| 1 | /* picoJava specific support for 32-bit ELF |
| 2 | Copyright (C) 1999-2017 Free Software Foundation, Inc. |
| 3 | Contributed by Steve Chamberlan of Transmeta (sac@pobox.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 3 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., 51 Franklin Street - Fifth Floor, Boston, |
| 20 | MA 02110-1301, USA. */ |
| 21 | |
| 22 | #include "sysdep.h" |
| 23 | #include "bfd.h" |
| 24 | #include "bfdlink.h" |
| 25 | #include "libbfd.h" |
| 26 | #include "elf-bfd.h" |
| 27 | #include "elf/pj.h" |
| 28 | |
| 29 | /* This function is used for normal relocs. This is like the COFF |
| 30 | function, and is almost certainly incorrect for other ELF targets. */ |
| 31 | |
| 32 | static bfd_reloc_status_type |
| 33 | pj_elf_reloc (bfd *abfd, |
| 34 | arelent *reloc_entry, |
| 35 | asymbol *symbol_in, |
| 36 | void * data, |
| 37 | asection *input_section, |
| 38 | bfd *output_bfd, |
| 39 | char **error_message ATTRIBUTE_UNUSED) |
| 40 | { |
| 41 | unsigned long insn; |
| 42 | bfd_vma sym_value; |
| 43 | enum elf_pj_reloc_type r_type; |
| 44 | bfd_vma addr = reloc_entry->address; |
| 45 | bfd_byte *hit_data = addr + (bfd_byte *) data; |
| 46 | |
| 47 | r_type = (enum elf_pj_reloc_type) reloc_entry->howto->type; |
| 48 | |
| 49 | if (output_bfd != NULL) |
| 50 | { |
| 51 | /* Partial linking--do nothing. */ |
| 52 | reloc_entry->address += input_section->output_offset; |
| 53 | return bfd_reloc_ok; |
| 54 | } |
| 55 | |
| 56 | if (symbol_in != NULL |
| 57 | && bfd_is_und_section (symbol_in->section)) |
| 58 | return bfd_reloc_undefined; |
| 59 | |
| 60 | if (bfd_is_com_section (symbol_in->section)) |
| 61 | sym_value = 0; |
| 62 | else |
| 63 | sym_value = (symbol_in->value + |
| 64 | symbol_in->section->output_section->vma + |
| 65 | symbol_in->section->output_offset); |
| 66 | |
| 67 | switch (r_type) |
| 68 | { |
| 69 | case R_PJ_DATA_DIR32: |
| 70 | insn = bfd_get_32 (abfd, hit_data); |
| 71 | insn += sym_value + reloc_entry->addend; |
| 72 | bfd_put_32 (abfd, (bfd_vma) insn, hit_data); |
| 73 | break; |
| 74 | |
| 75 | /* Relocations in code are always bigendian, no matter what the |
| 76 | data endianness is. */ |
| 77 | |
| 78 | case R_PJ_CODE_DIR32: |
| 79 | insn = bfd_getb32 (hit_data); |
| 80 | insn += sym_value + reloc_entry->addend; |
| 81 | bfd_putb32 ((bfd_vma) insn, hit_data); |
| 82 | break; |
| 83 | |
| 84 | case R_PJ_CODE_REL16: |
| 85 | insn = bfd_getb16 (hit_data); |
| 86 | insn += sym_value + reloc_entry->addend |
| 87 | - (input_section->output_section->vma |
| 88 | + input_section->output_offset); |
| 89 | bfd_putb16 ((bfd_vma) insn, hit_data); |
| 90 | break; |
| 91 | case R_PJ_CODE_LO16: |
| 92 | insn = bfd_getb16 (hit_data); |
| 93 | insn += sym_value + reloc_entry->addend; |
| 94 | bfd_putb16 ((bfd_vma) insn, hit_data); |
| 95 | break; |
| 96 | |
| 97 | case R_PJ_CODE_HI16: |
| 98 | insn = bfd_getb16 (hit_data); |
| 99 | insn += (sym_value + reloc_entry->addend) >> 16; |
| 100 | bfd_putb16 ((bfd_vma) insn, hit_data); |
| 101 | break; |
| 102 | |
| 103 | default: |
| 104 | abort (); |
| 105 | break; |
| 106 | } |
| 107 | |
| 108 | return bfd_reloc_ok; |
| 109 | } |
| 110 | |
| 111 | static reloc_howto_type pj_elf_howto_table[] = |
| 112 | { |
| 113 | /* No relocation. */ |
| 114 | HOWTO (R_PJ_NONE, /* type */ |
| 115 | 0, /* rightshift */ |
| 116 | 3, /* size (0 = byte, 1 = short, 2 = long) */ |
| 117 | 0, /* bitsize */ |
| 118 | FALSE, /* pc_relative */ |
| 119 | 0, /* bitpos */ |
| 120 | complain_overflow_dont, /* complain_on_overflow */ |
| 121 | pj_elf_reloc, /* special_function */ |
| 122 | "R_PJ_NONE", /* name */ |
| 123 | FALSE, /* partial_inplace */ |
| 124 | 0, /* src_mask */ |
| 125 | 0, /* dst_mask */ |
| 126 | FALSE), /* pcrel_offset */ |
| 127 | |
| 128 | /* 32 bit absolute relocation. Setting partial_inplace to TRUE and |
| 129 | src_mask to a non-zero value is similar to the COFF toolchain. */ |
| 130 | HOWTO (R_PJ_DATA_DIR32, /* type */ |
| 131 | 0, /* rightshift */ |
| 132 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 133 | 32, /* bitsize */ |
| 134 | FALSE, /* pc_relative */ |
| 135 | 0, /* bitpos */ |
| 136 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 137 | pj_elf_reloc, /* special_function */ |
| 138 | "R_PJ_DIR32", /* name */ |
| 139 | TRUE, /* partial_inplace */ |
| 140 | 0xffffffff, /* src_mask */ |
| 141 | 0xffffffff, /* dst_mask */ |
| 142 | FALSE), /* pcrel_offset */ |
| 143 | |
| 144 | /* 32 bit PC relative relocation. */ |
| 145 | HOWTO (R_PJ_CODE_REL32, /* type */ |
| 146 | 0, /* rightshift */ |
| 147 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 148 | 32, /* bitsize */ |
| 149 | TRUE, /* pc_relative */ |
| 150 | 0, /* bitpos */ |
| 151 | complain_overflow_signed, /* complain_on_overflow */ |
| 152 | pj_elf_reloc, /* special_function */ |
| 153 | "R_PJ_REL32", /* name */ |
| 154 | FALSE, /* partial_inplace */ |
| 155 | 0, /* src_mask */ |
| 156 | 0xffffffff, /* dst_mask */ |
| 157 | TRUE), /* pcrel_offset */ |
| 158 | |
| 159 | /* 16 bit PC relative relocation. */ |
| 160 | HOWTO (R_PJ_CODE_REL16, /* type */ |
| 161 | 0, /* rightshift */ |
| 162 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 163 | 16, /* bitsize */ |
| 164 | TRUE, /* pc_relative */ |
| 165 | 0, /* bitpos */ |
| 166 | complain_overflow_signed, /* complain_on_overf6w */ |
| 167 | pj_elf_reloc, /* special_function */ |
| 168 | "R_PJ_REL16", /* name */ |
| 169 | FALSE, /* partial_inplace */ |
| 170 | 0xffff, /* src_mask */ |
| 171 | 0xffff, /* dst_mask */ |
| 172 | TRUE), /* pcrel_offset */ |
| 173 | EMPTY_HOWTO (4), |
| 174 | EMPTY_HOWTO (5), |
| 175 | HOWTO (R_PJ_CODE_DIR32, /* type */ |
| 176 | 0, /* rightshift */ |
| 177 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 178 | 32, /* bitsize */ |
| 179 | FALSE, /* pc_relative */ |
| 180 | 0, /* bitpos */ |
| 181 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 182 | pj_elf_reloc, /* special_function */ |
| 183 | "R_PJ_CODE_DIR32", /* name */ |
| 184 | TRUE, /* partial_inplace */ |
| 185 | 0xffffffff, /* src_mask */ |
| 186 | 0xffffffff, /* dst_mask */ |
| 187 | FALSE), /* pcrel_offset */ |
| 188 | |
| 189 | EMPTY_HOWTO (7), |
| 190 | EMPTY_HOWTO (8), |
| 191 | EMPTY_HOWTO (9), |
| 192 | EMPTY_HOWTO (10), |
| 193 | EMPTY_HOWTO (11), |
| 194 | EMPTY_HOWTO (12), |
| 195 | |
| 196 | HOWTO (R_PJ_CODE_LO16, /* type */ |
| 197 | 0, /* rightshift */ |
| 198 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 199 | 16, /* bitsize */ |
| 200 | FALSE, /* pc_relative */ |
| 201 | 0, /* bitpos */ |
| 202 | complain_overflow_unsigned, /* complain_on_overflow */ |
| 203 | pj_elf_reloc, /* special_function */ |
| 204 | "R_PJ_LO16", /* name */ |
| 205 | FALSE, /* partial_inplace */ |
| 206 | 0xffff, /* src_mask */ |
| 207 | 0xffff, /* dst_mask */ |
| 208 | TRUE), /* pcrel_offset */ |
| 209 | |
| 210 | HOWTO (R_PJ_CODE_HI16, /* type */ |
| 211 | 16, /* rightshift */ |
| 212 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 213 | 16, /* bitsize */ |
| 214 | FALSE, /* pc_relative */ |
| 215 | 0, /* bitpos */ |
| 216 | complain_overflow_unsigned, /* complain_on_overflow */ |
| 217 | pj_elf_reloc, /* special_function */ |
| 218 | "R_PJ_HI16", /* name */ |
| 219 | FALSE, /* partial_inplace */ |
| 220 | 0xffff, /* src_mask */ |
| 221 | 0xffff, /* dst_mask */ |
| 222 | TRUE), /* pcrel_offset */ |
| 223 | |
| 224 | /* GNU extension to record C++ vtable hierarchy. */ |
| 225 | HOWTO (R_PJ_GNU_VTINHERIT, /* type */ |
| 226 | 0, /* rightshift */ |
| 227 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 228 | 0, /* bitsize */ |
| 229 | FALSE, /* pc_relative */ |
| 230 | 0, /* bitpos */ |
| 231 | complain_overflow_dont, /* complain_on_overflow */ |
| 232 | NULL, /* special_function */ |
| 233 | "R_PJ_GNU_VTINHERIT", /* name */ |
| 234 | FALSE, /* partial_inplace */ |
| 235 | 0, /* src_mask */ |
| 236 | 0, /* dst_mask */ |
| 237 | FALSE), /* pcrel_offset */ |
| 238 | |
| 239 | /* GNU extension to record C++ vtable member usage. */ |
| 240 | HOWTO (R_PJ_GNU_VTENTRY, /* type */ |
| 241 | 0, /* rightshift */ |
| 242 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 243 | 0, /* bitsize */ |
| 244 | FALSE, /* pc_relative */ |
| 245 | 0, /* bitpos */ |
| 246 | complain_overflow_dont, /* complain_on_overflow */ |
| 247 | _bfd_elf_rel_vtable_reloc_fn, /* special_function */ |
| 248 | "R_PJ_GNU_VTENTRY", /* name */ |
| 249 | FALSE, /* partial_inplace */ |
| 250 | 0, /* src_mask */ |
| 251 | 0, /* dst_mask */ |
| 252 | FALSE), /* pcrel_offset */ |
| 253 | }; |
| 254 | |
| 255 | /* This structure is used to map BFD reloc codes to PJ ELF relocs. */ |
| 256 | |
| 257 | struct elf_reloc_map |
| 258 | { |
| 259 | bfd_reloc_code_real_type bfd_reloc_val; |
| 260 | unsigned char elf_reloc_val; |
| 261 | }; |
| 262 | |
| 263 | /* An array mapping BFD reloc codes to PJ ELF relocs. */ |
| 264 | |
| 265 | static const struct elf_reloc_map pj_reloc_map[] = |
| 266 | { |
| 267 | { BFD_RELOC_NONE, R_PJ_NONE }, |
| 268 | { BFD_RELOC_32, R_PJ_DATA_DIR32 }, |
| 269 | { BFD_RELOC_PJ_CODE_DIR16, R_PJ_CODE_DIR16 }, |
| 270 | { BFD_RELOC_PJ_CODE_DIR32, R_PJ_CODE_DIR32 }, |
| 271 | { BFD_RELOC_PJ_CODE_LO16, R_PJ_CODE_LO16 }, |
| 272 | { BFD_RELOC_PJ_CODE_HI16, R_PJ_CODE_HI16 }, |
| 273 | { BFD_RELOC_PJ_CODE_REL32, R_PJ_CODE_REL32 }, |
| 274 | { BFD_RELOC_PJ_CODE_REL16, R_PJ_CODE_REL16 }, |
| 275 | { BFD_RELOC_VTABLE_INHERIT, R_PJ_GNU_VTINHERIT }, |
| 276 | { BFD_RELOC_VTABLE_ENTRY, R_PJ_GNU_VTENTRY }, |
| 277 | }; |
| 278 | |
| 279 | /* Given a BFD reloc code, return the howto structure for the |
| 280 | corresponding PJ ELf reloc. */ |
| 281 | |
| 282 | static reloc_howto_type * |
| 283 | pj_elf_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, |
| 284 | bfd_reloc_code_real_type code) |
| 285 | { |
| 286 | unsigned int i; |
| 287 | |
| 288 | for (i = 0; i < sizeof (pj_reloc_map) / sizeof (struct elf_reloc_map); i++) |
| 289 | if (pj_reloc_map[i].bfd_reloc_val == code) |
| 290 | return & pj_elf_howto_table[(int) pj_reloc_map[i].elf_reloc_val]; |
| 291 | |
| 292 | return NULL; |
| 293 | } |
| 294 | |
| 295 | static reloc_howto_type * |
| 296 | pj_elf_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, |
| 297 | const char *r_name) |
| 298 | { |
| 299 | unsigned int i; |
| 300 | |
| 301 | for (i = 0; |
| 302 | i < sizeof (pj_elf_howto_table) / sizeof (pj_elf_howto_table[0]); |
| 303 | i++) |
| 304 | if (pj_elf_howto_table[i].name != NULL |
| 305 | && strcasecmp (pj_elf_howto_table[i].name, r_name) == 0) |
| 306 | return &pj_elf_howto_table[i]; |
| 307 | |
| 308 | return NULL; |
| 309 | } |
| 310 | |
| 311 | /* Given an ELF reloc, fill in the howto field of a relent. */ |
| 312 | |
| 313 | static void |
| 314 | pj_elf_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED, |
| 315 | arelent *cache_ptr, |
| 316 | Elf_Internal_Rela *dst) |
| 317 | { |
| 318 | unsigned int r; |
| 319 | |
| 320 | r = ELF32_R_TYPE (dst->r_info); |
| 321 | |
| 322 | if (r >= R_PJ_max) |
| 323 | { |
| 324 | /* xgettext:c-format */ |
| 325 | _bfd_error_handler (_("%B: unrecognised PicoJava reloc number: %d"), |
| 326 | abfd, r); |
| 327 | bfd_set_error (bfd_error_bad_value); |
| 328 | r = R_PJ_NONE; |
| 329 | } |
| 330 | |
| 331 | cache_ptr->howto = &pj_elf_howto_table[r]; |
| 332 | } |
| 333 | |
| 334 | /* Take this moment to fill in the special picoJava bits in the |
| 335 | e_flags field. */ |
| 336 | |
| 337 | static void |
| 338 | pj_elf_final_write_processing (bfd *abfd, |
| 339 | bfd_boolean linker ATTRIBUTE_UNUSED) |
| 340 | { |
| 341 | elf_elfheader (abfd)->e_flags |= EF_PICOJAVA_ARCH; |
| 342 | elf_elfheader (abfd)->e_flags |= EF_PICOJAVA_GNUCALLS; |
| 343 | } |
| 344 | |
| 345 | #define TARGET_BIG_SYM pj_elf32_vec |
| 346 | #define TARGET_BIG_NAME "elf32-pj" |
| 347 | #define TARGET_LITTLE_SYM pj_elf32_le_vec |
| 348 | #define TARGET_LITTLE_NAME "elf32-pjl" |
| 349 | #define ELF_ARCH bfd_arch_pj |
| 350 | #define ELF_MACHINE_CODE EM_PJ |
| 351 | #define ELF_MACHINE_ALT1 EM_PJ_OLD |
| 352 | #define ELF_MAXPAGESIZE 0x1000 |
| 353 | #define bfd_elf32_bfd_get_relocated_section_contents \ |
| 354 | bfd_generic_get_relocated_section_contents |
| 355 | #define bfd_elf32_bfd_reloc_type_lookup pj_elf_reloc_type_lookup |
| 356 | #define bfd_elf32_bfd_reloc_name_lookup pj_elf_reloc_name_lookup |
| 357 | #define elf_backend_final_write_processing pj_elf_final_write_processing |
| 358 | #define elf_info_to_howto pj_elf_info_to_howto |
| 359 | #include "elf32-target.h" |