190 lines
6.5 KiB
C
190 lines
6.5 KiB
C
/* Motorola 68HC11/68HC12-specific support for 32-bit ELF
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Copyright 2003, 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
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Contributed by Stephane Carrez (stcarrez@nerim.fr)
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This file is part of BFD, the Binary File Descriptor library.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
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MA 02110-1301, USA. */
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#ifndef _ELF32_M68HC1X_H
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#define _ELF32_M68HC1X_H
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#include "elf-bfd.h"
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#include "bfdlink.h"
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#include "elf/m68hc11.h"
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/* Name of symbols exported by HC11/HC12 linker when there is a memory
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bank window. */
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#define BFD_M68HC11_BANK_START_NAME "__bank_start"
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#define BFD_M68HC11_BANK_SIZE_NAME "__bank_size"
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#define BFD_M68HC11_BANK_VIRTUAL_NAME "__bank_virtual"
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/* Set and control ELF flags in ELF header. */
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extern bfd_boolean _bfd_m68hc11_elf_merge_private_bfd_data (bfd*,bfd*);
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extern bfd_boolean _bfd_m68hc11_elf_set_private_flags (bfd*,flagword);
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extern bfd_boolean _bfd_m68hc11_elf_print_private_bfd_data (bfd*, void*);
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/* This hash entry is used to record a trampoline that must be generated
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to call a far function using a normal calling convention ('jsr').
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The trampoline is used when a pointer to a far function is used.
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It takes care of installing the proper memory bank as well as creating
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the 'call/rtc' calling convention. */
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struct elf32_m68hc11_stub_hash_entry {
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/* Base hash table entry structure. */
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struct bfd_hash_entry root;
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/* The stub section. */
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asection *stub_sec;
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/* Offset within stub_sec of the beginning of this stub. */
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bfd_vma stub_offset;
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/* Given the symbol's value and its section we can determine its final
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value when building the stubs (so the stub knows where to jump. */
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bfd_vma target_value;
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asection *target_section;
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};
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/* Placeholder for the parameters to compute memory page and physical address.
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The following formulas are used:
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sym > bank_virtual =>
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%addr(sym) = (((sym - bank_virtual) & bank_mask) + bank_physical
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%page(sym) = (((sym - bank_virtual) >> bank_shift) % 256
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sym < bank_virtual =>
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%addr(sym) = sym
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%page(sym) = 0
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These parameters are obtained from the symbol table by looking
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at the following:
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__bank_start Symbol marking the start of memory bank window
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(bank_physical)
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__bank_virtual Logical address of symbols for which the transformation
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must be computed
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__bank_page_size Size in bytes of page size (this is *NOT* the memory
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bank window size and the window size is always
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less or equal to the page size)
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For 68HC12, the window is at 0x8000 and the page size is 16K (full window).
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For 68HC11 this is board specific (implemented by external hardware).
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*/
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struct m68hc11_page_info
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{
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bfd_vma bank_virtual;
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bfd_vma bank_physical;
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bfd_vma bank_physical_end;
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bfd_vma bank_mask;
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bfd_vma bank_size;
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int bank_shift;
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int bank_param_initialized;
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bfd_vma trampoline_addr;
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};
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struct m68hc11_elf_link_hash_table
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{
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struct elf_link_hash_table root;
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struct m68hc11_page_info pinfo;
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/* The stub hash table. */
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struct bfd_hash_table* stub_hash_table;
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/* Linker stub bfd. */
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bfd *stub_bfd;
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asection* stub_section;
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asection* tramp_section;
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/* Linker call-backs. */
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asection * (*add_stub_section) PARAMS ((const char *, asection *));
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/* Assorted information used by elf32_hppa_size_stubs. */
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unsigned int bfd_count;
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int top_index;
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asection **input_list;
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/* Small local sym to section mapping cache. */
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struct sym_sec_cache sym_sec;
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bfd_boolean (* size_one_stub) PARAMS((struct bfd_hash_entry*, void*));
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bfd_boolean (* build_one_stub) PARAMS((struct bfd_hash_entry*, void*));
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};
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/* Get the Sparc64 ELF linker hash table from a link_info structure. */
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#define m68hc11_elf_hash_table(p) \
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((struct m68hc11_elf_link_hash_table *) ((p)->hash))
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/* Create a 68HC11/68HC12 ELF linker hash table. */
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extern struct m68hc11_elf_link_hash_table* m68hc11_elf_hash_table_create
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(bfd*);
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extern void m68hc11_elf_bfd_link_hash_table_free (struct bfd_link_hash_table*);
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extern void m68hc11_elf_get_bank_parameters (struct bfd_link_info*);
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/* Return 1 if the address is in banked memory.
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This can be applied to a virtual address and to a physical address. */
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extern int m68hc11_addr_is_banked (struct m68hc11_page_info*, bfd_vma);
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/* Return the physical address seen by the processor, taking
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into account banked memory. */
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extern bfd_vma m68hc11_phys_addr (struct m68hc11_page_info*, bfd_vma);
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/* Return the page number corresponding to an address in banked memory. */
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extern bfd_vma m68hc11_phys_page (struct m68hc11_page_info*, bfd_vma);
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bfd_reloc_status_type m68hc11_elf_ignore_reloc
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(bfd *abfd, arelent *reloc_entry,
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asymbol *symbol, void *data, asection *input_section,
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bfd *output_bfd, char **error_message);
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bfd_reloc_status_type m68hc11_elf_special_reloc
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(bfd *abfd, arelent *reloc_entry,
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asymbol *symbol, void *data, asection *input_section,
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bfd *output_bfd, char **error_message);
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bfd_boolean elf32_m68hc11_check_relocs
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(bfd * abfd, struct bfd_link_info * info,
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asection * sec, const Elf_Internal_Rela * relocs);
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bfd_boolean elf32_m68hc11_relocate_section
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(bfd *output_bfd, struct bfd_link_info *info,
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bfd *input_bfd, asection *input_section,
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bfd_byte *contents, Elf_Internal_Rela *relocs,
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Elf_Internal_Sym *local_syms, asection **local_sections);
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bfd_boolean elf32_m68hc11_add_symbol_hook
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(bfd *abfd, struct bfd_link_info *info,
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Elf_Internal_Sym *sym, const char **namep,
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flagword *flagsp, asection **secp,
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bfd_vma *valp);
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/* Tweak the OSABI field of the elf header. */
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extern void elf32_m68hc11_post_process_headers (bfd*, struct bfd_link_info*);
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int elf32_m68hc11_setup_section_lists (bfd *, struct bfd_link_info *);
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bfd_boolean elf32_m68hc11_size_stubs
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(bfd *, bfd *, struct bfd_link_info *,
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asection * (*) (const char *, asection *));
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bfd_boolean elf32_m68hc11_build_stubs (bfd* abfd, struct bfd_link_info *);
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#endif
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