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 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&~0x3ffff) == 0)
 130     {                           /* Absolute jmp/call */
 131       insn |= (1<<24);          /* Make it absolute */
 132       /* FIXME: Should we change r_type to R_IABS */
 133     }
 134     else
 135     {
 136       /* Relative jmp/call, so subtract from the value the
 137          address of the place we're coming from */
 138       signed_value -= (input_section->output_section->vma
 139                        + input_section->output_offset);
 140       if (signed_value>0x1ffff || signed_value<-0x20000)
 141        return(bfd_reloc_overflow);
 142     }
 143     signed_value >>= 2;
 144     insn = INSERT_HWORD(insn, signed_value);
 145     bfd_put_32(abfd, insn ,hit_data);
 146     break;
 147    case R_ILOHALF:
 148     insn = bfd_get_32(abfd, hit_data);
 149     unsigned_value = EXTRACT_HWORD(insn);
 150     unsigned_value +=  sym_value + reloc_entry->addend;
 151     insn = INSERT_HWORD(insn, unsigned_value);
 152     bfd_put_32(abfd, insn, hit_data);
 153     break;
 154    case R_IHIHALF:
 155     insn = bfd_get_32(abfd, hit_data);
 156     /* consth, part 1
 157        Just get the symbol value that is referenced */
 158     part1_consth_active = true;
 159     part1_consth_value = sym_value + reloc_entry->addend;
 160     /* Don't modify insn until R_IHCONST */
 161     break;
 162    case R_IHCONST:
 163     insn = bfd_get_32(abfd, hit_data);
 164     /* consth, part 2
 165        Now relocate the reference */
 166     if (part1_consth_active == false) {
 167       *error_message = (char *) "Missing IHIHALF";
 168       return(bfd_reloc_dangerous);
 169     }
 170     /* sym_ptr_ptr = r_symndx, in coff_slurp_reloc_table() */
 171     unsigned_value = 0;         /*EXTRACT_HWORD(insn) << 16;*/
 172     unsigned_value += reloc_entry->addend; /* r_symndx */
 173     unsigned_value += part1_consth_value;
 174     unsigned_value = unsigned_value >> 16;
 175     insn = INSERT_HWORD(insn, unsigned_value);
 176     part1_consth_active = false;
 177     bfd_put_32(abfd, insn, hit_data);
 178     break;
 179    case R_BYTE:
 180     insn = bfd_get_8(abfd, hit_data);
 181     unsigned_value = insn + sym_value + reloc_entry->addend;
 182     if (unsigned_value & 0xffffff00) {
 183       fprintf(stderr,"Relocation problem : ");
 184       fprintf(stderr,"byte value too large in module %s\n",
 185               abfd->filename);
 186       return(bfd_reloc_overflow);
 187     }
 188     bfd_put_8(abfd, unsigned_value, hit_data);
 189     break;
 190    case R_HWORD:
 191     insn = bfd_get_16(abfd, hit_data);
 192     unsigned_value = insn + sym_value + reloc_entry->addend;
 193     if (unsigned_value & 0xffff0000) {
 194       fprintf(stderr,"Relocation problem : ");
 195       fprintf(stderr,"hword value too large in module %s\n",
 196               abfd->filename);
 197       return(bfd_reloc_overflow);
 198     }
 199
 200     bfd_put_16(abfd, insn, hit_data);
 201     break;
 202    case R_WORD:
 203     insn = bfd_get_32(abfd, hit_data);
 204     insn += sym_value + reloc_entry->addend;
 205     bfd_put_32(abfd, insn, hit_data);
 206     break;
 207    default:
 208     *error_message = "Unrecognized reloc";
 209     return (bfd_reloc_dangerous);
 210   }
 211
 212
 213   return(bfd_reloc_ok);
 214 }
 215
 216 /*      type       rightshift
 217                        size
 218                           bitsize
 219                                pc-relative
 220                                      bitpos
 221                                          absolute
 222                                              complain_on_overflow
 223                                                   special_function
 224                                                     relocation name
 225                                                                partial_inplace
 226                                                                       src_mask
 227 */
 228
 229 /*FIXME: I'm not real sure about this table */
 230 static reloc_howto_type howto_table[] =
 231 {
 232   {R_ABS,     0, 3, 32, false, 0, complain_overflow_bitfield,a29k_reloc,"ABS",     true, 0xffffffff,0xffffffff, false},
 233   {1},  {2},  {3},   {4},  {5},  {6},  {7},  {8},  {9}, {10},
 234   {11}, {12}, {13}, {14}, {15}, {16}, {17}, {18}, {19}, {20},
 235   {21}, {22}, {23},
 236   {R_IREL,    0, 3, 32, true,  0, complain_overflow_signed,a29k_reloc,"IREL",    true, 0xffffffff,0xffffffff, false},
 237   {R_IABS,    0, 3, 32, false, 0, complain_overflow_bitfield, a29k_reloc,"IABS",    true, 0xffffffff,0xffffffff, false},
 238   {R_ILOHALF, 0, 3, 16, true,  0, complain_overflow_signed, a29k_reloc,"ILOHALF", true, 0x0000ffff,0x0000ffff, false},
 239   {R_IHIHALF, 0, 3, 16, true,  16, complain_overflow_signed, a29k_reloc,"IHIHALF", true, 0xffff0000,0xffff0000, false},
 240   {R_IHCONST, 0, 3, 16, true,  0, complain_overflow_signed, a29k_reloc,"IHCONST", true, 0xffff0000,0xffff0000, false},
 241   {R_BYTE,    0, 0, 8, false, 0, complain_overflow_bitfield, a29k_reloc,"BYTE",    true, 0x000000ff,0x000000ff, false},
 242   {R_HWORD,   0, 1, 16, false, 0, complain_overflow_bitfield, a29k_reloc,"HWORD",   true, 0x0000ffff,0x0000ffff, false},
 243   {R_WORD,    0, 2, 32, false, 0, complain_overflow_bitfield, a29k_reloc,"WORD",    true, 0xffffffff,0xffffffff, false},
 244 };
 245
 246 #define BADMAG(x) A29KBADMAG(x)
 247
 248 #define RELOC_PROCESSING(relent, reloc, symbols, abfd, section) \
 249  reloc_processing(relent, reloc, symbols, abfd, section)
 250
 251 static void DEFUN(reloc_processing,(relent,reloc, symbols, abfd, section) ,
 252            arelent *relent AND
 253            struct internal_reloc *reloc AND
 254            asymbol **symbols AND
 255            bfd *abfd AND
 256            asection *section)
 257 {
 258     relent->address = reloc->r_vaddr;
 259     relent->howto = howto_table + reloc->r_type;
 260     if (reloc->r_type == R_IHCONST)
 261     {
 262         relent->addend = reloc->r_symndx;
 263         relent->sym_ptr_ptr= bfd_abs_section.symbol_ptr_ptr;
 264     }
 265     else
 266     {
 267       asymbol *ptr;
 268       relent->sym_ptr_ptr = symbols + obj_convert(abfd)[reloc->r_symndx];
 269
 270       ptr = *(relent->sym_ptr_ptr);
 271
 272       if (ptr
 273           && bfd_asymbol_bfd(ptr) == abfd
 274
 275           && ((ptr->flags & BSF_OLD_COMMON)== 0))
 276       {
 277           relent->addend = 0;
 278       }
 279       else
 280       {
 281           relent->addend = 0;
 282       }
 283       relent->address-= section->vma;
 284   }
 285 }
 286
 287 #include "coffcode.h"
 288
 289 bfd_target a29kcoff_big_vec =
 290 {
 291   "coff-a29k-big",              /* name */
 292   bfd_target_coff_flavour,
 293   true,                         /* data byte order is big */
 294   true,                         /* header byte order is big */
 295
 296   (HAS_RELOC | EXEC_P |         /* object flags */
 297    HAS_LINENO | HAS_DEBUG |
 298    HAS_SYMS | HAS_LOCALS | WP_TEXT),
 299
 300   (SEC_HAS_CONTENTS | SEC_ALLOC /* section flags */
 301    | SEC_LOAD | SEC_RELOC
 302    | SEC_READONLY ),
 303   '_',                          /* leading underscore */
 304   '/',                          /* ar_pad_char */
 305   15,                           /* ar_max_namelen */
 306   2,                            /* minimum section alignment */
 307   /* data */
 308   bfd_getb64, bfd_getb_signed_64, bfd_putb64,
 309      bfd_getb32, bfd_getb_signed_32,   bfd_putb32,
 310      bfd_getb16, bfd_getb_signed_16, bfd_putb16,
 311   /* hdrs */
 312   bfd_getb64, bfd_getb_signed_64, bfd_putb64,
 313      bfd_getb32, bfd_getb_signed_32,   bfd_putb32,
 314      bfd_getb16, bfd_getb_signed_16, bfd_putb16,
 315
 316  {
 317
 318    _bfd_dummy_target,
 319    coff_object_p,
 320    bfd_generic_archive_p,
 321    _bfd_dummy_target
 322   },
 323  {
 324    bfd_false,
 325    coff_mkobject,
 326    _bfd_generic_mkarchive,
 327    bfd_false
 328   },
 329  {
 330    bfd_false,
 331    coff_write_object_contents,
 332    _bfd_write_archive_contents,
 333    bfd_false
 334   },
 335
 336   JUMP_TABLE(coff),
 337   COFF_SWAP_TABLE
 338  };