bfd/coff-w65.c

   1 /* BFD back-end for WDC 65816 COFF binaries.
   2    Copyright 1995, 96, 1997 Free Software Foundation, Inc.
   3    Written by Steve Chamberlain, <sac@cygnus.com>.
   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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  20
  21 #include "bfd.h"
  22 #include "sysdep.h"
  23 #include "libbfd.h"
  24 #include "bfdlink.h"
  25 #include "coff/w65.h"
  26 #include "coff/internal.h"
  27 #include "libcoff.h"
  28
  29 #define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (1)
  30 static reloc_howto_type howto_table[] =
  31 {
  32   HOWTO (R_W65_ABS8,    0,  0, 8, false, 0, complain_overflow_bitfield, 0, "abs8", true, 0x000000ff, 0x000000ff, false),
  33   HOWTO (R_W65_ABS16,   1,  0, 16, false, 0, complain_overflow_bitfield, 0, "abs16", true, 0x0000ffff, 0x0000ffff, false),
  34   HOWTO (R_W65_ABS24,   0,  2, 32, false, 0, complain_overflow_bitfield, 0, "abs24", true, 0x00ffffff, 0x00ffffff, false),
  35   HOWTO (R_W65_ABS8S8,  0,  0, 8, false, 0, complain_overflow_bitfield, 0, ">abs8", true, 0x000000ff, 0x000000ff, false),
  36   HOWTO (R_W65_ABS8S16, 0,  0, 8, false, 0, complain_overflow_bitfield, 0, "^abs8", true, 0x000000ff, 0x000000ff, false),
  37   HOWTO (R_W65_ABS16S8, 1,  0, 16, false, 0, complain_overflow_bitfield, 0, ">abs16", true, 0x0000ffff, 0x0000ffff, false),
  38   HOWTO (R_W65_ABS16S16,1,  0, 16, false, 0, complain_overflow_bitfield, 0, "^abs16", true, 0x0000ffff, 0x0000ffff, false),
  39   HOWTO (R_W65_PCR8,    0,  0, 8, false, 0, complain_overflow_bitfield, 0, "pcrel8", true, 0x000000ff, 0x000000ff, true),
  40   HOWTO (R_W65_PCR16,   1,  0, 16, false, 0, complain_overflow_bitfield, 0, "pcrel16", true, 0x0000ffff, 0x0000ffff, true),
  41   HOWTO (R_W65_DP,    0,  0, 8, false, 0, complain_overflow_bitfield, 0, "dp", true, 0x000000ff, 0x000000ff, false),
  42
  43 };
  44
  45 /* Turn a howto into a reloc number */
  46
  47 #define SELECT_RELOC(x,howto) \
  48   { x.r_type = select_reloc(howto); }
  49
  50 #define BADMAG(x) (W65BADMAG(x))
  51 #define W65 1                   /* Customize coffcode.h */
  52 #define __A_MAGIC_SET__
  53
  54 /* Code to swap in the reloc */
  55 #define SWAP_IN_RELOC_OFFSET   bfd_h_get_32
  56 #define SWAP_OUT_RELOC_OFFSET bfd_h_put_32
  57 #define SWAP_OUT_RELOC_EXTRA(abfd, src, dst) \
  58   dst->r_stuff[0] = 'S'; \
  59   dst->r_stuff[1] = 'C';
  60
  61 static int
  62 select_reloc (howto)
  63      reloc_howto_type *howto;
  64 {
  65   return howto->type ;
  66 }
  67
  68 /* Code to turn a r_type into a howto ptr, uses the above howto table
  69    */
  70
  71 static void
  72 rtype2howto (internal, dst)
  73      arelent *internal;
  74      struct internal_reloc *dst;
  75 {
  76       internal->howto = howto_table + dst->r_type - 1;
  77 }
  78
  79 #define RTYPE2HOWTO(internal, relocentry) rtype2howto(internal,relocentry)
  80
  81 /* Perform any necessary magic to the addend in a reloc entry */
  82
  83 #define CALC_ADDEND(abfd, symbol, ext_reloc, cache_ptr) \
  84  cache_ptr->addend =  ext_reloc.r_offset;
  85
  86 #define RELOC_PROCESSING(relent,reloc,symbols,abfd,section) \
  87  reloc_processing(relent, reloc, symbols, abfd, section)
  88
  89 static void
  90 reloc_processing (relent, reloc, symbols, abfd, section)
  91      arelent * relent;
  92      struct internal_reloc *reloc;
  93      asymbol ** symbols;
  94      bfd * abfd;
  95      asection * section;
  96 {
  97   relent->address = reloc->r_vaddr;
  98   rtype2howto (relent, reloc);
  99
 100   if (((int) reloc->r_symndx) > 0)
 101     {
 102       relent->sym_ptr_ptr = symbols + obj_convert (abfd)[reloc->r_symndx];
 103     }
 104   else
 105     {
 106       relent->sym_ptr_ptr = (asymbol **)&(bfd_abs_symbol);
 107     }
 108
 109   relent->addend = reloc->r_offset;
 110
 111   relent->address -= section->vma;
 112   /*  relent->section = 0;*/
 113 }
 114
 115 static int
 116 h8300_reloc16_estimate(abfd, input_section, reloc, shrink, link_info)
 117      bfd *abfd;
 118      asection *input_section;
 119      arelent *reloc;
 120      unsigned int shrink;
 121      struct bfd_link_info *link_info;
 122 {
 123   bfd_vma value;
 124   bfd_vma dot;
 125   bfd_vma gap;
 126
 127   /* The address of the thing to be relocated will have moved back by
 128    the size of the shrink  - but we don't change reloc->address here,
 129    since we need it to know where the relocation lives in the source
 130    uncooked section */
 131
 132   /*  reloc->address -= shrink;   conceptual */
 133
 134   bfd_vma address = reloc->address - shrink;
 135
 136   switch (reloc->howto->type)
 137     {
 138     case R_MOV16B2:
 139     case R_JMP2:
 140       shrink+=2;
 141       break;
 142
 143       /* Thing is a move one byte */
 144     case R_MOV16B1:
 145       value = bfd_coff_reloc16_get_value(reloc, link_info, input_section);
 146
 147       if (value >= 0xff00)
 148         {
 149
 150           /* Change the reloc type from 16bit, possible 8 to 8bit
 151              possible 16 */
 152           reloc->howto = reloc->howto + 1;
 153           /* The place to relc moves back by one */
 154           /* This will be two bytes smaller in the long run */
 155           shrink +=2 ;
 156           bfd_perform_slip(abfd, 2, input_section, address);
 157         }
 158
 159       break;
 160       /* This is the 24 bit branch which could become an 8 bitter,
 161        the relocation points to the first byte of the insn, not the
 162        actual data */
 163
 164     case R_JMPL1:
 165       value = bfd_coff_reloc16_get_value(reloc, link_info, input_section);
 166
 167       dot = input_section->output_section->vma +
 168         input_section->output_offset + address;
 169
 170       /* See if the address we're looking at within 127 bytes of where
 171          we are, if so then we can use a small branch rather than the
 172          jump we were going to */
 173
 174       gap = value - dot ;
 175
 176       if (-120 < (long)gap && (long)gap < 120 )
 177         {
 178
 179           /* Change the reloc type from 24bit, possible 8 to 8bit
 180              possible 32 */
 181           reloc->howto = reloc->howto + 1;
 182           /* This will be two bytes smaller in the long run */
 183           shrink +=2 ;
 184           bfd_perform_slip(abfd, 2, input_section, address);
 185         }
 186       break;
 187
 188     case R_JMP1:
 189
 190       value = bfd_coff_reloc16_get_value(reloc, link_info, input_section);
 191
 192       dot = input_section->output_section->vma +
 193         input_section->output_offset + address;
 194
 195       /* See if the address we're looking at within 127 bytes of where
 196          we are, if so then we can use a small branch rather than the
 197          jump we were going to */
 198
 199       gap = value - (dot - shrink);
 200
 201       if (-120 < (long)gap && (long)gap < 120 )
 202         {
 203
 204           /* Change the reloc type from 16bit, possible 8 to 8bit
 205              possible 16 */
 206           reloc->howto = reloc->howto + 1;
 207           /* The place to relc moves back by one */
 208
 209           /* This will be two bytes smaller in the long run */
 210           shrink +=2 ;
 211           bfd_perform_slip(abfd, 2, input_section, address);
 212         }
 213       break;
 214     }
 215
 216   return shrink;
 217 }
 218
 219 /* First phase of a relaxing link */
 220
 221 /* Reloc types
 222    large                small
 223    R_MOV16B1            R_MOV16B2       mov.b with 16bit or 8 bit address
 224    R_JMP1               R_JMP2          jmp or pcrel branch
 225    R_JMPL1              R_JMPL_B8       24jmp or pcrel branch
 226    R_MOV24B1            R_MOV24B2       24 or 8 bit reloc for mov.b
 227
 228 */
 229
 230 static void
 231 h8300_reloc16_extra_cases (abfd, link_info, link_order, reloc, data, src_ptr,
 232                            dst_ptr)
 233      bfd *abfd;
 234      struct bfd_link_info *link_info;
 235      struct bfd_link_order *link_order;
 236      arelent *reloc;
 237      bfd_byte *data;
 238      unsigned int *src_ptr;
 239      unsigned int *dst_ptr;
 240 {
 241   unsigned int src_address = *src_ptr;
 242   unsigned int dst_address = *dst_ptr;
 243   asection *input_section = link_order->u.indirect.section;
 244
 245   switch (reloc->howto->type)
 246     {
 247     case R_W65_ABS8:
 248     case R_W65_DP:
 249       {
 250         unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
 251                                                        input_section);
 252         bfd_put_8 (abfd, gap, data + dst_address);
 253         dst_address += 1;
 254         src_address += 1;
 255       }
 256       break;
 257
 258     case R_W65_ABS8S8:
 259       {
 260         unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
 261                                                        input_section);
 262         gap >>= 8;
 263         bfd_put_8 (abfd, gap, data + dst_address);
 264         dst_address += 1;
 265         src_address += 1;
 266       }
 267       break;
 268
 269     case R_W65_ABS8S16:
 270       {
 271         unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
 272                                                        input_section);
 273         gap >>=16;
 274         bfd_put_8 (abfd, gap, data + dst_address);
 275         dst_address += 1;
 276         src_address += 1;
 277       }
 278       break;
 279
 280     case R_W65_ABS16:
 281       {
 282         unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
 283                                                        input_section);
 284
 285         bfd_put_16 (abfd, gap, data + dst_address);
 286         dst_address += 2;
 287         src_address += 2;
 288       }
 289       break;
 290     case R_W65_ABS16S8:
 291       {
 292         unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
 293                                                        input_section);
 294         gap >>= 8;
 295         bfd_put_16 (abfd, gap, data + dst_address);
 296         dst_address += 2;
 297         src_address += 2;
 298       }
 299       break;
 300     case R_W65_ABS16S16:
 301       {
 302         unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
 303                                                        input_section);
 304         gap >>= 16;
 305         bfd_put_16 (abfd, gap, data + dst_address);
 306         dst_address += 2;
 307         src_address += 2;
 308       }
 309       break;
 310
 311     case R_W65_ABS24:
 312       {
 313         unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
 314                                                        input_section);
 315         bfd_put_16 (abfd, gap, data + dst_address);
 316         bfd_put_8 (abfd, gap>>16, data+dst_address+2);
 317         dst_address += 3;
 318         src_address += 3;
 319       }
 320       break;
 321
 322     case R_W65_PCR8:
 323       {
 324         int gap = bfd_coff_reloc16_get_value (reloc, link_info,
 325                                               input_section);
 326         bfd_vma dot = link_order->offset
 327           + dst_address
 328             + link_order->u.indirect.section->output_section->vma;
 329
 330         gap -= dot + 1;
 331         if (gap < -128 || gap > 127) {
 332           if (! ((*link_info->callbacks->reloc_overflow)
 333                  (link_info, bfd_asymbol_name (*reloc->sym_ptr_ptr),
 334                   reloc->howto->name, reloc->addend, input_section->owner,
 335                   input_section, reloc->address)))
 336             abort ();
 337         }
 338         bfd_put_8 (abfd, gap, data + dst_address);
 339         dst_address += 1;
 340         src_address += 1;
 341       }
 342       break;
 343
 344     case R_W65_PCR16:
 345       {
 346         bfd_vma gap = bfd_coff_reloc16_get_value (reloc, link_info,
 347                                                   input_section);
 348         bfd_vma dot = link_order->offset
 349           + dst_address
 350             + link_order->u.indirect.section->output_section->vma;
 351
 352         /* This wraps within the page, so ignore the relativeness, look at the
 353            high part */
 354         if ((gap & 0xf0000) != (dot & 0xf0000)) {
 355           if (! ((*link_info->callbacks->reloc_overflow)
 356                  (link_info, bfd_asymbol_name (*reloc->sym_ptr_ptr),
 357                   reloc->howto->name, reloc->addend, input_section->owner,
 358                   input_section, reloc->address)))
 359             abort ();
 360         }
 361
 362         gap -= dot + 2;
 363         bfd_put_16 (abfd, gap, data + dst_address);
 364         dst_address += 2;
 365         src_address += 2;
 366       }
 367       break;
 368     default:
 369       printf (_("ignoring reloc %s\n"), reloc->howto->name);
 370       break;
 371
 372     }
 373   *src_ptr = src_address;
 374   *dst_ptr = dst_address;
 375
 376 }
 377
 378 #define coff_reloc16_extra_cases h8300_reloc16_extra_cases
 379 #define coff_reloc16_estimate h8300_reloc16_estimate
 380
 381 #include "coffcode.h"
 382
 383 #undef coff_bfd_get_relocated_section_contents
 384 #undef coff_bfd_relax_section
 385 #define coff_bfd_get_relocated_section_contents \
 386   bfd_coff_reloc16_get_relocated_section_contents
 387 #define coff_bfd_relax_section bfd_coff_reloc16_relax_section
 388
 389 CREATE_LITTLE_COFF_TARGET_VEC (w65_vec, "coff-w65", BFD_IS_RELAXABLE, 0, '_', NULL)