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 != NULL
 100       && bfd_is_und_section (symbol_in->section))
 101   {
 102     /* Keep the state machine happy in case we're called again */
 103     if (r_type == R_IHIHALF)
 104     {
 105       part1_consth_active = true;
 106       part1_consth_value  = 0;
 107     }
 108     return(bfd_reloc_undefined);
 109   }
 110
 111   if ((part1_consth_active) && (r_type != R_IHCONST))
 112   {
 113     part1_consth_active = false;
 114     *error_message = (char *) "Missing IHCONST";
 115     return(bfd_reloc_dangerous);
 116   }
 117
 118
 119   sym_value = get_symbol_value(symbol_in);
 120
 121   switch (r_type)
 122   {
 123    case R_IREL:
 124     insn = bfd_get_32(abfd, hit_data);
 125     /* Take the value in the field and sign extend it */
 126     signed_value = EXTRACT_HWORD(insn);
 127     signed_value = SIGN_EXTEND_HWORD(signed_value);
 128     signed_value <<= 2;
 129     signed_value +=  sym_value + reloc_entry->addend;
 130     if (((signed_value + reloc_entry->address) & ~0x3ffff) == 0)
 131     {                           /* Absolute jmp/call */
 132       insn |= (1<<24);          /* Make it absolute */
 133       signed_value += reloc_entry->address;
 134       /* FIXME: Should we change r_type to R_IABS */
 135     }
 136     else
 137     {
 138       /* Relative jmp/call, so subtract from the value the
 139          address of the place we're coming from */
 140       signed_value -= (input_section->output_section->vma
 141                        + input_section->output_offset);
 142       if (signed_value>0x1ffff || signed_value<-0x20000)
 143        return(bfd_reloc_overflow);
 144     }
 145     signed_value >>= 2;
 146     insn = INSERT_HWORD(insn, signed_value);
 147     bfd_put_32(abfd, insn ,hit_data);
 148     break;
 149    case R_ILOHALF:
 150     insn = bfd_get_32(abfd, hit_data);
 151     unsigned_value = EXTRACT_HWORD(insn);
 152     unsigned_value +=  sym_value + reloc_entry->addend;
 153     insn = INSERT_HWORD(insn, unsigned_value);
 154     bfd_put_32(abfd, insn, hit_data);
 155     break;
 156    case R_IHIHALF:
 157     insn = bfd_get_32(abfd, hit_data);
 158     /* consth, part 1
 159        Just get the symbol value that is referenced */
 160     part1_consth_active = true;
 161     part1_consth_value = sym_value + reloc_entry->addend;
 162     /* Don't modify insn until R_IHCONST */
 163     break;
 164    case R_IHCONST:
 165     insn = bfd_get_32(abfd, hit_data);
 166     /* consth, part 2
 167        Now relocate the reference */
 168     if (part1_consth_active == false) {
 169       *error_message = (char *) "Missing IHIHALF";
 170       return(bfd_reloc_dangerous);
 171     }
 172     /* sym_ptr_ptr = r_symndx, in coff_slurp_reloc_table() */
 173     unsigned_value = 0;         /*EXTRACT_HWORD(insn) << 16;*/
 174     unsigned_value += reloc_entry->addend; /* r_symndx */
 175     unsigned_value += part1_consth_value;
 176     unsigned_value = unsigned_value >> 16;
 177     insn = INSERT_HWORD(insn, unsigned_value);
 178     part1_consth_active = false;
 179     bfd_put_32(abfd, insn, hit_data);
 180     break;
 181    case R_BYTE:
 182     insn = bfd_get_8(abfd, hit_data);
 183     unsigned_value = insn + sym_value + reloc_entry->addend;
 184     if (unsigned_value & 0xffffff00) {
 185       fprintf(stderr,"Relocation problem : ");
 186       fprintf(stderr,"byte value too large in module %s\n",
 187               abfd->filename);
 188       return(bfd_reloc_overflow);
 189     }
 190     bfd_put_8(abfd, unsigned_value, hit_data);
 191     break;
 192    case R_HWORD:
 193     insn = bfd_get_16(abfd, hit_data);
 194     unsigned_value = insn + sym_value + reloc_entry->addend;
 195     if (unsigned_value & 0xffff0000) {
 196       fprintf(stderr,"Relocation problem : ");
 197       fprintf(stderr,"hword value too large in module %s\n",
 198               abfd->filename);
 199       return(bfd_reloc_overflow);
 200     }
 201
 202     bfd_put_16(abfd, insn, hit_data);
 203     break;
 204    case R_WORD:
 205     insn = bfd_get_32(abfd, hit_data);
 206     insn += sym_value + reloc_entry->addend;
 207     bfd_put_32(abfd, insn, hit_data);
 208     break;
 209    default:
 210     *error_message = "Unrecognized reloc";
 211     return (bfd_reloc_dangerous);
 212   }
 213
 214
 215   return(bfd_reloc_ok);
 216 }
 217
 218 /*      type       rightshift
 219                        size
 220                           bitsize
 221                                pc-relative
 222                                      bitpos
 223                                          absolute
 224                                              complain_on_overflow
 225                                                   special_function
 226                                                     relocation name
 227                                                                partial_inplace
 228                                                                       src_mask
 229 */
 230
 231 /*FIXME: I'm not real sure about this table */
 232 static reloc_howto_type howto_table[] =
 233 {
 234   {R_ABS,     0, 3, 32, false, 0, complain_overflow_bitfield,a29k_reloc,"ABS",     true, 0xffffffff,0xffffffff, false},
 235   {1},  {2},  {3},   {4},  {5},  {6},  {7},  {8},  {9}, {10},
 236   {11}, {12}, {13}, {14}, {15}, {16}, {17}, {18}, {19}, {20},
 237   {21}, {22}, {23},
 238   {R_IREL,    0, 3, 32, true,  0, complain_overflow_signed,a29k_reloc,"IREL",    true, 0xffffffff,0xffffffff, false},
 239   {R_IABS,    0, 3, 32, false, 0, complain_overflow_bitfield, a29k_reloc,"IABS",    true, 0xffffffff,0xffffffff, false},
 240   {R_ILOHALF, 0, 3, 16, true,  0, complain_overflow_signed, a29k_reloc,"ILOHALF", true, 0x0000ffff,0x0000ffff, false},
 241   {R_IHIHALF, 0, 3, 16, true,  16, complain_overflow_signed, a29k_reloc,"IHIHALF", true, 0xffff0000,0xffff0000, false},
 242   {R_IHCONST, 0, 3, 16, true,  0, complain_overflow_signed, a29k_reloc,"IHCONST", true, 0xffff0000,0xffff0000, false},
 243   {R_BYTE,    0, 0, 8, false, 0, complain_overflow_bitfield, a29k_reloc,"BYTE",    true, 0x000000ff,0x000000ff, false},
 244   {R_HWORD,   0, 1, 16, false, 0, complain_overflow_bitfield, a29k_reloc,"HWORD",   true, 0x0000ffff,0x0000ffff, false},
 245   {R_WORD,    0, 2, 32, false, 0, complain_overflow_bitfield, a29k_reloc,"WORD",    true, 0xffffffff,0xffffffff, false},
 246 };
 247
 248 #define BADMAG(x) A29KBADMAG(x)
 249
 250 #define RELOC_PROCESSING(relent, reloc, symbols, abfd, section) \
 251  reloc_processing(relent, reloc, symbols, abfd, section)
 252
 253 static void
 254 reloc_processing (relent,reloc, symbols, abfd, section)
 255      arelent *relent;
 256      struct internal_reloc *reloc;
 257      asymbol **symbols;
 258      bfd *abfd;
 259      asection *section;
 260 {
 261     static bfd_vma ihihalf_vaddr = (bfd_vma) -1;
 262
 263     relent->address = reloc->r_vaddr;
 264     relent->howto = howto_table + reloc->r_type;
 265     if (reloc->r_type == R_IHCONST)
 266     {
 267       /* The address of an R_IHCONST should always be the address of
 268          the immediately preceding R_IHIHALF.  relocs generated by gas
 269          are correct, but relocs generated by High C are different (I
 270          can't figure out what the address means for High C).  We can
 271          handle both gas and High C by ignoring the address here, and
 272          simply reusing the address saved for R_IHIHALF.  */
 273         if (ihihalf_vaddr == (bfd_vma) -1)
 274           abort ();
 275         relent->address = ihihalf_vaddr;
 276         ihihalf_vaddr = (bfd_vma) -1;
 277         relent->addend = reloc->r_symndx;
 278         relent->sym_ptr_ptr= bfd_abs_section_ptr->symbol_ptr_ptr;
 279     }
 280     else
 281     {
 282       asymbol *ptr;
 283       relent->sym_ptr_ptr = symbols + obj_convert(abfd)[reloc->r_symndx];
 284
 285       ptr = *(relent->sym_ptr_ptr);
 286
 287       if (ptr
 288           && bfd_asymbol_bfd(ptr) == abfd
 289
 290           && ((ptr->flags & BSF_OLD_COMMON)== 0))
 291       {
 292           relent->addend = 0;
 293       }
 294       else
 295       {
 296           relent->addend = 0;
 297       }
 298       relent->address-= section->vma;
 299       if (reloc->r_type == R_IHIHALF)
 300         ihihalf_vaddr = relent->address;
 301       else if (ihihalf_vaddr != (bfd_vma) -1)
 302         abort ();
 303   }
 304 }
 305
 306 #include "coffcode.h"
 307
 308 const bfd_target a29kcoff_big_vec =
 309 {
 310   "coff-a29k-big",              /* name */
 311   bfd_target_coff_flavour,
 312   true,                         /* data byte order is big */
 313   true,                         /* header byte order is big */
 314
 315   (HAS_RELOC | EXEC_P |         /* object flags */
 316    HAS_LINENO | HAS_DEBUG |
 317    HAS_SYMS | HAS_LOCALS | WP_TEXT),
 318
 319   (SEC_HAS_CONTENTS | SEC_ALLOC /* section flags */
 320    | SEC_LOAD | SEC_RELOC
 321    | SEC_READONLY ),
 322   '_',                          /* leading underscore */
 323   '/',                          /* ar_pad_char */
 324   15,                           /* ar_max_namelen */
 325   2,                            /* minimum section alignment */
 326   /* data */
 327   bfd_getb64, bfd_getb_signed_64, bfd_putb64,
 328      bfd_getb32, bfd_getb_signed_32,   bfd_putb32,
 329      bfd_getb16, bfd_getb_signed_16, bfd_putb16,
 330   /* hdrs */
 331   bfd_getb64, bfd_getb_signed_64, bfd_putb64,
 332      bfd_getb32, bfd_getb_signed_32,   bfd_putb32,
 333      bfd_getb16, bfd_getb_signed_16, bfd_putb16,
 334
 335  {
 336
 337    _bfd_dummy_target,
 338    coff_object_p,
 339    bfd_generic_archive_p,
 340    _bfd_dummy_target
 341   },
 342  {
 343    bfd_false,
 344    coff_mkobject,
 345    _bfd_generic_mkarchive,
 346    bfd_false
 347   },
 348  {
 349    bfd_false,
 350    coff_write_object_contents,
 351    _bfd_write_archive_contents,
 352    bfd_false
 353   },
 354
 355      BFD_JUMP_TABLE_GENERIC (coff),
 356      BFD_JUMP_TABLE_COPY (coff),
 357      BFD_JUMP_TABLE_CORE (_bfd_nocore),
 358      BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_coff),
 359      BFD_JUMP_TABLE_SYMBOLS (coff),
 360      BFD_JUMP_TABLE_RELOCS (coff),
 361      BFD_JUMP_TABLE_WRITE (coff),
 362      BFD_JUMP_TABLE_LINK (coff),
 363      BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
 364
 365   COFF_SWAP_TABLE
 366  };