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[/] [openrisc/] [trunk/] [gnu-src/] [binutils-2.18.50/] [bfd/] [elf32-m68hc12.c] - Rev 179
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/* Motorola 68HC12-specific support for 32-bit ELF Copyright 1999, 2000, 2002, 2003, 2004, 2005, 2006, 2007 Free Software Foundation, Inc. Contributed by Stephane Carrez (stcarrez@nerim.fr) (Heavily copied from the D10V port by Martin Hunt (hunt@cygnus.com)) This file is part of BFD, the Binary File Descriptor library. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */ #include "sysdep.h" #include "bfd.h" #include "bfdlink.h" #include "libbfd.h" #include "elf-bfd.h" #include "elf32-m68hc1x.h" #include "elf/m68hc11.h" #include "opcode/m68hc11.h" /* Relocation functions. */ static reloc_howto_type *bfd_elf32_bfd_reloc_type_lookup (bfd *, bfd_reloc_code_real_type); static void m68hc11_info_to_howto_rel (bfd *, arelent *, Elf_Internal_Rela *); /* Trampoline generation. */ static bfd_boolean m68hc12_elf_size_one_stub (struct bfd_hash_entry *gen_entry, void *in_arg); static bfd_boolean m68hc12_elf_build_one_stub (struct bfd_hash_entry *gen_entry, void *in_arg); static struct bfd_link_hash_table* m68hc12_elf_bfd_link_hash_table_create (bfd*); static bfd_boolean m68hc12_elf_set_mach_from_flags PARAMS ((bfd *)); /* Use REL instead of RELA to save space */ #define USE_REL 1 /* The 68HC12 microcontroler has a memory bank switching system with a 16Kb window in the 64Kb address space. The extended memory is mapped in the 16Kb window (at 0x8000). The page register controls which 16Kb bank is mapped. The call/rtc instructions take care of bank switching in function calls/returns. For GNU Binutils to work, we consider there is a physical memory at 0..0x0ffff and a kind of virtual memory above that. Symbols in virtual memory have their addresses treated in a special way when disassembling and when linking. For the linker to work properly, we must always relocate the virtual memory as if it is mapped at 0x8000. When a 16-bit relocation is made in the virtual memory, we check that it does not cross the memory bank where it is used. This would involve a page change which would be wrong. The 24-bit relocation is for that and it treats the address as a physical address + page number. Banked Address Space | | Page n +---------------+ 0x1010000 | | | jsr _foo | | .. | Page 3 | _foo: | +---------------+ 0x100C000 | | | call _bar | | .. | Page 2 | _bar: | +---------------+ 0x1008000 /------>| | | | call _foo | Page 1 | | | | +---------------+ 0x1004000 Physical | | | Address Space | | | Page 0 | | | +-----------+ 0x00FFFF | +---------------+ 0x1000000 | | | | call _foo | | | | | +-----------+ 0x00BFFF -+---/ | | | | | | | | 16K | | | | +-----------+ 0x008000 -+ | | | | = = | | | | +-----------+ 0000 The 'call _foo' must be relocated with page 3 and 16-bit address mapped at 0x8000. The 3-bit and 16-bit PC rel relocation is only used by 68HC12. */ static reloc_howto_type elf_m68hc11_howto_table[] = { /* This reloc does nothing. */ HOWTO (R_M68HC11_NONE, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 32, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont,/* complain_on_overflow */ bfd_elf_generic_reloc, /* special_function */ "R_M68HC12_NONE", /* name */ FALSE, /* partial_inplace */ 0, /* src_mask */ 0, /* dst_mask */ FALSE), /* pcrel_offset */ /* A 8 bit absolute relocation */ HOWTO (R_M68HC11_8, /* type */ 0, /* rightshift */ 0, /* size (0 = byte, 1 = short, 2 = long) */ 8, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_bitfield, /* complain_on_overflow */ bfd_elf_generic_reloc, /* special_function */ "R_M68HC12_8", /* name */ FALSE, /* partial_inplace */ 0x00ff, /* src_mask */ 0x00ff, /* dst_mask */ FALSE), /* pcrel_offset */ /* A 8 bit absolute relocation (upper address) */ HOWTO (R_M68HC11_HI8, /* type */ 8, /* rightshift */ 0, /* size (0 = byte, 1 = short, 2 = long) */ 8, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_bitfield, /* complain_on_overflow */ bfd_elf_generic_reloc, /* special_function */ "R_M68HC12_HI8", /* name */ FALSE, /* partial_inplace */ 0x00ff, /* src_mask */ 0x00ff, /* dst_mask */ FALSE), /* pcrel_offset */ /* A 8 bit absolute relocation (upper address) */ HOWTO (R_M68HC11_LO8, /* type */ 0, /* rightshift */ 0, /* size (0 = byte, 1 = short, 2 = long) */ 8, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ bfd_elf_generic_reloc, /* special_function */ "R_M68HC12_LO8", /* name */ FALSE, /* partial_inplace */ 0x00ff, /* src_mask */ 0x00ff, /* dst_mask */ FALSE), /* pcrel_offset */ /* A 8 bit PC-rel relocation */ HOWTO (R_M68HC11_PCREL_8, /* type */ 0, /* rightshift */ 0, /* size (0 = byte, 1 = short, 2 = long) */ 8, /* bitsize */ TRUE, /* pc_relative */ 0, /* bitpos */ complain_overflow_bitfield, /* complain_on_overflow */ bfd_elf_generic_reloc, /* special_function */ "R_M68HC12_PCREL_8", /* name */ FALSE, /* partial_inplace */ 0x00ff, /* src_mask */ 0x00ff, /* dst_mask */ TRUE), /* pcrel_offset */ /* A 16 bit absolute relocation */ HOWTO (R_M68HC11_16, /* type */ 0, /* rightshift */ 1, /* size (0 = byte, 1 = short, 2 = long) */ 16, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont /*bitfield */ , /* complain_on_overflow */ bfd_elf_generic_reloc, /* special_function */ "R_M68HC12_16", /* name */ FALSE, /* partial_inplace */ 0xffff, /* src_mask */ 0xffff, /* dst_mask */ FALSE), /* pcrel_offset */ /* A 32 bit absolute relocation. This one is never used for the code relocation. It's used by gas for -gstabs generation. */ HOWTO (R_M68HC11_32, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 32, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_bitfield, /* complain_on_overflow */ bfd_elf_generic_reloc, /* special_function */ "R_M68HC12_32", /* name */ FALSE, /* partial_inplace */ 0xffffffff, /* src_mask */ 0xffffffff, /* dst_mask */ FALSE), /* pcrel_offset */ /* A 3 bit absolute relocation */ HOWTO (R_M68HC11_3B, /* type */ 0, /* rightshift */ 0, /* size (0 = byte, 1 = short, 2 = long) */ 3, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_bitfield, /* complain_on_overflow */ bfd_elf_generic_reloc, /* special_function */ "R_M68HC12_4B", /* name */ FALSE, /* partial_inplace */ 0x003, /* src_mask */ 0x003, /* dst_mask */ FALSE), /* pcrel_offset */ /* A 16 bit PC-rel relocation */ HOWTO (R_M68HC11_PCREL_16, /* type */ 0, /* rightshift */ 1, /* size (0 = byte, 1 = short, 2 = long) */ 16, /* bitsize */ TRUE, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ bfd_elf_generic_reloc, /* special_function */ "R_M68HC12_PCREL_16", /* name */ FALSE, /* partial_inplace */ 0xffff, /* src_mask */ 0xffff, /* dst_mask */ TRUE), /* pcrel_offset */ /* GNU extension to record C++ vtable hierarchy */ HOWTO (R_M68HC11_GNU_VTINHERIT, /* type */ 0, /* rightshift */ 1, /* size (0 = byte, 1 = short, 2 = long) */ 0, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ NULL, /* special_function */ "R_M68HC11_GNU_VTINHERIT", /* name */ FALSE, /* partial_inplace */ 0, /* src_mask */ 0, /* dst_mask */ FALSE), /* pcrel_offset */ /* GNU extension to record C++ vtable member usage */ HOWTO (R_M68HC11_GNU_VTENTRY, /* type */ 0, /* rightshift */ 1, /* size (0 = byte, 1 = short, 2 = long) */ 0, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ _bfd_elf_rel_vtable_reloc_fn, /* special_function */ "R_M68HC11_GNU_VTENTRY", /* name */ FALSE, /* partial_inplace */ 0, /* src_mask */ 0, /* dst_mask */ FALSE), /* pcrel_offset */ /* A 24 bit relocation */ HOWTO (R_M68HC11_24, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 24, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ m68hc11_elf_special_reloc, /* special_function */ "R_M68HC12_24", /* name */ FALSE, /* partial_inplace */ 0xffffff, /* src_mask */ 0xffffff, /* dst_mask */ FALSE), /* pcrel_offset */ /* A 16-bit low relocation */ HOWTO (R_M68HC11_LO16, /* type */ 0, /* rightshift */ 1, /* size (0 = byte, 1 = short, 2 = long) */ 16, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ m68hc11_elf_special_reloc,/* special_function */ "R_M68HC12_LO16", /* name */ FALSE, /* partial_inplace */ 0xffff, /* src_mask */ 0xffff, /* dst_mask */ FALSE), /* pcrel_offset */ /* A page relocation */ HOWTO (R_M68HC11_PAGE, /* type */ 0, /* rightshift */ 0, /* size (0 = byte, 1 = short, 2 = long) */ 8, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ m68hc11_elf_special_reloc,/* special_function */ "R_M68HC12_PAGE", /* name */ FALSE, /* partial_inplace */ 0x00ff, /* src_mask */ 0x00ff, /* dst_mask */ FALSE), /* pcrel_offset */ EMPTY_HOWTO (14), EMPTY_HOWTO (15), EMPTY_HOWTO (16), EMPTY_HOWTO (17), EMPTY_HOWTO (18), EMPTY_HOWTO (19), /* Mark beginning of a jump instruction (any form). */ HOWTO (R_M68HC11_RL_JUMP, /* type */ 0, /* rightshift */ 1, /* size (0 = byte, 1 = short, 2 = long) */ 0, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ m68hc11_elf_ignore_reloc, /* special_function */ "R_M68HC12_RL_JUMP", /* name */ TRUE, /* partial_inplace */ 0, /* src_mask */ 0, /* dst_mask */ TRUE), /* pcrel_offset */ /* Mark beginning of Gcc relaxation group instruction. */ HOWTO (R_M68HC11_RL_GROUP, /* type */ 0, /* rightshift */ 1, /* size (0 = byte, 1 = short, 2 = long) */ 0, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ m68hc11_elf_ignore_reloc, /* special_function */ "R_M68HC12_RL_GROUP", /* name */ TRUE, /* partial_inplace */ 0, /* src_mask */ 0, /* dst_mask */ TRUE), /* pcrel_offset */ }; /* Map BFD reloc types to M68HC11 ELF reloc types. */ struct m68hc11_reloc_map { bfd_reloc_code_real_type bfd_reloc_val; unsigned char elf_reloc_val; }; static const struct m68hc11_reloc_map m68hc11_reloc_map[] = { {BFD_RELOC_NONE, R_M68HC11_NONE,}, {BFD_RELOC_8, R_M68HC11_8}, {BFD_RELOC_M68HC11_HI8, R_M68HC11_HI8}, {BFD_RELOC_M68HC11_LO8, R_M68HC11_LO8}, {BFD_RELOC_8_PCREL, R_M68HC11_PCREL_8}, {BFD_RELOC_16_PCREL, R_M68HC11_PCREL_16}, {BFD_RELOC_16, R_M68HC11_16}, {BFD_RELOC_32, R_M68HC11_32}, {BFD_RELOC_M68HC11_3B, R_M68HC11_3B}, {BFD_RELOC_VTABLE_INHERIT, R_M68HC11_GNU_VTINHERIT}, {BFD_RELOC_VTABLE_ENTRY, R_M68HC11_GNU_VTENTRY}, {BFD_RELOC_M68HC11_LO16, R_M68HC11_LO16}, {BFD_RELOC_M68HC11_PAGE, R_M68HC11_PAGE}, {BFD_RELOC_M68HC11_24, R_M68HC11_24}, {BFD_RELOC_M68HC11_RL_JUMP, R_M68HC11_RL_JUMP}, {BFD_RELOC_M68HC11_RL_GROUP, R_M68HC11_RL_GROUP}, }; static reloc_howto_type * bfd_elf32_bfd_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, bfd_reloc_code_real_type code) { unsigned int i; for (i = 0; i < sizeof (m68hc11_reloc_map) / sizeof (struct m68hc11_reloc_map); i++) { if (m68hc11_reloc_map[i].bfd_reloc_val == code) return &elf_m68hc11_howto_table[m68hc11_reloc_map[i].elf_reloc_val]; } return NULL; } static reloc_howto_type * bfd_elf32_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, const char *r_name) { unsigned int i; for (i = 0; i < (sizeof (elf_m68hc11_howto_table) / sizeof (elf_m68hc11_howto_table[0])); i++) if (elf_m68hc11_howto_table[i].name != NULL && strcasecmp (elf_m68hc11_howto_table[i].name, r_name) == 0) return &elf_m68hc11_howto_table[i]; return NULL; } /* Set the howto pointer for an M68HC11 ELF reloc. */ static void m68hc11_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED, arelent *cache_ptr, Elf_Internal_Rela *dst) { unsigned int r_type; r_type = ELF32_R_TYPE (dst->r_info); BFD_ASSERT (r_type < (unsigned int) R_M68HC11_max); cache_ptr->howto = &elf_m68hc11_howto_table[r_type]; } /* Far trampoline generation. */ /* Build a 68HC12 trampoline stub. */ static bfd_boolean m68hc12_elf_build_one_stub (struct bfd_hash_entry *gen_entry, void *in_arg) { struct elf32_m68hc11_stub_hash_entry *stub_entry; struct bfd_link_info *info; struct m68hc11_elf_link_hash_table *htab; asection *stub_sec; bfd *stub_bfd; bfd_byte *loc; bfd_vma sym_value, phys_page, phys_addr; /* Massage our args to the form they really have. */ stub_entry = (struct elf32_m68hc11_stub_hash_entry *) gen_entry; info = (struct bfd_link_info *) in_arg; htab = m68hc11_elf_hash_table (info); stub_sec = stub_entry->stub_sec; /* Make a note of the offset within the stubs for this entry. */ stub_entry->stub_offset = stub_sec->size; stub_sec->size += 7; loc = stub_sec->contents + stub_entry->stub_offset; stub_bfd = stub_sec->owner; /* Create the trampoline call stub: ldy #%addr(symbol) call %page(symbol), __trampoline */ sym_value = (stub_entry->target_value + stub_entry->target_section->output_offset + stub_entry->target_section->output_section->vma); phys_addr = m68hc11_phys_addr (&htab->pinfo, sym_value); phys_page = m68hc11_phys_page (&htab->pinfo, sym_value); /* ldy #%page(sym) */ bfd_put_8 (stub_bfd, 0xCD, loc); bfd_put_16 (stub_bfd, phys_addr, loc + 1); loc += 3; /* call %page(sym), __trampoline */ bfd_put_8 (stub_bfd, 0x4a, loc); bfd_put_16 (stub_bfd, htab->pinfo.trampoline_addr, loc + 1); bfd_put_8 (stub_bfd, phys_page, loc + 3); return TRUE; } /* As above, but don't actually build the stub. Just bump offset so we know stub section sizes. */ static bfd_boolean m68hc12_elf_size_one_stub (struct bfd_hash_entry *gen_entry, void *in_arg ATTRIBUTE_UNUSED) { struct elf32_m68hc11_stub_hash_entry *stub_entry; /* Massage our args to the form they really have. */ stub_entry = (struct elf32_m68hc11_stub_hash_entry *) gen_entry; stub_entry->stub_sec->size += 7; return TRUE; } /* Create a 68HC12 ELF linker hash table. */ static struct bfd_link_hash_table * m68hc12_elf_bfd_link_hash_table_create (bfd *abfd) { struct m68hc11_elf_link_hash_table *ret; ret = m68hc11_elf_hash_table_create (abfd); if (ret == (struct m68hc11_elf_link_hash_table *) NULL) return NULL; ret->size_one_stub = m68hc12_elf_size_one_stub; ret->build_one_stub = m68hc12_elf_build_one_stub; return &ret->root.root; } static bfd_boolean m68hc12_elf_set_mach_from_flags (bfd *abfd) { flagword flags = elf_elfheader (abfd)->e_flags; switch (flags & EF_M68HC11_MACH_MASK) { case EF_M68HC12_MACH: bfd_default_set_arch_mach (abfd, bfd_arch_m68hc12, bfd_mach_m6812); break; case EF_M68HCS12_MACH: bfd_default_set_arch_mach (abfd, bfd_arch_m68hc12, bfd_mach_m6812s); break; case EF_M68HC11_GENERIC: bfd_default_set_arch_mach (abfd, bfd_arch_m68hc12, bfd_mach_m6812_default); break; default: return FALSE; } return TRUE; } /* Specific sections: - The .page0 is a data section that is mapped in [0x0000..0x00FF]. Page0 accesses are faster on the M68HC12. - The .vectors is the section that represents the interrupt vectors. */ static const struct bfd_elf_special_section elf32_m68hc12_special_sections[] = { { STRING_COMMA_LEN (".eeprom"), 0, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE }, { STRING_COMMA_LEN (".page0"), 0, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE }, { STRING_COMMA_LEN (".softregs"), 0, SHT_NOBITS, SHF_ALLOC + SHF_WRITE }, { STRING_COMMA_LEN (".vectors"), 0, SHT_PROGBITS, SHF_ALLOC }, { NULL, 0, 0, 0, 0 } }; #define ELF_ARCH bfd_arch_m68hc12 #define ELF_MACHINE_CODE EM_68HC12 #define ELF_MAXPAGESIZE 0x1000 #define TARGET_BIG_SYM bfd_elf32_m68hc12_vec #define TARGET_BIG_NAME "elf32-m68hc12" #define elf_info_to_howto 0 #define elf_info_to_howto_rel m68hc11_info_to_howto_rel #define elf_backend_check_relocs elf32_m68hc11_check_relocs #define elf_backend_relocate_section elf32_m68hc11_relocate_section #define elf_backend_object_p m68hc12_elf_set_mach_from_flags #define elf_backend_final_write_processing 0 #define elf_backend_can_gc_sections 1 #define elf_backend_special_sections elf32_m68hc12_special_sections #define elf_backend_post_process_headers elf32_m68hc11_post_process_headers #define elf_backend_add_symbol_hook elf32_m68hc11_add_symbol_hook #define bfd_elf32_bfd_link_hash_table_create \ m68hc12_elf_bfd_link_hash_table_create #define bfd_elf32_bfd_link_hash_table_free \ m68hc11_elf_bfd_link_hash_table_free #define bfd_elf32_bfd_merge_private_bfd_data \ _bfd_m68hc11_elf_merge_private_bfd_data #define bfd_elf32_bfd_set_private_flags _bfd_m68hc11_elf_set_private_flags #define bfd_elf32_bfd_print_private_bfd_data \ _bfd_m68hc11_elf_print_private_bfd_data #include "elf32-target.h"
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