bfd/elf32-mips.c

   1 /* MIPS-specific support for 32-bit ELF
   2    Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
   3    2003 Free Software Foundation, Inc.
   4
   5    Most of the information added by Ian Lance Taylor, Cygnus Support,
   6    <ian@cygnus.com>.
   7    N32/64 ABI support added by Mark Mitchell, CodeSourcery, LLC.
   8    <mark@codesourcery.com>
   9    Traditional MIPS targets support added by Koundinya.K, Dansk Data
  10    Elektronik & Operations Research Group. <kk@ddeorg.soft.net>
  11
  12 This file is part of BFD, the Binary File Descriptor library.
  13
  14 This program is free software; you can redistribute it and/or modify
  15 it under the terms of the GNU General Public License as published by
  16 the Free Software Foundation; either version 2 of the License, or
  17 (at your option) any later version.
  18
  19 This program is distributed in the hope that it will be useful,
  20 but WITHOUT ANY WARRANTY; without even the implied warranty of
  21 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22 GNU General Public License for more details.
  23
  24 You should have received a copy of the GNU General Public License
  25 along with this program; if not, write to the Free Software
  26 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  27
  28 /* This file handles MIPS ELF targets.  SGI Irix 5 uses a slightly
  29    different MIPS ELF from other targets.  This matters when linking.
  30    This file supports both, switching at runtime.  */
  31
  32 #include "bfd.h"
  33 #include "sysdep.h"
  34 #include "libbfd.h"
  35 #include "bfdlink.h"
  36 #include "genlink.h"
  37 #include "elf-bfd.h"
  38 #include "elfxx-mips.h"
  39 #include "elf/mips.h"
  40
  41 /* Get the ECOFF swapping routines.  */
  42 #include "coff/sym.h"
  43 #include "coff/symconst.h"
  44 #include "coff/internal.h"
  45 #include "coff/ecoff.h"
  46 #include "coff/mips.h"
  47 #define ECOFF_SIGNED_32
  48 #include "ecoffswap.h"
  49
  50 static bfd_reloc_status_type gprel32_with_gp
  51   (bfd *, asymbol *, arelent *, asection *, bfd_boolean, void *, bfd_vma);
  52 static bfd_reloc_status_type mips_elf_gprel32_reloc
  53   (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
  54 static bfd_reloc_status_type mips32_64bit_reloc
  55   (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
  56 static reloc_howto_type *bfd_elf32_bfd_reloc_type_lookup
  57   (bfd *, bfd_reloc_code_real_type);
  58 static reloc_howto_type *mips_elf32_rtype_to_howto
  59   (unsigned int, bfd_boolean);
  60 static void mips_info_to_howto_rel
  61   (bfd *, arelent *, Elf_Internal_Rela *);
  62 static void mips_info_to_howto_rela
  63   (bfd *, arelent *, Elf_Internal_Rela *);
  64 static bfd_boolean mips_elf_sym_is_global
  65   (bfd *, asymbol *);
  66 static bfd_boolean mips_elf32_object_p
  67   (bfd *);
  68 static bfd_boolean mips_elf_is_local_label_name
  69   (bfd *, const char *);
  70 static bfd_reloc_status_type mips16_jump_reloc
  71   (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
  72 static bfd_reloc_status_type mips16_gprel_reloc
  73   (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
  74 static bfd_reloc_status_type mips_elf_final_gp
  75   (bfd *, asymbol *, bfd_boolean, char **, bfd_vma *);
  76 static bfd_boolean mips_elf_assign_gp
  77   (bfd *, bfd_vma *);
  78 static bfd_boolean elf32_mips_grok_prstatus
  79   (bfd *, Elf_Internal_Note *);
  80 static bfd_boolean elf32_mips_grok_psinfo
  81   (bfd *, Elf_Internal_Note *);
  82 static irix_compat_t elf32_mips_irix_compat
  83   (bfd *);
  84
  85 extern const bfd_target bfd_elf32_bigmips_vec;
  86 extern const bfd_target bfd_elf32_littlemips_vec;
  87
  88 /* Nonzero if ABFD is using the N32 ABI.  */
  89 #define ABI_N32_P(abfd) \
  90   ((elf_elfheader (abfd)->e_flags & EF_MIPS_ABI2) != 0)
  91
  92 /* Whether we are trying to be compatible with IRIX at all.  */
  93 #define SGI_COMPAT(abfd) \
  94   (elf32_mips_irix_compat (abfd) != ict_none)
  95
  96 /* The number of local .got entries we reserve.  */
  97 #define MIPS_RESERVED_GOTNO (2)
  98
  99 /* In case we're on a 32-bit machine, construct a 64-bit "-1" value
 100    from smaller values.  Start with zero, widen, *then* decrement.  */
 101 #define MINUS_ONE       (((bfd_vma)0) - 1)
 102
 103 /* The relocation table used for SHT_REL sections.  */
 104
 105 static reloc_howto_type elf_mips_howto_table_rel[] =
 106 {
 107   /* No relocation.  */
 108   HOWTO (R_MIPS_NONE,           /* type */
 109          0,                     /* rightshift */
 110          0,                     /* size (0 = byte, 1 = short, 2 = long) */
 111          0,                     /* bitsize */
 112          FALSE,                 /* pc_relative */
 113          0,                     /* bitpos */
 114          complain_overflow_dont, /* complain_on_overflow */
 115          _bfd_mips_elf_generic_reloc, /* special_function */
 116          "R_MIPS_NONE",         /* name */
 117          FALSE,                 /* partial_inplace */
 118          0,                     /* src_mask */
 119          0,                     /* dst_mask */
 120          FALSE),                /* pcrel_offset */
 121
 122   /* 16 bit relocation.  */
 123   HOWTO (R_MIPS_16,             /* type */
 124          0,                     /* rightshift */
 125          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 126          16,                    /* bitsize */
 127          FALSE,                 /* pc_relative */
 128          0,                     /* bitpos */
 129          complain_overflow_signed, /* complain_on_overflow */
 130          _bfd_mips_elf_generic_reloc, /* special_function */
 131          "R_MIPS_16",           /* name */
 132          TRUE,                  /* partial_inplace */
 133          0x0000ffff,            /* src_mask */
 134          0x0000ffff,            /* dst_mask */
 135          FALSE),                /* pcrel_offset */
 136
 137   /* 32 bit relocation.  */
 138   HOWTO (R_MIPS_32,             /* type */
 139          0,                     /* rightshift */
 140          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 141          32,                    /* bitsize */
 142          FALSE,                 /* pc_relative */
 143          0,                     /* bitpos */
 144          complain_overflow_dont, /* complain_on_overflow */
 145          _bfd_mips_elf_generic_reloc, /* special_function */
 146          "R_MIPS_32",           /* name */
 147          TRUE,                  /* partial_inplace */
 148          0xffffffff,            /* src_mask */
 149          0xffffffff,            /* dst_mask */
 150          FALSE),                /* pcrel_offset */
 151
 152   /* 32 bit symbol relative relocation.  */
 153   HOWTO (R_MIPS_REL32,          /* type */
 154          0,                     /* rightshift */
 155          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 156          32,                    /* bitsize */
 157          FALSE,                 /* pc_relative */
 158          0,                     /* bitpos */
 159          complain_overflow_dont, /* complain_on_overflow */
 160          _bfd_mips_elf_generic_reloc, /* special_function */
 161          "R_MIPS_REL32",        /* name */
 162          TRUE,                  /* partial_inplace */
 163          0xffffffff,            /* src_mask */
 164          0xffffffff,            /* dst_mask */
 165          FALSE),                /* pcrel_offset */
 166
 167   /* 26 bit jump address.  */
 168   HOWTO (R_MIPS_26,             /* type */
 169          2,                     /* rightshift */
 170          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 171          26,                    /* bitsize */
 172          FALSE,                 /* pc_relative */
 173          0,                     /* bitpos */
 174          complain_overflow_dont, /* complain_on_overflow */
 175                                 /* This needs complex overflow
 176                                    detection, because the upper four
 177                                    bits must match the PC + 4.  */
 178          _bfd_mips_elf_generic_reloc, /* special_function */
 179          "R_MIPS_26",           /* name */
 180          TRUE,                  /* partial_inplace */
 181          0x03ffffff,            /* src_mask */
 182          0x03ffffff,            /* dst_mask */
 183          FALSE),                /* pcrel_offset */
 184
 185   /* High 16 bits of symbol value.  */
 186   HOWTO (R_MIPS_HI16,           /* type */
 187          16,                    /* rightshift */
 188          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 189          16,                    /* bitsize */
 190          FALSE,                 /* pc_relative */
 191          0,                     /* bitpos */
 192          complain_overflow_dont, /* complain_on_overflow */
 193          _bfd_mips_elf_hi16_reloc, /* special_function */
 194          "R_MIPS_HI16",         /* name */
 195          TRUE,                  /* partial_inplace */
 196          0x0000ffff,            /* src_mask */
 197          0x0000ffff,            /* dst_mask */
 198          FALSE),                /* pcrel_offset */
 199
 200   /* Low 16 bits of symbol value.  */
 201   HOWTO (R_MIPS_LO16,           /* type */
 202          0,                     /* rightshift */
 203          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 204          16,                    /* bitsize */
 205          FALSE,                 /* pc_relative */
 206          0,                     /* bitpos */
 207          complain_overflow_dont, /* complain_on_overflow */
 208          _bfd_mips_elf_lo16_reloc, /* special_function */
 209          "R_MIPS_LO16",         /* name */
 210          TRUE,                  /* partial_inplace */
 211          0x0000ffff,            /* src_mask */
 212          0x0000ffff,            /* dst_mask */
 213          FALSE),                /* pcrel_offset */
 214
 215   /* GP relative reference.  */
 216   HOWTO (R_MIPS_GPREL16,        /* type */
 217          0,                     /* rightshift */
 218          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 219          16,                    /* bitsize */
 220          FALSE,                 /* pc_relative */
 221          0,                     /* bitpos */
 222          complain_overflow_signed, /* complain_on_overflow */
 223          _bfd_mips_elf32_gprel16_reloc, /* special_function */
 224          "R_MIPS_GPREL16",      /* name */
 225          TRUE,                  /* partial_inplace */
 226          0x0000ffff,            /* src_mask */
 227          0x0000ffff,            /* dst_mask */
 228          FALSE),                /* pcrel_offset */
 229
 230   /* Reference to literal section.  */
 231   HOWTO (R_MIPS_LITERAL,        /* type */
 232          0,                     /* rightshift */
 233          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 234          16,                    /* bitsize */
 235          FALSE,                 /* pc_relative */
 236          0,                     /* bitpos */
 237          complain_overflow_signed, /* complain_on_overflow */
 238          _bfd_mips_elf32_gprel16_reloc, /* special_function */
 239          "R_MIPS_LITERAL",      /* name */
 240          TRUE,                  /* partial_inplace */
 241          0x0000ffff,            /* src_mask */
 242          0x0000ffff,            /* dst_mask */
 243          FALSE),                /* pcrel_offset */
 244
 245   /* Reference to global offset table.  */
 246   HOWTO (R_MIPS_GOT16,          /* type */
 247          0,                     /* rightshift */
 248          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 249          16,                    /* bitsize */
 250          FALSE,                 /* pc_relative */
 251          0,                     /* bitpos */
 252          complain_overflow_signed, /* complain_on_overflow */
 253          _bfd_mips_elf_got16_reloc, /* special_function */
 254          "R_MIPS_GOT16",        /* name */
 255          TRUE,                  /* partial_inplace */
 256          0x0000ffff,            /* src_mask */
 257          0x0000ffff,            /* dst_mask */
 258          FALSE),                /* pcrel_offset */
 259
 260   /* 16 bit PC relative reference.  */
 261   HOWTO (R_MIPS_PC16,           /* type */
 262          0,                     /* rightshift */
 263          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 264          16,                    /* bitsize */
 265          TRUE,                  /* pc_relative */
 266          0,                     /* bitpos */
 267          complain_overflow_signed, /* complain_on_overflow */
 268          _bfd_mips_elf_generic_reloc, /* special_function */
 269          "R_MIPS_PC16",         /* name */
 270          TRUE,                  /* partial_inplace */
 271          0x0000ffff,            /* src_mask */
 272          0x0000ffff,            /* dst_mask */
 273          TRUE),                 /* pcrel_offset */
 274
 275   /* 16 bit call through global offset table.  */
 276   HOWTO (R_MIPS_CALL16,         /* type */
 277          0,                     /* rightshift */
 278          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 279          16,                    /* bitsize */
 280          FALSE,                 /* pc_relative */
 281          0,                     /* bitpos */
 282          complain_overflow_signed, /* complain_on_overflow */
 283          _bfd_mips_elf_generic_reloc, /* special_function */
 284          "R_MIPS_CALL16",       /* name */
 285          TRUE,                  /* partial_inplace */
 286          0x0000ffff,            /* src_mask */
 287          0x0000ffff,            /* dst_mask */
 288          FALSE),                /* pcrel_offset */
 289
 290   /* 32 bit GP relative reference.  */
 291   HOWTO (R_MIPS_GPREL32,        /* type */
 292          0,                     /* rightshift */
 293          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 294          32,                    /* bitsize */
 295          FALSE,                 /* pc_relative */
 296          0,                     /* bitpos */
 297          complain_overflow_dont, /* complain_on_overflow */
 298          mips_elf_gprel32_reloc, /* special_function */
 299          "R_MIPS_GPREL32",      /* name */
 300          TRUE,                  /* partial_inplace */
 301          0xffffffff,            /* src_mask */
 302          0xffffffff,            /* dst_mask */
 303          FALSE),                /* pcrel_offset */
 304
 305   /* The remaining relocs are defined on Irix 5, although they are
 306      not defined by the ABI.  */
 307   EMPTY_HOWTO (13),
 308   EMPTY_HOWTO (14),
 309   EMPTY_HOWTO (15),
 310
 311   /* A 5 bit shift field.  */
 312   HOWTO (R_MIPS_SHIFT5,         /* type */
 313          0,                     /* rightshift */
 314          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 315          5,                     /* bitsize */
 316          FALSE,                 /* pc_relative */
 317          6,                     /* bitpos */
 318          complain_overflow_bitfield, /* complain_on_overflow */
 319          _bfd_mips_elf_generic_reloc, /* special_function */
 320          "R_MIPS_SHIFT5",       /* name */
 321          TRUE,                  /* partial_inplace */
 322          0x000007c0,            /* src_mask */
 323          0x000007c0,            /* dst_mask */
 324          FALSE),                /* pcrel_offset */
 325
 326   /* A 6 bit shift field.  */
 327   /* FIXME: This is not handled correctly; a special function is
 328      needed to put the most significant bit in the right place.  */
 329   HOWTO (R_MIPS_SHIFT6,         /* type */
 330          0,                     /* rightshift */
 331          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 332          6,                     /* bitsize */
 333          FALSE,                 /* pc_relative */
 334          6,                     /* bitpos */
 335          complain_overflow_bitfield, /* complain_on_overflow */
 336          _bfd_mips_elf_generic_reloc, /* special_function */
 337          "R_MIPS_SHIFT6",       /* name */
 338          TRUE,                  /* partial_inplace */
 339          0x000007c4,            /* src_mask */
 340          0x000007c4,            /* dst_mask */
 341          FALSE),                /* pcrel_offset */
 342
 343   /* A 64 bit relocation.  */
 344   HOWTO (R_MIPS_64,             /* type */
 345          0,                     /* rightshift */
 346          4,                     /* size (0 = byte, 1 = short, 2 = long) */
 347          64,                    /* bitsize */
 348          FALSE,                 /* pc_relative */
 349          0,                     /* bitpos */
 350          complain_overflow_dont, /* complain_on_overflow */
 351          mips32_64bit_reloc,    /* special_function */
 352          "R_MIPS_64",           /* name */
 353          TRUE,                  /* partial_inplace */
 354          MINUS_ONE,             /* src_mask */
 355          MINUS_ONE,             /* dst_mask */
 356          FALSE),                /* pcrel_offset */
 357
 358   /* Displacement in the global offset table.  */
 359   HOWTO (R_MIPS_GOT_DISP,       /* type */
 360          0,                     /* rightshift */
 361          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 362          16,                    /* bitsize */
 363          FALSE,                 /* pc_relative */
 364          0,                     /* bitpos */
 365          complain_overflow_signed, /* complain_on_overflow */
 366          _bfd_mips_elf_generic_reloc, /* special_function */
 367          "R_MIPS_GOT_DISP",     /* name */
 368          TRUE,                  /* partial_inplace */
 369          0x0000ffff,            /* src_mask */
 370          0x0000ffff,            /* dst_mask */
 371          FALSE),                /* pcrel_offset */
 372
 373   /* Displacement to page pointer in the global offset table.  */
 374   HOWTO (R_MIPS_GOT_PAGE,       /* type */
 375          0,                     /* rightshift */
 376          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 377          16,                    /* bitsize */
 378          FALSE,                 /* pc_relative */
 379          0,                     /* bitpos */
 380          complain_overflow_signed, /* complain_on_overflow */
 381          _bfd_mips_elf_generic_reloc, /* special_function */
 382          "R_MIPS_GOT_PAGE",     /* name */
 383          TRUE,                  /* partial_inplace */
 384          0x0000ffff,            /* src_mask */
 385          0x0000ffff,            /* dst_mask */
 386          FALSE),                /* pcrel_offset */
 387
 388   /* Offset from page pointer in the global offset table.  */
 389   HOWTO (R_MIPS_GOT_OFST,       /* type */
 390          0,                     /* rightshift */
 391          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 392          16,                    /* bitsize */
 393          FALSE,                 /* pc_relative */
 394          0,                     /* bitpos */
 395          complain_overflow_signed, /* complain_on_overflow */
 396          _bfd_mips_elf_generic_reloc, /* special_function */
 397          "R_MIPS_GOT_OFST",     /* name */
 398          TRUE,                  /* partial_inplace */
 399          0x0000ffff,            /* src_mask */
 400          0x0000ffff,            /* dst_mask */
 401          FALSE),                /* pcrel_offset */
 402
 403   /* High 16 bits of displacement in global offset table.  */
 404   HOWTO (R_MIPS_GOT_HI16,       /* type */
 405          0,                     /* rightshift */
 406          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 407          16,                    /* bitsize */
 408          FALSE,                 /* pc_relative */
 409          0,                     /* bitpos */
 410          complain_overflow_dont, /* complain_on_overflow */
 411          _bfd_mips_elf_generic_reloc, /* special_function */
 412          "R_MIPS_GOT_HI16",     /* name */
 413          TRUE,                  /* partial_inplace */
 414          0x0000ffff,            /* src_mask */
 415          0x0000ffff,            /* dst_mask */
 416          FALSE),                /* pcrel_offset */
 417
 418   /* Low 16 bits of displacement in global offset table.  */
 419   HOWTO (R_MIPS_GOT_LO16,       /* type */
 420          0,                     /* rightshift */
 421          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 422          16,                    /* bitsize */
 423          FALSE,                 /* pc_relative */
 424          0,                     /* bitpos */
 425          complain_overflow_dont, /* complain_on_overflow */
 426          _bfd_mips_elf_generic_reloc, /* special_function */
 427          "R_MIPS_GOT_LO16",     /* name */
 428          TRUE,                  /* partial_inplace */
 429          0x0000ffff,            /* src_mask */
 430          0x0000ffff,            /* dst_mask */
 431          FALSE),                /* pcrel_offset */
 432
 433   /* 64 bit subtraction.  Used in the N32 ABI.  */
 434   HOWTO (R_MIPS_SUB,            /* type */
 435          0,                     /* rightshift */
 436          4,                     /* size (0 = byte, 1 = short, 2 = long) */
 437          64,                    /* bitsize */
 438          FALSE,                 /* pc_relative */
 439          0,                     /* bitpos */
 440          complain_overflow_dont, /* complain_on_overflow */
 441          _bfd_mips_elf_generic_reloc, /* special_function */
 442          "R_MIPS_SUB",          /* name */
 443          TRUE,                  /* partial_inplace */
 444          MINUS_ONE,             /* src_mask */
 445          MINUS_ONE,             /* dst_mask */
 446          FALSE),                /* pcrel_offset */
 447
 448   /* Used to cause the linker to insert and delete instructions?  */
 449   EMPTY_HOWTO (R_MIPS_INSERT_A),
 450   EMPTY_HOWTO (R_MIPS_INSERT_B),
 451   EMPTY_HOWTO (R_MIPS_DELETE),
 452
 453   /* Get the higher value of a 64 bit addend.  */
 454   HOWTO (R_MIPS_HIGHER,         /* type */
 455          0,                     /* rightshift */
 456          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 457          16,                    /* bitsize */
 458          FALSE,                 /* pc_relative */
 459          0,                     /* bitpos */
 460          complain_overflow_dont, /* complain_on_overflow */
 461          _bfd_mips_elf_generic_reloc, /* special_function */
 462          "R_MIPS_HIGHER",       /* name */
 463          TRUE,                  /* partial_inplace */
 464          0x0000ffff,            /* src_mask */
 465          0x0000ffff,            /* dst_mask */
 466          FALSE),                /* pcrel_offset */
 467
 468   /* Get the highest value of a 64 bit addend.  */
 469   HOWTO (R_MIPS_HIGHEST,        /* type */
 470          0,                     /* rightshift */
 471          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 472          16,                    /* bitsize */
 473          FALSE,                 /* pc_relative */
 474          0,                     /* bitpos */
 475          complain_overflow_dont, /* complain_on_overflow */
 476          _bfd_mips_elf_generic_reloc, /* special_function */
 477          "R_MIPS_HIGHEST",      /* name */
 478          TRUE,                  /* partial_inplace */
 479          0x0000ffff,            /* src_mask */
 480          0x0000ffff,            /* dst_mask */
 481          FALSE),                /* pcrel_offset */
 482
 483   /* High 16 bits of displacement in global offset table.  */
 484   HOWTO (R_MIPS_CALL_HI16,      /* type */
 485          0,                     /* rightshift */
 486          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 487          16,                    /* bitsize */
 488          FALSE,                 /* pc_relative */
 489          0,                     /* bitpos */
 490          complain_overflow_dont, /* complain_on_overflow */
 491          _bfd_mips_elf_generic_reloc, /* special_function */
 492          "R_MIPS_CALL_HI16",    /* name */
 493          TRUE,                  /* partial_inplace */
 494          0x0000ffff,            /* src_mask */
 495          0x0000ffff,            /* dst_mask */
 496          FALSE),                /* pcrel_offset */
 497
 498   /* Low 16 bits of displacement in global offset table.  */
 499   HOWTO (R_MIPS_CALL_LO16,      /* type */
 500          0,                     /* rightshift */
 501          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 502          16,                    /* bitsize */
 503          FALSE,                 /* pc_relative */
 504          0,                     /* bitpos */
 505          complain_overflow_dont, /* complain_on_overflow */
 506          _bfd_mips_elf_generic_reloc, /* special_function */
 507          "R_MIPS_CALL_LO16",    /* name */
 508          TRUE,                  /* partial_inplace */
 509          0x0000ffff,            /* src_mask */
 510          0x0000ffff,            /* dst_mask */
 511          FALSE),                /* pcrel_offset */
 512
 513   /* Section displacement.  */
 514   HOWTO (R_MIPS_SCN_DISP,       /* type */
 515          0,                     /* rightshift */
 516          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 517          32,                    /* bitsize */
 518          FALSE,                 /* pc_relative */
 519          0,                     /* bitpos */
 520          complain_overflow_dont, /* complain_on_overflow */
 521          _bfd_mips_elf_generic_reloc, /* special_function */
 522          "R_MIPS_SCN_DISP",     /* name */
 523          TRUE,                  /* partial_inplace */
 524          0xffffffff,            /* src_mask */
 525          0xffffffff,            /* dst_mask */
 526          FALSE),                /* pcrel_offset */
 527
 528   EMPTY_HOWTO (R_MIPS_REL16),
 529   EMPTY_HOWTO (R_MIPS_ADD_IMMEDIATE),
 530   EMPTY_HOWTO (R_MIPS_PJUMP),
 531   EMPTY_HOWTO (R_MIPS_RELGOT),
 532
 533   /* Protected jump conversion.  This is an optimization hint.  No
 534      relocation is required for correctness.  */
 535   HOWTO (R_MIPS_JALR,           /* type */
 536          0,                     /* rightshift */
 537          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 538          32,                    /* bitsize */
 539          FALSE,                 /* pc_relative */
 540          0,                     /* bitpos */
 541          complain_overflow_dont, /* complain_on_overflow */
 542          _bfd_mips_elf_generic_reloc, /* special_function */
 543          "R_MIPS_JALR",         /* name */
 544          FALSE,                 /* partial_inplace */
 545          0x00000000,            /* src_mask */
 546          0x00000000,            /* dst_mask */
 547          FALSE),                /* pcrel_offset */
 548 };
 549
 550 /* The reloc used for BFD_RELOC_CTOR when doing a 64 bit link.  This
 551    is a hack to make the linker think that we need 64 bit values.  */
 552 static reloc_howto_type elf_mips_ctor64_howto =
 553   HOWTO (R_MIPS_64,             /* type */
 554          0,                     /* rightshift */
 555          4,                     /* size (0 = byte, 1 = short, 2 = long) */
 556          32,                    /* bitsize */
 557          FALSE,                 /* pc_relative */
 558          0,                     /* bitpos */
 559          complain_overflow_signed, /* complain_on_overflow */
 560          mips32_64bit_reloc,    /* special_function */
 561          "R_MIPS_64",           /* name */
 562          TRUE,                  /* partial_inplace */
 563          0xffffffff,            /* src_mask */
 564          0xffffffff,            /* dst_mask */
 565          FALSE);                /* pcrel_offset */
 566
 567 /* The reloc used for the mips16 jump instruction.  */
 568 static reloc_howto_type elf_mips16_jump_howto =
 569   HOWTO (R_MIPS16_26,           /* type */
 570          2,                     /* rightshift */
 571          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 572          26,                    /* bitsize */
 573          FALSE,                 /* pc_relative */
 574          0,                     /* bitpos */
 575          complain_overflow_dont, /* complain_on_overflow */
 576                                 /* This needs complex overflow
 577                                    detection, because the upper four
 578                                    bits must match the PC.  */
 579          mips16_jump_reloc,     /* special_function */
 580          "R_MIPS16_26",         /* name */
 581          TRUE,                  /* partial_inplace */
 582          0x3ffffff,             /* src_mask */
 583          0x3ffffff,             /* dst_mask */
 584          FALSE);                /* pcrel_offset */
 585
 586 /* The reloc used for the mips16 gprel instruction.  */
 587 static reloc_howto_type elf_mips16_gprel_howto =
 588   HOWTO (R_MIPS16_GPREL,        /* type */
 589          0,                     /* rightshift */
 590          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 591          16,                    /* bitsize */
 592          FALSE,                 /* pc_relative */
 593          0,                     /* bitpos */
 594          complain_overflow_signed, /* complain_on_overflow */
 595          mips16_gprel_reloc,    /* special_function */
 596          "R_MIPS16_GPREL",      /* name */
 597          TRUE,                  /* partial_inplace */
 598          0x07ff001f,            /* src_mask */
 599          0x07ff001f,            /* dst_mask */
 600          FALSE);                /* pcrel_offset */
 601
 602 /* 16 bit offset for pc-relative branches.  */
 603 static reloc_howto_type elf_mips_gnu_rel16_s2 =
 604   HOWTO (R_MIPS_GNU_REL16_S2,   /* type */
 605          2,                     /* rightshift */
 606          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 607          16,                    /* bitsize */
 608          TRUE,                  /* pc_relative */
 609          0,                     /* bitpos */
 610          complain_overflow_signed, /* complain_on_overflow */
 611          _bfd_mips_elf_generic_reloc, /* special_function */
 612          "R_MIPS_GNU_REL16_S2", /* name */
 613          TRUE,                  /* partial_inplace */
 614          0xffff,                /* src_mask */
 615          0xffff,                /* dst_mask */
 616          TRUE);                 /* pcrel_offset */
 617
 618 /* GNU extension to record C++ vtable hierarchy */
 619 static reloc_howto_type elf_mips_gnu_vtinherit_howto =
 620   HOWTO (R_MIPS_GNU_VTINHERIT,  /* type */
 621          0,                     /* rightshift */
 622          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 623          0,                     /* bitsize */
 624          FALSE,                 /* pc_relative */
 625          0,                     /* bitpos */
 626          complain_overflow_dont, /* complain_on_overflow */
 627          NULL,                  /* special_function */
 628          "R_MIPS_GNU_VTINHERIT", /* name */
 629          FALSE,                 /* partial_inplace */
 630          0,                     /* src_mask */
 631          0,                     /* dst_mask */
 632          FALSE);                /* pcrel_offset */
 633
 634 /* GNU extension to record C++ vtable member usage */
 635 static reloc_howto_type elf_mips_gnu_vtentry_howto =
 636   HOWTO (R_MIPS_GNU_VTENTRY,    /* type */
 637          0,                     /* rightshift */
 638          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 639          0,                     /* bitsize */
 640          FALSE,                 /* pc_relative */
 641          0,                     /* bitpos */
 642          complain_overflow_dont, /* complain_on_overflow */
 643          _bfd_elf_rel_vtable_reloc_fn, /* special_function */
 644          "R_MIPS_GNU_VTENTRY",  /* name */
 645          FALSE,                 /* partial_inplace */
 646          0,                     /* src_mask */
 647          0,                     /* dst_mask */
 648          FALSE);                /* pcrel_offset */
 649
 650 /* Set the GP value for OUTPUT_BFD.  Returns FALSE if this is a
 651    dangerous relocation.  */
 652
 653 static bfd_boolean
 654 mips_elf_assign_gp (bfd *output_bfd, bfd_vma *pgp)
 655 {
 656   unsigned int count;
 657   asymbol **sym;
 658   unsigned int i;
 659
 660   /* If we've already figured out what GP will be, just return it.  */
 661   *pgp = _bfd_get_gp_value (output_bfd);
 662   if (*pgp)
 663     return TRUE;
 664
 665   count = bfd_get_symcount (output_bfd);
 666   sym = bfd_get_outsymbols (output_bfd);
 667
 668   /* The linker script will have created a symbol named `_gp' with the
 669      appropriate value.  */
 670   if (sym == NULL)
 671     i = count;
 672   else
 673     {
 674       for (i = 0; i < count; i++, sym++)
 675         {
 676           register const char *name;
 677
 678           name = bfd_asymbol_name (*sym);
 679           if (*name == '_' && strcmp (name, "_gp") == 0)
 680             {
 681               *pgp = bfd_asymbol_value (*sym);
 682               _bfd_set_gp_value (output_bfd, *pgp);
 683               break;
 684             }
 685         }
 686     }
 687
 688   if (i >= count)
 689     {
 690       /* Only get the error once.  */
 691       *pgp = 4;
 692       _bfd_set_gp_value (output_bfd, *pgp);
 693       return FALSE;
 694     }
 695
 696   return TRUE;
 697 }
 698
 699 /* We have to figure out the gp value, so that we can adjust the
 700    symbol value correctly.  We look up the symbol _gp in the output
 701    BFD.  If we can't find it, we're stuck.  We cache it in the ELF
 702    target data.  We don't need to adjust the symbol value for an
 703    external symbol if we are producing relocatable output.  */
 704
 705 static bfd_reloc_status_type
 706 mips_elf_final_gp (bfd *output_bfd, asymbol *symbol, bfd_boolean relocatable,
 707                    char **error_message, bfd_vma *pgp)
 708 {
 709   if (bfd_is_und_section (symbol->section)
 710       && ! relocatable)
 711     {
 712       *pgp = 0;
 713       return bfd_reloc_undefined;
 714     }
 715
 716   *pgp = _bfd_get_gp_value (output_bfd);
 717   if (*pgp == 0
 718       && (! relocatable
 719           || (symbol->flags & BSF_SECTION_SYM) != 0))
 720     {
 721       if (relocatable)
 722         {
 723           /* Make up a value.  */
 724           *pgp = symbol->section->output_section->vma + 0x4000;
 725           _bfd_set_gp_value (output_bfd, *pgp);
 726         }
 727       else if (!mips_elf_assign_gp (output_bfd, pgp))
 728         {
 729           *error_message =
 730             (char *) _("GP relative relocation when _gp not defined");
 731           return bfd_reloc_dangerous;
 732         }
 733     }
 734
 735   return bfd_reloc_ok;
 736 }
 737
 738 /* Do a R_MIPS_GPREL16 relocation.  This is a 16 bit value which must
 739    become the offset from the gp register.  This function also handles
 740    R_MIPS_LITERAL relocations, although those can be handled more
 741    cleverly because the entries in the .lit8 and .lit4 sections can be
 742    merged.  */
 743
 744 bfd_reloc_status_type
 745 _bfd_mips_elf32_gprel16_reloc (bfd *abfd, arelent *reloc_entry,
 746                                asymbol *symbol, void *data,
 747                                asection *input_section, bfd *output_bfd,
 748                                char **error_message)
 749 {
 750   bfd_boolean relocatable;
 751   bfd_reloc_status_type ret;
 752   bfd_vma gp;
 753
 754   if (output_bfd != NULL)
 755     relocatable = TRUE;
 756   else
 757     {
 758       relocatable = FALSE;
 759       output_bfd = symbol->section->output_section->owner;
 760     }
 761
 762   ret = mips_elf_final_gp (output_bfd, symbol, relocatable, error_message,
 763                            &gp);
 764   if (ret != bfd_reloc_ok)
 765     return ret;
 766
 767   return _bfd_mips_elf_gprel16_with_gp (abfd, symbol, reloc_entry,
 768                                         input_section, relocatable,
 769                                         data, gp);
 770 }
 771
 772 /* Do a R_MIPS_GPREL32 relocation.  This is a 32 bit value which must
 773    become the offset from the gp register.  */
 774
 775 static bfd_reloc_status_type
 776 mips_elf_gprel32_reloc (bfd *abfd, arelent *reloc_entry, asymbol *symbol,
 777                         void *data, asection *input_section, bfd *output_bfd,
 778                         char **error_message)
 779 {
 780   bfd_boolean relocatable;
 781   bfd_reloc_status_type ret;
 782   bfd_vma gp;
 783
 784   if (output_bfd != NULL)
 785     relocatable = TRUE;
 786   else
 787     {
 788       relocatable = FALSE;
 789       output_bfd = symbol->section->output_section->owner;
 790     }
 791
 792   ret = mips_elf_final_gp (output_bfd, symbol, relocatable,
 793                            error_message, &gp);
 794   if (ret != bfd_reloc_ok)
 795     return ret;
 796
 797   return gprel32_with_gp (abfd, symbol, reloc_entry, input_section,
 798                           relocatable, data, gp);
 799 }
 800
 801 static bfd_reloc_status_type
 802 gprel32_with_gp (bfd *abfd, asymbol *symbol, arelent *reloc_entry,
 803                  asection *input_section, bfd_boolean relocatable,
 804                  void *data, bfd_vma gp)
 805 {
 806   bfd_vma relocation;
 807   bfd_vma val;
 808
 809   if (bfd_is_com_section (symbol->section))
 810     relocation = 0;
 811   else
 812     relocation = symbol->value;
 813
 814   relocation += symbol->section->output_section->vma;
 815   relocation += symbol->section->output_offset;
 816
 817   if (reloc_entry->address > input_section->_cooked_size)
 818     return bfd_reloc_outofrange;
 819
 820   /* Set val to the offset into the section or symbol.  */
 821   val = reloc_entry->addend;
 822
 823   if (reloc_entry->howto->partial_inplace)
 824     val += bfd_get_32 (abfd, (bfd_byte *) data + reloc_entry->address);
 825
 826   /* Adjust val for the final section location and GP value.  If we
 827      are producing relocatable output, we don't want to do this for
 828      an external symbol.  */
 829   if (! relocatable
 830       || (symbol->flags & BSF_SECTION_SYM) != 0)
 831     val += relocation - gp;
 832
 833   if (reloc_entry->howto->partial_inplace)
 834     bfd_put_32 (abfd, val, (bfd_byte *) data + reloc_entry->address);
 835   else
 836     reloc_entry->addend = val;
 837
 838   if (relocatable)
 839     reloc_entry->address += input_section->output_offset;
 840
 841   return bfd_reloc_ok;
 842 }
 843
 844 /* Handle a 64 bit reloc in a 32 bit MIPS ELF file.  These are
 845    generated when addresses are 64 bits.  The upper 32 bits are a simple
 846    sign extension.  */
 847
 848 static bfd_reloc_status_type
 849 mips32_64bit_reloc (bfd *abfd, arelent *reloc_entry,
 850                     asymbol *symbol ATTRIBUTE_UNUSED,
 851                     void *data, asection *input_section,
 852                     bfd *output_bfd, char **error_message)
 853 {
 854   bfd_reloc_status_type r;
 855   arelent reloc32;
 856   unsigned long val;
 857   bfd_size_type addr;
 858
 859   /* Do a normal 32 bit relocation on the lower 32 bits.  */
 860   reloc32 = *reloc_entry;
 861   if (bfd_big_endian (abfd))
 862     reloc32.address += 4;
 863   reloc32.howto = &elf_mips_howto_table_rel[R_MIPS_32];
 864   r = bfd_perform_relocation (abfd, &reloc32, data, input_section,
 865                               output_bfd, error_message);
 866
 867   /* Sign extend into the upper 32 bits.  */
 868   val = bfd_get_32 (abfd, (bfd_byte *) data + reloc32.address);
 869   if ((val & 0x80000000) != 0)
 870     val = 0xffffffff;
 871   else
 872     val = 0;
 873   addr = reloc_entry->address;
 874   if (bfd_little_endian (abfd))
 875     addr += 4;
 876   bfd_put_32 (abfd, val, (bfd_byte *) data + addr);
 877
 878   return r;
 879 }
 880
 881 /* Handle a mips16 jump.  */
 882
 883 static bfd_reloc_status_type
 884 mips16_jump_reloc (bfd *abfd ATTRIBUTE_UNUSED, arelent *reloc_entry,
 885                    asymbol *symbol, void *data ATTRIBUTE_UNUSED,
 886                    asection *input_section, bfd *output_bfd,
 887                    char **error_message ATTRIBUTE_UNUSED)
 888 {
 889   if (output_bfd != NULL
 890       && (symbol->flags & BSF_SECTION_SYM) == 0
 891       && reloc_entry->addend == 0)
 892     {
 893       reloc_entry->address += input_section->output_offset;
 894       return bfd_reloc_ok;
 895     }
 896
 897   /* FIXME.  */
 898   {
 899     static bfd_boolean warned;
 900
 901     if (! warned)
 902       (*_bfd_error_handler)
 903         (_("Linking mips16 objects into %s format is not supported"),
 904          bfd_get_target (input_section->output_section->owner));
 905     warned = TRUE;
 906   }
 907
 908   return bfd_reloc_undefined;
 909 }
 910
 911 /* Handle a mips16 GP relative reloc.  */
 912
 913 static bfd_reloc_status_type
 914 mips16_gprel_reloc (bfd *abfd, arelent *reloc_entry, asymbol *symbol,
 915                     void *data, asection *input_section, bfd *output_bfd,
 916                     char **error_message)
 917 {
 918   bfd_boolean relocatable;
 919   bfd_reloc_status_type ret;
 920   bfd_vma gp;
 921   unsigned short extend = 0;
 922   unsigned short insn = 0;
 923   bfd_signed_vma val;
 924   bfd_vma relocation;
 925
 926   /* If we're relocating, and this is an external symbol, we don't want
 927      to change anything.  */
 928   if (output_bfd != NULL
 929       && (symbol->flags & BSF_SECTION_SYM) == 0
 930       && (symbol->flags & BSF_LOCAL) != 0)
 931     {
 932       reloc_entry->address += input_section->output_offset;
 933       return bfd_reloc_ok;
 934     }
 935
 936   if (output_bfd != NULL)
 937     relocatable = TRUE;
 938   else
 939     {
 940       relocatable = FALSE;
 941       output_bfd = symbol->section->output_section->owner;
 942     }
 943
 944   ret = mips_elf_final_gp (output_bfd, symbol, relocatable, error_message,
 945                            &gp);
 946   if (ret != bfd_reloc_ok)
 947     return ret;
 948
 949   if (reloc_entry->address > input_section->_cooked_size)
 950     return bfd_reloc_outofrange;
 951
 952   if (bfd_is_com_section (symbol->section))
 953     relocation = 0;
 954   else
 955     relocation = symbol->value;
 956
 957   relocation += symbol->section->output_section->vma;
 958   relocation += symbol->section->output_offset;
 959
 960   /* Set val to the offset into the section or symbol.  */
 961   val = reloc_entry->addend;
 962
 963   if (reloc_entry->howto->partial_inplace)
 964     {
 965       /* Pick up the mips16 extend instruction and the real instruction.  */
 966       extend = bfd_get_16 (abfd, (bfd_byte *) data + reloc_entry->address);
 967       insn = bfd_get_16 (abfd, (bfd_byte *) data + reloc_entry->address + 2);
 968       val += ((extend & 0x1f) << 11) | (extend & 0x7e0) | (insn & 0x1f);
 969     }
 970
 971   _bfd_mips_elf_sign_extend(val, 16);
 972
 973   /* Adjust val for the final section location and GP value.  If we
 974      are producing relocatable output, we don't want to do this for
 975      an external symbol.  */
 976   if (! relocatable
 977       || (symbol->flags & BSF_SECTION_SYM) != 0)
 978     val += relocation - gp;
 979
 980   if (reloc_entry->howto->partial_inplace)
 981     {
 982       bfd_put_16 (abfd,
 983                   (extend & 0xf800) | ((val >> 11) & 0x1f) | (val & 0x7e0),
 984                   (bfd_byte *) data + reloc_entry->address);
 985       bfd_put_16 (abfd,
 986                   (insn & 0xffe0) | (val & 0x1f),
 987                   (bfd_byte *) data + reloc_entry->address + 2);
 988     }
 989   else
 990     reloc_entry->addend = val;
 991
 992   if (relocatable)
 993     reloc_entry->address += input_section->output_offset;
 994   else if (((val & ~0xffff) != ~0xffff) && ((val & ~0xffff) != 0))
 995     return bfd_reloc_overflow;
 996
 997   return bfd_reloc_ok;
 998 }
 999
1000 /* A mapping from BFD reloc types to MIPS ELF reloc types.  */
1001
1002 struct elf_reloc_map {
1003   bfd_reloc_code_real_type bfd_val;
1004   enum elf_mips_reloc_type elf_val;
1005 };
1006
1007 static const struct elf_reloc_map mips_reloc_map[] =
1008 {
1009   { BFD_RELOC_NONE, R_MIPS_NONE },
1010   { BFD_RELOC_16, R_MIPS_16 },
1011   { BFD_RELOC_32, R_MIPS_32 },
1012   /* There is no BFD reloc for R_MIPS_REL32.  */
1013   { BFD_RELOC_64, R_MIPS_64 },
1014   { BFD_RELOC_MIPS_JMP, R_MIPS_26 },
1015   { BFD_RELOC_HI16_S, R_MIPS_HI16 },
1016   { BFD_RELOC_LO16, R_MIPS_LO16 },
1017   { BFD_RELOC_GPREL16, R_MIPS_GPREL16 },
1018   { BFD_RELOC_MIPS_LITERAL, R_MIPS_LITERAL },
1019   { BFD_RELOC_MIPS_GOT16, R_MIPS_GOT16 },
1020   { BFD_RELOC_16_PCREL, R_MIPS_PC16 },
1021   { BFD_RELOC_MIPS_CALL16, R_MIPS_CALL16 },
1022   { BFD_RELOC_GPREL32, R_MIPS_GPREL32 },
1023   { BFD_RELOC_MIPS_GOT_HI16, R_MIPS_GOT_HI16 },
1024   { BFD_RELOC_MIPS_GOT_LO16, R_MIPS_GOT_LO16 },
1025   { BFD_RELOC_MIPS_CALL_HI16, R_MIPS_CALL_HI16 },
1026   { BFD_RELOC_MIPS_CALL_LO16, R_MIPS_CALL_LO16 },
1027   { BFD_RELOC_MIPS_SUB, R_MIPS_SUB },
1028   { BFD_RELOC_MIPS_GOT_PAGE, R_MIPS_GOT_PAGE },
1029   { BFD_RELOC_MIPS_GOT_OFST, R_MIPS_GOT_OFST },
1030   { BFD_RELOC_MIPS_GOT_DISP, R_MIPS_GOT_DISP }
1031 };
1032
1033 /* Given a BFD reloc type, return a howto structure.  */
1034
1035 static reloc_howto_type *
1036 bfd_elf32_bfd_reloc_type_lookup (bfd *abfd, bfd_reloc_code_real_type code)
1037 {
1038   unsigned int i;
1039   reloc_howto_type *howto_table = elf_mips_howto_table_rel;
1040
1041   for (i = 0; i < sizeof (mips_reloc_map) / sizeof (struct elf_reloc_map);
1042        i++)
1043     {
1044       if (mips_reloc_map[i].bfd_val == code)
1045         return &howto_table[(int) mips_reloc_map[i].elf_val];
1046     }
1047
1048   switch (code)
1049     {
1050     default:
1051       bfd_set_error (bfd_error_bad_value);
1052       return NULL;
1053
1054     case BFD_RELOC_CTOR:
1055       /* We need to handle BFD_RELOC_CTOR specially.
1056          Select the right relocation (R_MIPS_32 or R_MIPS_64) based on the
1057          size of addresses of the ABI.  */
1058       if ((elf_elfheader (abfd)->e_flags & (E_MIPS_ABI_O64
1059                                             | E_MIPS_ABI_EABI64)) != 0)
1060         return &elf_mips_ctor64_howto;
1061       else
1062         return &howto_table[(int) R_MIPS_32];
1063
1064     case BFD_RELOC_MIPS16_JMP:
1065       return &elf_mips16_jump_howto;
1066     case BFD_RELOC_MIPS16_GPREL:
1067       return &elf_mips16_gprel_howto;
1068     case BFD_RELOC_VTABLE_INHERIT:
1069       return &elf_mips_gnu_vtinherit_howto;
1070     case BFD_RELOC_VTABLE_ENTRY:
1071       return &elf_mips_gnu_vtentry_howto;
1072     case BFD_RELOC_16_PCREL_S2:
1073       return &elf_mips_gnu_rel16_s2;
1074     }
1075 }
1076
1077 /* Given a MIPS Elf_Internal_Rel, fill in an arelent structure.  */
1078
1079 static reloc_howto_type *
1080 mips_elf32_rtype_to_howto (unsigned int r_type,
1081                            bfd_boolean rela_p ATTRIBUTE_UNUSED)
1082 {
1083   switch (r_type)
1084     {
1085     case R_MIPS16_26:
1086       return &elf_mips16_jump_howto;
1087     case R_MIPS16_GPREL:
1088       return &elf_mips16_gprel_howto;
1089     case R_MIPS_GNU_VTINHERIT:
1090       return &elf_mips_gnu_vtinherit_howto;
1091     case R_MIPS_GNU_VTENTRY:
1092       return &elf_mips_gnu_vtentry_howto;
1093     case R_MIPS_GNU_REL16_S2:
1094       return &elf_mips_gnu_rel16_s2;
1095     default:
1096       BFD_ASSERT (r_type < (unsigned int) R_MIPS_max);
1097       return &elf_mips_howto_table_rel[r_type];
1098     }
1099 }
1100
1101 /* Given a MIPS Elf_Internal_Rel, fill in an arelent structure.  */
1102
1103 static void
1104 mips_info_to_howto_rel (bfd *abfd, arelent *cache_ptr, Elf_Internal_Rela *dst)
1105 {
1106   unsigned int r_type;
1107
1108   r_type = ELF32_R_TYPE (dst->r_info);
1109   cache_ptr->howto = mips_elf32_rtype_to_howto (r_type, FALSE);
1110
1111   /* The addend for a GPREL16 or LITERAL relocation comes from the GP
1112      value for the object file.  We get the addend now, rather than
1113      when we do the relocation, because the symbol manipulations done
1114      by the linker may cause us to lose track of the input BFD.  */
1115   if (((*cache_ptr->sym_ptr_ptr)->flags & BSF_SECTION_SYM) != 0
1116       && (r_type == (unsigned int) R_MIPS_GPREL16
1117           || r_type == (unsigned int) R_MIPS_LITERAL))
1118     cache_ptr->addend = elf_gp (abfd);
1119 }
1120
1121 /* Given a MIPS Elf_Internal_Rela, fill in an arelent structure.  */
1122
1123 static void
1124 mips_info_to_howto_rela (bfd *abfd, arelent *cache_ptr, Elf_Internal_Rela *dst)
1125 {
1126   mips_info_to_howto_rel (abfd, cache_ptr, dst);
1127
1128   /* If we ever need to do any extra processing with dst->r_addend
1129      (the field omitted in an Elf_Internal_Rel) we can do it here.  */
1130 }
1131 \f
1132 /* Determine whether a symbol is global for the purposes of splitting
1133    the symbol table into global symbols and local symbols.  At least
1134    on Irix 5, this split must be between section symbols and all other
1135    symbols.  On most ELF targets the split is between static symbols
1136    and externally visible symbols.  */
1137
1138 static bfd_boolean
1139 mips_elf_sym_is_global (bfd *abfd ATTRIBUTE_UNUSED, asymbol *sym)
1140 {
1141   if (SGI_COMPAT (abfd))
1142     return (sym->flags & BSF_SECTION_SYM) == 0;
1143   else
1144     return ((sym->flags & (BSF_GLOBAL | BSF_WEAK)) != 0
1145             || bfd_is_und_section (bfd_get_section (sym))
1146             || bfd_is_com_section (bfd_get_section (sym)));
1147 }
1148 \f
1149 /* Set the right machine number for a MIPS ELF file.  */
1150
1151 static bfd_boolean
1152 mips_elf32_object_p (bfd *abfd)
1153 {
1154   unsigned long mach;
1155
1156   /* Irix 5 and 6 are broken.  Object file symbol tables are not always
1157      sorted correctly such that local symbols precede global symbols,
1158      and the sh_info field in the symbol table is not always right.  */
1159   if (SGI_COMPAT (abfd))
1160     elf_bad_symtab (abfd) = TRUE;
1161
1162   if (ABI_N32_P (abfd))
1163     return FALSE;
1164
1165   mach = _bfd_elf_mips_mach (elf_elfheader (abfd)->e_flags);
1166   bfd_default_set_arch_mach (abfd, bfd_arch_mips, mach);
1167
1168   return TRUE;
1169 }
1170 \f
1171 /* MIPS ELF local labels start with '$', not 'L'.  */
1172
1173 static bfd_boolean
1174 mips_elf_is_local_label_name (bfd *abfd, const char *name)
1175 {
1176   if (name[0] == '$')
1177     return TRUE;
1178
1179   /* On Irix 6, the labels go back to starting with '.', so we accept
1180      the generic ELF local label syntax as well.  */
1181   return _bfd_elf_is_local_label_name (abfd, name);
1182 }
1183 \f
1184 /* Support for core dump NOTE sections.  */
1185 static bfd_boolean
1186 elf32_mips_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
1187 {
1188   int offset;
1189   unsigned int raw_size;
1190
1191   switch (note->descsz)
1192     {
1193       default:
1194         return FALSE;
1195
1196       case 256:         /* Linux/MIPS */
1197         /* pr_cursig */
1198         elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12);
1199
1200         /* pr_pid */
1201         elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24);
1202
1203         /* pr_reg */
1204         offset = 72;
1205         raw_size = 180;
1206
1207         break;
1208     }
1209
1210   /* Make a ".reg/999" section.  */
1211   return _bfd_elfcore_make_pseudosection (abfd, ".reg",
1212                                           raw_size, note->descpos + offset);
1213 }
1214
1215 static bfd_boolean
1216 elf32_mips_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
1217 {
1218   switch (note->descsz)
1219     {
1220       default:
1221         return FALSE;
1222
1223       case 128:         /* Linux/MIPS elf_prpsinfo */
1224         elf_tdata (abfd)->core_program
1225          = _bfd_elfcore_strndup (abfd, note->descdata + 32, 16);
1226         elf_tdata (abfd)->core_command
1227          = _bfd_elfcore_strndup (abfd, note->descdata + 48, 80);
1228     }
1229
1230   /* Note that for some reason, a spurious space is tacked
1231      onto the end of the args in some (at least one anyway)
1232      implementations, so strip it off if it exists.  */
1233
1234   {
1235     char *command = elf_tdata (abfd)->core_command;
1236     int n = strlen (command);
1237
1238     if (0 < n && command[n - 1] == ' ')
1239       command[n - 1] = '\0';
1240   }
1241
1242   return TRUE;
1243 }
1244 \f
1245 /* Depending on the target vector we generate some version of Irix
1246    executables or "normal" MIPS ELF ABI executables.  */
1247 static irix_compat_t
1248 elf32_mips_irix_compat (bfd *abfd)
1249 {
1250   if ((abfd->xvec == &bfd_elf32_bigmips_vec)
1251       || (abfd->xvec == &bfd_elf32_littlemips_vec))
1252     return ict_irix5;
1253   else
1254     return ict_none;
1255 }
1256 \f
1257 /* ECOFF swapping routines.  These are used when dealing with the
1258    .mdebug section, which is in the ECOFF debugging format.  */
1259 static const struct ecoff_debug_swap mips_elf32_ecoff_debug_swap = {
1260   /* Symbol table magic number.  */
1261   magicSym,
1262   /* Alignment of debugging information.  E.g., 4.  */
1263   4,
1264   /* Sizes of external symbolic information.  */
1265   sizeof (struct hdr_ext),
1266   sizeof (struct dnr_ext),
1267   sizeof (struct pdr_ext),
1268   sizeof (struct sym_ext),
1269   sizeof (struct opt_ext),
1270   sizeof (struct fdr_ext),
1271   sizeof (struct rfd_ext),
1272   sizeof (struct ext_ext),
1273   /* Functions to swap in external symbolic data.  */
1274   ecoff_swap_hdr_in,
1275   ecoff_swap_dnr_in,
1276   ecoff_swap_pdr_in,
1277   ecoff_swap_sym_in,
1278   ecoff_swap_opt_in,
1279   ecoff_swap_fdr_in,
1280   ecoff_swap_rfd_in,
1281   ecoff_swap_ext_in,
1282   _bfd_ecoff_swap_tir_in,
1283   _bfd_ecoff_swap_rndx_in,
1284   /* Functions to swap out external symbolic data.  */
1285   ecoff_swap_hdr_out,
1286   ecoff_swap_dnr_out,
1287   ecoff_swap_pdr_out,
1288   ecoff_swap_sym_out,
1289   ecoff_swap_opt_out,
1290   ecoff_swap_fdr_out,
1291   ecoff_swap_rfd_out,
1292   ecoff_swap_ext_out,
1293   _bfd_ecoff_swap_tir_out,
1294   _bfd_ecoff_swap_rndx_out,
1295   /* Function to read in symbolic data.  */
1296   _bfd_mips_elf_read_ecoff_info
1297 };
1298 \f
1299 #define ELF_ARCH                        bfd_arch_mips
1300 #define ELF_MACHINE_CODE                EM_MIPS
1301
1302 #define elf_backend_collect             TRUE
1303 #define elf_backend_type_change_ok      TRUE
1304 #define elf_backend_can_gc_sections     TRUE
1305 #define elf_info_to_howto               mips_info_to_howto_rela
1306 #define elf_info_to_howto_rel           mips_info_to_howto_rel
1307 #define elf_backend_sym_is_global       mips_elf_sym_is_global
1308 #define elf_backend_object_p            mips_elf32_object_p
1309 #define elf_backend_symbol_processing   _bfd_mips_elf_symbol_processing
1310 #define elf_backend_section_processing  _bfd_mips_elf_section_processing
1311 #define elf_backend_section_from_shdr   _bfd_mips_elf_section_from_shdr
1312 #define elf_backend_fake_sections       _bfd_mips_elf_fake_sections
1313 #define elf_backend_section_from_bfd_section \
1314                                         _bfd_mips_elf_section_from_bfd_section
1315 #define elf_backend_add_symbol_hook     _bfd_mips_elf_add_symbol_hook
1316 #define elf_backend_link_output_symbol_hook \
1317                                         _bfd_mips_elf_link_output_symbol_hook
1318 #define elf_backend_create_dynamic_sections \
1319                                         _bfd_mips_elf_create_dynamic_sections
1320 #define elf_backend_check_relocs        _bfd_mips_elf_check_relocs
1321 #define elf_backend_adjust_dynamic_symbol \
1322                                         _bfd_mips_elf_adjust_dynamic_symbol
1323 #define elf_backend_always_size_sections \
1324                                         _bfd_mips_elf_always_size_sections
1325 #define elf_backend_size_dynamic_sections \
1326                                         _bfd_mips_elf_size_dynamic_sections
1327 #define elf_backend_relocate_section    _bfd_mips_elf_relocate_section
1328 #define elf_backend_finish_dynamic_symbol \
1329                                         _bfd_mips_elf_finish_dynamic_symbol
1330 #define elf_backend_finish_dynamic_sections \
1331                                         _bfd_mips_elf_finish_dynamic_sections
1332 #define elf_backend_final_write_processing \
1333                                         _bfd_mips_elf_final_write_processing
1334 #define elf_backend_additional_program_headers \
1335                                         _bfd_mips_elf_additional_program_headers
1336 #define elf_backend_modify_segment_map  _bfd_mips_elf_modify_segment_map
1337 #define elf_backend_gc_mark_hook        _bfd_mips_elf_gc_mark_hook
1338 #define elf_backend_gc_sweep_hook       _bfd_mips_elf_gc_sweep_hook
1339 #define elf_backend_copy_indirect_symbol \
1340                                         _bfd_mips_elf_copy_indirect_symbol
1341 #define elf_backend_hide_symbol         _bfd_mips_elf_hide_symbol
1342 #define elf_backend_grok_prstatus       elf32_mips_grok_prstatus
1343 #define elf_backend_grok_psinfo         elf32_mips_grok_psinfo
1344 #define elf_backend_ecoff_debug_swap    &mips_elf32_ecoff_debug_swap
1345
1346 #define elf_backend_got_header_size     (4 * MIPS_RESERVED_GOTNO)
1347 #define elf_backend_may_use_rel_p       1
1348 #define elf_backend_may_use_rela_p      0
1349 #define elf_backend_default_use_rela_p  0
1350 #define elf_backend_sign_extend_vma     TRUE
1351
1352 #define elf_backend_discard_info        _bfd_mips_elf_discard_info
1353 #define elf_backend_ignore_discarded_relocs \
1354                                         _bfd_mips_elf_ignore_discarded_relocs
1355 #define elf_backend_mips_irix_compat    elf32_mips_irix_compat
1356 #define elf_backend_mips_rtype_to_howto mips_elf32_rtype_to_howto
1357 #define bfd_elf32_bfd_is_local_label_name \
1358                                         mips_elf_is_local_label_name
1359 #define bfd_elf32_find_nearest_line     _bfd_mips_elf_find_nearest_line
1360 #define bfd_elf32_new_section_hook      _bfd_mips_elf_new_section_hook
1361 #define bfd_elf32_set_section_contents  _bfd_mips_elf_set_section_contents
1362 #define bfd_elf32_bfd_get_relocated_section_contents \
1363                                 _bfd_elf_mips_get_relocated_section_contents
1364 #define bfd_elf32_bfd_link_hash_table_create \
1365                                         _bfd_mips_elf_link_hash_table_create
1366 #define bfd_elf32_bfd_final_link        _bfd_mips_elf_final_link
1367 #define bfd_elf32_bfd_merge_private_bfd_data \
1368                                         _bfd_mips_elf_merge_private_bfd_data
1369 #define bfd_elf32_bfd_set_private_flags _bfd_mips_elf_set_private_flags
1370 #define bfd_elf32_bfd_print_private_bfd_data \
1371                                         _bfd_mips_elf_print_private_bfd_data
1372
1373 /* Support for SGI-ish mips targets.  */
1374 #define TARGET_LITTLE_SYM               bfd_elf32_littlemips_vec
1375 #define TARGET_LITTLE_NAME              "elf32-littlemips"
1376 #define TARGET_BIG_SYM                  bfd_elf32_bigmips_vec
1377 #define TARGET_BIG_NAME                 "elf32-bigmips"
1378
1379 /* The SVR4 MIPS ABI says that this should be 0x10000, but Irix 5 uses
1380    a value of 0x1000, and we are compatible.  */
1381 #define ELF_MAXPAGESIZE                 0x1000
1382
1383 #include "elf32-target.h"
1384
1385 /* Support for traditional mips targets.  */
1386 #undef TARGET_LITTLE_SYM
1387 #undef TARGET_LITTLE_NAME
1388 #undef TARGET_BIG_SYM
1389 #undef TARGET_BIG_NAME
1390
1391 #undef ELF_MAXPAGESIZE
1392
1393 #define TARGET_LITTLE_SYM               bfd_elf32_tradlittlemips_vec
1394 #define TARGET_LITTLE_NAME              "elf32-tradlittlemips"
1395 #define TARGET_BIG_SYM                  bfd_elf32_tradbigmips_vec
1396 #define TARGET_BIG_NAME                 "elf32-tradbigmips"
1397
1398 /* The SVR4 MIPS ABI says that this should be 0x10000, and Linux uses
1399    page sizes of up to that limit, so we need to respect it.  */
1400 #define ELF_MAXPAGESIZE                 0x10000
1401 #define elf32_bed                       elf32_tradbed
1402
1403 /* Include the target file again for this target.  */
1404 #include "elf32-target.h"