bfd/aout-ns32k.c

   1 /* BFD back-end for ns32k a.out-ish binaries.
   2    Copyright (C) 1990-2019 Free Software Foundation, Inc.
   3    Contributed by Ian Dall (idall@eleceng.adelaide.edu.au).
   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 3 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., 51 Franklin Street - Fifth Floor, Boston,
  20    MA 02110-1301, USA.  */
  21
  22 #include "sysdep.h"
  23 #include "bfd.h"
  24 #include "aout/aout64.h"
  25 #include "ns32k.h"
  26
  27 /* Do not "beautify" the CONCAT* macro args.  Traditional C will not
  28    remove whitespace added here, and thus will fail to concatenate
  29    the tokens.  */
  30 #define MYNS(OP) CONCAT2 (ns32k_aout_,OP)
  31
  32 reloc_howto_type * MYNS (bfd_reloc_type_lookup) (bfd *, bfd_reloc_code_real_type);
  33 reloc_howto_type * MYNS (bfd_reloc_name_lookup) (bfd *, const char *);
  34 bfd_boolean        MYNS (write_object_contents) (bfd *);
  35
  36 /* Avoid multiple definitions from aoutx if supporting
  37    standard a.out format(s) as well as this one.  */
  38 #define NAME(x,y) CONCAT3 (ns32kaout,_32_,y)
  39
  40 void bfd_ns32k_arch (void);
  41
  42 #include "libaout.h"
  43
  44 #define MY(OP) MYNS (OP)
  45
  46 #define MY_swap_std_reloc_in   MY (swap_std_reloc_in)
  47 #define MY_swap_std_reloc_out  MY (swap_std_reloc_out)
  48
  49 /* The ns32k series is ah, unusual, when it comes to relocation.
  50    There are three storage methods for relocatable objects.  There
  51    are displacements, immediate operands and ordinary twos complement
  52    data. Of these, only the last fits into the standard relocation
  53    scheme.  Immediate operands are stored huffman encoded and
  54    immediate operands are stored big endian (where as the natural byte
  55    order is little endian for this architecture).
  56
  57    Note that the ns32k displacement storage method is orthogonal to
  58    whether the relocation is pc relative or not. The "displacement"
  59    storage scheme is used for essentially all address constants. The
  60    displacement can be relative to zero (absolute displacement),
  61    relative to the pc (pc relative), the stack pointer, the frame
  62    pointer, the static base register and general purpose register etc.
  63
  64    For example:
  65
  66    sym1: .long .         # pc relative 2's complement
  67    sym1: .long foo       # 2's complement not pc relative
  68
  69    self:  movd @self, r0 # pc relative displacement
  70           movd foo, r0   # non pc relative displacement
  71
  72    self:  movd self, r0  # pc relative immediate
  73           movd foo, r0   # non pc relative immediate
  74
  75    In addition, for historical reasons the encoding of the relocation types
  76    in the a.out format relocation entries is such that even the relocation
  77    methods which are standard are not encoded the standard way.  */
  78
  79 reloc_howto_type MY (howto_table)[] =
  80 {
  81   /* ns32k immediate operands.  */
  82   HOWTO (BFD_RELOC_NS32K_IMM_8, 0, 0, 8, FALSE, 0, complain_overflow_signed,
  83          _bfd_ns32k_reloc_imm, "NS32K_IMM_8",
  84          TRUE, 0x000000ff,0x000000ff, FALSE),
  85   HOWTO (BFD_RELOC_NS32K_IMM_16, 0, 1, 16, FALSE, 0, complain_overflow_signed,
  86          _bfd_ns32k_reloc_imm,  "NS32K_IMM_16",
  87          TRUE, 0x0000ffff,0x0000ffff, FALSE),
  88   HOWTO (BFD_RELOC_NS32K_IMM_32, 0, 2, 32, FALSE, 0, complain_overflow_signed,
  89          _bfd_ns32k_reloc_imm, "NS32K_IMM_32",
  90          TRUE, 0xffffffff,0xffffffff, FALSE),
  91   HOWTO (BFD_RELOC_NS32K_IMM_8_PCREL, 0, 0, 8, TRUE, 0, complain_overflow_signed,
  92          _bfd_ns32k_reloc_imm, "PCREL_NS32K_IMM_8",
  93          TRUE, 0x000000ff, 0x000000ff, FALSE),
  94   HOWTO (BFD_RELOC_NS32K_IMM_16_PCREL, 0, 1, 16, TRUE, 0, complain_overflow_signed,
  95          _bfd_ns32k_reloc_imm, "PCREL_NS32K_IMM_16",
  96          TRUE, 0x0000ffff,0x0000ffff, FALSE),
  97   HOWTO (BFD_RELOC_NS32K_IMM_32_PCREL, 0, 2, 32, TRUE, 0, complain_overflow_signed,
  98          _bfd_ns32k_reloc_imm, "PCREL_NS32K_IMM_32",
  99          TRUE, 0xffffffff,0xffffffff, FALSE),
 100
 101   /* ns32k displacements.  */
 102   HOWTO (BFD_RELOC_NS32K_DISP_8, 0, 0, 7, FALSE, 0, complain_overflow_signed,
 103          _bfd_ns32k_reloc_disp, "NS32K_DISP_8",
 104          TRUE, 0x000000ff,0x000000ff, FALSE),
 105   HOWTO (BFD_RELOC_NS32K_DISP_16, 0, 1, 14, FALSE, 0, complain_overflow_signed,
 106          _bfd_ns32k_reloc_disp, "NS32K_DISP_16",
 107          TRUE, 0x0000ffff, 0x0000ffff, FALSE),
 108   HOWTO (BFD_RELOC_NS32K_DISP_32, 0, 2, 30, FALSE, 0, complain_overflow_signed,
 109          _bfd_ns32k_reloc_disp, "NS32K_DISP_32",
 110          TRUE, 0xffffffff, 0xffffffff, FALSE),
 111   HOWTO (BFD_RELOC_NS32K_DISP_8_PCREL, 0, 0, 7, TRUE, 0, complain_overflow_signed,
 112            _bfd_ns32k_reloc_disp, "PCREL_NS32K_DISP_8",
 113          TRUE, 0x000000ff,0x000000ff, FALSE),
 114   HOWTO (BFD_RELOC_NS32K_DISP_16_PCREL, 0, 1, 14, TRUE, 0, complain_overflow_signed,
 115          _bfd_ns32k_reloc_disp, "PCREL_NS32K_DISP_16",
 116          TRUE, 0x0000ffff,0x0000ffff, FALSE),
 117   HOWTO (BFD_RELOC_NS32K_DISP_32_PCREL, 0, 2, 30, TRUE, 0, complain_overflow_signed,
 118          _bfd_ns32k_reloc_disp, "PCREL_NS32K_DISP_32",
 119          TRUE, 0xffffffff,0xffffffff, FALSE),
 120
 121   /* Normal 2's complement.  */
 122   HOWTO (BFD_RELOC_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,0,
 123          "8", TRUE, 0x000000ff,0x000000ff, FALSE),
 124   HOWTO (BFD_RELOC_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,0,
 125          "16", TRUE, 0x0000ffff,0x0000ffff, FALSE),
 126   HOWTO (BFD_RELOC_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,0,
 127          "32", TRUE, 0xffffffff,0xffffffff, FALSE),
 128   HOWTO (BFD_RELOC_8_PCREL, 0, 0, 8, TRUE, 0, complain_overflow_signed, 0,
 129          "PCREL_8", TRUE, 0x000000ff,0x000000ff, FALSE),
 130   HOWTO (BFD_RELOC_16_PCREL, 0, 1, 16, TRUE, 0, complain_overflow_signed, 0,
 131          "PCREL_16", TRUE, 0x0000ffff,0x0000ffff, FALSE),
 132   HOWTO (BFD_RELOC_32_PCREL, 0, 2, 32, TRUE, 0, complain_overflow_signed, 0,
 133          "PCREL_32", TRUE, 0xffffffff,0xffffffff, FALSE),
 134 };
 135
 136 #define CTOR_TABLE_RELOC_HOWTO(BFD) (MY (howto_table) + 14)
 137
 138 #define RELOC_STD_BITS_NS32K_TYPE_BIG           0x06
 139 #define RELOC_STD_BITS_NS32K_TYPE_LITTLE        0x60
 140 #define RELOC_STD_BITS_NS32K_TYPE_SH_BIG        1
 141 #define RELOC_STD_BITS_NS32K_TYPE_SH_LITTLE     5
 142
 143 static reloc_howto_type *
 144 MY (reloc_howto) (bfd *abfd ATTRIBUTE_UNUSED,
 145                   struct reloc_std_external *rel,
 146                   int *r_index,
 147                   int *r_extern,
 148                   int *r_pcrel)
 149 {
 150   unsigned int r_length;
 151   int r_ns32k_type;
 152
 153   *r_index =  ((rel->r_index[2] << 16)
 154                | (rel->r_index[1] << 8)
 155                |  rel->r_index[0] );
 156   *r_extern  = (0 != (rel->r_type[0] & RELOC_STD_BITS_EXTERN_LITTLE));
 157   *r_pcrel   = (0 != (rel->r_type[0] & RELOC_STD_BITS_PCREL_LITTLE));
 158   r_length  =  ((rel->r_type[0] & RELOC_STD_BITS_LENGTH_LITTLE)
 159                 >> RELOC_STD_BITS_LENGTH_SH_LITTLE);
 160   r_ns32k_type  =  ((rel->r_type[0] & RELOC_STD_BITS_NS32K_TYPE_LITTLE)
 161                     >> RELOC_STD_BITS_NS32K_TYPE_SH_LITTLE);
 162   return (MY (howto_table) + r_length + 3 * (*r_pcrel) + 6 * r_ns32k_type);
 163 }
 164
 165 #define MY_reloc_howto(BFD, REL, IN, EX, PC) \
 166   MY (reloc_howto) (BFD, REL, &IN, &EX, &PC)
 167
 168 static void
 169 MY (put_reloc) (bfd *abfd,
 170                 int r_extern,
 171                 int r_index,
 172                 bfd_vma value,
 173                 reloc_howto_type *howto,
 174                 struct reloc_std_external *reloc)
 175 {
 176   unsigned int r_length;
 177   int r_pcrel;
 178   int r_ns32k_type;
 179
 180   PUT_WORD (abfd, value, reloc->r_address);
 181   r_length = howto->size ;      /* Size as a power of two.  */
 182   r_pcrel  = (int) howto->pc_relative; /* Relative to PC?  */
 183   r_ns32k_type = (howto - MY (howto_table) )/6;
 184
 185   reloc->r_index[2] = r_index >> 16;
 186   reloc->r_index[1] = r_index >> 8;
 187   reloc->r_index[0] = r_index;
 188   reloc->r_type[0] =
 189     (r_extern?    RELOC_STD_BITS_EXTERN_LITTLE: 0)
 190       | (r_pcrel?     RELOC_STD_BITS_PCREL_LITTLE: 0)
 191         | (r_length <<  RELOC_STD_BITS_LENGTH_SH_LITTLE)
 192           | (r_ns32k_type <<  RELOC_STD_BITS_NS32K_TYPE_SH_LITTLE);
 193 }
 194
 195 #define MY_put_reloc(BFD, EXT, IDX, VAL, HOWTO, RELOC) \
 196   MY (put_reloc) (BFD, EXT, IDX, VAL, HOWTO, RELOC)
 197
 198 #define STAT_FOR_EXEC
 199
 200 #define MY_final_link_relocate _bfd_ns32k_final_link_relocate
 201 #define MY_relocate_contents   _bfd_ns32k_relocate_contents
 202
 203 static void MY_swap_std_reloc_in (bfd *, struct reloc_std_external *, arelent *, asymbol **, bfd_size_type);
 204 static void MY_swap_std_reloc_out (bfd *, arelent *, struct reloc_std_external *);
 205
 206 #include "aoutx.h"
 207
 208 reloc_howto_type *
 209 MY (bfd_reloc_type_lookup) (bfd *abfd, bfd_reloc_code_real_type code)
 210 {
 211 #define ENTRY(i,j)      case i: return &MY (howto_table)[j]
 212
 213   int ext = obj_reloc_entry_size (abfd) == RELOC_EXT_SIZE;
 214
 215   BFD_ASSERT (ext == 0);
 216   if (code == BFD_RELOC_CTOR)
 217     switch (bfd_arch_bits_per_address (abfd))
 218       {
 219       case 32:
 220         code = BFD_RELOC_32;
 221         break;
 222       default:
 223         break;
 224       }
 225   switch (code)
 226     {
 227       ENTRY (BFD_RELOC_NS32K_IMM_8, 0);
 228       ENTRY (BFD_RELOC_NS32K_IMM_16, 1);
 229       ENTRY (BFD_RELOC_NS32K_IMM_32, 2);
 230       ENTRY (BFD_RELOC_NS32K_IMM_8_PCREL, 3);
 231       ENTRY (BFD_RELOC_NS32K_IMM_16_PCREL, 4);
 232       ENTRY (BFD_RELOC_NS32K_IMM_32_PCREL, 5);
 233       ENTRY (BFD_RELOC_NS32K_DISP_8, 6);
 234       ENTRY (BFD_RELOC_NS32K_DISP_16, 7);
 235       ENTRY (BFD_RELOC_NS32K_DISP_32, 8);
 236       ENTRY (BFD_RELOC_NS32K_DISP_8_PCREL, 9);
 237       ENTRY (BFD_RELOC_NS32K_DISP_16_PCREL, 10);
 238       ENTRY (BFD_RELOC_NS32K_DISP_32_PCREL, 11);
 239       ENTRY (BFD_RELOC_8, 12);
 240       ENTRY (BFD_RELOC_16, 13);
 241       ENTRY (BFD_RELOC_32, 14);
 242       ENTRY (BFD_RELOC_8_PCREL, 15);
 243       ENTRY (BFD_RELOC_16_PCREL, 16);
 244       ENTRY (BFD_RELOC_32_PCREL, 17);
 245     default:
 246       return NULL;
 247     }
 248 #undef ENTRY
 249 }
 250
 251 reloc_howto_type *
 252 MY (bfd_reloc_name_lookup) (bfd *abfd ATTRIBUTE_UNUSED,
 253                             const char *r_name)
 254 {
 255   unsigned int i;
 256
 257   for (i = 0;
 258        i < sizeof (MY (howto_table)) / sizeof (MY (howto_table)[0]);
 259        i++)
 260     if (MY (howto_table)[i].name != NULL
 261         && strcasecmp (MY (howto_table)[i].name, r_name) == 0)
 262       return &MY (howto_table)[i];
 263
 264   return NULL;
 265 }
 266
 267 static void
 268 MY_swap_std_reloc_in (bfd *abfd,
 269                       struct reloc_std_external *bytes,
 270                       arelent *cache_ptr,
 271                       asymbol **symbols,
 272                       bfd_size_type symcount ATTRIBUTE_UNUSED)
 273 {
 274   int r_index;
 275   int r_extern;
 276   int r_pcrel;
 277   struct aoutdata  *su = &(abfd->tdata.aout_data->a);
 278
 279   cache_ptr->address = H_GET_32 (abfd, bytes->r_address);
 280
 281   /* Now the fun stuff.  */
 282   cache_ptr->howto = MY_reloc_howto (abfd, bytes, r_index, r_extern, r_pcrel);
 283
 284   MOVE_ADDRESS (0);
 285 }
 286
 287 static void
 288 MY_swap_std_reloc_out (bfd *abfd,
 289                        arelent *g,
 290                        struct reloc_std_external *natptr)
 291 {
 292   int r_index;
 293   asymbol *sym = *(g->sym_ptr_ptr);
 294   int r_extern;
 295   asection *output_section = sym->section->output_section;
 296
 297   /* Name was clobbered by aout_write_syms to be symbol index.  */
 298
 299   /* If this relocation is relative to a symbol then set the
 300      r_index to the symbols index, and the r_extern bit.
 301
 302      Absolute symbols can come in in two ways, either as an offset
 303      from the abs section, or as a symbol which has an abs value.
 304      Check for that here.  */
 305   if (bfd_is_com_section (output_section)
 306       || bfd_is_abs_section (output_section)
 307       || bfd_is_und_section (output_section))
 308     {
 309       if (bfd_abs_section_ptr->symbol == sym)
 310         {
 311           /* Whoops, looked like an abs symbol, but is really an offset
 312              from the abs section.  */
 313           r_index = 0;
 314           r_extern = 0;
 315         }
 316       else
 317         {
 318           /* Fill in symbol.  */
 319           r_extern = 1;
 320 #undef KEEPIT
 321 #define KEEPIT udata.i
 322           r_index =  (*(g->sym_ptr_ptr))->KEEPIT;
 323 #undef KEEPIT
 324         }
 325     }
 326   else
 327     {
 328       /* Just an ordinary section.  */
 329       r_extern = 0;
 330       r_index  = output_section->target_index;
 331     }
 332
 333   MY_put_reloc (abfd, r_extern, r_index, g->address, g->howto, natptr);
 334 }
 335
 336 bfd_reloc_status_type
 337 _bfd_ns32k_relocate_contents (reloc_howto_type *howto,
 338                               bfd *input_bfd,
 339                               bfd_vma relocation,
 340                               bfd_byte *location)
 341 {
 342   int r_ns32k_type = (howto - MY (howto_table)) / 6;
 343   bfd_vma (*get_data) (bfd_byte *, int);
 344   void (*put_data) (bfd_vma, bfd_byte *, int);
 345
 346   switch (r_ns32k_type)
 347     {
 348     case 0:
 349       get_data = _bfd_ns32k_get_immediate;
 350       put_data = _bfd_ns32k_put_immediate;
 351       break;
 352     case 1:
 353       get_data = _bfd_ns32k_get_displacement;
 354       put_data = _bfd_ns32k_put_displacement;
 355       break;
 356     case 2:
 357       return _bfd_relocate_contents (howto, input_bfd, relocation,
 358                                     location);
 359     default:
 360       return bfd_reloc_notsupported;
 361     }
 362   return _bfd_do_ns32k_reloc_contents (howto, input_bfd, relocation,
 363                                        location, get_data, put_data);
 364 }