bfd/coff-mips.c

   1 /* BFD back-end for MIPS Extended-Coff files.
   2    Copyright 1990, 91, 92, 93, 94, 95, 96, 97, 1998
   3    Free Software Foundation, Inc.
   4    Original version by Per Bothner.
   5    Full support added by Ian Lance Taylor, ian@cygnus.com.
   6
   7 This file is part of BFD, the Binary File Descriptor library.
   8
   9 This program is free software; you can redistribute it and/or modify
  10 it under the terms of the GNU General Public License as published by
  11 the Free Software Foundation; either version 2 of the License, or
  12 (at your option) any later version.
  13
  14 This program is distributed in the hope that it will be useful,
  15 but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 GNU General Public License for more details.
  18
  19 You should have received a copy of the GNU General Public License
  20 along with this program; if not, write to the Free Software
  21 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  22
  23 #include "bfd.h"
  24 #include "sysdep.h"
  25 #include "bfdlink.h"
  26 #include "libbfd.h"
  27 #include "coff/internal.h"
  28 #include "coff/sym.h"
  29 #include "coff/symconst.h"
  30 #include "coff/ecoff.h"
  31 #include "coff/mips.h"
  32 #include "libcoff.h"
  33 #include "libecoff.h"
  34 \f
  35 /* Prototypes for static functions.  */
  36
  37 static boolean mips_ecoff_bad_format_hook PARAMS ((bfd *abfd, PTR filehdr));
  38 static void mips_ecoff_swap_reloc_in PARAMS ((bfd *, PTR,
  39                                               struct internal_reloc *));
  40 static void mips_ecoff_swap_reloc_out PARAMS ((bfd *,
  41                                                const struct internal_reloc *,
  42                                                PTR));
  43 static void mips_adjust_reloc_in PARAMS ((bfd *,
  44                                           const struct internal_reloc *,
  45                                           arelent *));
  46 static void mips_adjust_reloc_out PARAMS ((bfd *, const arelent *,
  47                                            struct internal_reloc *));
  48 static bfd_reloc_status_type mips_generic_reloc PARAMS ((bfd *abfd,
  49                                                          arelent *reloc,
  50                                                          asymbol *symbol,
  51                                                          PTR data,
  52                                                          asection *section,
  53                                                          bfd *output_bfd,
  54                                                          char **error));
  55 static bfd_reloc_status_type mips_refhi_reloc PARAMS ((bfd *abfd,
  56                                                        arelent *reloc,
  57                                                        asymbol *symbol,
  58                                                        PTR data,
  59                                                        asection *section,
  60                                                        bfd *output_bfd,
  61                                                        char **error));
  62 static bfd_reloc_status_type mips_reflo_reloc PARAMS ((bfd *abfd,
  63                                                        arelent *reloc,
  64                                                        asymbol *symbol,
  65                                                        PTR data,
  66                                                        asection *section,
  67                                                        bfd *output_bfd,
  68                                                        char **error));
  69 static bfd_reloc_status_type mips_gprel_reloc PARAMS ((bfd *abfd,
  70                                                        arelent *reloc,
  71                                                        asymbol *symbol,
  72                                                        PTR data,
  73                                                        asection *section,
  74                                                        bfd *output_bfd,
  75                                                        char **error));
  76 static bfd_reloc_status_type mips_relhi_reloc PARAMS ((bfd *abfd,
  77                                                        arelent *reloc,
  78                                                        asymbol *symbol,
  79                                                        PTR data,
  80                                                        asection *section,
  81                                                        bfd *output_bfd,
  82                                                        char **error));
  83 static bfd_reloc_status_type mips_rello_reloc PARAMS ((bfd *abfd,
  84                                                        arelent *reloc,
  85                                                        asymbol *symbol,
  86                                                        PTR data,
  87                                                        asection *section,
  88                                                        bfd *output_bfd,
  89                                                        char **error));
  90 static bfd_reloc_status_type mips_switch_reloc PARAMS ((bfd *abfd,
  91                                                         arelent *reloc,
  92                                                         asymbol *symbol,
  93                                                         PTR data,
  94                                                         asection *section,
  95                                                         bfd *output_bfd,
  96                                                         char **error));
  97 static void mips_relocate_hi PARAMS ((struct internal_reloc *refhi,
  98                                       struct internal_reloc *reflo,
  99                                       bfd *input_bfd,
 100                                       asection *input_section,
 101                                       bfd_byte *contents,
 102                                       size_t adjust,
 103                                       bfd_vma relocation,
 104                                       boolean pcrel));
 105 static boolean mips_relocate_section PARAMS ((bfd *, struct bfd_link_info *,
 106                                               bfd *, asection *,
 107                                               bfd_byte *, PTR));
 108 static boolean mips_read_relocs PARAMS ((bfd *, asection *));
 109 static boolean mips_relax_section PARAMS ((bfd *, asection *,
 110                                            struct bfd_link_info *,
 111                                            boolean *));
 112 static boolean mips_relax_pcrel16 PARAMS ((struct bfd_link_info *, bfd *,
 113                                            asection *,
 114                                            struct ecoff_link_hash_entry *,
 115                                            bfd_byte *, bfd_vma));
 116 static reloc_howto_type *mips_bfd_reloc_type_lookup
 117   PARAMS ((bfd *, bfd_reloc_code_real_type));
 118
 119 \f
 120 /* ECOFF has COFF sections, but the debugging information is stored in
 121    a completely different format.  ECOFF targets use some of the
 122    swapping routines from coffswap.h, and some of the generic COFF
 123    routines in coffgen.c, but, unlike the real COFF targets, do not
 124    use coffcode.h itself.
 125
 126    Get the generic COFF swapping routines, except for the reloc,
 127    symbol, and lineno ones.  Give them ECOFF names.  */
 128 #define MIPSECOFF
 129 #define NO_COFF_RELOCS
 130 #define NO_COFF_SYMBOLS
 131 #define NO_COFF_LINENOS
 132 #define coff_swap_filehdr_in mips_ecoff_swap_filehdr_in
 133 #define coff_swap_filehdr_out mips_ecoff_swap_filehdr_out
 134 #define coff_swap_aouthdr_in mips_ecoff_swap_aouthdr_in
 135 #define coff_swap_aouthdr_out mips_ecoff_swap_aouthdr_out
 136 #define coff_swap_scnhdr_in mips_ecoff_swap_scnhdr_in
 137 #define coff_swap_scnhdr_out mips_ecoff_swap_scnhdr_out
 138 #include "coffswap.h"
 139
 140 /* Get the ECOFF swapping routines.  */
 141 #define ECOFF_32
 142 #include "ecoffswap.h"
 143 \f
 144 /* How to process the various relocs types.  */
 145
 146 static reloc_howto_type mips_howto_table[] =
 147 {
 148   /* Reloc type 0 is ignored.  The reloc reading code ensures that
 149      this is a reference to the .abs section, which will cause
 150      bfd_perform_relocation to do nothing.  */
 151   HOWTO (MIPS_R_IGNORE, /* type */
 152          0,                     /* rightshift */
 153          0,                     /* size (0 = byte, 1 = short, 2 = long) */
 154          8,                     /* bitsize */
 155          false,                 /* pc_relative */
 156          0,                     /* bitpos */
 157          complain_overflow_dont, /* complain_on_overflow */
 158          0,                     /* special_function */
 159          "IGNORE",              /* name */
 160          false,                 /* partial_inplace */
 161          0,                     /* src_mask */
 162          0,                     /* dst_mask */
 163          false),                /* pcrel_offset */
 164
 165   /* A 16 bit reference to a symbol, normally from a data section.  */
 166   HOWTO (MIPS_R_REFHALF,        /* type */
 167          0,                     /* rightshift */
 168          1,                     /* size (0 = byte, 1 = short, 2 = long) */
 169          16,                    /* bitsize */
 170          false,                 /* pc_relative */
 171          0,                     /* bitpos */
 172          complain_overflow_bitfield, /* complain_on_overflow */
 173          mips_generic_reloc,    /* special_function */
 174          "REFHALF",             /* name */
 175          true,                  /* partial_inplace */
 176          0xffff,                /* src_mask */
 177          0xffff,                /* dst_mask */
 178          false),                /* pcrel_offset */
 179
 180   /* A 32 bit reference to a symbol, normally from a data section.  */
 181   HOWTO (MIPS_R_REFWORD,        /* type */
 182          0,                     /* rightshift */
 183          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 184          32,                    /* bitsize */
 185          false,                 /* pc_relative */
 186          0,                     /* bitpos */
 187          complain_overflow_bitfield, /* complain_on_overflow */
 188          mips_generic_reloc,    /* special_function */
 189          "REFWORD",             /* name */
 190          true,                  /* partial_inplace */
 191          0xffffffff,            /* src_mask */
 192          0xffffffff,            /* dst_mask */
 193          false),                /* pcrel_offset */
 194
 195   /* A 26 bit absolute jump address.  */
 196   HOWTO (MIPS_R_JMPADDR,        /* type */
 197          2,                     /* rightshift */
 198          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 199          26,                    /* bitsize */
 200          false,                 /* pc_relative */
 201          0,                     /* bitpos */
 202          complain_overflow_dont, /* complain_on_overflow */
 203                                 /* This needs complex overflow
 204                                    detection, because the upper four
 205                                    bits must match the PC.  */
 206          mips_generic_reloc,    /* special_function */
 207          "JMPADDR",             /* name */
 208          true,                  /* partial_inplace */
 209          0x3ffffff,             /* src_mask */
 210          0x3ffffff,             /* dst_mask */
 211          false),                /* pcrel_offset */
 212
 213   /* The high 16 bits of a symbol value.  Handled by the function
 214      mips_refhi_reloc.  */
 215   HOWTO (MIPS_R_REFHI,          /* type */
 216          16,                    /* rightshift */
 217          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 218          16,                    /* bitsize */
 219          false,                 /* pc_relative */
 220          0,                     /* bitpos */
 221          complain_overflow_bitfield, /* complain_on_overflow */
 222          mips_refhi_reloc,      /* special_function */
 223          "REFHI",               /* name */
 224          true,                  /* partial_inplace */
 225          0xffff,                /* src_mask */
 226          0xffff,                /* dst_mask */
 227          false),                /* pcrel_offset */
 228
 229   /* The low 16 bits of a symbol value.  */
 230   HOWTO (MIPS_R_REFLO,          /* type */
 231          0,                     /* rightshift */
 232          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 233          16,                    /* bitsize */
 234          false,                 /* pc_relative */
 235          0,                     /* bitpos */
 236          complain_overflow_dont, /* complain_on_overflow */
 237          mips_reflo_reloc,      /* special_function */
 238          "REFLO",               /* name */
 239          true,                  /* partial_inplace */
 240          0xffff,                /* src_mask */
 241          0xffff,                /* dst_mask */
 242          false),                /* pcrel_offset */
 243
 244   /* A reference to an offset from the gp register.  Handled by the
 245      function mips_gprel_reloc.  */
 246   HOWTO (MIPS_R_GPREL,          /* 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          mips_gprel_reloc,      /* special_function */
 254          "GPREL",               /* name */
 255          true,                  /* partial_inplace */
 256          0xffff,                /* src_mask */
 257          0xffff,                /* dst_mask */
 258          false),                /* pcrel_offset */
 259
 260   /* A reference to a literal using an offset from the gp register.
 261      Handled by the function mips_gprel_reloc.  */
 262   HOWTO (MIPS_R_LITERAL,        /* type */
 263          0,                     /* rightshift */
 264          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 265          16,                    /* bitsize */
 266          false,                 /* pc_relative */
 267          0,                     /* bitpos */
 268          complain_overflow_signed, /* complain_on_overflow */
 269          mips_gprel_reloc,      /* special_function */
 270          "LITERAL",             /* name */
 271          true,                  /* partial_inplace */
 272          0xffff,                /* src_mask */
 273          0xffff,                /* dst_mask */
 274          false),                /* pcrel_offset */
 275
 276   { 8 },
 277   { 9 },
 278   { 10 },
 279   { 11 },
 280
 281   /* This reloc is a Cygnus extension used when generating position
 282      independent code for embedded systems.  It represents a 16 bit PC
 283      relative reloc rightshifted twice as used in the MIPS branch
 284      instructions.  */
 285   HOWTO (MIPS_R_PCREL16,        /* type */
 286          2,                     /* rightshift */
 287          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 288          16,                    /* bitsize */
 289          true,                  /* pc_relative */
 290          0,                     /* bitpos */
 291          complain_overflow_signed, /* complain_on_overflow */
 292          mips_generic_reloc,    /* special_function */
 293          "PCREL16",             /* name */
 294          true,                  /* partial_inplace */
 295          0xffff,                /* src_mask */
 296          0xffff,                /* dst_mask */
 297          true),                 /* pcrel_offset */
 298
 299   /* This reloc is a Cygnus extension used when generating position
 300      independent code for embedded systems.  It represents the high 16
 301      bits of a PC relative reloc.  The next reloc must be
 302      MIPS_R_RELLO, and the addend is formed from the addends of the
 303      two instructions, just as in MIPS_R_REFHI and MIPS_R_REFLO.  The
 304      final value is actually PC relative to the location of the
 305      MIPS_R_RELLO reloc, not the MIPS_R_RELHI reloc.  */
 306   HOWTO (MIPS_R_RELHI,          /* type */
 307          16,                    /* rightshift */
 308          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 309          16,                    /* bitsize */
 310          true,                  /* pc_relative */
 311          0,                     /* bitpos */
 312          complain_overflow_bitfield, /* complain_on_overflow */
 313          mips_relhi_reloc,      /* special_function */
 314          "RELHI",               /* name */
 315          true,                  /* partial_inplace */
 316          0xffff,                /* src_mask */
 317          0xffff,                /* dst_mask */
 318          true),                 /* pcrel_offset */
 319
 320   /* This reloc is a Cygnus extension used when generating position
 321      independent code for embedded systems.  It represents the low 16
 322      bits of a PC relative reloc.  */
 323   HOWTO (MIPS_R_RELLO,          /* type */
 324          0,                     /* rightshift */
 325          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 326          16,                    /* bitsize */
 327          true,                  /* pc_relative */
 328          0,                     /* bitpos */
 329          complain_overflow_dont, /* complain_on_overflow */
 330          mips_rello_reloc,      /* special_function */
 331          "RELLO",               /* name */
 332          true,                  /* partial_inplace */
 333          0xffff,                /* src_mask */
 334          0xffff,                /* dst_mask */
 335          true),                 /* pcrel_offset */
 336
 337   { 15 },
 338   { 16 },
 339   { 17 },
 340   { 18 },
 341   { 19 },
 342   { 20 },
 343   { 21 },
 344
 345   /* This reloc is a Cygnus extension used when generating position
 346      independent code for embedded systems.  It represents an entry in
 347      a switch table, which is the difference between two symbols in
 348      the .text section.  The symndx is actually the offset from the
 349      reloc address to the subtrahend.  See include/coff/mips.h for
 350      more details.  */
 351   HOWTO (MIPS_R_SWITCH,         /* type */
 352          0,                     /* rightshift */
 353          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 354          32,                    /* bitsize */
 355          true,                  /* pc_relative */
 356          0,                     /* bitpos */
 357          complain_overflow_dont, /* complain_on_overflow */
 358          mips_switch_reloc,     /* special_function */
 359          "SWITCH",              /* name */
 360          true,                  /* partial_inplace */
 361          0xffffffff,            /* src_mask */
 362          0xffffffff,            /* dst_mask */
 363          true)                  /* pcrel_offset */
 364 };
 365
 366 #define MIPS_HOWTO_COUNT \
 367   (sizeof mips_howto_table / sizeof mips_howto_table[0])
 368
 369 /* When the linker is doing relaxing, it may change a external PCREL16
 370    reloc.  This typically represents an instruction like
 371        bal foo
 372    We change it to
 373        .set  noreorder
 374        bal   $L1
 375        lui   $at,%hi(foo - $L1)
 376      $L1:
 377        addiu $at,%lo(foo - $L1)
 378        addu  $at,$at,$31
 379        jalr  $at
 380    PCREL16_EXPANSION_ADJUSTMENT is the number of bytes this changes the
 381    instruction by.  */
 382
 383 #define PCREL16_EXPANSION_ADJUSTMENT (4 * 4)
 384 \f
 385 /* See whether the magic number matches.  */
 386
 387 static boolean
 388 mips_ecoff_bad_format_hook (abfd, filehdr)
 389      bfd *abfd;
 390      PTR filehdr;
 391 {
 392   struct internal_filehdr *internal_f = (struct internal_filehdr *) filehdr;
 393
 394   switch (internal_f->f_magic)
 395     {
 396     case MIPS_MAGIC_1:
 397       /* I don't know what endianness this implies.  */
 398       return true;
 399
 400     case MIPS_MAGIC_BIG:
 401     case MIPS_MAGIC_BIG2:
 402     case MIPS_MAGIC_BIG3:
 403       return bfd_big_endian (abfd);
 404
 405     case MIPS_MAGIC_LITTLE:
 406     case MIPS_MAGIC_LITTLE2:
 407     case MIPS_MAGIC_LITTLE3:
 408       return bfd_little_endian (abfd);
 409
 410     default:
 411       return false;
 412     }
 413 }
 414 \f
 415 /* Reloc handling.  MIPS ECOFF relocs are packed into 8 bytes in
 416    external form.  They use a bit which indicates whether the symbol
 417    is external.  */
 418
 419 /* Swap a reloc in.  */
 420
 421 static void
 422 mips_ecoff_swap_reloc_in (abfd, ext_ptr, intern)
 423      bfd *abfd;
 424      PTR ext_ptr;
 425      struct internal_reloc *intern;
 426 {
 427   const RELOC *ext = (RELOC *) ext_ptr;
 428
 429   intern->r_vaddr = bfd_h_get_32 (abfd, (bfd_byte *) ext->r_vaddr);
 430   if (bfd_header_big_endian (abfd))
 431     {
 432       intern->r_symndx = (((int) ext->r_bits[0]
 433                            << RELOC_BITS0_SYMNDX_SH_LEFT_BIG)
 434                           | ((int) ext->r_bits[1]
 435                              << RELOC_BITS1_SYMNDX_SH_LEFT_BIG)
 436                           | ((int) ext->r_bits[2]
 437                              << RELOC_BITS2_SYMNDX_SH_LEFT_BIG));
 438       intern->r_type = ((ext->r_bits[3] & RELOC_BITS3_TYPE_BIG)
 439                         >> RELOC_BITS3_TYPE_SH_BIG);
 440       intern->r_extern = (ext->r_bits[3] & RELOC_BITS3_EXTERN_BIG) != 0;
 441     }
 442   else
 443     {
 444       intern->r_symndx = (((int) ext->r_bits[0]
 445                            << RELOC_BITS0_SYMNDX_SH_LEFT_LITTLE)
 446                           | ((int) ext->r_bits[1]
 447                              << RELOC_BITS1_SYMNDX_SH_LEFT_LITTLE)
 448                           | ((int) ext->r_bits[2]
 449                              << RELOC_BITS2_SYMNDX_SH_LEFT_LITTLE));
 450       intern->r_type = (((ext->r_bits[3] & RELOC_BITS3_TYPE_LITTLE)
 451                          >> RELOC_BITS3_TYPE_SH_LITTLE)
 452                         | ((ext->r_bits[3] & RELOC_BITS3_TYPEHI_LITTLE)
 453                            << RELOC_BITS3_TYPEHI_SH_LITTLE));
 454       intern->r_extern = (ext->r_bits[3] & RELOC_BITS3_EXTERN_LITTLE) != 0;
 455     }
 456
 457   /* If this is a MIPS_R_SWITCH reloc, or an internal MIPS_R_RELHI or
 458      MIPS_R_RELLO reloc, r_symndx is actually the offset from the
 459      reloc address to the base of the difference (see
 460      include/coff/mips.h for more details).  We copy symndx into the
 461      r_offset field so as not to confuse ecoff_slurp_reloc_table in
 462      ecoff.c.  In adjust_reloc_in we then copy r_offset into the reloc
 463      addend.  */
 464   if (intern->r_type == MIPS_R_SWITCH
 465       || (! intern->r_extern
 466           && (intern->r_type == MIPS_R_RELLO
 467               || intern->r_type == MIPS_R_RELHI)))
 468     {
 469       BFD_ASSERT (! intern->r_extern);
 470       intern->r_offset = intern->r_symndx;
 471       if (intern->r_offset & 0x800000)
 472         intern->r_offset -= 0x1000000;
 473       intern->r_symndx = RELOC_SECTION_TEXT;
 474     }
 475 }
 476
 477 /* Swap a reloc out.  */
 478
 479 static void
 480 mips_ecoff_swap_reloc_out (abfd, intern, dst)
 481      bfd *abfd;
 482      const struct internal_reloc *intern;
 483      PTR dst;
 484 {
 485   RELOC *ext = (RELOC *) dst;
 486   long r_symndx;
 487
 488   BFD_ASSERT (intern->r_extern
 489               || (intern->r_symndx >= 0 && intern->r_symndx <= 12));
 490
 491   /* If this is a MIPS_R_SWITCH reloc, or an internal MIPS_R_RELLO or
 492      MIPS_R_RELHI reloc, we actually want to write the contents of
 493      r_offset out as the symbol index.  This undoes the change made by
 494      mips_ecoff_swap_reloc_in.  */
 495   if (intern->r_type != MIPS_R_SWITCH
 496       && (intern->r_extern
 497           || (intern->r_type != MIPS_R_RELHI
 498               && intern->r_type != MIPS_R_RELLO)))
 499     r_symndx = intern->r_symndx;
 500   else
 501     {
 502       BFD_ASSERT (intern->r_symndx == RELOC_SECTION_TEXT);
 503       r_symndx = intern->r_offset & 0xffffff;
 504     }
 505
 506   bfd_h_put_32 (abfd, intern->r_vaddr, (bfd_byte *) ext->r_vaddr);
 507   if (bfd_header_big_endian (abfd))
 508     {
 509       ext->r_bits[0] = r_symndx >> RELOC_BITS0_SYMNDX_SH_LEFT_BIG;
 510       ext->r_bits[1] = r_symndx >> RELOC_BITS1_SYMNDX_SH_LEFT_BIG;
 511       ext->r_bits[2] = r_symndx >> RELOC_BITS2_SYMNDX_SH_LEFT_BIG;
 512       ext->r_bits[3] = (((intern->r_type << RELOC_BITS3_TYPE_SH_BIG)
 513                          & RELOC_BITS3_TYPE_BIG)
 514                         | (intern->r_extern ? RELOC_BITS3_EXTERN_BIG : 0));
 515     }
 516   else
 517     {
 518       ext->r_bits[0] = r_symndx >> RELOC_BITS0_SYMNDX_SH_LEFT_LITTLE;
 519       ext->r_bits[1] = r_symndx >> RELOC_BITS1_SYMNDX_SH_LEFT_LITTLE;
 520       ext->r_bits[2] = r_symndx >> RELOC_BITS2_SYMNDX_SH_LEFT_LITTLE;
 521       ext->r_bits[3] = (((intern->r_type << RELOC_BITS3_TYPE_SH_LITTLE)
 522                          & RELOC_BITS3_TYPE_LITTLE)
 523                         | ((intern->r_type >> RELOC_BITS3_TYPEHI_SH_LITTLE
 524                             & RELOC_BITS3_TYPEHI_LITTLE))
 525                         | (intern->r_extern ? RELOC_BITS3_EXTERN_LITTLE : 0));
 526     }
 527 }
 528
 529 /* Finish canonicalizing a reloc.  Part of this is generic to all
 530    ECOFF targets, and that part is in ecoff.c.  The rest is done in
 531    this backend routine.  It must fill in the howto field.  */
 532
 533 static void
 534 mips_adjust_reloc_in (abfd, intern, rptr)
 535      bfd *abfd;
 536      const struct internal_reloc *intern;
 537      arelent *rptr;
 538 {
 539   if (intern->r_type > MIPS_R_SWITCH)
 540     abort ();
 541
 542   if (! intern->r_extern
 543       && (intern->r_type == MIPS_R_GPREL
 544           || intern->r_type == MIPS_R_LITERAL))
 545     rptr->addend += ecoff_data (abfd)->gp;
 546
 547   /* If the type is MIPS_R_IGNORE, make sure this is a reference to
 548      the absolute section so that the reloc is ignored.  */
 549   if (intern->r_type == MIPS_R_IGNORE)
 550     rptr->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr;
 551
 552   /* If this is a MIPS_R_SWITCH reloc, or an internal MIPS_R_RELHI or
 553      MIPS_R_RELLO reloc, we want the addend field of the BFD relocto
 554      hold the value which was originally in the symndx field of the
 555      internal MIPS ECOFF reloc.  This value was copied into
 556      intern->r_offset by mips_swap_reloc_in, and here we copy it into
 557      the addend field.  */
 558   if (intern->r_type == MIPS_R_SWITCH
 559       || (! intern->r_extern
 560           && (intern->r_type == MIPS_R_RELHI
 561               || intern->r_type == MIPS_R_RELLO)))
 562     rptr->addend = intern->r_offset;
 563
 564   rptr->howto = &mips_howto_table[intern->r_type];
 565 }
 566
 567 /* Make any adjustments needed to a reloc before writing it out.  None
 568    are needed for MIPS.  */
 569
 570 static void
 571 mips_adjust_reloc_out (abfd, rel, intern)
 572      bfd *abfd;
 573      const arelent *rel;
 574      struct internal_reloc *intern;
 575 {
 576   /* For a MIPS_R_SWITCH reloc, or an internal MIPS_R_RELHI or
 577      MIPS_R_RELLO reloc, we must copy rel->addend into
 578      intern->r_offset.  This will then be written out as the symbol
 579      index by mips_ecoff_swap_reloc_out.  This operation parallels the
 580      action of mips_adjust_reloc_in.  */
 581   if (intern->r_type == MIPS_R_SWITCH
 582       || (! intern->r_extern
 583           && (intern->r_type == MIPS_R_RELHI
 584               || intern->r_type == MIPS_R_RELLO)))
 585     intern->r_offset = rel->addend;
 586 }
 587
 588 /* ECOFF relocs are either against external symbols, or against
 589    sections.  If we are producing relocateable output, and the reloc
 590    is against an external symbol, and nothing has given us any
 591    additional addend, the resulting reloc will also be against the
 592    same symbol.  In such a case, we don't want to change anything
 593    about the way the reloc is handled, since it will all be done at
 594    final link time.  Rather than put special case code into
 595    bfd_perform_relocation, all the reloc types use this howto
 596    function.  It just short circuits the reloc if producing
 597    relocateable output against an external symbol.  */
 598
 599 static bfd_reloc_status_type
 600 mips_generic_reloc (abfd,
 601                     reloc_entry,
 602                     symbol,
 603                     data,
 604                     input_section,
 605                     output_bfd,
 606                     error_message)
 607      bfd *abfd;
 608      arelent *reloc_entry;
 609      asymbol *symbol;
 610      PTR data;
 611      asection *input_section;
 612      bfd *output_bfd;
 613      char **error_message;
 614 {
 615   if (output_bfd != (bfd *) NULL
 616       && (symbol->flags & BSF_SECTION_SYM) == 0
 617       && reloc_entry->addend == 0)
 618     {
 619       reloc_entry->address += input_section->output_offset;
 620       return bfd_reloc_ok;
 621     }
 622
 623   return bfd_reloc_continue;
 624 }
 625
 626 /* Do a REFHI relocation.  This has to be done in combination with a
 627    REFLO reloc, because there is a carry from the REFLO to the REFHI.
 628    Here we just save the information we need; we do the actual
 629    relocation when we see the REFLO.  MIPS ECOFF requires that the
 630    REFLO immediately follow the REFHI.  As a GNU extension, we permit
 631    an arbitrary number of HI relocs to be associated with a single LO
 632    reloc.  This extension permits gcc to output the HI and LO relocs
 633    itself.  */
 634
 635 struct mips_hi
 636 {
 637   struct mips_hi *next;
 638   bfd_byte *addr;
 639   bfd_vma addend;
 640 };
 641
 642 /* FIXME: This should not be a static variable.  */
 643
 644 static struct mips_hi *mips_refhi_list;
 645
 646 static bfd_reloc_status_type
 647 mips_refhi_reloc (abfd,
 648                   reloc_entry,
 649                   symbol,
 650                   data,
 651                   input_section,
 652                   output_bfd,
 653                   error_message)
 654      bfd *abfd;
 655      arelent *reloc_entry;
 656      asymbol *symbol;
 657      PTR data;
 658      asection *input_section;
 659      bfd *output_bfd;
 660      char **error_message;
 661 {
 662   bfd_reloc_status_type ret;
 663   bfd_vma relocation;
 664   struct mips_hi *n;
 665
 666   /* If we're relocating, and this an external symbol, we don't want
 667      to change anything.  */
 668   if (output_bfd != (bfd *) NULL
 669       && (symbol->flags & BSF_SECTION_SYM) == 0
 670       && reloc_entry->addend == 0)
 671     {
 672       reloc_entry->address += input_section->output_offset;
 673       return bfd_reloc_ok;
 674     }
 675
 676   ret = bfd_reloc_ok;
 677   if (bfd_is_und_section (symbol->section)
 678       && output_bfd == (bfd *) NULL)
 679     ret = bfd_reloc_undefined;
 680
 681   if (bfd_is_com_section (symbol->section))
 682     relocation = 0;
 683   else
 684     relocation = symbol->value;
 685
 686   relocation += symbol->section->output_section->vma;
 687   relocation += symbol->section->output_offset;
 688   relocation += reloc_entry->addend;
 689
 690   if (reloc_entry->address > input_section->_cooked_size)
 691     return bfd_reloc_outofrange;
 692
 693   /* Save the information, and let REFLO do the actual relocation.  */
 694   n = (struct mips_hi *) bfd_malloc (sizeof *n);
 695   if (n == NULL)
 696     return bfd_reloc_outofrange;
 697   n->addr = (bfd_byte *) data + reloc_entry->address;
 698   n->addend = relocation;
 699   n->next = mips_refhi_list;
 700   mips_refhi_list = n;
 701
 702   if (output_bfd != (bfd *) NULL)
 703     reloc_entry->address += input_section->output_offset;
 704
 705   return ret;
 706 }
 707
 708 /* Do a REFLO relocation.  This is a straightforward 16 bit inplace
 709    relocation; this function exists in order to do the REFHI
 710    relocation described above.  */
 711
 712 static bfd_reloc_status_type
 713 mips_reflo_reloc (abfd,
 714                   reloc_entry,
 715                   symbol,
 716                   data,
 717                   input_section,
 718                   output_bfd,
 719                   error_message)
 720      bfd *abfd;
 721      arelent *reloc_entry;
 722      asymbol *symbol;
 723      PTR data;
 724      asection *input_section;
 725      bfd *output_bfd;
 726      char **error_message;
 727 {
 728   if (mips_refhi_list != NULL)
 729     {
 730       struct mips_hi *l;
 731
 732       l = mips_refhi_list;
 733       while (l != NULL)
 734         {
 735           unsigned long insn;
 736           unsigned long val;
 737           unsigned long vallo;
 738           struct mips_hi *next;
 739
 740           /* Do the REFHI relocation.  Note that we actually don't
 741              need to know anything about the REFLO itself, except
 742              where to find the low 16 bits of the addend needed by the
 743              REFHI.  */
 744           insn = bfd_get_32 (abfd, l->addr);
 745           vallo = (bfd_get_32 (abfd, (bfd_byte *) data + reloc_entry->address)
 746                    & 0xffff);
 747           val = ((insn & 0xffff) << 16) + vallo;
 748           val += l->addend;
 749
 750           /* The low order 16 bits are always treated as a signed
 751              value.  Therefore, a negative value in the low order bits
 752              requires an adjustment in the high order bits.  We need
 753              to make this adjustment in two ways: once for the bits we
 754              took from the data, and once for the bits we are putting
 755              back in to the data.  */
 756           if ((vallo & 0x8000) != 0)
 757             val -= 0x10000;
 758           if ((val & 0x8000) != 0)
 759             val += 0x10000;
 760
 761           insn = (insn &~ 0xffff) | ((val >> 16) & 0xffff);
 762           bfd_put_32 (abfd, insn, l->addr);
 763
 764           next = l->next;
 765           free (l);
 766           l = next;
 767         }
 768
 769       mips_refhi_list = NULL;
 770     }
 771
 772   /* Now do the REFLO reloc in the usual way.  */
 773   return mips_generic_reloc (abfd, reloc_entry, symbol, data,
 774                               input_section, output_bfd, error_message);
 775 }
 776
 777 /* Do a GPREL relocation.  This is a 16 bit value which must become
 778    the offset from the gp register.  */
 779
 780 static bfd_reloc_status_type
 781 mips_gprel_reloc (abfd,
 782                   reloc_entry,
 783                   symbol,
 784                   data,
 785                   input_section,
 786                   output_bfd,
 787                   error_message)
 788      bfd *abfd;
 789      arelent *reloc_entry;
 790      asymbol *symbol;
 791      PTR data;
 792      asection *input_section;
 793      bfd *output_bfd;
 794      char **error_message;
 795 {
 796   boolean relocateable;
 797   bfd_vma gp;
 798   bfd_vma relocation;
 799   unsigned long val;
 800   unsigned long insn;
 801
 802   /* If we're relocating, and this is an external symbol with no
 803      addend, we don't want to change anything.  We will only have an
 804      addend if this is a newly created reloc, not read from an ECOFF
 805      file.  */
 806   if (output_bfd != (bfd *) NULL
 807       && (symbol->flags & BSF_SECTION_SYM) == 0
 808       && reloc_entry->addend == 0)
 809     {
 810       reloc_entry->address += input_section->output_offset;
 811       return bfd_reloc_ok;
 812     }
 813
 814   if (output_bfd != (bfd *) NULL)
 815     relocateable = true;
 816   else
 817     {
 818       relocateable = false;
 819       output_bfd = symbol->section->output_section->owner;
 820     }
 821
 822   if (bfd_is_und_section (symbol->section)
 823       && relocateable == false)
 824     return bfd_reloc_undefined;
 825
 826   /* We have to figure out the gp value, so that we can adjust the
 827      symbol value correctly.  We look up the symbol _gp in the output
 828      BFD.  If we can't find it, we're stuck.  We cache it in the ECOFF
 829      target data.  We don't need to adjust the symbol value for an
 830      external symbol if we are producing relocateable output.  */
 831   gp = _bfd_get_gp_value (output_bfd);
 832   if (gp == 0
 833       && (relocateable == false
 834           || (symbol->flags & BSF_SECTION_SYM) != 0))
 835     {
 836       if (relocateable != false)
 837         {
 838           /* Make up a value.  */
 839           gp = symbol->section->output_section->vma + 0x4000;
 840           _bfd_set_gp_value (output_bfd, gp);
 841         }
 842       else
 843         {
 844           unsigned int count;
 845           asymbol **sym;
 846           unsigned int i;
 847
 848           count = bfd_get_symcount (output_bfd);
 849           sym = bfd_get_outsymbols (output_bfd);
 850
 851           if (sym == (asymbol **) NULL)
 852             i = count;
 853           else
 854             {
 855               for (i = 0; i < count; i++, sym++)
 856                 {
 857                   register CONST char *name;
 858
 859                   name = bfd_asymbol_name (*sym);
 860                   if (*name == '_' && strcmp (name, "_gp") == 0)
 861                     {
 862                       gp = bfd_asymbol_value (*sym);
 863                       _bfd_set_gp_value (output_bfd, gp);
 864                       break;
 865                     }
 866                 }
 867             }
 868
 869           if (i >= count)
 870             {
 871               /* Only get the error once.  */
 872               gp = 4;
 873               _bfd_set_gp_value (output_bfd, gp);
 874               *error_message =
 875                 (char *) _("GP relative relocation when _gp not defined");
 876               return bfd_reloc_dangerous;
 877             }
 878         }
 879     }
 880
 881   if (bfd_is_com_section (symbol->section))
 882     relocation = 0;
 883   else
 884     relocation = symbol->value;
 885
 886   relocation += symbol->section->output_section->vma;
 887   relocation += symbol->section->output_offset;
 888
 889   if (reloc_entry->address > input_section->_cooked_size)
 890     return bfd_reloc_outofrange;
 891
 892   insn = bfd_get_32 (abfd, (bfd_byte *) data + reloc_entry->address);
 893
 894   /* Set val to the offset into the section or symbol.  */
 895   val = ((insn & 0xffff) + reloc_entry->addend) & 0xffff;
 896   if (val & 0x8000)
 897     val -= 0x10000;
 898
 899   /* Adjust val for the final section location and GP value.  If we
 900      are producing relocateable output, we don't want to do this for
 901      an external symbol.  */
 902   if (relocateable == false
 903       || (symbol->flags & BSF_SECTION_SYM) != 0)
 904     val += relocation - gp;
 905
 906   insn = (insn &~ 0xffff) | (val & 0xffff);
 907   bfd_put_32 (abfd, insn, (bfd_byte *) data + reloc_entry->address);
 908
 909   if (relocateable != false)
 910     reloc_entry->address += input_section->output_offset;
 911
 912   /* Make sure it fit in 16 bits.  */
 913   if (val >= 0x8000 && val < 0xffff8000)
 914     return bfd_reloc_overflow;
 915
 916   return bfd_reloc_ok;
 917 }
 918
 919 /* Do a RELHI relocation.  We do this in conjunction with a RELLO
 920    reloc, just as REFHI and REFLO are done together.  RELHI and RELLO
 921    are Cygnus extensions used when generating position independent
 922    code for embedded systems.  */
 923
 924 /* FIXME: This should not be a static variable.  */
 925
 926 static struct mips_hi *mips_relhi_list;
 927
 928 static bfd_reloc_status_type
 929 mips_relhi_reloc (abfd,
 930                   reloc_entry,
 931                   symbol,
 932                   data,
 933                   input_section,
 934                   output_bfd,
 935                   error_message)
 936      bfd *abfd;
 937      arelent *reloc_entry;
 938      asymbol *symbol;
 939      PTR data;
 940      asection *input_section;
 941      bfd *output_bfd;
 942      char **error_message;
 943 {
 944   bfd_reloc_status_type ret;
 945   bfd_vma relocation;
 946   struct mips_hi *n;
 947
 948   /* If this is a reloc against a section symbol, then it is correct
 949      in the object file.  The only time we want to change this case is
 950      when we are relaxing, and that is handled entirely by
 951      mips_relocate_section and never calls this function.  */
 952   if ((symbol->flags & BSF_SECTION_SYM) != 0)
 953     {
 954       if (output_bfd != (bfd *) NULL)
 955         reloc_entry->address += input_section->output_offset;
 956       return bfd_reloc_ok;
 957     }
 958
 959   /* This is an external symbol.  If we're relocating, we don't want
 960      to change anything.  */
 961   if (output_bfd != (bfd *) NULL)
 962     {
 963       reloc_entry->address += input_section->output_offset;
 964       return bfd_reloc_ok;
 965     }
 966
 967   ret = bfd_reloc_ok;
 968   if (bfd_is_und_section (symbol->section)
 969       && output_bfd == (bfd *) NULL)
 970     ret = bfd_reloc_undefined;
 971
 972   if (bfd_is_com_section (symbol->section))
 973     relocation = 0;
 974   else
 975     relocation = symbol->value;
 976
 977   relocation += symbol->section->output_section->vma;
 978   relocation += symbol->section->output_offset;
 979   relocation += reloc_entry->addend;
 980
 981   if (reloc_entry->address > input_section->_cooked_size)
 982     return bfd_reloc_outofrange;
 983
 984   /* Save the information, and let RELLO do the actual relocation.  */
 985   n = (struct mips_hi *) bfd_malloc (sizeof *n);
 986   if (n == NULL)
 987     return bfd_reloc_outofrange;
 988   n->addr = (bfd_byte *) data + reloc_entry->address;
 989   n->addend = relocation;
 990   n->next = mips_relhi_list;
 991   mips_relhi_list = n;
 992
 993   if (output_bfd != (bfd *) NULL)
 994     reloc_entry->address += input_section->output_offset;
 995
 996   return ret;
 997 }
 998
 999 /* Do a RELLO relocation.  This is a straightforward 16 bit PC
1000    relative relocation; this function exists in order to do the RELHI
1001    relocation described above.  */
1002
1003 static bfd_reloc_status_type
1004 mips_rello_reloc (abfd,
1005                   reloc_entry,
1006                   symbol,
1007                   data,
1008                   input_section,
1009                   output_bfd,
1010                   error_message)
1011      bfd *abfd;
1012      arelent *reloc_entry;
1013      asymbol *symbol;
1014      PTR data;
1015      asection *input_section;
1016      bfd *output_bfd;
1017      char **error_message;
1018 {
1019   if (mips_relhi_list != NULL)
1020     {
1021       struct mips_hi *l;
1022
1023       l = mips_relhi_list;
1024       while (l != NULL)
1025         {
1026           unsigned long insn;
1027           unsigned long val;
1028           unsigned long vallo;
1029           struct mips_hi *next;
1030
1031           /* Do the RELHI relocation.  Note that we actually don't
1032              need to know anything about the RELLO itself, except
1033              where to find the low 16 bits of the addend needed by the
1034              RELHI.  */
1035           insn = bfd_get_32 (abfd, l->addr);
1036           vallo = (bfd_get_32 (abfd, (bfd_byte *) data + reloc_entry->address)
1037                    & 0xffff);
1038           val = ((insn & 0xffff) << 16) + vallo;
1039           val += l->addend;
1040
1041           /* If the symbol is defined, make val PC relative.  If the
1042              symbol is not defined we don't want to do this, because
1043              we don't want the value in the object file to incorporate
1044              the address of the reloc.  */
1045           if (! bfd_is_und_section (bfd_get_section (symbol))
1046               && ! bfd_is_com_section (bfd_get_section (symbol)))
1047             val -= (input_section->output_section->vma
1048                     + input_section->output_offset
1049                     + reloc_entry->address);
1050
1051           /* The low order 16 bits are always treated as a signed
1052              value.  Therefore, a negative value in the low order bits
1053              requires an adjustment in the high order bits.  We need
1054              to make this adjustment in two ways: once for the bits we
1055              took from the data, and once for the bits we are putting
1056              back in to the data.  */
1057           if ((vallo & 0x8000) != 0)
1058             val -= 0x10000;
1059           if ((val & 0x8000) != 0)
1060             val += 0x10000;
1061
1062           insn = (insn &~ 0xffff) | ((val >> 16) & 0xffff);
1063           bfd_put_32 (abfd, insn, l->addr);
1064
1065           next = l->next;
1066           free (l);
1067           l = next;
1068         }
1069
1070       mips_relhi_list = NULL;
1071     }
1072
1073   /* If this is a reloc against a section symbol, then it is correct
1074      in the object file.  The only time we want to change this case is
1075      when we are relaxing, and that is handled entirely by
1076      mips_relocate_section and never calls this function.  */
1077   if ((symbol->flags & BSF_SECTION_SYM) != 0)
1078     {
1079       if (output_bfd != (bfd *) NULL)
1080         reloc_entry->address += input_section->output_offset;
1081       return bfd_reloc_ok;
1082     }
1083
1084   /* bfd_perform_relocation does not handle pcrel_offset relocations
1085      correctly when generating a relocateable file, so handle them
1086      directly here.  */
1087   if (output_bfd != (bfd *) NULL)
1088     {
1089       reloc_entry->address += input_section->output_offset;
1090       return bfd_reloc_ok;
1091     }
1092
1093   /* Now do the RELLO reloc in the usual way.  */
1094   return mips_generic_reloc (abfd, reloc_entry, symbol, data,
1095                               input_section, output_bfd, error_message);
1096 }
1097
1098 /* This is the special function for the MIPS_R_SWITCH reloc.  This
1099    special reloc is normally correct in the object file, and only
1100    requires special handling when relaxing.  We don't want
1101    bfd_perform_relocation to tamper with it at all.  */
1102
1103 /*ARGSUSED*/
1104 static bfd_reloc_status_type
1105 mips_switch_reloc (abfd,
1106                    reloc_entry,
1107                    symbol,
1108                    data,
1109                    input_section,
1110                    output_bfd,
1111                    error_message)
1112      bfd *abfd;
1113      arelent *reloc_entry;
1114      asymbol *symbol;
1115      PTR data;
1116      asection *input_section;
1117      bfd *output_bfd;
1118      char **error_message;
1119 {
1120   return bfd_reloc_ok;
1121 }
1122
1123 /* Get the howto structure for a generic reloc type.  */
1124
1125 static reloc_howto_type *
1126 mips_bfd_reloc_type_lookup (abfd, code)
1127      bfd *abfd;
1128      bfd_reloc_code_real_type code;
1129 {
1130   int mips_type;
1131
1132   switch (code)
1133     {
1134     case BFD_RELOC_16:
1135       mips_type = MIPS_R_REFHALF;
1136       break;
1137     case BFD_RELOC_32:
1138     case BFD_RELOC_CTOR:
1139       mips_type = MIPS_R_REFWORD;
1140       break;
1141     case BFD_RELOC_MIPS_JMP:
1142       mips_type = MIPS_R_JMPADDR;
1143       break;
1144     case BFD_RELOC_HI16_S:
1145       mips_type = MIPS_R_REFHI;
1146       break;
1147     case BFD_RELOC_LO16:
1148       mips_type = MIPS_R_REFLO;
1149       break;
1150     case BFD_RELOC_MIPS_GPREL:
1151       mips_type = MIPS_R_GPREL;
1152       break;
1153     case BFD_RELOC_MIPS_LITERAL:
1154       mips_type = MIPS_R_LITERAL;
1155       break;
1156     case BFD_RELOC_16_PCREL_S2:
1157       mips_type = MIPS_R_PCREL16;
1158       break;
1159     case BFD_RELOC_PCREL_HI16_S:
1160       mips_type = MIPS_R_RELHI;
1161       break;
1162     case BFD_RELOC_PCREL_LO16:
1163       mips_type = MIPS_R_RELLO;
1164       break;
1165     case BFD_RELOC_GPREL32:
1166       mips_type = MIPS_R_SWITCH;
1167       break;
1168     default:
1169       return (reloc_howto_type *) NULL;
1170     }
1171
1172   return &mips_howto_table[mips_type];
1173 }
1174 \f
1175 /* A helper routine for mips_relocate_section which handles the REFHI
1176    and RELHI relocations.  The REFHI relocation must be followed by a
1177    REFLO relocation (and RELHI by a RELLO), and the addend used is
1178    formed from the addends of both instructions.  */
1179
1180 static void
1181 mips_relocate_hi (refhi, reflo, input_bfd, input_section, contents, adjust,
1182                   relocation, pcrel)
1183      struct internal_reloc *refhi;
1184      struct internal_reloc *reflo;
1185      bfd *input_bfd;
1186      asection *input_section;
1187      bfd_byte *contents;
1188      size_t adjust;
1189      bfd_vma relocation;
1190      boolean pcrel;
1191 {
1192   unsigned long insn;
1193   unsigned long val;
1194   unsigned long vallo;
1195
1196   if (refhi == NULL)
1197     return;
1198
1199   insn = bfd_get_32 (input_bfd,
1200                      contents + adjust + refhi->r_vaddr - input_section->vma);
1201   if (reflo == NULL)
1202     vallo = 0;
1203   else
1204     vallo = (bfd_get_32 (input_bfd,
1205                          contents + adjust + reflo->r_vaddr - input_section->vma)
1206              & 0xffff);
1207
1208   val = ((insn & 0xffff) << 16) + vallo;
1209   val += relocation;
1210
1211   /* The low order 16 bits are always treated as a signed value.
1212      Therefore, a negative value in the low order bits requires an
1213      adjustment in the high order bits.  We need to make this
1214      adjustment in two ways: once for the bits we took from the data,
1215      and once for the bits we are putting back in to the data.  */
1216   if ((vallo & 0x8000) != 0)
1217     val -= 0x10000;
1218
1219   if (pcrel)
1220     val -= (input_section->output_section->vma
1221             + input_section->output_offset
1222             + (reflo->r_vaddr - input_section->vma + adjust));
1223
1224   if ((val & 0x8000) != 0)
1225     val += 0x10000;
1226
1227   insn = (insn &~ 0xffff) | ((val >> 16) & 0xffff);
1228   bfd_put_32 (input_bfd, (bfd_vma) insn,
1229               contents + adjust + refhi->r_vaddr - input_section->vma);
1230 }
1231
1232 /* Relocate a section while linking a MIPS ECOFF file.  */
1233
1234 static boolean
1235 mips_relocate_section (output_bfd, info, input_bfd, input_section,
1236                        contents, external_relocs)
1237      bfd *output_bfd;
1238      struct bfd_link_info *info;
1239      bfd *input_bfd;
1240      asection *input_section;
1241      bfd_byte *contents;
1242      PTR external_relocs;
1243 {
1244   asection **symndx_to_section;
1245   struct ecoff_link_hash_entry **sym_hashes;
1246   bfd_vma gp;
1247   boolean gp_undefined;
1248   size_t adjust;
1249   long *offsets;
1250   struct external_reloc *ext_rel;
1251   struct external_reloc *ext_rel_end;
1252   unsigned int i;
1253   boolean got_lo;
1254   struct internal_reloc lo_int_rel;
1255
1256   BFD_ASSERT (input_bfd->xvec->byteorder
1257               == output_bfd->xvec->byteorder);
1258
1259   /* We keep a table mapping the symndx found in an internal reloc to
1260      the appropriate section.  This is faster than looking up the
1261      section by name each time.  */
1262   symndx_to_section = ecoff_data (input_bfd)->symndx_to_section;
1263   if (symndx_to_section == (asection **) NULL)
1264     {
1265       symndx_to_section = ((asection **)
1266                            bfd_alloc (input_bfd,
1267                                       (NUM_RELOC_SECTIONS
1268                                        * sizeof (asection *))));
1269       if (!symndx_to_section)
1270         return false;
1271
1272       symndx_to_section[RELOC_SECTION_NONE] = NULL;
1273       symndx_to_section[RELOC_SECTION_TEXT] =
1274         bfd_get_section_by_name (input_bfd, ".text");
1275       symndx_to_section[RELOC_SECTION_RDATA] =
1276         bfd_get_section_by_name (input_bfd, ".rdata");
1277       symndx_to_section[RELOC_SECTION_DATA] =
1278         bfd_get_section_by_name (input_bfd, ".data");
1279       symndx_to_section[RELOC_SECTION_SDATA] =
1280         bfd_get_section_by_name (input_bfd, ".sdata");
1281       symndx_to_section[RELOC_SECTION_SBSS] =
1282         bfd_get_section_by_name (input_bfd, ".sbss");
1283       symndx_to_section[RELOC_SECTION_BSS] =
1284         bfd_get_section_by_name (input_bfd, ".bss");
1285       symndx_to_section[RELOC_SECTION_INIT] =
1286         bfd_get_section_by_name (input_bfd, ".init");
1287       symndx_to_section[RELOC_SECTION_LIT8] =
1288         bfd_get_section_by_name (input_bfd, ".lit8");
1289       symndx_to_section[RELOC_SECTION_LIT4] =
1290         bfd_get_section_by_name (input_bfd, ".lit4");
1291       symndx_to_section[RELOC_SECTION_XDATA] = NULL;
1292       symndx_to_section[RELOC_SECTION_PDATA] = NULL;
1293       symndx_to_section[RELOC_SECTION_FINI] =
1294         bfd_get_section_by_name (input_bfd, ".fini");
1295       symndx_to_section[RELOC_SECTION_LITA] = NULL;
1296       symndx_to_section[RELOC_SECTION_ABS] = NULL;
1297
1298       ecoff_data (input_bfd)->symndx_to_section = symndx_to_section;
1299     }
1300
1301   sym_hashes = ecoff_data (input_bfd)->sym_hashes;
1302
1303   gp = _bfd_get_gp_value (output_bfd);
1304   if (gp == 0)
1305     gp_undefined = true;
1306   else
1307     gp_undefined = false;
1308
1309   got_lo = false;
1310
1311   adjust = 0;
1312
1313   if (ecoff_section_data (input_bfd, input_section) == NULL)
1314     offsets = NULL;
1315   else
1316     offsets = ecoff_section_data (input_bfd, input_section)->offsets;
1317
1318   ext_rel = (struct external_reloc *) external_relocs;
1319   ext_rel_end = ext_rel + input_section->reloc_count;
1320   for (i = 0; ext_rel < ext_rel_end; ext_rel++, i++)
1321     {
1322       struct internal_reloc int_rel;
1323       boolean use_lo = false;
1324       bfd_vma addend;
1325       reloc_howto_type *howto;
1326       struct ecoff_link_hash_entry *h = NULL;
1327       asection *s = NULL;
1328       bfd_vma relocation;
1329       bfd_reloc_status_type r;
1330
1331       if (! got_lo)
1332         mips_ecoff_swap_reloc_in (input_bfd, (PTR) ext_rel, &int_rel);
1333       else
1334         {
1335           int_rel = lo_int_rel;
1336           got_lo = false;
1337         }
1338
1339       BFD_ASSERT (int_rel.r_type
1340                   < sizeof mips_howto_table / sizeof mips_howto_table[0]);
1341
1342       /* The REFHI and RELHI relocs requires special handling.  they
1343          must be followed by a REFLO or RELLO reloc, respectively, and
1344          the addend is formed from both relocs.  */
1345       if (int_rel.r_type == MIPS_R_REFHI
1346           || int_rel.r_type == MIPS_R_RELHI)
1347         {
1348           struct external_reloc *lo_ext_rel;
1349
1350           /* As a GNU extension, permit an arbitrary number of REFHI
1351              or RELHI relocs before the REFLO or RELLO reloc.  This
1352              permits gcc to emit the HI and LO relocs itself.  */
1353           for (lo_ext_rel = ext_rel + 1;
1354                lo_ext_rel < ext_rel_end;
1355                lo_ext_rel++)
1356             {
1357               mips_ecoff_swap_reloc_in (input_bfd, (PTR) lo_ext_rel,
1358                                         &lo_int_rel);
1359               if (lo_int_rel.r_type != int_rel.r_type)
1360                 break;
1361             }
1362
1363           if (lo_ext_rel < ext_rel_end
1364               && (lo_int_rel.r_type
1365                   == (int_rel.r_type == MIPS_R_REFHI
1366                       ? MIPS_R_REFLO
1367                       : MIPS_R_RELLO))
1368               && int_rel.r_extern == lo_int_rel.r_extern
1369               && int_rel.r_symndx == lo_int_rel.r_symndx)
1370             {
1371               use_lo = true;
1372               if (lo_ext_rel == ext_rel + 1)
1373                 got_lo = true;
1374             }
1375         }
1376
1377       howto = &mips_howto_table[int_rel.r_type];
1378
1379       /* The SWITCH reloc must be handled specially.  This reloc is
1380          marks the location of a difference between two portions of an
1381          object file.  The symbol index does not reference a symbol,
1382          but is actually the offset from the reloc to the subtrahend
1383          of the difference.  This reloc is correct in the object file,
1384          and needs no further adjustment, unless we are relaxing.  If
1385          we are relaxing, we may have to add in an offset.  Since no
1386          symbols are involved in this reloc, we handle it completely
1387          here.  */
1388       if (int_rel.r_type == MIPS_R_SWITCH)
1389         {
1390           if (offsets != NULL
1391               && offsets[i] != 0)
1392             {
1393               r = _bfd_relocate_contents (howto, input_bfd,
1394                                           (bfd_vma) offsets[i],
1395                                           (contents
1396                                            + adjust
1397                                            + int_rel.r_vaddr
1398                                            - input_section->vma));
1399               BFD_ASSERT (r == bfd_reloc_ok);
1400             }
1401
1402           continue;
1403         }
1404
1405       if (int_rel.r_extern)
1406         {
1407           h = sym_hashes[int_rel.r_symndx];
1408           /* If h is NULL, that means that there is a reloc against an
1409              external symbol which we thought was just a debugging
1410              symbol.  This should not happen.  */
1411           if (h == (struct ecoff_link_hash_entry *) NULL)
1412             abort ();
1413         }
1414       else
1415         {
1416           if (int_rel.r_symndx < 0 || int_rel.r_symndx >= NUM_RELOC_SECTIONS)
1417             s = NULL;
1418           else
1419             s = symndx_to_section[int_rel.r_symndx];
1420
1421           if (s == (asection *) NULL)
1422             abort ();
1423         }
1424
1425       /* The GPREL reloc uses an addend: the difference in the GP
1426          values.  */
1427       if (int_rel.r_type != MIPS_R_GPREL
1428           && int_rel.r_type != MIPS_R_LITERAL)
1429         addend = 0;
1430       else
1431         {
1432           if (gp_undefined)
1433             {
1434               if (! ((*info->callbacks->reloc_dangerous)
1435                      (info, _("GP relative relocation when GP not defined"),
1436                       input_bfd, input_section,
1437                       int_rel.r_vaddr - input_section->vma)))
1438                 return false;
1439               /* Only give the error once per link.  */
1440               gp = 4;
1441               _bfd_set_gp_value (output_bfd, gp);
1442               gp_undefined = false;
1443             }
1444           if (! int_rel.r_extern)
1445             {
1446               /* This is a relocation against a section.  The current
1447                  addend in the instruction is the difference between
1448                  INPUT_SECTION->vma and the GP value of INPUT_BFD.  We
1449                  must change this to be the difference between the
1450                  final definition (which will end up in RELOCATION)
1451                  and the GP value of OUTPUT_BFD (which is in GP).  */
1452               addend = ecoff_data (input_bfd)->gp - gp;
1453             }
1454           else if (! info->relocateable
1455                    || h->root.type == bfd_link_hash_defined
1456                    || h->root.type == bfd_link_hash_defweak)
1457             {
1458               /* This is a relocation against a defined symbol.  The
1459                  current addend in the instruction is simply the
1460                  desired offset into the symbol (normally zero).  We
1461                  are going to change this into a relocation against a
1462                  defined symbol, so we want the instruction to hold
1463                  the difference between the final definition of the
1464                  symbol (which will end up in RELOCATION) and the GP
1465                  value of OUTPUT_BFD (which is in GP).  */
1466               addend = - gp;
1467             }
1468           else
1469             {
1470               /* This is a relocation against an undefined or common
1471                  symbol.  The current addend in the instruction is
1472                  simply the desired offset into the symbol (normally
1473                  zero).  We are generating relocateable output, and we
1474                  aren't going to define this symbol, so we just leave
1475                  the instruction alone.  */
1476               addend = 0;
1477             }
1478         }
1479
1480       /* If we are relaxing, mips_relax_section may have set
1481          offsets[i] to some value.  A value of 1 means we must expand
1482          a PC relative branch into a multi-instruction of sequence,
1483          and any other value is an addend.  */
1484       if (offsets != NULL
1485           && offsets[i] != 0)
1486         {
1487           BFD_ASSERT (! info->relocateable);
1488           BFD_ASSERT (int_rel.r_type == MIPS_R_PCREL16
1489                       || int_rel.r_type == MIPS_R_RELHI
1490                       || int_rel.r_type == MIPS_R_RELLO);
1491           if (offsets[i] != 1)
1492             addend += offsets[i];
1493           else
1494             {
1495               bfd_byte *here;
1496
1497               BFD_ASSERT (int_rel.r_extern
1498                           && int_rel.r_type == MIPS_R_PCREL16);
1499
1500               /* Move the rest of the instructions up.  */
1501               here = (contents
1502                       + adjust
1503                       + int_rel.r_vaddr
1504                       - input_section->vma);
1505               memmove (here + PCREL16_EXPANSION_ADJUSTMENT, here,
1506                        (size_t) (input_section->_raw_size
1507                                  - (int_rel.r_vaddr - input_section->vma)));
1508
1509               /* Generate the new instructions.  */
1510               if (! mips_relax_pcrel16 (info, input_bfd, input_section,
1511                                         h, here,
1512                                         (input_section->output_section->vma
1513                                          + input_section->output_offset
1514                                          + (int_rel.r_vaddr
1515                                             - input_section->vma)
1516                                          + adjust)))
1517                 return false;
1518
1519               /* We must adjust everything else up a notch.  */
1520               adjust += PCREL16_EXPANSION_ADJUSTMENT;
1521
1522               /* mips_relax_pcrel16 handles all the details of this
1523                  relocation.  */
1524               continue;
1525             }
1526         }
1527
1528       /* If we are relaxing, and this is a reloc against the .text
1529          segment, we may need to adjust it if some branches have been
1530          expanded.  The reloc types which are likely to occur in the
1531          .text section are handled efficiently by mips_relax_section,
1532          and thus do not need to be handled here.  */
1533       if (ecoff_data (input_bfd)->debug_info.adjust != NULL
1534           && ! int_rel.r_extern
1535           && int_rel.r_symndx == RELOC_SECTION_TEXT
1536           && (strcmp (bfd_get_section_name (input_bfd, input_section),
1537                       ".text") != 0
1538               || (int_rel.r_type != MIPS_R_PCREL16
1539                   && int_rel.r_type != MIPS_R_SWITCH
1540                   && int_rel.r_type != MIPS_R_RELHI
1541                   && int_rel.r_type != MIPS_R_RELLO)))
1542         {
1543           bfd_vma adr;
1544           struct ecoff_value_adjust *a;
1545
1546           /* We need to get the addend so that we know whether we need
1547              to adjust the address.  */
1548           BFD_ASSERT (int_rel.r_type == MIPS_R_REFWORD);
1549
1550           adr = bfd_get_32 (input_bfd,
1551                             (contents
1552                              + adjust
1553                              + int_rel.r_vaddr
1554                              - input_section->vma));
1555
1556           for (a = ecoff_data (input_bfd)->debug_info.adjust;
1557                a != (struct ecoff_value_adjust *) NULL;
1558                a = a->next)
1559             {
1560               if (adr >= a->start && adr < a->end)
1561                 addend += a->adjust;
1562             }
1563         }
1564
1565       if (info->relocateable)
1566         {
1567           /* We are generating relocateable output, and must convert
1568              the existing reloc.  */
1569           if (int_rel.r_extern)
1570             {
1571               if ((h->root.type == bfd_link_hash_defined
1572                    || h->root.type == bfd_link_hash_defweak)
1573                   && ! bfd_is_abs_section (h->root.u.def.section))
1574                 {
1575                   const char *name;
1576
1577                   /* This symbol is defined in the output.  Convert
1578                      the reloc from being against the symbol to being
1579                      against the section.  */
1580
1581                   /* Clear the r_extern bit.  */
1582                   int_rel.r_extern = 0;
1583
1584                   /* Compute a new r_symndx value.  */
1585                   s = h->root.u.def.section;
1586                   name = bfd_get_section_name (output_bfd,
1587                                                s->output_section);
1588
1589                   int_rel.r_symndx = -1;
1590                   switch (name[1])
1591                     {
1592                     case 'b':
1593                       if (strcmp (name, ".bss") == 0)
1594                         int_rel.r_symndx = RELOC_SECTION_BSS;
1595                       break;
1596                     case 'd':
1597                       if (strcmp (name, ".data") == 0)
1598                         int_rel.r_symndx = RELOC_SECTION_DATA;
1599                       break;
1600                     case 'f':
1601                       if (strcmp (name, ".fini") == 0)
1602                         int_rel.r_symndx = RELOC_SECTION_FINI;
1603                       break;
1604                     case 'i':
1605                       if (strcmp (name, ".init") == 0)
1606                         int_rel.r_symndx = RELOC_SECTION_INIT;
1607                       break;
1608                     case 'l':
1609                       if (strcmp (name, ".lit8") == 0)
1610                         int_rel.r_symndx = RELOC_SECTION_LIT8;
1611                       else if (strcmp (name, ".lit4") == 0)
1612                         int_rel.r_symndx = RELOC_SECTION_LIT4;
1613                       break;
1614                     case 'r':
1615                       if (strcmp (name, ".rdata") == 0)
1616                         int_rel.r_symndx = RELOC_SECTION_RDATA;
1617                       break;
1618                     case 's':
1619                       if (strcmp (name, ".sdata") == 0)
1620                         int_rel.r_symndx = RELOC_SECTION_SDATA;
1621                       else if (strcmp (name, ".sbss") == 0)
1622                         int_rel.r_symndx = RELOC_SECTION_SBSS;
1623                       break;
1624                     case 't':
1625                       if (strcmp (name, ".text") == 0)
1626                         int_rel.r_symndx = RELOC_SECTION_TEXT;
1627                       break;
1628                     }
1629
1630                   if (int_rel.r_symndx == -1)
1631                     abort ();
1632
1633                   /* Add the section VMA and the symbol value.  */
1634                   relocation = (h->root.u.def.value
1635                                 + s->output_section->vma
1636                                 + s->output_offset);
1637
1638                   /* For a PC relative relocation, the object file
1639                      currently holds just the addend.  We must adjust
1640                      by the address to get the right value.  */
1641                   if (howto->pc_relative)
1642                     {
1643                       relocation -= int_rel.r_vaddr - input_section->vma;
1644
1645                       /* If we are converting a RELHI or RELLO reloc
1646                          from being against an external symbol to
1647                          being against a section, we must put a
1648                          special value into the r_offset field.  This
1649                          value is the old addend.  The r_offset for
1650                          both the RELHI and RELLO relocs are the same,
1651                          and we set both when we see RELHI.  */
1652                       if (int_rel.r_type == MIPS_R_RELHI)
1653                         {
1654                           long addhi, addlo;
1655
1656                           addhi = bfd_get_32 (input_bfd,
1657                                               (contents
1658                                                + adjust
1659                                                + int_rel.r_vaddr
1660                                                - input_section->vma));
1661                           addhi &= 0xffff;
1662                           if (addhi & 0x8000)
1663                             addhi -= 0x10000;
1664                           addhi <<= 16;
1665
1666                           if (! use_lo)
1667                             addlo = 0;
1668                           else
1669                             {
1670                               addlo = bfd_get_32 (input_bfd,
1671                                                   (contents
1672                                                    + adjust
1673                                                    + lo_int_rel.r_vaddr
1674                                                    - input_section->vma));
1675                               addlo &= 0xffff;
1676                               if (addlo & 0x8000)
1677                                 addlo -= 0x10000;
1678
1679                               lo_int_rel.r_offset = addhi + addlo;
1680                             }
1681
1682                           int_rel.r_offset = addhi + addlo;
1683                         }
1684                     }
1685
1686                   h = NULL;
1687                 }
1688               else
1689                 {
1690                   /* Change the symndx value to the right one for the
1691                      output BFD.  */
1692                   int_rel.r_symndx = h->indx;
1693                   if (int_rel.r_symndx == -1)
1694                     {
1695                       /* This symbol is not being written out.  */
1696                       if (! ((*info->callbacks->unattached_reloc)
1697                              (info, h->root.root.string, input_bfd,
1698                               input_section,
1699                               int_rel.r_vaddr - input_section->vma)))
1700                         return false;
1701                       int_rel.r_symndx = 0;
1702                     }
1703                   relocation = 0;
1704                 }
1705             }
1706           else
1707             {
1708               /* This is a relocation against a section.  Adjust the
1709                  value by the amount the section moved.  */
1710               relocation = (s->output_section->vma
1711                             + s->output_offset
1712                             - s->vma);
1713             }
1714
1715           relocation += addend;
1716           addend = 0;
1717
1718           /* Adjust a PC relative relocation by removing the reference
1719              to the original address in the section and including the
1720              reference to the new address.  However, external RELHI
1721              and RELLO relocs are PC relative, but don't include any
1722              reference to the address.  The addend is merely an
1723              addend.  */
1724           if (howto->pc_relative
1725               && (! int_rel.r_extern
1726                   || (int_rel.r_type != MIPS_R_RELHI
1727                       && int_rel.r_type != MIPS_R_RELLO)))
1728             relocation -= (input_section->output_section->vma
1729                            + input_section->output_offset
1730                            - input_section->vma);
1731
1732           /* Adjust the contents.  */
1733           if (relocation == 0)
1734             r = bfd_reloc_ok;
1735           else
1736             {
1737               if (int_rel.r_type != MIPS_R_REFHI
1738                   && int_rel.r_type != MIPS_R_RELHI)
1739                 r = _bfd_relocate_contents (howto, input_bfd, relocation,
1740                                             (contents
1741                                              + adjust
1742                                              + int_rel.r_vaddr
1743                                              - input_section->vma));
1744               else
1745                 {
1746                   mips_relocate_hi (&int_rel,
1747                                     use_lo ? &lo_int_rel : NULL,
1748                                     input_bfd, input_section, contents,
1749                                     adjust, relocation,
1750                                     int_rel.r_type == MIPS_R_RELHI);
1751                   r = bfd_reloc_ok;
1752                 }
1753             }
1754
1755           /* Adjust the reloc address.  */
1756           int_rel.r_vaddr += (input_section->output_section->vma
1757                               + input_section->output_offset
1758                               - input_section->vma);
1759
1760           /* Save the changed reloc information.  */
1761           mips_ecoff_swap_reloc_out (input_bfd, &int_rel, (PTR) ext_rel);
1762         }
1763       else
1764         {
1765           /* We are producing a final executable.  */
1766           if (int_rel.r_extern)
1767             {
1768               /* This is a reloc against a symbol.  */
1769               if (h->root.type == bfd_link_hash_defined
1770                   || h->root.type == bfd_link_hash_defweak)
1771                 {
1772                   asection *hsec;
1773
1774                   hsec = h->root.u.def.section;
1775                   relocation = (h->root.u.def.value
1776                                 + hsec->output_section->vma
1777                                 + hsec->output_offset);
1778                 }
1779               else
1780                 {
1781                   if (! ((*info->callbacks->undefined_symbol)
1782                          (info, h->root.root.string, input_bfd,
1783                           input_section,
1784                           int_rel.r_vaddr - input_section->vma)))
1785                     return false;
1786                   relocation = 0;
1787                 }
1788             }
1789           else
1790             {
1791               /* This is a reloc against a section.  */
1792               relocation = (s->output_section->vma
1793                             + s->output_offset
1794                             - s->vma);
1795
1796               /* A PC relative reloc is already correct in the object
1797                  file.  Make it look like a pcrel_offset relocation by
1798                  adding in the start address.  */
1799               if (howto->pc_relative)
1800                 {
1801                   if (int_rel.r_type != MIPS_R_RELHI || ! use_lo)
1802                     relocation += int_rel.r_vaddr + adjust;
1803                   else
1804                     relocation += lo_int_rel.r_vaddr + adjust;
1805                 }
1806             }
1807
1808           if (int_rel.r_type != MIPS_R_REFHI
1809               && int_rel.r_type != MIPS_R_RELHI)
1810             r = _bfd_final_link_relocate (howto,
1811                                           input_bfd,
1812                                           input_section,
1813                                           contents,
1814                                           (int_rel.r_vaddr
1815                                            - input_section->vma
1816                                            + adjust),
1817                                           relocation,
1818                                           addend);
1819           else
1820             {
1821               mips_relocate_hi (&int_rel,
1822                                 use_lo ? &lo_int_rel : NULL,
1823                                 input_bfd, input_section, contents, adjust,
1824                                 relocation,
1825                                 int_rel.r_type == MIPS_R_RELHI);
1826               r = bfd_reloc_ok;
1827             }
1828         }
1829
1830       /* MIPS_R_JMPADDR requires peculiar overflow detection.  The
1831          instruction provides a 28 bit address (the two lower bits are
1832          implicit zeroes) which is combined with the upper four bits
1833          of the instruction address.  */
1834       if (r == bfd_reloc_ok
1835           && int_rel.r_type == MIPS_R_JMPADDR
1836           && (((relocation
1837                 + addend
1838                 + (int_rel.r_extern ? 0 : s->vma))
1839                & 0xf0000000)
1840               != ((input_section->output_section->vma
1841                    + input_section->output_offset
1842                    + (int_rel.r_vaddr - input_section->vma)
1843                    + adjust)
1844                   & 0xf0000000)))
1845         r = bfd_reloc_overflow;
1846
1847       if (r != bfd_reloc_ok)
1848         {
1849           switch (r)
1850             {
1851             default:
1852             case bfd_reloc_outofrange:
1853               abort ();
1854             case bfd_reloc_overflow:
1855               {
1856                 const char *name;
1857
1858                 if (int_rel.r_extern)
1859                   name = h->root.root.string;
1860                 else
1861                   name = bfd_section_name (input_bfd, s);
1862                 if (! ((*info->callbacks->reloc_overflow)
1863                        (info, name, howto->name, (bfd_vma) 0,
1864                         input_bfd, input_section,
1865                         int_rel.r_vaddr - input_section->vma)))
1866                   return false;
1867               }
1868               break;
1869             }
1870         }
1871     }
1872
1873   return true;
1874 }
1875 \f
1876 /* Read in the relocs for a section.  */
1877
1878 static boolean
1879 mips_read_relocs (abfd, sec)
1880      bfd *abfd;
1881      asection *sec;
1882 {
1883   struct ecoff_section_tdata *section_tdata;
1884
1885   section_tdata = ecoff_section_data (abfd, sec);
1886   if (section_tdata == (struct ecoff_section_tdata *) NULL)
1887     {
1888       sec->used_by_bfd =
1889         (PTR) bfd_alloc (abfd, sizeof (struct ecoff_section_tdata));
1890       if (sec->used_by_bfd == NULL)
1891         return false;
1892
1893       section_tdata = ecoff_section_data (abfd, sec);
1894       section_tdata->external_relocs = NULL;
1895       section_tdata->contents = NULL;
1896       section_tdata->offsets = NULL;
1897     }
1898
1899   if (section_tdata->external_relocs == NULL)
1900     {
1901       bfd_size_type external_relocs_size;
1902
1903       external_relocs_size = (ecoff_backend (abfd)->external_reloc_size
1904                               * sec->reloc_count);
1905
1906       section_tdata->external_relocs =
1907         (PTR) bfd_alloc (abfd, external_relocs_size);
1908       if (section_tdata->external_relocs == NULL && external_relocs_size != 0)
1909         return false;
1910
1911       if (bfd_seek (abfd, sec->rel_filepos, SEEK_SET) != 0
1912           || (bfd_read (section_tdata->external_relocs, 1,
1913                         external_relocs_size, abfd)
1914               != external_relocs_size))
1915         return false;
1916     }
1917
1918   return true;
1919 }
1920
1921 /* Relax a section when linking a MIPS ECOFF file.  This is used for
1922    embedded PIC code, which always uses PC relative branches which
1923    only have an 18 bit range on MIPS.  If a branch is not in range, we
1924    generate a long instruction sequence to compensate.  Each time we
1925    find a branch to expand, we have to check all the others again to
1926    make sure they are still in range.  This is slow, but it only has
1927    to be done when -relax is passed to the linker.
1928
1929    This routine figures out which branches need to expand; the actual
1930    expansion is done in mips_relocate_section when the section
1931    contents are relocated.  The information is stored in the offsets
1932    field of the ecoff_section_tdata structure.  An offset of 1 means
1933    that the branch must be expanded into a multi-instruction PC
1934    relative branch (such an offset will only occur for a PC relative
1935    branch to an external symbol).  Any other offset must be a multiple
1936    of four, and is the amount to change the branch by (such an offset
1937    will only occur for a PC relative branch within the same section).
1938
1939    We do not modify the section relocs or contents themselves so that
1940    if memory usage becomes an issue we can discard them and read them
1941    again.  The only information we must save in memory between this
1942    routine and the mips_relocate_section routine is the table of
1943    offsets.  */
1944
1945 static boolean
1946 mips_relax_section (abfd, sec, info, again)
1947      bfd *abfd;
1948      asection *sec;
1949      struct bfd_link_info *info;
1950      boolean *again;
1951 {
1952   struct ecoff_section_tdata *section_tdata;
1953   bfd_byte *contents = NULL;
1954   long *offsets;
1955   struct external_reloc *ext_rel;
1956   struct external_reloc *ext_rel_end;
1957   unsigned int i;
1958
1959   /* Assume we are not going to need another pass.  */
1960   *again = false;
1961
1962   /* If we are not generating an ECOFF file, this is much too
1963      confusing to deal with.  */
1964   if (info->hash->creator->flavour != bfd_get_flavour (abfd))
1965     return true;
1966
1967   /* If there are no relocs, there is nothing to do.  */
1968   if (sec->reloc_count == 0)
1969     return true;
1970
1971   /* We are only interested in PC relative relocs, and why would there
1972      ever be one from anything but the .text section?  */
1973   if (strcmp (bfd_get_section_name (abfd, sec), ".text") != 0)
1974     return true;
1975
1976   /* Read in the relocs, if we haven't already got them.  */
1977   section_tdata = ecoff_section_data (abfd, sec);
1978   if (section_tdata == (struct ecoff_section_tdata *) NULL
1979       || section_tdata->external_relocs == NULL)
1980     {
1981       if (! mips_read_relocs (abfd, sec))
1982         goto error_return;
1983       section_tdata = ecoff_section_data (abfd, sec);
1984     }
1985
1986   if (sec->_cooked_size == 0)
1987     {
1988       /* We must initialize _cooked_size only the first time we are
1989          called.  */
1990       sec->_cooked_size = sec->_raw_size;
1991     }
1992
1993   contents = section_tdata->contents;
1994   offsets = section_tdata->offsets;
1995
1996   /* Look for any external PC relative relocs.  Internal PC relative
1997      relocs are already correct in the object file, so they certainly
1998      can not overflow.  */
1999   ext_rel = (struct external_reloc *) section_tdata->external_relocs;
2000   ext_rel_end = ext_rel + sec->reloc_count;
2001   for (i = 0; ext_rel < ext_rel_end; ext_rel++, i++)
2002     {
2003       struct internal_reloc int_rel;
2004       struct ecoff_link_hash_entry *h;
2005       asection *hsec;
2006       bfd_signed_vma relocation;
2007       struct external_reloc *adj_ext_rel;
2008       unsigned int adj_i;
2009       unsigned long ext_count;
2010       struct ecoff_link_hash_entry **adj_h_ptr;
2011       struct ecoff_link_hash_entry **adj_h_ptr_end;
2012       struct ecoff_value_adjust *adjust;
2013
2014       /* If we have already expanded this reloc, we certainly don't
2015          need to do it again.  */
2016       if (offsets != (long *) NULL && offsets[i] == 1)
2017         continue;
2018
2019       /* Quickly check that this reloc is external PCREL16.  */
2020       if (bfd_header_big_endian (abfd))
2021         {
2022           if ((ext_rel->r_bits[3] & RELOC_BITS3_EXTERN_BIG) == 0
2023               || (((ext_rel->r_bits[3] & RELOC_BITS3_TYPE_BIG)
2024                    >> RELOC_BITS3_TYPE_SH_BIG)
2025                   != MIPS_R_PCREL16))
2026             continue;
2027         }
2028       else
2029         {
2030           if ((ext_rel->r_bits[3] & RELOC_BITS3_EXTERN_LITTLE) == 0
2031               || (((ext_rel->r_bits[3] & RELOC_BITS3_TYPE_LITTLE)
2032                    >> RELOC_BITS3_TYPE_SH_LITTLE)
2033                   != MIPS_R_PCREL16))
2034             continue;
2035         }
2036
2037       mips_ecoff_swap_reloc_in (abfd, (PTR) ext_rel, &int_rel);
2038
2039       h = ecoff_data (abfd)->sym_hashes[int_rel.r_symndx];
2040       if (h == (struct ecoff_link_hash_entry *) NULL)
2041         abort ();
2042
2043       if (h->root.type != bfd_link_hash_defined
2044           && h->root.type != bfd_link_hash_defweak)
2045         {
2046           /* Just ignore undefined symbols.  These will presumably
2047              generate an error later in the link.  */
2048           continue;
2049         }
2050
2051       /* Get the value of the symbol.  */
2052       hsec = h->root.u.def.section;
2053       relocation = (h->root.u.def.value
2054                     + hsec->output_section->vma
2055                     + hsec->output_offset);
2056
2057       /* Subtract out the current address.  */
2058       relocation -= (sec->output_section->vma
2059                      + sec->output_offset
2060                      + (int_rel.r_vaddr - sec->vma));
2061
2062       /* The addend is stored in the object file.  In the normal case
2063          of ``bal symbol'', the addend will be -4.  It will only be
2064          different in the case of ``bal symbol+constant''.  To avoid
2065          always reading in the section contents, we don't check the
2066          addend in the object file (we could easily check the contents
2067          if we happen to have already read them in, but I fear that
2068          this could be confusing).  This means we will screw up if
2069          there is a branch to a symbol that is in range, but added to
2070          a constant which puts it out of range; in such a case the
2071          link will fail with a reloc overflow error.  Since the
2072          compiler will never generate such code, it should be easy
2073          enough to work around it by changing the assembly code in the
2074          source file.  */
2075       relocation -= 4;
2076
2077       /* Now RELOCATION is the number we want to put in the object
2078          file.  See whether it fits.  */
2079       if (relocation >= -0x20000 && relocation < 0x20000)
2080         continue;
2081
2082       /* Now that we know this reloc needs work, which will rarely
2083          happen, go ahead and grab the section contents.  */
2084       if (contents == (bfd_byte *) NULL)
2085         {
2086           if (info->keep_memory)
2087             contents = (bfd_byte *) bfd_alloc (abfd, sec->_raw_size);
2088           else
2089             contents = (bfd_byte *) bfd_malloc ((size_t) sec->_raw_size);
2090           if (contents == (bfd_byte *) NULL)
2091             goto error_return;
2092           if (! bfd_get_section_contents (abfd, sec, (PTR) contents,
2093                                           (file_ptr) 0, sec->_raw_size))
2094             goto error_return;
2095           if (info->keep_memory)
2096             section_tdata->contents = contents;
2097         }
2098
2099       /* We only support changing the bal instruction.  It would be
2100          possible to handle other PC relative branches, but some of
2101          them (the conditional branches) would require a different
2102          length instruction sequence which would complicate both this
2103          routine and mips_relax_pcrel16.  It could be written if
2104          somebody felt it were important.  Ignoring this reloc will
2105          presumably cause a reloc overflow error later on.  */
2106       if (bfd_get_32 (abfd, contents + int_rel.r_vaddr - sec->vma)
2107           != 0x0411ffff) /* bgezal $0,. == bal . */
2108         continue;
2109
2110       /* Bother.  We need to expand this reloc, and we will need to
2111          make another relaxation pass since this change may put other
2112          relocs out of range.  We need to examine the local branches
2113          and we need to allocate memory to hold the offsets we must
2114          add to them.  We also need to adjust the values of all
2115          symbols in the object file following this location.  */
2116
2117       sec->_cooked_size += PCREL16_EXPANSION_ADJUSTMENT;
2118       *again = true;
2119
2120       if (offsets == (long *) NULL)
2121         {
2122           size_t size;
2123
2124           size = sec->reloc_count * sizeof (long);
2125           offsets = (long *) bfd_alloc (abfd, size);
2126           if (offsets == (long *) NULL)
2127             goto error_return;
2128           memset (offsets, 0, size);
2129           section_tdata->offsets = offsets;
2130         }
2131
2132       offsets[i] = 1;
2133
2134       /* Now look for all PC relative references that cross this reloc
2135          and adjust their offsets.  */
2136       adj_ext_rel = (struct external_reloc *) section_tdata->external_relocs;
2137       for (adj_i = 0; adj_ext_rel < ext_rel_end; adj_ext_rel++, adj_i++)
2138         {
2139           struct internal_reloc adj_int_rel;
2140           bfd_vma start, stop;
2141           int change;
2142
2143           mips_ecoff_swap_reloc_in (abfd, (PTR) adj_ext_rel, &adj_int_rel);
2144
2145           if (adj_int_rel.r_type == MIPS_R_PCREL16)
2146             {
2147               unsigned long insn;
2148
2149               /* We only care about local references.  External ones
2150                  will be relocated correctly anyhow.  */
2151               if (adj_int_rel.r_extern)
2152                 continue;
2153
2154               /* We are only interested in a PC relative reloc within
2155                  this section.  FIXME: Cross section PC relative
2156                  relocs may not be handled correctly; does anybody
2157                  care?  */
2158               if (adj_int_rel.r_symndx != RELOC_SECTION_TEXT)
2159                 continue;
2160
2161               start = adj_int_rel.r_vaddr;
2162
2163               insn = bfd_get_32 (abfd,
2164                                  contents + adj_int_rel.r_vaddr - sec->vma);
2165
2166               stop = (insn & 0xffff) << 2;
2167               if ((stop & 0x20000) != 0)
2168                 stop -= 0x40000;
2169               stop += adj_int_rel.r_vaddr + 4;
2170             }
2171           else if (adj_int_rel.r_type == MIPS_R_RELHI)
2172             {
2173               struct internal_reloc rello;
2174               long addhi, addlo;
2175
2176               /* The next reloc must be MIPS_R_RELLO, and we handle
2177                  them together.  */
2178               BFD_ASSERT (adj_ext_rel + 1 < ext_rel_end);
2179
2180               mips_ecoff_swap_reloc_in (abfd, (PTR) (adj_ext_rel + 1), &rello);
2181
2182               BFD_ASSERT (rello.r_type == MIPS_R_RELLO);
2183
2184               addhi = bfd_get_32 (abfd,
2185                                    contents + adj_int_rel.r_vaddr - sec->vma);
2186               addhi &= 0xffff;
2187               if (addhi & 0x8000)
2188                 addhi -= 0x10000;
2189               addhi <<= 16;
2190
2191               addlo = bfd_get_32 (abfd, contents + rello.r_vaddr - sec->vma);
2192               addlo &= 0xffff;
2193               if (addlo & 0x8000)
2194                 addlo -= 0x10000;
2195
2196               if (adj_int_rel.r_extern)
2197                 {
2198                   /* The value we want here is
2199                        sym - RELLOaddr + addend
2200                      which we can express as
2201                        sym - (RELLOaddr - addend)
2202                      Therefore if we are expanding the area between
2203                      RELLOaddr and RELLOaddr - addend we must adjust
2204                      the addend.  This is admittedly ambiguous, since
2205                      we might mean (sym + addend) - RELLOaddr, but in
2206                      practice we don't, and there is no way to handle
2207                      that case correctly since at this point we have
2208                      no idea whether any reloc is being expanded
2209                      between sym and sym + addend.  */
2210                   start = rello.r_vaddr - (addhi + addlo);
2211                   stop = rello.r_vaddr;
2212                 }
2213               else
2214                 {
2215                   /* An internal RELHI/RELLO pair represents the
2216                      difference between two addresses, $LC0 - foo.
2217                      The symndx value is actually the difference
2218                      between the reloc address and $LC0.  This lets us
2219                      compute $LC0, and, by considering the addend,
2220                      foo.  If the reloc we are expanding falls between
2221                      those two relocs, we must adjust the addend.  At
2222                      this point, the symndx value is actually in the
2223                      r_offset field, where it was put by
2224                      mips_ecoff_swap_reloc_in.  */
2225                   start = rello.r_vaddr - adj_int_rel.r_offset;
2226                   stop = start + addhi + addlo;
2227                 }
2228             }
2229           else if (adj_int_rel.r_type == MIPS_R_SWITCH)
2230             {
2231               /* A MIPS_R_SWITCH reloc represents a word of the form
2232                    .word $L3-$LS12
2233                  The value in the object file is correct, assuming the
2234                  original value of $L3.  The symndx value is actually
2235                  the difference between the reloc address and $LS12.
2236                  This lets us compute the original value of $LS12 as
2237                    vaddr - symndx
2238                  and the original value of $L3 as
2239                    vaddr - symndx + addend
2240                  where addend is the value from the object file.  At
2241                  this point, the symndx value is actually found in the
2242                  r_offset field, since it was moved by
2243                  mips_ecoff_swap_reloc_in.  */
2244               start = adj_int_rel.r_vaddr - adj_int_rel.r_offset;
2245               stop = start + bfd_get_32 (abfd,
2246                                          (contents
2247                                           + adj_int_rel.r_vaddr
2248                                           - sec->vma));
2249             }
2250           else
2251             continue;
2252
2253           /* If the range expressed by this reloc, which is the
2254              distance between START and STOP crosses the reloc we are
2255              expanding, we must adjust the offset.  The sign of the
2256              adjustment depends upon the direction in which the range
2257              crosses the reloc being expanded.  */
2258           if (start <= int_rel.r_vaddr && stop > int_rel.r_vaddr)
2259             change = PCREL16_EXPANSION_ADJUSTMENT;
2260           else if (start > int_rel.r_vaddr && stop <= int_rel.r_vaddr)
2261             change = - PCREL16_EXPANSION_ADJUSTMENT;
2262           else
2263             change = 0;
2264
2265           offsets[adj_i] += change;
2266
2267           if (adj_int_rel.r_type == MIPS_R_RELHI)
2268             {
2269               adj_ext_rel++;
2270               adj_i++;
2271               offsets[adj_i] += change;
2272             }
2273         }
2274
2275       /* Find all symbols in this section defined by this object file
2276          and adjust their values.  Note that we decide whether to
2277          adjust the value based on the value stored in the ECOFF EXTR
2278          structure, because the value stored in the hash table may
2279          have been changed by an earlier expanded reloc and thus may
2280          no longer correctly indicate whether the symbol is before or
2281          after the expanded reloc.  */
2282       ext_count = ecoff_data (abfd)->debug_info.symbolic_header.iextMax;
2283       adj_h_ptr = ecoff_data (abfd)->sym_hashes;
2284       adj_h_ptr_end = adj_h_ptr + ext_count;
2285       for (; adj_h_ptr < adj_h_ptr_end; adj_h_ptr++)
2286         {
2287           struct ecoff_link_hash_entry *adj_h;
2288
2289           adj_h = *adj_h_ptr;
2290           if (adj_h != (struct ecoff_link_hash_entry *) NULL
2291               && (adj_h->root.type == bfd_link_hash_defined
2292                   || adj_h->root.type == bfd_link_hash_defweak)
2293               && adj_h->root.u.def.section == sec
2294               && adj_h->esym.asym.value > int_rel.r_vaddr)
2295             adj_h->root.u.def.value += PCREL16_EXPANSION_ADJUSTMENT;
2296         }
2297
2298       /* Add an entry to the symbol value adjust list.  This is used
2299          by bfd_ecoff_debug_accumulate to adjust the values of
2300          internal symbols and FDR's.  */
2301       adjust = ((struct ecoff_value_adjust *)
2302                 bfd_alloc (abfd, sizeof (struct ecoff_value_adjust)));
2303       if (adjust == (struct ecoff_value_adjust *) NULL)
2304         goto error_return;
2305
2306       adjust->start = int_rel.r_vaddr;
2307       adjust->end = sec->vma + sec->_raw_size;
2308       adjust->adjust = PCREL16_EXPANSION_ADJUSTMENT;
2309
2310       adjust->next = ecoff_data (abfd)->debug_info.adjust;
2311       ecoff_data (abfd)->debug_info.adjust = adjust;
2312     }
2313
2314   if (contents != (bfd_byte *) NULL && ! info->keep_memory)
2315     free (contents);
2316
2317   return true;
2318
2319  error_return:
2320   if (contents != (bfd_byte *) NULL && ! info->keep_memory)
2321     free (contents);
2322   return false;
2323 }
2324
2325 /* This routine is called from mips_relocate_section when a PC
2326    relative reloc must be expanded into the five instruction sequence.
2327    It handles all the details of the expansion, including resolving
2328    the reloc.  */
2329
2330 static boolean
2331 mips_relax_pcrel16 (info, input_bfd, input_section, h, location, address)
2332      struct bfd_link_info *info;
2333      bfd *input_bfd;
2334      asection *input_section;
2335      struct ecoff_link_hash_entry *h;
2336      bfd_byte *location;
2337      bfd_vma address;
2338 {
2339   bfd_vma relocation;
2340
2341   /* 0x0411ffff is bgezal $0,. == bal .  */
2342   BFD_ASSERT (bfd_get_32 (input_bfd, location) == 0x0411ffff);
2343
2344   /* We need to compute the distance between the symbol and the
2345      current address plus eight.  */
2346   relocation = (h->root.u.def.value
2347                 + h->root.u.def.section->output_section->vma
2348                 + h->root.u.def.section->output_offset);
2349   relocation -= address + 8;
2350
2351   /* If the lower half is negative, increment the upper 16 half.  */
2352   if ((relocation & 0x8000) != 0)
2353     relocation += 0x10000;
2354
2355   bfd_put_32 (input_bfd, 0x04110001, location); /* bal .+8 */
2356   bfd_put_32 (input_bfd,
2357               0x3c010000 | ((relocation >> 16) & 0xffff), /* lui $at,XX */
2358               location + 4);
2359   bfd_put_32 (input_bfd,
2360               0x24210000 | (relocation & 0xffff), /* addiu $at,$at,XX */
2361               location + 8);
2362   bfd_put_32 (input_bfd, 0x003f0821, location + 12); /* addu $at,$at,$ra */
2363   bfd_put_32 (input_bfd, 0x0020f809, location + 16); /* jalr $at */
2364
2365   return true;
2366 }
2367
2368 /* Given a .sdata section and a .rel.sdata in-memory section, store
2369    relocation information into the .rel.sdata section which can be
2370    used at runtime to relocate the section.  This is called by the
2371    linker when the --embedded-relocs switch is used.  This is called
2372    after the add_symbols entry point has been called for all the
2373    objects, and before the final_link entry point is called.  This
2374    function presumes that the object was compiled using
2375    -membedded-pic.  */
2376
2377 boolean
2378 bfd_mips_ecoff_create_embedded_relocs (abfd, info, datasec, relsec, errmsg)
2379      bfd *abfd;
2380      struct bfd_link_info *info;
2381      asection *datasec;
2382      asection *relsec;
2383      char **errmsg;
2384 {
2385   struct ecoff_link_hash_entry **sym_hashes;
2386   struct ecoff_section_tdata *section_tdata;
2387   struct external_reloc *ext_rel;
2388   struct external_reloc *ext_rel_end;
2389   bfd_byte *p;
2390
2391   BFD_ASSERT (! info->relocateable);
2392
2393   *errmsg = NULL;
2394
2395   if (datasec->reloc_count == 0)
2396     return true;
2397
2398   sym_hashes = ecoff_data (abfd)->sym_hashes;
2399
2400   if (! mips_read_relocs (abfd, datasec))
2401     return false;
2402
2403   relsec->contents = (bfd_byte *) bfd_alloc (abfd, datasec->reloc_count * 4);
2404   if (relsec->contents == NULL)
2405     return false;
2406
2407   p = relsec->contents;
2408
2409   section_tdata = ecoff_section_data (abfd, datasec);
2410   ext_rel = (struct external_reloc *) section_tdata->external_relocs;
2411   ext_rel_end = ext_rel + datasec->reloc_count;
2412   for (; ext_rel < ext_rel_end; ext_rel++, p += 4)
2413     {
2414       struct internal_reloc int_rel;
2415       boolean text_relative;
2416
2417       mips_ecoff_swap_reloc_in (abfd, (PTR) ext_rel, &int_rel);
2418
2419       /* We are going to write a four byte word into the runtime reloc
2420          section.  The word will be the address in the data section
2421          which must be relocated.  This must be on a word boundary,
2422          which means the lower two bits must be zero.  We use the
2423          least significant bit to indicate how the value in the data
2424          section must be relocated.  A 0 means that the value is
2425          relative to the text section, while a 1 indicates that the
2426          value is relative to the data section.  Given that we are
2427          assuming the code was compiled using -membedded-pic, there
2428          should not be any other possibilities.  */
2429
2430       /* We can only relocate REFWORD relocs at run time.  */
2431       if (int_rel.r_type != MIPS_R_REFWORD)
2432         {
2433           *errmsg = _("unsupported reloc type");
2434           bfd_set_error (bfd_error_bad_value);
2435           return false;
2436         }
2437
2438       if (int_rel.r_extern)
2439         {
2440           struct ecoff_link_hash_entry *h;
2441
2442           h = sym_hashes[int_rel.r_symndx];
2443           /* If h is NULL, that means that there is a reloc against an
2444              external symbol which we thought was just a debugging
2445              symbol.  This should not happen.  */
2446           if (h == (struct ecoff_link_hash_entry *) NULL)
2447             abort ();
2448           if ((h->root.type == bfd_link_hash_defined
2449                || h->root.type == bfd_link_hash_defweak)
2450               && (h->root.u.def.section->flags & SEC_CODE) != 0)
2451             text_relative = true;
2452           else
2453             text_relative = false;
2454         }
2455       else
2456         {
2457           switch (int_rel.r_symndx)
2458             {
2459             case RELOC_SECTION_TEXT:
2460               text_relative = true;
2461               break;
2462             case RELOC_SECTION_SDATA:
2463             case RELOC_SECTION_SBSS:
2464             case RELOC_SECTION_LIT8:
2465               text_relative = false;
2466               break;
2467             default:
2468               /* No other sections should appear in -membedded-pic
2469                  code.  */
2470               *errmsg = _("reloc against unsupported section");
2471               bfd_set_error (bfd_error_bad_value);
2472               return false;
2473             }
2474         }
2475
2476       if ((int_rel.r_offset & 3) != 0)
2477         {
2478           *errmsg = _("reloc not properly aligned");
2479           bfd_set_error (bfd_error_bad_value);
2480           return false;
2481         }
2482
2483       bfd_put_32 (abfd,
2484                   (int_rel.r_vaddr - datasec->vma + datasec->output_offset
2485                    + (text_relative ? 0 : 1)),
2486                   p);
2487     }
2488
2489   return true;
2490 }
2491 \f
2492 /* This is the ECOFF backend structure.  The backend field of the
2493    target vector points to this.  */
2494
2495 static const struct ecoff_backend_data mips_ecoff_backend_data =
2496 {
2497   /* COFF backend structure.  */
2498   {
2499     (void (*) PARAMS ((bfd *,PTR,int,int,int,int,PTR))) bfd_void, /* aux_in */
2500     (void (*) PARAMS ((bfd *,PTR,PTR))) bfd_void, /* sym_in */
2501     (void (*) PARAMS ((bfd *,PTR,PTR))) bfd_void, /* lineno_in */
2502     (unsigned (*) PARAMS ((bfd *,PTR,int,int,int,int,PTR)))bfd_void,/*aux_out*/
2503     (unsigned (*) PARAMS ((bfd *,PTR,PTR))) bfd_void, /* sym_out */
2504     (unsigned (*) PARAMS ((bfd *,PTR,PTR))) bfd_void, /* lineno_out */
2505     (unsigned (*) PARAMS ((bfd *,PTR,PTR))) bfd_void, /* reloc_out */
2506     mips_ecoff_swap_filehdr_out, mips_ecoff_swap_aouthdr_out,
2507     mips_ecoff_swap_scnhdr_out,
2508     FILHSZ, AOUTSZ, SCNHSZ, 0, 0, 0, 0, true, false, 4,
2509     mips_ecoff_swap_filehdr_in, mips_ecoff_swap_aouthdr_in,
2510     mips_ecoff_swap_scnhdr_in, NULL,
2511     mips_ecoff_bad_format_hook, _bfd_ecoff_set_arch_mach_hook,
2512     _bfd_ecoff_mkobject_hook, _bfd_ecoff_styp_to_sec_flags,
2513     _bfd_ecoff_set_alignment_hook, _bfd_ecoff_slurp_symbol_table,
2514     NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL
2515   },
2516   /* Supported architecture.  */
2517   bfd_arch_mips,
2518   /* Initial portion of armap string.  */
2519   "__________",
2520   /* The page boundary used to align sections in a demand-paged
2521      executable file.  E.g., 0x1000.  */
2522   0x1000,
2523   /* True if the .rdata section is part of the text segment, as on the
2524      Alpha.  False if .rdata is part of the data segment, as on the
2525      MIPS.  */
2526   false,
2527   /* Bitsize of constructor entries.  */
2528   32,
2529   /* Reloc to use for constructor entries.  */
2530   &mips_howto_table[MIPS_R_REFWORD],
2531   {
2532     /* Symbol table magic number.  */
2533     magicSym,
2534     /* Alignment of debugging information.  E.g., 4.  */
2535     4,
2536     /* Sizes of external symbolic information.  */
2537     sizeof (struct hdr_ext),
2538     sizeof (struct dnr_ext),
2539     sizeof (struct pdr_ext),
2540     sizeof (struct sym_ext),
2541     sizeof (struct opt_ext),
2542     sizeof (struct fdr_ext),
2543     sizeof (struct rfd_ext),
2544     sizeof (struct ext_ext),
2545     /* Functions to swap in external symbolic data.  */
2546     ecoff_swap_hdr_in,
2547     ecoff_swap_dnr_in,
2548     ecoff_swap_pdr_in,
2549     ecoff_swap_sym_in,
2550     ecoff_swap_opt_in,
2551     ecoff_swap_fdr_in,
2552     ecoff_swap_rfd_in,
2553     ecoff_swap_ext_in,
2554     _bfd_ecoff_swap_tir_in,
2555     _bfd_ecoff_swap_rndx_in,
2556     /* Functions to swap out external symbolic data.  */
2557     ecoff_swap_hdr_out,
2558     ecoff_swap_dnr_out,
2559     ecoff_swap_pdr_out,
2560     ecoff_swap_sym_out,
2561     ecoff_swap_opt_out,
2562     ecoff_swap_fdr_out,
2563     ecoff_swap_rfd_out,
2564     ecoff_swap_ext_out,
2565     _bfd_ecoff_swap_tir_out,
2566     _bfd_ecoff_swap_rndx_out,
2567     /* Function to read in symbolic data.  */
2568     _bfd_ecoff_slurp_symbolic_info
2569   },
2570   /* External reloc size.  */
2571   RELSZ,
2572   /* Reloc swapping functions.  */
2573   mips_ecoff_swap_reloc_in,
2574   mips_ecoff_swap_reloc_out,
2575   /* Backend reloc tweaking.  */
2576   mips_adjust_reloc_in,
2577   mips_adjust_reloc_out,
2578   /* Relocate section contents while linking.  */
2579   mips_relocate_section,
2580   /* Do final adjustments to filehdr and aouthdr.  */
2581   NULL,
2582   /* Read an element from an archive at a given file position.  */
2583   _bfd_get_elt_at_filepos
2584 };
2585
2586 /* Looking up a reloc type is MIPS specific.  */
2587 #define _bfd_ecoff_bfd_reloc_type_lookup mips_bfd_reloc_type_lookup
2588
2589 /* Getting relocated section contents is generic.  */
2590 #define _bfd_ecoff_bfd_get_relocated_section_contents \
2591   bfd_generic_get_relocated_section_contents
2592
2593 /* Handling file windows is generic.  */
2594 #define _bfd_ecoff_get_section_contents_in_window \
2595   _bfd_generic_get_section_contents_in_window
2596
2597 /* Relaxing sections is MIPS specific.  */
2598 #define _bfd_ecoff_bfd_relax_section mips_relax_section
2599
2600 /* GC of sections is not done.  */
2601 #define _bfd_ecoff_bfd_gc_sections bfd_generic_gc_sections
2602
2603 const bfd_target ecoff_little_vec =
2604 {
2605   "ecoff-littlemips",           /* name */
2606   bfd_target_ecoff_flavour,
2607   BFD_ENDIAN_LITTLE,            /* data byte order is little */
2608   BFD_ENDIAN_LITTLE,            /* header byte order is little */
2609
2610   (HAS_RELOC | EXEC_P |         /* object flags */
2611    HAS_LINENO | HAS_DEBUG |
2612    HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
2613
2614   (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC | SEC_CODE | SEC_DATA),
2615   0,                            /* leading underscore */
2616   ' ',                          /* ar_pad_char */
2617   15,                           /* ar_max_namelen */
2618   bfd_getl64, bfd_getl_signed_64, bfd_putl64,
2619      bfd_getl32, bfd_getl_signed_32, bfd_putl32,
2620      bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* data */
2621   bfd_getl64, bfd_getl_signed_64, bfd_putl64,
2622      bfd_getl32, bfd_getl_signed_32, bfd_putl32,
2623      bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* hdrs */
2624
2625   {_bfd_dummy_target, coff_object_p, /* bfd_check_format */
2626      _bfd_ecoff_archive_p, _bfd_dummy_target},
2627   {bfd_false, _bfd_ecoff_mkobject,  /* bfd_set_format */
2628      _bfd_generic_mkarchive, bfd_false},
2629   {bfd_false, _bfd_ecoff_write_object_contents, /* bfd_write_contents */
2630      _bfd_write_archive_contents, bfd_false},
2631
2632      BFD_JUMP_TABLE_GENERIC (_bfd_ecoff),
2633      BFD_JUMP_TABLE_COPY (_bfd_ecoff),
2634      BFD_JUMP_TABLE_CORE (_bfd_nocore),
2635      BFD_JUMP_TABLE_ARCHIVE (_bfd_ecoff),
2636      BFD_JUMP_TABLE_SYMBOLS (_bfd_ecoff),
2637      BFD_JUMP_TABLE_RELOCS (_bfd_ecoff),
2638      BFD_JUMP_TABLE_WRITE (_bfd_ecoff),
2639      BFD_JUMP_TABLE_LINK (_bfd_ecoff),
2640      BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
2641
2642   (PTR) &mips_ecoff_backend_data
2643 };
2644
2645 const bfd_target ecoff_big_vec =
2646 {
2647   "ecoff-bigmips",              /* name */
2648   bfd_target_ecoff_flavour,
2649   BFD_ENDIAN_BIG,               /* data byte order is big */
2650   BFD_ENDIAN_BIG,               /* header byte order is big */
2651
2652   (HAS_RELOC | EXEC_P |         /* object flags */
2653    HAS_LINENO | HAS_DEBUG |
2654    HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
2655
2656   (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC | SEC_CODE | SEC_DATA),
2657   0,                            /* leading underscore */
2658   ' ',                          /* ar_pad_char */
2659   15,                           /* ar_max_namelen */
2660   bfd_getb64, bfd_getb_signed_64, bfd_putb64,
2661      bfd_getb32, bfd_getb_signed_32, bfd_putb32,
2662      bfd_getb16, bfd_getb_signed_16, bfd_putb16,
2663   bfd_getb64, bfd_getb_signed_64, bfd_putb64,
2664      bfd_getb32, bfd_getb_signed_32, bfd_putb32,
2665      bfd_getb16, bfd_getb_signed_16, bfd_putb16,
2666  {_bfd_dummy_target, coff_object_p, /* bfd_check_format */
2667     _bfd_ecoff_archive_p, _bfd_dummy_target},
2668  {bfd_false, _bfd_ecoff_mkobject, /* bfd_set_format */
2669     _bfd_generic_mkarchive, bfd_false},
2670  {bfd_false, _bfd_ecoff_write_object_contents, /* bfd_write_contents */
2671     _bfd_write_archive_contents, bfd_false},
2672
2673      BFD_JUMP_TABLE_GENERIC (_bfd_ecoff),
2674      BFD_JUMP_TABLE_COPY (_bfd_ecoff),
2675      BFD_JUMP_TABLE_CORE (_bfd_nocore),
2676      BFD_JUMP_TABLE_ARCHIVE (_bfd_ecoff),
2677      BFD_JUMP_TABLE_SYMBOLS (_bfd_ecoff),
2678      BFD_JUMP_TABLE_RELOCS (_bfd_ecoff),
2679      BFD_JUMP_TABLE_WRITE (_bfd_ecoff),
2680      BFD_JUMP_TABLE_LINK (_bfd_ecoff),
2681      BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
2682
2683   (PTR) &mips_ecoff_backend_data
2684 };
2685
2686 const bfd_target ecoff_biglittle_vec =
2687 {
2688   "ecoff-biglittlemips",                /* name */
2689   bfd_target_ecoff_flavour,
2690   BFD_ENDIAN_LITTLE,            /* data byte order is little */
2691   BFD_ENDIAN_BIG,               /* header byte order is big */
2692
2693   (HAS_RELOC | EXEC_P |         /* object flags */
2694    HAS_LINENO | HAS_DEBUG |
2695    HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
2696
2697   (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC | SEC_CODE | SEC_DATA),
2698   0,                            /* leading underscore */
2699   ' ',                          /* ar_pad_char */
2700   15,                           /* ar_max_namelen */
2701   bfd_getl64, bfd_getl_signed_64, bfd_putl64,
2702      bfd_getl32, bfd_getl_signed_32, bfd_putl32,
2703      bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* data */
2704   bfd_getb64, bfd_getb_signed_64, bfd_putb64,
2705      bfd_getb32, bfd_getb_signed_32, bfd_putb32,
2706      bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* hdrs */
2707
2708   {_bfd_dummy_target, coff_object_p, /* bfd_check_format */
2709      _bfd_ecoff_archive_p, _bfd_dummy_target},
2710   {bfd_false, _bfd_ecoff_mkobject,  /* bfd_set_format */
2711      _bfd_generic_mkarchive, bfd_false},
2712   {bfd_false, _bfd_ecoff_write_object_contents, /* bfd_write_contents */
2713      _bfd_write_archive_contents, bfd_false},
2714
2715      BFD_JUMP_TABLE_GENERIC (_bfd_ecoff),
2716      BFD_JUMP_TABLE_COPY (_bfd_ecoff),
2717      BFD_JUMP_TABLE_CORE (_bfd_nocore),
2718      BFD_JUMP_TABLE_ARCHIVE (_bfd_ecoff),
2719      BFD_JUMP_TABLE_SYMBOLS (_bfd_ecoff),
2720      BFD_JUMP_TABLE_RELOCS (_bfd_ecoff),
2721      BFD_JUMP_TABLE_WRITE (_bfd_ecoff),
2722      BFD_JUMP_TABLE_LINK (_bfd_ecoff),
2723      BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
2724
2725   (PTR) &mips_ecoff_backend_data
2726 };