bfd/elf32-sh64-com.c

   1 /* SuperH SH64-specific support for 32-bit ELF
   2    Copyright 2000, 2001, 2002, 2003, 2004 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 2 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, MA 02110-1301, USA.  */
  19
  20 #define SH64_ELF
  21
  22 #include "bfd.h"
  23 #include "sysdep.h"
  24 #include "libbfd.h"
  25 #include "elf-bfd.h"
  26 #include "elf/sh.h"
  27 #include "elf32-sh64.h"
  28 #include "../opcodes/sh64-opc.h"
  29
  30 static bfd_boolean sh64_address_in_cranges
  31   (asection *cranges, bfd_vma, sh64_elf_crange *);
  32
  33 /* Ordering functions of a crange, for the qsort and bsearch calls and for
  34    different endianness.  */
  35
  36 int
  37 _bfd_sh64_crange_qsort_cmpb (const void *p1, const void *p2)
  38 {
  39   bfd_vma a1 = bfd_getb32 (p1);
  40   bfd_vma a2 = bfd_getb32 (p2);
  41
  42   /* Preserve order if there's ambiguous contents.  */
  43   if (a1 == a2)
  44     return (char *) p1 - (char *) p2;
  45
  46   return a1 - a2;
  47 }
  48
  49 int
  50 _bfd_sh64_crange_qsort_cmpl (const void *p1, const void *p2)
  51 {
  52   bfd_vma a1 = (bfd_vma) bfd_getl32 (p1);
  53   bfd_vma a2 = (bfd_vma) bfd_getl32 (p2);
  54
  55   /* Preserve order if there's ambiguous contents.  */
  56   if (a1 == a2)
  57     return (char *) p1 - (char *) p2;
  58
  59   return a1 - a2;
  60 }
  61
  62 int
  63 _bfd_sh64_crange_bsearch_cmpb (const void *p1, const void *p2)
  64 {
  65   bfd_vma a1 = *(bfd_vma *) p1;
  66   bfd_vma a2 = (bfd_vma) bfd_getb32 (p2);
  67   bfd_size_type size
  68     = (bfd_size_type) bfd_getb32 (SH64_CRANGE_CR_SIZE_OFFSET + (char *) p2);
  69
  70   if (a1 >= a2 + size)
  71     return 1;
  72   if (a1 < a2)
  73     return -1;
  74   return 0;
  75 }
  76
  77 int
  78 _bfd_sh64_crange_bsearch_cmpl (const void *p1, const void *p2)
  79 {
  80   bfd_vma a1 = *(bfd_vma *) p1;
  81   bfd_vma a2 = (bfd_vma) bfd_getl32 (p2);
  82   bfd_size_type size
  83     = (bfd_size_type) bfd_getl32 (SH64_CRANGE_CR_SIZE_OFFSET + (char *) p2);
  84
  85   if (a1 >= a2 + size)
  86     return 1;
  87   if (a1 < a2)
  88     return -1;
  89   return 0;
  90 }
  91
  92 /* Check whether a specific address is specified within a .cranges
  93    section.  Return FALSE if not found, and TRUE if found, and the region
  94    filled into RANGEP if non-NULL.  */
  95
  96 static bfd_boolean
  97 sh64_address_in_cranges (asection *cranges, bfd_vma addr,
  98                          sh64_elf_crange *rangep)
  99 {
 100   bfd_byte *cranges_contents;
 101   bfd_byte *found_rangep;
 102   bfd_size_type cranges_size = cranges->size;
 103
 104   /* If the size is not a multiple of the cranges entry size, then
 105      something is badly wrong.  */
 106   if ((cranges_size % SH64_CRANGE_SIZE) != 0)
 107     return FALSE;
 108
 109   /* If this section has relocations, then we can't do anything sane.  */
 110   if (bfd_get_section_flags (cranges->owner, cranges) & SEC_RELOC)
 111     return FALSE;
 112
 113   /* Has some kind soul (or previous call) left processed, sorted contents
 114      for us?  */
 115   if ((bfd_get_section_flags (cranges->owner, cranges) & SEC_IN_MEMORY)
 116       && elf_section_data (cranges)->this_hdr.sh_type == SHT_SH5_CR_SORTED)
 117     cranges_contents = cranges->contents;
 118   else
 119     {
 120       if (!bfd_malloc_and_get_section (cranges->owner, cranges,
 121                                        &cranges_contents))
 122         goto error_return;
 123
 124       /* Is it sorted?  */
 125       if (elf_section_data (cranges)->this_hdr.sh_type
 126           != SHT_SH5_CR_SORTED)
 127         /* Nope.  Lets sort it.  */
 128         qsort (cranges_contents, cranges_size / SH64_CRANGE_SIZE,
 129                SH64_CRANGE_SIZE,
 130                bfd_big_endian (cranges->owner)
 131                ? _bfd_sh64_crange_qsort_cmpb : _bfd_sh64_crange_qsort_cmpl);
 132
 133       /* Let's keep it around.  */
 134       cranges->contents = cranges_contents;
 135       bfd_set_section_flags (cranges->owner, cranges,
 136                              bfd_get_section_flags (cranges->owner, cranges)
 137                              | SEC_IN_MEMORY);
 138
 139       /* It's sorted now.  */
 140       elf_section_data (cranges)->this_hdr.sh_type = SHT_SH5_CR_SORTED;
 141     }
 142
 143   /* Try and find a matching range.  */
 144   found_rangep
 145     = bsearch (&addr, cranges_contents, cranges_size / SH64_CRANGE_SIZE,
 146                SH64_CRANGE_SIZE,
 147                bfd_big_endian (cranges->owner)
 148                ? _bfd_sh64_crange_bsearch_cmpb
 149                : _bfd_sh64_crange_bsearch_cmpl);
 150
 151   /* Fill in a few return values if we found a matching range.  */
 152   if (found_rangep)
 153     {
 154       enum sh64_elf_cr_type cr_type
 155         = bfd_get_16 (cranges->owner,
 156                       SH64_CRANGE_CR_TYPE_OFFSET + found_rangep);
 157       bfd_vma cr_addr
 158         = bfd_get_32 (cranges->owner,
 159                       SH64_CRANGE_CR_ADDR_OFFSET
 160                       + (char *) found_rangep);
 161       bfd_size_type cr_size
 162         = bfd_get_32 (cranges->owner,
 163                       SH64_CRANGE_CR_SIZE_OFFSET
 164                       + (char *) found_rangep);
 165
 166       rangep->cr_addr = cr_addr;
 167       rangep->cr_size = cr_size;
 168       rangep->cr_type = cr_type;
 169
 170       return TRUE;
 171     }
 172
 173   /* There is a .cranges section, but it does not have a descriptor
 174      matching this address.  */
 175   return FALSE;
 176
 177 error_return:
 178   if (cranges_contents != NULL)
 179     free (cranges_contents);
 180   return FALSE;
 181 }
 182
 183 /* Determine what ADDR points to in SEC, and fill in a range descriptor in
 184    *RANGEP if it's non-NULL.  */
 185
 186 enum sh64_elf_cr_type
 187 sh64_get_contents_type (asection *sec, bfd_vma addr, sh64_elf_crange *rangep)
 188 {
 189   asection *cranges;
 190
 191   /* Fill in the range with the boundaries of the section as a default.  */
 192   if (bfd_get_flavour (sec->owner) == bfd_target_elf_flavour
 193       && elf_elfheader (sec->owner)->e_type == ET_EXEC)
 194     {
 195       rangep->cr_addr = bfd_get_section_vma (sec->owner, sec);
 196       rangep->cr_size = sec->size;
 197       rangep->cr_type = CRT_NONE;
 198     }
 199   else
 200     return FALSE;
 201
 202   /* If none of the pertinent bits are set, then it's a SHcompact (or at
 203      least not SHmedia).  */
 204   if ((elf_section_data (sec)->this_hdr.sh_flags
 205        & (SHF_SH5_ISA32 | SHF_SH5_ISA32_MIXED)) == 0)
 206     {
 207       enum sh64_elf_cr_type cr_type
 208         = ((bfd_get_section_flags (sec->owner, sec) & SEC_CODE) != 0
 209            ? CRT_SH5_ISA16 : CRT_DATA);
 210       rangep->cr_type = cr_type;
 211       return cr_type;
 212     }
 213
 214   /* If only the SHF_SH5_ISA32 bit is set, then we have SHmedia.  */
 215   if ((elf_section_data (sec)->this_hdr.sh_flags
 216        & (SHF_SH5_ISA32 | SHF_SH5_ISA32_MIXED)) == SHF_SH5_ISA32)
 217     {
 218       rangep->cr_type = CRT_SH5_ISA32;
 219       return CRT_SH5_ISA32;
 220     }
 221
 222   /* Otherwise, we have to look up the .cranges section.  */
 223   cranges = bfd_get_section_by_name (sec->owner, SH64_CRANGES_SECTION_NAME);
 224
 225   if (cranges == NULL)
 226     /* A mixed section but there's no .cranges section.  This is probably
 227        bad input; it does not comply to specs.  */
 228     return CRT_NONE;
 229
 230   /* If this call fails, we will still have CRT_NONE in rangep->cr_type
 231      and that will be suitable to return.  */
 232   sh64_address_in_cranges (cranges, addr, rangep);
 233
 234   return rangep->cr_type;
 235 }
 236
 237 /* This is a simpler exported interface for the benefit of gdb et al.  */
 238
 239 bfd_boolean
 240 sh64_address_is_shmedia (asection *sec, bfd_vma addr)
 241 {
 242   sh64_elf_crange dummy;
 243   return sh64_get_contents_type (sec, addr, &dummy) == CRT_SH5_ISA32;
 244 }