| 1 | /* Motorola 68HC11/68HC12-specific support for 32-bit ELF |
| 2 | Copyright 2003, 2004, 2005, 2006, 2007, 2009, 2010 |
| 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 | /* Tweak the OSABI field of the elf header. */ |
| 180 | |
| 181 | extern void elf32_m68hc11_post_process_headers (bfd*, struct bfd_link_info*); |
| 182 | |
| 183 | int elf32_m68hc11_setup_section_lists (bfd *, struct bfd_link_info *); |
| 184 | |
| 185 | bfd_boolean elf32_m68hc11_size_stubs |
| 186 | (bfd *, bfd *, struct bfd_link_info *, |
| 187 | asection * (*) (const char *, asection *)); |
| 188 | |
| 189 | bfd_boolean elf32_m68hc11_build_stubs (bfd* abfd, struct bfd_link_info *); |
| 190 | #endif |