bfd/coff-a29k.c

   1 /* BFD back-end for AMD 29000 COFF binaries.
   2    Copyright 1990, 1991, 1992, 1993, 1994 Free Software Foundation, Inc.
   3    Contributed by David Wood at New York University 7/8/91.
   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 2 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., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  20
  21 #define A29K 1
  22
  23 #include "bfd.h"
  24 #include "sysdep.h"
  25 #include "libbfd.h"
  26 #include "obstack.h"
  27 #include "coff/a29k.h"
  28 #include "coff/internal.h"
  29 #include "libcoff.h"
  30
  31 static long get_symbol_value PARAMS ((asymbol *));
  32 static bfd_reloc_status_type a29k_reloc
  33   PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
  34
  35 #define INSERT_HWORD(WORD,HWORD)        \
  36     (((WORD) & 0xff00ff00) | (((HWORD) & 0xff00) << 8) | ((HWORD)& 0xff))
  37 #define EXTRACT_HWORD(WORD) \
  38     (((WORD) & 0x00ff0000) >> 8) | ((WORD)& 0xff)
  39 #define SIGN_EXTEND_HWORD(HWORD) \
  40     ((HWORD) & 0x8000 ? (HWORD)|0xffff0000 : (HWORD))
  41
  42 /* Provided the symbol, returns the value reffed */
  43 static long
  44 get_symbol_value (symbol)
  45      asymbol *symbol;
  46 {
  47   long relocation = 0;
  48
  49   if (bfd_is_com_section (symbol->section))
  50   {
  51     relocation = 0;
  52   }
  53   else
  54   {
  55     relocation = symbol->value +
  56      symbol->section->output_section->vma +
  57       symbol->section->output_offset;
  58   }
  59
  60   return(relocation);
  61 }
  62
  63 /* this function is in charge of performing all the 29k relocations */
  64
  65 static bfd_reloc_status_type
  66 a29k_reloc (abfd, reloc_entry, symbol_in, data, input_section, output_bfd,
  67             error_message)
  68      bfd *abfd;
  69      arelent *reloc_entry;
  70      asymbol *symbol_in;
  71      PTR data;
  72      asection *input_section;
  73      bfd *output_bfd;
  74      char **error_message;
  75 {
  76   /* the consth relocation comes in two parts, we have to remember
  77      the state between calls, in these variables */
  78   static boolean part1_consth_active = false;
  79   static unsigned long part1_consth_value;
  80
  81   unsigned long insn;
  82   unsigned long sym_value;
  83   unsigned long unsigned_value;
  84   unsigned short r_type;
  85   long signed_value;
  86
  87   unsigned long addr = reloc_entry->address ; /*+ input_section->vma*/
  88   bfd_byte  *hit_data =addr + (bfd_byte *)(data);
  89
  90   r_type = reloc_entry->howto->type;
  91
  92   if (output_bfd) {
  93     /* Partial linking - do nothing */
  94     reloc_entry->address += input_section->output_offset;
  95     return bfd_reloc_ok;
  96
  97   }
  98
  99   if (symbol_in && (symbol_in->section == &bfd_und_section))
 100   {
 101     /* Keep the state machine happy in case we're called again */
 102     if (r_type == R_IHIHALF)
 103     {
 104       part1_consth_active = true;
 105       part1_consth_value  = 0;
 106     }
 107     return(bfd_reloc_undefined);
 108   }
 109
 110   if ((part1_consth_active) && (r_type != R_IHCONST))
 111   {
 112     part1_consth_active = false;
 113     *error_message = (char *) "Missing IHCONST";
 114     return(bfd_reloc_dangerous);
 115   }
 116
 117
 118   sym_value = get_symbol_value(symbol_in);
 119
 120   switch (r_type)
 121   {
 122    case R_IREL:
 123     insn = bfd_get_32(abfd, hit_data);
 124     /* Take the value in the field and sign extend it */
 125     signed_value = EXTRACT_HWORD(insn);
 126     signed_value = SIGN_EXTEND_HWORD(signed_value);
 127     signed_value <<= 2;
 128     signed_value +=  sym_value + reloc_entry->addend;
 129     if (((signed_value + reloc_entry->address) & ~0x3ffff) == 0)
 130     {                           /* Absolute jmp/call */
 131       insn |= (1<<24);          /* Make it absolute */
 132       signed_value += reloc_entry->address;
 133       /* FIXME: Should we change r_type to R_IABS */
 134     }
 135     else
 136     {
 137       /* Relative jmp/call, so subtract from the value the
 138          address of the place we're coming from */
 139       signed_value -= (input_section->output_section->vma
 140                        + input_section->output_offset);
 141       if (signed_value>0x1ffff || signed_value<-0x20000)
 142        return(bfd_reloc_overflow);
 143     }
 144     signed_value >>= 2;
 145     insn = INSERT_HWORD(insn, signed_value);
 146     bfd_put_32(abfd, insn ,hit_data);
 147     break;
 148    case R_ILOHALF:
 149     insn = bfd_get_32(abfd, hit_data);
 150     unsigned_value = EXTRACT_HWORD(insn);
 151     unsigned_value +=  sym_value + reloc_entry->addend;
 152     insn = INSERT_HWORD(insn, unsigned_value);
 153     bfd_put_32(abfd, insn, hit_data);
 154     break;
 155    case R_IHIHALF:
 156     insn = bfd_get_32(abfd, hit_data);
 157     /* consth, part 1
 158        Just get the symbol value that is referenced */
 159     part1_consth_active = true;
 160     part1_consth_value = sym_value + reloc_entry->addend;
 161     /* Don't modify insn until R_IHCONST */
 162     break;
 163    case R_IHCONST:
 164     insn = bfd_get_32(abfd, hit_data);
 165     /* consth, part 2
 166        Now relocate the reference */
 167     if (part1_consth_active == false) {
 168       *error_message = (char *) "Missing IHIHALF";
 169       return(bfd_reloc_dangerous);
 170     }
 171     /* sym_ptr_ptr = r_symndx, in coff_slurp_reloc_table() */
 172     unsigned_value = 0;         /*EXTRACT_HWORD(insn) << 16;*/
 173     unsigned_value += reloc_entry->addend; /* r_symndx */
 174     unsigned_value += part1_consth_value;
 175     unsigned_value = unsigned_value >> 16;
 176     insn = INSERT_HWORD(insn, unsigned_value);
 177     part1_consth_active = false;
 178     bfd_put_32(abfd, insn, hit_data);
 179     break;
 180    case R_BYTE:
 181     insn = bfd_get_8(abfd, hit_data);
 182     unsigned_value = insn + sym_value + reloc_entry->addend;
 183     if (unsigned_value & 0xffffff00) {
 184       fprintf(stderr,"Relocation problem : ");
 185       fprintf(stderr,"byte value too large in module %s\n",
 186               abfd->filename);
 187       return(bfd_reloc_overflow);
 188     }
 189     bfd_put_8(abfd, unsigned_value, hit_data);
 190     break;
 191    case R_HWORD:
 192     insn = bfd_get_16(abfd, hit_data);
 193     unsigned_value = insn + sym_value + reloc_entry->addend;
 194     if (unsigned_value & 0xffff0000) {
 195       fprintf(stderr,"Relocation problem : ");
 196       fprintf(stderr,"hword value too large in module %s\n",
 197               abfd->filename);
 198       return(bfd_reloc_overflow);
 199     }
 200
 201     bfd_put_16(abfd, insn, hit_data);
 202     break;
 203    case R_WORD:
 204     insn = bfd_get_32(abfd, hit_data);
 205     insn += sym_value + reloc_entry->addend;
 206     bfd_put_32(abfd, insn, hit_data);
 207     break;
 208    default:
 209     *error_message = "Unrecognized reloc";
 210     return (bfd_reloc_dangerous);
 211   }
 212
 213
 214   return(bfd_reloc_ok);
 215 }
 216
 217 /*      type       rightshift
 218                        size
 219                           bitsize
 220                                pc-relative
 221                                      bitpos
 222                                          absolute
 223                                              complain_on_overflow
 224                                                   special_function
 225                                                     relocation name
 226                                                                partial_inplace
 227                                                                       src_mask
 228 */
 229
 230 /*FIXME: I'm not real sure about this table */
 231 static reloc_howto_type howto_table[] =
 232 {
 233   {R_ABS,     0, 3, 32, false, 0, complain_overflow_bitfield,a29k_reloc,"ABS",     true, 0xffffffff,0xffffffff, false},
 234   {1},  {2},  {3},   {4},  {5},  {6},  {7},  {8},  {9}, {10},
 235   {11}, {12}, {13}, {14}, {15}, {16}, {17}, {18}, {19}, {20},
 236   {21}, {22}, {23},
 237   {R_IREL,    0, 3, 32, true,  0, complain_overflow_signed,a29k_reloc,"IREL",    true, 0xffffffff,0xffffffff, false},
 238   {R_IABS,    0, 3, 32, false, 0, complain_overflow_bitfield, a29k_reloc,"IABS",    true, 0xffffffff,0xffffffff, false},
 239   {R_ILOHALF, 0, 3, 16, true,  0, complain_overflow_signed, a29k_reloc,"ILOHALF", true, 0x0000ffff,0x0000ffff, false},
 240   {R_IHIHALF, 0, 3, 16, true,  16, complain_overflow_signed, a29k_reloc,"IHIHALF", true, 0xffff0000,0xffff0000, false},
 241   {R_IHCONST, 0, 3, 16, true,  0, complain_overflow_signed, a29k_reloc,"IHCONST", true, 0xffff0000,0xffff0000, false},
 242   {R_BYTE,    0, 0, 8, false, 0, complain_overflow_bitfield, a29k_reloc,"BYTE",    true, 0x000000ff,0x000000ff, false},
 243   {R_HWORD,   0, 1, 16, false, 0, complain_overflow_bitfield, a29k_reloc,"HWORD",   true, 0x0000ffff,0x0000ffff, false},
 244   {R_WORD,    0, 2, 32, false, 0, complain_overflow_bitfield, a29k_reloc,"WORD",    true, 0xffffffff,0xffffffff, false},
 245 };
 246
 247 #define BADMAG(x) A29KBADMAG(x)
 248
 249 #define RELOC_PROCESSING(relent, reloc, symbols, abfd, section) \
 250  reloc_processing(relent, reloc, symbols, abfd, section)
 251
 252 static void
 253 reloc_processing (relent,reloc, symbols, abfd, section)
 254      arelent *relent;
 255      struct internal_reloc *reloc;
 256      asymbol **symbols;
 257      bfd *abfd;
 258      asection *section;
 259 {
 260     static bfd_vma ihihalf_vaddr = (bfd_vma) -1;
 261
 262     relent->address = reloc->r_vaddr;
 263     relent->howto = howto_table + reloc->r_type;
 264     if (reloc->r_type == R_IHCONST)
 265     {
 266       /* The address of an R_IHCONST should always be the address of
 267          the immediately preceding R_IHIHALF.  relocs generated by gas
 268          are correct, but relocs generated by High C are different (I
 269          can't figure out what the address means for High C).  We can
 270          handle both gas and High C by ignoring the address here, and
 271          simply reusing the address saved for R_IHIHALF.  */
 272         if (ihihalf_vaddr == (bfd_vma) -1)
 273           abort ();
 274         relent->address = ihihalf_vaddr;
 275         ihihalf_vaddr = (bfd_vma) -1;
 276         relent->addend = reloc->r_symndx;
 277         relent->sym_ptr_ptr= bfd_abs_section.symbol_ptr_ptr;
 278     }
 279     else
 280     {
 281       asymbol *ptr;
 282       relent->sym_ptr_ptr = symbols + obj_convert(abfd)[reloc->r_symndx];
 283
 284       ptr = *(relent->sym_ptr_ptr);
 285
 286       if (ptr
 287           && bfd_asymbol_bfd(ptr) == abfd
 288
 289           && ((ptr->flags & BSF_OLD_COMMON)== 0))
 290       {
 291           relent->addend = 0;
 292       }
 293       else
 294       {
 295           relent->addend = 0;
 296       }
 297       relent->address-= section->vma;
 298       if (reloc->r_type == R_IHIHALF)
 299         ihihalf_vaddr = relent->address;
 300       else if (ihihalf_vaddr != (bfd_vma) -1)
 301         abort ();
 302   }
 303 }
 304
 305 #include "coffcode.h"
 306
 307 bfd_target a29kcoff_big_vec =
 308 {
 309   "coff-a29k-big",              /* name */
 310   bfd_target_coff_flavour,
 311   true,                         /* data byte order is big */
 312   true,                         /* header byte order is big */
 313
 314   (HAS_RELOC | EXEC_P |         /* object flags */
 315    HAS_LINENO | HAS_DEBUG |
 316    HAS_SYMS | HAS_LOCALS | WP_TEXT),
 317
 318   (SEC_HAS_CONTENTS | SEC_ALLOC /* section flags */
 319    | SEC_LOAD | SEC_RELOC
 320    | SEC_READONLY ),
 321   '_',                          /* leading underscore */
 322   '/',                          /* ar_pad_char */
 323   15,                           /* ar_max_namelen */
 324   2,                            /* minimum section alignment */
 325   /* data */
 326   bfd_getb64, bfd_getb_signed_64, bfd_putb64,
 327      bfd_getb32, bfd_getb_signed_32,   bfd_putb32,
 328      bfd_getb16, bfd_getb_signed_16, bfd_putb16,
 329   /* hdrs */
 330   bfd_getb64, bfd_getb_signed_64, bfd_putb64,
 331      bfd_getb32, bfd_getb_signed_32,   bfd_putb32,
 332      bfd_getb16, bfd_getb_signed_16, bfd_putb16,
 333
 334  {
 335
 336    _bfd_dummy_target,
 337    coff_object_p,
 338    bfd_generic_archive_p,
 339    _bfd_dummy_target
 340   },
 341  {
 342    bfd_false,
 343    coff_mkobject,
 344    _bfd_generic_mkarchive,
 345    bfd_false
 346   },
 347  {
 348    bfd_false,
 349    coff_write_object_contents,
 350    _bfd_write_archive_contents,
 351    bfd_false
 352   },
 353
 354      BFD_JUMP_TABLE_GENERIC (coff),
 355      BFD_JUMP_TABLE_COPY (coff),
 356      BFD_JUMP_TABLE_CORE (_bfd_nocore),
 357      BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_coff),
 358      BFD_JUMP_TABLE_SYMBOLS (coff),
 359      BFD_JUMP_TABLE_RELOCS (coff),
 360      BFD_JUMP_TABLE_WRITE (coff),
 361      BFD_JUMP_TABLE_LINK (coff),
 362      BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
 363
 364   COFF_SWAP_TABLE
 365  };