bfd/elf32-sh64-com.c

   1 /* SuperH SH64-specific support for 32-bit ELF
   2    Copyright 2000, 2001, 2002, 2003, 2004, 2007
   3    Free Software Foundation, Inc.
   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 #define SH64_ELF
  23
  24 #include "sysdep.h"
  25 #include "bfd.h"
  26 #include "libbfd.h"
  27 #include "elf-bfd.h"
  28 #include "elf/sh.h"
  29 #include "elf32-sh64.h"
  30 #include "../opcodes/sh64-opc.h"
  31
  32 static bfd_boolean sh64_address_in_cranges
  33   (asection *cranges, bfd_vma, sh64_elf_crange *);
  34
  35 /* Ordering functions of a crange, for the qsort and bsearch calls and for
  36    different endianness.  */
  37
  38 int
  39 _bfd_sh64_crange_qsort_cmpb (const void *p1, const void *p2)
  40 {
  41   bfd_vma a1 = bfd_getb32 (p1);
  42   bfd_vma a2 = bfd_getb32 (p2);
  43
  44   /* Preserve order if there's ambiguous contents.  */
  45   if (a1 == a2)
  46     return (char *) p1 - (char *) p2;
  47
  48   return a1 - a2;
  49 }
  50
  51 int
  52 _bfd_sh64_crange_qsort_cmpl (const void *p1, const void *p2)
  53 {
  54   bfd_vma a1 = (bfd_vma) bfd_getl32 (p1);
  55   bfd_vma a2 = (bfd_vma) bfd_getl32 (p2);
  56
  57   /* Preserve order if there's ambiguous contents.  */
  58   if (a1 == a2)
  59     return (char *) p1 - (char *) p2;
  60
  61   return a1 - a2;
  62 }
  63
  64 int
  65 _bfd_sh64_crange_bsearch_cmpb (const void *p1, const void *p2)
  66 {
  67   bfd_vma a1 = *(bfd_vma *) p1;
  68   bfd_vma a2 = (bfd_vma) bfd_getb32 (p2);
  69   bfd_size_type size
  70     = (bfd_size_type) bfd_getb32 (SH64_CRANGE_CR_SIZE_OFFSET + (char *) p2);
  71
  72   if (a1 >= a2 + size)
  73     return 1;
  74   if (a1 < a2)
  75     return -1;
  76   return 0;
  77 }
  78
  79 int
  80 _bfd_sh64_crange_bsearch_cmpl (const void *p1, const void *p2)
  81 {
  82   bfd_vma a1 = *(bfd_vma *) p1;
  83   bfd_vma a2 = (bfd_vma) bfd_getl32 (p2);
  84   bfd_size_type size
  85     = (bfd_size_type) bfd_getl32 (SH64_CRANGE_CR_SIZE_OFFSET + (char *) p2);
  86
  87   if (a1 >= a2 + size)
  88     return 1;
  89   if (a1 < a2)
  90     return -1;
  91   return 0;
  92 }
  93
  94 /* Check whether a specific address is specified within a .cranges
  95    section.  Return FALSE if not found, and TRUE if found, and the region
  96    filled into RANGEP if non-NULL.  */
  97
  98 static bfd_boolean
  99 sh64_address_in_cranges (asection *cranges, bfd_vma addr,
 100                          sh64_elf_crange *rangep)
 101 {
 102   bfd_byte *cranges_contents;
 103   bfd_byte *found_rangep;
 104   bfd_size_type cranges_size = cranges->size;
 105
 106   /* If the size is not a multiple of the cranges entry size, then
 107      something is badly wrong.  */
 108   if ((cranges_size % SH64_CRANGE_SIZE) != 0)
 109     return FALSE;
 110
 111   /* If this section has relocations, then we can't do anything sane.  */
 112   if (bfd_get_section_flags (cranges->owner, cranges) & SEC_RELOC)
 113     return FALSE;
 114
 115   /* Has some kind soul (or previous call) left processed, sorted contents
 116      for us?  */
 117   if ((bfd_get_section_flags (cranges->owner, cranges) & SEC_IN_MEMORY)
 118       && elf_section_data (cranges)->this_hdr.sh_type == SHT_SH5_CR_SORTED)
 119     cranges_contents = cranges->contents;
 120   else
 121     {
 122       if (!bfd_malloc_and_get_section (cranges->owner, cranges,
 123                                        &cranges_contents))
 124         goto error_return;
 125
 126       /* Is it sorted?  */
 127       if (elf_section_data (cranges)->this_hdr.sh_type
 128           != SHT_SH5_CR_SORTED)
 129         /* Nope.  Lets sort it.  */
 130         qsort (cranges_contents, cranges_size / SH64_CRANGE_SIZE,
 131                SH64_CRANGE_SIZE,
 132                bfd_big_endian (cranges->owner)
 133                ? _bfd_sh64_crange_qsort_cmpb : _bfd_sh64_crange_qsort_cmpl);
 134
 135       /* Let's keep it around.  */
 136       cranges->contents = cranges_contents;
 137       bfd_set_section_flags (cranges->owner, cranges,
 138                              bfd_get_section_flags (cranges->owner, cranges)
 139                              | SEC_IN_MEMORY);
 140
 141       /* It's sorted now.  */
 142       elf_section_data (cranges)->this_hdr.sh_type = SHT_SH5_CR_SORTED;
 143     }
 144
 145   /* Try and find a matching range.  */
 146   found_rangep
 147     = bsearch (&addr, cranges_contents, cranges_size / SH64_CRANGE_SIZE,
 148                SH64_CRANGE_SIZE,
 149                bfd_big_endian (cranges->owner)
 150                ? _bfd_sh64_crange_bsearch_cmpb
 151                : _bfd_sh64_crange_bsearch_cmpl);
 152
 153   /* Fill in a few return values if we found a matching range.  */
 154   if (found_rangep)
 155     {
 156       enum sh64_elf_cr_type cr_type
 157         = bfd_get_16 (cranges->owner,
 158                       SH64_CRANGE_CR_TYPE_OFFSET + found_rangep);
 159       bfd_vma cr_addr
 160         = bfd_get_32 (cranges->owner,
 161                       SH64_CRANGE_CR_ADDR_OFFSET
 162                       + (char *) found_rangep);
 163       bfd_size_type cr_size
 164         = bfd_get_32 (cranges->owner,
 165                       SH64_CRANGE_CR_SIZE_OFFSET
 166                       + (char *) found_rangep);
 167
 168       rangep->cr_addr = cr_addr;
 169       rangep->cr_size = cr_size;
 170       rangep->cr_type = cr_type;
 171
 172       return TRUE;
 173     }
 174
 175   /* There is a .cranges section, but it does not have a descriptor
 176      matching this address.  */
 177   return FALSE;
 178
 179 error_return:
 180   if (cranges_contents != NULL)
 181     free (cranges_contents);
 182   return FALSE;
 183 }
 184
 185 /* Determine what ADDR points to in SEC, and fill in a range descriptor in
 186    *RANGEP if it's non-NULL.  */
 187
 188 enum sh64_elf_cr_type
 189 sh64_get_contents_type (asection *sec, bfd_vma addr, sh64_elf_crange *rangep)
 190 {
 191   asection *cranges;
 192
 193   /* Fill in the range with the boundaries of the section as a default.  */
 194   if (bfd_get_flavour (sec->owner) == bfd_target_elf_flavour
 195       && elf_elfheader (sec->owner)->e_type == ET_EXEC)
 196     {
 197       rangep->cr_addr = bfd_get_section_vma (sec->owner, sec);
 198       rangep->cr_size = sec->size;
 199       rangep->cr_type = CRT_NONE;
 200     }
 201   else
 202     return FALSE;
 203
 204   /* If none of the pertinent bits are set, then it's a SHcompact (or at
 205      least not SHmedia).  */
 206   if ((elf_section_data (sec)->this_hdr.sh_flags
 207        & (SHF_SH5_ISA32 | SHF_SH5_ISA32_MIXED)) == 0)
 208     {
 209       enum sh64_elf_cr_type cr_type
 210         = ((bfd_get_section_flags (sec->owner, sec) & SEC_CODE) != 0
 211            ? CRT_SH5_ISA16 : CRT_DATA);
 212       rangep->cr_type = cr_type;
 213       return cr_type;
 214     }
 215
 216   /* If only the SHF_SH5_ISA32 bit is set, then we have SHmedia.  */
 217   if ((elf_section_data (sec)->this_hdr.sh_flags
 218        & (SHF_SH5_ISA32 | SHF_SH5_ISA32_MIXED)) == SHF_SH5_ISA32)
 219     {
 220       rangep->cr_type = CRT_SH5_ISA32;
 221       return CRT_SH5_ISA32;
 222     }
 223
 224   /* Otherwise, we have to look up the .cranges section.  */
 225   cranges = bfd_get_section_by_name (sec->owner, SH64_CRANGES_SECTION_NAME);
 226
 227   if (cranges == NULL)
 228     /* A mixed section but there's no .cranges section.  This is probably
 229        bad input; it does not comply to specs.  */
 230     return CRT_NONE;
 231
 232   /* If this call fails, we will still have CRT_NONE in rangep->cr_type
 233      and that will be suitable to return.  */
 234   sh64_address_in_cranges (cranges, addr, rangep);
 235
 236   return rangep->cr_type;
 237 }
 238
 239 /* This is a simpler exported interface for the benefit of gdb et al.  */
 240
 241 bfd_boolean
 242 sh64_address_is_shmedia (asection *sec, bfd_vma addr)
 243 {
 244   sh64_elf_crange dummy;
 245   return sh64_get_contents_type (sec, addr, &dummy) == CRT_SH5_ISA32;
 246 }