bfd/elf32-m68hc1x.h

   1 /* Motorola 68HC11/68HC12-specific support for 32-bit ELF
   2    Copyright 2003, 2004 Free Software Foundation, Inc.
   3    Contributed by Stephane Carrez (stcarrez@nerim.fr)
   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 2 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, MA 02110-1301, USA.  */
  20
  21 #ifndef _ELF32_M68HC1X_H
  22 #define _ELF32_M68HC1X_H
  23
  24 #include "elf-bfd.h"
  25 #include "bfdlink.h"
  26 #include "elf/m68hc11.h"
  27
  28 /* Name of symbols exported by HC11/HC12 linker when there is a memory
  29    bank window.  */
  30 #define BFD_M68HC11_BANK_START_NAME   "__bank_start"
  31 #define BFD_M68HC11_BANK_SIZE_NAME    "__bank_size"
  32 #define BFD_M68HC11_BANK_VIRTUAL_NAME "__bank_virtual"
  33
  34 /* Set and control ELF flags in ELF header.  */
  35 extern bfd_boolean _bfd_m68hc11_elf_merge_private_bfd_data (bfd*,bfd*);
  36 extern bfd_boolean _bfd_m68hc11_elf_set_private_flags (bfd*,flagword);
  37 extern bfd_boolean _bfd_m68hc11_elf_print_private_bfd_data (bfd*, void*);
  38
  39 /* This hash entry is used to record a trampoline that must be generated
  40    to call a far function using a normal calling convention ('jsr').
  41    The trampoline is used when a pointer to a far function is used.
  42    It takes care of installing the proper memory bank as well as creating
  43    the 'call/rtc' calling convention.  */
  44 struct elf32_m68hc11_stub_hash_entry {
  45
  46   /* Base hash table entry structure.  */
  47   struct bfd_hash_entry root;
  48
  49   /* The stub section.  */
  50   asection *stub_sec;
  51
  52   /* Offset within stub_sec of the beginning of this stub.  */
  53   bfd_vma stub_offset;
  54
  55   /* Given the symbol's value and its section we can determine its final
  56      value when building the stubs (so the stub knows where to jump.  */
  57   bfd_vma target_value;
  58   asection *target_section;
  59 };
  60
  61 /* Placeholder for the parameters to compute memory page and physical address.
  62    The following formulas are used:
  63
  64    sym > bank_virtual =>
  65      %addr(sym) = (((sym - bank_virtual) & bank_mask) + bank_physical
  66      %page(sym) = (((sym - bank_virtual) >> bank_shift) % 256
  67
  68    sym < bank_virtual =>
  69      %addr(sym) = sym
  70      %page(sym) = 0
  71
  72
  73    These parameters are obtained from the symbol table by looking
  74    at the following:
  75
  76    __bank_start         Symbol marking the start of memory bank window
  77                         (bank_physical)
  78    __bank_virtual       Logical address of symbols for which the transformation
  79                         must be computed
  80    __bank_page_size     Size in bytes of page size (this is *NOT* the memory
  81                         bank window size and the window size is always
  82                         less or equal to the page size)
  83
  84    For 68HC12, the window is at 0x8000 and the page size is 16K (full window).
  85    For 68HC11 this is board specific (implemented by external hardware).
  86
  87 */
  88 struct m68hc11_page_info
  89 {
  90   bfd_vma bank_virtual;
  91   bfd_vma bank_physical;
  92   bfd_vma bank_physical_end;
  93   bfd_vma bank_mask;
  94   bfd_vma bank_size;
  95   int bank_shift;
  96   int bank_param_initialized;
  97   bfd_vma trampoline_addr;
  98 };
  99
 100 struct m68hc11_elf_link_hash_table
 101 {
 102   struct elf_link_hash_table root;
 103   struct m68hc11_page_info pinfo;
 104
 105   /* The stub hash table.  */
 106   struct bfd_hash_table* stub_hash_table;
 107
 108   /* Linker stub bfd.  */
 109   bfd *stub_bfd;
 110
 111   asection* stub_section;
 112   asection* tramp_section;
 113
 114   /* Linker call-backs.  */
 115   asection * (*add_stub_section) PARAMS ((const char *, asection *));
 116
 117   /* Assorted information used by elf32_hppa_size_stubs.  */
 118   unsigned int bfd_count;
 119   int top_index;
 120   asection **input_list;
 121
 122   /* Small local sym to section mapping cache.  */
 123   struct sym_sec_cache sym_sec;
 124
 125   bfd_boolean (* size_one_stub) PARAMS((struct bfd_hash_entry*, void*));
 126   bfd_boolean (* build_one_stub) PARAMS((struct bfd_hash_entry*, void*));
 127 };
 128
 129 /* Get the Sparc64 ELF linker hash table from a link_info structure.  */
 130
 131 #define m68hc11_elf_hash_table(p) \
 132   ((struct m68hc11_elf_link_hash_table *) ((p)->hash))
 133
 134 /* Create a 68HC11/68HC12 ELF linker hash table.  */
 135
 136 extern struct m68hc11_elf_link_hash_table* m68hc11_elf_hash_table_create
 137   (bfd*);
 138 extern void m68hc11_elf_bfd_link_hash_table_free (struct bfd_link_hash_table*);
 139
 140 extern void m68hc11_elf_get_bank_parameters (struct bfd_link_info*);
 141
 142 /* Return 1 if the address is in banked memory.
 143    This can be applied to a virtual address and to a physical address.  */
 144 extern int m68hc11_addr_is_banked (struct m68hc11_page_info*, bfd_vma);
 145
 146 /* Return the physical address seen by the processor, taking
 147    into account banked memory.  */
 148 extern bfd_vma m68hc11_phys_addr (struct m68hc11_page_info*, bfd_vma);
 149
 150 /* Return the page number corresponding to an address in banked memory.  */
 151 extern bfd_vma m68hc11_phys_page (struct m68hc11_page_info*, bfd_vma);
 152
 153 bfd_reloc_status_type m68hc11_elf_ignore_reloc
 154   (bfd *abfd, arelent *reloc_entry,
 155    asymbol *symbol, void *data, asection *input_section,
 156    bfd *output_bfd, char **error_message);
 157 bfd_reloc_status_type m68hc11_elf_special_reloc
 158   (bfd *abfd, arelent *reloc_entry,
 159     asymbol *symbol, void *data, asection *input_section,
 160     bfd *output_bfd, char **error_message);
 161
 162 /* GC mark and sweep.  */
 163 asection *elf32_m68hc11_gc_mark_hook
 164   (asection *sec, struct bfd_link_info *info,
 165    Elf_Internal_Rela *rel, struct elf_link_hash_entry *h,
 166    Elf_Internal_Sym *sym);
 167 bfd_boolean elf32_m68hc11_gc_sweep_hook
 168   (bfd *abfd, struct bfd_link_info *info,
 169    asection *sec, const Elf_Internal_Rela *relocs);
 170 bfd_boolean elf32_m68hc11_check_relocs
 171   (bfd * abfd, struct bfd_link_info * info,
 172    asection * sec, const Elf_Internal_Rela * relocs);
 173 bfd_boolean elf32_m68hc11_relocate_section
 174   (bfd *output_bfd, struct bfd_link_info *info,
 175    bfd *input_bfd, asection *input_section,
 176    bfd_byte *contents, Elf_Internal_Rela *relocs,
 177    Elf_Internal_Sym *local_syms, asection **local_sections);
 178
 179 bfd_boolean elf32_m68hc11_add_symbol_hook
 180   (bfd *abfd, struct bfd_link_info *info,
 181    Elf_Internal_Sym *sym, const char **namep,
 182    flagword *flagsp, asection **secp,
 183    bfd_vma *valp);
 184
 185 /* Tweak the OSABI field of the elf header.  */
 186
 187 extern void elf32_m68hc11_post_process_headers (bfd*, struct bfd_link_info*);
 188
 189 int elf32_m68hc11_setup_section_lists (bfd *, struct bfd_link_info *);
 190
 191 bfd_boolean elf32_m68hc11_size_stubs
 192   (bfd *, bfd *, struct bfd_link_info *,
 193    asection * (*) (const char *, asection *));
 194
 195 bfd_boolean elf32_m68hc11_build_stubs (bfd* abfd, struct bfd_link_info *);
 196 #endif