function. */ 113 "R_ARC_B22_PCREL", /* Name. */ 114 TRUE, /* Partial_inplace. */ 115 0x07ffff80, /* Src_mask. */ 116 0x07ffff80, /* Dst_mask. */ 117 FALSE), /* PCrel_offset. */ 118}; 119 120/* Map BFD reloc types to ARC ELF reloc types. */ 121 122struct arc_reloc_map 123{ 124 bfd_reloc_code_real_type bfd_reloc_val; 125 unsigned char elf_reloc_val; 126}; 127 128static const struct arc_reloc_map arc_reloc_map[] = 129{ 130 { BFD_RELOC_NONE, R_ARC_NONE, }, 131 { BFD_RELOC_32, R_ARC_32 }, 132 { BFD_RELOC_CTOR, R_ARC_32 }, 133 { BFD_RELOC_ARC_B26, R_ARC_B26 }, 134 { BFD_RELOC_ARC_B22_PCREL, R_ARC_B22_PCREL }, 135}; 136 137static reloc_howto_type * 138bfd_elf32_bfd_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, 139 bfd_reloc_code_real_type code) 140{ 141 unsigned int i; 142 143 for (i = ARRAY_SIZE (arc_reloc_map); i--;) 144 if (arc_reloc_map[i].bfd_reloc_val == code) 145 return elf_arc_howto_table + arc_reloc_map[i].elf_reloc_val; 146 147 return NULL; 148} 149 150static reloc_howto_type * 151bfd_elf32_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, 152 const char *r_name) 153{ 154 unsigned int i; 155 156 for (i = 0; 157 i < sizeof (elf_arc_howto_table) / sizeof (elf_arc_howto_table[0]); 158 i++) 159 if (elf_arc_howto_table[i].name != NULL 160 && strcasecmp (elf_arc_howto_table[i].name, r_name) == 0) 161 return &elf_arc_howto_table[i]; 162 163 return NULL; 164} 165 166/* Set the howto pointer for an ARC ELF reloc. */ 167 168static void 169arc_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED, 170 arelent *cache_ptr, 171 Elf_Internal_Rela *dst) 172{ 173 unsigned int r_type; 174 175 r_type = ELF32_R_TYPE (dst->r_info); 176 BFD_ASSERT (r_type < (unsigned int) R_ARC_max); 177 cache_ptr->howto = &elf_arc_howto_table[r_type]; 178} 179 180/* Set the right machine number for an ARC ELF file. */ 181 182static bfd_boolean 183arc_elf_object_p (bfd *abfd) 184{ 185 unsigned int mach = bfd_mach_arc_6; 186 187 if (elf_elfheader(abfd)->e_machine == EM_ARC) 188 { 189 unsigned long arch = elf_elfheader (abfd)->e_flags & EF_ARC_MACH; 190 191 switch (arch) 192 { 193 case E_ARC_MACH_ARC5: 194 mach = bfd_mach_arc_5; 195 break; 196 default: 197 case E_ARC_MACH_ARC6: 198 mach = bfd_mach_arc_6; 199 break; 200 case E_ARC_MACH_ARC7: 201 mach = bfd_mach_arc_7; 202 break; 203 case E_ARC_MACH_ARC8: 204 mach = bfd_mach_arc_8; 205 break; 206 } 207 } 208 return bfd_default_set_arch_mach (abfd, bfd_arch_arc, mach); 209} 210 211/* The final processing done just before writing out an ARC ELF object file. 212 This gets the ARC architecture right based on the machine number. */ 213 214static void 215arc_elf_final_write_processing (bfd *abfd, 216 bfd_boolean linker ATTRIBUTE_UNUSED) 217{ 218 unsigned long val; 219 220 switch (bfd_get_mach (abfd)) 221 { 222 case bfd_mach_arc_5: 223 val = E_ARC_MACH_ARC5; 224 break; 225 default: 226 case bfd_mach_arc_6: 227 val = E_ARC_MACH_ARC6; 228 break; 229 case bfd_mach_arc_7: 230 val = E_ARC_MACH_ARC7; 231 break; 232 case bfd_mach_arc_8: 233 val = E_ARC_MACH_ARC8; 234 break; 235 } 236 elf_elfheader (abfd)->e_flags &=~ EF_ARC_MACH; 237 elf_elfheader (abfd)->e_flags |= val; 238} 239 240#define TARGET_LITTLE_SYM bfd_elf32_littlearc_vec 241#define TARGET_LITTLE_NAME "elf32-littlearc" 242#define TARGET_BIG_SYM bfd_elf32_bigarc_vec 243#define TARGET_BIG_NAME "elf32-bigarc" 244#define ELF_ARCH bfd_arch_arc 245#define ELF_MACHINE_CODE EM_ARC 246#define ELF_MAXPAGESIZE 0x1000 247 248#define elf_info_to_howto 0 249#define elf_info_to_howto_rel arc_info_to_howto_rel 250#define elf_backend_object_p arc_elf_object_p 251#define elf_backend_final_write_processing arc_elf_final_write_processing 252 253#include "elf32-target.h" 254