bfd/elf32-sh64-com.c

   1 /* SuperH SH64-specific support for 32-bit ELF
   2    Copyright (C) 2000-2016 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 #define SH64_ELF
  22
  23 #include "sysdep.h"
  24 #include "bfd.h"
  25 #include "libbfd.h"
  26 #include "elf-bfd.h"
  27 #include "elf/sh.h"
  28 #include "elf32-sh64.h"
  29 #include "../opcodes/sh64-opc.h"
  30
  31 static bfd_boolean sh64_address_in_cranges
  32   (asection *cranges, bfd_vma, sh64_elf_crange *);
  33
  34 /* Ordering functions of a crange, for the qsort and bsearch calls and for
  35    different endianness.  */
  36
  37 int
  38 _bfd_sh64_crange_qsort_cmpb (const void *p1, const void *p2)
  39 {
  40   bfd_vma a1 = bfd_getb32 (p1);
  41   bfd_vma a2 = bfd_getb32 (p2);
  42
  43   /* Preserve order if there's ambiguous contents.  */
  44   if (a1 == a2)
  45     return (char *) p1 - (char *) p2;
  46
  47   return a1 - a2;
  48 }
  49
  50 int
  51 _bfd_sh64_crange_qsort_cmpl (const void *p1, const void *p2)
  52 {
  53   bfd_vma a1 = (bfd_vma) bfd_getl32 (p1);
  54   bfd_vma a2 = (bfd_vma) bfd_getl32 (p2);
  55
  56   /* Preserve order if there's ambiguous contents.  */
  57   if (a1 == a2)
  58     return (char *) p1 - (char *) p2;
  59
  60   return a1 - a2;
  61 }
  62
  63 int
  64 _bfd_sh64_crange_bsearch_cmpb (const void *p1, const void *p2)
  65 {
  66   bfd_vma a1 = *(bfd_vma *) p1;
  67   bfd_vma a2 = (bfd_vma) bfd_getb32 (p2);
  68   bfd_size_type size
  69     = (bfd_size_type) bfd_getb32 (SH64_CRANGE_CR_SIZE_OFFSET + (char *) p2);
  70
  71   if (a1 >= a2 + size)
  72     return 1;
  73   if (a1 < a2)
  74     return -1;
  75   return 0;
  76 }
  77
  78 int
  79 _bfd_sh64_crange_bsearch_cmpl (const void *p1, const void *p2)
  80 {
  81   bfd_vma a1 = *(bfd_vma *) p1;
  82   bfd_vma a2 = (bfd_vma) bfd_getl32 (p2);
  83   bfd_size_type size
  84     = (bfd_size_type) bfd_getl32 (SH64_CRANGE_CR_SIZE_OFFSET + (char *) p2);
  85
  86   if (a1 >= a2 + size)
  87     return 1;
  88   if (a1 < a2)
  89     return -1;
  90   return 0;
  91 }
  92
  93 /* Check whether a specific address is specified within a .cranges
  94    section.  Return FALSE if not found, and TRUE if found, and the region
  95    filled into RANGEP if non-NULL.  */
  96
  97 static bfd_boolean
  98 sh64_address_in_cranges (asection *cranges, bfd_vma addr,
  99                          sh64_elf_crange *rangep)
 100 {
 101   bfd_byte *cranges_contents;
 102   bfd_byte *found_rangep;
 103   bfd_size_type cranges_size = cranges->size;
 104
 105   /* If the size is not a multiple of the cranges entry size, then
 106      something is badly wrong.  */
 107   if ((cranges_size % SH64_CRANGE_SIZE) != 0)
 108     return FALSE;
 109
 110   /* If this section has relocations, then we can't do anything sane.  */
 111   if (bfd_get_section_flags (cranges->owner, cranges) & SEC_RELOC)
 112     return FALSE;
 113
 114   /* Has some kind soul (or previous call) left processed, sorted contents
 115      for us?  */
 116   if ((bfd_get_section_flags (cranges->owner, cranges) & SEC_IN_MEMORY)
 117       && elf_section_data (cranges)->this_hdr.sh_type == SHT_SH5_CR_SORTED)
 118     cranges_contents = cranges->contents;
 119   else
 120     {
 121       if (!bfd_malloc_and_get_section (cranges->owner, cranges,
 122                                        &cranges_contents))
 123         goto error_return;
 124
 125       /* Is it sorted?  */
 126       if (elf_section_data (cranges)->this_hdr.sh_type
 127           != SHT_SH5_CR_SORTED)
 128         /* Nope.  Lets sort it.  */
 129         qsort (cranges_contents, cranges_size / SH64_CRANGE_SIZE,
 130                SH64_CRANGE_SIZE,
 131                bfd_big_endian (cranges->owner)
 132                ? _bfd_sh64_crange_qsort_cmpb : _bfd_sh64_crange_qsort_cmpl);
 133
 134       /* Let's keep it around.  */
 135       cranges->contents = cranges_contents;
 136       bfd_set_section_flags (cranges->owner, cranges,
 137                              bfd_get_section_flags (cranges->owner, cranges)
 138                              | SEC_IN_MEMORY);
 139
 140       /* It's sorted now.  */
 141       elf_section_data (cranges)->this_hdr.sh_type = SHT_SH5_CR_SORTED;
 142     }
 143
 144   /* Try and find a matching range.  */
 145   found_rangep
 146     = bsearch (&addr, cranges_contents, cranges_size / SH64_CRANGE_SIZE,
 147                SH64_CRANGE_SIZE,
 148                bfd_big_endian (cranges->owner)
 149                ? _bfd_sh64_crange_bsearch_cmpb
 150                : _bfd_sh64_crange_bsearch_cmpl);
 151
 152   /* Fill in a few return values if we found a matching range.  */
 153   if (found_rangep)
 154     {
 155       enum sh64_elf_cr_type cr_type
 156         = bfd_get_16 (cranges->owner,
 157                       SH64_CRANGE_CR_TYPE_OFFSET + found_rangep);
 158       bfd_vma cr_addr
 159         = bfd_get_32 (cranges->owner,
 160                       SH64_CRANGE_CR_ADDR_OFFSET
 161                       + (char *) found_rangep);
 162       bfd_size_type cr_size
 163         = bfd_get_32 (cranges->owner,
 164                       SH64_CRANGE_CR_SIZE_OFFSET
 165                       + (char *) found_rangep);
 166
 167       rangep->cr_addr = cr_addr;
 168       rangep->cr_size = cr_size;
 169       rangep->cr_type = cr_type;
 170
 171       return TRUE;
 172     }
 173
 174   /* There is a .cranges section, but it does not have a descriptor
 175      matching this address.  */
 176   return FALSE;
 177
 178 error_return:
 179   if (cranges_contents != NULL)
 180     free (cranges_contents);
 181   return FALSE;
 182 }
 183
 184 /* Determine what ADDR points to in SEC, and fill in a range descriptor in
 185    *RANGEP if it's non-NULL.  */
 186
 187 enum sh64_elf_cr_type
 188 sh64_get_contents_type (asection *sec, bfd_vma addr, sh64_elf_crange *rangep)
 189 {
 190   asection *cranges;
 191
 192   /* Fill in the range with the boundaries of the section as a default.  */
 193   if (bfd_get_flavour (sec->owner) == bfd_target_elf_flavour
 194       && elf_elfheader (sec->owner)->e_type == ET_EXEC)
 195     {
 196       rangep->cr_addr = bfd_get_section_vma (sec->owner, sec);
 197       rangep->cr_size = sec->size;
 198       rangep->cr_type = CRT_NONE;
 199     }
 200   else
 201     return FALSE;
 202
 203   /* If none of the pertinent bits are set, then it's a SHcompact (or at
 204      least not SHmedia).  */
 205   if ((elf_section_data (sec)->this_hdr.sh_flags
 206        & (SHF_SH5_ISA32 | SHF_SH5_ISA32_MIXED)) == 0)
 207     {
 208       enum sh64_elf_cr_type cr_type
 209         = ((bfd_get_section_flags (sec->owner, sec) & SEC_CODE) != 0
 210            ? CRT_SH5_ISA16 : CRT_DATA);
 211       rangep->cr_type = cr_type;
 212       return cr_type;
 213     }
 214
 215   /* If only the SHF_SH5_ISA32 bit is set, then we have SHmedia.  */
 216   if ((elf_section_data (sec)->this_hdr.sh_flags
 217        & (SHF_SH5_ISA32 | SHF_SH5_ISA32_MIXED)) == SHF_SH5_ISA32)
 218     {
 219       rangep->cr_type = CRT_SH5_ISA32;
 220       return CRT_SH5_ISA32;
 221     }
 222
 223   /* Otherwise, we have to look up the .cranges section.  */
 224   cranges = bfd_get_section_by_name (sec->owner, SH64_CRANGES_SECTION_NAME);
 225
 226   if (cranges == NULL)
 227     /* A mixed section but there's no .cranges section.  This is probably
 228        bad input; it does not comply to specs.  */
 229     return CRT_NONE;
 230
 231   /* If this call fails, we will still have CRT_NONE in rangep->cr_type
 232      and that will be suitable to return.  */
 233   sh64_address_in_cranges (cranges, addr, rangep);
 234
 235   return rangep->cr_type;
 236 }
 237
 238 /* This is a simpler exported interface for the benefit of gdb et al.  */
 239
 240 bfd_boolean
 241 sh64_address_is_shmedia (asection *sec, bfd_vma addr)
 242 {
 243   sh64_elf_crange dummy;
 244   return sh64_get_contents_type (sec, addr, &dummy) == CRT_SH5_ISA32;
 245 }