elf32-arc.c revision 104834
1/* ARC-specific support for 32-bit ELF 2 Copyright 1994, 1995, 1997, 1999, 2001 Free Software Foundation, Inc. 3 Contributed by Doug Evans (dje@cygnus.com). 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 2 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 19 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ 20 21#include "bfd.h" 22#include "sysdep.h" 23#include "libbfd.h" 24#include "elf-bfd.h" 25#include "elf/arc.h" 26#include "libiberty.h" 27 28static reloc_howto_type *bfd_elf32_bfd_reloc_type_lookup 29 PARAMS ((bfd *abfd, bfd_reloc_code_real_type code)); 30static void arc_info_to_howto_rel 31 PARAMS ((bfd *, arelent *, Elf32_Internal_Rel *)); 32static boolean arc_elf_object_p 33 PARAMS ((bfd *)); 34static void arc_elf_final_write_processing 35 PARAMS ((bfd *, boolean)); 36static bfd_reloc_status_type arc_elf_b22_pcrel 37 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **)); 38 39/* Try to minimize the amount of space occupied by relocation tables 40 on the ROM (not that the ROM won't be swamped by other ELF overhead). */ 41 42#define USE_REL 43 44static reloc_howto_type elf_arc_howto_table[] = 45{ 46 /* This reloc does nothing. */ 47 HOWTO (R_ARC_NONE, /* type */ 48 0, /* rightshift */ 49 2, /* size (0 = byte, 1 = short, 2 = long) */ 50 32, /* bitsize */ 51 false, /* pc_relative */ 52 0, /* bitpos */ 53 complain_overflow_bitfield, /* complain_on_overflow */ 54 bfd_elf_generic_reloc, /* special_function */ 55 "R_ARC_NONE", /* name */ 56 true, /* partial_inplace */ 57 0, /* src_mask */ 58 0, /* dst_mask */ 59 false), /* pcrel_offset */ 60 61 /* A standard 32 bit relocation. */ 62 HOWTO (R_ARC_32, /* type */ 63 0, /* rightshift */ 64 2, /* size (0 = byte, 1 = short, 2 = long) */ 65 32, /* bitsize */ 66 false, /* pc_relative */ 67 0, /* bitpos */ 68 complain_overflow_bitfield, /* complain_on_overflow */ 69 bfd_elf_generic_reloc, /* special_function */ 70 "R_ARC_32", /* name */ 71 true, /* partial_inplace */ 72 0xffffffff, /* src_mask */ 73 0xffffffff, /* dst_mask */ 74 false), /* pcrel_offset */ 75 76 /* A 26 bit absolute branch, right shifted by 2. */ 77 HOWTO (R_ARC_B26, /* type */ 78 2, /* rightshift */ 79 2, /* size (0 = byte, 1 = short, 2 = long) */ 80 26, /* bitsize */ 81 false, /* pc_relative */ 82 0, /* bitpos */ 83 complain_overflow_bitfield, /* complain_on_overflow */ 84 bfd_elf_generic_reloc, /* special_function */ 85 "R_ARC_B26", /* name */ 86 true, /* partial_inplace */ 87 0x00ffffff, /* src_mask */ 88 0x00ffffff, /* dst_mask */ 89 false), /* pcrel_offset */ 90 91 /* A relative 22 bit branch; bits 21-2 are stored in bits 26-7. */ 92 HOWTO (R_ARC_B22_PCREL, /* type */ 93 2, /* rightshift */ 94 2, /* size (0 = byte, 1 = short, 2 = long) */ 95 22, /* bitsize */ 96 true, /* pc_relative */ 97 7, /* bitpos */ 98 complain_overflow_signed, /* complain_on_overflow */ 99 arc_elf_b22_pcrel, /* special_function */ 100 "R_ARC_B22_PCREL", /* name */ 101 true, /* partial_inplace */ 102 0x07ffff80, /* src_mask */ 103 0x07ffff80, /* dst_mask */ 104 false), /* pcrel_offset */ 105}; 106 107/* Map BFD reloc types to ARC ELF reloc types. */ 108 109struct arc_reloc_map 110{ 111 bfd_reloc_code_real_type bfd_reloc_val; 112 unsigned char elf_reloc_val; 113}; 114 115static const struct arc_reloc_map arc_reloc_map[] = 116{ 117 { BFD_RELOC_NONE, R_ARC_NONE, }, 118 { BFD_RELOC_32, R_ARC_32 }, 119 { BFD_RELOC_CTOR, R_ARC_32 }, 120 { BFD_RELOC_ARC_B26, R_ARC_B26 }, 121 { BFD_RELOC_ARC_B22_PCREL, R_ARC_B22_PCREL }, 122}; 123 124static reloc_howto_type * 125bfd_elf32_bfd_reloc_type_lookup (abfd, code) 126 bfd *abfd ATTRIBUTE_UNUSED; 127 bfd_reloc_code_real_type code; 128{ 129 unsigned int i; 130 131 for (i = ARRAY_SIZE (arc_reloc_map); i--;) 132 if (arc_reloc_map[i].bfd_reloc_val == code) 133 return elf_arc_howto_table + arc_reloc_map[i].elf_reloc_val; 134 135 return NULL; 136} 137 138/* Set the howto pointer for an ARC ELF reloc. */ 139 140static void 141arc_info_to_howto_rel (abfd, cache_ptr, dst) 142 bfd *abfd ATTRIBUTE_UNUSED; 143 arelent *cache_ptr; 144 Elf32_Internal_Rel *dst; 145{ 146 unsigned int r_type; 147 148 r_type = ELF32_R_TYPE (dst->r_info); 149 BFD_ASSERT (r_type < (unsigned int) R_ARC_max); 150 cache_ptr->howto = &elf_arc_howto_table[r_type]; 151} 152 153/* Set the right machine number for an ARC ELF file. */ 154 155static boolean 156arc_elf_object_p (abfd) 157 bfd *abfd; 158{ 159 unsigned int mach = bfd_mach_arc_6; 160 161 if (elf_elfheader(abfd)->e_machine == EM_ARC) 162 { 163 unsigned long arch = elf_elfheader (abfd)->e_flags & EF_ARC_MACH; 164 165 switch (arch) 166 { 167 case E_ARC_MACH_ARC5: 168 mach = bfd_mach_arc_5; 169 break; 170 default: 171 case E_ARC_MACH_ARC6: 172 mach = bfd_mach_arc_6; 173 break; 174 case E_ARC_MACH_ARC7: 175 mach = bfd_mach_arc_7; 176 break; 177 case E_ARC_MACH_ARC8: 178 mach = bfd_mach_arc_8; 179 break; 180 } 181 } 182 return bfd_default_set_arch_mach (abfd, bfd_arch_arc, mach); 183} 184 185/* The final processing done just before writing out an ARC ELF object file. 186 This gets the ARC architecture right based on the machine number. */ 187 188static void 189arc_elf_final_write_processing (abfd, linker) 190 bfd *abfd; 191 boolean linker ATTRIBUTE_UNUSED; 192{ 193 unsigned long val; 194 195 switch (bfd_get_mach (abfd)) 196 { 197 case bfd_mach_arc_5: 198 val = E_ARC_MACH_ARC5; 199 break; 200 default: 201 case bfd_mach_arc_6: 202 val = E_ARC_MACH_ARC6; 203 break; 204 case bfd_mach_arc_7: 205 val = E_ARC_MACH_ARC7; 206 break; 207 case bfd_mach_arc_8: 208 val = E_ARC_MACH_ARC8; 209 break; 210 } 211 elf_elfheader (abfd)->e_flags &=~ EF_ARC_MACH; 212 elf_elfheader (abfd)->e_flags |= val; 213} 214 215bfd_reloc_status_type 216arc_elf_b22_pcrel (abfd, reloc_entry, symbol, data, input_section, 217 output_bfd, error_message) 218 bfd * abfd; 219 arelent * reloc_entry; 220 asymbol * symbol; 221 PTR data; 222 asection * input_section; 223 bfd * output_bfd; 224 char ** error_message; 225{ 226 /* If linking, back up the final symbol address by the address of the 227 reloc. This cannot be accomplished by setting the pcrel_offset 228 field to true, as bfd_install_relocation will detect this and refuse 229 to install the offset in the first place, but bfd_perform_relocation 230 will still insist on removing it. */ 231 if (output_bfd == (bfd *) NULL) 232 reloc_entry->addend -= reloc_entry->address; 233 234 /* Fall through to the default elf reloc handler. */ 235 return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, 236 input_section, output_bfd, error_message); 237} 238 239#define TARGET_LITTLE_SYM bfd_elf32_littlearc_vec 240#define TARGET_LITTLE_NAME "elf32-littlearc" 241#define TARGET_BIG_SYM bfd_elf32_bigarc_vec 242#define TARGET_BIG_NAME "elf32-bigarc" 243#define ELF_ARCH bfd_arch_arc 244#define ELF_MACHINE_CODE EM_ARC 245#define ELF_MAXPAGESIZE 0x1000 246 247#define elf_info_to_howto 0 248#define elf_info_to_howto_rel arc_info_to_howto_rel 249#define elf_backend_object_p arc_elf_object_p 250#define elf_backend_final_write_processing arc_elf_final_write_processing 251 252#include "elf32-target.h" 253