bfd/coff-aarch64.c

   1 /* BFD back-end for AArch64 COFF files.
   2    Copyright (C) 2021-2022 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
  22 #ifndef COFF_WITH_peAArch64
  23 #define COFF_WITH_peAArch64
  24 #endif
  25
  26 /* Note we have to make sure not to include headers twice.
  27    Not all headers are wrapped in #ifdef guards, so we define
  28    PEI_HEADERS to prevent double including here.  */
  29 #ifndef PEI_HEADERS
  30 #include "sysdep.h"
  31 #include "bfd.h"
  32 #include "libbfd.h"
  33 #include "coff/aarch64.h"
  34 #include "coff/internal.h"
  35 #include "coff/pe.h"
  36 #include "libcoff.h"
  37 #include "libiberty.h"
  38 #endif
  39
  40 #include "libcoff.h"
  41
  42 /* In case we're on a 32-bit machine, construct a 64-bit "-1" value.  */
  43 #define MINUS_ONE (~ (bfd_vma) 0)
  44
  45 static const reloc_howto_type arm64_reloc_howto_64 = HOWTO(IMAGE_REL_ARM64_ADDR64, 0, 8, 64, false, 0,
  46          complain_overflow_bitfield,
  47          NULL, "64",
  48          false, MINUS_ONE, MINUS_ONE, false);
  49
  50 static const reloc_howto_type arm64_reloc_howto_32 = HOWTO (IMAGE_REL_ARM64_ADDR32, 0, 4, 32, false, 0,
  51          complain_overflow_bitfield,
  52          NULL, "32",
  53          false, 0xffffffff, 0xffffffff, false);
  54
  55 static const reloc_howto_type arm64_reloc_howto_32_pcrel = HOWTO (IMAGE_REL_ARM64_REL32, 0, 4, 32, true, 0,
  56          complain_overflow_bitfield,
  57          NULL, "DISP32",
  58          false, 0xffffffff, 0xffffffff, true);
  59
  60 static const reloc_howto_type arm64_reloc_howto_branch26 = HOWTO (IMAGE_REL_ARM64_BRANCH26, 0, 4, 26, true, 0,
  61          complain_overflow_bitfield,
  62          NULL, "BRANCH26",
  63          false, 0x03ffffff, 0x03ffffff, true);
  64
  65 static const reloc_howto_type arm64_reloc_howto_page21 = HOWTO (IMAGE_REL_ARM64_PAGEBASE_REL21, 12, 4, 21, true, 0,
  66          complain_overflow_signed,
  67          NULL, "PAGE21",
  68          false, 0x1fffff, 0x1fffff, false);
  69
  70 static const reloc_howto_type arm64_reloc_howto_lo21 = HOWTO (IMAGE_REL_ARM64_REL21, 0, 4, 21, true, 0,
  71          complain_overflow_signed,
  72          NULL, "LO21",
  73          false, 0x1fffff, 0x1fffff, true);
  74
  75 static const reloc_howto_type arm64_reloc_howto_pgoff12 = HOWTO (IMAGE_REL_ARM64_PAGEOFFSET_12L, 1, 4, 12, true, 0,
  76          complain_overflow_signed,
  77          NULL, "PGOFF12",
  78          false, 0xffe, 0xffe, true);
  79
  80 static const reloc_howto_type arm64_reloc_howto_branch19 = HOWTO (IMAGE_REL_ARM64_BRANCH19, 2, 4, 19, true, 0,
  81          complain_overflow_signed,
  82          NULL, "BRANCH19",
  83          false, 0x7ffff, 0x7ffff, true);
  84
  85
  86 static const reloc_howto_type* const arm64_howto_table[] = {
  87      &arm64_reloc_howto_64,
  88      &arm64_reloc_howto_32,
  89      &arm64_reloc_howto_32_pcrel,
  90      &arm64_reloc_howto_branch26,
  91      &arm64_reloc_howto_page21,
  92      &arm64_reloc_howto_lo21,
  93      &arm64_reloc_howto_pgoff12,
  94      &arm64_reloc_howto_branch19
  95 };
  96
  97 #ifndef NUM_ELEM
  98 #define NUM_ELEM(a) ((sizeof (a)) / sizeof ((a)[0]))
  99 #endif
 100
 101 #define NUM_RELOCS NUM_ELEM (arm64_howto_table)
 102
 103 #define coff_bfd_reloc_type_lookup              coff_aarch64_reloc_type_lookup
 104 #define coff_bfd_reloc_name_lookup              coff_aarch64_reloc_name_lookup
 105
 106 static reloc_howto_type *
 107 coff_aarch64_reloc_type_lookup (bfd * abfd ATTRIBUTE_UNUSED, bfd_reloc_code_real_type code)
 108 {
 109   switch (code)
 110   {
 111   case BFD_RELOC_64:
 112     return &arm64_reloc_howto_64;
 113   case BFD_RELOC_32:
 114     return &arm64_reloc_howto_32;
 115   case BFD_RELOC_32_PCREL:
 116     return &arm64_reloc_howto_32_pcrel;
 117   case BFD_RELOC_AARCH64_CALL26:
 118   case BFD_RELOC_AARCH64_JUMP26:
 119     return &arm64_reloc_howto_branch26;
 120   case BFD_RELOC_AARCH64_ADR_HI21_PCREL:
 121     return &arm64_reloc_howto_page21;
 122   case BFD_RELOC_AARCH64_ADR_LO21_PCREL:
 123     return &arm64_reloc_howto_lo21;
 124   case BFD_RELOC_AARCH64_LDST16_LO12:
 125     return &arm64_reloc_howto_pgoff12;
 126   case BFD_RELOC_AARCH64_BRANCH19:
 127     return &arm64_reloc_howto_branch19;
 128   default:
 129     BFD_FAIL ();
 130     return NULL;
 131   }
 132
 133   return NULL;
 134 }
 135
 136 static reloc_howto_type *
 137 coff_aarch64_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
 138                             const char *r_name)
 139 {
 140         unsigned int i;
 141
 142         for (i = 0; i < NUM_RELOCS; i++)
 143           if (arm64_howto_table[i]->name != NULL
 144             && strcasecmp (arm64_howto_table[i]->name, r_name) == 0)
 145             return arm64_howto_table[i];
 146
 147   return NULL;
 148 }
 149
 150 #define COFF_DEFAULT_SECTION_ALIGNMENT_POWER  2
 151 #define COFF_PAGE_SIZE                        0x1000
 152
 153 static reloc_howto_type *
 154 coff_aarch64_rtype_lookup (unsigned int code)
 155 {
 156   switch (code)
 157   {
 158     case IMAGE_REL_ARM64_ADDR64:
 159       return &arm64_reloc_howto_64;
 160     case IMAGE_REL_ARM64_ADDR32:
 161       return &arm64_reloc_howto_32;
 162     case IMAGE_REL_ARM64_REL32:
 163       return &arm64_reloc_howto_32_pcrel;
 164     case IMAGE_REL_ARM64_BRANCH26:
 165       return &arm64_reloc_howto_branch26;
 166     case IMAGE_REL_ARM64_PAGEBASE_REL21:
 167       return &arm64_reloc_howto_page21;
 168     case IMAGE_REL_ARM64_REL21:
 169       return &arm64_reloc_howto_lo21;
 170     case IMAGE_REL_ARM64_PAGEOFFSET_12L:
 171       return &arm64_reloc_howto_pgoff12;
 172     case IMAGE_REL_ARM64_BRANCH19:
 173       return &arm64_reloc_howto_branch19;
 174     default:
 175       BFD_FAIL ();
 176       return NULL;
 177   }
 178
 179   return NULL;
 180 }
 181
 182 #define RTYPE2HOWTO(cache_ptr, dst)                             \
 183   ((cache_ptr)->howto = coff_aarch64_rtype_lookup((dst)->r_type))
 184
 185 #define SELECT_RELOC(x,howto) { (x).r_type = (howto)->type; }
 186
 187 #ifndef bfd_pe_print_pdata
 188 #define bfd_pe_print_pdata      NULL
 189 #endif
 190
 191 /* Handle include/coff/aarch64.h external_reloc.  */
 192 #define SWAP_IN_RELOC_OFFSET    H_GET_32
 193 #define SWAP_OUT_RELOC_OFFSET   H_PUT_32
 194
 195 /* Return TRUE if this relocation should
 196    appear in the output .reloc section.  */
 197
 198 static bool
 199 in_reloc_p (bfd * abfd ATTRIBUTE_UNUSED,
 200             reloc_howto_type * howto)
 201 {
 202   return !howto->pc_relative;
 203 }
 204
 205 #include "coffcode.h"
 206
 207 /* Target vectors.  */
 208 const bfd_target
 209 #ifdef TARGET_SYM
 210   TARGET_SYM =
 211 #else
 212 # error "target symbol name not specified"
 213 #endif
 214 {
 215 #ifdef TARGET_NAME
 216   TARGET_NAME,
 217 #else
 218 # error "target name not specified"
 219 #endif
 220   bfd_target_coff_flavour,
 221   BFD_ENDIAN_LITTLE,            /* Data byte order is little.  */
 222   BFD_ENDIAN_LITTLE,            /* Header byte order is little.  */
 223
 224   (HAS_RELOC | EXEC_P           /* Object flags.  */
 225    | HAS_LINENO | HAS_DEBUG
 226    | HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED | BFD_COMPRESS | BFD_DECOMPRESS),
 227
 228   (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC /* Section flags.  */
 229 #if defined(COFF_WITH_PE)
 230    | SEC_LINK_ONCE | SEC_LINK_DUPLICATES | SEC_READONLY | SEC_DEBUGGING
 231 #endif
 232    | SEC_CODE | SEC_DATA | SEC_EXCLUDE ),
 233
 234 #ifdef TARGET_UNDERSCORE
 235   TARGET_UNDERSCORE,            /* Leading underscore.  */
 236 #else
 237   0,                            /* Leading underscore.  */
 238 #endif
 239   '/',                          /* Ar_pad_char.  */
 240   15,                           /* Ar_max_namelen.  */
 241   0,                            /* match priority.  */
 242   TARGET_KEEP_UNUSED_SECTION_SYMBOLS, /* keep unused section symbols.  */
 243
 244   /* Data conversion functions.  */
 245   bfd_getl64, bfd_getl_signed_64, bfd_putl64,
 246   bfd_getl32, bfd_getl_signed_32, bfd_putl32,
 247   bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* Data.  */
 248   /* Header conversion functions.  */
 249   bfd_getl64, bfd_getl_signed_64, bfd_putl64,
 250   bfd_getl32, bfd_getl_signed_32, bfd_putl32,
 251   bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* Hdrs.  */
 252
 253   /* Note that we allow an object file to be treated as a core file as well.  */
 254   {                             /* bfd_check_format.  */
 255     _bfd_dummy_target,
 256     coff_object_p,
 257     bfd_generic_archive_p,
 258     coff_object_p
 259   },
 260   {                             /* bfd_set_format.  */
 261     _bfd_bool_bfd_false_error,
 262     coff_mkobject,
 263     _bfd_generic_mkarchive,
 264     _bfd_bool_bfd_false_error
 265   },
 266   {                             /* bfd_write_contents.  */
 267     _bfd_bool_bfd_false_error,
 268     coff_write_object_contents,
 269     _bfd_write_archive_contents,
 270     _bfd_bool_bfd_false_error
 271   },
 272
 273   BFD_JUMP_TABLE_GENERIC (coff),
 274   BFD_JUMP_TABLE_COPY (coff),
 275   BFD_JUMP_TABLE_CORE (_bfd_nocore),
 276   BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_coff),
 277   BFD_JUMP_TABLE_SYMBOLS (coff),
 278   BFD_JUMP_TABLE_RELOCS (coff),
 279   BFD_JUMP_TABLE_WRITE (coff),
 280   BFD_JUMP_TABLE_LINK (coff),
 281   BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
 282
 283   NULL,
 284
 285   COFF_SWAP_TABLE
 286 };