bfd/coff-w65.c

   1 /* BFD back-end for WDC 65816 COFF binaries.
   2    Copyright 1995, 1996, 1997, 1999, 2000, 2001 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 static int  select_reloc              PARAMS ((reloc_howto_type *));
  30 static void rtype2howto               PARAMS ((arelent *, struct internal_reloc *));
  31 static void reloc_processing          PARAMS ((arelent *, struct internal_reloc *, asymbol **, bfd *, asection *));
  32 static int  w65_reloc16_estimate    PARAMS ((bfd *, asection *, arelent *, unsigned int, struct bfd_link_info *));
  33 static void w65_reloc16_extra_cases PARAMS ((bfd *,struct bfd_link_info *, struct bfd_link_order *, arelent *, bfd_byte *, unsigned int *, unsigned int *));
  34
  35 #define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (1)
  36 static reloc_howto_type howto_table[] =
  37   {
  38     HOWTO (R_W65_ABS8,    0,  0, 8,  false, 0, complain_overflow_bitfield, 0, "abs8", true, 0x000000ff, 0x000000ff, false),
  39     HOWTO (R_W65_ABS16,   1,  0, 16, false, 0, complain_overflow_bitfield, 0, "abs16", true, 0x0000ffff, 0x0000ffff, false),
  40     HOWTO (R_W65_ABS24,   0,  2, 32, false, 0, complain_overflow_bitfield, 0, "abs24", true, 0x00ffffff, 0x00ffffff, false),
  41     HOWTO (R_W65_ABS8S8,  0,  0, 8,  false, 0, complain_overflow_bitfield, 0, ">abs8", true, 0x000000ff, 0x000000ff, false),
  42     HOWTO (R_W65_ABS8S16, 0,  0, 8,  false, 0, complain_overflow_bitfield, 0, "^abs8", true, 0x000000ff, 0x000000ff, false),
  43     HOWTO (R_W65_ABS16S8, 1,  0, 16, false, 0, complain_overflow_bitfield, 0, ">abs16", true, 0x0000ffff, 0x0000ffff, false),
  44     HOWTO (R_W65_ABS16S16,1,  0, 16, false, 0, complain_overflow_bitfield, 0, "^abs16", true, 0x0000ffff, 0x0000ffff, false),
  45     HOWTO (R_W65_PCR8,    0,  0, 8,  false, 0, complain_overflow_bitfield, 0, "pcrel8", true, 0x000000ff, 0x000000ff, true),
  46     HOWTO (R_W65_PCR16,   1,  0, 16, false, 0, complain_overflow_bitfield, 0, "pcrel16", true, 0x0000ffff, 0x0000ffff, true),
  47     HOWTO (R_W65_DP,      0,  0, 8,  false, 0, complain_overflow_bitfield, 0, "dp", true, 0x000000ff, 0x000000ff, false),
  48   };
  49
  50 /* Turn a howto into a reloc number.  */
  51
  52 #define SELECT_RELOC(x,howto) \
  53   { x.r_type = select_reloc(howto); }
  54
  55 #define BADMAG(x) (W65BADMAG(x))
  56 #define W65 1                   /* Customize coffcode.h */
  57 #define __A_MAGIC_SET__
  58
  59 /* Code to swap in the reloc */
  60 #define SWAP_IN_RELOC_OFFSET    H_GET_32
  61 #define SWAP_OUT_RELOC_OFFSET   H_PUT_32
  62 #define SWAP_OUT_RELOC_EXTRA(abfd, src, dst) \
  63   dst->r_stuff[0] = 'S'; \
  64   dst->r_stuff[1] = 'C';
  65
  66 static int
  67 select_reloc (howto)
  68      reloc_howto_type *howto;
  69 {
  70   return howto->type ;
  71 }
  72
  73 /* Code to turn a r_type into a howto ptr, uses the above howto table.  */
  74
  75 static void
  76 rtype2howto (internal, dst)
  77      arelent *internal;
  78      struct internal_reloc *dst;
  79 {
  80   internal->howto = howto_table + dst->r_type - 1;
  81 }
  82
  83 #define RTYPE2HOWTO(internal, relocentry) rtype2howto(internal,relocentry)
  84
  85 /* Perform any necessary magic to the addend in a reloc entry.  */
  86
  87 #define CALC_ADDEND(abfd, symbol, ext_reloc, cache_ptr) \
  88  cache_ptr->addend =  ext_reloc.r_offset;
  89
  90 #define RELOC_PROCESSING(relent,reloc,symbols,abfd,section) \
  91  reloc_processing(relent, reloc, symbols, abfd, section)
  92
  93 static void
  94 reloc_processing (relent, reloc, symbols, abfd, section)
  95      arelent * relent;
  96      struct internal_reloc *reloc;
  97      asymbol ** symbols;
  98      bfd * abfd;
  99      asection * section;
 100 {
 101   relent->address = reloc->r_vaddr;
 102   rtype2howto (relent, reloc);
 103
 104   if (((int) reloc->r_symndx) > 0)
 105     relent->sym_ptr_ptr = symbols + obj_convert (abfd)[reloc->r_symndx];
 106   else
 107     relent->sym_ptr_ptr = (asymbol **)&(bfd_abs_symbol);
 108
 109   relent->addend = reloc->r_offset;
 110
 111   relent->address -= section->vma;
 112   /*  relent->section = 0;*/
 113 }
 114
 115 static int
 116 w65_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           /* Change the reloc type from 16bit, possible 8 to 8bit
 150              possible 16.  */
 151           reloc->howto = reloc->howto + 1;
 152           /* The place to relc moves back by one.  */
 153           /* This will be two bytes smaller in the long run.  */
 154           shrink += 2;
 155           bfd_perform_slip (abfd, 2, input_section, address);
 156         }
 157
 158       break;
 159       /* This is the 24 bit branch which could become an 8 bitter,
 160          the relocation points to the first byte of the insn, not the
 161          actual data.  */
 162
 163     case R_JMPL1:
 164       value = bfd_coff_reloc16_get_value (reloc, link_info, input_section);
 165
 166       dot = input_section->output_section->vma +
 167         input_section->output_offset + address;
 168
 169       /* See if the address we're looking at within 127 bytes of where
 170          we are, if so then we can use a small branch rather than the
 171          jump we were going to.  */
 172       gap = value - dot;
 173
 174       if (-120 < (long) gap && (long) gap < 120)
 175         {
 176           /* Change the reloc type from 24bit, possible 8 to 8bit
 177              possible 32.  */
 178           reloc->howto = reloc->howto + 1;
 179           /* This will be two bytes smaller in the long run.  */
 180           shrink += 2;
 181           bfd_perform_slip (abfd, 2, input_section, address);
 182         }
 183       break;
 184
 185     case R_JMP1:
 186       value = bfd_coff_reloc16_get_value (reloc, link_info, input_section);
 187
 188       dot = input_section->output_section->vma +
 189         input_section->output_offset + address;
 190
 191       /* See if the address we're looking at within 127 bytes of where
 192          we are, if so then we can use a small branch rather than the
 193          jump we were going to.  */
 194       gap = value - (dot - shrink);
 195
 196       if (-120 < (long) gap && (long) gap < 120)
 197         {
 198           /* Change the reloc type from 16bit, possible 8 to 8bit
 199              possible 16.  */
 200           reloc->howto = reloc->howto + 1;
 201           /* The place to relc moves back by one.  */
 202
 203           /* This will be two bytes smaller in the long run.  */
 204           shrink += 2;
 205           bfd_perform_slip (abfd, 2, input_section, address);
 206         }
 207       break;
 208     }
 209
 210   return shrink;
 211 }
 212
 213 /* First phase of a relaxing link.  */
 214
 215 /* Reloc types
 216    large                small
 217    R_MOV16B1            R_MOV16B2       mov.b with 16bit or 8 bit address
 218    R_JMP1               R_JMP2          jmp or pcrel branch
 219    R_JMPL1              R_JMPL_B8       24jmp or pcrel branch
 220    R_MOV24B1            R_MOV24B2       24 or 8 bit reloc for mov.b  */
 221
 222 static void
 223 w65_reloc16_extra_cases (abfd, link_info, link_order, reloc, data, src_ptr,
 224                            dst_ptr)
 225      bfd *abfd;
 226      struct bfd_link_info *link_info;
 227      struct bfd_link_order *link_order;
 228      arelent *reloc;
 229      bfd_byte *data;
 230      unsigned int *src_ptr;
 231      unsigned int *dst_ptr;
 232 {
 233   unsigned int src_address = *src_ptr;
 234   unsigned int dst_address = *dst_ptr;
 235   asection *input_section = link_order->u.indirect.section;
 236
 237   switch (reloc->howto->type)
 238     {
 239     case R_W65_ABS8:
 240     case R_W65_DP:
 241       {
 242         unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
 243                                                        input_section);
 244         bfd_put_8 (abfd, gap, data + dst_address);
 245         dst_address += 1;
 246         src_address += 1;
 247       }
 248       break;
 249
 250     case R_W65_ABS8S8:
 251       {
 252         unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
 253                                                        input_section);
 254         gap >>= 8;
 255         bfd_put_8 (abfd, gap, data + dst_address);
 256         dst_address += 1;
 257         src_address += 1;
 258       }
 259       break;
 260
 261     case R_W65_ABS8S16:
 262       {
 263         unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
 264                                                        input_section);
 265         gap >>= 16;
 266         bfd_put_8 (abfd, gap, data + dst_address);
 267         dst_address += 1;
 268         src_address += 1;
 269       }
 270       break;
 271
 272     case R_W65_ABS16:
 273       {
 274         unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
 275                                                        input_section);
 276
 277         bfd_put_16 (abfd, (bfd_vma) gap, data + dst_address);
 278         dst_address += 2;
 279         src_address += 2;
 280       }
 281       break;
 282     case R_W65_ABS16S8:
 283       {
 284         unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
 285                                                        input_section);
 286         gap >>= 8;
 287         bfd_put_16 (abfd, (bfd_vma) gap, data + dst_address);
 288         dst_address += 2;
 289         src_address += 2;
 290       }
 291       break;
 292     case R_W65_ABS16S16:
 293       {
 294         unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
 295                                                        input_section);
 296         gap >>= 16;
 297         bfd_put_16 (abfd, (bfd_vma) gap, data + dst_address);
 298         dst_address += 2;
 299         src_address += 2;
 300       }
 301       break;
 302
 303     case R_W65_ABS24:
 304       {
 305         unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,
 306                                                        input_section);
 307         bfd_put_16 (abfd, (bfd_vma) gap, data + dst_address);
 308         bfd_put_8 (abfd, gap >> 16, data+dst_address + 2);
 309         dst_address += 3;
 310         src_address += 3;
 311       }
 312       break;
 313
 314     case R_W65_PCR8:
 315       {
 316         int gap = bfd_coff_reloc16_get_value (reloc, link_info,
 317                                               input_section);
 318         bfd_vma dot = link_order->offset
 319           + dst_address
 320             + link_order->u.indirect.section->output_section->vma;
 321
 322         gap -= dot + 1;
 323         if (gap < -128 || gap > 127)
 324           {
 325             if (! ((*link_info->callbacks->reloc_overflow)
 326                    (link_info, bfd_asymbol_name (*reloc->sym_ptr_ptr),
 327                     reloc->howto->name, reloc->addend, input_section->owner,
 328                     input_section, reloc->address)))
 329               abort ();
 330           }
 331         bfd_put_8 (abfd, gap, data + dst_address);
 332         dst_address += 1;
 333         src_address += 1;
 334       }
 335       break;
 336
 337     case R_W65_PCR16:
 338       {
 339         bfd_vma gap = bfd_coff_reloc16_get_value (reloc, link_info,
 340                                                   input_section);
 341         bfd_vma dot = link_order->offset
 342           + dst_address
 343             + link_order->u.indirect.section->output_section->vma;
 344
 345         /* This wraps within the page, so ignore the relativeness, look at the
 346            high part.  */
 347         if ((gap & 0xf0000) != (dot & 0xf0000))
 348           {
 349             if (! ((*link_info->callbacks->reloc_overflow)
 350                    (link_info, bfd_asymbol_name (*reloc->sym_ptr_ptr),
 351                     reloc->howto->name, reloc->addend, input_section->owner,
 352                     input_section, reloc->address)))
 353               abort ();
 354           }
 355
 356         gap -= dot + 2;
 357         bfd_put_16 (abfd, gap, data + dst_address);
 358         dst_address += 2;
 359         src_address += 2;
 360       }
 361       break;
 362     default:
 363       printf (_("ignoring reloc %s\n"), reloc->howto->name);
 364       break;
 365
 366     }
 367   *src_ptr = src_address;
 368   *dst_ptr = dst_address;
 369 }
 370
 371 #define coff_reloc16_extra_cases w65_reloc16_extra_cases
 372 #define coff_reloc16_estimate w65_reloc16_estimate
 373
 374 #include "coffcode.h"
 375
 376 #undef coff_bfd_get_relocated_section_contents
 377 #undef coff_bfd_relax_section
 378 #define coff_bfd_get_relocated_section_contents \
 379   bfd_coff_reloc16_get_relocated_section_contents
 380 #define coff_bfd_relax_section bfd_coff_reloc16_relax_section
 381
 382 CREATE_LITTLE_COFF_TARGET_VEC (w65_vec, "coff-w65", BFD_IS_RELAXABLE, 0, '_', NULL)