gnu/dist/gdb6/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 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 2 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, MA 02110-1301, USA.  */
  21
  22 #include "bfd.h"
  23 #include "sysdep.h"
  24 #include "libbfd.h"
  25 #include "bfdlink.h"
  26 #include "coff/w65.h"
  27 #include "coff/internal.h"
  28 #include "libcoff.h"
  29
  30 static int  select_reloc              PARAMS ((reloc_howto_type *));
  31 static void rtype2howto               PARAMS ((arelent *, struct internal_reloc *));
  32 static void reloc_processing          PARAMS ((arelent *, struct internal_reloc *, asymbol **, bfd *, asection *));
  33 static int  w65_reloc16_estimate    PARAMS ((bfd *, asection *, arelent *, unsigned int, struct bfd_link_info *));
  34 static void w65_reloc16_extra_cases PARAMS ((bfd *,struct bfd_link_info *, struct bfd_link_order *, arelent *, bfd_byte *, unsigned int *, unsigned int *));
  35
  36 #define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (1)
  37 static reloc_howto_type howto_table[] =
  38   {
  39     HOWTO (R_W65_ABS8,    0,  0, 8,  FALSE, 0, complain_overflow_bitfield, 0, "abs8", TRUE, 0x000000ff, 0x000000ff, FALSE),
  40     HOWTO (R_W65_ABS16,   1,  0, 16, FALSE, 0, complain_overflow_bitfield, 0, "abs16", TRUE, 0x0000ffff, 0x0000ffff, FALSE),
  41     HOWTO (R_W65_ABS24,   0,  2, 32, FALSE, 0, complain_overflow_bitfield, 0, "abs24", TRUE, 0x00ffffff, 0x00ffffff, FALSE),
  42     HOWTO (R_W65_ABS8S8,  0,  0, 8,  FALSE, 0, complain_overflow_bitfield, 0, ">abs8", TRUE, 0x000000ff, 0x000000ff, FALSE),
  43     HOWTO (R_W65_ABS8S16, 0,  0, 8,  FALSE, 0, complain_overflow_bitfield, 0, "^abs8", TRUE, 0x000000ff, 0x000000ff, FALSE),
  44     HOWTO (R_W65_ABS16S8, 1,  0, 16, FALSE, 0, complain_overflow_bitfield, 0, ">abs16", TRUE, 0x0000ffff, 0x0000ffff, FALSE),
  45     HOWTO (R_W65_ABS16S16,1,  0, 16, FALSE, 0, complain_overflow_bitfield, 0, "^abs16", TRUE, 0x0000ffff, 0x0000ffff, FALSE),
  46     HOWTO (R_W65_PCR8,    0,  0, 8,  FALSE, 0, complain_overflow_bitfield, 0, "pcrel8", TRUE, 0x000000ff, 0x000000ff, TRUE),
  47     HOWTO (R_W65_PCR16,   1,  0, 16, FALSE, 0, complain_overflow_bitfield, 0, "pcrel16", TRUE, 0x0000ffff, 0x0000ffff, TRUE),
  48     HOWTO (R_W65_DP,      0,  0, 8,  FALSE, 0, complain_overflow_bitfield, 0, "dp", TRUE, 0x000000ff, 0x000000ff, FALSE),
  49   };
  50
  51 /* Turn a howto into a reloc number.  */
  52
  53 #define SELECT_RELOC(x,howto) \
  54   { x.r_type = select_reloc(howto); }
  55
  56 #define BADMAG(x) (W65BADMAG(x))
  57 #define W65 1                   /* Customize coffcode.h */
  58 #define __A_MAGIC_SET__
  59
  60 /* Code to swap in the reloc */
  61 #define SWAP_IN_RELOC_OFFSET    H_GET_32
  62 #define SWAP_OUT_RELOC_OFFSET   H_PUT_32
  63 #define SWAP_OUT_RELOC_EXTRA(abfd, src, dst) \
  64   dst->r_stuff[0] = 'S'; \
  65   dst->r_stuff[1] = 'C';
  66
  67 static int
  68 select_reloc (howto)
  69      reloc_howto_type *howto;
  70 {
  71   return howto->type ;
  72 }
  73
  74 /* Code to turn a r_type into a howto ptr, uses the above howto table.  */
  75
  76 static void
  77 rtype2howto (internal, dst)
  78      arelent *internal;
  79      struct internal_reloc *dst;
  80 {
  81   internal->howto = howto_table + dst->r_type - 1;
  82 }
  83
  84 #define RTYPE2HOWTO(internal, relocentry) rtype2howto(internal,relocentry)
  85
  86 /* Perform any necessary magic to the addend in a reloc entry.  */
  87
  88 #define CALC_ADDEND(abfd, symbol, ext_reloc, cache_ptr) \
  89  cache_ptr->addend =  ext_reloc.r_offset;
  90
  91 #define RELOC_PROCESSING(relent,reloc,symbols,abfd,section) \
  92  reloc_processing(relent, reloc, symbols, abfd, section)
  93
  94 static void
  95 reloc_processing (relent, reloc, symbols, abfd, section)
  96      arelent * relent;
  97      struct internal_reloc *reloc;
  98      asymbol ** symbols;
  99      bfd * abfd;
 100      asection * section;
 101 {
 102   relent->address = reloc->r_vaddr;
 103   rtype2howto (relent, reloc);
 104
 105   if (((int) reloc->r_symndx) > 0)
 106     relent->sym_ptr_ptr = symbols + obj_convert (abfd)[reloc->r_symndx];
 107   else
 108     relent->sym_ptr_ptr = (asymbol **) bfd_abs_section_ptr->symbol_ptr_ptr;
 109
 110   relent->addend = reloc->r_offset;
 111
 112   relent->address -= section->vma;
 113   /*  relent->section = 0;*/
 114 }
 115
 116 static int
 117 w65_reloc16_estimate (abfd, input_section, reloc, shrink, link_info)
 118      bfd *abfd;
 119      asection *input_section;
 120      arelent *reloc;
 121      unsigned int shrink;
 122      struct bfd_link_info *link_info;
 123 {
 124   bfd_vma value;
 125   bfd_vma dot;
 126   bfd_vma gap;
 127
 128   /* The address of the thing to be relocated will have moved back by
 129    the size of the shrink  - but we don't change reloc->address here,
 130    since we need it to know where the relocation lives in the source
 131    uncooked section.  */
 132
 133   /*  reloc->address -= shrink;   conceptual */
 134
 135   bfd_vma address = reloc->address - shrink;
 136
 137   switch (reloc->howto->type)
 138     {
 139     case R_MOV16B2:
 140     case R_JMP2:
 141       shrink+=2;
 142       break;
 143
 144       /* Thing is a move one byte.  */
 145     case R_MOV16B1:
 146       value = bfd_coff_reloc16_get_value (reloc, link_info, input_section);
 147
 148       if (value >= 0xff00)
 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       gap = value - dot;
 174
 175       if (-120 < (long) gap && (long) gap < 120)
 176         {
 177           /* Change the reloc type from 24bit, possible 8 to 8bit
 178              possible 32.  */
 179           reloc->howto = reloc->howto + 1;
 180           /* This will be two bytes smaller in the long run.  */
 181           shrink += 2;
 182           bfd_perform_slip (abfd, 2, input_section, address);
 183         }
 184       break;
 185
 186     case R_JMP1:
 187       value = bfd_coff_reloc16_get_value (reloc, link_info, input_section);
 188
 189       dot = input_section->output_section->vma +
 190         input_section->output_offset + address;
 191
 192       /* See if the address we're looking at within 127 bytes of where
 193          we are, if so then we can use a small branch rather than the
 194          jump we were going to.  */
 195       gap = value - (dot - shrink);
 196
 197       if (-120 < (long) gap && (long) gap < 120)
 198         {
 199           /* Change the reloc type from 16bit, possible 8 to 8bit
 200              possible 16.  */
 201           reloc->howto = reloc->howto + 1;
 202           /* The place to relc moves back by one.  */
 203
 204           /* This will be two bytes smaller in the long run.  */
 205           shrink += 2;
 206           bfd_perform_slip (abfd, 2, input_section, address);
 207         }
 208       break;
 209     }
 210
 211   return shrink;
 212 }
 213
 214 /* First phase of a relaxing link.  */
 215
 216 /* Reloc types
 217    large                small
 218    R_MOV16B1            R_MOV16B2       mov.b with 16bit or 8 bit address
 219    R_JMP1               R_JMP2          jmp or pcrel branch
 220    R_JMPL1              R_JMPL_B8       24jmp or pcrel branch
 221    R_MOV24B1            R_MOV24B2       24 or 8 bit reloc for mov.b  */
 222
 223 static void
 224 w65_reloc16_extra_cases (abfd, link_info, link_order, reloc, data, src_ptr,
 225                            dst_ptr)
 226      bfd *abfd;
 227      struct bfd_link_info *link_info;
 228      struct bfd_link_order *link_order;
 229      arelent *reloc;
 230      bfd_byte *data;
 231      unsigned int *src_ptr;
 232      unsigned int *dst_ptr;
 233 {
 234   unsigned int src_address = *src_ptr;
 235   unsigned int dst_address = *dst_ptr;
 236   asection *input_section = link_order->u.indirect.section;
 237
 238   switch (reloc->howto->type)
 239     {
 240     case R_W65_ABS8:
 241     case R_W65_DP:
 242       {
 243         unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
 244                                                        input_section);
 245         bfd_put_8 (abfd, gap, data + dst_address);
 246         dst_address += 1;
 247         src_address += 1;
 248       }
 249       break;
 250
 251     case R_W65_ABS8S8:
 252       {
 253         unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
 254                                                        input_section);
 255         gap >>= 8;
 256         bfd_put_8 (abfd, gap, data + dst_address);
 257         dst_address += 1;
 258         src_address += 1;
 259       }
 260       break;
 261
 262     case R_W65_ABS8S16:
 263       {
 264         unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
 265                                                        input_section);
 266         gap >>= 16;
 267         bfd_put_8 (abfd, gap, data + dst_address);
 268         dst_address += 1;
 269         src_address += 1;
 270       }
 271       break;
 272
 273     case R_W65_ABS16:
 274       {
 275         unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
 276                                                        input_section);
 277
 278         bfd_put_16 (abfd, (bfd_vma) gap, data + dst_address);
 279         dst_address += 2;
 280         src_address += 2;
 281       }
 282       break;
 283     case R_W65_ABS16S8:
 284       {
 285         unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
 286                                                        input_section);
 287         gap >>= 8;
 288         bfd_put_16 (abfd, (bfd_vma) gap, data + dst_address);
 289         dst_address += 2;
 290         src_address += 2;
 291       }
 292       break;
 293     case R_W65_ABS16S16:
 294       {
 295         unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
 296                                                        input_section);
 297         gap >>= 16;
 298         bfd_put_16 (abfd, (bfd_vma) gap, data + dst_address);
 299         dst_address += 2;
 300         src_address += 2;
 301       }
 302       break;
 303
 304     case R_W65_ABS24:
 305       {
 306         unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
 307                                                        input_section);
 308         bfd_put_16 (abfd, (bfd_vma) gap, data + dst_address);
 309         bfd_put_8 (abfd, gap >> 16, data+dst_address + 2);
 310         dst_address += 3;
 311         src_address += 3;
 312       }
 313       break;
 314
 315     case R_W65_PCR8:
 316       {
 317         int gap = bfd_coff_reloc16_get_value (reloc, link_info,
 318                                               input_section);
 319         bfd_vma dot = (dst_address
 320                        + input_section->output_offset
 321                        + input_section->output_section->vma);
 322
 323         gap -= dot + 1;
 324         if (gap < -128 || gap > 127)
 325           {
 326             if (! ((*link_info->callbacks->reloc_overflow)
 327                    (link_info, NULL,
 328                     bfd_asymbol_name (*reloc->sym_ptr_ptr),
 329                     reloc->howto->name, reloc->addend, input_section->owner,
 330                     input_section, reloc->address)))
 331               abort ();
 332           }
 333         bfd_put_8 (abfd, gap, data + dst_address);
 334         dst_address += 1;
 335         src_address += 1;
 336       }
 337       break;
 338
 339     case R_W65_PCR16:
 340       {
 341         bfd_vma gap = bfd_coff_reloc16_get_value (reloc, link_info,
 342                                                   input_section);
 343         bfd_vma dot = (dst_address
 344                        + input_section->output_offset
 345                        + input_section->output_section->vma);
 346
 347         /* This wraps within the page, so ignore the relativeness, look at the
 348            high part.  */
 349         if ((gap & 0xf0000) != (dot & 0xf0000))
 350           {
 351             if (! ((*link_info->callbacks->reloc_overflow)
 352                    (link_info, NULL,
 353                     bfd_asymbol_name (*reloc->sym_ptr_ptr),
 354                     reloc->howto->name, reloc->addend, input_section->owner,
 355                     input_section, reloc->address)))
 356               abort ();
 357           }
 358
 359         gap -= dot + 2;
 360         bfd_put_16 (abfd, gap, data + dst_address);
 361         dst_address += 2;
 362         src_address += 2;
 363       }
 364       break;
 365     default:
 366       printf (_("ignoring reloc %s\n"), reloc->howto->name);
 367       break;
 368
 369     }
 370   *src_ptr = src_address;
 371   *dst_ptr = dst_address;
 372 }
 373
 374 #define coff_reloc16_extra_cases w65_reloc16_extra_cases
 375 #define coff_reloc16_estimate w65_reloc16_estimate
 376
 377 #include "coffcode.h"
 378
 379 #undef coff_bfd_get_relocated_section_contents
 380 #undef coff_bfd_relax_section
 381 #define coff_bfd_get_relocated_section_contents \
 382   bfd_coff_reloc16_get_relocated_section_contents
 383 #define coff_bfd_relax_section bfd_coff_reloc16_relax_section
 384
 385 CREATE_LITTLE_COFF_TARGET_VEC (w65_vec, "coff-w65", BFD_IS_RELAXABLE, 0, '_', NULL, COFF_SWAP_TABLE)