bfd/elf32-m68hc1x.h

   1 /* Motorola 68HC11/68HC12-specific support for 32-bit ELF
   2    Copyright (C) 2003-2024 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 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 #ifndef _ELF32_M68HC1X_H
  23 #define _ELF32_M68HC1X_H
  24
  25 #include "elf-bfd.h"
  26 #include "bfdlink.h"
  27 #include "elf/m68hc11.h"
  28
  29 /* Name of symbols exported by HC11/HC12 linker when there is a memory
  30    bank window.  */
  31 #define BFD_M68HC11_BANK_START_NAME   "__bank_start"
  32 #define BFD_M68HC11_BANK_SIZE_NAME    "__bank_size"
  33 #define BFD_M68HC11_BANK_VIRTUAL_NAME "__bank_virtual"
  34
  35 /* Set and control ELF flags in ELF header.  */
  36 extern bool _bfd_m68hc11_elf_merge_private_bfd_data
  37   (bfd *, struct bfd_link_info *);
  38 extern bool _bfd_m68hc11_elf_set_private_flags (bfd*,flagword);
  39 extern bool _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   bool (* size_one_stub)  (struct bfd_hash_entry*, void*);
 124   bool (* build_one_stub) (struct bfd_hash_entry*, void*);
 125 };
 126
 127 /* Get the Sparc64 ELF linker hash table from a link_info structure.  */
 128
 129 #define m68hc11_elf_hash_table(p) \
 130   ((is_elf_hash_table ((p)->hash)                                       \
 131     && elf_hash_table_id (elf_hash_table (p)) == M68HC11_ELF_DATA)      \
 132    ? (struct m68hc11_elf_link_hash_table *) (p)->hash : NULL)
 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
 139 extern void m68hc11_elf_get_bank_parameters (struct bfd_link_info*);
 140
 141 /* Return 1 if the address is in banked memory.
 142    This can be applied to a virtual address and to a physical address.  */
 143 extern int m68hc11_addr_is_banked (struct m68hc11_page_info*, bfd_vma);
 144
 145 /* Return the physical address seen by the processor, taking
 146    into account banked memory.  */
 147 extern bfd_vma m68hc11_phys_addr (struct m68hc11_page_info*, bfd_vma);
 148
 149 /* Return the page number corresponding to an address in banked memory.  */
 150 extern bfd_vma m68hc11_phys_page (struct m68hc11_page_info*, bfd_vma);
 151
 152 bfd_reloc_status_type m68hc11_elf_ignore_reloc
 153   (bfd *abfd, arelent *reloc_entry,
 154    asymbol *symbol, void *data, asection *input_section,
 155    bfd *output_bfd, char **error_message);
 156 bfd_reloc_status_type m68hc11_elf_special_reloc
 157   (bfd *abfd, arelent *reloc_entry,
 158     asymbol *symbol, void *data, asection *input_section,
 159     bfd *output_bfd, char **error_message);
 160
 161 bool elf32_m68hc11_check_relocs
 162   (bfd * abfd, struct bfd_link_info * info,
 163    asection * sec, const Elf_Internal_Rela * relocs);
 164 int elf32_m68hc11_relocate_section
 165   (bfd *output_bfd, struct bfd_link_info *info,
 166    bfd *input_bfd, asection *input_section,
 167    bfd_byte *contents, Elf_Internal_Rela *relocs,
 168    Elf_Internal_Sym *local_syms, asection **local_sections);
 169
 170 bool elf32_m68hc11_add_symbol_hook
 171   (bfd *abfd, struct bfd_link_info *info,
 172    Elf_Internal_Sym *sym, const char **namep,
 173    flagword *flagsp, asection **secp,
 174    bfd_vma *valp);
 175
 176 void elf32_m68hc11_merge_symbol_attribute
 177   (struct elf_link_hash_entry *, unsigned int, bool, bool);
 178
 179 /* Tweak the OSABI field of the elf header.  */
 180
 181 extern bool elf32_m68hc11_init_file_header (bfd*, struct bfd_link_info*);
 182
 183 int elf32_m68hc11_setup_section_lists (bfd *, struct bfd_link_info *);
 184
 185 bool elf32_m68hc11_size_stubs
 186   (bfd *, bfd *, struct bfd_link_info *,
 187    asection * (*) (const char *, asection *));
 188
 189 bool elf32_m68hc11_build_stubs (bfd* abfd, struct bfd_link_info *);
 190 #endif