bfd/mach-o-arm.c

   1 /* ARM Mach-O support for BFD.
   2    Copyright (C) 2015-2022 Free Software Foundation, Inc.
   3
   4    This file is part of BFD, the Binary File Descriptor library.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  19    MA 02110-1301, USA.  */
  20
  21 #include "sysdep.h"
  22 #include "bfd.h"
  23 #include "libbfd.h"
  24 #include "libiberty.h"
  25 #include "mach-o.h"
  26 #include "mach-o/arm.h"
  27
  28 #define bfd_mach_o_object_p bfd_mach_o_arm_object_p
  29 #define bfd_mach_o_core_p bfd_mach_o_arm_core_p
  30 #define bfd_mach_o_mkobject bfd_mach_o_arm_mkobject
  31
  32 #define bfd_mach_o_canonicalize_one_reloc bfd_mach_o_arm_canonicalize_one_reloc
  33 #define bfd_mach_o_swap_reloc_out  NULL
  34 #define bfd_mach_o_bfd_reloc_type_lookup bfd_mach_o_arm_bfd_reloc_type_lookup
  35 #define bfd_mach_o_bfd_reloc_name_lookup bfd_mach_o_arm_bfd_reloc_name_lookup
  36
  37 #define bfd_mach_o_print_thread NULL
  38 #define bfd_mach_o_tgt_seg_table NULL
  39 #define bfd_mach_o_section_type_valid_for_tgt NULL
  40
  41 static bfd_cleanup
  42 bfd_mach_o_arm_object_p (bfd *abfd)
  43 {
  44   return bfd_mach_o_header_p (abfd, 0, 0, BFD_MACH_O_CPU_TYPE_ARM);
  45 }
  46
  47 static bfd_cleanup
  48 bfd_mach_o_arm_core_p (bfd *abfd)
  49 {
  50   return bfd_mach_o_header_p (abfd, 0,
  51                               BFD_MACH_O_MH_CORE, BFD_MACH_O_CPU_TYPE_ARM);
  52 }
  53
  54 static bool
  55 bfd_mach_o_arm_mkobject (bfd *abfd)
  56 {
  57   bfd_mach_o_data_struct *mdata;
  58
  59   if (!bfd_mach_o_mkobject_init (abfd))
  60     return false;
  61
  62   mdata = bfd_mach_o_get_data (abfd);
  63   mdata->header.magic = BFD_MACH_O_MH_MAGIC;
  64   mdata->header.cputype = BFD_MACH_O_CPU_TYPE_ARM;
  65   mdata->header.cpusubtype = BFD_MACH_O_CPU_SUBTYPE_ARM_ALL;
  66   mdata->header.byteorder = BFD_ENDIAN_LITTLE;
  67   mdata->header.version = 1;
  68
  69   return true;
  70 }
  71
  72 static reloc_howto_type arm_howto_table[]=
  73 {
  74   /* 0 */
  75   HOWTO (BFD_RELOC_32, 0, 2, 32, false, 0,
  76          complain_overflow_bitfield,
  77          NULL, "32",
  78          false, 0xffffffff, 0xffffffff, false),
  79   HOWTO (BFD_RELOC_16, 0, 1, 16, false, 0,
  80          complain_overflow_bitfield,
  81          NULL, "16",
  82          false, 0xffff, 0xffff, false),
  83   HOWTO (BFD_RELOC_8, 0, 0, 8, false, 0,
  84          complain_overflow_bitfield,
  85          NULL, "8",
  86          false, 0xff, 0xff, false),
  87   HOWTO (BFD_RELOC_32_PCREL, 0, 2, 32, true, 0,
  88          complain_overflow_bitfield,
  89          NULL, "DISP32",
  90          false, 0xffffffff, 0xffffffff, true),
  91   /* 4 */
  92   HOWTO (BFD_RELOC_16_PCREL, 0, 1, 16, true, 0,
  93          complain_overflow_bitfield,
  94          NULL, "DISP16",
  95          false, 0xffff, 0xffff, true),
  96   HOWTO (BFD_RELOC_MACH_O_SECTDIFF, 0, 2, 32, false, 0,
  97          complain_overflow_bitfield,
  98          NULL, "SECTDIFF_32",
  99          false, 0xffffffff, 0xffffffff, false),
 100   HOWTO (BFD_RELOC_MACH_O_LOCAL_SECTDIFF, 0, 2, 32, false, 0,
 101          complain_overflow_bitfield,
 102          NULL, "LSECTDIFF_32",
 103          false, 0xffffffff, 0xffffffff, false),
 104   HOWTO (BFD_RELOC_MACH_O_PAIR, 0, 2, 32, false, 0,
 105          complain_overflow_bitfield,
 106          NULL, "PAIR_32",
 107          false, 0xffffffff, 0xffffffff, false),
 108   /* 8 */
 109   HOWTO (BFD_RELOC_MACH_O_SECTDIFF, 0, 1, 16, false, 0,
 110          complain_overflow_bitfield,
 111          NULL, "SECTDIFF_16",
 112          false, 0xffff, 0xffff, false),
 113   HOWTO (BFD_RELOC_MACH_O_LOCAL_SECTDIFF, 0, 1, 16, false, 0,
 114          complain_overflow_bitfield,
 115          NULL, "LSECTDIFF_16",
 116          false, 0xffff, 0xffff, false),
 117   HOWTO (BFD_RELOC_MACH_O_PAIR, 0, 1, 16, false, 0,
 118          complain_overflow_bitfield,
 119          NULL, "PAIR_16",
 120          false, 0xffff, 0xffff, false),
 121   HOWTO (BFD_RELOC_ARM_PCREL_CALL, 2, 2, 24, true, 0,
 122          complain_overflow_signed,
 123          NULL, "BR24",
 124          false, 0x00ffffff, 0x00ffffff, true),
 125   /* 12 */
 126   HOWTO (BFD_RELOC_ARM_MOVW, 0, 2, 16, false, 0,
 127          complain_overflow_dont,
 128          NULL, "MOVW",
 129          false, 0x000f0fff, 0x000f0fff, false),
 130   HOWTO (BFD_RELOC_MACH_O_PAIR, 0, 2, 16, false, 0,
 131          complain_overflow_bitfield,
 132          NULL, "PAIR_W",
 133          false, 0x000f0fff, 0x000f0fff, false),
 134   HOWTO (BFD_RELOC_ARM_MOVT, 0, 2, 16, false, 0,
 135          complain_overflow_bitfield,
 136          NULL, "MOVT",
 137          false, 0x000f0fff, 0x000f0fff, false),
 138   HOWTO (BFD_RELOC_MACH_O_PAIR, 0, 2, 16, false, 0,
 139          complain_overflow_bitfield,
 140          NULL, "PAIR_T",
 141          false, 0x000f0fff, 0x000f0fff, false),
 142   /* 16 */
 143   HOWTO (BFD_RELOC_THUMB_PCREL_BLX, 2, 2, 24, true, 0,
 144          complain_overflow_signed,
 145          NULL, "TBR22",
 146          false, 0x07ff2fff, 0x07ff2fff, true)
 147 };
 148
 149 static bool
 150 bfd_mach_o_arm_canonicalize_one_reloc (bfd *       abfd,
 151                                        struct mach_o_reloc_info_external * raw,
 152                                        arelent *   res,
 153                                        asymbol **  syms,
 154                                        arelent *   res_base)
 155 {
 156   bfd_mach_o_reloc_info reloc;
 157
 158   if (!bfd_mach_o_pre_canonicalize_one_reloc (abfd, raw, &reloc, res, syms))
 159     return false;
 160
 161   if (reloc.r_scattered)
 162     {
 163       switch (reloc.r_type)
 164         {
 165         case BFD_MACH_O_ARM_RELOC_PAIR:
 166           /* PR 21813: Check for a corrupt PAIR reloc at the start.  */
 167           if (res == res_base)
 168             {
 169               _bfd_error_handler (_("malformed mach-o ARM reloc pair: "
 170                                     "reloc is first reloc"));
 171               return false;
 172             }
 173           if (reloc.r_length == 2)
 174             {
 175               res->howto = &arm_howto_table[7];
 176               res->address = res[-1].address;
 177               return true;
 178             }
 179           else if (reloc.r_length == 1)
 180             {
 181               res->howto = &arm_howto_table[10];
 182               res->address = res[-1].address;
 183               return true;
 184             }
 185           _bfd_error_handler (_("malformed mach-o ARM reloc pair: "
 186                                 "invalid length: %d"), reloc.r_length);
 187           return false;
 188
 189         case BFD_MACH_O_ARM_RELOC_SECTDIFF:
 190           if (reloc.r_length == 2)
 191             {
 192               res->howto = &arm_howto_table[5];
 193               return true;
 194             }
 195           else if (reloc.r_length == 1)
 196             {
 197               res->howto = &arm_howto_table[8];
 198               return true;
 199             }
 200           _bfd_error_handler (_("malformed mach-o ARM sectdiff reloc: "
 201                                 "invalid length: %d"), reloc.r_length);
 202           return false;
 203
 204         case BFD_MACH_O_ARM_RELOC_LOCAL_SECTDIFF:
 205           if (reloc.r_length == 2)
 206             {
 207               res->howto = &arm_howto_table[6];
 208               return true;
 209             }
 210           else if (reloc.r_length == 1)
 211             {
 212               res->howto = &arm_howto_table[9];
 213               return true;
 214             }
 215           _bfd_error_handler (_("malformed mach-o ARM local sectdiff reloc: "
 216                                 "invalid length: %d"),
 217                               reloc.r_length);
 218           return false;
 219
 220         case BFD_MACH_O_ARM_RELOC_HALF_SECTDIFF:
 221           switch (reloc.r_length)
 222             {
 223             case 2: /* :lower16: for movw arm.  */
 224               res->howto = &arm_howto_table[12];
 225               return true;
 226             case 3: /* :upper16: for movt arm.  */
 227               res->howto = &arm_howto_table[14];
 228               return true;
 229             }
 230           _bfd_error_handler (_("malformed mach-o ARM half sectdiff reloc: "
 231                                 "invalid length: %d"),
 232                               reloc.r_length);
 233           return false;
 234
 235         default:
 236           break;
 237         }
 238     }
 239   else
 240     {
 241       switch (reloc.r_type)
 242         {
 243         case BFD_MACH_O_ARM_RELOC_VANILLA:
 244           switch ((reloc.r_length << 1) | reloc.r_pcrel)
 245             {
 246             case 0: /* len = 0, pcrel = 0  */
 247               res->howto = &arm_howto_table[2];
 248               return true;
 249             case 2: /* len = 1, pcrel = 0  */
 250               res->howto = &arm_howto_table[1];
 251               return true;
 252             case 3: /* len = 1, pcrel = 1  */
 253               res->howto = &arm_howto_table[4];
 254               return true;
 255             case 4: /* len = 2, pcrel = 0  */
 256               res->howto = &arm_howto_table[0];
 257               return true;
 258             case 5: /* len = 2, pcrel = 1  */
 259               res->howto = &arm_howto_table[3];
 260               return true;
 261             default:
 262               _bfd_error_handler (_("malformed mach-o ARM vanilla reloc: "
 263                                     "invalid length: %d (pcrel: %d)"),
 264                                   reloc.r_length, reloc.r_pcrel);
 265               return false;
 266             }
 267           break;
 268
 269         case BFD_MACH_O_ARM_RELOC_BR24:
 270           if (reloc.r_length == 2 && reloc.r_pcrel == 1)
 271             {
 272               res->howto = &arm_howto_table[11];
 273               return true;
 274             }
 275           break;
 276
 277         case BFD_MACH_O_THUMB_RELOC_BR22:
 278           if (reloc.r_length == 2 && reloc.r_pcrel == 1)
 279             {
 280               res->howto = &arm_howto_table[16];
 281               return true;
 282             }
 283           break;
 284
 285         case BFD_MACH_O_ARM_RELOC_HALF:
 286           if (reloc.r_pcrel == 0)
 287             switch (reloc.r_length)
 288               {
 289               case 0: /* :lower16: for movw arm.  */
 290                 res->howto = &arm_howto_table[12];
 291                 return true;
 292               case 1: /* :upper16: for movt arm.  */
 293                 res->howto = &arm_howto_table[14];
 294                 return true;
 295               }
 296           break;
 297
 298         case BFD_MACH_O_ARM_RELOC_PAIR:
 299           if (res == res_base)
 300             {
 301               _bfd_error_handler (_("malformed mach-o ARM reloc pair: "
 302                                     "reloc is first reloc"));
 303               return false;
 304             }
 305           if (res[-1].howto == &arm_howto_table[12]
 306               && reloc.r_length == 0)
 307             {
 308               /* Pair for :lower16: of movw arm.  */
 309               res->howto = &arm_howto_table[13];
 310               /* This reloc contains the other half in its r_address field.  */
 311               res[-1].addend += (res->address & 0xffff) << 16;
 312               res->address = res[-1].address;
 313               return true;
 314             }
 315           else if (res[-1].howto == &arm_howto_table[14]
 316                    && reloc.r_length == 1)
 317             {
 318               /* Pair for :upper16: of movt arm.  */
 319               res->howto = &arm_howto_table[15];
 320               /* This reloc contains the other half in its r_address field.  */
 321               res[-1].addend += res->address & 0xffff;
 322               res->address = res[-1].address;
 323               return true;
 324             }
 325           break;
 326
 327         default:
 328           break;
 329         }
 330     }
 331
 332   _bfd_error_handler (_("malformed mach-o ARM reloc: "
 333                         "unknown reloc type: %d"), reloc.r_length);
 334   return false;
 335 }
 336
 337 static reloc_howto_type *
 338 bfd_mach_o_arm_bfd_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
 339                                       bfd_reloc_code_real_type code)
 340 {
 341   unsigned int i;
 342
 343   for (i = 0; i < sizeof (arm_howto_table) / sizeof (*arm_howto_table); i++)
 344     if (code == arm_howto_table[i].type)
 345       return &arm_howto_table[i];
 346   return NULL;
 347 }
 348
 349 static reloc_howto_type *
 350 bfd_mach_o_arm_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
 351                                       const char *name ATTRIBUTE_UNUSED)
 352 {
 353   return NULL;
 354 }
 355
 356 #define TARGET_NAME             arm_mach_o_vec
 357 #define TARGET_STRING           "mach-o-arm"
 358 #define TARGET_ARCHITECTURE     bfd_arch_arm
 359 #define TARGET_PAGESIZE         4096
 360 #define TARGET_BIG_ENDIAN       0
 361 #define TARGET_ARCHIVE          0
 362 #define TARGET_PRIORITY         0
 363 #include "mach-o-target.c"