| 1 | /* BFD back-end for MIPS Extended-Coff files. |
| 2 | Copyright 1990, 1991, 1992, 1993 Free Software Foundation, Inc. |
| 3 | Original version by Per Bothner. |
| 4 | Full support added by Ian Lance Taylor, ian@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., 675 Mass Ave, Cambridge, MA 02139, USA. */ |
| 21 | |
| 22 | #include "bfd.h" |
| 23 | #include "sysdep.h" |
| 24 | #include "bfdlink.h" |
| 25 | #include "libbfd.h" |
| 26 | #include "coff/internal.h" |
| 27 | #include "coff/sym.h" |
| 28 | #include "coff/symconst.h" |
| 29 | #include "coff/ecoff.h" |
| 30 | #include "coff/mips.h" |
| 31 | #include "libcoff.h" |
| 32 | #include "libecoff.h" |
| 33 | \f |
| 34 | /* Prototypes for static functions. */ |
| 35 | |
| 36 | static boolean mips_ecoff_bad_format_hook PARAMS ((bfd *abfd, PTR filehdr)); |
| 37 | static void mips_ecoff_swap_reloc_in PARAMS ((bfd *, PTR, |
| 38 | struct internal_reloc *)); |
| 39 | static void mips_ecoff_swap_reloc_out PARAMS ((bfd *, |
| 40 | const struct internal_reloc *, |
| 41 | PTR)); |
| 42 | static void mips_adjust_reloc_in PARAMS ((bfd *, |
| 43 | const struct internal_reloc *, |
| 44 | arelent *)); |
| 45 | static void mips_adjust_reloc_out PARAMS ((bfd *, const arelent *, |
| 46 | struct internal_reloc *)); |
| 47 | static bfd_reloc_status_type mips_generic_reloc PARAMS ((bfd *abfd, |
| 48 | arelent *reloc, |
| 49 | asymbol *symbol, |
| 50 | PTR data, |
| 51 | asection *section, |
| 52 | bfd *output_bfd, |
| 53 | char **error)); |
| 54 | static bfd_reloc_status_type mips_refhi_reloc PARAMS ((bfd *abfd, |
| 55 | arelent *reloc, |
| 56 | asymbol *symbol, |
| 57 | PTR data, |
| 58 | asection *section, |
| 59 | bfd *output_bfd, |
| 60 | char **error)); |
| 61 | static bfd_reloc_status_type mips_reflo_reloc PARAMS ((bfd *abfd, |
| 62 | arelent *reloc, |
| 63 | asymbol *symbol, |
| 64 | PTR data, |
| 65 | asection *section, |
| 66 | bfd *output_bfd, |
| 67 | char **error)); |
| 68 | static bfd_reloc_status_type mips_gprel_reloc PARAMS ((bfd *abfd, |
| 69 | arelent *reloc, |
| 70 | asymbol *symbol, |
| 71 | PTR data, |
| 72 | asection *section, |
| 73 | bfd *output_bfd, |
| 74 | char **error)); |
| 75 | static void mips_relocate_refhi PARAMS ((struct internal_reloc *refhi, |
| 76 | struct internal_reloc *reflo, |
| 77 | bfd *input_bfd, |
| 78 | asection *input_section, |
| 79 | bfd_byte *contents, |
| 80 | size_t adjust, |
| 81 | bfd_vma relocation)); |
| 82 | static boolean mips_relocate_section PARAMS ((bfd *, struct bfd_link_info *, |
| 83 | bfd *, asection *, |
| 84 | bfd_byte *, PTR)); |
| 85 | static boolean mips_relax_section PARAMS ((bfd *, asection *, |
| 86 | struct bfd_link_info *, |
| 87 | boolean *)); |
| 88 | static boolean mips_relax_pcrel16 PARAMS ((struct bfd_link_info *, bfd *, |
| 89 | asection *, |
| 90 | struct ecoff_link_hash_entry *, |
| 91 | bfd_byte *, bfd_vma)); |
| 92 | \f |
| 93 | /* ECOFF has COFF sections, but the debugging information is stored in |
| 94 | a completely different format. ECOFF targets use some of the |
| 95 | swapping routines from coffswap.h, and some of the generic COFF |
| 96 | routines in coffgen.c, but, unlike the real COFF targets, do not |
| 97 | use coffcode.h itself. |
| 98 | |
| 99 | Get the generic COFF swapping routines, except for the reloc, |
| 100 | symbol, and lineno ones. Give them ECOFF names. */ |
| 101 | #define MIPSECOFF |
| 102 | #define NO_COFF_RELOCS |
| 103 | #define NO_COFF_SYMBOLS |
| 104 | #define NO_COFF_LINENOS |
| 105 | #define coff_swap_filehdr_in mips_ecoff_swap_filehdr_in |
| 106 | #define coff_swap_filehdr_out mips_ecoff_swap_filehdr_out |
| 107 | #define coff_swap_aouthdr_in mips_ecoff_swap_aouthdr_in |
| 108 | #define coff_swap_aouthdr_out mips_ecoff_swap_aouthdr_out |
| 109 | #define coff_swap_scnhdr_in mips_ecoff_swap_scnhdr_in |
| 110 | #define coff_swap_scnhdr_out mips_ecoff_swap_scnhdr_out |
| 111 | #include "coffswap.h" |
| 112 | |
| 113 | /* Get the ECOFF swapping routines. */ |
| 114 | #define ECOFF_32 |
| 115 | #include "ecoffswap.h" |
| 116 | \f |
| 117 | /* How to process the various relocs types. */ |
| 118 | |
| 119 | static reloc_howto_type mips_howto_table[] = |
| 120 | { |
| 121 | /* Reloc type 0 is ignored. The reloc reading code ensures that |
| 122 | this is a reference to the .abs section, which will cause |
| 123 | bfd_perform_relocation to do nothing. */ |
| 124 | HOWTO (MIPS_R_IGNORE, /* type */ |
| 125 | 0, /* rightshift */ |
| 126 | 0, /* size (0 = byte, 1 = short, 2 = long) */ |
| 127 | 8, /* bitsize */ |
| 128 | false, /* pc_relative */ |
| 129 | 0, /* bitpos */ |
| 130 | complain_overflow_dont, /* complain_on_overflow */ |
| 131 | 0, /* special_function */ |
| 132 | "IGNORE", /* name */ |
| 133 | false, /* partial_inplace */ |
| 134 | 0, /* src_mask */ |
| 135 | 0, /* dst_mask */ |
| 136 | false), /* pcrel_offset */ |
| 137 | |
| 138 | /* A 16 bit reference to a symbol, normally from a data section. */ |
| 139 | HOWTO (MIPS_R_REFHALF, /* type */ |
| 140 | 0, /* rightshift */ |
| 141 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 142 | 16, /* bitsize */ |
| 143 | false, /* pc_relative */ |
| 144 | 0, /* bitpos */ |
| 145 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 146 | mips_generic_reloc, /* special_function */ |
| 147 | "REFHALF", /* name */ |
| 148 | true, /* partial_inplace */ |
| 149 | 0xffff, /* src_mask */ |
| 150 | 0xffff, /* dst_mask */ |
| 151 | false), /* pcrel_offset */ |
| 152 | |
| 153 | /* A 32 bit reference to a symbol, normally from a data section. */ |
| 154 | HOWTO (MIPS_R_REFWORD, /* type */ |
| 155 | 0, /* rightshift */ |
| 156 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 157 | 32, /* bitsize */ |
| 158 | false, /* pc_relative */ |
| 159 | 0, /* bitpos */ |
| 160 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 161 | mips_generic_reloc, /* special_function */ |
| 162 | "REFWORD", /* name */ |
| 163 | true, /* partial_inplace */ |
| 164 | 0xffffffff, /* src_mask */ |
| 165 | 0xffffffff, /* dst_mask */ |
| 166 | false), /* pcrel_offset */ |
| 167 | |
| 168 | /* A 26 bit absolute jump address. */ |
| 169 | HOWTO (MIPS_R_JMPADDR, /* type */ |
| 170 | 2, /* rightshift */ |
| 171 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 172 | 26, /* bitsize */ |
| 173 | false, /* pc_relative */ |
| 174 | 0, /* bitpos */ |
| 175 | complain_overflow_dont, /* complain_on_overflow */ |
| 176 | /* This needs complex overflow |
| 177 | detection, because the upper four |
| 178 | bits must match the PC. */ |
| 179 | mips_generic_reloc, /* special_function */ |
| 180 | "JMPADDR", /* name */ |
| 181 | true, /* partial_inplace */ |
| 182 | 0x3ffffff, /* src_mask */ |
| 183 | 0x3ffffff, /* dst_mask */ |
| 184 | false), /* pcrel_offset */ |
| 185 | |
| 186 | /* The high 16 bits of a symbol value. Handled by the function |
| 187 | mips_refhi_reloc. */ |
| 188 | HOWTO (MIPS_R_REFHI, /* type */ |
| 189 | 16, /* rightshift */ |
| 190 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 191 | 16, /* bitsize */ |
| 192 | false, /* pc_relative */ |
| 193 | 0, /* bitpos */ |
| 194 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 195 | mips_refhi_reloc, /* special_function */ |
| 196 | "REFHI", /* name */ |
| 197 | true, /* partial_inplace */ |
| 198 | 0xffff, /* src_mask */ |
| 199 | 0xffff, /* dst_mask */ |
| 200 | false), /* pcrel_offset */ |
| 201 | |
| 202 | /* The low 16 bits of a symbol value. */ |
| 203 | HOWTO (MIPS_R_REFLO, /* type */ |
| 204 | 0, /* rightshift */ |
| 205 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 206 | 16, /* bitsize */ |
| 207 | false, /* pc_relative */ |
| 208 | 0, /* bitpos */ |
| 209 | complain_overflow_dont, /* complain_on_overflow */ |
| 210 | mips_reflo_reloc, /* special_function */ |
| 211 | "REFLO", /* name */ |
| 212 | true, /* partial_inplace */ |
| 213 | 0xffff, /* src_mask */ |
| 214 | 0xffff, /* dst_mask */ |
| 215 | false), /* pcrel_offset */ |
| 216 | |
| 217 | /* A reference to an offset from the gp register. Handled by the |
| 218 | function mips_gprel_reloc. */ |
| 219 | HOWTO (MIPS_R_GPREL, /* type */ |
| 220 | 0, /* rightshift */ |
| 221 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 222 | 16, /* bitsize */ |
| 223 | false, /* pc_relative */ |
| 224 | 0, /* bitpos */ |
| 225 | complain_overflow_signed, /* complain_on_overflow */ |
| 226 | mips_gprel_reloc, /* special_function */ |
| 227 | "GPREL", /* name */ |
| 228 | true, /* partial_inplace */ |
| 229 | 0xffff, /* src_mask */ |
| 230 | 0xffff, /* dst_mask */ |
| 231 | false), /* pcrel_offset */ |
| 232 | |
| 233 | /* A reference to a literal using an offset from the gp register. |
| 234 | Handled by the function mips_gprel_reloc. */ |
| 235 | HOWTO (MIPS_R_LITERAL, /* type */ |
| 236 | 0, /* rightshift */ |
| 237 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 238 | 16, /* bitsize */ |
| 239 | false, /* pc_relative */ |
| 240 | 0, /* bitpos */ |
| 241 | complain_overflow_signed, /* complain_on_overflow */ |
| 242 | mips_gprel_reloc, /* special_function */ |
| 243 | "LITERAL", /* name */ |
| 244 | true, /* partial_inplace */ |
| 245 | 0xffff, /* src_mask */ |
| 246 | 0xffff, /* dst_mask */ |
| 247 | false), /* pcrel_offset */ |
| 248 | |
| 249 | /* This reloc is a Cygnus extension used when generating position |
| 250 | independent code for embedded systems. It represents a 16 bit PC |
| 251 | relative reloc rightshifted twice as used in the MIPS branch |
| 252 | instructions. */ |
| 253 | HOWTO (MIPS_R_PCREL16, /* type */ |
| 254 | 2, /* rightshift */ |
| 255 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 256 | 16, /* bitsize */ |
| 257 | true, /* pc_relative */ |
| 258 | 0, /* bitpos */ |
| 259 | complain_overflow_signed, /* complain_on_overflow */ |
| 260 | mips_generic_reloc, /* special_function */ |
| 261 | "PCREL16", /* name */ |
| 262 | true, /* partial_inplace */ |
| 263 | 0xffff, /* src_mask */ |
| 264 | 0xffff, /* dst_mask */ |
| 265 | true) /* pcrel_offset */ |
| 266 | }; |
| 267 | |
| 268 | #define MIPS_HOWTO_COUNT \ |
| 269 | (sizeof mips_howto_table / sizeof mips_howto_table[0]) |
| 270 | |
| 271 | /* When the linker is doing relaxing, it may change a external PCREL16 |
| 272 | reloc. This typically represents an instruction like |
| 273 | bal foo |
| 274 | We change it to |
| 275 | .set noreorder |
| 276 | bal $L1 |
| 277 | lui $at,%hi(foo - $L1) |
| 278 | $L1: |
| 279 | addiu $at,%lo(foo - $L1) |
| 280 | addu $at,$at,$31 |
| 281 | jalr $at |
| 282 | PCREL16_EXPANSION_ADJUSTMENT is the number of bytes this changes the |
| 283 | instruction by. */ |
| 284 | |
| 285 | #define PCREL16_EXPANSION_ADJUSTMENT (4 * 4) |
| 286 | \f |
| 287 | /* See whether the magic number matches. */ |
| 288 | |
| 289 | static boolean |
| 290 | mips_ecoff_bad_format_hook (abfd, filehdr) |
| 291 | bfd *abfd; |
| 292 | PTR filehdr; |
| 293 | { |
| 294 | struct internal_filehdr *internal_f = (struct internal_filehdr *) filehdr; |
| 295 | |
| 296 | switch (internal_f->f_magic) |
| 297 | { |
| 298 | case MIPS_MAGIC_1: |
| 299 | /* I don't know what endianness this implies. */ |
| 300 | return true; |
| 301 | |
| 302 | case MIPS_MAGIC_BIG: |
| 303 | case MIPS_MAGIC_BIG2: |
| 304 | case MIPS_MAGIC_BIG3: |
| 305 | return abfd->xvec->byteorder_big_p; |
| 306 | |
| 307 | case MIPS_MAGIC_LITTLE: |
| 308 | case MIPS_MAGIC_LITTLE2: |
| 309 | case MIPS_MAGIC_LITTLE3: |
| 310 | return abfd->xvec->byteorder_big_p == false; |
| 311 | |
| 312 | default: |
| 313 | return false; |
| 314 | } |
| 315 | } |
| 316 | \f |
| 317 | /* Reloc handling. MIPS ECOFF relocs are packed into 8 bytes in |
| 318 | external form. They use a bit which indicates whether the symbol |
| 319 | is external. */ |
| 320 | |
| 321 | /* Swap a reloc in. */ |
| 322 | |
| 323 | static void |
| 324 | mips_ecoff_swap_reloc_in (abfd, ext_ptr, intern) |
| 325 | bfd *abfd; |
| 326 | PTR ext_ptr; |
| 327 | struct internal_reloc *intern; |
| 328 | { |
| 329 | const RELOC *ext = (RELOC *) ext_ptr; |
| 330 | |
| 331 | intern->r_vaddr = bfd_h_get_32 (abfd, (bfd_byte *) ext->r_vaddr); |
| 332 | if (abfd->xvec->header_byteorder_big_p != false) |
| 333 | { |
| 334 | intern->r_symndx = (((int) ext->r_bits[0] |
| 335 | << RELOC_BITS0_SYMNDX_SH_LEFT_BIG) |
| 336 | | ((int) ext->r_bits[1] |
| 337 | << RELOC_BITS1_SYMNDX_SH_LEFT_BIG) |
| 338 | | ((int) ext->r_bits[2] |
| 339 | << RELOC_BITS2_SYMNDX_SH_LEFT_BIG)); |
| 340 | intern->r_type = ((ext->r_bits[3] & RELOC_BITS3_TYPE_BIG) |
| 341 | >> RELOC_BITS3_TYPE_SH_BIG); |
| 342 | intern->r_extern = (ext->r_bits[3] & RELOC_BITS3_EXTERN_BIG) != 0; |
| 343 | } |
| 344 | else |
| 345 | { |
| 346 | intern->r_symndx = (((int) ext->r_bits[0] |
| 347 | << RELOC_BITS0_SYMNDX_SH_LEFT_LITTLE) |
| 348 | | ((int) ext->r_bits[1] |
| 349 | << RELOC_BITS1_SYMNDX_SH_LEFT_LITTLE) |
| 350 | | ((int) ext->r_bits[2] |
| 351 | << RELOC_BITS2_SYMNDX_SH_LEFT_LITTLE)); |
| 352 | intern->r_type = ((ext->r_bits[3] & RELOC_BITS3_TYPE_LITTLE) |
| 353 | >> RELOC_BITS3_TYPE_SH_LITTLE); |
| 354 | intern->r_extern = (ext->r_bits[3] & RELOC_BITS3_EXTERN_LITTLE) != 0; |
| 355 | } |
| 356 | } |
| 357 | |
| 358 | /* Swap a reloc out. */ |
| 359 | |
| 360 | static void |
| 361 | mips_ecoff_swap_reloc_out (abfd, intern, dst) |
| 362 | bfd *abfd; |
| 363 | const struct internal_reloc *intern; |
| 364 | PTR dst; |
| 365 | { |
| 366 | RELOC *ext = (RELOC *) dst; |
| 367 | |
| 368 | BFD_ASSERT (intern->r_extern |
| 369 | || (intern->r_symndx >= 0 && intern->r_symndx <= 12)); |
| 370 | |
| 371 | bfd_h_put_32 (abfd, intern->r_vaddr, (bfd_byte *) ext->r_vaddr); |
| 372 | if (abfd->xvec->header_byteorder_big_p != false) |
| 373 | { |
| 374 | ext->r_bits[0] = intern->r_symndx >> RELOC_BITS0_SYMNDX_SH_LEFT_BIG; |
| 375 | ext->r_bits[1] = intern->r_symndx >> RELOC_BITS1_SYMNDX_SH_LEFT_BIG; |
| 376 | ext->r_bits[2] = intern->r_symndx >> RELOC_BITS2_SYMNDX_SH_LEFT_BIG; |
| 377 | ext->r_bits[3] = (((intern->r_type << RELOC_BITS3_TYPE_SH_BIG) |
| 378 | & RELOC_BITS3_TYPE_BIG) |
| 379 | | (intern->r_extern ? RELOC_BITS3_EXTERN_BIG : 0)); |
| 380 | } |
| 381 | else |
| 382 | { |
| 383 | ext->r_bits[0] = intern->r_symndx >> RELOC_BITS0_SYMNDX_SH_LEFT_LITTLE; |
| 384 | ext->r_bits[1] = intern->r_symndx >> RELOC_BITS1_SYMNDX_SH_LEFT_LITTLE; |
| 385 | ext->r_bits[2] = intern->r_symndx >> RELOC_BITS2_SYMNDX_SH_LEFT_LITTLE; |
| 386 | ext->r_bits[3] = (((intern->r_type << RELOC_BITS3_TYPE_SH_LITTLE) |
| 387 | & RELOC_BITS3_TYPE_LITTLE) |
| 388 | | (intern->r_extern ? RELOC_BITS3_EXTERN_LITTLE : 0)); |
| 389 | } |
| 390 | } |
| 391 | |
| 392 | /* Finish canonicalizing a reloc. Part of this is generic to all |
| 393 | ECOFF targets, and that part is in ecoff.c. The rest is done in |
| 394 | this backend routine. It must fill in the howto field. */ |
| 395 | |
| 396 | static void |
| 397 | mips_adjust_reloc_in (abfd, intern, rptr) |
| 398 | bfd *abfd; |
| 399 | const struct internal_reloc *intern; |
| 400 | arelent *rptr; |
| 401 | { |
| 402 | if (intern->r_type > MIPS_R_PCREL16) |
| 403 | abort (); |
| 404 | |
| 405 | if (! intern->r_extern |
| 406 | && (intern->r_type == MIPS_R_GPREL |
| 407 | || intern->r_type == MIPS_R_LITERAL)) |
| 408 | rptr->addend += ecoff_data (abfd)->gp; |
| 409 | |
| 410 | /* If the type is MIPS_R_IGNORE, make sure this is a reference to |
| 411 | the absolute section so that the reloc is ignored. */ |
| 412 | if (intern->r_type == MIPS_R_IGNORE) |
| 413 | rptr->sym_ptr_ptr = bfd_abs_section.symbol_ptr_ptr; |
| 414 | |
| 415 | rptr->howto = &mips_howto_table[intern->r_type]; |
| 416 | } |
| 417 | |
| 418 | /* Make any adjustments needed to a reloc before writing it out. None |
| 419 | are needed for MIPS. */ |
| 420 | |
| 421 | static void |
| 422 | mips_adjust_reloc_out (abfd, rel, intern) |
| 423 | bfd *abfd; |
| 424 | const arelent *rel; |
| 425 | struct internal_reloc *intern; |
| 426 | { |
| 427 | } |
| 428 | |
| 429 | /* ECOFF relocs are either against external symbols, or against |
| 430 | sections. If we are producing relocateable output, and the reloc |
| 431 | is against an external symbol, and nothing has given us any |
| 432 | additional addend, the resulting reloc will also be against the |
| 433 | same symbol. In such a case, we don't want to change anything |
| 434 | about the way the reloc is handled, since it will all be done at |
| 435 | final link time. Rather than put special case code into |
| 436 | bfd_perform_relocation, all the reloc types use this howto |
| 437 | function. It just short circuits the reloc if producing |
| 438 | relocateable output against an external symbol. */ |
| 439 | |
| 440 | static bfd_reloc_status_type |
| 441 | mips_generic_reloc (abfd, |
| 442 | reloc_entry, |
| 443 | symbol, |
| 444 | data, |
| 445 | input_section, |
| 446 | output_bfd, |
| 447 | error_message) |
| 448 | bfd *abfd; |
| 449 | arelent *reloc_entry; |
| 450 | asymbol *symbol; |
| 451 | PTR data; |
| 452 | asection *input_section; |
| 453 | bfd *output_bfd; |
| 454 | char **error_message; |
| 455 | { |
| 456 | if (output_bfd != (bfd *) NULL |
| 457 | && (symbol->flags & BSF_SECTION_SYM) == 0 |
| 458 | && reloc_entry->addend == 0) |
| 459 | { |
| 460 | reloc_entry->address += input_section->output_offset; |
| 461 | return bfd_reloc_ok; |
| 462 | } |
| 463 | |
| 464 | return bfd_reloc_continue; |
| 465 | } |
| 466 | |
| 467 | /* Do a REFHI relocation. This has to be done in combination with a |
| 468 | REFLO reloc, because there is a carry from the REFLO to the REFHI. |
| 469 | Here we just save the information we need; we do the actual |
| 470 | relocation when we see the REFLO. MIPS ECOFF requires that the |
| 471 | REFLO immediately follow the REFHI, so this ought to work. */ |
| 472 | |
| 473 | static bfd_byte *mips_refhi_addr; |
| 474 | static bfd_vma mips_refhi_addend; |
| 475 | |
| 476 | static bfd_reloc_status_type |
| 477 | mips_refhi_reloc (abfd, |
| 478 | reloc_entry, |
| 479 | symbol, |
| 480 | data, |
| 481 | input_section, |
| 482 | output_bfd, |
| 483 | error_message) |
| 484 | bfd *abfd; |
| 485 | arelent *reloc_entry; |
| 486 | asymbol *symbol; |
| 487 | PTR data; |
| 488 | asection *input_section; |
| 489 | bfd *output_bfd; |
| 490 | char **error_message; |
| 491 | { |
| 492 | bfd_reloc_status_type ret; |
| 493 | bfd_vma relocation; |
| 494 | |
| 495 | /* If we're relocating, and this an external symbol, we don't want |
| 496 | to change anything. */ |
| 497 | if (output_bfd != (bfd *) NULL |
| 498 | && (symbol->flags & BSF_SECTION_SYM) == 0 |
| 499 | && reloc_entry->addend == 0) |
| 500 | { |
| 501 | reloc_entry->address += input_section->output_offset; |
| 502 | return bfd_reloc_ok; |
| 503 | } |
| 504 | |
| 505 | ret = bfd_reloc_ok; |
| 506 | if (symbol->section == &bfd_und_section |
| 507 | && output_bfd == (bfd *) NULL) |
| 508 | ret = bfd_reloc_undefined; |
| 509 | |
| 510 | if (bfd_is_com_section (symbol->section)) |
| 511 | relocation = 0; |
| 512 | else |
| 513 | relocation = symbol->value; |
| 514 | |
| 515 | relocation += symbol->section->output_section->vma; |
| 516 | relocation += symbol->section->output_offset; |
| 517 | relocation += reloc_entry->addend; |
| 518 | |
| 519 | if (reloc_entry->address > input_section->_cooked_size) |
| 520 | return bfd_reloc_outofrange; |
| 521 | |
| 522 | /* Save the information, and let REFLO do the actual relocation. */ |
| 523 | mips_refhi_addr = (bfd_byte *) data + reloc_entry->address; |
| 524 | mips_refhi_addend = relocation; |
| 525 | |
| 526 | if (output_bfd != (bfd *) NULL) |
| 527 | reloc_entry->address += input_section->output_offset; |
| 528 | |
| 529 | return ret; |
| 530 | } |
| 531 | |
| 532 | /* Do a REFLO relocation. This is a straightforward 16 bit inplace |
| 533 | relocation; this function exists in order to do the REFHI |
| 534 | relocation described above. */ |
| 535 | |
| 536 | static bfd_reloc_status_type |
| 537 | mips_reflo_reloc (abfd, |
| 538 | reloc_entry, |
| 539 | symbol, |
| 540 | data, |
| 541 | input_section, |
| 542 | output_bfd, |
| 543 | error_message) |
| 544 | bfd *abfd; |
| 545 | arelent *reloc_entry; |
| 546 | asymbol *symbol; |
| 547 | PTR data; |
| 548 | asection *input_section; |
| 549 | bfd *output_bfd; |
| 550 | char **error_message; |
| 551 | { |
| 552 | if (mips_refhi_addr != (bfd_byte *) NULL) |
| 553 | { |
| 554 | unsigned long insn; |
| 555 | unsigned long val; |
| 556 | unsigned long vallo; |
| 557 | |
| 558 | /* Do the REFHI relocation. Note that we actually don't need to |
| 559 | know anything about the REFLO itself, except where to find |
| 560 | the low 16 bits of the addend needed by the REFHI. */ |
| 561 | insn = bfd_get_32 (abfd, mips_refhi_addr); |
| 562 | vallo = (bfd_get_32 (abfd, (bfd_byte *) data + reloc_entry->address) |
| 563 | & 0xffff); |
| 564 | val = ((insn & 0xffff) << 16) + vallo; |
| 565 | val += mips_refhi_addend; |
| 566 | |
| 567 | /* The low order 16 bits are always treated as a signed value. |
| 568 | Therefore, a negative value in the low order bits requires an |
| 569 | adjustment in the high order bits. We need to make this |
| 570 | adjustment in two ways: once for the bits we took from the |
| 571 | data, and once for the bits we are putting back in to the |
| 572 | data. */ |
| 573 | if ((vallo & 0x8000) != 0) |
| 574 | val -= 0x10000; |
| 575 | if ((val & 0x8000) != 0) |
| 576 | val += 0x10000; |
| 577 | |
| 578 | insn = (insn &~ 0xffff) | ((val >> 16) & 0xffff); |
| 579 | bfd_put_32 (abfd, insn, mips_refhi_addr); |
| 580 | |
| 581 | mips_refhi_addr = (bfd_byte *) NULL; |
| 582 | } |
| 583 | |
| 584 | /* Now do the REFLO reloc in the usual way. */ |
| 585 | return mips_generic_reloc (abfd, reloc_entry, symbol, data, |
| 586 | input_section, output_bfd, error_message); |
| 587 | } |
| 588 | |
| 589 | /* Do a GPREL relocation. This is a 16 bit value which must become |
| 590 | the offset from the gp register. */ |
| 591 | |
| 592 | static bfd_reloc_status_type |
| 593 | mips_gprel_reloc (abfd, |
| 594 | reloc_entry, |
| 595 | symbol, |
| 596 | data, |
| 597 | input_section, |
| 598 | output_bfd, |
| 599 | error_message) |
| 600 | bfd *abfd; |
| 601 | arelent *reloc_entry; |
| 602 | asymbol *symbol; |
| 603 | PTR data; |
| 604 | asection *input_section; |
| 605 | bfd *output_bfd; |
| 606 | char **error_message; |
| 607 | { |
| 608 | boolean relocateable; |
| 609 | bfd_vma relocation; |
| 610 | unsigned long val; |
| 611 | unsigned long insn; |
| 612 | |
| 613 | /* If we're relocating, and this is an external symbol with no |
| 614 | addend, we don't want to change anything. We will only have an |
| 615 | addend if this is a newly created reloc, not read from an ECOFF |
| 616 | file. */ |
| 617 | if (output_bfd != (bfd *) NULL |
| 618 | && (symbol->flags & BSF_SECTION_SYM) == 0 |
| 619 | && reloc_entry->addend == 0) |
| 620 | { |
| 621 | reloc_entry->address += input_section->output_offset; |
| 622 | return bfd_reloc_ok; |
| 623 | } |
| 624 | |
| 625 | if (output_bfd != (bfd *) NULL) |
| 626 | relocateable = true; |
| 627 | else |
| 628 | { |
| 629 | relocateable = false; |
| 630 | output_bfd = symbol->section->output_section->owner; |
| 631 | } |
| 632 | |
| 633 | if (symbol->section == &bfd_und_section |
| 634 | && relocateable == false) |
| 635 | return bfd_reloc_undefined; |
| 636 | |
| 637 | /* We have to figure out the gp value, so that we can adjust the |
| 638 | symbol value correctly. We look up the symbol _gp in the output |
| 639 | BFD. If we can't find it, we're stuck. We cache it in the ECOFF |
| 640 | target data. We don't need to adjust the symbol value for an |
| 641 | external symbol if we are producing relocateable output. */ |
| 642 | if (ecoff_data (output_bfd)->gp == 0 |
| 643 | && (relocateable == false |
| 644 | || (symbol->flags & BSF_SECTION_SYM) != 0)) |
| 645 | { |
| 646 | if (relocateable != false) |
| 647 | { |
| 648 | /* Make up a value. */ |
| 649 | ecoff_data (output_bfd)->gp = |
| 650 | symbol->section->output_section->vma + 0x4000; |
| 651 | } |
| 652 | else |
| 653 | { |
| 654 | unsigned int count; |
| 655 | asymbol **sym; |
| 656 | unsigned int i; |
| 657 | |
| 658 | count = bfd_get_symcount (output_bfd); |
| 659 | sym = bfd_get_outsymbols (output_bfd); |
| 660 | |
| 661 | if (sym == (asymbol **) NULL) |
| 662 | i = count; |
| 663 | else |
| 664 | { |
| 665 | for (i = 0; i < count; i++, sym++) |
| 666 | { |
| 667 | register CONST char *name; |
| 668 | |
| 669 | name = bfd_asymbol_name (*sym); |
| 670 | if (*name == '_' && strcmp (name, "_gp") == 0) |
| 671 | { |
| 672 | ecoff_data (output_bfd)->gp = bfd_asymbol_value (*sym); |
| 673 | break; |
| 674 | } |
| 675 | } |
| 676 | } |
| 677 | |
| 678 | if (i >= count) |
| 679 | { |
| 680 | /* Only get the error once. */ |
| 681 | ecoff_data (output_bfd)->gp = 4; |
| 682 | *error_message = |
| 683 | (char *) "GP relative relocation when _gp not defined"; |
| 684 | return bfd_reloc_dangerous; |
| 685 | } |
| 686 | } |
| 687 | } |
| 688 | |
| 689 | if (bfd_is_com_section (symbol->section)) |
| 690 | relocation = 0; |
| 691 | else |
| 692 | relocation = symbol->value; |
| 693 | |
| 694 | relocation += symbol->section->output_section->vma; |
| 695 | relocation += symbol->section->output_offset; |
| 696 | |
| 697 | if (reloc_entry->address > input_section->_cooked_size) |
| 698 | return bfd_reloc_outofrange; |
| 699 | |
| 700 | insn = bfd_get_32 (abfd, (bfd_byte *) data + reloc_entry->address); |
| 701 | |
| 702 | /* Set val to the offset into the section or symbol. */ |
| 703 | val = ((insn & 0xffff) + reloc_entry->addend) & 0xffff; |
| 704 | if (val & 0x8000) |
| 705 | val -= 0x10000; |
| 706 | |
| 707 | /* Adjust val for the final section location and GP value. If we |
| 708 | are producing relocateable output, we don't want to do this for |
| 709 | an external symbol. */ |
| 710 | if (relocateable == false |
| 711 | || (symbol->flags & BSF_SECTION_SYM) != 0) |
| 712 | val += relocation - ecoff_data (output_bfd)->gp; |
| 713 | |
| 714 | insn = (insn &~ 0xffff) | (val & 0xffff); |
| 715 | bfd_put_32 (abfd, insn, (bfd_byte *) data + reloc_entry->address); |
| 716 | |
| 717 | if (relocateable != false) |
| 718 | reloc_entry->address += input_section->output_offset; |
| 719 | |
| 720 | /* Make sure it fit in 16 bits. */ |
| 721 | if (val >= 0x8000 && val < 0xffff8000) |
| 722 | return bfd_reloc_overflow; |
| 723 | |
| 724 | return bfd_reloc_ok; |
| 725 | } |
| 726 | |
| 727 | /* Get the howto structure for a generic reloc type. */ |
| 728 | |
| 729 | static CONST struct reloc_howto_struct * |
| 730 | mips_bfd_reloc_type_lookup (abfd, code) |
| 731 | bfd *abfd; |
| 732 | bfd_reloc_code_real_type code; |
| 733 | { |
| 734 | int mips_type; |
| 735 | |
| 736 | switch (code) |
| 737 | { |
| 738 | case BFD_RELOC_16: |
| 739 | mips_type = MIPS_R_REFHALF; |
| 740 | break; |
| 741 | case BFD_RELOC_32: |
| 742 | case BFD_RELOC_CTOR: |
| 743 | mips_type = MIPS_R_REFWORD; |
| 744 | break; |
| 745 | case BFD_RELOC_MIPS_JMP: |
| 746 | mips_type = MIPS_R_JMPADDR; |
| 747 | break; |
| 748 | case BFD_RELOC_HI16_S: |
| 749 | mips_type = MIPS_R_REFHI; |
| 750 | break; |
| 751 | case BFD_RELOC_LO16: |
| 752 | mips_type = MIPS_R_REFLO; |
| 753 | break; |
| 754 | case BFD_RELOC_MIPS_GPREL: |
| 755 | mips_type = MIPS_R_GPREL; |
| 756 | break; |
| 757 | case BFD_RELOC_MIPS_LITERAL: |
| 758 | mips_type = MIPS_R_LITERAL; |
| 759 | break; |
| 760 | case BFD_RELOC_16_PCREL_S2: |
| 761 | mips_type = MIPS_R_PCREL16; |
| 762 | break; |
| 763 | default: |
| 764 | return (CONST struct reloc_howto_struct *) NULL; |
| 765 | } |
| 766 | |
| 767 | return &mips_howto_table[mips_type]; |
| 768 | } |
| 769 | \f |
| 770 | /* A helper routine for mips_relocate_section which handles the REFHI |
| 771 | relocation. The REFHI relocation must be followed by a REFLO |
| 772 | relocation, and the addend used is formed from the addends of both |
| 773 | instructions. */ |
| 774 | |
| 775 | static void |
| 776 | mips_relocate_refhi (refhi, reflo, input_bfd, input_section, contents, |
| 777 | adjust, relocation) |
| 778 | struct internal_reloc *refhi; |
| 779 | struct internal_reloc *reflo; |
| 780 | bfd *input_bfd; |
| 781 | asection *input_section; |
| 782 | bfd_byte *contents; |
| 783 | size_t adjust; |
| 784 | bfd_vma relocation; |
| 785 | { |
| 786 | unsigned long insn; |
| 787 | unsigned long val; |
| 788 | unsigned long vallo; |
| 789 | |
| 790 | insn = bfd_get_32 (input_bfd, |
| 791 | contents + adjust + refhi->r_vaddr - input_section->vma); |
| 792 | vallo = (bfd_get_32 (input_bfd, |
| 793 | contents + adjust + reflo->r_vaddr - input_section->vma) |
| 794 | & 0xffff); |
| 795 | val = ((insn & 0xffff) << 16) + vallo; |
| 796 | val += relocation; |
| 797 | |
| 798 | /* The low order 16 bits are always treated as a signed value. |
| 799 | Therefore, a negative value in the low order bits requires an |
| 800 | adjustment in the high order bits. We need to make this |
| 801 | adjustment in two ways: once for the bits we took from the data, |
| 802 | and once for the bits we are putting back in to the data. */ |
| 803 | if ((vallo & 0x8000) != 0) |
| 804 | val -= 0x10000; |
| 805 | if ((val & 0x8000) != 0) |
| 806 | val += 0x10000; |
| 807 | |
| 808 | insn = (insn &~ 0xffff) | ((val >> 16) & 0xffff); |
| 809 | bfd_put_32 (input_bfd, (bfd_vma) insn, |
| 810 | contents + adjust + refhi->r_vaddr - input_section->vma); |
| 811 | } |
| 812 | |
| 813 | /* Relocate a section while linking a MIPS ECOFF file. */ |
| 814 | |
| 815 | static boolean |
| 816 | mips_relocate_section (output_bfd, info, input_bfd, input_section, |
| 817 | contents, external_relocs) |
| 818 | bfd *output_bfd; |
| 819 | struct bfd_link_info *info; |
| 820 | bfd *input_bfd; |
| 821 | asection *input_section; |
| 822 | bfd_byte *contents; |
| 823 | PTR external_relocs; |
| 824 | { |
| 825 | asection **symndx_to_section; |
| 826 | struct ecoff_link_hash_entry **sym_hashes; |
| 827 | bfd_vma gp; |
| 828 | boolean gp_undefined; |
| 829 | size_t adjust; |
| 830 | long *offsets; |
| 831 | struct external_reloc *ext_rel; |
| 832 | struct external_reloc *ext_rel_end; |
| 833 | unsigned int i; |
| 834 | boolean got_reflo; |
| 835 | struct internal_reloc reflo_int_rel; |
| 836 | |
| 837 | BFD_ASSERT (input_bfd->xvec->header_byteorder_big_p |
| 838 | == output_bfd->xvec->header_byteorder_big_p); |
| 839 | |
| 840 | /* We keep a table mapping the symndx found in an internal reloc to |
| 841 | the appropriate section. This is faster than looking up the |
| 842 | section by name each time. */ |
| 843 | symndx_to_section = ecoff_data (input_bfd)->symndx_to_section; |
| 844 | if (symndx_to_section == (asection **) NULL) |
| 845 | { |
| 846 | symndx_to_section = ((asection **) |
| 847 | bfd_alloc (input_bfd, |
| 848 | (NUM_RELOC_SECTIONS |
| 849 | * sizeof (asection *)))); |
| 850 | if (!symndx_to_section) |
| 851 | { |
| 852 | bfd_set_error (bfd_error_no_memory); |
| 853 | return false; |
| 854 | } |
| 855 | |
| 856 | symndx_to_section[RELOC_SECTION_NONE] = NULL; |
| 857 | symndx_to_section[RELOC_SECTION_TEXT] = |
| 858 | bfd_get_section_by_name (input_bfd, ".text"); |
| 859 | symndx_to_section[RELOC_SECTION_RDATA] = |
| 860 | bfd_get_section_by_name (input_bfd, ".rdata"); |
| 861 | symndx_to_section[RELOC_SECTION_DATA] = |
| 862 | bfd_get_section_by_name (input_bfd, ".data"); |
| 863 | symndx_to_section[RELOC_SECTION_SDATA] = |
| 864 | bfd_get_section_by_name (input_bfd, ".sdata"); |
| 865 | symndx_to_section[RELOC_SECTION_SBSS] = |
| 866 | bfd_get_section_by_name (input_bfd, ".sbss"); |
| 867 | symndx_to_section[RELOC_SECTION_BSS] = |
| 868 | bfd_get_section_by_name (input_bfd, ".bss"); |
| 869 | symndx_to_section[RELOC_SECTION_INIT] = |
| 870 | bfd_get_section_by_name (input_bfd, ".init"); |
| 871 | symndx_to_section[RELOC_SECTION_LIT8] = |
| 872 | bfd_get_section_by_name (input_bfd, ".lit8"); |
| 873 | symndx_to_section[RELOC_SECTION_LIT4] = |
| 874 | bfd_get_section_by_name (input_bfd, ".lit4"); |
| 875 | symndx_to_section[RELOC_SECTION_XDATA] = NULL; |
| 876 | symndx_to_section[RELOC_SECTION_PDATA] = NULL; |
| 877 | symndx_to_section[RELOC_SECTION_FINI] = |
| 878 | bfd_get_section_by_name (input_bfd, ".fini"); |
| 879 | symndx_to_section[RELOC_SECTION_LITA] = NULL; |
| 880 | symndx_to_section[RELOC_SECTION_ABS] = NULL; |
| 881 | |
| 882 | ecoff_data (input_bfd)->symndx_to_section = symndx_to_section; |
| 883 | } |
| 884 | |
| 885 | sym_hashes = ecoff_data (input_bfd)->sym_hashes; |
| 886 | |
| 887 | gp = ecoff_data (output_bfd)->gp; |
| 888 | if (gp == 0) |
| 889 | gp_undefined = true; |
| 890 | else |
| 891 | gp_undefined = false; |
| 892 | |
| 893 | got_reflo = false; |
| 894 | |
| 895 | adjust = 0; |
| 896 | |
| 897 | if (ecoff_section_data (input_bfd, input_section) == NULL) |
| 898 | offsets = NULL; |
| 899 | else |
| 900 | offsets = ecoff_section_data (input_bfd, input_section)->offsets; |
| 901 | |
| 902 | ext_rel = (struct external_reloc *) external_relocs; |
| 903 | ext_rel_end = ext_rel + input_section->reloc_count; |
| 904 | for (i = 0; ext_rel < ext_rel_end; ext_rel++, i++) |
| 905 | { |
| 906 | struct internal_reloc int_rel; |
| 907 | bfd_vma addend; |
| 908 | reloc_howto_type *howto; |
| 909 | struct ecoff_link_hash_entry *h = NULL; |
| 910 | asection *s = NULL; |
| 911 | bfd_vma relocation; |
| 912 | bfd_reloc_status_type r; |
| 913 | |
| 914 | if (! got_reflo) |
| 915 | mips_ecoff_swap_reloc_in (input_bfd, (PTR) ext_rel, &int_rel); |
| 916 | else |
| 917 | { |
| 918 | int_rel = reflo_int_rel; |
| 919 | got_reflo = false; |
| 920 | } |
| 921 | |
| 922 | BFD_ASSERT (int_rel.r_type |
| 923 | < sizeof mips_howto_table / sizeof mips_howto_table[0]); |
| 924 | |
| 925 | /* The REFHI reloc requires special handling. It must be |
| 926 | followed by a REFLO reloc, and the addend is formed from both |
| 927 | fields. */ |
| 928 | if (int_rel.r_type == MIPS_R_REFHI) |
| 929 | { |
| 930 | BFD_ASSERT ((ext_rel + 1) < ext_rel_end); |
| 931 | mips_ecoff_swap_reloc_in (input_bfd, (PTR) (ext_rel + 1), |
| 932 | &reflo_int_rel); |
| 933 | BFD_ASSERT (reflo_int_rel.r_type == MIPS_R_REFLO |
| 934 | && int_rel.r_extern == reflo_int_rel.r_extern |
| 935 | && int_rel.r_symndx == reflo_int_rel.r_symndx); |
| 936 | got_reflo = true; |
| 937 | } |
| 938 | |
| 939 | howto = &mips_howto_table[int_rel.r_type]; |
| 940 | |
| 941 | if (int_rel.r_extern) |
| 942 | { |
| 943 | h = sym_hashes[int_rel.r_symndx]; |
| 944 | /* If h is NULL, that means that there is a reloc against an |
| 945 | external symbol which we thought was just a debugging |
| 946 | symbol. This should not happen. */ |
| 947 | if (h == (struct ecoff_link_hash_entry *) NULL) |
| 948 | abort (); |
| 949 | } |
| 950 | else |
| 951 | { |
| 952 | if (int_rel.r_symndx < 0 || int_rel.r_symndx >= NUM_RELOC_SECTIONS) |
| 953 | s = NULL; |
| 954 | else |
| 955 | s = symndx_to_section[int_rel.r_symndx]; |
| 956 | |
| 957 | if (s == (asection *) NULL) |
| 958 | abort (); |
| 959 | } |
| 960 | |
| 961 | /* The GPREL reloc uses an addend: the difference in the GP |
| 962 | values. */ |
| 963 | if (int_rel.r_type != MIPS_R_GPREL |
| 964 | && int_rel.r_type != MIPS_R_LITERAL) |
| 965 | addend = 0; |
| 966 | else |
| 967 | { |
| 968 | if (gp_undefined) |
| 969 | { |
| 970 | if (! ((*info->callbacks->reloc_dangerous) |
| 971 | (info, "GP relative relocation when GP not defined", |
| 972 | input_bfd, input_section, |
| 973 | int_rel.r_vaddr - input_section->vma))) |
| 974 | return false; |
| 975 | /* Only give the error once per link. */ |
| 976 | ecoff_data (output_bfd)->gp = gp = 4; |
| 977 | gp_undefined = false; |
| 978 | } |
| 979 | if (! int_rel.r_extern) |
| 980 | { |
| 981 | /* This is a relocation against a section. The current |
| 982 | addend in the instruction is the difference between |
| 983 | INPUT_SECTION->vma and the GP value of INPUT_BFD. We |
| 984 | must change this to be the difference between the |
| 985 | final definition (which will end up in RELOCATION) |
| 986 | and the GP value of OUTPUT_BFD (which is in GP). */ |
| 987 | addend = ecoff_data (input_bfd)->gp - gp; |
| 988 | } |
| 989 | else if (! info->relocateable |
| 990 | || h->root.type == bfd_link_hash_defined) |
| 991 | { |
| 992 | /* This is a relocation against an undefined or common |
| 993 | symbol. The current addend in the instruction is |
| 994 | simply the desired offset into the symbol (normally |
| 995 | zero). We are going to change this into a relocation |
| 996 | against a defined symbol, so we want the instruction |
| 997 | to hold the difference between the final definition |
| 998 | of the symbol (which will end up in RELOCATION) and |
| 999 | the GP value of OUTPUT_BFD (which is in GP). */ |
| 1000 | addend = - gp; |
| 1001 | } |
| 1002 | else |
| 1003 | { |
| 1004 | /* This is a relocation against an undefined or common |
| 1005 | symbol. The current addend in the instruction is |
| 1006 | simply the desired offset into the symbol (normally |
| 1007 | zero). We are generating relocateable output, and we |
| 1008 | aren't going to define this symbol, so we just leave |
| 1009 | the instruction alone. */ |
| 1010 | addend = 0; |
| 1011 | } |
| 1012 | } |
| 1013 | |
| 1014 | /* If we are relaxing, mips_relax_section may have set |
| 1015 | offsets[i] to some value. A value of 1 means we must expand |
| 1016 | a PC relative branch into a multi-instruction of sequence, |
| 1017 | and any other value is an addend. */ |
| 1018 | if (offsets != NULL |
| 1019 | && offsets[i] != 0) |
| 1020 | { |
| 1021 | BFD_ASSERT (! info->relocateable); |
| 1022 | BFD_ASSERT (int_rel.r_type == MIPS_R_PCREL16); |
| 1023 | if (offsets[i] != 1) |
| 1024 | { |
| 1025 | BFD_ASSERT (! int_rel.r_extern); |
| 1026 | addend += offsets[i]; |
| 1027 | } |
| 1028 | else |
| 1029 | { |
| 1030 | bfd_byte *here; |
| 1031 | |
| 1032 | BFD_ASSERT (int_rel.r_extern); |
| 1033 | |
| 1034 | /* Move the rest of the instructions up. */ |
| 1035 | here = (contents |
| 1036 | + adjust |
| 1037 | + int_rel.r_vaddr |
| 1038 | - input_section->vma); |
| 1039 | memmove (here + PCREL16_EXPANSION_ADJUSTMENT, here, |
| 1040 | (input_section->_raw_size |
| 1041 | - (int_rel.r_vaddr - input_section->vma))); |
| 1042 | |
| 1043 | /* Generate the new instructions. */ |
| 1044 | if (! mips_relax_pcrel16 (info, input_bfd, input_section, |
| 1045 | h, here, |
| 1046 | (input_section->output_section->vma |
| 1047 | + input_section->output_offset |
| 1048 | + (int_rel.r_vaddr |
| 1049 | - input_section->vma) |
| 1050 | + adjust))) |
| 1051 | return false; |
| 1052 | |
| 1053 | /* We must adjust everything else up a notch. */ |
| 1054 | adjust += PCREL16_EXPANSION_ADJUSTMENT; |
| 1055 | |
| 1056 | /* mips_relax_pcrel16 handles all the details of this |
| 1057 | relocation. */ |
| 1058 | continue; |
| 1059 | } |
| 1060 | } |
| 1061 | |
| 1062 | if (info->relocateable) |
| 1063 | { |
| 1064 | /* We are generating relocateable output, and must convert |
| 1065 | the existing reloc. */ |
| 1066 | if (int_rel.r_extern) |
| 1067 | { |
| 1068 | if (h->root.type == bfd_link_hash_defined) |
| 1069 | { |
| 1070 | const char *name; |
| 1071 | |
| 1072 | /* This symbol is defined in the output. Convert |
| 1073 | the reloc from being against the symbol to being |
| 1074 | against the section. */ |
| 1075 | |
| 1076 | /* Clear the r_extern bit. */ |
| 1077 | int_rel.r_extern = 0; |
| 1078 | |
| 1079 | /* Compute a new r_symndx value. */ |
| 1080 | s = h->root.u.def.section; |
| 1081 | name = bfd_get_section_name (output_bfd, |
| 1082 | s->output_section); |
| 1083 | |
| 1084 | int_rel.r_symndx = -1; |
| 1085 | switch (name[1]) |
| 1086 | { |
| 1087 | case 'b': |
| 1088 | if (strcmp (name, ".bss") == 0) |
| 1089 | int_rel.r_symndx = RELOC_SECTION_BSS; |
| 1090 | break; |
| 1091 | case 'd': |
| 1092 | if (strcmp (name, ".data") == 0) |
| 1093 | int_rel.r_symndx = RELOC_SECTION_DATA; |
| 1094 | break; |
| 1095 | case 'f': |
| 1096 | if (strcmp (name, ".fini") == 0) |
| 1097 | int_rel.r_symndx = RELOC_SECTION_FINI; |
| 1098 | break; |
| 1099 | case 'i': |
| 1100 | if (strcmp (name, ".init") == 0) |
| 1101 | int_rel.r_symndx = RELOC_SECTION_INIT; |
| 1102 | break; |
| 1103 | case 'l': |
| 1104 | if (strcmp (name, ".lit8") == 0) |
| 1105 | int_rel.r_symndx = RELOC_SECTION_LIT8; |
| 1106 | else if (strcmp (name, ".lit4") == 0) |
| 1107 | int_rel.r_symndx = RELOC_SECTION_LIT4; |
| 1108 | break; |
| 1109 | case 'r': |
| 1110 | if (strcmp (name, ".rdata") == 0) |
| 1111 | int_rel.r_symndx = RELOC_SECTION_RDATA; |
| 1112 | break; |
| 1113 | case 's': |
| 1114 | if (strcmp (name, ".sdata") == 0) |
| 1115 | int_rel.r_symndx = RELOC_SECTION_SDATA; |
| 1116 | else if (strcmp (name, ".sbss") == 0) |
| 1117 | int_rel.r_symndx = RELOC_SECTION_SBSS; |
| 1118 | break; |
| 1119 | case 't': |
| 1120 | if (strcmp (name, ".text") == 0) |
| 1121 | int_rel.r_symndx = RELOC_SECTION_TEXT; |
| 1122 | break; |
| 1123 | } |
| 1124 | |
| 1125 | if (int_rel.r_symndx == -1) |
| 1126 | abort (); |
| 1127 | |
| 1128 | /* Add the section VMA and the symbol value. */ |
| 1129 | relocation = (h->root.u.def.value |
| 1130 | + s->output_section->vma |
| 1131 | + s->output_offset); |
| 1132 | |
| 1133 | /* For a PC relative relocation, the object file |
| 1134 | currently holds just the addend. We must adjust |
| 1135 | by the address to get the right value. */ |
| 1136 | if (howto->pc_relative) |
| 1137 | relocation -= int_rel.r_vaddr - input_section->vma; |
| 1138 | |
| 1139 | h = NULL; |
| 1140 | } |
| 1141 | else |
| 1142 | { |
| 1143 | /* Change the symndx value to the right one for the |
| 1144 | output BFD. */ |
| 1145 | int_rel.r_symndx = h->indx; |
| 1146 | if (int_rel.r_symndx == -1) |
| 1147 | { |
| 1148 | /* This symbol is not being written out. */ |
| 1149 | if (! ((*info->callbacks->unattached_reloc) |
| 1150 | (info, h->root.root.string, input_bfd, |
| 1151 | input_section, |
| 1152 | int_rel.r_vaddr - input_section->vma))) |
| 1153 | return false; |
| 1154 | int_rel.r_symndx = 0; |
| 1155 | } |
| 1156 | relocation = 0; |
| 1157 | } |
| 1158 | } |
| 1159 | else |
| 1160 | { |
| 1161 | /* This is a relocation against a section. Adjust the |
| 1162 | value by the amount the section moved. */ |
| 1163 | relocation = (s->output_section->vma |
| 1164 | + s->output_offset |
| 1165 | - s->vma); |
| 1166 | } |
| 1167 | |
| 1168 | relocation += addend; |
| 1169 | |
| 1170 | /* Adjust a PC relative relocation by removing the reference |
| 1171 | to the original address in the section and including the |
| 1172 | reference to the new address. */ |
| 1173 | if (howto->pc_relative) |
| 1174 | relocation -= (input_section->output_section->vma |
| 1175 | + input_section->output_offset |
| 1176 | - input_section->vma); |
| 1177 | |
| 1178 | /* Adjust the contents. */ |
| 1179 | if (relocation == 0) |
| 1180 | r = bfd_reloc_ok; |
| 1181 | else |
| 1182 | { |
| 1183 | if (int_rel.r_type != MIPS_R_REFHI) |
| 1184 | r = _bfd_relocate_contents (howto, input_bfd, relocation, |
| 1185 | (contents |
| 1186 | + adjust |
| 1187 | + int_rel.r_vaddr |
| 1188 | - input_section->vma)); |
| 1189 | else |
| 1190 | { |
| 1191 | mips_relocate_refhi (&int_rel, &reflo_int_rel, |
| 1192 | input_bfd, input_section, contents, |
| 1193 | adjust, relocation); |
| 1194 | r = bfd_reloc_ok; |
| 1195 | } |
| 1196 | } |
| 1197 | |
| 1198 | /* Adjust the reloc address. */ |
| 1199 | int_rel.r_vaddr += (input_section->output_section->vma |
| 1200 | + input_section->output_offset |
| 1201 | - input_section->vma); |
| 1202 | |
| 1203 | /* Save the changed reloc information. */ |
| 1204 | mips_ecoff_swap_reloc_out (input_bfd, &int_rel, (PTR) ext_rel); |
| 1205 | } |
| 1206 | else |
| 1207 | { |
| 1208 | /* We are producing a final executable. */ |
| 1209 | if (int_rel.r_extern) |
| 1210 | { |
| 1211 | /* This is a reloc against a symbol. */ |
| 1212 | if (h->root.type == bfd_link_hash_defined) |
| 1213 | { |
| 1214 | asection *hsec; |
| 1215 | |
| 1216 | hsec = h->root.u.def.section; |
| 1217 | relocation = (h->root.u.def.value |
| 1218 | + hsec->output_section->vma |
| 1219 | + hsec->output_offset); |
| 1220 | } |
| 1221 | else |
| 1222 | { |
| 1223 | if (! ((*info->callbacks->undefined_symbol) |
| 1224 | (info, h->root.root.string, input_bfd, |
| 1225 | input_section, |
| 1226 | int_rel.r_vaddr - input_section->vma))) |
| 1227 | return false; |
| 1228 | relocation = 0; |
| 1229 | } |
| 1230 | } |
| 1231 | else |
| 1232 | { |
| 1233 | /* This is a reloc against a section. */ |
| 1234 | relocation = (s->output_section->vma |
| 1235 | + s->output_offset |
| 1236 | - s->vma); |
| 1237 | |
| 1238 | /* A PC relative reloc is already correct in the object |
| 1239 | file. Make it look like a pcrel_offset relocation by |
| 1240 | adding in the start address. */ |
| 1241 | if (howto->pc_relative) |
| 1242 | relocation += int_rel.r_vaddr + adjust; |
| 1243 | } |
| 1244 | |
| 1245 | if (int_rel.r_type != MIPS_R_REFHI) |
| 1246 | r = _bfd_final_link_relocate (howto, |
| 1247 | input_bfd, |
| 1248 | input_section, |
| 1249 | contents, |
| 1250 | (int_rel.r_vaddr |
| 1251 | - input_section->vma |
| 1252 | + adjust), |
| 1253 | relocation, |
| 1254 | addend); |
| 1255 | else |
| 1256 | { |
| 1257 | mips_relocate_refhi (&int_rel, &reflo_int_rel, input_bfd, |
| 1258 | input_section, contents, adjust, |
| 1259 | relocation); |
| 1260 | r = bfd_reloc_ok; |
| 1261 | } |
| 1262 | } |
| 1263 | |
| 1264 | if (r != bfd_reloc_ok) |
| 1265 | { |
| 1266 | switch (r) |
| 1267 | { |
| 1268 | default: |
| 1269 | case bfd_reloc_outofrange: |
| 1270 | abort (); |
| 1271 | case bfd_reloc_overflow: |
| 1272 | { |
| 1273 | const char *name; |
| 1274 | |
| 1275 | if (int_rel.r_extern) |
| 1276 | name = h->root.root.string; |
| 1277 | else |
| 1278 | name = bfd_section_name (input_bfd, s); |
| 1279 | if (! ((*info->callbacks->reloc_overflow) |
| 1280 | (info, name, howto->name, (bfd_vma) 0, |
| 1281 | input_bfd, input_section, |
| 1282 | int_rel.r_vaddr - input_section->vma))) |
| 1283 | return false; |
| 1284 | } |
| 1285 | break; |
| 1286 | } |
| 1287 | } |
| 1288 | } |
| 1289 | |
| 1290 | return true; |
| 1291 | } |
| 1292 | \f |
| 1293 | /* Relax a section when linking a MIPS ECOFF file. This is used for |
| 1294 | embedded PIC code, which always uses PC relative branches which |
| 1295 | only have an 18 bit range on MIPS. If a branch is not in range, we |
| 1296 | generate a long instruction sequence to compensate. Each time we |
| 1297 | find a branch to expand, we have to check all the others again to |
| 1298 | make sure they are still in range. This is slow, but it only has |
| 1299 | to be done when -relax is passed to the linker. |
| 1300 | |
| 1301 | This routine figures out which branches need to expand; the actual |
| 1302 | expansion is done in mips_relocate_section when the section |
| 1303 | contents are relocated. The information is stored in the offsets |
| 1304 | field of the ecoff_section_tdata structure. An offset of 1 means |
| 1305 | that the branch must be expanded into a multi-instruction PC |
| 1306 | relative branch (such an offset will only occur for a PC relative |
| 1307 | branch to an external symbol). Any other offset must be a multiple |
| 1308 | of four, and is the amount to change the branch by (such an offset |
| 1309 | will only occur for a PC relative branch within the same section). |
| 1310 | |
| 1311 | We do not modify the section relocs or contents themselves so that |
| 1312 | if memory usage becomes an issue we can discard them and read them |
| 1313 | again. The only information we must save in memory between this |
| 1314 | routine and the mips_relocate_section routine is the table of |
| 1315 | offsets. */ |
| 1316 | |
| 1317 | static boolean |
| 1318 | mips_relax_section (abfd, sec, info, again) |
| 1319 | bfd *abfd; |
| 1320 | asection *sec; |
| 1321 | struct bfd_link_info *info; |
| 1322 | boolean *again; |
| 1323 | { |
| 1324 | struct ecoff_section_tdata *section_tdata; |
| 1325 | bfd_byte *contents = NULL; |
| 1326 | long *offsets; |
| 1327 | struct external_reloc *ext_rel; |
| 1328 | struct external_reloc *ext_rel_end; |
| 1329 | unsigned int i; |
| 1330 | |
| 1331 | /* Assume we are not going to need another pass. */ |
| 1332 | *again = false; |
| 1333 | |
| 1334 | /* If we are not generating an ECOFF file, this is much too |
| 1335 | confusing to deal with. */ |
| 1336 | if (info->hash->creator->flavour != bfd_get_flavour (abfd)) |
| 1337 | return true; |
| 1338 | |
| 1339 | /* If there are no relocs, there is nothing to do. */ |
| 1340 | if (sec->reloc_count == 0) |
| 1341 | return true; |
| 1342 | |
| 1343 | /* We are only interested in PC relative relocs, and why would there |
| 1344 | ever be one from anything but the .text section? */ |
| 1345 | if (strcmp (bfd_get_section_name (abfd, sec), ".text") != 0) |
| 1346 | return true; |
| 1347 | |
| 1348 | /* Read in the relocs, if we haven't already got them. */ |
| 1349 | section_tdata = ecoff_section_data (abfd, sec); |
| 1350 | if (section_tdata == (struct ecoff_section_tdata *) NULL) |
| 1351 | { |
| 1352 | bfd_size_type external_reloc_size; |
| 1353 | bfd_size_type external_relocs_size; |
| 1354 | |
| 1355 | sec->used_by_bfd = |
| 1356 | (PTR) bfd_alloc_by_size_t (abfd, sizeof (struct ecoff_section_tdata)); |
| 1357 | if (sec->used_by_bfd == NULL) |
| 1358 | { |
| 1359 | bfd_set_error (bfd_error_no_memory); |
| 1360 | goto error_return; |
| 1361 | } |
| 1362 | |
| 1363 | section_tdata = ecoff_section_data (abfd, sec); |
| 1364 | section_tdata->contents = NULL; |
| 1365 | section_tdata->offsets = NULL; |
| 1366 | |
| 1367 | external_reloc_size = ecoff_backend (abfd)->external_reloc_size; |
| 1368 | external_relocs_size = external_reloc_size * sec->reloc_count; |
| 1369 | |
| 1370 | section_tdata->external_relocs = |
| 1371 | (PTR) bfd_alloc (abfd, external_relocs_size); |
| 1372 | if (section_tdata->external_relocs == NULL && external_relocs_size != 0) |
| 1373 | { |
| 1374 | bfd_set_error (bfd_error_no_memory); |
| 1375 | goto error_return; |
| 1376 | } |
| 1377 | |
| 1378 | if (bfd_seek (abfd, sec->rel_filepos, SEEK_SET) != 0 |
| 1379 | || (bfd_read (section_tdata->external_relocs, 1, |
| 1380 | external_relocs_size, abfd) |
| 1381 | != external_relocs_size)) |
| 1382 | goto error_return; |
| 1383 | |
| 1384 | /* We must initialize _cooked_size only the first time we are |
| 1385 | called. */ |
| 1386 | sec->_cooked_size = sec->_raw_size; |
| 1387 | } |
| 1388 | |
| 1389 | contents = section_tdata->contents; |
| 1390 | offsets = section_tdata->offsets; |
| 1391 | |
| 1392 | /* Look for any external PC relative relocs. Internal PC relative |
| 1393 | relocs are already correct in the object file, so they certainly |
| 1394 | can not overflow. */ |
| 1395 | ext_rel = (struct external_reloc *) section_tdata->external_relocs; |
| 1396 | ext_rel_end = ext_rel + sec->reloc_count; |
| 1397 | for (i = 0; ext_rel < ext_rel_end; ext_rel++, i++) |
| 1398 | { |
| 1399 | struct internal_reloc int_rel; |
| 1400 | struct ecoff_link_hash_entry *h; |
| 1401 | asection *hsec; |
| 1402 | bfd_signed_vma relocation; |
| 1403 | struct external_reloc *adj_ext_rel; |
| 1404 | unsigned int adj_i; |
| 1405 | unsigned long ext_count; |
| 1406 | struct ecoff_link_hash_entry **adj_h_ptr; |
| 1407 | struct ecoff_link_hash_entry **adj_h_ptr_end; |
| 1408 | struct ecoff_value_adjust *adjust; |
| 1409 | |
| 1410 | /* If we have already expanded this reloc, we certainly don't |
| 1411 | need to do it again. */ |
| 1412 | if (offsets != (long *) NULL && offsets[i] == 1) |
| 1413 | continue; |
| 1414 | |
| 1415 | /* Quickly check that this reloc is external PCREL16. */ |
| 1416 | if (abfd->xvec->header_byteorder_big_p) |
| 1417 | { |
| 1418 | if ((ext_rel->r_bits[3] & RELOC_BITS3_EXTERN_BIG) == 0 |
| 1419 | || (((ext_rel->r_bits[3] & RELOC_BITS3_TYPE_BIG) |
| 1420 | >> RELOC_BITS3_TYPE_SH_BIG) |
| 1421 | != MIPS_R_PCREL16)) |
| 1422 | continue; |
| 1423 | } |
| 1424 | else |
| 1425 | { |
| 1426 | if ((ext_rel->r_bits[3] & RELOC_BITS3_EXTERN_LITTLE) == 0 |
| 1427 | || (((ext_rel->r_bits[3] & RELOC_BITS3_TYPE_LITTLE) |
| 1428 | >> RELOC_BITS3_TYPE_SH_LITTLE) |
| 1429 | != MIPS_R_PCREL16)) |
| 1430 | continue; |
| 1431 | } |
| 1432 | |
| 1433 | mips_ecoff_swap_reloc_in (abfd, (PTR) ext_rel, &int_rel); |
| 1434 | |
| 1435 | h = ecoff_data (abfd)->sym_hashes[int_rel.r_symndx]; |
| 1436 | if (h == (struct ecoff_link_hash_entry *) NULL) |
| 1437 | abort (); |
| 1438 | |
| 1439 | if (h->root.type != bfd_link_hash_defined) |
| 1440 | { |
| 1441 | /* Just ignore undefined symbols. These will presumably |
| 1442 | generate an error later in the link. */ |
| 1443 | continue; |
| 1444 | } |
| 1445 | |
| 1446 | /* Get the value of the symbol. */ |
| 1447 | hsec = h->root.u.def.section; |
| 1448 | relocation = (h->root.u.def.value |
| 1449 | + hsec->output_section->vma |
| 1450 | + hsec->output_offset); |
| 1451 | |
| 1452 | /* Subtract out the current address. */ |
| 1453 | relocation -= (sec->output_section->vma |
| 1454 | + sec->output_offset |
| 1455 | + (int_rel.r_vaddr - sec->vma)); |
| 1456 | |
| 1457 | /* The addend is stored in the object file. In the normal case |
| 1458 | of ``bal symbol'', the addend will be -4. It will only be |
| 1459 | different in the case of ``bal symbol+constant''. To avoid |
| 1460 | always reading in the section contents, we don't check the |
| 1461 | addend in the object file (we could easily check the contents |
| 1462 | if we happen to have already read them in, but I fear that |
| 1463 | this could be confusing). This means we will screw up if |
| 1464 | there is a branch to a symbol that is in range, but added to |
| 1465 | a constant which puts it out of range; in such a case the |
| 1466 | link will fail with a reloc overflow error. Since the |
| 1467 | compiler will never generate such code, it should be easy |
| 1468 | enough to work around it by changing the assembly code in the |
| 1469 | source file. */ |
| 1470 | relocation -= 4; |
| 1471 | |
| 1472 | /* Now RELOCATION is the number we want to put in the object |
| 1473 | file. See whether it fits. */ |
| 1474 | if (relocation >= -0x20000 && relocation < 0x20000) |
| 1475 | continue; |
| 1476 | |
| 1477 | /* Now that we know this reloc needs work, which will rarely |
| 1478 | happen, go ahead and grab the section contents. */ |
| 1479 | if (contents == (bfd_byte *) NULL) |
| 1480 | { |
| 1481 | if (info->keep_memory) |
| 1482 | contents = (bfd_byte *) bfd_alloc (abfd, sec->_raw_size); |
| 1483 | else |
| 1484 | contents = (bfd_byte *) malloc (sec->_raw_size); |
| 1485 | if (contents == (bfd_byte *) NULL) |
| 1486 | { |
| 1487 | bfd_set_error (bfd_error_no_memory); |
| 1488 | goto error_return; |
| 1489 | } |
| 1490 | if (! bfd_get_section_contents (abfd, sec, (PTR) contents, |
| 1491 | (file_ptr) 0, sec->_raw_size)) |
| 1492 | goto error_return; |
| 1493 | if (info->keep_memory) |
| 1494 | section_tdata->contents = contents; |
| 1495 | } |
| 1496 | |
| 1497 | /* We only support changing the bal instruction. It would be |
| 1498 | possible to handle other PC relative branches, but some of |
| 1499 | them (the conditional branches) would require a different |
| 1500 | length instruction sequence which would complicate both this |
| 1501 | routine and mips_relax_pcrel16. It could be written if |
| 1502 | somebody felt it were important. Ignoring this reloc will |
| 1503 | presumably cause a reloc overflow error later on. */ |
| 1504 | if (bfd_get_32 (abfd, contents + int_rel.r_vaddr - sec->vma) |
| 1505 | != 0x0411ffff) /* bgezal $0,. == bal . */ |
| 1506 | continue; |
| 1507 | |
| 1508 | /* Bother. We need to expand this reloc, and we will need to |
| 1509 | make another relaxation pass since this change may put other |
| 1510 | relocs out of range. We need to examine the local branches |
| 1511 | and we need to allocate memory to hold the offsets we must |
| 1512 | add to them. We also need to adjust the values of all |
| 1513 | symbols in the object file following this location. */ |
| 1514 | |
| 1515 | sec->_cooked_size += PCREL16_EXPANSION_ADJUSTMENT; |
| 1516 | *again = true; |
| 1517 | |
| 1518 | if (offsets == (long *) NULL) |
| 1519 | { |
| 1520 | size_t size; |
| 1521 | |
| 1522 | size = sec->reloc_count * sizeof (long); |
| 1523 | offsets = (long *) bfd_alloc_by_size_t (abfd, size); |
| 1524 | if (offsets == (long *) NULL) |
| 1525 | { |
| 1526 | bfd_set_error (bfd_error_no_memory); |
| 1527 | goto error_return; |
| 1528 | } |
| 1529 | memset (offsets, 0, size); |
| 1530 | section_tdata->offsets = offsets; |
| 1531 | } |
| 1532 | |
| 1533 | offsets[i] = 1; |
| 1534 | |
| 1535 | /* Now look for all PC relative branches that cross this reloc |
| 1536 | and adjust their offsets. We will turn the single branch |
| 1537 | instruction into a four instruction sequence. In this loop |
| 1538 | we are only interested in local PC relative branches. */ |
| 1539 | adj_ext_rel = (struct external_reloc *) section_tdata->external_relocs; |
| 1540 | for (adj_i = 0; adj_ext_rel < ext_rel_end; adj_ext_rel++, adj_i++) |
| 1541 | { |
| 1542 | struct internal_reloc adj_int_rel; |
| 1543 | unsigned long insn; |
| 1544 | bfd_vma dst; |
| 1545 | |
| 1546 | /* Quickly check that this reloc is internal PCREL16. */ |
| 1547 | if (abfd->xvec->header_byteorder_big_p) |
| 1548 | { |
| 1549 | if ((adj_ext_rel->r_bits[3] & RELOC_BITS3_EXTERN_BIG) != 0 |
| 1550 | || (((adj_ext_rel->r_bits[3] & RELOC_BITS3_TYPE_BIG) |
| 1551 | >> RELOC_BITS3_TYPE_SH_BIG) |
| 1552 | != MIPS_R_PCREL16)) |
| 1553 | continue; |
| 1554 | } |
| 1555 | else |
| 1556 | { |
| 1557 | if ((adj_ext_rel->r_bits[3] & RELOC_BITS3_EXTERN_LITTLE) != 0 |
| 1558 | || (((adj_ext_rel->r_bits[3] & RELOC_BITS3_TYPE_LITTLE) |
| 1559 | >> RELOC_BITS3_TYPE_SH_LITTLE) |
| 1560 | != MIPS_R_PCREL16)) |
| 1561 | continue; |
| 1562 | } |
| 1563 | |
| 1564 | mips_ecoff_swap_reloc_in (abfd, (PTR) adj_ext_rel, &adj_int_rel); |
| 1565 | |
| 1566 | /* We are only interested in a PC relative reloc within this |
| 1567 | section. FIXME: Cross section PC relative relocs may not |
| 1568 | be handled correctly; does anybody care? */ |
| 1569 | if (adj_int_rel.r_symndx != RELOC_SECTION_TEXT) |
| 1570 | continue; |
| 1571 | |
| 1572 | /* Fetch the branch instruction. */ |
| 1573 | insn = bfd_get_32 (abfd, contents + adj_int_rel.r_vaddr - sec->vma); |
| 1574 | |
| 1575 | /* Work out the destination address. */ |
| 1576 | dst = (insn & 0xffff) << 2; |
| 1577 | if ((dst & 0x20000) != 0) |
| 1578 | dst -= 0x40000; |
| 1579 | dst += adj_int_rel.r_vaddr + 4; |
| 1580 | |
| 1581 | /* If this branch crosses the branch we just decided to |
| 1582 | expand, adjust the offset appropriately. */ |
| 1583 | if (adj_int_rel.r_vaddr < int_rel.r_vaddr |
| 1584 | && dst > int_rel.r_vaddr) |
| 1585 | offsets[adj_i] += PCREL16_EXPANSION_ADJUSTMENT; |
| 1586 | else if (adj_int_rel.r_vaddr > int_rel.r_vaddr |
| 1587 | && dst <= int_rel.r_vaddr) |
| 1588 | offsets[adj_i] -= PCREL16_EXPANSION_ADJUSTMENT; |
| 1589 | } |
| 1590 | |
| 1591 | /* Find all symbols in this section defined by this object file |
| 1592 | and adjust their values. Note that we decide whether to |
| 1593 | adjust the value based on the value stored in the ECOFF EXTR |
| 1594 | structure, because the value stored in the hash table may |
| 1595 | have been changed by an earlier expanded reloc and thus may |
| 1596 | no longer correctly indicate whether the symbol is before or |
| 1597 | after the expanded reloc. */ |
| 1598 | ext_count = ecoff_data (abfd)->debug_info.symbolic_header.iextMax; |
| 1599 | adj_h_ptr = ecoff_data (abfd)->sym_hashes; |
| 1600 | adj_h_ptr_end = adj_h_ptr + ext_count; |
| 1601 | for (; adj_h_ptr < adj_h_ptr_end; adj_h_ptr++) |
| 1602 | { |
| 1603 | struct ecoff_link_hash_entry *adj_h; |
| 1604 | |
| 1605 | adj_h = *adj_h_ptr; |
| 1606 | if (adj_h != (struct ecoff_link_hash_entry *) NULL |
| 1607 | && adj_h->root.type == bfd_link_hash_defined |
| 1608 | && adj_h->root.u.def.section == sec |
| 1609 | && adj_h->esym.asym.value > int_rel.r_vaddr) |
| 1610 | adj_h->root.u.def.value += PCREL16_EXPANSION_ADJUSTMENT; |
| 1611 | } |
| 1612 | |
| 1613 | /* Add an entry to the symbol value adjust list. This is used |
| 1614 | by bfd_ecoff_debug_accumulate to adjust the values of |
| 1615 | internal symbols and FDR's. */ |
| 1616 | adjust = ((struct ecoff_value_adjust *) |
| 1617 | bfd_alloc (abfd, sizeof (struct ecoff_value_adjust))); |
| 1618 | if (adjust == (struct ecoff_value_adjust *) NULL) |
| 1619 | { |
| 1620 | bfd_set_error (bfd_error_no_memory); |
| 1621 | goto error_return; |
| 1622 | } |
| 1623 | |
| 1624 | adjust->start = int_rel.r_vaddr; |
| 1625 | adjust->end = sec->vma + sec->_raw_size; |
| 1626 | adjust->adjust = PCREL16_EXPANSION_ADJUSTMENT; |
| 1627 | |
| 1628 | adjust->next = ecoff_data (abfd)->debug_info.adjust; |
| 1629 | ecoff_data (abfd)->debug_info.adjust = adjust; |
| 1630 | } |
| 1631 | |
| 1632 | if (contents != (bfd_byte *) NULL && ! info->keep_memory) |
| 1633 | free (contents); |
| 1634 | |
| 1635 | return true; |
| 1636 | |
| 1637 | error_return: |
| 1638 | if (contents != (bfd_byte *) NULL && ! info->keep_memory) |
| 1639 | free (contents); |
| 1640 | return false; |
| 1641 | } |
| 1642 | |
| 1643 | /* This routine is called from mips_relocate_section when a PC |
| 1644 | relative reloc must be expanded into the five instruction sequence. |
| 1645 | It handles all the details of the expansion, including resolving |
| 1646 | the reloc. */ |
| 1647 | |
| 1648 | static boolean |
| 1649 | mips_relax_pcrel16 (info, input_bfd, input_section, h, location, address) |
| 1650 | struct bfd_link_info *info; |
| 1651 | bfd *input_bfd; |
| 1652 | asection *input_section; |
| 1653 | struct ecoff_link_hash_entry *h; |
| 1654 | bfd_byte *location; |
| 1655 | bfd_vma address; |
| 1656 | { |
| 1657 | bfd_vma relocation; |
| 1658 | |
| 1659 | /* 0x0411ffff is bgezal $0,. == bal . */ |
| 1660 | BFD_ASSERT (bfd_get_32 (input_bfd, location) == 0x0411ffff); |
| 1661 | |
| 1662 | /* We need to compute the distance between the symbol and the |
| 1663 | current address plus eight. */ |
| 1664 | relocation = (h->root.u.def.value |
| 1665 | + h->root.u.def.section->output_section->vma |
| 1666 | + h->root.u.def.section->output_offset); |
| 1667 | relocation -= address + 8; |
| 1668 | |
| 1669 | /* If the lower half is negative, increment the upper 16 half. */ |
| 1670 | if ((relocation & 0x8000) != 0) |
| 1671 | relocation += 0x10000; |
| 1672 | |
| 1673 | bfd_put_32 (input_bfd, 0x04110001, location); /* bal .+8 */ |
| 1674 | bfd_put_32 (input_bfd, |
| 1675 | 0x3c010000 | ((relocation >> 16) & 0xffff), /* lui $at,XX */ |
| 1676 | location + 4); |
| 1677 | bfd_put_32 (input_bfd, |
| 1678 | 0x24210000 | (relocation & 0xffff), /* addiu $at,$at,XX */ |
| 1679 | location + 8); |
| 1680 | bfd_put_32 (input_bfd, 0x003f0821, location + 12); /* addu $at,$at,$ra */ |
| 1681 | bfd_put_32 (input_bfd, 0x0020f809, location + 16); /* jalr $at */ |
| 1682 | |
| 1683 | return true; |
| 1684 | } |
| 1685 | \f |
| 1686 | /* This is the ECOFF backend structure. The backend field of the |
| 1687 | target vector points to this. */ |
| 1688 | |
| 1689 | static const struct ecoff_backend_data mips_ecoff_backend_data = |
| 1690 | { |
| 1691 | /* COFF backend structure. */ |
| 1692 | { |
| 1693 | (void (*) PARAMS ((bfd *,PTR,int,int,int,int,PTR))) bfd_void, /* aux_in */ |
| 1694 | (void (*) PARAMS ((bfd *,PTR,PTR))) bfd_void, /* sym_in */ |
| 1695 | (void (*) PARAMS ((bfd *,PTR,PTR))) bfd_void, /* lineno_in */ |
| 1696 | (unsigned (*) PARAMS ((bfd *,PTR,int,int,int,int,PTR)))bfd_void,/*aux_out*/ |
| 1697 | (unsigned (*) PARAMS ((bfd *,PTR,PTR))) bfd_void, /* sym_out */ |
| 1698 | (unsigned (*) PARAMS ((bfd *,PTR,PTR))) bfd_void, /* lineno_out */ |
| 1699 | (unsigned (*) PARAMS ((bfd *,PTR,PTR))) bfd_void, /* reloc_out */ |
| 1700 | mips_ecoff_swap_filehdr_out, mips_ecoff_swap_aouthdr_out, |
| 1701 | mips_ecoff_swap_scnhdr_out, |
| 1702 | FILHSZ, AOUTSZ, SCNHSZ, 0, 0, 0, true, |
| 1703 | mips_ecoff_swap_filehdr_in, mips_ecoff_swap_aouthdr_in, |
| 1704 | mips_ecoff_swap_scnhdr_in, mips_ecoff_bad_format_hook, |
| 1705 | ecoff_set_arch_mach_hook, ecoff_mkobject_hook, |
| 1706 | ecoff_styp_to_sec_flags, ecoff_make_section_hook, ecoff_set_alignment_hook, |
| 1707 | ecoff_slurp_symbol_table, NULL, NULL |
| 1708 | }, |
| 1709 | /* Supported architecture. */ |
| 1710 | bfd_arch_mips, |
| 1711 | /* Initial portion of armap string. */ |
| 1712 | "__________", |
| 1713 | /* The page boundary used to align sections in a demand-paged |
| 1714 | executable file. E.g., 0x1000. */ |
| 1715 | 0x1000, |
| 1716 | /* True if the .rdata section is part of the text segment, as on the |
| 1717 | Alpha. False if .rdata is part of the data segment, as on the |
| 1718 | MIPS. */ |
| 1719 | false, |
| 1720 | /* Bitsize of constructor entries. */ |
| 1721 | 32, |
| 1722 | /* Reloc to use for constructor entries. */ |
| 1723 | &mips_howto_table[MIPS_R_REFWORD], |
| 1724 | { |
| 1725 | /* Symbol table magic number. */ |
| 1726 | magicSym, |
| 1727 | /* Alignment of debugging information. E.g., 4. */ |
| 1728 | 4, |
| 1729 | /* Sizes of external symbolic information. */ |
| 1730 | sizeof (struct hdr_ext), |
| 1731 | sizeof (struct dnr_ext), |
| 1732 | sizeof (struct pdr_ext), |
| 1733 | sizeof (struct sym_ext), |
| 1734 | sizeof (struct opt_ext), |
| 1735 | sizeof (struct fdr_ext), |
| 1736 | sizeof (struct rfd_ext), |
| 1737 | sizeof (struct ext_ext), |
| 1738 | /* Functions to swap in external symbolic data. */ |
| 1739 | ecoff_swap_hdr_in, |
| 1740 | ecoff_swap_dnr_in, |
| 1741 | ecoff_swap_pdr_in, |
| 1742 | ecoff_swap_sym_in, |
| 1743 | ecoff_swap_opt_in, |
| 1744 | ecoff_swap_fdr_in, |
| 1745 | ecoff_swap_rfd_in, |
| 1746 | ecoff_swap_ext_in, |
| 1747 | /* Functions to swap out external symbolic data. */ |
| 1748 | ecoff_swap_hdr_out, |
| 1749 | ecoff_swap_dnr_out, |
| 1750 | ecoff_swap_pdr_out, |
| 1751 | ecoff_swap_sym_out, |
| 1752 | ecoff_swap_opt_out, |
| 1753 | ecoff_swap_fdr_out, |
| 1754 | ecoff_swap_rfd_out, |
| 1755 | ecoff_swap_ext_out |
| 1756 | }, |
| 1757 | /* External reloc size. */ |
| 1758 | RELSZ, |
| 1759 | /* Reloc swapping functions. */ |
| 1760 | mips_ecoff_swap_reloc_in, |
| 1761 | mips_ecoff_swap_reloc_out, |
| 1762 | /* Backend reloc tweaking. */ |
| 1763 | mips_adjust_reloc_in, |
| 1764 | mips_adjust_reloc_out, |
| 1765 | /* Relocate section contents while linking. */ |
| 1766 | mips_relocate_section |
| 1767 | }; |
| 1768 | |
| 1769 | /* Looking up a reloc type is MIPS specific. */ |
| 1770 | #define ecoff_bfd_reloc_type_lookup mips_bfd_reloc_type_lookup |
| 1771 | |
| 1772 | /* Getting relocated section contents is generic. */ |
| 1773 | #define ecoff_bfd_get_relocated_section_contents \ |
| 1774 | bfd_generic_get_relocated_section_contents |
| 1775 | |
| 1776 | /* Relaxing sections is MIPS specific. */ |
| 1777 | #define ecoff_bfd_relax_section mips_relax_section |
| 1778 | |
| 1779 | bfd_target ecoff_little_vec = |
| 1780 | { |
| 1781 | "ecoff-littlemips", /* name */ |
| 1782 | bfd_target_ecoff_flavour, |
| 1783 | false, /* data byte order is little */ |
| 1784 | false, /* header byte order is little */ |
| 1785 | |
| 1786 | (HAS_RELOC | EXEC_P | /* object flags */ |
| 1787 | HAS_LINENO | HAS_DEBUG | |
| 1788 | HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED), |
| 1789 | |
| 1790 | (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* sect |
| 1791 | flags */ |
| 1792 | 0, /* leading underscore */ |
| 1793 | ' ', /* ar_pad_char */ |
| 1794 | 15, /* ar_max_namelen */ |
| 1795 | 4, /* minimum alignment power */ |
| 1796 | bfd_getl64, bfd_getl_signed_64, bfd_putl64, |
| 1797 | bfd_getl32, bfd_getl_signed_32, bfd_putl32, |
| 1798 | bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* data */ |
| 1799 | bfd_getl64, bfd_getl_signed_64, bfd_putl64, |
| 1800 | bfd_getl32, bfd_getl_signed_32, bfd_putl32, |
| 1801 | bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* hdrs */ |
| 1802 | |
| 1803 | {_bfd_dummy_target, coff_object_p, /* bfd_check_format */ |
| 1804 | ecoff_archive_p, _bfd_dummy_target}, |
| 1805 | {bfd_false, ecoff_mkobject, /* bfd_set_format */ |
| 1806 | _bfd_generic_mkarchive, bfd_false}, |
| 1807 | {bfd_false, ecoff_write_object_contents, /* bfd_write_contents */ |
| 1808 | _bfd_write_archive_contents, bfd_false}, |
| 1809 | |
| 1810 | BFD_JUMP_TABLE_GENERIC (ecoff), |
| 1811 | BFD_JUMP_TABLE_COPY (ecoff), |
| 1812 | BFD_JUMP_TABLE_CORE (_bfd_nocore), |
| 1813 | BFD_JUMP_TABLE_ARCHIVE (ecoff), |
| 1814 | BFD_JUMP_TABLE_SYMBOLS (ecoff), |
| 1815 | BFD_JUMP_TABLE_RELOCS (ecoff), |
| 1816 | BFD_JUMP_TABLE_WRITE (ecoff), |
| 1817 | BFD_JUMP_TABLE_LINK (ecoff), |
| 1818 | |
| 1819 | (PTR) &mips_ecoff_backend_data |
| 1820 | }; |
| 1821 | |
| 1822 | bfd_target ecoff_big_vec = |
| 1823 | { |
| 1824 | "ecoff-bigmips", /* name */ |
| 1825 | bfd_target_ecoff_flavour, |
| 1826 | true, /* data byte order is big */ |
| 1827 | true, /* header byte order is big */ |
| 1828 | |
| 1829 | (HAS_RELOC | EXEC_P | /* object flags */ |
| 1830 | HAS_LINENO | HAS_DEBUG | |
| 1831 | HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED), |
| 1832 | |
| 1833 | (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* sect flags */ |
| 1834 | 0, /* leading underscore */ |
| 1835 | ' ', /* ar_pad_char */ |
| 1836 | 15, /* ar_max_namelen */ |
| 1837 | 4, /* minimum alignment power */ |
| 1838 | bfd_getb64, bfd_getb_signed_64, bfd_putb64, |
| 1839 | bfd_getb32, bfd_getb_signed_32, bfd_putb32, |
| 1840 | bfd_getb16, bfd_getb_signed_16, bfd_putb16, |
| 1841 | bfd_getb64, bfd_getb_signed_64, bfd_putb64, |
| 1842 | bfd_getb32, bfd_getb_signed_32, bfd_putb32, |
| 1843 | bfd_getb16, bfd_getb_signed_16, bfd_putb16, |
| 1844 | {_bfd_dummy_target, coff_object_p, /* bfd_check_format */ |
| 1845 | ecoff_archive_p, _bfd_dummy_target}, |
| 1846 | {bfd_false, ecoff_mkobject, /* bfd_set_format */ |
| 1847 | _bfd_generic_mkarchive, bfd_false}, |
| 1848 | {bfd_false, ecoff_write_object_contents, /* bfd_write_contents */ |
| 1849 | _bfd_write_archive_contents, bfd_false}, |
| 1850 | |
| 1851 | BFD_JUMP_TABLE_GENERIC (ecoff), |
| 1852 | BFD_JUMP_TABLE_COPY (ecoff), |
| 1853 | BFD_JUMP_TABLE_CORE (_bfd_nocore), |
| 1854 | BFD_JUMP_TABLE_ARCHIVE (ecoff), |
| 1855 | BFD_JUMP_TABLE_SYMBOLS (ecoff), |
| 1856 | BFD_JUMP_TABLE_RELOCS (ecoff), |
| 1857 | BFD_JUMP_TABLE_WRITE (ecoff), |
| 1858 | BFD_JUMP_TABLE_LINK (ecoff), |
| 1859 | |
| 1860 | (PTR) &mips_ecoff_backend_data |
| 1861 | }; |