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),
  65       bfd *abfd AND
  66       arelent *reloc_entry AND
  67       asymbol *symbol_in AND
  68       PTR data AND
  69       asection *input_section)
  70 {
  71   /* the consth relocation comes in two parts, we have to remember
  72      the state between calls, in these variables */
  73   static boolean part1_consth_active = false;
  74   static unsigned long part1_consth_value;
  75
  76   unsigned long insn;
  77   unsigned long sym_value;
  78   unsigned long unsigned_value;
  79   unsigned short r_type;
  80   long signed_value;
  81
  82   unsigned long addr = reloc_entry->address + input_section->vma;
  83   bfd_byte  *hit_data =addr + (bfd_byte *)(data);
  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
 108   sym_value = get_symbol_value(symbol_in);
 109
 110   switch (r_type)
 111   {
 112    case R_IREL:
 113     insn = bfd_get_32(abfd, hit_data);
 114     /* Take the value in the field and sign extend it */
 115     signed_value = EXTRACT_HWORD(insn) << 2;
 116     signed_value = SIGN_EXTEND_HWORD(signed_value);
 117     signed_value +=  sym_value + reloc_entry->addend;
 118     if ((signed_value&~0x3ffff) == 0)
 119     {                           /* Absolute jmp/call */
 120       insn |= (1<<24);          /* Make it absolute */
 121       /* FIXME: Should we change r_type to R_IABS */
 122       signed_value /= 2;
 123     }
 124     else
 125     {
 126       /* Relative jmp/call, so subtract from the value the
 127          address of the place we're coming from */
 128       signed_value -= reloc_entry->address +
 129        input_section->output_section->vma +
 130         input_section->output_offset;
 131       if (signed_value>0x1ffff || signed_value<-0x20000)
 132        return(bfd_reloc_outofrange);
 133
 134       signed_value /= 2;
 135     }
 136     insn = INSERT_HWORD(insn, signed_value);
 137     bfd_put_32(abfd, insn ,hit_data);
 138     break;
 139    case R_ILOHALF:
 140     insn = bfd_get_32(abfd, hit_data);
 141     unsigned_value = EXTRACT_HWORD(insn);
 142     unsigned_value +=  sym_value + reloc_entry->addend;
 143     insn = INSERT_HWORD(insn, unsigned_value);
 144     bfd_put_32(abfd, insn, hit_data);
 145     break;
 146    case R_IHIHALF:
 147     insn = bfd_get_32(abfd, hit_data);
 148     /* consth, part 1
 149        Just get the symbol value that is referenced */
 150     part1_consth_active = true;
 151     part1_consth_value = sym_value + reloc_entry->addend;
 152     /* Don't modify insn until R_IHCONST */
 153     break;
 154    case R_IHCONST:
 155     insn = bfd_get_32(abfd, hit_data);
 156     /* consth, part 2
 157        Now relocate the reference */
 158     if (part1_consth_active == false) {
 159       fprintf(stderr,"Relocation problem : ");
 160       fprintf(stderr,"IHIHALF missing in module %s\n",
 161               abfd->filename);
 162       return(bfd_reloc_dangerous);
 163     }
 164     /* sym_ptr_ptr = r_symndx, in coff_slurp_reloc_table() */
 165     unsigned_value = 0;         /*EXTRACT_HWORD(insn) << 16;*/
 166     unsigned_value += reloc_entry->addend; /* r_symndx */
 167     unsigned_value += part1_consth_value;
 168     unsigned_value = unsigned_value >> 16;
 169     insn = INSERT_HWORD(insn, unsigned_value);
 170     part1_consth_active = false;
 171     bfd_put_32(abfd, insn, hit_data);
 172     break;
 173    case R_BYTE:
 174     insn = bfd_get_8(abfd, hit_data);
 175     unsigned_value = insn + sym_value + reloc_entry->addend;
 176     if (unsigned_value & 0xffffff00) {
 177       fprintf(stderr,"Relocation problem : ");
 178       fprintf(stderr,"byte value too large in module %s\n",
 179               abfd->filename);
 180       return(bfd_reloc_overflow);
 181     }
 182     bfd_put_8(abfd, insn, hit_data);
 183     break;
 184    case R_HWORD:
 185     insn = bfd_get_16(abfd, hit_data);
 186     unsigned_value = insn + sym_value + reloc_entry->addend;
 187     if (unsigned_value & 0xffff0000) {
 188       fprintf(stderr,"Relocation problem : ");
 189       fprintf(stderr,"hword value too large in module %s\n",
 190               abfd->filename);
 191       return(bfd_reloc_overflow);
 192     }
 193
 194      bfd_put_16(abfd, insn, hit_data);
 195     break;
 196    case R_WORD:
 197     insn = bfd_get_32(abfd, hit_data);
 198     insn += sym_value + reloc_entry->addend;
 199     bfd_put_32(abfd, insn, hit_data);
 200     break;
 201    default:
 202     fprintf(stderr,"Relocation problem : ");
 203     fprintf(stderr,"Unrecognized reloc type %d, in module %s\n",
 204             r_type,abfd->filename);
 205     return (bfd_reloc_dangerous);
 206   }
 207
 208
 209   return(bfd_reloc_ok);
 210 }
 211
 212 /*      type       rightshift
 213                        size
 214                           bitsize
 215                                pc-relative
 216                                      bitpos
 217                                          absolute
 218                                              complain_on_overflow
 219                                                   special_function
 220                                                     relocation name
 221                                                                partial_inplace
 222                                                                       src_mask
 223 */
 224
 225 /*FIXME: I'm not real sure about this table */
 226 #define NA      0       /* Obsolete fields, via the documentation */
 227 #define NAB false
 228 static reloc_howto_type howto_table[] =
 229 {
 230   {R_ABS,     0, 3, NA, false, NA, NAB, true,a29k_reloc,"ABS",     true, 0xffffffff,0xffffffff, false},
 231   {1},  {2},  {3},   {4},  {5},  {6},  {7},  {8},  {9}, {10},
 232   {11}, {12}, {13}, {14}, {15}, {16}, {17}, {18}, {19}, {20},
 233   {21}, {22}, {23},
 234   {R_IREL,    0, 3, NA, true,  NA, NAB, true,a29k_reloc,"IREL",    true, 0xffffffff,0xffffffff, false},
 235   {R_IABS,    0, 3, NA, false, NA, NAB, true,a29k_reloc,"IABS",    true, 0xffffffff,0xffffffff, false},
 236   {R_ILOHALF, 0, 3, NA, true,  NA, NAB, true,a29k_reloc,"ILOHALF", true, 0x0000ffff,0x0000ffff, false},
 237   {R_IHIHALF, 0, 3, NA, true,  NA, NAB, true,a29k_reloc,"IHIHALF", true, 0xffff0000,0xffff0000, false},
 238   {R_IHCONST, 0, 3, NA, true,  NA, NAB, true,a29k_reloc,"IHCONST", true, 0xffff0000,0xffff0000, false},
 239   {R_BYTE,    0, 0, NA, false, NA, NAB, true,a29k_reloc,"BYTE",    true, 0x000000ff,0x000000ff, false},
 240   {R_HWORD,   0, 1, NA, false, NA, NAB, true,a29k_reloc,"HWORD",   true, 0x0000ffff,0x0000ffff, false},
 241   {R_WORD,    0, 2, NA, false, NA, NAB, true,a29k_reloc,"WORD",    true, 0xffffffff,0xffffffff, false},
 242 };
 243 #undef NA
 244
 245 #define BADMAG(x) A29KBADMAG(x)
 246
 247 #define RELOC_PROCESSING(relent, reloc, symbols, abfd, section) \
 248  reloc_processing(relent, reloc, symbols, abfd, section)
 249
 250 static void DEFUN(reloc_processing,(relent,reloc, symbols, abfd, section) ,
 251            arelent *relent AND
 252            struct internal_reloc *reloc AND
 253            asymbol **symbols AND
 254            bfd *abfd AND
 255            asection *section)
 256 {
 257     relent->address = reloc->r_vaddr;
 258     relent->howto = howto_table + reloc->r_type;
 259     if (reloc->r_type == R_IHCONST)
 260     {
 261         relent->addend = reloc->r_symndx;
 262         relent->sym_ptr_ptr= bfd_abs_section.symbol_ptr_ptr;
 263     }
 264     else
 265     {
 266       asymbol *ptr;
 267       relent->sym_ptr_ptr = symbols + obj_convert(abfd)[reloc->r_symndx];
 268
 269       ptr = *(relent->sym_ptr_ptr);
 270
 271       if (ptr
 272           && ptr->the_bfd == abfd
 273
 274           && ((ptr->flags & BSF_OLD_COMMON)== 0))
 275       {
 276           relent->addend = 0;
 277       }
 278       else
 279       {
 280           relent->addend = 0;
 281       }
 282       relent->address-= section->vma;
 283   }
 284 }
 285
 286 #include "coffcode.h"
 287
 288 bfd_target a29kcoff_big_vec =
 289 {
 290     "coff-a29k-big",            /* name */
 291     bfd_target_coff_flavour,
 292     true,                       /* data byte order is big */
 293     true,                       /* header byte order is big */
 294
 295     (HAS_RELOC | EXEC_P |       /* object flags */
 296      HAS_LINENO | HAS_DEBUG |
 297      HAS_SYMS | HAS_LOCALS | DYNAMIC | WP_TEXT),
 298
 299     (SEC_HAS_CONTENTS | SEC_ALLOC /* section flags */
 300      | SEC_LOAD | SEC_RELOC
 301      | SEC_READONLY ),
 302     '/',                        /* ar_pad_char */
 303     15,                         /* ar_max_namelen */
 304     2,                          /* minimum section alignment */
 305     /* data */
 306     _do_getb64, _do_putb64, _do_getb32,
 307     _do_putb32, _do_getb16, _do_putb16,
 308     /* hdrs */
 309     _do_getb64, _do_putb64, _do_getb32,
 310     _do_putb32, _do_getb16, _do_putb16,
 311
 312   {
 313
 314       _bfd_dummy_target,
 315       coff_object_p,
 316       bfd_generic_archive_p,
 317       _bfd_dummy_target
 318    },
 319   {
 320       bfd_false,
 321       coff_mkobject,
 322       _bfd_generic_mkarchive,
 323       bfd_false
 324    },
 325   {
 326       bfd_false,
 327       coff_write_object_contents,
 328       _bfd_write_archive_contents,
 329       bfd_false
 330    },
 331
 332     JUMP_TABLE(coff),
 333     COFF_SWAP_TABLE
 334  };
 335