bfd/coff-w65.c

   1 /* BFD back-end for WDC 65816 COFF binaries.
   2    Copyright 1995, 1996, 1997, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
   3    2006, 2007 Free Software Foundation, Inc.
   4    Written by Steve Chamberlain, <sac@cygnus.com>.
   5
   6    This file is part of BFD, the Binary File Descriptor library.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  21    MA 02110-1301, USA.  */
  22
  23 #include "sysdep.h"
  24 #include "bfd.h"
  25 #include "libbfd.h"
  26 #include "bfdlink.h"
  27 #include "coff/w65.h"
  28 #include "coff/internal.h"
  29 #include "libcoff.h"
  30
  31 static int  select_reloc              PARAMS ((reloc_howto_type *));
  32 static void rtype2howto               PARAMS ((arelent *, struct internal_reloc *));
  33 static void reloc_processing          PARAMS ((arelent *, struct internal_reloc *, asymbol **, bfd *, asection *));
  34 static int  w65_reloc16_estimate    PARAMS ((bfd *, asection *, arelent *, unsigned int, struct bfd_link_info *));
  35 static void w65_reloc16_extra_cases PARAMS ((bfd *,struct bfd_link_info *, struct bfd_link_order *, arelent *, bfd_byte *, unsigned int *, unsigned int *));
  36
  37 #define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (1)
  38 static reloc_howto_type howto_table[] =
  39   {
  40     HOWTO (R_W65_ABS8,    0,  0, 8,  FALSE, 0, complain_overflow_bitfield, 0, "abs8", TRUE, 0x000000ff, 0x000000ff, FALSE),
  41     HOWTO (R_W65_ABS16,   1,  0, 16, FALSE, 0, complain_overflow_bitfield, 0, "abs16", TRUE, 0x0000ffff, 0x0000ffff, FALSE),
  42     HOWTO (R_W65_ABS24,   0,  2, 32, FALSE, 0, complain_overflow_bitfield, 0, "abs24", TRUE, 0x00ffffff, 0x00ffffff, FALSE),
  43     HOWTO (R_W65_ABS8S8,  0,  0, 8,  FALSE, 0, complain_overflow_bitfield, 0, ">abs8", TRUE, 0x000000ff, 0x000000ff, FALSE),
  44     HOWTO (R_W65_ABS8S16, 0,  0, 8,  FALSE, 0, complain_overflow_bitfield, 0, "^abs8", TRUE, 0x000000ff, 0x000000ff, FALSE),
  45     HOWTO (R_W65_ABS16S8, 1,  0, 16, FALSE, 0, complain_overflow_bitfield, 0, ">abs16", TRUE, 0x0000ffff, 0x0000ffff, FALSE),
  46     HOWTO (R_W65_ABS16S16,1,  0, 16, FALSE, 0, complain_overflow_bitfield, 0, "^abs16", TRUE, 0x0000ffff, 0x0000ffff, FALSE),
  47     HOWTO (R_W65_PCR8,    0,  0, 8,  FALSE, 0, complain_overflow_bitfield, 0, "pcrel8", TRUE, 0x000000ff, 0x000000ff, TRUE),
  48     HOWTO (R_W65_PCR16,   1,  0, 16, FALSE, 0, complain_overflow_bitfield, 0, "pcrel16", TRUE, 0x0000ffff, 0x0000ffff, TRUE),
  49     HOWTO (R_W65_DP,      0,  0, 8,  FALSE, 0, complain_overflow_bitfield, 0, "dp", TRUE, 0x000000ff, 0x000000ff, FALSE),
  50   };
  51
  52 /* Turn a howto into a reloc number.  */
  53
  54 #define SELECT_RELOC(x,howto) \
  55   { x.r_type = select_reloc(howto); }
  56
  57 #define BADMAG(x) (W65BADMAG(x))
  58 #define W65 1                   /* Customize coffcode.h */
  59 #define __A_MAGIC_SET__
  60
  61 /* Code to swap in the reloc */
  62 #define SWAP_IN_RELOC_OFFSET    H_GET_32
  63 #define SWAP_OUT_RELOC_OFFSET   H_PUT_32
  64 #define SWAP_OUT_RELOC_EXTRA(abfd, src, dst) \
  65   dst->r_stuff[0] = 'S'; \
  66   dst->r_stuff[1] = 'C';
  67
  68 static int
  69 select_reloc (howto)
  70      reloc_howto_type *howto;
  71 {
  72   return howto->type ;
  73 }
  74
  75 /* Code to turn a r_type into a howto ptr, uses the above howto table.  */
  76
  77 static void
  78 rtype2howto (internal, dst)
  79      arelent *internal;
  80      struct internal_reloc *dst;
  81 {
  82   internal->howto = howto_table + dst->r_type - 1;
  83 }
  84
  85 #define RTYPE2HOWTO(internal, relocentry) rtype2howto(internal,relocentry)
  86
  87 /* Perform any necessary magic to the addend in a reloc entry.  */
  88
  89 #define CALC_ADDEND(abfd, symbol, ext_reloc, cache_ptr) \
  90  cache_ptr->addend =  ext_reloc.r_offset;
  91
  92 #define RELOC_PROCESSING(relent,reloc,symbols,abfd,section) \
  93  reloc_processing(relent, reloc, symbols, abfd, section)
  94
  95 static void
  96 reloc_processing (relent, reloc, symbols, abfd, section)
  97      arelent * relent;
  98      struct internal_reloc *reloc;
  99      asymbol ** symbols;
 100      bfd * abfd;
 101      asection * section;
 102 {
 103   relent->address = reloc->r_vaddr;
 104   rtype2howto (relent, reloc);
 105
 106   if (((int) reloc->r_symndx) > 0)
 107     relent->sym_ptr_ptr = symbols + obj_convert (abfd)[reloc->r_symndx];
 108   else
 109     relent->sym_ptr_ptr = (asymbol **) bfd_abs_section_ptr->symbol_ptr_ptr;
 110
 111   relent->addend = reloc->r_offset;
 112
 113   relent->address -= section->vma;
 114   /*  relent->section = 0;*/
 115 }
 116
 117 static int
 118 w65_reloc16_estimate (abfd, input_section, reloc, shrink, link_info)
 119      bfd *abfd;
 120      asection *input_section;
 121      arelent *reloc;
 122      unsigned int shrink;
 123      struct bfd_link_info *link_info;
 124 {
 125   bfd_vma value;
 126   bfd_vma dot;
 127   bfd_vma gap;
 128
 129   /* The address of the thing to be relocated will have moved back by
 130    the size of the shrink  - but we don't change reloc->address here,
 131    since we need it to know where the relocation lives in the source
 132    uncooked section.  */
 133
 134   /*  reloc->address -= shrink;   conceptual */
 135
 136   bfd_vma address = reloc->address - shrink;
 137
 138   switch (reloc->howto->type)
 139     {
 140     case R_MOV16B2:
 141     case R_JMP2:
 142       shrink+=2;
 143       break;
 144
 145       /* Thing is a move one byte.  */
 146     case R_MOV16B1:
 147       value = bfd_coff_reloc16_get_value (reloc, link_info, input_section);
 148
 149       if (value >= 0xff00)
 150         {
 151           /* Change the reloc type from 16bit, possible 8 to 8bit
 152              possible 16.  */
 153           reloc->howto = reloc->howto + 1;
 154           /* The place to relc moves back by one.  */
 155           /* This will be two bytes smaller in the long run.  */
 156           shrink += 2;
 157           bfd_perform_slip (abfd, 2, input_section, address);
 158         }
 159
 160       break;
 161       /* This is the 24 bit branch which could become an 8 bitter,
 162          the relocation points to the first byte of the insn, not the
 163          actual data.  */
 164
 165     case R_JMPL1:
 166       value = bfd_coff_reloc16_get_value (reloc, link_info, input_section);
 167
 168       dot = input_section->output_section->vma +
 169         input_section->output_offset + address;
 170
 171       /* See if the address we're looking at within 127 bytes of where
 172          we are, if so then we can use a small branch rather than the
 173          jump we were going to.  */
 174       gap = value - dot;
 175
 176       if (-120 < (long) gap && (long) gap < 120)
 177         {
 178           /* Change the reloc type from 24bit, possible 8 to 8bit
 179              possible 32.  */
 180           reloc->howto = reloc->howto + 1;
 181           /* This will be two bytes smaller in the long run.  */
 182           shrink += 2;
 183           bfd_perform_slip (abfd, 2, input_section, address);
 184         }
 185       break;
 186
 187     case R_JMP1:
 188       value = bfd_coff_reloc16_get_value (reloc, link_info, input_section);
 189
 190       dot = input_section->output_section->vma +
 191         input_section->output_offset + address;
 192
 193       /* See if the address we're looking at within 127 bytes of where
 194          we are, if so then we can use a small branch rather than the
 195          jump we were going to.  */
 196       gap = value - (dot - shrink);
 197
 198       if (-120 < (long) gap && (long) gap < 120)
 199         {
 200           /* Change the reloc type from 16bit, possible 8 to 8bit
 201              possible 16.  */
 202           reloc->howto = reloc->howto + 1;
 203           /* The place to relc moves back by one.  */
 204
 205           /* This will be two bytes smaller in the long run.  */
 206           shrink += 2;
 207           bfd_perform_slip (abfd, 2, input_section, address);
 208         }
 209       break;
 210     }
 211
 212   return shrink;
 213 }
 214
 215 /* First phase of a relaxing link.  */
 216
 217 /* Reloc types
 218    large                small
 219    R_MOV16B1            R_MOV16B2       mov.b with 16bit or 8 bit address
 220    R_JMP1               R_JMP2          jmp or pcrel branch
 221    R_JMPL1              R_JMPL_B8       24jmp or pcrel branch
 222    R_MOV24B1            R_MOV24B2       24 or 8 bit reloc for mov.b  */
 223
 224 static void
 225 w65_reloc16_extra_cases (abfd, link_info, link_order, reloc, data, src_ptr,
 226                            dst_ptr)
 227      bfd *abfd;
 228      struct bfd_link_info *link_info;
 229      struct bfd_link_order *link_order;
 230      arelent *reloc;
 231      bfd_byte *data;
 232      unsigned int *src_ptr;
 233      unsigned int *dst_ptr;
 234 {
 235   unsigned int src_address = *src_ptr;
 236   unsigned int dst_address = *dst_ptr;
 237   asection *input_section = link_order->u.indirect.section;
 238
 239   switch (reloc->howto->type)
 240     {
 241     case R_W65_ABS8:
 242     case R_W65_DP:
 243       {
 244         unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
 245                                                        input_section);
 246         bfd_put_8 (abfd, gap, data + dst_address);
 247         dst_address += 1;
 248         src_address += 1;
 249       }
 250       break;
 251
 252     case R_W65_ABS8S8:
 253       {
 254         unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
 255                                                        input_section);
 256         gap >>= 8;
 257         bfd_put_8 (abfd, gap, data + dst_address);
 258         dst_address += 1;
 259         src_address += 1;
 260       }
 261       break;
 262
 263     case R_W65_ABS8S16:
 264       {
 265         unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
 266                                                        input_section);
 267         gap >>= 16;
 268         bfd_put_8 (abfd, gap, data + dst_address);
 269         dst_address += 1;
 270         src_address += 1;
 271       }
 272       break;
 273
 274     case R_W65_ABS16:
 275       {
 276         unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
 277                                                        input_section);
 278
 279         bfd_put_16 (abfd, (bfd_vma) gap, data + dst_address);
 280         dst_address += 2;
 281         src_address += 2;
 282       }
 283       break;
 284     case R_W65_ABS16S8:
 285       {
 286         unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
 287                                                        input_section);
 288         gap >>= 8;
 289         bfd_put_16 (abfd, (bfd_vma) gap, data + dst_address);
 290         dst_address += 2;
 291         src_address += 2;
 292       }
 293       break;
 294     case R_W65_ABS16S16:
 295       {
 296         unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
 297                                                        input_section);
 298         gap >>= 16;
 299         bfd_put_16 (abfd, (bfd_vma) gap, data + dst_address);
 300         dst_address += 2;
 301         src_address += 2;
 302       }
 303       break;
 304
 305     case R_W65_ABS24:
 306       {
 307         unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
 308                                                        input_section);
 309         bfd_put_16 (abfd, (bfd_vma) gap, data + dst_address);
 310         bfd_put_8 (abfd, gap >> 16, data+dst_address + 2);
 311         dst_address += 3;
 312         src_address += 3;
 313       }
 314       break;
 315
 316     case R_W65_PCR8:
 317       {
 318         int gap = bfd_coff_reloc16_get_value (reloc, link_info,
 319                                               input_section);
 320         bfd_vma dot = (dst_address
 321                        + input_section->output_offset
 322                        + input_section->output_section->vma);
 323
 324         gap -= dot + 1;
 325         if (gap < -128 || gap > 127)
 326           {
 327             if (! ((*link_info->callbacks->reloc_overflow)
 328                    (link_info, NULL,
 329                     bfd_asymbol_name (*reloc->sym_ptr_ptr),
 330                     reloc->howto->name, reloc->addend, input_section->owner,
 331                     input_section, reloc->address)))
 332               abort ();
 333           }
 334         bfd_put_8 (abfd, gap, data + dst_address);
 335         dst_address += 1;
 336         src_address += 1;
 337       }
 338       break;
 339
 340     case R_W65_PCR16:
 341       {
 342         bfd_vma gap = bfd_coff_reloc16_get_value (reloc, link_info,
 343                                                   input_section);
 344         bfd_vma dot = (dst_address
 345                        + input_section->output_offset
 346                        + input_section->output_section->vma);
 347
 348         /* This wraps within the page, so ignore the relativeness, look at the
 349            high part.  */
 350         if ((gap & 0xf0000) != (dot & 0xf0000))
 351           {
 352             if (! ((*link_info->callbacks->reloc_overflow)
 353                    (link_info, NULL,
 354                     bfd_asymbol_name (*reloc->sym_ptr_ptr),
 355                     reloc->howto->name, reloc->addend, input_section->owner,
 356                     input_section, reloc->address)))
 357               abort ();
 358           }
 359
 360         gap -= dot + 2;
 361         bfd_put_16 (abfd, gap, data + dst_address);
 362         dst_address += 2;
 363         src_address += 2;
 364       }
 365       break;
 366     default:
 367       printf (_("ignoring reloc %s\n"), reloc->howto->name);
 368       break;
 369
 370     }
 371   *src_ptr = src_address;
 372   *dst_ptr = dst_address;
 373 }
 374
 375 #define coff_reloc16_extra_cases w65_reloc16_extra_cases
 376 #define coff_reloc16_estimate w65_reloc16_estimate
 377
 378 #include "coffcode.h"
 379
 380 #undef coff_bfd_get_relocated_section_contents
 381 #undef coff_bfd_relax_section
 382 #define coff_bfd_get_relocated_section_contents \
 383   bfd_coff_reloc16_get_relocated_section_contents
 384 #define coff_bfd_relax_section bfd_coff_reloc16_relax_section
 385
 386 CREATE_LITTLE_COFF_TARGET_VEC (w65_vec, "coff-w65", BFD_IS_RELAXABLE, 0, '_', NULL, COFF_SWAP_TABLE)