diff options
Diffstat (limited to 'binutils-2.24/bfd/elf32-m68hc11.c')
| -rw-r--r-- | binutils-2.24/bfd/elf32-m68hc11.c | 1317 |
1 files changed, 0 insertions, 1317 deletions
diff --git a/binutils-2.24/bfd/elf32-m68hc11.c b/binutils-2.24/bfd/elf32-m68hc11.c deleted file mode 100644 index b28579e0..00000000 --- a/binutils-2.24/bfd/elf32-m68hc11.c +++ /dev/null @@ -1,1317 +0,0 @@ -/* Motorola 68HC11-specific support for 32-bit ELF - Copyright 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2010, 2012 - 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 m68hc11_elf_size_one_stub - (struct bfd_hash_entry *gen_entry, void *in_arg); -static bfd_boolean m68hc11_elf_build_one_stub - (struct bfd_hash_entry *gen_entry, void *in_arg); -static struct bfd_link_hash_table* m68hc11_elf_bfd_link_hash_table_create - (bfd* abfd); - -/* Linker relaxation. */ -static bfd_boolean m68hc11_elf_relax_section - (bfd *, asection *, struct bfd_link_info *, bfd_boolean *); -static void m68hc11_elf_relax_delete_bytes - (bfd *, asection *, bfd_vma, int); -static void m68hc11_relax_group - (bfd *, asection *, bfd_byte *, unsigned, unsigned long, unsigned long); -static int compare_reloc (const void *, const void *); - -/* Use REL instead of RELA to save space */ -#define USE_REL 1 - -/* The Motorola 68HC11 microcontroller only addresses 64Kb but we also - support a memory bank switching mechanism similar to 68HC12. - We must handle 8 and 16-bit relocations. The 32-bit relocation - are used for debugging sections (DWARF2) to represent a virtual - address. - 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_M68HC11_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_M68HC11_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_M68HC11_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_M68HC11_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_M68HC11_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_M68HC11_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_M68HC11_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_M68HC11_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_M68HC11_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 */ - 1, /* size (0 = byte, 1 = short, 2 = long) */ - 24, /* bitsize */ - FALSE, /* pc_relative */ - 0, /* bitpos */ - complain_overflow_bitfield, /* complain_on_overflow */ - bfd_elf_generic_reloc, /* special_function */ - "R_M68HC11_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_bitfield, /* complain_on_overflow */ - bfd_elf_generic_reloc, /* special_function */ - "R_M68HC11_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_bitfield, /* complain_on_overflow */ - bfd_elf_generic_reloc, /* special_function */ - "R_M68HC11_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_M68HC11_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_M68HC11_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 68HC11 trampoline stub. */ -static bfd_boolean -m68hc11_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); - if (htab == NULL) - return FALSE; - - 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 += 10; - loc = stub_sec->contents + stub_entry->stub_offset; - - stub_bfd = stub_sec->owner; - - /* Create the trampoline call stub: - - pshb - ldab #%page(symbol) - ldy #%addr(symbol) - jmp __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); - - /* pshb; ldab #%page(sym) */ - bfd_put_8 (stub_bfd, 0x37, loc); - bfd_put_8 (stub_bfd, 0xC6, loc + 1); - bfd_put_8 (stub_bfd, phys_page, loc + 2); - loc += 3; - - /* ldy #%addr(sym) */ - bfd_put_8 (stub_bfd, 0x18, loc); - bfd_put_8 (stub_bfd, 0xCE, loc + 1); - bfd_put_16 (stub_bfd, phys_addr, loc + 2); - loc += 4; - - /* jmp __trampoline */ - bfd_put_8 (stub_bfd, 0x7E, loc); - bfd_put_16 (stub_bfd, htab->pinfo.trampoline_addr, loc + 1); - - return TRUE; -} - -/* As above, but don't actually build the stub. Just bump offset so - we know stub section sizes. */ - -static bfd_boolean -m68hc11_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 += 10; - return TRUE; -} - -/* Create a 68HC11 ELF linker hash table. */ - -static struct bfd_link_hash_table * -m68hc11_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 = m68hc11_elf_size_one_stub; - ret->build_one_stub = m68hc11_elf_build_one_stub; - - return &ret->root.root; -} - - -/* 68HC11 Linker Relaxation. */ - -struct m68hc11_direct_relax -{ - const char *name; - unsigned char code; - unsigned char direct_code; -} m68hc11_direct_relax_table[] = { - { "adca", 0xB9, 0x99 }, - { "adcb", 0xF9, 0xD9 }, - { "adda", 0xBB, 0x9B }, - { "addb", 0xFB, 0xDB }, - { "addd", 0xF3, 0xD3 }, - { "anda", 0xB4, 0x94 }, - { "andb", 0xF4, 0xD4 }, - { "cmpa", 0xB1, 0x91 }, - { "cmpb", 0xF1, 0xD1 }, - { "cpd", 0xB3, 0x93 }, - { "cpxy", 0xBC, 0x9C }, -/* { "cpy", 0xBC, 0x9C }, */ - { "eora", 0xB8, 0x98 }, - { "eorb", 0xF8, 0xD8 }, - { "jsr", 0xBD, 0x9D }, - { "ldaa", 0xB6, 0x96 }, - { "ldab", 0xF6, 0xD6 }, - { "ldd", 0xFC, 0xDC }, - { "lds", 0xBE, 0x9E }, - { "ldxy", 0xFE, 0xDE }, - /* { "ldy", 0xFE, 0xDE },*/ - { "oraa", 0xBA, 0x9A }, - { "orab", 0xFA, 0xDA }, - { "sbca", 0xB2, 0x92 }, - { "sbcb", 0xF2, 0xD2 }, - { "staa", 0xB7, 0x97 }, - { "stab", 0xF7, 0xD7 }, - { "std", 0xFD, 0xDD }, - { "sts", 0xBF, 0x9F }, - { "stxy", 0xFF, 0xDF }, - /* { "sty", 0xFF, 0xDF },*/ - { "suba", 0xB0, 0x90 }, - { "subb", 0xF0, 0xD0 }, - { "subd", 0xB3, 0x93 }, - { 0, 0, 0 } -}; - -static struct m68hc11_direct_relax * -find_relaxable_insn (unsigned char code) -{ - int i; - - for (i = 0; m68hc11_direct_relax_table[i].name; i++) - if (m68hc11_direct_relax_table[i].code == code) - return &m68hc11_direct_relax_table[i]; - - return 0; -} - -static int -compare_reloc (const void *e1, const void *e2) -{ - const Elf_Internal_Rela *i1 = (const Elf_Internal_Rela *) e1; - const Elf_Internal_Rela *i2 = (const Elf_Internal_Rela *) e2; - - if (i1->r_offset == i2->r_offset) - return 0; - else - return i1->r_offset < i2->r_offset ? -1 : 1; -} - -#define M6811_OP_LDX_IMMEDIATE (0xCE) - -static void -m68hc11_relax_group (bfd *abfd, asection *sec, bfd_byte *contents, - unsigned value, unsigned long offset, - unsigned long end_group) -{ - unsigned char code; - unsigned long start_offset; - unsigned long ldx_offset = offset; - unsigned long ldx_size; - int can_delete_ldx; - int relax_ldy = 0; - - /* First instruction of the relax group must be a - LDX #value or LDY #value. If this is not the case, - ignore the relax group. */ - code = bfd_get_8 (abfd, contents + offset); - if (code == 0x18) - { - relax_ldy++; - offset++; - code = bfd_get_8 (abfd, contents + offset); - } - ldx_size = offset - ldx_offset + 3; - offset += 3; - if (code != M6811_OP_LDX_IMMEDIATE || offset >= end_group) - return; - - - /* We can remove the LDX/LDY only when all bset/brclr instructions - of the relax group have been converted to use direct addressing - mode. */ - can_delete_ldx = 1; - while (offset < end_group) - { - unsigned isize; - unsigned new_value; - int bset_use_y; - - bset_use_y = 0; - start_offset = offset; - code = bfd_get_8 (abfd, contents + offset); - if (code == 0x18) - { - bset_use_y++; - offset++; - code = bfd_get_8 (abfd, contents + offset); - } - - /* Check the instruction and translate to use direct addressing mode. */ - switch (code) - { - /* bset */ - case 0x1C: - code = 0x14; - isize = 3; - break; - - /* brclr */ - case 0x1F: - code = 0x13; - isize = 4; - break; - - /* brset */ - case 0x1E: - code = 0x12; - isize = 4; - break; - - /* bclr */ - case 0x1D: - code = 0x15; - isize = 3; - break; - - /* This instruction is not recognized and we are not - at end of the relax group. Ignore and don't remove - the first LDX (we don't know what it is used for...). */ - default: - return; - } - new_value = (unsigned) bfd_get_8 (abfd, contents + offset + 1); - new_value += value; - if ((new_value & 0xff00) == 0 && bset_use_y == relax_ldy) - { - bfd_put_8 (abfd, code, contents + offset); - bfd_put_8 (abfd, new_value, contents + offset + 1); - if (start_offset != offset) - { - m68hc11_elf_relax_delete_bytes (abfd, sec, start_offset, - offset - start_offset); - end_group--; - } - } - else - { - can_delete_ldx = 0; - } - offset = start_offset + isize; - } - if (can_delete_ldx) - { - /* Remove the move instruction (3 or 4 bytes win). */ - m68hc11_elf_relax_delete_bytes (abfd, sec, ldx_offset, ldx_size); - } -} - -/* This function handles relaxing for the 68HC11. - - - and somewhat more difficult to support. */ - -static bfd_boolean -m68hc11_elf_relax_section (bfd *abfd, asection *sec, - struct bfd_link_info *link_info, bfd_boolean *again) -{ - Elf_Internal_Shdr *symtab_hdr; - Elf_Internal_Rela *internal_relocs; - Elf_Internal_Rela *free_relocs = NULL; - Elf_Internal_Rela *irel, *irelend; - bfd_byte *contents = NULL; - bfd_byte *free_contents = NULL; - Elf32_External_Sym *free_extsyms = NULL; - Elf_Internal_Rela *prev_insn_branch = NULL; - Elf_Internal_Rela *prev_insn_group = NULL; - unsigned insn_group_value = 0; - Elf_Internal_Sym *isymbuf = NULL; - - /* Assume nothing changes. */ - *again = FALSE; - - /* We don't have to do anything for a relocatable link, if - this section does not have relocs, or if this is not a - code section. */ - if (link_info->relocatable - || (sec->flags & SEC_RELOC) == 0 - || sec->reloc_count == 0 - || (sec->flags & SEC_CODE) == 0) - return TRUE; - - symtab_hdr = &elf_tdata (abfd)->symtab_hdr; - - /* Get a copy of the native relocations. */ - internal_relocs = (_bfd_elf_link_read_relocs - (abfd, sec, NULL, (Elf_Internal_Rela *) NULL, - link_info->keep_memory)); - if (internal_relocs == NULL) - goto error_return; - if (! link_info->keep_memory) - free_relocs = internal_relocs; - - /* Checking for branch relaxation relies on the relocations to - be sorted on 'r_offset'. This is not guaranteed so we must sort. */ - qsort (internal_relocs, sec->reloc_count, sizeof (Elf_Internal_Rela), - compare_reloc); - - /* Walk through them looking for relaxing opportunities. */ - irelend = internal_relocs + sec->reloc_count; - for (irel = internal_relocs; irel < irelend; irel++) - { - bfd_vma symval; - bfd_vma value; - Elf_Internal_Sym *isym; - asection *sym_sec; - int is_far = 0; - - /* If this isn't something that can be relaxed, then ignore - this reloc. */ - if (ELF32_R_TYPE (irel->r_info) != (int) R_M68HC11_16 - && ELF32_R_TYPE (irel->r_info) != (int) R_M68HC11_RL_JUMP - && ELF32_R_TYPE (irel->r_info) != (int) R_M68HC11_RL_GROUP) - { - prev_insn_branch = 0; - prev_insn_group = 0; - continue; - } - - /* Get the section contents if we haven't done so already. */ - if (contents == NULL) - { - /* Get cached copy if it exists. */ - if (elf_section_data (sec)->this_hdr.contents != NULL) - contents = elf_section_data (sec)->this_hdr.contents; - else - { - /* Go get them off disk. */ - if (!bfd_malloc_and_get_section (abfd, sec, &contents)) - goto error_return; - } - } - - /* Try to eliminate an unconditional 8 bit pc-relative branch - which immediately follows a conditional 8 bit pc-relative - branch around the unconditional branch. - - original: new: - bCC lab1 bCC' lab2 - bra lab2 - lab1: lab1: - - This happens when the bCC can't reach lab2 at assembly time, - but due to other relaxations it can reach at link time. */ - if (ELF32_R_TYPE (irel->r_info) == (int) R_M68HC11_RL_JUMP) - { - Elf_Internal_Rela *nrel; - unsigned char code; - unsigned char roffset; - - prev_insn_branch = 0; - prev_insn_group = 0; - - /* Do nothing if this reloc is the last byte in the section. */ - if (irel->r_offset + 2 >= sec->size) - continue; - - /* See if the next instruction is an unconditional pc-relative - branch, more often than not this test will fail, so we - test it first to speed things up. */ - code = bfd_get_8 (abfd, contents + irel->r_offset + 2); - if (code != 0x7e) - continue; - - /* Also make sure the next relocation applies to the next - instruction and that it's a pc-relative 8 bit branch. */ - nrel = irel + 1; - if (nrel == irelend - || irel->r_offset + 3 != nrel->r_offset - || ELF32_R_TYPE (nrel->r_info) != (int) R_M68HC11_16) - continue; - - /* Make sure our destination immediately follows the - unconditional branch. */ - roffset = bfd_get_8 (abfd, contents + irel->r_offset + 1); - if (roffset != 3) - continue; - - prev_insn_branch = irel; - prev_insn_group = 0; - continue; - } - - /* Read this BFD's symbols if we haven't done so already. */ - if (isymbuf == NULL && symtab_hdr->sh_info != 0) - { - isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; - if (isymbuf == NULL) - isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr, - symtab_hdr->sh_info, 0, - NULL, NULL, NULL); - if (isymbuf == NULL) - goto error_return; - } - - /* Get the value of the symbol referred to by the reloc. */ - if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info) - { - /* A local symbol. */ - isym = isymbuf + ELF32_R_SYM (irel->r_info); - is_far = isym->st_other & STO_M68HC12_FAR; - sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx); - symval = (isym->st_value - + sym_sec->output_section->vma - + sym_sec->output_offset); - } - else - { - unsigned long indx; - struct elf_link_hash_entry *h; - - /* An external symbol. */ - indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info; - h = elf_sym_hashes (abfd)[indx]; - BFD_ASSERT (h != NULL); - if (h->root.type != bfd_link_hash_defined - && h->root.type != bfd_link_hash_defweak) - { - /* This appears to be a reference to an undefined - symbol. Just ignore it--it will be caught by the - regular reloc processing. */ - prev_insn_branch = 0; - prev_insn_group = 0; - continue; - } - - is_far = h->other & STO_M68HC12_FAR; - isym = 0; - sym_sec = h->root.u.def.section; - symval = (h->root.u.def.value - + sym_sec->output_section->vma - + sym_sec->output_offset); - } - - if (ELF32_R_TYPE (irel->r_info) == (int) R_M68HC11_RL_GROUP) - { - prev_insn_branch = 0; - prev_insn_group = 0; - - /* Do nothing if this reloc is the last byte in the section. */ - if (irel->r_offset == sec->size) - continue; - - prev_insn_group = irel; - insn_group_value = isym->st_value; - continue; - } - - /* When we relax some bytes, the size of our section changes. - This affects the layout of next input sections that go in our - output section. When the symbol is part of another section that - will go in the same output section as the current one, it's - final address may now be incorrect (too far). We must let the - linker re-compute all section offsets before processing this - reloc. Code example: - - Initial Final - .sect .text section size = 6 section size = 4 - jmp foo - jmp bar - .sect .text.foo_bar output_offset = 6 output_offset = 4 - foo: rts - bar: rts - - If we process the reloc now, the jmp bar is replaced by a - relative branch to the initial bar address (output_offset 6). */ - if (*again && sym_sec != sec - && sym_sec->output_section == sec->output_section) - { - prev_insn_group = 0; - prev_insn_branch = 0; - continue; - } - - value = symval; - /* Try to turn a far branch to a near branch. */ - if (ELF32_R_TYPE (irel->r_info) == (int) R_M68HC11_16 - && prev_insn_branch) - { - bfd_vma offset; - unsigned char code; - - offset = value - (prev_insn_branch->r_offset - + sec->output_section->vma - + sec->output_offset + 2); - - /* If the offset is still out of -128..+127 range, - leave that far branch unchanged. */ - if ((offset & 0xff80) != 0 && (offset & 0xff80) != 0xff80) - { - prev_insn_branch = 0; - continue; - } - - /* Shrink the branch. */ - code = bfd_get_8 (abfd, contents + prev_insn_branch->r_offset); - if (code == 0x7e) - { - code = 0x20; - bfd_put_8 (abfd, code, contents + prev_insn_branch->r_offset); - bfd_put_8 (abfd, 0xff, - contents + prev_insn_branch->r_offset + 1); - irel->r_offset = prev_insn_branch->r_offset + 1; - irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), - R_M68HC11_PCREL_8); - m68hc11_elf_relax_delete_bytes (abfd, sec, - irel->r_offset + 1, 1); - } - else - { - code ^= 0x1; - bfd_put_8 (abfd, code, contents + prev_insn_branch->r_offset); - bfd_put_8 (abfd, 0xff, - contents + prev_insn_branch->r_offset + 1); - irel->r_offset = prev_insn_branch->r_offset + 1; - irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), - R_M68HC11_PCREL_8); - m68hc11_elf_relax_delete_bytes (abfd, sec, - irel->r_offset + 1, 3); - } - prev_insn_branch = 0; - *again = TRUE; - } - - /* Try to turn a 16 bit address into a 8 bit page0 address. */ - else if (ELF32_R_TYPE (irel->r_info) == (int) R_M68HC11_16 - && (value & 0xff00) == 0) - { - unsigned char code; - unsigned short offset; - struct m68hc11_direct_relax *rinfo; - - prev_insn_branch = 0; - offset = bfd_get_16 (abfd, contents + irel->r_offset); - offset += value; - if ((offset & 0xff00) != 0) - { - prev_insn_group = 0; - continue; - } - - if (prev_insn_group) - { - unsigned long old_sec_size = sec->size; - - /* Note that we've changed the relocation contents, etc. */ - elf_section_data (sec)->relocs = internal_relocs; - free_relocs = NULL; - - elf_section_data (sec)->this_hdr.contents = contents; - free_contents = NULL; - - symtab_hdr->contents = (bfd_byte *) isymbuf; - free_extsyms = NULL; - - m68hc11_relax_group (abfd, sec, contents, offset, - prev_insn_group->r_offset, - insn_group_value); - irel = prev_insn_group; - prev_insn_group = 0; - irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), - R_M68HC11_NONE); - if (sec->size != old_sec_size) - *again = TRUE; - continue; - } - - /* Get the opcode. */ - code = bfd_get_8 (abfd, contents + irel->r_offset - 1); - rinfo = find_relaxable_insn (code); - if (rinfo == 0) - { - prev_insn_group = 0; - continue; - } - - /* Note that we've changed the relocation contents, etc. */ - elf_section_data (sec)->relocs = internal_relocs; - free_relocs = NULL; - - elf_section_data (sec)->this_hdr.contents = contents; - free_contents = NULL; - - symtab_hdr->contents = (bfd_byte *) isymbuf; - free_extsyms = NULL; - - /* Fix the opcode. */ - /* printf ("A relaxable case : 0x%02x (%s)\n", - code, rinfo->name); */ - bfd_put_8 (abfd, rinfo->direct_code, - contents + irel->r_offset - 1); - - /* Delete one byte of data (upper byte of address). */ - m68hc11_elf_relax_delete_bytes (abfd, sec, irel->r_offset, 1); - - /* Fix the relocation's type. */ - irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), - R_M68HC11_8); - - /* That will change things, so, we should relax again. */ - *again = TRUE; - } - else if (ELF32_R_TYPE (irel->r_info) == R_M68HC11_16 && !is_far) - { - unsigned char code; - bfd_vma offset; - - prev_insn_branch = 0; - code = bfd_get_8 (abfd, contents + irel->r_offset - 1); - if (code == 0x7e || code == 0xbd) - { - offset = value - (irel->r_offset - + sec->output_section->vma - + sec->output_offset + 1); - offset += bfd_get_16 (abfd, contents + irel->r_offset); - - /* If the offset is still out of -128..+127 range, - leave that far branch unchanged. */ - if ((offset & 0xff80) == 0 || (offset & 0xff80) == 0xff80) - { - - /* Note that we've changed the relocation contents, etc. */ - elf_section_data (sec)->relocs = internal_relocs; - free_relocs = NULL; - - elf_section_data (sec)->this_hdr.contents = contents; - free_contents = NULL; - - symtab_hdr->contents = (bfd_byte *) isymbuf; - free_extsyms = NULL; - - /* Shrink the branch. */ - code = (code == 0x7e) ? 0x20 : 0x8d; - bfd_put_8 (abfd, code, - contents + irel->r_offset - 1); - bfd_put_8 (abfd, 0xff, - contents + irel->r_offset); - irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), - R_M68HC11_PCREL_8); - m68hc11_elf_relax_delete_bytes (abfd, sec, - irel->r_offset + 1, 1); - /* That will change things, so, we should relax again. */ - *again = TRUE; - } - } - } - prev_insn_branch = 0; - prev_insn_group = 0; - } - - if (free_relocs != NULL) - { - free (free_relocs); - free_relocs = NULL; - } - - if (free_contents != NULL) - { - if (! link_info->keep_memory) - free (free_contents); - else - { - /* Cache the section contents for elf_link_input_bfd. */ - elf_section_data (sec)->this_hdr.contents = contents; - } - free_contents = NULL; - } - - if (free_extsyms != NULL) - { - if (! link_info->keep_memory) - free (free_extsyms); - else - { - /* Cache the symbols for elf_link_input_bfd. */ - symtab_hdr->contents = (unsigned char *) isymbuf; - } - free_extsyms = NULL; - } - - return TRUE; - - error_return: - if (free_relocs != NULL) - free (free_relocs); - if (free_contents != NULL) - free (free_contents); - if (free_extsyms != NULL) - free (free_extsyms); - return FALSE; -} - -/* Delete some bytes from a section while relaxing. */ - -static void -m68hc11_elf_relax_delete_bytes (bfd *abfd, asection *sec, - bfd_vma addr, int count) -{ - Elf_Internal_Shdr *symtab_hdr; - unsigned int sec_shndx; - bfd_byte *contents; - Elf_Internal_Rela *irel, *irelend; - bfd_vma toaddr; - Elf_Internal_Sym *isymbuf, *isym, *isymend; - struct elf_link_hash_entry **sym_hashes; - struct elf_link_hash_entry **end_hashes; - unsigned int symcount; - - symtab_hdr = &elf_tdata (abfd)->symtab_hdr; - isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; - - sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec); - - contents = elf_section_data (sec)->this_hdr.contents; - - toaddr = sec->size; - - irel = elf_section_data (sec)->relocs; - irelend = irel + sec->reloc_count; - - /* Actually delete the bytes. */ - memmove (contents + addr, contents + addr + count, - (size_t) (toaddr - addr - count)); - - sec->size -= count; - - /* Adjust all the relocs. */ - for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++) - { - unsigned char code; - unsigned char offset; - unsigned short raddr; - unsigned long old_offset; - int branch_pos; - - old_offset = irel->r_offset; - - /* See if this reloc was for the bytes we have deleted, in which - case we no longer care about it. Don't delete relocs which - represent addresses, though. */ - if (ELF32_R_TYPE (irel->r_info) != R_M68HC11_RL_JUMP - && irel->r_offset >= addr && irel->r_offset < addr + count) - irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), - R_M68HC11_NONE); - - if (ELF32_R_TYPE (irel->r_info) == R_M68HC11_NONE) - continue; - - /* Get the new reloc address. */ - if ((irel->r_offset > addr - && irel->r_offset < toaddr)) - irel->r_offset -= count; - - /* If this is a PC relative reloc, see if the range it covers - includes the bytes we have deleted. */ - switch (ELF32_R_TYPE (irel->r_info)) - { - default: - break; - - case R_M68HC11_RL_JUMP: - code = bfd_get_8 (abfd, contents + irel->r_offset); - switch (code) - { - /* jsr and jmp instruction are also marked with RL_JUMP - relocs but no adjustment must be made. */ - case 0x7e: - case 0x9d: - case 0xbd: - continue; - - case 0x12: - case 0x13: - branch_pos = 3; - raddr = 4; - - /* Special case when we translate a brclr N,y into brclr *<addr> - In this case, the 0x18 page2 prefix is removed. - The reloc offset is not modified but the instruction - size is reduced by 1. */ - if (old_offset == addr) - raddr++; - break; - - case 0x1e: - case 0x1f: - branch_pos = 3; - raddr = 4; - break; - - case 0x18: - branch_pos = 4; - raddr = 5; - break; - - default: - branch_pos = 1; - raddr = 2; - break; - } - offset = bfd_get_8 (abfd, contents + irel->r_offset + branch_pos); - raddr += old_offset; - raddr += ((unsigned short) offset | ((offset & 0x80) ? 0xff00 : 0)); - if (irel->r_offset < addr && raddr > addr) - { - offset -= count; - bfd_put_8 (abfd, offset, contents + irel->r_offset + branch_pos); - } - else if (irel->r_offset >= addr && raddr <= addr) - { - offset += count; - bfd_put_8 (abfd, offset, contents + irel->r_offset + branch_pos); - } - else - { - /*printf ("Not adjusted 0x%04x [0x%4x 0x%4x]\n", raddr, - irel->r_offset, addr);*/ - } - - break; - } - } - - /* Adjust the local symbols defined in this section. */ - isymend = isymbuf + symtab_hdr->sh_info; - for (isym = isymbuf; isym < isymend; isym++) - { - if (isym->st_shndx == sec_shndx - && isym->st_value > addr - && isym->st_value <= toaddr) - isym->st_value -= count; - } - - /* Now adjust the global symbols defined in this section. */ - symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym) - - symtab_hdr->sh_info); - sym_hashes = elf_sym_hashes (abfd); - end_hashes = sym_hashes + symcount; - for (; sym_hashes < end_hashes; sym_hashes++) - { - struct elf_link_hash_entry *sym_hash = *sym_hashes; - if ((sym_hash->root.type == bfd_link_hash_defined - || sym_hash->root.type == bfd_link_hash_defweak) - && sym_hash->root.u.def.section == sec - && sym_hash->root.u.def.value > addr - && sym_hash->root.u.def.value <= toaddr) - { - sym_hash->root.u.def.value -= count; - } - } -} - -/* Specific sections: - - The .page0 is a data section that is mapped in [0x0000..0x00FF]. - Page0 accesses are faster on the M68HC11. Soft registers used by GCC-m6811 - are located in .page0. - - The .vectors is the section that represents the interrupt - vectors. */ -static const struct bfd_elf_special_section elf32_m68hc11_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_m68hc11 -#define ELF_TARGET_ID M68HC11_ELF_DATA -#define ELF_MACHINE_CODE EM_68HC11 -#define ELF_MAXPAGESIZE 0x1000 - -#define TARGET_BIG_SYM bfd_elf32_m68hc11_vec -#define TARGET_BIG_NAME "elf32-m68hc11" - -#define elf_info_to_howto 0 -#define elf_info_to_howto_rel m68hc11_info_to_howto_rel -#define bfd_elf32_bfd_relax_section m68hc11_elf_relax_section -#define elf_backend_check_relocs elf32_m68hc11_check_relocs -#define elf_backend_relocate_section elf32_m68hc11_relocate_section -#define elf_backend_add_symbol_hook elf32_m68hc11_add_symbol_hook -#define elf_backend_object_p 0 -#define elf_backend_final_write_processing 0 -#define elf_backend_can_gc_sections 1 -#define elf_backend_special_sections elf32_m68hc11_special_sections -#define elf_backend_merge_symbol_attribute elf32_m68hc11_merge_symbol_attribute - -#define bfd_elf32_bfd_link_hash_table_create \ - m68hc11_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" |