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 != (asymbol *)NULL) {
  48       if (symbol->section == &bfd_com_section)
  49       {
  50
  51       relocation = 0;
  52     } else {
  53       relocation = symbol->value;
  54     }
  55     if (symbol->section != (asection *)NULL) {
  56       relocation += 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 DEFUN(a29k_reloc,(abfd, reloc_entry, symbol_in, data, input_section),
  67       bfd *abfd AND
  68       arelent *reloc_entry AND
  69       asymbol *symbol_in AND
  70       unsigned char *data AND
  71       asection *input_section)
  72 {
  73     /* the consth relocation comes in two parts, we have to remember
  74        the state between calls, in these variables */
  75     static boolean part1_consth_active = false;
  76     static unsigned long part1_consth_value;
  77
  78     unsigned long insn;
  79     unsigned long sym_value;
  80     unsigned long unsigned_value;
  81     unsigned short r_type;
  82     long signed_value;
  83
  84
  85     r_type = reloc_entry->howto->type;
  86
  87     /* FIXME: Do we need to check for partial linking here */
  88     if (symbol_in && (symbol_in->section == &bfd_und_section))
  89     {
  90         /* Keep the state machine happy in case we're called again */
  91         if (r_type == R_IHIHALF)
  92         {
  93             part1_consth_active = true;
  94             part1_consth_value  = 0;
  95         }
  96         return(bfd_reloc_undefined);
  97     }
  98
  99     if ((part1_consth_active) && (r_type != R_IHCONST))
 100     {
 101         fprintf(stderr,"Relocation problem : ");
 102         fprintf(stderr,"Missing IHCONST in module %s\n",abfd->filename);
 103         part1_consth_active = false;
 104         return(bfd_reloc_dangerous);
 105     }
 106
 107     insn = bfd_get_32(abfd, data + reloc_entry->address);
 108     sym_value = get_symbol_value(symbol_in);
 109
 110     switch (r_type)
 111     {
 112       case R_IREL:
 113         /* Take the value in the field and sign extend it */
 114         signed_value = EXTRACT_HWORD(insn) << 2;
 115         signed_value = SIGN_EXTEND_HWORD(signed_value);
 116         signed_value +=  sym_value + reloc_entry->addend;
 117         if ((signed_value&~0x3ffff) == 0)
 118         {                       /* Absolute jmp/call */
 119             insn |= (1<<24);    /* Make it absolute */
 120             /* FIXME: Should we change r_type to R_IABS */
 121             signed_value /= 2;
 122         }
 123         else
 124         {
 125             /* Relative jmp/call, so subtract from the value the
 126                address of the place we're coming from */
 127             signed_value -= reloc_entry->address +
 128              input_section->output_section->vma +
 129               input_section->output_offset;
 130             if (signed_value>0x1ffff || signed_value<-0x20000)
 131              return(bfd_reloc_outofrange);
 132
 133             signed_value /= 2;
 134         }
 135         insn = INSERT_HWORD(insn, signed_value);
 136         break;
 137       case R_ILOHALF:
 138         unsigned_value = EXTRACT_HWORD(insn);
 139         unsigned_value +=  sym_value + reloc_entry->addend;
 140         insn = INSERT_HWORD(insn, unsigned_value);
 141         break;
 142       case R_IHIHALF:
 143         /* consth, part 1
 144           Just get the symbol value that is referenced */
 145         part1_consth_active = true;
 146         part1_consth_value = sym_value + reloc_entry->addend;
 147         /* Don't modify insn until R_IHCONST */
 148         return(bfd_reloc_ok);
 149         break;
 150       case R_IHCONST:
 151         /* consth, part 2
 152            Now relocate the reference */
 153         if (part1_consth_active == false) {
 154             fprintf(stderr,"Relocation problem : ");
 155             fprintf(stderr,"IHIHALF missing in module %s\n",
 156                     abfd->filename);
 157             return(bfd_reloc_dangerous);
 158         }
 159         /* sym_ptr_ptr = r_symndx, in coff_slurp_reloc_table() */
 160         unsigned_value = 0;     /*EXTRACT_HWORD(insn) << 16;*/
 161         unsigned_value += reloc_entry->addend; /* r_symndx */
 162         unsigned_value += part1_consth_value;
 163         unsigned_value = unsigned_value >> 16;
 164         insn = INSERT_HWORD(insn, unsigned_value);
 165         part1_consth_active = false;
 166         break;
 167       case R_BYTE:
 168         unsigned_value = (insn >> 24) + sym_value + reloc_entry->addend;
 169         if (unsigned_value & 0xffffff00) {
 170             fprintf(stderr,"Relocation problem : ");
 171             fprintf(stderr,"byte value too large in module %s\n",
 172                     abfd->filename);
 173             return(bfd_reloc_overflow);
 174         }
 175         insn = (insn & 0x00ffffff) | (unsigned_value << 24);
 176         break;
 177       case R_HWORD:
 178         unsigned_value = (insn >> 16) + sym_value + reloc_entry->addend;
 179         if (unsigned_value & 0xffff0000) {
 180             fprintf(stderr,"Relocation problem : ");
 181             fprintf(stderr,"hword value too large in module %s\n",
 182                     abfd->filename);
 183             return(bfd_reloc_overflow);
 184         }
 185         insn = (insn & 0x0000ffff) | (unsigned_value<<16);
 186         break;
 187       case R_WORD:
 188         insn += sym_value + reloc_entry->addend;
 189         break;
 190       default:
 191         fprintf(stderr,"Relocation problem : ");
 192         fprintf(stderr,"Unrecognized reloc type %d, in module %s\n",
 193                 r_type,abfd->filename);
 194         return (bfd_reloc_dangerous);
 195     }
 196
 197     bfd_put_32(abfd, insn, data+reloc_entry->address);
 198     return(bfd_reloc_ok);
 199 }
 200
 201 /*      type       rightshift
 202                        size
 203                           bitsize
 204                                pc-relative
 205                                      bitpos
 206                                          absolute
 207                                              complain_on_overflow
 208                                                   special_function
 209                                                     relocation name
 210                                                                partial_inplace
 211                                                                       src_mask
 212 */
 213
 214 /*FIXME: I'm not real sure about this table */
 215 #define NA      0       /* Obsolete fields, via the documentation */
 216 static reloc_howto_type howto_table[] =
 217 {
 218   {R_ABS,     0, 3, NA, false, NA, NA, true,a29k_reloc,"ABS",     true, 0xffffffff,0xffffffff, false},
 219   {1},  {2},  {3},   {4},  {5},  {6},  {7},  {8},  {9}, {10},
 220   {11}, {12}, {13}, {14}, {15}, {16}, {17}, {18}, {19}, {20},
 221   {21}, {22}, {23},
 222   {R_IREL,    0, 3, NA, true,  NA, NA, true,a29k_reloc,"IREL",    true, 0xffffffff,0xffffffff, false},
 223   {R_IABS,    0, 3, NA, false, NA, NA, true,a29k_reloc,"IABS",    true, 0xffffffff,0xffffffff, false},
 224   {R_ILOHALF, 0, 3, NA, true,  NA, NA, true,a29k_reloc,"ILOHALF", true, 0x0000ffff,0x0000ffff, false},
 225   {R_IHIHALF, 0, 3, NA, true,  NA, NA, true,a29k_reloc,"IHIHALF", true, 0xffff0000,0xffff0000, false},
 226   {R_IHCONST, 0, 3, NA, true,  NA, NA, true,a29k_reloc,"IHCONST", true, 0xffff0000,0xffff0000, false},
 227   {R_BYTE,    0, 0, NA, false, NA, NA, true,a29k_reloc,"BYTE",    true, 0x000000ff,0x000000ff, false},
 228   {R_HWORD,   0, 1, NA, false, NA, NA, true,a29k_reloc,"HWORD",   true, 0x0000ffff,0x0000ffff, false},
 229   {R_WORD,    0, 2, NA, false, NA, NA, true,a29k_reloc,"WORD",    true, 0xffffffff,0xffffffff, false},
 230 };
 231 #undef NA
 232
 233 #define BADMAG(x) A29KBADMAG(x)
 234
 235 #define RELOC_PROCESSING(relent, reloc, symbols, abfd, section) \
 236  reloc_processing(relent, reloc, symbols, abfd, section)
 237
 238 static void DEFUN(reloc_processing,(relent,reloc, symbols, abfd, section) ,
 239            arelent *relent AND
 240            struct internal_reloc *reloc AND
 241            asymbol **symbols AND
 242            bfd *abfd AND
 243            asection *section)
 244 {
 245     relent->address = reloc->r_vaddr;
 246     relent->howto = howto_table + reloc->r_type;
 247     if (reloc->r_type == R_IHCONST)
 248     {
 249         relent->addend = reloc->r_symndx;
 250         relent->sym_ptr_ptr= 0;
 251     }
 252     else
 253     {
 254       asymbol *ptr;
 255       relent->sym_ptr_ptr = symbols + obj_convert(abfd)[reloc->r_symndx];
 256
 257       ptr = *(relent->sym_ptr_ptr);
 258
 259       if (ptr
 260           && ptr->the_bfd == abfd
 261           && ptr->section != (asection *) NULL
 262           && ((ptr->flags & BSF_OLD_COMMON)== 0))
 263       {
 264           relent->addend = -(ptr->section->vma + ptr->value);
 265       }
 266       else
 267       {
 268           relent->addend = 0;
 269       }
 270       relent->address-= section->vma;
 271 /*      relent->section = 0;*/
 272   }
 273 }
 274
 275 #include "coffcode.h"
 276
 277 bfd_target a29kcoff_big_vec =
 278 {
 279     "coff-a29k-big",            /* name */
 280     bfd_target_coff_flavour,
 281     true,                       /* data byte order is big */
 282     true,                       /* header byte order is big */
 283
 284     (HAS_RELOC | EXEC_P |       /* object flags */
 285      HAS_LINENO | HAS_DEBUG |
 286      HAS_SYMS | HAS_LOCALS | DYNAMIC | WP_TEXT),
 287
 288     (SEC_HAS_CONTENTS | SEC_ALLOC /* section flags */
 289      | SEC_LOAD | SEC_RELOC
 290      | SEC_READONLY ),
 291     '/',                        /* ar_pad_char */
 292     15,                         /* ar_max_namelen */
 293     2,                          /* minimum section alignment */
 294     /* data */
 295     _do_getb64, _do_putb64, _do_getb32,
 296     _do_putb32, _do_getb16, _do_putb16,
 297     /* hdrs */
 298     _do_getb64, _do_putb64, _do_getb32,
 299     _do_putb32, _do_getb16, _do_putb16,
 300
 301   {
 302
 303       _bfd_dummy_target,
 304       coff_object_p,
 305       bfd_generic_archive_p,
 306       _bfd_dummy_target
 307    },
 308   {
 309       bfd_false,
 310       coff_mkobject,
 311       _bfd_generic_mkarchive,
 312       bfd_false
 313    },
 314   {
 315       bfd_false,
 316       coff_write_object_contents,
 317       _bfd_write_archive_contents,
 318       bfd_false
 319    },
 320
 321     JUMP_TABLE(coff),
 322     COFF_SWAP_TABLE
 323  };
 324