1/* ARC-specific support for 32-bit ELF 2 Copyright 1994, 1995, 1997, 1999, 2001, 2002 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 2 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ 21 22#include "bfd.h" 23#include "sysdep.h" 24#include "libbfd.h" 25#include "elf-bfd.h" 26#include "elf/arc.h" 27#include "libiberty.h" 28 29static reloc_howto_type *bfd_elf32_bfd_reloc_type_lookup 30 PARAMS ((bfd *abfd, bfd_reloc_code_real_type code)); 31static void arc_info_to_howto_rel 32 PARAMS ((bfd *, arelent *, Elf_Internal_Rela *)); 33static bfd_boolean arc_elf_object_p 34 PARAMS ((bfd *)); 35static void arc_elf_final_write_processing 36 PARAMS ((bfd *, bfd_boolean)); 37static bfd_reloc_status_type arc_elf_b22_pcrel 38 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **)); 39 40/* Try to minimize the amount of space occupied by relocation tables 41 on the ROM (not that the ROM won't be swamped by other ELF overhead). */ 42 43#define USE_REL 1 44 45static reloc_howto_type elf_arc_howto_table[] = 46{ 47 /* This reloc does nothing. */ 48 HOWTO (R_ARC_NONE, /* type */ 49 0, /* rightshift */ 50 2, /* size (0 = byte, 1 = short, 2 = long) */ 51 32, /* bitsize */ 52 FALSE, /* pc_relative */ 53 0, /* bitpos */ 54 complain_overflow_bitfield, /* complain_on_overflow */ 55 bfd_elf_generic_reloc, /* special_function */ 56 "R_ARC_NONE", /* name */ 57 TRUE, /* partial_inplace */ 58 0, /* src_mask */ 59 0, /* dst_mask */ 60 FALSE), /* pcrel_offset */ 61 62 /* A standard 32 bit relocation. */ 63 HOWTO (R_ARC_32, /* type */ 64 0, /* rightshift */ 65 2, /* size (0 = byte, 1 = short, 2 = long) */ 66 32, /* bitsize */ 67 FALSE, /* pc_relative */ 68 0, /* bitpos */ 69 complain_overflow_bitfield, /* complain_on_overflow */ 70 bfd_elf_generic_reloc, /* special_function */ 71 "R_ARC_32", /* name */ 72 TRUE, /* partial_inplace */ 73 0xffffffff, /* src_mask */ 74 0xffffffff, /* dst_mask */ 75 FALSE), /* pcrel_offset */ 76 77 /* A 26 bit absolute branch, right shifted by 2. */ 78 HOWTO (R_ARC_B26, /* type */ 79 2, /* rightshift */ 80 2, /* size (0 = byte, 1 = short, 2 = long) */ 81 26, /* bitsize */ 82 FALSE, /* pc_relative */ 83 0, /* bitpos */ 84 complain_overflow_bitfield, /* complain_on_overflow */ 85 bfd_elf_generic_reloc, /* special_function */ 86 "R_ARC_B26", /* name */ 87 TRUE, /* partial_inplace */ 88 0x00ffffff, /* src_mask */ 89 0x00ffffff, /* dst_mask */ 90 FALSE), /* pcrel_offset */ 91 92 /* A relative 22 bit branch; bits 21-2 are stored in bits 26-7. */ 93 HOWTO (R_ARC_B22_PCREL, /* type */ 94 2, /* rightshift */ 95 2, /* size (0 = byte, 1 = short, 2 = long) */ 96 22, /* bitsize */ 97 TRUE, /* pc_relative */ 98 7, /* bitpos */ 99 complain_overflow_signed, /* complain_on_overflow */ 100 arc_elf_b22_pcrel, /* special_function */ 101 "R_ARC_B22_PCREL", /* name */ 102 TRUE, /* partial_inplace */ 103 0x07ffff80, /* src_mask */ 104 0x07ffff80, /* dst_mask */ 105 FALSE), /* pcrel_offset */ 106}; 107 108/* Map BFD reloc types to ARC ELF reloc types. */ 109 110struct arc_reloc_map 111{ 112 bfd_reloc_code_real_type bfd_reloc_val; 113 unsigned char elf_reloc_val; 114}; 115 116static const struct arc_reloc_map arc_reloc_map[] = 117{ 118 { BFD_RELOC_NONE, R_ARC_NONE, }, 119 { BFD_RELOC_32, R_ARC_32 }, 120 { BFD_RELOC_CTOR, R_ARC_32 }, 121 { BFD_RELOC_ARC_B26, R_ARC_B26 }, 122 { BFD_RELOC_ARC_B22_PCREL, R_ARC_B22_PCREL }, 123}; 124 125static reloc_howto_type * 126bfd_elf32_bfd_reloc_type_lookup (abfd, code) 127 bfd *abfd ATTRIBUTE_UNUSED; 128 bfd_reloc_code_real_type code; 129{ 130 unsigned int i; 131 132 for (i = ARRAY_SIZE (arc_reloc_map); i--;) 133 if (arc_reloc_map[i].bfd_reloc_val == code) 134 return elf_arc_howto_table + arc_reloc_map[i].elf_reloc_val; 135 136 return NULL; 137} 138 139/* Set the howto pointer for an ARC ELF reloc. */ 140 141static void 142arc_info_to_howto_rel (abfd, cache_ptr, dst) 143 bfd *abfd ATTRIBUTE_UNUSED; 144 arelent *cache_ptr; 145 Elf_Internal_Rela *dst; 146{ 147 unsigned int r_type; 148 149 r_type = ELF32_R_TYPE (dst->r_info); 150 BFD_ASSERT (r_type < (unsigned int) R_ARC_max); 151 cache_ptr->howto = &elf_arc_howto_table[r_type]; 152} 153 154/* Set the right machine number for an ARC ELF file. */ 155 156static bfd_boolean 157arc_elf_object_p (abfd) 158 bfd *abfd; 159{ 160 unsigned int mach = bfd_mach_arc_6; 161 162 if (elf_elfheader(abfd)->e_machine == EM_ARC) 163 { 164 unsigned long arch = elf_elfheader (abfd)->e_flags & EF_ARC_MACH; 165 166 switch (arch) 167 { 168 case E_ARC_MACH_ARC5: 169 mach = bfd_mach_arc_5; 170 break; 171 default: 172 case E_ARC_MACH_ARC6: 173 mach = bfd_mach_arc_6; 174 break; 175 case E_ARC_MACH_ARC7: 176 mach = bfd_mach_arc_7; 177 break; 178 case E_ARC_MACH_ARC8: 179 mach = bfd_mach_arc_8; 180 break; 181 } 182 } 183 return bfd_default_set_arch_mach (abfd, bfd_arch_arc, mach); 184} 185 186/* The final processing done just before writing out an ARC ELF object file. 187 This gets the ARC architecture right based on the machine number. */ 188 189static void 190arc_elf_final_write_processing (abfd, linker) 191 bfd *abfd; 192 bfd_boolean linker ATTRIBUTE_UNUSED; 193{ 194 unsigned long val; 195 196 switch (bfd_get_mach (abfd)) 197 { 198 case bfd_mach_arc_5: 199 val = E_ARC_MACH_ARC5; 200 break; 201 default: 202 case bfd_mach_arc_6: 203 val = E_ARC_MACH_ARC6; 204 break; 205 case bfd_mach_arc_7: 206 val = E_ARC_MACH_ARC7; 207 break; 208 case bfd_mach_arc_8: 209 val = E_ARC_MACH_ARC8; 210 break; 211 } 212 elf_elfheader (abfd)->e_flags &=~ EF_ARC_MACH; 213 elf_elfheader (abfd)->e_flags |= val; 214} 215 216bfd_reloc_status_type 217arc_elf_b22_pcrel (abfd, reloc_entry, symbol, data, input_section, 218 output_bfd, error_message) 219 bfd * abfd; 220 arelent * reloc_entry; 221 asymbol * symbol; 222 PTR data; 223 asection * input_section; 224 bfd * output_bfd; 225 char ** error_message; 226{ 227 /* If linking, back up the final symbol address by the address of the 228 reloc. This cannot be accomplished by setting the pcrel_offset 229 field to TRUE, as bfd_install_relocation will detect this and refuse 230 to install the offset in the first place, but bfd_perform_relocation 231 will still insist on removing it. */ 232 if (output_bfd == (bfd *) NULL) 233 reloc_entry->addend -= reloc_entry->address; 234 235 /* Fall through to the default elf reloc handler. */ 236 return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, 237 input_section, output_bfd, error_message); 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