bfd/coff-a29k.c

   1 /* AMD 29000 COFF back-end for BFD.
   2    Copyright (C) 1990-1991 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 /* $Id$ */
  22
  23 #define A29K 1
  24
  25 #include "bfd.h"
  26 #include "sysdep.h"
  27 #include "libbfd.h"
  28 #include "obstack.h"
  29 #include "coff/a29k.h"
  30 #include "coff/internal.h"
  31 #include "libcoff.h"
  32
  33 #define INSERT_HWORD(WORD,HWORD)        \
  34     (((WORD) & 0xff00ff00) | (((HWORD) & 0xff00) << 8) | ((HWORD)& 0xff))
  35 #define EXTRACT_HWORD(WORD) \
  36     (((WORD) & 0x00ff0000) >> 8) | ((WORD)& 0xff)
  37 #define SIGN_EXTEND_HWORD(HWORD) \
  38     ((HWORD) & 0x8000 ? (HWORD)|0xffff0000 : (HWORD))
  39
  40 /* Provided the symbol, returns the value reffed */
  41 static  long
  42 get_symbol_value(symbol)
  43 asymbol *symbol;
  44 {
  45   long relocation = 0;
  46
  47   if (symbol->section == &bfd_com_section)
  48   {
  49     relocation = 0;
  50   }
  51   else
  52   {
  53     relocation = symbol->value +
  54      symbol->section->output_section->vma +
  55       symbol->section->output_offset;
  56   }
  57
  58   return(relocation);
  59 }
  60
  61 /* this function is in charge of performing all the 29k relocations */
  62
  63 static bfd_reloc_status_type
  64 DEFUN(a29k_reloc,(abfd, reloc_entry, symbol_in, data, input_section, output_bfd),
  65       bfd *abfd AND
  66       arelent *reloc_entry AND
  67       asymbol *symbol_in AND
  68       PTR data AND
  69       asection *input_section AND
  70       bfd *output_bfd)
  71 {
  72   /* the consth relocation comes in two parts, we have to remember
  73      the state between calls, in these variables */
  74   static boolean part1_consth_active = false;
  75   static unsigned long part1_consth_value;
  76
  77   unsigned long insn;
  78   unsigned long sym_value;
  79   unsigned long unsigned_value;
  80   unsigned short r_type;
  81   long signed_value;
  82
  83   unsigned long addr = reloc_entry->address ; /*+ input_section->vma*/
  84   bfd_byte  *hit_data =addr + (bfd_byte *)(data);
  85
  86   r_type = reloc_entry->howto->type;
  87
  88   if (output_bfd) {
  89     /* Partial linking - do nothing */
  90     reloc_entry->address += input_section->output_offset;
  91     return bfd_reloc_ok;
  92
  93   }
  94
  95   if (symbol_in && (symbol_in->section == &bfd_und_section))
  96   {
  97     /* Keep the state machine happy in case we're called again */
  98     if (r_type == R_IHIHALF)
  99     {
 100       part1_consth_active = true;
 101       part1_consth_value  = 0;
 102     }
 103     return(bfd_reloc_undefined);
 104   }
 105
 106   if ((part1_consth_active) && (r_type != R_IHCONST))
 107   {
 108     fprintf(stderr,"Relocation problem : ");
 109     fprintf(stderr,"Missing IHCONST in module %s\n",abfd->filename);
 110     part1_consth_active = false;
 111     return(bfd_reloc_dangerous);
 112   }
 113
 114
 115   sym_value = get_symbol_value(symbol_in);
 116
 117   switch (r_type)
 118   {
 119    case R_IREL:
 120     insn = bfd_get_32(abfd, hit_data);
 121     /* Take the value in the field and sign extend it */
 122     signed_value = EXTRACT_HWORD(insn) << 2;
 123     signed_value = SIGN_EXTEND_HWORD(signed_value);
 124     signed_value +=  sym_value + reloc_entry->addend;
 125     if ((signed_value&~0x3ffff) == 0)
 126     {                           /* Absolute jmp/call */
 127       insn |= (1<<24);          /* Make it absolute */
 128       /* FIXME: Should we change r_type to R_IABS */
 129       signed_value /= 2;
 130     }
 131     else
 132     {
 133       /* Relative jmp/call, so subtract from the value the
 134          address of the place we're coming from */
 135       signed_value -= reloc_entry->address +
 136        input_section->output_section->vma +
 137         input_section->output_offset;
 138       if (signed_value>0x1ffff || signed_value<-0x20000)
 139        return(bfd_reloc_outofrange);
 140
 141       signed_value /= 2;
 142     }
 143     insn = INSERT_HWORD(insn, signed_value);
 144     bfd_put_32(abfd, insn ,hit_data);
 145     break;
 146    case R_ILOHALF:
 147     insn = bfd_get_32(abfd, hit_data);
 148     unsigned_value = EXTRACT_HWORD(insn);
 149     unsigned_value +=  sym_value + reloc_entry->addend;
 150     insn = INSERT_HWORD(insn, unsigned_value);
 151     bfd_put_32(abfd, insn, hit_data);
 152     break;
 153    case R_IHIHALF:
 154     insn = bfd_get_32(abfd, hit_data);
 155     /* consth, part 1
 156        Just get the symbol value that is referenced */
 157     part1_consth_active = true;
 158     part1_consth_value = sym_value + reloc_entry->addend;
 159     /* Don't modify insn until R_IHCONST */
 160     break;
 161    case R_IHCONST:
 162     insn = bfd_get_32(abfd, hit_data);
 163     /* consth, part 2
 164        Now relocate the reference */
 165     if (part1_consth_active == false) {
 166       fprintf(stderr,"Relocation problem : ");
 167       fprintf(stderr,"IHIHALF missing in module %s\n",
 168               abfd->filename);
 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, insn, 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     fprintf(stderr,"Relocation problem : ");
 210     fprintf(stderr,"Unrecognized reloc type %d, in module %s\n",
 211             r_type,abfd->filename);
 212     return (bfd_reloc_dangerous);
 213   }
 214
 215
 216   return(bfd_reloc_ok);
 217 }
 218
 219 /*      type       rightshift
 220                        size
 221                           bitsize
 222                                pc-relative
 223                                      bitpos
 224                                          absolute
 225                                              complain_on_overflow
 226                                                   special_function
 227                                                     relocation name
 228                                                                partial_inplace
 229                                                                       src_mask
 230 */
 231
 232 /*FIXME: I'm not real sure about this table */
 233 #define NA      0       /* Obsolete fields, via the documentation */
 234 #define NAB false
 235 static reloc_howto_type howto_table[] =
 236 {
 237   {R_ABS,     0, 3, NA, false, NA, NAB, true,a29k_reloc,"ABS",     true, 0xffffffff,0xffffffff, false},
 238   {1},  {2},  {3},   {4},  {5},  {6},  {7},  {8},  {9}, {10},
 239   {11}, {12}, {13}, {14}, {15}, {16}, {17}, {18}, {19}, {20},
 240   {21}, {22}, {23},
 241   {R_IREL,    0, 3, NA, true,  NA, NAB, true,a29k_reloc,"IREL",    true, 0xffffffff,0xffffffff, false},
 242   {R_IABS,    0, 3, NA, false, NA, NAB, true,a29k_reloc,"IABS",    true, 0xffffffff,0xffffffff, false},
 243   {R_ILOHALF, 0, 3, NA, true,  NA, NAB, true,a29k_reloc,"ILOHALF", true, 0x0000ffff,0x0000ffff, false},
 244   {R_IHIHALF, 0, 3, NA, true,  NA, NAB, true,a29k_reloc,"IHIHALF", true, 0xffff0000,0xffff0000, false},
 245   {R_IHCONST, 0, 3, NA, true,  NA, NAB, true,a29k_reloc,"IHCONST", true, 0xffff0000,0xffff0000, false},
 246   {R_BYTE,    0, 0, NA, false, NA, NAB, true,a29k_reloc,"BYTE",    true, 0x000000ff,0x000000ff, false},
 247   {R_HWORD,   0, 1, NA, false, NA, NAB, true,a29k_reloc,"HWORD",   true, 0x0000ffff,0x0000ffff, false},
 248   {R_WORD,    0, 2, NA, false, NA, NAB, true,a29k_reloc,"WORD",    true, 0xffffffff,0xffffffff, false},
 249 };
 250 #undef NA
 251
 252 #define BADMAG(x) A29KBADMAG(x)
 253
 254 #define RELOC_PROCESSING(relent, reloc, symbols, abfd, section) \
 255  reloc_processing(relent, reloc, symbols, abfd, section)
 256
 257 static void DEFUN(reloc_processing,(relent,reloc, symbols, abfd, section) ,
 258            arelent *relent AND
 259            struct internal_reloc *reloc AND
 260            asymbol **symbols AND
 261            bfd *abfd AND
 262            asection *section)
 263 {
 264     relent->address = reloc->r_vaddr;
 265     relent->howto = howto_table + reloc->r_type;
 266     if (reloc->r_type == R_IHCONST)
 267     {
 268         relent->addend = reloc->r_symndx;
 269         relent->sym_ptr_ptr= bfd_abs_section.symbol_ptr_ptr;
 270     }
 271     else
 272     {
 273       asymbol *ptr;
 274       relent->sym_ptr_ptr = symbols + obj_convert(abfd)[reloc->r_symndx];
 275
 276       ptr = *(relent->sym_ptr_ptr);
 277
 278       if (ptr
 279           && ptr->the_bfd == abfd
 280
 281           && ((ptr->flags & BSF_OLD_COMMON)== 0))
 282       {
 283           relent->addend = 0;
 284       }
 285       else
 286       {
 287           relent->addend = 0;
 288       }
 289       relent->address-= section->vma;
 290   }
 291 }
 292
 293 #include "coffcode.h"
 294
 295 bfd_target a29kcoff_big_vec =
 296 {
 297     "coff-a29k-big",            /* name */
 298     bfd_target_coff_flavour,
 299     true,                       /* data byte order is big */
 300     true,                       /* header byte order is big */
 301
 302     (HAS_RELOC | EXEC_P |       /* object flags */
 303      HAS_LINENO | HAS_DEBUG |
 304      HAS_SYMS | HAS_LOCALS | DYNAMIC | WP_TEXT),
 305
 306     (SEC_HAS_CONTENTS | SEC_ALLOC /* section flags */
 307      | SEC_LOAD | SEC_RELOC
 308      | SEC_READONLY ),
 309     '/',                        /* ar_pad_char */
 310     15,                         /* ar_max_namelen */
 311     2,                          /* minimum section alignment */
 312     /* data */
 313     _do_getb64, _do_putb64, _do_getb32,
 314     _do_putb32, _do_getb16, _do_putb16,
 315     /* hdrs */
 316     _do_getb64, _do_putb64, _do_getb32,
 317     _do_putb32, _do_getb16, _do_putb16,
 318
 319   {
 320
 321       _bfd_dummy_target,
 322       coff_object_p,
 323       bfd_generic_archive_p,
 324       _bfd_dummy_target
 325    },
 326   {
 327       bfd_false,
 328       coff_mkobject,
 329       _bfd_generic_mkarchive,
 330       bfd_false
 331    },
 332   {
 333       bfd_false,
 334       coff_write_object_contents,
 335       _bfd_write_archive_contents,
 336       bfd_false
 337    },
 338
 339     JUMP_TABLE(coff),
 340     COFF_SWAP_TABLE
 341  };
 342