bfd/pe-mips.c

   1 /* BFD back-end for MIPS PE COFF files.
   2    Copyright (C) 1990-2015 Free Software Foundation, Inc.
   3    Modified from coff-i386.c by DJ Delorie, dj@cygnus.com
   4
   5    This file is part of BFD, the Binary File Descriptor library.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  20    MA 02110-1301, USA.  */
  21
  22 #define COFF_WITH_PE
  23 /* pei-mips.c may have defined this to default off (0) before
  24   including this file, so don't redefine if that's the case.
  25   Otherwise we're generating objects, not executable images,
  26   so we want to define it to default on.  */
  27 #ifndef COFF_LONG_SECTION_NAMES
  28 #define COFF_LONG_SECTION_NAMES
  29 #endif /* COFF_LONG_SECTION_NAMES */
  30 #define PCRELOFFSET TRUE
  31
  32 #include "sysdep.h"
  33 #include "bfd.h"
  34 #include "libbfd.h"
  35 #include "coff/mipspe.h"
  36 #include "coff/internal.h"
  37 #include "coff/pe.h"
  38 #include "libcoff.h"
  39
  40 #define COFF_DEFAULT_SECTION_ALIGNMENT_POWER 2
  41 /* The page size is a guess based on ELF.  */
  42
  43 #define COFF_PAGE_SIZE 0x1000
  44
  45 /* For some reason when using mips COFF the value stored in the .text
  46    section for a reference to a common symbol is the value itself plus
  47    any desired offset.  Ian Taylor, Cygnus Support.  */
  48
  49 /* If we are producing relocatable output, we need to do some
  50    adjustments to the object file that are not done by the
  51    bfd_perform_relocation function.  This function is called by every
  52    reloc type to make any required adjustments.  */
  53
  54 static bfd_reloc_status_type
  55 coff_mips_reloc (bfd *abfd,
  56                  arelent *reloc_entry,
  57                  asymbol *symbol,
  58                  void * data,
  59                  asection *input_section ATTRIBUTE_UNUSED,
  60                  bfd *output_bfd,
  61                  char **error_message ATTRIBUTE_UNUSED)
  62 {
  63   symvalue diff;
  64
  65   if (output_bfd == NULL)
  66     return bfd_reloc_continue;
  67
  68   if (bfd_is_com_section (symbol->section))
  69     {
  70 #ifndef COFF_WITH_PE
  71       /* We are relocating a common symbol.  The current value in the
  72          object file is ORIG + OFFSET, where ORIG is the value of the
  73          common symbol as seen by the object file when it was compiled
  74          (this may be zero if the symbol was undefined) and OFFSET is
  75          the offset into the common symbol (normally zero, but may be
  76          non-zero when referring to a field in a common structure).
  77          ORIG is the negative of reloc_entry->addend, which is set by
  78          the CALC_ADDEND macro below.  We want to replace the value in
  79          the object file with NEW + OFFSET, where NEW is the value of
  80          the common symbol which we are going to put in the final
  81          object file.  NEW is symbol->value.  */
  82       diff = symbol->value + reloc_entry->addend;
  83 #else
  84       /* In PE mode, we do not offset the common symbol.  */
  85       diff = reloc_entry->addend;
  86 #endif
  87     }
  88   else
  89     /* For some reason bfd_perform_relocation always effectively
  90        ignores the addend for a COFF target when producing
  91        relocatable output.  This seems to be always wrong for 386
  92        COFF, so we handle the addend here instead.  */
  93     diff = reloc_entry->addend;
  94
  95 #define DOIT(x) \
  96   x = ((x & ~howto->dst_mask) | (((x & howto->src_mask) + (diff >> howto->rightshift)) & howto->dst_mask))
  97
  98     if (diff != 0)
  99       {
 100         reloc_howto_type *howto = reloc_entry->howto;
 101         unsigned char *addr = (unsigned char *) data + reloc_entry->address;
 102
 103         switch (howto->size)
 104           {
 105           case 0:
 106             {
 107               char x = bfd_get_8 (abfd, addr);
 108
 109               DOIT (x);
 110               bfd_put_8 (abfd, x, addr);
 111             }
 112             break;
 113
 114           case 1:
 115             {
 116               short x = bfd_get_16 (abfd, addr);
 117
 118               DOIT (x);
 119               bfd_put_16 (abfd, (bfd_vma) x, addr);
 120             }
 121             break;
 122
 123           case 2:
 124             {
 125               long x = bfd_get_32 (abfd, addr);
 126
 127               DOIT (x);
 128               bfd_put_32 (abfd, (bfd_vma) x, addr);
 129             }
 130             break;
 131
 132           default:
 133             abort ();
 134           }
 135       }
 136
 137   /* Now let bfd_perform_relocation finish everything up.  */
 138   return bfd_reloc_continue;
 139 }
 140
 141 #ifdef COFF_WITH_PE
 142 /* Return TRUE if this relocation should
 143    appear in the output .reloc section.  */
 144
 145 static bfd_boolean
 146 in_reloc_p (bfd * abfd ATTRIBUTE_UNUSED, reloc_howto_type *howto)
 147 {
 148   return ! howto->pc_relative && howto->type != MIPS_R_RVA;
 149 }
 150 #endif
 151
 152 #ifndef PCRELOFFSET
 153 #define PCRELOFFSET FALSE
 154 #endif
 155
 156 static reloc_howto_type howto_table[] =
 157 {
 158   /* Reloc type 0 is ignored.  The reloc reading code ensures that
 159      this is a reference to the .abs section, which will cause
 160      bfd_perform_relocation to do nothing.  */
 161   HOWTO (MIPS_R_ABSOLUTE,       /* Type.  */
 162          0,                     /* Rightshift.  */
 163          0,                     /* Size (0 = byte, 1 = short, 2 = long).  */
 164          8,                     /* Bitsize.  */
 165          FALSE,                 /* PC_relative.  */
 166          0,                     /* Bitpos. */
 167          complain_overflow_dont, /* Complain_on_overflow. */
 168          0,                     /* Special_function. */
 169          "IGNORE",              /* Name. */
 170          FALSE,                 /* Partial_inplace. */
 171          0,                     /* Src_mask. */
 172          0,                     /* Dst_mask. */
 173          FALSE),                /* Pcrel_offset. */
 174
 175   /* A 16 bit reference to a symbol, normally from a data section.  */
 176   HOWTO (MIPS_R_REFHALF,        /* Type.  */
 177          0,                     /* Rightshift.  */
 178          1,                     /* Size (0 = byte, 1 = short, 2 = long).  */
 179          16,                    /* Bitsize.  */
 180          FALSE,                 /* PC_relative.  */
 181          0,                     /* Bitpos. */
 182          complain_overflow_bitfield, /* Complain_on_overflow. */
 183          coff_mips_reloc,       /* Special_function. */
 184          "REFHALF",             /* Name. */
 185          TRUE,                  /* Partial_inplace. */
 186          0xffff,                /* Src_mask. */
 187          0xffff,                /* Dst_mask. */
 188          FALSE),                /* Pcrel_offset. */
 189
 190   /* A 32 bit reference to a symbol, normally from a data section.  */
 191   HOWTO (MIPS_R_REFWORD,        /* Type.  */
 192          0,                     /* Rightshift.  */
 193          2,                     /* Size (0 = byte, 1 = short, 2 = long).  */
 194          32,                    /* Bitsize.  */
 195          FALSE,                 /* PC_relative.  */
 196          0,                     /* Bitpos. */
 197          complain_overflow_bitfield, /* Complain_on_overflow. */
 198          coff_mips_reloc,       /* Special_function. */
 199          "REFWORD",             /* Name. */
 200          TRUE,                  /* Partial_inplace. */
 201          0xffffffff,            /* Src_mask. */
 202          0xffffffff,            /* Dst_mask. */
 203          FALSE),                /* Pcrel_offset. */
 204
 205   /* A 26 bit absolute jump address.  */
 206   HOWTO (MIPS_R_JMPADDR,        /* Type.  */
 207          2,                     /* Rightshift.  */
 208          2,                     /* Size (0 = byte, 1 = short, 2 = long).  */
 209          26,                    /* Bitsize.  */
 210          FALSE,                 /* PC_relative.  */
 211          0,                     /* Bitpos. */
 212          complain_overflow_dont, /* Complain_on_overflow. */
 213                                 /* This needs complex overflow
 214                                    detection, because the upper four
 215                                    bits must match the PC.  */
 216          coff_mips_reloc,       /* Special_function. */
 217          "JMPADDR",             /* Name. */
 218          TRUE,                  /* Partial_inplace. */
 219          0x3ffffff,             /* Src_mask. */
 220          0x3ffffff,             /* Dst_mask. */
 221          FALSE),                /* Pcrel_offset. */
 222
 223   /* The high 16 bits of a symbol value.  Handled by the function
 224      mips_refhi_reloc.  */
 225   HOWTO (MIPS_R_REFHI,          /* Type.  */
 226          16,                    /* Rightshift.  */
 227          2,                     /* Size (0 = byte, 1 = short, 2 = long).  */
 228          16,                    /* Bitsize.  */
 229          FALSE,                 /* PC_relative.  */
 230          0,                     /* Bitpos. */
 231          complain_overflow_bitfield, /* Complain_on_overflow. */
 232          coff_mips_reloc,       /* Special_function. */
 233          "REFHI",               /* Name. */
 234          TRUE,                  /* Partial_inplace. */
 235          0xffff,                /* Src_mask. */
 236          0xffff,                /* Dst_mask. */
 237          FALSE),                /* Pcrel_offset. */
 238
 239   /* The low 16 bits of a symbol value.  */
 240   HOWTO (MIPS_R_REFLO,          /* Type.  */
 241          0,                     /* Rightshift.  */
 242          2,                     /* Size (0 = byte, 1 = short, 2 = long).  */
 243          16,                    /* Bitsize.  */
 244          FALSE,                 /* PC_relative.  */
 245          0,                     /* Bitpos. */
 246          complain_overflow_dont, /* Complain_on_overflow. */
 247          coff_mips_reloc,       /* Special_function. */
 248          "REFLO",               /* Name. */
 249          TRUE,                  /* Partial_inplace. */
 250          0xffff,                /* Src_mask. */
 251          0xffff,                /* Dst_mask. */
 252          FALSE),                /* Pcrel_offset. */
 253
 254   /* A reference to an offset from the gp register.  Handled by the
 255      function mips_gprel_reloc.  */
 256   HOWTO (MIPS_R_GPREL,          /* Type.  */
 257          0,                     /* Rightshift.  */
 258          2,                     /* Size (0 = byte, 1 = short, 2 = long).  */
 259          16,                    /* Bitsize.  */
 260          FALSE,                 /* PC_relative.  */
 261          0,                     /* Bitpos. */
 262          complain_overflow_signed, /* Complain_on_overflow. */
 263          coff_mips_reloc,       /* Special_function. */
 264          "GPREL",               /* Name. */
 265          TRUE,                  /* Partial_inplace. */
 266          0xffff,                /* Src_mask. */
 267          0xffff,                /* Dst_mask. */
 268          FALSE),                /* Pcrel_offset. */
 269
 270   /* A reference to a literal using an offset from the gp register.
 271      Handled by the function mips_gprel_reloc.  */
 272   HOWTO (MIPS_R_LITERAL,        /* Type.  */
 273          0,                     /* Rightshift.  */
 274          2,                     /* Size (0 = byte, 1 = short, 2 = long).  */
 275          16,                    /* Bitsize.  */
 276          FALSE,                 /* PC_relative.  */
 277          0,                     /* Bitpos. */
 278          complain_overflow_signed, /* Complain_on_overflow. */
 279          coff_mips_reloc,       /* Special_function. */
 280          "LITERAL",             /* Name. */
 281          TRUE,                  /* Partial_inplace. */
 282          0xffff,                /* Src_mask. */
 283          0xffff,                /* Dst_mask. */
 284          FALSE),                /* Pcrel_offset. */
 285
 286   EMPTY_HOWTO (8),
 287   EMPTY_HOWTO (9),
 288   EMPTY_HOWTO (10),
 289   EMPTY_HOWTO (11),
 290   EMPTY_HOWTO (12),
 291   EMPTY_HOWTO (13),
 292   EMPTY_HOWTO (14),
 293   EMPTY_HOWTO (15),
 294   EMPTY_HOWTO (16),
 295   EMPTY_HOWTO (17),
 296   EMPTY_HOWTO (18),
 297   EMPTY_HOWTO (19),
 298   EMPTY_HOWTO (20),
 299   EMPTY_HOWTO (21),
 300   EMPTY_HOWTO (22),
 301   EMPTY_HOWTO (23),
 302   EMPTY_HOWTO (24),
 303   EMPTY_HOWTO (25),
 304   EMPTY_HOWTO (26),
 305   EMPTY_HOWTO (27),
 306   EMPTY_HOWTO (28),
 307   EMPTY_HOWTO (29),
 308   EMPTY_HOWTO (30),
 309   EMPTY_HOWTO (31),
 310   EMPTY_HOWTO (32),
 311   EMPTY_HOWTO (33),
 312   HOWTO (MIPS_R_RVA,            /* Type.  */
 313          0,                     /* Rightshift.  */
 314          2,                     /* Size (0 = byte, 1 = short, 2 = long).  */
 315          32,                    /* Bitsize.  */
 316          FALSE,                 /* PC_relative.  */
 317          0,                     /* Bitpos. */
 318          complain_overflow_bitfield, /* Complain_on_overflow. */
 319          coff_mips_reloc,       /* Special_function. */
 320          "rva32",               /* Name. */
 321          TRUE,                  /* Partial_inplace. */
 322          0xffffffff,            /* Src_mask. */
 323          0xffffffff,            /* Dst_mask. */
 324          FALSE),                /* Pcrel_offset. */
 325   EMPTY_HOWTO (35),
 326   EMPTY_HOWTO (36),
 327   HOWTO (MIPS_R_PAIR,           /* Type.  */
 328          0,                     /* Rightshift.  */
 329          2,                     /* Size (0 = byte, 1 = short, 2 = long).  */
 330          32,                    /* Bitsize.  */
 331          FALSE,                 /* PC_relative.  */
 332          0,                     /* Bitpos. */
 333          complain_overflow_bitfield, /* Complain_on_overflow. */
 334          coff_mips_reloc,       /* Special_function. */
 335          "PAIR",                /* Name. */
 336          TRUE,                  /* Partial_inplace. */
 337          0xffffffff,            /* Src_mask. */
 338          0xffffffff,            /* Dst_mask. */
 339          FALSE),                /* Pcrel_offset. */
 340 };
 341
 342 #define NUM_HOWTOS (sizeof (howto_table) / sizeof (howto_table[0]))
 343
 344 /* Turn a howto into a reloc nunmber.  */
 345
 346 #define SELECT_RELOC(x, howto) { x.r_type = howto->type; }
 347 #define BADMAG(x)              MIPSBADMAG (x)
 348
 349 /* Customize coffcode.h.  */
 350 #define MIPS 1
 351
 352 #define RTYPE2HOWTO(cache_ptr, dst)                             \
 353   ((cache_ptr)->howto =                                         \
 354    ((dst)->r_type < NUM_HOWTOS                                  \
 355     ? howto_table + (dst)->r_type                               \
 356     : NULL))
 357
 358 /* Compute the addend of a reloc.  If the reloc is to a common symbol,
 359    the object file contains the value of the common symbol.  By the
 360    time this is called, the linker may be using a different symbol
 361    from a different object file with a different value.  Therefore, we
 362    hack wildly to locate the original symbol from this file so that we
 363    can make the correct adjustment.  This macro sets coffsym to the
 364    symbol from the original file, and uses it to set the addend value
 365    correctly.  If this is not a common symbol, the usual addend
 366    calculation is done, except that an additional tweak is needed for
 367    PC relative relocs.
 368    FIXME: This macro refers to symbols and asect; these are from the
 369    calling function, not the macro arguments.  */
 370
 371 #define CALC_ADDEND(abfd, ptr, reloc, cache_ptr)                \
 372   {                                                             \
 373     coff_symbol_type *coffsym = NULL;                           \
 374     if (ptr && bfd_asymbol_bfd (ptr) != abfd)                   \
 375       coffsym = (obj_symbols (abfd)                             \
 376                  + (cache_ptr->sym_ptr_ptr - symbols));         \
 377     else if (ptr)                                               \
 378       coffsym = coff_symbol_from (ptr);                         \
 379     if (coffsym != NULL                                         \
 380         && coffsym->native->u.syment.n_scnum == 0)              \
 381       cache_ptr->addend = - coffsym->native->u.syment.n_value;  \
 382     else if (ptr && bfd_asymbol_bfd (ptr) == abfd               \
 383              && ptr->section != NULL)                           \
 384       cache_ptr->addend = - (ptr->section->vma + ptr->value);   \
 385     else                                                        \
 386       cache_ptr->addend = 0;                                    \
 387     if (ptr && reloc.r_type < NUM_HOWTOS                        \
 388         && howto_table[reloc.r_type].pc_relative)               \
 389       cache_ptr->addend += asect->vma;                          \
 390   }
 391
 392 /* Convert an rtype to howto for the COFF backend linker.  */
 393
 394 static reloc_howto_type *
 395 coff_mips_rtype_to_howto (bfd *abfd ATTRIBUTE_UNUSED,
 396                           asection *sec,
 397                           struct internal_reloc *rel,
 398                           struct coff_link_hash_entry *h,
 399                           struct internal_syment *sym,
 400                           bfd_vma *addendp)
 401 {
 402
 403   reloc_howto_type *howto;
 404
 405   howto = howto_table + rel->r_type;
 406
 407 #ifdef COFF_WITH_PE
 408   *addendp = 0;
 409 #endif
 410
 411   if (howto->pc_relative)
 412     *addendp += sec->vma;
 413
 414   if (sym != NULL && sym->n_scnum == 0 && sym->n_value != 0)
 415     {
 416       /* This is a common symbol.  The section contents include the
 417          size (sym->n_value) as an addend.  The relocate_section
 418          function will be adding in the final value of the symbol.  We
 419          need to subtract out the current size in order to get the
 420          correct result.  */
 421
 422       BFD_ASSERT (h != NULL);
 423
 424 #ifndef COFF_WITH_PE
 425       /* I think we *do* want to bypass this.  If we don't, I have
 426          seen some data parameters get the wrong relocation address.
 427          If I link two versions with and without this section bypassed
 428          and then do a binary comparison, the addresses which are
 429          different can be looked up in the map.  The case in which
 430          this section has been bypassed has addresses which correspond
 431          to values I can find in the map.  */
 432       *addendp -= sym->n_value;
 433 #endif
 434     }
 435
 436 #ifndef COFF_WITH_PE
 437   /* If the output symbol is common (in which case this must be a
 438      relocatable link), we need to add in the final size of the
 439      common symbol.  */
 440   if (h != NULL && h->root.type == bfd_link_hash_common)
 441     *addendp += h->root.u.c.size;
 442 #endif
 443
 444 #ifdef COFF_WITH_PE
 445   if (howto->pc_relative)
 446     {
 447       *addendp -= 4;
 448
 449       /* If the symbol is defined, then the generic code is going to
 450          add back the symbol value in order to cancel out an
 451          adjustment it made to the addend.  However, we set the addend
 452          to 0 at the start of this function.  We need to adjust here,
 453          to avoid the adjustment the generic code will make.  FIXME:
 454          This is getting a bit hackish.  */
 455       if (sym != NULL && sym->n_scnum != 0)
 456         *addendp -= sym->n_value;
 457     }
 458
 459   if (rel->r_type == MIPS_R_RVA)
 460     *addendp -= pe_data (sec->output_section->owner)->pe_opthdr.ImageBase;
 461 #endif
 462
 463   return howto;
 464 }
 465
 466 #define coff_rtype_to_howto         coff_mips_rtype_to_howto
 467 #define coff_bfd_reloc_type_lookup  coff_mips_reloc_type_lookup
 468 #define coff_bfd_reloc_name_lookup coff_mips_reloc_name_lookup
 469
 470 /* Get the howto structure for a generic reloc type.  */
 471
 472 static reloc_howto_type *
 473 coff_mips_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
 474                              bfd_reloc_code_real_type code)
 475 {
 476   int mips_type;
 477
 478   switch (code)
 479     {
 480     case BFD_RELOC_16:
 481       mips_type = MIPS_R_REFHALF;
 482       break;
 483     case BFD_RELOC_32:
 484     case BFD_RELOC_CTOR:
 485       mips_type = MIPS_R_REFWORD;
 486       break;
 487     case BFD_RELOC_MIPS_JMP:
 488       mips_type = MIPS_R_JMPADDR;
 489       break;
 490     case BFD_RELOC_HI16_S:
 491       mips_type = MIPS_R_REFHI;
 492       break;
 493     case BFD_RELOC_LO16:
 494       mips_type = MIPS_R_REFLO;
 495       break;
 496     case BFD_RELOC_GPREL16:
 497       mips_type = MIPS_R_GPREL;
 498       break;
 499     case BFD_RELOC_MIPS_LITERAL:
 500       mips_type = MIPS_R_LITERAL;
 501       break;
 502     case BFD_RELOC_RVA:
 503       mips_type = MIPS_R_RVA;
 504       break;
 505     default:
 506       return NULL;
 507     }
 508
 509   return & howto_table [mips_type];
 510 }
 511
 512 static reloc_howto_type *
 513 coff_mips_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
 514                              const char *r_name)
 515 {
 516   unsigned int i;
 517
 518   for (i = 0; i < NUM_HOWTOS; i++)
 519     if (howto_table[i].name != NULL
 520         && strcasecmp (howto_table[i].name, r_name) == 0)
 521       return &howto_table[i];
 522
 523   return NULL;
 524 }
 525
 526 static void
 527 mips_swap_reloc_in (bfd * abfd, void * src, void * dst)
 528 {
 529   static struct internal_reloc pair_prev;
 530   RELOC *reloc_src = (RELOC *) src;
 531   struct internal_reloc *reloc_dst = (struct internal_reloc *) dst;
 532
 533   reloc_dst->r_vaddr = H_GET_32 (abfd, reloc_src->r_vaddr);
 534   reloc_dst->r_symndx = H_GET_S32 (abfd, reloc_src->r_symndx);
 535   reloc_dst->r_type = H_GET_16 (abfd, reloc_src->r_type);
 536   reloc_dst->r_size = 0;
 537   reloc_dst->r_extern = 0;
 538   reloc_dst->r_offset = 0;
 539
 540   switch (reloc_dst->r_type)
 541   {
 542   case MIPS_R_REFHI:
 543     pair_prev = *reloc_dst;
 544     break;
 545   case MIPS_R_PAIR:
 546     reloc_dst->r_offset = reloc_dst->r_symndx;
 547     if (reloc_dst->r_offset & 0x8000)
 548       reloc_dst->r_offset -= 0x10000;
 549     reloc_dst->r_symndx = pair_prev.r_symndx;
 550     break;
 551   }
 552 }
 553
 554 static unsigned int
 555 mips_swap_reloc_out (bfd * abfd, void * src, void * dst)
 556 {
 557   static bfd_vma prev_addr = 0;
 558   struct internal_reloc *reloc_src = (struct internal_reloc *)src;
 559   struct external_reloc *reloc_dst = (struct external_reloc *)dst;
 560
 561   switch (reloc_src->r_type)
 562     {
 563     case MIPS_R_REFHI:
 564       prev_addr = reloc_src->r_vaddr;
 565       break;
 566     case MIPS_R_REFLO:
 567       if (reloc_src->r_vaddr == prev_addr)
 568         {
 569           /* FIXME: only slightly hackish.  If we see a REFLO pointing to
 570              the same address as a REFHI, we assume this is the matching
 571              PAIR reloc and output it accordingly.  The symndx is really
 572              the low 16 bits of the addend */
 573           H_PUT_32 (abfd, reloc_src->r_vaddr, reloc_dst->r_vaddr);
 574           H_PUT_32 (abfd, reloc_src->r_symndx, reloc_dst->r_symndx);
 575           H_PUT_16 (abfd, MIPS_R_PAIR, reloc_dst->r_type);
 576           return RELSZ;
 577         }
 578       break;
 579     }
 580
 581   H_PUT_32 (abfd, reloc_src->r_vaddr, reloc_dst->r_vaddr);
 582   H_PUT_32 (abfd, reloc_src->r_symndx, reloc_dst->r_symndx);
 583
 584   H_PUT_16 (abfd, reloc_src->r_type, reloc_dst->r_type);
 585   return RELSZ;
 586 }
 587
 588 #define coff_swap_reloc_in   mips_swap_reloc_in
 589 #define coff_swap_reloc_out  mips_swap_reloc_out
 590 #define NO_COFF_RELOCS
 591
 592 static bfd_boolean
 593 coff_pe_mips_relocate_section (bfd *output_bfd,
 594                                struct bfd_link_info *info,
 595                                bfd *input_bfd,
 596                                asection *input_section,
 597                                bfd_byte *contents,
 598                                struct internal_reloc *relocs,
 599                                struct internal_syment *syms,
 600                                asection **sections)
 601 {
 602   struct internal_reloc *rel;
 603   struct internal_reloc *rel_end;
 604   unsigned int i;
 605
 606   if (bfd_link_relocatable (info))
 607     {
 608       (*_bfd_error_handler)
 609         (_("%B: `ld -r' not supported with PE MIPS objects\n"), input_bfd);
 610       bfd_set_error (bfd_error_bad_value);
 611       return FALSE;
 612     }
 613
 614   BFD_ASSERT (input_bfd->xvec->byteorder
 615               == output_bfd->xvec->byteorder);
 616
 617   rel = relocs;
 618   rel_end = rel + input_section->reloc_count;
 619
 620   for (i = 0; rel < rel_end; rel++, i++)
 621     {
 622       long symndx;
 623       struct coff_link_hash_entry *h;
 624       struct internal_syment *sym;
 625       bfd_vma addend = 0;
 626       bfd_vma val, tmp, targ, src, low;
 627       reloc_howto_type *howto;
 628       unsigned char *mem = contents + rel->r_vaddr;
 629
 630       symndx = rel->r_symndx;
 631
 632       if (symndx == -1)
 633         {
 634           h = NULL;
 635           sym = NULL;
 636         }
 637       else
 638         {
 639           h = obj_coff_sym_hashes (input_bfd)[symndx];
 640           sym = syms + symndx;
 641         }
 642
 643       /* COFF treats common symbols in one of two ways.  Either the
 644          size of the symbol is included in the section contents, or it
 645          is not.  We assume that the size is not included, and force
 646          the rtype_to_howto function to adjust the addend as needed.  */
 647
 648       if (sym != NULL && sym->n_scnum != 0)
 649         addend = - sym->n_value;
 650       else
 651         addend = 0;
 652
 653       howto = bfd_coff_rtype_to_howto (input_bfd, input_section, rel, h,
 654                                        sym, &addend);
 655       if (howto == NULL)
 656         return FALSE;
 657
 658       /* If we are doing a relocatable link, then we can just ignore
 659          a PC relative reloc that is pcrel_offset.  It will already
 660          have the correct value.  If this is not a relocatable link,
 661          then we should ignore the symbol value.  */
 662       if (howto->pc_relative && howto->pcrel_offset)
 663         {
 664           if (bfd_link_relocatable (info))
 665             continue;
 666           if (sym != NULL && sym->n_scnum != 0)
 667             addend += sym->n_value;
 668         }
 669
 670       val = 0;
 671
 672       if (h == NULL)
 673         {
 674           asection *sec;
 675
 676           if (symndx == -1)
 677             {
 678               sec = bfd_abs_section_ptr;
 679               val = 0;
 680             }
 681           else
 682             {
 683               sec = sections[symndx];
 684               val = (sec->output_section->vma
 685                      + sec->output_offset
 686                      + sym->n_value);
 687               if (! obj_pe (input_bfd))
 688                 val -= sec->vma;
 689             }
 690         }
 691       else
 692         {
 693           if (h->root.type == bfd_link_hash_defined
 694               || h->root.type == bfd_link_hash_defweak)
 695             {
 696               asection *sec;
 697
 698               sec = h->root.u.def.section;
 699               val = (h->root.u.def.value
 700                      + sec->output_section->vma
 701                      + sec->output_offset);
 702               }
 703
 704           else if (! bfd_link_relocatable (info))
 705             {
 706               if (! ((*info->callbacks->undefined_symbol)
 707                      (info, h->root.root.string, input_bfd, input_section,
 708                       rel->r_vaddr - input_section->vma, TRUE)))
 709                 return FALSE;
 710             }
 711         }
 712
 713       src = rel->r_vaddr + input_section->output_section->vma
 714         + input_section->output_offset;
 715
 716       /* OK, at this point the following variables are set up:
 717            src = VMA of the memory we're fixing up
 718            mem = pointer to memory we're fixing up
 719            val = VMA of what we need to refer to.  */
 720
 721 #define UI(x) (*_bfd_error_handler) (_("%B: unimplemented %s\n"), \
 722                                      input_bfd, x); \
 723               bfd_set_error (bfd_error_bad_value);
 724
 725       switch (rel->r_type)
 726         {
 727         case MIPS_R_ABSOLUTE:
 728           /* Ignore these.  */
 729           break;
 730
 731         case MIPS_R_REFHALF:
 732           UI ("refhalf");
 733           break;
 734
 735         case MIPS_R_REFWORD:
 736           tmp = bfd_get_32 (input_bfd, mem);
 737           /* printf ("refword: src=%08x targ=%08x+%08x\n", src, tmp, val); */
 738           tmp += val;
 739           bfd_put_32 (input_bfd, tmp, mem);
 740           break;
 741
 742         case MIPS_R_JMPADDR:
 743           tmp = bfd_get_32 (input_bfd, mem);
 744           targ = val + (tmp & 0x03ffffff) * 4;
 745           if ((src & 0xf0000000) != (targ & 0xf0000000))
 746             {
 747               (*_bfd_error_handler) (_("%B: jump too far away\n"), input_bfd);
 748               bfd_set_error (bfd_error_bad_value);
 749               return FALSE;
 750             }
 751           tmp &= 0xfc000000;
 752           tmp |= (targ / 4) & 0x3ffffff;
 753           bfd_put_32 (input_bfd, tmp, mem);
 754           break;
 755
 756         case MIPS_R_REFHI:
 757           tmp = bfd_get_32 (input_bfd, mem);
 758           switch (rel[1].r_type)
 759             {
 760             case MIPS_R_PAIR:
 761               /* MS PE object */
 762               targ = val + rel[1].r_offset + ((tmp & 0xffff) << 16);
 763               break;
 764             case MIPS_R_REFLO:
 765               /* GNU COFF object */
 766               low = bfd_get_32 (input_bfd, contents + rel[1].r_vaddr);
 767               low &= 0xffff;
 768               if (low & 0x8000)
 769                 low -= 0x10000;
 770               targ = val + low + ((tmp & 0xffff) << 16);
 771               break;
 772             default:
 773               (*_bfd_error_handler) (_("%B: bad pair/reflo after refhi\n"),
 774                                      input_bfd);
 775               bfd_set_error (bfd_error_bad_value);
 776               return FALSE;
 777             }
 778           tmp &= 0xffff0000;
 779           tmp |= (targ >> 16) & 0xffff;
 780           bfd_put_32 (input_bfd, tmp, mem);
 781           break;
 782
 783         case MIPS_R_REFLO:
 784           tmp = bfd_get_32 (input_bfd, mem);
 785           targ = val + (tmp & 0xffff);
 786           /* printf ("refword: src=%08x targ=%08x\n", src, targ); */
 787           tmp &= 0xffff0000;
 788           tmp |= targ & 0xffff;
 789           bfd_put_32 (input_bfd, tmp, mem);
 790           break;
 791
 792         case MIPS_R_GPREL:
 793         case MIPS_R_LITERAL:
 794           UI ("gprel");
 795           break;
 796
 797         case MIPS_R_SECTION:
 798           UI ("section");
 799           break;
 800
 801         case MIPS_R_SECREL:
 802           UI ("secrel");
 803           break;
 804
 805         case MIPS_R_SECRELLO:
 806           UI ("secrello");
 807           break;
 808
 809         case MIPS_R_SECRELHI:
 810           UI ("secrelhi");
 811           break;
 812
 813         case MIPS_R_RVA:
 814           tmp = bfd_get_32 (input_bfd, mem);
 815           /* printf ("rva: src=%08x targ=%08x+%08x\n", src, tmp, val); */
 816           tmp += val
 817             - pe_data (input_section->output_section->owner)->pe_opthdr.ImageBase;
 818           bfd_put_32 (input_bfd, tmp, mem);
 819           break;
 820
 821         case MIPS_R_PAIR:
 822           /* ignore these */
 823           break;
 824         }
 825     }
 826
 827   return TRUE;
 828 }
 829
 830 #define coff_relocate_section coff_pe_mips_relocate_section
 831
 832 #ifdef TARGET_UNDERSCORE
 833
 834 /* If mips gcc uses underscores for symbol names, then it does not use
 835    a leading dot for local labels, so if TARGET_UNDERSCORE is defined
 836    we treat all symbols starting with L as local.  */
 837
 838 static bfd_boolean
 839 coff_mips_is_local_label_name (bfd *abfd, const char *name)
 840 {
 841   if (name[0] == 'L')
 842     return TRUE;
 843
 844   return _bfd_coff_is_local_label_name (abfd, name);
 845 }
 846
 847 #define coff_bfd_is_local_label_name coff_mips_is_local_label_name
 848
 849 #endif /* TARGET_UNDERSCORE */
 850
 851 #define COFF_NO_HACK_SCNHDR_SIZE
 852
 853 #ifndef bfd_pe_print_pdata
 854 #define bfd_pe_print_pdata      NULL
 855 #endif
 856
 857 #include "coffcode.h"
 858
 859 const bfd_target
 860 #ifdef TARGET_SYM
 861   TARGET_SYM =
 862 #else
 863   mips_pe_le_vec =
 864 #endif
 865 {
 866 #ifdef TARGET_NAME
 867   TARGET_NAME,
 868 #else
 869   "pe-mips",                    /* Name.  */
 870 #endif
 871   bfd_target_coff_flavour,
 872   BFD_ENDIAN_LITTLE,            /* Data byte order is little.  */
 873   BFD_ENDIAN_LITTLE,            /* Header byte order is little.  */
 874
 875   (HAS_RELOC | EXEC_P |         /* Object flags.  */
 876    HAS_LINENO | HAS_DEBUG |
 877    HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
 878
 879 #ifndef COFF_WITH_PE
 880   (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC /* Section flags.  */
 881    | SEC_CODE | SEC_DATA),
 882 #else
 883   (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC /* Section flags.  */
 884    | SEC_CODE | SEC_DATA
 885    | SEC_LINK_ONCE | SEC_LINK_DUPLICATES),
 886 #endif
 887
 888 #ifdef TARGET_UNDERSCORE
 889   TARGET_UNDERSCORE,            /* Leading underscore.  */
 890 #else
 891   0,                            /* leading underscore */
 892 #endif
 893   '/',                          /* AR_pad_char.  */
 894   15,                           /* AR_max_namelen.  */
 895   0,                            /* match priority.  */
 896
 897   bfd_getl64, bfd_getl_signed_64, bfd_putl64,
 898      bfd_getl32, bfd_getl_signed_32, bfd_putl32,
 899      bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* Data.  */
 900   bfd_getl64, bfd_getl_signed_64, bfd_putl64,
 901      bfd_getl32, bfd_getl_signed_32, bfd_putl32,
 902      bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* Headers.  */
 903
 904   /* Note that we allow an object file to be treated as a core file as well.  */
 905   {_bfd_dummy_target, coff_object_p, /* bfd_check_format.  */
 906    bfd_generic_archive_p, coff_object_p},
 907   {bfd_false, coff_mkobject, _bfd_generic_mkarchive, /* bfd_set_format.  */
 908    bfd_false},
 909   {bfd_false, coff_write_object_contents, /* bfd_write_contents.  */
 910    _bfd_write_archive_contents, bfd_false},
 911
 912   BFD_JUMP_TABLE_GENERIC (coff),
 913   BFD_JUMP_TABLE_COPY (coff),
 914   BFD_JUMP_TABLE_CORE (_bfd_nocore),
 915   BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_coff),
 916   BFD_JUMP_TABLE_SYMBOLS (coff),
 917   BFD_JUMP_TABLE_RELOCS (coff),
 918   BFD_JUMP_TABLE_WRITE (coff),
 919   BFD_JUMP_TABLE_LINK (coff),
 920   BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
 921
 922   NULL,
 923
 924   COFF_SWAP_TABLE
 925 };