bfd/pe-mips.c

   1 /* BFD back-end for MIPS PE COFF files.
   2    Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
   3    2000, 2001, 2002, 2003, 2004, 2005, 2007 Free Software Foundation, Inc.
   4    Modified from coff-i386.c by DJ Delorie, dj@cygnus.com
   5
   6    This file is part of BFD, the Binary File Descriptor library.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */
  21
  22 #define COFF_WITH_PE
  23 #define COFF_LONG_SECTION_NAMES
  24 #define PCRELOFFSET TRUE
  25
  26 #include "sysdep.h"
  27 #include "bfd.h"
  28 #include "libbfd.h"
  29 #include "coff/mipspe.h"
  30 #include "coff/internal.h"
  31 #include "coff/pe.h"
  32 #include "libcoff.h"
  33
  34 #define COFF_DEFAULT_SECTION_ALIGNMENT_POWER 2
  35 /* The page size is a guess based on ELF.  */
  36
  37 #define COFF_PAGE_SIZE 0x1000
  38
  39 /* For some reason when using mips COFF the value stored in the .text
  40    section for a reference to a common symbol is the value itself plus
  41    any desired offset.  Ian Taylor, Cygnus Support.  */
  42
  43 /* If we are producing relocatable output, we need to do some
  44    adjustments to the object file that are not done by the
  45    bfd_perform_relocation function.  This function is called by every
  46    reloc type to make any required adjustments.  */
  47
  48 static bfd_reloc_status_type
  49 coff_mips_reloc (bfd *abfd,
  50                  arelent *reloc_entry,
  51                  asymbol *symbol,
  52                  void * data,
  53                  asection *input_section ATTRIBUTE_UNUSED,
  54                  bfd *output_bfd,
  55                  char **error_message ATTRIBUTE_UNUSED)
  56 {
  57   symvalue diff;
  58
  59   if (output_bfd == NULL)
  60     return bfd_reloc_continue;
  61
  62   if (bfd_is_com_section (symbol->section))
  63     {
  64 #ifndef COFF_WITH_PE
  65       /* We are relocating a common symbol.  The current value in the
  66          object file is ORIG + OFFSET, where ORIG is the value of the
  67          common symbol as seen by the object file when it was compiled
  68          (this may be zero if the symbol was undefined) and OFFSET is
  69          the offset into the common symbol (normally zero, but may be
  70          non-zero when referring to a field in a common structure).
  71          ORIG is the negative of reloc_entry->addend, which is set by
  72          the CALC_ADDEND macro below.  We want to replace the value in
  73          the object file with NEW + OFFSET, where NEW is the value of
  74          the common symbol which we are going to put in the final
  75          object file.  NEW is symbol->value.  */
  76       diff = symbol->value + reloc_entry->addend;
  77 #else
  78       /* In PE mode, we do not offset the common symbol.  */
  79       diff = reloc_entry->addend;
  80 #endif
  81     }
  82   else
  83     /* For some reason bfd_perform_relocation always effectively
  84        ignores the addend for a COFF target when producing
  85        relocatable output.  This seems to be always wrong for 386
  86        COFF, so we handle the addend here instead.  */
  87     diff = reloc_entry->addend;
  88
  89 #define DOIT(x) \
  90   x = ((x & ~howto->dst_mask) | (((x & howto->src_mask) + (diff >> howto->rightshift)) & howto->dst_mask))
  91
  92     if (diff != 0)
  93       {
  94         reloc_howto_type *howto = reloc_entry->howto;
  95         unsigned char *addr = (unsigned char *) data + reloc_entry->address;
  96
  97         switch (howto->size)
  98           {
  99           case 0:
 100             {
 101               char x = bfd_get_8 (abfd, addr);
 102
 103               DOIT (x);
 104               bfd_put_8 (abfd, x, addr);
 105             }
 106             break;
 107
 108           case 1:
 109             {
 110               short x = bfd_get_16 (abfd, addr);
 111
 112               DOIT (x);
 113               bfd_put_16 (abfd, (bfd_vma) x, addr);
 114             }
 115             break;
 116
 117           case 2:
 118             {
 119               long x = bfd_get_32 (abfd, addr);
 120
 121               DOIT (x);
 122               bfd_put_32 (abfd, (bfd_vma) x, addr);
 123             }
 124             break;
 125
 126           default:
 127             abort ();
 128           }
 129       }
 130
 131   /* Now let bfd_perform_relocation finish everything up.  */
 132   return bfd_reloc_continue;
 133 }
 134
 135 #ifdef COFF_WITH_PE
 136 /* Return TRUE if this relocation should
 137    appear in the output .reloc section.  */
 138
 139 static bfd_boolean
 140 in_reloc_p (bfd * abfd ATTRIBUTE_UNUSED, reloc_howto_type *howto)
 141 {
 142   return ! howto->pc_relative && howto->type != MIPS_R_RVA;
 143 }
 144 #endif
 145
 146 #ifndef PCRELOFFSET
 147 #define PCRELOFFSET FALSE
 148 #endif
 149
 150 static reloc_howto_type howto_table[] =
 151 {
 152   /* Reloc type 0 is ignored.  The reloc reading code ensures that
 153      this is a reference to the .abs section, which will cause
 154      bfd_perform_relocation to do nothing.  */
 155   HOWTO (MIPS_R_ABSOLUTE,       /* Type.  */
 156          0,                     /* Rightshift.  */
 157          0,                     /* Size (0 = byte, 1 = short, 2 = long).  */
 158          8,                     /* Bitsize.  */
 159          FALSE,                 /* PC_relative.  */
 160          0,                     /* Bitpos. */
 161          complain_overflow_dont, /* Complain_on_overflow. */
 162          0,                     /* Special_function. */
 163          "IGNORE",              /* Name. */
 164          FALSE,                 /* Partial_inplace. */
 165          0,                     /* Src_mask. */
 166          0,                     /* Dst_mask. */
 167          FALSE),                /* Pcrel_offset. */
 168
 169   /* A 16 bit reference to a symbol, normally from a data section.  */
 170   HOWTO (MIPS_R_REFHALF,        /* Type.  */
 171          0,                     /* Rightshift.  */
 172          1,                     /* Size (0 = byte, 1 = short, 2 = long).  */
 173          16,                    /* Bitsize.  */
 174          FALSE,                 /* PC_relative.  */
 175          0,                     /* Bitpos. */
 176          complain_overflow_bitfield, /* Complain_on_overflow. */
 177          coff_mips_reloc,       /* Special_function. */
 178          "REFHALF",             /* Name. */
 179          TRUE,                  /* Partial_inplace. */
 180          0xffff,                /* Src_mask. */
 181          0xffff,                /* Dst_mask. */
 182          FALSE),                /* Pcrel_offset. */
 183
 184   /* A 32 bit reference to a symbol, normally from a data section.  */
 185   HOWTO (MIPS_R_REFWORD,        /* Type.  */
 186          0,                     /* Rightshift.  */
 187          2,                     /* Size (0 = byte, 1 = short, 2 = long).  */
 188          32,                    /* Bitsize.  */
 189          FALSE,                 /* PC_relative.  */
 190          0,                     /* Bitpos. */
 191          complain_overflow_bitfield, /* Complain_on_overflow. */
 192          coff_mips_reloc,       /* Special_function. */
 193          "REFWORD",             /* Name. */
 194          TRUE,                  /* Partial_inplace. */
 195          0xffffffff,            /* Src_mask. */
 196          0xffffffff,            /* Dst_mask. */
 197          FALSE),                /* Pcrel_offset. */
 198
 199   /* A 26 bit absolute jump address.  */
 200   HOWTO (MIPS_R_JMPADDR,        /* Type.  */
 201          2,                     /* Rightshift.  */
 202          2,                     /* Size (0 = byte, 1 = short, 2 = long).  */
 203          26,                    /* Bitsize.  */
 204          FALSE,                 /* PC_relative.  */
 205          0,                     /* Bitpos. */
 206          complain_overflow_dont, /* Complain_on_overflow. */
 207                                 /* This needs complex overflow
 208                                    detection, because the upper four
 209                                    bits must match the PC.  */
 210          coff_mips_reloc,       /* Special_function. */
 211          "JMPADDR",             /* Name. */
 212          TRUE,                  /* Partial_inplace. */
 213          0x3ffffff,             /* Src_mask. */
 214          0x3ffffff,             /* Dst_mask. */
 215          FALSE),                /* Pcrel_offset. */
 216
 217   /* The high 16 bits of a symbol value.  Handled by the function
 218      mips_refhi_reloc.  */
 219   HOWTO (MIPS_R_REFHI,          /* Type.  */
 220          16,                    /* Rightshift.  */
 221          2,                     /* Size (0 = byte, 1 = short, 2 = long).  */
 222          16,                    /* Bitsize.  */
 223          FALSE,                 /* PC_relative.  */
 224          0,                     /* Bitpos. */
 225          complain_overflow_bitfield, /* Complain_on_overflow. */
 226          coff_mips_reloc,       /* Special_function. */
 227          "REFHI",               /* Name. */
 228          TRUE,                  /* Partial_inplace. */
 229          0xffff,                /* Src_mask. */
 230          0xffff,                /* Dst_mask. */
 231          FALSE),                /* Pcrel_offset. */
 232
 233   /* The low 16 bits of a symbol value.  */
 234   HOWTO (MIPS_R_REFLO,          /* Type.  */
 235          0,                     /* Rightshift.  */
 236          2,                     /* Size (0 = byte, 1 = short, 2 = long).  */
 237          16,                    /* Bitsize.  */
 238          FALSE,                 /* PC_relative.  */
 239          0,                     /* Bitpos. */
 240          complain_overflow_dont, /* Complain_on_overflow. */
 241          coff_mips_reloc,       /* Special_function. */
 242          "REFLO",               /* Name. */
 243          TRUE,                  /* Partial_inplace. */
 244          0xffff,                /* Src_mask. */
 245          0xffff,                /* Dst_mask. */
 246          FALSE),                /* Pcrel_offset. */
 247
 248   /* A reference to an offset from the gp register.  Handled by the
 249      function mips_gprel_reloc.  */
 250   HOWTO (MIPS_R_GPREL,          /* Type.  */
 251          0,                     /* Rightshift.  */
 252          2,                     /* Size (0 = byte, 1 = short, 2 = long).  */
 253          16,                    /* Bitsize.  */
 254          FALSE,                 /* PC_relative.  */
 255          0,                     /* Bitpos. */
 256          complain_overflow_signed, /* Complain_on_overflow. */
 257          coff_mips_reloc,       /* Special_function. */
 258          "GPREL",               /* Name. */
 259          TRUE,                  /* Partial_inplace. */
 260          0xffff,                /* Src_mask. */
 261          0xffff,                /* Dst_mask. */
 262          FALSE),                /* Pcrel_offset. */
 263
 264   /* A reference to a literal using an offset from the gp register.
 265      Handled by the function mips_gprel_reloc.  */
 266   HOWTO (MIPS_R_LITERAL,        /* Type.  */
 267          0,                     /* Rightshift.  */
 268          2,                     /* Size (0 = byte, 1 = short, 2 = long).  */
 269          16,                    /* Bitsize.  */
 270          FALSE,                 /* PC_relative.  */
 271          0,                     /* Bitpos. */
 272          complain_overflow_signed, /* Complain_on_overflow. */
 273          coff_mips_reloc,       /* Special_function. */
 274          "LITERAL",             /* Name. */
 275          TRUE,                  /* Partial_inplace. */
 276          0xffff,                /* Src_mask. */
 277          0xffff,                /* Dst_mask. */
 278          FALSE),                /* Pcrel_offset. */
 279
 280   EMPTY_HOWTO (8),
 281   EMPTY_HOWTO (9),
 282   EMPTY_HOWTO (10),
 283   EMPTY_HOWTO (11),
 284   EMPTY_HOWTO (12),
 285   EMPTY_HOWTO (13),
 286   EMPTY_HOWTO (14),
 287   EMPTY_HOWTO (15),
 288   EMPTY_HOWTO (16),
 289   EMPTY_HOWTO (17),
 290   EMPTY_HOWTO (18),
 291   EMPTY_HOWTO (19),
 292   EMPTY_HOWTO (20),
 293   EMPTY_HOWTO (21),
 294   EMPTY_HOWTO (22),
 295   EMPTY_HOWTO (23),
 296   EMPTY_HOWTO (24),
 297   EMPTY_HOWTO (25),
 298   EMPTY_HOWTO (26),
 299   EMPTY_HOWTO (27),
 300   EMPTY_HOWTO (28),
 301   EMPTY_HOWTO (29),
 302   EMPTY_HOWTO (30),
 303   EMPTY_HOWTO (31),
 304   EMPTY_HOWTO (32),
 305   EMPTY_HOWTO (33),
 306   HOWTO (MIPS_R_RVA,            /* Type.  */
 307          0,                     /* Rightshift.  */
 308          2,                     /* Size (0 = byte, 1 = short, 2 = long).  */
 309          32,                    /* Bitsize.  */
 310          FALSE,                 /* PC_relative.  */
 311          0,                     /* Bitpos. */
 312          complain_overflow_bitfield, /* Complain_on_overflow. */
 313          coff_mips_reloc,       /* Special_function. */
 314          "rva32",               /* Name. */
 315          TRUE,                  /* Partial_inplace. */
 316          0xffffffff,            /* Src_mask. */
 317          0xffffffff,            /* Dst_mask. */
 318          FALSE),                /* Pcrel_offset. */
 319   EMPTY_HOWTO (35),
 320   EMPTY_HOWTO (36),
 321   HOWTO (MIPS_R_PAIR,           /* Type.  */
 322          0,                     /* Rightshift.  */
 323          2,                     /* Size (0 = byte, 1 = short, 2 = long).  */
 324          32,                    /* Bitsize.  */
 325          FALSE,                 /* PC_relative.  */
 326          0,                     /* Bitpos. */
 327          complain_overflow_bitfield, /* Complain_on_overflow. */
 328          coff_mips_reloc,       /* Special_function. */
 329          "PAIR",                /* Name. */
 330          TRUE,                  /* Partial_inplace. */
 331          0xffffffff,            /* Src_mask. */
 332          0xffffffff,            /* Dst_mask. */
 333          FALSE),                /* Pcrel_offset. */
 334 };
 335
 336 /* Turn a howto into a reloc nunmber.  */
 337
 338 #define SELECT_RELOC(x, howto) { x.r_type = howto->type; }
 339 #define BADMAG(x)              MIPSBADMAG (x)
 340
 341 /* Customize coffcode.h.  */
 342 #define MIPS 1
 343
 344 #define RTYPE2HOWTO(cache_ptr, dst) \
 345             (cache_ptr)->howto = howto_table + (dst)->r_type;
 346
 347 /* Compute the addend of a reloc.  If the reloc is to a common symbol,
 348    the object file contains the value of the common symbol.  By the
 349    time this is called, the linker may be using a different symbol
 350    from a different object file with a different value.  Therefore, we
 351    hack wildly to locate the original symbol from this file so that we
 352    can make the correct adjustment.  This macro sets coffsym to the
 353    symbol from the original file, and uses it to set the addend value
 354    correctly.  If this is not a common symbol, the usual addend
 355    calculation is done, except that an additional tweak is needed for
 356    PC relative relocs.
 357    FIXME: This macro refers to symbols and asect; these are from the
 358    calling function, not the macro arguments.  */
 359
 360 #define CALC_ADDEND(abfd, ptr, reloc, cache_ptr)                \
 361   {                                                             \
 362     coff_symbol_type *coffsym = NULL;                           \
 363     if (ptr && bfd_asymbol_bfd (ptr) != abfd)                   \
 364       coffsym = (obj_symbols (abfd)                             \
 365                  + (cache_ptr->sym_ptr_ptr - symbols));         \
 366     else if (ptr)                                               \
 367       coffsym = coff_symbol_from (abfd, ptr);                   \
 368     if (coffsym != NULL                                         \
 369         && coffsym->native->u.syment.n_scnum == 0)              \
 370       cache_ptr->addend = - coffsym->native->u.syment.n_value;  \
 371     else if (ptr && bfd_asymbol_bfd (ptr) == abfd               \
 372              && ptr->section != NULL)                           \
 373       cache_ptr->addend = - (ptr->section->vma + ptr->value);   \
 374     else                                                        \
 375       cache_ptr->addend = 0;                                    \
 376     if (ptr && howto_table[reloc.r_type].pc_relative)           \
 377       cache_ptr->addend += asect->vma;                          \
 378   }
 379
 380 /* Convert an rtype to howto for the COFF backend linker.  */
 381
 382 static reloc_howto_type *
 383 coff_mips_rtype_to_howto (bfd *abfd ATTRIBUTE_UNUSED,
 384                           asection *sec,
 385                           struct internal_reloc *rel,
 386                           struct coff_link_hash_entry *h,
 387                           struct internal_syment *sym,
 388                           bfd_vma *addendp)
 389 {
 390
 391   reloc_howto_type *howto;
 392
 393   howto = howto_table + rel->r_type;
 394
 395 #ifdef COFF_WITH_PE
 396   *addendp = 0;
 397 #endif
 398
 399   if (howto->pc_relative)
 400     *addendp += sec->vma;
 401
 402   if (sym != NULL && sym->n_scnum == 0 && sym->n_value != 0)
 403     {
 404       /* This is a common symbol.  The section contents include the
 405          size (sym->n_value) as an addend.  The relocate_section
 406          function will be adding in the final value of the symbol.  We
 407          need to subtract out the current size in order to get the
 408          correct result.  */
 409
 410       BFD_ASSERT (h != NULL);
 411
 412 #ifndef COFF_WITH_PE
 413       /* I think we *do* want to bypass this.  If we don't, I have
 414          seen some data parameters get the wrong relocation address.
 415          If I link two versions with and without this section bypassed
 416          and then do a binary comparison, the addresses which are
 417          different can be looked up in the map.  The case in which
 418          this section has been bypassed has addresses which correspond
 419          to values I can find in the map.  */
 420       *addendp -= sym->n_value;
 421 #endif
 422     }
 423
 424 #ifndef COFF_WITH_PE
 425   /* If the output symbol is common (in which case this must be a
 426      relocatable link), we need to add in the final size of the
 427      common symbol.  */
 428   if (h != NULL && h->root.type == bfd_link_hash_common)
 429     *addendp += h->root.u.c.size;
 430 #endif
 431
 432 #ifdef COFF_WITH_PE
 433   if (howto->pc_relative)
 434     {
 435       *addendp -= 4;
 436
 437       /* If the symbol is defined, then the generic code is going to
 438          add back the symbol value in order to cancel out an
 439          adjustment it made to the addend.  However, we set the addend
 440          to 0 at the start of this function.  We need to adjust here,
 441          to avoid the adjustment the generic code will make.  FIXME:
 442          This is getting a bit hackish.  */
 443       if (sym != NULL && sym->n_scnum != 0)
 444         *addendp -= sym->n_value;
 445     }
 446
 447   if (rel->r_type == MIPS_R_RVA)
 448     *addendp -= pe_data (sec->output_section->owner)->pe_opthdr.ImageBase;
 449 #endif
 450
 451   return howto;
 452 }
 453
 454 #define coff_rtype_to_howto         coff_mips_rtype_to_howto
 455 #define coff_bfd_reloc_type_lookup  coff_mips_reloc_type_lookup
 456 #define coff_bfd_reloc_name_lookup coff_mips_reloc_name_lookup
 457
 458 /* Get the howto structure for a generic reloc type.  */
 459
 460 static reloc_howto_type *
 461 coff_mips_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
 462                              bfd_reloc_code_real_type code)
 463 {
 464   int mips_type;
 465
 466   switch (code)
 467     {
 468     case BFD_RELOC_16:
 469       mips_type = MIPS_R_REFHALF;
 470       break;
 471     case BFD_RELOC_32:
 472     case BFD_RELOC_CTOR:
 473       mips_type = MIPS_R_REFWORD;
 474       break;
 475     case BFD_RELOC_MIPS_JMP:
 476       mips_type = MIPS_R_JMPADDR;
 477       break;
 478     case BFD_RELOC_HI16_S:
 479       mips_type = MIPS_R_REFHI;
 480       break;
 481     case BFD_RELOC_LO16:
 482       mips_type = MIPS_R_REFLO;
 483       break;
 484     case BFD_RELOC_GPREL16:
 485       mips_type = MIPS_R_GPREL;
 486       break;
 487     case BFD_RELOC_MIPS_LITERAL:
 488       mips_type = MIPS_R_LITERAL;
 489       break;
 490     case BFD_RELOC_RVA:
 491       mips_type = MIPS_R_RVA;
 492       break;
 493     default:
 494       return NULL;
 495     }
 496
 497   return & howto_table [mips_type];
 498 }
 499
 500 static reloc_howto_type *
 501 coff_mips_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
 502                              const char *r_name)
 503 {
 504   unsigned int i;
 505
 506   for (i = 0;
 507        i < sizeof (howto_table) / sizeof (howto_table[0]);
 508        i++)
 509     if (howto_table[i].name != NULL
 510         && strcasecmp (howto_table[i].name, r_name) == 0)
 511       return &howto_table[i];
 512
 513   return NULL;
 514 }
 515
 516 static void
 517 mips_swap_reloc_in (bfd * abfd, void * src, void * dst)
 518 {
 519   static struct internal_reloc pair_prev;
 520   RELOC *reloc_src = (RELOC *) src;
 521   struct internal_reloc *reloc_dst = (struct internal_reloc *) dst;
 522
 523   reloc_dst->r_vaddr = H_GET_32 (abfd, reloc_src->r_vaddr);
 524   reloc_dst->r_symndx = H_GET_S32 (abfd, reloc_src->r_symndx);
 525   reloc_dst->r_type = H_GET_16 (abfd, reloc_src->r_type);
 526   reloc_dst->r_size = 0;
 527   reloc_dst->r_extern = 0;
 528   reloc_dst->r_offset = 0;
 529
 530   switch (reloc_dst->r_type)
 531   {
 532   case MIPS_R_REFHI:
 533     pair_prev = *reloc_dst;
 534     break;
 535   case MIPS_R_PAIR:
 536     reloc_dst->r_offset = reloc_dst->r_symndx;
 537     if (reloc_dst->r_offset & 0x8000)
 538       reloc_dst->r_offset -= 0x10000;
 539     reloc_dst->r_symndx = pair_prev.r_symndx;
 540     break;
 541   }
 542 }
 543
 544 static unsigned int
 545 mips_swap_reloc_out (bfd * abfd, void * src, void * dst)
 546 {
 547   static int prev_offset = 1;
 548   static bfd_vma prev_addr = 0;
 549   struct internal_reloc *reloc_src = (struct internal_reloc *)src;
 550   struct external_reloc *reloc_dst = (struct external_reloc *)dst;
 551
 552   switch (reloc_src->r_type)
 553     {
 554     case MIPS_R_REFHI:
 555       prev_addr = reloc_src->r_vaddr;
 556       prev_offset = reloc_src->r_offset;
 557       break;
 558     case MIPS_R_REFLO:
 559       if (reloc_src->r_vaddr == prev_addr)
 560         {
 561           /* FIXME: only slightly hackish.  If we see a REFLO pointing to
 562              the same address as a REFHI, we assume this is the matching
 563              PAIR reloc and output it accordingly.  The symndx is really
 564              the low 16 bits of the addend */
 565           H_PUT_32 (abfd, reloc_src->r_vaddr, reloc_dst->r_vaddr);
 566           H_PUT_32 (abfd, reloc_src->r_symndx, reloc_dst->r_symndx);
 567           H_PUT_16 (abfd, MIPS_R_PAIR, reloc_dst->r_type);
 568           return RELSZ;
 569         }
 570       break;
 571     }
 572
 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
 576   H_PUT_16 (abfd, reloc_src->r_type, reloc_dst->r_type);
 577   return RELSZ;
 578 }
 579
 580 #define coff_swap_reloc_in   mips_swap_reloc_in
 581 #define coff_swap_reloc_out  mips_swap_reloc_out
 582 #define NO_COFF_RELOCS
 583
 584 static bfd_boolean
 585 coff_pe_mips_relocate_section (bfd *output_bfd,
 586                                struct bfd_link_info *info,
 587                                bfd *input_bfd,
 588                                asection *input_section,
 589                                bfd_byte *contents,
 590                                struct internal_reloc *relocs,
 591                                struct internal_syment *syms,
 592                                asection **sections)
 593 {
 594   bfd_vma gp;
 595   bfd_boolean gp_undefined;
 596   size_t adjust;
 597   struct internal_reloc *rel;
 598   struct internal_reloc *rel_end;
 599   unsigned int i;
 600   bfd_boolean got_lo;
 601
 602   if (info->relocatable)
 603     {
 604       (*_bfd_error_handler)
 605         (_("%B: `ld -r' not supported with PE MIPS objects\n"), input_bfd);
 606       bfd_set_error (bfd_error_bad_value);
 607       return FALSE;
 608     }
 609
 610   BFD_ASSERT (input_bfd->xvec->byteorder
 611               == output_bfd->xvec->byteorder);
 612
 613   gp = _bfd_get_gp_value (output_bfd);
 614   gp_undefined = (gp == 0) ? TRUE : FALSE;
 615   got_lo = FALSE;
 616   adjust = 0;
 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 (info->relocatable)
 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 (! info->relocatable)
 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 #include "coffcode.h"
 854
 855 const bfd_target
 856 #ifdef TARGET_SYM
 857   TARGET_SYM =
 858 #else
 859   mipslpe_vec =
 860 #endif
 861 {
 862 #ifdef TARGET_NAME
 863   TARGET_NAME,
 864 #else
 865   "pe-mips",                    /* Name.  */
 866 #endif
 867   bfd_target_coff_flavour,
 868   BFD_ENDIAN_LITTLE,            /* Data byte order is little.  */
 869   BFD_ENDIAN_LITTLE,            /* Header byte order is little.  */
 870
 871   (HAS_RELOC | EXEC_P |         /* Object flags.  */
 872    HAS_LINENO | HAS_DEBUG |
 873    HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
 874
 875 #ifndef COFF_WITH_PE
 876   (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC /* Section flags.  */
 877    | SEC_CODE | SEC_DATA),
 878 #else
 879   (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC /* Section flags.  */
 880    | SEC_CODE | SEC_DATA
 881    | SEC_LINK_ONCE | SEC_LINK_DUPLICATES),
 882 #endif
 883
 884 #ifdef TARGET_UNDERSCORE
 885   TARGET_UNDERSCORE,            /* Leading underscore.  */
 886 #else
 887   0,                            /* leading underscore */
 888 #endif
 889   '/',                          /* AR_pad_char.  */
 890   15,                           /* AR_max_namelen.  */
 891
 892   bfd_getl64, bfd_getl_signed_64, bfd_putl64,
 893      bfd_getl32, bfd_getl_signed_32, bfd_putl32,
 894      bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* Data.  */
 895   bfd_getl64, bfd_getl_signed_64, bfd_putl64,
 896      bfd_getl32, bfd_getl_signed_32, bfd_putl32,
 897      bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* Headers.  */
 898
 899   /* Note that we allow an object file to be treated as a core file as well.  */
 900   {_bfd_dummy_target, coff_object_p, /* bfd_check_format.  */
 901    bfd_generic_archive_p, coff_object_p},
 902   {bfd_false, coff_mkobject, _bfd_generic_mkarchive, /* bfd_set_format.  */
 903    bfd_false},
 904   {bfd_false, coff_write_object_contents, /* bfd_write_contents.  */
 905    _bfd_write_archive_contents, bfd_false},
 906
 907   BFD_JUMP_TABLE_GENERIC (coff),
 908   BFD_JUMP_TABLE_COPY (coff),
 909   BFD_JUMP_TABLE_CORE (_bfd_nocore),
 910   BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_coff),
 911   BFD_JUMP_TABLE_SYMBOLS (coff),
 912   BFD_JUMP_TABLE_RELOCS (coff),
 913   BFD_JUMP_TABLE_WRITE (coff),
 914   BFD_JUMP_TABLE_LINK (coff),
 915   BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
 916
 917   NULL,
 918
 919   COFF_SWAP_TABLE
 920 };