bfd/elf32-m68hc1x.h

   1 /* Motorola 68HC11/68HC12-specific support for 32-bit ELF
   2    Copyright 2003, 2004, 2005, 2006, 2007, 2009, 2010, 2012
   3    Free Software Foundation, Inc.
   4    Contributed by Stephane Carrez (stcarrez@nerim.fr)
   5
   6    This file is part of BFD, the Binary File Descriptor library.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  21    MA 02110-1301, USA.  */
  22
  23 #ifndef _ELF32_M68HC1X_H
  24 #define _ELF32_M68HC1X_H
  25
  26 #include "elf-bfd.h"
  27 #include "bfdlink.h"
  28 #include "elf/m68hc11.h"
  29
  30 /* Name of symbols exported by HC11/HC12 linker when there is a memory
  31    bank window.  */
  32 #define BFD_M68HC11_BANK_START_NAME   "__bank_start"
  33 #define BFD_M68HC11_BANK_SIZE_NAME    "__bank_size"
  34 #define BFD_M68HC11_BANK_VIRTUAL_NAME "__bank_virtual"
  35
  36 /* Set and control ELF flags in ELF header.  */
  37 extern bfd_boolean _bfd_m68hc11_elf_merge_private_bfd_data (bfd*,bfd*);
  38 extern bfd_boolean _bfd_m68hc11_elf_set_private_flags (bfd*,flagword);
  39 extern bfd_boolean _bfd_m68hc11_elf_print_private_bfd_data (bfd*, void*);
  40
  41 /* This hash entry is used to record a trampoline that must be generated
  42    to call a far function using a normal calling convention ('jsr').
  43    The trampoline is used when a pointer to a far function is used.
  44    It takes care of installing the proper memory bank as well as creating
  45    the 'call/rtc' calling convention.  */
  46 struct elf32_m68hc11_stub_hash_entry
  47 {
  48   /* Base hash table entry structure.  */
  49   struct bfd_hash_entry root;
  50
  51   /* The stub section.  */
  52   asection *stub_sec;
  53
  54   /* Offset within stub_sec of the beginning of this stub.  */
  55   bfd_vma stub_offset;
  56
  57   /* Given the symbol's value and its section we can determine its final
  58      value when building the stubs (so the stub knows where to jump.  */
  59   bfd_vma target_value;
  60   asection *target_section;
  61 };
  62
  63 /* Placeholder for the parameters to compute memory page and physical address.
  64    The following formulas are used:
  65
  66    sym > bank_virtual =>
  67      %addr(sym) = (((sym - bank_virtual) & bank_mask) + bank_physical
  68      %page(sym) = (((sym - bank_virtual) >> bank_shift) % 256
  69
  70    sym < bank_virtual =>
  71      %addr(sym) = sym
  72      %page(sym) = 0
  73
  74
  75    These parameters are obtained from the symbol table by looking
  76    at the following:
  77
  78    __bank_start         Symbol marking the start of memory bank window
  79                         (bank_physical)
  80    __bank_virtual       Logical address of symbols for which the transformation
  81                         must be computed
  82    __bank_page_size     Size in bytes of page size (this is *NOT* the memory
  83                         bank window size and the window size is always
  84                         less or equal to the page size)
  85
  86    For 68HC12, the window is at 0x8000 and the page size is 16K (full window).
  87    For 68HC11 this is board specific (implemented by external hardware).  */
  88
  89 struct m68hc11_page_info
  90 {
  91   bfd_vma bank_virtual;
  92   bfd_vma bank_physical;
  93   bfd_vma bank_physical_end;
  94   bfd_vma bank_mask;
  95   bfd_vma bank_size;
  96   int bank_shift;
  97   int bank_param_initialized;
  98   bfd_vma trampoline_addr;
  99 };
 100
 101 struct m68hc11_elf_link_hash_table
 102 {
 103   struct elf_link_hash_table root;
 104   struct m68hc11_page_info pinfo;
 105
 106   /* The stub hash table.  */
 107   struct bfd_hash_table* stub_hash_table;
 108
 109   /* Linker stub bfd.  */
 110   bfd *stub_bfd;
 111
 112   asection* stub_section;
 113   asection* tramp_section;
 114
 115   /* Linker call-backs.  */
 116   asection * (*add_stub_section) (const char *, asection *);
 117
 118   /* Assorted information used by elf32_hppa_size_stubs.  */
 119   unsigned int bfd_count;
 120   int top_index;
 121   asection **input_list;
 122
 123   /* Small local sym cache.  */
 124   struct sym_cache sym_cache;
 125
 126   bfd_boolean (* size_one_stub)  (struct bfd_hash_entry*, void*);
 127   bfd_boolean (* build_one_stub) (struct bfd_hash_entry*, void*);
 128 };
 129
 130 /* Get the Sparc64 ELF linker hash table from a link_info structure.  */
 131
 132 #define m68hc11_elf_hash_table(p) \
 133   (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
 134   == M68HC11_ELF_DATA ? ((struct m68hc11_elf_link_hash_table *) ((p)->hash)) : NULL)
 135
 136 /* Create a 68HC11/68HC12 ELF linker hash table.  */
 137
 138 extern struct m68hc11_elf_link_hash_table* m68hc11_elf_hash_table_create
 139   (bfd*);
 140 extern void m68hc11_elf_bfd_link_hash_table_free (struct bfd_link_hash_table*);
 141
 142 extern void m68hc11_elf_get_bank_parameters (struct bfd_link_info*);
 143
 144 /* Return 1 if the address is in banked memory.
 145    This can be applied to a virtual address and to a physical address.  */
 146 extern int m68hc11_addr_is_banked (struct m68hc11_page_info*, bfd_vma);
 147
 148 /* Return the physical address seen by the processor, taking
 149    into account banked memory.  */
 150 extern bfd_vma m68hc11_phys_addr (struct m68hc11_page_info*, bfd_vma);
 151
 152 /* Return the page number corresponding to an address in banked memory.  */
 153 extern bfd_vma m68hc11_phys_page (struct m68hc11_page_info*, bfd_vma);
 154
 155 bfd_reloc_status_type m68hc11_elf_ignore_reloc
 156   (bfd *abfd, arelent *reloc_entry,
 157    asymbol *symbol, void *data, asection *input_section,
 158    bfd *output_bfd, char **error_message);
 159 bfd_reloc_status_type m68hc11_elf_special_reloc
 160   (bfd *abfd, arelent *reloc_entry,
 161     asymbol *symbol, void *data, asection *input_section,
 162     bfd *output_bfd, char **error_message);
 163
 164 bfd_boolean elf32_m68hc11_check_relocs
 165   (bfd * abfd, struct bfd_link_info * info,
 166    asection * sec, const Elf_Internal_Rela * relocs);
 167 bfd_boolean elf32_m68hc11_relocate_section
 168   (bfd *output_bfd, struct bfd_link_info *info,
 169    bfd *input_bfd, asection *input_section,
 170    bfd_byte *contents, Elf_Internal_Rela *relocs,
 171    Elf_Internal_Sym *local_syms, asection **local_sections);
 172
 173 bfd_boolean elf32_m68hc11_add_symbol_hook
 174   (bfd *abfd, struct bfd_link_info *info,
 175    Elf_Internal_Sym *sym, const char **namep,
 176    flagword *flagsp, asection **secp,
 177    bfd_vma *valp);
 178
 179 void elf32_m68hc11_merge_symbol_attribute
 180   (struct elf_link_hash_entry *, const Elf_Internal_Sym *,
 181    bfd_boolean, bfd_boolean);
 182
 183 /* Tweak the OSABI field of the elf header.  */
 184
 185 extern void elf32_m68hc11_post_process_headers (bfd*, struct bfd_link_info*);
 186
 187 int elf32_m68hc11_setup_section_lists (bfd *, struct bfd_link_info *);
 188
 189 bfd_boolean elf32_m68hc11_size_stubs
 190   (bfd *, bfd *, struct bfd_link_info *,
 191    asection * (*) (const char *, asection *));
 192
 193 bfd_boolean elf32_m68hc11_build_stubs (bfd* abfd, struct bfd_link_info *);
 194 #endif