bfd/coff-a29k.c

   1 /* BFD back-end for AMD 29000 COFF binaries.
   2    Copyright 1990, 1991, 1992, 1993 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 #define INSERT_HWORD(WORD,HWORD)        \
  32     (((WORD) & 0xff00ff00) | (((HWORD) & 0xff00) << 8) | ((HWORD)& 0xff))
  33 #define EXTRACT_HWORD(WORD) \
  34     (((WORD) & 0x00ff0000) >> 8) | ((WORD)& 0xff)
  35 #define SIGN_EXTEND_HWORD(HWORD) \
  36     ((HWORD) & 0x8000 ? (HWORD)|0xffff0000 : (HWORD))
  37
  38 /* Provided the symbol, returns the value reffed */
  39 static  long
  40 get_symbol_value(symbol)
  41 asymbol *symbol;
  42 {
  43   long relocation = 0;
  44
  45   if (bfd_is_com_section (symbol->section))
  46   {
  47     relocation = 0;
  48   }
  49   else
  50   {
  51     relocation = symbol->value +
  52      symbol->section->output_section->vma +
  53       symbol->section->output_offset;
  54   }
  55
  56   return(relocation);
  57 }
  58
  59 /* this function is in charge of performing all the 29k relocations */
  60
  61 static bfd_reloc_status_type
  62 DEFUN(a29k_reloc,(abfd, reloc_entry, symbol_in, data, input_section, output_bfd),
  63       bfd *abfd AND
  64       arelent *reloc_entry AND
  65       asymbol *symbol_in AND
  66       PTR data AND
  67       asection *input_section AND
  68       bfd *output_bfd)
  69 {
  70   /* the consth relocation comes in two parts, we have to remember
  71      the state between calls, in these variables */
  72   static boolean part1_consth_active = false;
  73   static unsigned long part1_consth_value;
  74
  75   unsigned long insn;
  76   unsigned long sym_value;
  77   unsigned long unsigned_value;
  78   unsigned short r_type;
  79   long signed_value;
  80
  81   unsigned long addr = reloc_entry->address ; /*+ input_section->vma*/
  82   bfd_byte  *hit_data =addr + (bfd_byte *)(data);
  83
  84   r_type = reloc_entry->howto->type;
  85
  86   if (output_bfd) {
  87     /* Partial linking - do nothing */
  88     reloc_entry->address += input_section->output_offset;
  89     return bfd_reloc_ok;
  90
  91   }
  92
  93   if (symbol_in && (symbol_in->section == &bfd_und_section))
  94   {
  95     /* Keep the state machine happy in case we're called again */
  96     if (r_type == R_IHIHALF)
  97     {
  98       part1_consth_active = true;
  99       part1_consth_value  = 0;
 100     }
 101     return(bfd_reloc_undefined);
 102   }
 103
 104   if ((part1_consth_active) && (r_type != R_IHCONST))
 105   {
 106     fprintf(stderr,"Relocation problem : ");
 107     fprintf(stderr,"Missing IHCONST in module %s\n",abfd->filename);
 108     part1_consth_active = false;
 109     return(bfd_reloc_dangerous);
 110   }
 111
 112
 113   sym_value = get_symbol_value(symbol_in);
 114
 115   switch (r_type)
 116   {
 117    case R_IREL:
 118     insn = bfd_get_32(abfd, hit_data);
 119     /* Take the value in the field and sign extend it */
 120     signed_value = EXTRACT_HWORD(insn) << 2;
 121     signed_value = SIGN_EXTEND_HWORD(signed_value);
 122     signed_value +=  sym_value + reloc_entry->addend;
 123     if ((signed_value&~0x3ffff) == 0)
 124     {                           /* Absolute jmp/call */
 125       insn |= (1<<24);          /* Make it absolute */
 126       /* FIXME: Should we change r_type to R_IABS */
 127     }
 128     else
 129     {
 130       /* Relative jmp/call, so subtract from the value the
 131          address of the place we're coming from */
 132       signed_value -= reloc_entry->address +
 133        input_section->output_section->vma +
 134         input_section->output_offset;
 135       if (signed_value>0x1ffff || signed_value<-0x20000)
 136        return(bfd_reloc_outofrange);
 137     }
 138     signed_value >>= 2;
 139     insn = INSERT_HWORD(insn, signed_value);
 140     bfd_put_32(abfd, insn ,hit_data);
 141     break;
 142    case R_ILOHALF:
 143     insn = bfd_get_32(abfd, hit_data);
 144     unsigned_value = EXTRACT_HWORD(insn);
 145     unsigned_value +=  sym_value + reloc_entry->addend;
 146     insn = INSERT_HWORD(insn, unsigned_value);
 147     bfd_put_32(abfd, insn, hit_data);
 148     break;
 149    case R_IHIHALF:
 150     insn = bfd_get_32(abfd, hit_data);
 151     /* consth, part 1
 152        Just get the symbol value that is referenced */
 153     part1_consth_active = true;
 154     part1_consth_value = sym_value + reloc_entry->addend;
 155     /* Don't modify insn until R_IHCONST */
 156     break;
 157    case R_IHCONST:
 158     insn = bfd_get_32(abfd, hit_data);
 159     /* consth, part 2
 160        Now relocate the reference */
 161     if (part1_consth_active == false) {
 162       fprintf(stderr,"Relocation problem : ");
 163       fprintf(stderr,"IHIHALF missing in module %s\n",
 164               abfd->filename);
 165       return(bfd_reloc_dangerous);
 166     }
 167     /* sym_ptr_ptr = r_symndx, in coff_slurp_reloc_table() */
 168     unsigned_value = 0;         /*EXTRACT_HWORD(insn) << 16;*/
 169     unsigned_value += reloc_entry->addend; /* r_symndx */
 170     unsigned_value += part1_consth_value;
 171     unsigned_value = unsigned_value >> 16;
 172     insn = INSERT_HWORD(insn, unsigned_value);
 173     part1_consth_active = false;
 174     bfd_put_32(abfd, insn, hit_data);
 175     break;
 176    case R_BYTE:
 177     insn = bfd_get_8(abfd, hit_data);
 178     unsigned_value = insn + sym_value + reloc_entry->addend;
 179     if (unsigned_value & 0xffffff00) {
 180       fprintf(stderr,"Relocation problem : ");
 181       fprintf(stderr,"byte value too large in module %s\n",
 182               abfd->filename);
 183       return(bfd_reloc_overflow);
 184     }
 185     bfd_put_8(abfd, unsigned_value, hit_data);
 186     break;
 187    case R_HWORD:
 188     insn = bfd_get_16(abfd, hit_data);
 189     unsigned_value = insn + sym_value + reloc_entry->addend;
 190     if (unsigned_value & 0xffff0000) {
 191       fprintf(stderr,"Relocation problem : ");
 192       fprintf(stderr,"hword value too large in module %s\n",
 193               abfd->filename);
 194       return(bfd_reloc_overflow);
 195     }
 196
 197     bfd_put_16(abfd, insn, hit_data);
 198     break;
 199    case R_WORD:
 200     insn = bfd_get_32(abfd, hit_data);
 201     insn += sym_value + reloc_entry->addend;
 202     bfd_put_32(abfd, insn, hit_data);
 203     break;
 204    default:
 205     fprintf(stderr,"Relocation problem : ");
 206     fprintf(stderr,"Unrecognized reloc type %d, in module %s\n",
 207             r_type,abfd->filename);
 208     return (bfd_reloc_dangerous);
 209   }
 210
 211
 212   return(bfd_reloc_ok);
 213 }
 214
 215 /*      type       rightshift
 216                        size
 217                           bitsize
 218                                pc-relative
 219                                      bitpos
 220                                          absolute
 221                                              complain_on_overflow
 222                                                   special_function
 223                                                     relocation name
 224                                                                partial_inplace
 225                                                                       src_mask
 226 */
 227
 228 /*FIXME: I'm not real sure about this table */
 229 #define NA      0       /* Obsolete fields, via the documentation */
 230 #define NAB false
 231 static reloc_howto_type howto_table[] =
 232 {
 233   {R_ABS,     0, 3, NA, false, NA, NAB, true,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, NA, true,  NA, NAB, true,a29k_reloc,"IREL",    true, 0xffffffff,0xffffffff, false},
 238   {R_IABS,    0, 3, NA, false, NA, NAB, true,a29k_reloc,"IABS",    true, 0xffffffff,0xffffffff, false},
 239   {R_ILOHALF, 0, 3, NA, true,  NA, NAB, true,a29k_reloc,"ILOHALF", true, 0x0000ffff,0x0000ffff, false},
 240   {R_IHIHALF, 0, 3, NA, true,  NA, NAB, true,a29k_reloc,"IHIHALF", true, 0xffff0000,0xffff0000, false},
 241   {R_IHCONST, 0, 3, NA, true,  NA, NAB, true,a29k_reloc,"IHCONST", true, 0xffff0000,0xffff0000, false},
 242   {R_BYTE,    0, 0, NA, false, NA, NAB, true,a29k_reloc,"BYTE",    true, 0x000000ff,0x000000ff, false},
 243   {R_HWORD,   0, 1, NA, false, NA, NAB, true,a29k_reloc,"HWORD",   true, 0x0000ffff,0x0000ffff, false},
 244   {R_WORD,    0, 2, NA, false, NA, NAB, true,a29k_reloc,"WORD",    true, 0xffffffff,0xffffffff, false},
 245 };
 246 #undef NA
 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 DEFUN(reloc_processing,(relent,reloc, symbols, abfd, section) ,
 254            arelent *relent AND
 255            struct internal_reloc *reloc AND
 256            asymbol **symbols AND
 257            bfd *abfd AND
 258            asection *section)
 259 {
 260     relent->address = reloc->r_vaddr;
 261     relent->howto = howto_table + reloc->r_type;
 262     if (reloc->r_type == R_IHCONST)
 263     {
 264         relent->addend = reloc->r_symndx;
 265         relent->sym_ptr_ptr= bfd_abs_section.symbol_ptr_ptr;
 266     }
 267     else
 268     {
 269       asymbol *ptr;
 270       relent->sym_ptr_ptr = symbols + obj_convert(abfd)[reloc->r_symndx];
 271
 272       ptr = *(relent->sym_ptr_ptr);
 273
 274       if (ptr
 275           && bfd_asymbol_bfd(ptr) == abfd
 276
 277           && ((ptr->flags & BSF_OLD_COMMON)== 0))
 278       {
 279           relent->addend = 0;
 280       }
 281       else
 282       {
 283           relent->addend = 0;
 284       }
 285       relent->address-= section->vma;
 286   }
 287 }
 288
 289 #include "coffcode.h"
 290
 291 bfd_target a29kcoff_big_vec =
 292 {
 293   "coff-a29k-big",              /* name */
 294   bfd_target_coff_flavour,
 295   true,                         /* data byte order is big */
 296   true,                         /* header byte order is big */
 297
 298   (HAS_RELOC | EXEC_P |         /* object flags */
 299    HAS_LINENO | HAS_DEBUG |
 300    HAS_SYMS | HAS_LOCALS | DYNAMIC | WP_TEXT),
 301
 302   (SEC_HAS_CONTENTS | SEC_ALLOC /* section flags */
 303    | SEC_LOAD | SEC_RELOC
 304    | SEC_READONLY ),
 305   '_',                          /* leading underscore */
 306   '/',                          /* ar_pad_char */
 307   15,                           /* ar_max_namelen */
 308   2,                            /* minimum section alignment */
 309   /* data */
 310   _do_getb64, _do_getb_signed_64, _do_putb64,
 311      _do_getb32, _do_getb_signed_32,   _do_putb32,
 312      _do_getb16, _do_getb_signed_16, _do_putb16,
 313   /* hdrs */
 314   _do_getb64, _do_getb_signed_64, _do_putb64,
 315      _do_getb32, _do_getb_signed_32,   _do_putb32,
 316      _do_getb16, _do_getb_signed_16, _do_putb16,
 317
 318  {
 319
 320    _bfd_dummy_target,
 321    coff_object_p,
 322    bfd_generic_archive_p,
 323    _bfd_dummy_target
 324   },
 325  {
 326    bfd_false,
 327    coff_mkobject,
 328    _bfd_generic_mkarchive,
 329    bfd_false
 330   },
 331  {
 332    bfd_false,
 333    coff_write_object_contents,
 334    _bfd_write_archive_contents,
 335    bfd_false
 336   },
 337
 338   JUMP_TABLE(coff),
 339   COFF_SWAP_TABLE
 340  };